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Photon and positron production by ultrahigh-intensity laser interaction with various plasma foils

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Plasma Science and Technology 2021年第4期23卷 1-8页

作者： mamat Ali BAKE Arzigul ELAJI School of Physics Science and Technology Xinjiang UniversityUrumqi 830046People’s Republic of China

The generation ofγphotons and positrons using an ultrahigh-intensity laser pulse interacting with various plasma solid foils is investigated with a series of quantum electrodynamic particlein-cell(PIC)*** ultrahigh-intensity lasers interact with plasma foils,a large amount of the laser energy is converted intoγphoton *** simulation results indicate that for a fixed laser intensity with different foil densities,the conversion efficiency of the laser toγphotons and the number of produced photons are highly related to the foil *** determine the optimal foil density by PIC simulations for high conversion efficiencies as approximately 250 times the critical plasma density,and this result agrees very well with our theoretical *** different foil thicknesses are simulated and the effects of foil thickness onγphoton emission and positron production are *** results indicate that optimal foil thickness plays an important role in obtaining the desiredγphoton and positron production according to the foil density and laser ***,a relation between the laser intensity and conversion efficiency is present for the optimal foil density and thickness.

关键词： laser–plasma interaction positron generation γray emission nonlinear Compton scattering particle-in-cell(PIC)simulation

Brightγ-ray source with large orbital angular momentum from the laser near-criticalplasma interaction

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Plasma Science and Technology 2022年第9期24卷 15-23页

作者： mamat Ali BAKE Suo TANG Baisong XIE Xinjiang Key Laboratory of Solid State Physics and Devices Xinjiang UniversityUrumqi 830046Peopleʼs Republic of China School of Physics Science and Technology Xinjiang UniversityUrumqi 830046Peopleʼs Republic of China Key Laboratory of Beam Technology of the Ministry of Education and College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875Peopleʼs Republic of China College of Physics and optoelectronic Engineering Ocean University of ChinaQingdao 266100Peopleʼs Republic of China

We propose a new laser-plasma-based method to generate brightγ-rays carrying large orbital angular momentum by interacting a circularly polarized Laguerre–Gaussian laser pulse with a near-critical hydrogen plasma conflned in an over-dense solid *** the flrst stage of the interaction,it is found via fully relativistic three-dimensional particle-in-cell simulations that high-energy helical electron beams with large orbital angular momentum are *** the second stage,this electron beam interacts with the laser pulse reflected from the plasma disc behind the solid tube,and helicalγbeams are generated with the same topological structure as the electron *** results show that the electrons receive angular momentum from the drive laser,which can be further transferred to theγphotons during the ***γbeam orbital angular momentum is strongly dependent on the laser topological charge l and laser intensity a_(0),which scales as L_(γ)∝a_(0)~4.A short(duration of 5 fs)isolated helicalγbeam with an angular momentum of-3.3×10^(-14)kg m~2 s^(-1)is generated using the Laguerre–Gaussian laser pulse with l=*** peak brightness of the helicalγbeam reaches 1.22×10^(24)photons s^(-1)mm^(-2)mrad^(-2)per 0.1%BW(at 10 Me V),and the laser-to-γ-ray angular momentum conversion rate is approximately 2.1%.

关键词： laser plasma interaction Laguerre–Gaussian laser γ-ray emission orbital angular momentum particle-in-cell simulation

Two-stage γ ray emission via ultrahigh intensity laser pulse interaction with a laser wakefield accelerated electron beam

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Plasma Science and Technology 2020年第10期22卷 76-85页

作者： mamat Ali BAKE Aynisa TURSUN Aimierding AIMIDULA Baisong XIE School of Physics Science and Technology Xinjiang UniversityUrumqi 830046People's Republic of China Center for Theocratical Physics Xinjiang UniversityUrumqi 830046People's Republic of China Key Laboratory of Beam Technology of the Ministry of Education and College o f Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875People's Republic of China

In this study, we investigate the generation of twin γ ray beams in the collision of an ultrahigh intensity laser pulse with a laser wakefield accelerated electron beam using a particle-in-cell simulation. We consider the composed target of a homogeneous underdense preplasma in front of an ultrathin solid foil. The electrons in the preplasma are trapped and accelerated by the wakefield. When the laser pulse is reflected by the thin solid foil, the wakefield accelerated electrons continue to move forward and pass through the foil almost without influence from the reflected laser pulse or foil. Consequently, two groups of γ ray flashes, with tunable time delay and energy, are generated by the wakefield accelerated electron beam interacting with the reflected laser pulse from the foil as well as another counter-propagating petawatt laser pulse behind the foil. Additionally, we study the dependence of the γ photon emission on the preplasma densities, driving laser polarization, and solid foil.

关键词： laser plasma interaction wakefield acceleration γray emission particle-in-cell(PIC)simulation

Latent Heat Prediction of Nano Enhanced Phase Change Material by ANN Method

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Energy Engineering 2022年第3期119卷 847-861页

作者： Farzad Jaliliantabar Rizalman mamat Sudhakar Kumarasamy College of Engineering Department of Mechanical EngineeringUniversiti Malaysia PahangKuantan26300Malaysia Automotive Engineering Centre Universiti Malaysia PahangPekan26600Malaysia School of Mechanical Engineering Ningxia UniversityNingxia750000China Faculty of Mechanical and Automotive Engineering Technology Universiti Malaysia PahangPekan26600Malaysia Energy Center Maulana Azad National Institute of TechnologyBhopal462003India

Thermal characteristics of phase change material(PCM)are important in design and utilization of thermal energy storage or other *** have great latent heat but suffer from low thermal ***,in recent years,nano particles have been added to PCM to improve their thermophysical properties such as thermal *** of this nano particles on thermophysical properties of PCM has been a question and many experimental and numerical studies have been done to investigate *** intelligence-based approach can be a good candidate to predict thermophysical properties of nano enhance PCM(NEPCM).Then,in this study an artificial neural network(ANN)has been developed to predict the latent heat of the NEPCM.A comprehensive literature search was conducted to acquire thermal characteristics data from various NEPCM to train and test this artificial neural network *** different types of Nano particle and paraffin based PCMs were used in ANN *** most important properties which are used as the input for the developed ANN model are NP size,density of NP,latent heat of PCM,density of PCM,concentration and latent heat of NEPCM in the range of 1-60 nm,100-8960 kg/m^(3),89.69-311 kJ/kg,760 to 1520 kg/m^(3),0.02-20 wt%and 60.72-338.6 kJ/kg,*** output variable was latent heat of *** result indicates that the ANN model can be applied to predict the latent heat of nano enhanced PCM *** correlation coefficient of the created model was *** result shows ability of ANN to predict the latent heat of NEPCM.

关键词： NEPCM ANN latent heat prediction

Transnational Drug - related Crimes in Central Asia: Regional Criminal Law

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学术界 2013年第4期 265-273页

作者： mamat.Usman Yang Limin Law School Sichuan University

The cross - border drug - related crime has become one of the significant non - traditional security issues in Central Asian countries since the middle 1990. The prevention mechanism of the cross - border drug - related crime in Central Asia shall be formed based on the regional criminal law,in line with harmonious and uniform legislation,so as to settle the conflicts in jurisdiction and the issues in the international criminal judicial assistance,and make up for the defect of the existing prevention mechanism as well.

关键词：犯罪预防中亚国家毒品刑法安全问题和谐统一机制

Synthesis of Environmentally Friendly Multifunctional Metal (Calcium,Magnesium) oleate Detergent with Antioxidation Property

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China Petroleum Processing & Petrochemical Technology 2011年第3期13卷 64-68页

作者： Wang Yonglei mamat Xamxikamar Eli Wumanjiang Changzhou Institute of Chemistry Changzhou 213164 Xinjiang Technical Institute of Physics and Chemistry The Chinese Academy of Sciences Urumqi 830011

This article covers a method for synthesizing environmentally friendly multifunctional metal (calcium,magnesium) oleate detergents with antioxidation *** multifunctional metal (calcium,magnesium) oleate detergents with antioxidation property were synthesized using oil-soluble liquid antioxidants (PPIBP,PPIBTSTBP,and PPIBPDA) as reactive functional *** oil-soluble liquid antioxidants have the potential to be used as functional materials for application in synthesizing other kinds of substrate detergents.

关键词： oil-soluble liquid antioxidant calcium oleate magnesium oleate multifimctional detergent

Thermal expansion behavior,phase transitions and some physico-mechanical characteristics of fired doped rice husk silica refractory

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Journal of Advanced Ceramics 2013年第1期2卷 79-86页

作者： Benjamin Iyenagbe UGHEoKE othman mamat B.ARI-WAHJoEDI Department of Mechanical Engineering Universiti Teknologi PETRONASBandar Seri Iskandar 31750TronohPerakMalaysia Department of Fundamental and Applied Sciences Universiti Teknologi PETRONASBandar Seri Iskandar 31750TronohPerakMalaysia

This paper presents the findings on thermal expansion behavior of slaked lime doped rice husk silica(RHS)refractory monitored between 25℃and 1500℃.It also reports the phase transition analysis within the temperature range of 850-1450℃.A sudden expansion of 0.7%noticed at 220℃is due to the transformation ofα-cristobalite toβ-*** highest expansion(0.85%)reached within the temperature range of 650-850℃,remains almost constant for the investigated temperature range,and is not high enough to cause macro cracks in the *** phase transition order is similar to those reported for quartzite refractory after 600℃,though the crystallization temperature is lowered due to the presence of the *** of rupture,apparent porosity,bulk density,refractoriness and reheat change are reported and their results meet with the standards qualifying them for use in coke ovens.

关键词： rice husk silica refractory thermal expansion phase transitions physico-mechanical characteristics

Surfactant-decorated graphite nanoplatelets(GNPs) reinforced aluminum nanocomposites: sintering effects on hardness and wear

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International Journal of Minerals,Metallurgy and Materials 2018年第6期25卷 704-715页

作者： Zeeshan Baig othman mamat Mazli Mustapha Asad Mumtaz Sadaqat Ali Mansoor Sarfraz Department of Mechanical Engineering Universiti Teknologi PETRONAS Department of Fundamental and Applied Sciences Universiti Teknologi PETRONAS Sustainable Energy Technologies Center College of Engineering King Saud University

The exceptional properties of graphene make it ideal as a reinforcement to enhance the properties of aluminum matrices and this critically depends on uniform dispersion. In this study, the dispersion issue was addressed by sonication and non-covalent surface functionalization of graphite nanoplatelets（GNPs） using two types of surfactant： anionic（sodium dodecyl benzene sulfate（SDBS）） and non-ionic polymeric（ethyl cellulose（EC））. After colloidal mixing with Al powder, consolidation was performed at two sintering temperatures（550 and 620°C）. The structure, density, mechanical and wear properties of the nanocomposite samples were investigated and compared with a pure Al and a pure GNPs/Al nanocomposite sample. Noticeably, EC-based 0.5 wt% GNPs/Al samples showed the highest increment of 31% increase in hardness with reduced wear rate of 98.25% at 620°C, while a 22% increase in hardness with reduced wear rate of 96.98% at 550°C was observed, as compared to pure Al. Microstructural analysis and the overall results validate the use of EC-based GNPs/Al nanocomposites as they performed better than pure Al and pure GNPs/Al nanocomposite at both sintering temperatures.

关键词： graphite nanoplatelets (GNPs) aluminum nanocomposites surfactant hardness dispersion ultra-soincation sintering effects

Ni–Co bimetallic coordination effect for long lifetime rechargeable Zn–air battery

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Journal of Energy Chemistry 2020年第8期29卷 146-154,I0005页

作者： Mengfei Qiao Ying Wang Thomas Wagberg Xamxikamar mamat Xun Hu Guoan Zou Guangzhi Hu Key Laboratory of Xinjiang Indigenous Medicinal Plants Resource Utilization and Key Laboratory of Plant Resources and Chemistry in Arid RegionsXinjiang Technical Institute of Physics and ChemistryChinese Academy of SciencesUrumqi 830011XinjiangChina Department of Physics Umea UniversityS-90187 UmeaSweden School of Material Science and Engineering University of JinanJinan 250022ShandongChina University of Chinese Academy of Sciences Beijing 100049China

The development of bifunctional oxygen electrocatalysts with high efficiency, high stability, and low cost is of great significance to the industrialization of rechargeable Zn–air batteries. A widely accepted view is that the oxygen reduction reaction(oRR) and the oxygen evolution reaction(oER) follow different catalytic mechanisms, and accordingly they need different active sites for catalysis. Transition metal elements have admirable electronic acceptance ability for coordinating with reactants, and this can weaken the bond energy between reactants, thus promoting the oRR or oER reactions. Herein, the oRR and oER activities of different transition metal supported nitrogen-doped carbon nanotubes were systematically studied and compared. The optimal catalyst for synchronous oRR and oER was obtained by pyrolyzing melamine, cobalt nitrate, and nickel nitrate on carbon nanotubes, called cobalt–nickel supported nitrogenmixed carbon nanotubes(CoNi–NCNT), which were equipped with two types of high-performance active sites—the Co/Ni–N–C structure for the oRR and Co Ni alloy particles for the oER—simultaneously. Remarkably, the optimized Co Ni–NCNT exhibited a satisfactory bifunctional catalytic activity for both the oRR and oER. The value of the oxygen electrode activity parameter,△E, of CoNi–NCNT was 0.81 V, which surpasses that of catalysts Pt/C and Ir/C, and most of the non-precious metal-based bifunctional electrocatalysts reported in previous literatures. Furthermore, a specially assembled rechargeable Zn–air cell with Co Ni–NCNT loaded carbon paper as an air cathode was used to evaluate the practicability. As a result, a superior specific capacity of 744.3 mAh/gZn, a peak power density of 88 mW/cm2, and an excellent rechargeable cycling stability were observed, and these endow the Co Ni–NCNT with promising prospects for practical application.

关键词： Bifunctional catalysis oxygen reduction reaction oxygen evolution reaction Carbon nanotubes Zn–air battery