茶树品种分类的探讨

  It is generally accepted that tea plant (Thea sinensis L.) is originated in China, where has numerous varieties,  According to the literature, the selected work of tea plants may be traced as early as to the 3rd-5th century A.D.  The number of varie- ties discovered in recent years reached more than 300.  Besides, a large number of wild species were discovered. In all tea varieties, the crown canopy, leaf size and the date of sprouting were different.  It was proposed that according to the crown canopy, leaf size and the date of sprouting.   The  principle of the classification  of Chinese tea varieties may be 3 orders.  The first order named “group”, it contains macrophanerophyte group, microphanerophyte group, and frutex group.  The second order named “type”, it contains extreme large leaf size, large leaf size, medium leaf size and small leaf size.  The third order named “species”, it contains the early- sprouting species, medium-sprouting species and late-sprouting species.       

具有二次性能指标的最优输出反馈的一个必要条件

本文用矩阵的秩这个工具考察了有限维线性系统具有二次性能指标的最优输出反馈问题，得到了一个必要条件。特殊情形下，这一条件可以演化为最优输出反馈增益与观测矩阵的乘积即为状态反馈增益这个相当清晰的关系。     

黑河下游地区土地荒漠化及其治理

土地荒漠化的表现有：湖泊干涸；地下水位下降和水质恶化；植被退化；土壤盐渍化；土地风蚀沙化。治理荒漠化的意见：迅速解决水源，加强绿洲的巩固和建设。     

角色背后的人性——读《警察的疏忽与罪犯的侥幸》有感

本文论述了监管环境中疏忽与侥幸的原因与表现以及其概念延伸,并探讨了如何克服疏忽与消除侥幸,从而将疏忽与侥幸降至最低,以确保监狱的安全稳定。     

社会主义核心价值体系融入大学生思想政治教育的思考

社会主义核心价值体系与大学生思想政治教育密不可分,要提高大学生的思想政治素质,就必须深刻把握社会主义核心价值体系的科学内涵,积极探索有效的教育途径,将社会主义核心价值体系融入大学生思想政治教育工作中。     

Construction and operation of a microrobot based on magnetotactic bacteria in a microfluidic chip

Magnetotactic bacteria (MTB) are capable of swimming along magnetic field lines. This unique feature renders them suitable in the development of magnetic-guided, auto-propelled microrobots to serve in target molecule separation and detection, drug delivery, or target cell screening in a microfluidic chip. The biotechnology to couple these bacteria with functional loads to form microrobots is the critical point in its application. Although an immunoreaction approach to attach functional loads to intact MTB was suggested, details on its realization were hardly mentioned. In the current paper, MTB-microrobots were constructed by attaching 2 μm diameter microbeads to marine magnetotactic ovoid MO-1 cells through immunoreactions. These microrobots were controlled using a special control and tracking system. Experimental results prove that the attachment efficiency can be improved to ∼30% via an immunoreaction. The motility of the bacteria attached with different number of loads was also assessed. The results show that MTB can transport one load at a velocity of ∼21 μm/s and still move and survive for over 30 min. The control and tracking system is fully capable of directing and monitoring the movement of the MTB-microrobots. The rotating magnetic fields can stop the microrobots by trapping them as they swim within a circular field with a controllable size. The system has potential use in chemical analyses and medical diagnoses using biochips as well as in nano/microscale transport.     

Electrowetting on dielectric driven droplet resonance and mixing enhancement in parallel-plate configuration

This study experimentally verifies that the mixing process in a droplet can be enhanced by driving the droplet at resonant frequencies and at alternating driving frequencies using a parallel-plate electrowetting on dielectric device. The mixing time, which is defined as the time required for reaching the well-mixed state, in a resonant droplet is found to be significantly shorter than that in a non-resonant droplet. Besides, it is also found that a higher driving potential leads to a better mixing effect, especially at resonant frequencies. Furthermore, when a droplet is driven by alternating two driving frequencies, especially two resonant frequencies, the mixing efficiency is found to be significantly enhanced for a specific alternating duration of these two frequencies.     

近十年社科院系统国家社科基金项目统计分析

根据全国哲学社会科学规划办公室网站公布的国家社科基金项目立项资料,重点分析2001-2010年社科院系统承担的国家社科基金立项的基本情况、特点,借以探讨社科院系统在国家高水平的社会科学研究中的现状及十年间变化状况。     

科技投入与区域经济协调发展评价研究

科技投入是科技活动的源头,是实现产业升级、推动经济发展的重要前提.以黑龙江省为例,通过建立科技投入与区域经济发展评价指标体系,运用因子分析方法对黑龙江省1999-2008年科技投入与区域经济发展的综合水平进行了测度,并根据测度综合水平与回归分析结果,利用所构建的科技投入和区域经济协调发展度模型,对科技投入与经济发展协调状况进行定量测算,最后基于实证分析科技投入与经济协调发展中存在问题,并结合实际提出若干建议.