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281.
Cold cracking in DC-cast high strength aluminum alloy ingots: An intrinsic problem intensified by casting process parameters 总被引:1,自引:0,他引:1
M. Lalpoor D.G. Eskin D. RuvalcabaH.G. Fjær A. Ten CateN. Ontijt L. Katgerman 《Materials Science and Engineering: A》2011,528(6):2831-2842
For almost half a century the catastrophic failure of direct chill (DC) cast high strength aluminum alloys has been challenging the production of sound ingots. To overcome this problem, a criterion is required that can assist the researchers in predicting the critical conditions which facilitate the catastrophic failure of the ingots. This could be achieved at first glance by application of computer simulations to assess the level and distribution of residual thermal stresses. However, the simulation results are only able to show the critical locations and conditions where and when high stresses may appear in the ingots. The prediction of critical void/crack size requires simultaneous application of fracture mechanics. In this paper, we present the thermo-mechanical simulation results that indicate the critical crack size distribution in several DC-cast billets cast at various casting conditions. The simulation results were validated upon experimental DC-casting trials and revealed that the existence of voids/cracks with a considerable size is required for cold cracking to occur. 相似文献
282.
E. van der Kolk O.M. Ten KateJ.W. Wiegman D. BinerK.W. Krämer 《Optical Materials》2011,33(7):1024-1027
A high resolution luminescence study of NaLaF4: 1%Pr3+, 5%Yb3+ and NaLaF4: 1%Ce3+, 5%Yb3+ in the UV to NIR spectral range using a InGaAs detector and a fourier transform interferometer is reported. Although the Pr3+(3P0 → 1G4), Yb3+(2F7/2 → 2F5/2) energy transfer step takes place, significant Pr3+1G4 emission around 993, 1330 and 1850 nm is observed. No experimental proof for the second energy transfer step in the down-conversion process between Pr3+ and Yb3+ can be given. In the case of NaLaF4: Ce3+, Yb3+ it is concluded that the observed Yb3+ emission upon Ce3+ 5d excitation is the result of a charge transfer process instead of down-conversion. 相似文献
283.
Defining the Interaction of Human Soluble Lectin ZG16p and Mycobacterial Phosphatidylinositol Mannosides 下载免费PDF全文
Dr. Shinya Hanashima Dr. Sebastian Götze Dr. Yan Liu Akemi Ikeda Prof. Kyoko Kojima‐Aikawa Prof. Naoyuki Taniguchi Dr. Daniel Varón Silva Prof. Ten Feizi Prof. Peter H. Seeberger Dr. Yoshiki Yamaguchi 《Chembiochem : a European journal of chemical biology》2015,16(10):1502-1511
ZG16p is a soluble mammalian lectin that interacts with mannose and heparan sulfate. Here we describe detailed analysis of the interaction of human ZG16p with mycobacterial phosphatidylinositol mannosides (PIMs) by glycan microarray and NMR. Pathogen‐related glycan microarray analysis identified phosphatidylinositol mono‐ and di‐mannosides (PIM1 and PIM2) as novel ligand candidates of ZG16p. Saturation transfer difference (STD) NMR and transferred NOE experiments with chemically synthesized PIM glycans indicate that PIMs preferentially interact with ZG16p by using the mannose residues. The binding site of PIM was identified by chemical‐shift perturbation experiments with uniformly 15N‐labeled ZG16p. NMR results with docking simulations suggest a binding mode of ZG16p and PIM glycan; this will help to elucidate the physiological role of ZG16p. 相似文献
284.