全文获取类型
收费全文 | 465篇 |
免费 | 14篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 6篇 |
综合类 | 1篇 |
化学工业 | 139篇 |
金属工艺 | 7篇 |
机械仪表 | 18篇 |
建筑科学 | 4篇 |
矿业工程 | 4篇 |
能源动力 | 30篇 |
轻工业 | 15篇 |
水利工程 | 2篇 |
石油天然气 | 13篇 |
无线电 | 22篇 |
一般工业技术 | 120篇 |
冶金工业 | 4篇 |
原子能技术 | 7篇 |
自动化技术 | 88篇 |
出版年
2024年 | 1篇 |
2023年 | 2篇 |
2022年 | 15篇 |
2021年 | 16篇 |
2020年 | 8篇 |
2019年 | 10篇 |
2018年 | 15篇 |
2017年 | 9篇 |
2016年 | 19篇 |
2015年 | 6篇 |
2014年 | 23篇 |
2013年 | 31篇 |
2012年 | 39篇 |
2011年 | 35篇 |
2010年 | 12篇 |
2009年 | 21篇 |
2008年 | 23篇 |
2007年 | 25篇 |
2006年 | 26篇 |
2005年 | 29篇 |
2004年 | 15篇 |
2003年 | 16篇 |
2002年 | 13篇 |
2001年 | 14篇 |
2000年 | 6篇 |
1999年 | 12篇 |
1998年 | 2篇 |
1997年 | 7篇 |
1996年 | 4篇 |
1995年 | 6篇 |
1993年 | 6篇 |
1992年 | 3篇 |
1991年 | 5篇 |
1989年 | 1篇 |
1984年 | 2篇 |
1982年 | 1篇 |
1978年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有480条查询结果,搜索用时 15 毫秒
31.
We consider discrete-time systems x(k + 1) = Ax(k) + f(x(k)) where the matrix A of the linear part is known and positive, the non-linearity f is unknown but belongs to a class for which A + f(x) is positive with spectral radius < 1 for all x Rn. This, with the additional property that x - Ax - f (x) is proper, is sufficient for global stability of the system. The results are applied to the continuous system x. = Ax + B phialt(CT x) by considering the translation operator along trajectories and studying the resulting discrete system. 相似文献
32.
Mikhail B. Novikov Tatiana A. Borodulina Sergey V. Kotomin Valery G. Kulichikhin 《The Journal of Adhesion》2013,89(1):77-107
Relaxation properties of pressure-sensitive adhesives (PSA) have been studied with the squeeze-recoil tester used in the regime of parallel-plate dilatometer under conditions imitating the removal of compressive force in the course of adhesive bond formation. The relaxation properties of PSAs are compared with their adhesive behavior measured using the 180-Deg Peel Test. Two classes of PSAs are considered: 1) conventional rubbery adhesives based on the mixtures of styrene-isoprene-styrene (SIS) block copolymer with a tackifier resin and a plasticizer, and butyl rubber plasticized with low-molecular-weight polyisobutylene, and 2) hydrophilic PSAs composed of the blends of high-molecular-weight poly(N-vinyl pyrrolidone) (PVP) with oligomeric polyethylene glycol (PEG). By comparing the adhesive and relaxation behaviors of different PSAs, the relaxation criteria for pressure-sensitive adhesion have been stated. Relaxation behavior of the examined PSAs demonstrates two values of retardation time: the shorter retardation time of 10–70?sec and the longer time of 300–660?sec. These times can be associated, respectively, with small- and large-scale mechanisms of strain recovery. By comparing the relaxation and adhesive properties of PVP-PEG blend (which involves the formation of a hydrogen-bonded network through both terminal hydroxyl groups in PEG short chains) with the properties of covalently crosslinked copolymers of vinyl pyrrolidone (VP) with PEG-diacrylate and comb-like VP copolymers with PEG-monomethacrylate, the contributions of covalent crosslinking and H-bonding network have been characterized. 相似文献
33.
Valery Y. Glizer 《Systems & Control Letters》2001,43(3):1
A singularly perturbed linear time-dependent control system with small point and distributed delays in state variables is considered. Connections between the properties of controllability of the reduced-order and boundary-layer systems, associated with the original one, and such a property of the original system itself are established. 相似文献
34.
Valery D. Rumyantsev Alexander V. Chekalin Nikolay Yu. Davidyuk Nikolay A. Sadchikov Antonio Luque 《Progress in Photovoltaics: Research and Applications》2016,24(2):211-218
A method for the evaluation of p–n junction cell temperature in PV modules operating in the maximum power point (MPP) mode has been proposed. The method does not require specialized equipment and (for the concentrator modules) the data on the open circuit (OC) voltage temperature coefficients measured under pulse illumination. It consists of measuring several open circuit voltage magnitudes together with temperature measurements on the external module surface near one of the cells. In this procedure, a fast transition from MPP to OC operational mode is carried out, during which a time‐dependent voltage measurement is carried out with the help of a memory oscilloscope. A “reference” OC voltage magnitude in a “cold” module (a condition, as if the cells are kept at ambient temperature) is obtained by calculations, so that there is no necessity in a fast mechanical shuttering of the module aperture area. In the case of the concentrator modules, the module OC voltage temperature coefficient can be measured, if heat sinking process is artificially modified during outdoor measurements. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
35.
Eu-activated BaAl2 S4 (BaAl2 S4 :Eu) blue light emission phosphor has attracted considerable attention recently as a prospective material for full color electroluminescent display applications. Although BaAl2 S4 :Eu was discovered over 30 years ago, the solid-state reaction between metal sulfides in sealed quartz ampoules remains the main method for the synthesis of this material. In this work, a homogeneous single-phase Ba0.95 Eu0.05 Al2 S4 (BaAl2 S4 :Eu) phosphor was obtained by the sulfurization–reduction of the multicomponent oxide precursor in a CS2 atmosphere at 1050°C. The oxide precursor containing barium, aluminum, and europium for this process was prepared by the polymerizable complex method, which ensures a high degree of homogeneity in the final product. The BaAl2 S4 :Eu material thus obtained exhibited a single emission line at 475 nm and a fluorescence intensity of 35% compared with one of the best commercially available (Ba,Eu)MgAl10 O17 phosphors. 相似文献
36.
Valery P. Privalko 《The Journal of Adhesion》2013,89(3-4):315-316
Bonding aluminum metal and its alloys with epoxy adhesives is sensitive to process variables, particularly surface contamination and moisture exposure. In the past, several surface modification schemes have been developed to improve the epoxy-bonding of aluminum. The present work describes a simple process that produces significant improvement in strength and durability of epoxy-bonded aluminum. In this process, aluminum surfaces are first rinsed with dilute sodium metasilicate solution followed by a dilute aqueous epoxysilane solution. The combination of the two materials exhibits a bond strength synergism as measured by bondline fracture toughness. The treated aluminum surface also exhibits a significant increase in bond strength tolerance to contamination and moisture exposure. The effect of epoxysilane chemical structure on bond durability was examined, as was the role of the silicate surface treatment. 相似文献
37.
38.
39.
Georgy Terentyuk Elizaveta Panfilova Vitaly Khanadeev Daniil Chumakov Elina Genina Alexey Bashkatov Valery Tuchin Alla Bucharskaya Galina Maslyakova Nikolai Khlebtsov Boris Khlebtsov 《Nano Research》2014,7(3):325-337
Nanocomposites (NCs) consisting of a gold nanorod core and a mesoporous silica shell doped with hematoporphyrin (HP) have been fabricated in order to improve the efficiency of cancer treatment by combining photothermal and photodynamic therapies (PDT + PTT) in vivo. In addition to the long-wavelength plasmon resonance near 810-830 nm, the fabricated NCs exhibited a 400-nm absorbance peak corresponding to bound HP, generated singlet oxygen under 633-nm excitation near the 632.5-nm Q-band, and produced heat under a 808-nm near-infrared (NIR) laser irradiation. These modalities were used for a combined PDT + PTT treatment of large (about 3 cm3) solid tumors in vivo with a xenorafted tumor rat model. NCs were directly injected into tumors and irradiated simultaneously with 633-nm and 808-nm lasers to stimulate the combined photodynamic and photothermal activities of NCs. The efficiency of the combined therapy was evaluated by optical coherence tomography, histological analysis, and by measurements of the tumor volume growth during a 21-day period. The NC-mediated PDT led to weak changes in tissue histology and to a moderate 20% decrease in the tumor volume. In contrast, the combined PDT + PTT treatment resulted in the large-area tumor necrosis and led to dramatic decrease in the tumor volume. 相似文献
40.
Skeeba Vadim Pushnin Valery Erohin Ivan Kornev Dmitry 《Materials and Manufacturing Processes》2015,30(12):1408-1411
The article describes a new method for integrated processing which combines high-energy heating by high frequency currents (HEH HFC) and abrasive grinding. Research clearly showed that implementation of integrated processing may lead to 2 … 2.5-fold increasing of the processing performance. It was established experimentally that the proposed integrated treatment results in increasing of the microhardness and the level of residual compressive stresses in the surface layer. This increases the contact–fatigue strength of steel parts up to 10% … 16%. 相似文献