排序方式: 共有57条查询结果,搜索用时 343 毫秒
31.
Babak Kaboudin Saeed Emadi Hamid Norouzi 《Phosphorus, sulfur, and silicon and the related elements》2013,188(3):585-590
A simple, efficient, and general method has been developed for the synthesis of phosphorothioates through a one-pot reaction of alkyl halides with the mixture of diethyl phosphite in the presence of NH 4 OAc/S/CaO under solvent–free conditions. The anticholinesterase activities of eight different phosphorothioates were investigated on acetylcholinesterase from electric eel. 相似文献
32.
Bryllert T. Olsen A. Vukusic J. Emadi T.A. Ingvarson M. Stake J. Lippens D. 《Electronics letters》2005,41(3):131-132
A record conversion efficiency of 11.4% at 100 GHz using a heterostructure barrier varactor (HBV) quintupler is demonstrated. The quintupler is based on a microstrip circuit mounted in a full-height crossed-waveguide block. The nonlinear element consists of a planar HBV diode fabricated in InGaAs/InAlAs/AlAs epitaxial layers on an InP substrate 相似文献
33.
The use of iron oxide/amino-functionalized silica core–shell magnetic nanoparticles for preconcentration of Pb2+ followed by its consecutive atomic absorption spectrometry determination is described. Effects of various operating variables, namely, solution pH, initial Pb2+ concentration, contact time, adsorbent dosage, sample volume, concentration and volume of desorbing solution, and co-existing ions on solid-phase extraction (SPE) of Pb2+ were studied by batch equilibrium technique. The experimental adsorption data were well fitted to the Langmuir isotherm model. The Langmuir adsorption capacity and equilibrium time were found to be 100 mg g?1 and 20 min, respectively. The adsorption data were also fitted to kinetic pseudo-first-order and pseudo-second-order models. Kinetic studies showed that the adsorption followed pseudo-second-order model. Under the optimal SPE conditions, the enrichment factor, detection limit and relative standard deviation for determination of Pb2+ were found to be 211, 1 μg L?1, and 3.7 % for 50 μg L?1, respectively. The proposed method was successfully applied to the determination of lead in a real sample with satisfactory results. 相似文献
34.
The response of an interactive Mathieu–Duffing system in R
4, subjected to a harmonic excitation is investigated. For a deterministic circular frequency, chaotic behavior is observed.
Subsequently it is shown that when the excitation becomes stochastic, chaos is subsided and trajectories tend to a diffused
attracting set. The stabilizing effect of stochastic excitation is verified by finding the largest Lyapunov exponent for the
two cases. 相似文献
35.
Hybrid electric vehicle (HEV) technology provides an effective solution for achieving higher fuel economy, better performance, and lower emissions, compared with conventional vehicles. Plug-in HEVs (PHEVs) are HEVs with plug-in capabilities and provide a more all-electric range; hence, PHEVs improve fuel economy and reduce emissions even more. PHEVs have a battery pack of high energy density and can run solely on electric power for a given range. The battery pack can be recharged by a neighborhood outlet. In this paper, a novel integrated bidirectional AC/DC charger and DC/DC converter (henceforth, the integrated converter) for PHEVs and hybrid/plug-in-hybrid conversions is proposed. The integrated converter is able to function as an AC/DC battery charger and to transfer electrical energy between the battery pack and the high-voltage bus of the electric traction system. It is shown that the integrated converter has a reduced number of high-current inductors and current transducers and has provided fault-current tolerance in PHEV conversion. 相似文献
36.
Lukic S.M. Jian Cao Bansal R.C. Rodriguez F. Emadi A. 《Industrial Electronics, IEEE Transactions on》2008,55(6):2258-2267
The fuel efficiency and performance of novel vehicles with electric propulsion capability are largely limited by the performance of the energy storage system (ESS). This paper reviews state-of-the-art ESSs in automotive applications. Battery technology options are considered in detail, with emphasis on methods of battery monitoring, managing, protecting, and balancing. Furthermore, other ESS candidates such as ultracapacitors, flywheels and fuel cells are also discussed. Finally, hybrid power sources are considered as a method of combining two or more energy storage devices to create a superior power source. 相似文献
37.
Power Electronics and Motor Drives in Electric, Hybrid Electric, and Plug-In Hybrid Electric Vehicles 总被引:1,自引:0,他引:1
Emadi A. Young Joo Lee Rajashekara K. 《Industrial Electronics, IEEE Transactions on》2008,55(6):2237-2245
With the requirements for reducing emissions and improving fuel economy, automotive companies are developing electric, hybrid electric, and plug-in hybrid electric vehicles. Power electronics is an enabling technology for the development of these environmentally friendlier vehicles and implementing the advanced electrical architectures to meet the demands for increased electric loads. In this paper, a brief review of the current trends and future vehicle strategies and the function of power electronic subsystems are described. The requirements of power electronic components and electric motor drives for the successful development of these vehicles are also presented. 相似文献
38.
There is a clear trend in the automotive industry to use more electrical systems in order to satisfy the ever-growing vehicular load demands. Thus, it is imperative that automotive electrical power systems will obviously undergo a drastic change in the next 10-20 years. Currently, the situation in the automotive industry is such that the demands for higher fuel economy and more electric power are driving advanced vehicular power system voltages to higher levels. For example, the projected increase in total power demand is estimated to be about three to four times that of the current value. This means that the total future power demand of a typical advanced vehicle could roughly reach a value as high as 10 kW. In order to satisfy this huge vehicular load, the approach is to integrate power electronics intensive solutions within advanced vehicular power systems. In view of this fact, this paper aims at reviewing the present situation as well as projected future research and development work of advanced vehicular electrical power systems including those of electric, hybrid electric, and fuel cell vehicles (EVs, HEVs, and FCVs). The paper will first introduce the proposed power system architectures for HEVs and FCVs and will then go on to exhaustively discuss the specific applications of dc/dc and dc/ac power electronic converters in advanced automotive power systems. 相似文献
39.
NiMoO4 nanorods have been successfully synthesized by sonochemical method process by using Ni(CH3COO)2·4H2O and (NH4)6Mo7O24·4H2O as starting materials. Some parameters including ultrasonic power, ultrasonic irradiation time, stirring effect, solvent effect, and surfactant effect were investigated to reach optimum condition. The as synthesized nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmittance electron microscopy (TEM), photoluminescence (PL) spectroscopy, Fourier transform infrared (FT-IR) spectra and energy dispersive X-ray microanalysis (EDX). Facile preparation and separation are important features of this route. This work has provided a general, simple, and effective method to control the composition and morphology of NiMoO4 in aqueous solution, which will be important for inorganic synthesis methodology. 相似文献
40.
Mohammad Yousefi Mohammad Sabet Masoud Salavati-Niasari Hamid Emadi 《Journal of Cluster Science》2012,23(2):511-525
PbS and Bi2S3 nanostructures were synthesized successfully via a microwave approach. For synthesis of PbS nanoparticles, a new precursor, [bis(salisylate) lead (ΙΙ)]; [Pb(Hsal)2] was used. The products were characterized by X-ray diffraction, scanning electron microscopy, and photoluminescence spectroscopy. Thin film of Bi2S3 was prepared by doctor’s blade technique and solar cell made from ITO/Bi2S3/PbS/Pt layers. I–V characterization was investigated for this cell and fill factor, open circuit voltage and short circuit current values were obtained. 相似文献