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  • Chemistry  (13,846)
  • 2000-2004  (484)
  • 1955-1959  (13,362)
  • 1
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2004-05-29
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Malakoff, David -- New York, N.Y. -- Science. 2004 May 28;304(5675):1283.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15166364" target="_blank"〉PubMed〈/a〉
    Keywords: Biotechnology ; Career Choice ; Chemistry ; Emigration and Immigration ; History, 20th Century ; History, 21st Century ; Siberia ; United States
    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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  • 2
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2003-05-31
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Demaine, Linda J -- Fellmeth, Aaron X -- New York, N.Y. -- Science. 2003 May 30;300(5624):1375-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉RAND, Santa Monica, CA 90401, USA. demaine@rand.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12775825" target="_blank"〉PubMed〈/a〉
    Keywords: Aluminum Oxide ; Chemical Phenomena ; Chemistry ; Natural Science Disciplines ; Patents as Topic/*legislation & jurisprudence ; Plant Extracts ; Plant Roots ; Titanium ; United States
    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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  • 3
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2002-03-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Eisner, Thomas -- Berenbaum, May -- New York, N.Y. -- Science. 2002 Mar 15;295(5562):1973.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11896239" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biochemical Phenomena ; *Biochemistry ; *Biological Factors/chemistry ; *Biology ; Chemical Phenomena ; Chemistry ; *Ecology ; Ecosystem ; *Molecular Biology ; Research Support as Topic ; United States
    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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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Accreditation and quality assurance 5 (2000), S. 409-413 
    ISSN: 1432-0517
    Keywords: Key words Metrology ; Comparisons ; Chemistry ; Standards
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  After stressing the importance in the modern world of accurate and reproducible measurements, the actions taken by the Bureau International des Poids et Mesures to set up, together with the regional metrology organizations, a series of key comparisons are described. They are the technical foundation of a mutual recognition of national measurement standards arrangement prepared in conjunction with the National Metrology Institutes (NMIs). This arrangement also includes the recognition of calibration and measurement certificates issued by these institutes. Then, the consequences of this arrangement for trade are described. The case of chemical analysis is illustrated by the application of the Kyoto protocol on the reduction of greenhouse gases. But the global workload to be taken up by the International Committee of Weights and Measures, its Consultative Committee for Amount of Substance and the NMIs is huge.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Earth, moon and planets 88 (2000), S. 35-58 
    ISSN: 1573-0794
    Keywords: Chemistry ; interplanetary dust particles (IDPs) ; Leonids ; meteor trails ; meteoroids ; meteors ; structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The cometary Leonid meteoroids represent a size range in between largest carbon-richIDPs and the smallest CI meteorites. Their dustball structure and chemistry offer anopportunity to constrain hierarchical dust accretion inferred from petrologic studies ofaggregate and cluster IDPs. The Leonid shower meteoroids of known ``comet ejection''ages provide an opportunity to study space weathering of cometary dust over periodsof up to several hundred years. The meteors and aggregate and cluster IDPs displaycontinuous thermal modification of organics and volatile element (Na, K-bearing phases), that occur as discrete minerals and amorphous solids each different response during kinetically controlled ablation. Leonid meteoroids are not excessively Na-rich. The occurrences of Leonid meteors can now be accurate predicted and combined withknowledge better models for the settling rates, collections of surviving dust becomea comet nucleus-sampling mission.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 412-415 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Comparing Exposure Tests on the Corrosion Resistance of Passivated Galvanic zinc coatingsThe results of three years exposure tests on galvanic zinc coatings passivated by 15 different methods are given. The experiments were carried out under different conditions of climate: industry, urban, country and sea climate.There were big differences between the differently passivated coatings though generally a considerable increase of the corrosion resistance could be observed. The most effectfully passivating methods are named. Further result is that there is no good agreement between exposure and accelerated tests. The results show that the most intensive corrosion takes place in industrial climate and decreases in the order urban sea and country climate. It should be mentioned that fairly no dust will be deposited on some chromate coatings. Some coatings remained glittering for longer times, open, till the basic metal was corroded. A comparison of the resistances to corrosion of the differently passivated zinc coatings is given.
    Notes: Die Ergebnisse dreijähriger Feldversuche von galvanischen Zinküberzügen, die nach fünfzehn verschiedenen Verfahren passiviert worden waren, wurden bekanntgegeben. Die Versuche wurden unter verschiedenen Klimaverhältnissen: Industrie-, Stadt-, Land- und Seeklima, durchgeführt.Es wurde festgestellt, daß zwischen den in verschiedenen Bädern passiovierten Überzügen große Unterschiede bestehen in Bezug auf die Korrosionsbeständigkeit. In den meisten Fällen wurde eine bedeutende Verbesserung der Korrosions-beständigkeit beobachtet. Die Passivierungsbäder, welche die Korrosionsbeständigkeit der Zinküberzüge besonders steigern, wurden angegeben. Allgemein wurde festgestellt, daß nur ein loser Zusammenhang zwischen den Ergebnissen der Feld und Schnellversuche besteht. Die Ergebnisse zeigen, daß bei den passivierten Zinküberzügen die stärkste Korrosion im Industrieklima eintritt und dann in der Reihenfolge Stadt-, See-, und Landklima abnimmt. Man bemerkte auch, daß sich auf einigen Chromatüberzügen kaum Schmutz niederschlägt. Manche der Überzüge behielten ihren Glanz längere Zeit, oft bis zum Auftreten der Korrosion des Grundmetalls. Ein Vergleich der Korrosionsbeständigkeit der in verschiedenen Bädern passivierten Zinküberzügen wurde angegeben.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The Electro Chemical Behavior of Bimetallic Electrodes and the Application of their Overpotential Curves in Corrosion ResearchA two phase electrode with local cells on its anodic and cathodic surfaces is put into an extern circuit. The polarization voltage depends on (a)the situation and size of the local cell surfaces,(b)the anodic and cathodic processes on the local electrodes,(c)the direction and the current density of the extern current and(d)the situation of the tip of the reference electrode in the solution.The facts nzcntioned above are the basis for an investigation of current doisity-voltage curves of electrodes which are corroded by local currents.
    Notes: Eine Zweiphasenelektrode mit Lokal-elementanbildung auf ihren Anoden-und Kathodenflächen wird in einem äußeren Stromkreis eingebaut; die Messung der Polarisationsspannung hängt ab von: (a)Lage und Größe der Lokalelementflächen(b)Anoden- und Kathodenvorgängen auf den Lokalelektroden(c)Richtung und Stärke des außen angelegten Stromes und(d)Lage des Abzapfpunktes der Bezugselektrode in der Lösung.Die Erörterung der Tatsachen bildet die Grundlage zur Untersuchung von Strom. Spannungskurven von Elektroden, die bei Korrosionsvorgängen durch Lokalströme erhalten werden.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 461-466 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 455-460 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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