全文获取类型
收费全文 | 1648篇 |
免费 | 53篇 |
国内免费 | 54篇 |
专业分类
电工技术 | 150篇 |
综合类 | 107篇 |
化学工业 | 59篇 |
金属工艺 | 97篇 |
机械仪表 | 220篇 |
建筑科学 | 66篇 |
矿业工程 | 48篇 |
能源动力 | 17篇 |
轻工业 | 30篇 |
水利工程 | 22篇 |
石油天然气 | 14篇 |
武器工业 | 5篇 |
无线电 | 96篇 |
一般工业技术 | 77篇 |
冶金工业 | 94篇 |
原子能技术 | 3篇 |
自动化技术 | 650篇 |
出版年
2024年 | 2篇 |
2023年 | 10篇 |
2022年 | 12篇 |
2021年 | 28篇 |
2020年 | 34篇 |
2019年 | 19篇 |
2018年 | 19篇 |
2017年 | 20篇 |
2016年 | 30篇 |
2015年 | 50篇 |
2014年 | 90篇 |
2013年 | 77篇 |
2012年 | 98篇 |
2011年 | 125篇 |
2010年 | 95篇 |
2009年 | 77篇 |
2008年 | 99篇 |
2007年 | 112篇 |
2006年 | 120篇 |
2005年 | 97篇 |
2004年 | 76篇 |
2003年 | 97篇 |
2002年 | 69篇 |
2001年 | 58篇 |
2000年 | 41篇 |
1999年 | 37篇 |
1998年 | 30篇 |
1997年 | 20篇 |
1996年 | 21篇 |
1995年 | 15篇 |
1994年 | 13篇 |
1993年 | 15篇 |
1992年 | 7篇 |
1991年 | 4篇 |
1990年 | 5篇 |
1989年 | 3篇 |
1988年 | 2篇 |
1987年 | 5篇 |
1986年 | 1篇 |
1985年 | 5篇 |
1984年 | 3篇 |
1983年 | 4篇 |
1982年 | 3篇 |
1981年 | 3篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有1755条查询结果,搜索用时 15 毫秒
1.
重点介绍了本公司热模锻压力机的最新研究成果,以及热模锻压力机在精锻领域自动化批量生产中的应用优势,并论述了生产应用中的选型策略。 相似文献
2.
计算机技术、控制技术及信息技术的发展,电力系统自动化面临着空前的变革,多媒体技术、智能控制技术将迅速进入电力系统自动化领域。 相似文献
3.
ABSTRACTThe purpose of this paper is to analyse the role of the driver within automated driving systems using the Event Analysis of Systemic Teamwork (EAST) method. We already know that as the level of automation increases within the driving task, the role of the driver shifts from that of an active operator (i.e. a driver driving) to more of a passive monitor (i.e. a driver monitoring). Task, social and information networks were constructed using the Hierarchical Task Analysis of Driving and evidence from driver verbalisations collected during a previous study to further explore the changing role of the driver using network analysis. A ‘broken links’ approach was conducted to show that momentary engagement in non-driving-related secondary tasks within an automated driving system can dramatically change the structure of driving system. 相似文献
4.
New technologies offer employers the ability to replace tasks done by human labour with those done by machines. There are challenges for both employers and employees, as employers look for strategies for the implementation of automation technologies and employees may have concerns about their employment being threatened by automation technologies. In this research, we analyse data of over 500 Bulgarians to learn about how they perceive the automation of their jobs. The analysis finds that there are segments of the population defined by demographics and attitudes that are more fearful of the automation of their jobs than others. Additionally, we see that attitudes towards the dehumanizing effects of automation, peer-pressure, job automatability, and a person's self-perception of professionalism are the main drivers of the fear of automation. Finally, the paper evaluates respondents' attitudes towards various individual, corporate and social solutions to automation fears. 相似文献
5.
随着乳化炸药生产工艺日渐成熟,制药设备水平不断升级,国家和行业对炸药生产安全性要求进一步提高,最大限度提高乳化炸药生产的自动化水平,减少在线操作人员数量,对于确保制药企业安全生产具有重要作用。以安徽恒源技研化工有限公司为例,对其乳化炸药生产线网络式主从站自动化控制系统进行了设计和开发。该系统采用中型西门子S7-300 PLC系统,设置1个主站和2个从站,采用以太网进行通信,大大提高了数据的传输带宽和速率,保障了生产过程中数据得以及时处理和系统快速输出反应,提高了炸药生产的安全性;该套系统具备多处上位机可同时操作,确保在单个系统发生故障时,其他备用系统可以正常介入。实践表明,自2016年12月系统建成投产以来,所生产的乳化炸药质量完全达到国家各项指标要求,系统运行稳定可靠,对于实现乳化炸药生产线无(少)人化操作、智能化控制、多元化平台展示、生产设备远程操作有一定的借鉴价值。 相似文献
6.
This paper presents a finite element model to optimise the fibre architecture of components manufactured from discontinuous fibre composites. An optimality criterion method has been developed to maximise global component stiffness, by determining optimum distributions for local section thickness and preform areal mass. The model is demonstrated by optimising the bending performance of a flat plate with three holes. Results are presented from a sensitivity study to highlight the level of compromise in stiffness optimisation caused by manufacturing constraints associated with the fibre deposition method, such as the scale of component features relative to the fibre length. 相似文献
7.
8.
9.
Ultrasonic clamp-on flowmeters (USCF) are popular among measurement technologies due to the versatility of applications, increasing accuracy, and easy, non-intrusive mounting, with the sensors being mounted directly on the external surface of the pipe. In industrial applications, installation space is usually restricted and therefore, flowmeters must be mounted often directly downstream of flow disturbances (FD). A major issue of USCF is the long inlet run needed downstream of FD to achieve a measurement within the specified accuracy. A configuration of two V-paths is proposed, axially rotated 90° relative to each other, that compensates for the flow error introduced due to disturbed flow conditions, independent of the rotational position of the flowmeter. Flow disturbance compensation (FlowDC) is achieved, i.e., accurate measurements within the specification of 2% flow rate accuracy, when the flowmeter is mounted as close as 2 pipe diameters (D) downstream of a FD. Computational fluid dynamics (CFD) are employed to generate rotationally independent correction factors that compensate for the error introduced from disturbed inlet conditions. An automated simulation method is developed to generate correction factors for 90° bend, out-of-plane bend, expansion, and contraction, at mounting distances from 2D to 100D, several flow rates, and rotational positions 0°, 90°, 180°, 270°. This study would be practically impossible with non-automated simulations or solely with measurements. In-house experiments were performed with an industrial clamp-on device at selected distances from the FD with the aim of verifying the simulation results. An independent field-test is presented that showcases the value of FlowDC in USCF applications. The automated simulations have the capability to simulate further FDs on-demand, with the aim of creating a database for the needs of the respective application in industry. 相似文献
10.
Fibre-reinforced-thermoplastics (FRT) have excellent weight-specific properties compared to conventional engineering materials. However, a wider dissemination of this technology into existing plant technologies is restrained by the low degree of automation. Complex FRT component geometries pose special challenges to gripper design and handling strategies in automated preform processes regarding limp material behaviour and fast cooling time. The preform quality is influenced by the component geometry, reinforcing fabric, and preform process. This paper presents the development of an automated handling and draping strategy, which is validated by finite-element-analysis and experimental testing to meet the requirements of large-scale preforming processes for complex geometries. 相似文献