全面风险管理导向下中小制造企业内部控制

对内部控制理论的发展历史进行了介绍,对国内外学者关于中小制造企业内部控制的研究成果进行了梳理,并结合我国中小制造企业内部控制和风险管理现状进行了相关分析,构建了基于全面风险管理的中小制造企业内部控制框架,以期完善企业内部控制理论体系并对我国中小制造企业实践提供参考。     

长宁河流域水污染防治对策

通过对宜宾市长宁河流域污染源进行全面的调查，并结合水环境质量现状分析，在核定水环境容量基础上，有针对性的提出水污染治理措施及项目规划，并分析环境目标的可达性，以此来探索长江上游小流域水污染防治的特点，实现流域社会、经济、环境的可持续协调发展。     

华北地台晚古生代煤中微量元素及As的分布

研究了华北聚煤盆地晚古生代煤中微量元素，并与全国和西南地区煤中微量元素含量进行了对比。还研究了煤的区域地球化学特征，在华北地台划分了3个煤区域地球化学带，绘制了山西组和太原组煤中As等元素的分布图。结果发现，除个别微量有害元素（如Ni,U,Cl,Mo,Cu,Zn)在局部地区富集外，华北聚煤盆地晚古生代煤中微量有害元素含量较低。整体上不足以对环境和人体造成危害（燃煤产物及其危害性尚值得深入研究）；As的区域分布和古地理环境及煤岩煤质特征相吻合，指出华北地台晚古生煤中微量元素的分布总体上主要受控于聚煤古环境，其分布具有南北分带，东西延展的特征。     

最小势能原理在小挠度薄板中的应用

利用最小势能原理对小挠度薄板进行弹性分析，并给出薄板的近似计算的方法，同时，还具体地计算了受均布载荷作用的板的挠度．     

基于PB的FPSS系统的设计及其开发

如何在多品种小批量的生产环境下快速经济地得出生产作业调度方案是目前研究的热点。文章围绕一个机械加工公司展开,利用启发式算法来解决生产排序调度问题,并讨论了调度规则库的构建。FPSS系统运行表明:能快速得出生产作业排序调度方案,能根据内外环境的变化快速做出有效的资源调整。     

Low-temperature X-ray microanalysis of the differentiating vascular tissue in root tips of Lemna minor L

The fracture faces of bulk-frozen tissue offer a number of advantages for the analysis of diffusible elements. They are easy to prepare, remain uncontaminated, and, unlike most frozen-hydrated sections, can be shown to exist in a fully hydrated state throughout examination and analysis. Root tips of Lemna minor briefly treated with a polymeric cryoprotectant are quench frozen in melting nitrogen. Fractures are prepared using the AMRAY Biochamber, lightly etched if necessary to reveal surface detail and carbon coated while maintaining the specimen at 110 K. The frozen-hydrated fracture faces are analysed at 110 K using the P/B ratio method which is less sensitive to changes in surface geometry and variations in beam current. The method has been used to investigate the distribution of seven elements (Na+, Mg⁺⁺, P, S, Cl^?, K+ and Ca⁺⁺) in the developing vascular tissue of the root tip. The microprobe can measure relative elemental ratios at the cellular level and the results from this present study reveal important variations in different parts of the root. The younger, more actively dividing cells, appear to have a slightly higher concentration of diffusible ions in comparison to the somewhat older tissues which have begun to differentiate into what are presumed to be functional vascular elements.     

Separation of Americium from Europium using Camphor-BisTriazinyl Pyridine: A Fundamental Study

Among the different components present in spent nuclear fuel, long-lived trivalent actinides are particularly difficult to separate from the shorter-lived lanthanide fission products due to their similar chemical properties. Selective extraction of americium from acidic solution (up to 2M HNO₃) containing tenth molar quantities of lanthanides has been achieved using neutral pyridine-based ligands dissolved in polar diluents. Nitrogen-based Bis Triazinyl Pyridine (BTP) ligands are desirable for both their excellent An/Ln selectivity and incinerability. Results pertaining to ligand solubility, kinetics, hydrolytic stability, and extraction performance in various nitric acid environments are presented.     

Study on FBR core concepts to increase proliferation resistance of plutonium in LWR–FBR transition period

The possibility to enhance proliferation resistance of discharged plutonium in fast breeder reactor (FBR) has been investigated in terms of reactor core-design aspects. The provisional target for proliferation resistance measures based on Saito's attractiveness (ATTR) is defined. It is found that a few percent of plutonium loading and/or Am/Cm loading, which come from various types of spent fuel, might satisfy the provisional target with a minimum impact on the core neutronic performances. On Am/Cm loading core, decay heat constraints for fuel-handling aspects are found to be important and should be considered in design. There is not significant change on the current developing scenarios for light water reactor–FBR transition period by applying the measures based on Saito's ATTR. It is found that applying Kimura's proposal, 15% ²³⁸Pu content requires about 7% MA loading fraction both in the core and the blanket, and it only can be applied at limited case. The period to consume minor actinides is shorter than to consume plutonium.     

中国城市内涝防治与大小排水系统分析

近年来,由于我国城市内涝灾害频发,如何科学、有效地解决城市内涝成为政府与专业人员关注的热点.简要分析、总结了城市内涝的成因及洪涝关系、我国城市内涝防治思路的局限性以及部分发达国家针对洪涝的分类与治理情况.然后针对大小排水系统的概念、组成、应用情况及其局限性进行了系统梳理,并提出积极推进风险评估,为大小排水系统科学的规划设计提供科学依据.最后选择某城区和大型住宅区两个不同尺度的典型案例,简要介绍其大小排水系统构成与规划设计和内涝综合防治的要点和效果.     

Evaluation of Proliferation Resistance of Plutonium Based on Decay Heat

The present paper is prepared for the peaceful use of nuclear energy. Proliferation resistance of plutonium can be enhanced by increasing the decay heat of plutonium. For example, it can be enhanced by increasing the isotopic fraction of ²³⁸Pu, which has the largest decay heat among plutonium isotopes. In the present paper, the proliferation resistance of plutonium was evaluated based on decay heat with a physical assessment model. New criteria were proposed to evaluate the proliferation resistance based on isotopic compositions of plutonium from the viewpoint of decay heat. The present criteria were applied to evaluate the proliferation resistance of plutonium produced in typical Light Water Reactor and Fast Breeder Reactor based on an evaluation function “Attractiveness” as case studies.