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1.
Zirconium(IV) tungstoiodophosphate has been synthesized under a variety of conditions. The most chemically and thermally stable
sample is prepared by adding a mixture of aqueous solutions of 0·5 mol L−1 sodium tungstate, potassium iodate and 1 mol L−1 orthophosphoric acid to aqueous solution of 0·1 mol L−1 zirconium(IV) oxychloride. Its ion exchange capacity for Na+ and K+ was found to be 2·20 and 2·35 meq g−1 dry exchanger, respectively. The material has been characterized on the basis of chemical composition, pH titration, Fourier
transform infrared spectroscopy (FTIR) and thermogravimetric analysis. The effect on the exchange capacity of drying the exchanger
at different temperatures has been studied. The analytical importance of the material has been established by quantitative
separation of Pb2+ from other metal ions. 相似文献
2.
Shakeel Peera 《电子设计应用》2008,(6)
引言HDTV、IPTV、VoD和YouTube市场不断扩大,与此同时,FPGA的功能也在增强,价格稳步下降,串行数字接口(SDI)标准定义了需要通过75Ω同轴电缆传送未压缩的数字视频信号,如果FPGA用于 相似文献
3.
During the recent years, there has been a tremendous growth in the development and deployment of multimedia based networked applications such as video streaming, IP telephony, interactive games, among others. These applications, in contrast to elastic applications such as email and data sharing, are delay and delay jitter sensitive but can tolerate certain level of packet loss. A vital element of end-to-end delay and delay jitter is the random queueing delays in network switches and routers. Analysis of robust mechanisms for buffer management at network routers needs to be carried out in order to reduce end-to-end delay for traffic generated by multimedia applications. In this context, a threshold based buffer management scheme for accommodating multiple class multimedia traffic in network routers has been analysed. This technique effectively controls the allocation of buffer to various traffic classes according to their delay constraints. The forms of the joint state probabilities, as well as basic performance measures such as blocking probabilities are analytically established at equilibrium. Typical numerical experiments are included to illustrate the credibility of the proposed mechanism in the context of different quality of service (QoS) grades for various network traffic classes. This model, therefore, can be used as a powerful tool to provide a required grade of service to a particular class of multimedia based web traffic in any heterogeneous network. 相似文献
4.
5.
Feroz A. Mir Shakeel u Rehman K. Asokan S. H. Khan G. M. Bhat 《Journal of Materials Science: Materials in Electronics》2014,25(3):1258-1263
The current–voltage (I–V) and optical characteristics of 4-hydroxy coumarin Schottky diode were investigated. The conventional methods related with device were used to extract the various diode parameters. From dielectric study low dielectric constant and loss was observed. From its optical study, an indirect allowed transition is shown by this compound. The optical band gap (E g ) was found to be around 3.78 eV. The observed properties shown by this molecule give a bright opportunity to explore its application for different organic devices. 相似文献
6.
In this study, a drilling experiment was conducted on titanium ASTM B265 Grade 2 material using PVD coated carbide inserts. Two types of coolants (Wet and LN2) were used. The variables in the experiment were feed rate (f) and cutting speed (Vc). The depth of the drilling was constant. Cutting temperature (T), thrust force (Ft), surface roughness (Ra), and the hole quality (circularity, cylindricity, and perpendicularity) were analyzed. The tool wear and chip morphology were studied. The result of the experiment indicates that there is 6–59% reduction in cutting temperature when LN2 is used, high thrust force values were recorded for LN2 coolant condition, surface roughness (Ra) values were higher for LN2 coolants. Hole quality is not favorable in LN2 coolant supply. 相似文献
7.
Structural and magnetic properties of Zn1-xcoxO nanorods prepared by microwave irradiation technique
Ahmed F Kumar S Arshi N Anwar MS Koo BH Lee CG 《Journal of nanoscience and nanotechnology》2012,12(2):1386-1389
We have successfully synthesized large-scale aggregative flowerlike Zn1-xCo(x)O (0.0 < or = x < or = 0.07) nanostructures, consisting of many branches of nanorods at different orientations with diameter within 100-150 nm (tip diameter approximately 50 nm) and length of approximately 1 microm. The rods were prepared using Zinc nitrate, cobalt nitrate and KOH in 180 Watt microwave radiation for short time interval. The synthesized nanorods were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), field emission transmission electron microscopy (FETEM) and DC magnetization measurements. XRD and TEM results indicate that the novel flowerlike nanostructures are hexagonal with wurtzite structure and Co ions were successfully incorporated into the lattice position of Zn ions in ZnO matrix. The selected area electron diffraction (SAED) pattern reveals that the nanorods are single crystal in nature and preferentially grow along [0 0 1] direction. Magnetic studies show that Zn1-xCo(x)O nanorods exhibit room temperature ferromagnetism. This novel nanostructure could be a promising candidate for a variety of future spintronic applications. 相似文献
8.
Shakeel Ahmed Qaisar Abbas Naqvi 《Journal of Infrared, Millimeter and Terahertz Waves》2009,30(10):1044-1052
An analytical solution for the scattering of electromagnetic plane waves from an infinitely long nihility cylinder, coated
with a double positive (DPS), double negative (DNG), epsilon negative (ENG), or mu negative (MNG) layer of uniform thickness
is presented. The solution is determined by solving the scalar wave equation in the cylindrical coordinates, for different
regions and applying the appropriate boundary conditions at the interfaces. Both TM and TE polarizations as incident plane
have been considered in the analysis. Comparison of behaviors of a coated nihility cylinder with a coated PEC cylinder has
been made. It is noted that two situations are more closer for DNG coating as compared to DPS coating. 相似文献
9.
Muhammad Ahsan Razaq Muhammad Rehan Muntazir Hussain Shakeel Ahmed Keum-Shik Hong 《Asian journal of control》2023,25(5):4096-4112
This paper investigates a local observer-based leader-following consensus control of one-sided Lipschitz (OSL) multi-agent systems (MASs) under input saturation. The proposed consensus control scheme has been formulated by using the OSL property, input saturation, directed graphs, estimated states, and quadratic inner-boundedness condition by attaining the regional stability. It is assumed that the graph always includes a (directed) spanning tree with respect to the leader root to develop matrix inequalities for investigating parameters of the proposed observer and consensus protocols. Further, a new observer-based consensus tracking method for MASs with saturation, concerning independent topologies for communicating outputs and estimates over the network, is explored to deal with a more perplexing and realistic situation. In contrast to the traditional methods, the proposed consensus approach considers output feedback and deals with the input saturation for a generalized class of nonlinear systems. The efficiency of the obtained results is illustrated via application to a group of five moving agents in the Cartesian coordinates. 相似文献
10.
Shakeel Peera 《电子设计应用》2008,(11)
引言由于载体和电缆供应商开始为客户大量提供三重播放和VoD服务,原始设备制造商投入更多的精力大量生产基于IP(Internet协议)的系统,包括PON、CMTS、IP DSLAM、多服务交换、其 相似文献