非计算机专业“C程序设计”课的教学体会

为搞好C程序设计课的教学工作,促进交流、学习,从案例教学、程序设计、加强实验、其他环节4 个方面介绍自己讲解C程序设计课的教学体会。     

Two virus-encoded RNA silencing suppressors, P14 of Beet necrotic yellow vein virus and S6 of Rice black streak dwarf virus

Functional analysis for gene silencing suppressor of P14 gene of Beet necrotic yellow vein virus and S6 gene of Rice black streak dwarf virus was carried out by agro- infiltration with recombinant vectors of Potato virus X. The phenotype observation of green fluorescent protein (GFP)expression and Northern blot showed that the gene silencing of gfp transgenic Nicotiana benthamiana induced by homologous sequence was strongly suppressed by the immixture infiltration of either the P14 or the $6. In the suppressed plants, the gfp mRNA accumulation was higher than that in the non-suppressed controls and the symptoms caused by PVX infection became more severe, especially the gfp DNA methylation of plant genome was significantly inhabited when co-infiltrated with RBSDV S6 gene. These results suggested that these two virus genes were potentially to encode for proteins as RNA silencing suppressors.     

大开口对船舶板架稳定性和极限承载力的影响

选取典型船舶板架，采用ANSYS系统，对开口和不开口的板，分别进行了特征值屈曲分析和极限承压屈曲分析，同时，运用便于简化处理的相当梁系法，将加筋板架，近似看作由带附连翼板的交叉梁系构成，转换以后，给出了一套工程近似计算方法，经分析比较，得知：板的屈曲模式所对应的屈曲压力并不一定是最低的，高应力区出现了梁（桁）腹板平面外的失稳，大开口边缘构件的倾向刚度大大削弱，纵桁的理论论界应力降低。     

Temporal-spatial characteristics of vegetation cover and desertification of China by using remote sensing data

Based on the NOAA advanced very high resolution radiometer (NOAA-AVHRR) remote sensing data of 1982 — 1999. the normalized difference vegetation index (NDVI) reflecting the surface vegetation cover has been obtained. Using the empirical orthogonal function analysis, the temporal-spatial eigenvectors of NDVI are given, and the characteristics of the spatial distribution of vegetation cover and its temporal variation together with the desertification of China are analyzed. It is found that the surface vegetation cover has seriously deteriorated in most part of China since 1995. along with the intensified desertification. All these are mainly caused by human activities although the climate change is responsible for the damage of surface vegetation cover to some extent.     

Preliminary study on land surface characteristics over Huaihe River Basin

The analysis of the flux observation dada from the Huaihe River Basin Experiment (HUBEX) shows that, in semi-humid monsoon regions, latent heat flux is as important as sensible heat flux in most situations. Moreover, it can even dominate the sensible heat flux in cropland and paddy field. This is distinct from that for arid and semi-arid regions where the sensible heat flux is dominant. Under clear sky conditions, the soil temperatures in different vertical layers all exhibit certain diurnal variations, and the magnitude decreases with depth to less than 1°C at a depth of 60 cm. This depth is considered as the transition layer for the soil moisture variation. On the other hand, the vertical profile of soil water content varies with the soil texture and even weather conditions, and the layer with maximum soil water content can also be found in Jiangji station during June 1998.     

一种求解带有机匣处理装置叶栅流场的数值方法

提出了一种数值计算带中有各结构机匣处理装置叶栅流场方法，采用圆柱坐标系下无粘定带方程组，以及参数周向平均概念，推导出新的控制方程，在子午面上有限元法进行了数值计算，选择３种典型结构的实壁机匣，周向槽处理机匣，轴向缝处理机匣为算例，并与稳态实验量结果作定量对比，发现符合较好，为分析机匣处理的扩稳机理提供了理论基础，也为工程设计机匣处理装置提供了新的数据计算工具。     

VB.Net 2003中串行端口通信的实现

针对MSComm控件的不足,探讨在VB.Net2003中如何利用API函数来定义串行端口类,并通过一个应用实例介绍如何利用该类的声明来实现PC与可编程控制器之间的串行通信.这对开发高质量的串行通信有一定的应用和借鉴价值.     

多媒体课件应用于化学实验教学的探索

1多媒体技术在教学改革中的作用几个世纪以来,各国教育家都在不断地致力于教学改革,从17世纪欧洲开始的KK班级授课方式到20世纪初的分组教学,道尔顿制、弹性制、文纳特卡制等改革实践,都力图改进传统的教学方式,寻求一种既能提高教学效率,又能培养独立学习能力和个性才能的途径。多媒体技术的蓬勃发展,为实现这一目标提供了可能[1]。     

双模压缩光场作用下电子干涉器件中电子密度的关联

通过对双模压缩态光场和两个电子干涉器件相互作用的研究，得到了两个电子干涉器件中电子密度的关联，并采用归一化关联函数来描述这种关联，发现通过选择合适的初始相位差，量子关联可以很好地从双模压缩态光场转移到电子。