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| 1 | An expert system based algorithm for short term load forecasting显示文摘 | S.Rahman R.Bhatnager | | 0，，02： | 1 |
| 2 | Peak load forecasting using a fuzzy neur~network显示文摘 | P.K.Dash A.C.Liew S.Rahman | | 0，，32： | 1 |
| 3 | Formation of Nano/Ultrafine Grains in AISI 321 Stainless Steel Using Advanced Thermo-Mechanical Process显示文摘Production of nano/ultrafine grains through deformation-induced martensite formation and its reversion to austenite in an AISI 321 stainless steel was studied.The repetitive cold rolling and subsequent annealing were conducted to obtain nanocrystalline structure.Heavy cold rolling(90% reduction) at ?20 and-20 °C was carried out to induce the formation of a9-martensite from metastable austenitic material.The process was followed by annealing treatment at700–900 °C for 0.5–30 min.Effects of process parameters,i.e.,‘‘reduction percentage,'' ‘‘rolling temperature,'' ‘‘annealing temperature'' and ‘‘annealing time'',on the microstructural development were considered.Microstructural evolutions were conducted using feritscope,X-ray diffractometer and scanning electron microscope.Hardness of the specimens was measured by Vickers method.Results revealed that the higher thickness reduction and lower rolling temperature provided more martensite volume fraction and further hardness.X-ray diffraction patterns and feritoscopic results indicated that saturated strain(es) was reduced from 2.3 to 0.9 when temperature declined from ?20 to-20 °C.The smallest grain size(about 70 nm) was achieved in the condition of cold rolling at-20 °C followed by annealing at 750 °C for 5 min. | Mohsen Golzar Shahri S.Rahman Hosseini Mehdi Salehi | 2015 | Acta Metallurgica Sinica(English Letters)2015，28，4： | 1 |
| 4 | 通过多孔介质的二维磁流体力学方程组的全局正则性显示文摘本文的目的是研究以不断吹/吸方式通过孔道流体的二维磁流体动力学方程(MHD)弱解的全局正则性.为此,我们将利用抛物正则化过程和在流动模型中流体的的Darcy定律. | S.Rahman 朱茂春 | 2015 | 应用数学学报2015，38，1： | 0 |
| 5 | A Finite Element Method for Modelling Electromechanical Wave Propagation in Anisotropic Piezoelectric Media显示文摘We describe and evaluate a numerical solution strategy for simulating surface acoustic waves(SAWs)through semiconductor devices with complex geometries.This multi-physics problem is of particular relevance to the design of SAW-based quantum electronic devices.The mathematical model consists of two coupled partial differential equations for the elastic wave propagation and the electric field,respectively,in anisotropic piezoelectric media.These equations are discretized by the finite element method in space and by a finite difference method in time.The latter method yields a convenient numerical decoupling of the governing equations.We describe how a computer implementation can utilize the decoupling and,via object-oriented programming techniques reuse independent codes for the Poisson equation and the linear time-dependent elasticity equation.First we apply the simulator to a simplified model problem for verifying the implementation,and thereafter we show that the methodology is capable of simulating a real-world case from nanotechnology,involving SAWs in a geometrically non-trivial device made of Gallium Arsenide.PACS:02.70.Dh,41.20.Jb,46.25.Hf Key words:Finite element method,piezoelectric surface acoustic waves,Gallium Arsenide. | S.Rahman H.P.Langtangen C.H.W.Barnes | 2007 | Communications in Computational Physics2007，2，2： | 0 |
| 6 | Effect of annealing on properties of Mg doped Zn-ferrite nanoparticles显示文摘A comparison of structural and magnetic properties of as-prepared and annealed(900 1C) Mg doped Zn ferrite nanoparticles(Zn1 xMgxFe2O4,with x=0, 0.1, 0.2, 0.3, 0.4 and 0.5) is presented. X-ray diffraction(XRD) studies confirmed the cubic spinel structure for both the as-prepared and annealed nanoparticles. The average crystallite size and lattice parameter were increased by annealing. Scanning electron microscopy(SEM)images also showed that the average particle size increased after annealing. Fourier transform infrared spectroscopy(FTIR) also confirmed the spinel structure for both series of nanoparticles. For both annealed and as-prepared nanoparticles, the O–Mtet.–O vibrational band shifts towards higher wave numbers with increased Mg concentration due to cationic rearrangement on the lattice sites. Magnetization studies revealed an anomalous decreasing magnetization for the annealed nanoparticles which is also ascribed to cationic rearrangement on the lattice sites after annealing. The measurement of coercivity showed a decreasing trend by annealing due to the increased nanoparticle size and better crystallinity. | K.Nadeem S.Rahman M.Mumtaz | 2015 | Progress in Natural Science:Materials International2015，25，2： | 0 |
| 7 | An extended J-integral for evaluating fluid-driven cracks in hydraulic fracturing显示文摘J-integral has served as a powerful tool in characterizing crack tip status. The main feature, i.e. pathindependence, makes it one of the foremost fracture parameters. In order to remain the pathindependence for fluid-driven cracks, J-integral is revised. In this paper, we present an extended J-integral explicitly for fluid-driven cracks, e.g. hydraulically induced fractures in petroleum reservoirs, for three-dimensional(3 D) problems. Particularly, point-wise 3 D extended J-integral is proposed to characterize the state of a point along crack front. Besides, applications of the extended J-integral to porous media and thermally induced stress conditions are explored. Numerical results show that the extended Jintegral is indeed path-independent, and they are in good agreement with those of equivalent domain integral under linear elastic and elastoplastic conditions. In addition, two distance-independent circular integrals in the K-dominance zone are established, which can be used to calculate the stress intensity factor(SIF). | Huifang Song Sheik S.Rahman | 2018 | Journal of Rock Mechanics and Geotechnical Engineering2018，10，5： | 0 |
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