检索结果-南通市图书馆

Phase characterisation of metalenses

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2021年第4期10卷 551-561页

作者： Maoxiong Zhao Mu Ku chen ze-Peng Zhuang Yiwen Zhang Ang chen Qinmiao chen Wenzhe Liu Jiajun Wang ze-ming chen Bo Wang Xiaohan Liu Haiwei Yin Shumin Xiao Lei Shi Jian-Wen Dong Jian Zi Din Ping Tsai State Key Laboratory of Surface Physics Key Laboratory of Micro-and Nano-Photonic Struaures(Ministry of Education)and Department of PhysicsFudan University200433 ShanghaiChina Department of Electronic and Information Engineering The Hong Kong Polytechnic University999077 Hong KongChina School of Physics and State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen University510275 GuangzhouChina Shanghai Engineering Research Center of Optical Metrology for Nanofabrication(SERCOM) 200433 ShanghaiChina State Key Laboratory on Tunable Laser Technology Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information SystemShenzhen Graduate SchoolHarbin Institute of Technology518055 ShenzhenChina

Metalenses have emerged as a new optical element or system in recent years,showing superior performance and abundant ***,the phase distribution of a metalens has not been measured directly up to now,hindering further quantitative evaluation of its *** have developed an interferometric imaging phase measurement system to measure the phase distribution of a metalens by taking only one photo of the interference *** on the measured phase distribution,we analyse the negative chromatic aberration effect of monochromatic metalenses and propose a feature size of *** sensitivities of the phase response to wavelength between the Pancharatnam-Berry phase-based metalens and propagation phase-reliant metalens are directly observed in the ***,through phase distribution analysis,it is found that the distance between the measured metalens and the brightest spot of focusing will deviate from the focal length when the metalens has a low nominal numerical aperture,even though the metalens is ideal without any fabrication *** also use the measured phase distribution to quantitatively characterise the imaging performance of the *** phase measurement system will help not only designers optimise the designs of metalenses but also fabricants distinguish defects to improve the fabrication process,which will pave the way for metalenses in industrial applications.

关键词： character distribution nominal

Ideal nodal rings of one-dimensional photonic crystals in the visible region

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2022年第6期11卷 1178-1185页

作者： Wei-Min Deng ze-ming chen Meng-Yu Li Chao-Heng Guo Zhong-Tao Tian Ke-Xin Sun Xiao-Dong chen Wen-Jie chen Jian-Wen Dong School of Physics&State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen University510275 GuangzhouChina

Three-dimensional(3D)artificial metacrystals host rich topological phases,such as Weyl points,nodal rings,and 3D photonic topological *** topological states enable a wide range of applications,including 3D robust waveguides,one-way fiber,and negative refraction of the surface ***,these carefully designed metacrystals are usually very complex,hindering their extension to nanoscale photonic ***,we theoretically proposed and experimentally realized an ideal nodal ring in the visible region using a simple 1D photonic *** TT-Berrry phase around the ring is manifested by a 2π reflection phase's winding and the resultant drumhead surface *** breaking the inversion symmetry,the nodal ring can be gapped and the n-Berry phase would diffuse into a toroidal-shaped Berry flux,resulting in photonic ridge states(the 3D extension of quantum valley Hall states).Our results provide a simple and feasible platform for exploring 3D topological physics and its potential applications in nanophotonics.

关键词： topological nodal visible

Thermally Conductive,Healable Glass Fiber Cloth Reinforced Polymer Composite based onβ-Hydroxyester Bonds Crosslinked Epoxy with Improved Heat Resistance

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 Polymer Science 2024年第5期42卷 643-654,I0009页

作者： Fang chen Xiao-Yan Pang ze-Ping Zhang Min-Zhi Rong ming-Qiu Zhang Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education GD HPPC LabIGCMESchool of ChemistrySun Yat-sen UniversityGuangzhou510275China Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center Jieyang515200China

To simultaneously endow thermal conductivity,high glass transition temperature(Tg)and healing capability to glass fiber/epoxy(GFREP)composite,dynamic crosslinked epoxy resin bearing reversibleβ-hydroxyl ester bonds was reinforced with boron nitride nanosheets modified glass fiber cloth(GFC@BNNSs).The in-plane heat conduction paths were constructed by electrostatic self-assembly of polyacrylic acid treated GFC and polyethyleneimine decorated ***,the GFC@BNNSs were impregnated with the mixture of lower concentration(3-glycidyloxypropyl)trimethoxysilane grafted BN micron sheets,3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate and hexahydro-4-methylphthalic anhydride,which accounted for establishing the through-plane heat transport pathways and avoiding serious deterioration of mechanical *** resultant GFREP composite containing less boron nitride particles(17.6 wt%)exhibited superior in-plane(3.29 W·m^(-1)·K^(-1))and through-plane(1.16 W·m^(-1)·K^(-1))thermal conductivities,as well as high Tg of 204℃(Tg of the unfilled epoxy=177℃).The reversible transesterification reaction enabled closure of interlaminar cracks within the composite,achieving decent healing efficiencies estimated by means of tensile strength(71.2%),electrical breakdown strength(83.6%)and thermal conductivity(69.1%).The present work overcame the disadvantages of conventional thermally conductive composites,and provided an efficient approach to prolong the life span of thermally conductive GFREP laminate for high-temperature resistant integrated circuit application.

关键词： Thermally conductive composites Boron nitride High-temperature resistance β-Hydroxyl ester bond Healing

Correction to“Efficacy and safety of endoscopic resection in treatment of small gastric stromal tumors:A state-of-the-art review”

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Oncology 2022年第5期14卷 1065-1066页

作者： ze-ming chen Min-Si Peng Li-Sheng Wang Zheng-Lei Xu Department of Gastroenterology The Second Clinical Medical College Jinan University (Shenzhen People's Hospital) Shenzhen 518000 Guangdong Province China. Department of Gastroenterology The Second Clinical Medical College Jinan University (Shenzhen People's Hospital) Shenzhen 518000 Guangdong Province China. 78249073@***.

TO THE EDITOR Correction:The name of our institution"Department of Gastroenterology,Shenzhen People's Hospital,The Second Clinical Medical College,Jinan University,Shenzhen 518000,Guangdong Province,China"[1]should be changed to"Department of Gastroenterology,The Second Clinical Medical College,Jinan University(Shenzhen People's Hospital),Shenzhen 518000,Guangdong Province,China".

关键词： treatment Guangdong Jinan

Effect of aluminum phosphate gel on prevention of early rebleeding after ligation of esophageal variceal hemorrhage

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Surgery 2021年第12期13卷 1651-1659页

作者： Zhu-Liang Zhang Min-Si Peng ze-ming chen Ting Long Li-Sheng Wang Zheng-Lei Xu The Second Clinical Medical College of Jinan University Shenzhen 518000Guangdong ProvinceChina Department of Gastroenterology Shenzhen People's HospitalShenzhen 518020Guangdong ProvinceChina Department of Pathology Shenzhen People’s HospitalShenzhen 518020Guangdong ProvinceChina

BACKGROUND Liver cirrhosis is the main cause of portal *** leading cause of death in patients with liver cirrhosis is its most common complication,esophageal variceal bleeding(EVB).Endoscopic variceal ligation(EVL)is recommended by many guidelines to treat EVB and prevent rebleeding;however,esophageal ulcers occur after *** healing of ulcers and unhealed ulcers lead to high rebleeding and mortality ***,the prevention of early postoperative rebleeding is of great significance in improving the quality of life and prognosis of *** To evaluate the efficacy of aluminum phosphate gel(APG)plus a proton pump inhibitor(PPI)in the prevention of early rebleeding after EVL in patients with *** The medical records of 792 patients who were diagnosed with EVB and in whom bleeding was successfully stopped by EVL at Shenzhen People’s Hospital,Guangdong Province,China from January 2015 to December 2020 were *** to the study inclusion and exclusion criteria,401 cases were included in a PPI-monotherapy group(PPI group),and 377 cases were included in a PPI and APG combination therapy(PPI+APG)*** compared the incidence rates of early rebleeding and other complications within 6 wk after treatment between the two *** two-sample t-test,Wilcoxon rank-sum test,and chisquared test were adopted for statistical *** No significant differences in age,sex,model for end-stage liver disease score,coagulation function,serum albumin level,or hemoglobin level were found between the two *** incidence of early rebleeding in the PPI+APG group(9/337;2.39%)was significantly lower than that in the PPI group(30/401;7.48%)(P=0.001).Causes of early rebleeding in the PPI group were esophageal ulcer(3.99%,16/401)and esophageal varices(3.49%,14/401),while those in the PPI+APG group were also esophageal ulcers(5/377;1.33%)and esophageal varices(4/377;1.06%);such causes were significantly less frequent in the PPI+APG gr

关键词： Esophageal variceal bleeding Esophageal variceal ligation Proton pump inhibitor Endoscopic variceal ligation Aluminum phosphate gel

Hybrid improper ferroelectricity and phase transition behavior of Li_(2)Nd_(2)Ti_(3)O_(10)ceramics with A-site ordered triple-layer Ruddlesden-Popper structure

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materiomics 2024年第1期10卷 145-153页

作者： Bi Hui Zhang Diming Xu Rui ze Guo Lu Liu Xiao Qiang Liu Xiang ming chen Laboratory of Dielectric Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou310058China Key Laboratory of Multifunctional Materials and Structures Ministry of EducationSchool of Electronic Science and EngineeringXi'an Jiaotong UniversityXi'an710049China

Hybrid improper ferroelectricity has been extensively reported through theoretical prediction and experimental investigation in the oxides with Ruddlesden-Popper(R-P)***,the experimentally reported ferroelectric materials based on triple-layer R-P structures are rare,and the weak ferroelectricity impedes its practical *** the present work,the single-phase Li_(2)Nd_(2)Ti_(3)O_(10)ceramics with A-site cation ordered triple-layer R-P structure was obtained by spark plasma sintering technique,and the crystal structure of P2_(1)ab symmetry was revealed by neutron powder diffraction and transmission electron microscope ***,the switchable ferroelectricity in Li_(2)Nd_(2)Ti_(3)O_(10)ceramics has been observed at room temperature,and the saturated polarization-electric field hysteresis loop was obtained with P_(r)=0.4μC/cm^(2)under the electric field of 250 kV/*** phase transition behavior of Li_(2)Nd_(2)Ti_(3)O_(10)oxides was revealed by the temperature-dependence Raman and dielectric spectra combined with the piezoelectric property.

关键词： Hybrid improper ferroelectricity A-site ordered Ruddlesden-Popper structure Phase transition behavior

A methodology for laser tool setters calibration and its precise mathematical model

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 2024年第7期37卷 564-581页

作者： Tao FANG Zixi FANG ze Zhong chen Zhiyong CHANG School of Mechanical Engineering Northwestern Polytechnical UniversityXi’an 710072China Gina Cody School of Engineering and Computer Science Concordia UniversityMontrealQuebec H3G 1M8Canada Changsha Optimum CNC Corporation Changsha 410221China Institute for Aero-engine Smart Assembly of Shaanxi Province Xi’an 710072China

On-machine tool setting is a pivotal approach in achieving intelligent manufacturing,and laser tool setters have become a crucial component of smart machine *** tool setters play a crucial role in precisely measuring the dimensions of cutting tools during the part machining process,focusing on tool length and *** a measuring instrument,the positions of the laser axis of the laser tool setter need to be accurately calibrated before ***,in actual calibration scenarios,traditional calibration methods face challenges due to installation errors in the tool setter and geometric errors in the measuring *** address this issue,this study proposes a novel calibration ***,the calibration mechanism of the laser beam axis is *** on the accurate mathematical model of the laser beam and the measuring rod,and using the polygon clipping algorithm,the mathematical mechanism of the laser tool setter’s work is ***,a novel method is introduced to calculate the compensation distance between the laser beam reference point and the rod bottom center point at each moment during ***,by utilizing the kinematic chain of the tool setter calibration system,a new calibration method is developed to accurately calibrate the position of the laser beam axis in the machine tool coordinate ***,the accuracy of the calibration method is verified through simulation experiments and calibration *** method improves the calibration accuracy of the tool setter,and the mathematical model of the laser tool setter can be extended to the measurement of tools,thereby improving the precision of tool *** research significantly improves the efficient production performance of smart machine tools.

关键词： On-machine tool setting Smart machine tools Mathematical model Calibration method Laser tool sette

Light-induced stepped thermal relaxation in a Hofmann-type metal-organic framework

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第6期67卷 1983-1989页

作者： Wen Cui Wei-Wei Wu ze-Yu Ruan Yan-Cong chen Guang-Jun zeng Guan-Xi chen Si-Guo Wu Zhao-Ping Ni ming-Liang Tong Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education School of ChemistryInstitute of Green Chemistry and Molecular EngineeringGuangdong Basic Research Center of Excellence for Functional Molecular EngineeringSun Yat-sen UniversityGuangzhou510275China

Spin-crossover(SCO)materials with light-induced multistability have potential applications in multi-addressable opto-magnetic memory devices and multiple ***,we reported a three-dimensional Hofmann-type metal-organic framework(MOF)[Fe(bpy){Pt(CN)_(4)}]·coumarin(1·coumarin,bpy=4,4′-bipyridine),which exhibits an incomplete and hysteretic SCO *** importantly,the light-induced stepped thermal relaxation(LISTR)with obvious magnetic plateau for a hidden intermediate spin state is firstly *** hidden spin state is also observed for the first time in the thermal relaxation after light-assisted spin state annealing(LASSA).Meanwhile,an extremely rare bi-directional light-induced excited spin-state trapping(LIESST)with the highest reverse-LIESST temperature is ***,five spin states can be captured in 1·coumarin and the tristability can be modulated below 102 K through the excitation-relaxation ***,the light-and temperatureinduced multistability provides a new strategy for developing multistable materials.

关键词： light magnetic multistability iron metal-organic framework spin-crossover

Flexible and multifunctional triboelectric nanogenerator based on liquid metal/polyvinyl alcohol hydrogel for energy harvesting and self-powered wearable human-machine interaction

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第3期43卷 1186-1196页

作者： Hou-Wang Zhou Cong Zhao ze-Yu Zhao Jun-chen Jiang Hui-Le Jin Shun Wang Shuang Pan Min-Yi Xu Yi-Huang chen Hai-ming Jin Department of Orthopaedics The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical UniversityWenzhou325027China College of Chemistry and Materials Engineering Wenzhou UniversityWenzhou325035China Dalian Key Laboratory of Marine Micro/Nano Energy and Self-Powered Systems Marine Engineering CollegeDalian Maritime UniversityDalian116026China

Hydrogel-based triboelectric nanoge nerator(TENG)has a promising applied prospect in wearable electronic ***,its low performance,poor stability,insufficient recyclability and inferior self-healing seriously hinder its ***,we report a robust route to a liquid metal(LM)/polyvinyl alcohol(PVA)hydrogel-based TENG(LP-TENG).Owing to the intrinsically liquid feature of conductive LM within the flexible PVA hydrogel,the as-prepared LP-TENG exhibited comprehensiye advantages of adaptability,biocompatibility,outstanding electrical performance,superior stability,recyclability and diverse applications,which were unattainable by traditional ***,the LP-TENG delivered appealing open circuit voltage of 250 V,short circuit current of 4μA and transferred charge of 120 nC with high stability,outperforming most advanced TENG *** LP-TENG was successfully employed for versatile applications with multifunctionality,including human motion detection,handwriting recognition,energy collection,message transmission and human-machine *** work presents significant prospects for crafting advanced materials and devices in the fields of wearable electronics,flexible skin and smart robots.

关键词： Liquid metal Hydrogel Wearable TENG Multifunctionality Human-machine interaction