- 董瑛;高伟;郑义;尤政;
<正>Introduction Commercially available gas sensors include metal oxide sensors (MOS), conductive polymer (CP) resistors, quartz crystal microbalance (QCM), surface acoustic wave (SAW) sensors, field effect transistors (FET), thermopiles (TMP), and conductive oligomers (CO)[1-4].In recent years, there has been an increasing interest in
2010年05期 v.15 481-488页 [查看摘要][在线阅读][下载 1376K] [下载次数：63 ] |[网刊下载次数：0 ] |[引用频次：1 ] |[阅读次数：0 ] - 刘大炜;王立平;李铁民;黄鹏;
<正>Introduction Unlike serial machines, which suffer from the accumulation of joint errors, parallel kinematic machines (PKMs) are considered to have high accuracy[1]. However, recent investigations have shown that the PKM is not necessarily more accurate than a serial machine with the same manufacturing and assembling
2010年05期 v.15 489-497页 [查看摘要][在线阅读][下载 547K] [下载次数：87 ] |[网刊下载次数：0 ] |[引用频次：4 ] |[阅读次数：0 ] - 周筠;赵晓波;
<正>Introduction Practical inventory systems usually satisfy demands from more than one customer class, each of which may possess respective characteristics, such as affordable price, distribution type, treatment for shortages, etc.
2010年05期 v.15 498-508页 [查看摘要][在线阅读][下载 549K] [下载次数：119 ] |[网刊下载次数：0 ] |[引用频次：0 ] |[阅读次数：0 ] - 徐博强;李铁民;刘辛军;吴军;
<正>Introduction 3RRR non-redundant parallel mechanisms (PMs) have been extensively studied by scholars in recent years[1-4].However, the drawbacks of 3RRR PMs, such as having too many singularities and a lack of stiffness, dramatically hamper their use. In these situations, redundancy
2010年05期 v.15 509-516页 [查看摘要][在线阅读][下载 1538K] [下载次数：244 ] |[网刊下载次数：0 ] |[引用频次：20 ] |[阅读次数：0 ] - 曹洋;胡春华;马伯志;郝红伟;李路明;王伟明;
<正>Introduction Use of implantable medical devices (IMDs), for heart, neurological, and urinary disorders; and for hearing loss, has increased rapidly in recent years. The devices involve pacemakers, implantable cardioverter defibrillators (ICDs), neuro-stimulators, drug delivery systems,
2010年05期 v.15 517-525页 [查看摘要][在线阅读][下载 947K] [下载次数：75 ] |[网刊下载次数：0 ] |[引用频次：7 ] |[阅读次数：0 ] - 张浩然;颜永年;张人佶;林峰;
<正>Introduction The large-scale frame has many industrial applications. It is one of the most important components used in rolling, die forging, extrusion, and free forging. How-ever, once the frame can no longer perform its function, the whole press must be discarded[1]. The conversion of immense force and energy is accomplished within
2010年05期 v.15 526-533页 [查看摘要][在线阅读][下载 1926K] [下载次数：93 ] |[网刊下载次数：0 ] |[引用频次：6 ] |[阅读次数：0 ] - Didik Aryanto;Abd. Khamim Ismail;Zulkafli Othaman;
<正>Introduction Self-assembled quantum dots (QDs) that are grown using epitaxial techniques have been extensively stud-ied due to their potential for various applications. Self-assembled InxGa1-xAs/GaAs QDs represent one
2010年05期 v.15 534-539页 [查看摘要][在线阅读][下载 977K] [下载次数：32 ] |[网刊下载次数：0 ] |[引用频次：0 ] |[阅读次数：0 ] - 宫赫;朱东;张明;张西正;
<正>Introduction Bone functions are very complex, with functions fromwithstanding loads and supporting body weight toserving as a site for the development and storage ofblood cells. There are many disorders and diseases thataffect bones. Osteoporosis is a systemic skeletal dis-ease characterized by low bone mass and micro-architectural deterioration, with a consequent increase
2010年05期 v.15 540-546页 [查看摘要][在线阅读][下载 546K] [下载次数：76 ] |[网刊下载次数：0 ] |[引用频次：0 ] |[阅读次数：0 ] - 姚蕊;唐晓强;李铁民;林春深;
<正>Introduction Accuracy is a vital performance index for parallel ma-nipulators which is influenced by several factors, in-cluding errors in the drive cell, assembly errors, manufacturing errors, and the structural design. The large number of components in parallel manipulators
2010年05期 v.15 547-554页 [查看摘要][在线阅读][下载 1277K] [下载次数：239 ] |[网刊下载次数：0 ] |[引用频次：25 ] |[阅读次数：0 ] - 李玲;苑明顺;李全明;
<正>Introduction With the development of computation fluid dynamic (CFD) and the need for complicated flow simulation, more and more research has been conducted using com-putational grids. For the multi-block structured grids of large eddy simulation (LES) or direct numerical simu-lation (DNS) frames, the local grid refinement method
2010年05期 v.15 555-560页 [查看摘要][在线阅读][下载 1000K] [下载次数：49 ] |[网刊下载次数：0 ] |[引用频次：0 ] |[阅读次数：0 ] - 王英奎;江春波;
<正>Introduction The flood discharge of a large hydropower station is always related to orifices in the dam body and the spillway tunnels, as in such facilities as Ertan, Xiaowan, Zipingpu, Xiluodu, and Jinping-I. Most of these hydropower stations were built in narrow valleys
2010年05期 v.15 561-565页 [查看摘要][在线阅读][下载 815K] [下载次数：51 ] |[网刊下载次数：0 ] |[引用频次：2 ] |[阅读次数：0 ] - 李吉勤;班慧勇;石永久;王元清;张振学;
<正>Introduction In recent years the production of aluminum alloy has leaped to second place in overall metal material pro-duction, surpassed only by steel. In addition to use in the aviation industry, aluminum alloy has begun to be applied in the machinery manufacturing industry and
2010年05期 v.15 566-573页 [查看摘要][在线阅读][下载 1322K] [下载次数：89 ] |[网刊下载次数：0 ] |[引用频次：2 ] |[阅读次数：0 ] - 李玲;覃春丽;彭期冬;晏智锋;高千红;
<正>Introduction Since the Three Gorges reservoir started to store water in 2003, the strong turbulence in the water flow from the flood discharge has increased the mass transfer from the air to the water jets, which greatly increases the dissolved oxygen (DO) concentrations downstream.
2010年05期 v.15 574-579页 [查看摘要][在线阅读][下载 597K] [下载次数：113 ] |[网刊下载次数：0 ] |[引用频次：4 ] |[阅读次数：0 ] - 李轶;饶婷;刘志刚;
<正>Introduction Cometabolic degradation of chlorinated organics oc-curs by nonspecific action of oxygenases induced by growth substrates such as toluene, phenol, methane, and propane[1]. Such degradation is an important bio-transformation pathway for the removal
2010年05期 v.15 580-585页 [查看摘要][在线阅读][下载 1079K] [下载次数：68 ] |[网刊下载次数：0 ] |[引用频次：3 ] |[阅读次数：0 ] - 曾庆成;杨忠振;陈超;
<正>Introduction Since the 1970s, the containerization of cargo has rap-idly increased. With the rapid development of con-tainer transport, container shipping lines have devel-oped from simple "point-to-point" operations to the present complicated shapes with "multipoint composi-tion" and multiple structures. At the same time, the
2010年05期 v.15 586-594页 [查看摘要][在线阅读][下载 375K] [下载次数：372 ] |[网刊下载次数：0 ] |[引用频次：18 ] |[阅读次数：3 ] - 丁文捷;郑思齐;郭晓旸;
<正>Introduction When households are faced with the choice of where to live in a city, one of the foremost concerns is the loca-tion’s accessibility to jobs and various other amenities, such as schools, hospitals, and parks[1]. A home in a city is a gateway to urban opportunities, and obviously
2010年05期 v.15 595-603页 [查看摘要][在线阅读][下载 2968K] [下载次数：215 ] |[网刊下载次数：0 ] |[引用频次：15 ] |[阅读次数：0 ] - 张婧;申世飞;杨锐;
<正>Introduction Terrorists now have international networks with terror-ism potentially having catastrophic effects. Worldwide, domestic, and transnational terrorists threaten public safety as they create disorder for political, religious or other reasons. Terrorist events, even a single terrorist
2010年05期 v.15 604-612页 [查看摘要][在线阅读][下载 388K] [下载次数：117 ] |[网刊下载次数：0 ] |[引用频次：2 ] |[阅读次数：0 ] <正>Tsinghua Science and Technology (Tsinghua Sci Technol), a comprehensive academic journal sponsored by Tsinghua University, is published bimonthly. This journal aims at presenting the up-to-date scientific achievements with high creativity and great significance in engineering fields, especially in computer and electronic engineering.
2010年05期 v.15 613页 [查看摘要][在线阅读][下载 824K] [下载次数：9 ] |[网刊下载次数：0 ] |[引用频次：0 ] |[阅读次数：0 ]