全文获取类型
收费全文 | 11161篇 |
免费 | 1050篇 |
国内免费 | 562篇 |
专业分类
电工技术 | 1104篇 |
综合类 | 741篇 |
化学工业 | 1999篇 |
金属工艺 | 442篇 |
机械仪表 | 557篇 |
建筑科学 | 538篇 |
矿业工程 | 386篇 |
能源动力 | 1006篇 |
轻工业 | 320篇 |
水利工程 | 114篇 |
石油天然气 | 584篇 |
武器工业 | 95篇 |
无线电 | 2122篇 |
一般工业技术 | 1010篇 |
冶金工业 | 307篇 |
原子能技术 | 165篇 |
自动化技术 | 1283篇 |
出版年
2024年 | 46篇 |
2023年 | 212篇 |
2022年 | 265篇 |
2021年 | 355篇 |
2020年 | 406篇 |
2019年 | 347篇 |
2018年 | 298篇 |
2017年 | 372篇 |
2016年 | 381篇 |
2015年 | 407篇 |
2014年 | 702篇 |
2013年 | 653篇 |
2012年 | 811篇 |
2011年 | 889篇 |
2010年 | 678篇 |
2009年 | 640篇 |
2008年 | 617篇 |
2007年 | 682篇 |
2006年 | 653篇 |
2005年 | 517篇 |
2004年 | 460篇 |
2003年 | 437篇 |
2002年 | 364篇 |
2001年 | 325篇 |
2000年 | 245篇 |
1999年 | 187篇 |
1998年 | 133篇 |
1997年 | 115篇 |
1996年 | 114篇 |
1995年 | 88篇 |
1994年 | 79篇 |
1993年 | 54篇 |
1992年 | 61篇 |
1991年 | 31篇 |
1990年 | 25篇 |
1989年 | 19篇 |
1988年 | 20篇 |
1987年 | 11篇 |
1986年 | 5篇 |
1985年 | 16篇 |
1984年 | 10篇 |
1983年 | 7篇 |
1982年 | 9篇 |
1981年 | 9篇 |
1980年 | 7篇 |
1979年 | 3篇 |
1977年 | 2篇 |
1975年 | 2篇 |
1973年 | 1篇 |
1951年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
根据电梯系统的结构特点及控制要求,设计了基于PLC控制的电梯教学模型。详细阐述了模型电梯系统的硬件构成和软件实现方法。试验表明,该实验装置提高了PLC实验课的教学质量。 相似文献
112.
113.
V.V. Zyryanov N.F. Uvarov V.A. Sadykov Y.V. Frolova G.M. Alikina A.I. Lukashevich M.I. Ivanovskaya J.M. Criado S. Neophytides 《Catalysis Today》2005,104(2-4):114-119
Nanopowders of LaGaO3- and LaMnO3-based complex perovskites (P) and ceria-based fluorites (F) were prepared by mechanosynthesis. Compatible nanocomposites F + P and P + P with mixed ion and electron conducting (MIEC) properties were prepared and sintered at moderate temperatures up to dense ceramics. The obtained materials were studied by means of XRD, SEM, TEM, electrical conductivity measurements, temperature programmed (TP) reduction/oxidation and preliminary estimations of permeability were obtained. A new strategy based on the advantages of the mechanochemical ceramic approach is proposed to design multilayer ceramic membranes for CMR. Casting technology and one-step sintering were used for the production of thin film membranes with MIEC properties on porous substrates. The coarse fraction of as-milled powders from agglomerates with density 70% was used for the porous substrate, and fine fractions of aggregates with sizes <1 μm were used in preparation of composites for thin dense films. Ceria-based composites prepared by the Pechini route and/or mechanochemical method are proposed as materials for protecting thin films. 相似文献
114.
为开发高活性、高收率的合成气制低碳烯烃(STO)双功能催化剂,通过共沉淀法制备非化学计量尖晶石Zn-Cr-Al氧化物,对其织构性质、晶体结构、形貌特征以及表面电荷性质等进行研究。结果表明添加过量锌能够促进晶体粒径减小,表面氧空位增多。其中Zn/(Cr+Al)摩尔比为1.25时锌含量较为适宜,将其与SAPO-34沸石分子筛结合为双功能催化剂用于STO性能研究。在进气n(H2):n(CO)=2:1,3000 mL/(gcat·h),3.2 MPa,400 ℃反应条件下,实现46.9% CO转化率,C2-4烯烃收率高达15.9%,高于大部分已有文献报道(8~14%),特别是副产物CO2选择性仅29.2%,低于普遍报道的40~50% CO2选择性。并且催化剂运行100 h后活性良好,稳定的催化性能使其具有工业应用价值。 相似文献
115.
A new method of recovering the original colors of black-and-white (B&W) halftoned images with homogeneous dot patterns is proposed. The conventional inverse halftoning method, which uses a look-up table (LUT), can establish the relation between the halftoned patterns and the corresponding gray levels, while the conventional reversible color to gray conversion method can recover the original colors from a given color-embedded gray image. To accomplish our goal of original color recovery from B&W halftoned patterns, an approach of combining the conventional inverse halftoning and reversible color to gray conversion is presented in this paper. Differently from the conventional method of inverse halftoning via LUT, four LUTs categorized according to the red, green, blue, and gray reference colors are designed to more accurately map a specific B&W halftone pattern into the corresponding color-embedded gray level based on the observation that the shapes of the halftone patterns depend on input colors, thereby increasing the color recovery accuracy. Also, a color mapping method based on a linear regression which models the relation between the recovered colors and the original colors is introduced to adjust the initially recovered colors more closely to the original colors. Experimental results show that unknown original colors can be recovered from B&W halftoned images via the proposed method. 相似文献
116.
开发海洋潮流能对缓解能源危机具有重要意义,电力变换系统是潮流能发电系统的关键技术之一。提出了一种利用SOPC技术实现潮流能发电电力变换控制系统的设计方法,采用单片高性能FPGA芯片构建双NIOSⅡ软核系统,其中一个NIOSⅡ处理器负责系统任务调度和能量管理,一个NIOSⅡ处理器负责电力变换控制和异常诊断。针对电力变换系统的信息数据特点,提出了基于RAM、FIFO、GPIO的双NIOSⅡ处理器握手机制,并给出了系统的具体设计实现。该双NIOSⅡ处理器系统提高了系统的任务调度灵活性、控制算法处理速度和应急处理能力。 相似文献
117.
118.
Buckminsterfullerene encapsulated within zeolite Y is found not to be a reactive radical initiator for the formation of dimethoxyethane from dimethyl ether below 200° C. Above this temperature the expected acid catalysed conversion of dimethyl ether to hydrocarbons is observed. Dimethoxyethane formation is observed when bibenzoyl peroxide is used as a radical initiator. These studies indicate that any radical formed by the encapsulated buckminsterfullerene is relatively unreactive. 相似文献
119.
120.
Low temperature steam reforming of ethanol in the temperature range of 200–360°C was studied to maximize the production of H2. The optimum reaction conditions in presence of a suitable catalyst can produce mainly the desired products H2 and CO2. Cu/Al2O3 catalysts with six different concentrations ranging from 0 to 10 wt.% Mn, were prepared, characterized and studied for the ethanol-steam reforming reaction. Maximum ethanol conversion of 60.7% and hydrogen yield of 3.74 (mol H2 / mol ethanol converted) were observed at 360°C for catalyst with 2.5 wt.% Mn loading. 相似文献