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Mechanisms of root-soil reinforcement in bioembankments of sloping farmland in the purple hilly area,China

Journal of Mountain Science 2019年第10期16卷 2285-2298页

作者： JIN Hui-fang SHI Dong-mei ZENG Xiao-ying wang san-shu DUAN Teng LOU Yi-bao College of Resources and Environment Institute of Soil and Water Conservation and Eco-environmentSouthwestUniversityChongqing400715China Chongqing Institute of Forest Science Chongqing400036China Chongqing Surveying and Design Institute of Water Resources Electric Power and ArchitectureChongqing400020China

Bio-embankment is an important soil and water conservation measure in the purple hilly area in China,which can effectively improve the ability of cultivated soil layers to resist rainfall erosion and runoff *** contrast,the ecological effect of bioembankment depends on the stability of the earth *** the natural grass bank as a control(CK),the root distribution,root tensile properties and shear resistance of root-soil composites for 3 typical soil and water conservation bio-embankments,namely,Morus alba Linn(Morns),Zanthoxylum bungeanum Maxim(Zanthoxylum)and Medicago sativa(Medicago)were *** results included the following:(1)The root system of the bio-embankments generally decreased in extent with the soil depth;fine roots in the o-io cm depth were most prevalent and significantly higher than those at the other depths,and coarse roots were mainly distributed in the o-30cm layer.(2)The stress-strain curves of the roots of each bio-embankment were single-peak curves without clear strain softening *** smaller the root diameters were,the smoother the stress-strain curves,and the lower the capability of the earth bank to resist *** larger the root diameters were,the lower the tensile *** average root tensile force was highest for Zanthoxylum(73.91 N),followed by Medicago(68.07N)and Morus(61.88 N),and the average root tensile strength showed the same trend,16.52 MPa for Zanthoxylum,16.08 MPa for Medicago and 13.02MPa for Morus.(3)The bio-embankment measures significantly improved the soil shear resistance,especially under vertical loads of 1oo kPa and *** soil internal friction angle showed a significant log-positive correlation with root morphological parameters of root length density(RLD),root surface area density(RSAD) and rootweight density(RWD),while the soil cohesion force showed a positive linear correlation with these *** results provide effective parameters supporting for the design of bio-embankm

关键词： Bio-embankments Root distribution Tensile properties Shear strength Earth bank collapse Purple hilly area

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基于KF的自平衡机器人姿态角补偿方法

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北京理工大学学报 2012年第1期32卷 28-32页

作者：李潮全高学山王树三李科杰北京理工大学智能机器人研究所北京100081 哈尔滨工业大学机器人技术与系统国家重点实验室黑龙江哈尔滨150080 中国航天技术研究院200厂北京100854

研究基于卡尔曼滤波(KF)的低通滤波补偿方法,对采用单轴加速度计的自平衡机器人姿态角测量系统进行补偿,消除由于振动、冲击等引起的信号失真,增强控制系统的稳定性.根据前期研究及实验,深入分析振动、冲击对传感器信号的影响,提出了一... 详细信息

研究基于卡尔曼滤波(KF)的低通滤波补偿方法,对采用单轴加速度计的自平衡机器人姿态角测量系统进行补偿,消除由于振动、冲击等引起的信号失真,增强控制系统的稳定性.根据前期研究及实验,深入分析振动、冲击对传感器信号的影响,提出了一种基于最小二乘拟合原理的姿态角计算模型.在获得机器人自由振荡频率的基础上,设计了基于KF的混合低通滤波单元,并进行了物理模型实验.结果表明,该补偿方法能完全消除振动造成的传感信号失真.此外,该补偿方法对强烈冲击所造成的信号波动亦有明显衰减,能显著提升自平衡机器人的稳定性.

关键词：自平衡机器人姿态角信号 KF混合滤波补偿

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NUMERICAL PREDICTION OF PROPELLER EXCITED ACOUSTIC RESPONSE OF SUBMARINE STRUCTURE BASED ON CFD,FEM AND BEM

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Journal of Hydrodynamics 2012年第2期24卷 207-216页

作者： WEI Ying-san wang Yong-sheng CHANG shu-ping FU Jian Department of Mechanical Engineering Naval University of EngineeringWuhan 430033China

A mesh-less Refined Integral Algorithm （RIA） of Boundary Element Method （BEM） is proposed to accurately solve the Helmholtz Integral Equation （HIE）.The convergence behavior and the practicability of the method are *** Fluid Dynamics （CFD）,Finite Element Method （FEM） and RIA are used to predict the propeller excited underwater noise of the submarine hull *** the propeller and submarine＇s flows are independently validated,then the self propulsion of the ＂submarine＋propeller＂ system is simulated via CFD and the balanced point of the system is determined as well as the self propulsion ***,the transient response of the ＂submarine＋ propeller＂ system is analyzed at the balanced point,and the propeller thrust and torque excitations are *** the thrust and the torque excitations of the propeller are loaded on the submarine,respectively,to calculate the acoustic response,and the sound power and the main peak frequencies are *** show that：（1） the thrust mainly excites the submarine axial mode and the high frequency area appears at the two conical-type ends,while the torque mainly excites the circumferential mode and the high frequency area appears at the broadside of the cylindrical section,but with rather smaller sound power and radiation efficiency than the former,（2） the main sound source appears at BPF and 2BPF and comes from the harmonic propeller ***,the main attention should be paid on the thrust excitation control for the sound reduction of the propeller excited submarine structure.

关键词： submarine propeller excitation self propulsion underwater noise Computational Fluid Dynamics (CFD) Finite Element Method (FEM) and Refined Integral Algorithm (RIA)

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Enhancing thermoelectric performance of p-type SnTe through manipulating energy band structures and decreasing electronic thermal conductivity

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Rare Metals 2024年第7期43卷 3232-3241页

作者： Xin Qian Hao-Ran Guo Jia-Xin Lyu Bang-Fu Ding Xing-Yuan san Xiao Zhang Jiang-Long wang shu-Fang wang Hebei Key Lab of Optic-Electronic Information and Materials College of Physics Science and TechnologyHebei UniversityBaoding 071002China College of Electron and Information Engineering Hebei UniversityBaoding 071002China Research Institute for Frontier Science Beihang UniversityBeijing100191China

SnTe has received considerable attention as an environmentally friendly alternative to the representative thermoelectric material of ***,excessive hole carrier concentration in SnTe results in an extremely low Seebeck coefficient and high thermal conductivity,which makes it exhibit relatively inferior thermoelectric *** this work,the thermoelectric performance of p-type SnTe is enhanced through regulating its energy band structures and reducing its electronic thermal conductivity by combining Bi doping with CdSe ***,the carrier concentration of SnTe is successfully suppressed via Bi doping,which significantly decreases the electronic thermal ***,the convergence and flattening of the valence bands by alloying CdSe effectively improves the effective mass of SnTe while restraining its carrier ***,a maximum figure of merit(ZT) of~ 0.87 at 823 K and an average ZT of~ 0.51 at 300-823 K have been achieved in Sn_(0.96)Bi_(0.04)Te-5%*** results indicate that decreasing the electronic thermal conductivity is an effective means of improving the performance of thermoelectric materials with a high carrier concentration.

关键词： Thermoelectric materials SnTe Energy band structure Electronic thermal conductivity ZT value

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High energy storage performance in AgNbO_(3) relaxor ferroelectric films induced by nanopillar structure

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Journal of Materials Science & Technology 2023年第24期155卷 160-166页

作者： Xiang Li Jing wang Xingyuan san Ning wang Lei Zhao Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province College Physics Science and Technology Hebei University Baoding 071002 China State Key Laboratory of Mechanics and Control of Mechanical Structures College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Huangpu Hydrogen Energy Innovation Center School of Chemistry and Chemical Engineering Guangzhou University Guangzhou 510006 China

Inspired by the increasing demand for energy-storage capacitors in electrical and electronic systems, dielectrics with high energy-storage performance have attracted more and more attention. AgNbO_(3) -based lead-free ceramics serve as one of the most promising environmental-friendly candidates. However, their energy storage optimization is seriously limited by the low breakdown strength. Fortunately, thin film as a form of AgNbO3 materials can effectively improve the breakdown strength. In this work, AgNbO_(3)film with ∼550 nm in thickness was deposited on SrRuO_(3 )/(001)SrTiO_(3) using pulsed laser deposition. The AgNbO_(3) film reveals typical relaxor ferroelectric hysteresis loops due to the new nanopillar structure, which contributes to high breakdown strength of up to 1200 kV cm^(-1) . Benefiting from the high breakdown strength, a recoverable energy storage density of 10.3 J cm^(-3) and an energy efficiency of 72.2% are obtained in the AgNbO_(3) film, which demonstrates the promising prospect of AgNbO_(3) film for energy storage applications.

关键词： AgNbO3 film Relaxor ferroelectrics Energy storage performance Nanopillar structure

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Prospects of fuel cell technologies

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National Science Review 2017年第2期4卷 163-166页

作者： shuangyin wang san Ping Jiang State Key Laboratory of Chem/Bio-Sensing and Chemometrics College of Chemistry and Chemical EngineeringHunan University Fuels and Energy Technology Institute and Department of Chemical Engineering Curtin University

Fuel cells(FCs) are efficient and clean devices to electrochemically convert the chemical energy of fuels such as hydrogen,natural gas(NG),methanol,ethanol and hydrocarbons to electric energy with significantly high e... 详细信息

关键词： cell Prospects of fuel cell technologies PAFC PEMFC

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Thermal Entanglement of an XY Two-Qutrit Spin Chain with Dzialoshinski—Moriya Interaction

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Communications in Theoretical Physics 2009年第11期52卷 825-828页

作者： MA Xiao-san wang An-Min School of Electric Engineering and Information Anhui University of Technology Ma＇anshan 243002 China Department of Modern Physics University of Science and Technology of China Hefei 230026 China

The effect of Dzialoshinski-Moriya(DM)interaction on thermal entanglement of an XY two-qutrit spinchain is *** find that DM interaction and the anisotropy parameter can enhance quantum thermal entanglementto a maximal value ***,when both of them take large values,the entanglement is notenhanced,but is *** analysis will shed some light on the understanding of the effect of the DM interactionon thermal entanglement of an XY two-qutrit spin chain.

关键词： thermal entanglement XY spin chain DM interaction

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Geometric Phases Corrected by Stochastic Dephasing

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Communications in Theoretical Physics 2008年第5期49卷 1179-1181页

作者： MA Xiao-san wang An-Min Department of Modern Physics University of Science and Technology of China Hefei 230026 China

We analyze the effect of stochastic dephasing on geometric phases. The result implies that the correction of geometric phases relies on not only the fluctuation of the random variable in the stochastic process, but al... 详细信息

关键词： stochastic dephasing geometric phase

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Incorporating element doping and quantum dot embedding effects to enhance the thermoelectric properties of higher manganese silicides

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Journal of Materiomics 2021年第2期7卷 377-387页

作者： Qing wang Shiyu Song Xiaofeng Yang Ziyang Liu Yufei Ma Xingyuan san Jianglong wang Dan Zhang shu-Fang wang Zhiliang Li Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province College of Physics Science and TechnologyHebei UniversityBaoding071002China Institute of Life Science and Green Development Hebei UniversityBaoding071002China

Element doping and nano-inclusion embedding are effective approaches to enhance the electrical conductivities and decrease the lattice thermal conductivities of thermoelectric(TE)materials,***,the intrinsic low electrical thermal conductivities and high electrical properties are severely sacrificed,and the final figure of merit(ZT)is usually *** this study,Ag doping and Pt quantum dot(QD)embedding were synchronously achieved via embedding Ag/Pt alloy QDs into the higher manganese silicides to avoid the conventional single-element doping *** power factor(at 823 K)was enhanced from 1.57×10^(-3) W m^(-1) K^(-2) to 1.82×10^(-3) W m^(-1) K^(-2)(-16%)due to the-18%increase in carrier concentration that was derived from the Ag doping ***,the lattice thermal conductivity(at 823 K)decreased from 2.65 W m^(-1) K^(-1) e1.92 W m^(-1) K^(-1)(-28%)because of the broadband phonon scattering effect that resulted from the residual Pt QDs ***,the optimal ZT value increased by-52%from 0.42 to 0.64 at 823 *** study demonstrated that incorporating metastable alloy QDs to obtain element doping and nano-inclusion embedding effects is a novel and feasible means to enhance the ZT value of *** method is also possibly applicable to other alloy QD/TE composites.

关键词： Quantum dot Inclusion Higher manganese silicide Thermoelectric material Figure of merit

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Etiological roles of core promoter variation in triple-negative breast cancer

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Genes & Diseases 2023年第1期10卷 228-238页

作者： Teng Huang Jiaheng Li san Ming wang Cancer Centre and Institute of Translational Medicine Faculty of Health SciencesMinistry of Education Frontiers Science Center for Precision OncologyUniversity of MacaoTaipaMacao SAR 999078China

Abnormal geneexpression playskeyrole in *** is located around the transcriptional start *** interaction between core promoter sequences and transcriptional factors,core promoter controls transcriptional *** hypothesized that in cancer,core promoter sequences could be mutated to interfere the interaction with transcriptional factors,resulting in altered transcriptional initiation and abnormal gene expression and cancer *** used triple-negative breast cancer(TNBC)as a model to test our *** collected genome-wide core promoter variants from 279 TNBC *** extensive filtering of normal genomic polymorphism,we identified 19,427 recurrent somatic variants in 1,238 core promoters of 1,274 genes and 1,694 recurrent germline variants in 272 core promoters of 294 *** of the affected genes were oncogenes and tumor *** of RNA-seq data from the same patient cohort identified increased or decreased gene expression in 439 somatic and 85 germline variantsaffected genes,and the results were validated by luciferase reporter *** comparing with the core promoter variation data from 610 unclassified breast cancer,we observed that core promoter variants in TNBC were highly *** further identified the drugs targeting the genes with core promoter *** study demonstrates that core promoter is highly mutable in cancer,and can play etiological roles in TNBC and other types of cancer through influencing transcriptional initiation.

关键词： Core promoter RNA-seq Triple-negative breast cancer Variation Whole exome sequencing

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