全文获取类型
收费全文 | 2770篇 |
免费 | 54篇 |
国内免费 | 12篇 |
专业分类
电工技术 | 42篇 |
综合类 | 3篇 |
化学工业 | 556篇 |
金属工艺 | 162篇 |
机械仪表 | 70篇 |
建筑科学 | 149篇 |
矿业工程 | 10篇 |
能源动力 | 98篇 |
轻工业 | 225篇 |
水利工程 | 26篇 |
石油天然气 | 62篇 |
武器工业 | 1篇 |
无线电 | 207篇 |
一般工业技术 | 690篇 |
冶金工业 | 205篇 |
原子能技术 | 80篇 |
自动化技术 | 250篇 |
出版年
2021年 | 30篇 |
2020年 | 21篇 |
2019年 | 23篇 |
2018年 | 66篇 |
2017年 | 53篇 |
2016年 | 55篇 |
2015年 | 42篇 |
2014年 | 45篇 |
2013年 | 105篇 |
2012年 | 102篇 |
2011年 | 158篇 |
2010年 | 130篇 |
2009年 | 131篇 |
2008年 | 94篇 |
2007年 | 111篇 |
2006年 | 113篇 |
2005年 | 63篇 |
2004年 | 64篇 |
2003年 | 84篇 |
2002年 | 79篇 |
2001年 | 90篇 |
2000年 | 61篇 |
1999年 | 51篇 |
1998年 | 94篇 |
1997年 | 88篇 |
1996年 | 59篇 |
1995年 | 48篇 |
1994年 | 50篇 |
1993年 | 54篇 |
1992年 | 38篇 |
1991年 | 41篇 |
1990年 | 30篇 |
1989年 | 35篇 |
1988年 | 34篇 |
1987年 | 38篇 |
1986年 | 44篇 |
1985年 | 31篇 |
1984年 | 35篇 |
1983年 | 14篇 |
1982年 | 19篇 |
1981年 | 26篇 |
1980年 | 15篇 |
1979年 | 21篇 |
1978年 | 14篇 |
1977年 | 21篇 |
1976年 | 32篇 |
1975年 | 14篇 |
1974年 | 18篇 |
1973年 | 16篇 |
1971年 | 14篇 |
排序方式: 共有2836条查询结果,搜索用时 15 毫秒
51.
针对多频连续波雷达航迹起始问题,提出一种引入径向速度量测的航迹起始新方法.首先从理论上分析航迹起始波门的设计方法;然后详细阐述了引入径向速度量测后的航迹起始算法;最后通过Monte Carlo仿真验证了该算法的有效性,并结合多频连续波体制雷达的测距特点,分固定测距误差与变测距误差两种情况比较了不同波门设计对多频连续波雷达航迹起始效果的影响. 相似文献
52.
聚丙烯装置的关键设备PK301频繁故障停车,通过分析各类故障发生原因,着重解决气相带粉问题和分液罐除沫器结构,通过运行考核,机组实现了长周期运转实现长周期运行14个月不大修. 相似文献
53.
The problem of computing the chromatic number of a P
5-free graph (a graph which contains no path on 5 vertices as an induced subgraph) is known to be NP-hard. However, we show
that for every fixed integer k, there exists a polynomial-time algorithm determining whether or not a P
5-free graph admits a k-coloring, and finding one, if it does. 相似文献
54.
I.G. GeorgoudasG.Ch. Sirakoulis E.M. ScordilisI. Andreadis 《Advances in Engineering Software》2011,42(9):623-633
A two-dimensional (2-D) cellular automata (CA) dynamic system constituted of cells-charges has been proposed for the simulation of the earthquake process. In this paper, the study is focused on the optimal parameterisation of the model introducing the use of genetic algorithm (GA). The optimisation of the CA model parameterisation, by applying a standard GA, extends its ability to study various hypotheses concerning the seismicity of the region under consideration. The GA evolves an initially random population of candidate solutions of model parameters, such that in time appropriate solutions to emerge. The quality criterion is realised by taking into account the extent that the simulation results match the Gutenberg-Richter (GR) law derived from recorded data of the area under test. The simulation results presented here regard regions of Greece with different seismic and geophysical characteristics. The results found are in good quantitative and qualitative agreement with the GR scaling relations. 相似文献
55.
Modified Runge-Kutta (mRK) methods can have interesting properties as their coefficients may depend on the step length. By a simple perturbation of very few coefficients we may produce various function-fitted methods and avoid the overload of evaluating all the coefficients in every step. It is known that, for Runge-Kutta methods, each order condition corresponds to a rooted tree. When we expand this theory to the case of mRK methods, some of the rooted trees produce additional trees, called mRK rooted trees, and so additional conditions of order. In this work we present the relative theory including a theorem for the generating function of these additional mRK trees and explain the procedure to determine the extra algebraic equations of condition generated for a major subcategory of these methods. Moreover, efficient symbolic codes are provided for the enumeration of the trees and the generation of the additional order conditions. Finally, phase-lag and phase-fitted properties are analyzed for this case and specific phase-fitted pairs of orders 8(6) and 6(5) are presented and tested. 相似文献
56.
E. Rank S. Kollmannsberger Ch. Sorger A. Düster 《Computer Methods in Applied Mechanics and Engineering》2011,200(45-46):3200-3209
This article presents a generalization of the recently proposed Finite Cell Method to thin-walled structures. This approach uses a combination of well known Fictitious Domain Methods with high order hierarchical Ansatz spaces known from the p-version of the Finite Element Method. Whereas the original concept embeds a three-dimensional structure in a simple domain being meshed into a grid of cube shaped cells, the extension presented in this paper applies the fictitious domain approach to a two-dimensional master domain defined in the parameter plane of the geometric model. Implementation details are discussed and numerical benchmark problems show the high accuracy and computational efficiency of the new approach. It is also remarked, that the present approach can easily be carried over to isogeometric analysis, opening an attractive possibility to simulate trimmed NURBS-surfaces. 相似文献
57.
Fracture analysis of plane piezoelectric/piezomagnetic multiphase composites under transient loading
R. Rojas-Díaz F. García-Sánchez A. Sáez E. Rodríguez-Mayorga Ch. Zhang 《Computer Methods in Applied Mechanics and Engineering》2011,200(45-46):2931-2942
The transient response of cracked composite materials made of piezoelectric and piezomagnetic phases, when subjected to in-plane magneto-electro-mechanical dynamic loads, is addressed in this paper by means of a mixed boundary element method (BEM) approach. Both the displacement and traction boundary integral equations (BIEs) are used to develop a single-domain formulation. The convolution integrals arising in the time-domain BEM are numerically computed by Lubich’s quadrature, which determines the integration weights from the Laplace transformed fundamental solution and a linear multistep method. The required Laplace-domain fundamental solution is derived by means of the Radon transform in the form of line integrals over a unit circumference. The singular and hypersingular BIEs are numerically evaluated in a precise and efficient manner by a regularization procedure based on a simple change of variable, as previously proposed by the authors for statics. Discontinuous quarter-point elements are used to properly capture the behavior of the extended crack opening displacements (ECOD) around the crack-tip and directly evaluate the field intensity factors (stress, electric displacement and magnetic induction intensity factors) from the computed nodal data. Numerical results are obtained to validate the formulation and illustrate its capabilities. The effect of the combined application of electric, magnetic and mechanical loads on the dynamic field intensity factors is analyzed in detail for several crack configurations under impact loading. 相似文献
58.
L. E. Evseeva V. Ch. Kruplevich A. I. Lesnikovich G. V. Printsev V. R. Sobol' S. A. Tanaeva 《Journal of Engineering Physics and Thermophysics》1991,61(3):1113-1116
Measurements have been made on the thermal conductivity and specific heat of the powder product from quenching in nitrogen applied to the gas-liquid flame formed by the combustion of a tetrazole-sodium tetrazolate mixture in weight proportion 31. The thermal conductivity on the whole is a nonmonotone function of temperature in the range 100–450 K and has some local turning points associated with the multicomponent structure and the phase transitions associated with chemical and structural transformations.Translated from Inzhenrno-fizicheskii Zhurnal, Vol. 61, No. 3, pp. 422–426, September, 1991. 相似文献
59.
Bovine immunoglobulins (IgG1 type) have been isolated from colostral whey. Hydrolysis by pronase, trypsin and (or) chymotrypsin yield several glycopeptides structural studies of which lead to the following results. 1. IgG1 colostral immunoglobulins possess two glycan moieties which are linked to the peptidic chain by an N-(beta-aspartyl)-N-acetylglucosaminylamine bound. 2. The peptidic sequence around the linkage region has been determined by classical methods and is as follows: Thr-Lys-Pro-Arg-Glu-Glu-Gln-Phe-Asn(Glycan)-Ser-Thr-Tyr-Arg. 3. The following procedures: partial acidic hydrolysis, periodic oxidation, hydrazinolysis-nitrous deamination, methylation and use of specific glycosidases allowed us to determine the structure of the glycan moieties which fit with the general following scheme: (see article) Thus they could be related to the general glycan structure so-called of "N-acetyllactosamine type" because they possess the pentasaccharidic core common to numerous glycoproteins Man alpha 1 leads to [Man alpha 1 leads to 6] Man beta 1 leads to 4 GlcNAc beta 1 leads to 4 GlcNAc beta 1 leads to Asn on which are conjugated 2 N-acetyllactosamine residues. Besides they present a microheterogeneity which is due to the varying number of additional N-acetylneuraminic acid and fucose residues. 4. These structures are compared to various immunoglobulin structures proposed by others: bovine serum IgG and human serum IgG, IgE and IgA. 相似文献
60.
A meshless method based on the local Petrov-Galerkin approach is proposed for the solution of quasi-static and transient dynamic
problems in two-dimensional (2-D) nonhomogeneous linear viscoelastic media. A unit step function is used as the test functions
in the local weak form. It is leading to local boundary integral equations (LBIEs) involving only a domain-integral in the
case of transient dynamic problems. The correspondence principle is applied to such nonhomogeneous linear viscoelastic solids
where relaxation moduli are separable in space and time variables. Then, the LBIEs are formulated for the Laplace-transformed
viscoelastic problem. The analyzed domain is covered by small subdomains with a simple geometry such as circles in 2-D problems.
The moving least squares (MLS) method is used for approximation of physical quantities in LBIEs. 相似文献