全文获取类型
收费全文 | 30179篇 |
免费 | 1794篇 |
国内免费 | 1608篇 |
专业分类
电工技术 | 897篇 |
技术理论 | 1篇 |
综合类 | 1441篇 |
化学工业 | 8078篇 |
金属工艺 | 7217篇 |
机械仪表 | 1585篇 |
建筑科学 | 2036篇 |
矿业工程 | 432篇 |
能源动力 | 879篇 |
轻工业 | 1552篇 |
水利工程 | 328篇 |
石油天然气 | 1500篇 |
武器工业 | 380篇 |
无线电 | 959篇 |
一般工业技术 | 4404篇 |
冶金工业 | 1333篇 |
原子能技术 | 193篇 |
自动化技术 | 366篇 |
出版年
2024年 | 134篇 |
2023年 | 521篇 |
2022年 | 814篇 |
2021年 | 905篇 |
2020年 | 844篇 |
2019年 | 794篇 |
2018年 | 782篇 |
2017年 | 992篇 |
2016年 | 926篇 |
2015年 | 982篇 |
2014年 | 1610篇 |
2013年 | 1597篇 |
2012年 | 2087篇 |
2011年 | 2352篇 |
2010年 | 1825篇 |
2009年 | 1747篇 |
2008年 | 1445篇 |
2007年 | 1841篇 |
2006年 | 1860篇 |
2005年 | 1549篇 |
2004年 | 1418篇 |
2003年 | 1110篇 |
2002年 | 1011篇 |
2001年 | 807篇 |
2000年 | 749篇 |
1999年 | 583篇 |
1998年 | 471篇 |
1997年 | 396篇 |
1996年 | 332篇 |
1995年 | 272篇 |
1994年 | 211篇 |
1993年 | 175篇 |
1992年 | 150篇 |
1991年 | 73篇 |
1990年 | 59篇 |
1989年 | 59篇 |
1988年 | 29篇 |
1987年 | 18篇 |
1986年 | 15篇 |
1985年 | 6篇 |
1984年 | 5篇 |
1983年 | 7篇 |
1982年 | 3篇 |
1981年 | 3篇 |
1980年 | 4篇 |
1977年 | 1篇 |
1976年 | 2篇 |
1959年 | 3篇 |
1951年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 705 毫秒
51.
IR2520是自适应镇流器控制器与600V半桥驱动器单片IC ,可用来驱动半桥配置中的荧光灯。文中介绍了IR2520的主要特点和基本原理 ,给出了它的典型应用电路。 相似文献
52.
大型储罐基础非平面倾斜问题的探讨 总被引:2,自引:0,他引:2
大型储罐因基础产生非平面倾斜而影响其正常使用的情况在工程中时有发生,文章通过对某油罐工程中基础沉降观测结果的分析,探讨了储罐基础产生非平面倾斜的原因。相邻储罐之间的相互影响、充水预压未达到规范要求以及地基处理措施不当是引起储罐基础非平面倾斜的主要因素。针对相邻储罐间的相互影响,根据现行《石油化工企业设计防火规范》和《石油化工企业钢储罐地基与基础设计规范》的规定,提出以下建议:储罐布置的净距除应满足防火规范规定外,有条件时也应适当考虑对基础沉降的影响,当采用复合地基时,相邻储罐间的净距不宜小于0.6 D;当占地面积成为主要矛盾,储罐间的净距只能限制在防火规范规定的最小范围时,在地基处理时就应采取有效措施,以尽可能减少相邻储罐的相互影响。 相似文献
53.
54.
阐述了电接点压力表补水泵定压系统的一些应用问题 ,给出了电接点压力表定压点的上、下限计算公式 ,并提出了该系统补给水泵、补给水箱及安全阀的设计选型方法 相似文献
55.
杨加峰 《武汉理工大学学报(材料科学英文版)》2005,20(Z1)
1Introduction HA(hydroxyapatite)wasakindofbioactiveceram ics,whichhadexcellentbiocompatibilityandtissueaffin ityinthatitscomponentsweresimilartothoseofhuman bone[1].Soitwasthebestknownhumanbonesubstitute,andunprecedentedeffecthadbeenharvestedinrecenttwo d… 相似文献
56.
HUANG Jianfeng CAO Liyun ZHANG Chuanbo WU Jianpeng HE Haiyan 《武汉理工大学学报(材料科学英文版)》2005,20(B12):138-140
Nano-particle hydroxyapatite ( HA ) was prepared with a novel ultrasonic precipitation process and the as-prepared nanopowder was used to produce hydroxyapatite ( HA ) coatings on titanium substrate via plasma spraying. The phase and the microstructare of the coating were characterized by X- ray diffraction (XRD) and scanning electron microscopy (SEM). Results showed that spherical particles could be prepared by ultrasonic precipitation process; and a corresponding dense HA coating with molten surface and low-porosity cross-section structure was acquired. During the plasma spraying process, new phases of Ca3 ( PO4 )2 and Ca2 P2O7 were generated. After heat-treating at 800℃ for 1 h, the contents of Ca3 ( PO4 )2 and Ca2 P2O7 decreased while HA content increased. Tensile adhesion tests showed that the plasma sprayed coating prepared with the spherical nanoparticles exhibited high tensile bond strength. 相似文献
57.
Yi‐Hung Chen Ching‐Yuan Chang Wei‐Ling Su Chun‐Yu Chiu Yue‐Hwa Yu Pen‐Chi Chiang Chiung‐Fen Chang Je‐Lueng Shie Chyow‐San Chiou Sally IM Chiang 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2005,80(1):68-75
This study investigates the ozonation of CI Reactive Black 5 (RB5) by using the rotating packed bed (RPB) and completely stirred tank reactor (CSTR) as ozone contactors. The RPB, which provides high gravitational force by adjusting the rotational speed, was employed as a novel ozone contactor. The same ozone dosage was separately introduced into either the RPB or the CSTR for the investigation, while the experimental solution was continuously circulated within the apparatus consisting of the RPB and CSTR. The decolorization and mineralization efficiencies of RB5 in the course of ozonation are compared for these two methods. Moreover, the dissolved and off‐gas ozone concentrations were simultaneously monitored for the further analysis. As a result, the ozone mass transfer rate per unit volume of the RPB was significantly higher because of its higher mass transfer coefficient and gas–liquid concentration driving force. Furthermore, ozonation kinetics was found to be independent of the gravitational magnitude of an ozone gas–liquid contactor. Therefore, the results suggest employing RPBs as ozone‐contacting devices with the advantage of volume reduction. The experimental results, which can be used for further modeling of the ozonation process in the RPB, also show the requirement of correct design for the RPB. Consequently, the present study is useful for the understanding of practical application of RPBs. Copyright © 2004 Society of Chemical Industry 相似文献
58.
A method to produce monodisperse magnetic composite spheres with diameters from less than 100 nm to more than 1 μm in water solution is reported. The spheres consist of a dielectric silica core and a cobalt/cobalt oxide shell which can be protected from further oxidation with an outer shell of silica or, alternatively, they can be covered with the polymer polyvinylpyrrolidone as a stabilizer. The formation of a uniform magnetic shell proceeds with the adsorption of metallic cobalt seeds, produced by the reduction of cobalt chloride with sodium borohydride, on a self‐assembled layer of polyelectrolytes on the silica core. In the second step, an outer silica shell can be formed by the hydrolysis and condensation of (3‐aminopropyl)trimethoxysilane and tetraethoxysilane. The double‐shell composite spheres show excellent sphericity, monodispersity, and a magnetic hysteresis loop at room temperature. 相似文献
59.
青岛市管道燃气公司在大尧罐站对低压16.5万m3干式气柜采用城市燃气直接置换,经合理确定置换范围,标准及过程,成功地进行了低压16.5万m3干式气相及其管道采用城市煤气直接置换的操作。 相似文献
60.