全文获取类型
收费全文 | 33359篇 |
免费 | 3115篇 |
国内免费 | 1561篇 |
专业分类
电工技术 | 1442篇 |
技术理论 | 11篇 |
综合类 | 3175篇 |
化学工业 | 4958篇 |
金属工艺 | 1737篇 |
机械仪表 | 1620篇 |
建筑科学 | 5069篇 |
矿业工程 | 2041篇 |
能源动力 | 1301篇 |
轻工业 | 2262篇 |
水利工程 | 1976篇 |
石油天然气 | 1662篇 |
武器工业 | 630篇 |
无线电 | 902篇 |
一般工业技术 | 4184篇 |
冶金工业 | 2674篇 |
原子能技术 | 365篇 |
自动化技术 | 2026篇 |
出版年
2024年 | 61篇 |
2023年 | 468篇 |
2022年 | 913篇 |
2021年 | 1267篇 |
2020年 | 1209篇 |
2019年 | 968篇 |
2018年 | 938篇 |
2017年 | 1008篇 |
2016年 | 1200篇 |
2015年 | 1284篇 |
2014年 | 2396篇 |
2013年 | 2409篇 |
2012年 | 2466篇 |
2011年 | 2659篇 |
2010年 | 2059篇 |
2009年 | 1956篇 |
2008年 | 1670篇 |
2007年 | 2128篇 |
2006年 | 1925篇 |
2005年 | 1618篇 |
2004年 | 1353篇 |
2003年 | 1097篇 |
2002年 | 986篇 |
2001年 | 802篇 |
2000年 | 610篇 |
1999年 | 488篇 |
1998年 | 363篇 |
1997年 | 299篇 |
1996年 | 222篇 |
1995年 | 220篇 |
1994年 | 189篇 |
1993年 | 116篇 |
1992年 | 111篇 |
1991年 | 78篇 |
1990年 | 85篇 |
1989年 | 52篇 |
1988年 | 46篇 |
1987年 | 28篇 |
1986年 | 34篇 |
1985年 | 27篇 |
1984年 | 22篇 |
1983年 | 29篇 |
1982年 | 33篇 |
1980年 | 11篇 |
1966年 | 10篇 |
1964年 | 15篇 |
1960年 | 8篇 |
1959年 | 8篇 |
1957年 | 10篇 |
1955年 | 8篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
腾冲市茨竹地铁多金属矿现目前是一座正在开采的以磁铁矿为主、共(伴)生锡钨矿的小型矿山。为了增加矿山资源储量、延长矿山服务年限,通过对矿区的地质特征阐述和对矿区地层岩性、构造、岩体等控矿因素的分析研究,总结了矿区成矿规律并形成了矿区的成矿模式,为矿区深部探矿、外围找矿提供了一定的理论依据。 相似文献
22.
Siddhartha Sankar Mandal K. S. Ghosh 《International Journal of Cast Metals Research》2018,31(3):177-192
Destabilisation of as-cast chromium white iron with 16 wt-% chromium are performed by continuous destabilisation treatment for 4 h and short duration (0.66 h) cyclic destabilisation treatment at 900, 950, 1000, 1050, and 1100 °C. Continuous destabilisation causes secondary carbides precipitation from austenite which on slow cooling transforms to pearlite matrix. Cyclic destabilisation treatment causes similar precipitation of finer secondary carbides following shorter period austenitisation and a matrix containing martensite and retained austenite on forced-air cooling. After continuous destabilisation, hardness falls below the as-cast value (HV622); whereas it rises to HV950 after cyclic destabilisation treatment. The as-cast notched impact toughness (4.0 J) increases to 8.5 J or more after both continuous and cyclic destabilisation at 1050 and 1100 °C. Abrasive wear resistance after continuous destabilisation improves only at higher wear load (49.0 N), while after cyclic destabilisation it supersedes the as-cast and Ni-Hard IV performance at both low (19.6 N) and high (49.9 N) wear load. 相似文献
23.
Lean practices are known to increase operational performance. Previous research has identified critical success factors for implementing lean practices. This research aims to examine the extent to which success factors are critical for various degrees of lean practice implementation. Using multiple-respondent self-assessments from 33 Dutch manufacturing small and medium-sized enterprises (SMEs), we conducted a Necessary Condition Analysis. Our findings indicated that the criticality of success factors is progression dependent. In the initial stages of the lean journey, SMEs could improve their lean practices in a bottom-up manner through local factors such as a learning focus, improvement training and support congruence. When lean practices are more advanced, some company-wide factors must be present: top management support, a shared improvement vision and a supplier link. Our findings question the universality of success factors such as strategic involvement and indicate the need for a more dynamic model of lean implementation. 相似文献
24.
Wenhao Qiu Guangyao Lian Peng Zhou Kaoli Huang 《Quality and Reliability Engineering International》2020,36(5):1592-1603
An extended failure mode effect and criticality analysis (FMECA)-based sample allocation method for testability verification is presented in this study to deal with the poor representativeness of test sample sets and the randomness of the testability evaluation results caused by unreasonable selection of failure samples. First, the fault propagation intensity is introduced as part of the extended information of FMECA, and the sample allocation impact factors of component units and failure modes are determined under this framework. Then, the failure mode similarity and impact factor support are defined, and the game decision method for weighing the relationship between similarity and support is proposed to obtain the weight of failure mode impact factor. Finally, a two-step allocation framework of test samples is formulated to realize the sample allocation of component units and failure modes. This method is applied to the testability verification test of a launch control system. Results show that this method can obtain more representative test samples compared with the traditional sample allocation method while effectively reducing randomness of single testability evaluation result. 相似文献
25.
26.
27.
The stochastic response of frictionally damped strongly non-linear elastic impact oscillator subjected to white noise excitation and its stochastic bifurcation are considered. By the stochastic averaging method based on generalized harmonic function, one can obtain the stationary probability density function of this system. The effects of system parameters on the responses are investigated and the analytical results were verified by comparing with numerical results from Monte Carlo simulations. Stochastic bifurcations are discussed through a qualitative change of the stationary probability distribution, which indicates that the coefficient of friction, damping constant of the elastic impact force respectively, can be treated as bifurcation parameters. 相似文献
28.
针对尾撑式风洞模型强方向性振动问题,基于异位配置加速度负反馈控制器对风洞模型振动主动控制方法进行研究。首先,通过模态分析得到系统低阶模态振动的强方向性并基于系统特性设计了具有结构耦合性的内嵌压电陶瓷作动器的风洞模型振动主动控制系统。然后,基于异位配置NAF控制器分别设计了针对第二阶模态和前两阶模态的单模态NAF控制算法和双模态NAF控制算法。最后,进行了实验验证,结果表明:双模态NAF控制算法控制效果较好,前两阶模态阻尼比分别提高近13倍和近40倍,镇定时间分别缩短近11s和近26s。 相似文献
29.
Debadyuti Das 《国际生产研究杂志》2018,56(17):5776-5794
The present work is an attempt to investigate the adoption of sustainable supply chain management (SSCM) practices amongst manufacturing and process based organisations in India and its impact on organisational performance encompassing all three dimensions of sustainability. SSCM practices conceived in the present study include environmental management practices (EMP), socially inclusive practices for employees (SPE), socially inclusive practices for community (SPC), operations practices (OP) and supply chain integration (SCI) which were treated as exogenous variables. Organisational performance considered in this study includes five dimensions, namely environmental performance (EPR), employee-centred social performance (ESP), community-centred social performance (CSP), operations performance (OPR) and competitiveness, which were regarded as endogenous variables. The analysis was carried out with the help of structural equation modelling considering natural logarithm of manpower as a control variable. Few major findings are mentioned. EMP does not have any significant association with OPR, nor does it result in competitiveness. However, when jointly mediated through both EPR and OPR, EMP leads to competitiveness. SPC has significant negative association with competitiveness, when only direct relationship is considered. However, indirect relationship between SPC and competitiveness shows significant positive association when mediated through CSP. The resultant total effect between SPC and competitiveness turns out to be insignificant. Further, OPR fully mediates the relationship between OP and competitiveness. Managerial implications of the findings are discussed. 相似文献
30.
污泥生物炭中氮硫元素含量高,其氮硫行为和环境效应对全球气候变化的影响不容忽视。以往的研究中,研究者往往以富碳生物炭作为主要研究对象,关注碳对全球气候变化的行为和功效,而对氮硫元素的作用关注不够。本文从原始污泥基本性质到其热解过程,再到生物炭的老化,逐步对污泥生物炭整个生命周期内氮硫的行为及其环境效应研究进行综述,并对未来应注重开展的研究方向进行展望,为生物炭中氮硫元素固定、释放及与之关联的环境效应和温室气体排放控制研究提供理论基础。分析表明,污泥中氮元素含量普遍高于硫元素,且热解过程中氮比硫更容易转移至气相产物。氮硫元素随热解温度的增加,在三相产物中的分配都是炭中持续减少,油中先增后减,气中一直增加。高温(>800℃)条件下,气相中的氮含量高于固相,而硫元素则仍然主要存在于固相中。污泥生物炭老化及其环境效应研究表明,污泥生物炭氮硫元素与土壤的相互作用及其温室效应问题在今后的研究中应引起重视。 相似文献