全文获取类型
收费全文 | 411篇 |
免费 | 13篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 124篇 |
金属工艺 | 24篇 |
机械仪表 | 10篇 |
建筑科学 | 5篇 |
矿业工程 | 1篇 |
能源动力 | 2篇 |
轻工业 | 20篇 |
水利工程 | 5篇 |
石油天然气 | 29篇 |
无线电 | 26篇 |
一般工业技术 | 88篇 |
冶金工业 | 69篇 |
自动化技术 | 19篇 |
出版年
2023年 | 4篇 |
2022年 | 16篇 |
2021年 | 17篇 |
2020年 | 9篇 |
2019年 | 10篇 |
2018年 | 14篇 |
2017年 | 15篇 |
2016年 | 15篇 |
2015年 | 12篇 |
2014年 | 13篇 |
2013年 | 24篇 |
2012年 | 14篇 |
2011年 | 16篇 |
2010年 | 15篇 |
2009年 | 18篇 |
2008年 | 15篇 |
2007年 | 15篇 |
2006年 | 9篇 |
2005年 | 11篇 |
2004年 | 16篇 |
2003年 | 15篇 |
2002年 | 14篇 |
2001年 | 12篇 |
2000年 | 6篇 |
1998年 | 8篇 |
1997年 | 4篇 |
1996年 | 5篇 |
1995年 | 4篇 |
1994年 | 4篇 |
1993年 | 3篇 |
1992年 | 5篇 |
1991年 | 7篇 |
1989年 | 2篇 |
1987年 | 3篇 |
1986年 | 4篇 |
1985年 | 2篇 |
1984年 | 3篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1980年 | 2篇 |
1979年 | 3篇 |
1978年 | 5篇 |
1977年 | 3篇 |
1976年 | 5篇 |
1975年 | 2篇 |
1973年 | 4篇 |
1972年 | 2篇 |
1970年 | 2篇 |
1967年 | 3篇 |
1958年 | 1篇 |
排序方式: 共有424条查询结果,搜索用时 15 毫秒
1.
M. N. Levin A. V. Tatarintsev V. A. Makarenko V. R. Gitlin 《Russian Microelectronics》2006,35(5):329-336
A model is formulated that describes how radiation-induced charge accumulates in the gate oxide of a MOS structure and how it decays through tunneling and thermal emission. The model is used in a numerical analysis of the x-ray or UV adjustment of threshold voltage in MOS-circuit manufacture. The limits of this process technique are evaluated. 相似文献
2.
É. I. Golovko G. N. Makarenko R. F. Voitovich V. B. Fedorus 《Powder Metallurgy and Metal Ceramics》1994,32(11-12):917-920
Boron silicide and compounds based on it containing titanium, chromium, nickel, and yttrium and scandium oxides are studied for their oxidation in air from room temperature to 1300°C. It is shown that chromium boride markedly improves the heat resistance of B4Si over a wide temperature range (700–1300°C) probably as a result chromium-oxide dissolution in borosilicate glass and alteration of its structure. A favorable effect of yttrium and scandium oxides as well of nickel silicide appears at above 100°C as a result of forming complex oxide compounds in the scale. 相似文献
3.
A. I. Ol’shanskii V. I. Ol’shanskii E. F. Makarenko 《Journal of Engineering Physics and Thermophysics》2007,80(4):786-790
A method for calculating the kinetics of drying under the conditions of continuous variation in the Rehbinder number in the
period of decreasing drying rate is considered.
__________
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 80, No. 4, pp. 143–146, July–August, 2007. 相似文献
4.
5.
V. I. Korobko I. N. Malyi L. N. Makarenko V. K. Shashmin L. F. Bulgakova 《Journal of Engineering Physics and Thermophysics》1979,37(5):1289-1293
The parameters of discrete particle motion in axisymmetric turbulent impinging air jets are determined.Notation x, y
coordinates (Fig. 1)
- vx
jet velocity
- Vo
maximum jet velocity
- ro
nozzle radius
-
l
i
length of the initial jet section
- L
spacing between the nozzle and the collision plane
- ¯x
dimensionless coordinate referred to the nozzle radius
- ¯xi
dimensionless length of the initial section referred to the nozzle radius
- d
particle diameter
- 1
jet density
-
particle density
- cx
particle drag coefficient
- v
particle velocity
- v1
axial jet velocity
-
kinematic coefficient of the flow viscosity
- ¯xo
dimensionless coordinate referred to the distance L
- dc
cement particle diameter
- ds
sand particle diameter
- ¯vi
dimensionless velocity of particle insertion into the jet, referred to Vo
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 37, No. 5, pp. 813–817, November, 1979. 相似文献
6.
This Letter addresses image segmentation via a generative model approach. A Bayesian network (BNT) in the space of dyadic wavelet transform coefficients is introduced to model texture images. The model is similar to a Hidden Markov model (HMM), but with non-stationary transitive conditional probability distributions. It is composed of discrete hidden variables and observable Gaussian outputs for wavelet coefficients. In particular, the Gabor wavelet transform is considered. The introduced model is compared with the simplest joint Gaussian probabilistic model for Gabor wavelet coefficients for several textures from the Brodatz album [1]. The comparison is based on cross-validation and includes probabilistic model ensembles instead of single models. In addition, the robustness of the models to cope with additive Gaussian noise is investigated. We further study the feasibility of the introduced generative model for image segmentation in the novelty detection framework [2]. Two examples are considered: (i) sea surface pollution detection from intensity images and (ii) image segmentation of the still images with varying illumination across the scene. 相似文献
7.
A VLSI design of a multiprecision matrix multiplier and polynomial evaluator that addresses the issues of implementation is described. The design consists of a two-dimensional array of bit-serial multiply and accumulate cells, each implemented as an accumulator and a pair of registers. A configuration of N2 cells can perform N-width band-matrix multiplication, N × N full-matrix multiplication, and evaluate N polynomials of N coefficients at N points for two's complement numbers, each in linear time. The cell design allows the precision of the calculations to be arbitrarily increased easily, either linearly in space or time. Using current technology, 32-bit multiplication of 100 × 100 matrices can be performed in an estimated quarter of a millisecond. 相似文献
8.
9.
Experimental results show that exothermic reactions in the heating and melting stages of electrode coating take place when the coating contains more than 35% of the exothermic mixture. Data for the effect of the amount of exothermic mixture in the electrode coating on heating and melting of the electrodes are presented. The thermal balance of melting the electrodes with the exothermic mixture in the coating is calculated. The results show that the temperature of 1273 K at which the efficiency of the exothermic reaction is high is reached at a distance of approximately 1 mm from the electrode tip. It is confirmed that the addition of up to 53.4% of the exothermic mixture to the electrode coating increases the effective efficiency of heating the parent metal (ηm) from 0.715 to 0.815 and of the electrode (ηel) from 0.28 to 0.415. 相似文献
10.
Numerical calculation data on the characteristics of linear and nonlinear fracture mechanics are presented. These characteristics help to predict the surface development of studied cracks before their initiation on the surface of a product. In addition, they provide the specified durability and strength evaluation of important elements of equipment with consideration of the kinetics of the local fracture processes along the contours of differently oriented semielliptical surface cracks with consideration of the local dimension of the stress state and their relative depth. 相似文献