PBL导向的大学生科研人才培养模式构建——以省级大学生创新性训练项目为例

随着高等教育改革的推进,大学生的创新精神和科研能力逐渐受到重视.作为一种教学模式,PBL导向的科研人才培养模式正在被逐步推广.本文从情境认知、合作学习与构建主义理论三个方面阐述了PBL导向型大学生科研人才培养模式的理论基础,并以省级大学生创新性训练项目为例,探讨了以PBL为导向的科研人才培养模式在实践当中的具体应用与培养路径,最后提出了完善PBL导向型大学生科研人才培养模式的对策建议.     

不同因素对认知诊断DINO模型诊断准确率的影响

本文探究不同因素对确定性输入噪声"或"门模型(DINO)判准率的影响。模拟实验表明:DINO模型更适用于离散型属性层级结构;测验长度的合理增加有助于提高诊断的准确率;DINO模型对属性层级结构不敏感;认知属性个数的增加会降低DINO模型的诊断准确率,实际应用中建议认知属性个数控制在6个以下。     

甲型 H1N1 流感 1126 例回顾性临床分析

为探讨甲型H1N1流感轻症病例与普通流感不同之处。采用回顾性分析2009年9月至2010年4月我校1126例甲型H1N1流感患者的临床资料。显示暴发时间与普通流感季节不同。早期血常规检查结果显示：92．4％病例嗜酸粒细胞百分率减低,83．0％病例淋巴细胞百分率减低,71．6％病例单核细胞百分率增高。临床表现及治疗方法与普通流感无明显区别。发现甲型H1N1流感患者早期血常规检查可显示与普通流感不同之异常改变。     

Effect of substrates and underlayer on CNT synthesis by plasma enhanced CVD

Due to their unique thermal, electronic and mechanical properties, carbon nanotubes （CNTs） have aroused various attentions of many researchers. Among all the techniques to fabricate CNTs, plasma enhanced chemical vapor deposition （PECVD） has been extensively developed as one growth technique to produce verticallyaligned car bon nanotubes （VACNTs）. Though CNTs show a trend to be integrated into nanoelectromechanical system （NEMS）, CNT growth still remains a mysterious technology. This paper attempts to reveal the effects of substrates and un derlayers to CNT synthesis. We tried five different substrates by substituting intrinsic Si with high resistivity ones and byincreasing the thickness of SiO2 insulativity layer. And also, we demonstrated an innovative way of adjusting CNT den sity by changing the thickness of Cu underlayer.     

Simultaneous optimization of multiple performance characteristics in WEDM for machining ZC63/SiCp MMC

Abstract The compliance of an integrated approach, principal component analysis （PCA）, coupled with Tagu chi＇s robust theory for simultaneous optimization of cor related multiple responses of wire electrical discharge machining （WEDM） process for machining SiCp rein forced ZC63 metal matrix composites （MMCs） is investi gated in this work. The WEDM is proven better for its efficiency to machine MMCs among others, while the particulate size and volume percentage of SiCp with the composite are the utmost important factors. These improve the mechanical properties enormously, however reduce the machining performance. Hence the WEDM experiments are conducted by varying the particulate size, volume fraction, pulseon time, pulseoff time and wire tension. In the view of quality cut, the most important performance indicators of WEDM as surface roughness （Ra）, metal removal rate （MRR）, wire wear ratio （WWR）, kerf （Kw） and white layer thickness （WLT） are measured as respon ses. PCA is used as multiresponse optimization technique to derive the composite principal component （CPC） which acts as the overall quality index in the process. Consequently, Taguchi＇s S/N ratio analysis is applied to optimize the CPC. The derived optimal process responses are confirmed by the experimental validation tests results. The analysis of vari ance is conducted to find the effects of choosing process variables on the overall quality of the machined component.The practical possibility of the derived optimal process conditions is also presented using SEM.     

《史记·魏公子列传》释文校正一则

关于《史记·魏公子列传》中,“遍赞宾客”一句的训释历来多有分歧,教材及文选注释常相龃龉.故有必要对这一问题详加考求,以释前疑.     

大学生学校疏离感现状调查

目的：初步调查当代大学生学校疏离感的现状。方法：采用自编的学校疏离感量表对280名大学生进行调查。结果：①男大学生的学校疏离感显著高于女大学生。（争来自城市的大学生的疏离感显著高于来自农村的大学生。③独生子女的学校疏离感高于非独生子女。（多重点大学学生的学校疏离感高于非重点大学的学生。⑤不同年级的大学生的学校疏离感存在差异,其中一年级学生的学校疏离感显著低于二年级和四年级的学生。针对学校疏离感现状提出相应的对策。