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Chinese Physics B

Resumen/Descripción – provisto por la editorial en inglés
Chinese Physics B covers the latest developments and achievements in all branches of physics. Articles, including papers and rapid communications, are those approved as creative contributions to the whole discipline of physics and of significance to their own fields.
Palabras clave – provistas por la editorial

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Historia

Continúa: Chinese Physics

Disponibilidad
Institución detectada Período Navegá Descargá Solicitá
No detectada desde ene. 2008 / hasta dic. 2023 IOPScience

Información

Tipo de recurso:

revistas

ISSN impreso

1674-1056

Editor responsable

Chinese Physical Society (CPS)

País de edición

China

Fecha de publicación

Cobertura temática

Tabla de contenidos

An apodized cubic phase mask used in a wavefront coding system to extend the depth of field

Lina Zhu; Fei Li; Zeyu Huang; Tingyu Zhao

<jats:p>The point spread function (PSF) caused by a wavefront coding system with a cubic phase mask has big side-lobes which leads to bad image restoration. This paper proposes a novel apodized cubic phase mask to suppress the side-lobes of the PSF. Simulated annealing algorithm is used to optimize the cubic and the truncation parameter of the phase mask. The system with the novel phase mask has better performance in the modulation transfer function (MTF) especially in low-and-medium spatial frequency region. The simulation results show that the restored images with the novel phase mask are superior to the one with the classic cubic phase mask in contrast and ringing effect. The experimental results show that the side-lobes of the PSF are suppressed by using the apodized cubic phase mask.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 054217

Analysis on vibration characteristics of large-size rectangular piezoelectric composite plate based on quasi-periodic phononic crystal structure

Li-Qing Hu; Sha Wang; Shu-Yu Lin

<jats:p>Based on the theory of composite materials and phononic crystals (PCs), a large-size rectangular piezoelectric composite plate with the quasi-periodic PC structure composed of PZT-4 and epoxy is proposed in this paper. This PC structure can suppress the transverse vibration of the piezoelectric composite plate so that the thickness mode is purer and the thickness vibration amplitude is more uniform. Firstly, the vibration of the model is analyzed theoretically, the electromechanical equivalent circuit diagram of three-dimensional coupled vibration is established, and the resonance frequency equation is derived. The effects of the length, width, and thickness of the piezoelectric composite plate at the resonant frequency are obtained by the analytical method and the finite element method, the effective electromechanical coupling coefficient is also analyzed. The results show that the resonant frequency can be changed regularly and the electromechanical conversion can be improved by adjusting the size of the rectangular piezoelectric plate. The effect of the volume fraction of the scatterer on the resonant frequency in the thickness direction is studied by the finite element method. The band gap in <jats:italic>X</jats:italic> and <jats:italic>Y</jats:italic> directions of large-size rectangular piezoelectric plate with quasi-periodic PC structures are calculated. The results show that the theoretical results are in good agreement with the simulation results. When the resonance frequency is in the band gap, the decoupling phenomenon occurs, and then the vibration mode in the thickness direction is purer.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 054302

Crown evolution kinematics of a camellia oil droplet impacting on a liquid layer

Zhongyu Shi; Guanqing Wang; Xiangxiang Chen; Lu Wang; Ning Ding; Jiangrong Xu

<jats:p>The phenomenon of droplet impact on an immiscible liquid is encountered in a variety of scenarios in nature and industrial production. Despite exhaustive research, it is not fully clear how the immiscibility of the liquid on which a droplet impacts affects the crown evolution. The present work experimentally investigates the evolution kinematics of a crown formed by the normal impact of a camellia oil droplet on an immiscible water layer. Based on discussion of dynamic impact behaviors for three critical Weber numbers (<jats:italic>We</jats:italic>), the radius of the crown and its average spreading velocity are compared with those of previous theoretical models to discuss their applicability to the immiscible liquid. The evolution kinematics (morphology and velocity) are analyzed by considering the effects of the <jats:italic>We</jats:italic> and layer thickness. Furthermore, the ability of crown expansion in radial and vertical directions is characterized by a velocity ratio. The results show that our experimental crown radius still follows a square-root function of evolution time, which agrees with the theoretical predictions. The dimensionless average spreading velocity decreases with <jats:italic>We</jats:italic> and follows a multivariate power law, while the dimensionless average rising velocity remains constant. The velocity ratio is shown to linearly increase with <jats:italic>We</jats:italic>, demonstrating that the rising movement in crown evolution gradually enhances with <jats:italic>We</jats:italic>. These results are helpful for further investigation on the droplet impact on an immiscible liquid layer.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 054701

Effects of Landau damping and collision on stimulated Raman scattering with various phase-space distributions

Shanxiu Xie; Yong Chen; Junchen Ye; Yugu Chen; Na Peng; Chengzhuo Xiao

<jats:p>Stimulated Raman scattering (SRS) is one of the main instabilities affecting success of fusion ignition. Here, we study the relationship between Raman growth and Landau damping with various distribution functions combining the analytic formulas and Vlasov simulations. The Landau damping obtained by Vlasov–Poisson simulation and Raman growth rate obtained by Vlasov–Maxwell simulation are anti-correlated, which is consistent with our theoretical analysis quantitatively. Maxwellian distribution, flattened distribution, and bi-Maxwellian distribution are studied in detail, which represent three typical stages of SRS. We also demonstrate the effects of plateau width, hot-electron fraction, hot-to-cold electron temperature ratio, and collisional damping on the Landau damping and growth rate. They gives us a deep understanding of SRS and possible ways to mitigate SRS through manipulating distribution functions to a high Landau damping regime.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 055201

Temperature dependence of bismuth structures under high pressure

Xiaobing Fan; Shikai Xiang; Lingcang Cai

<jats:p>It is unclear whether there is a liquid–liquid phase transition or not in the bismuth melt at high temperature and high pressure. If so, it will be necessary to confirm the boundary of the liquid–liquid phase transition and clarify whether it is a first-order phase transition. Here, based on x-ray absorption spectra and simulations, the temperature dependence of bismuth structures is investigated under different pressures. According to the similarity of characteristic peaks of x-ray absorption near edge structure (XANES) spectra, we estimate the possible temperature ranges of liquid–liquid phase transition to be 779–799 K at 2.74 GPa and 859–879 K at 2.78 GPa, 809–819 K at 3.38 GPa and 829–839 K at 3.39 GPa and 729–739 K at 4.78 GPa. Using <jats:italic>ab initio</jats:italic> molecular dynamics (AIMD) simulations, we obtain the stable structures of the bismuth melt at different temperatures and pressures, and calculated their electronic structures. Meanwhile, two stable phases (phase III-like and phase IV-like) of bismuth melts are obtained from different initial phases of bismuth solids (phase III and phase IV) under the same condition (3.20 GPa and 800 K). Assuming that the bismuth melt undergoes a phase transition from IV-like to III-like between 809 K and 819 K at 3.38 GPa, the calculated electronic structures are consistent with the XANES spectra, which provides a possible explanation for the first-order liquid–liquid phase transition.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 056101

Small-angle neutron scattering study on the stability of oxide nanoparticles in long-term thermally aged 9Cr-oxide dispersion strengthened steel

Peng-Lin Gao; Jian Gong; Qiang Tian; Gung-Ai Sun; Hai-Yang Yan; Liang Chen; Liang-Fei Bai; Zhi-Meng Guo; Xin Ju

<jats:p>A 9Cr-oxide dispersion strengthened (ODS) steel was thermally aged at 873 K for up to 5000 h. The size distribution and chemical composition of the dispersed oxide nanoparticles were analyzed by small-angle neutron scattering under a magnetic field. Combined with transmission electron microscopy, Vickers micro-hardness tests and electron backscattered diffraction measurements, all the results showed that the thermal treatment had little or no effect on the size distributions and volume fractions of the oxide nanoparticles in the ferromagnetic matrix, which suggested excellent thermal stability of the 9Cr-ODS steel.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 056102

Structural and thermodynamic properties of inhomogeneous fluids in rectangular corrugated nano-pores

Yanshuang Kang; Haijun Wang; Zongli Sun

<jats:p>Based on the free-energy average method, an area-weighted effective potential is derived for rectangular corrugated nano-pore. With the obtained potential, classical density functional theory is employed to investigate the structural and thermodynamic properties of confined Lennard–Jones fluid in rectangular corrugated slit pores. Firstly, influence of pore geometry on the adsorptive potential is calculated and analyzed. Further, thermodynamic properties including excess adsorption, solvation force, surface free energy and thermodynamic response functions are systematically investigated. It is found that pore geometry can largely modulate the structure of the confined fluids, which in turn influences other thermodynamic properties. In addition, the results show that different geometric elements have different influences on the confined fluids. The work provides an effective route to investigate the effect of roughness on confined fluids. It is expected to shed light on further understanding about interfacial phenomena near rough walls, and then provide useful clues for the design and characterization of novel materials.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 056104

Alloying and magnetic disordering effects on phase stability of Co2 Y Ga (Y = Cr, V, and Ni) alloys: A first-principles study

Chun-Mei Li; Shun-Jie Yang; Jin-Ping Zhou

<jats:p>The alloying and magnetic disordering effects on site occupation, elastic property, and phase stability of Co<jats:sub>2</jats:sub> <jats:italic>Y</jats:italic>Ga (<jats:italic>Y</jats:italic> = Cr, V, and Ni) shape memory alloys are systematically investigated using the first-principles exact muffin-tin orbitals method. It is shown that with the increasing magnetic disordering degree <jats:italic>y</jats:italic>, their tetragonal shear elastic constant <jats:italic>C</jats:italic>′ (i.e., (<jats:italic>C</jats:italic> <jats:sub>11</jats:sub> – <jats:italic>C</jats:italic> <jats:sub>12</jats:sub>)/2) of the <jats:italic>L</jats:italic>2<jats:sub>1</jats:sub> phase decreases whereas the elastic anisotropy <jats:italic>A</jats:italic> increases, and upon tetragonal distortions the cubic phase gets more and more unstable. Co<jats:sub>2</jats:sub>CrGa and Co<jats:sub>2</jats:sub>VGa alloys with <jats:italic>y</jats:italic> ≥ 0.2 thus can show the martensitic transformation (MT) from <jats:italic>L</jats:italic>2<jats:sub>1</jats:sub> to <jats:italic>D</jats:italic>0<jats:sub>22</jats:sub> as well as Co<jats:sub>2</jats:sub>NiGa. In off-stoichiometric alloys, the site preference is controlled by both the alloying and magnetic effects. At the ferromagnetism state, the excessive Ga atoms always tend to take the <jats:italic>Y</jats:italic> sublattices, whereas the excessive Co atom favor the <jats:italic>Y</jats:italic> sites when <jats:italic>Y</jats:italic> = Cr, and the excessive <jats:italic>Y</jats:italic> atoms prefer the Co sites when <jats:italic>Y</jats:italic> = Ni. The Ga-deficient <jats:italic>Y</jats:italic> = V alloys can also occur the MT at the ferromagnetism state by means of Co or V doping, and the MT temperature <jats:italic>T</jats:italic> <jats:sub>M</jats:sub> should increase with their addition. In the corresponding ferromagnetism <jats:italic>Y</jats:italic> = Cr alloys, nevertheless, with Co or Cr substituting for Ga, the reentrant MT (RMT) from <jats:italic>D</jats:italic>0<jats:sub>22</jats:sub> to <jats:italic>L</jats:italic>2<jats:sub>1</jats:sub> is promoted and then <jats:italic>T</jats:italic> <jats:sub>M</jats:sub> for the RMT should decrease. The alloying effect on the MT of these alloys is finally well explained by means of the Jahn–Teller effect at the paramagnetic state. At the ferromagnetism state, it may originate from the competition between the austenite and martensite about their strength of the covalent banding between Co and Ga as well as <jats:italic>Y</jats:italic> and Ga.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 056105

Strategy to mitigate single event upset in 14-nm CMOS bulk FinFET technology

Dong-Qing Li; Tian-Qi Liu; Pei-Xiong Zhao; Zhen-Yu Wu; Tie-Shan Wang; Jie Liu

<jats:p>Three-dimensional (3D) TCAD simulations demonstrate that reducing the distance between the well boundary and N-channel metal–oxide semiconductor (NMOS) transistor or P-channel metal–oxide semiconductor (PMOS) transistor can mitigate the cross section of single event upset (SEU) in 14-nm complementary metal–oxide semiconductor (CMOS) bulk FinFET technology. The competition of charge collection between well boundary and sensitive nodes, the enhanced restoring currents and the change of bipolar effect are responsible for the decrease of SEU cross section. Unlike dual-interlock cell (DICE) design, this approach is more effective under heavy ion irradiation of higher LET, in the presence of enough taps to ensure the rapid recovery of well potential. Besides, the feasibility of this method and its effectiveness with feature size scaling down are discussed.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 056106

Combined effects of cycling endurance and total ionizing dose on floating gate memory cells

Si-De Song; Guo-Zhu Liu; Qi He; Xiang Gu; Gen-Shen Hong; Jian-Wei Wu

<jats:p>The combined effects of cycling endurance and radiation on floating gate memory cell are investigated in detail, and the obtained results are listed below. (i) The programmed flash cells with a prior appropriate number of program and easing cycling stress exhibit much smaller threshold voltage shift than without those in response to radiation, which is ascribed mainly to the recombination of trapped electrons (introduced by cycling stress) and trapped holes (introduced by irradiation) in the oxide surrounding the floating gate. (ii) The radiation induced transconductance degradation in prior cycled flash cell is more severe than those without cycling stress in the programmed state or erased state. (iii) Radiation is more likely to set up the interface generation in programmed state than in erased state. This paper will be useful in understanding the issues involved in cycling endurance and radiation effects as well as in designing radiation hardened floating gate memory cells.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 056107