论光与眼睛及色彩的关系

“花开红树乱莺啼．草上平湖白鹭飞。”试想．如果没有太阳，你会感知到花开鸟飞的美景吗？也不会有什么蓝天、白云、青山、绿水、红色的苹果、黄色的柑橘、金首饰、银餐具、宽阔的马路、高大的楼房、美丽的脸蛋、华丽的时装等等。如果是在一片漆黑的夜晚里，再好看的一切，也都会失去它的魅力。     

Yangxueqingnao particles inhibit rat vascular smooth muscle cell proliferation induced by lysophosphatidic acid

Objective: To observe the effect of Yangxueqingnao particles on rat vascular smooth muscle cell (VSMC) proliferation induced by lysophosphatidic acid (LPA). Methods: The amount of3H-TdR (3H-thymidine) admixed in cultured rat VSMC was measured and mitogen-activated protein kinase (MAPK) activity and lipid peroxidation end product malondialdehyde (MDA)content of the VSMC were assayed. Results: 1×10-9, 1×10-8, 1×10-7 mol/L LPA in a concentration dependent manner, induced the amount of 3H-TdR admixed, MAP kinase activity, and MDA content of the cultured rat VSMC to increase. However, 5%, 10%,and 15% Yangxueqingnao serum preincubation resulted in a decrease of 23.0%, 42.0%, and 52.0% (P＜0.01) respectively in the amount of 3H-TdR admixed, a decline in VSMC MAP kinase activity of 13.9% (P＜0.05), 29.6% (P＜0.01), and 48.9% (P＜0.01)respectively, and also, a decrease in MDA content of VSMC of 19.4%, 24.7%, and 43.2% (P＜0.01) respectively, in the 1×10-7mol/L LPA-treated VSMC. Conclusions: LPA activates the proliferation and lipid peroxidation of VSMC in a concentration dependent manner. The LPA-induced VSMC proliferation is related to the activity of MAP kinases, enzymes involved in an intracellular signalling pathway. The results of the present study showed that Yangxueqingnao particles can effectively inhibit LPA-induced VSMC proliferation, MAP kinase activation, and reduce lipid peroxidative lesion.     

白细胞介素18及其生物活性

白细胞介素18(IL-18)是新近发现的一种细胞因子，能诱导TH1细胞等产生IFN-r，GM-CSF等细胞因子及Fas配体，具有增强THI细胞和NK细胞的细胞毒作用等免疫调节功能，在抗病原微生物感染、抗肿瘤及抗超敏反映等方面具有潜在的应用前景，同时，它也是内毒素诱导的小鼠肝坏死性休克的关键因子。     

基于CAN总线的变电站测控系统的设计方案

变电站的信息和数据共享及采用可靠、实用、高效的通信网络和协议，可以优化变电站自动化系统的功能，提高变电站系统的自动化水平；以CAN现场总线为基础，研究其在变电站综合自动化系统中的应用原理和实施方法，针对传统测控网络存在的缺陷，设计了一种由CAN总线组成的新型测控网络，采用双口RAM解决了CPU间数据的可靠传输问题，使得整个变电站系统内部设备之间实现可靠、快速的通信成为可能，从而为最终实现变电站无人值守提供了条件。     

Peer-Collaborator Preferences of African American and White Sixth-Graders in Mathematics Classrooms

Abstract

This study focused on academic and social correlates of collaborator preferences of African American and White sixth-graders in mathematics classrooms in fall and spring. Students’ appraisals of emotional risk were examined as a moderator. Nomination procedures identified collaborator preferences, group affiliations, and social centrality; students self-reported engagement and emotional risk; school records provided achievement scores. Results indicated students preferred group affiliates, but not exclusively, as collaborators. Students with greater centrality, achievement, and engagement received more nominations. In the fall, high achievers received more nominations when appraisals of risk were high; whereas, engaged students whose appraisals of risk were low received more nominations. Results are interpreted in relation to coordinating social and academic factors in peer collaboration.     

A Second Order Training Algorithm for Multilayer Feedforward Neural Networks

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安全的校园网访问控制体系的建立

校园网在运行过程中面临各种安全威胁,通过对校园网及其应用系统的访问控制体系问题进行分析,就身份认证、防火墙、文件和服务的共享访问和封锁系统漏洞四个方面提出基于访问控制的安全策略。     

PEMFC分散发电系统的压力控制研究

NomenclatureA-area ( m2)Dw-membrane water diffusivity ( m2/s)F-=96 487I-current (A)M-molecule mass (kg/mol)T-temperature (K)W-mass flowrate (kg/s)cw-water concentration in membrane ( mol/m3)m-mass (kg)n-cell numbernd-electro-osmotic drag coefficientp-pres…     

"网络文学":命名的草率与内涵的无区别性

“网络文学”是近年来出现的颇热门的概念,但究竟什么是网络文学,没有出现有说服力的看法。网络主要是从技术层面改变了文学的书写和传播方式,并没有从根本上改变了文学什么。所谓“网络文学”,充其量不过是一些网络写手和理论家们一厢情愿构筑的让他们能进能出的理想“小菜园”。     

沿海地区计算机制造产业集群跨区域网络构建研究

经过近20年的发展,沿海地区几大产业集群都具备了相当大的规模。但由于受经济区划及行政区划的限制,各大产业集群之间虽然在地理位置上成带状相连,却缺少足够的协同合作与互动,由此导致了各产业集群间产品结构雷同、恶性竞争愈演愈烈的局面。产业集群跨区域网络的构建,特别是跨区域交易网络和创新网络的建设,则可以有效地解决上述问题,有利于提高我国计算机制造产业协同竞争的能力,实现从产业链低端向高端的升级。