bluuebunny/crossref_metadata_2025 huggingface dataset:
Energy Efficiency – Indoor Air Quality Dilemma in Educational Buildings
Authors:   , Asere Līva
Published: December 2020

The largest energy consumer in Europe is the building sector, which uses about 40 % of total energy consumption and generates around 36 % of total CO2 emissions in the EU [1], [2]. Rising trends in energy consumption can be observed globally due to the demand of citizens for increased comfort, wider use of electrical equipment as well as other reasons. As energy consumption increases, climate change is promoted. In a number of areas energy could be used more efficiently, minimizing its consumption and, thus, resulting in a reduction of greenhouse gas emissions. To achieve carbon neutrality in 2050 in Europe Union, ambitious targets have been set, such as improving energy efficiency by 41 %, using 100 % of renewable energy sources and reducing greenhouse gas emissions of 80 % to 100 % [1], [3], [4]. Energy efficient buildings help to reduce heat consumption. State and local authorities need to set an example by improving the energy efficiency of their own buildings in order to encourage changes in other buildings as well. Moreover, the introduction of energy efficiency measures in buildings owned by the public sector contributes to the objectives of national climate policy. However, increasing energy efficiency has resulted in buildings becoming more airtight and natural ventilation systems need to be replaced by mechanical ventilation. However, this, in turn, leads to additional energy consumption costs. To avoid cost increases, building managers do not operate or operate unsatisfactory ventilation systems creating unfavourable indoor air quality. This creates a dilemma of energy efficiency and indoor air quality, which reduces performance of building occupants. This dilemma reduces pupils’ performance in educational buildings, reducing their chances of obtaining a good education and in the future working with higher added value which in turn reduces the country’s gross domestic product. The objective of the Thesis is to perform an assessment on energy efficiency – indoor air quality dilemma in educational buildings, its impact analyses on national prosperity, and to propose a solution to the prevention of the dilemma. The Thesis is based on six thematic joint scientific publications. The thesis consists of an introduction and three chapters. Four hypotheses have been formulated in the work that are further studied by various research methods, including system dynamic modelling, measurements in real sites and cost-benefit analysis. The thesis begins with an introduction continuing with a literature review of the topics. Chapter 2 presents the study methods. Chapter 3 examines the results obtained during the study and at the end of the Thesis, the findings are summarised according to the hypotheses.
La estandarización ortográfica del quichua ecuatoriano. Consideraciones históricas, dialectológicas y sociolingüísticas
Authors: Montaluisa Chasiquiza Luis
Published: December 2020

Este libro arranca con un estudio de términos, principalmente topónimos, de las lenguas pasto, cara, panzaleo, puruhá, cañar, y palta que son sustratos de la lengua quichua. Propone la discusión acerca de las teorías sobre el origen de la familia quechua/quichua. Muestra el mosaico de las variaciones dialectales actuales, a nivel fonético-fonológico y morfológico, en tanto que en los niveles sintáctico y semántico las diferentes hablas son más regulares.
EXPERIMENTAL DETERMINATION FOR 4HeH+ INTERNUCLEAR SEPARATION
Authors: MIAO JING-WEI  , SHI MIAN-GONG  , YANG BAI-FANG  , TANG A-YOU  , N.CUE  ,   四川大学原子核科学技术研究所，成都  610064
Published: December 2020

Through the Coulormb-Explosion of MeV ion microcluster in self-supported superthin carbon foil, the determined value of 4HeH+ internuclear separation, generated by rf ion source,is obtained to be 0.094±0.003nm. It is found that 4HeH+ is different from H+2 and H+3, and their internuclear separations are closely related to the species and parameters of ion source. By means of the mechanism and condition of 4HeH+ formation, the difference of internuclear sepapation for 4HeH+ produced in the rf and deuplasmatron ion source was discussed.
ELECTRIC FIELD INDUCED ANTIFERROELECTRIC TO FERROELECTRIC PHASE TRANSITION OF Pb (Zr,Sn,Ti)O3 CERAMICS AND TAILORING OF PROPERTIES THROUGH COMPOSITION MODIFICATION
Authors: LIU PENG  , YANG TONG-QING  , XU ZHUO  , ZHANG LIANG-YING  , YAO XI  ,   (1)陕西师范大学物理系，西安  710062; (2)同济大学功能材料研究所，上海  200092; (3)西安交通大学电子材料研究所，西安  710049
Published: December 2020

In order to obtain a new kind of antiferroelectric (AFEt) ceramics wi th lower AFEt-Ferroelectric (FER) switching field Ef and less hysterisis loss ΔE for application of large displacement actuato r, Ba2+ ionics was employed to control the relative stability between AFEt, FER, and parroelelctrics (PEc) phases in (Pb097-xBaxLa002)(Zr055Sn035Ti01)O3 (0≤x≤02) system. Structural chan ges and electric properties as a function of Barium content x have been investig ated by X-Ray diffraction, dielectric properties, polarization and longitudinal strain measurement. It is observed that AFEt changes to FER, and finally to ferroelectric relaxors(RFE) as Ba content x increases from zer o to 02. Based upon these expermental result, we are able to tailor the AFE-FE switching parameters such as Ef, ΔE and AFEt operating t emperature range ΔT through modifying the Ti/Sn ratio near AFEt/FER phase boundary in the (Pb087Ba01La00 2)(Zr06TiySn04-y)O3 (004 ≤y≤009) system. Finally, a new kind of AFEt ceramics with Ef =16kV/mm，ΔE=085kK/mm， and longitudinal strain x=01%—02% which is appropriate for application of digital actuators has been obtained. Phase dia gram with composition located near AFEt/FER boundary of t he studied system has been determined.
IMAGING STUDY OF FLAT-FIELD GRATINGS FOR NON-POINT LIGHT SOURCE
Authors: LI YING-JUN  , YANG JIAN-LUN  , ZHANG JIE  ,   (1)中国工程物理研究院核物理与化学研究所，成都  610003; (2)中国科学院物理研究所，北京  100080
Published: December 2020

Using a ray-tracing code,the imaging process of non-point light sources through a concave grating has been studied.It is demonstrated that under specially designed conditions,a plane spectrum can be formed for non-point light sources.The positions for the plane spectrum have been derived for the sources at different distance from the grating.A criterion has been defined under which the effects of variation of the source-size on the focal plane can be neglected.
A SIGNATURE FOR THE FORMATION OF THE QUARK-GLUON PLASMA IN RELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS
Authors: HE  ZE-JUN  , JIANG WEI-YUAN  , ZHU ZHI-YUAN  , LIU BO  ,   (1)兰州重离子加速器国家实验室理论核物理中心，兰州  730000；中国科学院上海原子核研究所，上海  201800; (2)中国科学院高能物理研究所，北京  100039
Published: December 2020

From thermodynamic relations, the initial values of the quark-gloun plasma from relativistic nucleus-nucleus collisions are obtained. From these initial values we have studied the dilepton production on the basis of the (3+1) dimensional relativistic hydrodynamic model established by the present authors, and found that with increasing incident energy a characteristic plateau indicating the formation of quark-gluon plasma appears in the total yield, which may be tested in future experiments in CERN and Brookhaven.
STUDY ON THE PEIERLS PHASE TRANSITION OF ARMCHAIR CARBON NANOTUBE
Authors: ZHANG HONG-QUN  ,   北京师范大学物理系，北京  100875
Published: December 2020

Using a Frhlich Hamiltonian for the electron-lattice interaction, an expression for the Peierls phase transition temperature (Tp) of armchair carbon nanotube (ABT(n)) has been derived.As an illustration, the formula is used to estimate Tp of ABT(8) and ABT(10). The results indicate that Tp of ABT(n) will decrease with increasing of their diameters,and they are stable against the Peierls distortion and preserve metallic property at and far bellow room temperature.
THE GAIN COMPUTATION FOR THE TRAVELING WAVE TUBE WITH RIDGE-LOADED HELICAL GROOVE
Authors: WEI YAN-YU  , WANG WEN-XIANG  , GONG YU-BIN  , ZHOU PENG  ,   电子科技大学高能电子学研究所，大功率微波国家重点实验室，成都  610054
Published: December 2020

The ridge-loaded helical traveling wave tube (TWT) is a new kind of high power millimeter wave device. The “hot” dispersion equation of this circuit loaded with an electronic beam is presented in this paper, and the Downhill method is used to solve the transcendental equation. The physical dimensions of a 474GHz ridge-loaded helical groove slow wave structure (SWS) with a 20kV electron beam are given and the investigations of the effect of the ridge dimensions and electron beam parameters on the small signal gain are carried out. It is indicated from the calculation results that this type of structure is suitable for use as s SWS of high power, high gain but narrow passband millimeter TWT, of which the 3dB gain bandwidth is 34%. In order to increase the bandwidth, the reduction of the ridge gap or the increase of the electron beam current in an allowable range may be useful. The presented analysis will be a guide to the design of this kind of traveling wave tube.
QUANTUM FLUCTUATIONS OF CHARGE AND CURRENT IN MESOSCOPIC RLC CIRCUIT IN SQUEEZED VACUUM STATE
Authors: GU YONG-JIAN  ,   昌潍师专物理系，山东潍坊  261043
Published: December 2020

A method of quantizing an active RLC circuit is developed, and the quantum fluctuations of the charge and current in the mesoscopic RLC circuit in the squeezed vacuum state, especially the influences of the resistance and the squeezing parameters on the quantum fluctuations are investigated.
APPROACHES TO IMPROVE THE CALCULATING CONVERGENCE OF GRATING DIFFRACTION
Authors: ZHOU CHUAN-HONG  , WANG LEI  , WANG ZHI-HENG  ,   四川大学物理系,成都610064
Published: December 2020

From three respects such as mathematical principle,geometric stratification and numerical calculation,we have studied the convergence of rigorous coupled-wave approach (RCWA) in solving the grating diffraction problems.The approaches which can be applied to improve the convergence of RCWA are proposed.It is found that,for different cases of grating,the major factors affecting the convergence of RCWA are different.Therefore,the improving methods should be practically chosen for concrete case of grating.
PROPAGATION PROPERTIES OF MAGNETIC SURFACE WAVES ON THE INTERFACE BETWEEN TWO NONLINEAR ANTIFERROMAGNETS
Authors: WU ZHONG  , WANG QI  ,   上海大学物理系,上海200436
Published: December 2020

The nonlinear behavior of surface waves on the interface between two uni-axis antiferromagnets is studied.The theoretical analysis and the numerical simulation show that there exist two thresholds:frequency threshold and power threshold.All the incident waves satisfying the two thresholds can steadily propagate in this new guiding structure.It is indicated that the peak field will jump from one antiferromagnet into another when the power increases. It is also revealed that the magnetic field amplitude on the interface is not power-dependent but frequency-dependent.
STUDY ON THE THERMOPOWER AND RESISTIVITY OF A NEW SUPERCONDUCTOR MgB2
Authors: YANG HONG-SHUN  , YU MIN  , LI SHI-YAN  , LI PENG-CHENG  , CHAI YI SHENG  , ZHANG LIANG  , CHEN XIAN-HUI  , CAO LIE-ZHAO  ,   中国科学技术大学结构分析实验室物理系,合肥230026
Published: December 2020

The temperature-dependent thermopower and resistivity of MgB2 were measured.In the range of 100—300K, the thermopower presents positive nearly linear temperature dependence,indicating that the charge carrier is hole and it is consistent with the energy band pattern.In contrast,the resistivity follows T2 relationship in the same temperature range.Below 100K,thermopower and resistivity change their temperature dependence.The thermopower presents a hump between the superconducting transition temperature Tc (zero resistance,36.6K) and 100K.It has the characteristic of the phonon drag,indicating the strong electron-phonon interaction.Some important parameters are estimated according to experimental results,such as Fermi energy EF and energy band width.
SIMULTANEOUS OSCILLATION OF RESONANCE-METASTABLE TRANSITION LASER IN CALCIUM ATOMS AND IONS
Authors: PAN BAI-LIANG  , CHEN GANG  , YAO ZHI-XIN  , FANG BEN-MIN  ,   浙江大学物理系,杭州310027
Published: December 2020

Simultaneous oscillation of resonance-metastable transition laser in calcium atoms and ions was obtained in a discharge tube with 1.3cm inner diameter and 46cm electrode separation through longitudinal high frequency pulse discharge.The maximum laser output power and laser efficiency reach 1.1W and 0.1 percent respectively.Laser output characteristics depend on various working parameters and the ratio of Pi/Pa were measured and analyzed.
EXPERIMENTAL STUDY ON THE MECHANISM OF A SELF-STARTING KERR-LENS-MODE-LOCKING USING A SEMICONDUCTOR SATURABLE ABSORBER MIRROR
Authors: CHAI LU  , WANG QING-YUE  , ZHAO JIANG-SHAN  , XING QI-RONG  , ZHANG ZHI-GANG  ,   天津大学精密仪器与光电子工程学院超快激光研究室,国家教育部光电子信息技术科学重点实验室,天津300072
Published: December 2020

The self-starting dynamics of the Kerr-lens-mode-locking (KLM) in a Ti:sapphire laser using an intracavity broadband semiconductor saturable absorber mirror (SESAM) was investigated experimentally.The mechanism of the self-starting KLM using a SESAM was investigated and discussed.
SIMULATION OF ACOUSTIC WAVE PROPAGATION IN COMPLEX MEDIA USING MRFD METHOD
Authors: MA JIAN-WEI  , YANG HUI-ZHU  , ZHU YA-PING  ,   (1)The Center of Wave Phenomenon,Department of Geophysics,Colorado School of Mines,Colorado 80401,USA; (2)清华大学工程力学系,地震波勘探研究所,北京100084
Published: December 2020

This paper is devoted to the simulation of acoustic wave propagation in complex media, applying the finite difference scheme and the orthonormal compactly supported wavelet transform approximation,to the time and the space dimension of the wave equation, respectively. A new method, which is a fast adaptive arithmetic, named Multiresolution Finite Difference (MRFD) is first proposed to solve the problem of the wave propagation in multi-layered medium with nonperiodic boundary condition. Thus the problem is solved in the wavelet domain rather than in the traditional Euclidian space. Due to adaptive and vanishing-moment property of the wavelet basis, the difference operator and solution vector have sparseness in the wavelet domain. MRFD is a promising method because of some advantages such as lighter computational burden, efficiency of convergence and robustness. Numerical results in geophysics exploration show the effectiveness and potential of the method.
ON THE LINE SHAPE OF VELOCITY MODULATION LASER SPECTROSCOPY
Authors: GAO HUI  , LIU YU-YAN  , LIN JIE-LI  , SHI JIN  , XIONG GUI-GUANG  , ZHANG ZHE-HUA  , TIAN DE-CHENG  ,   (1)波谱与原子分子物理国家重点实验室,中国科学院武汉物理与数学研究所,武汉430071; (2)武汉大学物理系,武汉430072; (3)武汉大学物理系,武汉430072;波谱与原子分子物理国家重点实验室,中国科学院武汉物理与数学研究所,武汉430071; (4)中国科学院武汉物理与数学研究所,武汉430071;波谱与原子分子物理国家重点实验室,华东师范大学物理系,上海200063
Published: December 2020

The effect of pressure broadening on the line shape of velocity modulation laser spectroscopy is considered here, which is induced by the collisions of the gas molecules. The old theory on velocity modulation spectroscopy is revised and new theory is setup to get the precise simulation of our experimental spectrum. It has been shown that the new theory agrees with experiments perfectly, and has potential applications in the investigation of the dynamics of the collisions of molecular ions and obtaining more precisely resolved spectrum.
QUADRATURE PHASE-SQUEEZING OF PUMP FIELD REFLECTED FROM TRIPLY RESONANT QUASI-PHASE-MATCHED OPTICAL PARAMETRIC OSCILLATOR
Authors: LI YONG-MIN  , FAN QIAO-YUN  , ZHANG KUAN-SHOU  , XIE CHANG-DE  , PENG KUN-CHI  ,   山西大学光电研究所,山西大学量子光学教育部重点实验室,太原030006
Published: December 2020

A quasi- phase-matched optical parametric oscillator(QPM OPO)consisting of a periodically poled LiNbO3(PPLN) crystal is pumped by an all-solid state single frequency Nd:YVO4 laser. The triple resonance of the pump mode and two subharmonic modes with near- degenerate frequencies are experimentally demonstrated by means of precision temperature control of the crystal. The threshold pump power is only 1.2mW. The quadrature phase noise squeezing of the pump field reflected from the OPO up to 1.1dB is observed at the pump power of 2.8 times of the oscillation threshold. The numerically calculated result is in good agreement with the experimentally measured data.
CAVITY FIELD SPECTRA OF AN ATOM INTERACTING WITH TWO-MODE FIELD THROUGH RAMAN PROCESS
Authors: GAO YUN-FENG  , FENG JIAN  , SHI SHU-REN  ,   (1)聊城师范学院教育工程系,聊城252059; (2)中国科学院安徽光学精密机械研究所激光光谱学开放实验室,合肥230031;聊城师范学院光通信研究所,聊城252059
Published: December 2020

The cavity field spectra of a two level atom interacting with two mode field through Raman process are investigated. It is shown that the basic features of the spectra is unchanged whether the atom is in the high or low level state initially. Symmetrical two peak structure appears in the spectrum for each mode when the initial fields are both in the pure number states or both in the coherent states. The split of the two peaks is proportional to the field intensity of the other mode.
SELF-CONSISTENT DESCRIPTION OF A DC HOLLOW CATHODE DISCHARGE AND ANALYSIS OF CATHODE SPUTTERING
Authors: LAI JIAN-JUN  , YU JIAN-HUA  , HUANG JIAN-JUN  , WANG XIN-BING  , QIU JUN-LIN  ,   (1)华中科技大学激光技术国家重点实验室,武汉430074; (2)华中科技大学激光技术国家重点实验室,武汉430074;深圳大学光电子系与华中科技大学激光技术国家重点实验室联合培养的博士研究生; (3)深圳大学科技研究院光电子系,深圳518060; (4)深圳大学理学院,深圳518060
Published: December 2020

The characteristics of DC hollow cathode discharge and cathode sputtering was investigated by means of a two dimensional hybrid model, combing Monte Carlo simulation of the motion of fast electrons and a fluid description of slow electrons and positive ions. The results demonstrate the existence of the hollow cathode effect in the discharge and show that the spatial shape of the normalized ionization source is dependent more on the gas pressure than on the discharge voltage. The factors related to the cathode sputtering were analyzed. Investigations have demonstrated that the non uniform sputtering on the cathode surfaces in a sputter-type ion laser is due to the non-uniform distribution of electric field, flux and density of ions bombarding the cathodes.
FORMATION AND STRUCTURE OF 3∶29-TYPE GdGd3(Fe1-xCox)29-yCry COMPOUNDS
Authors: WANG WEN-QUAN  , WANG JIAN-LI  , TANG NING  , BAO FU-QUAN  , WU GUANG-HENG  , YANG FU-MING  , JIN HAN-MIN  ,   (1)吉林大学物理系,长春130023; (2)中国科学院物理研究所磁学国家重点实验室,北京100080; (3)中国科学院物理研究所磁学国家重点实验室,北京100080;吉林大学物理系,长春130023
Published: December 2020

Based on a study of the phase relation in the Fe- and Co-rich region of the equi-gadolinium content section with the Gd content corresponding to the chemical formula Gd3(Fe,Co,Cr)29 in the Gd-Fe-Co-Cr quaternary system, formation, structure and magnetic properties of the 3∶29-type Gd3(Fe1-xCox)29-yCry compounds have been investigated. It has been found that the composition range of formation of the single phase Gd3(Fe1-xCox)29-yCry Compounds is 0≤x≤0.7 for y=5.0, 0.7≤x≤0.8 for y=5.5, and 0.8≤x≤1.0 for y=6.0. A pure Co-based Gd3Co29-xCrx compound series have been synthesized. The solubility limit of the Cr atoms in the Gd3Co29-xCrx compounds was found to be from x=6.5 to x=7.3. The results indicate that all the synthesized Gd3(Fe1-xCox)29-yCry compounds crystallize in Nd3(Fe,Ti)29 type structure of the monoclinic system and the space group A2/m.The solubility limit of Co atoms in the Gd3(Fe1-xCox)29-yCry compounds increases with increasing the stabilizing element Cr. It is noteworthy that substitution of Co for Fe leads to a remarkable change of the magnetocrystalline anisotropy of the Gd3(Fe1-xCox)29-yCry compounds. When x≥0.4 the anisotropy changes from the easy plane type to the uniaxial type, which is important for permanent magnet application.
STUDY ON HIGH ELECTRIC FIELD ANNEALING EFFECT IN THIN GATE OXIDE OF MOS STRUCTURE
Authors: ZHANG JIN-CHENG  , HAO YUE  , ZHU ZHI-WEI  ,   西安电子科技大学微电子研究所,西安710071
Published: December 2020

High electric field annealing effect in thin gate oxide of MOS structure is studied in depth, and the detrapping mechanisms of trapped charge in the gate oxide are investigated. Comparison between the growth mechanism and the detrapping mechanism of trapped charge in gate oxide is made by experiments and simulations. A satisfactory physical description is presented for explaining this effect. Comparison between annealing under negative and positive gate voltages shows that the former is more effective .
STUDY ON MAGNETIC PROPERTIES OF Fe-NANOWIRES BY MICROMAGNETIC SIMULATION
Authors: XIAO JUN-JUN  , SUN CHAO  , XUE DE-SHENG  , LI FA-SHEN  ,   兰州大学教育部磁学与磁性材料重点实验室,兰州730000
Published: December 2020

Systematic study on magnetic properties of Fe-nanowires fabricated by electrochemical deposition is performed by micromagnetic simulation,which reveals that all nanowires show magnetic anisotropy,and the coercivity dependents on the diameter with a relationship of inverse square ratio.With fixed diameter,it increases as the length increases,stopping at a platform.The hysteresiss loop,static magnetic configuration and reversal mechanism all vary with changing diameter and length of the wires.Explicit explanation is presented based on the details of the magnetization process.Nanowires with diameter of 5nm,which have not been successfully acquired by experiments all show uniform reverse mechanism in the simulation.Even more intriguing magnetic behaviors emerge when the shape of the wires becomes more particle-like.
THE MAGNETORESISTIVE EFFECT OF p-TYPE SEMICONDUCTING DIAMOND FILMS
Authors: KONG GHUN-YANG  , WANG WAN-LU  , LIAO KE-JUN  , MA YONG  , WANG SHU-XIA  , FANG LIANG  ,   (1)重庆大学理学院应用物理系,重庆400044; (2)重庆大学理学院应用物理系,重庆400044;重庆师范学院物理系,重庆400047; (3)重庆师范学院物理系,重庆400047
Published: December 2020

The heteroepitaxial diamond films were grown on the p-type Si (100) substrate by microwave plasma chemical vapor deposition (CVD). The diamond films were patterned to strip types with the oxygen plasma etching technology. The magnetoresistance measurements have been carried out in a magnetic field ranging from 0 to 5 T, using the four-probe method. It was shown that the heteroepitaxial diamond films may produce fairly big magnetoresistance. Based on the Fuchs and Sondheimer thin film theory, mixed scattering by lattice vibration,ionized impurities and surfaces is considered. Taking the parallel connection resistance model, a theoretical description of the magnetoresistive effect in heteroepitaxial diamond films is presented by solving the Boltzmann transport equation in the relaxation time approximation. A relationship between the magnetoresistance and the film thickness, magnetic field, mobility and hole density is developed. The influence of valence deformation and surface scattering to the magnetoresistance of heteroepitaxial diamond films is discussed. A possible cause is proposed to explain the fairly big magnetoresistance of the films.
INFLUENCE OF Gd3+ AND Y3+-DOPING ON LOW TEMPERATURE THERMOLUMINESCENCE OF Pb WO_4
Authors: LIU BO  , SHI CHAO-SHU  , ZHOU DONG-FANG  , QI ZE-MING  , HU GUAN-QIN  , TANG HONG-GAO  ,   (1)中国科学技术大学国家同步辐射实验室,合肥230029; (2)中国科学技术大学结构分析开放实验室,合肥230026;中国科学技术大学国家同步辐射实验室,合肥230029; (3)中国科学技术大学结构分析开放实验室,合肥230026;中国科学技术大学国家同步辐射实验室,合肥230029;中国科学技术大学物理系,合肥230026; (4)中国科学技术大学物理系,合肥230026; (5)中国科学院上海硅酸盐研究所,上海201800
Published: December 2020

The influence of Gd3+ and Y3+ doping on the low temperature thermoluminescence (TL) of PbWO4(PWO) is investigated. In the case of polycrystal powder, the TL above 180K is eliminated by doping Y3+ or Gd3+ ions. Meanwhile, a new TL peak at lower temperature appeare. For the PWO single crystal there are two TL peaks at about 130 and 253K, but only one single peak at about 130K for PWO:Y crystals. The common effect of doping trivalent ions is to decrease or eliminate the TL above 180K and create a new TL peak at lower temperature. It indicates that the traps responsible for TL above 180K are due to the intrinsic defects which probably are Pb3+ and O-. During the preparation of PWO, the evaporation of the PbO component is easier than that of WO3, which will lead to the deficiency of PbO. The deficiency of O ions can be compensated by annealing in air while the deficiency of Pb is permanent. Therefore in the volume surrounding the Pb vacancy, there is a lack of positive charge. So the charge deficiency in the Pb-sublattic can be most easily balanced by an increase of concentration of Pb3+ and O- Doping Gd3+ or Y3+ can decrease the concentration of Pb3+ and O-. Gd3+ or Y3+ can also play a role of electron traps, which create new TL peaks at 150 and 125K, respectively. The trap depth of Gd3+ and Y3+ are 0.32 and 0.29eV, respectively. The difference between doping Gd3+ and Y3+ can be explained by the difference between their coulomb potentials.
OPTICAL NONLINEARITIES IN TWO NOVEL NANOCOMPOSITES BASED ON FULLERENE C60 STRUCTURED SYSTEM WITH GOLD NANOPARTICLES
Authors: QU SHI-LIANG  , SONG YING-LIN  , DU CHI-MIN  , WANG YU-XIAO  , GAO YA-CHEN  , LIU SHU-TIAN  , LI YU-LIANG  , ZHU DAO-BEN  ,   (1)哈尔滨工业大学应用物理系,哈尔滨15000; (2)辽宁师范大学物理系,大连116029; (3)中国科学院化学研究所,北京100080
Published: December 2020

Two novel nanocomposites based on fullerene C60 structured systems with gold nanoparticles were investigated with 532nm, 8ns duration laser pulses. The comparison between Z-scan experimental results and theoretical analysis indicates that the nonlinear absorption primarily depends on the ligands, and the nonlinear refraction comes mainly from the contribution of gold nanoparticles in the materials. The comparison of the two nanocomposites with the well known C60 toluene solution in optical limiting properties was performed. The optical limiting mechanisms were discussed
SELF-GENERATED MAGNETIC FIELD BY HIGH FREQUENCY MODULATIONAL FIELD IN PLASMA
Authors: MA SHAN-JUN  ,   江西师范大学物理与通信电子学院,南昌330027
Published: December 2020

Magnetic field generated in plasma with high frequency modulational field has been studied in detail.By solving the two time-scale and two fluid equations,a set of nonlinear equations has been obtained by which the behavior of self-generated magnetic field can be described. Numerical results show that magnetic field self-generated by high frequency modulational field can be produced and with increase of time this magnetic field may collapse,leading to great enhancement of the magnetic field.
DYNAMICS OF INTERACTION OF ULTRASHORT LASER PULSES WITH SOLID TARGETS
Authors: CANG YU  , WANG WEI  , ZHANG JIE  ,   (1)中国科学院物理研究所光物理实验室,北京100080; (2)中国科学院物理研究所光物理实验室,北京100080;首都师范大学物理系,北京100037
Published: December 2020

Using Saha equation, a simple model is proposed for the dynamics of interaction between ultrashort laser pulses and solid targets. An adiabatic expansion model is adopted to study the expansion phase after the heating phase. Temporal evolvement of the dynamics of the interaction is obtained, from which the electron temperature, density, ionization balances can be determined.
EXTRACTION OF POLARIZATION-INDUCED CHARGE DENSITY INMODULATION-DOPED AlxGa1-xN/GaN HETEROSTRUCTURETHROUGH THE SIMULATION OF THE SCHOTTKY CAPACITANCE-VOLTAGE CHARACTERISTICS
Authors: ZHOU YU-GANG  , SHEN BO  , LIU JIE  , ZHOU HUI-MEI  , YU HUI-QIANG  , ZHANG RONG  , SHI YI  , ZHENG YOU-DOU  ,   南京大学物理系,南京210093
Published: December 2020

Polarization-induced charge density in modulation-doped AlxGa1-xN/GaN heterostructures is extracted through the simulation of the Schottky Capacitance-Voltage (C-V) characteristics. C-V measurements were made on Pt Schottky contacts on modulation-doped Al0.22Ga0.78N/GaN heterostructures. The C-V characteristics were simulated numerically using the three-dimensional Fermi model.Influence of sample parameters on C-V characteristics is analized by the simulation.Polarization-induced charge density,n-AlGaN doping level and Schottky barrier height have different influences on the C-V characteristics,and thus the polarization-induced charge density can be extracted accurately.The polarization-induced sheet charge density at the heterointerface is extracted to be 6.78×1012cm-2 in the Al0.22Ga0.78N/GaN heterostructure with the Al0.22Ga0.78 N thickness of 45nm.This work provides a method for quantitative analysis of the polarization-indeced charge in modulation-doped AlxGa1-xN/GaN heterostructures.
EFFECTS OF INTERFACE ROUGHNESS AND SPIN-FLIP ON TUNNELSPECTRUM IN FERROMAGNET-d-WAVE SUPERCONDUCTOR JUNCTIONS
Authors: DONG ZHENG-CHAO  ,   淮阴师范学院物理系,淮阴223001;南京大学物理系,固体微结构物理国家重点实验室,南京210093
Published: December 2020

Taking into account the spin-polarized effect,rough interface scattering and spin-flip effects,we calculate,within Blonder-Tinkham-Klapwijk Scattering formalism,the spin-polarized tunnel spectrum in the ferromagnet-d-wave superconductor junctions.It is shown that,(1) the conductance exhibits a sharp peak at zero-bias with the increase in spin-flip scattering;(2) the interface roughness can induce a small central peak in the zero-bias conductance dip and decrease the height of the zero-bias conductance peak.The calculated results can account for the tunnel spectrum observed experimentally in La2/3Ba1/3 MnO3/DyBa2Cu3O7 and La2/3 Ba1/3 MnO3/YBa2Cu3O7-δ junctions.
HIGH PRESSURE SYNTHESIS OF Ca DOPED (RPr)-123 SUPERCONDUCTORS
Authors: XIONG HAN  , CHE GUANG-CAN  , YAO YU-SHU  , NI YONG-MING  , DONG CHENG  , JIA SHUN-LIAN  ,   中国科学院物理研究所超导国家重点实验室,北京100080
Published: December 2020

The nearly single phase (R0.4Pr0.6)0.5Ca0.5Ba2Cu3O7-δ superconductors (R=La, Pr, Nd, Sm, Eu, Gd, Y) were prepared under high temperature and high pressure using the cubic anvil apparatus. The measured result shows that we can get superconductivity in all these Ca doping compounds with Tc above 100K.
HYDROSTATIC PRESSURE AND TEMPERATURE INDUCEDPHASE TRANSITION AND DIELECTRIC PROPERTIES OF La-DOPED Pb(Zr,Sn,Ti)O3 ANTIFERROELECTRIC CERAMICS
Authors: XU ZHUO  , FENG YU-JUN  , ZHENG SHU-GUANG  , JIN AN  , WANG FANG-LIN  , YAO XI  ,   西安交通大学电子材料与器件研究所,电子陶瓷与器件教育部重点实验室,西安710049
Published: December 2020

Hydrostatic pressure and temperature induced phase transition and dielectric properties of La-doped Pb(Zr,Sn,Ti)O3 antiferroelectric ceramics were studied. The effects of temperature on the pressure-induced phase transition and the dielectric property dependence on pressure have been investigated.It was found that rise of temperature makes the ferroelectric-antiferroelectric phase transition pressure decrease.And it was observed that hydrostatic pressure makes the ferroelectric-antiferroelectric phase transition temperature decrease and the antiferroelectric-paraelectric phase transition temperature increase.The results are of help in understanding the behaviors of pressure-induced dielectric frequency dispersion and diffuse phase transition exising in the antiferroelectric ceramics with composition and polar nanodomain fluctuations.
THE EXPERIMENTAL STUDY OF IMPROVING RARE-EARTHDOPED MATERIALS'S ENERGY UP-CONVERSIONEFFICIENCY
Authors: LIU ZHEN-WEI  , YANG XIAO-LIANG  , XIAO SI-GUO  ,   湘潭大学物理系,湘潭411105
Published: December 2020

Some conditions are put forward about improving the up-conversion efficiency through study of oxy-fluoride glasses based on TeO2,GeO2,ZnF2,SiO2 and PbF2. Hosts with low phonon energy benefit the energy up-conversion.It is also found that when the value of the quasi-field parameter of the oxy-fluoride host is adjusted near to that of the M parameter of the doped rare-earth, the materials show high up-conversion efficiency.Selecting suitable excitation photon energy to match the level of rare-earth ions and/or sensibilizer ions is a necessary condition for high up-conversion efficiency.The results provide some practical guidance to prepare rare-earth doped energy up-conversion materials.
A STUDY OF FIELD EMISSION OF SINGLE-WALLED CARBONNANOTUBES USING FIELD EMISSION MICROSCOPY
Authors: SUN JIAN-PING  , ZHANG ZHAO-XIANG  , HOU SHI-MIN  , ZHAO XING-YU  , SHI ZU-JIN  , GU ZHEN-NAN  , LIU WEI-MIN  , XUE ZENG-QUAN  ,   (1)北京大学电子学系,北京100871; (2)北京大学化学与分子工程学院,北京100871
Published: December 2020

Using Field Emission Microscopy (FEM), the electron field emission from a bundle of single-walled carbon nanotubes (SWCNT's) was studied under vacuum better than 4.0×10-7Pa after being thermo-desorbed at different temperatures.Work function of the SWCNT's decreases as the temperature of desorption goes up.After heat treatment at 1000℃, the SWCNT's exhibits the lowest work function and their electron field emission pattern also shows a fine structure.As the temperature for thermo-desorption is raised further, the SWCNT's field emission power deteriorates and finally collapse of SWCNT's occurs.
SHORT-TIME DYNAMICS OF TWO-COMPONENTCOLLOIDAL SUSPENSIONS
Authors: ZHANG HAI-YAN  , GERHARD M?GELE  , MA HONG-RU  ,   上海交通大学理论物理研究所,上海200030
Published: December 2020

We calculate the short-time translational and rotational self-diffusion coefficients for charge-stabilized binary colloidal suspensions where the density of one component is very dilute.The two-body and leading three-body contributions of hydrodynamic interaction (HI) to the diffusion tensor are taken into account.Due to both electrostatic interactions and HI, the self-diffusion coefficients depend on effective charge numbers,volumn fractions and sizes of two kinds of spheres, and the results can be explained by the effective hard sphere model.The influence of HI on charge-stabilized binary systems is less than that on hard-sphere binary systems.
THE c-AXIS MAGNETORESISTANCE STUDY IN THE NORMAL-STATE Sr2RuO4
Authors: GUO ZHONG-CHENG  , ZHENG PING  , WANG NAN-LIN  , CHEN ZHAO-JIA  , Y. MAENO  , Z. Q. MAO  ,   (1)Department of Physics,Kyoto University,Kyoto 606-8502,Japan; (2)中国科学院物理研究所极端条件物理开放实验室,北京100080; (3)中国科学院物理研究所极端条件物理开放实验室,北京100080;重庆大学理学院凝聚态物理实验室,重庆400044
Published: December 2020

We studied the c-axis magnetoresistance (H∥ab,J⊥c) of a typical layered perovskite superconducting single crystals Sr2RuO4.It is shown that the magnetoresistance is anisotropic and strongly temperature dependent.When rotating the direction of magnetic field in the ab-plane, the magnetoresistance varies periodically, and the maximum appears as the applied magnetic field is in the (110) direction.We analyze this transport property with respect to the Fermi surface anisotropy,the quasiparticle scattering rate anisotropy and the band dispersion anisotropy, respectively.
A NOVEL ALL-OPTICAL SWITCH BASED ON THE CASCADING OF SECOND-ORDER NONLINEARITY
Authors: LIU XUE-MING  , ZHANG MING-DE  , SUN XIAO-HAN  , LIU LIN  ,   东南大学电子工程系,南京,210096
Published: December 2020

By employing the concept of photon flux,the evolution of the phase and photon flux in the eigenmode state in three-wave mixing,and the requirements for the initial phase and photon flux in this state,are studied in the paper.A special state in which there are only exchanges of the photon flux but no phase variations in the three-wave mixing process is investigated.An all-optical switch based on the eigenmode pushpull nonlinear-optical-mirror is presented,and the properties of this all-optical switch are numerically calculated.The numerical results show that the performance stability is extremely good,and the intensity and phase of the output signal beams can be easily realized and controlled.
TEMPERATURE DEPENDENCE OF RAMAN SCATTERING IN K3Ba3C60
Authors: XIONG YI-MIN  , SUN ZHE  , CHEN XIAN-HUI  ,   中国科学技术大学结构分析开放实验室和物理系,合肥230026
Published: December 2020

Raman spectra at different temperatures are reported for K3Ba3C60.A systematic change of the Raman spectra with temperature is observed.The development of the linewidth and intensity for all modes with temperature is in sharp contrast to the case for pure C60.An anomalously large up-shift of 9 cm-1 between 20 K and room temperature for the pinch Ag(2) mode suggests the existence of hybridization between the C60 molecules and the intercalants.The relative intensity of the doublet of Ag(1) systemtically changes with decreasing temperature.
ULTRAHIGH-DENSITY DATA STORAGE ON AN ORGANIC MONOMER 3-PHENYL-1-UREIDONITRILE THIN FILM
Authors: SHI DONG-XIA  , SONG YAN-LIN  , ZHANG HAO-XU  , XIE SI-SHEN  , PANG SHI-JIN  , GAO HONG-JUN  ,   (1)中国科学院化学研究所分子科学中心,北京100080; (2)中国科学院物理研究所凝聚态物理中心真空物理开放实验室,北京100080; (3)中国科学院物理研究所凝聚态物理中心真空物理开放实验室,北京100080,东北大学机械工程与自动化学院,沈阳110006
Published: December 2020

Ultrahigh-density data storage on a 3-phenyl-1-ureidonitrile (PUN) thin film was performed using a scanning tunneling microscope. The recorded marks of 0.8 nm in diameter were obtained when voltage pulses of 4 V for 10ms were applied between the STM tip and highly ordered pyrolytic graphite substrate. The current-voltage relations at the local regions of the films indicate that the recorded region is conductive and the unrecorded region is in a high impedance state. A possible mechanism of this data storage was suggested and discussed.
STUDY OF SOLITONS INTERACTION IN INTEGRABLE MODELS
Authors: RUAN HANG-YU  ,   宁波大学物理系,宁波315211,浙江大学近代物理中心,杭州310027
Published: December 2020

Starting from bilinear form of integrable models, one can obtain a dromion solution that is localized in all directions or a “Solitoff” solution that decays exponentially in all directions except a preferred one for the physical field or a suitable potential. The interactions between dromions, dromion and “Solitoff”, solitons are studied in detail through the method of figure analysis for two KdV type equations. Some interactive properties between two dromions (solitons) are revealed for two models. The interactions between two dromions(solitions) may be elastic or inelastic for different form of solutions.
STUDIES ON INJECTEDFEELBACK AND DYNAMIC CONTROLS OF CHAOTIC SYSTEMS
Authors: YAN SEN-LIN  , WU SHI-BAO  , PANG HUAN-GANG  , SUN XIAO-HAN  , ZHANG MING-DE  ,   东南大学电子工程系,南京210096
Published: December 2020

A method of injected-feelback control of chaotic systems in Chai's circuits is put forward. By the method,the chaotic systems can be controlled in predetermined equilibrium states and the vibrational cyclical trajectories. With the change of control parameters,typical variation of physical state is studied to extend the applications of chau's circuits chaotic systems in Chai's circuits.
ABSORPTION OF FEMTOSECOND LASER PULSES BY ATOMIC CLUSTERS
Authors: LIN JING-QUAN  , ZHANG JIE  , LI YING-JUN  , CHEN LI-MING  , Lü TIE-ZHENG  , TENG HAO  ,   中国科学院物理研究所光物理开放实验室,北京100080
Published: December 2020

Energy absorption by Xe,Ar,He atomic clusters are investigated using laser pulses with 5mJ energy in 150fs duration.Experimental results show that the size of cluster and laser absorption efficiency are strongly dependent on several factors,such as the working pressure of pulse valve,atomic number Z of the gas.Absorption fraction of Xe clusters is as high as 45% at a laser intensity of 1×1015W/cm2 with 20×105Pa gas jet backing pressure.Absorption of the atomic clusters is greatly reduced by introducing pre-pulses.Ion energy measurements confirm that the efficient energy deposition results in a plasma with very high ion temperature.
POLYCHROMATIC PHOTOVOLTAIC SPATIAL SOLITON
Authors: WANG XIAO-SHENG  , HE GUO-GANG  , SHE WEI-LONG  , JIANG SHAO-JI  ,   中山大学超快速激光光谱学国家重点实验室,广州510275
Published: December 2020

A photovoltaic spatial soliton theory of duotone signal beam with monochrone background beam is presented, and a solution of bright soliton has been obtained by a numberical method. We have observed bright photovoltaic spatial solitons of polychromatic signal beam with monochrome background beam in a Cu:KNSBN crystal.
PRE-PEAK ON THE STRUCTURE FACTOR OF NON-CRYSTALLINE ALLOY Mg70Zn30
Authors: WANG HUAN-RONG  , YE YI-FU  , MIN GUANG-HUI  , TENG XIN-YING  ,   山东大学材料液态结构及其遗传性教育部重点实验室,济南250061
Published: December 2020

Using the X-ray diffraction techniques, the intensity, structure factor, pair distribution function and the nearest neighbor distance of non-crystalline alloy Mg70Zn30 were obtained. The experimental results show that there is a visible pre-peak on the structure factor of non-crystalline alloy Mg70Zn30 in the small Q region. According to the characters of the pre-peak, an atomic model of Mg70Zn30 melt was constructed, namely, a bcc structure with one Mg atom locates at the center and other eight Zn atoms lie on the vertexes. Combined with shared vertex, it can meet the requirement for the distance of Mg-Mg atoms. The origin of the pre-peak on the structure factor of non-crystalline alloy Mg70Zn30 is caused by the correlation between the central Mg atoms in neighboring clusters.
STUDY OF THE SYNTHESIS PROCESS AND STRUCTURAL DEFECTS IN Y-123 SUPERCONDUCTING SYSTEMS BY POSITRON EXPERIMENT
Authors: CHEN ZHEN-PING  , ZHANG JIN-CANG  , CHENG GUO-SHENG  , LI XI-GUI  , ZHANG XUN-SHENG  ,   (1)河南师范大学物理系,新乡453002; (2)郑州轻工业学院数理系,郑州450002
Published: December 2020

Using positron annihilation,X-ray diffraction and scanning electron microscopy experiments,the structural characteristics and preparation techniques for YBa2Cu3O7-δ systems are systematically studied.The results show that,for the samples sintered at 950℃,the orthorhombic disorder increases with the duration of sintering time.On the whole,with the increase of sintering temperature and time,the positron lifetime increases until it reaches a saturation value.It is proved that,under the condition of 920—950℃ for 12—72 h,the structural characteristics and superconductivity of Y-123 have good stability.The changes of defect with the sintering temperature and time are also discussed.This experimental results indicate that the positron experiment shows good stability and reliability.
OPTICAL ABSORPTION OF Ag-BaO THIN FILM IN THE VISIBLE AND NEAR-INFRARED REGION WITH APPLIED ELECTRIC FIELD
Authors: ZHANG QI-FENG  , HOU SHI-MIN  , ZHANG GENG-MIN  , LIU WEI-MIN  , XUE ZENG-QUAN  , WU JIN-LEI  ,   北京大学电子学系,北京100871
Published: December 2020

The optical absorption properties of Ag-BaO composite thin film with excess barium were measured while a vertical electric field was applied on the film surface.Total two absorption peaks were observed in the visible and near-infrared region,and only the peak that lies in the near-infrared region was dependent on the applied electric filed,i.e.,the absorption intensity was decreased with the increasing electric field.The dominant peak in the visible region is attributed to the surface plasmons resonance of Ag ultrafine particles embedded into the BaO semiconductor matrix.However,the weaker one in the near-infraed region is considered to arise from the transition of bound electrons at impurity energy level of the BaO semiconductor matrix,and such an impurity energy level is related to the negative ion vacancies caused by the excess braium in the BaO crystal.When the external surface electric field was applied,some of the impurities in the BaO Semiconductor matrix were ionized,and which further resulted in a decrease of the density of bound electrons at the impurity energy level.So that,part of the optical absorption owing to the impurity energy level was decreased with the enhanced electric field.
CHEMICAL BONDING STRUCTURE OF FLUORINATED AMORPHOUS CARBON FILMS PREPARED BY ELECTRON CYCLOTRON RESONANCE PLASMA CHEMICAL VAPOR DEPOSITION
Authors: NING ZHAO-YUAN  , CHENG SHAN-HUA  , YE CHAO  ,   苏州大学物理系,苏州215006
Published: December 2020

The a-C∶Fx films with low dielectric constant has been studied,considering that they can be used for interlayer dielectric in ultra-large integrated circuits.These films were deposited by using electron cyclotron resonance plasma reactor with CHF3 and C6H6 mixture as source gas.The effects of microwave power,pressure and CHF3/C6H6 ratios on the film deposition rates have been investigated.The fluorocarbon and hydrocarbon radical species in the plasma discharges were monitored by the optical emission spectra.The structural properties of the films were characterized by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy.A relationship between the radical species in the discharge plasma and bonding structure of the films is analysed.It demonstrates that CF2,CF and CH radicals play the important roles in the forming of films.
SYNCHRONIZING CHAOS BY DRIVING PARAMETER
Authors: YANG SHI-PING  , NIU YHAI-YAN  , TIAN GANG  , YUAN GUO-YONG  , ZHANG SHAN  ,   河北师范大学物理系,石家庄050091
Published: December 2020

The method of synchronizing chaos based on driving a certain parameter of chaotic systems using the chaotic signal outside is proposed. The Logistic map and the Lorenz systems are taken as two typical examples. The simulation results show that two identical chaotic systems can be synchronized completely when the change scope of the parameter driven is large enough. On the other hand, the different synchronization states depending on the initial conditions and the controlling parameter are found in Lorenz systems.
PROPAGATION OF QBG BEAMS THROUGH AN APERTUREDABCD OPTICAL SYSTEM
Authors: WANG XI-QING  , Lü BAI-DA  ,   (1)四川大学激光物理与激光化学研究所,成都610064; (2)西南交通大学应用物理系,成都610031
Published: December 2020

Based on the generalized Huygens-Fresnel diffraction integral, the propagation of the Bessel-modulated Gaussian beams with quadratic radial dependence (QBG beams) through a circle-apertured ABCD optical system has been studied.-In our treatment the circle function is expanded into a sum of complex Gaussian functions, thus a closed-form propagation expression of QBG beams has been derived. As an application example, numerical calculations have been performed for the focusing of QBG beams by an apertured lens. The calculatied results have shown the advantage of our method, and are in good agreement with those obtained by the straightforward numerical integration of the generalized diffraction formula.
TELEPORTATION OF AN UNKNOWN ATOMIC STATE THROUGHTHE RAMAN ATOM-CAVITY FIELD INTERACTION
Authors: LIN XIU  ,   中国科学技术大学量子通信与量子计算开放实验室,合肥230026;福建师范大学物理系,福州350007
Published: December 2020

A scheme is presented for the teleportation of an unknown atomic state through the Raman interaction of Λ-type three-level atom with a coherent state cavity-field of large amplitude.
HIGHER POWER SQUEEZING EFFECTS FOR ODD AND EVEN q-COHERENT STATES
Authors: WANG ZHONG-QING  ,   石油大学应用物理系,东营257061
Published: December 2020

The higher power squeezing effects of photon field for odd and even q coherent states have been studied. We find that the squeezing effects are influenced by the values of parameter q, and the odd and even q-deformed coherent states can exhibit odd power squeezing effect but no even power squeezing effect when parameter q is taken values departure from 1 greatly, and these squeezing characteristics are different from those of the conventional odd and even coherent states.
SOUND WAVE SCATTERING BY ELASTIC CYLINDER ENCASEDIN SOLID MATRIX WITH INTERPHASE LAYER
Authors: LU PENG  , WANG YAO-JUN  ,   南京大学近代声学国家重点实验室声学研究所,南京210093
Published: December 2020

The general equation for determining the scattered sound wave coefficients by an elastic cylinder encased in solid matrix is derived.A thin interphase layer between the matrix and cylinder is taken into account.The resonance modes and related eigenfrequencies in the backscattering spectra are discerned based on the Flax's theory.By using the spring model for interphase layer,the effect of the shear stiffness constant KT on the resonance scattering modes is evaluated.
PHYSICAL CELLULAR AUTOMATON THEORY FOR SIMULATING THE FAILURE PROCESS OF MICRO-HETEROGENEOUS MATERIAL
Authors: TAN YUN-LIANG  , ZHOU HUI  , WANG YONG-JAI  , MA ZHI-TAO  ,   (1)东北大学采矿系,沈阳110006; (2)山东科技大学工程力学系,泰安271019
Published: December 2020

Based on the physical and mechanical characters of micro-heterogeneous material such as rock and concrete,a new theory of physical cellular automaton (PCA) for simulating the failure evolving process of micro-heterogeneous materials is set up,according to the basic law of the transfer of energy.PCA breaks through the traditional cellular automaton method which is only a mathematical operation.It is shown by some laboratory tests that the simulating results by PCA can agree with the laboratory results perfectly,thus,PCA is an effective physical and mechanical method.