bluuebunny/crossref_metadata_2025 huggingface dataset:
A PHASE DIAGRAM OF THE ALLOYS OF THE NEODYMIUM-NICKEL BINARY SYSTEM
Authors: PAN YU-YING  , ZHENG JIAN-XUAN  ,   广西大学物理系
Published: November 2020

The neodymium-nickel binary system has been studied by X-ray diffraction method and differential thermal analysis and the phase diagram determined.In this system, the following eight intermetallic compounds were observed: Nd3 Ni (M. P. 590℃), Nd7Ni3(M. P. 616℃), NdNi (M.P.780℃), NdNi2(decomposes at 940℃),NdNi3 (decomposes at 1030℃), Nd2Ni7 (decomposes at 1234℃), NdNi5(M.P. 1420℃)and Nd2Ni17. Intermetallic compound Nd2Ni17 forms peritectically 1300℃ and decomposes through a eutectoid reaction into Ni and NdNi5 at 1250℃. Five eutectics occur: Nd-Nd3Ni (570℃,～19at%Ni), Nd3Ni-Nd7Ni3 (565℃,～27at%Ni),Nd7Ni3-NdNi (540℃,～35at%Ni),NdNi-NdNi2(720℃,56at%Ni) and Nd2Ni17-Ni (1290℃,91at%Ni). Neither Nd in Ni nor Ni in Nd shows any detectable solid solubility.
THE CURRENT-VOLTAGE HYSTERISIS FOR THE SUPE-RCONDUCTING CROSSED-FILM TUNNELING JUNCTION
Authors: ZHANG YU-HENG  , LIU HONG-BAO  , CHEN GENG-HUA  ,   (1)中国科学技术大学物理系; (2)中国科学院物理研究所
Published: November 2020

We point out in this paper that for the superconducting crossed-film tunneling junction, the tunneling electrical current must raise the temperature in the junction area and also produce a nonomogeneous self-induced magnetic field simutaneously. It causes the superconducting film to transform into intermediate state. By means of this physical model we not only can explain the hysterisis in I-V curves of nonequilibrium superconducting Pb films and the existance of thresheid current I(t3) revealed in previous experiments, but also predict the existance of the hysterisis, a strange phenomenon, in the usual tunneling I-V curves.
EXACT SOLUTION OF A DILUTE DOUBLE BOND POTTS MODEL ON THE DECORATED SQUARE LATTICE
Authors: YANG ZHAN-RU  , F. Y. WU  ,   (1)北京师范大学物理系; (2)美国波士顿东北大学
Published: November 2020

The critical behavior of a dilute double bond Potts model on the decorated square lattice is investigated. The exact equations of critical surface and phase diagrams are obtained in some special cases. In particular, our results exhibited a distinctive low-temperature phase at q≤3 on two-dimension lattice for the dilute antiferromagnet Potts model, as expected.
VARIATIONS OF INDUCED MAGNETIC ANISOTROPY,MAGNETOSTRICTION AND STRAIN IN A METALLIC GLASS WITH ANNEALING UNDER FIELD AND TENSION
Authors: CHEN DU-XING  ,   冶金工业部钢铁研究总院
Published: November 2020

Based on simultaneous measurements of magnetic anisotropy, magnetostriction, and strain in the same ribbon specimen of metallic glass Co65.2Fe4.2Ni3Nb1Al2Si9.8B14.8 after various anneals under a transverse field and a tension, an experimental comparison among the variations of these parameters has been made. The behaviours of strain-induced anisotropy and transient creep exhibits some sort of similarity, but there is not a corresponding or a causality relation between them. The variations of magnetization-induced anisotropy Kum, straininduced anisotropy Kus saturation magnetostriction constant λs, and annealing strain with isochronal anneals show that they behave different kinetics, so further separate studies seem to be needed.
NONEQUILIBRIUM IONIZATION PROBLEM ANALYZED BY USING MULTIPLE-TIME-SCALE PERTURBATION THEORY
Authors: CHANG TIE-QIANG  ,   应用物理与计算数学研究所,北京
Published: November 2020

This paper analyzes nonequilibrium ionization problem by using multiple-time-scale perpurbation theory. The processes which are responsible for electron's average occupation probabilities Pn generally have much different time scales. In this paper the transitions between two neighbouring bound energy levels are considered as fast, the others, including the ionization processes, as slow. It is especially suitable for lower levels of high Z elements. The theory presented here gives analytic expressions for Pn as functions of ne, the number of free electrons. As a result, instead of solving equitions of dPn/dt we just need solving the differential equation for ne. So the problem is much simplified with avoiding the strong stiff which exists in equations dPn/dt. When radiation field reaches the Planck distribution, the Pn obtained here can naturally change into the Fermi-Dirac distribution.
ON THE LOW MOBILITY OF GaAs
Authors: ZHOU BING-LIN  , CHEN ZHENG-XIU  ,   中国科学院上海冶金研究所
Published: November 2020

The temperature dependence of electron mobility on 5 undoped LPE-GaAs samples has been measured. It was found that the experimental curves cross each other and this is difficult to explain by only one extrinsic scattering mechanism (ionized impurity scattering). Therefore, it's necessary to assume another extrinsic scattering mechanism, so called mobility killer. Because the samples we used are rather pure, the central-cell scattering suggested by Stringfellow et al. can certainly be neglected. The effect of illumination on the electron concentration and mobility at 77 K has been studied and it is considered that the nature of mobility killer is probably the spacecharge regior caused by the microscopic inhomogeneities in samples.
TIME DEPENDENT SOLUTION OF FOKKER-PLANCK EQUATION WITH NON-LINEAR DRIFT FORCE
Authors: HU GANG  ,   北京师范大学物理系
Published: November 2020

A new approach of the O-expansion of the Green's function is empoyed to study the time dependent problem of the Fokker-Planck equation. The scaling region and the final region in the scaling theory is unified to a single region. As t→∞ the time dependent solution approaches the stationary solution of the Fokker-Planck equation. The difficulty of matching the last two time regions in the scaling theory is then avoided.
THEORETICAL CALCULATION OF PULSED ACTIVE-PASSIVE MODE-LOCKED SOLID-STATE LASERS (Ⅰ)——THEOEETICAL MODEL
Authors: ZHU ZHEN-HE  ,   中国科学院物理研究所
Published: November 2020

A theoretical model for pulsed active-passive mode-locked solid-state lasers is presented in this paper. The characteristics of these lasers can be solved by computer simulation with this model.
ON THE SINGULAR PERTURBATION SOLUTION OF BOLTZMANN EQUATION (Ⅰ)
Authors: DING E-JIANG  , HUANG ZU-QIA  ,   北京师范大学低能核物理研究所
Published: November 2020

In this paper, we use a kind of singular perturbation method to find the normal solution of the Boltzmann equation with small Knudsen number. It is proved that the secular terms may be removed by improving the Hilbert expansion and Enskog expansion.
ANOMALOUS CHANGE OF DIELECTRIC AND ELASTIC PROPERTIES AND p-T PHASE DIAGRAM OF LiKSO4 CRYSTALS
Authors: YAO YU-SHU  , WANG RU-JU  , WANG JI-FANG  , HE SHOU-AN  , ZHANG LIANG-KUN  ,   中国科学院物理研究所
Published: November 2020

We studied the dielectric and elastic properties of LiKSO4 crystal under various temperature (150-350 K) and pressure (0-10 kbar). An anomalous change of the dielectric and elastic constants was found near the room temperature and 8.2 kbar (correspond to raising pressure) and 4kbar (correspond to releasing pressure). We attribute this anomalous change to the phase transition induced by the pressure. The process of this phase transition is accompanied by large pressure hysteresis.We also obtained the p-T phase diagram of LiKSO4 in these temperature and pressure range. A triple point was found near 3.8 kbar and 281 K.
THE SIMPLIFICATION OF X-RAY ANOMALOUS DISPERSION METHOD IN DETERMINING PARTIAL RADIAL DISTRIBUTION FUNCTION (PDF) OF THE AMOPHOUS BINARY ALLOY Fe82B18
Authors: LI HUA-RUI  , LIU HENG-DA  , DONG KE-ZHU  ,   北京钢铁学院
Published: November 2020

The radial distribution function (RDF) of amorphous alloy Fe82B18 was determined by using three different wave lengths of X-ray radiation (Mo, Cu, Co). And their influences on the determination of RDF were compared.The PDF for amorphous binary alloy Fe82B18 were calculated by means of X-ray anomalous dispersion method. In the calculation, the contribution of B-B atom pairs to RDF was neglected. Therefore, the calculation procedure was simplified and the accuracy of calculation increased.
ON THE SINGULAR PERTURBATION SOLUTION OF BOLTZMANN EQUATION (Ⅱ) "INITIAL LAYER" SOLUTION
Authors: DING E-JIANG  , HUANG ZU-QIA  ,   北京师范大学低能核物理研究所
Published: November 2020

In solving Boltzmann equation with a small Knudson number, we improved Grad expansion and got an "initial layer" solution without secular terms. This solution indicates that high-moment sound waves may exist in gases.
ANOMALOUS BEHAVIOUR OF THE LOW TEMPERATURE PHONON CONDUCTIVITY OF AN FeMnAl ALLOY
Authors: YAN SHOU-SHENG  , GAO LI-MING  , WAN JUN-ZUO  , PENG ZHENG-WEI  , YING ZHI-QIANG  ,   北京大学物理系
Published: November 2020

Measurements have been made at 4.2-30 K for the thermal conductivity of a poly-crystalline Fe-25Mn-5Al-0.2C sample with negative temperature coefficient of resistivity. It is found that the phonon conductivity is anomalously proportional to T. The suggested explanation is that this phenomenon results from the noneffectiveness of the scattering of phonons by electrons, when electrons have short mean free path caused by addition of Al.
THE MICROWAVE-RADIO FREQUENCY MULTI-QUANTUM TRANSITION IN OPTICAL PUMPING EXPERIMENT (CONTINUED)
Authors: LIU SHU-QIN  , DONG tAI-QIAN  ,   北京大学
Published: November 2020

The microwave-radio frequency multi-quantum transition in optical pumping experiment is studied for different r.f. power. The microwave-r.f. subharmonic multi-quantum trasition has also been observed.
A QUANTUM-STATISTICAL THREE-LEVEL CASCADE JAYNES-CUMMINGS MODEL
Authors: LI XIAO-SHEN  ,   江西师范大学物理系
Published: November 2020

A quantum-statistical model for a three-level cascade atom interacting with radiation fields initially in coherent states is presented. By means of numerical summation and saddle-point approximation, the expectation values of the atomic-level operators and the photon numbers are obtained and discussed, which reveals the phenomena such -as the twophoton transitions and the new collapse and revival.
THE ELECTRON CORRELATION FUNCTION OF AI SURFACE
Authors: FENG WEI-GUO  , SUN XIN  ,   复旦大学物理系
Published: November 2020

The integral equation for the inhomogeneous electron correlation function is established on the basis of the many-body wave function of metal surface, and the divergent terms in this equation caused by the long-range correlation are eliminated. Then we get the numerical results of the correlation function for Al surface in the first iteration.
OBSERVATIONS ON HIGH TEMPERATURE CREEP PROCESSES OF A NICKEL BASE ALLOY BY TRANSMISSION ELECTRON MICROSCOPY
Authors: KONG QING-PING  , ANG XIANG  , NI QUN-HUI  ,   中国科学院固体物理研究所
Published: November 2020

On the basis of the previous paper [1], dislocation structures in the primary and secondary stages of high temperature creep of a nickel base alloy (Ni80Cr20Ti) have been studied by transmission electron microscopy. The observations and analyses have been emphasized on the primary stage. It is shown that, in the primary stage of high temperature creep, a large number of individual dislocations are formed. They generally do not lie on the slip planes. The majority of them are shown to be mixed type dislocations. It is concluded that such kind of dislocations is a product of the combination of climbring of edge dislotions and cross slipping of screw dislocations.
STOCHASTIC TRANSPORT PROCESSES OF CARRIERS IN AMORPHOUS SEMICONDUCTOR SUPERLATTICES
Authors: XIONG SHI-JIE  ,   南京大学固体物理研究所
Published: November 2020

In order to investigate the transport processes of carriers in the amorphous semiconductor superlattices, we have proposed and rigorously solved the continuous-time random walk model in the form of superlattice for the migration of carriers. Being based upon this, the generalized form of the Pick's law in these materials has been obtained, and the mobility of carriers, varying with the frequency and the modulation wavelength, has been calculated for the Gaussian and non-Gaussian time-distribution functions respectively. It has been shown that the long-time-tail behaviour (for the non-Gaussian distribution) may partly cancel the size-effect due to the structural modulation.
CALCULATION FOR ELECTRON CORRELATIONS IN EXCITED STATES OF THE LITHIUM
Authors: LI BAI-WEN  , LI MING-SHENG  ,   中国科学院武汉物理研究所
Published: November 2020

A variational method proposed by Wilets et al. is used to calculate the eigenvalues and eigenfunctions for the (ls)22p2P, (ls)23s2S, (ls)23p2P, (ls)23d2D and (ls)24f2F states of the lithium. The results are compared with those obtained from Hartree-Fock method, CI method and 1/Z expansion method.
MECHANISM OF HIGHLY COERCIVITY ON EPITAXIAL Co-FERRITES
Authors: Du You-wei  , Lu Huai-xian  , Wang Ting-xiang  , Xue Rong-hua  , Cheng Liang  , Hu Hong-quan  ,   (1)南京大学固体物理研究所; (2)南京大学物理系
Published: November 2020

The particles of Zn0.2Fe2.8O4, ferrite are prepared by chemical Co-precipitation. The shape of particles are nearly spherical and their mean diameter is about 300?. Epitaxial cobalt ferrite layer is coated on their surface. Coercivity Hc and ferromagnetic resonance line width △H are measured. According to, experimental results, the effective mangnetic anisotropy constant Ku is about 5×105 erg/cm2. That is induced by interface interaction between the inner core of Zn0.2Fe2.8O4 and Co-Fe epitaxial layer. The distance of interaction is about the total thickness of two oxygen ion layers.
ELECTRONIC IMPACT EXCITATION CROSS SECTIONS AND RATES (I)——SPIN ALLOWED EXCITATION PROCESSES
Authors: TIAN BO-GANG  , LI JIA-MING  ,   (1)中国科学院物理研究所; (2)中国科学院物理研究所,中国科学院化学研究所
Published: November 2020

Based on two properties of the generalized oscillator strength densities: (1) continuity in an excitation channel and (2) quasiscaling relation along an isoelectronic sequence, the corresponding parameters in the Bethe's formula (namely the Bethe's physical parameter set) have similar behaviors. According to the Bethe's formula, excitation cross sections for spin allowed processes can be easily calculated in terms of the Bethe 's physical parameter set which characterizes the excitations of target atoms. In the present article, we introduce corrected functions defined as the ratios between the exact cross sections and the Bethe's cross sections. The corrected functions reveal a nice universal scaling feature within 50%. Thus, various cross sections as well as rates, which correspond to electron impact excitations from an initial state to infinite final states-forming a so called "excitation channel", can be obtained conveniently.
THE PSEUDO-SYMMETRY IN THE LOW SYMMETRY CRYSTAL SYSTEMS
Authors: ZHENG QI-TAI  ,   中国科学院生物物理研究所
Published: November 2020

The pseudo-symmetry often occurs in the crystal structures. The types of pseudo-symmetry may be classified into three categories, i.e. enantiomorphous, translational and those based on other symmetry elements. The present paper discussed some possible translational types in detail, and derived the elements of the pseudo-symmetry for the low symmetry crystal systems (74 space groups). A number of examples show that the pseudo-symmetry is universally exist. Finally, the compatibility between the pseu-do and inberent symmetry groups is also discussed.
A STUDY ON STRUCTURE OF AMORPHOUS FAST IONIC CONDUCTOR IN SYSTEM LiF-LiCl-B2O3
Authors: CUI WAN-QIU  , ZHANG JIAN  , YUAN PING  , WANG GUO-MEI  , YUN HUAI-SHUN  ,   武汉建筑材料工业学院
Published: November 2020

The structure and ionic conduction of glasses in system LiF-LiCI-B2O3, especially the role of F- ion in network of glasses and the influence of F-, Cl-, Li+ ions on conductivity have been studied by B-NMR and infrared spectra. For glasses in system LiF-LiCl-B2O3, the boron changes from triangular [BO3] to tetrahedron [BO3F] configuration with increasing LiF content, and F- ion participates in network formation. Therefore the network of glasees expands layer into space, and the glasses form three-dimensional network structure containing [BO3F] unit. The Cl- ion exists in network in a state separated from network and plays the role of loosening network, so that it is effective for conductivity. The Li+ ion is the conductive phase, it gives the major contribution to conductivity. The ionic conductivity of glasses in this system increases with increasing LiF and LiCl content, and is 6.12×10-4Ω-1·cm-1 at 300℃.
THE EXCHANGE SYMMETRY IN THE MOLECULAR VIBRATIONS
Authors: GU GUO-LIANG  , TAO RUI-BAO  ,   (1)复旦大学物理系; (2)中国科学院理论物理研究所
Published: November 2020

The cause of some accidental degeneracy in the molecular vibrations is discussed. We pointout that the accidental degeneracy would become a natural one under an extended " exchangepoint group". A method for treating such non-unitary symmetry is also suggested.
THE EXPERIMENT AND STATISTICAL MODEL OF FERRO-PARAELECTRIC DIFFUSE PHASE TRANSITION
Authors: WANG HONG  , XU YU-HUAN  ,   中山大学物理系
Published: November 2020

A DPT ferroelectric ceramics system of (Ba1-xLax)(Ti1-yZry)O3 and a DPT-SPT ferroelectric crystal serise of K0.2Na0.2(SrpBa1-p)0.8Nb2O6 have beenprepared by the ordinary ceramics manufacture technique and Czochralski technique respectively. The curves of dielectric constant vs. temperature of all samples have been measured. The semi-quantitive point-analyses of composition distribution have been obtained by the technique of SBM and EDAX. The inhomogeneity of composition distribution was discovered in both DPT ceramicses and DPT single crystal, but in SPT crystal no such fluctuation was found. It was shown that the diffuse curves of ε(T) is related to composition fluctuation directly. Therefore the Smolensky's composition fluctuation model for DPT was proved in experiment. According to this model, there is a statistical distribution of transition temperature, inside the DPT ferroelectrics. The theoretical calculation of dielectric constant with the change of temperature of all samples were done by using two different expressions of ε′(T, Tc). The theoretical results agree well with experimental curves.
STUDY ON IONIC CONDUCTORS IN PSEUDO-BINARY SYSTEM LiNaSO4-MgS04
Authors: WANG CHAO-YING  , FU ZHENG-MIN  , CHEN LI-QUAN  ,   中国科学院物理研究所
Published: November 2020

The phase diagram of pseudo-binary system LiNaS04-MgSO4 system has been studied by means of DTA and X-ray diffraction technique. Three compounds (LiNa)0.8Mg0.20.8·Mg0.2 SO4 (LiNa)0.67Mg0.33 SO4 and (LiNa)0.4 Mg0.6 SO4 have been found in this system.The ionic conductions in these three compounds have been investigated. The ionic conductivities at 490℃ are 6.1×10-5S ·cm-1, 6.5×10-5S·cm-1 and 9.8×10-6S·cm-1 with activa tion energies 1.67 eV, 1.48 eV and 1.32 eV, respectively. The prototype high temperature thermal batteries Mg/MnO2 using these compounds respectively as electrolyte have been made and tested. The results show that, Mg/ (LiNa)0.8Mg0.2 SO4/MnO2 cell has better Polarization and discharg behaviour than the others. Hence (LiNa)0.8Mg0.2SO4 might be used as electrolyte in high temperature thermal battery.
TIME-DEPENDENT PROBLEM OF FOKKER-PLANCK EQUATION OF MANY VARIABLES WITH A MULTI-STABLE POTENTIAL
Authors: HU GANG  , WANG SHENG-GUI  ,   (1)北京师范大学物理系; (2)九江师范专科学校物理科
Published: November 2020

The two-box Schl?gl model is analysed. The Ω-expansion of the Green function is applied to such model, and then the time-dependent problem of Fokker-Planck equation of many variables with a multi-stable potential is solved cm the basis of the approximation of the leaoling order of the system size.
GRATING IMAGING AND LAU EFFECT
Authors: WU YI-XIU  , LIN YI-MING  ,   (1)南京大学物理系; (2)南京化工学院数学教研组
Published: November 2020

The optical intensity distribution of a generalized two-grating interferometer is derived in this paper. The influence of ratio of grating period to slit width on Lau fringesis analyzed. We show that the clear Lau fringes for β>p/(2a) do exist and their existe-nce is verified by experiment and numerical calculations.
MEAN-SQUARE DISPLACEMENTS OF ATOMS IN A SEMI-INFINITE SUPERLATTICE
Authors: XING DING-YU  , YUAN JIAN  ,   (1)南京大学固体物理研究所; (2)南京大学物理系
Published: November 2020

On the basis of a simple model of a simple cubic crystal and by using the Green's function method, calculations are carried out on the mean-square displacements of atoms in a semi-infinite superlattice. The effect of surface and interfaces on lattice vibra-tion are discussed.
THEORETICAL INTERPRETATION OF RESONANCE RAMAN SCATTERING IN cis-POLYACETYLENE
Authors: GUO YOU-JIANG  , YU LU  ,   (1)中国科学院理论物理研究所; (2)中国科学院物理研究所
Published: November 2020

A bipolaron microscopic model is proposed in this paper to interpret theoretically the Raman scattering data in cis-polyacetylene on the basis of lattice relaxation theory. The coupling of electron to different phonon modes is taken into account, the coupling constants being determined from the infrared and the Raman data. The theoretical results thus obtained are compared with the experimental data and discussed. The method used in this paper can be generalized to other similar systems.
EXACT CONTINUUM MODEL FOR POLYACETYLENE
Authors: WU ZI-YU  , WANG KE-LIN  ,   中国科学技术大学基础物理中心
Published: November 2020

On the basis of the continuum version of the SSH Hamiltonian, we obtain a set of equations for the electronic wave function, which reduces to the BdG equations in the TLM model with neglect of certain terms. The new set of equations has been solved rigorously and analytically with the solution reducing to SSH's simple kink function in the zeroth approximation.
ULTRAFINE POWDERS PRODUCED BY U-V LASER PHOTOLYS OF IRON PENTACARBONYL
Authors: LIN JIN-GU  , SU YANG  , SHAN JUN  , YANG JUN-HUI  , FU KE-JIAN  ,   中国科学院物理研究所
Published: November 2020

Photodissociation of Fe(CO)5 have been achieved using U-V laser as the photolysis source, A middle- energy U-V laser pulse (～20 mJ/pulse) is directed into a specially designed gas cell which typically contains 10-20 Torr of Fe(CO)5. We have obtained some ultrafine powders from U-V laser photolys of lron-pentacarbonyl in gas cell. Through the analysis of products by using modern physical instruments, we identify that the resulting powders are iron oxide, ironcarbide; they also contain a little crystalline state of iron or carbon and oxygen. The particles in the powders are uniform in size (300-400 ?) and have catalytical activity. At appropriate laser power densities, U-V laser photodecomposition of Fe(CO)5 has also-achieved to produce Fe film on the window of the gas cell. The film composition was examined by X-ray fluorescence.
V-V ENERGY TRANSFER IN DISSOCIATION PROCESS OF FREON 113 MOLECULES IN MULTIFREQUENCY INTENSE IR LASER FIELDS
Authors: YANG LI-SHU  , WANG ZHENG-MIN  , WU CHUAN-XIU  , LIU ZONG-CAI  , GE LI-HE  ,   中国科学院安徽光学精密机械研究所
Published: November 2020

Freon 113 molecules are superexited in multifrequency intense IR laser fields composed of 9P(24), 9P(22), 9P(20), 9P(18) lines of TEA CO2 laser, reaching very high exited states. It can be seen from the decomposition curve that a "siphonage effect" exists obviously in the V-V energy transfer between CF2C1·CFC12 and CF3·CCl3 molecules. From the main products C2F6, C2Cl6, C2F4 and C2F2C12, it is shown that the C-C bonds having higher energy in CF2Cl·CFCl2 and CF3·CCl3 were mostly broken, but only a few C-Cl bands having lowest energy ruptured. We propose a dissociation mechanism of Freon 113 molecule in multifrequency intense IR fields, and indicate that intramolecular V-V energy transfer is not randomized.
PHASE RELATIONSHIP AND ELECTRICAL CONDUCTIVITY OF Li1+xGe2-xAlxP3O12 SYSTEM
Authors: LI SHI-CHUN  , CAI JIAN-YI  , LIN ZU-XIANG  ,   中国科学院上海硅酸盐研究所
Published: November 2020

Phase relationship and electrical conductivity of the system Li1+xGe2-xAlxP3O12 were studied.A good host compound LiGe2P3O12 was found. Solid solution with R3c structure can be formed in the range 04+ with Al3+ in LiGe2P3O12, and then an unknown phase appeared at x>0.6. The conductivity increased rapidly when Ge4+ was substituted by a small amount of Al3+(x=0.1). The conductivity increased with the increase of content of A13+ and reached a maximum at x = 0.5. The conductivities of Li1.5Ge1.5Al0.5P3O12 equal to 3.5×10-5, 1×l0-2 and 3.1×10-2 S cm-1 at room temperature, 300℃ and 450℃ respectivily. Activation energy of conduction is 0.33 eV, electron transfer number is about 10-5.
NON-EQUILIBRIUM DISTRIBUTION OF THE POPULATION OF ALKALI ATOMS IN THE GROUND STATE INDUCED BY LASER-MW DOUBLE RESONANCES
Authors: CHEN XIAO-YUAN  , ZHU XI-WEN  ,   中国科学院武汉物理研究所
Published: November 2020

We obtained the conditions under which the maximum non-equilibrium distribution of the population of alkali atoms in the ground state in atomic beam pumped by laser-MW double resonance is achieved. These conditions are consistent with recent experiments. We examined the processes which affect the realization of the non-equilibrium distribution of population, and indicated the methods of eliminating the effects of these processes. The features of pumping processes with laser-MW double resonances are discussed, and compared with the two laser pumping process.
THE INFLUENCE OF LASER FREQUENCY BANDWIDTH ON THE TIME AND SPACE STRUCTURES OF THE 2ω0 HARMONIC GENERATION
Authors: TAN WEI-HAN  , LIN ZUN-QI  , GU MIN  , SHI A-YING  , YU WEN-YAN  , DENG XI-MING  ,   中国科学院上海光学精密机械研究所
Published: November 2020

Reported here are the 2ω0 harmonic space and time structures taken by streak camera in the direction of 90°with the laser optical axis. The evident differences, as shown between the broadband and narrowband laser shooting, are analyzed based on the theory of plasma soliton generation. The results obtained are consistent with the experiments on the whole.
RESPONSE OF HALF-INTEGER QUADRUPOLAR NUCLEAR TO COMB-PULSE IN SOLID STATE NMR
Authors: LI GENG-YING  , WANG DONG-SHENG  , WU XUE-WEN  ,   华东师范大学物理系
Published: November 2020

The comb-pulse response of a system of half-integer quadruplar nuclei depends on the quadrupolar coupling constant ωq. When the average rf field strength ωe (in rad. s-1) satisfies the condition ωq/ωee/(2π); and when ωq/ωe > 2.0, the resul tant line appears at 2ωe/(2π). Theoretical calculations are in agreement with experiments.These consequences indicate that the comb-pulse sequence will probably become a powerful technique for investigating phase transitions and dynamic processes in these systems.
THE EFFECT OF HYDROGEN IMPLANTATION ON ELECTRON IRRADIATED DEFECTS AND BLISTER FORMATION IN SILICON SINGLE CRYSTAL
Authors: GAO YU-ZUN  , S. OHNUKI  , H. TAKAHASHI  , Y. SATO  , T. TAKEYAMA  ,   (1)北京有色金属研究总院; (2)日本北海道大学金属研究所
Published: November 2020

The B-doped (100) CZ-Si single crystal films were implanted with 50 and 100 keV hydrogen ions in the concentration range of 1015-1017H+/cm2. The implanted specimens were electron irradiated at l000keV in HU-1300 HVEM. It was found that the electron irradiated defect density was higher ia Si with no hydrogen than in hydrogen implanted Si at the same irradiation condition within the temperature range 298-573 K. When hydrogen implanted Si films were heated insitu in HVEM from room temperature to 823 K, The hydrogen blisters were formed in k at about 473 K. The critical hydrogen concentration in Si for the formation of blister was 9×1016 H+/cm2. Hydrogen blisters had the form of convex lens with diameter 1000-5000 nm. The blister number density was about 1017/m2 in the 1017H+/cm2 implanted Si The formation of blister is related with the dissosiation of silicon-hydrogen bond in Si.
A1, T2 SYMMETRIC DEEP LEVEL WAVE FUNCTIONS IN 3c-SiC
Authors: FAN XI-QING  , ZHANG DE-XUAN  , SHEN SAN-GUO  ,   郑州大学物理系
Published: November 2020

Numerical results of A1, T2 Symmetric sp3 bonded deep level wave function in 3c-SiC are obtained Using the Koster-Slater Green's function method developed in reference [1-4]. The wavefunction change with the energy of the defect and occupation probability on 0,1,2,...8 shells around the defect are predicted. The constant of hyperfine structure for 3c-SiC:B are calculated and compared with experimental data.
NEW LOCALIZED ELECTRONIC STATE OF POLARON IN POLYACETYLENE
Authors: XING BIAO  , SUN XIN  ,   (1)复旦大学物理系,华中工学院物理系; (2)中国科学院上海技术物理研究所红外物理开放研究实验室
Published: November 2020

We have studied the energy spectra of polaron in SSH model by using a selfconsistent ap-proach. Four new localized electronic state are discovered. They form four discrete levels outside the conduction and valence bands: one locates near the battom of the conduction band and one near the top of conduction bunt, another two are symmetrically near the valence band. Those at the bottom of conduction band and top of valence band only exist in the limited range of coupling constant λ.
SIMULTANEOUS PHOTON-ELECTRON EXCITATIONS OF HYDROGEN
Authors: CHEN BAO-ZHEN  ,   北京师范大学低能核物理研究所
Published: November 2020

In this article, the second order perturbation theory is used to obtain the expression of T-matrix for the Simultaneous photon-electron excitations of hydrogen. The convergence and resonance of the T-matrix are discussed in brief.
NONLINEAR GUIDED WAVE IN ASYMMETRIC KERR-TYPE DIELECTRIC FILM LEAKY WAVEGUIDE
Authors: WANG QI  , XUE BING-ZHANG  , CAI YING-SHI  ,   上海科学技术大学物理系
Published: November 2020

The propagation characteristics of TE0 modes is studied in an asymmetric leaky waveguide of Kerr-type dielectric film under certain boundary condition. Our result shows that steady guided wave cannor exist if the film thickness is greater than a critical value, and two TE0 modes with different wave numbers may exist if the film thickness is less than that critical value. The propagating powers and the positions of the field amplitude peaks of these two modes in the film vary quite differently when the film thickness or the wave frequency changes. The dispersion relations of these two modes are also different. In the limit of symmetric structure, the dispersion of the weaker TE0 mode is zero.
A signature of tumor DNA repair genes associated with the prognosis of surgically-resected lung adenocarcinoma
Authors: Yang Xiongtao , Wang Guohui , Gu Runchuan , Xu Xiaohong , Zhu Guangying
Published: November 2020

Background

Lung cancer has the highest morbidity and mortality of cancers worldwide. Lung adenocarcinoma (LUAD) is the most common pathological subtype of lung cancer and surgery is its most common treatment. The dysregulated expression of DNA repair genes is found in a variety of cancers and has been shown to affect the origin and progression of these diseases. However, the function of DNA repair genes in surgically-treated LUAD is unclear.

Methods

We sought to determine the association between the signature of DNA repair genes for patients with surgical LUAD and their overall prognosis. We obtained gene expression data and corresponding clinical information of LUAD from The Cancer Genome Atlas (TCGA) database. The differently expressed DNA repair genes of surgically-treated LUAD and normal tissues were identified using the Wilcoxon rank-sum test. We used uni- and multivariate Cox regression analyses to shrink the aberrantly expressed genes, which were then used to construct the prognostic signature and the risk score formula associated with the independent prognosis of surgically-treated LUAD. We used Kaplan–Meier and Cox hazard ratio analyses to confirm the diagnostic and prognostic roles. Two validation sets (GSE31210 and GSE37745) were downloaded from the Gene Expression Omnibus (GEO) and were used to externally verify the prognostic value of the signature. OSluca online database verifies the hazard ratio for the DNA repair genes by which the signature was constructed. We investigated the correlation between the signature of the DNA repair genes and the clinical parameters. The potential molecular mechanisms and pathways of the prognostic signature were explored using Gene Set Enrichment Analysis (GSEA).

Results

We determined the prognostic signature based on six DNA repair genes (PLK1, FOXM1, PTTG1, CCNO, HIST3H2A, and BLM) and calculated the risk score based on this formula. Patients with surgically-treated LUAD were divided into high-risk and low-risk groups according to the median risk score. The high-risk group showed poorer overall survival than the low-risk group; the signature was used as an independent prognostic indicator and had a greater prognostic value in surgically-treated LUAD. The prognostic value was replicated in GSE31210 and GSE37745. OSluca online database analysis shows that six DNA repair genes were associated with poor prognosis in most lung cancer datasets. The prognostic signature risk score correlated with the pathological stage and smoking status in surgically-treated LUAD. The GSEA of the risk signature in high-risk patients showed pathways associated with the cell cycle, oocyte meiosis, mismatch repair, homologous recombination, and nucleotide excision repair.

Conclusions

A six-DNA repair gene signature was determined using TCGA data mining and GEO data verification. The gene signature may serve as a novel prognostic biomarker and therapeutic target for surgically-treated LUAD.
Characteristics and outcomes of hemodialysis patients with COVID-19: a retrospective single center study
Authors: Luo Yongwen , Li Junli , Liu Zhifen , Yu Heping , Peng Xiang , Cao Cheng’an
Published: November 2020

Background

The coronavirus 19 (COVID-19) pandemic has heightened the threat to the health and lives of patients with comorbid diseases. Infection by COVID-19 is especially detrimental to patients on hemodialysis. In this study, we evaluated the clinical characteristics, laboratory findings, treatments and prognoses of hemodialysis patients with COVID-19.

Methods

A total of 16 hemodialysis patients with COVID-19 were recruited from Wuhan Fourth Hospital from 5 February to 20 March 2020 for a retrospective, single-center study. A total of 62 non-dialysis patients with COVID-19 were the control group. We collected data on the clinical characteristics, laboratory findings, treatments, and clinical outcomes of patients affected by the virus.

Results

Hemodialysis patients with COVID-19 had a lower incidence of fever (P = 0.001) and relatively higher incidence of pre-admission comorbidities and shortness of breath than non-dialysis patients with COVID-19 (75% vs. 61%, P = 0.467 50% vs. 33.87%, P = 0.248 ). Hemodialysis patients had lower levels of hemoglobin (P < 0.001), white blood cell counts (P = 0.015), neutrophils (P = 0.016), AST (P = 0.037), ALT (P < 0.001) and procalcitonin (P < 0.001), and higher levels of D-dimer (P < 0.001) and thrombin time (P < 0.001). Hemodialysis patients had a higher incidence of pulmonary effusion, cord-like high-density shadows, pleural thickening, and atelectasis (P < 0.05). Hemodialysis patients also had relatively higher rates of mortality and prolonged hospital stays compared with the control group.

Conclusions

Hemodialysis patients typically present with multiple comorbidities and are considered to be a high-risk group for COVID-19 infections. Hemodialysis patients with COVID-19 may have prolonged hospital stays and unfavorable prognoses and should be closely monitored.
Models Establishment for Predicting Interaction between Tillage Practices and Some Selected Engineering Properties of Cassava (Manihot esculenta) Tubers
Authors: Adetola O. A. , Olukunle O. J. , Olalusi A. P. , Olubanjo O. O.
Published: November 2020

Enough technical data on the physical and mechanical properties of tubers are needed for machine design and crop parameters in modeling and designing cassava processing. The main objective of this study was to establish models for forecasting interaction between the tillage practices and some physical and mechanical properties of cassava tubers. Eight tillage practices have been used and are coded in alphabets such as, ploughing + harrowing (A); ploughing + harrowing + ridging (B); manual ridging (C); flat manual clearing (D); ploughing + harrowing + manual digging to a depth of 30 cm + 10 cm of saw-dust placed at the base (E); ploughing + harrowing + ridging +10 cm of saw-dust placed at the base (F); manual ridging + 10 cm of saw-dust placed at the base (G) and manual digging to a depth of 30 cm + 10 cm of saw-dust placed at the base (H). The experiment was conducted in TME (Tropical Manihot esculenta) 419 with two soil conditions using recommended nutrient dosage. The experimental design was split-split plot design with three replications. The physical and mechanical properties of cassava were determined 10 months after planting using standard equations and methods. Statistical Package for Social Science window 21 versions was used for data analysis. Models were developed using Linear Regression. Manual Ridging + 10 cm Sawdust placed at the base + TME 419 + Rainfed + 933.75 kg/ha of NPK 15:15:15 fertilizer tillage practice gave the highest yield of 15.02 tons/ha with uniform physical and mechanical properties. The model equations revealed that tillage had positive impact on the selected physical and mechanical properties of cassava tubers such as length, width, thickness, size, aspect ratio, surface area, sphericity, roundness, unit mass, unit volume, true density, bulk mass, bulk volume, bulk density, porosity, angle of repose, coefficient of static friction, compressive extension at break, compressive strain at break, compressive load at break, compressive stress at break, energy at break, modulus automatic, compressive load at yield, compressive extension at yield, and compressive strain at yield and compressive stress Models developed could be used by engineers in designing improved equipment and machineries for harvesting and processing of cassava tubers into useful products.
Genetic Variability and Association of Morpho-physiological Traits in Bread Wheat (Triticum aestivum L.)
Authors: Kumar Puneet , Solanki Y. P. S. , Singh Vikram , Kiran .
Published: November 2020

The experiment was conducted with 60 genotypes of bread wheat. These genotypes were grown in RBD using three replications during Rabi 2016-17 at Research Area of Wheat and Barley Section, Department of Genetics and Plant Breeding, CCS HAU, Hisar. To study the variability, correlation and path analysis, data were recorded for yield and its component traits i.e. days to 50% heading, days to anthesis, grain growth rate at 14, 21, 28 days (mg/g/day), plant height (cm), number of effective tillers/meter, flag leaf length (cm), flag leaf width (cm), flag leaf area (cm2), spike length (cm), number of spikelets per spike, number of grains per spike, 1000 grain weight (g), grain yield per plot (g), biological yield/plot (g) and harvest index (%). ANOVA showed highly significant differences among the genotypes for all the traits indicating adequacy of material and the traits studied for further assessment of genetic variability parameters. High value of GCV and PCV was recorded for grain yield per plot, followed by biological yield, indicating greater amount of variability among the genotypes. Highest heritability was recorded for days to 50% heading, followed by days to anthesis. Highly significant and positive association was perceived between grain yield and tillers per meter, plant height, number of grains per spike, number of spikelets per spike, flag leaf area, grain growth rate at 14, 21 and 28 days after anthesis, spike length, 1000 grain weight, biological yield and harvest index. The high direct effects were recorded for biological yield, harvest index, flag leaf breadth, number of effective tillers per meter and 1000 grain weight, in order.
Pythium Soft Rot Management in Ginger (Zingiber officinale Roscoe) – A Review
Authors: Behera Sunita , Sial Parshuram , Das Himangshu , Pradhan Kedareswar
Published: November 2020

Ginger crop is affected by various diseases. Among them rhizome/soft rot is the most damaging one and main production constraint in ginger growing areas. This disease is mainly caused by the Pythium spp. along with association of some others micro-organisms. The severity of Pythium soft rot disease is influenced by different factors related to seed, environment and soil. This study was focused on Pythium soft rot of ginger with special reference to different management strategies. Different cultural measures viz. seed rhizome treatment before storage and sowing, selection of disease free seed rhizome, sowing time, application of soil amendments, good drainage of soil, soil solarization etc. are the important measures for management of ginger soft rot. Seed treatment and soil drenching are the two options of chemical control of soft rot. Seed rhizomes treated with fungicides azoxystrobin 25%, tebuconazole 25.9%, copper oxychloride 50%, carbendazim 50%, propiconazole 25%, metalaxyl-M 4% + mancozeb 64%, metiram 55% + pyraclostrobin 5%, carbendazim 12% + mancozeb 63%, tebuconazole 25% + trifloxystrobin 25% and metalaxyl 8% + mancozeb 64% resulted in effective management. Different fungicide formulations viz. carbendazim 50%, copper oxychloride 50%, metalaxyl-M 4% + mancozeb 64%, metiram 55% + pyraclostrobin 5%, carbendazim 12% + mancozeb 63%, tebuconazole 25% + trifloxystrobin 25% etc. found effective for spraying. Seed treatment and application of Trichoderma spp. found suitable for effective biological management.
Socio Economic Status of Cabbage Growers in Khandwa District of Madhya Pradesh
Authors: Rathod B. S. , Narvariya R. K. , Shrivastava A.
Published: November 2020

A study was conducted in 2016-17 for socioeconomic study of cabbage producing farmers in Khandwa district of Madhya Pradesh. Block Pandhana district of Khandwa (M.P.) was purposively selected for the study because of its potentiality on vegetable production. A sample of 60 farmers in the ratio of 20:20:20 was selected randomly. Primary data was collected using interview schedule, direct observation, focus group discussion, key informant interview whereas secondary data was collected from various web reviews, publications and reports of different governmental as well as non-governmental agencies. This indicated that in the study area agriculture farming is basically in the hand of the farmers mostly belonged to backward classes and a few also belonged to general category. It was due to fact that elder farmers fragmented their holding into holdings due to distribution of land among the spouses. It is also apparent that (16.66%) of the cabbage growers were illiterate and got only formal education. The average size of operational land holdings of selected farmers was 1.35 hectare, 3.2 hectare and 6.6 hectare on small, medium and large size farms respectively. The entire land was owned and operated by selected farmers and none have leased out or leased in land for cultivation. Small size farm higher human labour days were a result of sufficient availability of family labour. The entire land was owned and operated by selected farmers and none have leased out or leased in land for cultivation. The average net sown area of small, medium and large size farm was 1.28, 3.04 and 6.27 hectare respectively. Almost entire land holdings were well irrigated. On the basis of above observation it may be conclude that on small size farm higher human labour days was a result of sufficient availability of family labour.
Plasma Growth Differentiation Factor-15 as a Prognostic Biomarker in Children with Congestive Heart Failure
Authors: Khayal Abrar Mohamed , Nemr Shimaa Basyoni El- , Serogy Hesham Ahmed El- , Zoair Amr Mohamed
Published: November 2020

Aim and Objectives: This study aimed to evaluate the plasma levels of Growth Differentiation Factor-15 (GDF-15) in children with congestive heart failure, also to evaluate the diagnostic and prognostic value of this novel biomarker in pediatric congestive heart failure, by correlation of its levels with the clinical status and the echocardiographic data of these patients.

Subjects and Methods: This study was conducted on Thirty (30) children with congestive heart failure (CHF), Patients were selected from those admitted to Pediatric Cardiology Unit, Pediatric Department, Tanta University Hospital, from (August 2018-April 2020), and thirty (30) healthy children, matched for age and sex, were enrolled as a control group. All children in this study were subjected to Plain X-ray chest and heart: Cardiothoracic ratio (CTR) was measured, and Echocardiographic assessment: Doppler and Two-dimensional, M-mode Echocardiographic evaluation of these parameters and Plasma level of Growth Differentiation Factor-15 (GDF-15) was measured.  

Results: the results revealed that The best cutoff point of GDF-15 to differentiate between cases with CHF and control group was >446.5 ng/l with 93.33% sensitivity, 90% specificity, 90.3% PPV, 93.1% NPV and AUC was 0.992.

There was significant decrease of EF% and FS% (systolic dysfunction of LV) in patients with CHF as compared to control group.

There was statistically significant positive correlation between plasma level of GDF-15 and Ross clinical stage of CHF.

There was statistically significant negative correlation between GDF-15 and EF%, FS % by echocardiography.

Conclusion: Plasma levels of GDF-15 were elevated in children with CHF, and these levels were correlated to the Ross staging of CHF and echocardiographic assessment of LV function. Plasma levels of GDF-15 were elevated in patients with bad prognosis, denoting its prognostic value as a novel biomarker in pediatric CHF.
Design of Fundamental Power Coupler of 5 Cell Elliptical SRF Cavity Using CST Microwave Studio
Authors: Das Rajdip , Biswas B. N.
Published: November 2020

A 5 cell elliptical cavity prototype has been build to accelerate the 100 MeV high beam of protons [1]. For cavity = 0.61 β g at 650 MHz in which the cavity structure is optimized by using the code from SUPERFISH [2]. The Q value of the cavity measured is 0.61x109 for 4.2 K. In the frequency range 2 – 5 GHz with CST MICROWAVE STUDIO [3]. It has been designed taking into account the advantages of both the waveguide type and coaxial type coupler This paper explains the current design of the cavity with a different angle of aperture and wall which have better mechanical stability and flatness, consisting of facilities for surface processing and less loss of beam. In this paper, the fundamental power coupler of a 5-cell 650MHz elliptical SRF cavity has been designed using CST MICROWAVE STUDIO. Here we have considered the ceramic window matching and co-axial to rectangular waveguide matching for the power coupler.
Textile Electronics for VR/AR Applications
Authors: Liu Su , Ma Kitming , Yang Bao , Li Heng , Tao Xiaoming
Published: November 2020

Textile electronics addresses fibers or fiber assemblies with electronic functions to generate, transmit, modulate, and detect electrons. Interactive textile electronic devices may provide suitable platforms for virtual reality (VR)/augmented reality (AR) applications because of their excellent performance and unique immersive features such as lightweight, handiness, flexibility, comfort, and low strain even under high deformations. This paper presents a systematic review of the literature on the state‐of‐the‐art of interactive devices, fabrication technologies, system integration, promising applications, and challenges involved in textile‐based VR/AR systems.
Reconfigurable Optical Magnetometer for Static and Dynamic Fields
Authors: Chatterjee Kalipada , Pal Sushanta Kumar , Jha Rajan
Published: November 2020

Optical magnetometers with high resolution, integrability, and reconfigurability have been central to the development of advance photonic devices for remote and efficient magnetic field sensing. These magnetometers have mostly been based on ferromagnetic materials that detect only static magnetic fields. Here, the limitation is overcome by utilizing an interferometric technique to demonstrate a reconfigurable fiber‐based magnetometer that is highly sensitive to both static and dynamic magnetic fields. The proposed sensor shows an unprecedented sensitivity of 37.07 nm/mT for static magnetic field that could enable detection of few nanotesla fields with a high‐resolution optical spectrometer. Furthermore, the proposed magnetometer has wide dynamic range extending over a frequency band of 0–1700 Hz with significant signal to noise ratio (16.04 dBm at 615 Hz) that enables precise frequency determination of the signal. The large reconfigurability, dynamic operation frequency, and portability of the demonstrated magnetometer ascertain practical applications in broad range of technologies including cardiovascular health monitoring, underground mineral exploration, and marine surveillance.