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Effects of surface charges on phonon properties and thermal conductivity in GaN nanofilms

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Chinese Physics B 2019年第8期28卷 270-275页

作者： Shu-sen Yang Yang Hou lin-Li Zhu Department of Engineering Mechanics and Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceZhejiang UniversityHangzhou 310021China School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212000China

Surface charges can modify the elastic modulus of nanostructure,leading to the change of the phonon and thermal properties in semiconductor *** this work,the influence of surface charges on the phonon properties and phonon thermal conductivity of GaN nanofilm are quantitatively *** the framework of continuum mechanics,the modified elastic modulus can be derived for the nanofilm with surface *** elastic model is presented to analyze the phonon properties such as the phonon dispersion relation,phonon group velocity,density of states of phonons in nanofilm with the surface *** phonon thermal conductivity of nanofilm can be obtained by considering surface *** simulation results demonstrate that surface charges can significantly change the phonon properties and thermal conductivity in a GaN *** surface charges reduce the phonon energy and phonon group velocity but increase the density of states of *** surface charges can change the size and temperature dependence of phonon thermal conductivity of GaN *** on these theoretical results,one can adjust the phonon properties and temperature/size dependent thermal conductivity in GaN nanofilm by changing the surface charges.

关键词： surface charges GaN nanofilm elastic model phonon properties thermal conductivity

Nanostructured ZnO/BiVO_(4)I-scheme heterojunctions for piezocatalytic degradation of organic dyes via harvesting ultrasonic vibration energy

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 488-497页

作者： Yiling Li Xiaoyao Yu Yingjie Zhou Yao lin Ying Wu Key Laboratory of the Ministry of Education for Advanced Catalysis Materials College of Chemistry and Materials ScienceZhejiang Normal UniversityJinhua 321004China

BiVO_(4)porous spheres modified by ZnO were designed and synthesized using a facile two-step *** resulting ZnO/BiVO_(4)composite catalysts have shown remarkable efficiency as piezoelectric catalysts for degrading Rhodamine B(RhB)unde mechanical vibrations,they exhibit superior activity compared to pure *** 40wt%ZnO/BiVO_(4)heterojunction composite displayed the highest activity,along with good stability and *** enhanced piezoelectric catalytic activity can be attributed to the form ation of an I-scheme heterojunction structure,which can effectively inhibit the electron-hole ***,hole(h+)and superoxide radical(·O_(2)^(-))are proved to be the primary active ***,ZnO/BiVO_(4)stands as an efficient and stable piezoelectric catalyst with broad potential application in the field of environmental water pollution treatment.

关键词： piezoelectric catalytic heterojunction dye degradation ultrasonic vibration

Method of fabricating artificial rock specimens based on extrusion free forming(EFF)3D printing

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1455-1466页

作者： Xiaomeng Shi Tingbang Deng sen lin Chunjiang Zou Baoguo Liu Key Laboratory for Urban Underground Engineering of the Ministry of Education Beijing Jiaotong UniversityBeijing100044China School of Civil Engineering Beijing Jiaotong UniversityBeijing100044China Department of Civil Engineering Monash UniversityMelbourne3800Australia

Three-dimensional(3D)printing technology has been widely used to create artificial rock samples in rock *** 3D printing can create complex fractures,the material still lacks sufficient similarity to natural *** free forming(EFF)is a 3D printing technique that uses clay as the printing material and cures the specimens through high-temperature *** this study,we attempted to use the EFF technology to fabricate artificial rock *** results show the physico-mechanical properties of the specimens are significantly affected by the sintering temperature,while the nozzle diameter and layer thickness also have a certain *** specimens are primarily composed of SiO_(2),with mineral compositions similar to that of natural *** density,uniaxial compressive strength(UCS),elastic modulus,and tensile strength of the printed specimens fall in the range of 1.65–2.54 g/cm3,16.46–50.49 MPa,2.17–13.35 GPa,and 0.82–17.18 MPa,*** is capable of simulating different types of rocks,especially mudstone,sandstone,limestone,and ***,the simulation of hard rocks with UCS exceeding 50 MPa still requires validation.

关键词： Artificial rock 3D printing Extrusion free forming(EFF) Similarity analysis Mechanical properties

Complex granular flows of sticky-wet material on flip-flow screens:Calibration of discrete element simulations

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Particuology 2024年第1期84卷 290-308页

作者： Ningning Xu sen Tang Dongdong lin Runhui Geng Xinwen Wang Xihui Liang School of Chemical and Environmental Engineering China University of Mining and Technology(Beijing)Beijing100083China Department of Mechanical Engineering University of ManitobaWinnipegManitobaR3T 5V6Canada

Discrete element method(DEM)is an effective approach for studying the screening process of flip-flow ***,there have been few studies focusing on the thick layer of sticky-wet particles on flip-flow *** achieve accurate simulations of the thick layer of sticky-wet particles on a flip-flow screen,firstly,the movement law of particle flow was studied,and a multi-regime combination cali-bration method based on characteristics of particle flow regimes was *** on the Plackett-Burman experiment,the curse of dimensionality caused by multi-state and multi-contact parameters was ***,the lifting cylinder,rotating drum,and trampoline tests were carried out to obtain macroscopic reference values under various granular flow *** calibration results were then determined using the response surface method and climbing ***,the calibration results were tested at both macroscopic and mesoscopic scales and compared with a commonly used calibration *** results demonstrate that the calibration method,which considers the multi-state characteristics,improves simulation accuracy by 2%-10%and reduces the simulation error to less than 10%,thus meeting the requirements for engineering optimization of flip-flow screens.

关键词： DEM Complex granular flow Parameter calibration Flip-flow screen Sticky-wet particles Thick layer

Understanding electrokinetic thermodynamics in nanochannels

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Chinese Journal of Chemical Engineering 2021年第3期34卷 33-41页

作者： Jianglong Du Haolan Tao Jie Yang Cheng Lian sen lin Honglai Liu State Key Laboratory of Chemical Engineering Shanghai Engineering Research Center of Hierarchical Nanomaterialsand School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China Institute for Theoretical Physics Center for Extreme Matter and Emergent PhenomenaUtrecht UniversityPrincetonplein 53584 CC Utrechtthe Netherlands National Engineering Research Center for Integrated Utilization of Salt Lake Resources and State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical ProcessEast China University of Science and TechnologyShanghai 200237China

Understanding the electrokinetic conversion efficiency in a nanochannel is vital for designing energy storage and conversion *** this paper,an analytical electrokinetic energy conversion efficiency in a nanochannel is obtained based on the linear electrokinetic *** analytical result shows that the conversion efficiency has a maximum with the increasing of the nanochannel pore *** solutions based on the Poisson-Nernst-Planck(PNP)and Navier-Stokes(NS)equations are used to confirm the analytical ***,the influences of the pore radius and surface roughness on the conversion efficiency in nanochannels are also studied by the numerical *** particular,the influences of the surface roughness on the fluid flow,streaming current and streaming potential are *** results show that the large bumps and grooves representing the roughness can hinder the fluid flows and ion transports in the *** maximum efficiency in a smooth nanochannel is higher than that in a rough ***,the small bumps and grooves can increase the surface area of the channel,which is beneficial to improving the conversion efficiency in some *** research can provide theoretical guidance to design electrokinetic energy conversion devices.

关键词： Electrokinetic conversion efficiency linear electrokinetics Nanostructure Dynamic simulation Thermodynamics

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靶向Rad51与肿瘤治疗的研究进展

现代生物医学进展 2017年第15期17卷 2993-2995页

作者：冯书云杜鸿志黄悦侯晓莹伍瑶林森森袁胜涛孙立中国药科大学江苏省新药筛选重点实验室江苏南京210009

DNA损伤反应在维持细胞基因组稳定性和机体存活发挥重要作用。DNA双链断裂(Double strand breaks,DSBs)是DNA损伤最严重的形式。同源重组修复是体内参与DSBs损伤修复的重要机制之一,其中Rad51是体内参与同源重组性DNA修复的关键因子。Ra... 详细信息

DNA损伤反应在维持细胞基因组稳定性和机体存活发挥重要作用。DNA双链断裂(Double strand breaks,DSBs)是DNA损伤最严重的形式。同源重组修复是体内参与DSBs损伤修复的重要机制之一,其中Rad51是体内参与同源重组性DNA修复的关键因子。Rad51在人类的多种肿瘤组织中高表达,如乳腺癌、非小细胞肺癌、前列腺癌等,与肿瘤的转移和恶化相关。如何有效下调肿瘤组织中的Rad51的水平,降低肿瘤细胞的DNA损伤修复能力,从而提高肿瘤治疗的疗效具有潜在的临床应用价值。本文对近年来的一个研究热点靶向Rad51在肿瘤治疗研究中的应用进行综述。

关键词： Rad51 同源重组肿瘤联合治疗

Experimental study on the origin of lobe-cleft structures in a sand storm

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Acta Mechanica Sinica 2021年第1期37卷 47-52,I0001页

作者： lin-sen Zhang Jian-Jun Tao Guo-Hua Wang Xiao-Jing Zheng CAPT-HEDPS SKLTCSDepartment of Mechanics and Engineering ScienceCollege of EngineeringPeking UniversityBeijing100871China Center for Particle-Laden Turbulence Lanzhou UniversityLanzhou730000China

Lobes and clefts are characteristic structures at the front of sand *** this paper,their original formation mechanism and geometric features are studied experimentally and theoretically.A rotatable lock-exchange tank is utilized to avoid the strong local disturbances existing in the conventional horizontal apparatus,and the original lobe size is selected as the dominant spanwise wavelength by a statistical method instead of the mean lobe size used in the *** is shown that at the initial formation stage,the measured lobe sizes for different tank geometries and density differences(or Atwood numbers)have a 1/3 scaling law with the Grashof number(Gr)as predicted by a Rayleigh-Taylor(RT)model,especially at moderate Gr range,and substantially depend on the diffusion effect represented by the Schmidt ***,using turbulent Schmidt number and eddy viscosity for atmosphere in the RT model predicts large scale dominant lobes,whose sizes agree qualitatively with those observed in a real sand storm,revealing that the underlying control mechanism for these lobe and cleft structures is intrinsically related to the RT instability.

关键词： Gravity current Lobe-cleft formation Rayleigh-Taylor instability Sand storm Diffusion effect

Sudden deafness as a prodrome of cerebellar artery infarction:Three case reports

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World Journal of Clinical Cases 2022年第15期10卷 4895-4903页

作者： Bang-Liang Li Jia-Yuan Xu sen lin Department of Ear Noseand ThroatThe Third Affiliated Hospital of Wenzhou Medical UniversityWenzhou 325000Zhejiang ProvinceChina

BACKGROUND To summarize the clinical characteristics of acute cerebral infarction(ACI)in patients with sudden deafness(SD)as the first symptom,improve the awareness of the disease,and help diagnosis and *** SUMMARY From 2019 to 2020,three patients with ACI with SD as the first symptom were admitted to our *** tone audiometry,head magnetic resonance imaging(MRI),vertebral artery and carotid artery B-ultrasound,head and neck computed tomography angiography,and other examinations were *** the treatment of SD,hearing and dizziness were not significantly ***,the patients developed symptoms of related cranial nerve injury,and brain MRI showed cerebral infarction in the cerebellopontine angle *** three cases were transferred to the neurology department for relevant conservative *** Patients with ACI with SD as the first symptom usually attend the otolaryngology *** a diagnosis of SD,which is based on an audiological examination,is made and the corresponding treatment is *** reduce the misdiagnosis of this disease,close attention should be paid to the changes in the patient's clinical symptoms and related auxiliary examinations should be performed,such as brain MRI and cerebrovascular *** should pay attention to the type and severity of hearing loss,the accompanying symptoms,age,high-risk factors for cerebral infarction,and related cranial nerve symptoms in patients with *** the patient's early brain MRI does not show abnormalities,monitoring remains *** head MRI should be analyzed quickly based on the changes in the symptoms of the patient,to make an accurate diagnosis and provide the timely and correct treatment for the patients.

关键词： Acute cerebral infarction Anterior inferior cerebellar artery Sudden deafness Case report

Remaining Life Prediction Method for Photovoltaic Modules Based on Two-Stage Wiener Process

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Energy Engineering 2025年第1期122卷 331-347页

作者： Jie lin Hongchi Shen Tingting Pei Yan Wu School of Electrical Engineering and Information Engineering Lanzhou University of TechnologyLanzhou730050China

Photovoltaic (PV) modules, as essential components of solar power generation systems, significantly influence unitpower generation *** service life of these modules directly affects these costs. Over time, the performanceof PV modules gradually declines due to internal degradation and external environmental *** cumulativedegradation impacts the overall reliability of photovoltaic power generation. This study addresses the complexdegradation process of PV modules by developing a two-stage Wiener process model. This approach accountsfor the distinct phases of degradation resulting from module aging and environmental influences. A powerdegradation model based on the two-stage Wiener process is constructed to describe individual differences inmodule degradation processes. To estimate the model parameters, a combination of the Expectation-Maximization(EM) algorithm and the Bayesian method is employed. Furthermore, the Schwarz Information Criterion (SIC) isutilized to identify critical change points in PV module degradation trajectories. To validate the universality andeffectiveness of the proposed method, a comparative analysis is conducted against other established life predictiontechniques for PV modules.

关键词： Photovoltaic modules degradation stochastic processes lifetime prediction