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Insight into vertical piezoelectric characteristics regulated thermal transport in van der Waals two-dimensional materials

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Rare Metals 2024年第2期43卷 770-779页

作者： Dong-Hai Wei E Zhou Jin-Yuan Xu Hui-Min Wang Chen Shen hong-bin zhang Zhen-Zhen Qin Guang-Zhao Qin State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha410082China Hunan Key Laboratory for Micro-Nano Energy Materials and Device and School of Physics and Optoelectronics Xiangtan UniversityXiangtan411105China Institute of Materials Science Technical University of DarmstadtAlarich-Weiss-Str.264287DarmstadtGermany School of Physics and Microelectronics Zhengzhou UniversityZhengzhou450001China

The urgent demand of extreme(ultra-high/low)thermal conductivity materials is triggered by the high-power device,where exploring the theories and mechanisms of regulating thermal transport properties plays a key ***,we elaborately investigate the effect of vertical(out-of-plane)piezoelectric characteristics on thermal transport,which is historically *** different stacking-order(AA and AB)bilayer boron nitride(Bi-BN)in two-dimensional(2D)materials are selected as study *** performing state-of-the-art first-principles calculations,it is found that the polarization charge along the out-of-plane orientation ascends significantly with the increasing piezoelectric response in AB stacked Bi-BN(Bi-BN-AB)followed by the enhanced interlayer B–N atomic ***,the amplitude of phonon anharmonicity in Bi-BN-AB increases larger than that in the AA stacked Bi-BN(Bi-BN-AA),resulting in the dramatic weakening of the thermal conductivity by 20.34%under 18%*** research reveals the significant role of the vertical(out-of-plane)piezoelectric characteristic in regulating thermal transport and provides new insight into accurately exploring the thermal transport performance of 2D van der Waals materials.

关键词： Thermal conductivity Piezoelectric effect 2D materials Bilayer BN Strain engineering

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Strong hopping induced Dzyaloshinskii–Moriya interaction and skyrmions in elemental cobalt

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npj Computational Materials 2019年第1期5卷 708-713页

作者： Hu-bin Luo hong-bin zhang JPing Liu Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and EngineeringChinese Academy of Sciences315201 NingboChina Department of Materials and Geosciences TU Darmstadt64287 DarmstadtGermany Department of Physics University of Texas at ArlingtonArlingtonTX 76091USA

The Dzyaloshinskii–Moriya interaction(DMI)is well known to favor a chiral rotation of the magnetic moments,which accounts for the emergence of the *** DMI is a combined effect of spin–orbit coupling with broken inversion symmetry in *** of the noncentrosymmetric magnetic materials that bear skyrmions involve nonmagnetic *** work shows that strong DMIs exist in elemental cobalt with a β-Mn-type metastable *** variation of DMI among different cobalt pairs largely follows the variation of hopping magnitude in which p electrons play an important *** the DMIs between different atomic pairs partly cancels with each other,the net interaction is sufficient to result in a left-handed Bloch-type *** dynamics simulation shows that a critical magnetic field of 2.9 T stabilizes skyrmions at 0 K.

关键词： structure cobalt interaction

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Effective treatment of polyneuropathy,organomegaly,endocrinopathy,M-protein,and skin changes syndrome with congestive heart failure:A case report

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World Journal of Clinical Cases 2021年第25期9卷 7504-7511页

作者： Ling-Yao Fu hong-bin zhang Department of Hematology The First Affiliated Hospital of Chongqing Medical UniversityChongqing 400016China

BACKGROUND Polyneuropathy,organomegaly,endocrinopathy,M-protein,and skin changes(POEMS)syndrome is a rare paraneoplastic syndrome caused by a plasma cell proliferative *** syndrome is characterized by elevated plasma cells,platelets,and vascular endothelial growth factor *** heart disease rarely occurs in POEMS syndrome,the death rate increases sharply after heart *** report a patient who initially presented with an endocrine disease and developed congestive heart failure related to POEMS syndrome 9 years *** SUMMARY A 23-year-old woman with no history of menstruation and a 9-year history of type I diabetes reported feeling breathless after *** could not lie down and rest at *** months prior,she experienced pain and increased tension in her left thigh accompanied by tenderness and edema in both lower *** chief complaint upon hospital admission was that blood sugar has increased for more than 9 years,pain in the left thigh,and edema in both legs for more than 2 *** a multisystem evaluation,she was diagnosed with POEMS *** echocardiogram showed left ventricular dilation with systolic dysfunction,and the left ventricular ejection fraction was only 38%with severely elevated brain natriuretic *** received a combination of dexamethasone and thalidomide for 1 mo,but her symptoms did not ***,we added a two-per-week bortezomib *** 2 wk,the patient’s heart function had improved *** This case provides information about the treatment of POEMS syndrome with complications and highlights the challenges of developing a standardized treatment.

关键词： Polyneuropathy,organomegaly,endocrinopathy,M-protein,and skin changes syndrome Heart failure Ejection fraction Vascular endothelial growth factor Bortezomib Case report

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Factors associated with patient absenteeism for scheduled endoscopy

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World Journal of Gastroenterology 2009年第23期15卷 2882-2886页

作者： Victor K Wong hong-bin zhang Robert Enns St. Paul's Hospital Universityof British Columbia Vancouver V6Z-2K5 BC Canada Centre for Health Evaluation and OutcomesSciences St. Paul's Hospital University of British ColumbiaVancouver V6Z-2K5 BC Canada

AIM: To identify risk factors to help predict which patients are likely to fail to appear for an endoscopic procedure. METHODS: This was a retrospective, chart review, cohort study in a Canadian, tertiary care, academic, hospital-based endoscopy clinic. Patients included were: those undergoing esophagogastroduodenoscopy, colonoscopy or flexible sigmoidoscopy and patients who failed to appear were compared to a control group. The main outcome measure was a multivariate analysis of factors associated with truancy from scheduled endoscopic procedures. Factors analyzed included gender, age, waiting time, type of procedure, referring physician, distance to hospital, first or subsequent endoscopic procedure or encounter with gastroenterologist, and urgency of the procedure. RESULTS: Two hundred and thirty-four patients did not show up for their scheduled appointment. Compared to a control group, factors statistically significantly associated with truancy in the multivariate analysis were: non-urgent vs urgent procedure (OR 1.62, 95% CI 1.06, 2.450), referred by a specialist vs a family doctor (OR 2.76, 95% CI 1.31, 5.52) and office-based consult prior to endoscopy vs consult and endoscopic procedure during the same appointment (OR 2.24, 95% CI 1.33, 3.78). CONCLUSION: Identifying patients who are not scheduled for same-day consult and endoscopy, those referred by a specialist, and those with non-urgent referrals may help reduce patient truancy.

关键词： Absenteeism Colonoscopy Endoscopy Esophagogastroduodenoscopy Gastroenterologist

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Flash flood hazard mapping: A pilot case study in Xiapu River Basin, China

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Water Science and Engineering 2015年第3期8卷 195-204页

作者： Da-wei zhang Jin Quan hong-bin zhang Fan Wang hong Wang Xiao-yan He China Institute of Water Resources and Hydropower Research Research Center on Flood and Drought Disaster Reduction Ministry of Water Resources

Flash flood hazard mapping is a supporting component of non-structural measures for flash flood prevention. Pilot case studies are necessary to develop more practicable methods for the technical support systems of flash flood hazard mapping. In this study, the headwater catchment of the Xiapu River Basin in central China was selected as a pilot study area for flash flood hazard mapping. A conceptual distributed hydrological model was developed for flood calculation based on the framework of the Xinanjiang model, which is widely used in humid and semi-humid regions in China. The developed model employs the geomorphological unit hydrograph method, which is extremely valuable when simulating the overland flow process in ungauged catchments, as compared with the original Xinanjiang model. The model was tested in the pilot study area, and the results agree with the measured data on the whole. After calibration and validation, the model is shown to be a useful tool for flash flood calculation. A practicable method for flash flood hazard mapping using the calculated peak discharge and digital elevation model data was presented, and three levels of flood hazards were classified. The resulting flash flood hazard maps indicate that the method successfully predicts the spatial distribution of flash flood hazards, and it can meet the current requirements in China.

关键词： Flash flood hazard mapping Conceptual distributed hydrological model Xinanjiang model Geomorphological unit hydrograph Xiapu River Basin

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Dynamics of Two-Photon Lasers with A Atomic Level Configuration

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Communications in Theoretical Physics 2006年第1X期46卷 141-148页

作者： YANG Peng QIAN Feng HUANG hong-bin XIE Xia zhang Ya-Jun Department of Physics Southeast University Nanjing 210096~ China

We derive the dimensionless dynamic equations of two-photon lasers with A atomic level configuration by using the quantum Langevin equation method with the considerations of atomic coherence and injected classical fields. Then we analyze the stability and the chaotic dynamics of the two-photon laser by calculating the bifurcation diagram and the maximum Lyapunov exponent （MLE）. Our results show that the Lorenz strange attractors and one-focus strange attractors can exist in this system, and the chaos can be induced or inhibited by the injected classical fields via Hopfbifurcations or crises, while the atomic coherence induces chaos via crises, and inhibit chaos via Hopf bifurcation or crises.

关键词： dynamical laser instabilities noisy laser behavior

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Microstructure and Mechanical Behavior of CrFeNi2V0.5Wx(x=0,0.25)High-Entropy Alloys

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Acta Metallurgica Sinica(English Letters) 2020年第8期33卷 1117-1123页

作者： Hui Jiang Tian-Dang Huang Chao Su hong-bin zhang Kai-Ming Han Sheng-Xue Qin College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao 266590China Key Laboratory of Solidifi cation Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China

CrFeNi2V0.5Wx(x=0,0.25)alloys based on these parameters of mixing enthalpy(△Hmix,mixing entropy(△Smix,atomic radius difference(δ),valance electron concentration,and electronegativity difference(△χ)were designed and *** microstructure and room-temperature mechanical behavior of both alloys were *** test results showed that the CrFeNi2V0.5W0.25 alloy had higher yield strength than that of the W-free CrFeNi2V0.5 alloy,although they all exhibited quite larger compressive plasticity(ε>70%).Compression fracture surface of CrFeNi2V0.5W0.25 alloy revealed a ductile fracture in the face-centered cubic(FCC)phase and a brittle-like fracture in theσ***,tensile test results indicated that the CrFeNi2V0.5W0.25 alloy exhibited excellent mechanical property with an ultimate tensile strength of 640 MPa and a high tensile elongation of 15.7%.The tensile deformation mode of the FCC phase in the CrFeNi2V0.5W0.25alloy is dominated by planar glide,relating to dislocation configurations,high-density dislocations,and dislocation ***,dislocation slip plays a significant role in tensile deformation of CrFeNi2V0.5W0.25 high-entropy *** higher strength of CrFeNi2V0.5W0.25 alloy is predominantly due to the solid solution strengthening of W element andσphase precipitation *** of the higher tensile strength and plasticity suggests that the CrFeNi2V0.5W0.25 alloy can be a promising aerospace material.

关键词： High-entropy alloy Microstructure Mechanical property Deformation behavior

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STRUCTURE EVOLUTION OF POLYMER CHAINS FOR NECKING FORMATION IN HIGH-SPEED FIBER SPINNING PROCESS

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Chinese Journal of Polymer Science 2006年第1期24卷 1-11页

作者： hong Zheng Wei Yu hong-bin zhang and Chi-xing Zhou Department of Polymer Materials Science & Engineering,Shanghai Jiao Tong University,Shanghai 200240,China Department of Polymer Materials Science & Engineering Shanghai Jiao Tong University Shanghai 200240

Finite element method is used to simulate the high-speed melt spinning process, based on the equation system proposed by Doufas et al. Calculation predicts a neck-like deformation, as well as the related profiles of velocity, diameter, temperature, chain orientation, and crystallinity in the fiber spinning process. Considering combined effects on the process such as flow-induced crystallization, viscoelasticity, filament cooling, air drag, inertia, surface tension and gravity, the simulated material flow behaviors are consistent with those observed for semi-crystalline polymers under various spinning conditions, The structure change of polymer coils in the necking region described by the evolution of conformation tensor is also investigated. Based on the relaxation mechanism of macromolecules in flow field different types of morphology change of polymer chains before and in the neck are proposed, giving a complete prospect of structure evolution and crystallization of semi-crystalline polymer in the high speed fiber spinning process.

关键词： Semi-crystalline Polymer Crystallization High-speed Fiber Spinning Process Conformation Finite Element Method (FEM).

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Long-Term Application of Organic Manure and Mineral Fertilizer on N_2O and CO_2 Emissions in a Red Soil from Cultivated Maize-Wheat Rotation in China

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Agricultural Sciences in China 2011年第11期10卷 1748-1757页

作者： ZHAI Li-mei L1U hong-bin zhang Ji-zong HUANG Jing WANG Bo-ren Key Laboratory of Nonpoint Pollution Control Ministry of Agriculture~Institute of Agricultural Resources and Regional Planning ChineseAcademy of Agricultural Sciences Beijing 100081 P.R.China

A long-term field experiment was established to determine the influence of mineral fertilizer and organic manure on soil fertility. A tract of red soil （Ferralic Cambisol） in Qiyang Red Soil Experimental Station （Qiyang County, Hunan Province, China） was fertilized beginning in 1990 and N20 and CO2 were examined during the maize and wheat growth season of 2007-2008. The study involved five treatments： organic manure （NPKM）, fertilizer NPK （NPK）, fertilizer NP （NP）, fertilizer NK （NK）, and control （CK）. Manured soils had higher crop biomass, organic C, and pH than soils receiving the various mineralized fertilizers indicating that long-term application of manures could efficiently prevent red soil acidification and increase crop productivity. The application of manures and fertilizers at a rate of 300 kg N ha-1 yr-1 obviously increased NzO and CO2 emissions from 0.58 kg N20-N ha-~ yr-~ and 10565 kg C ha-~ yr-~ in the CK treatment soil to 3.0l kg N20-N ha-~ yr-~ and 28 663 kg C ha-~ yr-I in the NPKM treatment. There were also obvious different effects on N20 and CO2 emissions between applying fertilizer and manure. More N20 and CO2 released during the 184-d maize growing season than the 125- d wheat growth season in the manure fertilized soils but not in mineral fertilizer treatments. N20 emission was significantly affected by soil moisture only during the wheat growing season, and CO2 emission was affected by soil temperature only in CK and NP treatment during the wheat and maize growing season. In sum, this study indicates the application of organic manure may be a preferred strategy for maintaining red emissions than treatments only with mineral fertilizer. soil productivity, but may result in greater N20 and CO2

关键词： red soil N fertilizer organic manure temperature WFPS

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Mars exploration——In situ K-Ar dating of jarosite

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Science China Earth Sciences 2024年第3期67卷 641-656页

作者： Jing YANG Dewen ZHENG Ying WU hong CHEN Li YANG bin zhang Key Laboratory of Active Tectonics and Geological Safety Ministry of Natural ResourcesInstitute of GeomechanicsChinese Academy of Geological SciencesBeijing 100081China State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China Institute of Earth Sciences China University of GeosciencesBeijing 100083China Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029Chin

To accurately determine the chronological framework of climatic variations recorded by various Martian terrains, the absolute ages of Martian events and cratering rate need to be constrained by either in situ dating or returned samples. In situ K-Ar dating is currently a more plausible dating technique as compared with sample return. Jarosite(KFe_(3)[SO_(4)]_(2)[OH]_(6)) is the only confirmed K sulfate mineral that is widely present on Mars, as indicated by in situ detection, orbital remote sensing, and meteorite studies. Jarosite can be used for precise K-Ar and (40)Ar/(39)Ar dating. The preservation of jarosite on Mars provides information about the nature and duration of aqueous processes on the Martian surface. Different ages of Martian jarosite represent the key to constraining the transition from Martian surface water activity to arid climatic conditions. This paper summarizes recent advances in our knowledge of the spatial distribution of Martian jarosite, its mineralogical properties and stability on Mars, the Ar diffusion kinetics of jarosite, and the current status of in situ K-Ar dating. Moreover, we examine the key scientific issues to be addressed for in situ K-Ar dating of jarosite and Martian sample return missions, and discuss future research directions.

关键词： Mars Jarosite In situ K-Ar dating Ar diffusion Stability

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