全文获取类型
收费全文 | 3414篇 |
免费 | 114篇 |
国内免费 | 73篇 |
专业分类
电工技术 | 143篇 |
综合类 | 128篇 |
化学工业 | 454篇 |
金属工艺 | 307篇 |
机械仪表 | 345篇 |
建筑科学 | 147篇 |
矿业工程 | 30篇 |
能源动力 | 183篇 |
轻工业 | 67篇 |
水利工程 | 26篇 |
石油天然气 | 62篇 |
武器工业 | 56篇 |
无线电 | 199篇 |
一般工业技术 | 403篇 |
冶金工业 | 138篇 |
原子能技术 | 89篇 |
自动化技术 | 824篇 |
出版年
2024年 | 1篇 |
2023年 | 34篇 |
2022年 | 39篇 |
2021年 | 52篇 |
2020年 | 65篇 |
2019年 | 52篇 |
2018年 | 58篇 |
2017年 | 94篇 |
2016年 | 109篇 |
2015年 | 102篇 |
2014年 | 159篇 |
2013年 | 147篇 |
2012年 | 145篇 |
2011年 | 281篇 |
2010年 | 167篇 |
2009年 | 223篇 |
2008年 | 188篇 |
2007年 | 186篇 |
2006年 | 193篇 |
2005年 | 171篇 |
2004年 | 142篇 |
2003年 | 144篇 |
2002年 | 108篇 |
2001年 | 82篇 |
2000年 | 92篇 |
1999年 | 77篇 |
1998年 | 72篇 |
1997年 | 69篇 |
1996年 | 62篇 |
1995年 | 39篇 |
1994年 | 31篇 |
1993年 | 32篇 |
1992年 | 35篇 |
1991年 | 28篇 |
1990年 | 29篇 |
1989年 | 27篇 |
1988年 | 10篇 |
1987年 | 5篇 |
1986年 | 6篇 |
1985年 | 6篇 |
1984年 | 9篇 |
1983年 | 11篇 |
1982年 | 3篇 |
1981年 | 4篇 |
1980年 | 3篇 |
1979年 | 5篇 |
1977年 | 2篇 |
1975年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有3601条查询结果,搜索用时 15 毫秒
1.
《International Journal of Hydrogen Energy》2020,45(38):19720-19732
The need to reduce PEMFC systems cost as well as to increase their durability is crucial for their integration in various applications and especially for transport applications. A new simplified architecture of the anode circuit called Alternating Fuel Feeding (AFF) offers to reduce the development costs. Requiring a new stack concept, it combines the simplicity of Dead-End Anode (DEA) with the operation advantages of the hydrogen recirculation. The three architectures (DEA, recirculation and AFF) are compared in terms of performance on a 5-kW test bench in automotive conditions, through a sensitivity analysis. A gain of 17% on the system efficiency is observed when switching from DEA to AFF. Moreover, similar performances are obtained both for AFF and for recirculation after an accurate optimization of the AFF tuning parameters. Based on DoE data, a gain of 25% on the weight of the anodic line has been identified compared to pulsed ejector architecture and 43% with the classic recirculation architecture with blower only (Miraï). 相似文献
2.
Steganography is the science of hiding secret message in an appropriate digital multimedia in such a way that the existence of the embedded message should be invisible to anyone apart from the sender or the intended recipient. This paper presents an irreversible scheme for hiding a secret image in the cover image that is able to improve both the visual quality and the security of the stego-image while still providing a large embedding capacity. This is achieved by a hybrid steganography scheme incorporates Noise Visibility Function (NVF) and an optimal chaotic based encryption scheme. In the embedding process, first to reduce the image distortion and to increase the embedding capacity, the payload of each region of the cover image is determined dynamically according to NVF. NVF analyzes the local image properties to identify the complex areas where more secret bits should be embedded. This ensures to maintain a high visual quality of the stego-image as well as a large embedding capacity. Second, the security of the secret image is brought about by an optimal chaotic based encryption scheme to transform the secret image into an encrypted image. Third, the optimal chaotic based encryption scheme is achieved by using a hybrid optimization of Particle Swarm Optimization (PSO) and Genetic Algorithm (GA) which is allowing us to find an optimal secret key. The optimal secret key is able to encrypt the secret image so as the rate of changes after embedding process be decreased which results in increasing the quality of the stego-image. In the extracting process, the secret image can be extracted from the stego-image losslessly without referring to the original cover image. The experimental results confirm that the proposed scheme not only has the ability to achieve a good trade-off between the payload and the stego-image quality, but also can resist against the statistics and image processing attacks. 相似文献
3.
《Ceramics International》2021,47(22):31168-31179
Cubic, tetragonal, and monoclinic (Bi2O3)x (Nd2O3)y (WO3)z (x + y + z = 1) solid solutions based on the Bi2O3 oxygen ion conductor have been prepared by solid-state reactions in the ternary system Bi2O3–Nd2O3–WO3. The field of monoclinic compounds with a Bi3·24La2W0·76O10.14-type structure has been shown to account for most of the ternary system. Compounds with a cubic fluorite structure exist at the boundary of the monoclinic phase field in two small regions at high (83–91 mol% Bi2O3, δ-phase) and low (20–55 mol% Bi2O3, δ′-phase) Bi concentrations. The cubic samples of the δ-phase retain their structure only during rapid heating and cooling, but annealing in the range of 300–700 °C results in structure degradation to lower symmetry phases. The monoclinic compounds and Bi-poor cubic compounds (δ′-phase) have good thermal stability. The cubic samples of the δ′-phase are hygroscopic. Their bulk conductivity noticeably increases with atmospheric humidity, suggesting that these materials are potential proton conductors. 相似文献
4.
基于重量分析的OBDD变量排序算法 总被引:4,自引:0,他引:4
有序的二叉判决图(OBDD)是布尔表达式的一种有效表示方法,但它的体积对变量排序具有较强的依赖性。本文提出一种电路结构图,并在此基础上定义了原始输入重量和节点重量等参数,并建立了用重量分析来指导的OBDD变量排序算法。由于从考虑变量对输出函数的影响出发与从考虑OBDD节点共享性出发对变量排序的要求不同,本文分别设计了两类算法。实验结果表明,本文对大多数标准电路变量排序的效果都优于国际上的同类算法, 相似文献
5.
Weihong Xu Wei You Yaxiu Liu Bingzhe Bai Hongsheng Fang 《北京科技大学学报(英文版)》2005,12(5):410-415
The quantitative effect of Ni content on continuous cooling transformation (CCT) diagrams of novel air-cooled bainite steels was analyzed using artificial neural network models. The results showed that Ni may retard the high- and medium-temperature transformation and martensite transformation. The results conform to the materials science theories. 相似文献
6.
Timothy Thomasma Kurt Hilbrecht 《International Journal of Flexible Manufacturing Systems》1991,3(3-4):231-250
Good methods are needed to specify, test, and debug material-handling control logic. This article surveys a number of representative methods for defining and describing control algorithms for programmable material-handling equipment used in flexible manufacturing systems. The methods are evaluated with regard to their suitability for communication between people and as bases for interfaces to automatic program generators. It is concluded that no single method is entirely satisfactory. Three methods (position diagrams, function block diagrams, and operation networks) have potential to be combined into an effective hybrid approach that minimizes the need for the user to switch between various conceptual models. 相似文献
7.
We measured the sensitivities of five hot-cathode ionization gauges for ambient laboratory temperatures between 23 and 31 °C. All of the ionization gauges exhibited very similar behavior, and the sensitivity could be adequately modeled with a linear function of temperature. The slopes of the fits were smaller than one would expect due to changes in the calibration chamber number density. The thermal transpiration effect, due to local heating of the gauge structures, can account for this, and a characteristic gauge tube temperature can be inferred from the temperature dependence of the sensitivity. A recent comparison of the high vacuum standards of several National Metrology Institutes (NMIs) was performed over the range of 10−6-10−3 Pa using hot-cathode and spinning rotor gauges as transfer standards. Among the participants, laboratory temperatures varied by as much as 5 °C. It is necessary to know how laboratory temperature affects the sensitivity of the hot-cathode transfer standards (spinning rotor gauges explicitly account for the gas temperature) so that individual laboratory results can be corrected to a common temperature. 相似文献
8.
J.C. Helton J.D. Johnson W.L. Oberkampf C.J. Sallaberry 《Reliability Engineering & System Safety》2006,91(10-11):1414-1434
Three applications of sampling-based sensitivity analysis in conjunction with evidence theory representations for epistemic uncertainty in model inputs are described: (i) an initial exploratory analysis to assess model behavior and provide insights for additional analysis; (ii) a stepwise analysis showing the incremental effects of uncertain variables on complementary cumulative belief functions and complementary cumulative plausibility functions; and (iii) a summary analysis showing a spectrum of variance-based sensitivity analysis results that derive from probability spaces that are consistent with the evidence space under consideration. 相似文献
9.
Carlos Conceio Antnio Luísa N. Hoffbauer 《Reliability Engineering & System Safety》2007,92(10):1353-1362
This article describes a finite element-based formulation for the statistical analysis of the response of stochastic structural composite systems whose material properties are described by random fields. A first-order technique is used to obtain the second-order statistics for the structural response considering means and variances of the displacement and stress fields of plate or shell composite structures. Propagation of uncertainties depends on sensitivities taken as measurement of variation effects. The adjoint variable method is used to obtain the sensitivity matrix. This method is appropriated for composite structures due to the large number of random input parameters. Dominant effects on the stochastic characteristics are studied analyzing the influence of different random parameters. In particular, a study of the anisotropy influence on uncertainties propagation of angle-ply composites is carried out based on the proposed approach. 相似文献
10.
采用建立管芯等效电路模型、灵敏度分析以及统计勘探法对微波单片集成电路进行成品率优化,并编制了软件,加入到GaAsICCAD系统中。应用该软件对X波段低噪声MMIC、超宽带MMIC放大器进行了设计,成品率有较大的提高,电路性能有所改善。 相似文献