配筋梯度混凝土梁刚度实用计算方法

为探索由受压区采用高强高性能混凝土、拉区采用普通混凝土形成的配筋梯度混凝土受弯构件的变形性能,开展了三分点加载下该类简支梁试验.报道了配筋梯度混凝土简支梁截面应变与挠度试验结果,与仿真分析结果进行对比.基于试验结果,揭示了使用荷载下该类梁压区边缘混凝土平均应变与外荷载的线性发展规律,给出该类梁压区边缘混凝土平均应变综合...     

基于逆序信号驱动的紧密衔接综合调度算法

针对以往综合调度中紧密衔接调度算法只能处理单一紧前工序的情况,使算法具有局限性问题,提出基于逆序信号驱动的紧密衔接综合调度算法.该算法先建立设备和调度2个子系统,并通过相互间传递的信号驱动逆序调度;对于紧密衔接工序组包含非单一紧前工序的情况,将紧密衔接工序组定义为一棵特殊的紧密衔接子树,采用逆序调度的方式自顶向下对紧密衔接问题求解;当信号驱动时刻存在多个可调度工序(组)时,按最大可并行性选择策略选择子节点关键路径长的工序(组)调度;对于可调度工序直接锁定该工序的加工时间段;对于可调度工序组,则按锁定紧密衔接工序组的前沿贪心策略锁定工序组的加工时间段.由于采用逆序调度和锁定紧密衔接工序组的前沿贪心策略,可使各紧密衔接工序组独立调度,实现紧密衔接紧前工序数无限制的综合调度.     

煤矿坚硬顶板活动过程中声发射特征的初步研究

本文分析了“DKJ—1—D”声发射子系统在北京矿务局木城涧矿千军台坑坚硬顶板条件下的监测试验结果,初步探讨了老顶周期来压和直接顶初次垮落期间的声发射特征,并提出了用声发射预报来压的可行性及方法;这对指导煤矿安全生产具有重要的应用价值。     

Oral bioavailability enhancement of flubendazole by developing nanofibrous solid dosage forms

The bioavailability of the anthelminthic flubendazole was remarkably enhanced in comparison with the pure crystalline drug by developing completely amorphous electrospun nanofibres with a matrix consisting of hydroxypropyl-β-cyclodextrin and polyvinylpyrrolidone. The thus produced formulations can potentially be active against macrofilariae parasites causing tropical diseases, for example, river blindness and elephantiasis, which affect altogether more than a hundred million people worldwide. The bioavailability enhancement was based on the considerably improved dissolution. The release of a dose of 40?mg could be achieved within 15?min. Accordingly, administration of the nanofibrous system ensured an increased plasma concentration profile in rats in contrast to the practically non-absorbable crystalline flubendazole. Furthermore, easy-to-grind fibers could be developed, which enabled compression of easily administrable immediate release tablets.     

基于信息化平台的微教学模式探索

信息时代对传统的城乡规划学科教学模式转变起着深刻的推动作用,学生的学习方式、生活节奏、知识结构本身都正发生巨大的转变.传统的固定式设计课程教学过程已经不能完全满足新的城市规划教学需求.本文阐述了基于信息化平台的“微教学”教学模式的内涵特征,提出开放联动式、协作研讨式、师生交互式、情景再现式四种教学模式.在此基础上,探索以碎片化教学为基础的即时短促教学单元,以感性设计与理性逻辑共同培养为核心的开放式教学单元,以突出个人能力为目标的激励式教学方式,以师生互动为核心的教学反馈模式和以信息交流为平台的多元化教学模式五种培养方式,弥补传统教学模式的不足,激发城市规划专业学习的主动性和积极性.     

The relationship between semantic short-term memory and immediate serial recall of known and unknown words and nonwords: Data from two Chinese individuals with aphasia.

The present study investigated verbal recall of semantically preserved and degraded words and nonwords by taking into consideration the status of one's semantic short-term memory (STM). Two experiments were conducted on 2 Chinese individuals with aphasia. The first experiment showed that they had largely preserved phonological processing abilities accompanied by mild but comparable semantic processing deficits; however, their performance on STM tasks revealed a double dissociation. The second experiment found that the participant with more preserved semantic STM had better recall of known words and nonwords than of their unknown counterparts, whereas such effects were absent in the patient with severe semantic STM deficit. The results are compatible with models that assume separate phonological and semantic STM components, such as that of R. C. Martin, M. Lesch, and M. Bartha (1999). In addition, the distribution of error types was different from previous studies. This is discussed in terms of the methodology of the authors' experiments and current views regarding the nature of semantic STM and representations in the Chinese mental lexicon. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

福州市新一轮近期建设规划思考

本文结合福州市新一轮近期建设规划,提出选准近期重点发展区域、加强非建设用地管制、优化城市交通网络、完善旧屋区改造政策等思路。     

直接顶的临界高度与支架工作阻力分析

运用数值计算方法分析了采场不同高度直接顶的变形破坏特征，提出直接顶的“临界高度‘（ｈｃｒ）概念，将直接顶按临界高度进行分类，指出当直接顶高度Σｈ≥ｈｃｒ时，不能单纯以顶板下沉量来判别顶板是否稳定，而要综合考虑端面顶板的稳定 。在此基础上提出当Σｈ≥ｈｃｒ时确定支架工作阻力应注意的问题。     

基于遗传算法和BP网络的岩爆预测

选取影响岩爆的一些关键指标,例如脆性系数、弹性应变能指数、应力强度比等作为输入参数,采用经遗传算法优化过的BP网络,对岩爆的发生及其烈度进行了预测.针对国内外一些地下工程的实例进行了分析计算,预测结果与实际情况是符合的,说明这种方法有一定的实际意义.     

直接式污水源热泵系统技术优势与新进展

直接式污水源热泵技术是未来污水源热泵的主导方向。本文介绍了直接式污水源热泵系统的构成,分析了各种直接式污水源热泵系统形式的特点和应用要点,并将之与间接式系统进行了全面的技术经济性对比分析,指出了直接式系统的巨大优势。在总结间接式污水源热泵系统技术储备及其对直接式系统的发展贡献基础上,介绍了我国直接式污水源热泵系统技术的最新进展。