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Churchill T. Ako Alfred A. Susu 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1986,36(11):519-526
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. 相似文献
33.
杨素素 《计算机测量与控制》2017,25(3):55-59
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。 相似文献
34.
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。 相似文献
35.
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. 相似文献
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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. 相似文献
39.
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. 相似文献
40.
医学体数据可视化在临床上已成为辅助诊断和辅助治疗的重要手段,其技术也成为近年来研究和应用的热点。其中讨论了体绘制算法中最常用的光线投射法,并利用Visualization Tool Kit(VTK),一个包含了多种体绘制技术的基于面向对象方法设计的、功能强大的可视化类库,来实现断层医学图像的三维重建,重建效果表明基于VTK的体绘制技术具有应用灵活、重建效果逼真、重建速度较快等优点。 相似文献