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Recension of boron nitride phase diagram based on high-pressure and high-temperature experiments

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Chinese Physics B 2024年第10期33卷 450-457页

作者： Ruike Zhang Ruiang Guo Qian li Shuaiqi li Haidong Long Duanwei He institute of atomic and Molecular Physics Sichuan UniversityChengdu 610065China College of Physics and Electronic Engineering Chongqing Normal UniversityChongqing 401331China Key Laboratory of High energy Density Physics and Technology of Ministry of Education Sichuan UniversityChengdu 610065China

Cubic boron nitride and hexagonal boron nitride are the two predominant crystalline structures of boron *** can interconvert under varying pressure and temperature ***,this transformation requires overcoming significant potential barriers in dynamics,which poses great difficulty in determining the c-BN/h-BN phase *** study used high-pressure in situ differential thermal measurements to ascertain the temperature of h-BN/c-BN conversion within the commonly used pressure range(3.6 GPa)for the industrial synthesis of c-BN to constrain the P-T phase boundary of h-BN/c-BN in the pressure-temperature range as much as *** on the analysis of the experimental data,it is determined that the relationship between pressure and temperature conforms to the following equation:P=a+1/***,P denotes the pressure(GPa)and T is the temperature(K).The coefficients are a=-3.8±0.8 GPa and b=229.8±17.1 GPa/*** findings call into question existing high-pressure and high-temperature phase diagrams of boron nitride,which seem to overstate the phase boundary temperature between c-BN and *** BN phase diagram obtained from this study can provide critical temperature and pressure condition guidance for the industrial synthesis of c-BN,thus optimizing synthesis efficiency and product performance.

关键词： hexagonal boron nitride phase diagram high temperature and high pressure cubic boron nitride phase transition differential thermal analysis

Analysis of heavy-ion-induced DNA strand breaks in plasmid pUC18

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Analysis of heavy-ion-induced DNA strand breaks in plasmid p...

中国作物学会2007年全国作物遗传育种学术研讨会

作者： GUO Hui-jun~1 liU Lu-xiang~1 li Jia-cai~2 ZHAO Kui~3.SUI li~3.ZHAO lin-shu~1 ZHAO Shi-rong~1 1.The National Key Facility for Crop Gene Resources and Genetic Improvement,institute of Crop Science,Chinese Academy of Agricultural Sciences,Beijing 100081,china 2.institute of High energy Physics,Chinese Academy of Sciences,Beijing 100093.china 3.Department of Nuclear Physics,china institute of atomic energy,Beijing 102413,china

Plasmid DNA was irradiated or implanted by mixed particle field(CR)or lithium-ion-beam to detect strand *** primary results showed that mixed particle field could induce single and double strand breaks with positive linear-dose-effects;most of sequence changes induced by CR were point ***-ion-beam could induce strand breaks also,but it was only at dose of 20Gy.

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The Absolute Amplitude Problem in the Three-Nucleons Transfer Reaction Theory

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Chinese journal of nuclear physics 1997年第3期19卷 166-172页

作者： liu Xiaodong Sun Zuxun Yuan Jian Chen Quan Lu Ming Lu Daoru li Hui china {3. of atomic energy,P.O.Box 275(10),Beijing 102413 中国原子能科学院北京

The differential cross sections of 42Ca（p,α）3.K with 3.K in （3.2）+ and （1/2）+ states at Ep=20.0 MeV are measured and analyzed by using microscopic DWBA *** realpotential is calculated via density dependent realistic nuclear force in a double-folding procedurewhereas the imaginary potential is expressed in terms of Fourier-Bessel *** improvedcalculation is obtained and analyzed to understand the absolute amplitude problem.

关键词： (p,α)reaction Microscopic DWBA theory Absolute problem

EQUATION OF STATE CALCULATIONS FOR HOT, DENSE MATTER AT ARBITRARY DENSITIES AND TEMPERATURES

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Acta Mechanica Sinica 1989年第4期5卷 361-368页

作者： li Zhaoning Pan Shoufu institute of atomic and Molecular Physics, Jilin University 1. institute of atomic and Molecular Physics Jilin University Jilin China

Within the approximations of spherical lattice cell, central-field, and relativistic Fermi statis- tics, an algorithm with average atom model is presented to calculate the electronic energy levels and equation of state for hot and dense matter at arbitrary densities and temperatures. Choosing Zink's analytical potential as initial potential, we have solved the Dirac-Slater equation which satisfies the Weigner-Seitz boundary condition. The electronic energy bands are not taken into account. Tak- ing energy level degeneracy as a continuous function of density, we have considered the pressure ionization effects for highly dense matter. Results for ^(13.Al atom are shown.

关键词： average atom model equation of state Dirac-Slater equation pressure ionization effect.

Entropy of complex network and HUHPM approach

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Entropy of complex network and HUHPM approach

第三届全国复杂动态网络学术论坛

作者： Bi Qiao, Fang Jin-Qing, liu Qiang, and li Yong china {3. of atomic energy, P.O. Box 275-27, Beijing 102413, china.

＜正＞The general formulas of the network for the power exponents of the degree distribution and the entropy are presented based on an open liouville equation for the driven network. The proposed harmonious unifying hybrid preferential models （HUHPM） have been studied using the obtained formalism, in which the simulating results are quite consistent with the theoretical results.

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Monte Carlo method for evaluation of surface emission rate measurement uncertainty

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Nuclear Science and Techniques 2024年第7期35卷 126-136页

作者： Yuan-Qiao li Min lin li-Jun Xu Rui Luo Yu-He Zhang Qian-Xi Ni Yun-Tao liu china institute of atomic {3. Beijing102413China National Key Laboratory for Metrology and Calibration Techniques Beijing102413China Department of Radiation Oncology Hunan Cancer HospitalChangsha410031China The Affiliated Cancer Hospital of Xiangya School of Medicine Central South UniversityChangsha410031China

The aim of this study is to evaluate the uncertainty of 2πα and 2πβ surface emission rates using the windowless multiwire proportional counter *** study used the Monte Carlo method (MCM) to validate the conventional Guide to the Expression of Uncertainty in Measurement (GUM) method.A dead time measurement model for the two-source method was established based on the characteristics of a single-channel measurement system,and the voltage threshold correction factor measurement function was indirectly obtained by fitting the threshold correction *** uncertainty in the surface emission rate was calculated using the GUM method and the law of propagation of *** MCM provided clear definitions for each input quantity and its uncertainty distribution,and the simulation training was realized with a complete and complex mathematical *** results of the surface emission rate uncertainty evaluation for four radioactive plane sources using both methods showed the uncertainty’s consistency E_(n)lidation tool for GUM results.

关键词： Surface emission rate Monte Carlo method Metrology Probability distribution function Dead time Low-energy loss correction Least-squares method

Synchronization and Bifurcation Analysis in Discrete-time Complex Networks

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Synchronization and Bifurcation Analysis in Discrete-time Co...

第三届全国复杂动态网络学术论坛

作者： SUN Wei-Gang, CHEN Yan, li Chang-Pin and FANG Jin-Qing Department of Mathematics, Shanghai University, Shanghai, 200444, china china {3. of atomic energy, Beijing, 102413, china

＜正＞Synchronization and bifurcation analysis in discrete-time complex dynamical networks are investigated in the present paper. We mainly focus on some special coupling matrix, i.e., the sum of each row equals a nonzero constant u and the network configuration is directed. A result that the networks can reach a new synchronous state which is not the asymptotic limit set determined by the node equation is derived. It is interesting that the networks appear bifurcation if we regard the constant u as a bifurcation parameter at the synchronous state. Numerical simulations are given to show the efficiency of our derived conclusions.

关键词： complex dynamical networks synchronization bifurcation

Revealing the atomic mechanism of diamond–iron interfacial reaction

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Carbon energy 2024年第3期6卷 255-263页

作者： Yalun Ku Kun Xu Longbin Yan Kuikui Zhang Dongsheng Song Xing li Shunfang li Shaobo Cheng Chongxin Shan Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Material PhysicsMinistry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhouChina Department of Mechanical Engineering Stanford UniversityStanfordCaliforniaUSA Information Materials and Intelligent Sensing Laboratory of Anhui Province Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of EducationInstitutes of Physical Science and Information TechnologyAnhui UniversityHefeiChina institute of Quantum Materials and Physics Henan Academy of SciencesZhengzhouChina

Diamond,with ultrahigh hardness,high wear resistance,high thermal conductivity,and so forth,has attracted worldwide ***,researchers found emergent reactions at the interfaces between diamond and ferrous materials,which significantly affects the performance of diamond-based ***,combing experiments and theoretical calculations,taking diamond–iron(Fe)interface as a prototype,the counter-diffusion mechanism of Fe/carbon atoms has been ***,it is identified that Fe and diamond first form a coherent interface,and then Fe atoms diffuse into diamond and prefer the carbon vacancies ***,the relaxed carbon atoms diffuse into the Fe lattice,forming Fe_(3.***,graphite is observed at the Fe_(3.C surface when Fe_(3.C is over-saturated by carbon *** present findings are expected to offer new insights into the atomic mechanism for diamondferrous material's interfacial reactions,benefiting diamond-based device applications.

关键词： coherent interface counter-diffusion diamond iron phase transition

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密度计法测定重水浓度

同位素 1994年第1期7卷 43-46页

作者：郑彦巍李桂花中国原子能科学研究院

用ＤＭＡ－６０密度计测定重水浓度，测量范围是０％－１００％（ｍｏｌ／ｍｏｌ）Ｄ＿２Ｏ，相对标准偏差＜０．０２％Ｄ＿２Ｏ，不需用标准样品绘制工作曲线，直接进样即可求出样品浓度。

关键词：重水密度计浓度