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   18728篇
  免费   2016篇
  国内免费   1245篇
电工技术   1554篇
技术理论   4篇
综合类   2101篇
化学工业   1642篇
金属工艺   2341篇
机械仪表   1096篇
建筑科学   1233篇
矿业工程   908篇
能源动力   475篇
轻工业   498篇
水利工程   314篇
石油天然气   428篇
武器工业   182篇
无线电   1869篇
一般工业技术   2239篇
冶金工业   1304篇
原子能技术   94篇
自动化技术   3707篇
  2025年   150篇
  2024年   382篇
  2023年   370篇
  2022年   516篇
  2021年   647篇
  2020年   640篇
  2019年   536篇
  2018年   451篇
  2017年   536篇
  2016年   582篇
  2015年   733篇
  2014年   1219篇
  2013年   1133篇
  2012年   1348篇
  2011年   1430篇
  2010年   1057篇
  2009年   1055篇
  2008年   924篇
  2007年   1197篇
  2006年   1080篇
  2005年   891篇
  2004年   719篇
  2003年   645篇
  2002年   541篇
  2001年   452篇
  2000年   440篇
  1999年   340篇
  1998年   296篇
  1997年   293篇
  1996年   235篇
  1995年   211篇
  1994年   213篇
  1993年   122篇
  1992年   122篇
  1991年   114篇
  1990年   99篇
  1989年   93篇
  1988年   60篇
  1987年   25篇
  1986年   14篇
  1985年   16篇
  1984年   14篇
  1983年   9篇
  1982年   10篇
  1981年   9篇
  1980年   7篇
  1979年   4篇
  1976年   2篇
  1953年   3篇
  1951年   1篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
研究了稳定ZrO_2和部份稳定ZrO_2对β″-Al_2O_3陶瓷的强化和韧化作用,观察了不同种类、不同含量的ZrO_2对β″-Al_2O_3陶瓷的显微结构、力学性能和电导率的影响,探讨了β″-Al_2O_3的韧化机理。  相似文献   
2.
A method is presented for computing the values of apparent diffusivity in solids with respect to the concentration of the diffusing substance (water or sodium chloride). This method does not require any assumption upon the mathematical relationship between diffusivity and concentration. It can be applied to experimental measurements of local concentration versus position within the solid (profiles) with relatively few measurements (circa 10) and a mathematical smoothing of the experimental data by using an artificial neural network model. The method was first validated on simulated data obtained by using a constant diffusivity value and on experimental profiles when the relation between diffusivity and concentration was given. It was then applied to original experimental moisture profiles obtained by putting gelatin gels with different initial moisture contents into contact for up to 14 days. The method was also successfully applied to five sets of experimental moisture and sodium chloride profiles taken from the literature and obtained from different food products. Apparent diffusivities calculated by our method were found in agreement with those obtained by authors using different numerical methods to compute the diffusivity values.  相似文献   
3.
彭发云 《铸造技术》2004,25(10):785-787
用呋喃树脂石英砂工艺生产牵引电机换向器套筒出现变形、裂纹等铸造缺陷,是由石英砂相变膨胀引起,后用高铬刚玉砂代替石英砂得到解决.  相似文献   
4.
The aluminated sepiolite, obtained by alkaline treatment with KAlO2, as well as the silver-exchanged aluminated sepiolite were tested in ethanol conversion. The reactions were performed at 280°C and with 50 Torr of ethanol in He. After the alumination through KA1O2, ethanol dehydrogenation and ethanol dehydration resulted from the Lewis acidity. The dispersion of silver led to a bifunctional catalytic system and the overall catalytic activity and the selectivity towards the acetaldehyde production increased. As a result of the Prins reaction, a significant yield in butadiene was observed.  相似文献   
5.
Santosh D. Wanjale 《Polymer》2006,47(18):6414-6421
Poly(1-butene)/MWCNT nanocomposites were prepared by simple melt processing technique. Crystallization, crystal-to-crystal phase transformation and spherulitic morphology were studied using differential scanning calorimetry (DSC), wide angle X-ray diffraction (WAXD) and optical microscopy (OM). The non-isothermal crystallization exhibited higher values of Zt derived from Avrami theory and lower values of F(T) obtained from Avrami-Ozawa analysis, while the isothermal crystallization revealed a significant increase in crystallization temperatures and lower crystallization half times compared to pristine PB. The observed changes in the crystallization kinetics were ascribed to the enhanced nucleation of PB in the presence of MWCNT. The nucleating activity calculated from the non-isothermal crystallization data revealed that the MWCNTs provide an active surface for the nucleation of PB. The optical micrographs exhibited significantly smaller crystallites with disordered morphology for the nanocomposites compared to the well defined spherulitic morphology for pristine PB. The rate of phase transformation from kinetically favored tetragonal to thermodynamically stable hexagonal form was noticeably enhanced as evidenced by the reduction in the half time for phase transformation from 58 h to 25 h for PB reinforced with 7% MWCNT.  相似文献   
6.
针对重力测定反问题,提出将其离散为线性不适定问题,利用小波变换方法进行数值求解.该方法将小波变换和正则化方法相结合,选取小波函数作为一组基底,将原不适定问题转化为粗子空间上的适定问题,并给出选取粗子空间基的方法.通过数值模拟已有方法和小波变换方法求解结果的比较,表明了小波变换方法的可行性和有效性.  相似文献   
7.
当前,高职院校科研工作发展迅速,但是往往"重研究,轻应用",科研成果转化数量少,这是一种资源的浪费。高职院校科研成果转化具有重要的现实意义,应该得到大力发展。文章分析了当前高职院校科研成果转化存在的问题,提出了促进高职院校科研成果转化的对策建议。  相似文献   
8.
In shape memory materials,that have been trained to have a two way shape memory effect(TWSM),themartensitic variants are classified into two groups,i.e.,preferentially oriented variants and self-accommodatingvariants.Applied stress may promote or constrain the transition of preferentially oriented variants and so changetransformation temperatures but has no essential effect on self-accommodating variants.According to the pointof view mentioned above,some experimental phenomena during thermocycling of a TWSM device may be ex-plained,such as the absence of synchronization between the plot of resistance change.temperature and the plotof memory strain vs.temperature.  相似文献   
9.
Iwata 《Algorithmica》2008,36(4):331-341
   Abstract. This paper presents a new algorithm for computing the maximum degree δ k (A) of a minor of order k in a matrix pencil A(s) . The problem is of practical significance in the field of numerical analysis and systems control. The algorithm adopts a general framework of ``combinatorial relaxation' due to Murota. It first solves the weighted bipartite matching problem to obtain an estimate
on δ k (A) , and then checks if the estimate is correct, exploiting the optimal dual solution. In case of incorrectness, it modifies the matrix pencil A(s) to improve the estimate
without changing δ k (A) . The present algorithm performs this matrix modification by an equivalence transformation with constant matrices, whereas the previous one uses biproper rational function matrices. Thus the present approach saves memory space and reduces the running time bound by a factor of rank A .  相似文献   
10.
This paper presents new a feature transformation technique applied to improve the screening accuracy for the automatic detection of pathological voices. The statistical transformation is based on Hidden Markov Models, obtaining a transformation and classification stage simultaneously and adjusting the parameters of the model with a criterion that minimizes the classification error. The original feature vectors are built up using classic short-term noise parameters and mel-frequency cepstral coefficients. With respect to conventional approaches found in the literature of automatic detection of pathological voices, the proposed feature space transformation technique demonstrates a significant improvement of the performance with no addition of new features to the original input space. In view of the results, it is expected that this technique could provide good results in other areas such as speaker verification and/or identification.  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