全文获取类型
收费全文 | 6618篇 |
免费 | 1023篇 |
国内免费 | 705篇 |
专业分类
电工技术 | 1610篇 |
综合类 | 700篇 |
化学工业 | 897篇 |
金属工艺 | 191篇 |
机械仪表 | 229篇 |
建筑科学 | 386篇 |
矿业工程 | 115篇 |
能源动力 | 277篇 |
轻工业 | 606篇 |
水利工程 | 151篇 |
石油天然气 | 261篇 |
武器工业 | 40篇 |
无线电 | 612篇 |
一般工业技术 | 451篇 |
冶金工业 | 172篇 |
原子能技术 | 56篇 |
自动化技术 | 1592篇 |
出版年
2024年 | 28篇 |
2023年 | 121篇 |
2022年 | 224篇 |
2021年 | 255篇 |
2020年 | 254篇 |
2019年 | 226篇 |
2018年 | 199篇 |
2017年 | 253篇 |
2016年 | 305篇 |
2015年 | 309篇 |
2014年 | 424篇 |
2013年 | 478篇 |
2012年 | 570篇 |
2011年 | 537篇 |
2010年 | 360篇 |
2009年 | 402篇 |
2008年 | 401篇 |
2007年 | 442篇 |
2006年 | 381篇 |
2005年 | 337篇 |
2004年 | 295篇 |
2003年 | 208篇 |
2002年 | 207篇 |
2001年 | 201篇 |
2000年 | 142篇 |
1999年 | 145篇 |
1998年 | 83篇 |
1997年 | 73篇 |
1996年 | 73篇 |
1995年 | 76篇 |
1994年 | 59篇 |
1993年 | 61篇 |
1992年 | 43篇 |
1991年 | 31篇 |
1990年 | 27篇 |
1989年 | 22篇 |
1988年 | 12篇 |
1987年 | 8篇 |
1986年 | 10篇 |
1985年 | 11篇 |
1984年 | 4篇 |
1983年 | 3篇 |
1982年 | 9篇 |
1981年 | 5篇 |
1980年 | 6篇 |
1979年 | 4篇 |
1978年 | 4篇 |
1977年 | 6篇 |
1965年 | 2篇 |
1960年 | 2篇 |
排序方式: 共有8346条查询结果,搜索用时 15 毫秒
1.
Dr. Ying Wang Prof. Dr. Andrew Ewing 《Chembiochem : a European journal of chemical biology》2021,22(5):807-813
Exocytosis plays an essential role in the communication between cells in the nervous system. Understanding the regulation of neurotransmitter release during exocytosis and the amount of neurotransmitter content that is stored in vesicles is of importance, as it provides fundamental insights to understand how the brain works and how neurons elicit a certain behavior. In this minireview, we summarize recent progress in amperometric measurements for monitoring exocytosis in single cells and electrochemical cytometry measurements of vesicular neurotransmitter content in individual vesicles. Important steps have increased our understanding of the different mechanisms of exocytosis. Increasing evidence is firmly establishing that partial release is the primary mechanism of release in multiple cell types. 相似文献
2.
3.
4.
Polarity Effect and Electromagnetic Radiation of Partial Discharge Accompanying Growth of Electrical Tree 下载免费PDF全文
Tatsuya Mutakamihigashi Yoshito Kuroishi Hideki Ueno 《Electrical Engineering in Japan》2015,192(3):19-26
We have investigated the characteristics of radiated electromagnetic (EM) waves from positive and negative partial discharges (PD) in epoxy resin and cross‐linked polyethylene. We found that there is a correlation among the EM level from PD, the positive PD current, and electrical trees. Therefore, the growth of an electrical tree produces a lot of positive PD. We have also investigated the characteristics of the frequency region of EM waves from PD in air, insulating oil, and liquid epoxy in addition to the above insulators. EM waves were detected in the frequency region of 40 MHz to 300 MHz from positive and negative PD in epoxy resin and cross‐linked polyethylene. EM waves were also detected in the frequency region of 40 MHz to 150 MHz from positive and negative PD in air. In the case of insulating oil and liquid epoxy, EM waves were detected in the frequency regions of 40 MHz to 150 MHz from positive PD, and 40 MHz to 250 MHz from negative PD. The frequency region differed depending on the material and the discharge polarity. Our investigation indicates that the cause is differences in electric field strength at the time of PD occurrence. 相似文献
5.
针对车用柴油酸度等性质测定过程繁琐,采用衰减全反射样品池测定车用柴油的红外光谱,用偏最小二乘法(PLS)建立红外光谱测定车用柴油酸度、密度、闪点和凝点的4个校正模型,验证标准误差分别为0.46 mg/(100 mL),0.77kg/m3,2.60 ℃,2.77 ℃,该方法符合标准方法再现性要求。与标准方法相比,该方法具有无需预处理、操作简单、测量快速、重复性好等优点。 相似文献
6.
基于PC机群的大地电磁Occam反演并行计算研究 总被引:4,自引:0,他引:4
Occam反演以其稳定收敛和不依赖于初始模型的特性被广泛应用于大地电磁数据的处理,但偏导数矩阵的计算和拉格朗日乘子的求取导致大量的模型正演,使得反演速度较低。为此,研究了用基于PC机群的并行计算来解决这一问题的方法。首先对Occam反演方法进行了阐述;然后,分析了反演方法中各计算耗费的时间,提出对约占计算量90%的偏导数和拉格朗日乘子进行并行计算的思想,即偏导数计算采用频点计算一级的大粒度并行,拉格朗日乘子扫描和一维搜索分别采用弘值计算一级的大粒度并行和频点计算一级的小粒度并行;给出了并行计算的实现方法,即在PC机群上,利用主一从编程模式实现Occam反演的整体并行计算。在计算中,采用任务组合方式,减少了通信量,较好地实现了负载均衡。在4节点PC机群上,对应于拉格朗日乘子的扫描和一维搜索方式,整体加速比分别达到3.36和2.83。 相似文献
7.
本文提出了属性相关表这样一种新的概念,定义了相应的运算并研究了它的有关性质及定理,在此基础上提出了用属性相关表求关系模式全部主属性的等级,并给出了用主属性来组合关系模式全部候选关键字的算法,上述算法的时间复杂度均为O(n^2)。 相似文献
8.
9.
Yoshihiro Yajima 《时间序列分析杂志》1985,6(3):187-201
Abstract. We shall investigate the asymptotic behaviour of the sample autocorrelations and partial autocorrelations of a multiplicative ARIMA process and derive their limiting distributions. Some simulations are presented to illustrate the results obtained. 相似文献
10.
Y. Xiang Y. B. Zhao G. W. Wei 《International journal for numerical methods in engineering》2002,55(8):947-971
Part 2 of this series of two papers presents the applications of the discrete singular convolution (DSC) algorithm. The main purpose of this paper is to explore the utility, test the accuracy and examine the convergence of the proposed approach for the vibration analysis of rectangular plates with internal supports. Both partial internal line supports and complex internal supports are considered for 21 square plates of various combinations of edge support conditions. The effects of different size, shape and topology of the internal supports and different boundary conditions on the vibration response of plates are investigated. The partial internal line supports may vary from a central point support to a full range of cross or diagonal line supports. Several closed‐loop supports, such as ring, square and rhombus, and their combinations are studied for complex internal supports. Convergence and comparison studies are carried out to establish the correctness and accuracy of the DSC algorithm. The DSC results are compared with those in the available literature obtained by using other methods. Numerical results indicate that the DSC algorithm exhibits controllable accuracy for plate analysis and shows excellent flexibility in handling complex geometries, boundary conditions and support conditions. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献