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Search Results: 1 - 10 of 121361 matches for " 吴光毅 "
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直通式封严篦齿内部流动和换热的实验研究
黄晓,
推进技术 , 1999,
Abstract: 为了研究外界因素对高推动比航空发动机中密封装置性能的影响,介绍了在吸气式内流传热风洞实验台测量了不同雷诺数和不同齿顶厚和齿隙比的工况下对篦齿腔内部流动的影响规律,并利用该实验台对篦齿顶板表面的换热特性进行了研究.测量结果说明了在篦齿腔中旋涡的分布及雷诺数变化对旋涡分布的影响.并得出了在不同雷诺数和t/c工况下对篦齿顶板表面换热特性的影响
试论农地流转背景下乡村治理的优化
On Optimization of Rural Governance Under Background of Rural Land Transfer

,胡尊让
- , 2016,
Abstract: 改革开放以来,农村家庭联产承包责任制的确立促成了农村“乡政村治”的治理格局。然而近年来,随着农地流转在广大农村地区兴起并产生新的利益主体,“乡政村治”治理格局呈现出参与主体扩大化和利益诉求多元化的趋势。新兴利益主体与原有“乡政村治”治理格局下的参与者既存在利益关联,又有利益冲突,原有的“乡政村治”治理格局需要与时俱进进行调整。分析农地流转背景下相关利益主体各自的角色期望和行为方式,基于农地流转的利益关系,将各利益主体置于共同参与的乡村治理框架下,并探索治理的优化,是今后广大农村地区深化改革发展的重要议题。
Since the reform and opening up, the rural household contract responsibility system has led to the establishment of rural “township politics and village autonomy” governance pattern. However in recent years, with the circulation of farmland in rural area and the rise of new subjects of interests, the “township politics and village governance” governance pattern is facing a trend of participants expansion and interests diversification. Emerging stakeholders and the participants of the original “township politics and village governance”governance pattern are associated with the interests, and also have a conflict of interests, and the original “township politics and village governance” governance structure needs to keep pace with the times to adjust. Upon analyzing the respective role expectation and motivation of relevant stakeholders under the background of rural land circulation, it is found an important issue to explore management optimization in the vast rural areas to deepen the reform development with the participation of various stakeholders in agricultural land transfer and rural governance framework.
基于模糊模式识别的分布式电压控制实时分区算法
冀湘,,
电力系统自动化 , 2006,
Abstract: 提出了一种适用于电力系统紧急状况的分布式电压控制分区算法。首先建立详细的适用于分区算法的无功电压模型;然后通过建立与电压控制相关的系统运行特征向量,得到了包含若干典型事故、异常以及正常情况运行方式的样本集,并计算出对应的电压分区方案;在紧急情况时,采用模糊模式识别的方法,实时识别电力系统的实际运行状态,确定电压控制分区方案。仿真结果表明该电压控制分区算法在紧急情况下取得较好的效果。
基于多数据源的电力变压器分层故障诊断系统设计
李静,,,冀湘
电力系统自动化 , 2004,
Abstract: 在现有变压器在线监测条件普遍不足的前提下,介绍了一种基于多数据源的变压器分层故障诊断系统。该系统充分利用在线监测数据和各种电气试验、运行状况以及专家经验等信息,将人工神经网络和基于事例(case)推理的专家系统结合起来,在不同层次的故障诊断模型中采用不同的智能诊断手段,逐步深入、细化诊断结果,并对系统的数据流和知识流进行合理的总体规划。该系统还提供了模拟变电站数据的仿真器,可用于系统的测试,在一定程度上保证了其可靠性。
变电站的计算机网络安全分析
高卓,,,
电力系统自动化 , 2002,
Abstract: 随着电力系统数据网络建设步伐的加快,变电站计算机网络安全问题日益突出。文中详细分析了变电站面临的网络安全威胁和网络安全需求,并结合变电站的计算机网络结构特点,提出了相应的系统安全策略和信息安全策略,重点介绍了几种应用于变电站的网络安全技术:信息加密技术、防火墙技术、多代理安全管理技术和虚拟专网(VPN)技术。
抗禾谷孢囊线虫基因中核苷酸结合位点区(nbs)-亮氨酸重复序列区(lrr)的克隆与序列分析
,翟旭,,,潘志芬,余懋群
应用与环境生物学报 , 2006,
Abstract: 摘要根据源于节节麦抗禾谷孢囊线虫基因cre3及已经克隆的nbs-lrr类植物抗病基因的nbs与lrr区保守序列分别设计特异引物,从易变山羊草基因组中pcr扩增得到两个扩增条带,它们的大小分别约为530bp和1200bp.经克隆测序发现,这两个序列分别长为532bp和1175bp,且是连续的.它们有32bp的共同序列,总长为1675bp,包含了一个nbs-lrr区和一个不完整的开放阅读框,没有起始密码子、终止密码子和内含子结构.它编码一个557个氨基酸的蛋白质,分子量(mr)为63.537×103,含有nbs区保守模体ildd,eskilvttrsk,kgsplaartvgg,rrcfaycs,egf,以及lrr区的保守模体axxlxxlxxl.它与cre3的核苷酸和氨基酸同源性分别为87.8%和77%,可能是一个抗禾谷孢囊线虫基因.图6参13
腹腔镜与显微镜下治疗青年精索静脉曲张疗效分析
Comparison of the Outcomes of Laparoscopic Varicocelectomy and Microscopic Varicocelectomy in Adolescence
 [PDF]

孙广海, 刘萃龙, , 赵豫波, 徐衍盛, 周茂军,, 王希友, 关维民
Hans Journal of Surgery (HJS) , 2015, DOI: 10.12677/HJS.2015.42003
Abstract:
目的:探讨腹腔镜与显微镜下治疗青年原发性精索静脉曲张的疗效、安全性。方法:回顾性分析71名青年原发性精索静脉曲张患者治疗后随访资料,其中有5例慢性前列腺炎患者。39例接受腹腔镜精索静脉高位结扎术(腹腔镜组),2例慢性前列腺炎患者;32例接受显微镜下精索静脉结扎组(显微镜组),3例慢性前列腺炎患者。比较两组患者术前、术后3月精液质量、激素水平、睾丸体积变化情况及手术时间、住院天数、费用。结果:两组患者手术均顺利完成,腹腔镜组与显微镜组相比手术时间明显缩短(85.94 ± 20.44 vs 39.00 ± 9.69, P < 0.05),住院费用明显增高(4866 ± 541.45 vs 7820 ± 906.21, P < 0.05),术后住院时间差异无统计学意义(P > 0.05)。两组患者术后精液质量较术前无差异(P > 0.05),精子密度、精子存活率、A + B级精子明显改善,差异有统计学意义(P < 0.05)。显微镜组与腹腔镜组术后精子密度、精子存活率、A + B级精子相比差异无统计学意义(P > 0.05)。腹腔镜组术后2例(5.1%)复发,1例(2.6%)附睾炎,2例(5.1%)症状持续存在,2例(5.1%)阴囊水肿;显微镜组术后无复发、附睾炎、阴囊水肿,但是有1例(3.1%)患者症状持续存在。结论:青年精索静脉曲张患者精液质量大多已受影响,早期手术可以恢复精液质量或减轻精液质量的下降。腹腔镜与显微镜下治疗精索静脉曲张均为微创手术,创伤小、疗效好,但是显微镜下治疗精索静脉曲张费用低、术后复发率低、并发症更少。
Objective: To compare curative effect between microscopic and laparoscopic approach for treatment of varicocele. Method: We retrospectively analyzed 71 adolescence varicocele patients after treatment follow-up data. 39 cases underwent laparoscopic high ligation of spermatic vein (laparoscopic group). 32 patients received ligation of varicocele group under the microscope (microscopy group). The semen quality, hormone levels and testicular volumes of these two groups of patients before and after the operation, operation time, hospitalization days and cost were compared. Results: All patients were successfully completed the operation. Laparoscopic group compared with microscope group operation time is obviously shortened (85.94 + 20.44VS39.00 + 9.69, P < 0.05). There was no statistically significant difference of postoperative hospital stay (P > 0.05), but the cost was significantly increased (4866 + 541.45VS7820 + 906.21, P < 0.05). Compared with preoperative semen quality, postoperative semen quality of these two groups of patients showed no statistical significance. Sperm density, sperm survival rate, A + B grade sperm significantly improved (P < 0.05). In the laparoscopic group after operation, 2 cases (5.1%) of recurrence, 1 case (2.6%) of patients with epididymitis; 2 cases (5.1%) clinical symptoms persisted and 2 cases (5.1%) occurred scrotal edema. However, no recurrence, epididymitis, scrotal edema in the microscope group after operation, but 1 case (3.1%) of patients with persistent symptoms. Conclusion: Most of the youth semen quality of patients with varicocele has affected; early operation can restore the semen quality or decrease the damage level of semen quality. Laparoscopic and microscope to treat varicocele were minimally invasive operation. They have the characteristics
利用Mimics软件构建人颅骨缺损区植入体的参数设置研究
范芦芳,徐浩铜,张正治,,,,李颖,张绍祥
第三军医大学学报 , 2011,
Abstract: 目的对Mimics软件内构建颅骨缺损区植入体模型的参数设置进行研究,以提高缺损区植入体设计的精确度。方法将30个行颅骨修补术的缺损头颅随机分为2组,利用CT扫描获得这些头颅的薄层图像并导入Mimics软件,在输入插值30,光滑因子0.8的参数(单纯光滑组)和输入相同参数并加入缩减补偿程序(光滑补偿组)后采用镜像技术构建两组缺损区的植入体模型。分析两组植入体表面积与其原始表面积之间是否有差异,并观测两组行颅骨修补术的平均手术时间和钛钉使用数量。结果Mimics软件内单纯光滑组的植入体表面积(3863.0±306.5)小于其原始表面积(4029.8±392.4)(P<0.01),而光滑补偿组的植入体表面积(4149.9±341.4)与其原始表面积(4157.1±335.8)基本一致。光滑补偿组的平均手术时间和钛钉使用数量比单纯光滑组明显减少(P<0.05)。结论在Mimics软件内设计颅骨缺损区植入体需注意将缩减补偿程序纳入重建参数,使得到的钛网更好地与缺损区相吻合。
Magnetic hysteresis and refrigeration capacity of Ni—Mn—Ga alloys near Martensitic transformation
傅斌,,段静芳,王超伦,常永勤,叶荣昌,
中国物理 B , 2010,
Abstract:
基于车车通信的换道超车辅助系统设计与实现
杨晓,黄罗,王吟松,志周
公路交通科技 , 2012,
Abstract: 针对现有换道超车辅助系统的不足,提出了基于车车通信的换道超车辅助系统.以嵌入式系统为核心,使用了IEEE802.11p无线通信技术.对系统的硬件架构和软件算法进行了描述,使用2台试验车于同济大学校园内对系统进行了实地测试,分析了换道超车过程中的时间和速、时间和转速之间变化的相互关系.试验得出在装载辅助系统情况下,2车的平均速度相对于正常情况下分别提高了17.32%和13.92%,速度标准差分别减少了5.34%和49.43%.2车转速分别提高了24.91%和12.31%,转速标准差分别减少了50.06%和48.62%.测试结果表明了该换道超车辅助系统在实地测试中可行,且能提高车辆的行驶速度.
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