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| 1 | Observation of Magnetohydrodynamics Instabilities in Ion Berstein Wave and Lower-Hybrid-Current Driving Synergetic Discharges on HT-7 Tokamak显示文摘The normalized performance indicated by the product ofβNH89>2 was achieved by a combination of the lower hybrid current driving (LHCD) and the ion Berstein wave (IBW) heating in the HT-7 tokamak. More than 80% of the plasma current was sustained by the LHCD and the bootstrap current. Large edge pressure gradients were observed. The magnetohydrodynamic (MHD) instabilities were often driven to terminate the discharge or reduce the discharge performance, when the IBW resonant layer was near the rational surface. The resonant layer of the safety factor q=2 is located at 0.6 a with a = 27 cm being the minor radius. The width of magnetic island (the poloidal mode number m = 2) was about 2 cm. The plasma energy was reduced quickly by 30% by MHD instabilities. The behaviour of MIlD instabilities is reported. A large sawtooth activity (m = 1) was observed before inducing MIlD (m = 2). | MAOJian-Shan LUOJia-Rong SHENBiao ZHAOJun-Yu HULi-Qun ZHUYu-Bao XUGuo-Sheng M.Asif GAOXiang WANBao-Nian | 2004 | Chinese Physics Letters2004，21，7： | 3 |
| 2 | Some novel integration techniques to explore the conformable M-fractional Schrödinger-Hirota equation显示文摘The current study deals with exact soliton solutions for Schrödinger-Hirota(SH)equation via two modi-fied integration methods.Those methods are known as the improved(G/G)-expansion method and the Kudryashov method.This model is a generalized version of the nonlinear Schrödinger(NLS)equation with higher order dispersion and cubic nonlinearity.It can be considered as a more accurate approximation than the NLS equation in explaining wave propagation in the ocean and optical fibers.A novel deriva-tive operator named as the conformable truncated M-fractional is used to study the above mentioned model.The obtained results can be used in describing the Schrödinger-Hirota equation in some better way.Moreover the obtained results are verified through symbolic computational software.Also,the ob-tained results show that the suggested approaches have broaden capacity to secure some new soliton type solutions for the fractional differential equations in an effective way.In the end,the results are also explained through their graphical representations. | Asim Zafar M.Raheel M.Asif Kamyar Hosseini Mohammad Mirzazadeh Lanre Akinyemi | 2022 | Journal of Ocean Engineering and Science2022，7，4： | 0 |
| 3 | Hydrodynamics and Heat Transfer Analysis of Airflow in a Sinusoidally Curved Channel显示文摘For heat transfer enhancement in heat exchangers,different types of channels are often tested.The performance of heat exchangers can be made better by considering geometry composed of sinusoidally curved walls.This research studies the modeling and simulation of airflow through a 2πunits long sinusoidally curved wavy channel.For the purpose,two-dimensional Navier Stokes equations along with heat equations are under consideration.To simulate the fluid flow problem,the finite element-based software COMSOL Multiphysics 5.4 is used.The parametric study for Reynolds number from Re=100 to Re=1000 and the period of vibration P from 0 to 5 are observed.The surface plots,streamline patterns,contours,and graphs are presented for the velocity field magnitude,temperature,and pressure against the Reynolds number as well as period of vibration.The results are compared with various literature.It is found that due to the creation of periodic contraction regions the velocity magnitude of the flow is continuously increasing with the increase of Reynolds number,on the contrary the pressure is decreasing from inlet to outlet of the channel.Also,a periodic variation in the pressure distribution along the vibrating boundaries has been found with an average increase of 500%for the high Reynolds number.A novel work was done by expressing the rotation rate per second in terms of local Reynolds number for the recirculating regions found due to the periodic oscillation of the boundaries.The average temperature near the outlet where a fixed temperature is imposed initially is decreasing with an increase in Reynolds number.The convection process is weakened due to an increase of periodic vibration of boundaries. | Abid.A.Memon M.Asif Memon Kaleemullah Bhatti Thanin Sitthiwirattham Nichaphat Patanarapeelert | 2022 | Computers, Materials & Continua2022，，6： | 0 |
| 4 | HT—7超导托卡马克上离子玻恩斯坦波调制实验(英文)显示文摘离子玻恩斯坦波调制实验在HT—7超导托卡马克装置上完成了。在实验中观察到了约束改善的现象。在离子玻恩斯坦波调制时,用朗谬探针阵列研究了HT—7托卡马克刮削层的涨落和输运。在离子玻恩斯坦波调制时,密度涨落被明显抑制,同时由静电涨落引起的向外的粒子通量和热通量减少到零。刮削层中的极向扰动传播方向改变了。即在欧姆放电时,极向扰动传播方向是离子逆磁方向 在有离子玻恩斯坦波时,极向扰动传播似乎停止,产生了负的径向电场。杂质辐射被离子玻恩斯坦波调制阻止。大的MHD能能被离子玻恩斯坦波调制所抑制。由撕裂模引起的大破裂能够被延迟或被避免。重复多次的IBW脉冲可以进行扰动的解相关和约束改善的机理研究。 | 毛剑珊 徐国盛 P.Phillips 宋梅 赵燕平 高翔 M.Asif 罗家融 | 2003 | 科学技术与工程2003，3，5： | 0 |
| 5 | A Seismic Hazard Map Based on Geology and Shear-wave Velocity in Rawalpindi–Islamabad,Pakistan显示文摘The‘twin cities’district of Rawalpindi–Islamabad is among the most endangered seismic regions in Pakistan,with the seismic hazard assessed(0.32 g)to intensity IX MMI for a 475-year return period.A seismic hazard map for Rawalpindi–Islamabad is presented herein,based on 85 shear-wave velocity(VS)profiles obtained through geophysical H/V measurements and from the geological map of the region.Relationships between the average top thirty-meter shear-wave velocities(VS30)and surficial geological units have been determined.The peak ground acceleration(PGA)maps for 150,475 and 2475-year return periods were converted into a seismic intensity map.Intensity increments for different soils were used to compute PGA values for 150,475 and 2475-year return periods.Sites located on softer ground experienced a higher degree of damage from moderate earthquakes.Due to the presence of soft clay or liquefiable soil and lateral spreading,a few locations may be classified as hybrid sites class C and D.This map is a critical step in facilitating code-based site classification and seismic design throughout Rawalpindi–Islamabad.Although the seismic hazard map based on seismic intensities is no longer used in engineering geology,it is still important in seismological analysis and for civil protection purposes. | Sarfraz KHAN Muhammad WASEEM M.Asif KHAN | 2021 | Acta Geologica Sinica(English Edition)2021，95，2： | 0 |
| 6 | 高跨导AlGaN/GaN光电子异质结构场效应晶体管显示文摘报道了在光照下具有高跨导值(高达64mS/mm)的1μm栅 Al_(0.15)Ga_(0.85)N/GaN 异质结构场效应晶体管(HFET),解释了光照下器件跨导和电流的增加是由于沟道中产生的俘获正电荷和导电电子造成的。这些俘获正电荷和导电电子使器件沟道中二维电子气的表面密度增至2×10^(12)cm^(-3),因而降低了源的串联电阻。 | M.Asif Khan 芦卫 | 1996 | 半导体情报1996，33，5： | 0 |
| 7 | Structural and dielectric study of nano-crystalline single phase Sn1-xNixS(XNi=0-10%) showing room temperature ferromagnetism显示文摘SnS is a promising Ⅳ-Ⅵ semiconductor,which is very less explored for diluted magnetic semiconducting and dielectric applications.In this study,the Ni doping(x_(Ni)=0-10mol%) effects on SnS host lattice were investigated.A simple and low cost co-precipitation technique was employed to grow Ni doped SnS powders.The X-ray diffraction confirmed single phase orthorhombic structure with a nano-crystalline nature that was further verified through the surface structure observed by scanning electron microscopy.Near edge x-ray absorption fine structure spectroscopy revealed a shift in the Ni absorption edge towards higher energy,depicting the formation of Ni^(+3) oxidation state.The impedance measurements,in the frequency range 1 kHz to 20 MHz,depict that owing to the excellent sensitivity to the electromagnetic radiations at the low energy,the Ni doped SnS finds potential applications in various energy related devices.Vibrating sample magnetometer measurements have elucidated room temperature ferromagnetism,which depicts potential memory device applications. | B.Parveen M.Hassan S.Atiq S.Riaz S.Naseem M.Asif Toseef | 2017 | Progress in Natural Science:Materials International2017，27，3： | 0 |
| 8 | Density Modulation Experiments to Determine Particle Transport Coefficients on HT-7 Tokamak显示文摘The particle diffusion coefficient and the convection velocity were studied based on the density modulation using D_2 gas puffing on the HT-7 tokamak. The density was measured by a five-channel FIR interferometer. The density modulation amplitude was 10% of the central chord averaged background density and the modulation frequency was 10 Hz in the experiments. The particle diffusion coefficient (D) and the convection velocity (V) were obtained for different background plasmas with the central chord averaged | 揭银先 高翔 K.TANAKA R.SAKAMOTO K.TOI 刘海庆 高丽 M.ASIF 刘瑾 徐强 童兴德 程永飞 | 2006 | Plasma Science and Technology2006，8，2： | 0 |
| 9 | 生物植入用碳纳米管增强混合功能梯度材料的力学性能(英文)显示文摘利用羟基磷灰石(HA)、不锈钢316L(SS316L)和碳纳米管(CNT)制备生物医学植入体用混合功能梯度材料(FGM)。加入SS316L和CNT增强功能梯度材料离散层的HA制成三种不同类型的功能梯度材料。第一种功能梯度材料加入10%~40%(质量分数)的SS316L强化微米HA,浓度梯度为10%。第二种功能梯度材料,在第一种功能梯度材料的基础上加入0.5%(质量分数)的功能化碳纳米管。第三种功能梯度材料在第二种功能梯度材料的基础上加入微米HA和纳米HA(1:1)的混合物。所有类型的功能梯度材料在相似的压缩参数和烧结参数下,进行单轴压缩实验,并采用无压烧结技术进行烧结。结果表明,加入碳纳米管和纳米晶体HA提高了功能梯度材料的致密度。碳纳米管增强的功能梯度材料的硬度和断裂韧性增加,但是微米和纳米晶体HA增强的功能梯度材料的硬度和断裂韧性的增加更明显。 | M.Asif HUSSAIN Adnan MAQBOOL F.Ahmad KHALID Nabi BAKHSH Ali HUSSAIN Jamil Ur RAHMAN Jong Kyu PARK Tae Gone PARK Lee Jae HYUN Myong Ho KIM | 2014 | Transactions of Nonferrous Metals Society of China2014，24，S1： | 0 |
| 10 | Simulation of Non-Isothermal Turbulent Flows Through Circular Rings of Steel显示文摘This article is intended to examine the fluid flow patterns and heat transfer in a rectangular channel embedded with three semi-circular cylinders comprised of steel at the boundaries.Such an organization is used to generate the heat exchangers with tube and shell because of the production of more turbulence due to zigzag path which is in favor of rapid heat transformation.Because of little maintenance,the heat exchanger of such type is extensively used.Here,we generate simulation of flow and heat transfer using nonisothermal flow interface in the Comsol multiphysics 5.4 which executes the Reynolds averaged Navier stokes equation(RANS)model of the turbulent flow together with heat equation.Simulation is tested with Prandtl number(Pr=0.7)with inlet velocity magnitude in the range from 1 to 2 m/sec which generates the Reynolds number in the range of 2.2×10^(5) to 4.4×10^(5) with turbulence kinetic energy and the dissipation rate in ranges(3.75×10^(−3) to 1.5×10^(−2))and(3.73×10^(−3)−3×10^(−2))respectively.Two correlations available in the literature are used in order to check validity.The results are displayed through streamlines,surface plots,contour plots,isothermal lines,and graphs.It is concluded that by retaining such an arrangement a quick distribution of the temperature over the domain can be seen and also the velocity magnitude is increasing from 333.15%to a maximum of 514%.The temperature at the middle shows the consistency in value but declines immediately at the end.This process becomes faster with the decrease in inlet velocity magnitude. | Abid.A.Memon M.Asif Memon Kaleemullah Bhatti Kamsing Nonlaopon Ilyas Khan | 2022 | Computers, Materials & Continua2022，，3： | 0 |
| 11 | Electron Temperature Measurement Using PIN Diodes as Detectors to Record the X-ray Pulses from a Low-Energy Mather-Type Plasma Focus显示文摘In the experiment to determine the plasma electron temperature, a modified multichannel PIN diodes assembly is used as detectors to record the X-ray pulses from a low-energy Mather-type plasma focus device energized by a 32 μF, 15 kV (3.6 kJ) single capacitor, with deuterium as a filling gas. The ratio of the integrated bremsstrahlung emission transmitting through foils to the total incident flux as a function of foil thickness at various temperatures is obtained for foil absorbers of material. Using 3 μm, 6 μm, 9 μm,12 μm,15 μm and 18 μm thick aluminium absorbers, the transmitted X-ray flux is detected. By comparing the experimental and theoretical curves through a computer program, the plasma electron temperature is determined. Results show that the deuterium focus plasma electron temperature is about 800 eV. | M.Asif Amna Ikram | 2004 | Plasma Science and Technology2004，6，2： | 0 |
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