全文获取类型
收费全文 | 2337篇 |
免费 | 129篇 |
国内免费 | 3篇 |
专业分类
电工技术 | 34篇 |
综合类 | 5篇 |
化学工业 | 658篇 |
金属工艺 | 63篇 |
机械仪表 | 39篇 |
建筑科学 | 198篇 |
矿业工程 | 4篇 |
能源动力 | 89篇 |
轻工业 | 196篇 |
水利工程 | 16篇 |
石油天然气 | 7篇 |
无线电 | 165篇 |
一般工业技术 | 453篇 |
冶金工业 | 110篇 |
原子能技术 | 12篇 |
自动化技术 | 420篇 |
出版年
2023年 | 28篇 |
2022年 | 54篇 |
2021年 | 79篇 |
2020年 | 50篇 |
2019年 | 71篇 |
2018年 | 54篇 |
2017年 | 58篇 |
2016年 | 86篇 |
2015年 | 88篇 |
2014年 | 107篇 |
2013年 | 164篇 |
2012年 | 140篇 |
2011年 | 200篇 |
2010年 | 104篇 |
2009年 | 133篇 |
2008年 | 147篇 |
2007年 | 135篇 |
2006年 | 107篇 |
2005年 | 87篇 |
2004年 | 84篇 |
2003年 | 54篇 |
2002年 | 63篇 |
2001年 | 33篇 |
2000年 | 36篇 |
1999年 | 30篇 |
1998年 | 26篇 |
1997年 | 28篇 |
1996年 | 28篇 |
1995年 | 22篇 |
1994年 | 17篇 |
1993年 | 16篇 |
1992年 | 16篇 |
1991年 | 10篇 |
1990年 | 9篇 |
1989年 | 17篇 |
1988年 | 8篇 |
1987年 | 5篇 |
1986年 | 9篇 |
1985年 | 8篇 |
1984年 | 8篇 |
1983年 | 5篇 |
1982年 | 5篇 |
1981年 | 3篇 |
1979年 | 3篇 |
1977年 | 2篇 |
1976年 | 4篇 |
1975年 | 4篇 |
1970年 | 4篇 |
1968年 | 2篇 |
1956年 | 2篇 |
排序方式: 共有2469条查询结果,搜索用时 15 毫秒
141.
142.
The solubility and diffusion of carbon dioxide into cooked meat products (cooked ham and meat sausage with different pH-levels) was determined at different starting pressures and gas to product volume ratios by monitoring pressure changes over time in a closed chamber at constant temperatures (0, 4, and 8 °C). Good correlation of the CO2 solubility between the packaging parameters (gas to product volume ratio and initial partial pressure) and the meat products water content was found. The solubility of CO2 followed Henry’s law and the initial partial pressure of CO2 influenced the solubility mostly. Only small variations in the diffusion constants and absorption rates were found within the experimental design. A pH difference of 0.5 in the two meat sausage types did not influence either solubility or diffusion significantly. 相似文献
143.
Jens Clausen Allan Larsen Jesper Larsen Natalia J. Rezanova 《Computers & Operations Research》2010,37(5):809-821
This paper provides a thorough review of the current state-of-the-art within airline disruption management of resources, including aircraft, crew, passenger and integrated recovery. An overview of model formulations of the aircraft and crew scheduling problems is presented in order to emphasize similarities between solution approaches applied to the planning and recovery problems. A brief overview of research within schedule robustness in airline scheduling is included in the review, since this proactive measure is a natural complement to disruption management. 相似文献
144.
Sally Prüschenk Michael Majer Rainer Schreiber Jens Schlossmann 《International journal of molecular sciences》2021,22(24)
The inositol 1,4,5-triphosphate receptor-associated 2 (IRAG2) is also known as Jaw1 or lymphoid-restricted membrane protein (LRMP) and shares homology with the inositol 1,4,5-triphosphate receptor-associated cGMP kinase substrate 1 (IRAG1). IRAG1 interacts with inositol trisphosphate receptors (IP3 receptors /IP3R) via its coiled-coil domain and modulates Ca2+ release from intracellular stores. Due to the homology of IRAG1 and IRAG2, especially in its coiled-coil domain, it is possible that IRAG2 has similar interaction partners like IRAG1 and that IRAG2 also modulates intracellular Ca2+ signaling. In our study, we localized IRAG2 in pancreatic acinar cells of the exocrine pancreas, and we investigated the interaction of IRAG2 with IP3 receptors and its impact on intracellular Ca2+ signaling and exocrine pancreatic function, like amylase secretion. We detected the interaction of IRAG2 with different subtypes of IP3R and altered Ca2+ release in pancreatic acinar cells from mice lacking IRAG2. IRAG2 deficiency decreased basal levels of intracellular Ca2+, suggesting that IRAG2 leads to activation of IP3R under unstimulated basal conditions. Moreover, we observed that loss of IRAG2 impacts the secretion of amylase. Our data, therefore, suggest that IRAG2 modulates intracellular Ca2+ signaling, which regulates exocrine pancreatic function. 相似文献
145.
Forschung im Ingenieurwesen - Der Aufsatz beschreibt eine Möglichkeit, beliebig vermaschte Wärmenetze numerisch zu simulieren. Basierend auf einer graphentheoretischen Beschreibung der... 相似文献
146.
Karin Bucher Jens Mende Michael Mehring Martin Jansen 《Fullerenes, Nanotubes and Carbon Nanostructures》2007,15(1):29-42
A new Eu-endohedral fullerene cage, namely, Eu@C72, was synthesized, separated, and a single isomer, Eu@C72-I, has been isolated by multi-step HPLC for the first time and characterized by LDI-TOF mass spectrometry, UV-Vis and EPR spectroscopy. Additionally, a second isomer, Eu@C72-II, has been separated by HPLC and identified by LDI-TOF mass spectrometry. 相似文献
147.
Jens Bender Dennis Kügler Marian Margraf Ingo Naumann 《Datenschutz und Datensicherheit - DuD》2010,34(5):295-298
Dieser Artikel beschreibt im Detail die datenschutzfreundliche Ausgestaltung des Sperrmanagements, wie es im neuen deutschen Personalausweis zum Einsatz kommt. 相似文献
148.
In this contribution, we review recent efforts on investigations of the effect of (apparent) boundary slip by utilizing lattice Boltzmann simulations. We demonstrate the applicability of the method to treat fundamental questions in microfluidics by investigating fluid flow in hydrophobic and rough microchannels as well as over surfaces covered by nano- or microscale gas bubbles. 相似文献
149.
Louis-Claude Canon Author Vitae Olivier Dubuisson Author Vitae Jens Gustedt Author Vitae Author Vitae 《Journal of Systems and Software》2010,83(5):786-802
The experimental validation and the testing of solutions that are designed for heterogeneous environments are challenging. We introduce Wrekavoc as an accurate tool for this purpose: it runs unmodified applications on emulated multi-site heterogeneous platforms. Its principal technique consists in downgrading the performance of the platform characteristics in a prescribed way. The platform characteristics include the compute nodes themselves (CPU and memory) and the interconnection network for which a controlled overlay network above the homogeneous cluster is built. In this article we describe the tool, its performance, its accuracy and its scalability. Results show that Wrekavoc is a very versatile tool that is useful to perform high-quality experiments (in terms of reproducibility, realism, control, etc.). 相似文献
150.
Hugo Ahlm Grønlund Charlotta Löfström Jens Bue Helleskov Jeffrey Hoorfar 《Food Analytical Methods》2010,3(2):116-119
Validation of PCR thermocycler performance is crucial to obtain reliable results. In this study, infrared (IR) thermography was evaluated as a novel validation tool. After stabilisation, no significant difference in the temperatures recorded using thermography and a reference block-based system was found. By employing IR thermography, information about the length of the time until temperature stabilisation in the sample could be obtained. This study shows the potential of using IR thermography for validation of thermocyclers. 相似文献