电力电缆线路的冲击特性长度与过电压保护配置

本文通过对雷电冲击波在电缆线路中的传播特性——冲击特性长度的分析和计算,提出了各电压等级电缆线路的冲击特性长度,可供电缆与架空线直连情况的过电压保护选用配置避雷器时参考。     

上海市中心城轨道交通网络规划合理规模研究

介绍了估算城市轨道交通网络规划规模的3种方法--几何分析法、运输强度分析法及类比分析法,并结合上海市的实际情况对上海市中心城轨道交通网络规划规模进行了估算。通过对比和分析各种估算结果,提出了上海市中心城轨道交通网络规划的合理规模。     

电力电缆线路的冲击特性长度与过电压保护配置

本文通过对雷电冲击波在电缆线路中的传播特性——冲击特性长度的分析和计算,提出了各电压等级电缆线路的冲击特性长度,可供电缆与架空线直连情况的过电压保护选用配置避雷器时参考。     

高压XLPE电缆系统UHF局部放电信号传输特性的初步研究

本文模拟一段实际电缆线路,研究了在UHF频段下,绝缘内部各种局部放电沿XLPE电缆系统的传输特性。试验结果显示,在UHF频段,外部干扰相对稀少和稳定,可以有效的排除干扰信号;同时发现,不同类型的缺陷在工频电压激励下,放电传输特性存在很大差异,这些特征可用作放电类型识别的依据。     

基于内模控制原理的反馈控制器的整定

研究了用内模控制原理导出的反馈控制器ＰＩＤ的整定算法，它仅需用一个滤波器参数λ的改变来影响系统的响应特性。对工业生产中常见的过程模型进行数字仿真，并与常规整定算法进行了比较。结果表明，本算法应用于反馈控制器的参数整定时，不仅可改善控制质量，而且能有效改善系统棒稳定性，为实施本算法，提供了有关的参考数据，并实际系统中验证了本算法。     

光滑平面推力轴承的热流体动力特性

动压轴承的热流体动力特性是指计入沿膜厚方向的温度分布及油层和固体传热效应后的承载量、摩擦力等特性。本文采取适当的数学模型和方法,求得了推力轴承在广宽参数范围内的热流体动力特性,并提供系统的设计计算资料。将无量纲参数重新组合以便于进行参数分析并可更简洁地表达数据。文中给出了热效应载荷修正系数、最小膜厚修正系数及摩擦力修正系数。这些系数可用来很方便地估算推力轴承的热效应,所得结果与已发表的算例十分接近。     

三种动力学多参数估值方法统计特性的研究

本文运用一种在计算值中加入随机误差作为实验数据的效学实验方法,以三元M~α拟一级反应体系为例,研究了三种能够用于复杂反应动力学双曲型数学模型多参数估值的方法的统计特性,并进行了比较。结果表明,试差矩阵法比特征向量法有更好的方法统计特性,能耐受较大的实验误差,获得令人满意的参数值。曲线拟合法统计特性低劣,实验误差对模型参数估值准确度的影响较大,不能很好地用于复杂反应体系动力学的多参数估值。     

统计学理论在汽液平衡研究中的应用——Ⅰ.热力学一致性校验

本文提出了一个建筑在统计学基础上的、校验汽液平衡数据热力学一致性的方法。在从T、P、x计算y的直接法中使用的函数F,被用来表达实际行为与理论一致性间的偏离。F直接由原始实验数据计算,其中导数值用抛物线法根据相邻三点确定,不需要通常的光滑化处理。F的正态分布特性则由模拟随机数据的研究加以证实。一种参数的显著性检验方法,结合合理的误差分析,被用来对实验数据在不同误差等级下的一致性进行判断。提供的若干实例表明,本方法有很大的灵活性,能比常规方法作出更合理的检验。     

电力机车司机室空调系统降温速率分析

介绍了电力机车司机室空调系统降温试验,在整理大量数据的基础上,提出了机车空调系统降温曲线的数学表达式,进而推导出空调系统的降温速率表达式,引出一个评价空调系统的降温特性的参数--降温系数λ.从定性和定量两方面分析了降温系数,并给出了其物理意义.这些工作有助于深入研究空调系统的降温特性.     

生产管路中离心泵流量与压头的计算

作为流体输送的常用设备,离心泵在医药、石油、化工生产中广泛使用。生产管路中离心泵的流量与压头现一般都是根据离心泵的厂家所提供的基本特性参数曲线即离心泵特性曲线和管路特性来进行计算。由于泵的特性曲线图在实际使用中存在着许多不便,特别是对同一型号泵配以     

APPLICATION OF LORNOXICAM TO PATIENT-CONTROLLED ANALGESIA IN PATIENTS UNDERGOING ABDOMINAL SURGERIES

FOR anesthesiologis s ,treatingpostoperativepainhas alwaysbeen a problem.Althoughopioidshave been provedtobe effective,theirsideeffectscouldnotbeignored.With thedevelopmentofscienceand pharmacology,many drugs with aspectsof satisfactoryanalgesicefficacyand couldbe welltoleratedby patientshave been developed.And lornoxicamisone of them, which isa non-steroidalanti-inflammatorydrug (NSAID ), with analgesic, anti-infl-ammatory,andantipyreticproperties.Itseliminationhalf-time(3 to 5 hours) isle…     

Dr.Zhang Ren''''s Experience in the Acupuncture Treatment of Different Diseases with the Same Therapeutic Principle

Dr.Zhang Ren,the chief physician,is the chairman of Shanghai Acupuncture and Moxibustion Association.Having been engaged in medicine for about 40 years,he is experienced in treating various intractable diseases.In his long years of clinical practice,he advocates taking the TCM differentiation as the basis to seek for the acupuncture method for treatment of modern intractable diseases.The author of this essay had the fortune to follow Dr.Zhang in study.The following is a summary of Dr.Zhang's experience in the acupuncture treatment for different intractable diseases with the same therapeutic principle.     

Luo Lingjie''''s Experience in Treating Chronic Nephropathy

In treating chronic nephropathy,Luo Lingjie,a chief physician,pays attention to regulating the balance between yin and yang,treating infection if present,and removing pathogenic factors.He prescribes gentle drugs and uses carefully strongly warming-tonifying ones,emphasizes the importance of persuading the patient to persist in treatment with medication and nurse one's health for recuperation,and is good at combined use of TCM and western medicine therapy and brings the merits of various therapies into full play,with obvious theraoeutic effects.     

Acupuncture Combined with Spinal Tui Na for Treatment of Primary Dysmenorrhea in 30 Cases

Objective: To observe the therapeutic effects in acupunture treatment of primary dysmenorrhea combined with spinal Tui Na, and study its mechanism. Methods: Thirty cases of the treatment group were treated by acupuncture combined with spinal Tui Na, and thirty cases in the control group were treated by routine acupuncture. Results: The total effective rate was 93.3% in the treatment group, and 73.3% in the control group, with a significant difference between the two groups (P<0.05). Conclusions: Acupuncture combined with spinal Tui Na has good prospects for treatment of primary dysmenorrhea.     

猪肺磷脂注射液联合经鼻持续气道正压通气对呼吸衰竭早产儿的临床疗效及肌酸激酶同工酶活性的影响

目的 探讨猪肺磷脂注射液联合经鼻持续气道正压通气(NCPAP)对呼吸衰竭早产儿的临床疗效及肌酸激酶同工酶活性(CK-MB)的影响.方法 选取呼吸衰竭早产儿80例,分为观察组和对照组各40例.对照组采用NCPAP给氧治疗,观察组给予NCPAP给氧联合猪肺磷脂气管内给药.观察两组患儿治疗前及治疗12h、24 h后PaO2、PaCO2、血氧饱和度(SaO2)、pH的变化情况,检测治疗前及治疗5d后血清CK-MB水平;评估两组患儿的临床治疗效果.结果 两组患儿PaO2、PaCO2、SaO2、pH比较,差异均有统计学意义(P＜0.05),其中观察组治疗后的PaO2、SaO2、pH均高于对照组,PaCO2则低于对照组.两组的PaO2、SaO2、pH均随观察时间延长而升高(P＜0.05),PaCO2均随观察时间的延长而降低(P＜0.05).观察组治疗有效率为87.5％,显著高于对照组的70.0％ (P ＜0.05).治疗5d后两组患儿血清CK-MB水平均较前降低(P＜0.05),且观察组明显低于对照组(P＜0.05).结论 猪肺磷脂注射液气管内给药联合NCPAP可以显著降低呼吸衰竭早产儿CK-MB的含量,提高治疗有效率,起到很好的呼吸循环支持作用.     

Survey and practice of reporting quality of randomized controlled clinical trials on traditional Chinese medicine

Evidence obtained from randomized controlled trials （RCTs） has been generally accepted as the gold standard in the evaluation of clinical effectiveness. Readers need to understand the trial design, implementation, results, analysis and interpretation, so as to fully Jnderstand the results of RCTs. Thus, the investigators of RCTs have to report these items in a complete, accurate and clear manner. Since 1998, we have conducted several evaluations on the reporting quality of RCTs published in Chinese journals on traditional Chinese medicine （TCM） and results have shown that there is an urgent need for higher quality RCTs on TCM.     

TCM Treatment of Ankylosing Spondylitis by Tonifying the Kidney and Strengthening the Governor Vessel

Ankylosing spondylitis is a chronic and progressive disorder with inflammation mainly involving the central axis joints. It mainly affects the cervical spine and the lumbosacral area, with the pathogenesis closely related to the kidney and the Governor Vessel (GV). TCM holds that the syndrome is deficiency in origin and excess in superficiality, which is due to insufficiency of the kidney, deficiency of GV, and blocking of the channels with the invasion of exogenous evil, leading to poor circulation of qi and blood and malnutrition of the bones, muscles and joints. The TCM method of tonifying the kidney and strengthening GV to regulate circulation of qi and blood and check the arthralgia pain should be adopted, with the Kidney-Tonifying and GV Strengthening Decoction (益肾强督汤) prescribed.     

IMPROVING P-gp EXPRESSION IN HUMAN MONONUCLEAR CELLS IN VITRO TRANSFECTED BY MULTIDRUG RESISTANCE-1 mRNA

CHEMOTHERAPY playsa greatrolein the treat- ment of malignanttumors,especiallyingynecolo- gicalones.But inanticancerchemotherapy,leuko-cytopeniaisfrequentlytheprimarydose-limitingsideeffect factor.Moreover,cancersarefrequentlychemoresistantbe-causeof overexpressionof P-glycoprotein(P-gp), which isencodedby multidrugresistancegene (MDR1 ) and detectableinup to50% ofhuman cancersand renderscellsresistancetoanticancerdrugs.The safetyand potentialtherapeuticbenefitof mdr1 gene transferredto h…