全文获取类型
收费全文 | 1937篇 |
免费 | 72篇 |
国内免费 | 9篇 |
专业分类
电工技术 | 17篇 |
综合类 | 6篇 |
化学工业 | 464篇 |
金属工艺 | 60篇 |
机械仪表 | 25篇 |
建筑科学 | 119篇 |
矿业工程 | 6篇 |
能源动力 | 60篇 |
轻工业 | 233篇 |
水利工程 | 24篇 |
无线电 | 117篇 |
一般工业技术 | 351篇 |
冶金工业 | 251篇 |
原子能技术 | 21篇 |
自动化技术 | 264篇 |
出版年
2023年 | 10篇 |
2021年 | 26篇 |
2020年 | 11篇 |
2019年 | 25篇 |
2018年 | 25篇 |
2017年 | 31篇 |
2016年 | 38篇 |
2015年 | 53篇 |
2014年 | 53篇 |
2013年 | 72篇 |
2012年 | 100篇 |
2011年 | 104篇 |
2010年 | 94篇 |
2009年 | 83篇 |
2008年 | 107篇 |
2007年 | 106篇 |
2006年 | 71篇 |
2005年 | 58篇 |
2004年 | 65篇 |
2003年 | 40篇 |
2002年 | 49篇 |
2001年 | 32篇 |
2000年 | 43篇 |
1999年 | 35篇 |
1998年 | 78篇 |
1997年 | 74篇 |
1996年 | 31篇 |
1995年 | 41篇 |
1994年 | 28篇 |
1993年 | 33篇 |
1992年 | 15篇 |
1991年 | 19篇 |
1990年 | 25篇 |
1989年 | 24篇 |
1988年 | 23篇 |
1987年 | 12篇 |
1986年 | 12篇 |
1985年 | 20篇 |
1984年 | 21篇 |
1983年 | 23篇 |
1982年 | 11篇 |
1981年 | 17篇 |
1980年 | 23篇 |
1979年 | 13篇 |
1978年 | 19篇 |
1977年 | 16篇 |
1976年 | 16篇 |
1975年 | 12篇 |
1973年 | 12篇 |
1971年 | 11篇 |
排序方式: 共有2018条查询结果,搜索用时 31 毫秒
71.
Efficient Engineering and Production Concepts for Products in Regulated Environments – Dream or Nightmare?
下载免费PDF全文
![点击此处可从《化学,工程师,技术》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Prof. Jochen Strube Dr. Reinhard Ditz Holger Fröhlich Dr. Dirk Köster Dr. Thomas Grützner Dr. Jörg Koch Dr. Rüdiger Schütte 《化学,工程师,技术》2014,86(5):687-694
Manufacturing of chemical‐pharmaceutical products is moving increasingly fast on a global scale. Therefore, developing and starting up production facilities fast, with high quality, and at reasonable costs has become extremely challenging. Engineering concepts like modularization, standardization and simultaneous/parallel engineering are discussed as methods for speeding up process design and filing for regulatory approval. Transfer from batch to continuous operation mode of production is pointed out as the key‐issue in such strategies. 相似文献
72.
Holger Becker Reinhard Caspary Christian Toepfer Manfred V. Schickfus Siegfried Hunklinger 《Journal of Modern Optics》2013,60(9):1715-1723
Abstract We have developed a fixed beam direct writing laser lithography system with a minimum feature size of 400nm at 457nm wavelength and a writing speed of 4·2mm/s with total system costs of less than 100 000 US$. 相似文献
73.
Miklas Scholz Jing Xu Hilary I Dodson 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2001,76(8):827-835
The aim of this study was to investigate the treatment efficiency of passive vertical‐flow wetland filters containing Phragmites australis and/or Typha latifolia and granular media of different adsorption capacities. A cost–benefit analysis was performed on the characteristics of constructed wetlands. Cheap gravel and sand as well as expensive granular activated carbon, charcoal and Filtralite (light expanded clay) were used as filter media. Different concentrations of lead and copper sulfate were added to polluted urban beck inflow water in order to simulate pre‐treated mine wastewater, landfill leachate or highway runoff. The relationships between growth media, microbial and plant communities as well as the reduction of lead, copper, five‐day biochemical oxygen demand (BOD) in particular, and potentially pathogenic bacteria were investigated. A breakthrough of copper within the first 9 weeks was only recorded for filters containing media with limited adsorption capacities. The breakthrough was independent of the presence of plants. However, after maturation of the biomass, which dominated the schmutzdecke and litter zone, lead and copper concentrations were reduced by 97–99% and BOD by 41–60% in all wetlands. There appears to be no additional benefit in using macrophytes and expensive adsorption media in constructed wetlands to enhance metal reduction during the set‐up period of 5 months. © 2001 Society of Chemical Industry 相似文献
74.
Bernd Oberdorfer Eva-Maria Steyskal Wolfgang Sprengel Reinhard Pippan Michael Zehetbauer Werner Puff Roland Würschum 《Journal of Alloys and Compounds》2011
The release of excess volume upon recrystallization of ultrafine-grained Ni deformed by high-pressure torsion was measured with a high-precision difference-dilatometer employing constant heating rates in the range from 0.3 to 10 K min?1. The kinetics of the recrystallization process was analyzed according to the Johnson–Mehl–Avrami–Kolmogorov theory adapted to the case of constant heating rates. An effective Avrami exponent of 2 and a value of 1.20 eV for the activation energy of recrystallization was determined. Analysis by the Kissinger method yielded the same result for the activation energy. 相似文献
75.
76.
Jegatheswaran Ratnasingam Rainer Grohmann Frieder Scholz 《Holz als Roh- und Werkstoff》2010,5(2):115-116
In this study, the kiln drying yield of 30 mm Rubberwood (Hevea brasiliensis)
used for the furniture manufacturing industry in South East Asia was evaluated. The results showed that
the average yield loss was 10%, and end-checks, splits and warping were the most common drying defects.
It was found that sawn timber from older trees (> 21 years) were less prone to drying defects,
and the use of stress relieving treatments significantly reduced the incidence of drying defects. 相似文献
77.
78.
Thomas Beer Tobias Meisen Rudolf Reinhard Sergey Konovalov Daniel Schilberg Sabina Jeschke Torsten Kuhlen Christian Bischof 《Production Engineering》2011,5(4):383-391
Computational simulations are used for the optimization of production processes in order to significantly reduce the need
for costly experimental optimization approaches. Yet individual simulations can rarely describe more than a single production
step. A set of simulations has to be coupled to each other to form a contiguous representation of a process chain. Eventually,
simulated results have to be analyzed by domain experts to gather insight from the preformed computations. In this paper,
we propose an IT infrastructure and software tools that aim at a rather non-intrusive way of coupling resources and domain
expert’s knowledge to enable the collaborative setup, execution and analysis of distributed simulation chains. We illustrate
the approach in the domain of materials processing. Beyond means originating from the domain of GRID computing for resource
management, a data integration component assures semantic data integrity between the simulation steps and stores simulation
data in an application independent way. Thus, we can transform this data into native formats for each simulation tool, and
finally into a format that allows for contiguous visualizations and an intuitive, comprehensive analysis of complete simulated
process chains. 相似文献
79.
The study evaluated the concentration and particle size distribution of air-borne wood dust in the Rubberwood furniture manufacturing
industry. Air quality samples were measured at routing and hand-sanding work stations in furniture factories using the micro-orifice
uniform deposit impactor (MOUDI) air-quality measuring instrument. It was found that less than 25% of the air-borne wood dust
particles at the two work stations were less than 10 μm in size, which in turn did not pose major respiratory health hazards.
However, the high wood dust concentrations at the two work stations is a matter of concern, and efforts must be taken to minimize
the air-borne wood dust exposure levels workers are subjected to in the Rubberwood furniture manufacturing industry. 相似文献
80.
G. Scholz E. Nothnick G. Avramidis A. Krause H. Militz W. Viöl A. Wolkenhauer 《Holz als Roh- und Werkstoff》2010,68(3):315-321
Beech wood was impregnated with two hot melting waxes. Contact angle measurement followed to determine hydrophobizing of such treated wood. Tensile shear tests were carried out to test the adhesion properties with three different glues under varying environmental conditions. Furthermore, wax impregnated beech was subjected to plasma treatment prior to glueing. The results demonstrate that wood treated with polar paraffin shows lower adhesion properties compared to montan wax. Therefore, montan wax was investigated more intensely. Beech impregnated with such wax can be used for constructive building elements in the interior sector. D3 Glues for non-constructive applications were realized by using PVAc and phenol-resorcinol resin under permanent influence of humidity. Plasma treatment improves this quality to obtain D4 glue. Back-drying of the water stored specimens proves the suitability of isocyanate glue and also that of PVAc after plasma treatment for 120 s. 相似文献