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101.
A model for the formation of grain boundaries in single crystals having a single active slip system for the case of plane strain simple shear is proposed. It is shown that non-convexity of the condensed energy gives rise to the formation of a laminate structure, where sharp interfaces between laminate layers are interpreted as grain boundaries. Based on these results the dislocation structure of the boundaries is determined introducing a transition zone between laminate layers, where smooth functions of displacement and plastic slip connect adjacent layers. (© 2015 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
102.
Ohne Zusammenfassung 相似文献
103.
J. H. Brewer D. R. Harshman E. Koster S. R. Kreitzman D. R. Noakes M. Senba D. Li. Williams E. J. Ansaldo 《Hyperfine Interactions》1986,31(1-4):433-437
Giant μ+ Knight shifts Kμ have been studied previously in Sb andSbBi alloys. Here we report μ+SR measurements on Sb with dilute heterovalent Sn impurities. A dramatic concentration dependence is observed: Kμ is increased slightly (relative to the value in pure Sb) by Sn concentrations of <0.1%, whereas larger concentrations cause
a drastic reduction of Kμ. One concern could be that Kμ values in the alloy might reflect local band structure in trap sites near Sn impurities rather than the bulk “host” band
structure of the alloy. This is indeed the case in bothSbSn (0.03%) andSbSn (0.06%), where a second, lower frequency TF-μSR signal begins to appear for T>60K. The amplitude of the low Kμ signal grows with increasing T at the expense of the amplitude of the high-Kμ, low-T signal, suggesting that the μ+ migrates through the host lattice to trap sites. A simple trapping model correctly describes the observed T-dependence of
the amplitudes, phases and relaxation rates of the two signals. We conclude that the low-T Knight shift is truly characteristic
of the host band structure while the much lower Kμ value of the high-T site is characteristic of a specific trap site, presumably adjacent to a Sn impurity. 相似文献
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Stephen A. Wise Michele M. Schantz Barbara J. Koster Rabia Demiralp Elizabeth A. Mackey Robert R. Greenberg Mechthild Burow Peter Ostapczuk Ted I. Lillestolen 《Fresenius' Journal of Analytical Chemistry》1993,345(2-4):270-277
Summary Fresh frozen homogenates of pilot whale blubber and liver tissue were prepared for use as control materials for the determination of organic and inorganic contaminants in marine mammal tissue analyses. The blubber material was analyzed to determine 30 polychlorinated biphenyl congeners and 16 chlorinated pesticides using gas chromatography with electron capture detection and gas chromatographymass spectrometry. A total of 39 trace elements and methylmercury were determined in the liver homogenate using instrumental neutron activation analysis, voltammetry, and cold vapor atomic absorption spectroscopy. The preparation and analysis of these two tissue materials are part of the development of marine mammal tissue reference materials. 相似文献
106.
107.
S. Guggenheim A. F. Koster van Groos 《Journal of Thermal Analysis and Calorimetry》1992,38(7):1701-1728
High-pressure differential thermal analysis results are used to describe dehydration reactions for the clay-like materials of Na-rich montmorillonite, K-, Ca-, and Mg-exchanged montmorillonite, kerolite, and a high-pressure phase resembling talc/mica with excess water. Because sealed capsules may be used to contain fluids, it is possible to evaluate the role of H2O in these reactions. A separate paper (Part II) addresses the use of HP-DTA to understand dehydroxylation reactions in these materials. 相似文献
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109.
Amir Hossein Gharehgozli Yugang Yu René de Koster Jan Tijmen Udding 《European Journal of Operational Research》2014
This paper studies an operational problem arising at a container terminal, consisting of scheduling a yard crane to carry out a set of container storage and retrieval requests in a single container block. The objective is to minimize the total travel time of the crane to carry out all requests. The block has multiple input and output (I/O) points located at both the seaside and the landside. The crane must move retrieval containers from the block to the I/O points, and must move storage containers from the I/O points to the block. The problem is modeled as a continuous time integer programming model and the complexity is proven. We use intrinsic properties of the problem to propose a two-phase solution method to optimally solve the problem. In the first phase, we develop a merging algorithm which tries to patch subtours of an optimal solution of an assignment problem relaxation of the problem and obtain a complete crane tour without adding extra travel time to the optimal objective value of the relaxed problem. The algorithm requires common I/O points to patch subtours. This is efficient and often results in obtaining an optimal solution of the problem. If an optimal solution has not been obtained, the solution of the first phase is embedded in the second phase where a branch-and-bound algorithm is used to find an optimal solution. The numerical results show that the proposed method can quickly obtain an optimal solution of the problem. Compared to the random and Nearest Neighbor heuristics, the total travel time is on average reduced by more than 30% and 14%, respectively. We also validate the solution method at a terminal. 相似文献
110.