基于PIC16F873单片机的水产养殖增氧机设计

文中给增氧机设计了一种自动控制方案,这个方案的硬件电路采用了美国MICROSHIP公司生产的PIC16F873单片机.使得该系统具有智能增氧,水温报警的功能,可以有效的提高水产养殖的自动化程度和提高水产养殖的饲料利用率.     

Biological, psychological and environmental predictors of the alcoholism risk: a longitudinal study

Interference reflection microscopy (IRM) was used to evaluate the status of cell matrix adhesions in the MCF-7 human mammary carcinoma cell line. Focal contacts were concentrated at the periphery of individual cells or small cell clusters. Close contact was detected as a band at cell peripheries and as localized patches throughout the ventral face of cells. The MCF-7 cells also exhibited a distinctive reflection pattern of an intensity midway between that of either focal or close contact. This novel reflection pattern was located primarily at the periphery of cells and often obscured visualization of focal contacts in live cells. A similar distinctive pattern was absent from the normal tissue-derived MCF-10A mammary epithelial cell line. Immunofluorescence staining using an antiserum that cross-reacts with both alpha(v)beta3 and alpha(v)beta5 integrins revealed a distribution of the vitronectin receptor similar to that of the novel adhesion pattern as well as to that of focal contacts. In addition, IRM demonstrated the presence of "tracks" associated with cells, which were also stained with the vitronectin receptor antiserum. The tracks are apparently residual material left behind as a result of cell migration. When MCF-7 cells were cultured in the absence of estradiol, the tracks were greatly diminished when visualized with either IRM or staining for the vitronectin receptor. In contrast, the addition of 17-beta-estradiol to the medium resulted in an increased presence of the tracks as well as the development of extensive close contacts throughout the ventral surface of cells and cell clusters. Cells treated with the estrogen antagonist ICI 182,720 in the presence of estradiol had few associated tracks, indicating that the process leading to the formation of these structures is dependent on an estrogen receptor-activated pathway. However, the antagonist did not prevent the estradiol-induced formation of extensive close contacts. The extensive close contact as well as the increase in trailing material suggests that estradiol may promote breast tumor cell motility. However, this migratory activity may be mediated by both estrogen receptor-dependent and -independent pathways.     

基于UML的学生顶岗实习管理系统分析与设计

顶岗实习是高职院校重要的实践教学环节,要实现对顶岗实习的有效管理,需要借助网络技术搭建管理平台,实现对参与实习师生的管理与指导。该文在对顶岗实习流程及实习任务分析基础上,运用UML建模方法对系统进行分析建模与设计建模,并提出了系统框架与解决方案。     

入侵检测系统发展简述

入侵检测系统是目前信息安全系统中的一个重要组成部分,该文简述了其二十多年的主要发展历程,对其使用的技术以及未来的发展方向进行了简要介绍。     

洪水预报与数值模拟技术在城市防洪中的应用——以浑河沈阳城市段为例

对城市防洪、非工程措施、洪水预报与数值模拟技术的重要性进行阐述,结合浑河沈阳城市段分别从预报方案和预报系统技术对系统的功能结构进行归纳总结。同时,介绍了数值模拟技术在城市防洪中的应用情况,提出具有继承性和发展性自动化系统解决方案。应用该系统妥善解决了浑河防洪减灾中原有存在的疑难问题,为浑河防洪减灾工作提供全面支持。     

基于图像处理的水位自动测量技术

采用ARM处理器与视频服务器相结合的方法,设计了一种实时水文监测系统,实现了在下位机中提取特征量,继而通过GPRS与上位机进行通讯。该系统利用Wince编程,对采集的图像进行二值化,再利用形态学算法去除非特征量,然后进行边缘细化,利用霍夫变换提取出水位线与河岸线的直线方程进行计算,依据像素间隔与坐标系数的换算关系,求得图像中两者之间的距离,最后利用像素间隔与实际物理坐标换算关系得到物理距离。实验结果表明,该系统具有抗噪、稳定、可靠和实时性强等特点,取得了很好的识别效果。     

Diazepam-ketamine anaesthesia for open heart surgery a "micro-mini" drip administration technique

Two hundred open-heart cases were anaesthetized with a diazepam-ketamine combination. The results were excellent. A "Micro-Mini" drip technique insured low, even, but adequate dose levels of ketamine and less drug was used. Induction and maintenance are simple and smooth. Effects on the cardiovascular system and respiratory system are minimal. The margin of safety is wide and 100% oxygen can be used whenever needed.     

Effect of nitrocarburizing on sulphide layer during nitrocarburizing-sulphurating treatment

Compared with the single sulphurating treatment, the duplex treatment of nitrocarburizing-sulphurating can more effectively improve the properties of steel such as friction-reducing, wear resistance and anti-scuffing. Under the same processing parameters, the sulphide layers were fabricated on the surface of CrMoCu alloy cast iron by single ion-sulphurating treatment and nitrocarburizing-sulphurating duplex treatment, respectively. Through the analysis of the sulphide, the effect of the nitrocarburizing on the fabrication of the sulphide layer was investigated. And the result shows that the fabrication of sulphide layer is promoted by the nitrocarburizing treatment.