首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   13579篇
  免费   1317篇
  国内免费   521篇
电工技术   448篇
综合类   966篇
化学工业   4128篇
金属工艺   1538篇
机械仪表   519篇
建筑科学   834篇
矿业工程   430篇
能源动力   287篇
轻工业   2267篇
水利工程   186篇
石油天然气   797篇
武器工业   242篇
无线电   644篇
一般工业技术   1197篇
冶金工业   472篇
原子能技术   75篇
自动化技术   387篇
  2025年   116篇
  2024年   310篇
  2023年   294篇
  2022年   444篇
  2021年   479篇
  2020年   476篇
  2019年   361篇
  2018年   333篇
  2017年   410篇
  2016年   412篇
  2015年   405篇
  2014年   563篇
  2013年   650篇
  2012年   789篇
  2011年   865篇
  2010年   671篇
  2009年   743篇
  2008年   660篇
  2007年   871篇
  2006年   876篇
  2005年   774篇
  2004年   623篇
  2003年   537篇
  2002年   463篇
  2001年   430篇
  2000年   380篇
  1999年   285篇
  1998年   221篇
  1997年   209篇
  1996年   153篇
  1995年   133篇
  1994年   111篇
  1993年   65篇
  1992年   84篇
  1991年   46篇
  1990年   33篇
  1989年   39篇
  1988年   20篇
  1987年   11篇
  1986年   8篇
  1985年   9篇
  1984年   7篇
  1983年   10篇
  1982年   8篇
  1981年   7篇
  1979年   7篇
  1978年   3篇
  1977年   6篇
  1976年   4篇
  1951年   1篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
熔体塔式造粒法生产尿基复混肥   总被引:2,自引:0,他引:2  
汪家铭 《化肥工业》2007,34(1):32-34,44
化肥企业生产尿基复混肥对于农业科学施肥、提高肥料利用率、避免环境污染及促进企业产品结构调整都具有十分重要的意义。熔体塔式造粒法生产尿基复混肥较之其它方法优越性更为显著,笔者简要介绍该法的生产机理、工艺流程、技术特点、国内现状及产品市场前景等方面的一些情况。  相似文献   
2.
Ren Tao  Liu Qingyou 《Advanced Robotics》2014,28(17):1165-1175
The modern society is fuelled by very comprehensive grids of gas and liquid pipelines. In recent years, various in-pipe robots have been developed for inspection and maintenance tasks inside such pipes. In this paper, a novel in-pipe robot is proposed and developed for gas/oil well interventions at thousands of meters downhole. Due to the nature of such intervention, in-pipe robot design must be capable of carrying a very large payload, as large as 2500?N inside a pipe with diameter as small as 54?mm. The proposed design concept is based on a compound planetary gearing system. One of the major novelties of this design is the use of pipe wall as a ring gear for one stage of the compound planetary gear system; the other novelty is the generation of helical angle when the planetary gears are expanded to press on the pipe wall. The proposed concept is compact, efficient, and has never been reported before. In this paper, the helical angle, the velocity, and load capability of the proposed system will be analyzed. The load transportation capability of the proposed robot is also measured based on an experiment. Initial data have shown great potential in carrying large payloads.  相似文献   
3.
介绍了橡胶工业橡制品生产中胶坯制备的三种方法,其中详细介绍了精密预成型机制备胶坯。以上海德仁橡塑机械有限公司物精密预成型机为例,从结构,性能及工艺参数等方面进行了分析,说明精密预成型机是批量生产橡胶模型制品的一种得力辅助设备。  相似文献   
4.
The effect of Mg-doping and Li overstoichiometry on the structural stability of LiCoO2 powders has been investigated with emphasis to voltammetric properties. Microparticle cyclic voltammetry (CV) conducted in caustic NaOH to best simulate a non-aqueous electrolyte shows a marked improvement of the structure stability of doped LiCoO2. In contrast to the unsubstituted LiCoO2 sample which shows voltammetric peaks associated to the well-known two-phase domain and monoclinic distortion reactions, in Li1.08Mg0.06CoO2, LiMg0.06CoO2 and Li1.08CoO2 samples these peaks are strongly suppressed providing direct evidence for the existence of a stable solid solution with negligible phase transitions in the reversible intercalation region (3.8-4.2 V vs. Li) as well as in the overcharged region. The effect is higher with Mg-doping, irrespective of the Li overstoichiometry. However, the concomitant presence of Mg and Li excess in the structure is important for obtaining small particle sizes. Since Mg-doping induces a quasi metallic behavior in the samples, whereas the Li excess may provide an higher initial capacity, it is suggested that the Li1.08Mg0.06CoO2 composition may be of interest as positive cathode for advanced Li-ion batteries.  相似文献   
5.
Banding formation and eutectic lamellar growth in a directionally solidified Ni50Al20Fe30 alloy were investigated. It was found that the banding area consists of two layers. The first layer is a γ layer, while the subsequent one is a γ layer. The composition of various phases around the banding area changes with the solidification process. The banding is formed by two steps process and caused by factors such as the fractions during the sample growth process. It was found that the band was found at relatively low growth rate. Therefore. this study indicates that increasing the growth rate is an effective method to eliminate the band formation. Eutectic lamellae nucleate and grow again after the banding formation. During the initial transition lamellar growth, the relationship between the square lamellar spacing, γ2, and the distance from, the banding, d, can be described by the following equation: γ2 = K [1-exp(A.d)] where K and A are constant.  相似文献   
6.
7.
介绍硝酸铵-磷酸-铵-硫酸钾系高浓度烤烟专用复合肥的开发应用,三年的试验推广的实践证明,其肥效可与进口肥相媲美,配方合理,但价格比进口肥每吨低400元左右。  相似文献   
8.
聚乙烯钢塑复合管导热系数的测定   总被引:2,自引:0,他引:2  
唐酞峰 《中国测试技术》2005,31(4):27-29,56
聚乙烯钢塑复合管是新一代替代传统管道的新型管材,其导热系数的测试及相关的数据目前还没有报导。本文利用一维、稳态传热的基本规律,采用相对简单易行、测试成本低、较能真实反映实际情况的测试装置,对成都某企业的聚乙烯钢塑复合管导热系数进行了测试,获取了较满意的测试结果,并对测试结果的准确性进行了分析。所采用的测试方法及所获取的数据,对相应的生产厂家、设计、施工单位具有一定的指导意义。  相似文献   
9.
In order to understand the relationship between crystal structure and thermoelectric properties, the neutron diffraction patterns of the thermoelectric materials with the nominal composition CexCo4Sb12 (x = 0.5, 1.0) were measured at room temperature, the data were fitted by the Rietveld profile refinement method using the Fullprof2k program. It is found that the sample Ce0.5Co4Sb12 is composed of two phases, its major phase is CoSb3 with skutterudite-structure and the Ce atom is not incorporated into the lattice, the impurity is monoclinic CoSb2. In the case of Ce1.0Co4Sb12, the major phase is filled skutterudite, about 10% of the 2a site is occupied by Ce atom, the second phase is monoclinic CoSb2.  相似文献   
10.
In order to represent legal knowledge adequately, it is vital to create a formal device that can freely construct an individual concept directly from a predicate expression. For this purpose, a Compound Predicate Formula (CPF) is formulated for use in legal expert systems. In this paper, we willattempt to explain the nature of CPFs by rigorous logical foundation, i.e., establishing their syntax and semantics precisely through the use of appropriate examples. We note the advantages of our system over other such systems and discuss the significance of CPFs with regard to the formalization of legal reasonings using examples from the United Nations Convention for the International Sale of Goods.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号