企业研发团队知识共享影响因素的实证研究

基于知识共享理论和研发团队知识共享特征和影响因素,提出企业研发团队知识共享影响因素概念模型及理论假设,并运用调查问卷和结构方程模型对研发团队知识共享影响因素进行实证研究.结果表明,知识提供者、接受者、共享手段和共享双方关系4因素对研发团队知识共享水平有显著影响,而知识共享文化对知识共享水平影响作用不显著.提出了提高企业研发团队知识共享水平的对策与建议.     

基于Simulink的动态电路分析

介绍了Simulink应用于动态电路仿真分析的方法,以一个实例详述了图形输入式建模、参数设置、仿真配置、Matlab绘图分析等步骤．指出了联合运用To File、To Workspace和Scope模块,实现不同参数情况下仿真分析的优越性．     

数学分析在高等代数中的某些应用

高等代数中的某些问题,若用代数学的方法解决起来可能相当繁琐,但若结合数学分析的方法,则问题往往会迎刃而解．该文使用数学分析中的函数连续性和无穷区间的广义积分知识解决某些矩阵问题和二次型问题．     

MATLAB应用于离散时间系统分析的教学探讨

在离散时间系统分析的课堂教学中，借助科学计算软件MATLAB能在阐述概念的同时。避免过多的手动运算，即时给出相关结果和函数图形，使得在有限的时间内展现整个系统分析的流程，节省了时间，改善了授课效果．     

Naturally secreted oligomers of amyloid beta protein potently inhibit hippocampal long-term potentiation in vivo

Although extensive data support a central pathogenic role for amyloid beta protein (Abeta) in Alzheimer's disease, the amyloid hypothesis remains controversial, in part because a specific neurotoxic species of Abeta and the nature of its effects on synaptic function have not been defined in vivo. Here we report that natural oligomers of human Abeta are formed soon after generation of the peptide within specific intracellular vesicles and are subsequently secreted from the cell. Cerebral microinjection of cell medium containing these oligomers and abundant Abeta monomers but no amyloid fibrils markedly inhibited hippocampal long-term potentiation (LTP) in rats in vivo. Immunodepletion from the medium of all Abeta species completely abrogated this effect. Pretreatment of the medium with insulin-degrading enzyme, which degrades Abeta monomers but not oligomers, did not prevent the inhibition of LTP. Therefore, Abeta oligomers, in the absence of monomers and amyloid fibrils, disrupted synaptic plasticity in vivo at concentrations found in human brain and cerebrospinal fluid. Finally, treatment of cells with gamma-secretase inhibitors prevented oligomer formation at doses that allowed appreciable monomer production, and such medium no longer disrupted LTP, indicating that synaptotoxic Abeta oligomers can be targeted therapeutically.     

基于生态足迹法的黑龙江省林场所生态安全研究

为做好林场所生态安全评估,对林场所的经营管理做出积极调整,使林场所生态系统能够发挥更大的碳汇作用,成为我国实现碳中和、碳达峰目标进程中重要的“碳汇”平台,通过以黑龙江省伊春市青山林场所为例,在生态足迹法基础上,建立林场所生态承载力和生态足迹计算模型,定量分析2018年林场及经营所的整体生态安全和资源开发情况。结果表明：2018年,青山林场所生态安全处于可持续发展和生态协调阶段;生态空间总体呈现盈余状态,其中林地生态空间盈余为855.20 hm2,约占林地生态承载力的31.4%。可见林场所生态仍在区域中发挥着巨大的经济效益、生态效益和社会效益。