bluuebunny/crossref_metadata_2025 huggingface dataset:
Comparative theoretical study of hydrogen storage in single-walled boron-nitride and carbon nanotubes
Authors: Liu Xiu-Ying  , Wang Chao-Yang  , Tang Yong-Jian  , Sun Wei-Guo  , Wu Wei-Dong  , Zhang Hou-Qiong  , Liu Miao  , Yuan Lei  , Xu Jia-Jing  ,   (1)四川大学原子与分子物理研究所，成都  610065; (2)四川大学原子与分子物理研究所，成都  610065；中国工程物理研究院激光聚变研究中心，绵阳  621900; (3)中国工程物理研究院激光聚变研究中心，绵阳  621900
Published: December 2020

Using the grand canonical Monte Carlo simulations (GCMC), the physisorption storage of hydrogen in single-walled boron-nitride nanotubes (SWBNNTs) and single-walled carbon nanotubes (SWCNTs) is studied. The influences of nanotube diameter, temperature and chirality on physisorptions in SWBNNTs and SWCNTs are mainly investigated comparatively. The results show that, the physisorption properties of SWBNNTS are superior to those of SWCNTS at lower temperatures; however, with the increasing of temperature, the differences between them become smaller. The physisorption amounts of SWBNNTs are comparable with those of SWCNTs at ambient temperature, which are only slightly larger than SWCNTs under higher pressures; a reasonable theoretical explanation is also given. In addition, with respect to the influences of temperature, tube diameter and chirality on physisorptions of hydrogen storage, the SWBNNTs have the same trend as the SWCNTs.
First-principles study of hydrogen atom in interstitial sites of NiAl and Cr
Authors: Shang Jia-Xiang  , Yu Tan-Bo  ,   北京航空航天大学材料科学与工程学院,北京  100191
Published: December 2020

The site occupancy of hydrogen atom in B2-NiAl and Cr alloys and its effect on NiAl and Cr were studied by the first-principle plane-wave pseudopotential method. For NiAl system the impurity formation energies of hydrogen are -2.365 and -2.022eV in the Al-rich octahedral site and Ni-rich octahedral site, respectively, while it is unstable in a tetrahedral site. For Cr system, the impurity formation energies of hydrogen are -2.344 and -2.605eV in the octahedral site and tetrahedral site, respectively. The most stable site of hydrogen is the Al-rich octahedral site in NiAl and the tetrahedral site in Cr. It is most probable that hydrogen mainly occupies the interstitial site in NiAl/Cr alloy. By analysis of the atomic structure, electron population, valence electron density and the density of states, the effects of hydrogen atom on atomic structure and electronic structure of NiAl and Cr alloys are discussed.
Room-temperature ferromagnetism in Co-doped ZnO fabricated by coprecipitation method
Authors: Yan Guo-Qing  , Xie Kai-Xuan  , Mo Zhong-Rong  , Lu Zhong-Lin  , Zou Wen-Qin  , Wang Shen  , Yue Feng-Juan  , Wu Di  , Zhang Feng-Ming  , Du You-Wei  ,   (1)东南大学物理系,南京  210096; (2)南京大学物理系,南京  210093; (3)南京大学物理系,南京  210093；宿州学院物理与电子工程系,宿州  234000
Published: December 2020

Nanocrystalline Zn1-xCoxO samples were prepared by coprecipitation and annealing at 300 ℃ for 3 h in 5vol.%H2/Ar flow. Scanning electron microprobe measurements indicate that the samples with nominal Co contents of 0.05, 0.10, and 0.15 have the actual Co contents of 0.054, 0.100, and 0.159 respectively. X-ray diffraction patterns show that the major phase of the samples is of wurtzite structure, while the minor phase of CoO is observed in samples with Co contents of x=0.100 and 0.159. X-ray photoelectron spectroscopy shows that Co has three states: Co incorporated into ZnO matrix, CoO and metallic Co. It was found through magnetic measurements, that room-temperature ferromagnetism exists in all the samples and it comes from both the weak ferromagnetism of Zn-doped CoO1-δ and the magnetism of metallic Co clusters.
Luminescence characteristics of LiBaBO3:Eu2+ phosphor for white LED
Authors: Wang Zhi-Jun  , Li Pan-Lai  , Wang Ying  , Yang Zhi-Ping  , Guo Qing-Lin  ,   河北大学物理科学与技术学院，保定  071002
Published: December 2020

The LiBaBO3:Eu2+ green phosphor was synthesized by high temperature solid-state method. With the Eu2+ doping of 1mol%, the emission and excitation spectra of LiBaBO3:Eu2+ phosphor were measured. The emission spectrum shows two peaks at 482 and 507nm, which are in good agreement with the theoretical values. The excitation spectrum for 482nm emission has two excitation peaks at 287 and 365nm, and for 507nm excitation emission at 365 and 405nm. The effect of Eu2+ concentration on the emission spectrum of LiBaBO3:Eu2+ phosphor was investigated. The results show that red shift takes place in the blue and green emission spectra with increasing Eu2+ concentration, and the blue emission disappears at 3 mol% Eu2+. However, the green emission always exists. The dependence of luminescent intensity of LiBaBO3:Eu2+ phosphor on the Eu2+ concentration was studied, and the results show that the luminescent intensity firstly increases with the increasing Eu2+ concentration, then decreases, and reaches the maximal value at 3 mol% Eu2+. According to the Dexter theory, the concentration quenching mechanism is the d-d interaction.
Effects of magnetic field on current in polymer photovoltaic cell
Authors: Lei Yan-Lian  , Liu Rong  , Zhang Yong  , Tan Xing-Wen  , Xiong Zu-Hong  ,   西南大学物理科学与技术学院，发光与实时分析教育部重点实验室，重庆  400715
Published: December 2020

Polymer photovoltaic cells were fabricated with the basic device structure of ITO/PEDOT: PSS/P3HT: PCBM/Ca/Al. The magnetic-field-dependent current under illumination and in darkness in these devices were measured respectively under different bias. It was found that the light current was enhanced by the magnetic field whereas the dark current was suppressed. Based on the formation mechanism of the light current and the dark current in polymer solar cell, the observed magnetic field effects were explained. The results show that the magnetic field can effectively change the relative ratio between the singlet and the triplet polaron pairs, resulting in an increase in the density of the free carriers. The concentration augmentation of photo-generated free carriers is responsible for the increase of the photocurrent. On the other hand, the interaction between the free carriers and triplet excitons leads to the decrease of the dark current. Around the open circuit voltage, the magnetic field dependent photocurrent and dark current acting together causes the magnetic field effect of light current.
Optical limiting performance of multi-walled carbon nanotubes
Authors: Yuan Yan-Hong  , Miao Run-Cai  ,   (1)上海电机学院文理学院，上海  200240; (2)西安航空技术高等专科学校机械系，西安  710077
Published: December 2020

The multiwalled carbon nanotubes (MWNTs) were synthesised by chemical vapor deposition and then dissolved in toluene solution. It is discovered experimentally that MWNTs have obvious optical amplitude limiting when the transmittance is measured by means of ps laser pulses with wavelength of 1064nm. In the case of low incident intensity, the transmittance varies linearly with incidenct intensity. However, the transmittance increases slowly under the condition of high incidenct light intensity and at last becomes saturated. Transmission is near 100% for weak incidenct light. But it is 30% when incidence intensity is 8GW/cm2. The calculated results based on three-photon-absorption theory agree well with the experimental results and it is inferred that the optical limiting of MWNTs results from its three-photon-absorption. The absorption coefficient γ is 1.36×10-20cm3/W2 and its corresponding absorption section σ′3 is 2.8×10-77cm6·s2.
Influence of boron on the properties of intrinsic microcrystalline silicon thin films
Authors: Sun Fu-He  , Zhang Xiao-Dan  , Wang Guang-Hong  , Xu Sheng-Zhi  , Yue Qiang  , Wei Chang-Chun  , Sun Jian  , Geng Xin-Hua  , Xiong Shao-Zhen  , Zhao Ying  ,   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，光电信息技术科学教育部重点实验室，天津  300071
Published: December 2020

A series of microcrystalline silicon thin films were fabricated by very high frequency plasma enhanced chemical vapor deposition (VHF-PECVD) in a single-chamber under different boron-contamination conditions. The influence of boron on the properties of intrinsic microcrystalline silicon thin film was studied. The results show that the dark conductivity decreases with the increase of boron contamination and the photosensitivity shows the opposite change. The activation energy varies due to different degrees of boron contamination on these thin films. The boron contamination decreases the crystalline volume fraction and weakens the (220) prefered orientation intensity. However, the effect of contamination is less serious to the material, prepared at relatively high power and high hydrogen dilution, which has higher crystalline volume fraction and stronger (220) preferred orientation.
An optical emission spectroscopy study on the high rate growth of microcrystalline silicon films
Authors: Han Xiao-Yan  , Geng Xin-Hua  , Hou Guo-Fu  , Zhang Xiao-Dan  , Li Gui-Jun  , Yuan Yu-Jie  , Wei Chang-Chun  , Sun Jian  , Zhang De-Kun  , Zhao Ying  ,   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，光电信息技术科学教育部重点实验室，天津  300071
Published: December 2020

The growth process of microcrystalline silicon thin films deposited at high growth rate was monitored online by optical emission spectroscopy. The properties of the material were studied by Raman and FTIR spectroscopy. The results indicated that the I［SiH*］/I［Hβ*］ ratio decreased during the process, particularly at low total gas flows, which was consistent with the Raman results. The I［Hβ*］/I［Hα*］ratio detected after the plasma glowed for 5 minutes showed that the electronic temperature first decreased then increased with the increasing Ftotal. The FTIR spectra showed that the microstructure defect fraction R first decreased then increased with increasing Ftotal. This means that the electronic temperature in hydrogen plasma plays an important role in determining the properties of the microcrystalline silicon thin films.
Nonlinear nature of spectral components in heart rate variability
Authors: Li Cheng  , Tang Da-Kan  , Fang Yong  , Sun Jin-Tao  , Ding Guang-Hong  , Poon Chi-Sang  , Wu Guo-Qiang  ,   (1)Harvard-MIT Division of Health Sciences & Technology,MIT,Cambridge,MA 02139  USA; (2)复旦大学力学与工程科学系，上海  200433; (3)复旦大学通信科学与工程系，上海  200433
Published: December 2020

We proposed a new hybrid method combining the band-phase-randomized surrogate data with noise titration to discern the influence of spectral components on heartbeat chaos. The results demonstrate that the chaotic strength of phase-randomized surrogate data in the high frequency band (HF) of heart rate variability (HRV) is reduced significantly, which indicates that the frequency components of spectral analysis involve intrinsic chaotic information. The hybrid method proposed in this study is effective to distinguish the different contributions of spectral components to chaotic strength of the test data. This method is applicable not only to HRV but also to other deterministic signals.
The steady state probability distribution and mean first passage time of FHN neural system driven by non-Gaussian noise
Authors: Zhao Yan  , Xu Wei  , Zou Shao-Cun  ,   西北工业大学应用数学系，西安  710072
Published: December 2020

We investigated the FitzHugh-Nagumo neural system driven by non-Gaussian noise. The expressions of the stationary probability distribution and the mean first-passage time are obtained through the path-integral approach and the unified colored noise approximation. The results show that the intensity of additive noise can induce phase transition，while the intensity of multiplicative noise，the derivation parameter and the correlation time cannot. The non-Gaussian noise shortens transformation time between resting state and excited state and is beneficial to transmission of information in neural system.
Effect of the period modulation of the correlation intensity between color noises on the stochastic resonance of the single-mode laser with the signal modulation
Authors: Chen De-Yi  , Wang Zhong-Long  ,   三峡大学理学院物理系，宜昌  443002
Published: December 2020

For the laser system in which the correlation intensity between color noises is modulated by the time period，we investigate the stochastic resonance with the signal modulation of the noise. By means of the linear approximation，we calculate the intensity correlation function and signal-to-noise ratio （SNR） and discuss the evolution of the SNR with the noise intensity and self-correlation time of noises and signal frequency and time period modulation frequency. A new stochastic resonance is found. The evolution of the signal-noise ratio with the time period modulation frequency reveals periodic oscillation. We obtain the generalized stochastic resonance, in which the evolution of the signal-noise ratio with the self-correlation time of the pump noises and signal frequency presents the stochastic resonance. The typical stochastic resonance of the signal-noise ratio with the noise intensity is obtained also. The evolution of the signal-noise ratio with the self-correlation time of the quantum noise shows the restrainment.
A secure communication scheme based on parameter identification of first order time-delay chaotic system
Authors: Wang Ming-Jun  , Wang Xing-Yuan  ,   大连理工大学电子与信息工程学院，大连  116024
Published: December 2020

Based on parameter modulation theory，a parameter observer is designed for the first order time-delay Logistic chaotic system. The unknown parameter of this system can be identified by transmitting a single signal，then the useful signal modulated in the parameter will be recovered successfully. By choosing different frequency signals as “0" and “1"，a practical digital secure communications scheme is designed. Numerical simulation shows the effectiveness of the method.
Grüneisen parameter and high temperature and high pressure equation of state for aluminum
Authors: Song Ping  , Cai Ling-Cang  ,   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实验室，绵阳  621900
Published: December 2020

Based on the Gray equation of state，the Grüneisen models of ργ=constant，Gray，GRIZZLY and the Grüneisen parameter calculated from ab initio were used to calculate the melt line, isentropic compression, isotherm compression and isentropic release lines of aluminum. Comparing the calculated lines with the experimental data,the GRIZZLY Grüneisen model was found to be the best model for the equation of state of aluminum in the pressure range of about 500 GPa. The ργ=constant model is not as good as the GRIZZLY model. The Gray model and the Grüneisen parameter calculated ab initio fits the experimental data at high pressure badly.
Two-step growth of superhydrophobic ZnO nanorod array films
Authors: Gong Mao-Gang  , Xu Xiao-Liang  , Cao Zi-Li  , Liu Yuan-Yue  , Zhu Hai-Ming  ,   中国科学院中国科学技术大学结构分析重点实验室,合肥  230026；中国科学技术大学物理系,合肥  230026
Published: December 2020

Well-aligned ZnO nanorod array films (ZnO-NAFs) were coatedon common glass substrate by two-step method. A thin buffer layer of ZnO seeds were first deposited via RF magnetron sputtering,the ZnO-NAFS were then grown in a simple aqueous solution. We report a surface-modification induced hydrophilicity to superhydrophobicity transiton on ZnO-NAFs. The sample was characterized by scanning electron microscopy (SEM). The surfaces of ZnO-NAFs was superhydrophobic with a three-phase contact angle of 151°±0.5°, while the sliding angle is 7°. The superhydrophobicity of ZnO-NAFs was validated by Cassie's model.
Resolution restoration algorithm based on maximum a posteriori from Poisson-Markov distribution and blind multichannel deconvolution
Authors: Chen Yi-Nan  , Jin Wei-Qi  , Zhao Lei  , Zhao Lin  ,   北京理工大学光电工程系,北京  100081
Published: December 2020

Single input multichannel output (SIMO) imaging system which enhances the spatial resolution by resampling the same scene increasingly has large applications, and the corresponding image restoration algorithm for uncontrollable SIMO has became the subject of current research. By the assumptions of Poisson, Markov stochastic field and regulation of improved multichannel constraint, the multichannel blind image reconstruction is proposed based on maximum a posteriori rules. The algorithm doesn't need to know the prior knowledge such as character, type and distribution of the degraded point spread function (PSF) in each channel. The pixels and PSF are projected into the amplitude restrained set and energy invariable set, respectively, and their estimates converge to the global optimum solutions by the alterative iteration, and finally, the super-resolution image is restored. Algorithm simulations and the real micro-shift, micro-defocus experiments indicate that it has good restoration effect and stability at different signal noise ratios and for different PSF supports.
Molecular dynamics simulation of the anisotropy of surface melting of metal Al
Authors: He An-Min  , Qin Cheng-Sen  , Shao Jian-Li  , Wang Pei  ,   北京应用物理与计算数学研究所，北京  100088
Published: December 2020

Molecular dynamics simulations are used to investigate the surface melting processes of three low-index surfaces of aluminum. We find that the surface melting is anisotropic for different surfaces by analyzing the variation of the microstructures during melting. Although （001） and （111） surfaces can both sustain overheating, the microstructures of them are different. There is a thin disordered quasi-liquid film on （001） surface when overheated while the （111） surface is crystalline. It is surprising that the melted （001） surface can be overheated. The velocity of melting is calculated for all the surfaces at different temperatures, and the melting point is extrapolated to be 950 K±9 K which agrees with the experimental data of 9335 K.
The influence of mass center motion on -type three-level atom dynamics
Authors: Hu Xiao-Ping  , Guo Hong  ,   华中师范大学物理科学与技术学院,武汉 430079
Published: December 2020

The system of a single-mode field interacting with a -type three-level atom in a harmonic trap is investigated. The linear entropy of the field, the atomic internal states and the atomic mass center motion are explored. It is shown that the atomic mass center motion not only can affect the linear entropy of the field and the atomic internal states, but also effectively changes their relationship.
X-ray photoelectron spectroscopy analysis of the effect of thickness on the transformation temperature of NiTi alloy thin films
Authors: Li Yong-Hua  , Liu Chang-Sheng  , Meng Fan-Ling  , Wang Yu-Ming  , Zheng Wei-Tao  ,   (1)东北大学材料与冶金学院，沈阳  110004; (2)哈尔滨工程大学理学院，水下智能机器人技术国防科技重点实验室，哈尔滨  150001; (3)哈尔滨工程大学理学院，水下智能机器人技术国防科技重点实验室，哈尔滨  150001；吉林大学材料科学系，汽车材料教育部重点实验室，长春  130012; (4)吉林大学材料科学系，汽车材料教育部重点实验室，长春  130012
Published: December 2020

The effect of thickness on transformation temperature of the NiTi thin films has been studied by X-ray diffraction and X-ray photoelectron spectroscopy. Results show that the crystallization temperature for 3?μm-thick film is higher than that for 18?μm thick film at the same growth temperature and post annealing. With the substrate temperature increasing, the start temperature （As） of austenite phase is lowered after annealing at 763 K for 1?h. There is an oxide layer （TiO2） on the film surface, which prevents the Ni atom from coming onto the surface. There is an oxide layer of a mixture Ti2O3 with NiO on the film /substrate interface. The oxide layers affect the transformation temperature by changing the Ni atomic content in the interior of the film.
Effect of oxygen pressure on the optical properties of ZnO/Si(100) thin films deposited by femtosecond pulse laser
Authors: Yang Yi-Fa  , Li Yu-Hua  , Long Hua  , Lu Pei-Xiang  , Yang Guang  , Zheng Qi-Guang  ,   (1)华中科技大学武汉光电国家实验室,武汉  430074; (2)华中科技大学武汉光电国家实验室,武汉  430074；湖北师范学院物理与电子科学学院,黄石  435002
Published: December 2020

Zinc oxide （ZnO） thin films have been grown on n type Si （100） substrate using femtosecond pulsed laser deposition （PLD）. The effect of change in parameters, including substrate temperature, laser energy and oxygen pressure, on the structure and optical properties of ZnO films is discussed. The Xray diffraction results show that the ZnO films are highly caxis oriented when deposited at substrate temperature of 80?℃ with laser energy of 1\^5?mJ under oxygen pressure of 10 mPa. The field emission scanning electron microscopy indicates that the mean grain size increases with the increase of temperature, but decreases with the increase of laser energy. The ultravioletvisible transmissivity shows that the annealed films have a transmittance of 90% in visible rang. The photoluminescence spectra of ZnO films are discussed. In comparison, the structure and photoluminesceme properties of ZnO films produced by using nanosecond PLD are also studied.
Three-dimensional multi-phase field numerical simulation of the morphology selection of eutectic CBr4-C2Cl6 alloy with different pulling velocities
Authors: Yang Yu-Juan  , Wang Jin-Cheng  , Yang Gen-Cang  , Zhang Yu-Xiang  , Zhu Yao-Chan  ,   西北工业大学凝固技术国家重点实验室，西安  710072
Published: December 2020

By using the KKSO multiphase field model, the fixedvelocity growth and velocitychanging growth of directional solidification for eutectic CBr4C2Cl6 alloys are simulated in three dimensions to reproduce the morphology evolution and selection. The diagram of the eutectic morphology selection is further established. The changes of the average interface velocity and the average interface undercooling during velocitychanging growth are also studied. The simulation results show that the eutectic morphology selections both before and after velocity change are the same as the morphology selection in the case of fixed pulling velocity. For all of the eutectic morphology selections, changes of the average interface velocity and the average interface undercooling show the hysteresis effect. It's also found that the relationship between the average interface velocity and the average interface undercooling is in good agreement with the theoretical prediction.
Rapid fabrication of crystalline films with double layers and dual members by spin-coating method
Authors: Liu Ren-Xiao  , Chen Sheng-Li  , Dong Peng  ,   中国石油大学（北京）重质油国家重点实验室，北京  102249
Published: December 2020

Ordered colloidal particle films with double layers and dual members could be prepared by stepbystep spincoating method. Monolayer film of larger sized PS or SiO2 colloids was utilized as template to selfassemble second layer of SiO2 colloidal particles with smaller diameter. The size ratio γ of smaller and larger colloidal particles was 0.20—0.56 in the composite films. Larger （L） and smaller （S） dual member colloidal particles formed composite crystalline doublelayer films with multifarious arraymodes, whose structures could be expressed as LSx （here, L represents larger sized particles, S represents smaller colloidal particles, and x represents the stoichiometry of larger and smaller colloidal particles）, and x=1, 2, …, 13. The performance of composite colloidal films were influenced mainly by several factors, including spincoating velocity, spincoating time, viscosity of suspension medium, number density of colloidal suspension, and the wetting properties of substrates, etc.. On the prerequisite of complete wetting between colloidal suspension and substrate, appropriate number density of colloidal suspension, velocity and time of spincoating were the necessary conditions for ordered selfassembling to crystalline film of colloidal particles by spincoating method.
Features analysis of seismic wave field in two-phase anisotropic random medium with the pseudo-spectral method
Authors: Li Hong-Xing  , Tao Chun-Hui  ,   (1)东华理工大学核工程技术学院，抚州  344000；国家海洋局海底科学重点实验室，杭州  310012；国家海洋局第二海洋研究所，杭州  310012; (2)国家海洋局海底科学重点实验室，杭州  310012；国家海洋局第二海洋研究所，杭州  310012
Published: December 2020

The anisotropy, twophase pore and nonuniformity must be considered comprehensively in order to describe the oil and gas reservoirs accurately. Consequently a twophase anisotropic random medium model based on the twophase model and random medium theory is presented in this paper. The seismic wavefield numerical modeling was simulated by using the pseudospectral method. The results show that there exist complex wave field features such as wave scattering and traveling time disturbance and these features strongly depend on parameters of the random medium model, the nonuniformity rate mainly impacts the wave traveling time disturbance when spatial scale of nonuniformity is large and mainly impacts wave scattering when spatial scale of nonuniformity is small. The studies make it possible to retrieve the nonuniformity on statistical basis and are useful to understanding more deeply the seismic wave propagation in oil and gas reservoirs.
Study of the ground state wave function in optical lattice by using the genetic algorithm
Authors: Xu Zhi-Jun  , Nie Qing-Miao  , Li Peng-Hua  ,   浙江工业大学应用物理系，杭州  310032
Published: December 2020

Taking the gross-pitaevskii（G-P） mean-field energy functional of Bose condensed gas as the objective function, we study the properties of Bose condensed gas in 1D optical lattice system by using the genetic algorithm, and present a new method to find the ground-state wave function of the system. Through the optimized computation, the currently commonly used Thomas-Fermi approximation and Gaussian approximation model are revised and discussed, and the optimal ground state wave function is given.
Hybrid control of hyperchaotic Lorenz system by constant impulse and adaptation impulse
Authors: Chen Guang-Ping  , Hao Jia-Bo  ,   四川文理学院物理与工程技术系，达州  635000
Published: December 2020

The question about the control of hyper chaotic Lorenz system has been studied, and the method of hybrid control by constant impulse and adaptation impulse has been proposed according to the impulse control principle and the adaptive control policy. The method can extend the range of control parameter that can control the system to periodical orbit. The simulation results showed the effectiveness of this method.
Quantum voting protocol using two-mode squeezed states
Authors: Yi Zhi  , He Guang-Qiang  , Zeng Gui-Hua  ,   上海交通大学电子工程系区域光纤通信网与新型光通信系统国家重点实验室，上海  200240
Published: December 2020

A basic quantum voting protocol using two-mode squeezed states is proposed firstly in this paper. This protocol makes use of the uncertainty principle by using random-selection, possible attack modes are then analyzed. The mode-mode correlation of two-mode squeezed states guarantees the security of the protocol.
Flat broadband chaotic carrier generation and synchronization
Authors: Zhang Xiu-Juan  , Wang Bing-Jie  , Yang Ling-Zhen  , Wang An-Bang  , Guo Dong-Ming  , Wang Yun-Cai  ,   太原理工大学理学院物理系，太原  030024
Published: December 2020

The chaotic carrier with smooth spectrum and broad bandwidth is generated by a distributed feedback （DFB） semiconductor laser subject to unidirectional fiber ring optical feedback. The smooth spectrum of the obtained chaotic carrier hides the external cavity resonance frequency peak，therefore the security of the system is enhanced. By unidirectional coupling，we implement the stable chaos synchronization when the chaotic light is injected into a solitary DFB laser diode. The correlation coefficient of synchronization is 0.84. The effects of injection strength and optical frequency detuning on synchronization are investigated experimentally. The results show that in conditions of strong injected locking the synchronization can be achieved in a large range of frequency detuning，and the stronger injection corresponds to the larger range of frequency detuning in which chaos synchronization maintains. The synchronization quality improves with the injection strength increasing.
Atom-orbital close-coupling calculation of charge exchange processes in collisions of H+ with Li（5d）
Authors: Zhao Yi-Qing  , Liu Ling  , Liu Chun-Lei  , Xue Ping  , Wang Jian-Guo  ,   (1)北京应用物理与计算数学研究所计算物理实验室，北京  100088; (2)清华大学物理系原子分子纳米科学教育部重点实验室，北京  100084
Published: December 2020

The charge exchange process in collisions of H+ with Li （5d） is investigated using the two-center atomic-orbital close-coupling method. The state-selective cross-sections are obtained in the energy range of 0.5—10 keV. It is found that the processes for capture to n=4—7 are the dominant reactions，and the n-distribution of state-selective cross-sections is weakly dependent on the collision energy. But the l-distribution of state-selective cross-sections strongly depends on the collision energy. For the lower collision energy around 1 keV，the l-distribution increases with increasing l. However，the l-distribution moves to the lower quantum number as the collision energy increases，and the maximum value appears around l=1.
Experimental study of radiation temperature for gold hohlraum heated with 1 ns，0.35 μm lasers on SG-Ⅲ prototype laser facility
Authors: Li San-Wei  , Yi Rong-Qing  , Jiang Xiao-Hua  , He Xiao-An  , Chui Yan-Li  , Liu Yong-Gang  , Ding Yong-Kun  , Liu Shen-Ye  , Lan Ke  , Li Yong-Sheng  , Wu Chang-Shu  , Gu Pei-Jun  , Pei Wen-Bing  , He Xian-Tu  ,   (1)北京应用物理与计算数学研究所，北京  100088; (2)中国工程物理研究院激光聚变研究中心，绵阳  621900
Published: December 2020

Experimental measurement of radiation temperature by a streaked optical pyrometer and a soft X-ray spectrometer viewing through the laser entrance hole are performed on SG-Ⅲ prototype laser facility. It was found that the two methods compares well. Using the power balance relation，the laser-hohlraum coupling efficiency for 1.0 mm×1.7 mm hohlraum and 1.0 mm×2.1 mm hohlraum is around 50%—55%.
Optical properties revealing annealing behavior of high-temperature He-implantation induced defects in silicon carbide
Authors: Zhang Hong-Hua  , Zhang Chong-Hong  , Li Bing-Sheng  , Zhou Li-Hong  , Yang Yi-Tao  , Fu Yun-Chong  ,   (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

6H-SiC single crystal specimens were implanted at 600 K with 100 KeV He ions to three successively increasing fluences and subsequently annealed at different temperatures ranging from 600℃ to 1200℃ in vacuum. After the annealing, the samples were investigated by using Raman scattering spectroscopy and photoluminescence spectrometry，respectively. Both of the two methods showed that the damage induced by helium-ion-implantation in the lattice is closely related to the dose. The thermal annealing brings about recovery of the damage，and different levels of damage require different annealing temperature to recover efficiently. It is indicated that different annealing stages involve different mechanisms，corresponding to recombination of point defects，formation of He-vacancy complexes，and nucleation and coarsening of bubbles，respectively. The experimental results indicate that high temperature implantation is an effective way to avoid amorphization of the implanted layer due to damage accumulation. Helium implantation can be used to introduce buried nanoscale cavities as the nucleation site for the buried oxide in a well defined region proposed for an alternative and more economical method of manufacturing SiC-on-Insulator （SiCOI）.
Effect of DC bias on pressure-induced depolarization of Pb（Nb,Zr,Sn,Ti）O3 ceramics
Authors: Dai Zhong- Hua  , Yao Xi  , Xu Zhuo  ,   (1)南昌航空大学材料科学与工程学院,南昌  330063; (2)西安交通大学电子材料研究所,西安  710049
Published: December 2020

The polarization and depolarization of antiferroelectric Pb（Nb,Zr,Sn,Ti）O3 ceramics under dc bias were studied under hydraulic pressure ranging from zero to 250 MPa. It was found that the antiferroelectric ceramic can be induced to a metastable ferroelectric state and that the ceramic at this ferroelectric state can be switched to the antiferroelectric state by using hydraulic pressure. The hydraulic pressure that induces the transition from the ferroelectric to the antiferroelectric states increases with the positive and decreases with the negative dc bias. The electrical energy stored in the poled ceramics at its ferroelectric state releases during the transition from the ferroelectric to antiferroelectric state, which results in a strong current pulse a cross the ceramic. Based on the results, the pressure-electric field phase diagram for polarized PNZST ceramics was established.
Amendment to bertran equation and the weak Fermi resonance characteristic of CS2 in C6H6
Authors: Cao Biao  , Zuo Jian  , Li Zuo-Wei  , Ouyang Shun-Li  , Gao Shu-Qin  , Lu Guo-Hui  , Jiang Yong-Heng  ,   吉林大学超硬材料国家重点实验室,长春  130023
Published: December 2020

The Raman spectra of CS2 in C6H6 is messured and the Fermi resonance of v1—2v2 in solution and in pure CS2 is obvionsly different.The characteristic parameters are calculated by Berttern equation.It was found that with the concentration of CS2 declining,the ratio of the spectral intensity （R=Ｉ655/I796） decreases and the coupling coefficient （Ｗ） raises, and the other parameters also change correspondingly.　The analysis shows that dissipation coefficient of v01 of CS2 is affected by the concentration of C6H6. Asymmetric frequency shift of v01 and 2v02 are observed in experiment,which is explained by amending the Bertran theory. This report has reference value for the molecule spectrum certification and the understanding and use of Fermi resonance theory.
Mid-infrared photoluminescence of PbSe/PbSrSe multiple quantum wells grown by molecular beam epitaxy
Authors: Cai Chun-Feng  , Wu Hui-Zhen  , Si Jian-Xiao  , Sun Yan  , Dai Ning  ,   (1)浙江大学物理系,现代光学国家重点实验室，杭州  310027; (2)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

Mid-Infrared photoluminescence of PbSe/PbSrSe multiple quantum wells （MQWs） grown by molecular beam epitaxy is studied. High-order satellite peaks are observed by high resolution X-ray diffraction, which indicates the quantum well structure has sharp interfaces. Temperature dependence of photoluminescence spectra shows that the MQWs make good confinement of electrons and holes. At the same measurement temperature, the photoluminescence peaks of the MQW sample show a clear blue shift compared with that of the bulk PbSe material. We find that the intensity of photoluminescence is dependent on the measurement temperature. When temperature increases from 150 K to 230 K, the PL intensity reaches its maximum at 230 K, and with further increasing the intensity decreases slowly. We can still observe strong PL intensity above room temperature, which indicates MQWs have the potential to be used in room-temperature_operating mid-infrared optoelectronic devices.
New exotic solitary waves in one type of nonlinear dispersive equations
Authors: Yin Jiu-Li  , Tian Li-Xin  ,   江苏大学非线性科学研究中心,镇江  212013
Published: December 2020

New exotic solitary wave and the painlevé integrability of one type of the nonlinear dispersive generalized DGH equation are studied. By Painlevé analysis, we discover that the nonlinear dispersive generalized DGH equation with m＝2 is integrable, which is a new integrable equation. By the new variable transformation and the auto-Backlund transformation，we obtain abundant exotic solitary wave solutions, such as compactons, peakons, new double solitary waves with peak points, and double solitary waves with blow-up points.
Integration over entangled state projective operators
Authors: Li Ti-Jun  ,   菏泽学院物理系，菏泽  274015
Published: December 2020

In virture of the eigenvalue equations of operators, the entangled states' completeness relation is proved from that of the coherent states, and the integral values of non-symmetric projective operators of entangled states are obtained.
Spin squeezing of two-component Bose-Einstein condensate
Authors: Yan Dong  , Song Li-Jun  , Chen Dian-Wei  ,   (1)长春大学理学院，长春  130022; (2)吉林化工学院理学院，吉林  132022
Published: December 2020

Spin squeezing of two-component Bose-Einstein condensate, which is impacted by the periodic impulses, is investigated. The results show that spin squeezing can reveal the underlying chaotic and regular structures of phase space, namely, spin squeezing vanishes after a very short time for an initial coherent state centred in a chaotic region, but spin squeezing exists for a long time for an initial coherent state centred in a regular region. In particular, with time evolution, distribution and swing of the mean spin direction is closely related to the structure of the space where the initial coherent state centred in. Finally, spin squeezing dynamics of initial states centred in the whole phase space is investigated and a better quantum-classical correspondence is obtained.
Mixture control of chaotic system using particle swarm optimization algorithms and OGY method
Authors: Wang Xiao-Feng  , Xue Hong-Jun  , Si Shou-Kui  , Yao Yue-Ting  ,   (1)海军航空航天大学，烟台  264001; (2)海军驻上海七0四所军事代表室，上海  200031
Published: December 2020

Based on the principle of directing chaotic orbits, the method of directing orbits is proposed using particle swarm algorithms in chaotic control. After the orbits reach the target region, OGY method is then used to make the chaotic systems stabilized to the fixed point. The simulation of Hénon chaotic system indicates that the new method realises better chaotic control.
A fast algorithm for adaptive generalized predictive control of Hénon chaotic systems
Authors: Wen Shu-Huan  , Wang Zhe  , Liu Fu-Cai  ,   燕山大学西校区电院工业计算机控制工程河北省重点实验室，秦皇岛  066004
Published: December 2020

A kind of generalized predictive control fast algorithm with constraint matrix for Hénon chaotic system is proposed. We firstly identify the chaotic system by recursive least squares parameter of forget factor, and then add one kind of constraint matrix to this algorithm. The introduction of the constraint matrix avoids the matrix inversion computation. The method needs smaller computer memory and the computational speed is higher. The abilities of tracking the reference signal and restraining the parameter perturbation and stochastic disturbance are improved. The simulated results show the effectiveness of this algorithm.
Theoretical study on the partial cross section for the second vibrational excitation in He-H2 collisions
Authors: Shen Guang-Xian  , Wang Rong-Kai  , Linghu Rong-Feng  , Yang Xiang-Dong  ,   (1)贵州师范大学物理与电子科学学院,贵阳  550001; (2)四川大学原子与分子物理研究所,成都  610065; (3)四川大学原子与分子物理研究所,成都  610065；贵州师范大学物理与电子科学学院,贵阳  550001
Published: December 2020

Close-coupling method was applied to the 3He（4He,5He）-H2 system, and the second vibrational excitation cross sections of “00-20，00-22，00-24，00-26” at different incident energies have been calculated．By analysing the differences of these partial wave cross sections, the change rules of how the partial wave cross sections change with the mass of isotope atom and the relative kinetic energy of incident atoms are obtained.
Highly charged ion beam-induced size modification of Au nanoparticles
Authors: Xu Zhong-Feng  , Liu Li-Li  , Zhao Yong-Tao  , Chen Liang  , Zhu Jian  , Wang Yu-Yu  , Xiao Guo-Qing  ,   (1)西安交通大学应用物理系，非平衡物质结构及量子调控教育部重点实验室，西安  710049; (2)西安交通大学应用物理系，非平衡物质结构及量子调控教育部重点实验室，西安  710049；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
Published: December 2020

Size modification of Au nanoparticles （NPs）, deposited on the Au-thick film surface, induced by highly charged ions （HCI） 40Ar12+ with fixed low dose （4.3×1011 ions/cm2） but various energyies （ranged from 146.64keV to 290.64keV） at room temperature （293.15K）, was investigated by atomic force microscopy （AFM） and transmission electron microscopy （TEM）. The selected 40Ar12+ beams were provided by electron cyclotron resonance source （ECRIS） of the National Laboratory of the Heavy Ion Research Facility in Lanzhou （HIRFL）. The morphological changes of NPs were interpreted by collisional mixing model, Ostwald ripening （OR） model and inverse Ostwald ripening （IOR） model of spherical NPs on a substrate. Theoretical and experimental studies both prove that there exist the critical energy E*, for low ion energy （EE*）, the mean diameter R of NPs increases with the increasing energy of incident ions E, while for higher projectile energy （E>E*）, it decreases with increasing energy.
Frequency modulation optical feedback characteristics of microchip Nd:YAG lasers with anisotropic external cavity
Authors: Ren Cheng  , Zhang Shu-Lian  ,   清华大学精密测试技术与仪器国家重点实验室,北京  100084
Published: December 2020

Optical feedback characteristics of frequency modulated microchip Nd:YAG lasers with anisotropic external cavity are investigated. With isotropic optical feedback, the modulation frequency of output intensity is proportional to the ratio of external cavity length to internal cavity length. With anisotropic optical feedback, the laser polarization periodically hops between two orthogonal directions with equal bandwidth. The times of polarization flipping in the longitudinal mode bandwidth is proportional to the ratio of external cavity length to internal cavity length, resulting in double frequency of original fringes. The theoretical analysis based on Fabry-Perot cavity equivalent model is in good agreement with the experimental results. The potential applications of this phenomenon in precision measurement are discussed.
Two-wavelength-range whispering-gallery-mode fiber laser pumped by evanescent wave
Authors: Pu Xiao-Yun  , Bai Ran  , Xiang Wen-Li  , Du Fei  , Jiang Nan  ,   云南大学物理系，昆明  650091
Published: December 2020

A cylindrical micro-cavity was made by immersing a silica optical fiber into a low refractive index dye solution.Pumped by evanescent wave along the fiber axis, dye gain was confined in the evanescent field of whispering gallery mode （WGM） of the fiber, which led to a high pumping efficiency and a long gain distance along the fiber axis. When the fiber was immersed into Rhodamine 6G and Rhodamine B dye solution with the same concentration of 8×10-4mol/L but separated to two parts, WGM laser emissions in the wavelength ranges of 567—576nm and 592—600nm were observed; when immersed into Rhodamine B dye solution with two concentrations of 8×10-4 and 8×10-3mol/L, WGM laser emissions in the wavelength ranges of 588—595nm and 600—618nm were observed. WGM laser emission in two different wavelength ranges in a single optical fiber was realised, which formed a new kind of WGM laser, the two-wavelength-range WGM fiber Laser.
Effect of time-dependent ionization on properties of the ultrashort pulse propagation and optical power limiting in a two-photon absorption molecular medium
Authors: Sun Yu-Ping  , Liu Ji-Cai  , Wang Chuan-Kui  ,   山东师范大学物理与电子科学学院,济南  250014
Published: December 2020

By taking the strong two-photon absorption 4,4′-bis （dimethylamino） stilbene molecules as medium, the propagation of femosecond laser pulses in this medium is simulated by numerically solving the Maxwell-Bloch equations using an iterative predictor-corrector and finite-difference time-domain method. The influences of time-dependent ionization on two-photon absorption and optical power limiting behavior are emphatically investigated. The numerical results show that the nonlinear interactions between the pulses and the medium and the corresponding spontaneous emission become weaker when the time-dependent photoionization is considered. The effects of photonionization on the main pulse become more evident as the amplitude of input electric field is increased. When the photonionization cross section is larger, the dynamic optical limiting range becomes broader, which demonstrates that the limited photonionization ability is favorable for the optical power limiting. Furthermore, the propagating-distance dependence of the dynamical behavior of the ultrashort laser pulse in the medium is observed.
Difference in filament and spectrum broadening induced by femtosecond pulses in argon gas with a temperature gradient at different positions
Authors: Cao Shi-Ying  , Song Zhen-Ming  , Qin Yu  , Wang Qing-Yue  , Zhang Zhi-Gang  ,   (1)北京大学信息科学技术学院,量子电子学研究所,北京  100871; (2)北京大学信息科学技术学院,量子电子学研究所,北京  100871；天津大学精密仪器与光电子工程学院超快激光研究室，信息技术科学教育部重点实验室,天津  300072; (3)天津大学精密仪器与光电子工程学院超快激光研究室，信息技术科学教育部重点实验室,天津  300072
Published: December 2020

By increasing the local temperature at different positions along the argon gas-filled tube, the difference in filament and spectrum broadening was compared in this paper. The experimental results show that the filament can be controlled by increasing the local temperature of the gas-filled tube. The best way to realise the maximum of such a influence is to heat at the focus point. Spectrum broadening will be narrow with the increase of the local temperature.
3D material microstructures design and numerical simulation
Authors: Ren Huai-Hui  , Li Xu-Dong  ,   兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,兰州  730050
Published: December 2020

To study the micro-scale mechanical properties and failure behavior, and achieve the goal of “performance-oriented” design of microstructure and material performance prediction, in this study, computer simulation, micromechanics calculation and virtual failure analysis on microstructures of polycrystalline materials with multi-component and multiphase are realised by means of programming and finite element numerical simulation. Under the condition of creating representative volume element of microstructures of polycrystalline material and polycrystalline matrix composite that are constructed by material microstructure computer simulation software ProDesign, and based on the secondary development of the commercial finite element software ABAQUS, numerical calculation of micro-scale mechanics of microstructures is implemented. The results of the numerical simulation can be used to predict material performance, identify “material structure weakness”, evaluate initialization and propagation of microcracks of microstructures for heterogeneous materials and deduce the behavior of “virtual failure” of microstructure.
Monte Carlo simulation of thermophysical properties of Ni-15%Mo alloy melt
Authors: Yao Wen-Jing  , Wang Nan  ,   西北工业大学理学院应用物理系，西安  710072
Published: December 2020

The Monte Carlo method with EAM potential is used to simulate the liquid Ni-15%Mo binary alloy system, from which the thermophysical properties hardly measured by experimental measurement can be obtained. The simulated surface tension of liquid Ni-15%Mo alloy at the melting temperature is 1.918 N/m, and the simulated temperature coefficient of surface tension as a function of temperature is σ=1.918-1.130×10-3（T-Tm） N/m. Based on the simulated surface tension, the variation of viscosity and solute diffusion coefficient within the range of from 1500 K to 2000 K can be deduced. The result of the viscosity is η=0.895exp（2.209×104/RT） mPa·s, that is, the viscosity constant is 0.895 mPa·s, and the apparent activation energy is 2.209×104 J/mol. The diffusion coefficient can then be obtained by the Stokes（Sutherland）-Einstein equation as D=9.803×10-8exp（-3.643×104/RT） m/s2， where the activation energy is 3.643×104 J/mol. From the relationship between system energy and temperature, the specific heat of liquid Ni-15%Mo alloy at different temperatures can be determined to be Cp=37.313-1.425×10-2（T-Tm） J·mol-1·K-1.
Shape changes and melting characteristics of cubic Pt nanoparticle：A molecular dynamics study
Authors: Tian Hui-Chen  , Liu Li  , Wen Yu-Hua  ,   (1)呼伦贝尔学院物理与电子信息学院，呼伦贝尔  021008; (2)呼伦贝尔学院物理与电子信息学院，呼伦贝尔  021008；厦门大学物理系，厦门大学理论物理与天体物理研究所，厦门  361005; (3)厦门大学物理系，厦门大学理论物理与天体物理研究所，厦门  361005
Published: December 2020

Molecular dynamics simulation is used to study the thermal stability of cubic platinum nanoparticle. The simulated results show that the cubic nanoparticle first transforms into the truncated cube enclosed by {111} and {100} facets, and then transforms to the spherical one. Finally, it melts into liquid state. The critical temperature of shape transformation is about 1250 K according to the calculation of statistical radius. Cubic and spherical nanoparticles have the same melting point in spite of their different shapes.
First-principles study of the electronic structure and optical properties of Ba0.5Sr0.5TiO3
Authors: Kong Xiang-Lan  , Hou Qin-Ying  , Su Xi-Yu  , Qi Yan-Hua  , Zhi Xiao-Fen  ,   (1)曲阜师范大学图书馆，曲阜  273165; (2)曲阜师范大学物理工程学院，曲阜  273165
Published: December 2020

The band structure and the optical properties of Ba0.5Sr0.5TiO3 are studied by the first principles method. The results show that the conduction band and the valence band are derived from the hybridization between titanium 3d orbitals and oxygen 2p orbitals. In the conduction band, titanium 3d orbitals play a primary role, while in the valence band, oxygen 2p orbitals play a primary role. The absorption coefficient is as targe as 105cm-1, and the absorption is mainly localised in the low energy region. The refractive index n（0） equals 2.1. Our results are in good agreement with the experimental results.