全文获取类型
收费全文 | 496篇 |
免费 | 6篇 |
专业分类
电工技术 | 5篇 |
综合类 | 2篇 |
化学工业 | 95篇 |
金属工艺 | 58篇 |
机械仪表 | 23篇 |
建筑科学 | 8篇 |
矿业工程 | 12篇 |
能源动力 | 5篇 |
轻工业 | 8篇 |
水利工程 | 8篇 |
石油天然气 | 15篇 |
无线电 | 30篇 |
一般工业技术 | 88篇 |
冶金工业 | 101篇 |
原子能技术 | 24篇 |
自动化技术 | 20篇 |
出版年
2022年 | 7篇 |
2021年 | 8篇 |
2019年 | 7篇 |
2018年 | 16篇 |
2017年 | 12篇 |
2016年 | 11篇 |
2015年 | 4篇 |
2014年 | 13篇 |
2013年 | 23篇 |
2012年 | 21篇 |
2011年 | 13篇 |
2010年 | 20篇 |
2009年 | 27篇 |
2008年 | 20篇 |
2007年 | 21篇 |
2006年 | 13篇 |
2005年 | 13篇 |
2004年 | 10篇 |
2003年 | 4篇 |
2002年 | 8篇 |
2001年 | 5篇 |
1998年 | 12篇 |
1997年 | 9篇 |
1996年 | 8篇 |
1995年 | 7篇 |
1991年 | 3篇 |
1990年 | 4篇 |
1989年 | 6篇 |
1987年 | 5篇 |
1985年 | 4篇 |
1984年 | 4篇 |
1983年 | 7篇 |
1982年 | 10篇 |
1981年 | 6篇 |
1980年 | 8篇 |
1979年 | 5篇 |
1978年 | 19篇 |
1977年 | 6篇 |
1976年 | 11篇 |
1975年 | 14篇 |
1974年 | 9篇 |
1973年 | 6篇 |
1972年 | 6篇 |
1971年 | 8篇 |
1970年 | 3篇 |
1969年 | 7篇 |
1968年 | 3篇 |
1967年 | 4篇 |
1966年 | 5篇 |
1960年 | 3篇 |
排序方式: 共有502条查询结果,搜索用时 15 毫秒
1.
The Chelyabinsk Metallurgical Combine has periodically used Kachkanar agglomerate to make conversion pig iron since 1972.
Use of this material reached a peak in 1998, when it comprised an average of 27.1% of the charge. In some months, the amount
of this material charged into the furnace reached highs of 45.6 and 74.1% on certain furnaces. The coolers on the iron notches
of furnaces 4 and 5 burned during that year, the quality of the smelting products and the condition of the ladles rapidly
deteriorated, and the smelting rate declined. No Kachkanar agglomerate was used in 2000–2001, but it was again added to the
charge in February 2002. The amount used was smaller than previously, averaging 10.7% for the shop as a whole. It was determined
that using a charge with 15% Kachkanar agglomerate has both positive and negative consequences.
N. N. Gorshkov, A. V. Denisov, and V. Kh. Barinov also participated in this study.
__________
Translated from Metallurg, No. 3, pp. 43–45, March, 2006. 相似文献
2.
An original operation is proposed for localization of the diverticulum in the descending portion of the duodenum which excludes traumas of the pancreas. Clinical observations are described. 相似文献
3.
Yu. S. Gorbunov A. G. Ageev R. V. Vasil’eva B. M. Korol’kov 《Power Technology and Engineering (formerly Hydrotechnical Construction)》2007,41(3):166-170
A system for the direct measurement of steam flow in steam lines after a steam generator, which utilizes a special design
of pneumometric tubes and a computing unit that accounts for variation in steam pressure, has been developed to improve the
quality of water-level regulation in the steam generators of VVéR-1000 power-generating units in the stationary and transitional
modes. The advantage of the pneumometric tubes consists in their structural simplicity, high erosion resistance, and absence
of irrevocable losses during measurement of steam flow. A similar measurement system is used at foreign NPP. The measurement
system in question has been placed in experimental service at the No. 3 unit of the Balakovo NPP, and has demonstrated its
worthiness. This measurement system can also be used to determine steam flow in the steam lines of NPP units with VVéR-1000
and VVéR-440 reactors, and PBMK-1000 power-generating units.
__________
Translated from élektricheskie Stantsii, No. 3, March 2007, pp. 23–26. 相似文献
4.
5.
A. Ya. Fridman E. M. Morozova A. Yu. Tsivadze N. P. Sokolova I. I. Bardyshev A. M. Gorbunov O. P. Shapokhina 《Protection of Metals》2007,43(5):454-458
With the aim of classifying PVC materials in which surface layers are converted into interpenetrated network cyclam nanofilms
among polymer-polymer systems, comparative studies of their properties were carried out with consideration for the specific
conditions for the preparation of the material. The density and structures of near-surface layers, the bulk ratio of the ordered
and disordered forms, the dynamics of swelling in water, and the effective partial volume occupied by water molecules were
studied for PVC plates prior to and after hydrothermal treatment. The conversion of the surface layers changes the structural
self-organization of PVC: the polymer structure becomes more compact and ordered both in the area adjacent to the nanofilm
and in the polymer bulk, which is characteristic of systems of the type “hard coating on soft substrate”.
Original Russian Text ? A.Ya. Fridman, E.M. Morozova, A.Yu. Tsivadze, N.P. Sokolova, I.I. Bardyshev, A.M. Gorbunov, O.P. Shapokhina,
2007, published in Zashchita Metallov, 2007, Vol. 43, No. 5, pp. 498–502. 相似文献
6.
L. A. Babkina M. I. Prokopenko V. L. Zinchenko N. A. Stepanyuk V. V. Topchii A. D. Gorbunov L. N. Alekhina 《Refractories and Industrial Ceramics》1996,37(1-2):27-28
Materials proposed for the production of a high-alumina mortar are investigated, namely, waste of melting of secondary aluminum, polishing powder of normal electrocorundum, and sintered corundum. A technology for the production of high-alumina mortars of three compositions has been developed for these materials. An experimental industrial batch of mortar composed of ShKN chamotte, polishing powder of normal electrocorundum, and DN2 clay has been manufactured and tested with a positive result. Production of the mortar has been introduced in the Belokamensk Refractory Plant.Translated from Ogneupory, No. 1, pp. 27 – 28, January, 1996. 相似文献
7.
8.
Mykola Saporoschenko Helena Twardowska Gerald V. Smith Conrad C. Hinckley Richard H. Shiley W.Arthur White 《Fuel》1980,59(11):767-771
Mossbauer spectra of iron species in the following illites were studied: Grundite, Fithian, Minerva, and New Albany. Spectra of samples of Fithian illite heated at temperatures of 225, 700, and 1000 °C were also obtained. Analyses of these spectra provide Mössbauer parameter values of iron species in the illites and heat-transformed illite for comparison with similar species found in coals containing illites and in coal process residues derived from them. The illites contain both ferric and ferrous species. Mössbauer parameters for one of the ferric species, designated M(2), are virtually the same as those of pyrite. The two species are therefore difficult to distinguish from one another. Values of the concentration of pyrite in coals and shales may be inflated if the pyrite concentration is measured by Mössbauer spectroscopy. Mössbauer spectra of the heat-treated illite samples reveal changes in iron distribution, principally at the 700 and 1000 °C levels, where there are found three and six different iron species respectively. These changes are accompanied by reduction of ferric to ferrous iron. This process should be integrated into any assessment of the iron chemistry which accompanies coal-conversion processes. 相似文献
9.
A theory of chromatography of eight-shaped, trefoil-shaped and daisy-like polymers is developed. For a model of an ideal chain in a slit-like pore exact equations and a number of approximate formulae for the distribution coefficient K of these polymers are derived. All modes of chromatography of complex macrocycles of arbitrary molar mass in both narrow and wide pores are covered by the theory. It is shown that complex macrocycles always elute after linear polymers and rings of the same contour length. The effective chromatographic radius of eight-shaped and daisy-like macromolecules, which determines retention in size-exclusion chromatography are calculated. The increase in the retention with molar mass is predicted for all types of macrocycles at the critical interaction condition. Non-monotonous molar mass dependences of K are found at pre-critical interaction. We simulate separation of complex cyclic polymers from linear and ring precursors, discuss possibilities to separate symmetric and asymmetric eights, and speculates on the use of chromatography for separating knotted and unknotted polymer rings. According to the theory, the chromatography under the critical and pre-critical interaction conditions is expected to be especially efficient in these and similar problems. Boundary conditions for the theory and its applicability to real systems are discussed. 相似文献
10.
针对证据理论应用中基本概率赋值(BPA)生成模型难以确定问题,该文提出一种基于云模型的BPA生成方法。首先基于样本属性的正态云模型构建单子集命题的BPA模型函数,并将复合子集的模型函数表示为高斯函数乘积融合。其次提出一种根据测试样本动态度量属性权重的方法来兼顾信息源的可靠性。最后,用属性权重修正模型函数输出的结果得到BPA。鸢尾花等数据集分类识别实验表明,该方法识别准确性高,且适用于样本较少的情况。 相似文献