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Evaluation of Transmutation of ^137Cs（γ, n） 136Cs Using Ultra-Intense Lasers in Solid Targets

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Chinese Physics Letters 2006年第6期23卷 1434-1436页

作者： R. Sadighi-bonabi O. Kokabee Department of Physics Sharif University of Technology 11365-9161 Tehran Iran Department of Mechanical Engineering Sharif University of Technology 11365-9567 Tehran Iran Bonab Research Centre 56515-196 Bonab Azerbaijan province Iran

Relativistic electrons produced in ultra-intense laser-solid interaction generate highly collimated γ-ray beams through Bremsstrahlung that can be used to induce photonuclear reactions. Photonuclear transmutation （of （% n） type） of ^137 Cs, one of the hazardous nuclear wastes with half-life of 30.17 years which cannot be transmuted practically with neutron bombardment due to its very low neutron capture cross section, has been considered. Nuclear activity of produced 136Cs with half-life of 13.16 days has been evaluated analytically using available experimental data. With irradiating a ^137Cs sample by p-polarized laser light of 10^20 Wcm^-2 and the repetition rate of 10Hz for 30min, the activity of 0.24 Bq is obtained. It is found that intensity has a large effect in yield around 10^21 Wcm^-2. For similar laser with intensity of 5 ×10^21 Wcm^-2, the activity increases with a factor of 10^5.

关键词： Transmutation 137Cs(γ,n) Solid Targets

Investigation of a mutual interaction force at different pressure amplitudes in sulfuric acid

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Chinese Physics B 2011年第8期20卷 454-459页

作者： Nastaran Rezaee Rasoul Sadighi-bonabi Mona Mirheydari Homa Ebrahimi Department of Physics Sharif University of Technology11365-91TehranIran Department of Physics Islamic Azad University Central Tehran BranchTehranIran

This paper investiages the secondary Bjerknes force for two oscillating bubbles in various pressure amplitudes in a concentration of 95% sulfuric acid. The equilibrium radii of the bubbles are assumed to be smaller than 10 μm at a frequency of 37 kHz in various strong driving acoustical fields around 2.0 bars （1 bar=10^5 Pa）. The secondary Bjerknes force is investigated in uncoupled and coupled states between the bubbles, with regard to the quasi-adiabatic model for the bubble interior. It finds that the value of the secondary Bjerknes force depends on the driven pressure of sulfuric acid and its amount would be increased by liquid pressure amplitude enhancement. The results show that the repulsion area of the interaction force would be increased by increasing the driven pressure because of nonlinear oscillation of bubbles.

关键词： multi-bubble sonoluminescence secondary Bjerknes force coupled and uncoupled state,nonlinear oscillation

Electron trajectory evaluation in laser-plasma interaction for effective output beam

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Chinese Physics B 2010年第6期19卷 344-348页

作者： P. Zobdeh R. Sadighi-bonabi H. Afarideh Department of Physics Qom Branch Islamic Azad University Qom Iran Department of Physics Sharif University of Technology 11365-9567 Tehran Iran Department of Physics Amirkabir University of Technology Tehran Iran

Using the ellipsoidal cavity model, the quasi-monoenergetic electron output beam in laser-plasma interaction is described. By the cavity regime the quality of electron beam is improved in comparison with those generated from other methods such as periodic plasma wave field, spheroidal cavity regime and plasma channel guided acceleration. Trajectory of electron motion is described as hyperbolic, parabolic or elliptic paths. We find that the self-generated electron bunch has a smaller energy width and more effective gain in energy spectrum. Initial condition for the ellipsoidal cavity is determined by laser-plasma parameters. The electron trajectory is influenced by its position, energy and cavity electrostatic potential.

关键词： electron intense laser plasma accelerator laser wake field bubble regime wave breaking

A unique circular path of moving single bubble sonoluminescence in water

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Chinese Physics B 2011年第7期20卷 252-258页

作者： Rasoul Sadighi-bonabi Mona Mirheydari Homa Ebrahimi Nastaran Rezaee Lida Nikzad Department of Physics Sharif University of TechnologyTehran 11365-91Iran Department of Physics Islamic Azad University Central Tehran BranchTehran 14676-86831Iran Laser and Optics Research School Tehran 14676-86831Iran

Based on a quasi-adiabatic model, the parameters of the bubble interior for a moving single bubble sonoluminescence （m-SBSL） in water are calculated. By using a complete form of the hydrodynamic force, a unique circular path for the m-SBSL in water is obtained. The effect of the ambient pressure variation on the bubble trajectory is also investigated. It is concluded that as the ambient pressure increases, the bubble moves along a circular path with a larger radius and all bubble parameters, such as gas pressure, interior temperature and light intensity, increase. A comparison is made between the parameters of the moving bubble in water and those in N-methylformamide. With fluid viscosity increasing, the circular path changes into an elliptic form and the light intensity increases.

关键词： sonoluminescence bubble trajectory fluid viscosity bremsstrahlung

Investigating of the Microstructure and Mechanical Properties of Al-Based Composite Reinforced with Nano-Trioxide Tungsten via Accumulative Roll Bonding Process

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Open Journal of Metal 2017年第1期7卷 9-23页

作者： Jalal Kahani Khabushan Soheila Bazzaz bonabi R&D Department Oghab Afshan Industrial & Manufacturing Company Semnan Iran Faculty of Materials and Metallurgical Engineering Semnan University Semnan Iran

In the present investigation, an Al/WO3p metal matrix nanocomposite was fabricated by accumulative roll bonding (ARB) technique. Microstructural evaluation and mechanical properties of specimens were studied by Field Emission-Scanning Electron Microscopy, X-ray Diffraction, microhardness and tensile test. Several factors that affect uniform distribution of reinforcing particles were investigated. At the initial stages of ARB process particle free zones as well as particle clusters were observed in the microstructure of the composite. After 12 ARB cycles, a nanocomposite with a uniform distribution of nanoparticles was produced. It was shown that the tensile strength of the ARBed composite enhanced with the increasing number of ARB cycles. After the first cycle, a significant increase was observed in the tensile strength of nanocomposite in 2.0 percent volume of WO3p, from 89 MPa to 128 MPa (almost 1.4 times increase in strength). After the final cycle, the tensile strength value increased to 205 MPa (that is almost 2.3 times increase in strength) due to the strain hardening and grain refinement. The X-ray diffraction results showed that Al/WO3p nanocomposite with the average crystallite size of 41 nm was successfully attained after 12 cycles of the ARB process. Finally, observations revealed that the fracture mode in Al/WO3p nanocomposite was of type shearing ductile fracture with elongated shallow dimples.

关键词： Accumulative Roll Bonding Nanocomposite Microstructure Mechanical Properties

MoS_2纳米片/CdS纳米线复合光催化剂的制备及其光电化学和光催化活性研究（英文）

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Science China Materials 2018年第6期61卷 839-850页

作者：王红梅 Sara bonabi Naghadeh 李春鹤应露 A’Lester Allen 张金中 College of Biological Chemical Sciences and Engineering Jiaxing University Department of Chemistry and Biochemistry University of California Department of Physics and Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education Wuhan University

本论文通过两步水热法合成了MoS_2纳米片/CdS纳米线复合光催化剂.采用扫描电子显微镜、透射电子显微镜、X射线粉末衍射仪、拉曼光谱仪、X射线光电子能谱仪、比表面积分析仪、紫外可见漫反射光谱仪、荧光光谱方法和光电化学测试对复合光... 详细信息

本论文通过两步水热法合成了MoS_2纳米片/CdS纳米线复合光催化剂.采用扫描电子显微镜、透射电子显微镜、X射线粉末衍射仪、拉曼光谱仪、X射线光电子能谱仪、比表面积分析仪、紫外可见漫反射光谱仪、荧光光谱方法和光电化学测试对复合光催化剂进行了表征.研究表明复合光催化剂的性能和MoS_2负载量的多少密切相关.当MoS_2的负载量为5 mol%时复合光催化剂具有最优的光学、光电化学和光催化产氢活性.与纯的CdS纳米线相比,优化后的复合光催化剂以葡萄糖和乳酸为空穴牺牲剂,光电流提高了5.5倍,光催化产氢活性提高了74倍,这主要归因于MoS_2纳米片和CdS纳米线之间的紧密接触有利于提高电荷的分离效率.为了进一步理解光电化学和光催化活性提高的机理,采用瞬态吸收光谱仪深入探究了电荷分离和转移的动力学过程.该工作不仅涉及了具有优良光电化学和光催化活性的复合光催化剂的制备方法,而且展示了葡萄糖在光解水产氢中的应用.

关键词：复合光催化剂光催化活性 MoS2 光电化学制备方法纳米线纳米片 X射线光电子能谱仪