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  • Polymer and Materials Science  (13,298)
  • Inorganic Chemistry  (3,763)
  • Fisheries
  • 2000-2004  (27)
  • 1975-1979  (17,063)
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  • 1
    Publication Date: 2004-11-13
    Description: The multibillion-dollar trade in bushmeat is among the most immediate threats to the persistence of tropical vertebrates, but our understanding of its underlying drivers and effects on human welfare is limited by a lack of empirical data. We used 30 years of data from Ghana to link mammal declines to the bushmeat trade and to spatial and temporal changes in the availability of fish. We show that years of poor fish supply coincided with increased hunting in nature reserves and sharp declines in biomass of 41 wildlife species. Local market data provide evidence of a direct link between fish supply and subsequent bushmeat demand in villages and show bushmeat's role as a dietary staple in the region. Our results emphasize the urgent need to develop cheap protein alternatives to bushmeat and to improve fisheries management by foreign and domestic fleets to avert extinctions of tropical wildlife.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Brashares, Justin S -- Arcese, Peter -- Sam, Moses K -- Coppolillo, Peter B -- Sinclair, A R E -- Balmford, Andrew -- New York, N.Y. -- Science. 2004 Nov 12;306(5699):1180-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Conservation Biology Group, Department of Zoology, University of Cambridge, Cambridge CB2 3EJ, UK. brashares@nature.berkeley.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15539602" target="_blank"〉PubMed〈/a〉
    Keywords: Agriculture ; Animals ; *Animals, Wild ; Biodiversity ; Biomass ; Commerce ; Conservation of Natural Resources ; Fisheries ; *Fishes ; *Food Supply ; Ghana ; Humans ; *Mammals ; *Meat ; Population Density ; Population Dynamics
    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: 2004-08-31
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Grimm, David -- New York, N.Y. -- Science. 2004 Aug 27;305(5688):1235.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15333821" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biodiversity ; *Ecosystem ; Fisheries ; *Fishes ; Humans ; Population Density ; *Recreation ; 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
    Publication Date: 2004-09-14
    Description: It is now widely accepted that global warming is occurring, yet its effects on the world's largest ecosystem, the marine pelagic realm, are largely unknown. We show that sea surface warming in the Northeast Atlantic is accompanied by increasing phytoplankton abundance in cooler regions and decreasing phytoplankton abundance in warmer regions. This impact propagates up the food web (bottom-up control) through copepod herbivores to zooplankton carnivores because of tight trophic coupling. Future warming is therefore likely to alter the spatial distribution of primary and secondary pelagic production, affecting ecosystem services and placing additional stress on already-depleted fish and mammal populations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Richardson, Anthony J -- Schoeman, David S -- New York, N.Y. -- Science. 2004 Sep 10;305(5690):1609-12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Sir Alister Hardy Foundation for Ocean Science, The Laboratory, Citadel Hill, Plymouth, PL1 2PB, UK. anr@sahfos.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15361622" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Atlantic Ocean ; *Climate ; Copepoda/*growth & development ; *Ecosystem ; Fisheries ; Fishes ; *Food Chain ; Greenhouse Effect ; Meta-Analysis as Topic ; Phytoplankton/*growth & development ; Population Dynamics ; Seawater ; Temperature ; Zooplankton/*growth & development
    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
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2004-08-25
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Proffitt, Fiona -- New York, N.Y. -- Science. 2004 Aug 20;305(5687):1090.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15326320" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Birds/*physiology ; *Ecosystem ; *Eels ; Fisheries ; Food Chain ; North Sea ; Plankton ; Population Density ; *Reproduction ; Scotland ; Seawater ; Temperature
    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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  • 5
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2004-06-26
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wright, Bruce A -- Okey, Thomas A -- New York, N.Y. -- Science. 2004 Jun 25;304(5679):1903.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15218125" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Conservation of Natural Resources ; *Ecosystem ; *Environment ; Fisheries ; Humans ; Information Dissemination ; Population Growth ; Public Policy
    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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  • 6
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2004-08-25
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Allison, Edward H -- Seeley, Janet A -- New York, N.Y. -- Science. 2004 Aug 20;305(5687):1104.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15326332" target="_blank"〉PubMed〈/a〉
    Keywords: Asia/epidemiology ; Female ; Fisheries ; HIV Infections/*epidemiology/transmission ; Humans ; Male ; Occupations ; Prevalence ; Sexual Partners ; *Transients and Migrants
    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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  • 7
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2004-07-27
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rembold, Christopher M -- New York, N.Y. -- Science. 2004 Jul 23;305(5683):475; author reply 475.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15273376" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Coronary Artery Disease/mortality/*prevention & control ; *Diet ; Environmental Pollutants/toxicity ; Fatty Acids, Omega-3/*administration & dosage ; Fisheries ; *Food Contamination ; Humans ; Neoplasms/chemically induced/epidemiology ; Randomized Controlled Trials as Topic ; Risk Assessment ; *Salmon ; Toxicity Tests
    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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  • 8
    Publication Date: 2004-09-14
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stokstad, Erik -- New York, N.Y. -- Science. 2004 Sep 10;305(5690):1548-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15361593" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Atlantic Ocean ; *Climate ; *Ecosystem ; Fisheries ; *Food Chain ; Phytoplankton/*growth & development ; Population Dynamics ; Seawater ; Temperature ; Zooplankton/*growth & development
    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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  • 9
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2003-10-11
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stone, Richard -- New York, N.Y. -- Science. 2003 Oct 10;302(5643):221-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14551417" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Ecosystem ; *Eels/growth & development/physiology ; Fisheries ; Fresh Water ; Oceans and Seas ; Population Density ; Reproduction ; Seawater
    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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  • 10
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2003-08-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Malakoff, David -- New York, N.Y. -- Science. 2003 Aug 22;301(5636):1034-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12933987" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Anthozoa ; Atlantic Ocean ; Conservation of Natural Resources ; *Ecosystem ; Environment ; Fisheries ; *Fishes ; Geologic Sediments ; *Marine Biology ; Pacific Ocean ; *Seawater
    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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  • 11
    Publication Date: 2003-07-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sanchirico, James N -- Stoffle, Richard -- Broad, Kenny -- Talaue-McManus, Liana -- New York, N.Y. -- Science. 2003 Jul 4;301(5629):47-9; author reply 47-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12843376" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; California ; *Conservation of Natural Resources ; *Ecosystem ; Fisheries ; *Fishes ; Humans ; Seawater
    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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  • 12
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2003-04-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Service, Robert F -- New York, N.Y. -- Science. 2003 Apr 4;300(5616):36-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12677035" target="_blank"〉PubMed〈/a〉
    Keywords: Agriculture ; Animals ; California ; *Conservation of Natural Resources ; *Cypriniformes/physiology ; *Ecology ; Ecosystem ; Environment ; Fisheries ; *Fresh Water ; Government Agencies ; National Academy of Sciences (U.S.) ; *Oncorhynchus kisutch/physiology ; Oregon ; United States ; Water Movements
    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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  • 13
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2003-05-10
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zimmer, Carl -- New York, N.Y. -- Science. 2003 May 9;300(5621):895.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12738833" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Breeding ; *Conservation of Natural Resources ; Environment ; Fisheries ; *Fishes/genetics/growth & development/physiology ; Plant Development ; Reproduction ; *Selection, Genetic ; Sexual Maturation
    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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  • 14
    Publication Date: 2003-08-30
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Webster, Paul -- New York, N.Y. -- Science. 2003 Aug 29;301(5637):1167.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12947169" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Conservation of Natural Resources/economics ; *Ecosystem ; *Environment ; Financial Support ; Fisheries ; Fresh Water ; Pacific Ocean ; Russia ; *Salmon ; United Nations/economics
    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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  • 15
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2002-08-07
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ajayi, Thomas -- Sherman, Kenneth -- Tang, Qisheng -- New York, N.Y. -- Science. 2002 Aug 2;297(5582):772.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12162321" target="_blank"〉PubMed〈/a〉
    Keywords: Biomass ; Conservation of Natural Resources/*economics/*methods/trends ; *Ecosystem ; Europe ; Fisheries ; International Cooperation ; *Marine Biology/economics/trends ; North America ; Water Pollution/prevention & control
    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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  • 16
    Publication Date: 2002-12-10
    Description: There is debate concerning the most effective conservation of marine biodiversity, especially regarding the appropriate location, size, and connectivity of marine reserves. We describe a means of establishing marine reserve networks by using optimization algorithms and multiple levels of information on biodiversity, ecological processes (spawning, recruitment, and larval connectivity), and socioeconomic factors in the Gulf of California. A network covering 40% of rocky reef habitat can fulfill many conservation goals while reducing social conflict. This quantitative approach provides a powerful tool for decision-makers tasked with siting marine reserves.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sala, Enric -- Aburto-Oropeza, Octavio -- Paredes, Gustavo -- Parra, Ivan -- Barrera, Juan C -- Dayton, Paul K -- New York, N.Y. -- Science. 2002 Dec 6;298(5600):1991-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Marine Biodiversity and Conservation, Scripps Institution of Oceanography, La Jolla, CA 92093, USA. esala@ucsd.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12471258" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; California ; Computer Simulation ; *Conservation of Natural Resources ; *Ecosystem ; Environment ; Fisheries ; Fishes ; Invertebrates ; *Models, Biological ; *Seawater
    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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  • 17
    Publication Date: 2001-08-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Magnuson, J J -- Safina, C -- Sissenwine, M P -- New York, N.Y. -- Science. 2001 Aug 17;293(5533):1267-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Limnology, University of Wisconsin, Madison, WI 53706, USA. jmagnuson@mhub.limnology.wisc.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11509715" target="_blank"〉PubMed〈/a〉
    Keywords: Animal Identification Systems ; Animals ; Atlantic Ocean ; *Behavior, Animal ; Body Temperature ; *Conservation of Natural Resources ; Diving ; *Ecosystem ; Fisheries ; Population Dynamics ; Reproduction ; Swimming ; Tuna/genetics/*physiology
    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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  • 18
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-03-20
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Malakoff, D -- New York, N.Y. -- Science. 2001 Jan 12;291(5502):227-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11253825" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Fisheries ; *Homing Behavior ; Isotopes ; Otolithic Membrane/*chemistry ; Perciformes/*physiology ; Population Dynamics ; Reproduction ; 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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  • 19
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-02-24
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Collie, J -- Saila, S -- Walters, C -- Carpenter, S -- New York, N.Y. -- Science. 2000 Nov 3;290(5493):933-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11184733" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Conservation of Natural Resources ; *Ecosystem ; Fisheries ; Fresh Water ; Government Agencies ; Models, Biological ; Northwestern United States ; Population Dynamics ; *Salmon/physiology
    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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  • 20
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-07-28
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zimmer, C -- New York, N.Y. -- Science. 2001 Jul 27;293(5530):627-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11474097" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Cnidaria ; *Ecosystem ; Eutrophication ; Fisheries ; International Cooperation ; Israel ; Jordan ; Marine Biology ; Oceans and Seas ; Time Factors ; United States
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    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 21
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-02-24
    Description: Using a novel technique, described on page 795, paleoceanographers have been able to chart the abundance of sockeye salmon in the Bristol Bay and Kodiak Island regions of Alaska over the past 300 years--by far the most complete record yet. Through time, they found, sockeye populations have alternately soared and slipped, following natural climate variations--well before commercial fishers began throwing nets over the sides of boats.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Brown, K -- New York, N.Y. -- Science. 2000 Oct 27;290(5492):685-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11184190" target="_blank"〉PubMed〈/a〉
    Keywords: Alaska ; Animals ; *Climate ; *Ecosystem ; Fisheries ; Fresh Water ; Geologic Sediments/chemistry ; Nitrogen Isotopes/analysis ; Pacific Ocean ; Salmon/*physiology ; Temperature
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    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 22
    Publication Date: 2001-08-18
    Description: The deployment of electronic data storage tags that are surgically implanted or satellite-linked provides marine researchers with new ways to examine the movements, environmental preferences, and physiology of pelagic vertebrates. We report the results obtained from tagging of Atlantic bluefin tuna with implantable archival and pop-up satellite archival tags. The electronic tagging data provide insights into the seasonal movements and environmental preferences of this species. Bluefin tuna dive to depths of 〉1000 meters and maintain a warm body temperature. Western-tagged bluefin tuna make trans-Atlantic migrations and they frequent spawning grounds in the Gulf of Mexico and eastern Mediterranean. These data are critical for the future management and conservation of bluefin tuna in the Atlantic.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Block, B A -- Dewar, H -- Blackwell, S B -- Williams, T D -- Prince, E D -- Farwell, C J -- Boustany, A -- Teo, S L -- Seitz, A -- Walli, A -- Fudge, D -- New York, N.Y. -- Science. 2001 Aug 17;293(5533):1310-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Tuna Research and Conservation Center, Stanford University, Hopkins Marine Station, Oceanview Boulevard, Pacific Grove, CA 93950, USA. bblock@stanford.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11509729" target="_blank"〉PubMed〈/a〉
    Keywords: Animal Identification Systems ; Animals ; Atlantic Ocean ; *Behavior, Animal ; Body Temperature ; Conservation of Natural Resources ; Diving ; *Ecosystem ; Female ; Fisheries ; Male ; Reproduction ; Seasons ; Swimming ; Temperature ; Tuna/*physiology
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    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 23
    Electronic Resource
    Electronic Resource
    Springer
    Agriculture and human values 17 (2000), S. 125-139 
    ISSN: 1572-8366
    Keywords: Environment ; Fisheries ; Fordism ; Nation-State ; Regulation ; Supranational State ; Transnational corporations ; Transnational State
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract This analysis uses an analytical frameworkgrounded in political economy perspectives of theglobalization of the agro-food sector combined with acase study approach focusing on the Marine StewardshipCouncil (MSC) to inform discussions regarding thecharacteristics of societal regulation in thepost-Fordist era. More specifically, this analysisuses the case of the emergence of the MSC toinvestigate propositions regarding the existence of,and location of, nascent forms of a transnationalState. The MSC proposes to regulate the certificationof sustainable fisheries at the global level throughan eco-labeling program. The MSC was created in 1996by the transnational environmental organization theWorld Wildlife Fund and the transnational corporationUnilever. The emergence of the MSC has generatedheated discussion in fisheries management circles thatis in general divided along North/South lines. Thisanalysis indicates that the case of the MSC providesvaluable insights into the possible characteristics ofsupranational regulatory mechanisms that might emulatethe role of the nation-State in the post-Fordist era.
    Type of Medium: Electronic Resource
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  • 24
    Electronic Resource
    Electronic Resource
    Springer
    Environment, development and sustainability 2 (2000), S. 277-304 
    ISSN: 1573-2975
    Keywords: Systems of Knowledge ; Local Knowledge ; Fisheries ; Resource Management
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Sociology
    Notes: Abstract During the last 20 years, the existence of rich systems of local knowledge, and their vital support to resource use and management regimes, has been demonstrated in a wide range of biological, physical and geographical domains, such as agriculture, animal husbandry, forestry and agroforestry, medicine, and marine science and fisheries. Local knowledge includes empirical and practical components that are fundamental to sustainable resource management. Among coastal-marine fishers, for example, regular catches and, often, long-term resource sustainment are ensured through the application of knowledge that encompasses empirical information on fish behaviour, marine physical environments, fish habitats and the interactions among ecosystem components, as well as complex fish taxonomies. Local knowledge is therefore an important cultural resource that guides and sustains the operation of customary management systems. The sets of rules that compose a fisheries management system derive directly from local concepts and knowledge of the resources on which the fishery is based. Beyond the practical and the empirical, it is essential to recognise the fundamental socio-cultural importance of local knowledge to any society. It is through knowledge transmission and socialisation that worldviews are constructed, social institutions perpetuated, customary practices established, and social roles defined. In this manner, local knowledge and its transmission, shape society and culture, and culture and society shape knowledge. Local knowledge is of great potential practical value. It can provide an important information base for local resources management, especially in the tropics, where conventionally-used data are usually scarce to non-existent, as well as providing a shortcut to pinpoint essential scientific research needs. To be useful for resources management, however, it must be systematically collected and scientifically verified, before being blended with complementary information derived from Western-based sciences. But local knowledge should not be looked on with only a short-term utilitarian eye. Arguments widely accepted for conserving biodiversity, for example, are also applicable to the intellectual cultural diversity encompassed in local knowledge systems: they should be conserved because their utility may only be revealed at some later date or owing to their intrinsic value as part of the world's global heritage. At least in cultures with a Western liberal tradition, more than lip-service is now being paid to alternative systems of knowledge. The denigration of alternative knowledge systems as backward, inefficient, inferior, and founded on myth and ignorance has recently begun to change. Many such practices are a logical, sophisticated and often still-evolving adaptation to risk, based on generations of empirical experience and arranged according to principles, philosophies and institutions that are radically different from those prevailing in Western scientific circles, and hence all-but incomprehensible to them. But steadfastly held prejudices remain powerful. In this presentation I describe the 'design principles' of local knowledge systems, with particular reference to coastal-marine fishing communities, and their social and practical usefulness. I then examine the economic, ideological and institutional factors that combine to perpetuate the marginalisation and neglect of local knowledge, and discuss some of the requirements for applying local knowledge in modern management.
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2000-08-19
    Description: At a press conference on 27 July, the National Marine Fisheries Service (NMFS) released a long-awaited plan to save the Columbia River's endangered salmon by restoring fish habitat, overhauling hatcheries, limiting harvest, and improving river flow. What the plan did not do, however, was call for immediate breaching of four dams on the Snake River, the Columbia's major tributary--an option that has been the subject of a nationwide environmental crusade. The NMFS will hold that option in abeyance while it sees whether the less drastic measures will do the trick. Responses from both sides were immediate and outraged.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mann, C C -- Plummer, M L -- New York, N.Y. -- Science. 2000 Aug 4;289(5480):716-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10950712" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Conservation of Natural Resources ; *Ecosystem ; Fisheries ; Fresh Water ; Government Agencies ; Northwestern United States ; *Salmon
    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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    Publication Date: 2000-10-29
    Description: The effects of climate variability on Pacific salmon abundance are uncertain because historical records are short and are complicated by commercial harvesting and habitat alteration. We use lake sediment records of delta15N and biological indicators to reconstruct sockeye salmon abundance in the Bristol Bay and Kodiak Island regions of Alaska over the past 300 years. Marked shifts in populations occurred over decades during this period, and some pronounced changes appear to be related to climatic change. Variations in salmon returns due to climate or harvesting can have strong impacts on sockeye nursery lake productivity in systems where adult salmon carcasses are important nutrient sources.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Finney, B P -- Gregory-Eaves, I -- Sweetman, J -- Douglas, M S -- Smol, J P -- New York, N.Y. -- Science. 2000 Oct 27;290(5492):795-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Marine Science, University of Alaska Fairbanks, Fairbanks, AK 99775, USA. finney@ims.uaf.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11052941" target="_blank"〉PubMed〈/a〉
    Keywords: Alaska ; Animals ; *Climate ; Diatoms ; *Ecosystem ; Fisheries ; Fresh Water ; Geologic Sediments/chemistry ; Industry ; Nitrogen Isotopes/analysis ; Pacific Ocean ; Plankton ; Salmon/*physiology ; Temperature
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2000-05-08
    Description: Fish faunas across the continental United States have become more similar through time because of widespread introductions of a group of cosmopolitan species intended to enhance food and sport fisheries. On average, pairs of states have 15.4 more species in common now than before European settlement of North America. The 89 pairs of states that formerly had no species in common now share an average of 25.2 species. Introductions have played a larger role than extirpations in homogenizing fish faunas. Western and New England states have received the most introductions, which is a reflection of the small number of native fishes in these areas considered desirable gamefish by settlers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rahel, F J -- New York, N.Y. -- Science. 2000 May 5;288(5467):854-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Zoology and Physiology, University of Wyoming, Laramie, WY 82071, USA. frahel@uwyo.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10797007" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Ecosystem ; Fisheries ; *Fishes ; Species Specificity ; 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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    Environmental management 3 (1979), S. 133-144 
    ISSN: 1432-1009
    Keywords: Coastal zone Management ; Fisheries ; Marshes ; Wetlands ; Louisiana
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract This paper examines causes and consequences of wetland losses in coastal Louisiana. Land loss is a cumulative impact, the result of many impacts both natural and artificial. Natural losses are caused by subsidence, decay of abandoned river deltas, waves, and storms. Artificial losses result from flood-control practices, impoundments, and dredging and subsequent erosion of artificial channels. Wetland loss also results from spoil disposal upon wetlands and land reclamation projects. Total land loss in Louisiana's coastal zone is at least 4,300 ha/year. Some wetlands are converted to spoil banks and other eco-systems so that wetland losses are probably two to three times higher. Annual wetland losses in the Barataria Bay basin are 2.6% of the wetland area. Human activities are the principal determinants of land loss. The present total wetland area directly lost because of canals may be close to 10% if spoil area is included. The interrelationship between hydrology, land, vegetation, substrate, subsidence, and sediment supply are complicated; however, hydrologic units with high canal density are generally associated with higher rates of land loss and the rate may be accelerating. Some cumulative impacts of land loss are increased saltwater intrusion, loss of capacity to buffer the impact of storms, and large additions of nutrients. One measure of the impact is that roughly $8–17 × 106 (U.S.A.) of fisheries products and services are lost annually in Louisiana. Viewed at the level of the hydrologic unit, land loss transcends differences in local vegetation, substrate, geology, and hydrology. Land management should therefore focus at that level of organization. Proper guideline recommendations require an appreciation of the long-term interrelations of the wetland estuarine system.
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979) 
    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
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 1-8 
    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: Ermittlung von Potentialbereichen der Anfälligkeit für Spannungsrißkorrosion durch elektrochemische Messungen sowie durch Spannungsrißkorrosionsversuche mit konstanter Dehngeschwindigkeit und konstanter LastDie Ermittlung kritischer Potentialbereiche der Anfälligkeit von Werkstoffen für Spannungsrißkorrosion (SpRK) ist sowohl für die Voraussage möglicher Korrosionsschäden infolge von SpRK als auch für den anodischen oder kathodischen Korrosionsschutz von großer praktischer Bedeutung. Hierzu wurde im Schrifttum ein Kurzzeit-Prüfverfahren beschrieben, welches auf der Vorstellung beruht, daß kritische Potentialbereiche der SpRK durch stärkere Unterschiede im Verlauf von stationär und nichtstationär gemessenen Strom-Potential-Kurven gekennzeichnet sind.Die Gültigkeit dieser Vorstellung wurde für zwei Systeme untersucht: (a) 18/8 Chrom-Nickel-Stahl/siedende 42%ige Magnesiumchlorid-Lösung und (b) niedriglegierter Kohlenstoff-Mangan-Stahl/3 M Na2CO3-Lösung (40 bis 70 °C). Versuchsergebnisse wurden erhalten aus (a) potentiodynamisch mit niedriger und hoher Potentialänderungsgeschwindigkeit gemessenen Strom-Potential-Kurven; (b) SpRK-Versuchen unter konstanter Last und (c) SpRK-Versuchen unter konstanter Dehnungsgeschwindigkeit. Die SpRK-Versuche wurden unter potentiostatischer Kontrolle durchgeführt und die geprüften Proben anschließend an die Versuche sorgfältig metallografisch untersucht.Aus den Versuchsergebnissen ist zu schließen, daß Unterschiede im Verlauf von mit niedriger und hoher Potentialänderungsgeschwindigkeit gemessenen Strom-Potential-Kurven keine notwendige Voraussetzung für das Auftreten von SpRK sind. Sie können zwar möglicherweise Hinweise für Versuchsbedingungen geben, unter denen SpRK erwartet werden kann, jedoch sind derartige Versuche kein Ersatz für herkömmliche Untersuchungsverfahren zum Ermitteln einer Anfälligkeit von Werkstoffen für SpRK.
    Notes: For the prediction of possible failures due to SCC as well as for corrosion prevention by anodic or cathodic protection, the evaluation of critical potential ranges for susceptibility to SCC is of great practical importance. For this purpose, accelerated testing techniques have been described in the literature basing on the conception that critical potential ranges for SCC are characterized by marked differences of the slope of the stationary and nonstationary measured current-potential-curves.The validity of this conception was investigated for two systems: (i) 18/8 stainless steel/boiling 42% MgCl2 and (ii) low-alloy C-Mn-steel/3M Na2CO3 (40 to 70 °C). Experimental data were obtained by (i) potentiodynamically with high and low potential sweep rates measured current-potential-curves; (ii) constant-load and (iii) constant strain rate SCC experiments. The SCC experiments were run under potentiostatic control and followed by careful metallografic investigation of the specimens.From the experimental results one has to conclude that differences in the slope of the current-potential-curves measured with variable, high and low potential sweep rates, are no necessary precondition for the occurence of SCC. Possibly they can give indication for experimental conditions under which SCC might be expected, but they are no substitute for conventional test methods to investigate susceptibility of materials to SCC.
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 34-37 
    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: Importance of ions of strong acids and bases for the corrosion of coated and uncoated unalloyed steelsNeutral salts can deteriorate the formation of protective layers in water. Furthermore, formation of corrosion cells due to different pH-values is possible. Low pH-values and anodes resp. high pH-values and cathodes are related to reactions of the ions of strong acids resp. strong bases. Similar reactions are responsible for blistering of coated steel being anodically or cathodically polarized.
    Notes: Neutralsalze beeinträchtigen die Schutzschichtbildung in neutralen Wässern. Ferner ermöglichen sie die Ausbildung von Korrosionselementen durch Unterschiede im pH-Wert. Niedrige pH-Werte und Lokalanoden bzw. hohe pH-Werte und Lokalkathoden sind an die Gegenwart der Ionen starker Säuren bzw. Basen gebunden. In gleicher Weise erzeugen diese Ionen auch Blasen in Beschichtungen bei anodischer oder kathodischer Belastung.
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 9-34 
    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: Influence of pH-value, oxygen content and flow velocity of cold drinking water on corrosion behaviour and surface layer forming of galvanized steel tubesDuring a test program of 28 months determinations of weight loss, metallographical examinations and chemical analysis data of surface layers showed clearly that in the chosen variation range mainly the pH is important for the longterm behaviour and the expected working life of galvanized steel tubes. Lower pH-values of 6.9 lead to increased rates of Zinc attack and to inhomogene, disturbed surface layers, whereas higher pH-values of 7.9 show decreased Zinc loss and favour the forming of well protecting layers. Oxygen content and flow velocity become important only in the early stage of Zinc corrosion. Additional electrochemical measurements gave a good impression of Zinc corrosion rate development, corrosion attack morphology and properties of surface layers.
    Notes: Im Verlauf eines 28monatigen Versuchsprogramms zeigten Bestimmungen des Massenverlustes, metallographische und Deckschichtuntersuchungen, daß im Rahmen der gewählten Variationsbreite hauptsächlich der pH-Wert für das langfristige Verhalten und die zu erwartende Lebensdauer feuerverzinkter Stahlrohre von Bedeutung ist. Niedrige pH-Werte von 6,9 führen zu schnellem Zinkabtrag und schlecht schützenden Deckschichten, während erhöhte pH-Werte von 7,9 neben geringeren Korrosionsraten die Ausbildung wirksamer Schutzschichten begünstigen. Sauerstoffgehalt und Strömungsgeschwindigkeit spielen nur eine untergeordnete Rolle in der Anfangsphase der Zinkkorrosion. Durch ergänzende elektrochemische Messungen konnte ein qualitativer überblick über den Verlauf des Zinkabtrags, die Form des Korrosionsangriffs und die Eigenschaften der sich bildenden Deckschichten gewonnen werden.
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 46-49 
    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
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 50-54 
    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
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 43-46 
    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 influence of hydrogen sulphide on the corrosion of iron in acid solutionsA considerable change of the polarisation behaviour of iron electrodes in acidic perchlorate and sulphate solutions was observed if they where saturated with hydrogen sulfide gas. H2S markedly increased the anodic current densities and increases the corrosion rates by a factor of ten. The anodic Tafel slopes d log iA/dE are only about half as steep as those in the absence of hydrogen sulphide. It is probable that the SH--ions behave as catalysts of the iron dissolution reaction in a similar manner as the OH--ions, but are adsorbed almost to saturation.
    Notes: An Eisenelektroden wurden in angesäuerten Perchlorat und Sulfatlösungen nach Einleiten von Schwefelwasserstoff erheblich veränderte Stromdichte-Potentialkurven beobachtet. Gegenüber den reinen Lösungen ergeben sich mit Schwefelwasserstoff stark erhöhte anodische Stromdichten und bis um den Faktor 10 erhöhte Korrosionsgeschwindigkeiten. Dabei sind die anodischen Tafelgeraden log iA = f (E) mit H2S nur rund halb so steil wie ohne H2S. Wahrscheinlich wirken die SH--Ionen ähnlich wie die OH--Ionen als Katalysator der Eisenauflösung, sind aber bis fast zur Sättigung absorbiert.
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 38-42 
    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: Korrosionsgeschwindigkeit, Betauungsdauer und relative Feuchtigkeit bei atmosphärischer KorrosionDer Einfluß der relativen Feuchtigkeit auf die Geschwindigkeit der atmosphärischen Korrosion wurde im Laboratorium mit rostbedecktem Stahl in Luft und Luft + 1 ppm Schwefeldioxid untersucht. Die Gleichung \documentclass{article}\pagestyle{empty}\begin{document}$$ \log {\rm\; r = log\; r}_{{\rm crit}} + {\rm b''}\left({\frac{{{\rm RH } - {\rm RH}_{{\rm crit}} }}{{100 - {\rm RH}_{{\rm crit}} }}} \right) $$\end{document} beschreibt die experimentellen Ergebnisse. Dabei ist rcrit die Korrosionsgeschwindigkeit bei der kritischen Relativitätsfeuchte RHcrit und b″ ist die normierte Korrosionsgeschwindigkeit bei 100% relativer Feuchtigkeit. Während der Einfluß von Natriumchlorid als Verunreinigung im Rost ziemlich groß ist, konnte keine Wirkung des Schwefeldioxids nachgewiesen werden. Die Betauungsdauer wurde bei Freibewitterung unter Verwendung eines früher beschriebenen „atmospheric corrosion monitor“ bestimmt. Dabei wurde festgestellt, daß bei Bewitterung in Thousand Oaks, Cal., die Betauungsdauer RH 40% entspricht.
    Notes: The effect of relative humidity (RH) on atmospheric corrosion rates r has been studied in laboratory experiments for rust covered steel in air and air + 1 ppm SO2. The expression: \documentclass{article}\pagestyle{empty}\begin{document}$$ \log {\rm\; r = log\; r}_{{\rm crit}} + {\rm b''}\left({\frac{{{\rm RH } - {\rm RH}_{{\rm crit}} }}{{100 - {\rm RH}_{{\rm crit}} }}} \right) $$\end{document} describes the experimental results, where rcrit is the corrosion rate at the critical relative humidity RHcrit and b″ is the normalized corrosion rate at RH = 100%. While a large effect of NaCl impurities in rust was found, no effect of SO2 was observed. Time-of-wetness was determined in outdoor exposure using the previously described atmospheric corrosion monitor (ACM). It was found that for exposure at a site in Thousand Oaks, California, the time-of-wetness corresponds to RH 〉 40%.
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 54-64 
    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
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 65-66 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 66-69 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 69-77 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 77-83 
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 83-84 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 84-85 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 85-86 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 86-87 
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 87-88 
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 89-89 
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 89-89 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
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    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979) 
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    Keywords: Chemistry ; Polymer and Materials Science
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    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 91-100 
    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: Corrosion in Alkali Metal Circuits. II - Test MethodsThe test apparatus for liquid alkali metal corrosion studies of metallic materials are described. The relations between the problems to be studied and the test methods are discussed. Simple and cheap test rigs cause the restriction to stagnant melts and low temperature gradients. However, interesting results can be gained, particularly if the test pots contain instruments. Mock-up tests of technologic problems demand for control and measurement of the most important parameters as flow velocity, temperature gradients, and purity of the melt, if the results should be of value for technical use. The circuits used for this type of experiments can contain up to tons of the alkali metal melts. They may be highly expensive in this case. The experiences gained in the liquid alkali metals experimental techniques may be introduced for corrosion studies in other liquid metals.
    Notes: Die zur Untersuchung der Korrosion durch flüssige Alkalimetalle an metallischen Werkstoffen gebräuchlichen Versuchsaufbauten werden beschrieben und ihre Beziehungen zu den Fragstellungen der Versuche diskutiert. Einfache und billige Versuchsaufbauten bedingen stagnierende Metallschmelzen und nur kleine Temperaturgradienten, lassen aber vor allem in instrumentierten Behältern durchaus interessante Versuchsergebnisse erwarten. Für anwendungsnahe Untersuchungen müssen die technisch wichtigen Parameter wie Strömungsgeschwindigkeit, Temperaturgradienten und Reinheit der Schmelzen einstellbar und meßbar sein, will man auf die Technik übertragbare Ergebnisse erhalten. Die für solche Versuche üblichen Kreisläufe können bis zu Tonnen der Metallschmelzen aufnehmen und sehr aufwendig werden. Aus den hier gewonnenen Erfahrungen lassen sich Korrosionsuntersuchungen in anderen Metallschmelzen in ihrer Versuchstechnik befruchten.
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 100-104 
    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: Oxidation eines 18/8 Stahls in KohlendioxidDas Oxidationsverhalten von 18/8-Stahl wurde im Temperaturbereich 873-1258K (600-985°C) durch kontinuierliche Messung der Gewichtszunahme, metallographische Methoden und Rasterelektronenmikroskopie untersucht. Auf eine anfänglich hohe Oxidationsgeschwindigkeit folgt eine Periode mit wesentlich geringerer Oxidation. Im Anfangsstadium entsteht ein zweischichtiger Zunder. weshalb die Abnahme der Oxidationsgeschwindigkeit wahrscheinlich durch die Bildung eines geordneten, chromreichen Spinells an der Grenzfläche Oxid/Metall bedingt sein dürfte.Wenn unter Verwendung des Modells von Hales die Bildung von „heilenden„ Phasen berücksichtigt wurde, ergab sich eine echte parabolische Zeitkonstante: \documentclass{article}\pagestyle{empty}\begin{document}$$ k_p = {\rm 1}{ .8\,\, exp}\left({\frac{{ - {\rm 230}}}{{RT}}} \right)g^2\,\, cm^{ - 4} \,\,\sec ^{ - 1} $$\end{document}Hierin ist die Aktivierungsenergie in KJ. mol-1 (55 kcal · mol-1) ausgedrückt.
    Notes: The oxidation behaviour of an 18/8 type stainless steel has been studied in the temperature range 873-1258 K (600-985 °C) by continous weight gain measurements, metallography and scanning electron microscopy. An initial high oxidation rate was followed by a much slower rate. Duplex scales formed at an early stage of oxidation and the decrease in oxidation rate is probably due to the formation of an ordered chromium rich spinel at the oxide/metal interface.A ture parabolic rate constant (kp) was obtained taking into account the formation of the “healing” phase using the Hales model. This gave: \documentclass{article}\pagestyle{empty}\begin{document}$$ k_p = {1.8\,\, exp}\left({\frac{{ - {\rm 230}}}{{RT}}} \right)g^2\,\, cm^{ - 4} \,\,\sec ^{ - 1} $$\end{document}. where the activation energy is expressed in KJ · mole-1. (55 Kcals mole-1).
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 105-113 
    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: Korrelation von elektrochemischen Messungen mit und ohne Außenpotential bei der Lochkorrosion von Aluminium in chloridhaltigen MedienDie Lochkorrosion von Aluminium in Natriumchloridlösungen wurden durch Messung des freien Korrosionspotentials und der Polarisation in 3%igen Natriumchloridlösungen unter sucht. Dabei wurde die zeitliche Abhängigkeit des Potentials für verschiedene Aluminiumlegierungen bestimmt; überwiegend wurden die handelsübliche reine Legierung 1 S (Al 99, 5) und höchstreines Aluminium verwendet. Außerdem wurden Polarisationsmessungen mit der Legierung 1 S unter potentiostatischen und galvanostatischen Bedingungen in entlüfteten Lösungen durchgeführt. Die Ergebnisse zeigen, daß die Auslösung, das Wachstum und die Repassivierung der Löcher einen reproduzierbaren Verlauf in Abhängigkeit von Potential und Zeit aufweisen. Die Löcher entstehen nur oberhalb eines kritischen Potentials und repassivieren sich unterhalb eines aktiveren Schutzpotentials, was die klassischen Theorien stützt. Das Lochwachstum erfolgt entweder Makroskopisch an einer Gesamtfront oder interkristallin; Welcher der beiden Mechanismen auftritt, hängt davon ab, ob das Potential oberhalb oder unterhalb des Lochfraßpotential liegt. Die gemessenen freien Potentialwerte und die Polarisationsdaten stimmen für alle Phasen der Aluminiumkorrosion vollständig überein.
    Notes: Pitting of aluminium in NaCl solutions has been investigated by open-circuit and polarization studies in 3% NaCl solutions. The variation of the corrosion potential has been measured with respect to time for various Al alloys; however, the emphasis has been on the commercially-poure 1 S (Al 99,5) and the super-pure metal. In addition, polarization data have been obtained for the 1S alloy under potentiostatic and galvanostatic conditions in deaerated solutions. The results indicate that pit initiation, propagation, and repassivation show certain reproducible trends as a function of potential and time. Pits initiate only above a critical pitting potential and repassivate below a more active protection potential in support of the classical theories. Pit propagation occurs on a macroscopic front or exhibits intercrystalline nature depending on whether the potential is, respectively, above or below the pitting potential. Open-circuit and polarization data are in full correspondence regarding all phase of aluminium corrosion.
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 114-123 
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    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: Beständigkeit von α-Bronzen gegen HochtemperaturkorrosionDie Oxidation von CuSn-Legierungen mit bis 13 Gew.-% Zinn in Sauerstoff (1 atm) wurde im Temperaturbereich 550 bis 800 °C im Abstand von jeweils 50 °C untersucht; dabei wurden die kinetischen Gesetzmäßigkeiten sowie die Morphologie und das Gefüge des Zunders mit physikalischen Methoden ermittelt, um die beiden Aspekte des Oxidationsverhaltens zu korrelieren. Die Oxidationsgeschwindigkeit einer Legierung mit 3% Zinn liegt bei 550 und 600 °C unter der von Kupfer, oberhalb 600 °C jedoch darüber. Der Einfluß des Zinnzusatzes erstreckt sich auf die Wechselbeziehung zwischen verschiedenen die Reaktionsgeschwindigkeit beeinflussenden Faktoren, wobei aber das Gesamtergebnis von der Temperatur abhängig ist. Bei höheren Zinngehalten ist die Oxidationsgeschwindigkeit immer geringer als die von reinem Kupfer; als Ursache hierfür wird die Bildung einer Zinndioxidschicht als unterste Zone im Zunder angenommen. Diese Schicht ist zwar dünn und gewöhnlich auch diskontinuierlich, doch verlangsamt sie die Diffusion des Kupfers nach außen. Auch die höchste unter Berücksichtigung den Hochtemperaturlöslichkeit in Kupfer erreichbare Zinnkonzentration reicht noch nicht aus, um eine kontinuierliche, dicke und ausheilungsfähige Zinndioxidschicht auf der Legierungsoberfläche zu erzeugen; trotzdem wird dadurch eine deutliche Abnahme der Oxidationsgeschwindigkeit erreicht.
    Notes: The oxidation of Cu-Sn alloys containing up to 13 wt% Sn in oxygen (1 atm) has been studied in the temperature range 550 °C to 800 °C at 50 °C intervals; the investigation involved the study of the kinetics and of the morphology and structure of the scales by appropriate physical methods, with the aim of correlating the two aspects of the oxidation behaviour. The oxidation rate of a 3 wt% Sn alloy is lower than for pure Cu at 550 and 600 °C, but higher above 600°C. The effect of the tin addition is related to the interplay of many different factors affecting the reaction rate, the overall result depending on temperature. The rate of oxidation of the more concentrated alloys, however, is always lower than that of pure Cu. This result is attributed to the formation of an SnO2 layer at the base of the scale which, although thin and usually discontinous, slows down the outward diffusion of copper. The highest tin concentration allowed by its high temperature solubility in copper is not sufficient to produce a continous thick healing layer of SnO2 at the alloy surface, but nevertheless it produces a pronounced decrease of the oxidation rate.
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 128-133 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 133-133 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Description / Table of Contents: Comparability of the dependence of corrosion and corrosion inhibition on chloride ion and inhibition on chloride ion and inhibitor concentration on the example of pure iron and steel 1405 (also phosphated)The rates of uptake of O2 under standard conditions were measured for iron powder shaken with and without added inhibitor in dependence on the amount of iron and the chloride ion concentration. The results show that the standard procedure used allows a trustworthy measure of the inhibitor efficiency to be drawn from the observed effect. The relationship between the results for DAB 6 iron powder with 1405 steel plates was confirmed by experiments performed on filings from the plates.The rate of corrosion of phosphatized 1405 steel plate is efficiently suppressed by inhibitors with phosphonic acid groups.A treatment of the unphosphatized steel plates with phosphonic acid containing inhibitors in an analogous manner to phosphatizing leads to unsatisfactory results.The conclusion was drawn that the pH value of the inhibitor at the surface layer is important for the attainment of optimal effect.
    Notes: Die Abhängigkeit der „unter Standardbedingungen“ im Schüttelversuch ohne und mit Inhibitoren ermittelten O2-Aufnahmegeschwindigkeit von der Chloridionenkonzentration und der Menge an Eisenpulver wird ermittelt. Ergebnis: die von uns bisher eingehaltenen Standardbedingungen vermitteln an Hand der Schutz werte ein qualitativ verläßliches Bild über die Inhibitorwirksamkeit.Die Vergleichbarkeit der im Schüttelversuch mit DAB 6-Eisenpulver ermittelten Werte mit den im Schüttelversuch mit 1405-Stahlblechen gefundenen Werten wird durch Versuche mit 1405-Stahlblechraspel abgesichert.Die Korrosionsrate phosphatisierter Stahlbleche 1405 wird durch Inhibitoren mit Phosphonsäuregruppen wirksam unterdrückt.Eine der Phosphatierung analoge Vorbehandlung der Stahlproen mit phosphonsäuregruppenhaltigen Inhibitoren führt zu unbefriedigenden Resultaten. Auf die Bedeutung des pH-Wertes für eine optimale Wirkung von Inhibitoren als Deckschichtbildner wird hinge wiesen.
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 133-144 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 148-155 
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 155-163 
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 145-146 
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 146-148 
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 163-164 
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 168-168 
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979) 
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 179-185 
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    Description / Table of Contents: Die Korrosion von Eisen in reinem SO2 unter verschiedenen Drücken bei 700°CDie Reaktion zwischen Eisen und reinem SO2 wurde unter verschiedenen Drücken bei 700 °C untersucht. Die Versuche unter statischen Bedingungen zeigten eine große Streuung der kinetischen Daten; umgekehrt lieferten die Versuche unter Normaldruck in strömendem SO2 weitgehend reproduzierbare Ergebnisse. Diese Ergebnisse unterschieden sich jedoch in einigen Punkten von denen früherer Untersuchungen. Mögliche Deutungen werden diskutiert. Schließlich wurde die Bildung von Eisensulfid außerhalb der Bedingungen thermodynamischer Stabilität untersucht, wobei die Möglichkeit einer direkten Reaktion des Metalls mit SO2 statt mit dessen Dissoziationsprodukten betrachtet wird.
    Notes: The reaction between iron and pure SO2 under different pressures at 700 °C has been studied. The experiments carried out under static conditions showed a large scatter of kinetic data while the runs in flowing SO2 at atmospheric pressure produced fairly reproducible results under convenient conditions. They differ, however, in some aspects from previous results for the same system; possible reasons for this effect are discussed. Finally, the formation of iron sulfide beyond the conditions of thermodynamic stability is examined by considering the possibility of the direct reaction of the metal with SO2 rather than with the dissociation products of the latter.
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 185-189 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Description / Table of Contents: Spannungskorrosionsprüfung und AuswertungUntersucht wurden Werkstoffe mit dem Ziel, den Einfluß von Vorspannungen auf die Bruchfestigkeit zu ermitteln. Dabei wurden die Wirkung von Natriumchlorid auf Aluminium und nichtrostendem Stahl und die von Ammoniumhydroxid auf Messing und Kupfer geprüft. Die Bruchfestigkeit nimmt danach mit zunehmender Vorspannung ab. Für die Auswirkung wurde ein „Spannungskorrosionsindex“ definiert, der vom zu Beginn vorliegenden Vorspannungszustand abhängt; zwischen diesem Index und der prozentualen Vorspannung besteht eine lineare Beziehung.
    Notes: Experiments have been carried out on structural materials to investigate the effect of pre-straining on the rupture strength. The effect of sodium chloride on aluminium and stainless steel and that of ammonium hydroxide on brass and copper has been analysed. It hat been found that the rupture strength decreases with increasing pre-strain. A stress corrosion index has been defined and this index has been found to depend on the initial pre-strain; a linear relation exists with the percentage of pre-strain.
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 169-179 
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Hot dip galvanizing of silicon containing steels - the problem and some attempts to its solutionHot dip galvanizing of silicon containing steels, which are increasingly used today, involves the danger of very thick, poorly adherent, unsightly zinc coatings forming on the steel surface. Quite a number of attempts have been made to prevent this drawback. Chemical surface treatments of the steels to be galvanized did not yield the desired success, whilst mechanical surface treatments by shot blasting gave positive results in certain cases only. Galvanizing in the upper temperature range of conventional working practice (475-485 °C) appears appropriate for steels containing 0.15-0.20% Si, whereas low-temperature galvanizing at 430-440 °C using conventional galvanizing baths should be universally applicable provided that suitable methods are found for pre-heating parts of larger dimensions.Galvanizing with inhibited attack of the zinc caused by small additions of aluminium (less than 0.2%) did not yield coating thicknesses independent of the Si content of the steel. High-temperature galvanizing at more than 530 °C gives satisfactory coatings irrespective of the Si content of the steel; saturation of the galvanizing bath with iron should, however, be avoided.Low-temperature galvanizing at less than 430 °C is possible on principle, provided that the melting point of the zinc is reduced by adding alloying elements such as tin (10-30%), magnesium (3%), or aluminium (4-5%). However, tin is expensive, magnesium deteriorates the wetting properties of the steel, and aluminium requires a very careful pre-treatment, the coatings obtained exhibiting low thicknesses and dependency on the Si content of the steel with iron-saturated baths.Galvanizing with reduced zinc concentrations in zinc-saturated lead baths gave zinc coatings independent of the Si content, while currentless galvanizing in zinc-saturated salt baths was not successful.
    Notes: Beim Feuerverzinken der zunehmend Verwendung findenden siliziumhaltigen Stähle besteht die Gefahr der Bildung sehr dicker, schlecht haftender und unansehnlicher Verzinkungsschichten. Eine Vielzahl von Gegenmaßnahmen wurde erprobt. Chemische Oberflächenvorbehandlungen der zu verzinkenden Stähle waren nicht erfolgreich, mechanische Oberflächenvorbehandlungen durch Strahlen nur zum Teil. Eine Verzinkung im oberen Temperatur-Grenzbereich der konventionellen Stückverzinkung stellt als 475°/485° Verzinkung nur für Stähle mit 0,15-0,20% Si eine Hilfsmaßnahme dar, universell anwendbar sollte dagegen das Tieftemperatur- Verzinken bei 430-440 °C in konventionellen Verzinkungsbädern sein, sofern geeignete Verfahren zum Vorwärmen von Verzinkungsgut größerer Abmessungen gefunden werden. Verzinken mit inhibiertem Zinkangriff, herbeigeführt durch geringe Aluminium-Zusätze (weniger als 0,2%) zum Zink ergab keine vom Si-Gehalt des Stahles unabhängigen Schichtdicken. Hochtemperatur- Verzinken bei mehr als 530 °C ergibt eine vom Siliziumgehalt des Stahles unabhängige Verzinkung, eine Sättigung des Zinkbades an Eisen muß aber vermieden werden. Ein Tiefsttemperatur- Verzinken bei weniger als 430 °C ist im Prinzip möglich, wenn der Schmelzpunkt des Zinks durch größere Zusätze von Legierungselementen, wie z. B. Zinn (10-30%), Magnesium (3%) oder Aluminium (4-5%) abgesenkt wird. Zinn ist aber teuer, Magnesium führt zu schlechter Benetzung des Stahls, Aluminium erfordert eine äußerst sorgfältige Vorbehandlung bei zugleich geringen und in eisengesättigten Bädern vom Si-Gehalt des Stahles abhängigen Schichtdicken. Verzinken mit verminderter Zink-Konzentration in zinkgesättigten Bleibädern ergab eine vom Siliziumgehalt unabhängige Zinkauflage, stromlose Verzinkungsversuche in zinkgesättigten Salzbädern waren nicht erfolgreich.
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 189-197 
    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: Einfluß der Wärmebehandlung auf die Lochkorrosion von austenitischen CrNiMo-Stählen in Natriumchlorid-LösungDie Lochkorrosionsbeständigkeit von Cr 17 Ni 12 Mo 2,5-Stahl in Natriumchloridlösung bei potentiostatischer Polarisation wird durch vorherige Wärmebehandlung ungünstig beeinflußt. Obwohl die Reproduzierbarkeit und Genauigkeit der Messungen wegen des statistischen Charakters der Lochkorrosion begrenzt sind, ergab sich eine systematische Abhängigkeit der Lochkorrosion von Wärmebehandlungstemperatur und -dauer sowie der Oberflächenrauhigkeit. Korrosionsstrom, Lochzahl (bzw. mittlere Fläche der Lochöffnungen) sowie die Korrosionsgeschwindigkeit im Inneren der Löcher werden durch vorheriges Erhitzen auf 550-750 °C (1-100 Std.) erhöht. Die höchsten berechneten Korrosionsgeschwindigkeiten ergaben sich bei Wärmebehandlungen, die für interkristalline Korrosion sensibilisierten. Der Flächenanteil der Lochöffnungen sowie die Lochwachstumsgeschwindigket waren bei mechanisch bearbeiteten Oberflächen um ein mehrfaches höher als bei polierten. Es ist anzunehmen, daß die Lochkorrosion durch den C-Gehalt nur wenig beeinflußt wird und daß Molybdänverarmung der Korngrenzenbereiche der für die verringerte Lochkorrosionsbeständigkeit ursächliche Faktor ist.
    Notes: The pitting corrosion resistance of Cr 17 Ni 12 Mo 2,5 type steel under potentiostatic polarization in a sodium chloride solution is adversely affected by previous annealing. Even though the reproducibility and accuracy of measurements are limited due to the statistical nature of pitting, the data obtained were systematically dependent on annealing temperature, time and surface roughness. The corrosion current, the number of pits or the mean area of pit opening and the corrosion rate within the pits were increased by previous annealing at 550 to 750 °C for 1-100 hrs. The highest corrosion rate estimated corresponded to heat treatments provoking severe sensitization to intergranular corrosion. The percentage area of corrosion pit openings and the estimated pit penetration rates were several times higher for as-machined than for polished surfaces. It can be assumed that pitting corrosion is little affected by the carbon content and that molybdenum depletion of grain-boundary zones is responsible for the reduced pitting resistance of annealed steels.
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 211-219 
    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
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 197-205 
    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: Technico-economical evaluation of corrosion losses of steel structures in Northern BohemiaThe corrosion rates of structural steel, zinc and aluminium are estimated for the region of Northern-Bohemia on the basis of several years' weathering in 15 atmospheric weathering-stations; in addition the useful life of three-layer paint systems was evaluated in factories and electricity distribution systems in the vicinity of such weathering stations. In this context the cost are compared for replacement of corroded steel parts (thickness reduction by 50%) and by the use of corrosion protection systems (hot-galvanizing, aluminium sprayed cating and three-layer paint system including repainting at defined intervals). Hot-dip galvanizing appears to be the optimum solution with respect to cost as well as the amount of work required.
    Notes: Aufgrund von mehrjährigen Bewitterungsversuchen in 15 Bewitterungsstationen in Nord-Böhmen (ČSSR) wurden die Korrosionsgeschwindigkeit von Baustahl, Zink und Aluminium ermittelt; außerdem wurde in Produktionsbetrieben sowie an Elektrizitätsverteilungssystemen in der Nähe der Bewitterungsstationen die Lebensdauer von dreischichtigen Anstrichsystemen ermittelt. Dabei wird eine Gegenüberstellung der Kosten vorgenommen, die sich durch Ersatz von korrodierten Stahlteilen (Abnahme auf 50% der ursprünglichen Dicke) sowie bei der Verwendung von Korrosionsschutzsystemen (Feuerverzinkung, Aluminiumspritzüberzug und dreischichtiges Anstrichsystem einschließlich der Anstricherneuerung in bestimmten Zeitabständen) ergeben. Sowohl im Hinblick auf die Kosten als auch auf den Arbeitsaufwand ist eine Feuerverzinkung die optimale Lösung.
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 220-222 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 206-210 
    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: Korrosion von Kupfer in Schwefelsaure bei WärmeübergangsbedingungenBei spontaner Konvektion von der oberen horizontalen Fläche von scheibenförmigen Kupferelektroden wurde die Korrosionsgeschwindigkeit von Kupfer in einer Lösung von 1 N Schwefelsäure + 0,001 M Kaliumdichromat gemessen. Dabei wurden die Einflüsse der Oberflächentemperatur des korrodierenden Metalls und der Einfluß der Temperaturdifferenz zwischen der Metalloberfläche und der Lösung ermittelt. Der beschleunigende Einfluß des Wärmeübergangs wird der zusätzlichen Strömung zugeschrieben, die durch den Temperaturgradienten erzeugt wird. Die Ergebnisse können durch die Gleichung Sh = 0.163 (Sc - GRh)0.33 wiedergegeben werden, worin Sh = Sherwood-Zahl, welche die Korrosionsgeschwindigkeit unter Wärmeübergang ausdrückt, GRh = kombinierte Grasshof-Zahl für den Einfluß von Konzentration und Temperatur, und Sc = Schmidt-Zahl.
    Notes: Under the conditions of the spontaneous convection from the upper horizontal surface of disk-type copper electrodes the copper corrosion rate in a solution of 1 N H2SO4 +0.001 M K2Cr2O7 was measured. The effects of the surface temperature of the corroding metal and the effect of the temperature difference between the surface and the solution were determined. The accelerating effect of the heat transfer is attributed to the additional free flow induced by the temperature gradient. Results can be correlated by the equation Sh = 0.163 (Sc · GRh)0.33, where Sh is the Sherwood number expressing the corrosion rate at the heat transfer, GRh is the combined Grashof number for the pressure effect of concentration and temperature, and Sc is the Schmidt number.
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 223-223 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 223-224 
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 224-226 
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 226-226 
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    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 226-227 
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