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当前世界各国都在陆续开展针对铅锌矿床中锌同位素的研究,因为加强铅锌矿床中锌同位素的探究对于环境地球化学研发具有重要意义。铅锌矿床常见类型包括矽卡岩型、密西西比河谷型(MVT型)、喷流沉积型(SEDEX型)、火山热液块状硫化物型(VMS型)、砂页岩型、热液脉型、斑岩型。本文通过分析铅锌矿床中锌同位素的主要来源而对当前主要的两种锌同位素载体矿床矽卡岩型铅锌矿床和密西西比河谷型铅锌矿床中的锌同位素组成特征进行了探究,希望能为相关学者在此方面的研究提供必要的参考数据。 相似文献
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根据东秦岭﹙河南段﹚钼矿床3种成矿流体﹙燕山期岩浆作用形成的高温成矿热液、熊耳期火山期后热液、构造动力作用形成的中低温成矿流体﹚,对应划分3种钼矿床成因类型:岩浆热液交代型钼矿床、石英脉型钼矿床和构造蚀变岩型钼矿床。区内岩浆热液交代型钼矿床,是广义上的斑岩型钼矿,包括斑岩型钼矿、斑岩-矽卡岩型钼矿、斑岩-爆破角砾岩型钼矿、爆破角砾岩型、矽卡岩型钼矿钼矿。根据其产出空间位置不同,进一步划分内接触带型、接触带型和外接触带型矿床。文章还介绍了各类型典型钼矿床特征,分析了各类型钼矿床的找矿方向。 相似文献
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武月锋 《Canadian Metallurgical Quarterly》2011,30(4)
建国以来,大学生政治参与从信念型服从型向利益分配型、从暴力准暴力革命型向和平合法建设型、从动员型无序型向自主型有序型、从形式参与向实际参与转变.大学生政治参与范式的转变是党执政合法性和治理有效性基础增强、我国民主政治建设不断推进的标志.大学生政治参与呈现出"扩大"和"有序"的发展态势. 相似文献
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试论我国富锰矿类型,特征及控矿因素 总被引:1,自引:0,他引:1
富锰矿成因类型可以分为海底热水沉积型、火山喷发—沉积型、沉积受变质型、热液改造型和风化型。分别阐述和分析以上成因类型特别是风化型成因类型的形成机理。指出了富锰矿远景区和找矿的方向. 相似文献
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Studies have been done on the phase equilibria at subsolidus temperatures in the Ti TiNi HfNi Hf region of the Ti Ni Hf ternary system. The phases based on binary compounds and solid solutions of these components are accompanied in the equilibria by a phase based on an equiatomic ternary compound. This new phase belongs to the family of Laves phases and has a hexagonal crystal structure of MgZn2 type. The solidus surface in the Ti TiNi HfNi Hf subsystem consists of the surface of the ternary phase alone, the surfaces of the six solid solutions based on the components and binary intermediate phases, the planes of five conode triangles, and the corresponding lineated surfaces. 相似文献
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Comments on the article "Sin, the lesser of two evils" by O.H. Mower (1960). In a recent issue of the American Psychologist, Hobart Mowrer (see record 1961-03555-001) argues that because "sin" is a stronger word than "wrongdoing" or "irresponsibility" it is better for the "neurotic" individual to admit his "sins" than accept his "wrongdoings." In upholding the concept of individual (if not original) "sin," Mowrer is contending that the "neurotic" individual must, if he is to get "well," accept the following syllogism: (a) sinning is unjustified; (b) I have sinned; (c) therefore, I must justify my existence by acknowledging my sins, changing my ways, and becoming a nonsinner. At first blush, this seems like a perfectly valid syllogism. But, as Mowrer himself suggests, it rarely works in practice. The author contends that with a more objective and realistic restatement of Mowrer's syllogism, the problem of the "neurotic" individual's changing his ineffective and self-defeating behavior is hardly automatically solved; but (by having the definitional concepts of deep worthlessness and severe ego "insult" removed from his philosophic premises) he becomes much more likely resolutely to tackle what Mowrer accurately describes as his moralpsychological difficulties. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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2 groups of 34 and 36 Ss were asked to recall a list of 27 words—10 associates to the word cheese, 10 unrelated words matched for frequency, 6 buffer words, and the stimulus word "Cheese," embedded in the center of the list. The pattern of recall was studied (a) before "Cheese" was recalled, (b) after "Cheese" was recalled, and (c) when "Cheese" was forgotten. As predicted, a significantly greater number of associates than control words were recalled before "Cheese" was recalled; after "Cheese" was recalled and when "Cheese" was forgotten, an equal number of associates and control words were recalled. Findings were substantially the same in the 2 groups of Ss. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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ML Crossley 《Canadian Metallurgical Quarterly》1997,45(12):1863-1873
Recent research on contemporary processes of self-construction has suggested that the concepts of "self", "health", "morality" and "responsibility" have become inextricably interconnected, to the extent that the "pursuit of health has become the pursuit of moral personhood" [R. Crawford (1994) The boundaries of the self and the unhealthy other: reflections on health, culture and AIDS, Social Science & Medicine 38(10), 1347-1365]. What happens then when a person becomes "diseased"? Are they doomed to the stagnant mire of "illness" and "immorality", to the role of undesirable "other"? What if the disease is HIV infection? Is it the case of HIV = AIDS = DEATH = "OTHER" par excellence? This paper addresses these issues by examining the constructions of "self" and "other" used by HIV positive individuals themselves. By reference to a specific group of people living with long-term HIV positive diagnoses, it demonstrates how unhealthy HIV infected "others", as perceived by "healthy" members of society, create their own conceptions of "self" and "other" which microcosmically mirror typical processes of identity construction. The content, function and potential advantages and disadvantages of these processes are highlighted. 相似文献
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柳学军 《有色冶金设计与研究》2007,28(4):40-42
"形式"属于哲学范畴的概念,与"内容"相对.建筑的"形"是点、线、面的统一,建筑设计创作中琦"式"是规律、法则、手法.本文对这两个方面作了一些探讨,以期对建筑创作中的形式有所认识和把握. 相似文献
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To avoid cracks during hot rolling, a short process of direct cold rolling following solution treatment of the casting billet for preparing lean duplex stainless steel plates is proposed. The effect of cold rolling reduction on the microstructure, texture, and mechanical properties of UNS S32101 is investigated. The results show that dislocation slip is the main character in ferrite, which leads to dislocation tangles, dislocation cells, high-density dislocation walls, and deformed microbands. However, twinning and strain-induced martensite transformation (SIMT) occur in austenite, and the SIMT mechanism of austenite follows the classical model γ → ε → α′ and γ → α′, with the orientation relationship of Kurdjumov–Sachs ( and ) and Nishyama–Wassermann (N–W) ( and ). Meanwhile, at 50%, there is a transition from Cu texture to Brass texture in the austenite phase. At 12.5%, the yield strength is 344 MPa higher than that of the traditional hot rolling process, and the elongation remains about 35%. With the increasing cold rolling reduction, the elongation decreases while the strength rises significantly. Strengthening dislocations, fine-tuning grains, and SIMT are the primary contributors to the improvement in strength. 相似文献
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36 "independents" and 36 "yielders" were selected from the extremes of a distribution of 143 Ss scored on an inventory measure of conformity. While looking at a Necker reversible cube Ss were instructed to keep the perspective in the "up" phase. At random intervals Ss recorded the actual phase perceived. The "independents" had fewer reversals of perspective than the "yielders" (p 相似文献
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The enthalpies of mixing H and excess volumes V were analyzed in alloy formation from binary metallic eutectic systems. Three types of systems can be distinguished: I with H > 0, V > 0; II with H > 0, V 0; III with H < 0, V 0. The hypothesis is discussed that another yet unstudied group IV exists in which H < 0, V < 0. 相似文献
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This note discusses the effect of assigning weights independently to such related item categories as "marital status" and "number of children," where "single status" forces a "no children" response. It is suggested that, in the contingent item-category, the "can't respond" group be separated out before percents and weights are computed on the rest of the sample. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献