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排序方式: 共有52条查询结果,搜索用时 15 毫秒
1.
Memari Pedram Mohammadi Seyedeh Samira Jolai Fariborz Tavakkoli-Moghaddam Reza 《The Journal of supercomputing》2022,78(1):93-122
The Journal of Supercomputing - Recently, with the expansion of communications and generated data, the need for processing this high volume of data in minimum time and maximum speed has increased.... 相似文献
2.
Tadesse Desta Gebregziabher Kahsay Pooran Singh 《Journal of Superconductivity and Novel Magnetism》2016,29(6):1433-1438
This work focuses on the theoretical investigation of the coexistence of superconductivity and spin density wave (SDW) in ferropnictide Ba1?x K x Fe2As2. By developing a model Hamiltonian for the system and by using quantum field theory Green’s function formalism, we have obtained mathematical expressions for superconducting transition temperature (T C), spin density wave transition temperature (T sdw), superconductivity order parameter (ΔSc), and spin density wave order parameter (Δsdw). By employing the experimental and theoretical values of the parameters in the obtained expressions, phase diagrams of superconducting transition temperature (T C) versus superconducting order parameter (ΔSc) and spin density wave transition temperature (T sdw), versus spin density wave order parameter (Δsdw) have been plotted. By combining the two phase diagrams, we have demonstrated the possible coexistence of superconductivity and spin density wave (SDW) in ferropnictide Ba1?x K x Fe2As2. 相似文献
3.
Tantalum oxide (Ta2O5) is a promising high dielectric constant material for the DRAM applications because of its ease of integration compared to
other complex oxide dielectrics. The dielectric constant and thermal stability characteristics of bulk Ta2O5 samples were reported to enhance significantly through small substitutions of Al2O3. However, this improvement in the dielectric constant of (1-x)Ta2O5-xAl2O3 is not clearly understood. The present research attempts to explain the higher dielectric constant of (1-x)Ta2O5-xAl2O3 by fabricating thin films with enhanced dielectric properties. A higher dielectric constant of 42.8 was obtained for 0.9Ta2O5–0.1Al2O3 thin films compared to that reported for pure Ta2O5 (25–30). This increase was shown to be closely related to a-axis orientation. Pure Ta2O5 thin films with similar a-axis orientation also exhibited a high dielectric constant of 51.7, thus confirming the orientation
effect. The leakage current properties and the reliability characteristics were also found to be improved with Al2O3 addition.
Received: 24 November 1998 / Reviewed and accepted: 7 December 1998 相似文献
4.
We have employed Monte Carlo simulations in the osmotic ensemble to study the solubility of three different gases (N2, CH4, CO2) in polyethylene. The simulations are performed at temperatures below the polymer melting point. Although under such conditions, polyethylene is in a semicrystalline state, we have used simulation boxes containing only a purely amorphous material. We show that under such circumstances, computed solubilities are 4-5 times larger than experimental data. We therefore introduce an original use of the osmotic ensemble to implicitly account for the effects of the complex morphology of semicrystalline materials on gas solubility. We have made the assumption that i) the network formed by polymer chains trapped between different crystallites and ii) the changes in local density from crystalline regions to purely amorphous regions, may be both represented by an ad-hoc constraint exerted on the amorphous phase. A single constraint value emerges, independent of the gas nature, characteristic of the crystalline degree of the polymer. It is concluded that the role of this constraint is mostly to reproduce the effective density of the permeable phase of the real material, indirectly giving insights into the morphology of a semicrystalline polymer. 相似文献
5.
Mazeyar Parvinzadeh Naser Memari Mohammad Shaver Bashir Katozian Saeed Ahmadi Issa Ziadi 《Journal of surfactants and detergents》2010,13(2):135-141
In recent years, the textile industry has been forced to develop new technologies to reduce energy and water consumption.
The use of ultrasound in textile wet processing is one solution to this problem. The aim of this work was to investigate the
effects of ultrasonic energy on the processing of cotton with a cationic softener. For this purpose, cotton fabric was treated
with a fatty acid amide derivative cationic softener in water using ultrasonic energy during treatment. The physical properties
of the fabrics treated under different conditions are discussed. The results show that the treatment of fabrics with softeners
in an ultrasound bath is more effective compared to conventional methods and that it enhances the physical properties of the
cotton. 相似文献
6.
Pooran Koli 《Applied Solar Energy》2014,50(2):67-73
Photogalvanic cells are electrochemical devices capable of solar power generation and storage using solution of photosensitizer(s) and reductant(s) in alkali medium. These cells are cheap, renewable, and promising energy devices for the future, provided there electrical performance is further improved. The present study of photogalvanics of Naphthol Green B dye photosensitizer with Fructose as reductant and Sodium Lauryl Suphate as surfactant in alkaline medium was undertaken with aim of finding relatively better combination of chemicals like photosensitizer, reductant and surfactant for further improvement in electrical performance of these cells. This combination of chemicals has shown very impressive and surprisingly very high improvement in cell performance. The optimum conditions for cell have also been observed for optimal cell performance. The maximum power, short-circuit current, open-circuit potential, efficiency and storage capacity (as half change time) has been observed of the order of 422.4 μW, 1850 μA, 1040 mV, ~10.6%, and 260 min, respectively. 相似文献
7.
Expressions for the factor K to relate the total frictional head loss, average outlet operating pressure head, and the inlet pressure head of a multioutlet pipeline are developed. In the developed expressions, the factor K is a function of the number of outlets on different pipe diameters, combination of diameters, and position of the first outlet from the inlet. Values of the factor K obtained from the developed expressions are compared with constant values being taken as per existing practice. The comparison suggests using the developed expressions for accurate computation of the factor K for multioutlet pipelines especially comprising of two or more diameters. An example is presented to compute the inlet pressure head of a multioutlet pipeline using the factor K. 相似文献
8.
An approach for highway bridge design force computation based on three-dimensional finite element analysis is suggested. The implementation of the adjoint method of influence coefficient computation in a typical finite element analysis program is discussed. Deficiency of the adjoint method as applied to bridge design is identified and a remedy is suggested. Through a numerical example, the advantage of the suggested procedure over the conventional approach is shown 相似文献
9.
Pooran Golkar Sahar Kalani Ali Reza Allafchian Hassan Mohammadi Seyed Amir Hossein Jalali 《应用聚合物科学杂志》2019,136(32):47852
Electrospinning is a well-known technique for producing nanofibers using synthetic and natural polymers like mucilage. In this study, Plantago major Mucilage (PMM) was blended with polyvinyl alcohol (PVA) as a nontoxic adding agent, in order to produce electrospun nanofiber. Electrospinning parameters (voltage, tip-to-collector distance, feed rate, and PMM/PVA ratio) were optimized and solution properties were analyzed. The morphology of nanofibers was investigated using scanning electron microscopy (SEM), Fourier transform infrared (FTIR), X-ray diffraction (XRD), and Brunauer–Emmett–Teller (BET). Mechanical strength of nanofibers was determined, and cell viability on nanofibers was discussed by MTT assay. The results of SEM indicated that the PMM/PVA (50/50) nanofibers obtained with average diameter of 250 nm. Viscosity, electrical conductivity, and surface tension of PMM/PVA solution were 550 Cp, 575 μS/cm, and 47.044 mN/m, respectively. FTIR and XRD results verified the exiting PMM in produced nanofibers and no chemical reaction between PMM and PVA. Improvement in mechanical strength and cell viability of nanofibers by adding PMM to PVA nanofibers indicated the potential application of PMM-based nanofibers for medical and food industries. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47852. 相似文献
10.