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Rare Metals 2021年第12期40卷 3501-3511页

作者： Guo-sheng peng Jun Huang Yi-Cheng Gu Guang-sheng Song School of Materials Science and Engineering Anhui University of TechnologyMa’anshan 243002China Key Laboratory of Green Manufacturing and Surface Technology of Advanced Metal Materials Ministry of EducationAnhui University of TechnologyMa'anshan 243002China

The self-corrosion, electrochemical and discharge behavior of commercial purity Al anode via Mn modification in Al-air battery was studied by the hydrogen evolution, weight loss, electrical conductivity, electrochemical and discharge tests. Results show that the synergetic effects of the dissolved Mn and Mn-modifying Al_(3)Fe intermetallic decrease the weight loss and inhibit the hydrogen evolution of commercial purity Al in Na OH solution when minor Mn is introduced. However, more Mn addition leads to the formation of Al_6Mn intermetallic,which has little effect on the weight loss, but accelerates the hydrogen evolution. Mn introduction plays a positive role in activating Al anodes, resulting in a decrease in the anodic polarization and an increase in the discharge voltage. Among all the commercial purity Al-x Mn anodes, 0.1 wt% Mn addition exhibits the best discharge efficiency for Al-air battery.

关键词： Commercial purity Al Mn addition Corrosion Electrochemical activity Discharge behavior

Angiotensin IV upregulates the activity of protein phosphatase 1α in Neura-2A cells

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Protein & Cell 2013年第7期4卷 520-528页

作者： Dan Wang peng Xue Xiu Lan Chen zhen sheng Xie Fu Quan Yang Li zheng Tao Xu National Key Laboratory of Biomacromolecules Institute of BiophysicsChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Science Beijing 100049China

The peptide angiotensin IV(Ang IV)is a derivative of angiotensin *** insulin regulated amino peptidase(IRAP)has been proposed as a potential receptor for Ang IV,the signalling pathways of Ang IV through IRAP remain *** applied high-resolution mass spectrometry to perform a systemic quantitative phosphoproteome of Neura-2A(N2A)cells treated with and without Ang IV us-ing sta ble-isotope labeling by amino acids in cell culture(SILAC),and identifi ed a reduction in the phosphorylation of a major Ser/Thr protein phosphorylase 1(PP1)upon Ang IV *** addition,spinophilin(spn),a PP1 reg-ulatory protein that plays important functions in the neural system,was expressed at higher *** revealed decreased phosphorylation of p70S6 kinase(p70S6K)and the major cell cycle modulator retinoblas-toma protein(pRB).These changes are consistent with an observed decrease in cell *** together,our study suggests that Ang IV functions via regulating the activity of PP1.

关键词： angiotensin IV PP1α cell proliferation p70S6 kinase spinophilin

Analysis of Synonymous Codon Usage Bias in 09H1N1

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Virologica Sinica 2010年第5期25卷 329-340页

作者： zhen-peng LI De-quan YING peng LI Fei LI Xiao-chen BO sheng-qi WANG Beijing Institute of Radiation Medicine Beijing 100850 China

A novel subtype of influenza A virus 09H1N1 has rapidly spread across the world. Evolutionary analyses of this virus have revealed that 09H1N1 is a triple reassortant of segments from swine, avian and human influenza viruses. In this study, we investigated factors shaping the codon usage bias of 09H1N1 and carried out cluster analysis of 60 strains of influenza A virus from different subtypes based on their codon usage bias. We discovered that more preferentially used codons of 09H1N1 are A-ended or U-ended, and the intra-genomic codon usage bias of 09H1N1 is quite low. Base composition constraint, dinucleotide biases and translational selection are the main factors influencing the codon usage bias of 09H1N1. At the genome level, we find that the codon usage bias of 09H1N1 is similar to H1N1 (A/swine/Kansas/77778/2007H1N1), H9N2 from Asia, H1N2 from Asia and North America and H3N2 from North America. Our results provide insight for understanding the processes governing evolution, regulation of gene expression, and revealing the evolution of 09H1N1.

关键词： 09H1N1 Correspondence analysis Codon usage bias

Conditional Connectivity of Bubble Sort Graphs

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Acta Mathematicae Applicatae Sinica 2017年第4期33卷 933-944页

作者： Ling-sheng SHI peng WU Department of Mathematical Sciences Tsinghua University Beijing 100084 China

A subset F V（G） is called an Rk-vertex-cut of a graph G if G - F is disconnected and each vertex of G - F has at least k neighbors in G - F. The Rk-vertex-connectivity of G, denoted by κk（G）, is the cardinality of a minimum Rk-vertex-cut of G. Let Bn be the bubble sort graph of dimension n. It is known that κk（Bn） = 2k（n - k - 1） for n _〉 2k and k = 1,2. In this paper, we prove it for k =3 and conjecture that it is true for all k ∈ N. We also prove that the connectivity cannot be more than conjectured.

关键词： bubble sort graph connectivity cut

Ultraviolet discharges from a radio-frequency system for potential biological/chemical applications

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Chinese Physics B 2017年第8期26卷 157-161页

作者： Joseph Ametepe sheng peng Dennis Manos Georgia Gwinnett College School of Science and TechnologyLawrenceville-GA 30078USA EXFO Mississaugaon Canada L5N 6H7 College of William and Mary Department of PhysicsWilliamsburgVA 2385USA

In this work, we describe a new electrode-less radio-frequency（RF） excitation technique for generating excimers in the vacuum ultraviolet（VUV） and ultraviolet（UV） spectral regions for potential biological/chemical applications. Spectra data of Xe~＊_2, XeI~＊, and KrI~＊ generated by this new technique are presented. Optical efficiency of the lamp system ranges from 3% to 6% for KrI~＊, 7% to 13% for XeI~＊, and 15% to 20% for Xe~＊_2. Also, results of irradiating E-coli with XeI~＊discharge from this lamp system is presented to show one of the promising applications of such electrode-less *** new RF lamp system offers an interesting addition to the already existing technologies for generating VUV and UV light for various biological, physical, and chemical processes especially those requiring large area for high productivity.

关键词： radio-frequency ultraviolet light Xe2* XeI* KrI* excimers escherichia coli

Surrogate modeling for unsaturated infiltration via the physics and equality-constrained artificial neural networks

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第6期16卷 2282-2295页

作者： peng Lan Jingjing Su sheng Zhang School of Civil Engineering Central South UniversityChangsha410075China Discipline of Civil Surveying and Environmental EngineeringPriority Research Centre for Geotechnical Science and EngineeringThe University of NewcastleCallaghanNSW2308Australia Qinghai University Qinghai810016China

Machine learning(ML)provides a new surrogate method for investigating groundwater flow dynamics in unsaturated *** pure data-driven methods(*** neural network,DNN)can provide rapid predictions,but they do require sufficient on-site data for accurate training,and lack interpretability to the physical processes within the *** this paper,we provide a physics and equalityconstrained artificial neural network(PECANN),to derive unsaturated infiltration solutions with a small amount of initial and boundary *** takes the physics-informed neural network(PINN)as a foundation,encodes the unsaturated infiltration physical laws(*** equation,RE)into the loss function,and uses the augmented Lagrangian method to constrain the learning process of the solutions of RE by adding stronger penalty for the initial and boundary *** unsaturated infiltration cases are designed to test the training performance of PECANN,***-dimensional(1D)steady-state unsaturated infiltration,1D transient-state infiltration,two-dimensional(2D)transient-state infiltration,and 1D coupled unsaturated infiltration and *** predicted results of PECANN are compared with the finite difference solutions or analytical *** results indicate that PECANN can accurately capture the variations of pressure head during the unsaturated infiltration,and present higher precision and robustness than DNN and *** is also revealed that PECANN can achieve the same accuracy as the finite difference method with fewer initial and boundary training ***,we investigate the effect of the hyperparameters of PECANN on solving RE *** provides an effective tool for simulating unsaturated infiltration.

关键词： Richards equation(RE) Unsaturated infiltration Data-driven solutions Numerical modeling Machine learning(ML)

Second-order Optimality Conditions for Cone-subarcwise Connected Set-valued Optimization Problems

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Acta Mathematicae Applicatae Sinica 2018年第1期34卷 183-196页

作者： zhen-hua peng Yi-hong XU Department of Mathematics Nanchang University

The concept of a cone subarcwise connected set-valued map is introduced. Several examples are given to illustrate that the cone subarcwise connected set-valued map is a proper generalization of the cone arcwise connected set-valued map, as well as the arcwise connected set is a proper generalization of the convex set,respectively. Then, by virtue of the generalized second-order contingent epiderivative, second-order necessary optimality conditions are established for a point pair to be a local global proper efficient element of set-valued optimization problems. When objective function is cone subarcwise connected, a second-order sufficient optimality condition is also obtained for a point pair to be a global proper efficient element of set-valued optimization problems.

关键词： cone subarcwise connected set-valued map generalized contingent epiderivative global proper efficiency optimality condition

Preparation and microwave absorption properties of Ni(Co/Zn/Cu)Fe_2O_4/SiC@SiO_2 composites

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Rare Metals 2019年第1期38卷 59-63页

作者： peng Wang Ping-An Liu sheng Ye School of Materials Science and Engineering South China University of Technology

Ni(Co/Zn/Cu)Fe_2O_4/SiC@SiO_2, a microwave absorber, was prepared by the sol-gel method. The phase structure and the morphology of the microwave absorbers were characterized by X-Ray Diffraction(XRD) and scanning electron microscopy(SEM), respectively. Laser sizer(LS) and X-ray photoelectron spectroscopy(XPS) analysis show the core-shell structure of SiC@SiO_2. Coaxial method was used to measure the microwave absorption properties of the prepared composites in the frequency range of 2-18 GHz. When 70 wt% SiC is wrapped by 30 wt% SiO_2,and 50 wt% NiFe_2O_4 is added into 50 wt% SiC@SiO_2, the as-prepared powders are found to have advanced microwave absorption properties with a minimum reflection loss(RL) of -32.26 dB at about 6.08 GHz, and the available bandwidth is approximately 2.1 GHz when the RL is below -10 dB.

关键词： Ni(Co/Zn/Cu)Fe2O4/SiC@SiO2 Microwave absorption property: Sol-gel method Core-shell structure

Short-Term Wind Power Prediction Based on WVMD and Spatio-Temporal Dual-Stream Network

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Computers, Materials & Continua 2024年第10期81卷 549-566页

作者： Yingnan Zhao Yuyuan Ruan zhen peng School of Computer and Science Nanjing University of Information Science and TechnologyNanjing210044China

As the penetration ratio of wind power in active distribution networks continues to increase,the system exhibits some characteristics such as randomness and *** and accurate short-term wind power prediction is essential for algorithms like scheduling and optimization *** on the spatio-temporal features of Numerical Weather Prediction(NWP)data,it proposes the WVMD_DSN(Whale Optimization Algorithm,Variational Mode Decomposition,Dual Stream Network)*** model first applies Pearson correlation coefficient(PCC)to choose some NWP features with strong correlation to wind power to form the feature ***,it decomposes the feature set using Variational Mode Decomposition(VMD)to eliminate the nonstationarity and obtains Intrinsic Mode Functions(IMFs).Here Whale Optimization Algorithm(WOA)is applied to optimise the key parameters of VMD,namely the number of mode components K and penalty factor ***,incorporating attention mechanism(AM),Squeeze-Excitation Network(SENet),and Bidirectional Gated Recurrent Unit(BiGRU),it constructs the dual-stream network(DSN)for short-term wind power *** experiments demonstrate that the WVMD_DSN model outperforms existing baseline algorithms and exhibits good generalization *** relevant code is available at https://***/ruanyuyuan/***(accessed on 20 August 2024).

关键词： Wind power prediction dual-stream network variational mode decomposition(VMD) whale optimization algorithm(WOA)

A Large Range Flexure-Based Servo System Supporting Precision Additive Manufacturing

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Engineering 2017年第5期3卷 708-715页

作者： zhen Zhang peng Yan Guangbo Hao State Key Laboratory of Tribology & Institute of Manufacturing Engineering Tsinghua University Beijing 100084 China Beijing Key Laboratory of Precision/Ultra-Precision Manufacturing Equipment and Control Tsinghua University Beijing 100084 China Department of Mechanical Engineering Tsinghua University Beijing 100084 China Key Laboratory of High-Efficiency and Clean Mechanical Manufacturing Ministry of Education School of Mechanical Engineering Shandong UniversityJinan 250061 China Department of Electrical and Electronic Engineering University College Cork Cork Ireland

This paper presents the design, development, and control of a large range beam flexure-based nano servo system for the micro-stereolithography （MSL） process. As a key enabler of high accuracy in this process, a compact desktop-size beam flexure-based nanopositioner was designed with millimeter range and nanometric motion quality. This beam flexure-based motion system is highly suitable for harsh operation conditions, as no assembly or maintenance is required during the operation. From a mechanism design viewpoint, a mirror-symmetric arrangement and appropriate redundant constraints are crucial to reduce undesired parasitic motion. Detailed finite element analysis （FEA） was conducted and showed satisfactory mechanical features. With the identified dynamic models of the nanopositioner, real-time control strategies were designed and implemented into the monolithically fabricated prototype system, demonstrating the enhanced tracking capability of the MSL process. The servo system has both a millimeter operating range and a root mean square （RMS） tracking error of about 80 nm for a circular traiectorv.

关键词： Precision additive manufacturing Micro-stereolithography Nanopositioning Beam flexure