石油产品非加氢脱氮技术对比分析

介绍了原油中含氮化合物的对炼油加工、产品质量和环境等方面的危害,以及石油产品中氮化物的种类;对各种脱氮技术和组合脱氮技术的特点、缺点进行了对比分析,重点介绍了微生物脱氮的原理、主要菌种及反应过程;分析了微生物脱氮技术的关键和工业化的主要障碍,对石油产品非加氢脱氮技术的发展趋势进行了预测。     

京沪高速公路某互通收费式立交方案比选

对京沪高速公路某互通立交的三个方案进行技术经济指标比较和分项评分计算,并提出在高速公路立交方案比选中应考虑的控制因素和比选方法,以提高立交工程项目的使用效率、运营速度及行车安全。     

金融投资收益的度量方法及其实现

针对金融投资中投资收益的度量方法众多且实际中容易混淆、误用的现实,讨论了金融投资中涉及到的各种收益率的含义、相互之间的关系,并进行了对比分析.对一些计算比较复杂的收益率则进一步讨论了其软件实现过程.有利于投资者对投资收益率有一个全面系统的认识,并能够方便地实现其计算.     

Design of a simulation environment for laboratory management by robot organizations

This paper describes the basic concepts needed for a simulation environment capable of supporting the design of robot organizations for managing chemical, or similar, laboratories on the planned U.S. Space Station. The environment should facilitate a thorough study of the problems to be encountered in assigning the responsibility of managing a nonlife-critical, but mission valuable, process to an organized group of robots. In the first phase of the work, we seek to employ the simulation environment to develop robot cognitive systems and strategies for effective multi-robot management of chemical experiments. Later phases will explore human-robot interaction and development of robot autonomy.Supported by NASA-Ames Cooperative Agreement No. NCC 2-525, A Simulation Environment for Laboratory Management by Robot Organizations.     

百色站E-601蒸发器与Ф80cm、Ф20cm蒸发器对比观测资料分析

根据百色站多年对E-601与Ф80cm、Ф20cm蒸发器对比观测试验资料以及同步的气温、气压、湿度、风速和蒸发器等气象辅助项目观测资料，对蒸发的特性、蒸发的折算系数及其与气象因素的关系进行分析和研究。     

长尾理论视角下基于DCA 的网络自助出版推荐系统

随着自助出版系统文本规模的迅速增长,选用合理的推荐技术有利于＂长尾＂文本的发掘和价值实现。针对自助出版文本,设计了基于有向图的聚类算法DCA（Directed Graph Clustering Algorithm）,将聚类看成是确定对象的过程,根据词间信息传递量的大小选定特征词集对文本进行聚类。为改善＂长尾＂文本聚类的有效性,文中所述系统设置了浮动相似度阙值及推荐公共池。实验结果表明,较之K-Means算法,该算法有较强的自适应性和通用性,能有效地运用到自助出版文本的个性化推荐系统领域。     

高校实验室废液现状及处理方法

目前高校实验室排放的废液已经成了一种不容忽视的污染源。针对国内高校实验室排污现状,对实验室废液的来源、种类进行了分类,同时对不同性质废液的处理方法进行了论述。     

The innovative use of low heat input in welding: experiences on ‘cladding’ and brazing using the CMT processPaper presented at the 4th National Welding Day,Workshop: “Brazing”, Genoa, 25–26 October 2007.

As is well known in the field of welding technology, the heat input in a joining process is a defining factor of the results that can be obtained in numerous aspects directly affecting metallurgical phenomena, technological properties and the integrity of the welded joint, as well as deformations and residual stresses. Furthermore, a different heat input can be decisive on process productivity and economy.

This article concerns tests conducted in the IIS Special Welding Process laboratory with the collaboration of Arroweld Italia pertaining to two technological subjects of considerable interest, such as ‘cladding’ with high corrosion resistance alloys and thin layer brazing, both using continuous wire welding methods with gas shielding, in an entirely particular version known as ‘Cold Metal Transfer – CMT^®’.

In the case of ‘cladding’, the most critical aspects of anticorrosion overlay, such as penetration into the substrate and level of dilution, which frequently compromise the intrinsic corrosion resistance of the coating, are investigated.

On the other hand, with regard to brazing, the degree of deformability of brazed structures is investigated, as well as the impact of the process on the mechanical properties of the base material and any influence, or otherwise, of the presence of galvanizing layers on brazed joint quality (bonding, spraying, etc.).     

The Role of the Laboratory in Undergraduate Engineering Education

The function of the engineering profession is to manipulate materials, energy, and information, thereby creating benefit for humankind. To do this successfully, engineers must have a knowledge of nature that goes beyond mere theory—knowledge that is traditionally gained in educational laboratories. Over the years, however, the nature of these laboratories has changed. This paper describes the history of some of these changes and explores in some depth a few of the major factors influencing laboratories today. In particular, the paper considers the lack of coherent learning objectives for laboratories and how this lack has limited the effectiveness of laboratories and hampered meaningful research in the area. A list of fundamental objectives is presented along with suggestions for possible future research.     

基于保密函数计算的安全两方比较协议*

安全两方比较大小是保密计算的一个特例和基本模块,在移动代码和电子商务安全中有重要应用。当前的解决方案存在较高计算和通信开销、比较数的范围有限等缺点。基于修改的ElGamal算法提出并证明了乘法、混合乘法、加法和减法同态加密系统。用同态加密系统双方共同构建一个双方都未知的保密函数,基于此保密函数和同态加密系统设计了半诚实模型下安全两方比较协议。证明、实例和与其他协议比较表明其具有安全性、公平性、低的计算和通信开销、秘密比较整数等特点。