一种嵌入式多工位压力机送料机构控制系统

本文设计了一种嵌入式多工位压力机送料机构控制系统。基于总线式和模块化设计方法,分别建立了基于ARM的主控制器、手控盒以及基于FPGA的运动控制器等子单元。该系统具有易于维护、扩展性好、抗干扰能力强、结构祭凑等优点。     

从文献计量学到网络计量学嬗变的可视化分析

文献计量研究从产生到现在已经经历了90余年的历史,形成了一门成熟的学科—文献计量学。随着定量研究的深入和社会环境的影响,信息计量学在文献计量学的基础上发展而来;而随着网络信息资源的激增,网络计量学应运而生。本文以ISI Web of Knowledge数据库中收录的以文献计量学、信息计量学以及网络计量学为主题的数据为样本,利用动态网络分析的信息可视化技术和工具—CiteSpaceⅡ,绘制出文献计量学、信息计量学以及网络计量学共被引知识图谱,揭示出它们的主要研究成果与代表人物。同时绘制出文献计量学研究的前沿演进知识图谱,直观地展示出从文献计量学向网络计量学演进嬗变的发展历程。     

教育综合改革背景下高校学院办公室管理工作探讨

加强教育综合改革,加快推进一流大学建设,深化“放管服”改革,职权下移,权责分明,提升二级学院的活力和动力,激发二级学院管理人员的创造力,成为高校学院改革的重点内容。二级学院办公室作为学院的综合办事机构,是高校改革的着力点和突破口。文章通过分析办公室职能定位和现存问题,准确判断现存的显性矛盾,探讨提升办公室综合管理效能、服务质量和水平的措施。     

乙酰丙酮邻氨基苯甲酸金属配合物中性载体水杨酸根离子电极的研究

以乙酰丙酮邻氨基苯甲酸合镍(Ⅱ)〔Ni(II)-L〕金属配合物为中性载体的水杨酸根离子选择性电极,对水杨酸根(Sal-)具有优良的电位响应性能和选择性,并呈现反Hofmeister选择性行为,其选择性为:Sal->ClO4->SCN->I->NO3->NO2->Br->Cl->SO42-.线性响应范围为:8.5×10-6~1.0×10-1mol/L,斜率为-54.1mV/decade,检测下限为4.25×10-6mol/L.采用紫外可见光谱技术研究了电极的响应机理,结果表明载体本身的结构与电极的响应性能间有非常密切的关系.电极用于药品分析,其结果令人满意     

强夯法在块石回填土中的应用与效果

强夯法具有设备简单、施工方便、适用范围广、经济易行、有效缩短工期及加固效果显著等优点.通过某厂区采用强夯法处理回填土地基的工程实例,介绍了该方法在以块石为主要填料地基中的处理效果.     

Complex pathologies of angiotensin II-induced abdominal aortic aneurysms

Angiotensin II (AngII) is the primary bioactive peptide of the renin angiotensin system that plays a critical role in many cardiovascular diseases. Subcutaneous infusion of AngII into mice induces the development of abdominal aortic aneurysms (AAAs). Like human AAAs, AngII-induced AAA tissues exhibit progressive changes and considerable heterogeneity. This complex pathology provides an impediment to the quantification of aneurysmal tissue composition by biochemical and immunostaining techniques. Therefore, while the mouse model of AngII-induced AAAs provides a salutary approach to studying the mechanisms of the evolution of AAAs in humans, meaningful interpretation of mechanisms requires consideration of the heterogeneous nature of the diseased tissue.     

苏联的“边缘化”与第二次世界大战的爆发

苏联的出现引起民了西方资本主义大国的不安，基于意识形态和一战后世界和平的考虑，苏联排斥在巴黎和会之外，这种安排上使苏联处于欧洲的边缘。“边缘化”政策导致欧洲均势的破坏，在某种程度上，促成了二战的爆发。     

Availability and toxicity of Fe(II) and Fe(III) in Caco-2 cells

The objective of the present study was to compare the toxicity and availability of Fe(II) and Fe(III) to Caco-2 cells. Cellular damage was studied by measuring cell proliferation and lactate dehydrogenase (LDH) release. The activities of two major antioxidative enzymes [superoxide dismutase (SOD) and glutathione peroxidase (GPx)] and differentiation marker (alkaline phosphatase) were determined after the cells were exposed to different levels of iron salts. The cellular iron concentration was investigated to evaluate iron bioavailability. The results show that iron uptake of the cells treated with Fe(II) is significantly higher than that of the cells treated with Fe(III) (P<0.05). Fe(II) at a concentration >1.5 mmol/L was found to be more effective in reducing cellular viability than Fe(III). LDH release investigation suggests that Fe(II) can reduce stability of the cell membrane. The activities of SOD and GPx of the cells treated with Fe(II) were higher than those of the cells treated with Fe(III), although both of them increased with raising iron supply levels. The results indicate that both Fe(II) and Fe(III) could reduce the cellular antioxidase gene expression at high levels. Project supported by the International Cooperative Project from the Ministry of Science and Technology of China (No. 2006DFA31030), the Bureau of Science and Technology of Zhejiang Province (No. 2006C32019) and HarvestPlus-China (No. 8022), and the Program for Changjiang Scholars and Innovative Research Team in University of China (No. IRT0536)     

基于ELM327的车载故障诊断系统开发

随着第二代在线故障诊断（OBD II）标准在不同品牌汽车上的强制应用,针对普通用户如何很好地了解汽车运行状态和故障诊断的需求,系统开发采用ELM327芯片通过OBDⅡ读取汽车ECU的数据,在PC、PDA或Mobile上显示汽车运行状态和进行故障诊断,省去繁杂的通讯协议,为广大普通用户提供一种简单易用的通用汽车故障诊断系统。