丝状体蓝藻殖段分化的影响因子及其调节机制

本文阐述了丝状体蓝藻等灌殖段分化的影响因子——环境因子、离子等对分化的影响，对分化的调节机制也作了一定的阐述，指出光受体、谷氨酸等合成酶的合成和活性调节的Pn蛋白具有重要的作用。     

武器自动机虚拟试验技术研究

在对自动武器进行靶场试验时,自动机运动参数及射击频率的测试是很重要的一个内容。以动力学仿真软件ADAMS为仿真测试平台,以导气式自动武器为研究对象,针对这一类武器的工作特点,对自动机虚拟试验技术进行了研究,解决了从工作载荷生成到武器单发、连发动作仿真控制等一系列关键问题,从而为武器自动机虚拟试验技术提出了一套系统的解决方案。最后通过对某一型号武器自动机的运动参数测试,证明了该方案的可行性。     

对考虑摩擦时机构力分析逐次逼近迭代方法的改进

当机构中不含有二力杆时,考虑摩擦的力分析一般采用逐次逼近迭代方法求解。本文针对目前通用的迭代方法所存在的不足,对迭代方法进行了改进,给出了新的速代方法,并编制了计算机程序。通过算例证明,本方法比未改进方法的收敛速度加快20—40％。     

政府信用危机及其预防机制

政府信用危机是由于政府违背社会契约，行为不正义而导致，其发生通常是局部性的，而其危害往往是全局性的；政府信用危机通常没有标准化的测量方法，而且造成后果通常难以恢复，因此主要以预防为主；政府信用危机是一个价值概念，本文目的不在于证明某些事件是否构成信用危机，而是试图寻找一种预防机制。     

石墨烯增强铝基SiC复合材料的动态失效机理与抗侵彻性能

研究石墨烯增强铝基复合材料的动态力学性能、失效机理以及抗侵彻性能.通过静、动态压缩测试掌握了材料在0.001~5 200.000 s-1应变率范围内的力学性能,揭示了该材料的应变率效应,结合光学显微镜（OM）和扫描电镜（SEM）分析了该材料在静、动态压缩下的断裂机理;通过弹道枪试验掌握了该材料与Q235钢面板层叠构成复合结构及12~18 mm厚Q235A钢板的弹道极限速度及极限比吸收能.试验结果表明,Q235A钢/石墨烯增强铝基复合结构的极限比吸收能是12~14 mm厚度范围Q235A钢板的1.79倍,34.10 mm厚石墨烯增强铝基SiC复合材料的极限比吸收能与16.70 mm厚Q235A钢相当.      

Effect of Zr addition on the stability of precipitated Laves phase and mechanical properties of Fe–Cr–Al-based alloys at high temperatures

The effect of a small amount of Zr addition on the temperature-dependent stability of Laves phase particles and mechanical properties of Fe-13.5Cr-4.73Al-2.07Mo-(0.34–0.5)Nb-(0.65–0.98)Ta-(0–0.33)Zr (wt. %) ferritic alloys was investigated in the present study. The designed alloy ingots were hot-rolled, aged at 1073 ?K for 24 ?h, and then re-treated at 1273 ?K, 1323 ?K, 1373 ?K, and 1473 ?K for 1 ?h, respectively. It was found that the Zr addition could not only stabilize the Fe₂M Laves phase (M ?= ?Mo,Nb,Ta,Zr) to a much higher temperature, but also induce the formation of stable Fe₂₃Zr₆ phase. The high-temperature (HT) microstructural stability of the alloys significantly was improved, as evidenced by the fact that a certain amount (0.66–1.19%) of precipitates (Fe₂M, Fe₂₃Zr₆, and core(Fe₂₃Zr₆)-shell(Fe₂M)-structured particles) with an appropriate size (～1.0 ?μm) uniformly distributed in the ferritic matrix even after being re-treated at 1473 ?K. Particularly, the formation of core-shell-structured particles at HTs was studied from the viewpoint of both solid solubility and diffusion coefficient of M in the matrix. All these aged alloys exhibited prominent mechanical properties at both room and elevated temperatures, showing high yield strength with σ_YS ?= ?490–560 ?MPa at room-temperature and σ_YS ?= ?80–85 ?MPa at 1073 ?K. The strengthening effect was further discussed in light of various strengthening mechanisms, and the calculated strength are in good agreement with the experimental results.     

锌基合金异常共沉积的机理研究现状

综述了锌基合金异常共沉积的机理研究进展情况,通过对膜吸附机理、电化学机理、欠电势沉积机理、离子软硬度的影响、量子化学解释和界面作用机理等各种不同观点的介绍和分析,总结了各自的优势和不足,为锌基合金异常共沉积的机理进一步研究提供了帮助.     

社会主义市场经济"市场规则"的道德要求何以可能?

每个市场经济行为主体都必须遵守基本的道德要求。我们有什么权利对他们提出道德要求?培育市场经济条件下经济道德建设所需的道德环境，加强经济法制建设，建立道德赏罚机制和健全社会道德监督机制，加紧完善市场经济，才是道德重建的正道。     

外翻式注射机合模机构优化设计

建立了以功效系数为目标函数的数学模型，对注射容量为２０００ｃｍ＾３，合模力为６００ｔ的外翻式注射机合模机构进行了优化计算。     

Tropes As Mechanisms

This paper is an attempt to further our understanding of mechanisms conceived of as ontologically separable from laws. What opportunities are there for a mechanistic perspective to be independent of, or even more fundamental than, a law perspective? Advocates of the mechanistic view often play with the possibility of internal and external reliability, or with the paralleling possibilities of enforcing, counteracting, redirecting, etc., the mechanisms’ power to produce To further this discussion I adopt a trope ontology. It is independent of the notion of law, and can easily be adapted to account for such characteristics of mechanisms. The idea of tropes as mechanisms is worked out in some detail. According to the resulting picture, there is still an opportunity to link mechanisms and laws. But while the predominant law view conceives of mechanistic approaches as special kinds of law accounts, this study indicates that the converse may be true. Law accounts are special cases of mechanistic accounts, and they work only in those worlds where the mechanisms are of the right kind