高压电场技术在食品杀菌中的应用研究进展

高压电场技术是极具有工业化应用前景的低温杀菌技术之一，由于其杀菌效率高、能耗小、无污染且对食品品质影响小，因而在未来食品杀菌领域具有广阔的发展前景。本文对常见的两种高压电场类型，高压静电场和高压脉冲电场的装置特点、杀菌相关电场参数以及杀菌机理进行了介绍，综述了二者在固体和液体食品杀菌中的应用研究进展，介绍了国内外对传统电场设备暴露的缺点的改进情况，并总结了高压电场与其他杀菌技术的联用，最后展望了高压电场技术在未来的发展前景。     

n-octane dehydrocyclisation on monofunctional and bifunctional Pt/Al2O3 catalyst

The dehydrocyclisation of n-octane to iso-octane, ethylbenzene and o-, m- and p-xylene was investigated on monofunctional (non-acidic) and bifunctional (acidic) Pt/Al₂O₃ catalyst in a microcatalytic reactor with hydrogen as carrier at 1.8 atm and 563–673 K. On bifunctional Pt/Al₂O₃, the total conversion of n-octane started from a high value and decreased with increasing temperature for all pulse sizes investigated. The primary product of n-octane conversion on acidic Pt/Al₂O₃ was iso-octane. The product yield-temperature profiles showed a large initial production of iso-octane which decreased to a minimum as the catalyst temperature increased due to its conversion to ethylbenzene and o-xylene. On non-acidic Pt/Al₂O₃, the total conversion of n-octane increased initially and then went through a maximum as the catalyst temperature increased. The primary products of the reaction were found to be ethylbenzene and o-xylene, indicative of the activity of the metal to effect these ring closure reactions.     

基于Storm的城市消防联网远程监控系统的实时数据处理应用

针对城市消防联网远程监控系统中实时信息数据逐渐增长而引出的大数据问题,传统的消防系统无法实时、高效地处理消防实时数据的问题,提出了一种基于云计算和Storm实时数据处理系统的解决方案;对于开源的Storm框架进行需求和性能分析,实现对其技术架构上的改进,并结合消防系统的特点,提出一套高实时性、高可扩展性的消防联网监控中心的数据实时处理的体系架构,同时也进行了云计算平台的搭建,利用心跳检测机制保证各个监控单位的实时性连接;研究表明,基于云计算和Storm平台架构完全适用于消防联网监控中心的实时消防数据的处理,具有高效性、高可靠性、性能显著等特性。     

1-30MHz传输线变压器巴伦的设计

介绍了传输线变压器的工作原理,应用电报方程分析它的阻抗变换特性,得到负载阻抗、源阻抗与传输线特性阻抗之间满足的最佳传输条件,给出传输线特性阻抗、传输线长度、磁芯材料、类型和导线匝数的确定方法,特别考虑了在选择磁芯材料的时候铁氧体磁导率随频率变化的影响,为传输线变压器巴伦的设计和优化提供了理论基础。     

Gas Condensate Reservoir Modeling: Part II. Development of a Stochastic Model

Abstract

The mass balance partial differential equation, being deterministic, was transformed into a Feynman-Kac differential equation, which is stochastic in nature, by employing some enabling but safe assumptions. The stochastic parameter κ was determined and found to be zero. This is a requirement for the applicability of the stochastic model to reservoir simulation.     

Simultaneous Reaction-Deactivation Kinetics in N-octane and Methylcyclopentane Reforming Reactions on Platinum-Containing Catalysts

The deactivation data obtained from the multiple regeneration of platinum-containing catalysts were utilized to explore the efficiency of reforming catalyst utilization. The data were collected in a CSTR at a total pressure of 101.325 kPa and W/F values up to 0.33 g min/cm³. The reactive system investigated was the re-forming and coking of n-octane and methylcyclopentane on the monometallic Pt/Al₂O₃ and the bimetallic Pt-Re/Al₂O₃ catalysts. The deactivation models combined the kinetic equation with the coking equation; both of these equations were derived from mechanistic models. The kinetic expressions were based on the models of Susu et al. for n-octane reaction and Dartingues et al. for methylcyclopentane reaction. The coking mechanism of Corella and Asua was used for the coking reaction. The coupling of the two models resulted in a dynamic expression, and the parameter estimates were carried out without decoupling the main reaction from the coking reaction. The model formulation affords the estimation of the level of residual activity by the incorporation of a factor, f, representing incomplete deactivation. A high value of f was obtained for all deactivation-kinetic data indicating high utilization efficiency for the catalysts for the two reactants, regardless of the large difference in the coking ability of the hydrocarbon species.     

钻进参数优化研究综述

钻进参数优化是钻井工程中的关键技术之一。介绍了现有的钻进参数优化数学模型,并对适用于模型求解的几种常用传统优化算法、人工智能优化算法及改进的混合算法进行了总结分析,最后提出了当前钻进参数优化研究中仍需解决的问题及未来研究趋势。     

A New Space-Time Multiple Trellis Coded Modulation Scheme Using Transmit Symbol Phase Rotation

Space-time multiple trellis coded modulation (ST-MTCM) has been introduced in order to achieve maximum transmit diversity gain and larger coding gain with the existence of parallel paths. In our previous research, we designed a new coded modulation scheme for ST-MTCM which simultaneously maximizes the coding gain and diversity gain utilizing Hadamard Matrix giving the maximum determinant. This scheme, however, cannot achieve full transmit rate. In this paper, we extend our research so as to achieve full rate transmission as well as maximum coding and diversity gain. In addition, Super-Orthogonal Space-Time Trellis Code (SO-STTC) is well known for its high coding gain, full diversity gain and full transmit rate. Even though our proposed scheme is essentially the same as SO-STTC, we show in this paper that our proposed code design is different from SO-STTC, and achieves better performance. Our proposed code design utilizes transmit symbol phase rotation at a certain time slot so as to avoid same path transition in trellis, which occurs with conventional SO-STTC scheme. We design codes with different way of phase rotation for different MPSK modulation scheme, and simulation results show the improvements of our proposed codes for MPSK modulation with different number of states. Susu Jiang was born in Jilin, China, in 1979. She received the B.E. and M.S. degrees in electrical and computer engineering from Yokohama National University, Yokohama, Japan, in 2001 and 2003, respectively. She is currently working toward the Ph.D. degree in electrical and computer engineering at Yokohama National University, Yokohama, Japan. Her research interests include space-time coding, channel coding in wireless communications, and information theory. She is a student member of the IEICE and IEEE. Ryuji Kohno received the Ph.D. degree from the University of Tokyo in 1984. Dr. Kohno is currently a Professor of the Division of Physics, Electrical and Computer Engineering, Yokohama National University. In his currier he was a director of Advanced Telecommunications Laboratory of SONY CSL during 1998–2002 and currently a director of UWB Technology institute of National Institute of Information and Communications Technology (NICT). In his academic activities, he was elected as a member of the Board of Governors of IEEE Information Theory (IT) Society in 2000 and 2003. He has played a role of an editor of the IEEE Transactions on IT, Communications, and Intelligent Transport Systems (ITS). He is a fellow of IEICE, vice-president of Engineering Sciences Society of IEICE and has been the Chairman of the IEICE Technical Committee on Spread Spectrum Technology, that on ITS, and that on Software Defined Radio (SDR). Prof. Kohno has contributed for organizing many international conferences, such as an chair-in honor of 2002 & 2003 International Conference of SDR (SDR'02 & SDR'03), a TPC co-chair of 2003 International Workshop on UWB Systems (IWUWBS'03), and a general co-chair of 2003 IEEE International Symposium on IT (ISIT'03), that of Joint UWBST&IWUWB'04 and so on. He was awarded IEICE Greatest Contribution Award and NTT DoCoMo Mobile Science Award in 1999 and 2002, respectively.     

基于分割的肝癌三维可视化研究与实现

提出一种基于分割的肝癌三维可视化方法.利用动态自适应区域生长算法分别把肝脏、肿瘤以及肝内血管从图像中提取出来;通过调用VTK开发包中的MC面绘制三维蕈建算法,对这些器官和组织进行三维绘制.这种方法分割准确.重建的三维器官模型立体感强,形态逼真,便于观察肿瘤与其它器官组织的空间位置关系.