全文获取类型
收费全文 | 646篇 |
免费 | 57篇 |
国内免费 | 3篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 303篇 |
金属工艺 | 8篇 |
机械仪表 | 13篇 |
建筑科学 | 25篇 |
矿业工程 | 1篇 |
能源动力 | 19篇 |
轻工业 | 105篇 |
水利工程 | 3篇 |
石油天然气 | 3篇 |
武器工业 | 1篇 |
无线电 | 32篇 |
一般工业技术 | 95篇 |
冶金工业 | 28篇 |
原子能技术 | 1篇 |
自动化技术 | 67篇 |
出版年
2023年 | 16篇 |
2022年 | 76篇 |
2021年 | 71篇 |
2020年 | 20篇 |
2019年 | 28篇 |
2018年 | 28篇 |
2017年 | 31篇 |
2016年 | 40篇 |
2015年 | 26篇 |
2014年 | 28篇 |
2013年 | 46篇 |
2012年 | 47篇 |
2011年 | 43篇 |
2010年 | 43篇 |
2009年 | 36篇 |
2008年 | 33篇 |
2007年 | 17篇 |
2006年 | 17篇 |
2005年 | 11篇 |
2004年 | 4篇 |
2003年 | 8篇 |
2002年 | 3篇 |
2001年 | 4篇 |
2000年 | 3篇 |
1999年 | 4篇 |
1998年 | 4篇 |
1997年 | 6篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1990年 | 2篇 |
排序方式: 共有706条查询结果,搜索用时 15 毫秒
101.
Alexander A. Steinschulte Andrea Scotti Khosrow Rahimi Oleksii Nevskyi Alex Oppermann Sabine Schneider Steffen Bochenek Marie F. Schulte Karen Geisel Felicitas Jansen Andre Jung Sabrina Mallmann Roland Winter Walter Richtering Dominik Wöll Ralf Schweins Nicholas J. Warren Felix A. Plamper 《Advanced materials (Deerfield Beach, Fla.)》2017,29(43)
Near‐equilibrium stimulus‐responsive polymers have been used extensively to introduce morphological variations in dependence of adaptable conditions. Far‐less‐well studied are triggered transformations at constant conditions. These require the involvement of metastable states, which are either able to approach the equilibrium state after deviation from metastability or can be frozen on returning from nonequilibrium to equilibrium. Such functional nonequilibrium macromolecular systems hold great promise for on‐demand transformations, which result in substantial changes in their material properties, as seen for triggered gelations. Herein, a diblock copolymer system consisting of a hydrophilic block and a block that is responsive to both pressure and temperature, is introduced. This species demonstrates various micellar transformations upon leaving equilibrium/nonequilibrium states, which are triggered by a temperature deflection or a temporary application of hydrostatic pressure. 相似文献
102.
Sabrina Vantadori Andrea Carpinteri Karolina Gowacka Fabrizio Greco Tomasz Osiecki Camilla Ronchei Andrea Zanichelli 《Fatigue & Fracture of Engineering Materials & Structures》2021,44(1):3-13
By examining the state of the art, it can be realised that few research works have been done on the fracture behaviour of plastic composites reinforced with continuous glass fibres. Therefore, the present paper deals with the fracture toughness of a unidirectional glass fibre‐reinforced plastic (GFRP), such a parameter being analytically determined by means of the modified two‐parameter model (MTPM). The input data of the MTPM are obtained from an experimental campaign related to three‐point bending tests on single edge‐notched specimens characterised by different sizes. The novelty of this research work is that the MTPM, originally proposed for isotropic materials, is here employed to estimate the fracture toughness of GFRPs characterised by orthotropic mechanical properties. 相似文献
103.
104.
In this article, an extension of the spatial filter method to study Fabry‐Perot antennas with homogeneous or inhomogeneous partially reflecting surface (PRS) of finite size is proposed. This tool was subsequently validated through the study of different Fabry‐Perot antennas, with homogeneous PRS and inhomogeneous GRadient‐INdex (GRIN) PRS that present very high side lobe level (SLL). Since they are due to structure truncation, a new inhomogeneous PRS to reduce the SLL is designed with the new analytical tool. The new inhomogeneous PRS for Fabry‐Perot antenna is characterized by simulations and measurements. Compared to the homogeneous PRS antenna, the proposed PRS allows a SLL reduction of 5 dB without decreasing the 14 dBi directivity. 相似文献
105.
106.
Maria Letizia De Marco Taizhi Jiang Jie Fang Sabrina Lacomme Yuebing Zheng Alexandre Baron Brian A. Korgel Philippe Barois Glenna L. Drisko Cyril Aymonier 《Advanced functional materials》2021,31(26):2100915
A goal in the field of nanoscale optics is the fabrication of nanostructures with strong directional light scattering at visible frequencies. Here, the synthesis of Mie-resonant core–shell particles with overlapping electric and magnetic dipole resonances in the visible spectrum is demonstrated. The core consists of silicon surrounded by a lower index silicon oxynitride (SiOxNy) shell of an adjustable thickness. Optical spectroscopies coupled to Mie theory calculations give the first experimental evidence that the relative position and intensity of the magnetic and electric dipole resonances are tuned by changing the core–shell architecture. Specifically, coating a high-index particle with a low-index shell coalesces the dipoles, while maintaining a high scattering efficiency, thus generating broadband forward scattering. This synthetic strategy opens a route toward metamaterial fabrication with unprecedented control over visible light manipulation. 相似文献
107.
Leoni T Zoubkoff R Homri S Candoni N Vidakovic P Ranguis A Klein H Saúl A Dumas P 《Nanotechnology》2008,19(35):355401
Conductance-elongation curves of gold atomic wires are measured using a scanning tunneling microscope break junction technique at room temperature. Landauer's conductance plateaus are individually identified and statistically analyzed. Both the probabilities to observe and the lengths of the two last plateaus (at conductance values close to 2e(2)/h and 4e(2)/h) are studied. All results converge to show that the occurrences of these two conductance plateaus on a conductance-elongation curve are statistically independent events. 相似文献
108.
Bernard Martel Philippe Le Thuaut Gregorio Crini Michel Morcellet Anna‐Maria Naggi Ulrich Maschke Sabrina Bertini Carmen Vecchi Xavier Coqueret Giangiacomo Torri 《应用聚合物科学杂志》2000,78(12):2166-2173
A novel method for the preparation of immobilized α, β, or γ‐cyclodextrins on polypropylene nonwoven supports has been previously presented. The obtained new materials were prepared by graft‐polymerization of glycidyl methacrylate onto polypropylene after activation of the support by the electron beam technique, followed by the coupling of cyclodextrins with the epoxide groups. The structure of the resulting materials is characterized in detail using Fourier transform infrared spectroscopy, solid state nuclear magnetic resonance analysis, differential scanning calorimetry, thermogravimetric analysis, and optical microscopy. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 2166–2173, 2000 相似文献
109.
Antonio Qualtieri Dr. Elena Urso Maria Le Pera Sabrina Bossio Francesca Bernaudo Tiziana Ferraro Lucia Crescibene Umberto Aguglia Aldo Quattrone 《Proteomics. Clinical applications》2009,3(5):574-583
MALDI‐TOF protein profiling analysis permits the detection of peptides and small proteins in complex protein mixtures with great accuracy. We applied this analysis to cerebrospinal fluid (CSF) from 15 patients affected by Creutzfeldt‐Jakob disease (CJD). We compared the levels of the normalized ion signals of 11 sporadic and 4 genetic CJD forms with those from ten healthy control subjects and eight non‐CJD relapsing‐remitting multiple sclerosis patients. In so doing, we detected 61 differentially expressed ion signals in CJD samples compared to controls. Among the 61 signals, 3 signals had significantly increased levels with high statistical significance (p <0.0001) and were located at 3238.3 m/z, 4963.7 m/z, and 8565.3 m/z. We characterized the 5.0 and 8.6 kDa proteins as thymosin β4 N‐acetylated and free ubiquitin, respectively, while the 3.2‐kDa peptide remained uncharacterized. Although elevated ubiquitin levels have previously been described in CJD, we have demonstrated for the first time the involvement of thymosin β4 in a neurodegenerative disease. To support the validity of thymosin β4 levels obtained by MALDI‐TOF analysis, an independent enzyme immunoassay analysis was performed. Moreover, a validation cohort consisting of CSF from three CJD patients, five healthy subjects, and six non‐CJD relapsing‐remitting multiple sclerosis patients was analyzed in a similar way, yielding superimposable results. We propose that thymosin β4 is a potential new candidate marker for the ante mortem diagnosis of CJD disease. 相似文献
110.
Syntactic foams containing 60 vol% of hollow glass microballoons in epoxy matrix are modified with untreated nanoclays using combined mechanical and ultrasonication methods. Effects of nanoclays on flexure and thermal behavior of syntactic foams are investigated by adding different amount of nanoclays in the range of 1–3% by weight. Microscopic examinations and physical property characterization are performed to determine the interactions among constituent materials and the void formation during fabrication. It is found that the syntactic foams with 2 wt% nanoclays show the highest improvement in flexural properties (∼42% strength and ∼18% modulus) and dynamic mechanical properties (∼30% storage modulus and ∼28% loss modulus) properties. Thermal decomposition temperature is found to be unaffected by the addition of nanoclays, whereas a continuous reduction in the coefficient of thermal expansion (CTE) is observed. An examination of failure surface indicates that the failure is initiated on the tension side of the flexure sample due to fracturing of microballoons. POLYM. COMPOS., 31:1332–1342, 2010. © 2009 Society of Plastics Engineers 相似文献