阜新市细河改造工程坝基渗漏计算及处理效果分析

阜新市细河改造工程由四座橡胶坝和两岸防洪大堤组成，由于堤(坝)基第四系冲洪积层广泛发育，存在渗漏同题。合理选择施工处理方案，是工程成功的关键。作者根据场区不同的地质条件环境条件采取有针对性的不同处理方案，既解决了防渗问题又缩短了施工工期，降低工程造价，取得了很好的经济效益和社会效益。     

潜油电泵易损零部件失效分析方法

通过对大庆油田近5 a潜油电泵易损零部件的数据统计,应用可靠性分析理论和方法研究了易损零部件的失效规律,得出4大部件的故障率占整个机组系统的91.7%,其可靠度由小到大的次序为电机、保护器、电泵和分离器。在这4大部件中,可靠度较低的零件主要有泵轴、叶导轮、扶正轴承、胶囊和保护器轴,其中泵轴、叶导轮、扶正轴承的主要失效模式是磨损,连接螺栓的主要失效模式是断裂失效。     

辽河催化裂化澄清油中间馏分热反应研究

采用先加入絮凝剂脱灰，再经减压蒸馏切割420～500℃馏分的方法，将辽河催化裂化澄清油预处理，考察了澄清油、加入絮凝剂脱灰后的澄清油以及脱灰后再减压蒸馏所得的中间馏分这3种原料在热转化过程中中间相的转化历程，并采用偏光显微镜观察热转化产物。结果表明，澄清油预处理效果明显，所得中间馏分具有较低的H／C原子比（nH／nC）和适宜的组成分布，是生产针状焦的理想原料。热转化产物的光学组织结构属于各向异性发达的广域-流线型结构。     

达县广电城域网运行状况及故障分析

对达县广电城域网运行状况进行了检测，认为不能满足用户上网需要的原因除了网内病毒感染之外，设备与设备之间链路层协商及连接线出现故障。改进措施主要有两点：解决NE08E与S8505的连接问题，解决S8505上的DHCP服务器不能分配IP地址问题。     

分形图像压缩的信源信道联合编码

本文针对分形图像压缩编码后所得各部分压缩数据的特点，分析了分形图像压缩各部分数据在传输中对传输信道干扰的敏感程度，并根据各部分数据对信道干扰的敏感程度的不同，提出了一种分形图像压缩的信源信道联合编码方法。仿真结果表明，采用所提出的分形图像压缩的信源信道联合编码方法后，分形图像压缩数据对传输信道的敏感程度降低，图像质量有较大提高。     

Micromechanical modelling of ductile crack growth in the binder phase of WC–Co

This study focuses on numerical simulation of ductile failure in the Co binder phase of WC–Co hardmetal. The growth of edge cracks under mode I loading is considered. A computational micromechanics approach is taken where the Co binder ligaments are explicitly represented in finite element models. An embedding technique is employed. Crystal plasticity theory is used to represent plastic deformation in the Co ligaments. Crack propagation in the binder is simulated using an element removal technique based on a modified Rice and Tracey model for ductile void growth, and fracture resistance curves are generated. Parameter studies are performed for variations in microstructrual parameters such as numbers of Co ligaments ahead of the crack tip and local Co volume fraction. The importance of thermal residual stresses and finite element mesh density are also investigated.     

First Harmonic (2f) Characterisation of Resonant Frequency and Q-Factor of Micromechanical Transducers

In this paper, the response to the first harmonic component (2f) of the electrostatic force in single terminal driven electrostatic comb-drive and parallel-plate drive was used as a signal to extract device parameters, namely, the Q-factor and resonant frequency instead of the fundamental (1f) resonance response. It is shown that the difficulty in motional measurement due to electrical cross-talk (parasitics) using 1f measurement can be overcome with a higher signal-to-noise ratio of the 2f signal. Both atmospheric (low-Q) and reduced pressure environment were investigated using off-chip electronics and lock-in amplifier. The measurements were done on the electrostatic comb-drive and capacitive parallel plate sensing plates that form the two core modules of a yaw rate sensor (dual-axis resonator). The effects of AC and DC bias voltages on the measured response have been investigated. Experimental amplitude and phase response data have been analysed using the Lorentzian curve-fit, Resonance Curve Area (RCA) method, the half-power bandwidth method (3 dB) and the Nyquist plot for data fitting and determination of the Q-factor and resonance frequency.     

复合载荷下波纹管横向非线性弯曲摄动有限元法

采用新的小参数、将摄动法和有限元法相结合,研究了复合载荷作用下波纹管横向非线性弯曲的位移和应力分布。小参数为结构环向应变的均方根。将节点位移摄动展开,并以复合载荷的等效节点载荷为参考载荷,将其公共系数1摄动展开。由此划分载荷的级别、建立各级载荷和相应位移的关系,避免了常规的迭代运算。算例为一考虑自重的U型波纹管在注满水时的横向非线性弯曲问题。计算表明,波纹管的挠度和膜应力有非常显著的非线性效应;当最大挠度与壁厚之比达到5.1后本法将失效。本法在摄动小参数的选取和复合载荷的处理上有特色,能解决较大的挠度问题。     

光纤接入网步入快速发展期

光纤接入一直是多年来人们不断追求的梦想和探索的技术方向，但由于成本、技术、需求等方面的障碍，至今还没有得到大规模推广与发展。然而，这种局面最近有了很大的改观，出现可迅速发展的势头。主要是因为一些国家政策的扶持、运营商竞争的需要、对收入的追求，以及设备本身价格的下降，光纤接入技术由于各种原因，至今尚未在全球广泛应用，但在日本、美国、瑞典和意大利等国都获得了较多的应用。在中国，光纤接入也有了良好的开端，将在大城市广泛应用，并逐渐推广到全国。