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Green’s Function for Two-Dimensional Piezoelectric Quasicrystals Containing Elliptical Defects 认领 引用
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作者 Tangrui Lai Xiaoyu Fu +2 位作者 Xiang Mu Liangliang Zhang Yang Gao 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2026年第1期65-80,共16页
Based on the linear elasticity theory of quasicrystals,this study addresses two defect problems in two-dimensional piezoelectric quasicrystals:rigid inclusions and holes.Using the Stroh formalism,Green’s function sol... Based on the linear elasticity theory of quasicrystals,this study addresses two defect problems in two-dimensional piezoelectric quasicrystals:rigid inclusions and holes.Using the Stroh formalism,Green’s function solutions are obtained for these defects under concentrated and uniformly distributed forces.Numerical examples are presented to analyze the mechanical behavior when loads are applied at various positions,including the center,outside,on the boundary,and at infinity of the elliptical defect.The study emphasizes the significant impact of the phonon line force on the distribution of key physical quantities.Results show that elliptical defects significantly disrupt multiple physical fields,leading to substantial variations in displacement and potential at the hole boundaries and pronounced stress concentrations.The stress in the phason field near the elliptical defect boundary exhibits complex variations under loading conditions,and the piezoelectric effect becomes more pronounced.These findings provide critical guidance for designing quasicrystal-based smart materials with controlled defect responses. 展开更多
关键词 Piezoelectric quasicrystals Stroh formalism Green’s function Analytical solutions Elliptical defect
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GREEN FUNCTION ON TWO-PHASE SATURATED MEDIUM BY CONCENTRATED FORCE IN TWO-DIMENSIONAL DISPLACEMENT FIELD 认领 引用 被引量：2
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作者 丁伯阳 丁翠红 +1 位作者 陈禹 陶海冰 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2004年第8期951-956,共6页
The Green function on two-phase saturated medium by concentrated force has a broad and important use In seismology, seismic engineering, soil mechanics, geophysics, dynamic foundation theory and so on. According to th... The Green function on two-phase saturated medium by concentrated force has a broad and important use In seismology, seismic engineering, soil mechanics, geophysics, dynamic foundation theory and so on. According to the Green function on two-phase saturated medium by concentrated force in three-dimentional displacement field obtained by Ding Bo-yang et al., it gives out the Green function in two-dimensional displacement field by infinite integral method along x(3)-direction derived by De Hoop and Manolis. The method adopted in the thesis is simpler. The result will be simplified to the boundary element method of dynamic problem. 展开更多
关键词 concentrated force two-phase saturated medium two-dimensional Green function
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Green's functions of two-dimensional piezoelectric quasicrystal in half-space and bimaterials 认领 引用 被引量：3
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作者 Xiaoyu FU Xiang MU +2 位作者 Jinming ZHANG Liangliang ZHANG Yang GAO 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2023年第2期237-254,共18页
In this paper,we obtain Green’s functions of two-dimensional(2D)piezoelectric quasicrystal(PQC)in half-space and bimaterials.Based on the elastic theory of QCs,the Stroh formalism is used to derive the general soluti... In this paper,we obtain Green’s functions of two-dimensional(2D)piezoelectric quasicrystal(PQC)in half-space and bimaterials.Based on the elastic theory of QCs,the Stroh formalism is used to derive the general solutions of displacements and stresses.Then,we obtain the analytical solutions of half-space and bimaterial Green’s functions.Besides,the interfacial Green’s function for bimaterials is also obtained in the analytical form.Before numerical studies,a comparative study is carried out to validate the present solutions.Typical numerical examples are performed to investigate the effects of multi-physics loadings such as the line force,the line dislocation,the line charge,and the phason line force.As a result,the coupling effect among the phonon field,the phason field,and the electric field is prominent,and the butterfly-shaped contours are characteristic in 2D PQCs.In addition,the changes of material parameters cause variations in physical quantities to a certain degree. 展开更多
关键词 Green’s function two-dimensional(2D)piezoelectric quasicrystal(PQC) Stroh formalism half-space bimaterial
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Magnetic Properties of a Mixed Spin-2 and Spin-5/2 Heisenberg Ferrimagnetic System on a Two-Dimensional Honeycomb Lattice: Green's Function Approach 认领 引用 被引量：3
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作者 YAO Kai-Lun LI Jian-Wen +2 位作者 LIU Zu-Li FU Hua-Hua ZU Lin 《Communications in Theoretical Physics》 SCIE CAS 2007年第4期741-746,共6页
The multisublattice Green＇s function technique is applied to study the magnetic properties of a mixed spin-2 and spin-5/2 Heisenberg ferrimagnetic system on a two-dimensional honeycomb lattice. The role of the differ... The multisublattice Green＇s function technique is applied to study the magnetic properties of a mixed spin-2 and spin-5/2 Heisenberg ferrimagnetic system on a two-dimensional honeycomb lattice. The role of the different interactions in the Hamiltonian is explored. When only the nearest-neighbor interaction and the single-ion anisotropy are included, our results indicate that there are compensation points at finite temperatures. When the next-nearest-neighbor interaction exceeds a minimum value that depends on the other parameters in the Hamiltonian, the compensation point disappears. The next-nearest-neighbor interaction has the effect of changing the compensation temperature. 展开更多
关键词 Heisenberg ferrimagnetic Green function spin-wave spectra magnetization critical temperature compensation temperature
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Mathematic Model of Green Function with Two-Dimensional Free Water Surface 认领 引用 被引量：1
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作者 Sujing Jin Xing Wang +2 位作者 Junjun Du Shesheng Zhang Shengping Jin 《Applied Mathematics》 2013年第8期75-79,共5页
Adopting complex number theory, a mathematic model of Green function is built for two dimension free water surface, and an analytic expression of Green function is obtained by introducing two parameters. The intrinsic... Adopting complex number theory, a mathematic model of Green function is built for two dimension free water surface, and an analytic expression of Green function is obtained by introducing two parameters. The intrinsic properties of Green function are discussed on vertical line and horizontal line. At last, the derivation expression of Green function is obtained from the formula of Green function. 展开更多
关键词 Green Function Free Surface Ship Hydrodynamics
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Modulated synthesis of stoichiometric and sub-stoichiometric two-dimensional covalent organic frameworks for enhanced ethylene purification 认领 引用 被引量：1
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作者 Jiahao Li Guinan Chen +5 位作者 Chunhong Chen Yuanyuan Lou Zhihao Xing Tao Zhang Chengtao Gong Yongwu Peng 《Chinese Chemical Letters》 SCIE CAS CSCD 2025年第1期272-276,共5页
Controlled synthesis of two-dimensional covalent organic frameworks(2D COFs),including stoichiometric and sub-stoichiometric variations,is a topic of growing interest due to its potential in gas separation application... Controlled synthesis of two-dimensional covalent organic frameworks(2D COFs),including stoichiometric and sub-stoichiometric variations,is a topic of growing interest due to its potential in gas separation applications.In this study,we successfully synthesized three distinct 2D COFs by carefully adjusting solvent compositions and monomer ratios during the synthesis of[4+4]type COFs.These included a stoichiometric[4+4]type COF and two sub-stoichiometric[4+2]type COFs,featuring unreacted amino or formyl groups.The resulting COFs exhibit different gas adsorption and separation properties.Specifically,sub-stoichiometric COF-DA with residual amino groups shows comparable adsorption capacity for C2H2,C2H4,and CO2to stoichiometric COF-DAPy.In contrast,sub-stoichiometric COF-Py with residual formyl groups displays enhanced adsorption selectivity for C2H2/C2H4and C2H2/CO2separation,with the C2H2/C2H4selectivity being the highest among reported COFs,attributed to increased pore polarity resulting from the presence of formyl groups.This study not only offers an additional example of substoichiometric COF synthesis but also advocates for further exploration of sub-stoichiometric COF materials,particularly in the field of gas adsorption and separation. 展开更多
关键词 Two-dimensional covalent organic frameworks Stoichiometric and sub-stoichiometric Residual functional groups Ethylene purification
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Assessment of Regional Left Ventricular Myocardial Function in Rats after Acute Occlusion of Left Anterior Descending Artery by Two-dimensional Speckle Tracking Imaging 认领 引用 被引量：15
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作者 付倩 谢明星 +5 位作者 王静 王新房 吕清 卢晓芳 方凌云 程龙 《Journal of Huazhong University of Science and Technology(Medical Sciences)》 2009年第6期786-790,共5页
This study evaluated the change in regional left ventricular myocardial function in rats following acute occlusion of the left anterior descending coronary artery （LAD） by using two-dimensional speckle tracking imag... This study evaluated the change in regional left ventricular myocardial function in rats following acute occlusion of the left anterior descending coronary artery （LAD） by using two-dimensional speckle tracking imaging （2D-STI）. Sixty Wistar rats were randomly divided into two groups, a myocardial infarction （MI） group, in which 50 rats were subjected to LAD occlusion for 30–45 min, and a sham-operated （SHAM） group that contained 10 rats serving as control. Echo-cardiography was performed at baseline and 1, 4 and 8 week（s） after the operation. High frequency two-dimensional images of left ventricular short axis at papillary muscle level were recorded. Peak systolic radial strain （PRS） and circumferential strain （PCS） were measured in the mid-ventricle in short-axis view by using EchoPAC workstation. Left ventricular internal diameter at diastole （LVIDd） and systole （LVIDs）, fractional shortening （FS）, ejection fraction （EF） and left ventricular mass （LVM） were measured by anatomical M-model echocardiography. Infarct size was measured using triphenyl tetrazolium chloride （TTC） staining 1 week and 8 weeks after the operation. Fibrosis of left ventricu-lar myocardium was displayed using Van Gieson staining 1 week after the infarction. In terms of the TTC staining results, the left ventricle fell into three categories： infarcted, peri-infarcted and remote myocardial regions. Compared with those at baseline and in the SHAM group, （1） PRS and PCS in the infarcted, peri-infarcted and remote myocardial regions were significantly decreased in the MI group within 1 week after the operation （P〈0.05） and the low levels lasted 8 weeks; （2） Compared with those at baseline, LVIDd, LVIDs, FS, EF and LVM in the MI group showed no significant dif-ference 1 week after the operation （P〉0.05）. However, LVIDd, LVIDs and LVM were increased sig-nificantly 4 and 8 weeks after the operation （P〈0.05）, and FS and EF were decreased substantially （P〈0.05）. Van Gieson staining showed that fibrosis developed in all the three myocardial regions to varying degrees. It is concluded that 2D-STI is non-invasive and can be used to assess regional func-tion of myocardium with different blood supply in rats following acute occlusion of the LAD, and can be used as a sensitive and reliable means to follow up the process of left ventricular remodeling. 展开更多
关键词 echocardiography ventricular function, left left ventricular remodeling two-dimensional strain
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A strategy for green infrastructure network based on multifunctional synergy 认领 引用
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作者 Jinbing Zhang Pengyan Zhang +5 位作者 Yu Liu Zhenyue Liu Zhuo Chen Yue Sun Ziyi Shan Zhenguo Tang 《Ecological Frontiers》 CSCD 2025年第2期483-496,共14页
The multifunctionality of green infrastructure(GI)has become an important component of sustainable urban development,influenced by the pressures associated with climate extremes and agglomeration of populations.The pr... The multifunctionality of green infrastructure(GI)has become an important component of sustainable urban development,influenced by the pressures associated with climate extremes and agglomeration of populations.The protection and construction of urban GI is an essential way of adapting to the national policy of high-quality development at the current stage.However,how GI is developed needs to be further discussed.In this study,Zhengzhou City,a centre city in China,as a case.We proposed an analytical framework of“functional assessment-correlation analysis-corridor network”in this study.It specifically refers to the assessment and the trade-off and synergy analysis of the six GI functions,namely stormwater management,climate regulation,landscape recreation,air quality,biodiversity and social vulnerability.This is based on the bivariate local indicators of spatial association and circuit theory methods.We found that the urban GI construction areas do not match the built-up areas of the city.Moreover,most of the GI functions were found to show synergistic effects,except for the trade-off with air quality.In addition,we constructed a GI network containing 12 GI hubs and 24 GI corridors to address the inequality in geospatial distribution of GI due to spatial heterogeneity.This paper provides a reliable strategic foundation for the relevant decision makers to optimize GI planning in Zhengzhou.It also provides a scientific reference for GI planning in similar areas to support sustainable habitat development in metropolitan areas. 展开更多
关键词 Circuit theory GI function Spatial Association Green infrastructure Zheng zhou
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Assessment of Myocardial Perfusion and Systolic Function in Patients with Coronary Artery Disease after Coronary Artery Bypass Surgery by Myocardial Contrast Echocardiography and Two-dimensional Strain Echocardiography 认领 引用 被引量：7
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作者 刘蓉 邓又斌 +3 位作者 毕小军 刘娅妮 熊莉 陈刘平 《Journal of Huazhong University of Science and Technology(Medical Sciences)》 2009年第5期664-668,共5页
The clinically applied value of myocardial perfusion and systolic function in patients with coronary artery disease after coronary artery bypass surgery using real-time myocardial contrast echocardiography （RT-MCE） ... The clinically applied value of myocardial perfusion and systolic function in patients with coronary artery disease after coronary artery bypass surgery using real-time myocardial contrast echocardiography （RT-MCE） combined with two-dimensional strain echocardiography was assessed. Twenty patients underwent intravenous RT-MCE by intravenous injections of SonoVue before and after coronary artery bypass surgery. Two-dimensional images were recorded from the left ventricular four-chamber view, two-chamber view and the apical view before, and two weeks and three months after coronary artery bypass surgery, and the peak systolic longitudinal strain was measured. The results showed that myocardial perfusion was significantly increased after coronary artery bypass surgery in about 71.6% segments. In the group that myocardial perfusion was improved, the peak systolic longitu- dinal strain three months after bypass surgery was significantly higher than that before operation [（-15.78±5.91）% vs （-10.45±8.31）%, P〈0.05]. However, the parameters did not change in the group without myocardial perfusion improvement [（-10.33±6.53）% vs （-9.41±6.09）%, P〉0.05]. It was concluded that whether or not the improvement of myocardial perfusion can mirror the recovery trend of regional systolic function, two-dimensional strain echocardiography can observe dynamic change of regional systolic function. The combination of myocardial perfusion with two-dimensional strain echocardiography can more accurately assess the curative effectiveness of coronary artery bypass surgery. 展开更多
关键词 two-dimensional strain myocardial contrast echocardiography myocardial perfusion ventricular function coronary artery disease
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Recent Advancements in Biochar Functionalization from Crop Residues for a Green Future 认领 引用
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作者 Omojola Awogbemi Daramy Vandi Von Kallon Ramesh CRay 《Journal of Renewable Materials》 EI CAS 2025年第11期2191-2233,共43页
Increased human and industrial activities have exacerbated the release of toxic materials and acute envi-ronmental pollution in recent times.Biochar,a carbon-rich material produced from biomass,is gaining momentum as ... Increased human and industrial activities have exacerbated the release of toxic materials and acute envi-ronmental pollution in recent times.Biochar,a carbon-rich material produced from biomass,is gaining momentum as a versatile material for attaining a sustainable environment.The study reviews the application of functionalized biochar for energy storage,environmental remediation,catalysis,and sustainable agriculture,aiming to achieve a greener future.Thedeployment of crop residues as a renewable feedstock for biochar,and their properties,compositions,modification,and functionalization techniques are also discussed.Additionally,the avenues for applying functionalized biochar to achieve a greener future,future trends and innovations,challenges,and future research directions are highlighted.Despite the limitations of scalability,ecotoxicological risks,logistical issues,lack of characterization protocols,high production costs,poor social acceptance,and inadequate policy and regulatory frameworks,functionalized biochar offers a better surface area,improved porosity,enhanced functional groups,and higher recoverability,leading to improved performance,adsorption capacity,biodegradability,and applications in specialized fields.Future research should prioritize standardization,scalability,cost reduction strategies,expansion of application areas,integration of emerging tools such as artificial intelligence and predictive modeling,and the development of policy and regulatory frameworks,ensuring that biochar’s full potential is harnessed effectively to support a low-carbon,resource-efficient future and global sustainability goals. 展开更多
关键词 Functionalization techniques biochar crop residues adsorption capacity green future energy storage
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Band gaps structure and semi-Dirac point of two-dimensional function photonic crystals 认领 引用 被引量：7
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作者 Si-Qi Zhang Jing-Bin Lu +6 位作者 Yu Liang Ji Ma Hong Li Xue Li Xiao-Jing Liu Xiang-Yao Wu Xiang-Dong Meng 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第2期242-249,共8页
Two-dimensional function photonic crystals, in which the dielectric constants of medium columns are the functions of space coordinates , are proposed and studied numerically. The band gaps structures of the photonic c... Two-dimensional function photonic crystals, in which the dielectric constants of medium columns are the functions of space coordinates , are proposed and studied numerically. The band gaps structures of the photonic crystals for TE and TM waves are different from the two-dimensional conventional photonic crystals. Some absolute band gaps and semiDirac points are found. When the medium column radius and the function form of the dielectric constant are modulated, the numbers, width, and position of band gaps are changed, and the semi-Dirac point can either occur or disappear. Therefore,the special band gaps structures and semi-Dirac points can be achieved through the modulation on the two-dimensional function photonic crystals. The results will provide a new design method of optical devices based on the two-dimensional function photonic crystals. 展开更多
关键词 two-dimensional photonic crystals function dielectric constants band gaps structures
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Stabilization of plant-derived carbon from different green manure species mediated by carbon-decomposition genes 认领 引用
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作者 Tingyu Li Wei Feng +3 位作者 Tianshu Wang Yili Meng Shuihong Yao Xinhua Peng 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2026年第6期2545-2555,共11页
The integration of green manure(GM)crops into traditional cropping systems has regained attention for its potential to improve soil organic carbon(SOC)content in an environmentally sustainable way.However,the effects ... The integration of green manure(GM)crops into traditional cropping systems has regained attention for its potential to improve soil organic carbon(SOC)content in an environmentally sustainable way.However,the effects of carbon(C)input from different GM species on the SOC accumulation and recalcitrant C fractions across soil profile remain inadequately understood.This three-year field study in the North China Plain assessed SOC changes and C fractions of easily oxidizable carbon(EOC)and recalcitrant organic carbon(ROC)in fallow,rye,rapeseed,and vetch systems,with δ13C analysis for GM-derived C fraction and microbial C-decomposition functional genes.Our results showed that SOC was significantly increased by GMs.Rapeseed was the only species that improved SOC at 20–40 cm,the rapeseed-derived C contributed 2.48%of the SOC.Rye enhanced EOC and ROC at topsoil,rapeseed increased ROC at 20–60 cm,and vetch increased EOC at 40–60 cm.At the topsoil,the abundances of cellulose-and pectin-decomposition genes were increased in vetch and decreased in rye.At 20–40 cm,the pectin-and lignin-decomposition genes were markedly improved by rapeseed,while at 40–60 cm,the chitin-decomposition gene was increased in vetch,indicating the microbial promoting effects by deep roots of vetch and rapeseed.Our results suggest GM species infiuence SOC deposition depth and the recalcitrance of SOC decomposition,thereby affecting the distribution of SOC accumulation through microbial-driven C decomposition activities. 展开更多
关键词 green manure SOC storage C recalcitrance C functional genes
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Habitat types and functional traits mediate differentiated response of birds assemblage to super typhoon 认领 引用
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作者 Demeng Jiang Yi Zhou +4 位作者 Gang Lu Yu Chen Yan Li Zhiqin Zhou Xu Luo 《Avian Research》 SCIE CAS CSCD 2026年第3期612-619,共8页
The proportion of intense tropical cyclones is projected to increase under climate change,posing growing threats to global biodiversity.However,most existing research has been conducted in the North Atlantic region an... The proportion of intense tropical cyclones is projected to increase under climate change,posing growing threats to global biodiversity.However,most existing research has been conducted in the North Atlantic region and has focused on their impacts on natural habitats,whereas other cyclone-prone but biodiversity-rich and human-disturbed ecosystems have been overlooked.Moreover,while functional traits are important in mediating species'responses to habitat change,their role remains understudied in cyclone contexts.To address these issues,we assessed the differences in bird communities before and after a super typhoon across two coastal habitat types in Haikou,southern China:urban green space and suburban habitats.We evaluated species richness,total abundance,community composition,and how functional traits shaped species'resilience to a super typhoon.We recorded 45 species and 1627 individuals from the field survey of 101.5-km-long transects.Species richness remained stable in both habitats after the typhoon.Bird abundance at the transect level declined in both habitats,but this decline was significant only in suburban habitats;community composition also shifted in both habitats due to species replacement and concurrent population gains and losses.Functional trait analysis indicated that species with a higher hand-wing index,lower body mass,or open-country habitat association were more vulnerable.These findings highlight the heightened vulnerability of suburban habitats to cyclonic disturbances and underscore the importance of incorporating functional trait analysis and non-forest ecosystems into climate impact assessments to inform more holistic biodiversity conservation strategies. 展开更多
关键词 Avian communities Ecological vulnerability Functional traits Species turnover Suburban habitats Super typhoon Urban green space
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The global response of temperature to high-latitude vegetation greening in a two-dimensional energy balance model 认领 引用
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作者 BI Lu HE Yongli +3 位作者 HUANG Jianping LI Yaokun GUAN Xiaodan LIU Xiaoyue 《Atmospheric and Oceanic Science Letters》 CSCD 2020年第1期80-87,共8页
The relationship between vegetation greening and climate change remains unclear due to its complexity, especially in drylands. Against the background of global warming, arid and semi-arid areas, including mid-latitude... The relationship between vegetation greening and climate change remains unclear due to its complexity, especially in drylands. Against the background of global warming, arid and semi-arid areas, including mid-latitude deserts, are most sensitive to climate change. In recent decades, the mechanisms underlying the relationship between vegetation greening and climate change have been widely discussed in the literature. However, the influence of vegetation greening in high latitudes on regional climate has not been fully studied. In this paper, a two-dimensional energy balance model was used to study the influence of greening in high latitudes on mid-latitude deserts. The authors found that when greening occurs in high latitudes, the mid-latitude desert recedes at the south boundary, while the polar ice belt and low-latitude vegetation belt both expand. Simultaneously, greening in high latitudes can induce a negative temperature anomaly in northern latitudes and a positive temperature anomaly in southern latitudes. The mid-latitude desert expands at its north and south boundaries until the CO2 concentration reaches 600 ppm(saturated state). The greening in high latitudes could result in a lower global-mean temperature in the ‘saturated’ state, due to the stronger cooling in high latitudes. 展开更多
关键词 High-latitude greening two-dimensional energy balance model mid-latitude desert remote effect global warming
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Static response of functionally graded multilayered two-dimensional quasicrystal plates with mixed boundary conditions 认领 引用
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作者 Xin FENG Liangliang ZHANG +3 位作者 Yuxuan WANG Jinming ZHANG Han ZHANG Yang GAO 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2021年第11期1599-1618,共20页
The unusual properties of quasicrystals(QCs)have attracted tremendous attention from researchers.In this paper,a semi-analytical solution is presented for the static response of a functionally graded(FG)multilayered t... The unusual properties of quasicrystals(QCs)have attracted tremendous attention from researchers.In this paper,a semi-analytical solution is presented for the static response of a functionally graded(FG)multilayered two-dimensional(2 D)decagonal QC rectangular plate with mixed boundary conditions.Based on the elastic theory of FG 2 D QCs,the state-space method is used to derive the state equations composed of partial differential along the thickness direction.Besides,the Fourier series expansion and the differential quadrature technique are utilized to simulate the simply supported boundary conditions and the mixed boundary conditions,respectively.Then,the propagator matrix which connects the field variables at the upper interface to those at the lower interface of any homogeneous layer can be derived based on the state equations.Combined with the interface continuity condition,the static response can be obtained by imposing the sinusoidal load on the top surfaces of laminates.Finally,the numerical examples are presented to verify the effectiveness of this method,and the results are very useful for the design and understanding of the characterization of FG QC materials in their applications to multilayered systems. 展开更多
关键词 two-dimensional(2D)quasicrystal(QC)laminate functionally graded material(FGM) mixed boundary condition static response differential quadrature technique
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Green公式应用中的正反问题 认领 引用
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作者 巩星田 杨树伟 《兰州理工大学学报》 CAS 北大核心 2026年第3期168-172,共5页
利用Green公式借助于齐次函数提出并证明将二重积分转化为曲线积分计算的定理及公式,在一定程度上体现了降维的优点,提供一种求解二重积分的新思路.通过典型例题展示理论在简化积分计算方面的运用.
关键词 Green公式 齐次函数 二重积分 曲线积分
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Comment on “Band gaps structure and semi-Dirac point of two-dimensional function photonic crystals” by Si-Qi Zhang et al. 认领 引用
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作者 章海锋 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第1期618-622,共5页
Recently, Zhang et al. （Chin. Phys. B 26 024208 （2017）） investigated the band gap structures and semi-Dirac point of two-dimensional function photonic crystals, and the equations for the plane wave expansion metho... Recently, Zhang et al. （Chin. Phys. B 26 024208 （2017）） investigated the band gap structures and semi-Dirac point of two-dimensional function photonic crystals, and the equations for the plane wave expansion method were induced to obtain the band structures. That report shows the band diagrams with the effects of function coefficient k and medium column ra under TE and TM waves. The proposed results look correct at first glance, but the authors made some mistakes in their report. Thus, the calculated results in their paper are incorrect. According to our calculations, the errors in their report are corrected, and the correct band structures also are presented in this paper. 展开更多
关键词 two-dimensional function photonic crystals photonic band gaps plane wave expansion method,Monte Carlo method
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Point Defects and Grain Boundaries Effects on Electrical Transports of PbTe Using the Non‑equilibrium Green’s Function 认领 引用
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作者 Mi Qin Bingqing Cao +6 位作者 Pan Zhang Xuemei Zhang Ziqi Han Xiaohong Zheng Xianlong Wang Xin Chen Yongsheng Zhang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2025年第5期811-822,共12页
Defect engineering is a commonly methodology used to enhance the thermoelectric performance of thermoelectric PbTe by improving its electronic transport properties.At the nanoscale,defects can induce quantum tunneling... Defect engineering is a commonly methodology used to enhance the thermoelectric performance of thermoelectric PbTe by improving its electronic transport properties.At the nanoscale,defects can induce quantum tunneling effects that significantly impact the electrical properties of materials.To understand the specific mechanisms underlying the quantum transport properties of PbTe,we employ the non-equilibrium Green's function(NEGF)method to investigate the effects of intrinsic defects(point defects and grain boundaries)on the electronic transport properties of PbTe-based nanodevices from a quantum mechanical perspective.Our results show that the Pb vacancy(VPb)has the highest conduction.The conduction depends on the defect type,chemical potential and bias voltage.The presence of intrinsic point defects introduces impurity levels,facilitating the electron tunneling and leading to an increase in the transmission coefficient,thereby enhancing the electronic transport properties.For PbTe containing grain boundaries,these boundaries suppress the electronic transport properties.The Te occupied twin boundary(Te-TB)exerts a stronger inhibitory effect than the Pb occupied twin boundary(Pb-TB).Nevertheless,the combined effect between twin boundaries and point defects can enhance the electrical properties.Therefore,in order to obtain highly conductive of PbTe materials,a Te-rich synthesis environment should be used to promote the effective formation of Pb vacancy.Our work offers a comprehensive understanding of the impact of defects on electron scattering in thermoelectric materials. 展开更多
关键词 Thermoelectric material PbTe Non-equilibrium Green’s function Transmission Defects
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Two-dimensional Pt2P3monolayer:A promising bifunctional electrocatalyst with different active sites for hydrogen evolution and CO2reduction 认领 引用 被引量：2
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作者 Yuting Sun Shuang Wang +6 位作者 Dongxu Jiao Fengyu Li Siyao Qiu Zhongxu Wang Qinghai Cai Jingxiang Zhao Chenghua Sun 《Chinese Chemical Letters》 SCIE CAS CSCD 2022年第8期3987-3992,共6页
Green hydrogen production and CO2 fixation have been identified as the fundamental techniques for sustainable economy.The open challenge is to develop high performance catalysts for hydrogen evolution reaction(HER)... Green hydrogen production and CO2 fixation have been identified as the fundamental techniques for sustainable economy.The open challenge is to develop high performance catalysts for hydrogen evolution reaction(HER)and CO2 electroreduction(CO2ER)to valuable chemicals.Under such context,this work reported computational efforts to design promising electrocatalyst for HER and CO2ER based on the swarm-intelligence algorithm.Among the family of transition-metal phosphides(TMPs),Pt2P3 monolayer has been identified as excellent bifunctional catalysts due to high stability,excellent conductivity and superior catalytic performance.Different from typical d-block catalysts,p-band center presented by P atoms within Pt2P3 monolayer plays the essential role for its reactivity towards HER and CO2ER,underlining the key value of p-electrons in advanced catalyst design and thus providing a promising strategy to further develop novel catalysts made of p-block elements for various energy applications. 展开更多
关键词 Bifunctional electrocatalysts HER/CO2ER Swarm-intelligence structure search Density functional theory Two-dimensional Monolayer
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Analyzing point liquid loading effects on transversely isotropic poroelastic media using Green's function 认领 引用
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作者 Muzammal Hameed Tariq Yue-Ting Zhou 《Communications in Theoretical Physics》 SCIE CAS CSCD 2025年第8期1-10,共10页
Understanding the effects of point liquid loading on transversely isotropic poroelastic media is crucial for advancing geomechanics and biomechanics, where precise modeling of fluid-structure interactions is essential... Understanding the effects of point liquid loading on transversely isotropic poroelastic media is crucial for advancing geomechanics and biomechanics, where precise modeling of fluid-structure interactions is essential. This paper presents a comprehensive analysis of infinite transversely isotropic poroelasticity under a fluid source, based on Biot's theory, aiming to uncover new and previously unexplored insights in the literature. We begin our study by deriving a general solution for fluid-saturated, transversely isotropic poroelastic materials in terms of harmonic functions that satisfy sixth-order homogeneous partial differential equations, using potential theory and Almansi's theorem. Based on these general solutions and potential functions, we construct a Green's function for a point fluid source, introducing three new harmonic functions with undetermined constants. These constants are determined by enforcing continuity and equilibrium conditions. Substituting these into the general solution yields fundamental solutions for poroelasticity that provide crucial support for a wide range of project problems. Numerical results and comparisons with existing literature are provided to illustrate physical mechanisms through contour plots. Our observations reveal that all components tend to zero in the far field and become singular at the concentrated source. Additionally, the contours exhibit rapid changes near the point fluid source but display gradual variations at a distance from it. These findings highlight the intricate behavior of the system under point liquid loading, offering valuable insights for further research and practical applications. 展开更多
关键词 poroelasticity one-point loading Green’s functions transversely isotropic materials potential theory method
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