ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • Artikel  (39)
  • Male  (17)
  • Chemical Engineering  (14)
  • Engineering General
  • 2010-2014  (14)
  • 1985-1989  (25)
Sammlung
  • Artikel  (39)
Erscheinungszeitraum
Jahr
  • 1
    Publikationsdatum: 2013-06-01
    Beschreibung: A genome-wide association study (GWAS) of educational attainment was conducted in a discovery sample of 101,069 individuals and a replication sample of 25,490. Three independent single-nucleotide polymorphisms (SNPs) are genome-wide significant (rs9320913, rs11584700, rs4851266), and all three replicate. Estimated effects sizes are small (coefficient of determination R(2) approximately 0.02%), approximately 1 month of schooling per allele. A linear polygenic score from all measured SNPs accounts for approximately 2% of the variance in both educational attainment and cognitive function. Genes in the region of the loci have previously been associated with health, cognitive, and central nervous system phenotypes, and bioinformatics analyses suggest the involvement of the anterior caudate nucleus. These findings provide promising candidate SNPs for follow-up work, and our effect size estimates can anchor power analyses in social-science genetics.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3751588/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3751588/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rietveld, Cornelius A -- Medland, Sarah E -- Derringer, Jaime -- Yang, Jian -- Esko, Tonu -- Martin, Nicolas W -- Westra, Harm-Jan -- Shakhbazov, Konstantin -- Abdellaoui, Abdel -- Agrawal, Arpana -- Albrecht, Eva -- Alizadeh, Behrooz Z -- Amin, Najaf -- Barnard, John -- Baumeister, Sebastian E -- Benke, Kelly S -- Bielak, Lawrence F -- Boatman, Jeffrey A -- Boyle, Patricia A -- Davies, Gail -- de Leeuw, Christiaan -- Eklund, Niina -- Evans, Daniel S -- Ferhmann, Rudolf -- Fischer, Krista -- Gieger, Christian -- Gjessing, Hakon K -- Hagg, Sara -- Harris, Jennifer R -- Hayward, Caroline -- Holzapfel, Christina -- Ibrahim-Verbaas, Carla A -- Ingelsson, Erik -- Jacobsson, Bo -- Joshi, Peter K -- Jugessur, Astanand -- Kaakinen, Marika -- Kanoni, Stavroula -- Karjalainen, Juha -- Kolcic, Ivana -- Kristiansson, Kati -- Kutalik, Zoltan -- Lahti, Jari -- Lee, Sang H -- Lin, Peng -- Lind, Penelope A -- Liu, Yongmei -- Lohman, Kurt -- Loitfelder, Marisa -- McMahon, George -- Vidal, Pedro Marques -- Meirelles, Osorio -- Milani, Lili -- Myhre, Ronny -- Nuotio, Marja-Liisa -- Oldmeadow, Christopher J -- Petrovic, Katja E -- Peyrot, Wouter J -- Polasek, Ozren -- Quaye, Lydia -- Reinmaa, Eva -- Rice, John P -- Rizzi, Thais S -- Schmidt, Helena -- Schmidt, Reinhold -- Smith, Albert V -- Smith, Jennifer A -- Tanaka, Toshiko -- Terracciano, Antonio -- van der Loos, Matthijs J H M -- Vitart, Veronique -- Volzke, Henry -- Wellmann, Jurgen -- Yu, Lei -- Zhao, Wei -- Allik, Juri -- Attia, John R -- Bandinelli, Stefania -- Bastardot, Francois -- Beauchamp, Jonathan -- Bennett, David A -- Berger, Klaus -- Bierut, Laura J -- Boomsma, Dorret I -- Bultmann, Ute -- Campbell, Harry -- Chabris, Christopher F -- Cherkas, Lynn -- Chung, Mina K -- Cucca, Francesco -- de Andrade, Mariza -- De Jager, Philip L -- De Neve, Jan-Emmanuel -- Deary, Ian J -- Dedoussis, George V -- Deloukas, Panos -- Dimitriou, Maria -- Eiriksdottir, Guethny -- Elderson, Martin F -- Eriksson, Johan G -- Evans, David M -- Faul, Jessica D -- Ferrucci, Luigi -- Garcia, Melissa E -- Gronberg, Henrik -- Guethnason, Vilmundur -- Hall, Per -- Harris, Juliette M -- Harris, Tamara B -- Hastie, Nicholas D -- Heath, Andrew C -- Hernandez, Dena G -- Hoffmann, Wolfgang -- Hofman, Adriaan -- Holle, Rolf -- Holliday, Elizabeth G -- Hottenga, Jouke-Jan -- Iacono, William G -- Illig, Thomas -- Jarvelin, Marjo-Riitta -- Kahonen, Mika -- Kaprio, Jaakko -- Kirkpatrick, Robert M -- Kowgier, Matthew -- Latvala, Antti -- Launer, Lenore J -- Lawlor, Debbie A -- Lehtimaki, Terho -- Li, Jingmei -- Lichtenstein, Paul -- Lichtner, Peter -- Liewald, David C -- Madden, Pamela A -- Magnusson, Patrik K E -- Makinen, Tomi E -- Masala, Marco -- McGue, Matt -- Metspalu, Andres -- Mielck, Andreas -- Miller, Michael B -- Montgomery, Grant W -- Mukherjee, Sutapa -- Nyholt, Dale R -- Oostra, Ben A -- Palmer, Lyle J -- Palotie, Aarno -- Penninx, Brenda W J H -- Perola, Markus -- Peyser, Patricia A -- Preisig, Martin -- Raikkonen, Katri -- Raitakari, Olli T -- Realo, Anu -- Ring, Susan M -- Ripatti, Samuli -- Rivadeneira, Fernando -- Rudan, Igor -- Rustichini, Aldo -- Salomaa, Veikko -- Sarin, Antti-Pekka -- Schlessinger, David -- Scott, Rodney J -- Snieder, Harold -- St Pourcain, Beate -- Starr, John M -- Sul, Jae Hoon -- Surakka, Ida -- Svento, Rauli -- Teumer, Alexander -- LifeLines Cohort Study -- Tiemeier, Henning -- van Rooij, Frank J A -- Van Wagoner, David R -- Vartiainen, Erkki -- Viikari, Jorma -- Vollenweider, Peter -- Vonk, Judith M -- Waeber, Gerard -- Weir, David R -- Wichmann, H-Erich -- Widen, Elisabeth -- Willemsen, Gonneke -- Wilson, James F -- Wright, Alan F -- Conley, Dalton -- Davey-Smith, George -- Franke, Lude -- Groenen, Patrick J F -- Hofman, Albert -- Johannesson, Magnus -- Kardia, Sharon L R -- Krueger, Robert F -- Laibson, David -- Martin, Nicholas G -- Meyer, Michelle N -- Posthuma, Danielle -- Thurik, A Roy -- Timpson, Nicholas J -- Uitterlinden, Andre G -- van Duijn, Cornelia M -- Visscher, Peter M -- Benjamin, Daniel J -- Cesarini, David -- Koellinger, Philipp D -- AA09367/AA/NIAAA NIH HHS/ -- AA11886/AA/NIAAA NIH HHS/ -- BB/F019394/1/Biotechnology and Biological Sciences Research Council/United Kingdom -- CZB/4/710/Chief Scientist Office/United Kingdom -- DA024417/DA/NIDA NIH HHS/ -- DA029377/DA/NIDA NIH HHS/ -- DA05147/DA/NIDA NIH HHS/ -- DA13240/DA/NIDA NIH HHS/ -- ETM/55/Chief Scientist Office/United Kingdom -- F31 DA029377/DA/NIDA NIH HHS/ -- G0600705/Medical Research Council/United Kingdom -- G0700704/Medical Research Council/United Kingdom -- G9815508/Medical Research Council/United Kingdom -- K05 AA017688/AA/NIAAA NIH HHS/ -- MC_PC_U127561128/Medical Research Council/United Kingdom -- MC_UU_12013/1/Medical Research Council/United Kingdom -- MC_UU_12013/3/Medical Research Council/United Kingdom -- MC_UU_12013/5/Medical Research Council/United Kingdom -- MH016880/MH/NIMH NIH HHS/ -- MH066140/MH/NIMH NIH HHS/ -- MR/K026992/1/Medical Research Council/United Kingdom -- P01 AG005842/AG/NIA NIH HHS/ -- P01 CA089392/CA/NCI NIH HHS/ -- P01 GM099568/GM/NIGMS NIH HHS/ -- P01-AG005842/AG/NIA NIH HHS/ -- P01-AG005842-20S2/AG/NIA NIH HHS/ -- P30 AG012810/AG/NIA NIH HHS/ -- P30-AG012810/AG/NIA NIH HHS/ -- R01 AA009367/AA/NIAAA NIH HHS/ -- R01 AA011886/AA/NIAAA NIH HHS/ -- R01 DA013240/DA/NIDA NIH HHS/ -- R01 HL090620/HL/NHLBI NIH HHS/ -- R01 HL105756/HL/NHLBI NIH HHS/ -- R01 HL111314/HL/NHLBI NIH HHS/ -- R01 MH066140/MH/NIMH NIH HHS/ -- R37 DA005147/DA/NIDA NIH HHS/ -- T32 AG000186/AG/NIA NIH HHS/ -- T32 MH016880/MH/NIMH NIH HHS/ -- T32-AG000186-23/AG/NIA NIH HHS/ -- U01 AG009740/AG/NIA NIH HHS/ -- U01 DA024417/DA/NIDA NIH HHS/ -- Z01 AG001050-01/Intramural NIH HHS/ -- ZIA AG000196-03/Intramural NIH HHS/ -- ZIA AG000196-04/Intramural NIH HHS/ -- New York, N.Y. -- Science. 2013 Jun 21;340(6139):1467-71. doi: 10.1126/science.1235488. Epub 2013 May 30.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Applied Economics, Erasmus School of Economics, Erasmus University Rotterdam, Rotterdam, Netherlands.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23722424" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Cognition ; *Educational Status ; Endophenotypes ; Female ; Genetic Loci ; *Genome-Wide Association Study ; Humans ; Male ; Multifactorial Inheritance ; *Polymorphism, Single Nucleotide
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 2
    Publikationsdatum: 2012-09-18
    Beschreibung: There is evidence across several species for genetic control of phenotypic variation of complex traits, such that the variance among phenotypes is genotype dependent. Understanding genetic control of variability is important in evolutionary biology, agricultural selection programmes and human medicine, yet for complex traits, no individual genetic variants associated with variance, as opposed to the mean, have been identified. Here we perform a meta-analysis of genome-wide association studies of phenotypic variation using approximately 170,000 samples on height and body mass index (BMI) in human populations. We report evidence that the single nucleotide polymorphism (SNP) rs7202116 at the FTO gene locus, which is known to be associated with obesity (as measured by mean BMI for each rs7202116 genotype), is also associated with phenotypic variability. We show that the results are not due to scale effects or other artefacts, and find no other experiment-wise significant evidence for effects on variability, either at loci other than FTO for BMI or at any locus for height. The difference in variance for BMI among individuals with opposite homozygous genotypes at the FTO locus is approximately 7%, corresponding to a difference of approximately 0.5 kilograms in the standard deviation of weight. Our results indicate that genetic variants can be discovered that are associated with variability, and that between-person variability in obesity can partly be explained by the genotype at the FTO locus. The results are consistent with reported FTO by environment interactions for BMI, possibly mediated by DNA methylation. Our BMI results for other SNPs and our height results for all SNPs suggest that most genetic variants, including those that influence mean height or mean BMI, are not associated with phenotypic variance, or that their effects on variability are too small to detect even with samples sizes greater than 100,000.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3564953/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3564953/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yang, Jian -- Loos, Ruth J F -- Powell, Joseph E -- Medland, Sarah E -- Speliotes, Elizabeth K -- Chasman, Daniel I -- Rose, Lynda M -- Thorleifsson, Gudmar -- Steinthorsdottir, Valgerdur -- Magi, Reedik -- Waite, Lindsay -- Smith, Albert Vernon -- Yerges-Armstrong, Laura M -- Monda, Keri L -- Hadley, David -- Mahajan, Anubha -- Li, Guo -- Kapur, Karen -- Vitart, Veronique -- Huffman, Jennifer E -- Wang, Sophie R -- Palmer, Cameron -- Esko, Tonu -- Fischer, Krista -- Zhao, Jing Hua -- Demirkan, Ayse -- Isaacs, Aaron -- Feitosa, Mary F -- Luan, Jian'an -- Heard-Costa, Nancy L -- White, Charles -- Jackson, Anne U -- Preuss, Michael -- Ziegler, Andreas -- Eriksson, Joel -- Kutalik, Zoltan -- Frau, Francesca -- Nolte, Ilja M -- Van Vliet-Ostaptchouk, Jana V -- Hottenga, Jouke-Jan -- Jacobs, Kevin B -- Verweij, Niek -- Goel, Anuj -- Medina-Gomez, Carolina -- Estrada, Karol -- Bragg-Gresham, Jennifer Lynn -- Sanna, Serena -- Sidore, Carlo -- Tyrer, Jonathan -- Teumer, Alexander -- Prokopenko, Inga -- Mangino, Massimo -- Lindgren, Cecilia M -- Assimes, Themistocles L -- Shuldiner, Alan R -- Hui, Jennie -- Beilby, John P -- McArdle, Wendy L -- Hall, Per -- Haritunians, Talin -- Zgaga, Lina -- Kolcic, Ivana -- Polasek, Ozren -- Zemunik, Tatijana -- Oostra, Ben A -- Junttila, M Juhani -- Gronberg, Henrik -- Schreiber, Stefan -- Peters, Annette -- Hicks, Andrew A -- Stephens, Jonathan -- Foad, Nicola S -- Laitinen, Jaana -- Pouta, Anneli -- Kaakinen, Marika -- Willemsen, Gonneke -- Vink, Jacqueline M -- Wild, Sarah H -- Navis, Gerjan -- Asselbergs, Folkert W -- Homuth, Georg -- John, Ulrich -- Iribarren, Carlos -- Harris, Tamara -- Launer, Lenore -- Gudnason, Vilmundur -- O'Connell, Jeffrey R -- Boerwinkle, Eric -- Cadby, Gemma -- Palmer, Lyle J -- James, Alan L -- Musk, Arthur W -- Ingelsson, Erik -- Psaty, Bruce M -- Beckmann, Jacques S -- Waeber, Gerard -- Vollenweider, Peter -- Hayward, Caroline -- Wright, Alan F -- Rudan, Igor -- Groop, Leif C -- Metspalu, Andres -- Khaw, Kay Tee -- van Duijn, Cornelia M -- Borecki, Ingrid B -- Province, Michael A -- Wareham, Nicholas J -- Tardif, Jean-Claude -- Huikuri, Heikki V -- Cupples, L Adrienne -- Atwood, Larry D -- Fox, Caroline S -- Boehnke, Michael -- Collins, Francis S -- Mohlke, Karen L -- Erdmann, Jeanette -- Schunkert, Heribert -- Hengstenberg, Christian -- Stark, Klaus -- Lorentzon, Mattias -- Ohlsson, Claes -- Cusi, Daniele -- Staessen, Jan A -- Van der Klauw, Melanie M -- Pramstaller, Peter P -- Kathiresan, Sekar -- Jolley, Jennifer D -- Ripatti, Samuli -- Jarvelin, Marjo-Riitta -- de Geus, Eco J C -- Boomsma, Dorret I -- Penninx, Brenda -- Wilson, James F -- Campbell, Harry -- Chanock, Stephen J -- van der Harst, Pim -- Hamsten, Anders -- Watkins, Hugh -- Hofman, Albert -- Witteman, Jacqueline C -- Zillikens, M Carola -- Uitterlinden, Andre G -- Rivadeneira, Fernando -- Kiemeney, Lambertus A -- Vermeulen, Sita H -- Abecasis, Goncalo R -- Schlessinger, David -- Schipf, Sabine -- Stumvoll, Michael -- Tonjes, Anke -- Spector, Tim D -- North, Kari E -- Lettre, Guillaume -- McCarthy, Mark I -- Berndt, Sonja I -- Heath, Andrew C -- Madden, Pamela A F -- Nyholt, Dale R -- Montgomery, Grant W -- Martin, Nicholas G -- McKnight, Barbara -- Strachan, David P -- Hill, William G -- Snieder, Harold -- Ridker, Paul M -- Thorsteinsdottir, Unnur -- Stefansson, Kari -- Frayling, Timothy M -- Hirschhorn, Joel N -- Goddard, Michael E -- Visscher, Peter M -- 090532/Wellcome Trust/United Kingdom -- 14136/Cancer Research UK/United Kingdom -- AA014041/AA/NIAAA NIH HHS/ -- AA07535/AA/NIAAA NIH HHS/ -- AA10248/AA/NIAAA NIH HHS/ -- AA13320/AA/NIAAA NIH HHS/ -- AA13321/AA/NIAAA NIH HHS/ -- AA13326/AA/NIAAA NIH HHS/ -- CZB/4/710/Chief Scientist Office/United Kingdom -- DA12854/DA/NIDA NIH HHS/ -- F32 AR059469/AR/NIAMS NIH HHS/ -- F32 DK079466/DK/NIDDK NIH HHS/ -- G0601261/Medical Research Council/United Kingdom -- G1000143/Medical Research Council/United Kingdom -- GM057091/GM/NIGMS NIH HHS/ -- HHSN268201100005C/HL/NHLBI NIH HHS/ -- HHSN268201100006C/HL/NHLBI NIH HHS/ -- HHSN268201100007C/HL/NHLBI NIH HHS/ -- HHSN268201100008C/HL/NHLBI NIH HHS/ -- HHSN268201100009C/HL/NHLBI NIH HHS/ -- HHSN268201100010C/HL/NHLBI NIH HHS/ -- HHSN268201100011C/HL/NHLBI NIH HHS/ -- HHSN268201100012C/HL/NHLBI NIH HHS/ -- K05 AA017688/AA/NIAAA NIH HHS/ -- K23 DK080145/DK/NIDDK NIH HHS/ -- MC_PC_U127561128/Medical Research Council/United Kingdom -- MC_U106179471/Medical Research Council/United Kingdom -- MC_U127561128/Medical Research Council/United Kingdom -- N01 AG012100/AG/NIA NIH HHS/ -- N01 HC015103/HC/NHLBI NIH HHS/ -- N01 HC025195/HC/NHLBI NIH HHS/ -- N01 HC035129/HC/NHLBI NIH HHS/ -- N01 HC045133/HC/NHLBI NIH HHS/ -- N01 HC055222/HC/NHLBI NIH HHS/ -- N01 HC075150/HC/NHLBI NIH HHS/ -- N01 HC085079/HC/NHLBI NIH HHS/ -- N01 HG065403/HG/NHGRI NIH HHS/ -- N01HC85086/HL/NHLBI NIH HHS/ -- N02 HL64278/HL/NHLBI NIH HHS/ -- P30 DK063491/DK/NIDDK NIH HHS/ -- P30 DK072488/DK/NIDDK NIH HHS/ -- R01 AA007535/AA/NIAAA NIH HHS/ -- R01 AA013320/AA/NIAAA NIH HHS/ -- R01 AA013321/AA/NIAAA NIH HHS/ -- R01 AA013326/AA/NIAAA NIH HHS/ -- R01 AA014041/AA/NIAAA NIH HHS/ -- R01 AG015928/AG/NIA NIH HHS/ -- R01 AG020098/AG/NIA NIH HHS/ -- R01 AG023629/AG/NIA NIH HHS/ -- R01 AG027058/AG/NIA NIH HHS/ -- R01 DA012854/DA/NIDA NIH HHS/ -- R01 DK062370/DK/NIDDK NIH HHS/ -- R01 DK072193/DK/NIDDK NIH HHS/ -- R01 DK073490/DK/NIDDK NIH HHS/ -- R01 DK075681/DK/NIDDK NIH HHS/ -- R01 DK075787/DK/NIDDK NIH HHS/ -- R01 HG002651/HG/NHGRI NIH HHS/ -- R01 HL043851/HL/NHLBI NIH HHS/ -- R01 HL059367/HL/NHLBI NIH HHS/ -- R01 HL075366/HL/NHLBI NIH HHS/ -- R01 HL080295/HL/NHLBI NIH HHS/ -- R01 HL086694/HL/NHLBI NIH HHS/ -- R01 HL087641/HL/NHLBI NIH HHS/ -- R01 HL087647/HL/NHLBI NIH HHS/ -- R01 HL087652/HL/NHLBI NIH HHS/ -- R01 HL087676/HL/NHLBI NIH HHS/ -- R01 HL087679/HL/NHLBI NIH HHS/ -- R01 HL105756/HL/NHLBI NIH HHS/ -- R01 LM010098/LM/NLM NIH HHS/ -- R01 MH063706/MH/NIMH NIH HHS/ -- RL1 MH083268/MH/NIMH NIH HHS/ -- U01 DK062418/DK/NIDDK NIH HHS/ -- U01 HG004402/HG/NHGRI NIH HHS/ -- U01 HL054527/HL/NHLBI NIH HHS/ -- U01 HL069757/HL/NHLBI NIH HHS/ -- U01 HL072515/HL/NHLBI NIH HHS/ -- U01 HL084729/HL/NHLBI NIH HHS/ -- U01 HL084756/HL/NHLBI NIH HHS/ -- U54 RR020278/RR/NCRR NIH HHS/ -- UL1 RR033176/RR/NCRR NIH HHS/ -- Z01 HG000024-14/Intramural NIH HHS/ -- England -- Nature. 2012 Oct 11;490(7419):267-72. doi: 10.1038/nature11401. Epub 2012 Sep 16.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉University of Queensland Diamantina Institute, The University of Queensland, Princess Alexandra Hospital, Brisbane, Queensland 4102, Australia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22982992" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Body Height/genetics ; *Body Mass Index ; Co-Repressor Proteins ; Female ; *Genetic Variation ; Genome-Wide Association Study ; Humans ; Male ; Nerve Tissue Proteins/genetics ; *Phenotype ; Polymorphism, Single Nucleotide ; Proteins/*genetics ; Repressor Proteins/genetics
    Print ISSN: 0028-0836
    Digitale ISSN: 1476-4687
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    Digitale Medien
    Digitale Medien
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 29 (1989), S. 749-761 
    ISSN: 0032-3888
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Multi-cavity transfer molding is an important process step in several electronic and photonic technologies. In some applications, uniform filling of the cavities of the mold, or mold balancing, is required. A semi-empirical flow model to predict mold filling patterns was developed. The algorithm is a one-dimensional network flow simulation that uses experimental pressure drop data to determine the volumetric flow rate through the gates and runners. A comprehensive experimental program was undertaken to determine these hydraulic resistances for different flow rates and mold geometries. A theoretical treatment is also described to compute hydraulic resistance from gate geometry. Uniform gate resistances provide unbalanced filling and higher velocities in the cavities. Balanced filling can significantly reduce the molding compound velocity and the flow induced stresses, but imperfect balancing compromises the benefits. Experimental filling patterns were obtained for two sets of gates. The agreement between the model and the experiments was satisfactory, and the discrepancies were attributed to correctable phenomena.
    Zusätzliches Material: 12 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 4
    Digitale Medien
    Digitale Medien
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 29 (1989), S. 1796-1796 
    ISSN: 0032-3888
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 5
    Digitale Medien
    Digitale Medien
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 26 (1986), S. 1399-1404 
    ISSN: 0032-3888
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: A new capillary rheometer incorporated in an instrumented transfer molding press has been developed. This rheometer is effective for determining the viscosity characteristics of thermoset molding compounds under both isothermal and typical molding conditions. In examples of the rheometer's utility, the power law indices of two commercial epoxy molding compounds have been determined to be approximately 0.7. Additionally it has been shown that preconditioning typical epoxy compounds at 47 percent relative humidity causes a viscosity decrease of about 40 percent owing to plasticization of the epoxy resin.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 6
    Digitale Medien
    Digitale Medien
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 27 (1987), S. 86-100 
    ISSN: 0032-3888
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The time-dependent behavior of linearly viscoelastic materials is known to be very sensitive to changes in temperature and in solvent (water) concentration. Following an investigation by the authors of this sensitivity in terms of the associated small volume changes, a nonlinearly viscoelastic model of constitutive behavior was formulated earlier in terms of the free volume concept and evaluated in terms of experiments on poly(vinyl acetate). Following a brief presentation of the earlier results these concepts are expanded and refined in the present paper to deal with transient deformation histories under pressure. In this connection, model computations explore the effect of simultaneous pressurization and straining. In addition the effect of “ageing” the polymer under pressures of various magnitudes and for different lengths of time are investigated. It becomes clear that the yield phenomenon depends sensitively on pressure and on the ageing time. In addition, the volume change under transient thermal histories in the glass transition range is explored, largely in terms of Kovacs' experimental data and attendant computations. These considerations are presented from a unified point of view of nonlinear thermoviscoelastic constitutive behavior, principally with phenomenological material description in mind. These computations provide guidance to the design of experiments for the proper determination of the relevant material functions and seem to indicate a need for the reevaluation of certain experimental procedures in the time histories of thermal material characterization.
    Zusätzliches Material: 12 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 7
    Digitale Medien
    Digitale Medien
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 5 (1985), S. 1047-1057 
    ISSN: 0271-2091
    Schlagwort(e): Transonic Flow ; Modified Potential ; Finite Elements ; Non-isentropic Flow ; Conservative Method ; Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Notizen: The classical potential formulation of inviscid transonic flows is modified to account for non-isentropic effects. The density is determined in terms of the speed as well as the pressure, which in turn is calculated from a second-order mixed-type equation derived via differentiating the momentum equations.The present model differs in general from the exact inviscid Euler equations since the flow is assumed irrotational. On the other hand, since the shocks are not isentropic, they are weaker and are placed further upstream compared to the classical potential solution. Furthermore, the streamline leaving the aerofoil does not necessarily bisect the trailing edge.Results for the present conservative calculations are presented for non-lifting and lifting aerofoils at subsonic and transonic speeds and compared to potential and Euler solutions.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 8
    Digitale Medien
    Digitale Medien
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 7 (1987), S. 17-27 
    ISSN: 0271-2091
    Schlagwort(e): Finite Element ; Navier-Stokes Stream ; Function Vorticity ; Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Notizen: The incompressible, two-dimensional Navier-Stokes equations are solved by the finite element method (FEM) using a novel stream function/vorticity formulation. The no-slip solid walls boundary condition is applied by taking advantage of the simple implementation of natural boundary conditions in the FEM, eliminating the need for an iterative evaluation of wall vorticity formulae. In addition, with the proper choice of elements, a stable scheme is constructed allowing convergence to be achieved for all Reynolds numbers, from creeping to inviscid flow, without the traditional need for upwinding and its associated false diffusion. Solutions are presented for a variety of geometries.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 9
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Communications in Applied Numerical Methods 3 (1987), S. 327-333 
    ISSN: 0748-8025
    Schlagwort(e): Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Mathematik , Technik allgemein
    Notizen: In Reference 1, a summary of results of numerical solutions to steady-state laminar flows in an expanding planar channel from 15 research groups was presented. Both vorticity and pressure values computed along a wall of the channel were compared. This paper presents some possible explanations for the wide discrepancies in these computed results.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 10
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Communications in Applied Numerical Methods 5 (1989), S. 159-169 
    ISSN: 0748-8025
    Schlagwort(e): Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Mathematik , Technik allgemein
    Notizen: Boundary approximation solutions using a singular Green function basis have been widely applied to the solution of a variety of linear problems. To avoid the difficulties associated with integration over singularities it is convenient to use sets of non-singular, complete Trefftz functions, and this procedure has been applied recently with success using an indirect formulation. In the paper we observe that direct formulation is here again possible and that for some problems it performs in a superior way.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...