摘要：Why do some room and pillar retreat panels encounter ab.ormal conditions? What factors deserve the most consideration during the planning and execution phases of mining and what can b. done to mitigate those ab.ormal conditions when they are encountered? To help answer these questions, and to determine some of the relevant factors influencing the conditions of room and pillar(R & P) retreat mining entries, four consecutive R & P retreat panels were evaluated. This evaluation was intended to reinforce the influence of topographic changes, depth of cover, multiple-seam interactions, geological conditions, and mining geometry. This paper details ob.ervations were made in four consecutive R & P retreat panels and the data were collected from an instrumentation site during retreat mining. The primary focus was on the differences ob.erved among the four panels and within the panels themselves. The instrumentation study was initially planned to evaluate the interactions b.tween primary and secondary support, b.t produced rather interesting results relating to the loading encountered under the current mining conditions. In addition to the ob.ervation and instrumentation, numerical modeling was performed to evaluate the stress conditions. b.th the La Model 3.0 and Rocscience Phase 2 programs were used to evaluate these four panels. The results of b.th models indicated a drastic reduction in the vertical stresses experienced in these panels due to the full extraction mining in overlying seams when compared to the full overb.rden load. b.th models showed a higher level of stress associated with the outside entries of the panels. These results agree quite well with the ob.ervations and instrumentation studies performed at the mine. These efforts provided two overarching conclusions concerning R & P retreat mine planning and execution. The first was that there are four areas that should not b. overlooked during R & P retreat mining: topographic relief, multiple-seam stress relie

摘要：Au 被装载了(1% wt ) 在不同广告上，氧化物支持(CuO， La2O3， Y2O3， NiO ) 由三个不同方法：两倍受精(暗淡) ，液体阶段减少的免职(LPRD ) ，和 ultrasonication (美国) 。样品被 N2 吸附描述在 ? 196 ??  ??????  ??  ? 洠浡業汬牡 ?  ???? 猠'T 業牣吗？

摘要：提出一种新的能量转化装置——内馈式感应发电机,叙述了其运行方式;并在内馈式感应发电机为主要动力装置的基础上建立可再生能源综合系统,给出了系统结构图,阐述各个系统元件之间的相互关系。

摘要：关于惊险影片的研究,实际上是关于电影艺术祥式多样化、电影与观众关系研究的一部分。通常认为,惊险影片是较受观众欢迎的样式,比较容易获得成功。这种看法不是没有根据的。国内外有关此种样式影片的发行放映情况调查以及社会学家、电影学家们有关观众兴趣、欣赏标准的研究资料都可以证明:主观性强、充满悬念、情节曲折的惊险影片附合大多数观众的欣赏心理和审美要求,尤其符合电影的基本观众——年青人的欣赏心理和审美要求。年青人希望在观看惊险影片的过程中获取新鲜感、紧张感和兴奋感,因此,他们很容易与影片中的英雄行为、浪漫主义和高尚的冒险行为认同。各国惊险影片大多从本民族的历史文化和当代生活中汲取情节素材,表现出人民性格中热爱白由、热爱生活、顽强斗争的优秀品质。惊险影片具有情节素材的尖锐性、心理冲突的丰富性和外部动作的戏剧性等特点。惊险影片的情节开展是急剧变化的,它的主人公往往要经历艰难困苦的冒险命运。可以说,具有如此丰富艺术手段的惊险片样式,必定能够强烈地作用于观众。因此,它如果不是“注定”成功,也 必然会经常处于观众的注意范围之内。 然而,从事这一领域创作的艺术家们也面临着一系列并非轻松的问题。近年来,苏联惊险电影的发展遇到了不少困难,苏联惊险电影向?

摘要：为察觉到应用程序被介绍的推迟核心的纤维上的简短评论。在光纤维被描述的关于这特殊设计微观结构的以前的十年的历史的概述。这纤维介绍吸引人的光性质因为化学 / 生物或煤气的测量，而是它能进一步为也就是，察觉到解决方案的选择被探索在里面纤维干涉仪基于推迟核心或 suspended-multi-core 纤维，为物理参数监视。

摘要：本文针对摩擦学系统的特点,详细地研究了一类有代表性的摩擦学系统—大型汽轮发电机组转子轴承系统——的摩擦学—动力学设计数据库。说明了摩擦学—动力学设计数据库的设计过程,以及摩擦学—动力学设计数据库的结构和功能。

摘要：The rapid development in the digital circuit design enhances the applications on very large scale integration era. Encoders are one among the digital circuits found in all communication systems. The polar encoding is mainly meant for its channel achieving property. It finds its application in communications, sensing and information theory. This coding proposed b. Erdal Arikan is significant b.cause of its zero error floors and simple architecture for hardware implementation. In this paper, a folded polar encoder is designed to start from the fully parallel architecture and proceeds with its data flow graph, delay requirement calculation, lifetime analysis and register allocation, which results in a very large scale integration architecture with minimum hardware utilization. The results are simulated for 4 and 8 parallel folded 32-b.t polar encoder using Xilinx 14.6 ISIM and implemented in Virtex 5 field programmab.e gate array. A comparison is made on fully parallel and various folding techniques b.sed on their resource utilization.

摘要：手术麻醉的发明是美国医学对世界做出的第一个重大贡献。直到今天,它仍然是我们对治疗艺术最好的礼物。与150年前美国人组成的小团队所取得的成就相比,在20世纪取得的辉煌进步,以及众多的诺贝尔奖获得者都不能让其黯然失色。

摘要：在一切艺术中,也许正是电影能够最明显地(首先是由于它今天已被电视手段扩大化了的群众性)反映出人们生活的精神氛围和社会存在的方式与实质。银幕艺术的观众真是无穷无尽的,而它对人的个性形成过程的影响则不须重新估计。

摘要：此次视觉探索的目的是调查不同文化对符号系统的影响，特别是公共交通环境内的符号系统。象形标识系统简单地将重要信息和指引传递给所有文化背景的人们，被认为是不同语言之间的沟通桥梁。然而，我相信：世界各地的人们对这些符号的反应理解可能因其文化背景、性别、语言、年龄和文化程度的不同而有所差异，基于此，我进行了此次视觉探索，开始对这一概念提出视觉挑战，同时也从这一探索过程中获得了乐趣。1974年，美国运输部委托美国平面艺术学院创作一套旅客和行人出行指引的经典标识，这套标志最终由Roger Cook和Don Shanosky设计绘制。