全文获取类型
收费全文 | 902篇 |
免费 | 49篇 |
专业分类
电工技术 | 8篇 |
综合类 | 2篇 |
化学工业 | 224篇 |
金属工艺 | 35篇 |
机械仪表 | 12篇 |
建筑科学 | 64篇 |
矿业工程 | 2篇 |
能源动力 | 34篇 |
轻工业 | 44篇 |
水利工程 | 3篇 |
无线电 | 58篇 |
一般工业技术 | 183篇 |
冶金工业 | 108篇 |
原子能技术 | 7篇 |
自动化技术 | 167篇 |
出版年
2023年 | 16篇 |
2022年 | 21篇 |
2021年 | 23篇 |
2020年 | 15篇 |
2019年 | 14篇 |
2018年 | 13篇 |
2017年 | 16篇 |
2016年 | 37篇 |
2015年 | 22篇 |
2014年 | 38篇 |
2013年 | 37篇 |
2012年 | 39篇 |
2011年 | 54篇 |
2010年 | 54篇 |
2009年 | 50篇 |
2008年 | 49篇 |
2007年 | 52篇 |
2006年 | 17篇 |
2005年 | 29篇 |
2004年 | 27篇 |
2003年 | 17篇 |
2002年 | 10篇 |
2001年 | 13篇 |
2000年 | 16篇 |
1999年 | 15篇 |
1998年 | 32篇 |
1997年 | 18篇 |
1996年 | 17篇 |
1995年 | 9篇 |
1994年 | 12篇 |
1993年 | 9篇 |
1992年 | 12篇 |
1991年 | 9篇 |
1990年 | 5篇 |
1989年 | 7篇 |
1988年 | 9篇 |
1987年 | 9篇 |
1986年 | 10篇 |
1985年 | 5篇 |
1983年 | 4篇 |
1982年 | 5篇 |
1981年 | 9篇 |
1978年 | 10篇 |
1977年 | 7篇 |
1976年 | 8篇 |
1971年 | 5篇 |
1970年 | 6篇 |
1967年 | 3篇 |
1966年 | 6篇 |
1935年 | 3篇 |
排序方式: 共有951条查询结果,搜索用时 156 毫秒
31.
Back Cover: Mapping the Interactions of Selective Biochemical Probes of Antibody Conformation by Hydrogen–Deuterium Exchange Mass Spectrometry (ChemBioChem 11/2017)
下载免费PDF全文
![点击此处可从《Chembiochem : a European journal of chemical biology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
32.
33.
Nikolay Kardjilov Ingo Manke Robin Woracek André Hilger John Banhart 《Materials Today》2018,21(6):652-672
Imaging techniques based on neutron beams are rapidly developing and have become versatile non-destructive analyzing tools in many research fields. Due to their intrinsic properties, neutrons differ strongly from electrons, protons or X-rays in terms of their interaction with matter: they penetrate deeply into most common metallic materials while they have a high sensitivity to light elements such as hydrogen, hydrogenous substances, or lithium. This makes neutrons perfectly suited probes for research on materials that are used for energy storage and conversion, e.g., batteries, hydrogen storage, fuel cells, etc. Moreover, their wave properties can be exploited to perform diffraction, phase-contrast and dark-field imaging experiments. Their magnetic moment allows for resolving magnetic properties in bulk samples. This review will focus on recent applications of neutron imaging techniques in both materials research and fundamental science illustrated by examples selected from different areas. 相似文献
34.
Volkan Kumtepeli Yulong Zhao Maik Naumann Anshuman Tripathi Youyi Wang Andreas Jossen Holger Hesse 《国际能源研究杂志》2019,43(9):4127-4147
The rapid increase of renewable energy sources made coordinated control of the distributed and intermittent generation units a more demanded task. Matching demand and supply is particularly challenging in islanded microgrids. In this study, we have demonstrated a mixed‐integer quadratic programming (MIQP) method to achieve efficient use of sources within an islanded microgrid. A unique objective function involving fuel consumption of diesel generator, degradation in a lithium‐ion battery energy storage system, carbon emissions, load shifting, and curtailment of the renewable sources is constructed, and an optimal operating point is pursued using the MIQP approach. A systematic and extensive methodology for building the objective function is given in a sequential and explicit manner with an emphasis on a novel model‐based battery aging formulation. Performance of the designed system and a sensitivity analysis of resulting battery dispatch, diesel generator usage, and storage aging against a range of optimization parameters are presented by considering real‐world specifications of the Semakau Island, an island in the vicinity of Singapore. 相似文献
35.
36.
37.
In the field of forging the production processes are subject to extreme influences. This leads to failures in process steps or part qualities. To guarantee a high product quality and process stability it is necessary to measure and evaluate the process parameters during the manufacturing process. Online monitoring systems are especially required to avoid high scrap costs. In this paper an innovative concept for monitoring the spray field of massive forming processes is presented. So far a practical method to monitor the lubrication process for purpose of quality assurance and process fault diagnosis in forging processes does not exist. With the sensor system developed at the Institute of Forming Technology and Machines a qualitative and quantitative assessment of spray fields used for cooling and lubrication of forging die processes is possible. The sensor system operates on the basis of current flow measurements and is able to realize a local determination of the spray field. Furthermore an artificial neuronal network (ANN) was programmed to collect, evaluate and analyze the signal of the sensors automatically. Such networks have already been proven to detect and analyze process failures. Especially in the analyses of systems depending on many parameters and their interactions with each other ANN offer the advantage to deliver the desired statements on the basis of suitable test series. 相似文献
38.
The vision of Organic Computing addresses challenges that arise in the design of future information systems that are comprised of numerous, heterogeneous, resource-constrained and error-prone components. The notion organic highlights the idea that, in order to be manageable, such systems should exhibit self-organization, self-adaptation and self-healing characteristics similar to those of biological systems. In recent years, the principles underlying these characteristics are increasingly being investigated from the perspective of complex systems science, particularly using the conceptual framework of statistical physics and statistical mechanics. In this article, we review some of the interesting relations between statistical physics and networked systems and discuss applications in the engineering of organic overlay networks with predictable macroscopic properties. 相似文献
39.
Ian Holt Ingo Gestmann Andrew C. Wright 《Materials science & engineering. C, Materials for biological applications》2013,33(7):4274-4279
The development of scaffolds and templates is an essential aspect of tissue engineering. We show that thick (> 0.5 mm) vertically aligned carbon nanotube films, made by chemical vapour deposition, can be used as biocompatible substrates for the directional alignment of mouse muscle cells where the cells grow on the exposed sides of the films. Ultra high resolution scanning electron microscopy reveals that the films themselves consist mostly of small diameter (10 nm) multi-wall carbon nanotubes of wavy morphology with some single wall carbon nanotubes. Our findings show that for this alignment to occur the nanotubes must be in pristine condition. Mechanical wiping of the films to create directional alignment is detrimental to directional bioactivity. Larger areas for study have been formed from a composite of multiply stacked narrow strips of nanotubes wipe-transferred onto elastomer supports. These composite substrates appear to show a useful degree of alignment of the cells. 相似文献
40.
Gabriel Maria Ingo Cristina Riccucci Gianni Chiozzini 《Journal of the American Ceramic Society》2001,84(8):1839-1843
The origin of gas-porosity in gold-based alloys produced via lost-wax casting in CaSO4 -bonded investment has been identified using a combination of microanalytical and thermal techniques. The occurrence of gas-porosity is related to the thermal decomposition of CaSO4 , which, with SiO2 , constitutes the investment material and decomposes at a temperature very close to the casting temperature of some typical gold alloys used for jewelry production. The thermal reaction generates SO2 , leading to gas-porosity and, therefore, to defective products. Furthermore, the results show the detrimental effect of thermal decomposition caused by the presence of ZnO, Cu2 O, CuO, NiO, and Ag2 O formed on the surface of the gold-based alloy during air melting or casting. Therefore, the solid-state thermal decomposition of CaSO4 in the presence of other ceramic oxides has been investigated and found to be related to their surface acid–base properties, measured as isoelectric points on the solid surface. 相似文献