全文获取类型
收费全文 | 364篇 |
免费 | 23篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 1篇 |
化学工业 | 84篇 |
金属工艺 | 6篇 |
机械仪表 | 1篇 |
建筑科学 | 11篇 |
能源动力 | 17篇 |
轻工业 | 49篇 |
无线电 | 35篇 |
一般工业技术 | 89篇 |
冶金工业 | 31篇 |
原子能技术 | 6篇 |
自动化技术 | 58篇 |
出版年
2024年 | 1篇 |
2023年 | 3篇 |
2022年 | 12篇 |
2021年 | 16篇 |
2020年 | 16篇 |
2019年 | 12篇 |
2018年 | 15篇 |
2017年 | 26篇 |
2016年 | 9篇 |
2015年 | 11篇 |
2014年 | 14篇 |
2013年 | 30篇 |
2012年 | 23篇 |
2011年 | 18篇 |
2010年 | 15篇 |
2009年 | 20篇 |
2008年 | 15篇 |
2007年 | 20篇 |
2006年 | 15篇 |
2005年 | 14篇 |
2004年 | 11篇 |
2003年 | 7篇 |
2002年 | 11篇 |
2001年 | 7篇 |
2000年 | 6篇 |
1999年 | 2篇 |
1998年 | 5篇 |
1997年 | 3篇 |
1996年 | 4篇 |
1995年 | 5篇 |
1994年 | 4篇 |
1992年 | 2篇 |
1989年 | 8篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有388条查询结果,搜索用时 38 毫秒
1.
Recently, an increasing number of works start investigating the combination of fog computing and electronic health (ehealth) applications. However,
there are still numerous unresolved issues worth to be explored. For instance,
there is a lack of investigation on the disease prediction in fog environment
and only limited studies show, how the Quality of Service (QoS) levels of fog services and the data stream mining techniques influence each other to improve the
disease prediction performance (e.g., accuracy and time efficiency). To address
these issues, we propose a fog-based framework for disease prediction based
on Medical sensor data streams, named FogMed. This framework aims to
improve the disease prediction accuracy by achieving two objectives: QoS guarantee of fog services and anomaly prediction of Medical data streams. We build a
virtual FogMed environment and conduct comprehensive experiments on the public ECG dataset to validate the performance of FogMed. The experiment results
show that it performs better than the cloud computing model for processing tasks
with different complexities in terms of time efficiency. 相似文献
2.
Piyachai Khomein Subramani Swaminathan Elizabeth R. Young S. Thayumanavan 《Journal of Inorganic and Organometallic Polymers and Materials》2018,28(2):407-413
Incorporation of a pyrene chromophore on the surface of polymeric nanoparticles results in its fluorescence enhancement. Quantum yield and lifetime measurements suggest that the enrichment in fluorescent signal is due to the increase in the rigidity of the environment surrounding the fluorophores and that it is dependent on the particle size. 相似文献
3.
Solids transport models comparison and fine‐tuning for horizontal,low concentration flow in single‐phase carrier fluid 下载免费PDF全文
Frits Byron Soepyan Selen Cremaschi Cem Sarica Hariprasad J. Subramani Gene E. Kouba 《American Institute of Chemical Engineers》2014,60(1):76-122
We determined and fine‐tuned the solids transport models appropriate for predicting the single‐phase carrier fluid velocity to transport solid particles in conduits for horizontal, low concentration flow. A database with 538 experimental data points was compiled. A literature review was performed to determine the data ranges, forces, and mechanisms used to develop 44 models, and their velocity predictions were compared against the database using statistics. Using the dimensionless forms of the models and the data, the model parameters were adjusted to improve their accuracy and identify the dominant forces. At low concentrations: for liquid/solid flow from a bed of solids and gas/solid flow from the bottom of pipelines, the particle weight, and inertial and viscous forces dominate; for gas/solid flow from a bed of solids, the particle weight, and inertial, viscous, and adhesive forces play a role; and gaps exist in the data for large‐diameter pipes and high‐density gases. © 2013 American Institute of Chemical Engineers AIChE J, 60: 76–122, 2014 相似文献
4.
Grid operation and planning challenges arising out of large-scale integration of renewable power can to a large extent be solved by the use of energy storage systems (ESSs). The type and size of storage to be used may be decided by the amount of fluctuating power the storage charges or discharges to attain its objective. Storage systems can be used as single devices or as hybrid systems where two or more devices complement the working of each other. The objective of this paper is to find an accurate power and energy sizing methodology for storage devices working in a single or hybrid arrangement such that the power fed to the grid from a wind turbine generator is regulated to a constant value. A strategy for sizing of a hybrid ESS is proposed by choosing the long-term storage to be a battery energy system and the short-term device to be a flywheel and using frequency analysis techniques. In the case of flywheel energy storage system, the inertia and the gain of an integral controller applied to an induction-machine-based flywheel are obtained. The simulations are done in MATLAB. 相似文献
5.
An attempt is made to examine the effect of hybrid nanocoolant in microchannel heat sink for computer cooling.Two-hybrid coolants with graphene as one of the prime components are synthesized and images of the particles are shown using scanning electron microscopy(SEM) and transmission electron microscopy(TEM). Heat transfer properties like thermal conductivity of the hybrid fluid, specific heat, density, and viscosity are evaluated experimentally and theoretically. The heat transfer characteristics are also studied in heat sink channels of micro level in the processors of personal computers. The parameters like internal heat transfer coefficient, thermal resistances and base temperature representing the processor temperature are examined for the applied heater power of 325 W. The coolant dilution was varied in the range of 0.05 vol%, 0.075 vol% and 0.1 vol% and the base temperature is noted. The recorded lowest base temperature is 310.01 K for the concentration of 0.1 vol%graphene-iron oxide(GFO) system for 0.5 mm fin spacing for the graphene-iron oxide hybrid coolant and for graphene oxide–iron oxide(GOFO) hybrid coolant it is 311.24 K for the same operating conditions. 相似文献
6.
Sarita Yadav Vinita Yadav Sudha Yadav Kapil D.S. Yadav 《International Journal of Food Science & Technology》2012,47(2):290-298
An α‐l ‐rhamnosidase secreted by Penicillium citrinum MTCC‐8897 has been purified to homogeneity from the culture filtrate of the fungal strain using ammonium sulphate precipitation and cation‐exchange chromatography on carboxymethyl cellulose. The sodium dodecyl sulphate/polyacrylamide gel electrophoresis analysis of the purified enzyme gave a single protein band corresponding to the molecular mass 51.0 kDa. The native polyacrylamide gel electrophoresis also gave a single protein band confirming the enzyme purity. The Km and Vmax values of the enzyme for p‐nitrophenyl α‐l ‐rhamnopyranoside were 0.36 mm and 22.54 μmole min?1 mg?1, respectively, and kcat value was 17.1 s?1 giving kcat/Km value of 4.75 × 104 m ?1 s?1. The pH and temperature optima of the enzyme were 7.0 and 60 °C, respectively. The purified enzyme liberated l ‐rhamnose from naringin, rutin, hesperidin and wine, indicating that it has biotechnological application potential for the preparation of l ‐rhamnose and other pharmaceutically important compounds from natural glycosides containing terminal α‐l ‐rhamnose and also in the enhancement of wine aroma. 相似文献
7.
Nonclassical light and collapse-revival dynamics are consequences of dynamical quantum interference in transient photon-atom interaction. We study the time evolution of atom and photons in a high quality cavity for time-dependent atom-field coupling, with different initial field states and initial atomic states. The inversion for initial superposed atomic state seems to be independent of initial classical fields but can be stimulated by the Schrodinger cat field. Interesting effects of the transient coupling are found through analysis of the collapse-revival in population inversion and the features in the Wigner function. Oscillatory coupling coefficient can prolong the occurrence of collapse, in analogy to the Zeno effect. The intensity atom-field coupling duration is an important parameter for controlling atomic inversion and producing frozen nonclassical light in the cavity after the atom-field coupling ceases. 相似文献
8.
9.
Stolyarov V. V. Frolova A. V. Tilak Kumar J. V. Sudha J. 《Metal Science and Heat Treatment》2021,63(5-6):334-340
Metal Science and Heat Treatment - The TRIP effect and deformation behavior of metastable austenitic steel were studied under tension in the temperatures range from –120 to +200°C. The... 相似文献
10.
Rapid Coating of Surfaces with Functionalized Nanoparticles for Regulation of Cell Behavior 下载免费PDF全文