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Chinese physics C 2022年第8期46卷 72-90页

作者： S.D.Campos V.A.Okorokov Applied Mathematics Laboratory-CCTS/DFQM Federal University of São CarlosSorocaba CEP 18052-780Brazil moscow engineering physics institute National Research Nuclear University MEPhI115409 MoscowRussia

In this paper,we present some results on the behavior of the total cross section and p-parameter at asymptotic energies in proton-proton(pp) and antiproton-proton(pp) ***,we consider three of the main theoretical results in high energy physics:the crossing property,derivative dispersion relation,and optical *** use of such machinery facilitates the derivation of analytic formulas for a wide set of the measured global scattering parameters and some important relations between *** suggested parameterizations approximate the energy dependence for the total cross section and ρ-parameter for pp and pp with a statistically acceptable quality in the multi-TeV ***,the qualitative description is obtained for important interrelations,namely difference,sum,and ratio of the antiparticle-particle and particle-particle total cross *** the reduced number of experimental data for the total cross section and p-parameter at the TeV-scale,which complicates any prediction for the beginning of the asymptotic domain,the fitting procedures indicates that asymptotia occur in the energy range 25.5-130 ***,in the asymptotic regime,we obtain α_(P)=1.A detailed quantitative study of the energy behavior of the measured scattering parameters and their combinations in the ultra-high energy domain indicates that the scenario with the generalized formulation of the Pomeranchuk theorem is more favorable with respect to the original formulation of this theorem.

关键词： optical theorem derivative dispersion relations asymptotic behavior Pomeranchuk theorem

Characterization of functionalized multiwalled carbon nanotubes and application as an effective filter for heavy metal removal from aqueous solutions

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Chinese Journal of Chemical engineering 2016年第12期24卷 1695-1702页

作者： Emad.M.Elsehly N.G.Chechenin A.V.Makunin H.A.Motaweh E.A.Vorobyeva K.A.Bukunov E.G.Leksina A.B.Priselkova Skobeltsyn institute of nuclear physics Lomonosov Moscow State University Faculty of Science Damanhour University Faculty of physics Lomonosov Moscow State University

Filtration efficiency of Ni(II) from aqueous solution using pristine and modified MWCNTs filters was investigated as a function of Ni(II) ion concentration, p H, and filter mass. MWCNTs were synthesized by CVD method and modified using two complementary treatments, purification(using a mixture of hydrochloric acid and hydrogen peroxide) and functionalization(using nitric acid). The effect and mechanism of each treatment on the structural integrity of pristine MWCNTs has been studied. Morphology of the pristine and modified filters was investigated by Raman Spectrometry(RS), Scanning Electron Microscopy(SEM), Energy Dispersive X-ray Spectroscopy(EDS),Fourier Transform Infrared(FTIR) spectrometry and Thermogravimetric analysis. It was found from Raman spectra that the ratio of the intensity of D-band to that of G-band decreased by purification process, and increased by functionalization process. The adsorption mechanism of Ni(II) onto the surface functional groups of modified MWCNTs was confirmed by FTIR spectrum. The filtration results showed that the removal efficiency of Ni(II) is strongly dependent on pH and could reach 85% at pH = 8. Also, modified MWCNT filters can be reused through many cycles of regeneration with high performance. Functionalized MWCNTs filters may be a promising adsorbent candidate for heavy metal removal from wastewater.

关键词： MWCNTs filters Functionalization Nickel removal Filtration Raman spectrometry Purification

Rheological study of nanoparticle-based cationic surfactant solutions

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Petroleum 2022年第4期8卷 522-528页

作者： Ayomikun Bello Joy Ozoani Adewale Adebayo Dmitriy Kuriashov Skolkovo institute of Science and Technology MoscowRussia moscow engineering physics institute MoscowRussia Higher School of Economics MoscowRussia Kazan national research Technological university KazanRussia

Worm-like micelles are of special interest among the many forms of surfactant aggregates because of their usefulness in research and *** are elongated,flexible aggregates formed by amphiphilic molecules spontaneously self-organizing in *** nature of the surfactant determines its unique shape,which may be altered by mixing it with other substances or changing physicochemical variables like as temperature,pH,or *** rheology of viscoelastic fluid systems is currently being modified using *** method,which was just introduced about 10 years ago,has shown to be highly promising,producing significant improvements in rheological properties,particularly at reservoir *** goal of this research is to investigate and assess the rheology of an aqueous cationic surfactant solution based on graphene oxide *** thermodynamics,structure and rheology of nanoparticle-based cationic surfactant solutions were investigated *** to structural and thermodynamic investigations in surfactant-nanoparticle mixtures,micellenanoparticle interactions arise as physical crosslinks between *** existence of these interactions is shown to generate considerable viscosity and viscoelasticity in wormlike micelles,even when the fluid is Newtonian in the absence of *** viscosity,shear modulus and relaxation time all increase as particle concentration *** nanoparticles generates a network of micellar entanglements as a result of *** results demonstrate that adding nanoparticles to surfactant solutions provides for a one-of-a-kind method of altering fluid rheology under a range of circumstances.

关键词： Surfactant Wormlike micelles Nanoparticles Viscosity Modulus Rheology

Diffusion behavior of helium in titanium and the effect of grain boundaries revealed by molecular dynamics simulation

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Chinese physics B 2016年第7期25卷 349-355页

作者：程贵钧付宝勤侯氢周晓松汪俊 institute of nuclear physics and Chemistry China Academy of Engineering Physics Key Laboratory for Radiation physics and Technology Institute of Nuclear Science and Technology Sichuan University

The microstructures of titanium（Ti）, an attractive tritium（T） storage material, will affect the evolution process of the retained helium（He）. Understanding the diffusion behavior of He at the atomic scale is crucial for the mechanism of material degradation. The novel diffusion behavior of He has been reported by molecular dynamics（MD） simulation for the bulk hcp-Ti system and the system with grain boundary（GB）. It is observed that the diffusion of He in the bulk hcp-Ti is significantly anisotropic（the diffusion coefficient of the [0001] direction is higher than that of the basal plane）,as represented by the different migration energies. Different from convention, the GB accelerates the diffusion of He in one direction but not in the other. It is observed that a twin boundary（TB） can serve as an effective trapped region for *** TB accelerates diffusion of He in the direction perpendicular to the twinning direction（TD）, while it decelerates the diffusion in the TD. This finding is attributable to the change of diffusion path caused by the distortion of the local favorable site for He and the change of its number in the TB region.

关键词： diffusion grain boundary helium and titanium molecular dynamics

Thermal neutron flux produced by EAS at various altitudes

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Chinese physics C 2013年第1期37卷 66-69页

作者： Yu. V. Stenkin V. V. Alekseenko D. M. Gromushkin 刘烨马欣华赵静 institute for nuclear research of Russian Academy of Sciences moscow Physical engineering institute Hebei Normal university institute of High Energy physics of Chinese Academy of Sciences

The results of Monte-Carlo simulations of extensive air showers are presented to show the difference of the hadronic component content at various altitudes with the aim to choose an optimal altitude for a PRISMA-like experiment. The CORSIKA program for EAS simulations with QGSJET and GHEISHA models was used to calculate the number of hadrons reaching the observational level inside a circle of 50 m radius around the EAS axis. Then the number of neutrons produced by the hadronic component was calculated using an empirical relationship between the two components. We have tested the results with the ProtoPRISMA array at sea level, and recorded the neutrons which are consistent with the simulation results.

关键词： EAS detector neutrons altitudes

Formation of diamond powders from melamine under high pressure and high temperature

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Chinese physics C 2013年第8期37卷 80-83页

作者：房雷鸣陈喜平 H. Ohfuji T. Irifune 孙光爱陈波彭述明 institute of nuclear physics and Chemistry China Academy of Engineering Physics Geodynamics research Center Ehime University

High pressure pyrolysis of melamine has been attracting great interest recently, due to it being considered as a suitable precursor to realize the g-C3N4 and even superhard C3N4. In this work, we studied the detailed pyrolysis behavior of melamine at 22 GPa. Melamine was stable at 800℃, and decomposed to diamond in the form of powder at 1500-2000 ℃ under this pressure condition. At 2000℃, the pure cubic diamond powders with 0.1 0.5 μm grain size were obtained. The diamond particles exhibited euhedral forms and dispersed to each other, we proposed that these novel features were caused by the presence of liquid N2 and NH3 during diamond formation. The high pressure pyrolysis of melamine may provide a new means of producing micrometer-sized diamond powders.

关键词： melamine decomposition high pressure diamond powder

High damping in Fe-Ga-La alloys:Phenomenological model for magneto-mechanical hysteresis damping and experiment

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Journal of Materials Science & Technology 2021年第13期72卷 69-80页

作者： Meng Sun Anatoly Balagurov Ivan Bobrikov Xianping Wang Wen Wen Igor S.Golovin Qianfeng Fang Key Laboratory of Materials physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China Department of Materials Science and engineering University of Science and Technology of ChinaHefei 230026China Frank Laboratory of Neutron physics Joint Institute for Nuclear ResearchDubnaRussia Lomonosov moscow State university MoscowRussia Shanghai Advanced research institute Chinese Academy of SciencesShanghai 201204China national university of Science and Technology“MISIS” MoscowRussia

Ferromagnetic high damping(FHA)alloys with a wide temperature range from-150℃to 300℃have unique application value in extreme *** the present work,the damping behaviors of Fe-21 Ga-xLa(x=0.12 wt.%,0.24 wt.%,0.47 wt.%,1.18 wt.%,and 2.33 wt.%La)alloys have been studied in detail,and a new phenomenological model has been *** the increase of La content,the Laves phase(LaGa_(2))in the matrix increases gradually,and the resistance opposing the domain movement increases as *** with the results of synchrotron radiation X-ray diffraction,neutron diffraction,and magnetic domain observation,the resistance mainly comes from three parts:the average stress related to the lattice distortion of the matrix,the average stress related to the increasing area energy of domain walls(DWs),and the ave rage stress related to the increasing demagnetization energy induced by the Laves *** from the traditional method of reducing internal stress through annealing to improve the damping capacity,the proper internal stress barriers are necessary to Barkhausen jumps to dissipate ***,proper doping to balance resistance and mobility of DWs is a reliable way to improve damping ***,for Fe-Al and Fe-Cr based Alloys,the new model also has a good fitting *** study provides a theoretical and experimental reference for improving the functional properties of ferromagnetic alloys.

关键词： Magneto-mechanical hysteresis damping Laves phase(LaGa_(2)) Internal stress distribution Neutron-diffraction patterns Domain walls

Entropy and equilibrium property of QCD-instanton induced final state in deep-inelastic scattering

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Chinese physics C 2008年第1期32卷 13-17页

作者：邓为炳陆丁张纪英许明梅 Boris Levchenko 刘连寿 Training Base for research and Teaching in Fundamental Sciences(physics)College of Physical Science and Technology Huazhong Normal university institute of Particle physics Huazhong Normal university Skobeltsyn institute of nuclear physics moscow State university 119992 MoscowRussia

The scaling and additivity properties of Rényi entropy in rapidity space of the instanton final state （IFS） and current jet identified by the r-sorting method from the QCDINS Monte Carlo event sample are studied. Asymptotic scaling of the Rényi entropy H2 is observed for the IFS while H2 for the current jet jtends to saturation with decreasing phase space scale. Furthermore, it is found that the additivity of H2 holds well for the IFS in narrow rapidity windows at different positions. These results indicate that the IFS produced in the instanton-induced process of deep inelastic scattering has reached local equilibrium.

关键词： instanton quark-gluon fusion deep-inelastic scattering entropy local equilibrium

Tensor force impact on shell evolution in neutron-rich Si and Ni isotopes

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Chinese physics C 2024年第4期48卷 95-106页

作者： S.V.Sidorov A.S.Kornilova T.Yu.Tretyakova Faculty of physics Lomonosov Moscow State UniversityMoscow 119991Russia Skobeltsyn institute of nuclear physics Lomonosov Moscow State UniversityMoscow 119991Russia

The influence of the tensor interaction of nucleons on the characteristics of neutron-rich silicon and nickel isotopes was studied in this *** forces are considered within the framework of the Hartree-Fock approach with the Skyrme *** addition of a tensor component of interaction is shown to improve the description of the splittings between different single-particle states and decrease nucleon-nucleon pairing correlations in silicon and nickel *** attention was directed toward the role of isovector tensor forces relevant to the interaction of like nucleons.

关键词： nuclear shell model tensor interaction silicon isotopes nickel isotopes

Study of one-step and two-step neutron transfer in the reaction ^(6)Li+^(9)Be

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Chinese physics C 2024年第11期48卷 96-105页

作者： A.K.Azhibekov S.M.Lukyanov Yu.E.Penionzhkevich B.A.Urazbekov M.A.Naumenko V.V.Samarin T.Issatayev V.A.Maslov K.Mendibayev D.Aznabayev T.K.Zholdybayev A.Temirzhanov Joint institute for nuclear research DubnaRussia Korkyt Ata Kyzylorda university KyzylordaKazakhstan national research nuclear university MEPhI MoscowRussia L.N.Gumilyov Eurasian national university AstanaKazakhstan Dubna State university DubnaRussia institute of nuclear physics AlmatyKazakhstan Satbayev university AlmatyKazakhstan

This paper presents the results of experiments conducted to measure the cross-sections for elastic scattering and nucleon transfer channels in the ^(6)Li+^(9)Be reaction at an incident energy of 68 MeV:^(9)Be(^(6)Li,^(6)Li)^(9)Be,^(9)Be(^(6)Li,7Li)8Be,^(9)Be(^(6)Li,7Li)^(8)Be_(2+),^(9)Be(^(6)Li,^(8)Li)^(7)Be,and ^(9)Be(^(6)Li,^(7)Be)^(8)*** objective of the study is to elucidate the manifestation of the cluster structure of ^(9)*** analysis of the contributions of the one-step and two-step neutron transfer mechanisms is performed using the distorted wave Born approximation method with the Fresco *** agreement between the calculations and the experimental data is obtained for the channels of elastic scattering ^(9)Be(^(6)Li,^(6)Li)^(9)Be,neutron ^(9)Be(^(6)Li,^(7)Li)^(8)Be,and proton transfer ^(9)Be(^(6)Li,^(7)Be)^(8)Li,as well as for the transfer of two neutrons ^(9)Be(^(6)Li,^(8)Li)^(7)*** dineutron cluster transfer mechanism makes a dominant contribution to the ^(9)Be(^(6)Li,^(8)Li)^(7)Be reaction channel at forward angles.

关键词： elastic scattering neutron and proton transfer reaction mechanisms DWBA Fresco code