全文获取类型
收费全文 | 11553篇 |
免费 | 1826篇 |
国内免费 | 260篇 |
专业分类
电工技术 | 16篇 |
综合类 | 532篇 |
化学工业 | 1273篇 |
金属工艺 | 425篇 |
机械仪表 | 67篇 |
建筑科学 | 453篇 |
矿业工程 | 5153篇 |
能源动力 | 133篇 |
轻工业 | 57篇 |
水利工程 | 12篇 |
石油天然气 | 39篇 |
武器工业 | 1篇 |
无线电 | 194篇 |
一般工业技术 | 487篇 |
冶金工业 | 4631篇 |
原子能技术 | 71篇 |
自动化技术 | 95篇 |
出版年
2024年 | 43篇 |
2023年 | 125篇 |
2022年 | 304篇 |
2021年 | 372篇 |
2020年 | 444篇 |
2019年 | 351篇 |
2018年 | 339篇 |
2017年 | 412篇 |
2016年 | 579篇 |
2015年 | 501篇 |
2014年 | 763篇 |
2013年 | 706篇 |
2012年 | 795篇 |
2011年 | 967篇 |
2010年 | 695篇 |
2009年 | 650篇 |
2008年 | 526篇 |
2007年 | 633篇 |
2006年 | 475篇 |
2005年 | 454篇 |
2004年 | 401篇 |
2003年 | 422篇 |
2002年 | 327篇 |
2001年 | 325篇 |
2000年 | 329篇 |
1999年 | 282篇 |
1998年 | 225篇 |
1997年 | 205篇 |
1996年 | 170篇 |
1995年 | 189篇 |
1994年 | 126篇 |
1993年 | 108篇 |
1992年 | 98篇 |
1991年 | 59篇 |
1990年 | 58篇 |
1989年 | 64篇 |
1988年 | 34篇 |
1987年 | 27篇 |
1986年 | 12篇 |
1985年 | 4篇 |
1984年 | 3篇 |
1982年 | 5篇 |
1981年 | 4篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1971年 | 2篇 |
1968年 | 2篇 |
1966年 | 2篇 |
1965年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
The increasing use of microelectrodes in small sample volumes and biological environments require the use of thin film insulators. The insulating ability of the thin film insulators electrophoretic paint, polyimide, allylphenol phenol copolymer and an epoxy dip coat have been assessed using gold wires coated in the relevant film. Insulation was assessed by recording the current from the wires in a solution of known redox couple. The effect of prolonged storage in aqueous solutions was also investigated. The most successful insulating approach, with regards to insulative ability, prolonged use in aqueous environments and speed of application, was the combination of cathodic electrophoretic paint followed by polyimide. 相似文献
52.
D. Faurie P.-O. Renault G. Patriarche E. Le Bourhis 《Surface & coatings technology》2006,201(7):4300-4304
The elastic behavior of supported gold thin films has been studied using a framework in which the elastic interaction between grains and the actual structure of the film (i.e. preferential grain orientation and grain shape) are taken into account. Experiments were carried out using synchrotron X-ray diffraction combined with in-situ tensile testing and thereafter, no assumptions on the residual stress state and on the stress-free lattice parameter a0 have to be made. Modeling of grain elastic interactions is based on the extension of Eshelby-Kröner model, which allows for estimating the elastic behavior of polycrystals considering the texture and the shape of the crystallites. Flat-disc shaped grains arrangement is shown to yield the best representation of the elastic behavior of the fiber-textured gold thin films composed of columnar grains. This non-intuitive representation results from free-surface effect. 相似文献
53.
H. Fan A. Wright J. Gabaldon A. Rodriguez C.J. Brinker Y.‐B. Jiang 《Advanced functional materials》2006,16(7)
The synthesis of three‐dimensionally ordered, transparent gold‐nanocrystal (NC)/silica superlattice thin films using the self‐assembly (by spin‐coating) of water‐soluble gold nanocrystal micelles and soluble silica is reported by Fan and co‐workers on p. 891. The robust, 3D NC/silica superlattice films are of interest for the development of collective optical and electronic phenomena, and, importantly, for the integration of NC arrays into device architectures. Nanocrystals and their ordered arrays hold many important applications in fields such as catalysis, surface‐enhanced Raman spectroscopy based sensors, memory storage, and electronic and optical nanodevices. Herein, a simple and general method to synthesize ordered, three‐dimensional, transparent gold nanocrystal/silica superlattice thin films by self‐assembly of gold nanocrystal micelles with silica or organosilsesquioxane by spin‐coating is reported. The self‐assembly process is conducted under acidic sol–gel conditions (ca. pH 2), ensuring spin‐solution homogeneity and stability and facilitating the formation of ordered and transparent gold nanocrystal/silica films. The monodisperse nanocrystals are organized within inorganic host matrices as a face‐centered cubic mesostructure, and characterized by transmission electron spectroscopy and X‐ray diffraction. 相似文献
54.
Teresa Łuczak 《Journal of Applied Electrochemistry》2008,38(4):469-476
The electrooxidation of phenylethanolamine (2-amino-1-phenylethanol) at a gold electrode in alkaline electrolyte has been
studied. Measurement of the differential capacitance of the electric double layer versus the electrode potential has shown
that the adsorption of phenylethanolamine at the gold-solution interface plays a significant role in the oxidation mechanism.
The effect of amine concentration, electrolyte pH and potential scan rate on the electrooxidation is analysed. 相似文献
55.
David P. Cormode Jason J. Davis Paul D. Beer 《Journal of Inorganic and Organometallic Polymers and Materials》2008,18(1):32-40
Disulfide and dithiocarbamate functionalized porphyrins have been synthesized and used as protecting ligands for gold nanoparticle
formation either via ligand substitution reactions or by direct synthesis. These nanoparticles have been shown to recognize
anions via changes in the absorbance spectrum of the surface adsorbed porphyrin moieties. Association constants, derived from
quantitative titrations, indicate a remarkable surface enhancement effect where the surface bound porphyrins bind anions much
more strongly than the free receptor in solution. 相似文献
56.
57.
A novel and efficient way of producing of aldonic acids is reported. The selective catalytic oxidation of monosaccharides (arabinose, ribose, xylose, lyxose, mannose, rhamnose, glucose, galactose, N-acetyl-glucosamine) and disaccharides (lactose, maltose, cellobiose, melibiose) on Au, Pd and Pt catalysts was investigated. By using the gold catalyst, a total selectivity with respect to aldonic acids and a high catalytic activity for all investigated sugars was found. The reaction conditions for the production of maltobionic and lactobionic acids via oxidation on gold catalysts were optimised. A high long-term stability of two different gold catalysts for the oxidation of maltose and lactose, respectively, was found. 相似文献
58.
攀枝花矿产资源特征及循环经济发展策略探讨 总被引:2,自引:0,他引:2
文章着重描述了攀枝花矿产资源特征、资源矿物流向和资源产品定位,分析了资源矿物使用行业的不同特点,明确了针对攀枝花矿产资源利用的循环经济目标,根据资源循环利用技术水平和资源循环开发现状,提出了攀枝花矿的循环经济发展策略. 相似文献
59.
Numerical Simulation of Independent Advance of Ore Breaking in the Non-pillar Sublevel Caving Method 总被引:1,自引:0,他引:1
ZHOU Chuan-bo YAO Ying-kang GUO Liao-wu YIN Xiao-peng FAN Xiao-feng SHANG Ying 《中国矿业大学学报(英文版)》2007,17(2):295-300
The mechanism of stress generation and propagation by detonation loading in five separate independent advance of ore breaking patterns is discussed in the paper. An elastic numerical model was developed using AN- SYS/LS-DYNA 3D Nonlinear Dynamic Finite Element Software. In this package ANSYS is the preprocessor and LS-DYNA is the postprocessor. Numerical models in the paper to actual were l:10 and the element mesh was dissected in scanning mode utilizing the symmetry characteristics of the numerical model. Five different advance rates were studied. Parameters, such as the time required to maximum stress, the action time of the available stress, the maximum velocity of the nodes, the stress penetration time, the magnitude of the stress peak and the time duration for high stress were numerically simulated. The 2.2 m advance appeared optimum from an analysis of the simulation results. The results from numerical simulation have been validated by tests with physical models. 相似文献
60.
新城金矿采场落矿控制爆破技术 总被引:1,自引:1,他引:0
新城金矿为蚀变岩型金矿床,由于受地质构造影响,顶板稳定性较差,局部和较大面积的顶板冒落现象时有发生,为了解决采场顶板安全问题和提高落矿主要技术经济指标而进行了“上向水平分层尾砂胶结充填法采场控制爆破技术”的试验研究工作,试验达到了预期效果。 相似文献