全文获取类型
收费全文 | 1687篇 |
免费 | 65篇 |
专业分类
电工技术 | 16篇 |
综合类 | 3篇 |
化学工业 | 552篇 |
金属工艺 | 27篇 |
机械仪表 | 27篇 |
建筑科学 | 137篇 |
矿业工程 | 5篇 |
能源动力 | 40篇 |
轻工业 | 182篇 |
水利工程 | 5篇 |
石油天然气 | 1篇 |
无线电 | 94篇 |
一般工业技术 | 329篇 |
冶金工业 | 216篇 |
原子能技术 | 15篇 |
自动化技术 | 103篇 |
出版年
2021年 | 22篇 |
2019年 | 21篇 |
2018年 | 23篇 |
2017年 | 28篇 |
2016年 | 36篇 |
2015年 | 39篇 |
2014年 | 42篇 |
2013年 | 68篇 |
2012年 | 62篇 |
2011年 | 76篇 |
2010年 | 45篇 |
2009年 | 60篇 |
2008年 | 63篇 |
2007年 | 54篇 |
2006年 | 50篇 |
2005年 | 48篇 |
2004年 | 53篇 |
2003年 | 34篇 |
2002年 | 36篇 |
2001年 | 30篇 |
2000年 | 28篇 |
1999年 | 19篇 |
1998年 | 30篇 |
1997年 | 31篇 |
1996年 | 37篇 |
1995年 | 26篇 |
1994年 | 21篇 |
1993年 | 34篇 |
1992年 | 19篇 |
1991年 | 28篇 |
1990年 | 21篇 |
1989年 | 27篇 |
1988年 | 16篇 |
1986年 | 15篇 |
1985年 | 31篇 |
1984年 | 34篇 |
1983年 | 28篇 |
1982年 | 27篇 |
1981年 | 31篇 |
1980年 | 28篇 |
1979年 | 22篇 |
1978年 | 27篇 |
1976年 | 19篇 |
1975年 | 18篇 |
1974年 | 28篇 |
1973年 | 20篇 |
1972年 | 17篇 |
1971年 | 15篇 |
1970年 | 16篇 |
1969年 | 17篇 |
排序方式: 共有1752条查询结果,搜索用时 15 毫秒
71.
The selectivity of metal oxide gas sensors (MOG) can be improved significantly by forming composites with solid ionic conductor additives. First investigations were done using model composites of SnO2/Natrium Super Ionic Conductor (NASICON) with the result of a huge sensitivity enhancement to substances ending with R–OH, R–HO or R–COOH groups and a reduction of sensitivity to other gas components. This selectivity of the new composite to those functional groups could be confirmed by catalytic conversion measurements with FTIR-spectroscopy at three gas components, respectively. The specific conductivity of the NASICON containing composites is significantly lower than that of pure SnO2. Advanced studies show that the activation energy of the bulk-conductivity increases by approximately 30% in the presence of NASICON. In spite of high volume parts of NASICON (20%), no polarization effects were found (a complete Ohmic current–voltage behavior) and mainly the resistive part of the electrical impedance is influenced. 相似文献
72.
Karl Heinz Kienitz 《控制论与系统》2013,44(6):647-654
Modifications to Zadeh's theory of approximate reasoning are proposed to enhance the theory's ability to produce plausible inference results. The modifications include the introduction of a different implication definition and a certainty qualification for fuzzy propositions. Plausible reasoning is characterized by a set of reasoning patterns of practical significance. This set is then used to validate the overall approximate reasoning method. 相似文献
73.
Peter Horn Peter Schaaf Brigitte Holbach Stefan Hölzl Heinz Eschnauer 《Zeitschrift für Lebensmitteluntersuchung und -Forschung A》1993,196(5):407-409
For provenance assignments of wines strontium isotope ratios can be used because soils from different wine-growing regions, and hence the wines grown there, each show specific ratios. Some successful applications are demonstrated.
87Sr/86Sr aus Gestein und Boden in Rebe und Wein
Zusammenfassung Zur Herkunftsbestimmung von Weinen können Strontium-Isotopenverhältnisse herangezogen werden, da die Böden verschiedener Weinbaugebiete, und damit die dort gezogenen Weine, jeweils spezifische Verhältnisse aufweisen. Einige erfolgreiche Anwendungen werden demonstriert.相似文献
74.
The use of thermodynamic, statistical, and light and electron‐optical microscopic methods has made it possible to analyse the course of reactions during steel‐plant‐internal hot metal desulphurisation. The theoretical dependence between oxygen and sulphur activity has been used to develop an EMF‐measurement‐based technique for determining the sulphur content as the hot metal is desulphurised. The absence of magnesium sulphide from the collection of phases in the final slag because of the greater stability and secondary formation of calcium sulphide has been explained with the aid of thermo‐chemical calculations. 相似文献
75.
Heinz E. May T. Born D. Zieger G. Anders S. Zakosarenko V. Meyer H.-G. Schäffel C. 《Journal of Infrared, Millimeter and Terahertz Waves》2015,36(10):879-895
Journal of Infrared, Millimeter, and Terahertz Waves - Passive submillimeter-wave imaging is a concept that has been in the focus of interest as a promising technology for personal security... 相似文献
76.
Park JS Jung YW Lee JW Shin DS Chung MS Riemer M Handels H 《Computer methods and programs in biomedicine》2008,92(3):257-266
For the Visible Korean Human (VKH), a male cadaver was serially ground off to acquire the serially sectioned images (SSIs) of a whole human body. Thereafter, more than 700 structures in the SSIs were outlined to produce detailed segmented images; the SSIs and segmented images were volume- and surface-reconstructed to create three-dimensional models. For outlining and reconstruction, popular software (Photoshop, MRIcro, Maya, AutoCAD, 3ds max, and Rhino) was mainly used; the technique can be reproduced by other investigators for creating their own images. For refining the segmentation and volume reconstruction, the VOXEL-MAN system was used. The continuously upgraded technique was applied to a female cadaver's pelvis to produce the SSIs with 0.1mm sized intervals and 0.1mm x 0.1mm sized pixels. The VKH data, distributed worldwide, encouraged researchers to develop virtual dissection, virtual endoscopy, and virtual lumbar puncture contributing to medical education and clinical practice. In the future, a virtual image library including all the Visible Human Project data, Chinese Visible Human data, and VKH data will hopefully be established where users will be able to download one of the data sets for medical applications. 相似文献
77.
R Gomez L Dauwe H Haggerty E Malamud M Nikolic S Hagopian A Pifer R Abrams J Ares H Goldberg C Halliwell S Margulies D McLeod A Salminen J Solomon G Wu S Blessing R Crittenden P Draper A Dzierba R Heinz J Krider T Marshall J Martin A Sambamurti P Smith A Snyder C Stewart T Sulanke A Zieminski R Ellsworth J Goodman S Gupta G Yodh T Watts V Abramov Y Antipov B Baldin S Denisov V Glebov Y Gorin V Kryshkin A Petrukhin S Polovnikov R Sulyaev 《Canadian Metallurgical Quarterly》1987,35(9):2736-2746
78.
S. Nutter C. R. Bower M. W. Gebhard R. M. Heinz G. Spiczak 《Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment》1991,310(3):665-670
Sintered Halon G-80, a polytetrafluoroethylene (PTFE) resin available commercially in powdered form, is a superb diffuse reflector. Sintered Halon has 96% absolute reflectance at wavelengths between 300 nm and 380 nm, and about 98% absolute reflectance above 380 nm. It is chemically inert, is mechanically strong, does not fluoresce, and the high reflectance is easy to maintain over time. We have used sintered Halon as a lining in light integration boxes of water Cherenkov detectors. Preparation involves packing Halon powder into a mold to a specific density, then heating the material almost to the melting point (sintering). A method of preparing sintered Halon is presented. Physical properties of sintered Halon have been measured and we present those results here as well. 相似文献
79.
Dirk Osswald Jan Martin Catherina Burghart Ralf Mikut Heinz Wrn Georg Bretthauer 《Robotics and Autonomous Systems》2004,48(4):33-221
This article presents the approaches taken to integrate a novel anthropomorphic robot hand into a humanoid robot. The requisites enabling such a robot hand to use everyday objects in an environment built for humans are presented. Starting from a design that resembles the human hand regarding size and movability of the mechatronical system, a low-level control system is shown providing reliable and stable controllers for single joint angles and torques, entire fingers and several coordinated fingers. Further on, the high-level control system connecting the low-level control system with the rest of the humanoid robot is presented. It provides grasp skills to the superior robot control system, coordinates movements of hand and arm and determines grasp patterns, depending on the object to grasp and the task to execute. Finally some preliminary results of the system, which is currently tested in simulations, will be presented. 相似文献
80.