图解法优化设计隔离开关传动杆

本文以户内高压隔离开关GN19-12C-400-630和手动操作机构CS6-1的安装调试为例，用图解法分析确定隔离开关传动杆长度，及拐臂方位，从而实现操作机构与隔离开关之间的铰链四杆传动机构的优化设计，避免隔离开关操作过程中发生费力，卡涩，拒分，拒合，碰撞干涉瓷瓶等不良现象。     

高压隔离开关机械故障刚柔耦合动力学分析

高压隔离开关是电力系统中使用规模最大的开关设备,隔离开关机械故障多发但缺乏有效的诊断方法。该文介绍了动力学仿真原理与数值计算方法,并建立了GW5-126型隔离开关动力学仿真模型。通过对GW5-126型隔离开关合闸过程进行刚柔耦合动力学仿真,得到了GW5正常状态、卡涩、三相不同期状态下的仿真结果,分析总结了操动杆转矩在不同机械状态下的变化规律。对比了隔离开关正常与故障状态下的起始转矩、啮合转矩、啮合时间、转矩峰值、转矩峰值时间等特征量,对隔离开关机械故障诊断具有一定的参考价值。     

动车组车顶高压系统优化布置仿真分析

基于有限元法,针对现有车顶设备建立三维仿真模型,通过对电场和气流场的分析,提出两种车顶设备布置优化方案.与原有方案进行对比表明:将高压隔离开关和电压互感器分别向受电弓底架中心线平移438mm和306mm时,受电弓1#位和3#位支柱绝缘子、高压隔离开关1#位绝缘子、高压隔离开关连接导杆及电压互感器连接导杆电场强度均有所下降,而高压隔离开关2#位绝缘子、受电弓2#位支柱绝缘子及电压互感器电场强度均略有增加,仅受电弓2#位支柱绝缘子和电压互感器风压下降;将高压隔离开关及电压互感器平移至受电弓底架中心线时,除高压隔离开关2#位支柱绝缘子表面最大场强略有升高外,其他部件表面最大场强均小于原有方案,且除受电弓2#位支柱绝缘子风压小幅度增加外,其余气压均下降.建议采用将高压隔离开关及电压互感器位置中心点与受电弓底架中心线重合的优化方式.     

高压隔离开关的故障处理

高压隔离开关是在无载情况下断开或接通高压线路的输电设备,以及对被检修的高压母线、断路器等电气设备与带电的高压线路进行电气隔离的设备.一直以来,高压隔离开关都是电力系统中使用量最大、应用范围最广的高压电器设备之一.然而,由于生产工艺、超期维护等因素的影响,高压隔离开关在运行中也出现了操作干涩、拉合失灵、三相合闸不同期、接触部位发热等各种故障现象,这些故障现象若处理不好,将严重威胁电网的安全生产.本文有针对性地剖析了高压隔离开关在运行中所出现的各种主要故障现象的原因,并提出了相应的处理措施.     

钻孔法检测大型钢结构工作应力的研究

为了实现对钢结构工作应力的检测,本文依据局部应力释放原理对钻孔法在其中的应用进行了研究.通过有限元计算对其中的应变释放系数A、B进行了修正,提出了能够修正钻孔温度效应和径向挤压等因素引起的附加应变的工作应力测试与计算方法,使钻孔法在检测中操作简便且具有较高的精度,从而实现了对大型钢结构工作应力的检测.     

一起GIS隔离开关故障的原因分析及处理

该文通过对GIS隔离开关动作时间过长的故障情况进行介绍,结合隔离开关操作机构、触头连接的结构特点及解体检查情况,分析原因为离合器力矩设置不满足设计要求及动触头静摩擦阻力偏大,并就此提出了有效的处理方法,保证设备的安全可靠运行。     

应变能恒等法在叶片疲劳寿命分析中的应用

根据应变能原理,推导出一种在应变疲劳分析中计算局部应力和应变历程的应变能恒等法.采用这种方法计算出带孔薄板应力集中处在恒幅载荷作用下的应力和应变历程,并与弹塑性有限元和有限元局部应力应变法计算结果对比.分析结果表明:当应力小于材料的抗拉强度895 MPa时,采用应变能恒等法计算的应变历程相对误差最大为8.6%,平均应力...     

汽轮机调节汽门操纵机构卡涩诊断方法

以汽轮机调节系统为对象,分析了调节汽门操纵机构中卡涩力的诊断方法,通过受力分析得到弹簧偏心距的理论计算公式,采用AMESIM软件建立了汽轮机电液调节操纵系统模型,在此基础上比较了采用油压与位移检测、BP神经网络和力曲线拟合3种卡涩诊断方法对不同情况下操纵机构卡涩力的检测情况.结果表明:油压与位移检测法能够对卡涩程度进行定性评估,但对轻微卡涩不敏感;BP神经网络对弹簧偏心距的检测较为准确,但需要样本训练网络;力曲线拟合法按照目标函数对油动机输出力曲线进行拟合,并利用拟合后的结果可进一步计算出弹簧偏心距,是卡涩诊断中最为适合的一种方法.     

Ⅱ型动态扩展裂纹尖端的应变损伤场

采用塑性动力学方程,对Ⅱ型裂纹尖端的动态损伤场进行了渐近分析,给出了平面应变情况下的本构方程。位移、应力、应变被用对数系列展开,因此揭示了场的渐近特性。结果表明:在裂纹尖端附近,应力和应变分别具有如下的对数奇异性:     

在线测量Sn-3.5Ag焊点蠕变的电阻应变

以焊料(Sn-3.5Ag)在薄铜基片之间制作截面积约为1 mm2,厚度分别为0.42 mm 和0.10 mm 的试样(其面积与电子封装中的无铅焊点面积大体相同)为对象,利用特制的电子测试系统实时、在线测量试样焊点的微电阻及其剪切应力,并通过串行接口将相关数据传输至计算机.数据经计算机处理后,拟合成实时微电阻和测试时间的关系曲线.基于经典的Griffith 断裂模型,建立一个简易数学模型,从理论上论证电阻应变与焊点机械蠕变裂纹之间的关系.研究结果表明该关系曲线反映焊点的裂纹连续生长、蠕变失效过程,变化趋势与经典结果吻合;在24 MPa 应力作用下,厚度为0.42 mm 的试样最大电阻应变为0.18,最大电阻应变率为2.2×10-3 s-1;在25 MPa应力作用下,厚度为0.10 mm 试样的最大电阻应变为0.036,最大电阻应变率为3.5×10-3 s-1,实验持续时间较厚度为0.42 mm 的试样短.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.