基于SOA的智能航运数据服务平台研究

为了实现全国范围的内河航运数据共享,提高我国内河航运的管理水平,需要一种稳定可靠、松耦合的数据共享方式。针对当前的内河航运数据共享需求,并根据当前我国各省的内河航运信息化建设的实际情况,参考国内外成熟的理论基础,提出了基于SOA的数据共享体系,从而实现多节点的关键数据实时共享的应用场景。通过这种方式可以实现内河航运数据共享服务,满足航运信息服务的要求,并适应今后不断增长的共享节点及共享压力。     

ZnO-B2O3-P2O5系封接玻璃的研究

采用熔融法制备了ZnO-B2O3-PO5 系无铅磷酸盐封接玻璃，研究了组成对玻璃结构、特征温度、热膨胀和化学稳定性的影响。结果表明：B2O3和P2O5为玻璃网络形成体，ZnO含量较低时可以参与到玻璃网络结构中，提高玻璃的稳定性；玻璃转变点Tg、熔制温度Tm、封接温度Ts、软化点Td都随P2O5／B2O3减小而增加；B2O3／ZnO是影响玻璃熔制温度的主要因素；ZnO含量对玻璃密度和热膨胀系数影响较大。ZnO-B2O3-PO5 系玻璃在中性环境下的化学稳定性较好。。     

碳纤维水泥石电阻测试方法研究

准确测量碳纤维水泥石的电阻率是碳纤维水泥石的压敏和温敏性能得以应用的关键问题之一。已有研究表明，电阻率测量结果准确性受电极的制作形式及电阻的测试方法影响较大。本文在试验的基础上，分析了几种适用于碳纤维水泥石的电极布置形式的特点及两极法和四极法对电阻测试结果的影响。研究表明，碳纤维水泥石电阻宜采用插入式四极法测量。     

幂律流体三维脉动流场数值模拟

利用ANSYS软件，模拟了振动诱导单螺杆挤出机熔体输送段中非牛顿幂律流体的三维脉动流场，得到了三维脉动流场的瞬时速度分布及螺槽中物料的流动轨迹。结果表明，在脉动流场作用下，非牛顿流体的瞬时速度响应与在驱动壁面上所施加的正弦形式的脉动驱动形式不同，横螺槽方向的环流中心位置受幂律指数影响，且发生周期性改变。振动的引入使得在相同的时间内，物料的流动路程增加，且可增大物料的平均停留时间，有利于改善混合效果。     

Thermal and crystallization characteristics of poly(ethylene terephthalate) with poly(oxybenzoate‐p‐trimethylene terephthalate) copolymer

Poly(ethylene terephthalate) (PET) was blended with two different poly(oxybenzoate‐p‐trimethylene terephthalate) copolymers, designated T28 and T64, with the level of copolymer varying from 1 to 15 wt %. All samples were prepared by solution blending in a 60/40 (by weight) phenol/tetrachloroethane solvent at 50°C. The crystallization behavior of the samples was studied by DSC. The results indicate that both T28 and T64 accelerated the crystallization rate of PET in a manner similar to that of a nucleating agent. The acceleration of PET crystallization rate was most pronounced in the PET/T64 blends with a maximum level at 5 wt % of T64. The melting temperatures for the blends are comparable to that of pure PET. The observed changes in crystallization behavior are explained by the effect of the physical state of the copolyester during PET crystallization as well as the amount of copolymer in the blends. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 1599–1606, 2002     

基于中国电信CEP协议的组件服务应用

面对复杂多变的需求,需要我们梳理出业务的本质,并设计一套与之相适应、易扩展的框架结构,让业务组件化,组件服务化,通过灵活的服务组装,来满足灵活多样的业务需求。本文旨在通过对中国电信CEP协议的剖析,指引如何通过对整个CEP层次结构进行归纳总结,体系化实现服务能力的封装与开放。     

浅谈现代油库中的信息化建设

随着我国科学技术水平和社会经济实力的不断提高,现如今的油库管理应该做到现代化、信息化.在油库管理的信息化建设中,计算机及其系统起到了至关重要的作用.本文介绍了油库管理信息系统的设计原则与具体内容,并详述了计算机系统是如何在油库的信息化管理中应用的.     

工科专业复变函数与积分变换课程实践教学探析

讨论了如何在复变函数与积分变换课程中引入实践教学的方法,分析指出了目前工科专业复变函数与积分变换课程的教学内容存在的突出问题。提出在实际教学中应淡化理论推导及运算技巧,注重复变函数与积分变换课程的思想方法介绍及应用实例;压缩课堂教学时数,增加实践教学内容。     

Hot-compression behavior of Al-1Mn-1Mg alloy

The hot-compression of Al-1Mn-1Mg (mass fraction, %) alloy sample was carried out on a Gleeble-1500 thermo-simulator at deformation temperatures from 320 to 400 ℃ and strain rates from 0.1 to 10 s-1 by total strain of 1.4. Microstructure and texture evolution of the hot-compressed alloy were investigated by optical microscopy and X-ray diffraction analysis, respectively. The results show that the relationship among flow stress σ, deformation temperature T and strain rate ε can be expressed in the form of βσ...     

Numerical analysis on thermal regime in double-loop channel inductor

In order to investigate the temperature distribution, a three-dimensional finite element model (FEM) was developed to simulate the temperature regime in the channels of double-loop inductor, and the simulated results were compared with experimental data from low load trials of a 400 kW inductor. The results of numerical simulations, such as the temperature and Joule heating rate, show reasonable correlation with experimental data. The results indicate that Joule heating rate and the temperature reach the maximum at the corners and the minimum at the centre of the cross-section area. The temperature difference between the inlet and outlet is in an inverse proportion to mass transport. Joule heating rate and the temperature are directly proportional to power frequency. It is concluded that mass transport and power frequency play a critical role in determining the temperature regime and Joule heating rate, the relative permeability of the magnetic core shows no significant influence on temperature regime and Joule heating rate, when the relative permeability varies from 5 000 to 10 000.