全文获取类型
收费全文 | 223347篇 |
免费 | 18806篇 |
国内免费 | 12442篇 |
专业分类
电工技术 | 36565篇 |
技术理论 | 22篇 |
综合类 | 25366篇 |
化学工业 | 10288篇 |
金属工艺 | 7646篇 |
机械仪表 | 18959篇 |
建筑科学 | 18731篇 |
矿业工程 | 9191篇 |
能源动力 | 8266篇 |
轻工业 | 4771篇 |
水利工程 | 6873篇 |
石油天然气 | 6680篇 |
武器工业 | 3840篇 |
无线电 | 22108篇 |
一般工业技术 | 11457篇 |
冶金工业 | 6918篇 |
原子能技术 | 2295篇 |
自动化技术 | 54619篇 |
出版年
2024年 | 324篇 |
2023年 | 1908篇 |
2022年 | 3676篇 |
2021年 | 4976篇 |
2020年 | 5369篇 |
2019年 | 3873篇 |
2018年 | 3556篇 |
2017年 | 5146篇 |
2016年 | 6157篇 |
2015年 | 7310篇 |
2014年 | 14088篇 |
2013年 | 11913篇 |
2012年 | 16638篇 |
2011年 | 17596篇 |
2010年 | 13331篇 |
2009年 | 13404篇 |
2008年 | 13673篇 |
2007年 | 17538篇 |
2006年 | 15775篇 |
2005年 | 14168篇 |
2004年 | 11627篇 |
2003年 | 10542篇 |
2002年 | 8020篇 |
2001年 | 6726篇 |
2000年 | 5550篇 |
1999年 | 4425篇 |
1998年 | 3270篇 |
1997年 | 2654篇 |
1996年 | 2388篇 |
1995年 | 2045篇 |
1994年 | 1675篇 |
1993年 | 1151篇 |
1992年 | 960篇 |
1991年 | 693篇 |
1990年 | 554篇 |
1989年 | 469篇 |
1988年 | 336篇 |
1987年 | 191篇 |
1986年 | 113篇 |
1985年 | 126篇 |
1984年 | 110篇 |
1983年 | 98篇 |
1982年 | 77篇 |
1981年 | 67篇 |
1980年 | 53篇 |
1979年 | 48篇 |
1978年 | 35篇 |
1977年 | 28篇 |
1976年 | 24篇 |
1959年 | 20篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
51.
Mohammad Hossein
Abbasi Laura Iapichino Sajad Naderi Lordejani Wil Schilders Nathan van de Wouw 《International journal for numerical methods in engineering》2020,121(23):5178-5199
To circumvent restrictions of conventional drilling methods, such as slow control actions and inability to drill depleted reservoirs, a drilling method called managed pressure drilling (MPD) has been developed. In MPD, single-phase flow processes can be modeled as a feedback interconnection of a high-order linear system and a low-order nonlinear system. These nonlinearities appear locally both inside and at the boundaries of the computational domain. To obtain a fast simulation platform for real-time purposes (eg, online model-based controller implementation), model order reduction is required for MPD. However, the local nonlinearities render applying model order reduction techniques challenging. In this study, a new approach is proposed to deal with such nonlinearities within the reduced basis (RB) context and it is successfully tested on a model for MPD. Contrary to the classical RB technique, the proposed approach not only does not generate nonphysical spikes at the locations of these local nonlinearities but also yields high speedup factors. The obtained reduced-order model can be used for efficient online simulation and controller design for drilling systems with MPD. 相似文献
52.
目前对于青藏高原东北缘活动构造研究多集中于活动断裂带的活动性,而对夹持于其间的沉积盆地构造格架及活动性研究甚少。以夹持于烟筒山断裂与牛首山—罗山断裂之间的宁夏红寺堡盆地为研究对象,采用重力资料重处理解译、音频大地电磁测深(AMT)和地震勘探相结合,揭示红寺堡盆地隐伏构造特征,并进一步采用盆山一体化思路分析隐伏构造的成因机制及其对区域沙漠化的控制作用。结果表明:青藏高原在中新世末发生强烈的NE向推挤、扩展和隆升,红寺堡盆地由坳陷盆地转变为挠曲盆地; 在青藏高原NE向扩展的影响下,烟筒山断裂发生强烈的逆冲作用,古生代—中生代基底逆冲于古近系—新近系之上,受构造变形影响的最新地层为中新统彰恩堡组; 红寺堡盆地内的隐伏古隆起呈NW—SE向,与烟筒山构造带具有相同的构造动力学背景,受青藏高原NE向扩展影响形成于中新世末,并且至今仍具有活动性; 隐伏古隆起周缘断裂的活动破坏了地表稳定性、蓄水能力和地表植被,导致区域沙漠化呈现有规律的NW—SE向带状展布。该研究成果对于宁夏红寺堡盆地区域稳定性评价及沙漠化的综合治理具有现实指导意义。 相似文献
53.
防碰装置是起重机械重要的安全防护装置,其性能质量直接关系到人员和设备安全。常规的防碰装置性能试验方法难以保证试验数据的精度和可靠性。针对防碰装置的工作特点和试验要求,从试验原理、系统结构、运行逻辑等方面入手,设计一套能模拟防碰装置实际运行工况,自动进行性能试验和数据采集处理,精度高、重复性好的试验系统,可以有效提升防碰装置检测能力。 相似文献
54.
为了提高夹心式压电驱动移动系统的机械输出性能,提出了一种U型预压力调节机构,并开展了预压力对夹心式压电驱动履带移动系统输出性能影响关系的实验研究。首先,针对U型预压力调节机构的安装对夹心式压电振子的振动特性影响关系开展了有限元仿真分析,发现U型预压力调节机构始终处在夹心式压电振子的两相工作模态振动节点位置;其次,开展了夹心式压电驱动履带移动系统的原理样机的预压力调节测试实验,确定了系统的最大输出牵引力及其所对应的最佳预压力;最后,在最佳预压力工作状态下,开展了原理样机的牵引力特性、越障性能以及模拟月壤环境下的运动特性实验。研究结果表明,在最佳预压力工作状态下,夹心式压电驱动履带移动系统的机械输出性能最佳,为其进一步在月面巡视器上的应用提供了技术支持和试验基础。 相似文献
55.
56.
This paper performs a comprehensive analysis and calibration on the geometric error of the ultra-precision drum roll lathe with dual-spindle symmetrical structure and cross slider layout. Firstly, the volumetric error model which contains all geometric errors of the dual-spindle ultra-precision drum roll lathe (DSUPDRL) is developed based on the combination of the homogenous transfer matrix (HTM) and multi-body system (MBS) theory. Secondly, sensitivity analysis for the volumetric error model is conducted to identify the sensitive geometric error components of the DSUPDRL using an improved Sobol method based on the quasi-Monte Carlo algorithm. The result of sensitivity analysis laid the foundation for the subsequent geometric error calibration. Then, some sensitive error components along the X and Z directions are calibrated using a laser interferometer and a pair of inductance displacement probes. Besides the volumetric error model, the concentricity error caused by dual-spindle symmetrical structure is proposed and calibrated by the on-machine measurement using a classic reversal method. Finally, a large-scale roller mold with a diameter of 250 mm and a length of 600 mm is machined using the DSUPDRL after calibration. The experimental result shows that 1.4 μm/600 mm generatrix accuracy is obtained, which validate the effectiveness of the geometric error analysis and calibration. 相似文献
57.
58.
We define the emerging research field of applied data science as the knowledge discovery process in which analytic systems are designed and evaluated to improve the daily practices of domain experts. We investigate adaptive analytic systems as a novel research perspective of the three intertwining aspects within the knowledge discovery process in healthcare: domain and data understanding for physician- and patient-centric healthcare, data preprocessing and modelling using natural language processing and (big) data analytic techniques, and model evaluation and knowledge deployment through information infrastructures. We align these knowledge discovery aspects with the design science research steps of problem investigation, treatment design, and treatment validation, respectively. We note that the adaptive component in healthcare system prototypes may translate to data-driven personalisation aspects including personalised medicine. We explore how applied data science for patient-centric healthcare can thus empower physicians and patients to more effectively and efficiently improve healthcare. We propose meta-algorithmic modelling as a solution-oriented design science research framework in alignment with the knowledge discovery process to address the three key dilemmas in the emerging “post-algorithmic era” of data science: depth versus breadth, selection versus configuration, and accuracy versus transparency. 相似文献
59.
60.
Gerardo Valadez Huerta Johanan Álvarez Jordán Michael Dragon Keno Leites Stephan Kabelac 《International Journal of Hydrogen Energy》2018,43(34):16684-16693
Solid oxide fuel cell (SOFC) systems with anode off-gas recirculation (AGR) and diesel pre-reforming are advantageous because they can operate with the current fuel infrastructure. In the SchIBZ-project, the prototype of such a SOFC system for maritime applications has already been commissioned. In this first paper, we model the system devices to conduct an exergy analysis of this real SOFC plant and validate them with experimental values from experiments in laboratory scale. The results of our simulation agree well with the experimental values. The calculations with the validated results may be closer to the real thermodynamic behavior of such system components than previous literature. 相似文献