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排序方式: 共有64条查询结果,搜索用时 15 毫秒
1.
Manoj Raama Varma N. D. Kataria 《Journal of Materials Science: Materials in Electronics》2007,18(4):441-446
Ba(Zn1/3Ta2/3)O3 has been prepared with different dopants that gave best microwave dielectric properties at room temperature. Effects of different
dopants on the low temperature microwave dielectric properties of BZT were investigated. With decrease in temperature, loss
tangent was found to decrease marginally and then increase at temperatures lower than 100 K. Increase in loss factor at lower
temperatures were found to be less for dopants with smaller ionic radii. Dielectric constant was found to be almost independent
of temperature. Temperature coefficient of resonant frequency slowly decreased from a positive value to negative value when
temperature was lowered. Temperature at which τf becomes zero was found to vary for different dopants. There is a temperature stable region for tanδ, ɛr and τf which varies for different dopants. 相似文献
2.
Shalu Kataria Yogendra L. Verma Himani Gupta Shishir K. Singh Nitin Srivastava Ravindra Dhar 《Polymer-Plastics Technology and Engineering》2020,59(9):952-958
ABSTRACTNano-composite polymer gel electrolytes (NPGEs) based on polymer poly(vinylidene fluoride-co-hexafluoropropylene) PVdF-HFP, ionic liquid, 1-butyl-3- methylimidazolium bis(trifluoromethanesulfonyl)imide BMIMTFSI, Li-salt along with the addition of SiO2 nanoparticles have been synthesized and characterized by various techniques. Prepared NPGEs show high room temperature ionic conductivity (~10?3 S/cm) and have a wide electrochemical window (ECW) (~3.3–3.5 V). The galvanostatic charge/discharge profile was studied by sandwiching best performing NPGEs between a LiFePO4 cathode and lithium metal anode. The specific discharge capacity of the cell (Li/NPGE/LiFePO4) room temperature at 0.1C rate is found to be 138 mAh/g. 相似文献
3.
Xiaonan Lu Saurabh Kataria William J. Brouwer James Z. Wang Prasenjit Mitra C. Lee Giles 《International Journal on Document Analysis and Recognition》2009,12(2):65-81
Authors use images to present a wide variety of important information in documents. For example, two-dimensional (2-D) plots
display important data in scientific publications. Often, end-users seek to extract this data and convert it into a machine-processible
form so that the data can be analyzed automatically or compared with other existing data. Existing document data extraction
tools are semi-automatic and require users to provide metadata and interactively extract the data. In this paper, we describe
a system that extracts data from documents fully automatically, completely eliminating the need for human intervention. The
system uses a supervised learning-based algorithm to classify figures in digital documents into five classes: photographs,
2-D plots, 3-D plots, diagrams, and others. Then, an integrated algorithm is used to extract numerical data from data points
and lines in the 2-D plot images along with the axes and their labels, the data symbols in the figure’s legend and their associated
labels. We demonstrate that the proposed system and its component algorithms are effective via an empirical evaluation. Our
data extraction system has the potential to be a vital component in high volume digital libraries. 相似文献
4.
Femtocells are destined to transform the way mobile operators build their cellular networks and grow their coverage and capacity. Femtocells are small base stations operating in the licensed cellular bands. They are so small and inexpensive, and transmit at such low power, that they are meant to be placed in individual homes and backhauled onto the operator?s network via conventional digital subscriber line (DSL) or cable broadband access (or, when available, fiber). 相似文献
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Momentum is building rapidly around femtocells, as several operators worldwide have commercially launched 3G femtocells. This will further accelerate during the course of 2010, with many more operators expected to deploy. As explained in the first part of this series, which appeared in the September 2009 issue of IEEE Communications Magazine, femtocells are small, inexpensive base stations operating in the licensed cellular bands; they are meant to be placed in individual homes or businesses, and backhauled onto the operator's network via wireline broadband access. 相似文献
7.
An 8-day-old newborn presented with non-bilious vomiting, upper abdominal fullness, and failure to pass meconium. Plain radiographs revealed gastric pneumatosis (GP). At operation, he was found to have a non-obstructive preduodenal portal vein, preampullary duodenal atresia, asplenia, and malrotation. The baby was treated by duodeno-duodenostomy without mobilizing the portal vein and correction of the malrotation according to Ladd's procedure. He made an uneventful recovery and the GP resolved spontaneously. The malformative process was believed to have occurred at or soon after the 5th week of gestation, and the GP probably resulted from intramural air tracking through mucosal tears caused by high intragastric pressure. 相似文献
8.
D.J. Mercer D. Mikolas J. Yurkon Sam M. Austin D. Bazin S. Gaff E. Kashy D. Kataria J.S. Winfield R.R. Betts D.J. Henderson A.L. Hallin M. Liu F.L.H. Wolfs 《Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment》1994,350(3):491-502
A large solid-angle array of Low Pressure Multi-Wire Proportional Counters (LPMWPCs) has been constructed as part of the ATLAS Positron Experiment (APEX). Eight three-element trapezoidal counters span 360° in φ and 20–68° in laboratory θ. Angle sensitivity in θ is provided by a transmission-line delay cathode, while the 24-fold segmentation provides angle sensitivity in φ. Details are given on the design of the counters and associated hardware. Performance of the counters is described, based on tests with scattered heavy ions ranging from 58Ni to 238U. 相似文献
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10.
Lopes Elio Jordan Kataria Shaolin Keshav Shashank Ikram Sumaiya Thaseen Ghalib Muhammad Rukunuddin Shankar Achyut Krichen Moez 《Wireless Networks》2022,28(7):3111-3125
Wireless Networks - In centralized video streaming platforms, the platform owner, rather than the content producer, controls most of the content uploaded on the centralized video... 相似文献