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   13030篇
  免费   1099篇
  国内免费   293篇
电工技术   183篇
技术理论   1篇
综合类   681篇
化学工业   2859篇
金属工艺   307篇
机械仪表   528篇
建筑科学   540篇
矿业工程   235篇
能源动力   238篇
轻工业   5162篇
水利工程   397篇
石油天然气   333篇
武器工业   45篇
无线电   277篇
一般工业技术   1317篇
冶金工业   389篇
原子能技术   256篇
自动化技术   674篇
  2025年   132篇
  2024年   428篇
  2023年   372篇
  2022年   511篇
  2021年   682篇
  2020年   737篇
  2019年   548篇
  2018年   567篇
  2017年   553篇
  2016年   599篇
  2015年   543篇
  2014年   780篇
  2013年   1007篇
  2012年   802篇
  2011年   720篇
  2010年   594篇
  2009年   532篇
  2008年   471篇
  2007年   554篇
  2006年   498篇
  2005年   414篇
  2004年   362篇
  2003年   345篇
  2002年   300篇
  2001年   236篇
  2000年   187篇
  1999年   153篇
  1998年   125篇
  1997年   122篇
  1996年   76篇
  1995年   75篇
  1994年   55篇
  1993年   52篇
  1992年   53篇
  1991年   14篇
  1990年   26篇
  1989年   22篇
  1988年   21篇
  1987年   28篇
  1986年   26篇
  1985年   31篇
  1984年   23篇
  1983年   11篇
  1982年   17篇
  1981年   5篇
  1980年   8篇
  1978年   1篇
  1976年   1篇
  1970年   1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.
This paper assesses the impacts of a GTL plant on the expansion of Brazil's oil refining segment. The GTL plant (50,000 bpd) was sized to start up operations in 2015, producing diesel and naphtha through the indirect route (FT-synthesis). This plant will consume the non-associated natural gas production from the recent discoveries at the Santos Basin (around 419 Bm3), and the associated gas production from the Campos Basin. Both basins are located in the Southeast of Brazil, the most populated, rich and industrialized region of the country. Two different criteria for refinery expansion were simulated in order to meet oil product demand scenarios. Findings show that depending on the refinery expansion criteria considered GTL will play a fundamental hole to meet the oil product demand forecast to Brazil in the next 10 years.  相似文献   
2.
3.
C.S. Li  P.K. Hopke 《Indoor air》1992,2(2):84-100
Air cleaning as a means of mitigating the risks arising from exposure to indoor radon progeny has been evaluated in a single-family house in the north eastem US. using an automated, semi-continuous activity-weighted size distribution measurement system. The measurements included radon concentration, condensation nuclei count, and activity-weighted size distribution of radon decay products. Measurements were made in the house with and without an operating air filtration system and with various particle sources common to normal indoor activities operating. Aerosols were generated by running water in a shower, candle burning, cigarette smoking, vacuuming, opening doors, and cooking. Using a room model, the changes in attachment rates, average attachment diameters, and deposition rates of the unattached fraction with and without the air cleaning system were calculated. In the presence of active aerosol sources, the air filtration unit typically reduced the concentration of particles within the hour following the end of particle generation. After candle burning, cigarette smoking, and vacuuming in the bedroom, the reductions of PAEC by air filtration are about 60% with the air filtration system operating in the bedroom. During cooking in the kitchen, the reductions of PAEC in the bedroom with the air filtration system were about 40%. However, for all cases the dose reductions were smaller than the particle and PAEC reductions. For those particles that were generated within the bedroom, there was a 20% to 50% reduction in dose. In the case of cooking where the door was open and particles infiltrated from the rest of the house, the dose reduction was only 5% on average and appears to be insignificant. Thus, the dose reductions were h e r than the reductions in activity concentration, but there were no cases where the estimated dose actually increased.  相似文献   
4.
Between 1998 and 2002, surface water samples were collected from several sites in the Don River and Humber River watersheds, both tributaries to Lake Ontario, and analyzed for a variety of pesticides, including those used for urban lawn care. Analyses included 152 pesticide active ingredients and eight metabolites. Samples were collected during base flow periods (i.e., dry events) and rainfall events (i.e., wet events). The objectives of the study were to determine which pesticides were detectable, whether there was a difference in the detection frequency between the two watersheds and between upstream and downstream in each river, and whether precipitation influenced the frequency of detection. Eleven pesticides and one metabolite were detected in surface waters of the Don and Humber rivers or their tributaries, with approximately 72% of samples containing at least one pesticide attributable to lawn care use. The pesticides and pesticide metabolite detected in this study included 2,4-D, atrazine, bromacil, carbofuran, chlorpyrifos, cypermethrin, diazinon, dicamba, MECOPROP, metolachlor, metribuzin, and an atrazine metabolite (des-ethyl atrazine). Four pesticides exceeded federal or provincial water quality guidelines/objectives. Diazinon exceeded the provincial water quality objective in 28% of the samples taken. For the three other pesticides (atrazine, carbofuran and chlorpyrifos) exceedance of a water quality criteria occurred in less than 1% of the samples.  相似文献   
5.
Book Review     
《Expert Systems》2002,19(1):53-55
  相似文献   
6.
The influence of NaCl and CO2 on the atmospheric corrosion of magnesium alloy AZ91 is studied in the laboratory. Samples were exposed under carefully controlled air and flow conditions; the relative humidity was 95%, the temperature was 22.0°C and the concentration of CO2 was < 1 ppm or 350 ppm. Different amounts of sodium chloride (0–70 μg/cm2) were added before exposure. The corrosion products were analyzed by gravimetry, ion chromatography, X‐ray diffraction and scanning electron microscopy. Mass gain and metal loss results are reported. The combination of high humidity and NaCl is very corrosive towards AZ91. However, the NaCl‐induced corrosion is inhibited by ambient concentrations of CO2. Exposure in the absence of CO2 gives rise to heavy pitting, with brucite, Mg(OH)2, being the dominant corrosion product. In the presence of CO2 a layer of hydrated magnesium hydroxy carbonate, Mg5(CO3)4(OH)2 · 5 H2O forms. A tentative corrosion mechanism is presented that explains the behavior in the two environments.  相似文献   
7.
在现代社会中,平板电脑、智能手机在人们日常生活的方方面面发挥着巨大的作用。通过分析电子产品在儿童和青少年的视力、身体发育、社交能力和学习能力等方面的负面影响,提出了加强亲子陪伴、合理引导控制等应对措施。  相似文献   
8.
为保证电镀塑料制品的质量,提出了符合电镀要求的塑料制品设计原则,并且指出在注塑成形时,对塑料经过充分干燥,采用较高的注塑温度,较低的注射压力和较慢的注射速度,是使镀层获得良好结合强度的先决条件。  相似文献   
9.
随着社会主义的不断完善,在企业的经营决策中,产品的价格确定是一个十分重要的内容.售价决策正确与否,直接关系到企业经济效益的好坏.本文对产品定价的方法作一探讨,试图找到一种对企业来说比较实用的方法.  相似文献   
10.
介绍了涟钢CSP产品的现状及其性能。为调整产品结构,提高企业的市场竞争能力,提出了未来开发CSP板带材产品的几点建议。  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