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  • Life and Medical Sciences  (30,791)
  • Chemical Engineering  (17,982)
  • Roggen
  • 1
    Keywords: Biomass conversion ; Biotechnology ; Chemical Engineering ; Chemistry industry ; Industrial Chemistry ; Kent ; Riegel ; biochemical engineering
    Description / Table of Contents: Substantially revising and updating the classic reference in the field, this handbook offers a valuable overview and myriad details on current chemical processes, products, and practices. No other source offers as much data on the chemistry, engineering, economics, and infrastructure of the industry. The Handbook serves a spectrum of individuals, from those who are directly involved in the chemical industry to others in related industries and activities. It provides not only the underlying science and technology for important industry sectors, but also broad coverage of critical supporting topics. Industrial processes and products can be much enhanced through observing the tenets and applying the methodologies found in chapters on Green Engineering and Chemistry (specifically, biomass conversion), Practical Catalysis, and Environmental Measurements; as well as expanded treatment of Safety, chemistry plant security, and Emergency Preparedness. Understanding these factors allows them to be part of the total process and helps achieve optimum results in, for example, process development, review, and modification. Important topics in the energy field, namely nuclear, coal, natural gas, and petroleum, are covered in individual chapters. Other new chapters include energy conversion, energy storage, emerging nanoscience and technology. Updated sections include more material on biomass conversion, as well as three chapters covering biotechnology topics, namely, Industrial Biotechnology, Industrial Enzymes, and Industrial Production of Therapeutic Proteins.
    Pages: Online-Ressource (XIV, 1562 pages)
    ISBN: 9780387278438
    Language: English
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  • 2
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2023-06-23
    Description: The aim of this second Eng Special Issue is to collect experimental and theoretical re-search relating to engineering science and technology. The general topics of Eng are as follows: electrical, electronic and information engineering; chemical and materials engineering; energy engineering; mechanical and automotive engineering; industrial and manufacturing engineering; civil and structural engineering; aerospace engineering; biomedical engineering; geotechnical engineering and engineering geology; and ocean and environmental engineering. Therefore, the following editorial is a selection of representative works of these topics.
    Keywords: &nbsp ; Environment Management ; Environmental Engineering ; Chemical Engineering ; Materials Engineering&nbsp ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues::TBX History of engineering & technology
    Language: English
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  • 3
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    De Gruyter | De Gruyter
    Publication Date: 2024-04-05
    Description: The essential principles of green chemistry are the use of renewable raw materials, highly efficient catalysts and green solvents linked with energy efficiency and process optimization in real-time. Experts from different fields show, how to examine all levels from the molecular elementary steps up to the design and operation of an entire plant for developing novel and efficient production processes.
    Keywords: Process Engineering ; Chemical Engineering ; Technical Chemistry ; thema EDItEUR::P Mathematics and Science::PN Chemistry ; thema EDItEUR::R Earth Sciences, Geography, Environment, Planning::RN The environment ; thema EDItEUR::R Earth Sciences, Geography, Environment, Planning::RN The environment::RNU Sustainability ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TD Industrial chemistry and manufacturing technologies::TDC Industrial chemistry and chemical engineering ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials::TGM Materials science ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TQ Environmental science, engineering and technology
    Language: English
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  • 4
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    In:  Vereinigten Friedrichs-Universität Halle-Wittenberg, Halle.
    Publication Date: 1928
    Description: Ertragsrelevante Korrelationen bei Winterweizen und -gerste mit der Temperatur, bei allen übrigen Kulturen war Niederschlag entscheidend KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Saalkreis, Kreis Bitterfeld, Kreis Delitzsch, Kreis Wittenberg, südl. Teil Kreis Köthen ; 1900-26 ; Kartoffeln ; Boden ; Ertrag ; Getreide ; Hafer ; Niederschlag ; Rangordnungsmethode ; Roggen ; Temperatur ; Weizen ; Witterung ; Hackfrüchte
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  • 5
    Publication Date: 1984
    Description: Rekonstruktion der Klimadaten anhand historischer Aufzeichnungen über phänologische Daten (Tagebücher), Zehntzahlungen und Lohnzahlungne an Tagelöhner von landwirtschaftlichen Erträgen KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Scheiz ; 1525-1860 ; Ertrag ; Klima ; Roggen ; Temperatur
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  • 6
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    In:  Hannov. land- und forstw. Zeitg.:93-95
    Publication Date: 1927
    Description: Beschreibung der Witterungsverläufe der Winter und Empfehlungen für die Bodenbearbeitung und Bestandesführung von Winterkulturen KATASTER-BESCHREIBUNG: Einfluss der Witterung (Niederschlag und Temperatur) auf den Ertrag KATASTER-DETAIL: Delta Nied (Vorjahr) ++, dann Ertrag -; Delta Nied (Winter) +, dann Bodenfeuchte + und somit Ertrag +; Delta T (November) -, dann Ertrag -; Delta T (Winter) +, dann Ertrag +; Delta T (Frühling) +, dann Ertrag -;
    Keywords: Niedersachsen ; 1924-26 ; Insekten ; Ertrag ; Getreide ; Landwirtschaft ; Niederschlag ; Pflanzenschädling ; Roggen ; Weizen ; Düngung ; Gerste
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  • 7
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    In:  Georgine, Königsberg 104 (10):65-66
    Publication Date: 1928
    Description: Einluß von Temperatur und Niederschlag in bestimmten Zeiträumen auf das Tausendkorngewicht (TKG) KATASTER-BESCHREIBUNG: Zusammenhang Niederschlag, Temperatur und Sonnenscheinstunden zum Tausendkorngewicht (Ertrag) von Weizen, Roggen und Gerste KATASTER-DETAIL: Delta T (0,48-1,9°C während der Vegetationszeit April-August über dem Mittel der Jahre 1921-26) und Delta Nied (-25- +52% vom Schossen bis zur Ernte über dem Mittel der Jahre 1921-26), dann höhreres TKG um 11,6-21,4%
    Keywords: Pommern ; 1921-1926 ; Ertrag ; Getreide ; Niederschlag ; Roggen ; Temperatur ; Weizen ; Sonnenscheindauer ; Gerste
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  • 8
    Publication Date: 1925
    Description: Beobachtungen zum Befall von Winterroggen durch Puccinia coronifera Kleb. und Überlegungen für mögliche Gründe KATASTER-BESCHREIBUNG: Aufgrund der starken Trockenheit verliert der Roggen seine Immunität gegenüber Puccinia coronifera KATASTER-DETAIL: Delta Nied (Herbst) -, dann Befall von Puccinia coronifera +
    Keywords: Kamennaja Step, Russland ; 1924 ; Pflanzenkrankheit ; Roggen ; Trockenheit
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  • 9
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    In:  Die kranke Pflanze 2, p. 117-119
    Publication Date: 1925
    Description: Allgemeine Beobachtungen zum Auftreten und zur Wanderung des Getreidelaufkäfers und dessen Larven; Nennung von Möglichkeiten zur Bekämpfung des Insekts KATASTER-BESCHREIBUNG: Abhängigkeit der Stärke des Auftretens von der Temperatur KATASTER-DETAIL: Delta T+, dann Auftreten der Larven +
    Keywords: Sachsen ; Beginn 20. Jahrhundert ; Insekten ; Boden ; Ertrag ; Getreide ; Landwirtschaft ; Pflanzenschädling ; Roggen ; Temperatur ; Weizen
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  • 10
    Publication Date: 1909
    Description: Zusammentragung der Erkenntnisse des Jahres 1909 im Gebiet der Agrarchemie KATASTER-BESCHREIBUNG: Erinfluss der Witterung (Niederschlag, Temperatur, Sonnenscheindauer) auf den Ertrag KATASTER-DETAIL: Delta Nied (Vegetationszeit) +, dann Erträge (Winter- und Sommergetreide)+; Delta T (Vegetationszeit) -, , dann Erträge (Winter- und Sommergetreide)+; Delta Nied (September und Juni) +, dann Erträge (Wintergetreide)+; Delta T (September und Juni) -, , dann Erträge (Wintergetreide)+; Delta Nied (vorausgegangene Regenfälle) +, dann Erträge (Sommergetreide) +; Delta Nied (September, Mai, Juni) beeinflusst Erträge von Hafer und Weizen; Delta Nied (September, Oktober, Juni) beeinflusst Erträge von Gerste; Delta Nied (Vegetationsperiode) beeinflusst direkt Erträge von Rüben Delta T (Vegetationsperiode) beeinflusst indirekt Erträge von Rüben; Delta Sonn (Juli, August, September) -, dann Qualität der Rüben +; Bodenfeuchte +, dann Wasserverbrauch (Hafer) +; Bodenfeuchte +, dann Wurzelentwicklung (Hafer)+; Bodenfeuchte +, dann Länge und Stärke der Halme, Länge der Internodien sowie Rispengewicht (Hafer)+; Ernte-, dann relativer Wasserverbrauch (Rüben, Roggen, Gerste, Lupinen, Kartoffeln, Sommergerste)+
    Keywords: Charkow, Ukraine ; 1893-1902 ; Zuckerrüben ; Kartoffeln ; Ertrag ; Getreide ; Hafer ; Niederschlag ; Roggen ; Temperatur ; Weizen ; Witterung ; Gerste
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  • 11
    Publication Date: 1952
    Description: Untersuchungen über zusammenhänge zwischen Düngung und Ertrag, Witterung und Ertragsbildung, sowie Witterung und Düngewirkung bei den Hauptfrüchten (Winterroggen, Hafer, Kartoffeln) KATASTER-BESCHREIBUNG: Zusammenhang zwischen Witterung (Temperatur und Niederschlag) und der Ertragsbildung sowie zischen der Witterung und der Wirkung der Düngungsarten (mineralisch und organisch) KATASTER-DETAIL: Delta T (März) + und Delta Nied (März) -, dann Trockenschäden an Winterroggen +; kritische Periode (Winterroggen): Wasserversorgung gegen Ende der Blüte; Delta Nied (1. Junihälfte), dann Erträge (Winterroggen) +; Delta T (März) +, dann Schädigung (Hafer) +; Delta T (März) - und Delta Nied (März) +, dann Erträge (Hafer) +; Delta Nied (Ende der Blüte) + und Delta T (Ende August) +, dann Erträge (Kartoffeln) +; Delta Nied (kurz vor dem Ähren- bzw. Rispenschieben) -, dann relative Leistung der organischen Düngung (Winterroggen und Hafer) +; Delta Nied (kurz vor dem Ähren- bzw. Rispenschieben) +, dann Leistung der mineralischen Düngung (Winterroggen und Hafer) +; Delta Nied + (steigend), dann Wirkung mineralischer Düngung +; Delta Nied (Juni) -, dann Wirkung organischer Düngung +,
    Keywords: Thyrow, Brandenburg ; 1936-1952 ; Kartoffeln ; Ertrag ; Hafer ; Roggen ; Witterung ; Düngung
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  • 12
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    In:  Wirtschaft und Statistik , 15, 662, Verlag für Sozialpolitik
    Publication Date: 1935
    Description: Entwicklung der Erträge von Winterroggen, Winterweizen, Sommergerste, Hafer, Kartoffeln, Zuckerrüben, Wiesenheu, Kleeheu in den jeweiligen deutschen Anbaugebieten KATASTER-BESCHREIBUNG: kein Bezug zum Klima KATASTER-DETAIL:
    Keywords: Deutschland ; 1878-1935 ; Zuckerrüben ; Kartoffeln ; Ertrag ; Hafer ; Roggen ; Weizen ; Gerste
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  • 13
    Publication Date: 1959
    Description: Beschreibung der Schwankungen des Beginns, des Endes sowie die Gesamtschwankung der Vegetationsperiode unter Verwendung langjähriger Reihen, phänologische Ereignisse wie Schneeglöckchenblüte, Blüte, Ernte und Länge der Reifezeit von Roggen, Erfassung des Zusammenhangs zwischen Niederschlägen, Wärmeanspruch und der Phänologie KATASTER-BESCHREIBUNG: Bestimmung der Winterroggenblüte mithilfe der Blunckschen Hyperbel (Temperatursummenregel) für Wernigerode und Dölitz (Sachsen) Bestimmung der Niederschläge (y) im Juli auf die Reifezeit von Roggen (ertragswirksamste Phase) KATASTER-DETAIL: Wernigerode (T=4,0+138,0/t) mit T mittlere Temp. während der Entwicklungsdauer in Tagen t, Blühbeginn Roggen zwischen dem 34. und 64. Tag, Dölitz (T=4,0+347,6/t), Blühbeginn Roggen zwischen dem 38. und 52. Tag, y (in mm)= -353,1+9,3Xt
    Keywords: Mitteldeutschland ; 1854-1953 ; Ertrag ; Niederschlag ; Phänologie ; Roggen ; Temperatur
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  • 14
    Publication Date: 1929
    Description: vgl. Neustädt KATASTER-BESCHREIBUNG: Zusammenhang Witterungsfaktoren in wachstumsrelevanten Zeitspannen mit dem Ertrag verschiedener Kulturen KATASTER-DETAIL: Delta Nied (Oktober bis März) -, dann Erträge (Roggen) +; Delta Nied (Januar) -, dann Erträge (Roggen) ++; Delta Nied (Februar) +, dann Erträge (Roggen) +; Delta Nied (Mai) +, dann Erträge (Roggen) +; Delta Nied (Mai) 〉 1,5x Mittel, dann Erträge -; Delta Sonn (Mai, im Bezirk Köthen) +, dann Erträge (Roggen) -; Delta Nied (Januar, März, April) -, dann Erträge (Sommergerste) +; Delta Nied (Februar, Mai bis Ernte) +, dann Erträge (Sommergerste) +; Delta Nied (Mai) +, dann Erträge (Sommergerste) ++; (Informationen zu den weiteren landwirtschaftlicher Kulturpflanzen: siehe Artikel)
    Keywords: Mitteldeutschland ; 1900-1926 ; Kartoffeln ; Ertrag ; Niederschlag ; Roggen ; Temperatur ; Witterung ; Hackfrüchte
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  • 15
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    In:  Meterolog. Zeitschrift, Braunschweig, 41: 170-173
    Publication Date: 1924
    Description: Beziehung zwischen Niederschlag und Ertrag mithilfe der Korrelationsmethode KATASTER-BESCHREIBUNG: Berechnung von Korrelationswerten deuten auf starken Einfluss des Juniniederschlags hin, durch Berechnung der Abweichung vom 10jährigen Mittel werden Beziehungen einzelner Monate, bzw. 2 monatiger Niederschlagssummen zum Ertrag für Winterweizen, Winterroggen, Hafer, Kartoffeln, Sommerweizen und Sommerroggen sichtbar KATASTER-DETAIL: Delta Nied+ (Januar), dann Winterweizen +; Delta Nied- (〈 20mm) im März, dann Ertrag von Winterweizen, Winterroggen, Sommerroggen und Sommerweizen +; Delta Nied+ (〉60mm) im Juli, dann Ertrag Winterweizen++; Delta Nied- (〈40mm) im Juni, dann Kartoffel +, aber Hafer-; Delta Nied+ (〉130mm) im Juni, dann Kartoffel -, aber Hafer+;
    Keywords: Niederbayern ; 1884-1922 ; Kartoffeln ; Ertrag ; Hafer ; Korrelationsmethode ; Niederschlag ; Roggen ; Weizen
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  • 16
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    In:  Journal für Landwirtschaft, 54: 316-342
    Publication Date: 1905
    Description: Durch Gewichtsveränderungen, Bestimmung der Verdunstung, der Drainage und des Ertrages wird der Wasserverbrauch der einzelnen Kulturen in einzelnen Vegetationszeiträumen ermittelt KATASTER-BESCHREIBUNG: Beziehung Wasserverbrauch, Pflanzenart und N-Düngung auf Lehm- und Sandboden, jedoch ohne Berücksichtigung der Temperatur KATASTER-DETAIL: (Temperatur 1904-1905): Weizen: 333g Wasser pro 1g Roggen: 375g Wasser pro 1g Kartoffeln: 66,3g pro g frische Kartoffeln
    Keywords: Labor ; 1904-05 ; Kartoffeln ; Ertrag ; Niederschlag ; Roggen ; Verdunstung ; Weizen ; Düngung
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  • 17
    Publication Date: 1978
    Description: Berechnung linearer Regressionen zwischen Abweichungen der Temperatur, Niederschlag, Sonnenschein und Vegetationsbeginn vom Trendertrag KATASTER-BESCHREIBUNG: Zusammenhang zwischen berechneter Vegetationslänge und den Ertragsabweichungen vom Trend für definierte Regionen KATASTER-DETAIL: Ertragsabweichung vom Trend (N) berechnete Vegetationslänge (U) N = 0,384 * U -11,5
    Keywords: Ostdeutschland ; 1957-75 ; Ertrag ; Niederschlag ; Roggen ; Temperatur ; Weizen
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  • 18
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    In:  Diss., Landwirt.-gärtnerische. Fak. Berlin
    Publication Date: 1952
    Description: Auswirkung der Witterung in einzelnen Monaten auf Ernteerträge durch Einteilung in Ernteklassen; Ertragsaufzeichenungen des Versuchsbetriebes Tyrow, Ertrag, Witterung, Niederschlag, Temperatur KATASTER-BESCHREIBUNG: Roggen - Wasserversorgung zur Zeit der Blüte (1.Hälfte Juni) ergibt auf dem Sandboden Ertragsrückgänge Kartoffeln- Juli stetig ansteigende Temperaturen und und ansteigenden Niederschlägen führt zu Ertragssteigerungen KATASTER-DETAIL: Delta T+ (Juli) und Delta Nied+, dann Ertragssteigerungen bei Kartoffeln
    Keywords: Brandenburg ; 1937-1944, 1947-1951 ; Kartoffeln ; Hafer ; Roggen
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  • 19
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    In:  Landwirtschaftl. Jahrbuch 68:642-686
    Publication Date: 1942
    Description: Ableitung kritischer Faktoren (Temperaturoptima und Wasserversorgung) in einzelnen Wachstumsstadien KATASTER-BESCHREIBUNG: Zusammenhang zwischen Temperaturänderung während der Blüte von Weizen und dem Ertrag KATASTER-DETAIL: Delta T + und -: Tmit von 14-15°C, Änderung um +1 K auf 16°C, aber auch Rückgang um 2K auf 13°C, dann Rückgang des Ertrages
    Keywords: Kölner Bucht ; 1907-37 ; Boden ; Ertrag ; Korrelationsmethode ; Niederschlag ; Roggen ; Temperatur ; Weizen ; Witterung ; Düngung ; Hackfrüchte
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  • 20
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    In:  Buch von: Höhne, E., (1919): Landwirtschaftlich-klimatologische Untersuchung des Gebietes zwiwchen mittlerer Saale und Pleiße und Einteilung in klimatische Unterbezirke auf Grund der Beziehungen zwischen Witterungsfaktoren und Ernteerträgen
    Publication Date: 1929
    Description: Untersuchung zur Beziehung zwischen Witterungsfaktoren und Ernteerträgen in verschiedenen Untersuchungsgebieten mittels Rangordnungsdifferenzen. Betrachtet wurden die Erträge von Roggen, Winterweizen, Sommergerste, Hafer, Sommerweizen, Zuckerrübe, Kartoffel und Erbse KATASTER-BESCHREIBUNG: Einfluss der Witterung (Niederschlag, Temperatur, Sonnenschein) auf die Erträge KATASTER-DETAIL: Delta Nied (Oktober bis März) -, dann Erträge (Roggen) +; Delta Nied (Januar) -, dann Erträge (Roggen) ++; Delta Nied (Februar) +, dann Erträge (Roggen) +; Delta Nied (Mai) +, dann Erträge (Roggen) +; Delta Nied (Mai) 〉 1,5x Mittel, dann Erträge -; Delta Sonn (Mai, im Bezirk Köthen) +, dann Erträge (Roggen) -; Delta Nied (Januar, März, April) -, dann Erträge (Sommergerste) +; Delta Nied (Februar, Mai bis Ernte) +, dann Erträge (Sommergerste) +; Delta Nied (Mai) +, dann Erträge (Sommergerste) ++; Köthen (Nied 15-30mm im März), (Delta T- im April/Juni, besonders im Mai), dann Winterweizenertrag++ (weitere Informationen zu den weiteren landwirtschaftlicher Kulturpflanzen und Regionen: siehe Artikel)
    Keywords: Sachsen und Thüringen ; 1899-1926 ; Boden ; Ertrag ; Getreide ; Klima ; Korrelationsmethode ; Landwirtschaft ; Niederschlag ; Roggen ; Temperatur ; Weizen ; Globalstrahlung ; Hackfrüchte
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  • 21
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    In:  Deut. Landwirtschaflt. Presse 42: 420-421
    Publication Date: 1915
    Description: Korrelation der Sommer- und Winterniederschläge (Oktober-März) mit den Erträgen von Sommer- und Winterweizen, Roggen, Hafer, Gerste, Zuckerrüben und Kartoffeln, Winterniederschläge sind entscheidend für die Erträge, aber ertragsrelevanter sind die Sommerniederschläge und hier nicht in der Häufigkei, sondern der Menge im Zusammenspiel mit Temperatur, Sonnenscheindauer etc. KATASTER-BESCHREIBUNG: Beziehung zwischen der Niederschlagshöhe und dem Ertrag verschiedener Kulturen, getrennt für Winter- und Sommerniederschläge als Grafiken KATASTER-DETAIL:
    Keywords: Schlesien und Sachsen-Anhalt ; 1888-1907 ; Zuckerrüben ; Kartoffeln ; Ertrag ; Getreide ; Korrelationsmethode ; Niederschlag ; Roggen ; Weizen
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  • 22
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    In:  Zeitschrift für Pflanzenernährung, Düngung, Bodenkunde 8:425-458
    Publication Date: 1929
    Description: Auswirkungen über gestaffelte Stickstoff-Düngung auf den Ertrag von Weizen, Gerste, Roggen und Hafer. Angaben zu Temperatur und Niederschlag während der Vegetationszeit, Hinweise auf Zusammenhang zwischen Witterung und Ertrag und Wirkung der Düngung, Bedeutung eines längeren Zeitraums für die Beobachtungen KATASTER-BESCHREIBUNG: Einfluss von Niederschlag und Temperatur auf den Ertrag von Hafer KATASTER-DETAIL: Delta Nied (nach der Saat) +, dann t(Aufgang) - (später); Delta Nied (Ende des Wachstum) -, dann Erträge (Hafer) -; Delta T (20 Tage nach dem Aufgang) +: T 〉 11°C, dann Ertrag (Hafer) -;
    Keywords: Bayern ; 1924-28 ; Ertrag ; Getreide ; Hafer ; Niederschlag ; Roggen ; Temperatur ; Weizen ; Düngung ; Gerste
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  • 23
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    In:  In U. S. Department of Agriculture, (ed.) A Selected and Annotated Bibliography, Washington.
    Publication Date: 1931
    Description: Kompendium zum Zusammenhang Wetter und Pflanzen, landwirtschaftlich, gärtnerische und forstwirtschaftliche Kulturen, Schädlinge und Gesundheit, 2324 Literaturstellen mit kurzer Zusammenfassung KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: weltweit ; 1650-1930 ; Insekten ; Umweltmedizin ; Zuckerrüben ; Kartoffeln ; Anbautermine ; Infektionskrankheiten ; Boden ; Botanik ; Buche ; Eiche ; Ertrag ; Fichte ; Forst ; Getreide ; Hafer ; Kiefer ; Klima ; Korrelationsmethode ; Landwirtschaft ; Mais ; Niederschlag ; Pflanzenkrankheit ; Pflanzenschädling ; Phänologie ; Rangordnungsmethode ; Roggen ; Roterle ; Temperatur ; Trockenheit ; Vegetationsperiode ; Verdunstung ; Wachstum ; Waldbrand ; Waldwachstum ; Wassermangel ; Weizen ; Wetterbeobachtung ; Wind ; Witterung ; Witterungsextreme ; Düngung ; Globalstrahlung ; Hackfrüchte ; Erbsen ; Wein
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  • 24
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    In:  Deutsche Landwirtschaftliche Presse 31:494-495. Ausgabe vom 13. Juli 1904
    Publication Date: 1904
    Description: Ursachen für die Auswinterung von Getreide im Jahr 1901, Zusammenhang von Temperatur und Feuchtigkeit (Niederschlag) ist entscheidend KATASTER-BESCHREIBUNG: Einfluss der Witterung (Temperatur und Niederschlag) auf den Prozess der Auswinterung KATASTER-DETAIL: Delta T (Winter)+ und dann Delta Nied (Winter) +: Schneedecke 〉 15-20cm auf ungefrorenem Boden über ca. 3 Monate, dann Auswinterung (Ausfaulen) +; Entwicklung der Pflanze +, dann Auswinterung (Erstickungsgefahr) +; Boden feucht bzw. nass und häufiges gefrieren und wieder auftauen, dann Auswinterung (Auffrieren, Aufziehen) +; Delta T -: T 〈 -25 bis 30 °C, dann erfrieren des Roggens; Anzahl Kälteperioden im Winter +, dann Auswinterung +; Delta Nied (1. Hälfte des Vegetationsjahres) - und dann Delta Sonn +, dann Auswinterung +
    Keywords: Preußen, Norddeutschland ; 1900-1903 ; Boden ; Ertrag ; Forst ; Getreide ; Landwirtschaft ; Niederschlag ; Roggen ; Verdunstung ; Wassermangel ; Witterungsextreme ; Hackfrüchte
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  • 25
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    In:  Arch. Ver. Freunde der Naturgesch. Mecklenburg 67 (Abt. 1):55-129.
    Publication Date: 1913
    Description: Zusammenhang Witterung und Phänologie in Regionen Norddeutschlands, sehr schöne Karten KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Niederlande und Norddeutschland ; 1890-1910 ; Klima ; Niederschlag ; Phänologie ; Roggen
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  • 26
    Publication Date: 1910
    Description: Einfluss der Sonnenscheindauer und des Niederschlags auf Winterweizen, Winterroggen, Hafer, Gerste und Kartoffeln, Einteilung in Entwicklungseinheiten und Wettereinheiten und daraus Ableitung des Ertrages KATASTER-BESCHREIBUNG: Vereinfachter Ausdruck von Verhältnis Sonnenscheindauer und Regenmenge; Ertrag der Feldpflanzen wird erfahrungsgemäß immer von dem im Minimum vorhandenen Wetterelement bestimmt, daher bei Überschuss einer Einheit Abzug bzw. Gutschrift bei der anderen Einheit; Sommerfrüchten bleibt 10% Winterfrüchten 20% des Winterniederschlages; KATASTER-DETAIL: 1. Einteilen der Witterungsfaktoren in Einheiten: Sonnescheineinheit, Regen~,Wetter~; 2. 20 Sonnenstunden = 1 s (Sonneneinheit) 10 mm Niederschlag = 1 r (Regeneinheit) 1 s + 1 r = 1 Wettereinheit 3. Abzug oder Gutschrift für Überschuss an Einheiten je nach Beziehung untereinander; 4. Ertrag auf 1ha : Anzahl Wettereinheiten = Ertrag auf eine Wettereinheit[dz]
    Keywords: Chemnitz ; 1895-1904 ; Kartoffeln ; Ertrag ; Hafer ; Niederschlag ; Roggen ; Weizen ; Sonnenscheindauer
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  • 27
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    In:  Deut. Landwirtschafts-Gesellschaft, Berlin, Heft 161:35
    Publication Date: 1910
    Description: Pflanzenphänologische Beobachtungen und ihre praktische Verwendung. Der Eintritt von Blüte und Ernte des Winterroggens im Großherzogtum Hessen. Das pflanzenphänologische Verhalten der Jahre 1909 und 1908. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Hessen ; 1880-1908 ; Landwirtschaft ; Phänologie ; Roggen
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  • 28
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    In:  Deut. Landwirtschaflt. Presse 55:94-95.
    Publication Date: 1928
    Description: Übersicht über die Literatur zum Einfluss des Wetters auf die Kulturpflanzen KATASTER-BESCHREIBUNG: Milder und trockener Winter wirkt positiv auf die Weizenerträge, kalter und niederschlagsreicher Winter eher negativ, Betrachung für Norddeutschland KATASTER-DETAIL:
    Keywords: Deutschland ; 1900-1926 ; Kartoffeln ; Ertrag ; Getreide ; Hafer ; Landwirtschaft ; Niederschlag ; Roggen ; Temperatur ; Trockenheit ; Witterung ; Gerste
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  • 29
    Publication Date: 2011
    Description: Rekonstruktion der Temperatur (März-Juli) anhand historischer Aufzeichnungen über Feldarbeiten (Erntebeginn von Roggen), Rückschlüsse auf Blühbeginn von Roggen KATASTER-BESCHREIBUNG: Zusammenhang zwischen der kumulativen Temperaturanomalie der Monate März bis Juli (Vergleich zur Mittleren Temperatur des 20. Jahrhunderts) und dem Zeitpunkt der Ernte KATASTER-DETAIL: Delta T (März bis Juli) +: T (Monat) 〈 Mittel des 20. Jahrhunderts, dann frühere Ernte +; Delta T (März bis Juli) -: T (Monat) 〉 Mittel des 20. Jahrhunderts, dann spätere Ernte +
    Keywords: Süddeutschland, Schweiz ; 1454-1970 ; Klima ; Roggen ; Temperatur
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  • 30
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    In:  Culegere del lucrari ale Institutului meteorologic pe Anul 1962 (Bukarest):415-425.
    Publication Date: 1964
    Description: Ertragszahlen aus 80-jährigen Versuchen mit Winterroggen an der Uni Halle werden mit Witterungsabläufen verglichen, 7jährige Mittel und Vergleich zu unterschiedlichen phänologischen Phasen KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Halle ; 1880-1960 ; Ertrag ; Korrelationsmethode ; Niederschlag ; Phänologie ; Roggen ; Temperatur
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  • 31
    Publication Date: 1926
    Description: Diskussion über die Geschichte, Entwicklung und Anwendbarkeit von phänologischen Studien, Zusammenfassung, teilweise Details über den Einfluss der Sorte, der Düngung, des Bodens, Klimas, Längengrades, Krankheiten und anderer Faktoren auf die Erträge von Winterroggen in Bayern KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Bayern ; 1917-1923 ; Botanik ; Ertrag ; Klima ; Niederschlag ; Pflanzenschädling ; Phänologie ; Roggen ; Düngung ; Frost
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  • 32
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    In:  Fühling´s Landwirtschaftliche Zeitung Jg. 48, 1899, S. 324-330 u. 361-366. Zugl. als Separatdruck Verlag Hugo Voigt Leipzig 1899.
    Publication Date: 1899
    Description: Einfluß von Witterung auf Eerträge von Feldfrüchten KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Deutschland, teilw. einzelne Regionen (z.B. Halle) ; letzten100 Jahre ; Zuckerrüben ; Kartoffeln ; Getreide ; Niederschlag ; Pflanzenkrankheit ; Roggen ; Temperatur ; Weizen ; Witterung
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  • 33
    Publication Date: 1930
    Description: Abhängigkeit der Erträge von Erbsen, Kartoffeln, Winterweizen und Hafer und Winterroggen von Witterungseinflüssen mithilfe der Rangordnungs- und Korrelationsmethode KATASTER-BESCHREIBUNG: Mithilfe der Abweichungen von Rangordnungszahlen für die Temperatur und den Niederschlag für einzelne, bzw. 2 Monatsabschnitte, Summen für Zeiträume und Beziehungen zun Ertrag erfolgt die Bestimmung von kritischen Zeiten KATASTER-DETAIL: Delta T (März, April) + und Delta Nied (März, April) -, dann Erträge (Erbsen) +; Delta T (Mai, Juni) - und Delta Nied (Mai, Juni) +, dann Erträge (Erbsen) +; Delta T (Oktober - vorhergehendes Jahr) +, dann Erträge (Kartoffeln) +; Delta T (März)+, dann Erträge (Winterweizen) +; Delta T (Mai, Juni) -, dann Erträge (Winterweizen) +; Delta Nied (Januar bis März) -, dann Erträge (Hafer) +; Delta Nied (Januar bis März) -, dann Erträge (Winterroggen) +;
    Keywords: Deutschland ; 1930 ; Kartoffeln ; Ertrag ; Getreide ; Hafer ; Korrelationsmethode ; Niederschlag ; Rangordnungsmethode ; Roggen ; Temperatur ; Weizen ; Witterung ; Erbsen
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  • 34
    Publication Date: 1955
    Description: Untersuchung über die Beziehung zwischen Ertragsklassen und Klassen der Witterungsfaktoren nach Rangkorrelationsmethode für eine kleine abgeschlossene Region. Untersucht wurden folgende Kulturpflanzen: Winterweizen, Winterroggen, Wintergerste, Zuckerrüben, Spätkartoffeln. KATASTER-BESCHREIBUNG: Einfluss der Witterungsfaktoren Temperatur, Niederschlag, Sonnenschein und relative Luftfeuchte auf die Ernteerträge KATASTER-DETAIL: Delta T (Winter) +, dann Erträge (Wintergetreidearten) +; Delta T (März)+, Delta Sonn (März) + und Delta Nied (März) -, dann Erträge (Wintergetreidearten) +; Delta T (Sommer) -, dann Erträge (Wintergetreidearten) +; Delta Relf 〈 Pentadenmittel, dann Erträge (Winterweizen) +; Delta Relf (letzte Maihälfte) 〉 Pentadenmittel und Delta T (letzte Maihälfte) -, dann Erträge (Winterweizen) +; Delta Nied (Sommer) -, dann Erträge -; Delta Nied (Blütezeit), dann Erträge (Roggen) -; Delta Sonn (März) + und Delta Nied (März) -, dann Erträge (Zuckerrüben und Kartoffeln) +; delta Sonn (Ende Juni) + und Delta Nied (Ende Juni) -, dann Erträge (Kartoffeln) +; Delta T (August) und Delta Sonn (August), dann Erträge (Zuckerrüben) +;
    Keywords: Hessen, Département Aisne (Frankreich) ; 1936-53 ; Zuckerrüben ; Luftfeuchte ; Kartoffeln ; Getreide ; Niederschlag ; Roggen ; Temperatur ; Weizen ; Witterung ; Sonnenscheindauer ; Gerste
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  • 35
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    In:  Diss., Göttingen
    Publication Date: 1914
    Description: Ertragsschwankungungen in Abhängigkeit des Bodens, Bandbreite der Erträge auf verschiedenen Böden KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Grossraum Göttingen ; 1854-1906, 1810-1859 ; Boden ; Ertrag ; Hafer ; Roggen ; Weizen ; Düngung
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  • 36
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    In:  Kühn-Archiv 20:140-222.
    Publication Date: 1929
    Description: Untersuchungen an Ernteergebnissen mittels Rangordnungs- und Korrelationsmethode zur Abhängigkeit von den Witterungsfaktoren. Untersucht wurden die Erträge von Weizen, Roggen, Sommergerste, Hafer, Erbsen und Zuckerrüben KATASTER-BESCHREIBUNG: Einfluss der Witterung (Temperatur, Niederschlag, Sonnenscheindauer) auf die Erträge der Kurlturpflanzen KATASTER-DETAIL: Delta T (Oktober, November) - und Delta T (Januar, Februar) +, dann Erträge (Weizen) +; Delta Nied (April, Mai) + und Delta Nied (Februar, März) -, dann Erträge (Weizen) +; Delta Sonn (März) +, dann Erträge (Weizen) +; Delta Nied (Mai - Zeit des Schossens) +, dann Erträge (Roggen) +; Delta T (November) -, dann Erträge (Roggen) +; Delta Nied (April, Juni) + und Delta T (April, Juni) -, dann Erträge (Sommergerste) +; Nied (April, Juni) 〉 180mm, dann Erträge (Sommergerste) -; Delta Sonn (März, April) + und Delta Sonn (Mai) -, dann Erträge (Sommergerste) +; Delta Nied (April bis Juni) +, dann Erträge (Hafer) +; Delta Sonn (März, April) +, dann Erträge (Hafer) +; Delta T (Juni) -, dann Erträge (Hafer) +; Delta Nied (Juni, September) +, dann Erträge (Zuckerrübe) +; Delta Nied (August) +, Zuckergehalt +; Delta T (Juni) +, dann Erträge (Zuckerrübe) +; Delta Sonn (September) +, Qualität der Ernte +; Delta Sonn (März, April) + und Delta Sonn (Mai, Juni) -, dann Erträge (Getreide) +;
    Keywords: Mansfelder See- und Saalkreis, Kreis Querfurt, Kreis Merseburg ; 1900-1925 ; Zuckerrüben ; Hafer ; Niederschlag ; Roggen ; Temperatur ; Weizen ; Witterung ; Sonnenscheindauer ; Gerste ; Erbsen
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  • 37
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    In:  Prakt. Bl.Pflnzenbau und Schutz 16 (7): 54-56
    Publication Date: 1913
    Description: Zusammenhang niedrige Temperaturen und Auswinterungsschäden, Beschreibung der Ausmaße KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Bayern ; 1913 ; Roggen ; Frost
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  • 38
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    In:  VII. Int. Geographen Kongress. V. d. V. I. G. Kongresses. Berlin
    Publication Date: 1900
    Description: Zusammenhang zwischen Witterung und Erträgen; Temperatur, Niederschlag, Ernte (teils Schätzungen), Vergleich der Temperaturschwankungen von Januar-März mit den Weizenerträgen und Beziehung der Niederschlagshöhe von April-Mai zu den Hafererträgen, Beziehung zu Klima Kristiansund KATASTER-BESCHREIBUNG: Einfluss der Witterung (Temperatur, Niederschlag) auf den Ertrag von Weizen, Hafer und Gerste KATASTER-DETAIL: Delta T (Beginn des Jahres) +, dann Erträge (Weizen) +; Delta Nied (Beginn des Jahres) +, dann Erträge (Weizen) -; Delta Nied (Frühsommer) +, dann Erträge (Hafer, Gerste) +;
    Keywords: Preußen, Norddeutschland ; 1846-1892 ; Hafer ; Roggen ; Temperatur ; Trockenheit ; Weizen ; Witterungsextreme
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  • 39
    Publication Date: 1959
    Description: Untersuchung der Beziehung zwischen Temperaturabweichungen und phänologischen Beobachtungen in verschiedenen Regionen KATASTER-BESCHREIBUNG: Einfluss der Temperatur auf die Pflanzenentwicklung, bzw. auf den Zeitpunkt der Reife KATASTER-DETAIL: Delta T (Mai, Juni, Juli) -, dann Pflanzenentwicklung - (später);
    Keywords: Paris, Berlin, Mittel-England, Niederlande ; 1731-40 ; Phänologie ; Roggen ; Temperatur ; Weizen
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  • 40
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    In:  Wissenschafltiche Zeitschrift der Universität Leipzig, Naturwissenschaftliche Reihe 13:897-903
    Publication Date: 1964
    Description: Untersuchungen zur zum Einfluss der Bodenfeuchte sowie der Luft- und Bodenwärme auf Erträge, Hinweise auf rel. Luftfeuchte KATASTER-BESCHREIBUNG: Einfluss der Feuchtigkeit der oberen Bodenschicht auf den Ernteertrag KATASTER-DETAIL: Delta Bodenfeuchte (0 bis 5cm) 〈 2%, dann Zuwachs (Sommergerste) -; Feuchtigkeit (obere Bodenschicht) 〉 Feuchtigkeit (untere Bodenschicht), dann Erträge +; Feuchtigkeit (obere Bodenschicht) 〈 Feuchtigkeit (untere Bodenschicht), dann Erträge -;
    Keywords: Pulawy und Krakow (Tschechien) ; 1953-63 ; Boden ; Ertrag ; Roggen ; Wachstum ; Wassermangel
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  • 41
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    In:  Kühn-Archiv:53-78.
    Publication Date: 1925
    Description: Einführung der Rangordnungs- und Korrelationsmethode anhand langjähriger Beobachtungen, Einfluss des Niederschlages und der Temperatur auf den Ertrag von Erbsen, Kartoffeln, Weizen, Hafer und Roggen KATASTER-BESCHREIBUNG: Einfluss der Witterung (Temperatur und Niederschlag) auf den Ertrag KATASTER-DETAIL: Delta T (März und April) + und Delta Nied (März und April) -, dann Erträge (Erbsen) +; Delta T (Mai und Juni) - und Delta Nied (Mai und Juni) +, dann Erträge (Erbse) +; Delta T (Oktober Vorjahr) +, dann Erträge (Kartoffel) +; Delta T (März) + und Delta T (Mai und Juni) -, dann Erträge (Winterweizen) +; Delta Nied (Januar bis März)-, dann Erträge (Hafer) +; Delta Nied (Januar bis März)-, dann Erträge (Winterroggen) +;
    Keywords: Halle ; 1893-25 ; Kartoffeln ; Ertrag ; Fichte ; Hafer ; Korrelationsmethode ; Niederschlag ; Rangordnungsmethode ; Roggen ; Temperatur ; Weizen ; Witterung
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  • 42
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    In:  2 -NAP 02-231 Bericht IV Interreg IIIA Literaturstudie alpine Kulturpflanzen Vs. 3.0 070425.
    Publication Date: 2007
    Description: Sammlung historischer Informationen und Dokumentation des bäuerlichen Erfahrungswissens Kulturpflanzen von der Prähistorie - 20. Jahrhundert KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Südtirol, Nordtirol und GraubündenSüdtirol, Nordtirol und Graubünden ; Kartoffeln ; Anbautermine ; Boden ; Ertrag ; Getreide ; Hafer ; Klima ; Landwirtschaft ; Mais ; Niederschlag ; Pflanzenkrankheit ; Pflanzenschädling ; Roggen ; Temperatur ; Trockenheit ; Vegetationsperiode ; Weizen ; Wetterbeobachtung ; Witterung ; Düngung ; Hackfrüchte
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  • 43
    Publication Date: 1977
    Description: Einfluss meteorologischer Elemente auf den Ertrag von Winterroggen,Einteilung der Witterungsabschnitte entsprechend der phänologischen Phasen. Enge Korrelation zwischen der Niederschlagssumme der gesamten Vegetationsperiode und dem Ertrag. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Brandenburg ; Ertrag ; Korrelationsmethode ; Niederschlag ; Roggen ; Vegetationsperiode ; Wassermangel ; Witterung
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  • 44
    Publication Date: 1909
    Description: Beobachtungen zum Einfluss von Kälte auf Vegetations-Verlauf bei Roggen und Weizen, Raps, Vernilisation KATASTER-BESCHREIBUNG: Einfluss von Kälte auf den Vegetations-Verlauf KATASTER-DETAIL: Delta T (nach dem Aufgang) - (=Kälteperiode), dann Schossen +; Nachfröste = 0 (nach dem Aufgang), dann Schossen = 0; Delta T (Winter) +, dann Blüten an Obstbäumen -;
    Keywords: Sachsen-Anhalt ; 1906 ; Anbautermine ; Landwirtschaft ; Roggen ; Temperatur ; Wachstum ; Weizen
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  • 45
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    In:  Landw. Jahrbuch für Bayern.
    Publication Date: 1916
    Description: Einfluß der Temperatur auf die Phänologie des Roggens KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Bayern ; Ertrag ; Phänologie ; Roggen ; Temperatur
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  • 46
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    In:  Akademische Verlagsgesellschaft Geest & Portig K.-G., Leipzig., p. 117-173
    Publication Date: 1957
    Description: Untersuchungen zum Zusammenhang zwischen der Reifedauer von Winterroggen und der Witterung mittels phänologischer Beobachtungen KATASTER-BESCHREIBUNG: Beziehung der mittleren täglichen Globalstrahlung und der Reifedauer KATASTER-DETAIL: Delta Globalstrahlung+, dann Reifedauer -
    Keywords: Deutschland/europäische Städte ; 1916-1949 ; Ertrag ; Niederschlag ; Roggen ; Temperatur ; Witterung ; Globalstrahlung
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  • 47
    Publication Date: 1960
    Description: Zusammenhang Temperatur, Strahlung und Niederschlag in den Monaten März-April und Juni-August mit dem Ertrag von Grünland, Roggen und Weizen KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Niederlande ; 1947-1959 ; Landwirtschaft ; Niederschlag ; Roggen ; Temperatur ; Trockenheit ; Weizen ; Globalstrahlung ; Erbsen
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  • 48
    Publication Date: 1937
    Description: Untersuchungen zur Bedeutung der Winterfeuchtigkeit für Roggen bis etwa zum Zeitpunkt des Ährenschiebens, Wechselwirkung Sonnenscheindauer, Temperatur und Niederschlag in unterschiedlichen phänologischen Stadien bei unterschiedlichen Roggensorten und variierender Stickstoffgabe KATASTER-BESCHREIBUNG: Einfluss der Witterung (Sonnenschein, Temperatur, Niederschlag)auf das Wachstum KATASTER-DETAIL: Delta Sonn -, dann Längenwachstum +; Winterfeuchtigkeit +, dann Wachstum +; Delta Nied (von N-Düngung bis Ährenschieben) - und Delta T (von N-Düngung bis Ährenschieben) +, dann Längenwachstum = max; Delta Nied (Hauptvegetationszeit) +, Delta T (Hauptvegetationszeit) -, Delta Sonn (Hauptvegetationszeit) -, dann Längenwachstum +; Delta Nied (Hauptvegetationszeit) + und Delta Wind (Hauptvegetationszeit) +, dann Lagerbildung +;
    Keywords: Brandenburg, Versuchsfeld Bornim bei Potsdam ; 1932-36 ; Ertrag ; Landwirtschaft ; Niederschlag ; Roggen ; Temperatur ; Wachstum ; Düngung
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  • 49
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    In:  Mitteilungen der Biolog. Reichsanstalt f. Land- und Forstwirtschaft 25.
    Publication Date: 1924
    Description: Witterung und Phänologie KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Phänologie ; Roggen ; Witterung
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  • 50
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    In:  Zeitschrift für Acker- und Pflanzenbau 3:330-334.
    Publication Date: 1926
    Description: Angabe von Niederschlagsmengen und Durchschnittstemperaturen für das ökologische Optimum bestimmter Sorten, kritische Zeiten (vor und nach der Blüte) sind hierfür entscheidend KATASTER-BESCHREIBUNG: Einfluss von Wasser und Wärme, bzw. Niederschlag und Temperatur auf den Ertrag KATASTER-DETAIL: Roggen, Weizen: Delta Nied (Beginn Blütezeit)-, dann Ertrag +; Hafer, Gerste, Kartoffel: Delta T (Beginn der Blüte) -, dann Ertrag +; Bohne: Delta T (gesamte Wachstumszeit)+ und Delta Nied (gesamte Wachstumszeit) +, dann Ertrag +
    Keywords: Göttingen ; 1901-22 ; Kartoffeln ; Ertrag ; Getreide ; Hafer ; Klima ; Korrelationsmethode ; Niederschlag ; Roggen ; Temperatur ; Weizen ; Witterung ; Hackfrüchte ; Erbsen
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  • 51
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    In:  Zeitschrift Acker- und Pflanzenbau 109:79-94.
    Publication Date: 1959
    Description: Versuch der Erarbeitung einer Methode für die frühzeitige Prognose des Winterroggenertrages KATASTER-BESCHREIBUNG: Beziehung Witterung und Ertrag Roggen Funktion von Ertrag zu Wetterzahl bei unterschiedlichen Düngeintensitäten KATASTER-DETAIL: schwach wasserzehrende Konstellation (Zeit des Wuchsbeginss), dann Erträge +; Delta T (Zeit des Schossens)- und Delta Nied (Zeit des Schossens)+, dann Ertrag +; Delta T (Zeit der Halmstreckung)- und Delta Nied (Zeit der Halmstreckung) -, dann Ertrag +; Delta T (Hauptwachstumszeit) - und Delta Nied (Hauptwachstumszeit) +, dann Erträge +;
    Keywords: Thyrow, Versuchsgut der HU in Brandenburg ; 1936-55 ; Ertrag ; Landwirtschaft ; Roggen ; Witterung
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  • 52
    Publication Date: 1950
    Description: Einfuß der Temperatur, Sonnenscheindauer und des Niederschages auf die Reifedauer des Roggens KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Deutschland ; 1936-37 ; Ertrag ; Phänologie ; Roggen ; Trockenheit ; Wachstum ; Witterung
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  • 53
    Publication Date: 1950
    Description: Beobachtungen zum Auftreten von Roggengallmücke, Halmfliege, Getreidehalmwespe, Hafermilbe und Zwergzikade unter bestimmten Witterungsbedingungen (warme und trockene Sommer und Herbste) KATASTER-BESCHREIBUNG: Einfluss der Witterung (Temperatur und Niederschlag) im Sommer und Herbst auf das Auftreten der Getreideschädlinge KATASTER-DETAIL: Delta T (Sommer und Herbst) + und Delta Nied (Sommer und Hebrst) -, dann Auftreten +; Trockenperioden über mindestens 2 Jahre, dann Massenauftreten
    Keywords: Bayern ; 1947-1950 ; Anbautermine ; Landwirtschaft ; Niederschlag ; Pflanzenschädling ; Roggen ; Temperatur ; Trockenheit ; Weizen ; Witterung
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  • 54
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    In:  Nassauer Land 108, p. 185
    Publication Date: 1926
    Description: Beobachtungen zum Gelbrostbefall von Weizen, Roggen und Gerste KATASTER-BESCHREIBUNG: - KATASTER-DETAIL: -
    Keywords: Deutschland ; 1926 ; Infektionskrankheiten ; Getreide ; Pflanzenkrankheit ; Roggen ; Weizen ; Gerste
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  • 55
    Publication Date: 2007-11-17
    Description: Artificial biochemical circuits are likely to play as large a role in biological engineering as electrical circuits have played in the engineering of electromechanical devices. Toward that end, nucleic acids provide a designable substrate for the regulation of biochemical reactions. However, it has been difficult to incorporate signal amplification components. We introduce a design strategy that allows a specified input oligonucleotide to catalyze the release of a specified output oligonucleotide, which in turn can serve as a catalyst for other reactions. This reaction, which is driven forward by the configurational entropy of the released molecule, provides an amplifying circuit element that is simple, fast, modular, composable, and robust. We have constructed and characterized several circuits that amplify nucleic acid signals, including a feedforward cascade with quadratic kinetics and a positive feedback circuit with exponential growth kinetics.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhang, David Yu -- Turberfield, Andrew J -- Yurke, Bernard -- Winfree, Erik -- New York, N.Y. -- Science. 2007 Nov 16;318(5853):1121-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Computation and Neural Systems, California Institute of Technology, MC 136-93, 1200 East California Boulevard, Pasadena, CA91125, USA. dzhang@dna.caltech.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18006742" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Catalysis ; Chemical Engineering ; *Computers, Molecular ; DNA/*chemistry ; Entropy ; Equipment Design ; Feedback, Physiological ; Mice ; Nanotechnology ; Nucleic Acid Hybridization ; Rabbits
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 56
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    Unknown
    American Association for the Advancement of Science (AAAS)
    Publication Date: 2012-11-28
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Savage, Phillip E -- New York, N.Y. -- Science. 2012 Nov 23;338(6110):1039-40. doi: 10.1126/science.1224310.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Chemical Engineering Department, University of Michigan, Ann Arbor, MI 48109, USA. psavage@umich.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23180853" target="_blank"〉PubMed〈/a〉
    Keywords: *Biofuels ; Cell Culture Techniques ; Chemical Engineering ; Chlorophyta/*chemistry/growth & development ; *Hot Temperature ; *Hydrostatic Pressure ; *Water
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 57
    Publication Date: 2014-10-04
    Description: Ethanol toxicity in the yeast Saccharomyces cerevisiae limits titer and productivity in the industrial production of transportation bioethanol. We show that strengthening the opposing potassium and proton electrochemical membrane gradients is a mechanism that enhances general resistance to multiple alcohols. The elevation of extracellular potassium and pH physically bolsters these gradients, increasing tolerance to higher alcohols and ethanol fermentation in commercial and laboratory strains (including a xylose-fermenting strain) under industrial-like conditions. Production per cell remains largely unchanged, with improvements deriving from heightened population viability. Likewise, up-regulation of the potassium and proton pumps in the laboratory strain enhances performance to levels exceeding those of industrial strains. Although genetically complex, alcohol tolerance can thus be dominated by a single cellular process, one controlled by a major physicochemical component but amenable to biological augmentation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4401034/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4401034/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lam, Felix H -- Ghaderi, Adel -- Fink, Gerald R -- Stephanopoulos, Gregory -- R01 GM035010/GM/NIGMS NIH HHS/ -- R01-GM035010/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2014 Oct 3;346(6205):71-5. doi: 10.1126/science.1257859. Epub 2014 Oct 2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA, USA. Whitehead Institute for Biomedical Research, Cambridge, MA, USA. ; Department of Chemical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA, USA. ; Whitehead Institute for Biomedical Research, Cambridge, MA, USA. gfink@wi.mit.edu gregstep@mit.edu. ; Department of Chemical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA, USA. gfink@wi.mit.edu gregstep@mit.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25278607" target="_blank"〉PubMed〈/a〉
    Keywords: *Biofuels ; Cation Transport Proteins/genetics ; Cell Culture Techniques ; Cell Membrane/metabolism ; Chemical Engineering ; *Drug Resistance, Fungal/genetics ; Ethanol/*metabolism/pharmacology ; Fermentation ; Genetic Engineering ; Glucose/metabolism ; Hydrogen-Ion Concentration ; Phosphates/*metabolism ; Potassium Compounds/*metabolism ; Proton Pumps/genetics ; Proton-Translocating ATPases/genetics ; Saccharomyces cerevisiae/drug effects/genetics/*metabolism ; Saccharomyces cerevisiae Proteins/genetics ; Up-Regulation ; Xylose/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 58
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2014-11-29
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Langer, Robert S -- Gura, Trisha -- New York, N.Y. -- Science. 2014 Nov 28;346(6213):1146. doi: 10.1126/science.346.6213.1146.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Trisha Gura is a freelance writer who lives in Boston. For more on life and careers visit www.sciencecareers.org.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25430772" target="_blank"〉PubMed〈/a〉
    Keywords: Biotechnology ; *Career Choice ; Chemical Engineering ; *Entrepreneurship ; *Science
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 59
    Publication Date: 2016-03-19
    Description: Exploiting binding affinities between molecules is an established practice in many fields, including biochemical separations, diagnostics, and drug development; however, using these affinities to control biomolecule release is a more recent strategy. Affinity-controlled release takes advantage of the reversible nature of noncovalent interactions between a therapeutic protein and a binding partner to slow the diffusive release of the protein from a vehicle. This process, in contrast to degradation-controlled sustained-release formulations such as poly(lactic-co-glycolic acid) microspheres, is controlled through the strength of the binding interaction, the binding kinetics, and the concentration of binding partners. In the context of affinity-controlled release--and specifically the discovery or design of binding partners--we review advances in in vitro selection and directed evolution of proteins, peptides, and oligonucleotides (aptamers), aided by computational design.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pakulska, Malgosia M -- Miersch, Shane -- Shoichet, Molly S -- Canadian Institutes of Health Research/Canada -- New York, N.Y. -- Science. 2016 Mar 18;351(6279):aac4750. doi: 10.1126/science.aac4750.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemical Engineering and Applied Chemistry, Institute of Biomaterials and Biomedical Engineering, and Donnelly Centre, University of Toronto, Toronto, Ontario, Canada. ; Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada. ; Department of Chemical Engineering and Applied Chemistry, Institute of Biomaterials and Biomedical Engineering, and Donnelly Centre, University of Toronto, Toronto, Ontario, Canada. Department of Chemistry, University of Toronto, Toronto, Ontario, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26989257" target="_blank"〉PubMed〈/a〉
    Keywords: Chemical Engineering ; Combinatorial Chemistry Techniques ; Delayed-Action Preparations/*chemistry ; Directed Molecular Evolution ; *Drug Design ; Humans ; Lactic Acid/*chemistry ; Microspheres ; Polyglycolic Acid/*chemistry ; Proteins/*administration & dosage
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 60
    Electronic Resource
    Electronic Resource
    Springer
    European journal of nutrition 35 (1996), S. 199-205 
    ISSN: 1436-6215
    Keywords: α-Amylase Inhibitoren ; lösliches Arabinoxylan ; Roggen ; postprandiale Glykämie ; diabetische Ratten ; Type-II-Diabetiker ; α-amylase-inhibitors ; soluble arabinoxylan ; rye ; postprandial glycemia ; diabetic rats ; type-II-diabetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary The protein inhibitor of the α-amylase (D-type) and the soluble arabinoxylan of rye (Var. Clou) were isolated from flour and bran, respectively. The isolation of the α-amylase inhibitor involves the extraction of rye flour in aqueous CaCl2-solution (2 × 10−3M) containing the hemicellulase preparation Veron HE (2 g/100 g flour), dialysis and lyophilization (preparation I) and further fractionation with ammonsulfate, using the fraction 20–50 % for isolation (preparation II). The arabinoxylan isolation is carried out using extraction of rye bran in 80 % ethanol (80 °C), centrifugation, aqueous extraction of the sediment, dialysis and lyophilization (preparation I). The further purification using the precipitate of the fraction 20–50 % leads to preparation II. The α-amylase inhibitor preparation II and the arabinoxylan preparation II were applied in a diet containing wheat starch and casein and fed to diabetic and healthy rats (Levis and Wistar). The postprandial increase of glucose was determined. It was detected that the postprandial increase of glucose is influenced neither by the α-amylase inhibitor nor by the soluble arabinoxylan in comparison to the control experiments. However, the α-amylase inhibitor of wheat significantly decreases the postprandial increase of glucose. The application of a test meal with α-amylase inhibitor of rye to health and diabetic of type-II-volunteers showed no variation of the blood glucose values. The reduction of the increase of glucose by the soluble β-glucan of oat cannot be confirmed for the soluble arabinoxylan of rye. We conclude that the effect of the α-amylase inhibitor as well as the soluble pentosan or glucan has to be examined for each cereal species.
    Notes: Zusammenfassung Aus Roggenmehl und Roggenkleie der Sorte „Clou“ werden der Protein-Inhibitor der α-Amylase und das lösliche Arabinoxylan isoliert. Die Anreicherung des α-Amylase-Inhibitors erfolgt durch Extraktion von Roggenmehl in wässriger CaCl2-Lösung (2 × 10−3M) unter Zusatz des Hemizellulasepräparates Veron HE (2 g/100 g Mehl), anschließende Dialyse und Lyophilisierung (Präparat I). Durch weitere Ammonsulfatfraktionierung und Aufarbeitung der Fraktion 20–50 % Sättigung wird Präparat II gewonnen. Das Arabinoxylanpräparat wird durch Extraktion von Roggenkleie in 80 % Ethanol bei 80 °C, Zentrifugation, wässrige Extraktion des Sedimentes, Dialyse und Lyophilisation gewonnen (Präparat I). Aus dem Extrakt wird Präparat II durch Ethanolfraktionierung und Aufarbeitung der Fraktion 20–50 % isoliert. Das durch Ammonsulfatfraktionierung gereinigte α-Amylase-Inhibitor-Präparat und das durch Ethanolfraktionierung angereicherte Arabinoxylanpräparat werden mit einem Testfutter, bestehend aus Weizenstärke und Casein, an diabetische und stoffwechselgesunde Ratten appliziert und im Blut der postprandiale Glucoseanstieg bestimmt. Es wird nachgewiesen, daß dieser sowohl durch den Inhibitor als auch durch das lösliche Arabinoxylan des Roggens im Vergleich zur Kontrolle nicht beeinflußt wird. Dagegen führte der α-Amylase-Inhibitor des Weizens zu einer signifikanten Verminderung des Glucoseanstiegs. Nach Verzehr einer Testmahlzeit mit zugesetztem α-Amylase-Inhibitor aus Roggen durch Stoffwechselgesunde und Typ-II-Diabetiker kann ebenfalls keine Veränderung der Blutglucosewerte nachgewiesen werden. Somit läßt sich die Senkung des Glucoseanstiegs durch das lösliche β-Glucan aus Hafer mit dem löslichen Arabinoxylan des Roggens nicht bestätigen. Daraus ergibt sich sowohl beim α-Amylase-Inhibitor als auch beim löslichen Pentosan/Glucan die Notwendigkeit, die Wirksamkeit bei jeder Getreideart zu prüfen.
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  • 61
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    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 28 (1988) 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
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  • 62
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    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 28 (1988), S. 413-420 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: This paper presents the development of the boundary element equations for the compression molding process of isothermal Newtonian fluids. It shows the numerical implementation of the boundary element equations and presents a simple method of carrying out the domain integral present in the governing equations. The results and accuracy of a boundary element simulation are discussed, and the numerical results compared to experimental values.
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  • 63
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    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 28 (1988), S. 605-609 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The static delamination behavior of graphite/epoxy composite specimens subjected to mode I tensile opening (using UDCBUniform double cantilever beam. specimens), and pure mode II shear loading (using ENFEnd-notched flexural. specimens) were studied. The graphite epoxy composites for the study were made from commercially treated fibers, with and without an electropolymerized interlayer. The mode I fracture energy (GIC) was found to be significantly higher (more than 50 percent) for the coated fibers. However, this improvement was accompanied by a high reduction (more than 3 times) in the mode II fracture energy (GIIC). This effect is apparently related to poor adhesion between the interlayer and the epoxy resin, which may be corrected by use of a “top layer” of appropriate composition to form chemical bonds between the phases. The fracture toughness (KIC) of composites made with commercially treated fibers was also evaluated, using double side-notched specimens.
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  • 64
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    Polymer Engineering and Science 28 (1988), S. 583-591 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: An analytical methodology was developed capable of describing interrelations between thermal processing and polymer structure for thermoplastic based composite laminates. Specifically, this modeling methodology was used to describe experimental results generated with a specially designed match die quench mold by processing both neat PEEK polymer and carbon fiber reinforced laminate samples at different cooling rates. The developed model accurately predicted temperature profiles for PEEK laminates of different thicknesses, under normal as well as extreme quenching conditions of 114°C/s. surface cooling rates that are possible to generate with the quench mold. In general, the modeling methodology is capable of predicting a part's thermal profile during processing in terms of the composite's microscopic intrinsic properties (fiber and matrix), composition, and lamina orientation. Furthermore, by coupling to the thermal profile description, a previously developed crystallization kinetics model for PEEK polymer and its carbon reinforced composite, a quantitative description of structural development during processing was obtained. Thus, with this analytical methodology, a skin-core crystallinity profile, where the crystallinity varies with part-thickness as a result of uneven cooling experienced during processing, was predicted both for the neat PEEK polymer and its carbon reinforced laminate forms. Finally, the developed methodology clearly established the interplay of both microscopic heat transfer and kinetics of crystallization/solidification of the matrix that must be accounted for in predicting the final structure of a carbon fiber reinforced laminate that will, in turn, govern microscopic and macroscopic performance.
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  • 65
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    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 28 (1988), S. 634-639 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Neat poly(ether-ether-ketone) (PEEK) and carbon fiber reinforced PEEK (APC-2) specimens were prepared using a variety of cooling rates to achieve a range of crystallinities. Amorphous specimens were exposed to a variety of fluids to determine the penetrant types which are able to strongly influence the material. This allowed the estimation of the solubility parameter and hydrogen bonding index for PEEK to be 9.5 and 3.1, respectively. Methylene chloride was used to investigate the kinetics of penetrant sorption. The data demonstrated Case II behavior, with the initial crystallinity having a pronounced effect on both the kinetic and equilibrium data. Accordingly, a model was proposed capable of describing the sorption level and penetration depth as a function of time given the sample crystallinity and sorption temperature. With Case II behavior there was no difference in the sorption kinetics of neat and fiber reinforced PEEK. Finally, the dynamic mechanical properties measured during sorption were found to be dependent on the sorption process.
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  • 66
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    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 28 (1988), S. 670-678 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The dynamic shear viscosity and the morphology of polypropylene homopolymer and copolymer blended with linear low density polyethylene are studied. A maximum in the dynamic shear viscosity vs. blend composition is reported for the polypropylene copolymer, linear low density polyethylene system. The increasing dynamic shear viscosity is in accordance with the occurrence of a morphology of polyethylene inclusions in rubber surrounded by a polypropylene matrix. Comparing calculations of the dynamic shear viscosities - based on a shell model with interlayer - and experimental results supports this view.
    Additional Material: 17 Ill.
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  • 67
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    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 28 (1988), S. 684-687 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Hydroxy-terminated copoly(fstyrene-b-1,2-butadiene) (HPSB) containing rubber-affinitive vinyl side chains and having a molecular weight of 2000 to 4000 were prepared, and block copolyurethanes were synthesized by using a low molecular weight hydroxy-terminated poly (ethyl en e terephthalate) as a PET-affinitive component and 4,4′-diphenylmethane diisocyanate as a chain extender. The relationships between the molecular weight of HPSB, copolymerization ratio of styrene to butadiene and the adhesive strength of PKT/rubber in high temperature atmospheres were examined. A peak of adhesive strength was observed at styrene copolymerization ratio of 20 wt percent and a HPSB molecular weight of 3000. The adhesion mechanism was estimated from the behavior of the characteristic infrared absorption of block Copolyurethane in heating.
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  • 68
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    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 28 (1988), S. 718-727 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: In vibration welding of thermoplastics, frictional work done by vibrating two parts under pressure, along their common interface, is used to generate heat to effect a weld. The main process parameters in vibration welding are the weld frequency, the amplitude of the vibratory motion, the weld pressure, and the weld time. How these parameters affect weld quality, the conditions that result in the best welds, the weldability of dissimilar plastics, and the effect of fillers such as glass are of interest. To address these issues, a research vibration welding machine in which all the parameters can be independently and accurately controlled and monitored was designed and fabricated. The phenomenology of welding, as determined by experiments on the four thermoplastics polycarbonate, poly (butylene terephthalate), polyetherimide, and modified poly (phenylene oxide), is described.
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  • 69
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    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 28 (1988), S. 743-757 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: An engineering analysis of the reactive extrusion process of a thermoplastic polyurethane was made through numerical simulation and actual experiment. The reactants used in this system were 4,4′diphenylmethane diisocyanate, polycaprolactone diol (M.W., 824), and 1,4-bu-tanediol with equivalent weight ratio of 2:1:1. As a catalyst, dibutyltin dilaurate was used. The reaction kinetics and the viscosity function were obtained through experiments, and the mathematical model which includes the conservation equations of mass, momentum, energy, and chemical species was solved numerically to obtain the velocity, concentration, temperature, viscosity, and pressure profiles. The actual experiments were performed in the laboratory scale extruder to compare the experimental results with those of the numerical simulation.
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  • 70
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    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 28 (1988), S. 775-784 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A series of polyurethane-urea/polyvinyl simultaneous interpenetrating polymer networks (SINs) were prepared starting from a mixture of isocyanate prepolymer blocked with N-(1-1′-dimethyl-3-cxobutyl) acrylamide oxime, chain extender, vinyl monomers, and catalysts. Their physical properties and morphology were investigated using differential scanning calorimetry, dynamic mechanical measurements, and small-angle X-ray scattering. The polyurethane-urea networks examined were two-phase in nature. The vinyl network was formed with diacetone acrylamide oxime, trimethylolpropane trimethacrylate, and N-vinyl-pyrrolidone. Calorimetric analyses revealed that the polyether soft segment phase separated within the SINs. At higher temperature, dynamic mechanical measurements demonstrated the presence of only one glass transition temperature (Tg) intermediate in temperature to the Tg of the vinyl network and the Tg of the urethane hard phase. This is indicative of chain entanglement (interpenetration) between the vinyl network and the polyurethane hard segments resulting in a two-phase morphology. Small-angle X-ray scattering analyses provided measurements of diffuse phase boundary thickness, phase mixing, and domain size distribution. Appreciable interfacial thickness was not observed and thus phase mixing occurred within the phases. Domain size distribution indicated that high network constraints hindered the development of domains and limited the phase segregation.
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  • 71
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    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 28 (1988) 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
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  • 72
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    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 27 (1987), S. 1021-1034 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Equations are derived that relate the orientation of “pseudo-affine” reoriented structural units after a biaxial deformation to the degrees and the directions of the effective drawings. The connection between these drawing parameters and those externally applied is analyzed in detail. It is shown how a comparison of these two sets of drawing parameters allows conclusions regarding the distribution throughout the material of the stresses that cause the deformation, the inhomogeneity of the deformation, and the role of non-orienting flow during deformation. In particular, the orientation of biaxially drawn poly(ethylene terephthalate) films is investigated, and it is shown what general information can be obtained on the deformation behavior of this material on the basis of these considerations.
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    Polymer Engineering and Science 27 (1987), S. 1059-1068 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Scale-up from small laboratory size extruders to large production size extruders is a procedure of great practical importance. Many scale-up rules and theories have been proposed in the past, however it is not always clear how the different scale-up methods will affect extruder performance. A basic analysis of scale-up in plasticating single screw extruders is developed from which the effect of a certain scale-up strategy on extrusion performance can be evaluated in terms of solids conveying, melting, melt conveying, mixing, residence time, heat transfer, power consumption, and specific energy consumption. Various existing scale-up theories are evaluated and compared using the basic analysis. A number of existing scale-up theories have some significant drawbacks, in particular with non-constant specific energy consumption and imbalance between melting rate and pumping rate. Conditions that are desirable to achieve in scale-up are enumerated and ranked in terms of importance. This leads to two new scale-up methods that result in constant mechanical specific energy consumption and high throughput rates. The first scale-up method keeps the specific surface area constant. This scale-up should work well for high values of the Brinkman number. However, at low values of the Brinkman number, the melting rate may be insufficient. The second scale-up method keeps the melting rate at low Brinkman number equal to the pumping rate and, thus, should be useful in cases where the first scale-up method cannot be used.
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    Polymer Engineering and Science 27 (1987) 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
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  • 75
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    Polymer Engineering and Science 27 (1987), S. 1128-1136 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The plane strain fracture toughness and fracture mechanisms of several tough engineering plastics have been studied and compared with poly(methyl methacrylate) (PMMA), a relatively brittle polymer. The tough polymers all are observed to form a multiple craze zone at the crack tip, which is shown to be the primary source of plane strain fracture toughness in these materials. The multiple craze zone is retained during slow crack growth but is metastable, and at a critical stress intensity and associated crack velocity, the system passes through a transition to a greatly accelerated single craze mode of unstable propagation.
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  • 76
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    Polymer Engineering and Science 27 (1987), S. 1148-1155 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The optical properties of bisphenol-A polycarbonate resin as described by the complex index of refraction, N = n - ik, are derived by Kramers-Kronig analysis of experimental absorption and reflectance data obtained in the range 40μm ≥ λ ≥ 105 nm. Electronic absorption processes in polycarbonate are characterized by two broad absorption peaks centered at ∼200 and ∼100 nm.
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  • 77
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    Polymer Engineering and Science 27 (1987), S. 1182-1186 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Three-layer coextruded blown (either blend or composite) films, made of low-density polyethylene and linear lowdensity polyethylene (1:1 ratio) of identical density, were compared. The tensile properties of both systems are nearly as high as those of the linear polyethylene while high strain rate properties including impact strength and tear resistance of the composite film are superior. Some structural insight was obtained by thermal analysis and thermoelastic measurements. Structure property relationships are discussed in light of the unique behavior, structure, and morphology of linear low-density polyethylene. The two polyethylenes are only compatible to a rather limited extent mainly affecting their blend behavior. However, a strong mutual reinforcement effect was observed.
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  • 78
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    Polymer Engineering and Science 27 (1987), S. 1203-1208 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A Viton copolymer containing vinylidene fluoride (VF2) and hexafluoropropylene (HFP), and a terpolymer containing VF2, HFP, and tetrafluoroethylene (TFE) were cross linked using varying amounts of Bisphenol AF to yield two series of fluoroelastomer networks, Stress-strain isotherms in elongation were determined for these samples at several temperatures and at two degrees of swelling with phenyl acetate. Strain-induced crystallization was observed, as evidenced by upturns in the isotherms at high elongations. It appears to be more pronounced in the terpolymer samples, presumably because the TFE units not only can crystallize themselves, but can co-crystallize with the VF2 units. The crystallization was found to persist upon moderate increase in temperature, but was suppressed when the networks were swollen, Thermoelastic (force-temperature) measurements were used to obtain values of the fraction fe/f of the elastic force that is due to energetic effects. Negative values were obtained for both types of samples and, in the case of two samples studied in detail, their magnitudes increased with increase in elongation. The magnitudes were larger and the increases more pronounced in the case of the terpolymer networks, as would be expected from a greater tendency for straininduced crystallization.
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  • 79
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    Polymer Engineering and Science 27 (1987), S. 1221-1228 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The transesterification reaction of molten ethylene and vinyl alcohol copolymers (EVA), in presence of paraffinic alcohols and basic catalysts, leads to high conversion of the ester groups to secondary alcohol in both discontinuous and continuous processing equipment. Various kinds of alcohols and two different catalysts were used. Sodium methoxide is a powerful catalyst for the equilibrated transesterification reaction, but we also observed side reactions, such as cross-linking with low-molecular-weight alcohols and hydrolysis of the catalyst followed by partial saponification of the EVA. Kinetic studies were performed in the presence of dibutyltin dilaurate, an efficient catalyst without any side reactions. The solubility of the main alcohol reagents was verified by diffusion measurements. The general reaction scheme and the related kinetics, corresponding to a homogeneous system, lead to a fair evaluation of the rate constants.
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  • 80
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    Polymer Engineering and Science 27 (1987), S. 1252-1257 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The mechanical properties of polyurethane-unsaturated polyester interpenetrating polymer networks (IPNs) that were prepared by reaction injection molding (RIM) process were measured with variations In composition, cross-link density, and relative reaction rate. From dynamic mechanical analysis (DMA), it was found that the two component polymers had a good compatibility over the whole composition range. The tensile strengths of the blends were greater than those of the pure components and had a maximum value at 50/50 composition. The modulus of elasticity and surface hardness decreased and the impact strength increased as the polyurethane content was increased, but the changes were not high at low polyurethane content, below 50%. For higher cross-link density, the compatibility was enhanced and the mechanical properties were improved. When the reaction rates of the components were different, some extent of phase separation was found in DMA and the properties were affected adversely.
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  • 81
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    Polymer Engineering and Science 28 (1988), S. 1152-1155 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Effects of absorbed moisture on degradation behavior of high nitrile barrier polymers were monitored using thermogravimetric analysis techniques. Non-modified and 10 percent rubber modified samples were heated isothermally at nitrile processing temperatures (200°C to 240°C) in air and nitrogen environments. Degradation was evaluated in terms of weight loss as a function of heating time and sample coloration. It was determined that complete removal of moisture, as well as high moisture concentration, contribute to increased degradation at the temperatures evaluated. Moisture levels in the range of 0.15 to 0.5 percent were found to minimize degradation. Heating environment, time, temperature, and rubber modification were also found to influence thermal stability.
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    Polymer Engineering and Science 28 (1988), S. 1167-1172 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: High density polyethylene has been chlorinated by three different methods: in suspension and in solutions of two different solvents. Carbon-13 NMR and infrared analysis show that chlorination in chlorobenzene solution leads to statistically random distribution while chlorination in suspension gives highly blocky substitution. An intermediate distribution was obtained by chlorination in tetrachloroethane solution.
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  • 83
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    Polymer Engineering and Science 28 (1988), S. 1198-1202 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The energy stored in polystyrene after plastic deformation is measured by the differential scanning calorimetry (DSC) technique. Similar to metals, the stored energy increases with plastic straining, first rapidly, and then more slowly, and finally the stored energy seems to approach a saturation value (about 1 cal/gram). By comparing to the plastic work done, the fraction stored ranges from 30 percent after 10 percent compression to 10 percent after 60 percent compression. The fraction is about twice as large as that of copper. The release of stored energy has two distinct parts, one below Tg and the other above Tg. Most of the strain recovery seems to accompany the second part. By using the Kissinger plot, the second part has an activation energy, of 142 kcal/mole which is about 10 percent larger than that of compressive strain recovery.
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  • 84
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    Polymer Engineering and Science 28 (1988), S. 1219-1226 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A trial and error approach reflects the state of the art in reaction injection molding. Material and process parameters determine the “moldability” of a specific system in a particular application. The concept of “molding areas” on the critical parameters plane can be extended form thermoplastic injection molding (TIM) to reaction injection molding (RIM).In this work moldability diagrams for the filling and curing stages of a RIM process are obtained based on a simplified engineering approach. The key process parameters chosen for the filling stage are initial material temperature and filling time. In the curing stage, the critical parameters are considered to be mold wall temperature and demold time. Experimental results obtained on a laboratory-scale RIM machine on a Crosslinking polyurethane system are used to check the validity of the predicted molding areas. The agreement obtained is satisfactory considering the broad range of processing parameters used.
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  • 85
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    Keywords: Chemistry ; Chemical Engineering
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    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The microstructure of injection molded bars (2.9 and 5.8 mm thick) of thermotropic liquid crystalline poly(p-hydroxy-benzoic acid-co-ethylene terephthalate) has been studied by SEM on samples etched with n-propylamine, SEM fractography, DSC, IR, ESCA, WAXS and polarized microscopy. The 2.9 mm bar consists of three different layers: a highly oriented surface skin, an oriented intermediate layer and a non-oriented core. The 5.8 mm bar has a more complex microstructure and is composed of five different layers: a highly oriented surface skin, an oriented layer just beneath, a non-oriented layer, another oriented layer and a non-oriented core. The thicknesses of the different layers vary, significantly, with distance from the mold gate. The thickness of the core increases, significantly, with increasing distance from the mold gate at the expense of the oriented layers. The structure within the different morphological layers is not perfectly uniform. Tensile testing demonstrated the mechanical anisotropy of the surface material (a ratio of almost 20 between the longitudinal and transverse moduli) and the isotropy of the central core material.
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  • 86
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    Polymer Engineering and Science 28 (1988), S. 1264-1269 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Rolling-drawing is a simple, effective, solid state processing technique for manufacturing high strength and high modulus oriented polymer sheet products. The process is capable of increasing the tensile modulus and strength of polypropylene by more, than an order of magnitude with inexpensive equipment and straight forward controllable techniques. This paper gives an overview of the rolling-drawing of polypropylene. It is intended to answer the following questions. What is rolling-drawing? What changes in tensile properties can be expected as a result of this process? What deformation processes occur during rolling-drawing? What are the processing variables and how do these variables relate to the deformation ratio achieved by rolling-drawing? A tensile flow stress relationship was formulated from experimental data for oriented polypropylene. This constitutive equation, estimates the flow stress (or yield stress) of the polymer as a function of deformation ratio, strain rate and temperature. Since stretching was found to provide a significant portion of the deformation during the rolling-drawing process a Hoffman-Sachs computer analysis was written to predict plastic deformation and drawing forces in the stretch zone. The results of experimentation and the analysis are briefly compared in this paper.
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  • 87
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    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: An extrusion-grade of high density polyethylene (HOPE) (3 ethyl groups per 1000 carbons) has been divided into 16 fractions by preparative GPC and selective p-xylene extraction. The fractions, with molecular weights ranging from 900 to 1,000,000, have been studied by IR spectros-copy, DSC, WAXS, polarized microscopy, and small-angle light scattering (SALS), The average degree of chain branching (percent C2H5) is 0.5 percent for the part of the sample having a molecular weight lower than 10,000 and it decreases monotonically with increasing molecular weight, finally approaching 0.1 percent C2H5. A crystallinity depression with respect to linear PE equivalent to 20 percent/(percent C2H5) is recorded for all samples except for the very low molecular weight samples for which the crystallinity depression is much larger (30 to 35 percent/ (percent C2H5)). The unit cell volume increases with increasing percent C2H5, presumably due to the inclusion of ethyl groups in the crystals as interstitlals at 2gl kinks. The concentration of ethyl groups in the crystals (∊c) unanimously follows the relationship: ∊c(percent) = 0.32 + 0.25 log(percent C2H5) except for the low molecular weight fractions which have significantly lower values for ∊c. Our admittedly speculative explanation for this major discrepancy between high and low molecular weight samples is based on the idea that segments with ethyl groups close to chain ends have a greater difficulty in crystallizing than segments containing ethyl groups located at positions far from the chain ends. The fractions obtained from the extrusion-grade HDPE show a solidification temperature depression with respect to linear PE which can only be explained by the presence of chain branches in these samples. The depression is particularly pronounced for the low molecular weight samples as is expected from the data on molecular structure. Well-developed non-banded spherulites are observed in rapidly cooled (crystallized at about 35 K supercooling), low molecular weight samples (6,000 〈 Mw 〈 8,000)from the extrusion-grade HDPE in contrast to the axialites observed in linear PE of the same molecular weight and thermal treatment. This discrepancy in morphology has been related to the presence of ethyl groups in the extrusion grade HDPE fractions. Higher molecular weight samples (20,000 〈 Mw 〈 1,000,000)from the extrusion-grade HDPE and linear PE both display well-developed banded spherulites of similar nature as is expected due to the similarity in molecular structure of the two sets of sample.
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  • 88
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    Polymer Engineering and Science 28 (1988), S. 1066-1070 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: In this work, a concept of distributed damage, including its inception and propagation, was applied to creep induced buckling of specimens prepared from high density polyethylene (HDPE). Using a kinetic relationship for damage accumulation, an integral equation for the front of the damage zone was derived. A time parameter associated with the inception of the damage front was obtained. The motion of the front was approximated for small times. Long time estimation was obtained using an assumption for a shape of the damage distribution. These results enabled us to review reported experimental results on creep induced buckling using a new insight into the relationship between applied load and time to buckle.
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    Polymer Engineering and Science 28 (1988), S. 1095-1106 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: We present a basic study of the thermal, dielectric, Theological, and mechanical properties of hydroxybenzoic acid-ethylene terephthalate copolymers (PHB-PET). It is argued that they have two-phase structures, one rich in ethylene terephthalate (PET) and one rich in hydroxybenzoic acid (PHB). Polystyrene (PS) is immiscible in 60% PHB-PET (60-PHB-PET) blends. Polycarbonate (PC) is partially miscible with the high PET phase of 60-PHB-PET. PET seems completely miscible with this high PET phase. Shear viscosity measurements on blends indicate that 60-PHB-PET gives rise to large reductions of viscosity. Extrudates and melt-spun fibers have been prepared. The phase morphologies of low PHB-PET blends as determined by scanning electron microscopy indicate ellipsoids or long fibrils of the, 60-PHB-PET in PS or PC matrices. High extrusion rates and melt spinning produce fibrillar structures. The mechanical properties of films, extrudates, and melt-spun fibers were studied. Blends with 10% 60-PHB-PET exhibited significant increases in Young's modulus and tensile strength.
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  • 90
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    Polymer Engineering and Science 28 (1988) 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
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  • 91
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    Polymer Engineering and Science 28 (1988), S. 1145-1151 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The kinetics of the activated anionic polymerization of caprolactam to nylon-6 and its copolymers has been studied. Nylon-6 block copolymer and nylon-6 were prepared at various initial reaction temperatures (140°C to 165°C) by anionic polymerization in an adiabatic dewar flask. Different concentrations of poly(ethylene oxide) (PEO) in 4,4′-diphenyl methane diisocyanate (MDI)-capped PEO and 1 mole percent MDI, in a caprolactam solution, were used as the activators with the catalyst, the sodium salt of caprolactam. The kinetics of the reaction were analyzed from an adiabatic temperature rise. A new method was applied to determine the rate parameters. The activation energy, Ea, of nylon-6 and nylon-6 block copolymers were found to be 22 kcal/mole. The collision frequency factor, Ao, steadily decreased and the autocatalytic constant, Bo, decreased to a constant value of 16 with the introduction of PEO. However, it was found that the order of reaction, n, was almost a constant value at the second order for all experiments.
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  • 92
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    Polymer Engineering and Science 28 (1988), S. 1173-1181 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Chlorination of high density; polyethylene results in polymers which consist of unmodified methylene units and chlorinated methylene co-units. The effect of the concentration and distribution of chlorinated units on the solid state structure has been examined by thermal, wide angle X-ray diffraction and dynamic mechanical analysis. As the substitution becomes more random, the crystallinity, crystallite size, and crystalline perfection decrease for a given chlorine content. The chlorinated units are shown to be capable of co-crystallizing, and the concentration of chlorine in the crystalline phase increases as the distribution is made more random. Concurrently, the chlorine concentration of the amorphous phase decreases. Segregation of chlorine into the amorphous regions is most efficient when the substitution is blocky.
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    Polymer Engineering and Science 28 (1988) 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
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  • 94
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    Polymer Engineering and Science 28 (1988), S. 1240-1247 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The reversible step growth polymerization in homogeneous continuous flow stirred tank reactors (HCSTRs), in which the condensation product (W) leaves the reactor through flashing, has been analyzed. The molecular weight distribution (MWD) of the polymer formed is governed by nonlinear coupled algebraic relations to be solved simultaneously. To find the MWD numerically a large number of these are normally solved simultaneously using a suitable iterative procedure. In this paper, these have been decoupled using the technique proposed in our earlier works (1, 2) and the MWD can now be obtained sequentially without any trial and error. This leads to considerable saving in computation time compared to methods currently used. To demonstrate the efficacy of the algorithm, the polycondensation step of the poly(ethylene terephthal-ate) (PET) formed in HCSTRs has been analyzed. The MWD, the average chain length and the polydispersity index of the polymer have been computed and it takes 0.1 CPU seconds on a DEC 1090 as opposed to the earlier method which would take seventy minutes for similar computations. The simple model of the HCSTR for the PET formation gives the effect of reactor temperature and pressure and the quantitative results have been presented in this paper.
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    Polymer Engineering and Science 28 (1988), S. 1270-1274 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A mathematical model is presented which describes the degree of cure in a thermosetting adhesive used to bond sheet molding compound (SMC) components. The model allows computer aided optimization of the thermosetting process for any type of electromagnetic heating of the various layers of the structure (e.g. dielectric, microwave or induction), arbitrary material properties and arbitrary layer thickness. Computer simulated results are given for the particular case when the cure of the thermosetting material is initiated by its exposure to a high-power radio-frequency electric field (dielectric heating). These results indicate a strong sensitivity of the process to the thickness of the adhesive layer and the degree of coupling with the electromagnetic field. The analysis demonstrates that substantial heat losses from the relatively thin adhesive layer to the structural members of the joint by diffusive heat flow can be counterbalanced by additional electric power dissipated either in the adhesive or the structural members of the joint. Although derived for dielectric heating, those results are general, being independent of the type of electromagnetic heating employed.
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    Polymer Engineering and Science 28 (1988), S. 1275-1275 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Linearly tapered coat hanger dies or T-dies are widely accepted. Nevertheless a newly proposed curvilinearly tapered coat hanger die has been shown to perform much better. It costs about the same as the other types of dies. This contribution is considered in terms of the recent literature.
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    Polymer Engineering and Science 28 (1988) 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
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    Polymer Engineering and Science 28 (1988), S. 1304-1312 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: We have determined the degree of stiffness of a poly(γ-benzyl α, L-glutamate) (PBLG) chain in benzyl alcohol by measuring the intrinsic viscosities of dilute Solutions with differing molecular weights. Viscoelastic properties in oscillatory shear flow have been studied and the dependence of the loss and storage moduli on temperature, composition, and frequency are reported. We have also studied the transient shear stress relaxation behavior of the PBLG gel at different temperatures and concentrations. A comparison has been made between these gels and a classical poly(dimethyl siloxane) (PDMS) network, as well as, typical glassy polymers. Shear creep and recovery measurements have been made for this system. Some extensional step strain experiments using lubricated squeezing have been investigated. Tensile experiments have been made to determine stress-strain relationship during elongation. Preliminary experiments using the impulse approach to viscoelasticity further indicate the high elastic contribution in the gel.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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  • 99
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 28 (1988), S. 1342-1342 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
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  • 100
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 28 (1988), S. 1347-1354 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: It is well known that equilibrium, thermodynamic properties are governed by different functional derivatives of the thermodynamic functions of state. For example, the phase behavior of mixtures of low and/or high molar mass components is determined by the compositional derivatives of the free energy. In this contribution, the merits of the Simha-Somcynsky theory in describing and predicting the phase behavior of mixtures are considered. The influence of temperature and composition on the miscibility behavior for practically binary polymer solutions are studied. Furthermore, the important aspect of polydispersity, inherent to synthetic polymer systems will be addressed.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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