中枢神经递质对心血管活动的影响

多种中枢神经递质参与心血管活动调节.中枢神经递质有升高血压、中快心率和降低血压、减馒心率两种机制.本文讨论了几种中枢递质对心血管活动的影响.     

多路开关遥测遥控系统

提出一种通用于工业自动化中的多路开关遥测遥控系统，主要由多路开关采集发送单元和多路开关数据接收单元组成。每对收发单元可实现１５个开关量的测控，并可以方便地进行级联或并联以组成更多开关量的测控系统。系统全部由硬件构成，具有体积小、成本低、抗干扰、灵活方便、测控距离远、通用性强等优点。     

论智能分布式模拟屏实时监控系统(DIRMSS)设计

本文提出一种全新的DIRMSS系统结构,该系统既能独立自成系统又可联网,既能实时又能非实时运行,既能支持实时动态图形表格显示,又可离线利用ECAD生成图形画面,同时还具备通讯信道自诊断故障定位、显示设备故障定位和路径敏化等优点。     

中波单边带立体声广播的高效率发射

中波单边带立体声广播发射系统，除要求高质量传送信息外，由于其发射功率较大，因此，如何提高发射机效率也是至关重要的问题。单边带立体声广播系统在大功率发射方面不能套用普通调幅广播系统，本文根据“包络抑制重建法”原理，提出一种全数字化的高效大功率发射系统，以数字宽带移相器代替模拟电路移相器实现９０°相移，从理论上进行分析，并用计算机作了模拟试验，说明该方案是合理的。     

Neurobiological disruptions induced in brains of the rats fed with mercury contaminated rice collected from experimental fields in Guizhou Province, China

Guizhou Province, located in the southwestern China, is an important mercury （Hg） production center. High levels of Hg were found in local environmental and biomass samples. The neurobiological disruptions induced in brains of rats fed with Hg polluted rice collected from two experimental plots in Guizhou Province were studied. The plots are close to the Hg mine of Wanshang area and a chemical plant （where Hg is used as a catalyst for the production of acetaldehyde） of Qingzhen area. Rats were fed for 30 d before toxicological end points were tested. The results showed that the accumulations of Hg in rat＇s brain of Qingzhen chemical plant group and Wanshang mine group were significantly higher than those of Shanghai group （control group） （P〈0.01）. The neural transmitters, including acetylcholine （Ach）, acetylcholine enzyme （AchE）, nitric oxide and nitricoxide synthase （NOS）, in rat＇s brain were significantly affected. Oxidative stress was observed in the exposure groups. The expression levels of the immediately early gene （lEG）, c-fos and c-FOS proteins were induced by the Hg polluted rice. It was noted that the lEG （c-fos） participated in the neurotoxic process induced by the Hg polluted rice. lEG response to Hg might be dependent on interactions between neural transmitter and oxidative damage, c.fos could be used as an effective index of detecting and assessing the neurotoxicity of Hg. The results suggested that it should be alert to mental health problem in human beings eating Hg-polluted food. More efforts are necessary to protect the local ecosystem and human health in the Hg polluted areas such as Wangshan and Qingzhen in Guizhou Province of China.     

以钻杆为天线的钻井遥测系统的研究

分析了制约钻井遥测发展的技术原因,结合电磁理论和钻井设备本身的特点,提出在钻井遥测系统中以钻杆为天线的工程技术,然后从多方分析了该技术的可行性和实用性,并在试验中得以证实.     

遥测式液体比重计的设计原理

本文较为详尽地推导论证了遥测式液体比重计的设计原理和实施方案。实践证明设计方案合理,测试准确,稳定性好,可以直读与遥测兼容,随机检测,适用范围广。     

遥控遥测技术课程的教学研究

教学研究从教学的理论内容和课程实验内容两个方面阐述遥控遥测技术的教学主体内容,目的在于深入地加强该课程的教学研究,提高学生动手能力,拓宽学生的专业知识,以适应遥控遥测新技术的发展和应用。教学实践表明,其教学效果良好。     

利用电力线载波实现的温度遥测系统

介绍一种利用电力线载波实现的温度遥测系统,说明了该系统的设计思想及系统的软、硬件构成,给出了系统的原理框图     

油橄榄叶提取物联合美沙酮对海洛因成瘾大鼠的脑组织结构及单胺递质的影响

目的:观察油橄榄叶提取物(olive leaf extract,OLE)联合美沙酮对海洛因依赖大鼠的脑组织结构及单胺递质的影响。方法:将28只健康大鼠随机分成正常组、模型组、OLE+美沙酮处理组和美沙酮处理组。按递增法采用皮下注射海洛因建立海洛因依赖大鼠模型,造模后药物处理30 d,在光学显微镜下观察大脑额叶皮层细胞结构的变化,利用荧光分光光度法检测脑中单胺类递质的含量。结果:与正常组相比,模型组海洛因依赖大鼠出现大脑额叶皮层结构不清、神经元发育不良、皮层厚度减小、脑单胺类递质含量明显增高;与模型组相比,OLE+美沙酮处理组和美沙酮处理组的大鼠大脑额叶皮层结构清晰、皮层厚度增加、脑单胺递质含量显著降低。结论:OLE联合美沙酮明显改善了海洛因依赖大鼠的戒断症状,保护了脑组织,其作用机制可能与脑内单胺递质的改变有关。