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energy-resolved spin filtering effect and thermoelectric effect in topological-insulator junctions with anisotropic chiral edge states

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Frontiers of physics 2022年第6期17卷 85-93页

作者： Jia-en Yang Hang Xie School of Electronics and IoT Chongqing College of Electronic EngineeringChongqing 401331China college of Physics Chongqing UniversityChongqing 401331China Chongqing Key Laboratory for Strongly-coupled Physics Chongqing UniversityChongqing 401331China

Topological edge states have crucial applications in the future nano spintronics *** this work,circularly polarized light is applied on the zigzag silicene-like nanoribbons resulting in the anisotropic chiral edge *** energy-dependent spin filter is designed based on the topological-insulator(TI)junctions with anisotropic chiral edge *** resonance transmission has been observed in the TI junctions by calculating the local current *** some strong Fabry–Perot resonances are found leading to the sharp transmission ***,the weak and asymmetric resonance corresponds to the broad transmission *** addition,a qualitative relation between the resonant energy separation TR and group velo.ity vf is derived:TR=πhvf n/L,that indicated TR is proportional to vf and inversely proportional to the length L of the *** different TR between the spin-up and spin-down cases results in the energyresolved spin filtering ***,the intensity of the circularly polarized light can modulate the group velo.ity ***,the intensity of circularly polarized light,as well as the conductor-length,play very vital roles in designing the energy-dependent spin *** the transmission gap root in the Fabry–Perot resonances,the thermoelectric(TE)property can be enhanced by adjusting the gap.A schedule to enhance the TE performance in the TI-junction is proposed by modulating the electric field(Ez).The TE dependence on Ez in the nanojunction is investigated,where the appropriate Ez leads to a very high spin thermopower and spin figure of *** TI junctions have potential usages in the nano spintronics and thermoelectric devices.

关键词： electron transport topological edge states 2D materials spintronics thermoelectric effects

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ANALYSIS oF TWo-PHASE FLoW PRESSURE BUILDUP DATA FRoM A WELL IN ANINFINITE MULTI WELL RESERVoIR

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Journal of Hydrodynamics 2005年第4期17卷 489-497页

作者： LIN Jia-en YANG Hui-zhu Department of engineering Mechanics Tsinghua University Beijing 100084 China Petroleum engineering Institute Xi＇an Petroleum University Xi＇an 710065China Department of engineering Mechanics Tsinghua UniversityBeijing 100084 China

A general method has been developed for analyzing two-phase flow pressure buildup data from a well located in a system of both production and injection wells completed in an infinite muhiwell reservoir. The analysis technique assumes that the tested well has established its own drainage area before shut-in and a linear reservoir pressure trend dominates the well pressure behavior at the instant of shut-in. And for the two-phase flow problems the horizontal saturation gradients are assumed to be negligible. The entire pressure rcsponse, whether or not conventional semilog straight lines exist, can be analyzed and the Injection-Production Ratio （IPR）, the total fluid （oil/water） mobility, the average drainage-area pressure, and also the skin factor can be calculated much easily. The validity and applicability of the method are demonstrated by a field example. The technique by using the type curves for analyzing the pressure-buildup data is also presented here.

关键词： two-phase flow infinite multiwell reservoir well test analysis typc-curve analysis

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Change color Effect and Spectral Properties of Gold Nanoparticle-cationic Surfactants System

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Chemical Research in Chinese Universities 2004年第5期20卷 523-528页

作者： JIANGZhi-liang PANHong-cheng YUANWei-en DepartmentofResourceandenvironmentalScience GuangxiNormalUniversityGuilin541004P.R.China

The change color effect of gold nanoparticle solutions was studied by means of resonance scattering and absorption spectrometry and scan electron microscopy. The red Au nanoparticles with a size of 10 nm exhibit a resonance absorption peak and a resonance scattering peak all at 525 nm. After some inorganic electrolyte was added to a red Au nanoparticles solution, the color of the solution became blue and the absorbance at (600_700) nm was significantly increased. The ratio of the concentration of monovalent cations, at which the resonance scattering of the system at 525 nm is maximal to that of divalent cations, is in the range of 100∶1_100∶1.8. It is in good agreement with the Schulze-Hardy rule of the coagulation value of electrolyte. After adding some cationic surfactants to the above solution, the color of the solution is in deep blue, with two resonance absorption peaks at 550 and 680 nm, and a greatly enhanced resonance scattering peak at 525 nm. The experiments demonstrate that the stronger the hydrophobicity of the cationic surfactant is, the stronger the change color effect of the Au nanoparticle solution promoted by cationic surfactant is. The change color effect of Au nanoparticle solution is resulted from the increased diameter of Au nanoparticles, and the changes of resonance absorption peak and resonance scattering.

关键词： Change color effect Gold nanoparticle Cationic Surfactant

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Precipitated phases of superaustenitic stainless steel 654SMo

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Journal of Iron and Steel Research International 2017年第7期24卷 743-749页

作者： Zhi-gang Song en-xiang Pu Special Steel Institute Central Iron & Steel Research Institute School of Materials Science and engineering Tsinghua University

The phase diagram of superaustenitic stainless steel 654SMo was calculated by thermodynamic software and the precipitated phases in the specimens aged at 800-1100°C for 1hwere studied by methods of physicochemical phase analysis,scanning electron microscopy and transmission electron *** results showed that the size of precipitated particles increased with increasing the *** amount of second phases reached the maximum value at 900°C,but decreased above 900°*** were about eight kinds of precipitated phases in 654SMo includingσphase,Cr_2N,μphase,χphase,Laves phase,M_（23）C_6,M_6C and M_3C,in which theσphase and Cr_2N were the dominant precipitated phases.

关键词： 654SMo Precipitation Superaustenitic stainless steel Precipitated phase Second phase

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Novel developments in computational spectropolarimeter

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Light(Science & Applications) 2023年第3期12卷 321-322页

作者： en-Lin Hsiang Shin-Tson Wu college of optics and Photonics University of Central FloridaOrlandoFL 32816USA

compared to conventional bulky spectropolarimeters,computational spectropolarimeters which reconstruct light-field information such as polarization and spectrum in a compact form factor,are critical equipment enabling new *** key component of a computational spectropolarimeter is a tunable light-field modulator,in which liquid crystal-based device is a promising *** varying the applied voltage,the tunable liquid crystal metasurface can modulate the phase and spectral information of the incident light,and after a few trials,this important information can be decoded *** a novel approach paves the foundation for developing compact and low-cost spectropolarimetric imaging devices with widespread applications in biomedical imaging,remote sensing,and optical communications.

关键词： tunable polarization modulator

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Irradiation behaviors of two novel single-phase bcc-structure high-entropy alloys for accident-tolerant fuel cladding

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Journal of Materials Science & Technology 2021年第25期84卷 230-238页

作者： Zijian Zhang en-Hou Han Chao Xiang Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and engineering University of Science and Technology of ChinaShenyang110016China School of Materials Science and engineering Northeastern UniversityShenyang110819China

High-entropy alloys(HEAs)are potential alternative materials for accident-tolerant fuel cladding due to their excellent irradiation resistance and high-temperature corrosion *** this work,two novel body-centered cubic(bcc)structured Mo_(0.5)Nb Ti VCr_(0.25)and Mo_(0.5)Nb Ti V_(0.5)Zr_(0.25)HEAs were ***-ion irradiation was performed on the two HEAs to simulate neutron irradiation,and the crystal structure,hardness,and microstructure evolution were *** crystal structure of the Mo_(0.5)NbTiVCr_(0.25)HEA remained stable at low fluences,while amorphization may occur at high fluences in the two *** irradiation hardening value of the Mo_(0.5)NbTiVCr_(0.25)was 0.77 GPa at fluences of 1×10^(17)ions/cm^(2)and 1.49 GPa at fluences of 5×10^(17)ions/cm^(2),while the hardening value of the Mo_(0.5)NbTiV_(0.5)Zr_(0.25)was 1.36 GPa at ion fluences of 5×10^(17)ions/cm^(2).In comparison with most of the conventional alloys,the two HEAs showed slight irradiation *** helium bubbles and dislocation loops with small size were observed in the two HEAs after *** is the first time to report the formation of a dislocation loop in bcc-structure HEAs after ***,voids and precipitates were not observed in the two HEAs which could be ascribed to the high lattice distortion and compo.itional complexity of *** research revealed that the two HEAs show outstanding irradiation resistance,which may be promising accident-tolerant fuel cladding materials.

关键词： High-entropy alloy Accident-tolerant fuel cladding Helium-ion irradiation Microstructure Irradiation hardening

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Cl-induced passivity breakdown in α-Fe_(2)o_(3)(0001), α-Cr_(2)o_(3)(0001),and their interface: A DFT study

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Journal of Materials Science & Technology 2022年第34期129卷 70-78页

作者： Xiaoran Yin Haitao Wang en-Hou Han CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and engineering University of Science and Technology of ChinaShenyang 110016China Institute of corrosion Science and Technology Guangzhou 510530China

The presence of chloride ions is the critical factor of passivity breakdown of the protective film and eventually leads to localized corrosion. However, the mechanism and the role of chlorides in these processes are still controversial. Hematite and chromia are generally believed to be the major components of outer and inner oxide layers on stainless steels. In the present paper, a comparative study of Cl ingress into pristine and defective α-Fe_(2)o_(3)(0001) surface, α-Cr_(2)o_(3)(0001) surface, along with their interface, was conducted using density functional theory. Vacancy formation energy calculation confirms good stability of α-Cr_(2)o_(3)and high reactive activity of the interface region. Cl inserts into an o vacancy is energetically more favorable than Fe vacancy and interstitial site, demonstrating Cl-induced degradation complies with the ion exchange model. Transition state search for Cl diffusion through o vacancies shows α-Cr_(2)o_(3)is more protective than α-Fe_(2)o_(3), while the interface region is the weak point of the duplex passive film.

关键词： Hematite Chromia DFT+U Interface Cl-induced depassivation

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The Analysis of a Griffith Crack Embedded in a Thermo-poro-elastic Medium

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Acta Mechanica Solida Sinica 2023年第5期36卷 734-744页

作者： Yu Tan Yi-en Wang Chang Liu college of environment and Civil engineering Chengdu University of TechnologyChengdu 610059China School of Architecture and Civil engineering Xihua UniversityChengdu 610039China School of Mechanics and Aerospace engineering Southwest Jiaotong UniversityChengdu 610031China

The analytical solution of a thermo-poro-elastic medium in static state weakened by a Griffith crack with finite width is *** virtue of the Fourier cosine and sine integral transform techniques,the mixed boundary-value problem is formulated as three pairs of dual integral equations,which are solved with the help of the Abel *** addition,the stress intensity factor of mode Ⅰ and the crack surface displacement are presented *** examples are performed to show the distribution of displacement and stress over the thermo-poro-elastic *** results indicate that the thermal load will increase or decrease the crack surface displacement,but has a weak influence on the stress intensity *** present work may benefit future engineering applications.

关键词： Thermo-poro-elastic medium Analytical solution Grifﬁth crack Stress intensity factor

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Down-regulation of Bcl-X_L by RNA interference suppresses cell growth and induces apoptosis in human esophageal cancer cells

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World Journal of Gastroenterology 2006年第46期12卷 7472-7477页

作者： Yong-en Xie en-Jie Tang Da-Rong Zhang Bi-Xuan Ren The Institute of Immunology and Molecular Biology North Sichuan Medical College Nanchong 637007 Sichuan Province China

AIM： To determine the inhibitory effect of the vectorgenerated small interfering RNAs （siRNAs） on the expression of the BcI-XL gene in established human esophageal cancer cells, and to investigate the effect of the BcI-XL siRNAs on cell growth and apoptosis in esophageal cancer cells. METHoDS： Three siRNA-expressing vectors targeting different sites of the Bcl-XL gene were constructed from pTZ-U6＋I vector. Cultured esophageal cancer cells were transfected with the siRNA-expressing vector （or the control vector） using lipofectamine 2000. BcI-XL gene expression was determined with semiquantitative RT- PCR assay and Western blotting. Among the three siRNA- expressing vectors, the most highly functional vector and its effect on cell growth and apoptosis in esophageal cancer ceils was further analyzed. RESULTS： of the three siRNA-expressing vectors, siRNA- expressing vector No.1 was the most potent one which suppressed Bcl-XL mRNA production to 32.5% of that in the untreated esophageal cancer cells. Western blotting analysis showed that siRNA-expressing vector No.1 markedly down-regulated the expression of Bcl-XL in human esophageal cancer cells. Treatment of esophageal cancer cells with siRNA-expressing vector No.1 resulted in inhibition of cell growth and induction of apoptosis. coNCLUSIoN： Down-regulation of BcI-XL by vectorgenerated small interfering RNAs can suppress cell growth and induce apoptosis in human esophageal cancer cells.

关键词： Esophageal cancer BcI-XL RNA Interference Apoptosis

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A multiphysics model for studying transient crevice corrosion of stainless steel

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Journal of Materials Science & Technology 2021年第1期60卷 186-196页

作者： Jiawei Ding Haitao Wang en-Hou Han CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and engineering University of Science and Technology of ChinaHefei230026China

The transient crevice corrosion behavior of 304 stainless steel in NaCl solution has been investigated by a multiphysics coupling *** model considers local electrochemical reactions,transport of diffe rent species,and homogeneous *** moving mesh method is used to obtain the geometrical change of the crevice wall with time due to *** level set method is employed to quantitatively describe the influence of the precipitation process on electrochemical *** transient crevice corrosion morphology,potential and current distributions,and pH and chloride ion concentration distributions are obtained by *** effect of crevice geometry factors on the corrosion process is also *** simulation results are in good agreement with the experiments,showing that the model has high reliability.

关键词： Stainless steel Crevice corrosion Simulation Multiphysics Transient behavior

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