全文获取类型
收费全文 | 1263篇 |
免费 | 73篇 |
国内免费 | 5篇 |
专业分类
电工技术 | 10篇 |
化学工业 | 443篇 |
金属工艺 | 52篇 |
机械仪表 | 56篇 |
建筑科学 | 45篇 |
矿业工程 | 13篇 |
能源动力 | 44篇 |
轻工业 | 96篇 |
水利工程 | 2篇 |
石油天然气 | 9篇 |
无线电 | 83篇 |
一般工业技术 | 227篇 |
冶金工业 | 58篇 |
原子能技术 | 2篇 |
自动化技术 | 201篇 |
出版年
2024年 | 1篇 |
2023年 | 17篇 |
2022年 | 108篇 |
2021年 | 133篇 |
2020年 | 39篇 |
2019年 | 45篇 |
2018年 | 65篇 |
2017年 | 46篇 |
2016年 | 77篇 |
2015年 | 62篇 |
2014年 | 67篇 |
2013年 | 101篇 |
2012年 | 70篇 |
2011年 | 86篇 |
2010年 | 50篇 |
2009年 | 48篇 |
2008年 | 55篇 |
2007年 | 36篇 |
2006年 | 27篇 |
2005年 | 31篇 |
2004年 | 27篇 |
2003年 | 20篇 |
2002年 | 10篇 |
2001年 | 9篇 |
2000年 | 7篇 |
1999年 | 9篇 |
1998年 | 11篇 |
1997年 | 12篇 |
1996年 | 10篇 |
1995年 | 9篇 |
1994年 | 3篇 |
1993年 | 4篇 |
1991年 | 3篇 |
1990年 | 6篇 |
1989年 | 7篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1985年 | 4篇 |
1984年 | 5篇 |
1983年 | 2篇 |
1981年 | 1篇 |
1980年 | 4篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有1341条查询结果,搜索用时 0 毫秒
31.
Generation of Inducible BCL11B Knockout in TAL1/LMO1 Transgenic Mouse T Cell Leukemia/Lymphoma Model
Grzegorz K. Przybylski Dorota Korsak Katarzyna Iykowska Karina Nowicka Tomasz Zalewski Magorzata Tubacka Maria Mosor Danuta Januszkiewicz-Lewandowska Magdalena Frydrychowicz Maciej Boruczkowski Grzegorz Dworacki Jens van den Brandt Piotr Grabarczyk Christian A. Schmidt Chengwu Zeng Yangqiu Li 《International journal of molecular sciences》2022,23(9)
32.
We present an overview of some recent developments in the area of mathematical modeling of maintenance decisions for multi-unit systems. The emphasis is on three main groups of multicomponent maintenance optimization models: the block replacement models, group maintenance models, and opportunistic maintenance models. Moreover, an example of a two-unit system maintenance process is provided in order to compare various maintenance policies. 相似文献
33.
Dawei Wang Wei Ding Henry Lo Tomasz Stepinski Josue Salazar Melissa Morabito 《Applied Intelligence》2013,39(4):772-781
The technique of Hotspot Mapping is widely used in analysing the spatial characteristics of crimes. The spatial distribution of crime is considered to be related with a variety of socio-economic and crime opportunity factors. But existing methods usually focus on the target crime density as input without utilizing these related factors. In this study, we introduce a new crime hotspot mapping tool—Hotspot Optimization Tool (HOT). HOT is an application of spatial data miming to the field of hotspot mapping. The key component of HOT is the Geospatial Discriminative Patterns (GDPatterns) concept, which can capture the differences between two classes in a spatial dataset. Experiments are done using a real world dataset from a northeastern city in the United States and the pros and cons of utilizing related factors in hotspot mapping are discussed. Comparison studies with the Hot Spot Analysis tool implemented by Esri ArcMap 10.1 validate that HOT is capable of accurately mapping crime hotspots. 相似文献
34.
35.
Tomasz Patyk Perttu Salmela Teemu Pitkänen Pekka Jääskeläinen Jarmo Takala 《Journal of Signal Processing Systems》2011,65(2):245-259
Field programmable gate array (FPGA) is a flexible solution for offloading part of the computations from a processor. In particular, it can be used to accelerate an execution of a computationally heavy part of the software application, e.g., in DSP, where small kernels are repeated often. Since an application code for a processor is a software, a design methodology is needed to convert the code into a hardware implementation, applicable to the FPGA. In this paper, we propose a design method, which uses the Transport Triggered Architecture (TTA) processor template and the TTA-based Co-design Environment toolset to automate the design process. With software as a starting point, we generate a RTL implementation of an application-specific TTA processor together with the hardware/software interfaces required to offload computations from the system main processor. To exemplify how the integration of the customized TTA with a new platform could look like, we describe a process of developing required interfaces from a scratch. Finally, we present how to take advantage of the scalability of the TTA processor to target platform and application-specific requirements. 相似文献
36.
37.
An investigation of the through-thickness properties of carbon fibre prepreg laminates, Non-Crimp Fabric laminates and non-crimp 3D orthogonal woven composites by pull-through testing was performed. Influence of matrix system and curing temperature on the performance of the 3D woven composites was investigated. 相似文献
38.
Junying Liu Rui Zhang Itaru Osaka Sarada Mishra Anna E. Javier Detlef‐M. Smilgies Tomasz Kowalewski Richard D. McCullough 《Advanced functional materials》2009,19(21):3427-3434
New solution processable 4‐(2‐hexyldecan)‐4H‐bisthieno[2,3‐d:3′,2′‐b]pyrrole and 4,4′‐dialkyl‐2,2′‐bithiazole‐based copolymers (PBTzDTPs) are synthesized with excellent FET performance. These novel copolymers have considerable potential in printable electronics as they have high charge carrier mobilities, excellent air stability, good solution processibility, and no requirement for post‐deposition thermal annealing, all requirements for this field of application. The thin film transistors fabricated from PBTzDTPs achieve field effect mobilities as high as 0.14 cm2 V?1 s?1 with current on/off ratios up to 106 without thermal annealing. In addition, the devices exhibit stable performance in air, showing no significant degradation over 60 days. Moreover, the polymers described here provide an excellent example of the systems in which higher mobility performance does not require higher crystalline, long‐range ordered structures. Such a system appears to be particularly promising for rapid fabrication techniques, where kinetic conditions usually prevent the development of long‐range order. 相似文献
39.
Jan Bilski Monika Pinkas Dagmara Wojcik-Grzybek Marcin Magierowski Edyta Korbut Agnieszka Mazur-Bialy Gracjana Krzysiek-Maczka Slawomir Kwiecien Katarzyna Magierowska Tomasz Brzozowski 《International journal of molecular sciences》2022,23(7)
Both obesity and esophageal adenocarcinoma (EAC) rates have increased sharply in the United States and Western Europe in recent years. EAC is a classic example of obesity-related cancer where the risk of EAC increases with increasing body mass index. Pathologically altered visceral fat in obesity appears to play a key role in this process. Visceral obesity may promote EAC by directly affecting gastroesophageal reflux disease and Barrett’s esophagus (BE), as well as a less reflux-dependent effect, including the release of pro-inflammatory adipokines and insulin resistance. Deregulation of adipokine production, such as the shift to an increased amount of leptin relative to “protective” adiponectin, has been implicated in the pathogenesis of BE and EAC. This review discusses not only the epidemiology and pathophysiology of obesity in BE and EAC, but also molecular alterations at the level of mRNA and proteins associated with these esophageal pathologies and the potential role of adipokines and myokines in these disorders. Particular attention is given to discussing the possible crosstalk of adipokines and myokines during exercise. It is concluded that lifestyle interventions to increase regular physical activity could be helpful as a promising strategy for preventing the development of BE and EAC. 相似文献
40.
Branislaw Jariczuk Wieslaw Wojcik Tomasz Bialopiotrowicz 《Petroleum Science and Technology》1989,7(7):969-987
Contact angle measurements were carried out in coal / n-alkanes film - air bubble - water systems. Then theoretical an analysis of the equilibrium state of that system was carried out on the basis of the components of the surface free energy of coal of various ranks. The contact angles were measured for four ranks of Polish coal which surfaces were covered with n-alkanes film in the homological series from n-hexane to n-hexadecane. On the basis of the studies and calculations carried out we have concluded that the values of the contact angle depend on the rank of coal, a thickness of n-alkane film and its structure and the presence of water film under the air bubble. It was also found that the changes of the- values of the contact angles measured in the mentioned sytems as a function of the number of contacted air bubbles were similar to those calculated on the basis of the solution of Young equation in function of the surface free energy of coals precovered with n-alkane film. 相似文献