全文获取类型
收费全文 | 107篇 |
免费 | 5篇 |
专业分类
电工技术 | 6篇 |
化学工业 | 5篇 |
金属工艺 | 1篇 |
机械仪表 | 4篇 |
轻工业 | 32篇 |
石油天然气 | 1篇 |
无线电 | 17篇 |
一般工业技术 | 6篇 |
冶金工业 | 16篇 |
自动化技术 | 24篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 2篇 |
2020年 | 2篇 |
2019年 | 3篇 |
2016年 | 2篇 |
2015年 | 3篇 |
2014年 | 3篇 |
2013年 | 3篇 |
2012年 | 5篇 |
2011年 | 9篇 |
2010年 | 4篇 |
2009年 | 3篇 |
2008年 | 2篇 |
2007年 | 6篇 |
2006年 | 1篇 |
2004年 | 3篇 |
2003年 | 5篇 |
2002年 | 2篇 |
2001年 | 2篇 |
2000年 | 2篇 |
1999年 | 3篇 |
1998年 | 8篇 |
1997年 | 1篇 |
1996年 | 3篇 |
1994年 | 1篇 |
1993年 | 4篇 |
1992年 | 3篇 |
1991年 | 3篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 5篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1972年 | 2篇 |
1969年 | 1篇 |
1964年 | 1篇 |
排序方式: 共有112条查询结果,搜索用时 15 毫秒
1.
Ada Gavrilovska Sanjay Kumar Srikanth Sundaragopalan Karsten Schwan 《Multimedia Tools and Applications》2007,34(2):179-200
Increased network speeds coupled with new services delivered via the Internet have increased the demand for intelligence and
flexibility in network systems. This paper argues that both can be provided by new hardware platforms comprised of heterogeneous
multi-core systems with specialized communication support. We present and evaluate an experimental network service platform
that uses an emergent class of devices—network processors—as its communication support, coupled via a dedicated interconnect
to a host processor acting as a computational core. A software infrastructure spanning both enables the dynamic creation of
application-specific services on the network processor, mediated by middleware and controlled by kernel-level communication
support. Experimental evaluations use a Pentium IV-based computational core coupled with an IXP 2400 network processor. The
sample application services run on both include an image manipulation application and application-level multicasting.
相似文献
Karsten SchwanEmail: |
2.
The topological properties of a set of nuclei undergoing a phase transformation were investigated. The nuclei were spread out in a plane according to a Poisson distribution. All centres started to grow at the same moment and with the same constant rate. They grew circularly and free of shrinking. The mean numbers per nucleus of grain boundaries, triple points and growth fronts were calculated as functions of the degree of transformation, F (0F1). For these relationships we deduce plain and exact expressions. 相似文献
3.
H P Schwan 《The Journal of microwave power》1984,19(4):225-231
The following topics are discussed: Standard of safety considerations. Early efforts in bioengineering and biophysics before and after World War II, Work after World War II (1950s), Early interest in hazards, Soviet work and The Tri-Service area and ANSI. The author concludes that the historical development of biophysics and bioengineering, both as a whole and in the specialty area of nonionizing radiation, proceeded in a fairly rational fashion. Formulation of exposure standards in the West was based on the biophysical approach, which prevails in the interdisciplinary sciences involving biomedical and engineering disciplines. No pressure by an "industrial-military establishment" was evident in the quest for standards, and the Soviet approach and work were under surveillance from the late 1950's. A continuous interest in athermal effects has persisted since the 1930's. Historical accounts are based on personal experience and study of the literature. They are therefore limited to the extent that such experience and study is incomplete. The author had the good fortune to participate over a professional lifetime in the development of biophysical and biomedical engineering sciences, including those that address nonionizing radiation and Western standards of safety. 相似文献
4.
MA Dobbs M Lueker KA Aird AN Bender BA Benson LE Bleem JE Carlstrom CL Chang HM Cho J Clarke TM Crawford AT Crites DI Flanigan T de Haan EM George NW Halverson WL Holzapfel JD Hrubes BR Johnson J Joseph R Keisler J Kennedy Z Kermish TM Lanting AT Lee EM Leitch D Luong-Van JJ McMahon J Mehl SS Meyer TE Montroy S Padin T Plagge C Pryke PL Richards JE Ruhl KK Schaffer D Schwan E Shirokoff HG Spieler Z Staniszewski AA Stark K Vanderlinde JD Vieira C Vu B Westbrook R Williamson 《The Review of scientific instruments》2012,83(7):073113
A technological milestone for experiments employing transition edge sensor bolometers operating at sub-Kelvin temperature is the deployment of detector arrays with 100s-1000s of bolometers. One key technology for such arrays is readout multiplexing: the ability to read out many sensors simultaneously on the same set of wires. This paper describes a frequency-domain multiplexed readout system which has been developed for and deployed on the APEX-SZ and South Pole Telescope millimeter wavelength receivers. In this system, the detector array is divided into modules of seven detectors, and each bolometer within the module is biased with a unique ~MHz sinusoidal carrier such that the individual bolometer signals are well separated in frequency space. The currents from all bolometers in a module are summed together and pre-amplified with superconducting quantum interference devices operating at 4 K. Room temperature electronics demodulate the carriers to recover the bolometer signals, which are digitized separately and stored to disk. This readout system contributes little noise relative to the detectors themselves, is remarkably insensitive to unwanted microphonic excitations, and provides a technology pathway to multiplexing larger numbers of sensors. 相似文献
5.
Beena J. Jebamalar A. S. Sindhusha S. Sabari Girisun T. C. Dhanusha A. 《Journal of Materials Science: Materials in Electronics》2021,32(23):27198-27215
Journal of Materials Science: Materials in Electronics - Single crystals of copper (II) complex of P-Toluene sulfonic acid (PTSC) suitable for photonic applications were grown by slow evaporation... 相似文献
6.
Dayana Pereira de Andrade Cíntia Lacerda Ramos Diego Alvarenga Botrel Soraia Vilela Borges Rosane Freitas Schwan Disney Ribeiro Dias 《International Journal of Food Science & Technology》2019,54(7):2355-2362
The probiotic strains Lactobacillus brevis CCMA1284 and Lactobacillus plantarum CCMA0359 were microencapsulated by spray drying using different matrices – whey powder (W), whey powder with inulin (WI) and whey powder with maltodextrin (WM). Viability of the microencapsulated strains in acid and bile juices and during 90 days of storage (seven and 25 °C) was evaluated. The two strains exhibited high encapsulation efficiency (> 86%) by spray drying. The different matrices maintained L. plantarum viability above six log CFU g−1 at 7 °C for 90 days, whereas similar results for L. brevis were observed only for W. The use of inulin as matrix of encapsulation did not enhance bacterial viability in the evaluated conditions. In general, the use of W and WM as matrices was effective for L. plantarum viability. However, only W was effective for L. brevis in the evaluated conditions. The spray drying technique was successfully adopted for the encapsulation of L. plantarum CCMA0359 and L. brevis CCMA1284 strains. 相似文献
7.
The static distribution of work among tasks is not possible in many parallel applications. Therefore, it is essential to implement convenient and efficient abstractions for ‘work sharing’ on multicomputers. This paper compares the utility of two operating system facilities for the implementation of such ‘work sharing’: (1) a system for the migration of processes from heavily to less loaded processors and (2) a more general OS construct for the implementation of arbitrary distributed objects. Both were implemented as extensions to the Intel iPSC/1 operating system on a 32-node hypercube. Their experimental evaluation is based on a parallel implementation of a branch-and-bound algorithm. Two sets of results are attained. First, the necessity of the constructs for dynamic work sharing is demonstrated for applications with dynamic data domains, such as parallel branch-and-bound algorithms. This is followed by measurements that demonstrate the acceptable cost of process migration for a specific parallel branch-and-bound algorithm. These measurements are then compared with results attained with the construct for the implementation of distributed objects. Second, when using branch-and-bound to solve the Travelling Salesperson Problem (TSP), evaluation of the resulting parallel TSP program shows that some analytical and simulation results attained in past, published work may not hold. 相似文献
8.
Optimization of alcohol‐free beer production by lager and cachaça yeast strains using response surface methodology 下载免费PDF全文
Cláudia Puerari Jan Strejc Angélica C. Souza Marcel Karabín Rosane F. Schwan Tomáš Brányik 《Journal of the Institute of Brewing》2016,122(1):69-75
Alcohol‐free beers (AFBs) are an attractive segment of the beer market both for the brewing industry and for consumers. While AFBs produced by arrested/limited fermentation often suffer from a lack of volatile compounds, beer flavour can be improved by yeast selection and optimization of fermentation conditions. The yeast selection strategy was demonstrated by comparing traditional lager yeast with selected cachaça yeast strains. Correspondingly, response surface methodology was used to enhance the formation of the flavour‐active volatile compounds by optimization of the fermentation conditions (original wort extract, fermentation temperature, pitching rate). Statistical analysis of the experimental data revealed the relative significance of process variables and their interactions. The developed quadratic model describing the responses of total esters and higher alcohols to changes in process variables was used to predict the ideal fermentation conditions in terms of flavour formation. The predicted conditions were experimentally verified and alternative strategies of AFB production are suggested. Copyright © 2016 The Institute of Brewing & Distilling 相似文献
9.
Bacteria, yeasts and filamentous fungi were isolated during natural coffee processing. Bacteria were isolated in greater numbers at the beginning of the fermentation, when the moisture of the coffee beans was around 68%. Gram-positive bacteria represented 85.5% of all bacteria isolated, and Bacillus was the predominant genus (51%). Gram-negative species of the genera Serratia, Enterobacter and Acinetobacter were also found. Approximately 22% of 940 randomly chosen isolates of microorganisms were yeasts. Debaryomyces (27%), Pichia (18.9%) and Candida (8.0%) were the most commonly found genera, and these three genera tended to appear more often as the fruit was fermented and dried. Aspergillus was the most abundant genus besides Penicillium, Fusarium and Cladosporium, with 42.6% of the total fungi isolates. The genera and species identified included members known to have pectinase and cellulase activities. Of the 10 organic acids analyzed and quantified in coffee beans, acetic and lactic acids may have been generated by microbial activity. Butyric acid was not detected in any sample. 相似文献
10.
Samer El Oukaili Michael Schwan Stefan Federlein 《Electrical Engineering (Archiv fur Elektrotechnik)》2009,90(8):569-576
Liberalization has increased economic pressure on network operators, urging them to compromise between cost savings and supply
reliability. In this context, the detailed and quantitative evaluation of supply reliability is gaining ever more importance—especially
its application in comprehensive asset management methods. However, the large number of components especially in medium voltage
distribution networks leads to high computation times for such probabilistic reliability analyses. A recent research project
deals with investigations into a forecast of system supply reliability performance following a simplified methodology. Developing
different forecasting methods, also several aspects of significant importance for the calculation of supply reliability in
MV distribution systems in general were identified. Especially for electrical networks of a certain size, the overlapping
of independent single failures, as well as complex failures play an important role. This paper presents the background of
the reliability centered asset management approach as well as the general idea and different approaches to the forecasting
methods in theory briefly. Following, the application on two different example networks demonstrates the approaches and the
achieved results, and reveals also the relevance of overlapping and complex failures in these results. 相似文献