用钻孔瓦斯涌出初速度法进行浅孔预测的可行性研究

针对目前使用钻孔瓦斯涌出初速度法(q值法)预测煤与瓦斯突出所存在的问题,进行了多钻孔、多孔深的现场试验,研究了用钻孔瓦斯涌出初速度法进行浅孔预测的可行性.根据实测的不同深度的曲线变化,确定了替代的测试孔深及突出临界值.     

Three-dimensional finite element analysis of critical pre-twist strain angle for torsional axis

A three-dimensional clasto-plastic finite element analysis of pre-twist process for a torsional axis made of 45GrNiMoVA steel, was carried out using a commercial finite element analysis code, MSC MARC 2001. The results show that the critical pre-twist strain angle is 0.027 rad and the maximum elastic shear stress after pre-twist is 1 694 MPa for the torsional axis. Foundation item: Project (41327040101) supported by General Equipment Ministry of PLA of China     

Resource assessment of copper deposits in China

Copper-bearing deposits of China are statistically analyzed in terms of ore grade, metal amount and ore tonnage. Each of grade and metal amount shows more or less a lognormal distribution. Analysis gives 10 copper metallogenic districts, each having specific densities of deposit numbers and copper reserves larger than 3. Based on the ratio of copper in ore value (R _Cu), Chinese copper deposits are classified into two groups: mainly copper-producing deposits (MC: R _Cu⩾0.5) and accessorily copper-producing deposits (AC: R _Cu<0.5). The grade-tonnage relation of MC deposits can be combined by two exponential functions approximating high grade (>3.0%) and low grade (<2.0%) parts. The critical copper grade, which is obtained from the low grade part of the relation, is 0.34%. Chinese copper resources are concluded to become pessimistic, because some mines are working with grades close to this critical value. Taking account of the fact that many copper deposits are actually polymetallic, Cu-equivalent grades, which are converted from ratios of metal prices to the copper price, are also introduced. The critical Cu-equivalent grade of MC deposits (0.43%) also suggests that Chinese copper resources are pessimistic.     

基于概率模型检测的合同签订协议分析

概率合同签订协议的公平性具有典型的概率性质。概率模型检测是一种验证存在随机行为系统的分析技术。基于概率模型检测技术，在原协议的基础上建立了离散马尔可夫链和有限状态机模型，用概率模型检测工具——PRISM验证了它的公平性，发现其公平性不满足时，在此基础上对原协议从双方交换信息的策略上进行了扩充改进，使协议更为公平，满足了合同签订的基本要求。     

基于关键链方法的多项目管理

传统多项目管理中的主要问题表现在级联效应、多任务工作、行为效应等三个方面。本文提出五步骤法将关键链管理中的关键链调度、同步化、缓冲管理应用于多项目管理，建立了关键链多项目管理方法(CCMPM)，并构建了由三个项目组成的多项目环境实例，以工期为评估标准，利用模拟软件Crystal Ball 2000．5模拟项目实施过程，1000次模拟结果显示，经CCMPM优化前后项目平均完工时间为320天／295天，完工保证率为90％的工期为330天／301天。     

Existing State and Partitioning of Rare Earth on Weathered Ores

The existing state and partitioning of rare earth （RE） on weathered ores in Longnan County（LN）, Xingfeng County（XF） and Ninghua County（NH） were characterized systematically by standard geological analytical methods. It is found that RE in the weathered rare earth ores exist as four phases： （a） water soluble, （b） ion-exchangeable, （c） colloidal sediment （oxides）, （d） minerals, in which mainly as ion exchangeable phase, accounting for nearly 80% of total RE, with about 20% in the form of colloid sediment phase and mineral phase, but very little as aqueous soluble phase. These rare earth partitioning were mainly chosen mid-heavy RE elements, occupying above 60%, but not equal in the four phases. The mid-heavy RE elements were primarily enriched in the ion exchangeable phase up to 40%, while the containment of cerium dioxide is below 2 %. The cerium deficiency occurs in the ion exchangeable phase in weathered ore. It results from that the Ce^3＋ is oxidized into Ce^4＋ and changes into CeO2. For LN ore, the containment of Y is high in weathered ore because Y-minerals are abundant in original rock.     

Metallurgical Development in Steel‐plant‐internal Multi‐injection Hot Metal Desulphurisation

The use of thermodynamic, statistical, and light and electron‐optical microscopic methods has made it possible to analyse the course of reactions during steel‐plant‐internal hot metal desulphurisation. The theoretical dependence between oxygen and sulphur activity has been used to develop an EMF‐measurement‐based technique for determining the sulphur content as the hot metal is desulphurised. The absence of magnesium sulphide from the collection of phases in the final slag because of the greater stability and secondary formation of calcium sulphide has been explained with the aid of thermo‐chemical calculations.     

Individual Differences in Susceptibility to False Memory in the Deese-Roediger-McDermott Paradigm.

The authors addressed whether individual differences in the working memory capacity (WMC) of young adults influence susceptibility to false memories for nonpresented critical words in the Deese-Roediger-McDermott associative list paradigm. The results of 2 experiments indicated that individuals with greater WMC recalled fewer critical words than individuals with reduced WMC when participants were forewarned about the tendency of associative lists (e.g., bed, rest, . . .) to elicit illusory memories for critical words (e.g., sleep). In contrast, both high and low WMC participants used repeated study-test trials to reduce recall of critical words. These findings suggest that individual differences in WMC influence cognitive control and the ability to actively maintain task goals in the face of interfering information or habit. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

纳米粒子链/聚合物基复合体的界面形态及力学行为

介绍了纳米粒子链弹性力学属性，粒子链与高分子链缠结和吸附，以及界面形态和力学行为。同时研究原生粒子结合处的“脖颈”对增强高分子聚合物的作用。     

考虑亚稳态的绝热毛细管模型与计算

制冷剂在通过毛细管过程中,存在一个不稳定的亚稳态流动阶段.在考虑亚稳态现象的基础上,基于两相流动的漂移流模型,建立了绝热毛细管内制冷剂流动特性的数学模型.针对工质为R134a的制冷系统开发了绝热毛细管数值模拟程序,并对漂移流模型中的3个重要参数:空隙率、漂移速度和干度进行了计算和分析.该程序在制冷系统毛细管的匹配中具有一定实用价值.