检索结果-南通市图书馆

Engineering Quantum Criticality for Quantum Dot Power Harvesting

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2024年第2期41卷 14-25页

作者：王金义年磊磊吕京涛 School of Physics and Astronomy Yunnan UniversityKunming 650091China School of Physics Institute for Quantum Science and Engineeringand Wuhan National High Magnetic Field CenterHuazhong University of Science and TechnologyWuhan 430074China

Coupling of quantum-dot circuits to microwave photons enables us to investigate photon-assisted quantum ***,we revisit this typical circuit quantum electrodynamical setup by introducing the Kerr nonlinearity of *** exploiting quantum critical behavior,we propose a powerful scheme to control the power-harvesting efficiency in the microwave regime,where the driven-dissipative optical system acts as an energy *** drives electron transport against a load in the quantum-dot *** energy transfer and,consequently,the harvesting efficiency are enhanced near the critical *** the critical point moves towards to low input power,high efficiency within experimental parameters is *** results complement fundamental studies of photon-to-electron conversion at the nanoscale and provide practical guidance for designs of integrated photoelectric devices through quantum criticality.

关键词： quantum critical microwave

Unlocking the Potential of Two-Dimensional Janus Superlattices:Directly Visualizing Phonon Transitions

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2023年第8期40卷 46-52页

作者：刘应州岳津丞刘一浓年磊磊胡世谦 School of Physics and Astronomy Yunnan UniversityKunming 650091China

Recent research has focused on using Anderson's localization concept to modulate coherent phonon transport by introducing disorder into periodic ***,designing and identifying the disorder's strength remain challenging,and visual evidence characterizing phonon localization is ***,we investigate the effect of disorder on coherent phonon transport in a two-dimensional Janus MoSSe/WSSe superlattice with a defined disorder *** non-equilibrium molecular dynamics,we demonstrate that strong disorder can lead to strong phonon localization,as evidenced by smaller thermal conductivity and significantly different dependence on defect ratio in strongly disordered ***,we propose a novel defect engineering method to determine whether phonon localization *** work provides a unique platform for modulating coherent phonon transport and presents visual evidence of the phonon transition from localization to *** findings will contribute to development of phonon transport and even phononics,which are essential for thermoelectric and phononic applications.

关键词： phonon coherent defect

Surgical treatment of bipolar segmental clavicle fracture:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2022年第29期10卷 10529-10534页

作者： Lin Liang Xin-lei Chen Ye Chen nian-nian Zhang Department of Orthopedics Shangyu People’s Hospital of Shaoxing CityShaoxing 312000Zhejiang ProvinceChina Department of Orthopedics Haimen People’s HospitalNantong 226000Jiangsu ProvinceChina

BACKGROUND Shoulder injuries caused by trauma are common,including clavicle *** so,bipolar segmental fracture of the clavicle is extremely rare and seldom ***,there is still a controversial issue about how to treat these bipolar segmental clavicle *** SUMMARY A 56-year-old security guard arrived at our emergency room after falling on his electric *** was no loss of consciousness or other *** had no numbness in his fingers.X-rays and 3D computed tomography revealed that the patient’s right shoulder had a bipolar segmental clavicle *** surgical procedure included both open reduction and internal *** the 1-year follow-up,he had a full range of motion and minimal discomfort in the injured *** We provide a rare case of bipolar clavicle facture in the right *** hold the opinion that such patients would get better clinical and radiological outcomes by early and correct operation.

关键词： Bipolar segmental clavicle fracture Arm sling Open reduction and internal fixation Acromioclavicular hook plate Case report

Dependence of creep age formability on initial temper of an Al-Zn-Mg-Cu alloy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2016年第5期29卷 1445-1454页

作者： lei Chao Yang He Li Heng Shi nian Fu Jin Zhan Lihua State Key Laboratory of Solidification Processing School of Materials Science and Engineering Northwestern Polytechnical University State Key Laboratory of High Performance Complex Manufacturing School of Mechanical and ElectricalCentral South University

The initial temper of the material may directly affect the whole creep age forming （CAF） process. In terms of creep deformation and stress relaxation, using the constant-stress creep aging and constant-strain stress relaxation aging tests, the relationship between initial temper and CAF formability is investigated for an Al-Zn-Mg-Cu alloy at 165 ℃ for 18 h. Three tempers are selected as the initial tempers in CAF, viz., solution, retrogression and re-solution. The CAF formability of this alloy with initial temper of retrogression is the best, and the creep strain of the retrogression tempered specimen after creep aging of 18 h is about 1.21 and 1.34 times than that of the solution and the re-solution tempered specimens, respectively. The calculated stress exponents of this alloy with three initial tempers range from 7.3 to 9.5, indicating that the CAF of this alloy is mainly controlled by the dislocation creep. The various formability for three initial tempers are attributed to different inhibitions of the transgranular precipitates on the dislocation movement. For the retrogression temper, the initial fine and uniformly distributed precipitates are seriously coarsened after 6 h of CAF, which minimally inhibit the dislocation movement. While, for the re-solution temper, the fine precipitates are re-precipitated in the matrix of the alloy, which observably hinder the dislocation movement and lead to the worst formability.

关键词： AI-Zn-Mg-Cu alloy Creep age forming Formability Initial temper Precipitate

Specific patterns of XC02 observed by GOSAT during 2009-2016and assessed with model simulations over China

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2020年第3期63卷 384-394页

作者： nian BIE Liping lei Zhonghua HE Zhaocheng ZENG Liangyun LIU Bing ZHANG Bofeng CAI Key Laboratory of Digital Earth Science Institute ofRemote Sensing and Digital EarthChinese Academy of SciencesBeijing 100094China University of Chinese Academy of Sciences Beijing 100094China Division of Geological and Planetary Sciences California Institute of TechnologyPasadena CA91125USA The Center for Climate Change and Environmental Policy Chinese Academy for Environmental PlanningMinistry of Environmental ProtectionBeijing 100012China

Spatiotemporal patterns of column-averaged dry air mole fraction of CO2(XCO2)have not been well characterized on a regional scale due to limitations in data availability and *** paper addresses these issues by examining such patterns in China using the long-term mapping XCO2 dataset(2009-2016)derived from the Greenhouse gases Observing SATellite(GOSAT).XCO2 simulations are also constructed using the high-resolution nested-grid GEOS-Chem *** following results are found:Firstly,the correlation coefficient between the anthropogenic emissions and XCO2 spatial distribution is nearly zero in summer but up to 0.32 in ***,on average,XCO2 increases by 2.08 ppm every year from2010 to 2015,with a sharp increase of 2.6 ppm in ***,in the analysis of three typical regions,the GOSAT XCO2 time series is inbetter agreement with the GEOS-Chem simulation of XCO2 in the Taklimakan Desert region(the least difference with bias 0.65±0.78 ppm),compared with the northern urban agglomerationregion(-1.3±1.2 ppm)and the northeastern forest region(-1.4±1.4 ppm).The results are likely attributable to uncertainty in both the satellite-retrieved XCO2 data and the model simulation data.

关键词： GEOS-Chem GOSAT OCO-2 Specific pattern XCO2

More than just aligning the teeth:Clear aligners with multifunctional prowess

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第8期17卷 7665-7674页

作者： Yang Chen lei-Ming Cao nian-nian Zhong Zi-Zhan Li Lin-Lin Bu Fang-Yi Huo Hong He State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration Key Laboratory of Oral Biomedicine Ministry of EducationHubei Key Laboratory of StomatologySchool and Hospital of StomatologyWuhan UniversityWuhan 430079China Department of Oral and Maxillofacial-Head Neck Oncology School and Hospital of StomatologyWuhan UniversityWuhan 430079China Department of Zhuankou Clinical Branches School and Hospital of StomatologyWuhan UniversityWuhan 430000China Department of Orthodontics School and Hospital of StomatologyWuhan UniversityWuhan 430079China

With the increasing demand for beauty and health,clear aligners(CAs)have been widely applied among patients with ***,patients treated with CAs also face some potential complications,such as demineralization,dental caries,and periodontal *** addition,some patients have additional needs to improve their quality of life,such as bleaching *** order to prevent or solve these problems,the modification of CAs is a promising method because their extensive long-term contact with tooth surfaces makes them ideal devices for implementing adjuvant medical *** this review,we discuss various advanced CAs with medical functions based on the clinical needs of *** far as we know,the additional functions of CAs mainly include antibacterial,remineralization,whitening,and accelerating tooth *** functions are achieved by two major pathways,the combination of CAs with drugs/biomaterials and increasing the capacity or affinity of *** addition,we discuss the current limitations of in vitro experiments which are designed to explore the effectiveness and properties of novel CAs,and the challenges of bringing a multifunctional appliance from proposal to clinical *** the end of this review,we provide insights into the broader prospects for the improvement of CAs.

关键词： advanced clear aligners medical device modification drug delivery system personalized medicine

Synergistic effect between Er-doped MoS_(2)nanosheets and interfacial Mo-N coupling phases for enhanced electrocatalytic hydrogen evolution

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2024年第3期43卷 1301-1308页

作者： nian-Peng Li lei Zhang Hua Zhang Fan-Fei Min lei Wang Sam Toan Xi-Jun Liu Guang-Zhi Hu State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines School of Materials Science and EngineeringAnhui University of Science and TechnologyHuainan232001China Donghai Laboratory Zhoushan316021China Department of Chemical Engineering University of Minnesota-DuluthDuluthMN55812USA School of Ecology and Environmental Science Institute for Ecological Research and Pollution Control of Plateau LakesYunnan UniversityKunming650504China MOE Key Laboratory of New Processing Technology for Non-Ferrous Metals and Materials Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured MaterialsGuangxi UniversityNanning530004China

Hydrogen production via electrochemical water splitting is a promising and green *** one of the most representative transition metal sulfides layered materials,Molybdenum disulfide(MoS_(2))has immense potential for the hydrogen evolution reaction(HER).We successfully prepared a nitrogen-doped carbon(NC)in situ-grown erbium-doped MoS_(2)polyhedral structure(Er-MoS_(2)/NC)that incorporates an interfacial Mo-N coupling phase.

关键词： hydrogen interfacial coupling

Low temperature sintering and performance of aluminum nitride/borosilicate glass

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第1期10卷 109-113页

作者： Hong-sheng ZHAO lei CHEN nian-zi GAO Kai-hong ZHANG Zi-qiang LI Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China

Aluminum nitride （AlN）/borosilicate glass composites were prepared by the tape casting process and hot-press sintered at 950 ℃ with AIN and SiO2-B203-ZnO-Al2O3-Li2O glass as starting materials. We characterized and analyzed the variation of the microstructure, bulk density, porosity, dielectric constant, thermal conductivity and thermal expansion coefficient （TEC） of the ceramic samples as a function of AIN content. Results show that AIN and SiO2-B2O3-ZnO-Al2O3-Li2O glass can be sintered at 950 ℃, and ZnAI204 and Zn2SiO4 phase precipitated to form glass-ceramic. The performance of the ceramic samples was determined by the composition and bulk density of the composites. Lower AlN content was found redounding to liquid phase sintering, and higher bulk density of composites can be accordingly obtained. With the increase of porosity, corresponding decreases were located in the dielectric constant, thermal conductivity and TEC of the ceramic samples. When the mass fraction of AlN was 40%, the ceramic samples possessed a low dielectric constant （4.5-5.0）, high thermal conductivity （11.6 W/（m.K）） and a proper TEC （3.0× 10^-6 K^-1 which matched that of silicon）. The excellent performance makes this kind of low temperature co-fired ceramic a promising candidate for application in the micro-electronics packaging industry.

关键词： Aluminum nitride (AlN) Borosilicate glass Low temperature sintering Performance

Synthesis of carbon-supported Pd/SnO_2 catalyst for highly selective hydrogenation of 2,4-difluoronitrobenzene

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2014年第8期25卷 1137-1140页

作者： Jia Zhao lei Ma Xiao-Liang Xu Feng Feng Xiao-nian Li Industrial Catalysis Institute of Zhejiang University of Technology

Halogenated anilines have a wide range of applications in the production of pharmaceuticals and agrochemical substances, and thus it is of great importance to develop highly active and selective catalysts for the hydrogenation of halogenated nitrobenzenes. We approach this challenge by probing noble metal/non-noble metal oxide nanoparticles（NPs） catalysts. Carbon-supported Pd/SnO2catalysts were synthesized by the chemical reduction method, and their catalytic activity was evaluated by the hydrogenation reaction of 2,4-difluoronitrobenzene（DFNB） to the corresponding 2,4-difluoroaniline（DFAN）, showing a remarkable synergistic effect of the Pd and SnO2 NPs. The as-prepared Pd/SnO2/C catalysts were characterized using TEM, XRD, H2 TPD and XPS techniques. Modifications to the electronic structure of the Pd atoms through the use of SnO2 led to the suppression of the hydrogenolysis of the C–F bond and the acceleration of nitrosobenzene（DFNSB） conversion and consequently, resulted in the inhibition of the formation of reactive by-products and may be responsible for the enhancements observed in selectivity.

关键词： Tin dioxide Palladium Selective hydrogenation 2.4-Difluoronitrobenzene