全文获取类型
收费全文 | 296篇 |
免费 | 7篇 |
专业分类
电工技术 | 2篇 |
综合类 | 1篇 |
化学工业 | 62篇 |
金属工艺 | 4篇 |
机械仪表 | 9篇 |
建筑科学 | 10篇 |
能源动力 | 8篇 |
轻工业 | 39篇 |
水利工程 | 2篇 |
石油天然气 | 1篇 |
无线电 | 9篇 |
一般工业技术 | 44篇 |
冶金工业 | 15篇 |
原子能技术 | 3篇 |
自动化技术 | 94篇 |
出版年
2023年 | 3篇 |
2022年 | 5篇 |
2021年 | 26篇 |
2020年 | 5篇 |
2019年 | 13篇 |
2018年 | 18篇 |
2017年 | 14篇 |
2016年 | 11篇 |
2015年 | 8篇 |
2014年 | 16篇 |
2013年 | 37篇 |
2012年 | 21篇 |
2011年 | 25篇 |
2010年 | 19篇 |
2009年 | 10篇 |
2008年 | 11篇 |
2007年 | 7篇 |
2006年 | 8篇 |
2005年 | 6篇 |
2004年 | 2篇 |
2003年 | 2篇 |
2002年 | 6篇 |
2001年 | 3篇 |
2000年 | 4篇 |
1999年 | 3篇 |
1998年 | 8篇 |
1997年 | 3篇 |
1996年 | 3篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1968年 | 2篇 |
排序方式: 共有303条查询结果,搜索用时 15 毫秒
1.
J. Jurkovic M. Korosec J. Kopac 《International Journal of Machine Tools and Manufacture》2005,45(9):1023-1030
This paper suggests a reliable direct measuring procedure for measuring different tool wear parameters. Modern image processing techniques and machine vision systems today enable direct tool wear measurement to be accomplished in-cycle. The presented system is characterized by its measurement flexibility, high spatial resolution and good accuracy. The system consists of a light source to illuminate the tool, CCD camera, laser diod (used in conjunction with profile deepness assessment) with linear projector, grabber for capturing the picture, and a PC. The technique is specially characterized by its determination of profile deepness with the help of projected laser raster lines on a tool surface. So it has advantage comparing with other techniques, which can measure only 2D profiles. With the technique presented in this paper a 3D image of relief surface can be obtained without having need to employ a very complicated measuring system. All indirect methods like acoustic emission, force measurement, spindle current measurement, vibration sensors, etc. are very time consuming and demand very expensive subsidiary measurement equipment, compared with the method presented here. 相似文献
2.
Nada Abdulkareem Philipp Skroblin Marjan Jahangiri Manuel Mayr 《Proteomics. Clinical applications》2013,7(7-8):504-515
Aortic aneurysm is a deceptively indolent disease that can cause severe complications such as aortic rupture and dissection. In the normal aorta, vascular smooth muscle cells within the medial layer produce and sustain the extracellular matrix (ECM) that provides structural support but also retains soluble growth factors and regulates their distribution. Although the ECM is an obvious target to identify molecular processes leading to structural failure within the vessel wall, an in-depth proteomics analysis of this important sub-proteome has not been performed. Most proteomics analyses of the vasculature to date used homogenized tissue devoid of spatial information. In such homogenates, quantitative proteomics comparisons are hampered by the heterogeneity of clinical samples (i.e. cellular composition) and the dynamic range limitations stemming from highly abundant cellular proteins. An unbiased proteomics discovery approach targeting the ECM instead of the cellular proteome may decipher the complex, multivalent signals that are presented to cells during aortic remodelling. A better understanding of the ECM in healthy and diseased vessels will provide important pathogenic insights and has potential to reveal novel biomarkers. 相似文献
3.
The paper presents an improved e-learner model that supports monitoring of user behavior related to information security. The model is built upon standardized IMS specification, according to literature research and survey conducted among e-learners. It is positioned as key part of an extended LTSA architecture in which the learner data is used to improve learner security position by continuous delivery of important information and adapting security mechanisms. The implementation is considered in Moodle LMS. 相似文献
4.
This Extended Technical Note shows that the final accuracy level of reverse engineered surfaces depends on scanning distance and scanning angle of the laser beam, hence it also depends on the morphology of the scanned objects. On scanning strongly curved objects, such as the ones with free form surfaces, the distance and impact angle of the laser beam are changing continuously during the scanning process. On the basis of these, two critical parameters are specified for the design model, which make it possible to predict these two factors in advance, depending on the morphology of the scanned object. First, a mathematical-statistical design model of the scanning process is generated, which relies on ANOVA (analysis of variance) and DOE (design of experiments). In the next step, a fitness function is optimized by the genetic algorithm (GA) program. This optimization improves the accuracy of the final scanned surfaces, in terms of the minimum standard deviation values of reverse engineered 3D surface model. The proposed approach was confirmed in a case study, which is presented at the end of this Technical Note. 相似文献
5.
Chen Li Marjan van den Akker Sjaak Brinkkemper Guido Diepen 《Requirements Engineering》2010,15(4):375-396
It is essential for product software companies to decide which requirements should be included in the next release and to
make an appropriate time plan of the development project. Compared to the extensive research done on requirement selection,
very little research has been performed on time scheduling. In this paper, we introduce two integer linear programming models
that integrate time scheduling into software release planning. Given the resource and precedence constraints, our first model
provides a schedule for developing the requirements such that the project duration is minimized. Our second model combines
requirement selection and scheduling, so that it not only maximizes revenues but also simultaneously calculates an on-time-delivery
project schedule. Since requirement dependencies are essential for scheduling the development process, we present a more detailed
analysis of these dependencies. Furthermore, we present two mechanisms that facilitate dynamic adaptation for over-estimation
or under-estimation of revenues or processing time, one of which includes the Scrum methodology. Finally, several simulations
based on real-life data are performed. The results of these simulations indicate that requirement dependency can significantly
influence the requirement selection and the corresponding project plan. Moreover, the model for combined requirement selection
and scheduling outperforms the sequential selection and scheduling approach in terms of efficiency and on-time delivery. 相似文献
6.
A modified design approach for compact ultra‐wideband microstrip filters with cascaded/folded stepped‐impedance resonators is described. The key feature of the proposed method is to facilitate stronger coupling between stepped‐impedance resonators and, at the same time, eliminate the requirement of extremely small gaps in coupled‐line sections, as found in traditional designs. Simulations and measurements demonstrate that the filters designed with this technique exhibit good reflection, insertion‐loss, and group‐delay performance within the 3.1–10.6 GHz band. © 2009 Wiley Periodicals, Inc. Int J RF and Microwave CAE 2010. 相似文献
7.
8.
9.
In recent years, the computational power of modern processors has been increasing mainly because of the increase in the number of processor cores. Computationally intensive applications can gain from this trend only if they employ parallelism, such as thread-level parallelization. Geometric simulations can employ thread-level parallelization because the main part of a geometric simulation can be divided into a subset of mutually independent tasks. This approach is especially interesting for acoustic beam tracing because it is an intensive computing task. This paper presents the parallelization of an existing beam-tracing simulation composed of three algorithms. Two of them are iterative algorithms, and they are parallelized with an already known technique. The most novel method is the parallelization of the third algorithm, the recursive octree generation. To check the performance of the multi-threaded parallelization, several tests are performed using three different computer platforms. On all of the platforms, the multi-threaded octree generation algorithm shows a significant speedup, which is linear when all of the threads are executed on the same processor. 相似文献
10.
Pori Maja Arčon Iztok Dasireddy Venkata D. B. C. Likozar Blaž Orel Zorica Crnjak Marinšek Marjan 《Catalysis Letters》2021,151(11):3114-3134
Catalysis Letters - Industrial Cu/ZnO/Al2O3 or novel rate catalysts, prepared with a photochemical deposition method, were studied under functional CH3OH synthesis conditions at the set temperature... 相似文献