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Effect of order–disorder transition on thermodynamic and electronic properties of σ and χ phases in W–Re alloy: the first-principles calculation

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Tungsten 2025年第1期7卷 195-213页

作者： Zhi-Peng Zhu Dian Jia William Yi Wang Jun-Lei Yin Xing-Yu Gao shu-feng Yang Hai-feng Song Jin-Shan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical University Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

The Tungsten-Rhenium(W-Re) alloys,celebrated for their high melting point,strength at elevated temperatures,electrical resistivity,and radiation resistance,have been widely utilized in high-temperature components,aerospace,electronics,and nuclear *** constituents of the topologically close-packed(TCP) phases,the sigma phase(σ) and chi phase(χ) formed within W-Re alloys wield considerable influence on the mechanical properties and the stability of the *** calculations were utilized in the present work to explore the structural,thermodynamic,and electronic properties of both ordered and disordered configurations within the σ and χ phases,culminating in a systematic elucidation of the higher phase stability exhibited by the ordered *** is found that the bulk modulus of these two phases is directly proportional to the concentration of Re in the alloy,while the equilibrium volume is inversely *** thermodynamic parameters of the σ and χ phases are calculated via the mean-field potential *** similar trends observed in the isobaric heat capacity,enthalpy increment,and entropy change curves for these two phases suggest they possess comparable thermodynamic *** is noteworthy that the contribution of ionic vibrations predominantly affects the isobaric heat capacity,while the contribution of thermal electronic excitations increases linearly with *** the structure and thermodynamic properties of TCP phases in W-Re alloys at low temperatures has profound significance for optimizing material performance,microstructures features,establishing theoretical foundations,and predicting material behavior.

关键词： First-principles calculations Phase stability TCP phases Thermodynamic properties W–Re alloy

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Iterative subspace matching pursuit for joint sparse recovery

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The Journal of China Universities of Posts and Telecommunications 2023年第2期30卷 26-35页

作者： shu feng Zhang Linghua Ding Yin School of Communications and Information Engineering Nanjing University of Posts and TelecommunicationsNanjing 210003China

Joint sparse recovery(JSR)in compressed sensing(CS)is to simultaneously recover multiple jointly sparse vectors from their incomplete measurements that are conducted based on a common sensing *** this study,the focus is placed on the rank defective case where the number of measurements is limited or the signals are significantly correlated with each ***,an iterative atom refinement process is adopted to estimate part of the atoms of the support ***,the above atoms along with the measurements are used to estimate the remaining *** estimation criteria for atoms are based on the principle of minimum subspace *** numerical experiments were performed in noiseless and noisy scenarios,and results reveal that iterative subspace matching pursuit(ISMP)outperforms other existing algorithms for JSR.

关键词： joint sparse recovery(JSR) multiple measurement vector(MMV) support set estimation compressed sensing(CS)

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Optimization of Resource Allocation in Unmanned Aerial Vehicles Based on Swarm Intelligence Algorithms

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Computers, Materials & Continua 2023年第5期75卷 4341-4355页

作者： Siling feng Yinjie Chen Mengxing Huang feng shu School of Information and Communication Engineering Hainan UniversityNo.58 Renmin AvenueHaikou570228China State Key Laboratory of Marine Resource Utilization in the South China Sea Hainan UniversityNo.58 Renmin AvenueHaikou570228China

Due to their adaptability,Unmanned Aerial Vehicles(UAVs)play an essential role in the Internet of Things(IoT).Using wireless power transfer(WPT)techniques,an UAV can be supplied with energy while in flight,thereby extending the lifetime of this energy-constrained *** paper investigates the optimization of resource allocation in light of the fact that power transfer and data transmission cannot be performed *** this paper,we propose an optimization strategy for the resource allocation of UAVs in sensor communication *** is a practical solution to the problem of marine sensor networks that are located far from shore and have limited power.A corresponding system model is summarized based on the scenario and existing theoretical *** minimum throughputmaximizing object is then formulated as an optimization *** swarm intelligence algorithms are utilized effectively in numerous fields,this paper chose to solve the formed optimization problem using the Harris Hawks Optimization and Whale Optimization *** paper introduces a method for translating multi-decisions into a row vector in order to adapt swarm intelligence algorithms to the problem,as joint time and energy optimization have two sets of *** proposed method performs well in terms of stability and ***,performance is evaluated through numerical *** results demonstrate that the proposed method performs admirably in the given scenario.

关键词： Resource allocation unmanned aerial vehicles harris hawks optimization whale optimization algorithm

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Comparative ultrastructural study of endoplasmic reticulum in colorectal carcinoma cell lines with different degrees of differentiation

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World Journal of Gastroenterology 2000年第4期6卷 569-571页

作者： shu feng Jin Dan Song Microbial Engineering Department Institute of Applied EcologyChinese Academy of SciencesShenyang 110015Liaoning ProvinceChina Key Laboratory of Cell Biology Ministry of Public Health of ChinaChina Medical UniversityShenyang 110001Liaoning ProvinceChina

The endoplasmic reticulum (ER) consists of a complex system of tubules, lamellae, and flattened vesicles, and has a variety of morphologies in different cells. It is believed to play a central role in the biosynthesis of cholesterol, phospholipids, steroids, prostaglandins, membrane and secretory proteins[1]. Cancer cells have different functions and ultrastmcture from their original cells[2-4]. The studies on ER membrane system of cancer cells are of great significance in understanding their malignant behavior. In the present work, the ultrastructural characteristics of ER in human colorectal carcinoma cell lines with different differentiation degrees were investigated.

关键词： colorectal neoplasms endoplasmic reticulum ultrastructure microscopy electron microscopy electron scanning cell differentiation

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Commuting Dual Toeplitz Operators on the Polydisk

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Acta Mathematica Sinica,English Series 2007年第5期23卷 857-868页

作者： Yu feng LU shu Xia SHANG Department of Applied Mathematics Dalian University of Technology Dalian 116024 P. R. China

On the polydisk, the commutativity of dual Toeplitz operators is studied. We obtain characterizations of commuting dual Toeplitz operators, essentially commuting dual Toeplitz operators and essentially semi-commuting ... 详细信息

关键词： dual Toeplitz operators polydisk Bergman space commute maximal ideal space

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EFFICIENT FITTING RANGE FOR GLUCOSE MEASUREMENT WITH OPTICAL COHERENCE TOMOGRAPHY

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Journal of Innovative Optical Health Sciences 2009年第1期2卷 107-115页

作者： shu feng KEHONG YUAN DATIAN YE Graduate School at Shenzhen&Department of Biomedical Engineering Tsinghua University China

Studies of non-invasive glucose measurement with optical coherence tomography(OCT)in tissue-simulating phantoms and biological tissues show that glucose has an effect on the OCT signal *** an efficient fitting range to calculate the OCT signal slope is important because it helps to improve the precision of glucose *** this paper,we study the problem in two ways:(1)scattering-induced change of OCT signal slope versus depth in intralipid suspensions with different concentrations based on Monte Carlo(MC)simulations and experiments and(2)efficient fitting range for glucose measurement in 3%and 10%*** results show that the OCT signal slope expresses a contrary change with scattering coefficient below a certain depth in high intralipid concentrations,so that there is an effective fitting *** an efficient fitting range from 100μm to the effective fitting depth,the precision of glucose measurement can be 4.4mM for 10%intralipid and 2.2mM for 3%intralipid.

关键词： Optical coherence tomography noninvasive glucose measurement multiple scattered photons

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Low-energy electronic properties of a Weyl semimetal quantum dot

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Science China(Physics,Mechanics & Astronomy) 2018年第11期61卷 84-98页

作者： shu-feng Zhang Chang-Wen Zhang Pei-Ji Wang Qing-feng Sun School of Physics and Technology University of Jinan Jinan 250022 China International Center for Quantum Materials School of Physics Peking University Beijing 100871 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China

We investigate the low-energy electronic structure ofa Weyl semimetal quantum dot （QD） with a simple model Hamiltonian with only two Weyl points. Distinguished from the semiconductor and topological insulator QDs, there exist both surface and bulk states near the Fermi level in Weyl semimetal QDs. The surface state, distributed near the side surface of the QD, contributes a circular persistent current, an orbital magnetic moment, and a chiral spin polarization with spin-current locking. There are always surface states even for a strong magnetic field, even though a given surface state gradually evolves into a Landau level with increasing magnetic field. It indicates that these unique properties can be tuned via the QD size. In addition, we show the correspondence to the electronic structures of a three-dimensional Weyl semimetal, such as Wey[ point and Fermi arc. Because a QD has the largest surface-to-volume ratio, it provides a new platform to verify Weyl semimetal by separating and detecting the signals of surface states. Besides, the study of Weyl QDs is also necessary for potential applications in nanoelectronics.

关键词： quantum dot Weyl semimetal Landau quantization

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Effect of nonmetallic inclusions on localized corrosion of spring steel

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International Journal of Minerals,Metallurgy and Materials 2021年第3期28卷 390-397页

作者： Wei-ning Shi shu-feng Yang Jing-she Li School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

Certain inclusions in high-strength 60Si2Mn-Cr spring steel result in poor resistance to localized *** this work,to study the effect of inclusions on the localized corrosion behavior of spring steel,accelerated corrosion tests were performed by immersing spring steel in 3wt%FeCl_(3)solution for different *** results show that severe corrosion occurred in areas of clustered CaS *** inclusions containing Ca and Mg induced the strongest localized corrosion *** the case of(Ca,Mn,Mg)S inclusions,the ability to induce localized corrosion susceptibility is ranked as follows:MgS>CaS>***,CaS,(Ca,Mn)S,and(Ca,Mn,Mg)S inclusions were mainly responsible for inducing environmental embrittlement.

关键词： steel localized corrosion inclusions accelerated corrosion tests

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NUMERICAL SIMULATION OF UNSTEADY FLOW FOR VISCO- ELASTIC FLUID IN AN ECCENTRIC ANNULUS WITH INNER ROD RECIPROCATION

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Journal of Hydrodynamics 2008年第2期20卷 261-266页

作者： HE feng-yun YANG shu-ren Department of Petroleum Engineering Daqing Petroleum Institute Daqing 163318 China

The equation governing the unsteady flow of viscoelastic fluids in an eccentric annulus was derived by using the common conversion Maxwell fluid constitutive equation and then discretized by the control volume method. The velocity distribution of flow field was computed by using the ADI method. The influences of the pressure gradient, eccentricity, stroke length, and stroke frequency on the velocity and flow capacity in the flow field was analyzed. The foundation for further research of the eccentric wear problem of the pumping rod in polymer-flood well was laid.

关键词： polymer-flood well viscoelastic fluid eccentric annulus unsteady flow eccentric wear

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High-performance compensation scheme for frequency-dependent IQ imbalances in OFDM transmitter and receiver

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Journal of Systems Engineering and Electronics 2013年第2期24卷 204-208页

作者： Yan Liang feng shu Yijin Zhang Junhui Zhao School of Electronic Engineering and Optoelectronic Technology Nanjing University of Science and Technology College of Telecommunications & Information Engineering Nanjing University of Posts and Telecommunications National Mobile Communications Research Laboratory Southeast University School of Electronic and Information Engineering Beijing Jiaotong University

An efficient compensation scheme combining a timedomain Gaussian elimination（GE） channel estimator and a frequency-domain GE equalizer is proposed for orthogonal frequency division multiplexing（OFDM） systems with frequencydependent in-phase and quadrature-phase（IQ） imbalances at both transmitter and *** with the traditional least square and least mean square compensation schemes,the proposed compensation scheme achieves the same bit error rate as the ideal IQ branches by using only two training OFDM symbols instead of about 20 OFDM symbols.

关键词： in-phase and quadrature-phase(IQ) imbalance time domain frequency domain least square least mean square Gaussian elimination(GE).

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