共查询到20条相似文献,搜索用时 102 毫秒
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梅钢二号高炉中修停炉更换五、六段冷却壁时采用了降料线打水回收煤气的方法.通过控制炉顶温度、煤气中H2和O2含量、炉内通氮气等措施做到了安全停炉,全程无爆震.计算了停炉料和停炉过程中料线的位置,保证了整个停炉过程按计划进行,使得料线顺利降到风口以下,为后续的恢复性改造施工创造了有利条件. 相似文献
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Examined health-related issues concerning women in the military (i.e., pregnancy-related conditions, physical injuries and capabilities, stress-related disorders). It is noted that the most frequent reason for being hospitalized among Navy women who enlisted from 1974–1979 was for a pregnancy-related condition. Comparisons of injury-related hospitalizations indicated that these women had the highest hospitalization rates across occupational groups and pay grades. Women assigned to nontraditional jobs had somewhat higher admission rates for injuries than women in traditional jobs. Rates for injury- and stress-related conditions tended to decrease with increasing pay grade levels. Programs designed to improve women's physical conditioning, enhance job-related capabilities, and expand their opportunities are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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《Acta Metallurgica》1985,33(5):873-879
The analysis of lamellar twin nucleation and growth in materials with f.c.c structure is given. The orientation of the annealing twin components in copper and Fe-50% Ni alloy was determined by Laue back reflection method. Twin component misorientation can be different from Σ = 3. Besides Σ = 3, misorientations with Σ = 11, 9, 5, 17 and 13 were observed. Results are discussed in terms of atomic mechanism of twin formation due to grain boundary dissociation. A more correct definition of twin is given. 相似文献
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D Birnkrant 《Canadian Metallurgical Quarterly》1983,143(8):1633-1634
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《Acta Metallurgica》1987,35(3):631-641
Macroplastic deformation results from the long-distance movement of dislocations. In singlephase crystals it implies cutting the dislocation forest traversing the slip plane of the running dislocations and, as a consequence of the non-regular distribution of the “trees”, dislocation loops are left around the harder islands in their slip planes. The dislocation length so stored represents an increment of the obstacle density already present in other non-coplanar slip systems and thus contributes to their work-hardening. This work presents quantitative results on the contribution by forest cutting in a f.c.c. metal upon flow stress and work hardening rate. It has been obtained by computer simulation of dislocation glide through a mixture of punctual and linear obstacles whose strengths reproduce approximately the strength spectrum of a f.c.c. forest as derived by Shoeck and Frydman. Simulations have been conducted for random arrays of obstacles and for more realistic spatial dislocation distributions (cells, subgrains). Both the flow stress (and its temperature and strain rate dependence) and the athermal work-hardening rate so obtained are in good agreement with those measured for f.c.c. polycrystals in experiments covering up to large strains. 相似文献
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Picture-recognition performance of H.M. and 6 controls was evaluated 6 mo after initial learning, using materials from an earlier study in which the S received additional study time in order to equate his yes–no and delayed-match-to-sample (DMS) performance 10 min after learning to that of control Ss. In the present study, 6-mo recognition performance was assessed with no intervening exposure to target items. The S performed at chance levels when tested using the standard yes–no recognition procedure. When the yes–no procedure was modified so that distractor stimuli required positive responses, performance was comparable with that of controls. In addition, the S's DMS and delayed-nonmatch-to-sample performance were comparable with that of controls 6 mo after learning. Conclusions regarding the S's 6-mo recognition performance are thus dependent on the procedures used to assess memory. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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This reviews articles in a special issue (Civiello, 2009) of the Consulting Psychology Journal: Practice and Research on applications of psychology in the U.S. intelligence and military contexts. It identifies some common themes of the articles, as well as provides individual critiques of them. In general, the reviewer notes that the articles focus more on the current and desired state conditions than on the strategies, process, and mechanisms that might have been employed to obtain those desired states. This suggests that embedded psychologists might adopt a socio-technical-structural systems perspective and attempt to expand their specialized roles to include consulting on organizational change. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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《Acta Metallurgica Materialia》1992,40(2):205-219
The microstructural evolution during polyslip in f.c.c. metals in investigated by the examples of Al, Ni, NiCo alloys and an AlMg alloy, deformed at room temperature either by rolling or by torsion. The principles governing this evolution appears to be the following: (a) There are differences in the number and selection of simultaneously acting slip systems among neighboring volume elements of individual grains. In any one volume element (called a cell block), the number of slip systems falls short of that required for homogeneous (Taylor) deformation, but groups of neighboring cell blocks fulfil the Taylor criterion collectively. (b) The dislocations are trapped into low-energy dislocation structures in which neigboring dislocations mutually screen their stresses. The microstructural evolution at small strains progresses by the subdivision of grains into cell blocks delineated by dislocation boundaries. These boundaries accomodate the lattice misorientations, which result from glide on different slip system combinations in neighbouring cell blocks. The cell blocks are subdivided into ordinary cells and both cell blocks and cells shrink with increasing strain. All observations appear to be in good accord with the theoretical interpretation. However, some problems remain to be solved quantitatively. 相似文献