教育细化 管理细致 服务细心——切实做好少数民族学生教育管理工作

中南大学从少数民族学生的特点和实际出发,以“教育细化,管理细致,服务细心”为工作思路,从“细”处着手,积极推行少数民族学生教育管理的“三四五”模式。重点推介了在少数民族民族学生教育管理中抓好“三项”活动、“三个”阶段和培养“三个”素质,以及学校不断完善少数民族学生教育管理机制,从学习、经济、生活、心理、就业等五方面多方位切实解决少数民族学生困难的成功做法。     

Separation of sperm and epithelial cells based on the hydrodynamic effect for forensic analysis

In sexual assault cases, forensic samples are a mixture of sperm from the perpetrator and epithelial cells from the victim. To obtain an independent short tandem repeat (STR) profile of the perpetrator, sperm cells must be separated from the mixture of cells. However, the current method used in crime laboratories, namely, differential extraction, is a time-consuming and labor-intensive process. To achieve a rapid and automated sample pretreatment process, we fabricated a microdevice for hydrodynamic and size-based separation of sperm and epithelial cells. When cells in suspension were introduced into the device''s microfluidic channels, they were forced to flow along different streamlines and into different outlets due to their different diameters. With the proposed microdevice, sperm can be separated within a short period of time (0.5 h for a 50-μl mock sample). The STR profiles of the products in the sperm outlet reservoir demonstrated that a highly purified male DNA fraction could be obtained (94.0% male fraction). This microdevice is of low-cost and can be easily integrated with other subsequent analysis units, providing great potential in the process of analyzing sexual assault evidence as well as in other areas requiring cell sorting.     

海南农业高新技术产业发展探讨

农业高新技术产业是当今最具潜力的领域,农业高新技术产业最本质的特征,就是能最大限度地挖掘现有资源的效益潜力.海南热带农业自然资源丰富,依靠高新技术,振兴农业,将成为海南农业持续、稳定发展的必由之路.     

基于虚拟现实技术的虚拟博物馆设计

本文借助金上京虚拟博物馆可行性预研项目的设计和技术实施,来认识现实虚拟博物馆的技术种类、体验虚拟化文化遗产的审美特征,探索虚拟博物馆的各种功能,判断和总结虚拟博物馆对现代人类社会所能够产生的各种影响等。     

Measuring Knowledge Integration Learning of Energy Topics: A two-year longitudinal study

Although researchers call for inquiry learning in science, science assessments rarely capture the impact of inquiry instruction. This paper reports on the development and validation of assessments designed to measure middle-school students’ progress in gaining integrated understanding of energy while studying an inquiry-oriented curriculum. The assessment development was guided by the knowledge integration framework. Over 2 years of implementation, more than 4,000 students from 4 schools participated in the study, including a cross-sectional and a longitudinal cohort. Results from item response modeling analyses revealed that: (a) the assessments demonstrated satisfactory psychometric properties in terms of reliability and validity; (b) both the cross-sectional and longitudinal cohorts made progress on integrating their understanding energy concepts; and (c) among many factors (e.g. gender, grade, school, and home language) associated with students’ science performance, unit implementation was the strongest predictor.     

钢筋锈蚀对再生混凝土梁柱节点抗震性能的影响

为研究钢筋锈蚀后再生混凝土框架节点的破坏特征和抗震性能,对钢筋未锈蚀、锈蚀而保护层未开裂、平均锈胀裂缝宽度为0．2mm及平均锈胀裂缝宽度为0．4mm四种情况下的再生混凝土及普通混凝土框架边节点,进行了低周反复荷载对比试验;观察节点的受力过程及破坏形态,分析试件的荷载一位移滞回曲线、承载能力、强度和刚度退化、延性以及耗能能力等力学特性．结果表明：相同锈蚀程度下,再生混凝土节点的强度比普通混凝土节点小,再生混凝土节点的刚度退化比普通混凝土节点严重,再生混凝土节点表现出更好的延性,再生混凝土耗能较普通混凝土耗能弱;随着钢筋锈蚀程度的增加,再生混凝土与普通混凝土节点的强度降低,刚度减小,延性减小,耗能能力降低．     

中成药追风透骨丸的急性毒性及药效学研究

急性毒性试验结果表明,NIH小鼠对追风透骨丸的最大耐受量为120g/kg.追风透骨丸12,6,3g/kg可显著延长小鼠热板法致痛的痛阈值,并有量效关系;3个剂量组也可显著抑制醋酸所致的小鼠扭体反应;对棉球所致大鼠肉芽组织增生及鸡蛋清引起的大鼠关节肿胀均有显著的抑制作用。3个剂量组均可显著延迟大鼠实验性体内血栓形成;高剂量组使血浆凝血酶原时间,凝血酶原消耗时间,白陶土部分凝血活酶时间延长;3个剂量组可使大鼠肠系膜微循环血流速度增加,改善微循环状态,降低全血粘度和血浆粘度,并有一定的抗菌作用,对链球菌的最小抑菌浓度为50g/L.     

现代远程教育的教育心理学思考

信息技术的发展,特别是计算机网络技术的发展,给远程教育带来了广阔的发展空间,现代远程教育带来了教学模式和学习方式的巨大变革.由于当前远程教育心理学研究还不成熟,研究现代远程教育的特点,教育心理学与远程教育理论的关系,探讨教育心理学在现代远程教育中的应用是十分重要的.     

从教育成本的特殊性看地方院校教育成本分担机制

随着我国教育体制改革的不断深入,高等学校像企业一样走向市场,参与竞争。高等教育在讲求社会效益的同时,开始关注经济效益。但高等教育办学成本存在着自身的特殊性,其投入大,成本高,生均成本不断上升。特别是地方院校经过几年的扩招,原有教学设备设施及师资超负荷运行,办学经费十分紧张,一部分高校不得不从银行贷款来改善办学条件。如何完善地方院校教育成本分     

Extraction of Partial Discharge Acoustic Signal by Wavelet Transform with Teager＇s Energy Operator

To develop a measurement system for monitoring partial discharge （PD） without the effect of external interferences,an algorithm of PD signal extraction based on wavelet transform with Teager＇s energy operators was presented. Acoustic signal generated by PD was selected to remove excessive interfering signals and electromagnetic interferences. Acoustic signals were collected and decomposed into I0 levels by wavelet transform into approximation and detail components. “Daubechies 25” was proved to be the most suitable mother wavelet for the extraction of PD acoustic signals. Compared with conventional wavelet denoising method, Teager＇s energy operators were adopted to the PD signal reconstruction and the signal to noise ratio was in creased by 20%-25% inthe experiment,without lost in energy and pulse amplitude.