中国高等教育的对外开放与发展——加入WTO以来的回顾与思考

加入WTO,高等教育成为一项服务贸易对我国而言机遇与挑战并存。我国在积极适应国际规则的同时,高等教育服务贸易在探索中获得了长足的发展。通过对我国高等教育服务贸易政策调适与发展状况的分析,可以发现我国高等教育服务贸易的发展特征及其中潜存的问题。     

论党员主体地位思想的历史方位与理论依据

党员主体地位思想是马克思主义政党的重要建党原则。新时期加强党员主体地位思想研究具有理论与现实意义。党员主体地位思想是在世情、国情以及党情发生重大变化而以改革创新精神推进党的自身建设的大背景下提出和形成的。马克思主义经典作家提出了民主原则、平等原则及少数服从多数原则等,为确立党员主体地位提供了原则性保障;党代表大会制度、选举制度、罢免制度和监督制度等,为确立党员主体地位提供了制度性保障;党员权利与义务的关系,尤其是保障党员权利的思想,为确立党员主体地位奠定了重要思想基础。     

农田水势软测量网络中的FWP软测量站

依据农田水势(FWP)软测量网络对FWP软测量站的功能要求,以S3C2440处理器为核心构建了FWP软测量站的硬件平台,通过移植嵌入式Linux操作系统内核搭建了软件平台;基于无线数据传输模块NRF2401,配置了无线通信接口,并编写了符合无线通信协议的数据传输驱动程序,实现了FWP软测量站中高速处理器S3C2440与现场采集节点中单片机ATmega128L之间的点对点无线数据传输.实验结果表明,FWP软测量站能可靠接收微环境信息采集节点数据并实现农田水势值的实时估计.     

Viral infection of tobacco plants improves performance of Bemisia tabaci but more so for an invasive than for an indigenous biotype of the whitefly

The ecological effects of plant-virus-vector interactions on invasion of alien plant viral vectors have been rarely investigated. We examined the transmission of Tomato yellow leaf curl China virus (TYLCCNV) by the invasive Q biotype and the indigenous ZHJ2 biotype of the whitefly Bemisia tabaci, a plant viral vector, as well as the influence of TYLCCNV-infection of plants on the performance of the two whitefly biotypes. Both whitefly biotypes were able to acquire viruses from infected plants and retained t...     

Effect of the geometric shapes of specimens on impact tensile tests

The geometric shapes of specimens are important in impact tensile tests because geometric shapes determine the stress states of the specimens, and precise geometric shapes can obtain proper material properties without non-material factors. The aim of this study was to investigate the 1D form of the stress by changing the length-to-diameter （L/D） ratios of specimens. The experiments were carried out on a split Hopkinson tensile bar （SHTB）-rotating disk indirect bar-bar tensile impact apparatus. The L/D ratios of the LY12CZ specimens used in the test ranged from 1 to 5. Results show that the specimens can be used to obtain exact parameters of materials under the proposed conditions when the L/D ratio is greater than 2. This is because the longer length will reduce or eliminate the effects of the interfaces.     

教育现代化进程中公共教育政策运行原则分析

由于教育在现代社会生活、国际竞争中的重要性越来越突出,而教育的复杂性和深刻性的程度又越来越高,政府能不能有效地规划教育的发展、指导教育的改革,取决于公共教育政策对教育发展方向和目标的准确把握,更取决于其运行原则的把握。     

当代大学生违法犯罪的现状及成因分析

随着大学生违法犯罪数量的不断增长,严重程度的加深,大学生违法犯罪成为了备受关注的热点问题,文章通过对大学生违法犯罪现状的分析,以把握其犯罪的特点,探究其犯罪的根源,并更多地从高校教育的角度提出预防对策,以减少大学生违法犯罪现象。     

Effect of high glucose levels on the calcification of vascular smooth muscle cells by inducing osteoblastic differentiation and intracellular calcium deposition via BMP-2/Cbfα-1 pathway

In this paper,we investigate the effect and the possible mechanism of high glucose levels on the calcification of human aortic smooth muscle cells (HASMCs).HASMCs were divided into four groups: normal glucose group (NG),osmolality control group (OC),high glucose group (HG,HASMCs culture medium containing 30 mmol/L glucose),and high glucose plus recombinant human Noggin protein (bone morphogenetic protein-2 (BMP-2) antagonist) group (HN).The mRNA levels and the protein expressions of BMP-2 and core binding factor alpha-1 (Cbfα-1) were measured by real-time quantitative polymerase chain reaction (PCR) and Western blot.After induced by 10 mmol/L β-glycerol phosphoric acid,cells were harvested for assessments of alkaline phosphatase (ALP) activities at Days 1,2,and 3,and intracellular calcium contents at Days 7 and 14,respectively.High glucose levels increased the mRNA levels and the protein expressions of BMP-2 and Cbfα-1 (P0.05).The expression of Cbfα-1 was partially blocked by Noggin protein (P0.05),while BMP-2 was not (P0.05).After being induced by β-glycerol phosphoric acid,high glucose levels increased the ALP activity [(48.63±1.03) vs.(41.42±2.28) U/mg protein,Day 3;P0.05] and the intracellular calcium content [(2.76±0.09) vs.(1.75±0.07) μmol/mg protein,Day 14;P0.05] in a time-dependent manner when compared with the NG group,while the ALP activity could not be blocked by Noggin protein [(48.63±1.03) vs.(47.37±0.97) U/mg protein,Day 3;P0.05].These results show that high glucose levels can evoke the calcification of HASMCs by inducing osteoblastic trans-differentiation and intracellular calcium deposition via the BMP-2/Cbfα-1 pathway,which can be partially blocked by Noggin protein.     

西江黄金水道滨水休闲产业发展研究

随着西江黄金水道的综合开发利用,西江流域成为我国华南地区的重要经济带.滨水休闲是西江经济带开发利用的新亮点.简介了西江水体功能的利用,在明确西江发展滨水休闲面临多重机遇的前提下,讨论了发展西江滨水休闲产业的构想.     

关于忽略匀强电场边缘效应的几个错题分析

匀强电场是中学物理中常见的一种理想模型,最典型的就是平行板电容器的两极板间的电场,在一般情况下,我们可以忽略其边缘效应,认为两板外没有电场,但在涉及带电粒子出电场后又重新回到电场,并且与出电场时不在同一等势面上时,忽略边缘效应会带来概念上的混乱,甚至又会出现"永动机"问题。