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  • Organic Chemistry  (695)
  • ENERGY PRODUCTION AND CONVERSION  (496)
  • Animals  (443)
  • 1995-1999
  • 1980-1984  (1.634)
  • 1975-1979
  • 1982  (1.634)
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  • 1995-1999
  • 1980-1984  (1.634)
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  • 1
    Digitale Medien
    Digitale Medien
    Untersuchungen über den Thermischen Zerfall von n-Dodecylcyclopentan in der Gasphase (1982)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 324 (1982), S. 964-972 
    Details
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Investigations on the Thermal Decomposition of n-Dodecylcyclopentane in the Gas PhaseIn the thermal decomposition of n-dodecylcyclopentane at 670 and 750°C in a laboratory tubular reactor mixtures of hydrogen and 57 and 113 hydrocarbons respectively are formed. The mixtures have been analyzed and identified by capillary gas chromatography and by mass spectrometry. The distribution of the reaction products is used for mechanistic discussions.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prac.19823240615
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  • 2
    facet.materialart.
    Unbekannt
    The development and manufacture of wood composite wind turbine rotors (1982)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The physical properties, operational experience, and construction methods of the wood/epoxy composite MOD 0A wind turbine blades are considered. Blades of this type have accumulated over 10,000 hours of successful operation at the Kahuku, Hawaii and Block Island, Rhode Island test sites. That body of experience is summarized and related to the structural concepts and design drivers which motivated the original design and choice of interior layout. Actual manufacturing experience and associated low first unit costs for these blades, as well as projections for high production rates, are presented. Application of these construction techniques to a wide range of other blade sizes is also considered.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA. Lewis Research Center Large Horizontal-Axis Wind Turbines; p 287-301
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
    facet.materialart.
    Unbekannt
    Design and evaluation of low-cost laminated wood composite blades for intermediate size wind turbines: Blade design, fabrication concept, and cost analysis (1982)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: As part of a program to reduce wind turbine costs, an evaluation was conducted of a laminated wood composite blade for the Mod-OA 200 kW wind turbine. The effort included the design and fabrication concept for the blade, together with cost and load analyses. The blade structure is composed of laminated Douglas fir veneers for the primary spar and nose sections, and honeycomb cored plywood panels for the trailing edges sections. The attachment of the wood blade to the rotor hub was through load takeoff studs bonded into the blade root. Tests were conducted on specimens of the key structural components to verify the feasibility of the concept. It is concluded that the proposed wood composite blade design and fabrication concept is suitable for Mod-OA size turbines (125-ft diameter rotor) at a cost that is very competitive with other methods of manufacture.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA-CR-165463 , DOE/NASA/0101-1 , NAS 1.26:165463 , TRS-107
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
    Digitale Medien
    Digitale Medien
    Formation and dissociation mechanism of amide complexes. VPart IV, see [1]. Interconversion of dimeric and monomeric Cu2+-complexes with 1,8-diamino-3,6-diaza-2,7-octanedione: Comparison between the reactivity of terminal and internal amide groups (1982)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 65 (1982), S. 753-761 
    Details
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The protonation and deprotonation rates of the coordinated amide groups in the Cu2+-complexes of 1,8-diamino-3,6-diaza-2,7-octanedione (DED = L) have been studied by stopped-flow techniques. Starting at low pH from Cu2+ and DED the dimeric Cu2L24+-complex, fully formed within the mixing time of the stopped-flow instrument, reacts in two consecutive steps to yield the final product CuLH-2. The rate constants of the forward and backward reactions have been determined and are given in Table 1. The intermediate was identified as Cu2L2H-22+ by measuring its VIS.-absorption spectrum.The rate constants for the interconversion of the amide groups from the O- to the N-coordinated form in the Cu2+-complexes of DED, 2,10-dioxo-1, 4, 8, 11 tetraazaundecane (DANA) and triglycine (TRIGLY) are compared with each other. It is shown that these rate constants are similar, no matter whether the amide group is terminal or internal as long as the rotation is easily possible as is the case in the dimeric species Cu2L24+ and Cu2L2H-22+. However, for CuLH-2 the inter-conversion only takes place after opening of one of the chelate rings in a rapid protonation preequilibrium.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/hlca.19820650313
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  • 5
    Digitale Medien
    Digitale Medien
    Synthese von cis- und trans-Eninen in der Reihe der 12-und 15-Ringe (1982)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 1366-1374 
    Details
    ISSN: 0170-2041
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Synthesis of cis- and trans-Enynes in the Class of 12- and 15-membered Ring SystemsSynthesis of (E)-1-cyclododecen-3-yne (E-2a) leads to the isolation of the first trans-enyne with geometrical ring strain. E-2a isomerizes thermally to give the Z-configuration Z-2a in a very smooth reaction. For systematical investigations the 15-membered ring enynes E-5a and Z-5a were generated. They behave like openchained 1,3-enynes.
    Notizen: Die Synthese von (E)-1-Cyclododecen-3-in (E-2a) führt zur Isolierung des ersten trans-Enins mit geometrischer Ringspannung. E-2a wandelt sich thermisch leicht in die Z-Konfiguration Z-2a um. Zur systematischen Untersuchung werden die 15-Ring-Enine E-5a und Z-5a hergestellt. Sie verhalten sich wie offenkettige 1,3-Enine.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jlac.198219820713
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  • 6
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    Thin film concentrator panel development (1982)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: The development and testing of a rigid panel concept that utilizes a thin film reflective surface for application to a low-cost point-focusing solar concentrator is discussed. It is shown that a thin film reflective surface is acceptable for use on solar concentrators, including 1500 F applications. Additionally, it is shown that a formed steel sheet substrate is a good choice for concentrator panels. The panel has good optical properties, acceptable forming tolerances, environmentally resistant substrate and stiffeners, and adaptability to low to mass production rates. Computer simulations of the concentrator optics were run using the selected reflector panel design. Experimentally determined values for reflector surface specularity and reflectivity along with dimensional data were used in the analysis. The simulations provided intercept factor and net energy into the aperture as a function of aperture size for different surface errors and pointing errors. Point source and Sun source optical tests were also performed.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: JPL Parabolic Dish Solar Thermal Power Ann. Program Rev., Proc.; p 25-34
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
    Digitale Medien
    Digitale Medien
    Bromierung und Dehydrobromierung in den Seitenketten von 1,2,3-Thiadiazolen (1982)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 683-698 
    Details
    ISSN: 0170-2041
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Bromination and Dehydrobromination in the Side Chains of 1,2,3-ThiadiazolesThe bromination of 1,2,3-thiadiazoles with N-bromosuccinimide (NBS) is investigated. The monobromides 3 and 4 and the dibromides 5 and 6 can be isolated. Several methods have been used for the introduction of double bonds by the elimination of HBr. Besides the elimination products 9, 11, 12, and 14 the substitution products 10, 13, 15, 16, and 17 are obtained. A lot of regio- and stereoselectivities can be observed.
    Notizen: Bei den 1,2,3-Thiadiazolen 2a-h wird die Bromierung mit N-Bromsuccinimid (NBS) untersucht. Es können die Monobromide 3 und 4 sowie die Dibromide 5 und 6 isoliert werden. Zur Einführung von Doppelbindungen unter HBr-Abspaltung werden mehrere Verfahren geprüft. Neben den Eliminierungsprodukten 9, 11, 12 und 14 erhält man die Substitutionsprodukte 10, 13, 15, 16 und 17. Man beobachtet dabei eine Reihe von Regio- und Stereoselektivitäten.
    Zusätzliches Material: 4 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jlac.198219820408
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  • 8
    facet.materialart.
    Unbekannt
    A point focusing collector for an integrated water/power complex (1982)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: The utilization potential of the point focusing parabolic dish is identified. Its main design parameters are summarized. Performance tests and the utilization of the collector as primary energy source in a food-water-power complex are described. Process heat, heat storage, heat transfer, and cogeneration are discussed.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: JPL Parabolic Dish Solar Thermal Power Ann. Program Rev., Proc.; p 207-223
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
    Digitale Medien
    Digitale Medien
    Glycosylazide als Ausgangsbasis zur Gewinnung von Nucleosidanalogen, 2. Synthese von Tetrazol-Nucleosiden (1982)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 1870-1890 
    Details
    ISSN: 0170-2041
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Glycosyl Azides as Starting Materials for the Synthesis of Nucleoside Analogues, 2.  -  Synthesis of Tetrazole NucleosidesThe β-D-ribofuranosyl azide derivative 1 as well as the corresponding α-anomeric compound 3 yield via Staudinger reaction the same P-N-ylide 2. Treatment with alkyl isocyanates RNCO [R = CH3, (CH3)2CH, C2H5OCOCH2, (S)-C2H5OCOCH(CH3)] affords the diastereomeric carbodiimide derivatives 5 which can be transformed by HN3 regioselectively into the 1-(β-ribofuranosyl)-5-(alkylamino)tetrazole derivatives 6. Partial or total removal of the protecting groups affords the products 7a, c, d, and 7d′-d′". The β-D-mannofuranosyl azide derivative 8 is converted via the P-N-ylide 9 into the carbodiimide 10 and the aminotetrazole derivative 11. The reaction of 2 with phenyl isocyanate yields the 5-[(β- and 5-[(α-D-ribofuranosyl)amino]-1-phenyltetrazoles 18 and 19 passing the carbodiimide intermediates 12 and 13. Additionally the 1-isocyanato sugar derivatives 14 and 15 arise which provide for the formation of the products 16, 17, and 20-22. The ethyl [(β-D-ribofuranosyl)-5-tetrazolyl]acetate 23 is formed by reaction of 2 with the azide of monoethyl malonate. The preparation of the ribosyltetrazole derivatives 26 and 27 can be achieved only by preceding synthesis of the syn/anti mixture 24a/24a originating from 2 and acetyl cyanide followed by treatment with HN3. The α-ribosyliminonitrile 25 is assumed to be an intermediate.
    Notizen: Sowohl das β-D-Ribofuranosylazid 1 als auch das α-Anomere 3 liefern bei der Staudinger-Reaktion das gleiche P-N-Ylid 2. Mit Alkylisocyanaten RNCO [R - CH3, (CH3)2CH, C2H5OCOCH2 und (S)-C2H5OCOCH(CH3)] entstehen die Carbodiimidderivate als Diastereomerengemische 5, welche mit HN3 in die 1-(β-Ribofuranosyl)-5-(alkylamino)tetrazole 6 umgewandelt werden. Teilweise oder gänzliche Entfernung der Schutzgruppen führt zu den Produkten 7a, c, d und 7d′-d′". Vom β-D-Mannofuranosylazidderivat 8 aus gelangt man über das P-N-Ylid 9 zum Carbodiimidderivat 10 und schließlich zum Aminotetrazolderivat 11. Die Umsetzung von 2 mit Phenylisocyanat liefert die 5-[(β- und 5-[(α-D-Ribofuranosyl)amino]-1-phenyltetrazole 18 bzw. 19 über die Carbodiimidzwischenstufen 12 und 13. Ferner entstehen die 1-Isocyanatozuckerderivate 14 und 15, welche für die Entstehung der Folgeprodukte 16, 17 und 20-22 verantwortlich sind. Aus 2 und Malonsäure-monoethylester-azid entsteht das Nucleosidderivat 23. Die Darstellung der Ribosyltetrazole 26 und 27 aus 2 läßt sich nur mit Acetylcyanid über das syn/anti-Gemisch 24a/24a′ durch Umsetzung mit HN3 verwirklichen. Als Zwischenstufe wird das (α-Ribosylimino)nitril 25 postuliert.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jlac.198219821009
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  • 10
    facet.materialart.
    Unbekannt
    Substance P: a putative sensory transmitter in mammalian autonomic ganglia (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1982-08-20
    Beschreibung: Repetitive presynaptic stimulation elicited slow membrane depolarization in neurons of inferior mesenteric ganglia from guinea pigs. This response was not blocked by cholinergic antagonists but was specifically and reversibly inhibited by a substance P analog, (D-Pro2, D-Phe7, D-Trp9)-substance P, which also depressed the depolarization induced by exogenously applied substance P. The atropine-sensitive slow excitatory and slow inhibitory postsynaptic potentials evoked in neurons of rabbit superior cervical ganglia were not affected by the substance P analog. These and previous results provide strong support for the hypothesis that substance P or a closely related peptide is the transmitter mediating the slow depolarization. The latter may represent a sensory input from the gastrointestinal tract to neurons of the prevertebral ganglia.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jiang, Z -- Dun, N J -- Karczmar, A G -- NS15848/NS/NINDS NIH HHS/ -- RR05368/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 1982 Aug 20;217(4561):739-41.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6179162" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Action Potentials/drug effects ; Animals ; Atropine/pharmacology ; Digestive System/physiopathology ; Ganglia, Autonomic/*drug effects ; Ganglia, Sympathetic/drug effects ; Gonadotropin-Releasing Hormone/pharmacology ; Guinea Pigs ; Membrane Potentials/drug effects ; Neurotransmitter Agents ; Peptides/*pharmacology ; Rabbits ; Substance P/analogs & derivatives/*physiology ; Tubocurarine/pharmacology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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    AKTUELLE ARTIKEL
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