全文获取类型
收费全文 | 719篇 |
免费 | 6篇 |
专业分类
电工技术 | 19篇 |
综合类 | 1篇 |
化学工业 | 57篇 |
金属工艺 | 84篇 |
机械仪表 | 28篇 |
建筑科学 | 4篇 |
矿业工程 | 4篇 |
轻工业 | 4篇 |
水利工程 | 5篇 |
石油天然气 | 67篇 |
无线电 | 41篇 |
一般工业技术 | 171篇 |
冶金工业 | 150篇 |
原子能技术 | 52篇 |
自动化技术 | 38篇 |
出版年
2022年 | 8篇 |
2021年 | 10篇 |
2019年 | 16篇 |
2018年 | 29篇 |
2017年 | 32篇 |
2016年 | 41篇 |
2015年 | 10篇 |
2014年 | 30篇 |
2013年 | 34篇 |
2012年 | 30篇 |
2011年 | 31篇 |
2010年 | 36篇 |
2009年 | 21篇 |
2008年 | 22篇 |
2007年 | 20篇 |
2006年 | 12篇 |
2005年 | 11篇 |
2004年 | 5篇 |
2003年 | 11篇 |
2002年 | 5篇 |
2001年 | 11篇 |
1999年 | 7篇 |
1998年 | 10篇 |
1997年 | 8篇 |
1995年 | 9篇 |
1994年 | 5篇 |
1993年 | 7篇 |
1992年 | 7篇 |
1990年 | 15篇 |
1989年 | 7篇 |
1988年 | 6篇 |
1987年 | 11篇 |
1986年 | 15篇 |
1985年 | 13篇 |
1984年 | 14篇 |
1983年 | 10篇 |
1982年 | 12篇 |
1981年 | 11篇 |
1980年 | 12篇 |
1979年 | 8篇 |
1978年 | 9篇 |
1977年 | 9篇 |
1976年 | 8篇 |
1975年 | 9篇 |
1974年 | 9篇 |
1973年 | 6篇 |
1972年 | 9篇 |
1971年 | 6篇 |
1969年 | 6篇 |
1968年 | 6篇 |
排序方式: 共有725条查询结果,搜索用时 15 毫秒
1.
2.
N. N. Belov Yu. A. Biryukov A. T. Roslyak N. T. Yugov S. A. Afanas’eva 《Theoretical Foundations of Chemical Engineering》2005,39(3):307-312
A new circulation pneumatic crusher capable of producing submicron powders of refractory materials is presented. A mathematical model is constructed for the dynamic breaking of ceramic macroparticles. This model allows the basic laws of shock-wave crushing in the circulation pneumatic apparatus to be analyzed.__________Translated from Teoreticheskie Osnovy Khimicheskoi Tekhnologii, Vol. 39, No. 3, 2005, pp. 327–333.Original Russian Text Copyright © 2005 by Belov, Biryukov, Roslyak, Yugov, Afanas’ev. 相似文献
3.
4.
Dentists are often called upon to perform painful procedures on children. This may present a management problem for the practitioner who is unfamiliar with accepted behavioural management techniques or prescribing analgesics for paediatric patients. This article will review techniques that may be used to guide a child patient's behaviour through painful procedures as well as addressing the need for post-operative analgesics in the paediatric population. 相似文献
5.
SV Murashkin SV Efremenko IuV Luzganov VA Belov 《Canadian Metallurgical Quarterly》1996,317(12):21-2, 80
The original decision of permanent introduction of antibacterial means to tissues of brain at gunshot meningoencephalitis is offered. For antibacterial therapy the intra-aortal catheter with diameter of 2,5 mm (through a.femoralis) was introduced. After washing the catheter by solution of crystalloid with heparin the various combinations of preparations in 5% solution of glucose were introduced: cephalosporin--8 g/day; hentamicin and brumacilin--240 mg/day accordingly, amicacin--1500 mg/day. Speed of introduction--20-50 mg/h, total volume--500 ml. The catheter was in aorta not more than 10 days, maximum--14 days. A described technique was applied in Burdenko Main Military Clinical Hospital on 34 wounded in head. At computer tomography of brain of all wounded intracranially the splinters and bullets were revealed, clinically--meningoencephalitis. Foreign bodies have been extracted after cupping of clinical and laboratory signs of meningoencephalitis. The authors consider, that the technique is effective not only at wounds of brain, but also at suppurative meningoencephalitis of other etiology. 相似文献
6.
7.
We presents the results of damage of a carbon steel plate30 mm thick upon its loading by the impact of a steel ball5.55 mm in diameter at a velocity of up to7.4 km/sec. The dimensions of the crater formed and the bending flexure of the spalling layer are in good agreement with the results
obtained upon a less intense loading of the target. One more feature of damage, namely, a crack passing through the target
at the level of the crater bottom, has been revealed for the first time.
Institute of Experimental Physics, Sarov 607200. Translated from Fizika Goreniya i Vzryva, Vol. 33, No. 1, pp. 119–121, January–February,
1997. 相似文献
8.
V. S. Belov I. Ya. Klebanov L. I. Pogosova O. I. Kiyan 《Measurement Techniques》1994,37(10):1180-1182
The construction and results of an investigation of lowresistance measures of electrical resistance (10 su–1), 1 ) for use in dc and ac circuits are described. The measures are used as standard measures of resistance and also as scale conveners in the State special and working standards of ac power.Translated from Izmeritel'naya Tekhnika, No. 10, pp. 52–53, October, 1994. 相似文献
9.
We consider the 2D orthogonal feasibility problem (OPP-2) and the 2D strip packing problem (SPP-2). Given a set of rectangular items, the OPP-2 is to decide whether all items can be orthogonally packed into the given rectangular container; the SPP-2 is to find a packing of all items occupying the minimal height of the given semi-infinite strip. Both OPP-2 and SPP-2 are considered without items rotation. We investigate the known Constraint Programming (CP) approaches for OPP-2, in particular the dichotomy and disjunctive branching strategies and adapt 1D relaxation bounds based on linear programming (LP) into the constraint propagation process of the CP. Using the dichotomic search procedure the developed methods for OPP-2 are transformed for the case of SPP-2. Numerical results demonstrate the efficiency of the proposed strategies and of the combination of CP and LP-based pruning rules. 相似文献
10.
A. V. Solnyshkin I. L. Kislova A. N. Belov A. V. Sysa A. A. Stroganov V. I. Shevjakov M. V. Silibin A. A. Mihalchan A. A. Lysenko 《Semiconductors》2017,51(13):1702-1706
The results of a study of film composites based on polyvinylidene fluoride with carbon nanotubes (CNTs) by dielectric relaxation spectroscopy are presented. For composite samples containing more than 0.5 wt % of nanotubes, nonlinear current–voltage characteristics are obtained. The concentration dependences of the electrical conductivity of the composites are examined and the percolation threshold for the samples under study is determined. It is shown that an insignificant increase in the electrical conductivity of the composites is observed even upon filling with 0.2 wt % of CNTs, whereas the electrical conductivity becomes three orders of magnitude higher upon the introduction of 1 wt% of CNTs and is seven orders of magnitude higher at more than 3 wt %, compared with the unfilled polymer. This confirms that CNTs are promising for the development of electrically conducting composites and film materials on the basis of polyvinylidene fluoride. 相似文献