bluuebunny/crossref_metadata_2025 huggingface dataset:
Movimentos na Educação Matemática: tremores perfurantes nas verdades instituídas
Authors: Duarte Claudia Glavam , Gonçalves Kátia Liége Nunes , Mulazani dos Santos Luciane
Published: November 2020

Este artigo constrói – enquanto se faz – compreensões das autoras sobre uma Filosofia da Diferença para/na/da/sobre Educação Matemática, a partir de movimentos de pesquisa e de prática – de academia e de vida [de ser, de estar e de haver] – EXpostos nos artigos do Boletim online de Educação Matemática – BOEM que foram publicados na Edição Temática Educação Matemática e Filosofia da Diferença, em novembro de 2020, no número dezessete do volume oito. A provocação sobre tremores perfurantes nas verdades instituídas é nossa! É nossa, mas só despertada graças às dezesseis contribuições de colegas professores com/em formação, cujos textos colocam em evidência experiências, teorias e ideias sobre temas relacionados ao (des)foco da edição. Como resultado, apresentamos um convite à leitura e a reflexões para ampliação de compreensões a respeito da Filosofia da Diferença e de suas relações com a Educação Matemática.
A constituição de si: uma cartografia das subjetividades no devir professor de matemática dos Anos Iniciais do Ensino Fundamental
Authors: Souza Graciela Coelho Andrade de , Queiroz Simone Moura
Published: November 2020

Este trabalho apresenta um recorte das discussões e observações de campo realizadas para produção de dados da dissertação de mestrado “ALICE NO PAÍS DA DIFERENÇA: Uma aventura pelo devir professor de matemática dos Anos Iniciais do Ensino Fundamental”. A qual teve por objetivo principal compreender as subjetividades presentes no devir professor de matemática dos Anos Iniciais do Ensino Fundamental. Um estudo decorrente do método da cartografia das subjetividades, realizado durante a pesquisa de campo com professores de uma escola pública de Jaboatão dos Guararapes - PE. Embasado na filosofia da diferença de Deleuze e na perspectiva de sujeito e sociedade defendida por Foucault para pensar o professor e suas subjetividades. Os resultados encontrados desvelam o professor enquanto sujeito composto de subjetividades, onde em um emaranhado de marcas, afetos e desejos resultantes do trajeto antropológico, movimentos e devir, o que impacta na constituição de si legitimando as singularidades presentes no processo de ensino e aprendizagem matemática.
Desterritorializando a aula de Matemática: o que pode um professor militante no âmbito de uma educação matemática menor?
Authors: Risso João Paulo , Rodrigues Thiago Donda
Published: November 2020

Este artigo objetiva vislumbrar linhas de fugas, intuir resistências e possibilidades outras para as aulas de Matemática. Para tal articulação, partiremos da noção de Educação Maior relacionando-a a Matemática Escolar e em contraposição, deslocando os conceitos de literatura menor de Gilles Deleuze e Félix Guattari e de educação menor de Sílvio Gallo, discutiremos o conceito de educação matemática menor. Por fim, na última seção, apresentaremos uma possibilidade de prática em educação matemática menor. Destacamos que a educação matemática menor potencializa resistências aos mecanismos de controle social e a Matemática Escolar.
Gestión y edición de revistas académicas con software libre. El uso de Open Journal Systems 3.
Authors: Delgado Vázquez Ángel María
Published: November 2020

Este libro aborda el uso de gestores de contenido específicos para la gestión de revistas en el ámbito académico. Se centra concretamente en el uso de Open Journal Systems, un software de código abierto que, a día de hoy, forma parte de uno de los pilares fundamentales del movimiento por la Ciencia Abierta: poder publicar resultados de investigación por canales y cauces distintos a los comerciales. Creado y mantenido por el Public Knowledge Project, una iniciativa interuniversitaria que, a nivel global, promueve la mejora de la calidad y de la difusión de la publicación académica mediante el diseño de software libre, OJS va ya por su versión
número 3.
El trabajo contiene una breve introducción sobre el panorama de las revistas académicas, en la que además
se repasan las diferentes herramientas disponibles para su gestión. Tras ella, el libro se centra en desgranar los entresijos de la versión 3 de OJS, para constituir una guía para aquellos que quieran convertirse, o sean ya, gestores o editores de revistas académicas, siendo
de hecho la única que se ha publicado en español hasta el momento.
Ongoing Face Recognition Vendor Test (FRVT) part 6B :
Authors: Ngan Mei Lee , Grother Patrick J , Hanaoka Kayee
Published: November 2020

This is the second of a series of reports on the performance of face recognition algorithms on faces occluded by protective face masks commonly worn to reduce inhalation and exhalation of viruses. This is a continuous study is being run under the Ongoing Face Recognition Vendor Test (FRVT) executed by the National Institute of Standards and Technology (NIST). In our first report, we tested "pre-pandemic" algorithms that were already submitted to FRVT 1:1 prior to mid-March 2020. This report augments its predecessor with results for more recent algorithms provided to NIST after the COVID-19 pandemic was declared. While we do not have information on whether or not a particular algorithm was designed with face coverings in mind, the results show evidence that a number of developers have adapted their algorithms to support face recognition on subjects potentially wearing face masks. The algorithms tested were one- to-one algorithms submitted to the FRVT 1:1 Verification track. Future editions of this document will also report accuracy of one-to- many algorithms.
Coaching - nowe perspektywy i wyzwania
Authors:   Kozminski University, Zawadzka-Jabłonowska Agnieszka
Published: November 2020

Coaching rozwija się w Polsce i na świecie niezwykle dynamicznie i na wielu różnych poziomach. Ma coraz więcej zastosowań i ukonstytuował się już jako odrębna, społecznie rozpoznawana profesja. Pojawiają się nowe coachingowe koncepcje, podejścia, narzędzia oraz obszary specjalizacji. Jednocześnie rozwój coachingu uwarunkowany jest dynamicznymi zmianami zachodzącymi w przestrzeni ekonomicznej, politycznej, społecznej i kulturowej. Z jednej strony mamy do czynienia ze zmianami paradygmatów zarządzania we współczesnych organizacjach. W rezultacie obserwujemy transformację oczekiwań i wyzwań, z jakimi będą mierzyć się „liderzy przyszłości”. Z drugiej strony naukowcy nieustannie zgłębiają neuropsychologiczne podstawy ludzkiego zachowania. Wiemy zatem coraz więcej o tym, jak szybkie tempo rozwoju cywilizacji oraz intensywne korzystanie z nowych technologii wpływają na biopsychospołeczne funkcjonowanie człowieka. Niniejsza książka ukazuje wielowymiarowość zastosowań coachingu i różnorodność obszarów, w których może być stosowany. Zawiera przegląd koncepcji teoretycznych, a także opis metod badawczych i praktycznych narzędzi oraz modeli coachingowych. Zaprezentowane zostały również wyniki badań zrealizowanych przez autorów.
ACCURATE LINEAR DAMPING CALCULATION FORMULA FOR FREE VIBRATION SYSTEM
Authors: ZHU XIAN-FANG  , SHUI JIA-PENG  ,   中国科学院固体物理研究所,合肥的230031
Published: November 2020

An accurate linear damping calculation formula for free vibration system has been deduced and the application limits of the corresponding approximate calculation formula has been discussed as well. Finally, the related experimental results have been calculated respectively by the newly-deduced formula and the present approximate one, and the two kinds of calculated results have been compared, analysed, and discussed.
NONLINEAR ANELASTIC INTERNAL FRICTION PEAKS ASSOCIATED WITH DISLOCATION CORE DIFFUSION
Authors: GE TING-SUI  ,   中国科学院固体物理研究所,合肥230031;中国科学院力学研究所,北京100080
Published: November 2020

Early since 1950, a systematic study was made on the anomalous internal friction peaks appeared in cold-worked Al-Cu and Al-Mg specimens around room temperature. The activation energy associated with these internal friction peaks was found to be close to that associated with the pipe diffusion along dislocations. Consequently the internal friction peaks were attributed to the diffusion of Cu or Mg atoms in the dislocation core in aluminium. A physical model of these internal friction peaks was suggested in terms of the dislocation kink concept. The manifestation of these anomalous internal friction peaks was found to be similar to that predicted through a detailed mathematical analysis of the dislocation core diffusion by Winkler-Gneiwek et al. according to the string model. In this paper, a critical comparison has been made between the string model and the kink model concerning this problem and it is shown that the predictions derived from the string model can be adequately applied to the case of the kink model. This confirms further that the nonlinear anelastic internal friction peaks we observed are originated from dislocation core diffusion.
THE DIELECTRIC BEHAVIOR IN NANO-STRUCTURED MATERIALS TiO2(RUTILE)
Authors: ZHANG HONG-FEI  , WANG LIANG-ZHU  , ZHANG LI-DE  , WU XI-JUN  ,   (1)中国科学院固体物理研究所,合肥230031; (2)中国科学院固体物理研究所,合肥230031;浙江大学材料科学与工程系,杭州310027
Published: November 2020

The spectra of the dielectric constant vs. the measuring temperature and of the dielectric constant vs. the measuring frequency for the nanostructured rutile bulk samples prepared under different pressures were investigated. It can be observed that when the measuring frequency ω2 times higher than that in the high frequency range. Furthermore, with the increment of the pressure, the dielectric constant rises and dielectric loss decreases and shifts towards the low frequency. For the samples formed under 1.0 GPa, two peaks appear in the spectrum of dielectric constant vs. the measuring temperature, and their peak positions are 50℃ and 300℃ , respectively. According to dielectric polarization theory, it can be supposed that high dielectric constant of nanostructured rutile arises mainly from the electronic relaxation polarization, which takes place inside the particle components of nanostructured rutile, and the rotation direction polarization, which is established in interfaces of nanostructured rutile, The 50℃ peak and the 300 ℃ peak are, respectively, attributed to the electronic relaxation polarization and the rotation direction polarization.
EXPLICIT SOLUTIONS TO THE RIEMANN PROBLEM WITH ZEROS
Authors: YUE HONG  , HUANG NIAN-NING  ,   武汉大学物理系,武汉430072
Published: November 2020

When Lax pairs have property of anti-Hermitian evolution, the 2×2 matrix form Riemann problem with zeros is solved explicitly. And the multi-soliton solutions of the NLS equation and the sG equation are also found explicitly.
STABILITY OF SOLITARY WAVE FOR THE KdV TYPE EQUATIONAND TRAVELLING WAVE FOR THE KdV-BURGERS TYPE EQUATION
Authors: ZHU ZUO-NONG  ,   扬州大学农学院基础部,扬州225009
Published: November 2020

In this paper, it is shown that solitary wave for the KdV type equation and travelling wave for the KdV-Burgers type equation are unstable in the Liapunov sense . Some incorrect conclusions in literatures are corrected.
INTERACTION BETWEEN SOLITONS IN OPTICAL FIBERS
Authors: YAN JIA-REN  , MEI YU-PING  ,   (1)湖南师范大学物理系,长沙410081; (2)湘潭大学物理系,湘潭410005
Published: November 2020

The interaction between solitons of the nonlinear Schr?dinger equation is derived by the least action principle approach as a function of the soliton' s separation △ and their initial relative phase δ. The equation shows that two solitons with δπ/2 repel, and there is almost no interaction when δ=π/2, and that the interaction decreases exponential-ly as △ raises. The results obtained is well consistent with that of the experiment quantitatively.
EFFECTS OF SINGLE ELECTRON TUNNELING IN STM/STS STUDIES USING Fe TIPS
Authors: WANG CHEN  ,   华中师范大学物理系,武汉430070
Published: November 2020

We have used scanning tunneling microscopy working at 4.2 K to study the transition metal dichalcogenide 1T-TaSe2. The charge density wave (CDW) superstructure (131/2α0×131/2α0) and atomic modulation are well resolved, as well as the associated CDW energy gap. In particular we used high purity iron as tip material and demonstrated clearly the existence of single electron tunnel-ing (so-called Coulomb blocade) effects, further experiments with stainless steel tips also confirmed this observation. It is pointed out that during STM/STS studies tips covered with oxides are very likely to display Coulomb blocade effects due to their small capacitance. Therefore, extra cautious are needed when analyzing spectroscopic features in the area that could be affected by Coulomb blocade effects. At the mean time, high quality scanning images can still be regularly obtained through reso-nant tunneling process.
LIFETIMES OF FORBIDDEN TRANSITION STATES FOR TWO-STEP EXCITATION OF ATOM AND INFLUENCE OF ENVIRONMENTAL RADIATION
Authors: SHU XIAO-WU  , ZHANG SEN  , XIE WEI-JUN  , FANG DA-WEI  ,   (1)江西省九江师范专科学校物理系,九江332000; (2)浙江大学物理系,杭州310027; (3)中国计量学院基础部,杭州310034
Published: November 2020

The populations of np forbidden transition states for two-step excitation of Na atom have been obtained by appling the static field of strength 167 V/cm. We have obtained lifetimes of np(n = 19-23) states by the method of delaying ionization in pulsed electric field, and have compared the calculation values with the measured data. The influence of applied fields and environmental radiation on the determination of the lifetimes of the highly excited states were discussed.
EXPERIMENTAL STUDY ON DIFFRACTIVE PERFORMANCE OF CONCAVE GROOVES WITH SUBMICRON WIDTH
Authors: ZHENG SHI-HAI  , LI DE-HUA  , CHEN YAN-SONG  , DAI LUN  ,   (1)北京大学人工微结构与介观物理国家重点实验室,北京100871; (2)中国科学院物理研究所,北京100080
Published: November 2020

In this paper, a group of concave grooves with micron and submicron width was designed and fabricated by using photolithography, electron-lithography and ion etching techniques, and their diffractive performance was investigated in experiment. The experimental measured data show that the grooves have the feature of vector's diffraction.
RELATIONSHIP BETWEEN THE BROWNIAN MOTION OF THE SUSPENDED PARTICLES IN ERF AND THEIR AGGREGATION
Authors: WU FENG  , WANG BING-HONG  , YANG YUE-GUI  , YAO BIN  ,   (1)中国科学技术大学火灾科学国家重点实验室,合肥230026; (2)中国科学技术大学近代物理系和非线性科学中心,合肥230026; (3)中国科学技术大学力学与机械工程系,合肥230026; (4)中国科学技术大学力学与机械工程系和非线性科学中心,合肥230026
Published: November 2020

It is known that the Brownian motion is concerned with the aggregation of particle- chains in electrorheological fluids (ERF) under external field. In this paper we suggest a two-sphere model in which we assume that there is internal motion between two spheres but they keep separation from each other for simplifying particle-chain in ERF. Analysing the properties of the Brownian motion of the two-sphere system the result of its trace fractal dimension less than 2 is obtained. In view of the dimension of motion-trace a qualitative explanation of the aggregation of particle-chains in ERF subjected to external electric field, i.e. ,phase separation,is given.
A SELF-CONSISTENT MONTE CARLO SIMULATION OF IONS IN HOLLOW-CATHODE SHEATH OF ARGON GAS DISCHARGES
Authors: HAN JUN-BO  , WANG DE-ZHEN  , MA TENG-CAI  ,   大连理工大学物理系三束材料改性国家重点实验室,大连116023
Published: November 2020

In this paper, a self-consistent Monte Carlo simulation method including charge exchange and elastic scattering is developed, and the method is used to calculate the energy and angle distributions of ions, the density distributions of ions and electron in hollow-cathode sheath of a DC argon gas discharge for the different discharge conditions. Cross sections of the charge exchange and the momentum transfer that depend on the ion energy are taken into account precisely. It is found that, as the ions move towards the cathode, the high energy portions of ion energy distributions are enhanced gradually and the small angle portions of the angle distribution increase. A strong field accelerates the ions to higher speed and ensures more ions to move along the lines of force.
EXPERIMENTAL INVESTIGATION OF X-RAY RADIATION CHARACTERIZATION FOR CAVITY TARGETS
Authors: CHENG JIN-XIU  , MIAO WEN-YONG  , CHEN XIAO-FENG  , TANG DAO-YUAN  , DING YAO-NAN  , WEN TIAN-SHU  , HU XIN  , ZHU ZONG-YUAN  ,   中国工程物理研究院核物理与化学研究所,成都610003
Published: November 2020

The experimental investigation of X-ray radiation characterized by the cavity targets was carried out at the Shenguang laser facility. The temperature profile along the axis of the cavity target was given. The first X-ray radiation from the laser heating phase and the second X-ray radiation from the expanded plasma collision phase were measured. The time interval between the two radiations was about 1.2 ns. The spectrum of the radiation from the implosion region was similar to a Planck spectrum.
ANALYSIS OF CHARGE-EXCHANGE SPECTRA DURING NBI HEATING IN THE HT-6M TOKAMAK
Authors: LIU SHENG-XIA  ,   中国科学院等离子体物理研究所,合肥230031
Published: November 2020

Hydrogen ion energy spectra during NBI heating were investigated by energy analysis of charge-exchange neutral particle. The results indicate that ion temperature has been increased. The rise of ion temperature is in agreement with the values calculated by the method of the empirical scaling law.The Fokker-Planck equation is used to calculate charge-exchange spectra and ion temperature, and compare them with the experiment results.
SOLITON SOLUTIONS OF PERIURBED BURGERS-KdV EQUATION
Authors: HAI WEN-HUA  , XIAO YI  ,   (1)湖南教育学院物理系,长沙410012;中国高等科学技术中心(世界实验室),北京100080; (2)华中理工大学物理系,武汉430074
Published: November 2020

In this paper , we have studied a perturbed Burgers-Korteweg-de Vries equation ut+uux+βuxxx=εuxx,|ε|?1, Under first order approximation and travelling wave case, the direct perturba-tion method to find the general solution is established. By means of the single soliton solution of the zeroth order equation we have obtained the general soliton solution of the first order equation. It con-tains many diferent soliton solutions and any one of them describes an array of solitons in semi-infinite space. The analyses show that the dissipation e makes the bright soliton the lower and narrower and the dark soliton the shallower and narrower than unperturbed KdV soliton.
MAGNETOHYDRODYNAMICS WAVES IN A NONHOMEG-ENEOUS CURRENT-CARRYING CYLINDRICAL PLASMA
Authors: YANG WEI-HONG  , HU XI-WEI  ,   中国科学技术大学近代物理系,合肥230026
Published: November 2020

Considering the effects of both the finite ion-cyclotron frequency and the finite presure, We solved numerically the magnetohydrodynamics (MHD) equations describing a nonhomegeneous current-carrying cylindrical plasma. It is found that the resonant layer of the shear Alfven wave in an ideal plasma impelled by rf wave of antenna is not a singular layer and that Alfven wave can go across the resonant layer. The couple of an antenna with plasma is researched carefully and the results is given by some figures.
NUCLEATION OF THE A14Mn ALLOY DURING CONTAI-NERLESS SOLIDIFICATION IN A DROP TUBE
Authors: YU RI-CHENG  , ZHANG FU-XIANG  , ZHANG JUN  , WANG WEN-KUI  ,   (1)中国科学院国际材料物理中心,沈阳110015; (2)中国科学院物理研究所,北京100080
Published: November 2020

The nucleation and undercooling of Al4Mn alloy have been investigated with 1.2 meter long drop tube. Melt droplets were solidified in vacuum and various sizes of droplets were collected at the bottom of the tube. Besides orthorhombic Al6Mn and β-Mn phases, there are two approximants of the decagonal quasicrystal, one approximant of the icosahedral quasicrystal, and decagonal domains, observed in the droplets. However, the amount of each phase is different in samples of various sizes due to the different cooling rates and undercooling. The relationship between the phase composition and the sample size was discussed on the basis of the classical nucleation and growth theories.
GROWTH DYNAMICS OF NANO-CRYSTALLINE SILICON (nc-Si:H)FILMS AND ITS COMPUTER SIMULATION
Authors: LIN HONG-YI  , WU XU-HUI  , HE YU-LIANG  , CHU YI-MING  ,   (1)北京航空航天大学物理系,北京100083; (2)北京理工大学电子工程系,北京100081; (3)中国科学院电子显微镜实验室,北京100080
Published: November 2020

The hydrogenated nano-crystalline silicon (nc-Si:H) films have attracted more attention for peoples, because of their novel structure and peculiar properties. The nc-Si: H films are prepared by the high purity hydrogen diluted methane as the reactive gases and actived at r. f. and d. c. double power sources, in a conventional plasma enhanced chemical vapor deposition (PECVD) system. The film samples have been studied by means of high-resolution electron microscopy, Raman scattering spectroscopy, scanning tunneling microscopy and other means. Based on the analysis of fabricated processes of the nc-Si: H films, a fractal growth model which called diffusion and reaction limited aggregation (DRLA) model was proposed. It is shown that results of computer simulation agree with the experimental results.
TIME EVOLUTION OF A QUANTUM SYSTEM WITH HAMILTONIAN CONSISTING OF TIME-DEPENDENT LINEAR COMBINATION OF SU(l, 1)AND SU(2) GENERATORS AND THE HERMITIAN INVARIANT OPERATOR
Authors: LAI YUN-ZHONG  , LIANG JIU-QING  ,   (1)山西大学物理系,太原030006; (2)太原重型机械学院基础部,太原030024
Published: November 2020

We study the time evolution of a quantum system with Hamiltonian consisting of time-dependent linear combination of SU(1,1) and SU(2) generators. A proper hermitian invariant operator has been found to obtain not only closed formulas for the time evolution of quantum states but also the time evolution operators for both the SU(1, 1) and SU(2) systems. The time evolution operators have been used to investigate the time-dependent two photons and SU(2) squeezing states and squeezing properties of the time-dependent SU(1,1) coherent states.
STUDY OF HETEROGENEOUS ADSORPTION ON SURFACES BY SERS
Authors: FU SHI-YOU  , WANG MING-JI  , LIU YE-HOU  , ZHANG PENG-XIANG  ,   (1)大庆石油学院电子工程系,安达151400; (2)中国科学院物理研究所,北京100080
Published: November 2020

The adsorption kinetics of PABA molecules on silver surface and the influnce of chloride ions to it are discussed in detail. It is found that the adsorption of PABA on the silver surfaces is heterogeneous. The adsorption rate constant is affected by the difference of surface states greatly, but the heterogeneity parameter is in less degree. The adsorption heterogneity of PABA is changed by the competitive adsorption of chloride ions. PABA molecules with the of concentration of chloride ions. have turned homogeneous adsorption gradually from heterogeneous adsorption. The adsorption energy of PABA on silver surface is reckoned by the isotherms . It is further proved that the heteroge -neity of chemical adsorption means the adsorption state on the surface is not only one.
SCALING ANALYSIS OF DYNAMIC GROWTH
Authors: HAN FEI  , MA BEN-KUN  ,   (1)北京师范大宁物理系,北京100875; (2)北京邮电大学基础部,北京100088
Published: November 2020

Molecular-beam epitaxy and dynamic growth with long-range space and temporal correlations are analysed using scaling analysis approach. Rough and dynamic exponents are gained in strong-coupling and weak-coupling region respectively. Discussions are given and the reason why the weak-coupling region results are agree with that of dynamical renormalization group is also explained.
ZERO-POINT LATTICE VIBRATION IN MX COMPLEX
Authors: XU XUE-TONG  , YU ZHI-GANG  , SUN XIN  ,   中国科学院红外物理国家重点实验室,上海200083;复旦大学物理系,李政道物理学综合实验室,上海200433
Published: November 2020

The effect of zero-point lattice vibration on the CDW of MX Complex is investigated in a wide range of electron-phonon coupling by using a self-consistent renormalization method. In contrast to the polyacetylene, where the bond order wave exists well in arbitrary coupling, the effect of the quantum fluctuation on CDW of MX solid distinctly depends on the coupling. When the coupling is strong, the reduction of CDW is small;But, if the coupling is weak, the CDW is seriously suppressed and even nearly destroyed. This contrast is related to the fact that for weak coupling, the frequencies of both the acoustic and optical branches are small in polyacetylene, but these frequencies are not well different from the bare value ω0 in MX solid.
FREE ELECTRON MODEL STUDY ON INTERLAYER EXCHANGE COUPLING IN MAGNETIC MULTILAYERS
Authors: YANG GUO-LIN  , LI BO-ZANG  , LI LIE-MING  , SUN GANG  , WU JIAN-HUA  , PU FU-CHO  ,   中国科学院物理研究所,北京100080
Published: November 2020

Based on the free electron model, a self-consistent approach is adopted to calculate the Fermi energy and its variation with the layer thickness and the magnetlization alignment in magnetic multilayers . Then we study the effect of the thickness of magnetic and non-magnetic layers, especially of electron density on the oscillation period of interlayer exchange coupling in such multilayer. A comparison of our theoretical results with those obtained by using the grand potential method is made, we find that the oscillation period is strongly dependent on the electron density. When the electron density in magnetic layer is different from that in spacer, the period will change as changing the thickness ratio of spacer to magnetic layer. This new result agree with the latest experimental data. In addition, our calculation also shows that the coupling strength is mainly determined by the polarization force experienced by electrons, while the band mismatch does influence the phase and even the period of the coupling oscillation.
ANALYSIS OF TIME SERIES RECONSTRUCTION FOR DYNAMIC SYSTEM
Authors: YANG ZHI-AN  , CHEN SHI-GANG  , WANG GUANG-RUI  ,   (1)中国工程物理研究院北京研究生部,北京100088; (2)中国工程物理研究院北京研究生部,北京100088;北京应用物理与计算数学研究所,北京100088; (3)中国工程物理研究院北京研究生部,北京100088;北京应用物理与计算数学研究所,北京100088;中国科学院国际材料物理中心,沈阳110015
Published: November 2020

The topological properties of the delay-time reconstruction transformation of dynamic system are analysed by means of the Jacobian of the transformation. Results show that the topological properties depend not only on the reconstructing dimension, but also on the delay time, and on the conditional stability of a time series itself. The conditional Lyapunov exponent is used to judge whether a time series is good or bad. As an example, the R?ssler system is discussed.
INVESTIGATION ON THE MODE OF GROWTH UNIT FOR HYDROTHERMAL SYNTHESIS OF BARIUM TITANATE CRYSTALLITES(Ⅱ)——CALCULATION FOR THE STABILITY ENERGY OF THE GROWTH UNITS-AND THE FORMATION OF THE BARIUM TITANATE CRYSTALLITES-UNDER HYDROTHERMAL CONDITIONS
Authors: SHI ER-WEI  , YUAN RU-LIN  , XIA CHANG-TAI  , WANG BU-GUO  , ZHONG WEI-ZHUO  ,   (1)华东地质学院; (2)中国科学院上海硅酸盐研究所
Published: November 2020

The calculation results of the stability energy of the growth unit for hydrothermal barium titanate crystallites are reported and the nucleation as well as the growth of the crystallites under hydrothermal conditions are discussed.
MOLECULAR DYNAMICS STUDIES FOR POINT DEFECTS IN Cu3Au AND Au3Cu AND POINT DEFECT PROPERTIES OF ALLOYS WITH L12 STRUCTURE
Authors: WANG TIAN-MIN  , GU QIANG  , XING ZHI-QIANG  ,   兰州大学材料科学系
Published: November 2020

The possible point defect configurations in alloys with L12 structure were given and the formation energies,stable configurations and volumes of point defects in Cu3Au and Au3Cu were calculated by using the molecular dynamics methods and the many-body potentials proposed by G.J.Ackland and V.Vitek.In addition,we also discussed the point defect properties of L12 structured alloy.
LEEM STUDIES OF TWO-DIMENSIONAL OXIDATION ON W(110) SURFACE
Authors: CAI QUN  , M.S.ALTMAN  ,   (1)复旦大学应用表面物理国家重点实验室; (2)香港科技大学物理系
Published: November 2020

With increasing coverage,the adsorption of oxygen on W(110) surface can be- subdivided into chemisorption,two-dimensional oxidation and bulk oxidation. In this work,the new imaging technique low energy electron microscopy (LEEM) was used to investigate the two-dimensional oxidation on W(110) surface. With increasing O coverage,the low energy electron diffraction patterns change from (1×1) to p(2×1) structure,and then into p(2×2) with complex diffraction satellites. Using dark field LEEM mode,we have imaged the fractional spots near (00) beam. It was found that there were two kinds of regions with opposite contrast on the surface,i.e. the oxygen superstructure domains with different orientations. The distribution of these domains was related to surface defects,especially to surface steps. It was also indicated that the temperature played a very important role for surface oxidation.
EXCITONIC OPTICAL NONLINEARITIES FOR ZnSe THIN FILM
Authors: ZHANG XI-QING  , FAN XI-WU  , CHEN YI-MIN  , Lü YOU-MING  , ZHENG ZHU-HONG  ,   (1)复旦大学应用表面物理国家重点实验室; (2)中国科学院长春物理研究所激发态物理开放研究实验室
Published: November 2020

We present a simple,but highly sensitive,method for obtaining both the sign and magnitude of the nonlinear refractive index and the nonlinear absorption coefficient as a function of wavelength. It is shown theoretically that these paramters can be easily obtained from the linear and nonlinear thansmission spectra of the medium as well as the laser intensity distribution on the frequancy. This technique is demonstrated for ZnSe thin film at 77K and room temperature.
SELF-GENERATED MAGNETIC FIELDPRODUCED IN PREPLASMA CHANNEL
Authors: ZENG GUI-HUA  , YU WEI  , SHEN BAI-FEI  , XU ZHI-ZHAN  ,   中国科学院上海光学精密机械研究所
Published: November 2020

An equation for self-generated magnetic field is derived,and is used to investigate the self generated magnetic field produced by an intense short laser pulse in preplasma channel.The results show that the magnetic field can be generated by the ponderomotive mechanism,and the cavitation influences the magnetic field.The structure of the magnetic field in a plasma channel is also demonstrated.
SURFACE RELAXATION AND ITS INFLUENCE ON THE-FERMI LEVEL PINNING OF Zn/GaAs(110)
Authors: WANG EN-GE  ,   中国科学院物理研究所表面物理国家重点实验室;中国科学院凝聚态物理中心
Published: November 2020

Under the tight-binding approximation, the geometric structure of the Zn/GaAs(110) surface is calculated by a self-consistent total energy method. It is found that the surface relaxation structure is a universal characteristic for low coverage adsorption, which is important in determining the Fermi level. The bonding states are pinned at 0.73eV above the top of the valence band by the covalent hybridization of the highly localized Zn s orbitals and the surface Ga sp３ dangling bonds. A comparison is made with theoretical and experimental results of free and other adsorbate GaAs(110) surfaces.
FLUORESCENCE SPECTRA OF Ge-NANOCRYSTALLITESEMBEDDED IN SiO2 THIN FILMS
Authors: YUE LAN-PING  , HE YI-ZHEN  ,   中国科学院固体物理研究所
Published: November 2020

The fluorescence spectra of Ge-nanocrystallites embedded in SiO2 thin films prepared by the ion-beam sputtering technique have been measured at room temperature.A strong visible photoluminescence with a peak at 2.95eV under exciting radiation of λ=300nm,and two luminescence peaks at about 2.95eV and 2.64eV under exciting radiation of λ=633nm are observed in the wavelength region of 380—520nm in the annealed samples.A possible mechanism for the photoluminescence in the visible region based on the quantum confinement of excitons in the nanometer-size Ge particles and recombination of the surface states has been proposed.The results also suggest that the interesting optical properties observed,of this new class of thin films with practical importance could be closely related to the new structure behavior of Ge-nanocrystallites,which is definitely different from that of the bulk Ge-crystals.
VISIBLE ELECTROLUMINESCENCE FROM SILICONNANOCRYSTALLITES PREPARED BY PLASMAENHANCED CHEMICAL VAPOR DEPOSITION
Authors: TONG SONG  , LIU XIANG-NA  , WANG LU-CHUN  , YAN FENG  , BAO XI-MAO  ,   南京大学物理系固体微结构物理国家重点实验室
Published: November 2020

We have observed visible electroluminescence (EL) from silicon nanocrystallites which are embedded in a-Si∶H films prepared in a plasma enhanced chemical vapor deposition system. The EL spectra are in the range of 500nm to 850nm with two peaks located at about 630—680nm and 730nm respectively. We found that the intensity of EL peaks is related closely to the conductivity of the deposited films. The carrier conduction path is discussed in terms of the material structural- characteristics, and a tentative explanation of the light emission mechanism is proposed.
REFLECTIVITY OF A KIND OF CANTOR FRACTAL FILM SET INCLUDING ABSORBING MATERIALS
Authors: LI YAN  , HE QING-LI  , HE DA-REN  ,   (1)西北大学物理系; (2)扬州大学师范学院物理系;中国科学院理论物理研究所
Published: November 2020

This paper discusses a kind of Cantor fractal film set including absorbing materials. The reflectivity of the film set is calculated and the characteristics of the reflection spectrum is discussed. Unlike the situation where absorbing materials do not exist,there is no self similarity in the whole reflection spectrum. However,under certain conditions the part of the spectrum beyond a certain frequency is approximately self similar.
PHOTOVOLTAIC INVESTIGATION ON THE STRAINED InGaAs/GaAs QUANTUM WELL
Authors: WU ZHENG YUN  , WANG XIAO JUN  , YU XIN  , HUANG QI SHENG  ,   厦门大学物理系
Published: November 2020

The low temperature photovoltaic (PV) spectroscopy was used to study the optical transitions between subbands of strained In0.18Ga0.82As/GaAs quantum well,experimental results are well consistent with that of theoritical calculation. The dependence of PV peak transition energy on temperature has been analysed and the strain factor and conduction band offset Qc for quantum well have been found to be almost independent of temperature.The full width at half maxium (HWHM) of transition peaks as a function of temperature has been studied. From a good fit,we discuss the influences of the exciton phonon coupling,alloy disorder and interface roughness on the line shape.
A NEW METHOD OF SURFACE PASSIVATION FOR MERCURY CADMIUM TELLURIDE
Authors: GONG HAI-MEI  , LI YAN-JIN  , FANG JIA-XIONG  ,   中国科学院上海技术物理研究所
Published: November 2020

We have developed a new method of passivating the surfaces of mercury cadmium telluride (MCT) by growing anodic oxidation films in a pulse mode. A novel equipment of pulse anodic oxidation was designed and developed successfully. The interface obtained by this method was superior to that grown by the traditional constant current. The influence of pulse oxidation on MCT surface was investigated by means of SEM, AES and photoconductivity decay. The optimum pulse oxidation condition to reduce the surface recombination velocities has been investigated. The mechanism of the growth of pulse oxidation film is analyzed and discussed.
THEORETICAL STUDY ON LUMINESCENCE-SPECTROSCOPY OF NANO CRYSTAL X1-Y2SiO5: Eu3+
Authors: DUAN CHANG-KUI  , XIA SHANG-DA  , ZHANG WEI PING  , YIN MIN  , MA YI  ,   (1)中国科学技术大学结构分析开放研究实验室;中国科学技术大学物理系; (2)中国科学技术大学结构分析开放研究实验室;中国科学技术大学物理系;北京大学稀土材料化学及应用国家重点实验室; (3)中国科学技术大学物理系
Published: November 2020

Based on the electrostatic crystal field model of Faucher et al., in which the induced electric dipoles of ligands are obtained from a set of self consistent combined equations and the contributions from farther ligands are considered,the crystal field energy parameters of nano crystal X1-Y2SiO5: Eu3+ are calculated by using related data of its crystal structure and physical properties.Moreover,we successfully extend the above model to calculate the transition intensities,thus giving a theoretical luminescence spectroscopy,which approximately agree with the experimental one.Additionally,the useful wavefunctions of crystal field states are obtained in this calculation process thereby.
MICROSTRUCTURE AND PHYSICAL PROPERTIES OF SrBi2Ta2O9 FERROELECTRIC THIN FILMS
Authors: YANG PING-XIONG  , DENG HONG-MEI  , ZHENG LI-RONG  , LIN CHENG-LU  ,   中国科学院上海冶金研究所信息功能材料国家重点实验室
Published: November 2020

High quality SrBi2Ta2O9 thin films on Pt/Ti/SiO2/Si substrates were obtained using pulsed laser deposition combined with annealing at 700℃ in oxygen. The high diffraction peak of(008) and (115) was characterized by X-ray diffractometer.Good ferroelectric properties were obtained from the thin films;the remnant polarization and coercive field were about 10μC/cm2 and 57kV/cm, respectively. No fatigue was observed at up to 1010 switching cycles.Leakage current and the dc breakdown field measurement were about 4×10-8A/cm2 at 5V and 250kV/cm,respectively.
FOKKER PLANCK CALCULATION OF THE THERMAL-BARRIER FORMED BY SLOSHING ELECTRONS IN A MAGNETIC MIRROR
Authors: ZHANG JIAN-DE  , FANG YU-DE  , QIU LI-JIAN  , REN ZHAO-XING  ,   (1)国防科技大学应用物理系; (2)中国科学院等离子体物理研究所
Published: November 2020

The physical process of using ECRH to produce sloshing electrons and to form tandem mirror thermal barrier is calculated by means of Fokker Planck kinetic equation.The results show that (1)under certain conditions,the sloshing electron plasma configuration has been formed,the density ratios of which neh(Zr)/neh(0)=2.15 and the potential dip ΔФ=16.5V have also been formed;(2)there are three stages consisting of rapid establishment,gradual decrease and stable equilibrium in the establishment of potiential dip,which result from the coaction of ECRH,collision scattering and trapped ions.
INVESTIGATION OF THE ATOMIC STRUCTURE OF SURFACES BY MEANS OF FORWARD SCATTERING OF MEDIUM ENERGY ELECTRONS
Authors: ZHOU XU-BIN  , JI HANG  , LI XIAO-WEI  , ZHAO RU-GUANG  , YANG WEI-SHENG  ,   北京大学人工微结构和介观物理国家重点实验室
Published: November 2020

The atomic structure of several surfaces has been investigated on the basis of the real space patterns formed by forward scattering of medium energy electrons from the surface.The images of the Cu(111) surface show not only that the surface has the three fold symmetry but also that the fcc stacking sequence persists up to the topmost atomic layer.The images of the Si(111)(31/2×31/2)R30°-In surface support that In atoms occupy the T4 sites on the surface,rather than the H3 sites.In the case of Ge(111)(31/2×31/2)R30°-Ag surface the images indicate that the honeycomb chained triangle (HCT) model is correct.The success of these applications shows that reliable structural information of surfaces can be obtained quite straightforward by means of forward scattering of medium energy electrons,instead of via complicated calculations such as involved in LEED crystallography.
LOCAL WORK FUNCTION MEASURED WITH SCANNING TUNNELING MICROSCOPY
Authors: JIA JIN-FENG  , GAI ZHENG  , YANG WEI-SHENG  , K.INOUE  , Y.HASEGAWA  , T.SAKURAI  ,   (1)The Institute for Materials Research,Tohoku University,Sendai 980-77,Japan; (2)北京大学物理系人工微结构和介观物理国家重点实验室
Published: November 2020

In the present paper we report local work function measurements on the Cu(111)-Au and Pt(111)-Ag surfaces using scanning tunneling microscopy (STM).By measuring the response of tunneling current to the variation of the tunneling gap distance a work function image can be obtained simultaneously with a topographic STM image. By means of this technique,we are able to detect the difference between the local work functions of the overlayer and the substrate in both Cu(111)-Au and Pt(111)-Ag cases.Our results show that the local work function of the Au overlayer is between those of Au(111) and Cu(111) surfaces,supporting the results obtained with other techniques. In the case of the Pt(111)-Ag surface the local work function depends on the local thickness of the Ag overlayer.
INTERNAL FRICTION FEATURES OF FOAMED Al IN-LOWER FREQUENCY
Authors: LIU CHANG-SONG  , HAN FU-SHENG  , ZHU ZHEN-GANG  ,   中国科学院固体物理研究所内耗与固体缺陷开放研究实验室
Published: November 2020

Foamed aluminium (Al) specimens have been prepared by powder metallurgy foaming technique.At room temperature,variations of its internal friction vs porosity,frequency and strain amplitude were measured systematically.The results indicate that internal friction of foamed Al has such characteristics as follows.It increases with increasing porosity and with decreasing pore size.At lower frequencies,it is independent of frequency;it-has a normal amplitude effect.The damping mechanism of foamed Al has been studied.According to the damping mechanism of foamed Al,the experimental results have been explained with some success.
THE INFLUENCE OF s-f EXCHANGE EFFECT AND ELECTRON-EXCHANGE EFFECT ON THE SPECIFIC-HEAT OF CONDUCTING ELECTRON
Authors: GUAN LI-QIANG  , WANG CUI  , LI ZHEN-JI  , JIN GUANG-XING  ,   延边大学物理系
Published: November 2020

Based on the s-d interaction model,we consider the influence of s-f exchange effect on the electron-phonon coupling and discuss the specific heat of conducting electron in a rare earth metal.The results of calculation show that the specific heat of conducting electron can be written as γ＝γ0＋γep＋γex＋γs-f, where γ0 =(πkB/?kF)2m ,γep=γ0λep ,γex=γ0λex ,γs-f =γ0λs-f;here ep =e-p coupling,ex=exchange,s-f=s-f exchange.
MAGNETO TRANSPORT CHARACTERIZATION OF MBE GROWN Hg1-xCdxTe
Authors: GUI YONG-SHENG  , ZHENG GUO-ZHEN  , CHU JUN-HAO  , GUO SHAO-LING  , TANG DING-YUAN  ,   中国科学院红外物理国家重点实验室
Published: November 2020

A hybrid conduction analysis method mixed with multi carrier fitting procedure and mobility spectrum is present to analyze the experimental Hall and resistivity data of MBE grown Hg1-xCdxTe samples as a function of magnetic field.This method enables the conductivity contribution of bulk electron to separated from that of interface electron.Applications to temperature dependent Hall and resistivity data confirm that the procedure may be regarded accurate and reliable one.The method seems to be a suitable tool for the routine electrical characterization of semiconductor materials and devices.
SURFACE CHARACTER OF TITANIA CHANGED BY EXCIMER LASER
Authors: WEN XIAO-MING  , XIE CHONG-WEI  , LIN LI-ZHONG  , CUI YONG-JIE  ,   (1)云南大学物理系; (2)云南省分析测试中心
Published: November 2020

The electric conductivity changes markedly when titania is irradited by a proper-fluence excimer laser, it changes from insulator to semiconductor at room temperature, and its color changes too. Several titania samples before and after irradiation are studied with XRD, XPS and microscopic analyses. It is observed that the changes takes place when proper-fluence excimer laser pulse irradites the surface of titania and the temperature of the surface rises quickly. A thin layer of the irradited area melts quickly and soon resolidifies. This leads oxygen in titania to vacate partly, so the stoichiometry of the sample deviates from the normal value. The laser fluence threshold is estimated by the equation of heat transfer and the result agrees approximately with the experiment.
ERROR ANALYSIS FOR THE FAR-FIELD OF A SMALL PLANE SOURCE
Authors: ZENG XIAO-DONG  , LIANG CHANG-HONG  , AN YU-YING  ,   西安电子科技大学技术物理系
Published: November 2020

Based on a rigorous far-field solution of the Helmholtz equation,the dependence of the far-field of the light wave with a large divergence angle on the perturbation of the source profile is discussed,and the error formulas of the far-field amplitude and phase are also given.It is shown that the far-field errors must be described by using the “error area” of the source.In the paraxial region,the far-field amplitude and phase are not sensitive to the source perturbation,but,in off-axis region,they may be sensitive.
SQUEEZED BOSON PAIR NUMBER STATES IN QUANTUM BOSE FLUID
Authors: LIU WEN-SEN  , MA GUI-RONG  , ZHANG JIU-AN  , LIANG JIU-QING  ,   (1)河北师范大学物理系; (2)山西大学理论物理研究所; (3)山西大学物理系
Published: November 2020

The closed expressions with a parameter of the Bogoliubov unitary transformation are derived. The reduced Hamiltonian of the quantum Bose fluid is diagonalized in the original particle number representation. The manifestation of nonclassical character in the two mode radiation is extended to the quantum Bose fluid. Finally, the eigenstates of the Hamiltonian are established to be the squeezed boson pair number states with a nonclassical character.
ANTIBUNCHING EFFECT OF TWO PHOTON FLUORESCENT LIGHT FOR A TWO LEVEL ATOM IN A SQUEEZED VACUUM
Authors: FENG XUN-LI  , HE LIN-SHENG  , LIU YONG-LIANG  ,   (1)山东德州师范专科学校物理系; (2)中国科学院安徽光学精密机械研究所; (3)中国科学院安徽光学精密机械研究所;青岛海洋大学物理系
Published: November 2020

By using the two photon Bloch equation and quantum regression theorem, the second order correlation function of two photon fluorescence of a two level atom in a broad band squeezed vacuum is obtained. From this, the bunching and the antibunching effects of two photon fluorescence are investigated. We find that the second order correlation function is dependent on the squeezing parameter (|M|) of the squeezed vacuum. There is a critical value (Γ/4g) for |M|,above which the second order correlation function oscillates around 1. This indicates that the two photon fluorescence can exhibit both antibunching and bunching effects. Below the critical value, the second order correlation function does not oscillate and the two photon fluorescence exhibits the antibunching effect only.
LARGE PARAMETRIC GAIN FROM THREE MODE RESONANCE CAVITY
Authors: ZHANG TIAN-CAI  , LI TING-YU  , PAN QING  , ZHANG YUN  , XIE CHANG-DE  , PENG KUN-CHI  ,   山西大学光电研究所
Published: November 2020

The parametric gain of the ring and standing cavities was studied in this paper. By using the strong output of frequency doubled and stabilized Nd:YAP laser at 0．54μm as the pump source and the fundamental output at 1．08μm as the signal and idler modes, strong coupling of three modes in the ring or standing cavities is demonstrated. An optical wedge and a temperature controller are used to realize the three mode resonance simultaneously. Parametric gain as high as 110 is obtained. The relation between the gain and the pump power is also measured and the result fits to the theory on the whole.
INVESTIGATION OF THE CRYSTALLINE QUALITY AND SURFACE STRUCTURE OF SrTiO3 SUBSTRATE WAFERS BY X-RAY METHODS
Authors: LI CHAO-RONG  , ZHU AI-JUN  , DAI DAO-YANG  , MAI ZHEN-HONG  ,   (1)中国科学院凝聚态物理中心;中国科学院物理研究所; (2)中国科学院物理研究所;中国科学院微重力实验室
Published: November 2020

The crystalline quality of two SrTiO3 substrate wafers has been analyzed by X-ray double crystal rocking curve and topography.The surface structures of these two samples are investigated by grazing X-ray specular reflectivity and diffuse scattering.Results show that there are mosaic defects in both samples,but the crystalline quality of one sample is relatively high.There is big difference in the surface structures of these two samples.The root mean roughness σ of one sample is only (0.5±0.1)nm,while the other one is as high as (1.3±0.1)nm.The lateral correlation length of one sample is (1200±200)nm,but another is (300±20)nm.The rough surface will enhance the X-ray diffuse scattering and reduce the specular reflectivity.The substrate wafer with higher crystalline quality has also a relative smooth surface and is suitable for epitaxial growth.
THE FORMATION OF HELIUM BUBBLES IN 316L STAINLESS STEEL IRRADIATED WITH 2.5 MeV He+ IONS
Authors: ZHANG CHONG-HONG  , CHEN KE-QIN  , WANG YIN-SHU  , SUN JI-GUANG  ,   (1)北京有色金属研究总院; (2)中国科学院近代物理研究所
Published: November 2020

Specimens of 316L stainless steel are irradiated with 2.5 MeV He+ ions at temperatures of 400,500 and 550℃,respectively.For each implantation the dose and dose rate are separately 2.5×1021 ion/m2 and (3.2—3.8)×1016 ion/m2s-1.Bubble structures are investigated with cross sectional transmission electron microscopy(XTEM).The measured apparent activation energies provide evidence that the formation of bubbles is controlled by He diffusion via the self interstitial/He replacement mechanism.Good agreement is found between our results and other low dose experimental data,indicating that the underlying mechanism holds constant for different implantation conditions.The pre implantation cold working enhances significantly the nucleation of bubbles,and the dislocations are favorable sites for bubble nucleation in the investigated temperature range.
STATISTICAL THEORY OF SPONTANEOUS POLARIZATION IN SmC* LIQUID CRYSTALS
Authors: QIAN XIANG-ZHONG  ,   淮南矿业学院基础部
Published: November 2020

With cell model,the polarized order parameter is defined on cell center.By choice of interaction potential of biaxial molecules possessing a permanent electris dipole moment transverse to molecular axes,the system free energy is obtained.The approximate formula of spontaneous polarization and pitch is derived by calculation of variation to the free energy.We have calculated the temperature and the molecular transverse electric dipole dependence of the spontaneous polarization and pitch for four classic SmC* liquid crystals of DOBAMBC and 3M2CPOOB etc.The calculations agree satisfactorily with experimental results.It is shown that the spontaneous polarization is mainly due to the molecular biaxiality and transverse electric dipole of the SmC* liquid crystals.