检索结果-南通市图书馆

Optical storage arrays: a perspective for future big data storage

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) 2014年第1期3卷 200-210页

作者： Min Gu xiangping li Yaoyu Cao Centre for Micro-Photonics Faculty of ScienceEngineering and TechnologySwinburne University of TechnologyHawthornVIC 3122Australia

The advance of nanophotonics has provided a variety of avenues for light–matter interaction at the nanometer scale through the enriched mechanisms for physical and chemical reactions induced by nanometer-confined optical probes in nanocomposite *** emerging nanophotonic devices and materials have enabled researchers to develop disruptive methods of tremendously increasing the storage capacity of current optical *** this paper,we present a review of the recent advancements in nanophotonics-enabled optical storage ***,we offer our perspective of using them as optical storage arrays for next-generation exabyte data centers.

关键词： big data centers optical data storage optical storage arrays super-resolution

Flow characteristics of mixed particles with a simulated cold state in moving bed reactor

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Particuology 2022年第12期71卷 11-19页

作者： Yaqing Zhang Jialong Zhu Peng liang Tiantian Jiao xiangping li College of Chemical and Biological Engineering Shandong University of Science and TechnologyQingdao 266590China

The funnel flow of high-temperature circulating ash and coal in moving bed with height restrictions directly influences the efficiency of coal pyrolysis and scale-up design of *** is one of the technical bottlenecks in the use of moving *** order to provide data support for the particle flow and pyrolysis model close to the actual working conditions in the future,this study describes the flow characteristics of solid-solid mixed particles in a cold two-dimensional moving *** results indicate that flow char-acteristics of mixed particles in the quartz sand-coal system are better than those in the cold circulating ash-coal *** optimized conditions were obtained,the insert half angle is 20° and a heat carrier to coal ratio of 6:*** the mixture progressed downstream,secondary separation of the heat carrier and coal become ***,mixture residence time has been investigated to explore the relationship between regional residence time and to predict accurately the actual pyrolysis progress in pyrolyzer.

关键词： Flow characteristics Moving bed Secondary separation Residence time

Isotope effect of the stereodynamics in the reactions F+HCl→HF+Cl and F+DCl→DF+Cl

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 Science Bulletin 2010年第34期55卷 3868-3874页

作者： YIN ShuHui GUO MingXing li Lei li xiangping ZHANG YingHui Department of Physics Dalian Maritime University Dalian 116026 China Environmental Science and Engineering College Dalian Maritime University Dalian 116026 China

Using a new ground-state ab initio potential energy surface reported by Deskevich et al.,the product polarizations in the reactions F+HCl→HF+Cl and F+DCl→DF+Cl were studied by employing the quasi-classical trajectory *** a collision energy of 10 kcal/mol,the four generalized polarization-dependent differential cross-sections(2π/σ)(dσ00/dωt),(2π/σ)(dσ20/dωt),(2π/σ)(dσ22+/dωt)and(2π/σ)(dσ21-/dωt)were calculated in the center-of-mass *** distribution of the angle between k and j',P(θr),the distribution of the dihedral angle denoting the k-k'-j' correlation,P(φr),and the angular distribution of the product rotational vectors in the form of polar plots P(θr,φr)were also *** evident influence of isotope substitution on the product polarization is *** effect may result from the different mass factors of the two reactions.

关键词：同位素效应 DCL 反应盐酸高频氯准经典轨迹法替代产品

A novel environmental control system based on membrane dehumidification

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2015年第3期28卷 712-719页

作者： Yuan Weixing Yang Bo Guo Binghan li xiangping Zuo Yansheng Hu Wenchao Laboratory of Ergonomics and Environmental Control School of Aeronautic Science and Engineering Beihang University Jincheng Electromechanical Center of Nanjing

Abstract This paper conducts a simulation study of a novel aircraft environmental control system based on membrane dehumidification （MD-ECS）, and compares the system with the up-to-date four-wheel high pressure de-water system （4WHPDW-ECS）. Mathematical models for the two sys- tems are established, and a system simulation using a numerical technique is performed to analyze and compare the cooling performance of the two systems. Simulation results show that the cooling capacity of MD-ECS is much higher than that of 4WHPDW-ECS under the same working conditions, indicating that the novel system is theoretically feasible and promising. The effects of the sweep ratio of the membrane dehumidifier on the dehumidification and cooling performance of the system is also investigated.

关键词： Aircraft Cooling performance Environmental control sys-tem High pressure de-water Membrane dehumidificationSweep ratio

Cylindrical vector beams reveal radiationless anapole condition in a resonant state

在线全文

学校读者我要写书评

暂无评论

Opto-Electronic Advances 2022年第4期5卷 69-75页

作者： Yudong Lu Yi Xu Xu Ouyang Mingcong Xian Yaoyu Cao Kai Chen xiangping li Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou 510632China Department of Electronic Engineering College of Information Science and TechnologyJinan UniversityGuangzhou 510632China

Nonscattering optical anapole condition is corresponding to the excitation of radiationless field distributions in open resonators,which offers new degrees of freedom for tailoring light-matter *** mechanisms for achieving such a condition relies on sophisticated manipulation of electromagnetic multipolar moments of all orders to guarantee superpositions of suppressed moment strengths at the same *** contrast,here we report on the excitation of optical radiationless anapole hidden in a resonant state of a Si nanoparticle utilizing a tightly focused radially polarized(RP)*** coexistence of magnetic resonant state and anapole condition at the same wavelength further enables the triggering of resonant state by a tightly focused azimuthally polarized(AP)beam whose corresponding electric multipole coefficient could be *** a result,high contrast inter-transition between radiationless anapole condition and ideal magnetic resonant scattering can be achieved experimentally in visible *** proposed mechanism is general which can be realized in different types of *** results showcase that the unique combination of structured light and structured Mie resonances could provide new degrees of freedom for tailoring light-matter interaction,which might shed new light on functional meta-optics.

关键词： apole multipole decomposition all-dielectric nanoparticles

Resonant enhancement of second harmonic generation in etchless thin film lithium niobate heteronanostructure

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2022年第10期65卷 75-82页

作者： Zhijin Huang Kaiwen Luo Ziwei Feng Zhanyuan Zhang Yang li Wentao Qiu Heyuan Guan Yi Xu xiangping li Huihui Lu Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Department of Optoelectronic EngineeringJinan UniversityGuangzhou 510632China Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou 510632China Guangdong Provincial Key Laboratory of Information Photonics Technology Institute of Advanced Photonics TechnologySchool of Information EngineeringGuangdong University of TechnologyGuangzhou 510006China

lithium niobate has received interest in nonlinear frequency conversion due to its wide transparency window,from ultraviolet to mid-infrared spectral regions,and large second-order nonlinear ***,its nanostructure is generally difficult to etch,resulting in low-Q resonance and lossy nanostructures for second harmonic *** applying the concept of bound states in the continuum,we performed theoretical and experimental investigations on high-Q resonant etchless thin-film lithium niobate with Si O_(2) nanostructures on top for highly efficient second harmonic *** the fabricated nanostructured devices,a resonance with a Q factor of 980 leads to the strong enhancement of second harmonic generation by over 1500 times compared with that in unpatterned lithium niobate thin *** the pump slightly deviates from central resonance,an absolute conversion efficiency of 6.87×10^(-7) can be achieved with the fundamental pump peak intensity of 44.65 MW/cm^(2),thus contributing to the normalized conversion efficiency of 1.54×10^(-5)cm^(2)/*** work establishes an etchless lithium niobate device for various applications,such as integrated nonlinear nanophotonics,terahertz frequency generation,and quantum information processing.

关键词： second harmonic generation etchless thin-film lithium niobate heteronanostructure high-Q resonance

同方期刊数据库

Dual-shot dynamics and ultimate frequency of all-optical magnetic recording on GdFeCo

在线全文

学校读者我要写书评

暂无评论

light(Science & Applications) 2021年第1期10卷 98-105页

作者： Sicong Wang Chen Wei\Yuanhua Feng Hongkun Cao Wenzhe li Yaoyu Cao Bai-Ou Guan Arata Tsukamoto Andrei Kirilyuk Alexey VKimel xiangping li Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou 510632China Institute for Molecules and Materials Radboud UniversityHeyendaalseweg 1356525 AJ NijmegenThe Netherlands Department of Electronic Engineering College of Information Science and TechnologyJinan UniversityGuangzhou 510632China Institute of New Energy Technology Department of Electronic EngineeringCollege of Information Science and TechnologyJinan UniversityGuangzhou 510632China College of Science and Technology Nihon University7-24-1 FunabashiChiba 274-8501Japan FEliX Laboratory Radboud UniversityToernooiveld 76525 ED NijmegenThe Netherlands

Although photonics presents the fastest and most energy-efficient method of data transfer,magnetism still offers the cheapest and most natural way to store *** ultrafast and energy-efficient optical control of magnetism is presently a missing technological link that prevents us from reaching the next evolution in information *** discovery of all-optical magnetization reversal in GdFeCo with the help of 100fs laser pulses has further aroused intense interest in this compelling *** the applicability of this approach to high-speed data processing depends vitally on the maximum repetition rate of the switching,the latter remains virtually *** we experimentally unveil the ultimate frequency of repetitive all-optical magnetization reversal through time-resolved studies of the dual-shot magnetization dynamics in Gd27 Fe63.87 *** the intensities of the shots and the shotto-shot separation,we reveal the conditions for ultrafast writing and the fastest possible restoration of magnetic *** is shown that although magnetic writing launched by the first shot is completed after 100 ps,a reliable rewriting of the bit by the second shot requires separating the shots by at least 300 *** two shots partially overlapping in space and minimally separated by 300 ps,we demonstrate an approach for GHz magnetic writing that can be scaled down to sizes below the diffraction limit.

关键词： magnetic dynamics recording

Effects of Bi^(3+) on down-/up-conversion luminescence,temperature sensing and optical transition properties of Bi^(3+)/Er^(3+)co-doped YNbO_(4) phosphors

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 Rare Earths 2022年第3期40卷 381-389,I0001页

作者： Xin Wang xiangping li Hongquan Yu Sai Xu Jiashi Sun lihong Cheng Xizhen Zhang Jinsu Zhang Yongze Cao Baojiu Chen School of Science Dalian Maritime UniversityDalian 116026China

A series of YNbO_(4):Bi^(3+) and YNbO_(4):Bi^(3+)/Er^(3+) phosphors were prepared by a conventional high temperature solid-state reaction *** results of XRD and Rietveld refinement confirm that monoclinic phase YNbO_(4)samples are *** down-/up-conversion luminescence of Er^(3+) ions was investigated under the excitation of ultraviolet light(327 nm)and near infrared light(980 nm).Under 327 nm excitation,broad visible emission band from Bi^(3+) ions and characteristic green emission peaks from Er^(3+) ions are simultaneously observed,while only strong green emissions from Er^(3+) ions are detected upon excitation of 980 *** emission enhancement is observed in down-/up-conversion luminescence processes by introducing Bi^(3+) ions into Er^(3+)-doped YNbO_(4)*** current versus up-conversion emission intensity study shows that two-photon processes are responsible for both the green and the red up-conversion emissions of Er^(3+)*** the study of the temperature sensing property of Er^(3+) ion,it is affirmed that the temperature sensitivity is sensitive to the doping concentration of Bi^(3+) *** comparing the experimental values of the radiative transition rate ratio of the two green emission levels of Er^(3+) ions and the theoretical values calculated by Judd-Ofelt(J-O)theory,it is concluded that the temperature sensing property of Er^(3+) ions is greatly affected by the energy level splitting.

关键词： YNbO_(4):Bi^(3+)/Er^(3+) Down-conversion luminescence Up-conversion luminescence Temperature sensing Rare earths

Arbitrary polarization conversion dichroism metasurfaces for all-in-one full Poincare sphere polarizers

在线全文

学校读者我要写书评

暂无评论

light(Science & Applications) 2021年第2期10卷 208-216页

作者： Shuai Wang Zi-Lan Deng Yujie Wang Qingbin Zhou Xiaolei Wang Yaoyu Cao Bai-Ou Guan Shumin Xiao xiangping li Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan University510632 GuangzhouChina Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Harbin Institute of Technology518055 ShenzhenChina Institute of Modern Optics Nankai University300350 TianjinChina

The control of polarization,an essential property of light,is of broad scientific and technological *** are indispensable optical elements for direct polarization ***,arbitrary polarization generation,except that of common linear and circular polarization,relies heavily on bulky optical components such as cascading linear polarizers and ***,we present an effective strategy for designing all-in-one full Poincare sphere polarizers based on perfect arbitrary polarization conversion dichroism and implement it in a monolayer all-dielectric *** strategy allows preferential transmission and conversion of one polarization state located at an arbitrary position on the Poincare sphere to its handedness-flipped state while completely blocking its orthogonal *** contrast to previous methods that were limited to only linear or circular polarization,our method manifests perfect dichroism of nearly 100%in theory and greater than 90%experimentally for arbitrary polarization *** leveraging this attractive dichroism,our demonstration of the generation of polarization beams located at an arbitrary position on a Poincare sphere directly from unpolarized light can substantially extend the scope of meta-optics and dramatically promote state-of-the-art nanophotonic devices.

关键词： surface. Poincare arbitrary