bluuebunny/crossref_metadata_2025 huggingface dataset:
Kærlighed i fængsel
Authors: Lottrup Rasmussen Leonora
Published: December 2020

Denne artikel undersøger, hvordan fanger i Horsens Straffeanstalt indgik intime relationer med kvinder under deres afsoning. Artiklen tager sit empirisk udgangspunkt i kildemateriale fra den såkaldte Tugthussag fra 1883, der omhandlede et illegalt netværk mellem fanger og ansatte i Horsens Straffeanstalt. På baggrund af forhørsprotokoller og kærestebreve, der blev fremlagt som bevismateriale i sagen, sætter ariklen fokus på særligt to fanger, der under afsoning etablerede forhold til fængselspræstens tjenestepiger. Med metodisk afsæt i Michel de Certeaus begreb om hverdagens praksis og klassiske antropologiske teorier om udvekslinger og gavegivning, tematiserer artiklen både spørgsmål om fangeagens og social kontrol i det moderne fængsel.
Den bedste konge - kongen som indbegrebet af dyd
Authors: Egnsbro Sigga
Published: December 2020

Det frankiske Europa var i 900-tallet præget af store omvæltninger for den herskende elite. Et nyt dynasti etablerede sig som det toneangivende og gamle praksisser blev revurderet. Samtidig hermed blomstrede historieskrivningen op i det østfrankiske rige efter fem årtiers pause. I de nye narrativer er omdrejningspunktet individet. Her fremstår moralsk lederskab som centralt, da forfatterne fremstillede de fremmeste magtpersoner ud fra en ramme af dyder og laster. I denne artikel undersøges herskerrepræsentationen i historieskrivningen på baggrund af en central omend negligeret moraltraktat fra 900-tallet. Dermed søges forklaringer på den stigende interesse for dydsetik og indblik i fremherskende dydsforestillinger i 900-tallet.
‘Adulting’ Is Hard: Understanding the College-to-Career Transition and Supporting Young Adults’ Emotional Wellbeing
Authors: Golden Laura , Moser Jade , Vella-Riplee Aimee , MacPhee John , Schwartz Victor , Levin Len , Biebel Kathleen
Published: December 2020

The transition from college to career includes many challenges, such as adjusting to a professional environment, the high costs of student loan repayment and independent living, and changes in social support networks. Many of these challenges affect a young person’s emotional wellbeing; however, limited attention has been paid in the literature or at the practice level to the emotional wellbeing of college graduates as they transition from college to career. To address this underrecognized issue, investigators from The Jed Foundation (JED), a leading nonprofit organization with a mission to protect the emotional health and prevent suicide among teens and young adults, and the Transitions to Adulthood Center for Research (Transitions ACR) at the University of Massachusetts Medical School collaborated on a study to better understand the experiences of young adults during the college-to-career transition and how these experiences effect emotional wellbeing.
Claude-Henri Grignon face à la Révolution tranquille. Les échos de Valdombre1
Authors: Hotte Ghyslain
Published: December 2020

Cet article propose une analyse de la pensée de Claude-Henri Grignon (1894-1976), auteur prolifique et pamphlétaire originaire de Sainte-Adèle (Québec). Si son nom évoque immédiatement son oeuvre littéraire, on connaît moins bien son oeuvre polémique écrite dans le contexte de la Révolution tranquille. En effet, tout au long de la décennie 1960, Grignon livre plusieurs conférences et publie de nombreux articles sur diverses questions sociales. Durant cette période, le traditionaliste Grignon s’oppose aux réformes politiques, institutionnelles et sociales réalisées dans la foulée de la Révolution tranquille. L’historiographie a laissé peu de place aux penseurs dits « contre-révolutionnaires tranquilles ». Ce texte tente de combler cette lacune.
Manual de sobrevivência para divulgar ciência e saúde
Authors: Chagas Catarina , Massarani Luisa
Published: December 2020

Neste livro, as autoras tem como objetivo sensibilizar pesquisadores e futuros pesquisadores (estudantes de pós-graduação e de graduação) sobre a importância de manter um diálogo com a sociedade acerca de temas de ciência, tecnologia e saúde e oferecem ferramentas práticas de como fazer ações de divulgação científica.
The solitary wave approximate solution of strongly nonlinear evolution equations
Authors: Mo Jia-Qi  , Zhang Wei-Jiang  , He Ming  ,   (1)安徽师范大学数学系，芜湖 241000; (2)上海交通大学数学系，上海 200240
Published: December 2020

A strongly nonlinear evolution equation is studied. Using the variational principle, firstly, the corresponding functional is constructed. Next, its Lagrange operator is selected; and then, using the generalized variational iteration method, the approximate solution of arbitrary degree of accuracy for the solitary wave is obtained.
Perturbation of symmetries and Hojman adiabatic invariants of discrete mechanical systems in the phase space
Authors: Zhang Yi  ,   苏州科技学院土木工程系，苏州 215011
Published: December 2020

The perturbation of symmetries and adiabatic invariants of discrete mechanical systems in the phase space are studied. The Hojman exact invariants introduced by the special Lie symmetries of discrete mechanical systems in the phase space without perturbation are given. Based on the definition of high-order adiabatic invariants of a mechanical system in the phase space, the perturbation of Lie symmetries of the system by the action of small disturbance is investigated, and a type of new adiabatic invariants of the system are obtained, which can be called the Hojman adiabatic invariants. An example is given to illustrate the application of the results.
Teleportation of arbitrary three-particle GHZ state using single three-particle maximal GHZ state or two EPR states
Authors: Li Yan-Ling  , Feng Jian  ,   聊城大学物理科学与信息工程学院，聊城 252059;聊城大学光通信研究所，聊城 252059
Published: December 2020

Two schemes, using respectively the single three-particle maximal Greenberger-Horne-Zeilinger (GHZ) state and the two Einstein-Podolsky-Rosen (EPR) states as quantum channels, for deterministic teleportation of arbitrary three-particle GHZ state are proposed. These schemes are also generalized into the case of teleportation of arbitrary n-particle GHZ state (n≥4). The fidelity of teleportation when the quantum channels are affected by noise is discussed. It is found that when using single three-particle GHZ state which is affected by noise as quantum channel, the fidelity of teleportation is only related to the entanglement of the channel. However, when using two EPR states which is affected by noise as quantum channels, the fidelity of teleportation is related to the entanglement of both the channels and the unknown state to be delivered. Compared with previous proposals, our schemes require a reduced number of entangled states as quantum channels to achieve the same task.
The renormalized energy-momentum tensor and Casimir effect of Dirac field in two-dimensional static spacetime
Authors: Liu Cheng-Zhou  , Zhang Chang-Ping  ,   (1)滨州学院物理与电子科学系,滨州 256600; (2)滨州学院物理与电子科学系,滨州 256600；北京师范大学物理系,北京 100875
Published: December 2020

The renormalized energy-momentum tensor and Casimir effect of Dirac field in general asymptotic flat two-dimensional black hole backgrounds with Dirichlet boundary conditions are calculated using the general properties of the renormalized energy-momentum tensor. The general formulas of the renormalized energy-momentum tensor is given and the corresponding Casimir forces in many specific asymptotic flat black hole backgrounds are obtained. The relations of the renormalized energy-momentum tensors and Casimir effect with vacuum，Hawking radiation and trace anomaly are investigated respectively and the corresponding computation results are obtained.
Simulation of a family of multi-folded torus and multi-scroll chaotic attractors
Authors: Wang Fa-Qiang  , Liu Chong-Xin  ,   西安交通大学电气工程学院,西安 710049
Published: December 2020

A new type of multi-folded torus and multi-scroll chaotic generator is studied by constructing a new nonlinear function. With the natural number n increasing, the characteristic of this chaotic system is that it can generate the 2n-folded torus and 2n+1-scroll chaotic attractors which are of the same size and evenly distributed, and the folded torus chaotic attractors alternated with the scroll attractors. The leaftmost and the rightmost of this chaotic system are scroll attractors. Finally, the circuitry is designed and simulated on Electronics Workbench (EWB).
The distribution of a granular pile under impact
Authors: Zhang Hang  , Guo Yun-Bo  , Chen Xiao  , Wang　Duan  , Cheng Peng-Jun  ,   南京大学物理系，南京 210093
Published: December 2020

Granular stream was created with Gaussian horizontal velocity distribution, and the granules pile up when falling on the ground. The ideal model predicts the pile should be Gaussian in shape but certain properties of granular matter can deform this ideal accumulation. After taking these factors into account, the pile surface evolution equation was acquired, and the theoretical prediction accorded with the experimental data very well. Finally, a new approach of mixing granular materials was proposed.
Investigation of analytic potential energy function, harmonic frequency and vibrational levels for the 23Σ+g state of spin-aligned dimer 7Li2
Authors: Shi De-Heng  , Sun Jin-Feng  , Ma Heng  , Zhu Zun-Lue  ,   (1)河南师范大学物理与信息工程学院，新乡 453007; (2)信阳师范学院物理电子工程学院，信阳 464000;河南师范大学物理与信息工程学院，新乡 453007
Published: December 2020

Using the symmetry adapted cluster/symmetry adapted cluster-configuration interaction(SAC/SAC-CI) method in Gaussian03 program package, the equilibrium geometry of the 23Σ+g state of spin-aligned dimer 7Li2 is calculated at a number of basis sets. At the same time, the single-point energy scanning calculation is also made at each basis set near the equilibrium internuclear separation obtained by the geometry optimization so as to attain the more accurate result. A disagreement between the result obtained by the geometry optimization and that obtained by the single-point energy scanning calculation is found. Our analysis shows that the result obtained by the single-point energy scanning calculation should be more reasonable. We drew the conclusion that the basis sets 6-311++G(3df,3pd), 6-311++G(2df,2pd) and 6-311++G(2df,pd) are the most suitable ones for the 23Σ+g state calculation. The complete potential energy curve is further scanned at SAC-CI/6-311++G(3df,3pd) level of theory for the state over the internuclear separation range from 2.5a0 to 37a0, then a least squares fit to the Murrell-Sorbie function is made, at last the harmonic frequency is calculated, which is in good agreement with other theoretical results. At the same time, the same calculations are made for the ground state for comparison. In addition, we have also calculated the vibrational levels and the classical turning points.
Optical absorption spectra of Na5, Na6 and Na7 clusters: a theoretical study
Authors: Zhang Yan-Ping  , Zhang Feng-Shou  , Meng Ke-Lai  , Xiao Guo-Qing  ,   (1)北京师范大学低能核物理研究所, 北京 100875; (2)中国科学院近代物理研究所, 兰州 730000; (3)中国科学院近代物理研究所, 兰州 730000;中国科学院研究生院, 北京 100049
Published: December 2020

In the frame of time-dependent density functional theory, the dynamical polarizabilities of Na5, Na6 and Na7 clusters are calculated using a time-dependent local density approximation. By using Fourier transformation, the optical absorption spectra of Na5, Na6 and Na7 clusters are obtained from their dynamical polarizabilities. It is shown that experimentally measured optical absorption spectra of Na5, Na6 and Na7 clusters are reproduced in our calculations. Furthermore, the calculations of Na6 and Na7 clusters are in good agreement with the results of configuration interaction method. Compared with the three-dimensional structure of Na6, the calculated optical absorption spectra of Na6 with the two-dimensional structure are more close to the experimental data.
Study of electromagnetic scattering from fractal sea surface based on non-fully developed sea spectrum
Authors: Yang Jun-Ling  , Guo Li-Xin  , Wan Jian-Wei  ,   (1)国防科学技术大学电子科学与工程学院，长沙 410073; (2)西安电子科技大学理学院，西安 710071
Published: December 2020

The non-fully developed full-range sea spectrum (NDFSS) is reconstructed, and a fractal sea model based on NDFSS (NDFFM) is presented, witch is well applicable to the real sea surface. The two-scale method is used to calculate the backward radar cross section (BRCS) of the NDFFM sea surface, and the relationship between the model parameters and the BRCS is discussed in detail. Compared with the conventional fractal model and the real radar data, this model is proved to be accurate and efficient.
The influence of dispersion and loss on quantum key distribution system
Authors: Zheng Li-Ming  , Wang Fa-Qiang  , Liu Song-Hao  ,   (1)华南师范大学信息光电子科技学院,广州 510006; (2)华南师范大学信息光电子科技学院,广州 510006;暨南大学电子工程系,广州 510632
Published: December 2020

The influence of dispersion and loss on quantum bit error rate of a quantum key distribution system is analytically studied via quantum Schrdinger equation. The results show that the haul of quantum key distribution system can be increased by using the dispersion shift fiber and weak pulse with short pulse width in wavelength of 1.55 μm.
Development and behavior study of a ZnO nanowire-based electroluminescence device with double insulating-layer structure
Authors: Chang Yan-Ling  , Zhang Qi-Feng  , Sun Hui  , Wu Jin-Lei  ,   北京大学信息科学技术学院,纳米器件物理与化学教育部重点实验室,北京 100871
Published: December 2020

ZnO nanowire thin film was prepared by chemical solution method and a ZnO nanowire-based electroluminescence device has been successfully developed. The device was driven by the alternating current and presented a good RC behavior. Under the action of applied bias, light emission in the ultraviolet region with the wavelength of 387 nm and in the visible region with 552 nm has been observed. The mechanism of electroluminescence and its frequency dependence are discussed in this paper by analyzing the electric properties of the device and the structure of energy band of ZnO semiconductor.
A dynamical model of DNA-damage derived p53-Mdm2 interaction
Authors: Zhang Li-Juan  , Yan Shi-Wei  , Zhuo Yi-Zhong  ,   (1)北京师范大学低能核物理研究所,北京 100875; (2)北京师范大学低能核物理研究所,北京 100875;兰州重离子加速器国家重点实验室,兰州 730000; (3)北京师范大学低能核物理研究所,北京 100875;首都师范大学物理系,北京 100037
Published: December 2020

The recent experiments on the dynamics of a common biological network motif, p53-Mdm2 feedback loop in population and individual cells shows two different kinds of oscillatory behaviors, namely the damped and sustained oscillations, for the activities of p53 and Mdm2 proteins in response to DNA damage. By exploiting the nonlinear dynamics in the negative feedback loop and through analyzing the dynamical relation between the DNA damage and the activities of p53 and Mdm2 proteins, we propose a nonlinear dynamical model to describe the oscillatory behaviors for the activities of p53 and Mdm2 proteins both in individual and in population of cells in a self-consistent and unified way.
Spatial distribution of Thomson scattering driven by ultrashort laser pulse
Authors: Lan Peng_Fei  , Lu Pei_Xiang  , Cao Wei  ,   激光技术国家重点实验室和武汉国家光电实验室，华中科技大学，武汉 430074
Published: December 2020

The spatial distribution of Thomson scattering in an ultrashort laser pulse is investigated. It is found that the spatial distribution of the radiation depends sensitively on the carrier-envelope (CE) phase η0 of the ultrashort driving laser pulse. At η0=0,π, the spatial distribution of the radiation shows fourfold or twofold symmetry, while the symmetry breaks down at other CE phases. The collimation of the radiation also depends sensitively on the CE phase, and it reaches the best at η0＝±π/2. These results suggest that it is possible to control the spatial distribution of Thomson scattering by varying the CE phase of the driving laser pulse, or the CE phase of the ultrashort laser pulse can be measured by utilizing the phase-dependent spatial symmetry of Thomson scattering.
Research on a proportional-integral-derivative neural network decoupling control based on genetic algorithm optimization for unified chaotic system
Authors: Niu Pei_Feng  , Zhang Jun  , Guan Xin_Ping  ,   燕山大学电气工程学院，秦皇岛 066004
Published: December 2020

An improved genetic algorithm (IGA) was proposed. It can optimize the proportional-integral-derivative(PID) neural network decoupling controller's connecting weight value, so that it makes the PID controller's parameser to be optimized and realizes the decoupling control of multivariate nonlinearity systems. The IGA is superior to the elementary genetic algorithm. In the PID controller's parameter optimization, the IGA uses less calculations, is more efficient, and faster in convergence. When the optimized PID controller was applied to unified chaoticsystems, good control results were obtained by simulation experimentation, so t was proved that the PID controller when applied to unified chaotic systems wa effective.
The study on diode-pumped two-frequency solid-state laser with tunable frequency difference
Authors: Li Lei  , Zhao Chang-Ming  , Zhang Peng  , Yang Su-Hui  ,   北京理工大学信息科学技术学院光电工程系，北京 100081
Published: December 2020

The laser diode pumped two-frequency solid-state laser with tunable frequencydifference is investigated, the medium is a 1at% doped 2-mm thick Nd:YAG chip. The condition of stable two-frequency oscillation operation is analyzed, the polarization is calculated by Jones matrix in different locations at the resonator. It is proved that the two-frequency electric field vectors are orthogonally polarized everywhere, the frequency difference tuning can be realized by changing the angle between the fast axes of two quarter-wave plates. In the experiment, single-frequency oscillation was obtained with the help of an etalon, then longitudinal mode frequency splitting resulted in the two-frequency oscillating operation by inserting two quarter-wave plates. The obtained maximum frequency difference was 1.3GHz, the minimal was 50MHz because of the strong mode competition. Due to the loss anisotropy of the etalon, the output power is not very stable when tuning the frequency difference, 85mW two-frequency output power was obtained with 100MHz beat note.
Investigating of SRS and luminescence of ZnWO4 crystals
Authors: Zang Jing-Cun  , Xie Li-Yan  , Li Xiao  , Zhang Dong-Xiang  , Feng Bao-Hua  ,   (1)北京工业大学材料科学与工程学院，北京 100022; (2)中国科学院物理研究所光物理实验室，北京 100080
Published: December 2020

The stimulated Raman scattering (SRS) and luminescence spectra of ZnWO4 crystals were investigated using 532nm laser excitation at room temperature. It was found that the first order (558.7nm) and second order (588.6nm) of SRS have 130 and 77cm－1 line widths and the pump threshold at 558.7nm is 6.8mJ. The luminescence spectrum of ZnWO4 crystals under 532nm laser excitation has the peculiarity of having the band structure composed of three-Gaussian components. The photoluminescence spectrum shows broadband emission from 400nm to 650nm peaked about 472.0nm, which is attributed to the radiative transitions between tungsten and oxygen.
Upconversion luminescence of Tm3+/Yb3+-codoped oxyhalide tellurite glasses
Authors: Xu Shi-Qing  , Jin Shang-Zhong  , Zhao Shi-Long  , Zhang Li-Yan  , Wang Bao-Ling  , Wang Wei  , Bao Ren-Qiang  , Zhang Jue  ,   中国计量学院信息工程学院，杭州 310018
Published: December 2020

The upconversion luminescence spectra of Tm3+/Yb3+-codoped oxyhalide tellurite glasses have been investigated, and the action mechanisms of Tm2O3 content on upconversion luminescence of Tm3+/Yb3+-codoped oxyhalide tellurite glasses were analyzed. The results showed that there exists concentration quenching of Tm3+ in oxyhalide tellurite glasses. With increasing Tm2O3 content, upconversion blue and red emission intensities of Tm3+ first increase, reach its maximum at Tm2O3%=0.1mol%, and then decrease. The obtained results are conducive to increase upconversion luminescence efficiency of Tm3+.
Study of near infrared emission property of GeO2-Bi2O3-MOx(MOx=WO3, BaO) glasses
Authors: Wang Xue-Jun  , Xia Hai-Ping  ,   宁波大学光电子功能材料研究所，宁波 315211
Published: December 2020

Glasses with compositions (99.5-χ) GeO2-χBaO-0.5Bi2O3 (χ=3, 6, 9 mol%)and (99.5-φ)GeO2-φWO3-0.5Bi2O3 (φ=3，6，9 mol%)were prepared by conventional melting method. Their emission spectra (using 800nm LD excitation), fluorescence decay curves, absorption spectra and DTA curves were measured. Concomitant with the increase of WO3 concentration in the glasses system GeO2-WO3-Bi2O3, were the enhancement of glass thermal stability and emission intensity (centered at 1260nm) as well as the increase of FWHM and lifetime, and along with the increase of BaO concentration in the glass system GeO2-BaO-Bi2O3, were the enhancement of emission intensity (centered at 1290nm), the increase of FWHM and the prolongation of lifetime. In addition, in both groups, the absorption edges showed a red-shift with the increasing amount of WO3 or BaO, indicating that the Bi5+ ions may be responsible for the super broadband emission. In particular, the values of σp×τ and σp×Δλ parameters deduced from the emission properties suggested that the prepared glasses are a kind of promising material for optical amplifier covering the O to S communication bands.
Calculation of photonic band gap and first Brillouin zone for two-dimensional monoclinic lattice photonic crystal
Authors: Liu Di-Wei  , Liu Sheng-Gang  ,   电子科技大学物理电子学院THz实验室,成都 610054
Published: December 2020

Two-dimensional (2D) monoclinic lattice photonic crystal has potential application for light focusing device and photonic crystal waveguides. In this article, the first Brillouin zone (BZ) and the method of calculating the photonic band gaps of two-dimensional monoclinic lattice photonic crystal are discussed. The photonic band gap (PBG) structure of triangular lattice photonic crystal calculated by the method described in this article agrees well with that from the conventional method. Furthermore, the calculated PBG structure of 2D monoclinic lattice in critical conditions are consistent with either hexagon or rectangle BZ, which shows that the method described here is valid.
Precise control of femtosecond Ti:sapphire laser frequency comb
Authors: Han Hai_Nian  , Zhang Wei  , Wang Peng  , Li De_Hua  , Wei Zhi_Yi  , Shen Nai_Chen  , Nie Yu_Xin  , Gao Yu_Ping  , Zhang Shou_Gang  , Li Shi_Qun  ,   (1)国家授时中心，临潼 710600; (2)清华大学物理系原子分子与光物理研究所，北京 100084; (3)中国科学院物理研究所北京凝聚态物理国家实验室，光物理实验室，北京 100080; (4)中国科学院物理研究所北京凝聚态物理国家实验室，光物理实验室，北京 100080；清华大学物理系原子分子与光物理研究所，北京 100084
Published: December 2020

Phase controlled Femtosecond Ti:sapphire laser frequency comb have been widely used in measurement of absolute optical frequency, which is the revolutionary progress in the optical metrology. In this paper, based on the home-made 90MHz femtosecond Ti:sapphire laser, we firstly broadened the spectrum output directly from the laser to more than one octave with a piece of photonic crystal fiber，then locked precisely both the repetition rate and the carrier-envelope phase offset frequency to the same Cs clock with the stability of 6×10－14 by use of two sets of different phase-locked loops. As a result, we obtained the phase controlled Femtosecond laser frequency comb with the stability of the Cs clock.
Role of gas residence time in the deposition rate and properties of microcrystalline silicon films
Authors: Guo Qun-Chao  , Geng Xin-Hua  , Sun Jian Wei  , Chang-Chun  , Han Xiao-Yan  , Zhang Xiao_Dan  , Zhao Ying  ,   南开大学光电子薄膜器件与技术研究所天津市重点实验室，光电信息技术科学教育部重点实验室，天津 300071
Published: December 2020

To realize high deposition rate is an important problem in low-cost industrialization of microcrystalline silicon solar cells. Deposition of μc-Si:H films at a high rate was investigated using very-high-frequency plasma-enhanced chemical vapor deposition (VHF-PECVD) in this paper. The influence of gas residence time on de position rate and the photoelectric and micro structural properties in the CVD process were studied by changing total gas flow. As a result, the efficiency of the microcrystalline silicon solar cell prepared at deposition rate 12?/s reached 5.3%.
Boundary effect analysis of electromagnetic mode in the beam-ion channel
Authors: Su Dong  , Tang Chang-Jian  , Liu Pu-Kun  ,   (1)四川大学物理科学与技术学院，成都 610065; (2)中国科学院电子学研究所，北京 100080
Published: December 2020

Considering the disturbance of the plasma electrons at the beam-ion channel boundary, the eigen-equation of TM mode has been derived. On the basis of comparing the electromagnetic characteristics of the beam-ion channel with a traditional medium waveguide for the condition of a step-boundary defined in this paper, the numerical simulation results show that by changing the plasma frequency one can control the electromagnetic working mode in ion channel. Analyzing the influence of the disturbed charge boundary and the step-boundary on electromagnetic mode in the beam-ion channel, one can find that the cut-off frequency of the beam-ion channel have increased in the low frequency range effectively (ωωp， ωp is the plasma frequency) and some new electromagnetic modes appear in the high frequency range (ω>ωp) with the disturbed charge boundary. These findings can provide an important theoretical basis for the design of the ion channel electronics cyclotron maser (ICECM) and the ion channel laser (ICL).
Effect of preparation methods on thermoelectric properties of p-type Bi2Te3-based materials
Authors: Jiang Jun  , Li Ya-Li  , Xu Gao-Jie  , Cui Ping  , Wu Ting  , Chen Li-Dong  , Wang Gang  ,   (1)洛阳耐火材料研究院,洛阳 471039; (2)中国科学院宁波材料技术与工程研究所,宁波 315040; (3)中国科学院上海硅酸盐研究所,上海 200050
Published: December 2020

p-type Bi2Te3-based thermoelectric materials were fabricated by various methods, such as zone-melting, mechanical alloying, spark plasma sintering (SPS) and hot-pressing. Electrical conductivity (σ), Seebeck coefficient (α), and thermal conductivity (κ) were measured in the temperature range of 300—500K. The influence of the preparation methods on thermoelectric properties was studied. Compared with that of the zone-melted ingot, the figure of merit ZT (ZT=α2σT/κ) of those materials fabricated by the other methods mentioned were all increased to some extent. The obtained maximum ZT value was about 1.15 for that fabricated by the combination of zone-melting and spark plasma sintering technique.
Optimizing modeling of two-color middle wavelength infrared photovoltaic HgCdTe detectors
Authors: Xu Xiang-Yan  , Ye Zhen-Hua  , Li Zhi-Feng  , Lu Wei  ,   中国科学院上海技术物理研究所,红外物理国家重点实验室,上海 200083
Published: December 2020

The performance of two-color middle wavelength photovoltaic HgCdTe detector is simulated numerically for design optimization. Three recombination mechanisms (radiation, Auger, and Shockley-Read-Hall(SRH)recombination), trap-assisted tunneling, and band-to-band tunneling are considered in two-dimensional model. The tunneling through barrier layer is calculated by transfer matrix method. The n-p-p-p-n structure is designed in simultaneous mode. The effect of SRH recombination electron lifetime in p-region on spectral response is examined, and the dependence of crosstalk on composition gradient of barrier layer is analyzed. Simulation results show that the quantum efficiency decreases rapidly with decrease of SRH electron lifetime in p-region,and at least about 10ns of SRH electron lifetime is essential for good performance of the detector. Crosstalk decreases to the steady value determined by optical crosstalk as the composition gradient of barrier layer increases to about 0.03, so critical composition gradient of about 0.03 is necessary for suppressing the electrical crosstalk.
Deposition of p-type nc-SiC：H thin films with subtle carbon incorporation for applications in p-i-n solar cells
Authors: Xu Ying  , Diao Hong-Wei  , Zhang Shi-Bin  , Li Xu-Dong  , Zeng Xiang-Bo  , Wang Wen-Jing  , Liao Xian-Bo  ,   (1)北京市太阳能研究所有限公司，北京 100083; (2)葡萄牙里斯本大学材料中心，里斯本2829-516 葡萄牙; (3)中国科学院半导体研究所表面物理国家重点实验室，凝聚态物理中心，北京 100083; (4)中国科学院半导体研究所表面物理国家重点实验室，凝聚态物理中心，北京 100083；北京市太阳能研究所有限公司，北京 100083
Published: December 2020

This paper presents a detailed study on the effects of carbon incorporation and substrate temperature on structural, optical, and electrical properties of p-type nanocrystalline amorphous silicon films. A p-nc-SiC：H thin film with optical gap of 1.92eV and activation energy of 0.06eV is obtained through optimizing the plasma parameters. By using this p-type window layer, single junction diphasic nc-SiC：H /a-Si：H solar cells have been successfully prepared with a Voc of 0.94eV.
RF magnetron sputtering of GaP thin film and computer simulation of its depositing process
Authors: Li Yang-Ping  , Liu Zheng-Tang  , Zhao Hai-Long  , Liu Wen-Ting  , Yan Feng  ,   西北工业大学材料学院，西安 710072
Published: December 2020

GaP IR thin films were deposited through RF magnetron sputtering with a GaP disk as the target. The intensity of Ar I 750nm optical emission line was kept the same in different experiments, with which various deposition parameters were got, and the deposition processes were studied with computer simulation. The results showed that under low sputtering power and high working gas pressure, the sputtering yields and transporting efficiencies of Ga and P atoms as well as their energies at arriving the substrate's surface are small, the sputtering yield and transporting efficiency of Ga atom are both larger than those of P atom, hence the depositing rate of GaP film is low, the content of Ga in the film is larger than that of P, which makes the film have high absorbance in IR waveband. But under high sputtering power and low working gas pressure, the atoms' sputtering yields, transporting efficiencies and energies at arriving the substrate's surface all increase, the sputtering yield of Ga atom is larger than that of P atom, whereas its transporting efficiency is smaller than that of P atom, hence the depositing rate of GaP film is high and stoichiometric film with low absorbance is deposited, which is advantageous to depositing large-thickness GaP film.
Frequency response and tolerance of reflection-mode magneto-optical multi layer film isolator
Authors: Li Guo_Jun  , Kang Xue_Liang  , Li Yong_Ping  , Lü Chao  , Fan Zheng-Xiu  , Ding Lei  , Sui Zhan  ,   (1)中国工程物理研究院第八研究所，绵阳 621900; (2)中国科学技术大学物理系，合肥 230026; (3)中国科学技术大学物理系，合肥 230026；中国科学院量子信息重点实验室，合肥 230026; (4)中国科学院上海光学精密机械研究所，上海 201800
Published: December 2020

Using the transfer matrix method, we investigated the influence of permittivity error on the properties of magneto-optical multi layer isolator with single-defect, and presented a new type of multi layer structure with multi defect. Compared with single-defect structure, the bandwidth of Faraday rotation frequency response of multi defect structure was increased greatly, and the tolerance of permittivity was increased by one order. Furthermore, the multi defect structure has greater tolerance of film thickness and incidence angle.
Spin relaxation dynamics in InAs monolayer and submonolayer
Authors: Sun Zheng  , Xu Zhong-Ying  , Ruan Xue-Zhong  , Ji Yang  , Sun Bao-Quan  , Ni Hai-Qiao  ,   中国科学院半导体研究所，超晶格国家重点实验室，北京 100083
Published: December 2020

By using time-resolved photoluminescence and time-resolved Kerr rotation, we have studied the unique electron spin dynamics in InAs monolayer (ML) and submonolayer (SML), which were sandwiched in GaAs matrix. Under non-resonant excitation, the spin relaxation lifetimes of 3.4ns and 0.48ns were observed for 1/3ML and 1ML InAs samples, respectively. More interestingly, the spin lifetime of the 1/3ML InAs decreased dramatically under resonant excitation, down to 70ps, while the spin lifetime of the 1ML sample did not vary much, changing only from 400 to 340ps. These interesting results come from the different electron-hole interactions caused by different spatial electron-hole correlation, and they provide a direct evidence of the dominant spin relaxation process, i.e. the BAP mechanism. Furthermore, these new results may provide a valuable enlightenment in controlling the spin relaxation and in seeking new material systems for spintronics application.
The mechanism of self-assembly of polystyrene submicrospheres at water-air interface
Authors: Wang Xiao-Dong  , Dong Peng  , Chen Sheng-Li  , Yi Gui-Yun  ,   中国石油大学重质油国家重点实验室，北京 102249
Published: December 2020

The mechanism of polystyrene submicrosphere assembly in aqueous suspension was studied systemically. During the evaporation of solvent, the PS spheres were transported to the water-air surface, where these spheres self-assembled into colloidal crystal through the capillary force between the particles at water-air interface. The wettability of the PS spheres at the water-air interface could change from complete wetting to partial wetting and finally to non-wetting with the evaporation of water, so that the contact angle between the PS spheres and water increased gradually. The researches showed that only after the contact angle reached a critical value θ′critical, could the PS sphere-assembly occur. The critical value θ′critical which was obtained from the Wenzel equation,was greate than the measured value θcritical＝22°, because the surface of PS colloidal crystal was “regularly” coarse. The change of the PS spheres at water-air interface from hydrophilic to hydrophobic is essential for the PS spheres assembling into colloidal crystals.
Approximate solving method for a generalized perturbed mechanism of western boundary undercurrents in equator pacific
Authors: Mo Jia-Qi  , Lin Wan-Tao  , Lin Yi-Hua  ,   (1)LASG，中科院大气物理研究所,北京  100029; (2)安徽师范大学,芜湖  241000; 上海高校计算科学E-研究院SJTU研究所，上海  200240; 湖州师范学院，湖州  313000
Published: December 2020

A class of perturbation mechanisms for the western boundary undercurrents in the equator Pacific is considered. The generalized governing equations are studied. Firstly, an optimal homotopic mapping is introduced. And the approximate solution is obtained for original model using the corresponding method of the homotopic mapping. Finally, an example shows that a good precision is altained for the approximate solution using the method of homotopic mapping.
On a four-winged chaotic attractor
Authors: Wang Fan-Zhen  , Qi Guo-Yuan  , Chen Zeng-Qiang  , Yuan Zhu-Zhi  ,   (1)南开大学信息技术科学学院自动化系，天津 300071; (2)天津科技大学电子信息与自动化学院，天津 300222
Published: December 2020

A four-winged chaotic attractor was first observed numerically in a new 4-dimensional system. However, it was found to be a numerical artifact upon further analysis. It actually consists of two (upper and lower) coexisting double-wing chaotic attractors with domains of attraction independent of each other. The reason leading to the confusion is that both double-wing attractors are arbitrarily close to each other so as to cause a numerical error as well as a misunderstanding. By adding a simple linear state feedback term to the system, some similaritics of the system are destroyed, then the controlled system is able to generate diagonal double chaotic attractor which can cross the boundary between the upper and lower attractive domains. With the evolution of dynamical modes, the upper and the lower double-wing chaotic attractors as well as diagonal chaotic attractor are merged into a true four-winged chaotic attractor. At last, the frequency spectrum analysis shows that the four-winged chaotic attractor has extremely wide frequency bandwidth compared with that of the Lorenz system and Chua circuit, which is important in practical applications in communication encryption etc.
Study of the point defect, Re site, and Re cluster in Re embedded Ni3Al using the embedded atom method
Authors: Yu Song  , Wang Chong-Yu  , Yu Tao  ,   (1)钢铁研究总院,北京 100081; (2)钢铁研究总院,北京 100081; 清华大学物理系，北京 100084; 中国科学院国际材料物理中心,沈阳 110016
Published: December 2020

An analytical embedded atom method model of Ni-Al-Re system is constructed on the basis of the physical properties of pure constituents Ni, Al, and Re. The characteristic properties of Ni3Al, including equilibrium lattice constant, elastic constants, cohesive energy, vacancy formation energy, and antisite defect formation energy, are calculated. The types of point defects in Ni3Al are discussed, and it is shown that the point defect is the antisite defect in the nonstoichiometric case. Furthermore, the occupation site of Re in Ni3Al is analyzed, the clustering of Re in Ni3Al and Ni are also studied. The calculation results show that the occupational site of Re is the Al site, and that the growth tendency of Re cluster becomes weak when the size of Re cluster reaches to 11?. The present calculations are in agreement with the experiment and the theoretical results obtained by other authors.
Experimental investigation of a novel tunable all-optical wavelength converter with a double-ring cavity
Authors: Wang Jian  , Sun Jun-Qiang  , Guo Yong-Juan  , Li Jing  , Sun Qi-Zhen  ,   武汉光电国家实验室，华中科技大学光电子科学与工程学院，武汉 430074
Published: December 2020

Exploiting the cascaded sum- and difference-frequency generation in a periodically poled lithium niobate (PPLN) waveguide, a novel scheme of tunable all-optical wavelength conversion is proposed and experimentally demonstrated by use of a PPLN-based double-ring cavity configuration. Wavelength conversion of picosecond pulses from the signal wavelength to the idler wavelength is realized. A pulsed signal source with a repetition rate of 40 GHz and a pulse width of 1.57ps is adopted. The pump and control waves are generated from the double-ring fiber laser. Therefore, no external continuous-wave (CW) light is required.
Study of temperature characteristic of rigid holographic bright solitons based on photorefractive two-wave mixing
Authors: Zhang Guang-Yong  , Liu Jin-Song  , Liu Shi-Xiong  , Zhang Hui-Lan  , Wang Cheng  ,   (1)华中科技大学光电子科学与工程学院激光技术国家重点实验室，武汉 430074; (2)华中科技大学光电子科学与工程学院激光技术国家重点实验室，武汉 430074; 中国地质大学物理系，武汉 430074
Published: December 2020

The temperature dependence of the dynamical evolution of rigid holographic bright solitons in photorefractive dissipative systems based on two-wave mixing is studies. Numerical results show that the stability of rigid holographic bright solitons in such systems depends strongly on the crystal temperature. The soliton formed at a given temperature can propagate stably in the crystal over a distance that is long enough. The input solitary beam can evolve into a stable soliton and propagate in the crystal when the temperature drift is quite small, whereasit will not evolve into a stable soliton and its intensity becomes increasing or decreasing with propagation if the temperature difference is large. A potential application of temperature properties of rigid holographic solitons in optical attenuators or repeaters is discussed.
Electronic structure and optical properties of ZnO doped with transition metals
Authors: Shen Yi-Bin  , Zhou Xun  , Xu Ming  , Ding Ying-Chun  , Duan Man-Yi  , Linghu Rong-Feng  , Zhu Wen-Jun  ,   (1)贵州师范大学物理与电子工程系，贵阳 550001; (2)四川师范大学物理与电子工程学院&固体物理研究所低维结构物理实验室，成都 610068; (3)四川师范大学物理与电子工程学院&固体物理研究所低维结构物理实验室，成都 610068；中国工程物理研究院流体物理研究所冲击波物理与爆轰物理重点实验室，绵阳 621900; (4)四川师范大学物理与电子工程学院&固体物理研究所低维结构物理实验室，成都 610068；重庆邮电学院光电工程学院，重庆 400065
Published: December 2020

The electronic and optical properties of ZnO doped with 3d transition metals with wurtzite structure are studied with density functional theory based on ultra-soft psuedopotential. The cohesive energy, density of state, band structure, and optical absorption properties are calculated. Furthermore, we analyzed the change of electron structure, bonding and optical properties after doping in comparison with the experimental results.
Characterization of Ni/Au GaN Schottky contact base on I-V-T and C-V-T measurements
Authors: Liu Jie  , Hao Yue  , Feng Qian  , Wang Chong  , Zhang Jin-Cheng  , Guo Liang-Liang  ,   西安电子科技大学微电子学院，宽禁带半导体材料与器件教育部重点实验室，西安 710071
Published: December 2020

Based on the temperature-dependent current-voltage (I-V-T) measurements and the temperature-dependent capacitance-voltage (C-V-T) measurements of Schottky diodes fabricated on n-type GaN，the mechanism of the electrical current transport was discussed using thin surface barrier (TSB) model. The experiment results indicated that there are different mechanisms at different temperatures and bias. Based on this assumption we give a modified I-V characteristic formula which gives excellent fit to the experiment data. The SBHs determined from high-temperature I-V curves，low-temperature C-V curves，and the metal work function agree well each other.
Low-temperature ordered CoPtCu/Ag nanocomposite film with (001) texture
Authors: Xue Shuang-Xi  , Wang Hao  , Wong S. P.  ,   (1)湖北大学物理学与电子技术学院暨纳米技术研究中心,武汉  430062; (2)台州学院物理与电子工程学院,临海  317000; (3)香港中文大学电子工程系, 香港
Published: December 2020

CoPtCu/Ag nanocomposite films have been prepared using CoPt/Cu/Ag multilayer precursor by magnetron sputtering and subsequent vacuum thermal annealing. Low-temperature ordered CoPtCu/Ag nanocomposite films with (001) texture have been prepared successfully with the optimized content of Ag and Cu in the films. The CoPtCu/Ag films start ordering at a low annealing temperature of 450℃, which is roughly lower by 150℃ than that needed for most CoPt-based films. Our present study shows that the Ag plays a dominant role in inducing the (001) texture of the film and the Cu additive is very effective to reduce the ordering temperature in CoPtAg system. The Co40Pt36Cu8Ag16 film after annealing at 500℃ exhibits a large perpendicular coercivity of 5.0×105 A/m with a small average grains size of 4—5 nm, implying the potential of the films as future ultrahigh density magnetic recording media.
Monte Carlo simulation of effect of neutron scattering on image information in 14MeV fast neutron radiography
Authors: Zhang Fa-Qiang  , Yang Jian-Lun  , Li Zheng-Hong  , Ying Chun-Tong  , Liu Guang-Jun  ,   (1)清华大学工程物理系，北京 100084; (2)中国工程物理研究院核物理与化学研究所，绵阳 621900
Published: December 2020

Referring to the experimental parameters, the physical model of neutron radiography with 14MeV neutrons is built and the process of radiography is simulated using the Monte Carlo method. Effect of neutron scattering by a polyethylene sample on radiography is analyzed as a function of d, the distance between the sample and the detector, and parameters of the sample. The calculated results indicates that for a d values smaller than 5cm, intensity of scattered neutron component strongly depends on d, while when d is greater than 20cm, the influence of scattered neutrons to the image is reduced to a negligible level. The results also indicates that the effect of neutron scattering is relatively large when density of the sample ranges from 3g/cm3 to 5g/cm3, and intensity of scattered neutron component increases with width of the sample and is almost saturated at width greater than 3cm.
Test and analysis of uniform magnetic fields for imaging of electrons produced in ion-atom collisions
Authors: Feng Wen-Tian  , Ma Xin-Wen  , Liu Hui-Ping  , Chen Lan-Fang  , Li Bin  , Cao Shi-Ping  ,   (1)中国科学院近代物理研究所，兰州 730000; (2)中国科学院近代物理研究所，兰州 730000;中国科学院研究生院，北京 100049
Published: December 2020

In order to expand the solid angle for imaging of electrons in ion-atom collisions,　we designed a complex Helmholtz coils composed of four single coils. Theoretical simulations were carried out to optimize the arrangement of the coils. The complex is constructed according to the theoretical analysis, and the magnetic fields were measured for interested regions. The measured results show that the relative uniformity of the magnetic fields is ±0.6%, which satisfies the requirements of collision experiments.
Bound state solutions of relativistic particles in a new ring-shaped non-harmonic oscillator potential
Authors: Zhang Min-Cang  , Wang Zhen-Bang  ,   陕西师范大学物理学与信息技术学院，西安 710062
Published: December 2020

In this paper, a new ring-shaped non-harmonic oscillator potential is proposed. Under the condition of equal scalar and vector potentials, the exact bound solutions and energy equations of both the Klein-Gordon equation and Dirac equation for this oscillator potential are obtained. It is shown that the angular wave functions of Klein-Gordon equation are given by the hypergeometric functions and the radial wave functions are expressed in terms of the confluent hypergeometric functions or general Laguerre polynomial. The spinner wave functions of the Dirac equation are constructed with the of the Klein-Gordon equation.
Electric field simulation of a symmetrical plasma actuator system
Authors: An Zhi-Yong  , Li Ying-Hong  , Wu Yun  , Su Chang-Bing  , Song Hui-Min  ,   空军工程大学工程学院,西安 710038
Published: December 2020

In this paper, the electric field of a symmetrical actuator system is simulated and the plasma flow control mechanism is analysed. The peristaltic acceleration process in electromagnetic field is simulated with finite-difference time_domain method and the result accurately consists with theoretical analysis, and the peristaltic acceleration mechanism is discussed. Our results may provide a theoretical basis for improving the peristaltic acceleration and optimizing the symmetrical plasma actuator configuration.
First principles calculations on anatase implanted by V+
Authors: Hou Xing-Gang  , Liu An-Dong  ,   北京师范大学低能核物理研究所，射线束技术与材料改性教育部重点实验室，北京市辐射中心，北京 100875
Published: December 2020

V+ were implanted into anantase films by metal ion implantation. The electronic band structures of TiO2 films doped with V+ were calculated using a self-consistent full-potential linearized augmented plane-wave method within the first principles formalism. Influence of implantation on TiO2 films were examined by ultraviolet-visible spectrometry. The results of experiment and calculation show that the optical band gap of TiO2 films is narrowed by ion implantation. The calculation shows that the 3d state of V+ plays a significant role in red shift of ultraviolet-visible absorbance spectrum. It was also found that the optical band gap of TiO2 films decreases, with increasing amount of V+.
The influence of substrate on texture of Cu(In,Ga)Se2 film
Authors: Li Wei  , Ao Jian-Ping  , He Qing  , Liu Fang-Fang  , Li Feng-Yan  , Li Chang-Jian  , Sun Yun  ,   南开大学光电子薄膜器件与技术研究所,光电子薄膜器件与技术天津市重点实验室，天津 300071
Published: December 2020

Cu(In,Ga)Se2 layers with thickness of 2 μm were prepared by co-evaporation on different substrates of soda-lime glass, Mo foil, Mo film without preferred orientation and (100)-oriented Mo film. X-ray diffraction measurements were carried out to study the influence of substrates on the preferential growth of the films. The (112) texture of Cu(In,Ga)Se2 films deposited on the four substrates mentioned above decreases the given order, while the (220/204) texture begins to appear at first and its intensity increases gradually. On the soda-lime glass and Mo foil surfaces, the Cu(In,Ga)Se2 film shows almost a pure (112) texture. On the contrary, the (220/204) Cu(In,Ga)Se2 surface orientation dominates on the substrate of (110)-oriented Mo film. On Mo film without preferred orientation, no evidence of significant texture exists in Cu(In, Ga)Se2 layers. These results indicate that, of the substrates investigated, only the (110)-oriented Mo film has significant influence on the formation of (220) texture in Cu(In,Ga)Se2 film.
Quantum communication protocol for data link layer based on entanglement
Authors: Zhou Nan-Run  , Zeng Gui-Hua  , Gong Li-Hua  , Liu San-Qiu  ,   (1)南昌大学电子信息工程系,南昌  330031; (2)南昌大学物理系,南昌 330031; (3)上海交通大学电子工程系,上海 200240
Published: December 2020

By exploiting the entanglement correlation in quantum mechanics, a quantum communication, protocol for data link layer is proposed. The protocol divides the link into busy time and leisure time, where the data is sent via classical channel and the distribution of quantum entanglement is supposed to be completed at leisure time and the acknowledge frame is sent via quantum entanglement channel. The transmission of quantum information can be instantaneous; therefore the minimum time span between two successfully delivered data frames can be significantly reduced. It is shown that the proposed protocol enhances the maximum throughput effectively and improves the performance of the stop-and-wait protocol of data link layer.