Progress in reducing AC magnetization losses of Bi2223/Ag tapes by introducing interfilamentary oxide barriers

This paper presents our recent progress for the development of low-loss Bi2223/Ag tapes with interfilamentary oxide barriers. For the compatibility with Bi2223 superconductors, SrZrO3 was selected as barrier material. Moreover, small amount of Bi2212 was mixed with SrZrO3 to improve its ductility for cold working. By controlling the thickness of barrier layers among the filaments, reducing the tape wi dth (<3 mm) and twisting the filaments tightly (<5 mm in twist pitch lengths), coupling frequency fc exceeded 250 Hz even in an AC perpendicular field at 77 K. Transport Jc of the barrier tapes with tightly twisted filaments was in the range of 12 ? 15 kA/cm² at 77 K and self-field. At 50 mT and 50 Hz, the twisted barrier tapes showed 60% ? 70% lower perpendicular field losses than the conventional 4 mm-widt h tape with fully coupled filaments.     

有阻隔情况下土地定级因素因子作用分值算法研究

城镇土地定级中定级因素因子作用分值计算难度较大、情况复杂、计算量大,特别是有阻隔存在情况下更是如此.作用分值计算直接影响定级成果的精度.以达州市城市土地定级为例,讨论栅格数据空间分析方法在定级因素作用分值计算中的应用.结果表明,栅格数据空间分析方法可以用于计算定级要素作用分值;特别在有阻隔存在的情况下,能够提高定级效率和定级成果的精度.     

透过磁垒的波矢相关电子隧道效应

本文首先简要推导特定非均匀磁场作用下二维电气气的薛定谔方程，其次对实际材料中产生的４种微观磁垒的等价ｑ－矢相关电子势进行了数值计算和讨论；     

谈情感教学

"情感"是教学活动能否成功的重要影响源,什么是情感教学、情感教学的基本要素、情感教学的功能和情感教学的实施等四个方面是值得探讨的。     

The potential significance of microbial activity in radioactive waste disposal

Summary Active microorganisms can exist in any proposed environment if the basic requirements for life are satisfied, i.e. a suitable temperature and pH, the presence of the necessary nutrients and water. If conditions are not favourable microbes may survive in a dormant state until a change will allow activity. In local pockets microenvironments may become established where microbial activity may increase leading to altered environmental conditions and to changes in the near-field, e.g. degradation and breakdown of barriers, gas generation and/or uptake and transport of nuclides.     

WTO协调环境和贸易问题的规则对发展中国家的不利影响——从信息不对称理论分析

环境和贸易矛盾的实质在于发达国家和发展中国家经济发展水平的差异,该差异决定了发达国家和发展中国家之间存在信息不对称,主要是知识拥有量的不对称,从而使得WTO协调环境和贸易的规则在制定和执行中给发展中国家带来不利影响(绿色贸易壁垒),而环境问题的解决不仅仅需要发展中国家的努力。     

新贸易壁垒对我国农产品出口的影响及对策研究

随着国际贸易的迅速发展,国际经济也进入了贸易摩擦的高发阶段,国际农产品贸易环境日趋复杂。与此同时,国际农产品贸易壁垒出现了诸多新特征,“知识产权壁垒”、“舆论壁垒”等新型贸易壁垒的出现使得我国农业在相当长的一段时期内将面临极其复杂的国际竞争环境。我国农产品进入国际市场难度加大的同时,也必将削弱农产品的竞争力。面对这种困境,我国政府和农产品出口企业应当适时采取相应对策,以保护我国农业大国地位。     

Conflict adaptation in the perception of emotional valence in a Stroop task

Interference effects are commonly observed when conflicts arise between task-relevant and task-irrelevant dimensions of stimuli. Compared with responses to congruent trials in which the two dimensions are compatible, responses to incongruent trials are usually slower and less accurate. Moreover, the performance in a given trial is affected by the nature of the preceding trial, in that the interference effect for the current incongruent trial is reduced when it follows an incongruent trial than when it follows a congruent one. This conflict adaptation effect has been generally ascribed to the functioning of the cognitive control system, in which higher controls are recruited after conflicts to further constrain the processing of the task-irrelevant dimension. However, due to its uniqueness in neural and cognitive processes, whether the perception of emotional valence shows the same conflict adaptation effect in the conflicting context is an open question. This study adopted a variant of the Stroop task in which the task-relevant dimension was the affective facial expression while the task-irrelevant dimension was the meaning of an emotional word superimposed on the face. Results suggest that the perception of emotional valence in the conflicting context can have aspects that are both similar and dissimilar to the control of conflict for non-emotional information. The capturing of attention by emotional information can alter the functioning of the cognitive control system.     

托马斯·哈代:情与理的双重变奏

托马斯·哈代一生跨越两个世纪，浓郁的乡情使他对传统生活充满着强烈眷爱，冷静的理性精神又促使他审视着现代文明所代表的社会进步，以及传统与现代的交锋。哈代就是在这种情与理的双重变奏下从事创作的。     

高职数学课堂教学中情感因素的激励作用

恰当地利用情感因素，激发学生心灵对知识的感触，从而在数学课堂教学的舞台上导演出一部优秀作品，使课堂教学达到最大限度的优化。