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1.
Navid Ehsan Mingyan Liu Roderick J. Ragland 《International Journal of Communication Systems》2003,16(6):513-534
Performance enhancing proxies (PEPs) are widely used to improve the performance of TCP over high delay‐bandwidth product links and links with high error probability. In this paper we analyse the performance of using TCP connection splitting in combination with web caching via traces obtained from a commercial satellite system. We examine the resulting performance gain under different scenarios, including the effect of caching, congestion, random loss and file sizes. We show, via analysing our measurements, that the performance gain from using splitting is highly sensitive to random losses and the number of simultaneous connections, and that such sensitivity is alleviated by caching. On the other hand, the use of a splitting proxy enhances the value of web caching in that cache hits result in much more significant performance improvement over cache misses when TCP splitting is used. We also compare the performance of using different versions of HTTP in such a system. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
2.
Takamichi Iida Roderick Guthrie Nagendra Tripathi 《Metallurgical and Materials Transactions B》2006,37(4):559-564
By combining the modified Stokes-Einstein formula with the authors’ model for the melting-point viscosity, the authors present
a model for accurate predictions of self-diffusivity of liquid metallic elements. The model is expressed in terms of well-known
physical quantities and has been applied to various liquid metallic elements for which experimental data are available. The
results of calculations show that agreement with experimental data is excellent; the uncertainties in the calculations of
the self-diffusivities in various liquid metallic elements are equal to the uncertainties associated with experimental measurements.
Also, the authors propose an expression for the temperature dependence of self-diffusivity in liquid metallic elements in
terms of melting-point temperature. Using the model, self-diffusivity data are predicted for liquid iron, cobalt, nickel,
titanium, aluminum, magnesium, silicon, and so forth. 相似文献
3.
4.
Reversible large electric-field-induced strain caused by reversible orientation switchings in BaTiO3 is modeled using the Landau's theory of phase transition. A triple well free energy function is constructed. Each of its minima is associated with one of the polarization orientations involved. Nonlinear constitu- tive laws accounting for reversible orientation switchings and electrostriction effects are obtained by using thermodynamic equilibrium conditions. Hysteretic dynamics of one-dimensional structures is described by coupled nonlinear differential equations. Double hysteretic loops in the electric and me- chanic fields are both successfully modeled. Giant reversible electrostriction is modeled as a conse-quence of reversible orientation switchings via electro-mechanical couplings. Comparisons with ex-perimental results reported in literatures are presented. 相似文献
5.
Experiments were conducted in a full‐scale physical model of a delta‐shaped, four‐strand tundish to study the effect of flow modifiers on tundish performance. Two different types of flow modifiers were studied; an existing flow‐modifier and a turbulence‐inhibitor. Their effects were quantified by measuring residence times of fluid in the tundish and residual ratios of inclusions. Although the Turbulence‐Inhibitor appeared to be more effective in guiding flows than the flow‐modifier, the latter gave the longer average residence times and smaller residence time differences between the inner and outer nozzles, which resulted in a higher residual ratio of inclusions. 相似文献
6.
Roderick I. L. Guthrie 《Metallurgical and Materials Transactions B》2004,35(3):417-437
Fluid flows are an integral part of many metallurgical processing operations. They affect the viability, effectiveness, and
efficiency of many reactors, be they physical or chemical, in nature. The performance characteristics of blast furnaces, steelmaking
vessels, ladles, tundishes, and the molds of continuous casting machines are all strongly influenced by such flows of fluids.
Similarly, the question of liquid metal quality, and cast microstructures, is bound up with the way fluids have flowed and
interacted. In all these aspects, the evolution in our techniques and abilities to model single- and multiphase flows and
their attendant heat- and mass-transfer processes has contributed significantly to our understanding, and ability, to control
these processes, to design improvements, and to develop new processes. To be ignorant of such matters can doom a processing
operation to the scrap heap of metallurgical failures. This article reviews some of the more important aspects of flows in
metallurgical reactor systems associated with steel and aluminum processing, by way of a series of typical examples.
Roderick I.L. Guthrie is the Director of the McGill Metals Processing Centre (MMPC) and the Macdonald Professor of Metallurgy
in the Department of Mining and Metallurgical Engineering, McGill University (Montreal). Leaving Durham Cathedral School,
as Head Chorister, in 1953, he later graduated from Nottingham High School in 1960, took an honors degree in metallurgy at
the Royal School of Mines, Imperial College, in 1963, and went on to obtain a doctorate in process metallurgy in 1967, under
the guidance of Professors Richardson and Bradshaw of the Nuffield and John Percy Research Groups. Since then, Dr. Guthrie
has carried out pioneering research in process engineering metallurgy, on a multitude of topics related to the processing
of iron and steel, and of light metals. As well as some 350 papers written in collaboration with his many graduate students,
he also wrote the textbooks “Engineering in Process Metallurgy” and “The Properties of Liquid Metals” published by Oxford
University Press, in 1990.
Something of an inventor, Guthrie presently holds some 150 patents on a variety of inventions, one of which is in use, worldwide,
for the detection of inclusions in liquid aluminum (LiMCA). Most recently, an in-situ sensor for the three-dimensional scanning of inclusions in liquid steel has been successfully accomplished, also based on
the electric sensing zone technique, again in close collaboration with industrial colleagues. Dr. Guthrie’s most recent research
interests are concerned with the high-speed, near-net-shape casting of sheet materials via twin-roll, and single belt, casting machines, and the possibility of bulk amorphous sheet materials.
His career of 30 years at McGill University has been interspersed with 20 summers as a full-time research consultant to the
steel and aluminum industries, plus a number of Visiting Professorships at the Universities of Tohoku, NTH, KTH, Carnegie
Mellon, Greenwich, and Guildford. Dr. Guthrie is a Fellow of the Canadian Institute of Mining, a Fellow of the Royal Society
of Canada, a Fellow of the Canadian Academy of Engineering, and a Distinguished Member of the Iron and Steel Society. He has
been the recipient of numerous Best Paper Awards, including two Henry Marion Howe Medals of the ASM, two John Chipman Awards
of the ISS, two Extractive Metallurgy Awards of the TMS, and three Light Metal Awards of TMS and CIM. He has served on the
Board of Directors of the Metallurgical Society of Canadian Institute of Mining, Metals and Petroleum Engineers, being its
President in 1992. 相似文献
7.
8.
Roderick A. MacLeod 《New Review of Information Networking》2013,18(1):153-155
The Internet is no longer ‘new technology’ to many charities, both in the UK and beyond. Some campaigning charities, members of the Association for Progressive Communications, have been using the Internet since the mid‐1980s to co‐ordinate activity internationally. For many international aid and development charities, e‐mail has long been a reliable method of communicating with partner organisations overseas in countries which have poor telecommunications infrastructures. Yet there remains considerable debate amongst UK charities about just what the Internet can offer. Many charities seem to believe that it will indeed offer opportunities and advantages, but that these will not become evident for a period of several years. Others are talcing a less conservative attitude and are deliberately testing the various opportunities they can see. This paper summarises UK charities’ efforts at using the Internet to raise funds. It explains the significance of the Internet to charities, arguing that charities should already have begun to test its use in some ways. It summarises the use of the Internet in the UK, demonstrating that it is a significant medium, used by many different people, that charities can no longer ignore. It lists the various methods of fundraising used by UK charities, and it looks at some of the threats that it represents to charities. 相似文献
9.
Sally Zhao 《缤纷家居》2014,(7):130-135
Extract荷兰Den Bosh的一怕老建筑,最近迎来自己的新生。那是座建于20世纪的双层Loft,在设计师Roderick Vos的改造下,它的空间一半被用于零售展示,一半用于办公思考。它模糊了设计师与顾客、艺术与生活的界限,令每一位到访者都能在幽默而单纯的氛围中,领略双享空间的专业设计精神。 相似文献
10.
Harry Young Janine M Gilbert Shona H Murray Roderick D Ball 《Journal of the science of food and agriculture》1996,71(3):329-336
Volatile flavour compounds produced by Royal Gala apple have been identified by GC-MS. Major components were 2-methylbutyl acetate, butyl acetate, hexyl acetate, butanol, 2-methylbutanol and hexanol. Odour-port evaluation of the components separated by GC indicated that the first four compounds were important contributors to the aroma and flavour. Use of analytical sensory panels revealed that 2-methylbutyl acetate, butanol and hexyl acetate had the greatest causal effect on those aroma and flavour attributes considered important for Royal Gala apples. 相似文献