论图书馆管理的人本主义价值取向   总被引：17，自引：0，他引：17  

桑晓东  宋书星 《图书情报工作》2003,46(9):40-44

在科学管理与人本管理比较的基础上,提出图书馆应坚持科学管理与人本管理、科学精神与人文精神相统一;并简要分析现行图书馆规章制度的缺失及其修订完善所应遵循的基本原则。指出,管理体制“软件”现代化是图书馆现代化建设不容忽视的重要内容。  相似文献   

衰老自由基学说和运动对抗自由基损伤的作用   总被引：2，自引：0，他引：2  

桑琛  李明学 《吉林体育学院学报》2007,23(1):80-81,140

从自由基的产生、清除以及对机体的损害作用几方面概述了衰老的自由基学说.并说明运动对机体自由基的产生和清除随运动方式、运动强度、运动时间的不同而产生相反的效应,指出长期的有氧运动可以抑制自由基的产生并提高机体的抗氧化能力,对延缓衰老有着不可忽视的作用.  相似文献   

中国成人教育之“根”：社区成人教育？——与南海先生“社区说”商榷     

桑宁霞 《河北大学成人教育学院学报》2008,10(2):5-7

针对南海先生提出的“中国成人教育之‘根’：社区成人教育”，本文提出质疑。笔者认为原文在概念厘定、宏观把握、未来预测等方面都存在不同程度的遗憾，特与作者商榷，以推动学术进步。  相似文献   

Centrifugal multiplexing fixed-volume dispenser on a plastic lab-on-a-disk for parallel biochemical single-end-point assays     

Moonwoo La  Sang Min Park  Dong Sung Kim 《Biomicrofluidics》2015,9(1)

In this study, a multiple sample dispenser for precisely metered fixed volumes was successfully designed, fabricated, and fully characterized on a plastic centrifugal lab-on-a-disk (LOD) for parallel biochemical single-end-point assays. The dispenser, namely, a centrifugal multiplexing fixed-volume dispenser (C-MUFID) was designed with microfluidic structures based on the theoretical modeling about a centrifugal circumferential filling flow. The designed LODs were fabricated with a polystyrene substrate through micromachining and they were thermally bonded with a flat substrate. Furthermore, six parallel metering and dispensing assays were conducted at the same fixed-volume (1.27 μl) with a relative variation of ±0.02 μl. Moreover, the samples were metered and dispensed at different sub-volumes. To visualize the metering and dispensing performances, the C-MUFID was integrated with a serpentine micromixer during parallel centrifugal mixing tests. Parallel biochemical single-end-point assays were successfully conducted on the developed LOD using a standard serum with albumin, glucose, and total protein reagents. The developed LOD could be widely applied to various biochemical single-end-point assays which require different volume ratios of the sample and reagent by controlling the design of the C-MUFID. The proposed LOD is feasible for point-of-care diagnostics because of its mass-producible structures, reliable metering/dispensing performance, and parallel biochemical single-end-point assays, which can identify numerous biochemical.  相似文献   

Structural design of a double-layered porous hydrogel for effective mass transport     

Hyejeong Kim  Hyeon Jeong Kim  Hyung Kyu Huh  Hyung Ju Hwang  Sang Joon Lee 《Biomicrofluidics》2015,9(2)

Mass transport in porous materials is universal in nature, and its worth attracts great attention in many engineering applications. Plant leaves, which work as natural hydraulic pumps for water uptake, have evolved to have the morphological structure for fast water transport to compensate large water loss by leaf transpiration. In this study, we tried to deduce the advantageous structural features of plant leaves for practical applications. Inspired by the tissue organization of the hydraulic pathways in plant leaves, analogous double-layered porous models were fabricated using agarose hydrogel. Solute transport through the hydrogel models with different thickness ratios of the two layers was experimentally observed. In addition, numerical simulation and theoretical analysis were carried out with varying porosity and thickness ratio to investigate the effect of structural factors on mass transport ability. A simple parametric study was also conducted to examine unveiled relations between structural factors. As a result, the porosity and thickness ratio of the two layers are found to govern the mass transport ability in double-layered porous materials. The hydrogel models with widely dispersed pores at a fixed porosity, i.e., close to a homogeneously porous structure, are mostly turned out to exhibit fast mass transport. The present results would provide a new framework for fundamental design of various porous structures for effective mass transport.  相似文献   

宁夏六盘山片区生态移民科技需求实证研究     

张庆霞  牛国元  赵功强  苗冠军  刘艳华 《科技管理研究》2014,(23)

以宁夏六盘山片区116户县内生态移民为典型案例,通过实证调研的方法研究农民对科技知识需求的意愿及其影响因素。结果表明,93.40%的生态移民认可科学技术对改善生活、提高生产的作用,并且对学习掌握科技知识有着较强的需求意愿。分析发现,年龄、性别、文化程度、家庭收入是影响生态移民对科技知识需求强度的主要因素。最后,针对不同层次生态移民的科技需求现状提出相应的对策建议。  相似文献   

An unexpected particle oscillation for electrophoresis in viscoelastic fluids through a microchannel constriction     

Xinyu Lu  Saurin Patel  Meng Zhang  Sang Woo Joo  Shizhi Qian  Amod Ogale  Xiangchun Xuan 《Biomicrofluidics》2014,8(2)

Electrophoresis plays an important role in many applications, which, however, has so far been extensively studied in Newtonian fluids only. This work presents the first experimental investigation of particle electrophoresis in viscoelastic polyethylene oxide (PEO) solutions through a microchannel constriction under pure DC electric fields. An oscillatory particle motion is observed in the constriction region, which is distinctly different from the particle behavior in a polymer-free Newtonian fluid. This stream-wise particle oscillation continues until a sufficient number of particles form a chain to pass through the constriction completely. It is speculated that such an unexpected particle oscillating phenomenon is a consequence of the competition between electrokinetic force and viscoelastic force induced in the constriction. The electric field magnitude, particle size, and PEO concentration are all found to positively affect this viscoelasticity-related particle oscillation due to their respective influences on the two forces.  相似文献   

Study for optical manipulation of a surfactant-covered droplet using lattice Boltzmann method     

Se Bin Choi  Sasidhar Kondaraju  Joon Sang Lee 《Biomicrofluidics》2014,8(2)

In this study, we simulated deformation and surfactant distribution on the interface of a surfactant-covered droplet using optical tweezers as an external source. Two optical forces attracted a single droplet from the center to both sides. This resulted in an elliptical shape deformation. The droplet deformation was characterized as the change of the magnitudes of surface tension and optical force. In this process, a non-linear relationship among deformation, surface tension, and optical forces was observed. The change in the local surfactant concentration resulting from the application of optical forces was also analyzed and compared with the concentration of surfactants subjected to an extensional flow. Under the optical force influence, the surfactant molecules were concentrated at the droplet equator, which is totally opposite to the surfactants behavior under extensional flow, where the molecules were concentrated at the poles. Lastly, the quasi-equilibrium surfactant distribution was obtained by combining the effects of the optical forces with the extensional flow. All simulations were executed by the lattice Boltzmann method which is a powerful tool for solving micro-scale problems.  相似文献   

地方本科院校生物工程专业复合型人才培养模式的探索与实践     

戴余军  李国元  田春元  李长春  仇小艳 《科教文汇》2014,(8):49-50

地方本科院校根据市场需求,结合学校总体定位,构建复合型人才培养模式的方案,通过教学条件建设和制度建设,确保方案的顺利实施,提高人才培养质量,培养出适应经济社会发展要求的复合型专业人才。  相似文献   

赵元任和胡适     

桑逢康 《文化交流》2009,(2):24-26

留美学友 1910年7月赵元任和胡适同时在北京报考第二批庚款官费留学美国，赵元任在榜上名列第二，胡适列第五十五名。这一年8月16日，包括胡适和赵元任在内的这一批青年学子共71人，从上海乘轮船赴大洋彼岸的美国。  相似文献