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   142989篇
  免费   8576篇
  国内免费   4310篇
电工技术   6521篇
技术理论   8篇
综合类   12179篇
化学工业   11761篇
金属工艺   5947篇
机械仪表   15593篇
建筑科学   28937篇
矿业工程   4175篇
能源动力   3142篇
轻工业   9342篇
水利工程   3683篇
石油天然气   4742篇
武器工业   1518篇
无线电   8737篇
一般工业技术   16815篇
冶金工业   3598篇
原子能技术   823篇
自动化技术   18354篇
  2024年   510篇
  2023年   1473篇
  2022年   2413篇
  2021年   3219篇
  2020年   3374篇
  2019年   2730篇
  2018年   2665篇
  2017年   3333篇
  2016年   3771篇
  2015年   3981篇
  2014年   9918篇
  2013年   8200篇
  2012年   10037篇
  2011年   10647篇
  2010年   9031篇
  2009年   9331篇
  2008年   8287篇
  2007年   10067篇
  2006年   8624篇
  2005年   7533篇
  2004年   6193篇
  2003年   5774篇
  2002年   4648篇
  2001年   3897篇
  2000年   3184篇
  1999年   2527篇
  1998年   2025篇
  1997年   1697篇
  1996年   1420篇
  1995年   1127篇
  1994年   915篇
  1993年   663篇
  1992年   548篇
  1991年   447篇
  1990年   296篇
  1989年   293篇
  1988年   206篇
  1987年   153篇
  1986年   90篇
  1985年   100篇
  1984年   128篇
  1983年   89篇
  1982年   95篇
  1981年   34篇
  1980年   43篇
  1979年   29篇
  1978年   13篇
  1977年   11篇
  1975年   8篇
  1959年   14篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
谢睿 《日用化学品科学》2003,26(3):31-31,33
美白产品始终是夏季护肤品市场竞争的焦点,旁氏推出“日夜美白不停顿”的新概念以应对传统美白产品的挑战,并利用策略发展和广告创意的源动力——“消费者洞察力”概念推出了一套精准的传播策略和创意出色的广告,对消费者产生了很强的吸引力。  相似文献   
992.
In the present paper, we investigate the output-controllability and optimal output control problems of a state-dependent switched Boolean control network. By using the semi-tensor product, the algebraic form of the system is obtained. Then, output-controllability problems of the system are discussed and some necessary and sufficient conditions are given. Next, the Mayer-type optimal output control issue is considered and an algorithm is provided to find out the control sequence. At last, an example is given to show the effectiveness of the main results.  相似文献   
993.
We present a simple and fast algorithm to test the thermodynamic stability and determine the necessary chemical environment for the production of a multiternary material, relative to competing phases and compounds formed from the constituent elements. If the material is found to be stable, the region of stability, in terms of the constituent elemental chemical potentials, is determined from the intersection points of hypersurfaces in an (n−1)(n1)-dimensional chemical potential space, where nn is the number of atomic species in the material. The input required is the free energy of formation of the material itself, and that of all competing phases. Output consists of the result of the test of stability, the intersection points in the chemical potential space and the competing phase to which they relate, and, for two- and three-dimensional spaces, a file which may be used for visualization of the stability region. We specify the use of the program by applying it both to a ternary system and to a quaternary system. The algorithm automates essential analysis of the thermodynamic stability of a material. This analysis consists of a process which is lengthy for ternary materials, and becomes much more complicated when studying materials of four or more constituent elements, which have become of increased interest in recent years for technological applications such as energy harvesting and optoelectronics. The algorithm will therefore be of great benefit to the theoretical and computational study of such materials.  相似文献   
994.
Prior research suggests that ergonomics work design and mixed teams (in age and gender) may compensate declines in certain abilities of ageing employees. This study investigates simultaneous effects of both team level factors on absenteeism and performance (error rates) over one year in a sample of 56 car assembly teams (N = 623). Results show that age was related to prolonged absenteeism and more mistakes in work planning, but not to overall performance. In comparison, high-physical workload was strongly associated with longer absenteeism and increased error rates. Furthermore, controlling for physical workload, age diversity was related to shorter absenteeism, and the presence of females in the team was associated with shorter absenteeism and better performance. In summary, this study suggests that both ergonomics work design and mixed team composition may compensate age-related productivity risks in manufacturing by maintaining the work ability of older employees and improving job quality.  相似文献   
995.
由成都建筑材料工业设计研究院有限公司(简称成都院)和中国建材装备有限公司组成联合体总承包的UCC 10 000 t/d熟料水泥生产线,成都院负责提供合同范围内所有的工程设计、核心技术及核心设备、现场管理、人员培训、生产线达标考核,并具体负责实施和完成所有的土建及安装工程。在总承包工程建设的过程管理中,成都院以设计为灵魂,贯彻了"工艺流程顺畅,总图布局合理,系统配置先进可靠,合理节省投资"的设计理念;成都院克服了要求高、工期短、气候条件恶劣、国外施工人员管理难度大、功效低等重重困难,按时、保质保量、安全地完成了土建、安装、调试和试车任务;2007年4月26日,该生产线一次性通过业主的达标考核。我们的经验是:(1)有专业设计院全面介入的工程总承包是项目顺利进行的可靠保证;(2)参与建设的相关单位要相互信任、相互配合、目标一致;(3)工程建设管理科学化、人性化很重要。该项目的成功建设,使成都院总包工程建设的过程管理更加正规化、合理化和科学化。  相似文献   
996.
ContextAdvances in customization have highlighted the need for tools supporting variable content document management and generation in many domains. Current tools allow the generation of highly customized documents that are variable in both content and layout. However, most frameworks are technology-oriented, and their use requires advanced skills in implementation-related tools, which means their use by end users (i.e. document designers) is severely limited.ObjectiveStarting from past and current trends for customized document authoring, our goal is to provide a document generation alternative in which variants are specified at a high level of abstraction and content reuse can be maximized in high variability scenarios.MethodBased on our experience in Document Engineering, we identified areas in the variable content document management and generation field open to further improvement. We first classified the primary sources of variability in document composition processes and then developed a methodology, which we called DPL – based on Software Product Lines principles – to support document generation in high variability scenarios.ResultsIn order to validate the applicability of our methodology we implemented a tool – DPLfw – to carry out DPL processes. After using this in different scenarios, we compared our proposal with other state-of-the-art tools for variable content document management and generation.ConclusionThe DPLfw showed a good capacity for the automatic generation of variable content documents equal to or in some cases surpassing other currently available approaches. To the best of our knowledge, DPLfw is the only framework that combines variable content and document workflow facilities, easing the generation of variable content documents in which multiple actors play different roles.  相似文献   
997.
非线性有限元正交设计算法,是借助于回归分析,用正交多项式拟合各岩石力学特性参数与各单元滑移面及岩体整体滑动安全余量间的函数关系,以评判边坡工程的可靠性。该法较蒙特卡罗法精度高,能满足工程计算的精度要求,且方法简单、计算时间少,不需改变有限元法的有关方程和计算程序,易为人们接受。  相似文献   
998.
假性紫罗兰酮在浓硫酸及 - 2 0°C低温条件下反应 ,主要生成 β-紫罗兰酮 ,少量的 α-及 γ-紫罗兰酮 ,同时生成副产物 ( I)及 ( II)。用 IR、1H NMR及 MS光谱分析方法 ,对副产物 ( I)进行了结构鉴定 ,结构为 3,4,4a,5 ,8,8a-六氢 - 2 ,5 ,5 ,8a-四甲基 - 2 H - 1 -苯并吡喃  相似文献   
999.
应用锁扣装置、组合拉杆结构,减少导柱数量,简化了多点多板多分型面注塑模具的设计。  相似文献   
1000.
介绍了通径为20"(1"=25.4mm)的大口径中压球阀阀体、新型C形金属密封环组件等的结构设计;在阀座与球体之间采用整体碟形弹簧和新型阀座密封填料,以保证高压密封,提高使用寿命;阀芯采用空心球体结构和分段冲压成形加工工艺,有效地保证了球体的加工精度和质量,降低了生产成本;在结构设计中,充分考虑了球阀的密封、防火、启闭传动及制造工艺的要求;对其中结构复杂的球阀阀体和空心球形阀芯进行了强度计算和ANSYS应力、应变模拟分析计算,二者计算结果一致,并认为阀体的厚度由其大开孔处局部应力的整体补强确定。  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