开架服务新议     

黄国强  王小云 《图书馆论坛》1992,(4):61-62

图书馆作为用户与文献情报资源之间的接口而存在,其基本功能在于努力获取与用户情报需求相吻合的文献资料,并以各种有效方式进行科学的组织与加工,提供给用户使用。在实现这一功能的过程中,文献情报资料的提供和服务方式是非常重要的一环,其方式的优劣、质量的高低,直接关系着图书馆的藏与用。由于诸多因素的影响和制约,我国大多数图书馆长期采用闭架方式(有时对部分用户开架)向用户提供借阅服务。而图书馆的用户总是希望自由地直接面对馆藏,自由地翻阅和浏览馆藏,选取符合自身实际需要的情报资料。但是,闭架服务方式使  相似文献   

体育装备高科技化的利与弊     

黄国强 《中国现代教育装备》2011,(11):43-44,48

科技的进步如何促进体育的发展,又如何威胁体育竞赛的公平性,笔者从体育装备科技化对体育运动的影响作辩证思考。  相似文献   

中学生100米跑力量训练之探讨     

徐世民 《中华武术》2010,(8):3-5

一、短跑的特征 现代短跑运动最核心的东西就是以髋为轴的高速摆动一平动运动，以及在高速跑动中的放松技能。传统的短跑理论强调后蹬，破坏了用力的连续性，会使身体重心轨迹波动较大，降低了整体运动的效果，影响运动成绩。  相似文献   

浅谈少年中跑运动员的有氧能力训练     

徐世民  汪玉杰 《哈尔滨体育学院学报》2003,21(2)

通过对影响有氧能力因素的理论分析、结合当前少年中跑运动员的训练现状,指出发展有氧能力对少年中跑运动员运动能力的重要性,并就发展中跑运动员有氧能力的训练方法,提出训练建议,供训练界同仁参考。  相似文献   

文献资源的重组,再生及网络化建设   总被引：1，自引：0，他引：1  

黄国强 《图书馆论坛》1994,(6):11-12,54

文献资源的重组、再生及网络化建设黄国强（广东科技图书馆）当时代之轮驰向信息化之路，社会主义经济建设正跃步腾飞之时，我国图书情报事业的发展却陷入了举步维艰的境地。一方面是背负着历史与传统的沉重十字架，另一方面是受到新时期经济建设所带来的大量文献需求的冲...  相似文献   

Shortcut Algorithm for Simulation of Batch Extractive Distillation     

邬慧雄  徐世民  胡晖  肖斌 《天津大学学报(英文版)》2007,13(6):428-432

The batch extractive distillation (BED) process has the advantages of both batch and extractive distillation. It is one of the most promising means for the separation of azeotropic and close-boiling point systems. However, so far this process has not been applied in industry due to its over-complexity. A new shortcut model was proposed to simulate the operation of the batch extractive distillation operations. This algorithm is based on the assumption that the batch extractive distillation column can be considered as a continuous extractive distillation column with changing feed at any time. Namely, the whole batch process is simulated as a succession of a finite number of steady states of short duration, in which holdup is considered as constant mole. For each period of time the batch extractive distillation process is solved through the algorithm for continuous extractive distillation. Finally, the practical implementation of the shortcut model is discussed and data from the laboratory and literature are presented. It is found that this model has better adaptability, more satisfactory accuracy and less calculative load than previous rigorous model. Hence the algorithm for simulating BED is verified.  相似文献   

Recovery of Dilute Acetic Acid by Catalytic Distillation Using NKC-9 as Catalyst     

张志刚  李晓峰  徐世民  李鑫钢 《天津大学学报(英文版)》2006,12(4):264-270

The reaction kinetics of dilute acetic acid with methanol using NKC-9 as catalyst was studied at temperatures of 308 K, 318 K, 323 K, 328 K. The kinetic model based on Langmuir-Hinshel-wood rate model was derived and the activation energy was 6.13×104 kJ/kmol. The experiment of recovery of dilute acetic acid was conducted in a packed bed catalytic distillation column. The optimal process parameters and operational conditions determined to make up to 85.9% conversion of acetic acid are as follows:the height of catalyst bed is 1 100 mm, reflux ratio is 4:1, and the ratio of methanol to acetic acid is 2:1. The method can be used as a guide in industrial scale recovery of 15%-30% dilute acetic acid.  相似文献   

Charactedzations of PSD Fractal of Porous Medium     

黄国强徐世民  李鑫钢 《天津大学学报(英文版)》2003,9(3):170-173

A volume-based method for measuring particle-size distribution (PSD) fractal dimensions of porous mediums was developed by employing laser size-analyzing technology. Compared with conventional approaches of using hydrometer or screen to determine PSD, this method can avoid calculation errors and measure smaller size-scale porous medium. In this paper the experimental porous mediums were brown soil, kaolin and sand soil. A micro-order of magnitude ( 10 ^-5 m) in particle-size interval could be shown in PSD results of brown soiland kaolin. The experiments indicated that brown soil had a nearly mono-fractal PSD character, while kaolinand sand soil showed multi-fractal PSD characters. By the adsorption isotherm experiments, the PSD fractal dimensions of the sand soil were also found to keep a linearly increasing relation with the linear adsorptive parameters of the soils in different intervals to adsorb benzene from aqueous solution.  相似文献   

马克思对近代哲学和科学冲突的超越     

徐世民 《佳木斯教育学院学报》2012,(3):18+20

近代哲学为解决自身危机大力引进自然科学方法,造成内部理性主义与经验主义的分裂。而自然科学却排斥哲学的存在并要将世界统一到完整的机械世界图景当中。哲学和科学的近代冲突终于导致了三个方面的危机和问题,而马克思的思想探索之路深受此背景的影响,他必须克服和超越。历史唯物主义对旧社会科学三种形态进行了超越,从而给予马克思主义以牢固的科学性。  相似文献   

中学生口头表达能力培养之我见     

黄国强 《基础教育研究》2013,(11):61

对于中学生来说,提高他们的口头表达能力,不仅能促进读写能力的提高,而且还能促进思维能力的发展,从而提高语文水平和综合素质。因此,在中学语文教学中,注重对学生口头表达能力进行培养就显得非常重要。1.通过鼓励发言树立自信处于青春期的中学生比较注重自己在大家(尤其是异性)面前的表现,害怕因言行不当而影响自己的形象,因此在公众场合说话时显得腼腆,小心翼翼。这就要求教师在教学中鼓励学生发言,努力激发他们  相似文献