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Search Results: 1 - 10 of 252103 matches for " 刘永洛 "
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传送网运行有效性评价模型
,
北京邮电大学学报 , 2006, DOI: 10.13190/jbupt.200604.14.051
Abstract: 定义了以实时网络运行质量为考察对象的运行有效性概念。通过分析运行时刻失效、全体电路集之间的关系,提出了基于电路业务、面向运行时刻,以及综合考虑影响评价因素的运行有效性评价指标——业务中断指数。从而使运行质量被量化为0~100之间的数字;同时离散时刻的指数在时间轴上延伸形成运行有效性曲线,该曲线直观地表达了网络的运行状况。
基于业务的传送网故障测度新方法
,尹培生,
电子学报 , 2007,
Abstract: 提出了一个基于业务的传送网四元组故障测度方法(O,A,P,R)。为测度故障对网络造成的实际损失和潜在影响程度,提出了两个量化评价指标:业务中断指数和业务影响指数。通过连接离散的评价值,得到两个时变的连续评价函数。对该两个函数在故障时间上积分,得到量化的测度结果。四元组分别从实际损失、潜在影响、过程变化、相关信息等四个方面对结果进行描述。以某实际网络的一部分为样例环境,对该方法和其它方法的测度结果进行了对比。结果显示无论在单故障还是多故障场景下,该方法的效果都优于作对比的方法。
三种换药方式在连续性肾脏替代治疗中股静脉置管处的应用
,张颖君,,代明金,小兰
华西医学 , 2014, DOI: 10.7507/1002-0179.20140159
Abstract: 目的 探讨无菌纱布、透明敷贴及无菌纱布联合透明敷贴换药在连续性肾脏替代治疗(CRRT)患者股静脉置管处的应用。方法 回顾性分析2011年10月-2012年10月连续行CRRT股静脉置管的229例患者,分别采用无菌纱布(A组,n=50)、透明敷贴(B组,n=77)及无菌纱布联合透明敷贴(C组,n=102)换药。比较出口部位感染、隧道感染及导管感染等指标。结果 A组患者无论是出口部位感染、隧道感染还是导管感染均高于C组患者,差异均存在统计学意义(P<0.05)。而B组与C组患者相比,仅出口部位感染差异有统计学意义(P<0.05),B组高于C组。A组与B组患者出口部位感染、隧道感染差异有统计学意义(P<0.05),A组均高于B组,导管感染两组差异无统计学意义(P>0.05)。结论 在股静脉置管处使用无菌纱布联合透明敷贴换药可以显著降低感染率,是一种值得推广应用的方法。
基于介电常数法的汽轮机油质量监测
唐金伟,李烨峰,,王娟,肖秀媛,常治军,严锁宁
热力发电 , 2015,
Abstract: 阐述了基于介电常数法的汽轮机油质量监测方法及原理,以某电厂32号l-tsa运行汽轮机油为例,通过试验研究了汽轮机油中的水分、金属磨粒浓度、老化时间及油液温度与油液介电常数之间的变化规律。结果表明,汽轮机油的介电常数随水分、金属磨粒浓度、老化时间的增加而增大;油液介电常数与油温呈线性关系;介电常数作为汽轮机油污染的评价指标是可行的。
微孔硅铝吸附剂用于矿物变压器油再生处理
唐金伟,李烨峰,,王娟,冯丽苹,肖秀媛,常治军
热力发电 , 2015,
Abstract: 分别采用制备的微孔硅铝吸附剂与传统的硅藻土和硅胶作为吸附剂,对退出运行的矿物变压器油进行再生处理试验。结果表明:微孔硅铝吸附剂能使再生变压器油颜色变浅,无油泥析出,其介质损耗因数、酸值、体积电阻率、界面张力等各项指标均达到设备投入运行前变压器油的质量标准,且优于传统的硅藻土和硅胶吸附剂处理结果,实现了退出运行的矿物变压器油的循环再利用。
Approach to blind estimation of PN sequence for DSSS signal based on blind identification and blind equalization
基于盲辨识和盲均衡的直扩信号伪码估计方法

WEI Yong-peng,LIU Luo-kun,ZHANG Jian,GUO Hong,
,,张 剑,郭 虹

计算机应用研究 , 2012,
Abstract: In order to solve the problem of blindly estimation of pseudo random PN sequence for direct sequence spread spectrum DSSS signal in multipath channel, on the basis of equivalent combined impulse response of the channel model, this paper proposed a blind estimation algorithm combined blind channel identification and data-reusing blind equalization. This method estimated the equivalent combined impulse response of the channel using blind identification, it estimated the PN sequence using data-reusing blind equalization. Theoretical analysis and simulation results prove that the proposed algorithm can realize accurate blind estimation of PN sequence in multipath channel and low SNR, and show extensive adaptability to a variety of PN sequence including m sequence, Gold sequence and M sequence.
一种基于组移动性的战术adhoc网络分群算法
郭虹,
计算机应用 , 2009,
Abstract: ?如何合理地保障分群是战术adhoc网络实现分层网络并进行分群路由的前提和核心环节。针对这个核心问题,引入组移动特征,结合本地移动性参数和节点的能量,面向战术adhoc网络,提出了一种基于组移动性的分群算法,并仿真分析了该算法的分群性能。
高性能水性木器漆用pua树脂的制备及漆膜性能研究
,舒金兵,申亮
涂料工业 , 2013,
Abstract: ?以水性pu乳液为原料,通过与丙烯酸酯单体共聚制备了稳定的pua复合乳液。重点考察了pu的加料方式、pu用量以及丙烯酸酯单体的配比对聚合过程和乳液性能的影响。研究表明,在种子乳液聚合基础上采用核壳两层预乳化工艺,pu用量为20%,丙烯酸酯单体配比m(mma)∶m(ba)∶m(2-eha)=6∶2∶2时可得到性能优异的pua复合乳液。漆膜性能的测试结果表明,该pua乳液配制的水性木器清漆具有优异的性能,可满足高档木器对漆膜的高性能要求。
主管领导行为与员工工作表现之关联—初探华人双文化自我的运作
Supervisors’ leadership behaviors and subordinates’ performance:Moderating effects of the bicultural self
 [PDF]


Advances in Psychology (AP) , 2011, DOI: 10.12677/ap.2011.12009
Abstract: 本研究旨在探讨主管的领导风格对拥有「双文化自我」的台湾员工的差异化效应,以此检验员工深层的自我建构是否为影响主管-部属互动关系中领导效能的关键因素。我们以结构性问卷对全职工作者进行施测,共回收466份有效问卷。结果显示:主管的转换型和交易型领导都能显着预测员工的工作表现,且为正向关系。再则,主管转换型领导与员工社会取向自我观的交互作用,转换型领导与个人取向自我观的交互作用,以及交易型领导与个人取向自我观的交互作用都达统计水平。社会取向与个人取向自我观分别强化了转换型及交易型领导对员工之工作表现的正面影响。我们据此建议主管可经由判读员工的核心价值观,来找出最佳激励部属的领导风格。
The present study aimed to examine the moderating effects of bicultural self on the relationships between supervisors’ leadership behaviors and subordinates’ job performance. Using structured questionnaires, we surveyed 466 Taiwanese employees. Results revealed that both transformational and transactional leadership behaviors were positively associated with subordinates’ job performance. Furthermore, both subordinates’ social-oriented and individual-oriented self views strengthened the relationships between transformational/transactional leadership behaviors and job performance. Subordinates’ individual-oriented self views also strengthened the relationship between transactional leadership behavior and job performance. We thus suggested that supervisors need to take into account their subordinates’ self views in mapping out the best motivation strategy.
连续还原法制备Au/Fe3O4纳米复合粒子
,李敏,家祥
- , 2016, DOI: 10.13543/j.bhxbzr.2016.01.007
Abstract: 采用共沉淀法制备20~40nm的Fe3O4颗粒。在Fe3O4悬浮液中分别利用柠檬酸钠单独作为还原剂、四羟甲基氯化磷(THPC)和抗坏血酸共同作为还原剂还原HAuCl4,生成10~90nm的Au纳米颗粒,形成Au/Fe3O4复合颗粒。通过透射电子显微镜和紫外分光光度计对Au/Fe3O4进行表征,研究还原剂种类对Au/Fe3O4粒径、形貌和分散性的影响,结果表明:柠檬酸钠为还原剂时,生成Au纳米颗粒的反应主要在Fe3O4纳米颗粒表面进行,Au纳米颗粒的负载量随柠檬酸钠用量增加而减少,粒径在28.08~77.71nm之间;THPC和抗坏血酸共同作为还原剂时,先在Fe3O4 纳米颗粒表面生成THPC-Au,加入抗坏血酸后生成Au纳米颗粒,粒径在71.44~153.2nm之间。
Abstract:Fe3O4 nanoparticles have been prepared by a co-precipitation method and mixed with an Au(Ⅲ) precursor solution to form a suspension. The Au(Ⅲ) precursor was reduced by different reducing agents such as sodium citrate or tetrakis (hydroxymethyl phosphonium) chloride (THPC) to form metallic Au loaded on the surface of the Fe3O4 nanoparticles. The influence of varying the nature and amount of the reducing agent on the morphology, particle size, and dispersion of the Au/Fe3O4 nanoparticles were investigated. The Au/Fe3O4 nanocomposites were characterized by UV-vis spectroscopy, and transmission electron microscopy (TEM). When sodium citrate was employed as the reducing agent, most Au nanoparticles were loaded on the surface of the Fe3O4 nanoparticles. The size of particles was 28.08-77.71nm. When the reducing agent was a mixture of THPC and ascorbate, most THPC-Au was first loaded on the surface of Fe3O4, and then HAuCl4 was reduced by ascorbate to Au on the surface of Fe3O4. The size of particles was 71.44-153.2nm.
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