首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   120篇
  免费   3篇
电工技术   4篇
化学工业   19篇
金属工艺   1篇
机械仪表   2篇
建筑科学   12篇
能源动力   2篇
轻工业   4篇
石油天然气   4篇
无线电   9篇
一般工业技术   28篇
冶金工业   16篇
自动化技术   22篇
  2024年   1篇
  2023年   1篇
  2022年   4篇
  2021年   3篇
  2020年   1篇
  2019年   1篇
  2018年   6篇
  2017年   4篇
  2016年   1篇
  2015年   2篇
  2014年   1篇
  2013年   6篇
  2012年   5篇
  2011年   5篇
  2010年   1篇
  2009年   2篇
  2008年   5篇
  2006年   3篇
  2005年   2篇
  2004年   3篇
  2003年   4篇
  2002年   1篇
  2001年   3篇
  2000年   5篇
  1999年   2篇
  1998年   1篇
  1997年   3篇
  1996年   3篇
  1995年   6篇
  1994年   7篇
  1993年   2篇
  1992年   4篇
  1991年   7篇
  1990年   1篇
  1988年   2篇
  1985年   1篇
  1984年   2篇
  1982年   1篇
  1981年   2篇
  1980年   2篇
  1979年   2篇
  1978年   1篇
  1976年   4篇
排序方式: 共有123条查询结果,搜索用时 15 毫秒
111.
Thick films of Bi-Sr-Ca-Cu-O were deposited on (100) MgO substrates by screen-printing technique with the starting composition 1112. To attain the superconducting state, the films were subjected to two-step heat-treatment. R-T and XRD have been studied for films annealed at different durations of the second step. InitiallyT c (R=0) increased from 77 to 103 K as the annealing duration was increased after whichT c decreased. Kinetics of the growth of highT c phase is discussed in the light of our results.  相似文献   
112.
113.
P.T. John  D.K. Suri  K.C. Nagpal 《Carbon》1979,17(6):491-493
It is shown that one can predict the adsorption of a binary gas mixture from the adsorption of individual component gases by means of John's isotherm. It is found that the slope and intercept of John's adsorption isotherm for binary mixture is equal to mean of the slopes and intercepts of individual adsorption isotherms. The relation given by Lewis et al. may be used to prove the validity of the above method.  相似文献   
114.
A modified t-method known as tJ method, capable of finding mesopore surface area in absence or presence of micropores in which adsorption may be pressure dependent or pressure independent is described by the application of John's adsorption isotherm equation.  相似文献   
115.
K.C. Nagpal  P.T. John 《Carbon》1978,16(5):359-361
Complete identity of adsorption isotherms of Dubinin and John is proved by showing that the slope D of Dubinin equation is equal to slope D0 of Dubinin type equation derived from John's isotherm and also showing that the terms involved in D and D0 are fundamentally the same. It is shown that the degree of microporosity is proportional to n the slope of John's isotherm. B the measure of microporosity in Dubinin equation is inversely proportional to n. The advantages of John's isotherm are also given.  相似文献   
116.
With the perpetual depletion of non-renewable sources of energy, the need of the hour is to look for alternative greener sources of energy. Hydrogen has emerged as an efficient, safe and versatile energy carrier. The storage and transportation of hydrogen is a problem that needs to be addressed in order to use hydrogen for practical applications. This review focuses on intermediate hydrogen storage which provides a balance between physical and chemical hydrogen storage. An optimum hydrogen adsorption energy at near ambient temperatures (0.2–0.3 eV), reversible hydrogen storage and fast adsorption and desorption kinetics are the advantages offered by intermediate hydrogen storage materials. The review discusses the recent synthetic and computational approaches for storage of hydrogen in 2D materials and inorganic nanostructured compounds.  相似文献   
117.
A recursive algorithm suitable for microprocessor-based power system relaying and measurement applications is described. The algorithm is designed using the least error squares (LES) curve fitting technique. The mathematical background for the nonrecursive least error squares algorithm is extended to form a recursive algorithm. A method for including decaying DC and harmonic frequencies in the algorithm is described. Sample studies are presented to demonstrate the performance of the developed algorithm. The recursive LES (RLES) algorithm is shown to be computationally efficient and does not require the time constant of decaying DC and statistical information concerning the signal. It is shown that a 12-RLES algorithm can be used for implementing transformer differential protection  相似文献   
118.
The liquid-liquid equilibria for toluene-n-heptane-N-methyl pyrrolidone containing 10 and 20% water at 298 and 313 K, and of benzene-n-heptane with N-methyl pyrrolidone-ethylene glycol and γ-butyrolactone-ethylene glycol, which is a new solvent combination, have been determined at 303 K.  相似文献   
119.
It has been well recognized that dietary proteins provide a rich source of biologically active peptides. Today, milk proteins are considered the most important source of bioactive peptides and an increasing number of bioactive peptides have been identified in milk protein hydrolysates and fermented dairy products. Bioactive peptides derived from milk proteins offer a promising approach for the promotion of health by means of a tailored diet and provide interesting opportunities to the dairy industry for expansion of its field of operation. The potential health benefits of milk protein-derived peptides have been a subject of growing commercial interest in the context of health-promoting functional foods. Hence, these peptides are being incorporated in the form of ingredients in functional and novel foods, dietary supplements and even pharmaceuticals with the purpose of delivering specific health benefits.  相似文献   
120.
Vertical deflections and load transfer among columns of R.C frames depend on the percentage of reinforcement in columns and stiffness of beams. No systematic studies are available in the literature on the effect of these parameters. Such systematic studies are reported in this paper. The beam stiffness is expressed in terms of a non‐dimensional parameter, designated as stiffness factor, which is the ratio of shear stiffness of beams to axial stiffness of columns. It is shown that depending on stiffness factor and column reinforcement, a column may receive the load from the adjacent columns or transfer the load to the adjacent columns, or may receive the load from one of the adjacent columns and at the same time transfer the load to the other adjacent column. Further, the effect of the creep and shrinkage on column axial forces can be of design significance in the lower and middle portions of buildings. The effect becomes greater with the increase in stiffness factor and difference in percentage reinforcement of the adjacent columns. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号