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   5408篇
  免费   702篇
  国内免费   311篇
电工技术   131篇
综合类   274篇
化学工业   1107篇
金属工艺   809篇
机械仪表   423篇
建筑科学   89篇
矿业工程   59篇
能源动力   92篇
轻工业   181篇
水利工程   20篇
石油天然气   455篇
武器工业   41篇
无线电   689篇
一般工业技术   722篇
冶金工业   382篇
原子能技术   199篇
自动化技术   748篇
  2024年   15篇
  2023年   55篇
  2022年   126篇
  2021年   126篇
  2020年   141篇
  2019年   155篇
  2018年   168篇
  2017年   261篇
  2016年   265篇
  2015年   261篇
  2014年   327篇
  2013年   321篇
  2012年   382篇
  2011年   394篇
  2010年   324篇
  2009年   351篇
  2008年   305篇
  2007年   348篇
  2006年   346篇
  2005年   251篇
  2004年   204篇
  2003年   225篇
  2002年   209篇
  2001年   207篇
  2000年   146篇
  1999年   124篇
  1998年   129篇
  1997年   80篇
  1996年   47篇
  1995年   26篇
  1994年   29篇
  1993年   7篇
  1992年   20篇
  1991年   7篇
  1990年   8篇
  1989年   2篇
  1988年   4篇
  1987年   5篇
  1986年   3篇
  1985年   1篇
  1984年   4篇
  1983年   2篇
  1982年   5篇
  1981年   2篇
  1980年   1篇
  1974年   1篇
  1973年   1篇
排序方式: 共有6421条查询结果,搜索用时 15 毫秒
1.
Experimental and theoretical studies are performed in order to illuminate, for first time, the intercalation mechanism of polycyclic aromatic molecules into graphite oxide. Two representative molecules of this family, aniline and naphthalene amine are investigated. After intercalation, aniline molecules prefer to covalently connect to the graphene oxide matrix via chemical grafting, while napthalene amine molecules bind with the graphene oxide surface through π–π interactions. The presence of intercalated aromatic molecules between the graphene oxide layers is demonstrated by X‐ray diffraction, while the type of interaction between graphene oxide and polycyclic organic molecules is elucidated by X‐ray photoelectron spectroscopy. Combined quantum mechanical and molecular mechanical calculations describe the intercalation mechanism and the aniline grafting, rationalizing the experimental data. The present work opens new perspectives for the interaction of various aromatic molecules with graphite oxide and the so‐called “intercalation chemistry”.  相似文献   
2.
X5045电路及其应用   总被引:8,自引:0,他引:8  
X5045是一种集看门狗、电压监控和串行EEPROM三种功能于一身的可编程控制电路,文中介绍了它的主要特点和工作原理,同时结合8051单片机给出了MPU与X5045的接口电路与相应的读写程序。  相似文献   
3.
DSP与PC间的数据通讯   总被引:1,自引:0,他引:1  
DSP由于具有高性能和灵活可编程的优点而得到广泛的应用。文章给出了用PC机作主机 ,DSP作从机来实现DSP与PC机间有效、可靠通讯的实现方法。同时通过一个数据传输程序的例子来详细阐述如何使用VB6.0专业版作为开发工具 ,并利用DSP中的SCI(SerialCommunicationInter face)模块来实现DSP与微机间的数据传递方法。  相似文献   
4.
A hybrid numerical method for modelling the evolution of sharp phase interfaces on fixed grids is presented. We focus attention on two‐dimensional solidification problems, where the temperature field evolves according to classical heat conduction in two subdomains separated by a moving freezing front. The enrichment strategies of the eXtended Finite Element Method (X‐FEM) are employed to represent the jump in the temperature gradient that governs the velocity of the phase boundary. A new approach with the X‐FEM is suggested for this class of problems whereby the partition of unity is constructed with C1(Ω) polynomials and enriched with a C0(Ω) function. This approach leads to jumps in temperature gradient occurring only at the phase boundary, and is shown to significantly improve estimates for the front velocity. Temporal derivatives of the temperature field in the vicinity of the phase front are obtained with a projection that employs discontinuous enrichment. In conjunction with a finer finite difference grid, the Level Set method is used to represent the evolution of the phase interface. An iterative procedure is adopted to satisfy the constraints on the temperature field on the phase boundary. The robustness and utility of the method is demonstrated with several benchmark problems of phase transformation. Copyright © 2002 John Wiley & Sons, Ltd.  相似文献   
5.
Due to clearly distinguishable damage symptoms, it is differentiated between the surface and sub‐surface failure mode of rolling bearings. Material states red out by X‐ray diffraction (XRD) residual stress measurements point to a variety of loading conditions especially at raceway surfaces that are associated with several competing failure mechanisms. The corresponding lifetime reduction can range from the lower fatigue strength region to material ratcheting in extreme cases. Relevant position of the microstructural changes and nature of the failure mechanisms are characterized. The time alteration of the XRD material parameters measured at or near the surface and at the depth of the maximum equivalent stress correlates, in a different manner, with the statistical parameter of the 10 % bearing life. Both failure modes are illustrated by concrete examples. Contaminated lubricant and boundary lubrication, which represent practically important surface‐induced failures, are discussed in more detail. Gray staining, i.e. shallow pitting, often occurs without distinct indication of global material aging by means of XRD characteristics. Here, scanning electron microscopy observations and electron microprobe analyses point to corrosion fatigue as acting surface failure mechanism. The interaction between material and lubricant under complex loading regimes particularly of mixed friction and corrosion opens further failure research areas in the field of tribology.  相似文献   
6.
The thermal expansion of a titanium modified, swelling resistant austenitic stainless steel designated as D9 is studied by measuring the lattice parameter as a function of temperature in the range 300-1300 K by high-temperature X-ray diffraction technique. The thermal expansion data thus obtained is in reasonable agreement with the typical thermal expansion values reported for similar nuclear grade austenitic stainless steels. However, at temperatures exceeding 900 K, the measured thermal expansivity exhibits a pronounced non-linear increase due partly to the precipitation of complex carbide and intermetallic phases. The high-temperature thermal expansion data obtained in the present study are augmented by modelling the low-temperature thermal expansion behaviour by Grüneisen formalism.  相似文献   
7.
简要介绍黑龙江联通CDMA的网络结构、建网原则及CDMA 1X网的主要业务。  相似文献   
8.
本文介绍了ISDN用户一网络接口的管理模型,分析了PBX、X.25网关的管理功能,对协议测试,管理通信进行了研究并提出模型及实现原则。  相似文献   
9.
An existing extensive database on the isothermal and thermomechanical fatigue behaviour of high-temperature titanium alloy EVII 834 and dispersoid-strengthened aluminum alloy X8019 in SiC particle-reinforced as well as unreinv conditions was used to evaluate both the adaptability of fracture mechanics approaches to TMF and the resulting predictive capabilities of determining material life by crack propagation consideration. Selection of the correct microstructural concepts was emphasised and these concepts were, then adjusted by using data from independent experiments in order to avoid any sort of fitting. It is shown that the cyclic /-integral (δJeff concept) is suitable to predict the cyclic lifetime for conditions where the total crack propagation rate is approximately identical to pure fatigue crack growth velocity. In the case that crack propagation is strongly affected by creep, the creep-fatigue damage parameter δCF introduced by Riedel can be successfully applied. If environmental effects are very pronounced, the accelerating influence of corrosion on fatigue crack propagation can no longer implicitly be taken into account in the fatigue crack growth law. Instead, a linear combination of the crack growth rate contributions from plain fatigue (determined in vacuum) and from environmental attack is assumed and found to yield a satisfactory prediction, if the relevant corrosion process is taken into account.  相似文献   
10.
多相物质粉末衍射的物相检索   总被引:1,自引:1,他引:0  
讨论了多相物质粉末衍射的物相检索问题,介绍了XRDS的物相检索软件。这是一种智能型的物相检索程序,考虑了测试数据的不确定度,以及粉末样品和块状样品衍射图谱各自的特点,不仅注意到实际样品中微量物相存在的可能,也注意到块状样品结构有序性的可能。XRDS能够帮助材料工作者同时检出样品中所含的多种物相及其含量,操作简单、结果可靠。  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