全文获取类型
收费全文 | 630篇 |
免费 | 27篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 7篇 |
综合类 | 1篇 |
化学工业 | 159篇 |
金属工艺 | 7篇 |
机械仪表 | 18篇 |
建筑科学 | 20篇 |
矿业工程 | 6篇 |
能源动力 | 12篇 |
轻工业 | 79篇 |
水利工程 | 3篇 |
石油天然气 | 3篇 |
武器工业 | 2篇 |
无线电 | 35篇 |
一般工业技术 | 105篇 |
冶金工业 | 104篇 |
原子能技术 | 12篇 |
自动化技术 | 85篇 |
出版年
2023年 | 3篇 |
2022年 | 8篇 |
2021年 | 24篇 |
2020年 | 9篇 |
2019年 | 11篇 |
2018年 | 14篇 |
2017年 | 12篇 |
2016年 | 21篇 |
2015年 | 17篇 |
2014年 | 17篇 |
2013年 | 44篇 |
2012年 | 21篇 |
2011年 | 35篇 |
2010年 | 23篇 |
2009年 | 23篇 |
2008年 | 28篇 |
2007年 | 23篇 |
2006年 | 21篇 |
2005年 | 21篇 |
2004年 | 16篇 |
2003年 | 13篇 |
2002年 | 13篇 |
2001年 | 12篇 |
2000年 | 11篇 |
1999年 | 17篇 |
1998年 | 28篇 |
1997年 | 18篇 |
1996年 | 19篇 |
1995年 | 14篇 |
1994年 | 7篇 |
1993年 | 13篇 |
1992年 | 10篇 |
1991年 | 9篇 |
1990年 | 7篇 |
1989年 | 11篇 |
1988年 | 8篇 |
1984年 | 3篇 |
1983年 | 3篇 |
1982年 | 7篇 |
1981年 | 3篇 |
1980年 | 5篇 |
1979年 | 2篇 |
1976年 | 7篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1971年 | 3篇 |
1969年 | 2篇 |
1940年 | 2篇 |
1912年 | 3篇 |
排序方式: 共有658条查询结果,搜索用时 15 毫秒
11.
Waldemar Kröner und Wilhelm Völksen 《Zeitschrift für Lebensmitteluntersuchung und -Forschung A》1943,85(2):169-172
Ohne ZusammenfassungDiese Z.83, 193 (1942). 相似文献
12.
Inside Cover: Site‐Specific Immobilization of the Peptidoglycan Synthase PBP1B on a Surface Plasmon Resonance Chip Surface (ChemBioChem 23/2016) 下载免费PDF全文
13.
Universitärer Forschungscluster „Sustainable Technologies in Metal Production and Processing” (STMP)
H. Antrekowitsch H. Biedermann B. Buchmayr F. Ebner W. Eichlseder H. Harmuth W. Kepplinger F. Kessler W. Krieger K. Lorber A. Ludwig 《BHM Berg- und Hüttenm?nnische Monatshefte》2006,151(7):263-266
Foundation of a university research cluster — Co-operation along the value creation chain from raw materials to components — Evidence of joint performance offers — Utilization of synergies — Integration of Christian Doppler Laboratories — Flexible arrangement of co-operations and networks 相似文献
14.
Modeling of real physical processes by numerical methods is highly time-consuming and requires significant computational capacity. In some cases, tens or even hundreds of hours of high-power computing are needed to virtually model a real process that lasts one second. Processes that take many hours, such as drying, pose an even greater challenge. This problem can be solved in two ways: by using faster computers (such as computing clusters) or by significantly simplifying the modeled process (its geometry, physical phenomena, or the impact of individual factors). For this reason, all methods which speed up or minimize the number of simulations required to achieve the research objective should be analyzed. This article focuses on the latter approach, and it proposes a simple method for predicting the responses of a numerical model (values of any output parameter) to changes in input values (values of any input parameter). This method requires a base model, such as a numerical model which is qualitatively and quantitatively consistent with experimental observations, and a sensitivity analysis. This article discusses the mathematical and logical premises for the discussed model, and it proposes two methods for predicting numerical simulation results. Those methods are illustrated with examples which analyze the behavior of the Eulerian Multiphase Model and describe phase interactions based on Gidaspow's approach. The discussed example relies on data from a series of articles published by the authors in Drying Technology. This article was inspired by the observations made during a time-consuming process of modeling a spouted bed grain dryer, which was described in the above publications. The objective of this study was to discuss the advantages and possibilities created by sensitivity analyses of numerical models and to encourage their practical application. 相似文献
15.
16.
Karin Schwarz Hedda Ernst Waldemar Ternes 《Journal of the science of food and agriculture》1996,70(2):217-223
The non-polar fraction of thyme was examined for the occurrence of phenolic components and their antioxidative activity. In addition to carvacrol ( II ) and thymol ( III ), p -cymene-2,3-diol (I ; 2,3-dihydroxy-4-isopropyl-1-methylbenzene) was isolated for the first time from thyme. The structure of I was elucidated using 1H nuclear magnetic resonance (NMR), 13C NMR, and mass spectrometry. Antioxidative activity was investigated with the Rancimat method (100°C) and the Schaal test (60°C). Compound I exhibited the strongest antioxidative activity which was greater than that of α-tocopherol and butylated hydroxyanisole. Five thyme species were analysed by means of HPLC with electrochemical detection for the concentration of compounds I – III . The highest amounts of I – III were found in Thymus vulgaris L. 相似文献
17.
K. Wenderoth J. Petermann K.-D. Kruse J.-L. ter Haseborg W. Krieger 《Polymer Composites》1989,10(1):52-56
In this paper the electromagnetic inductance (EMI)-shielding of metal-and ferroelectric-particle filled polymers is described. The composite, containing only metallic fillers, has a shielding effectiveness comparable to conventional products. The addition of a few percent of ferroelectric material to this composite enhances the shielding behavior by several orders of magnitude—without increasing its electrical conductivity. In this three component composite the shielding effectiveness reaches a maximum close to the ferroelectric/paraelectric transition temperature. The synergetic effect, obtained by the addition of ferroelectrical particles, is related to the high dielectric losses of ferroelectric material close to its transition temperature. 相似文献
18.
Justyna Zygmuntowicz Paweł Falkowski Marcin Wachowski Konrad Cymerman Paulina Piotrkiewicz Waldemar Kaszuwara 《International Journal of Applied Ceramic Technology》2020,17(4):1731-1741
In the present research, the influence of sintering temperature on the microstructure and properties of Al2O3–Cu–Ni hybrid composites prepared by the Pulse Plasma Sintering (PPS) technique were described. In this research, three temperatures have been selected: 1250°C, 1300°C, and 1350°C. SEM observations were carried out to determine the distribution of the metallic phase in the composite depending on the sintering temperature. The conducted experiments and microscopic observations enabled a better understanding of the phenomena occurring between the ceramic matrix and metallic phase in the obtained materials. The mechanical properties like a hardness and fracture toughness were measured. The technology applied allowed us to obtain ceramic-metal composites with a homogeneous microstructure. It was found that the sintering temperature influences the selected physical and mechanical properties of the composites produced. It was found that samples produced at 1300°C are characterized by the highest relative density and the mechanical properties. 相似文献
19.
Maria Tynek Roman Pawłowicz Justyna Gromadzka Robert Tylingo Waldemar Wardencki Gyorgy Karlovits 《European Journal of Lipid Science and Technology》2012,114(3):357-366
The aim of the present study was to compare different rape varieties. For this purpose oil from six different varieties of rapeseeds was cold pressed under laboratory conditions. In the obtained rapeseed oils the fatty acids composition and minor components, characteristic values (acid value; AV and TOTOX), oxidative stability (DSC test), and volatiles were determined and a sensory evaluation was carried out. The highest oxidative stability was found for oil from sample 5 (IP = 158 min), which also has the lowest amount of C18:3 (7.8%), chlorophylls (0.083 mg/kg), and metals (Cu2+ 0.02 mg/kg and Fe2+ 0.08 mg/kg). This oil has also the lowest AV (0.17 mg KOH/g), which may be related to the lowest moisture content of the seeds prior to extraction. It was characterized by the highest rapeseed flavor intensity. The lowest induction period was observed for samples 3 and 6 (100 min). Although sample 3 had the same low level of metals as sample 5 and the highest concentration of tocopherols (635 mg/kg), PUFA (33.9%), and AV (1.37 mg KOH/g) it also had the lowest intensity of rapeseed flavor among the analyzed oils. Sample 6, despite its low percentage of PUFA (24.7%), conjugated diens and triens, and the lowest content of total volatiles (0.4Vs), had the highest concentration of metals (Cu2+ 0.04 mg/kg and Fe2+ 0.34 mg/kg). 相似文献
20.
N. Endstrasser B. Rasul K. Krieger P. Scheier 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2009,267(4):700-703
Sticking coefficients of deuterium from are quantified on fusion relevant plasma sprayed tungsten and carbon fibre composite in the incident energy range from about 0-100 eV. The samples that were cut from ASDEX-Upgrade tiles are exposed to a beam of of specific incident energy, Einc, in the tandem mass spectrometer BESTOF in Innsbruck. Nuclear reaction analysis is performed ex-situ at IPP Garching for the quantification of deuterium content. The deuterium content difference measured on a spot before and after ion-beam exposure of the sample is assigned to the above mentioned species of hydrocarbon molecules sticking on the surface, allowing the calculation of the sticking probability of a specific deuterated molecular ion. The sticking coefficient, S, is found to depend on the incident energy and shows a maximum of about S ∼ 0.4 around Einc = 30 eV on CFC and about S ∼ 0.1 near Einc = 20 eV in case of PSW. 相似文献