检索结果-南通市图书馆

Padé approximations of quantized-vortex solutions of the Gross–Pitaevskii equation

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2021年第8期73卷 171-181页

作者： Weiru Chen Shanquan Lan Xiyi Liu Jiexiong Mo xiaobao xu Guqiang Li Institute of Theoretical Physics Lingnan Normal UniversityZhanjiang524048GuangdongChina

Quantized vortices are important topological excitations in Bose–Einstein condensates. The Gross–Pitaevskii equation is a widely accepted theoretical tool. High accuracy quantized-vortex solutions are desirable in many numerical and analytical studies. We successfully derive the Padéapproximate solutions for quantized vortices with winding numbers ω = 1, 2, 3, 4, 5, 6 in the context of the Gross–Pitaevskii equation for a uniform condensate. Compared with the numerical solutions, we find that(1) they approximate the entire solutions quite well from the core to infinity;(2) higher-order Padé approximate solutions have higher accuracy;(3) Padé approximate solutions for larger winding numbers have lower accuracy. The healing lengths of the quantized vortices are calculated and found to increase almost linearly with the winding number. Based on experiments performed with 87Rb cold atoms, the healing lengths of quantized vortices and the number of particles within the healing lengths are calculated, and they may be checked by experiment. Our results show that the Gross–Pitaevskii equation is capable of describing the structure of quantized vortices and physics at length scales smaller than the healing length.

关键词： Gross-Pitaevskii equation Padéapproximation quantized-vortex solution

Broadband and sensitive two-dimensional halide perovskite photodetector for full-spectrum underwater optical communication

在线全文

学校读者我要写书评

暂无评论

Nano Research 2021年第4期14卷 1210-1217页

作者： Dejian Yu Fei Cao Yu Gu Zeyao Han Jiaxin Liu Bo Huang xiaobao xu Haibo Zeng Institute of Optoelectronics&Nanomaterials MIIT Key Laboratory of Advanced Display Materials and DevicesSchool of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China

Full-spectrum underwater optical communication(UOC)is of great significance for major strategic needs including resource development,scientific exploration,and homeland *** the core of the full-spectrum UOC system,photodetectors(PDs)are plagued by stringent requirements including a broadband response,intrinsic water resistance,and a high *** this work,two-dimensional(2D)halide perovskites(HPs)and corresponding PDs are constructed by stearamine(SA),representing the rarely explored long-chain aliphatic amine series,to own waterproofness,ultralow noise,and superior optoelectronic performance,which consequently enable a high suitability for *** dimensionality and composition modulations to extend the absorption onset down to 1.5 eV,a broadband response covering the entire transmission window of water(>1.55 eV)for full-spectrum UOC can be ***,featuring a high responsivity of 3.27 A·W^(-1),a peak external quantum efficiency(EQE)of 630%,fast rise/decay times of 0.35 ms/0.54 ms,a superior detectivity up to 1.35×10^(12)Jones and the capability to distinguish various waveforms and light intensities,the PDs present sensitive and persistent photoresponse *** a result,proof-of-concept wireless transmission of ASCII codes in water is demonstrated.

关键词： two-dimensional(2D)halide perovskite photodetector water stability broadband photoresponse underwater optical communication

An asymmetric A-D-π-A type non-fullerene acceptor enables high-detectivity near-infrared organic photodiodes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2023年第1期66卷 242-250页

作者： Ziping Zhong Xin Liu Ling Li Zeyao Han Yin He xiaobao xu Jiefeng Hai Rihong Zhu Jiangsheng Yu School of Electronic and Optical Engineering Nanjing University of Science and TechnologyNanjing 210094China College of Chemistry and Bioengineering Guilin University of TechnologyGuilin 541004China School of Material Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China

Narrow bandgap non-fullerene acceptors(NFAs)are relevant as key materials components for the fabrication of near-infrared(NIR)organic solar cells(OSCs)and organic photodiodes(OPDs)thanks to their complementary absorption,tunable energy levels,and enhanced ***,high-performance NIR photodetectors are still scarce due to the absence of narrow bandgap ***,an asymmetric A-D-π-A type NFA,named ABTPV-S,with a broad optical absorption approaching 1,000 nm is designed and synthesized through integrating alkylthio side chains and a vinyleneπ-*** optimal inverted OPD device exhibits an excellent performance with a photoresponsivity of 0.39 AW-1,a noise current of 2.25×10^(-14)A Hz^(-0.5),a specific detectivity(D*)of 3.43×10^(12)Jones at 840 nm,and linear dynamic range(LDR)of 140 d *** addition,the rise and fall times for ABTPV-S-based OPDs also reach 1.07 and 0.71μs,***-S-based OPDs exhibit a high D*over 1012Jones at 950 nm,which is a competitive result for the self-powered photodiode-type NIR *** findings highlight the outstanding potential of asymmetric A-D-π-A type NIR NFAs for high-performance OPDs competing with their silicon counterparts.

关键词： asymmetric non-fullerene acceptor high-detectivity near-infrared organic solar cells organic photodiodes

Alternate redox electrolytes in dye-sensitized solar cells

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2012年第32期57卷 4131-4142页

作者： LU JianFeng BAI Jie xu xiaobao LI ZhiHong CAO Kun CUI Jin WANG MingKui Michael Griitzel Center for Mesoscopic Solar Cells Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074China

Dye-sensitized mesoscopic solar cell(DSC) has been intensively investigated as a promising photovoltaic *** electrolyte is important to determine the photovoltaic(PV) performance of the DSC devices,which has become the focus of this *** this contribution,recent advances in understanding and controlling of various redox couples are ***,we extend our discussion on the trends that enable iodide-free redox couples to be controllable and feasible for applications in the DSC with promising features.

关键词：染料敏化太阳能电池氧化还原电对电解光伏电池 DSC

High-definition colorful perovskite narrowband photodetector array enabled by laser-direct-writing

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第6期15卷 5476-5482页

作者： xiaobao xu Yuhang Dong Yuanzhou Zhang Zeyao Han Jiaxin Liu Dejian Yu Yi Wei Yousheng Zou Bo Huang Jun Chen Haibo Zeng Key Laboratory of Advanced Display Materials and Devices Ministry of Industry and Information TechnologyInstitute of Optoelectronics&NanomaterialsCollege of Material Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China

Narrowband photodetectors as specific spectral sensing pixels have drawn intense attention in multispectral detection due to their distinct characteristic of filter-free spectrum discrimination,in which the emerging halide lead perovskites witness a booming development in their performance and wavelength-selectivity from blue to near-infrared ***,the challenge in integrating perovskite narrowband photodetectors on one chip imposes an impediment on practical *** this work,the combination of laser-direct-writing and ion exchange is proposed as an efficient way to fabricate high-definition colorful sensing array with perovskite narrowband photodetector unit as *** laser irradiation,the photolysis of halocarbon solvent(CHCl_(3),CH_(3)CH_(2)I,etc)releases the halide ions,which brings the ion exchange and gives rise to slow-varying bandgap in single perovskite photoactive *** ion exchange can be controlled via laser irradiation time and focus point,thus enabling precisely engineerable *** optimizing the process,it is successfully applied to develop patterned perovskite narrow blue and green photodetectors array with a high-definition of~53 *** believe this result will make a great step forward to integrate multifunctional perovskite devices on one chip,which will pave the way for perovskite optoelectronic device to the commercial application.

关键词： photodetector narrowband imaging array laser-direct-writing perovskite

Molecular Dynamics Simulations of Displacement Cascade in Ni-Based Concentrated Solid Solution Alloys

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2024年第1期37卷 82-89页

作者： Chaoquan Zhao Rongxuan Xie Chuanlong xu xiaobao Tian Qingyuan Wang Wentao Jiang Haidong Fan Department of Mechanics Sichuan UniversityChengdu 610065China

Single-phase concentrated solid solution alloys(SP-CSAs),including high-entropy alloys,have received extensive attention due to their excellent irradiation *** this work,displacement cascade simulations are conducted using the molecular dynamics method to study the evolution of defects in Ni-based *** with pure Ni,the NiCr,NiCo,and NiCu alloys exhibit a larger number of Frankel pairs(FPs)in the thermal peak stage,but a smaller number of surviving ***,the NiFe alloy displays the opposite *** explain these different observations for NiFe and other alloys,the formation energy and migration energy of interstitials/vacancies are *** the NiFe alloy,both the formation energy and migration energy barrier are *** the other hand,in NiCr and other alloys,the formation energy of interstitials/vacancies is lower,as is the migration energy barrier of *** energy analysis agrees well with previous *** present work provides new insights into the mechanism behind the irradiation resistance of binary Ni-based SP-CSAs.

关键词： Molecular dynamics simulation Displacement cascade Point defect Ni-based concentrated solid solution alloys

INFINITE PERIODIC SOLUTIONS TO A CLASS OF SECOND-ORDER NEUTRAL DIFFERENTIAL EQUATIONS

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Annals of Differential Equations 2005年第3期21卷 397-402页

作者： Shu xiaobao xu Yuantong Dept. of Math. Zhongshan University Guangzhou 510275

By means of variational structure and Z2 group index theory, we obtain infinite periodic solutions to a class of second-order neutral differential equations.

关键词： variational structure Z2 group index theory neutral differential equations critical points periodic solutions

Efficient Photolytic Halogenation and Oxidation of Unactivated Alkyl sp^(3) C—H Bonds with Iodine(III)

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2024年第5期42卷 505-510页

作者： Hao Jia Nan Li Chunmei Tang Yajuan Wang Yonghao Xi Rongbao Liao Wei xu Fufang Wu xiaobao Shen Hongbin Zhai Biomass Oligosaccharides Engineering Technology Research Center of Anhui Province Engineering Research Center of Biomass Conversion and Pollution Prevention of Anhui Educational InstitutionsFuyang Normal UniversityFuyangAnhui236037 China Institute of Marine Biomedicine Shenzhen PolytechnicShenzhenGuangdong518055 China State Key Laboratory of Chemical Oncogenomics Shenzhen Engineering Laboratory of Nano Drug Slow-ReleasePeking University Shenzhen Graduate SchoolShenzhenGuangdong518055 China

A metal-free,green,and sustainable functionalization of unactivated alkyl sp^(3) C—H bonds is reported using iodine(III)as a feasible dehydrogenation agent under visible light or KBr,and alkyl chlorides,bromides,alcohols,and ketones could be constructed by addition of different coupling *** and safe iodobenzene diacetate was used to form a radical to activate the alkyl sp^(3) C—H bond in a highly efficient manner,which can construct different alkylation products by adding corresponding coupling reagents.

关键词： Alkyl sp^(3)C—H bonds Chlorination Bromination Oxidation Iodine(III) C—H activation Radical Photocatalysis

Overstory functional groups indicate the legacy of land use in a secondary tropical forest in southwestern China

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 Forestry Research 2024年第5期35卷 91-105页

作者： Yun Deng Wenfu Zhang Min Cao Jinlong Dong Hui Chen xiaobao Deng Jiajia Liu Xiaoyang Song Shangwen Xia Liqing Sha Shengdong Yuan Luxiang Lin CAS Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMengla 666303People’s Republic of China Center for Plant Ecology Core Botanical GardensChinese Academy of SciencesMengla 666303People’s Republic of China National Forest Ecosystem Research Station at Xishuangbanna Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMengla 666303People’s Republic of China Department of Life Sciences Fudan UniversityShanghai 570228People’s Republic of China Department of Life Sciences University of Chinese Academy of SciencesBeijing 100049People’s Republic of China

Anthropogenic disturbances are widespread in tropical forests and influence the species composition in the ***,the impacts of historical disturbance on tropical forest overstory recovery are unclear due to a lack of disturbance data,and previous studies have focused on understory *** this study,the purpose was to deter-mine the influence of historical disturbance on the diver-sity,composition and regeneration of overstory species in present *** the 20-ha Xishuangbanna tropical sea-sonal rainforest dynamics plot in southwestern China,the historical disturbance boundaries were delineated based on panchromatic photographs from *** that drove species clustering in the overstory layer(DBH≥40 cm)were analyzed and the abundance,richness and composition of these species were compared among different tree groups based on multiple regression tree *** coefficient of variation of the brightness value in historical panchro-matic photographs from 1965 was the primary driver of spe-cies clustering in the overstory *** abundance and richness of overstory species throughout the regeneration process were similar,but species composition was always *** the proportion of large-seeded and vigorous-sprouting species showed no significant differ-ence between disturbed and undisturbed forests in the tree-let layer(DBH<20 cm),the difference became significant when DBH *** findings highlight that historical disturbances have strong legacy effects on functional group composition in the overstory and the recovery of overstory species was *** group composi-tion can better indicate the dynamics of overstory species replacement during secondary succession.

关键词： Historical disturbance Legacy effects Secondary forests Overstory species Functional groups