检索结果-南通市图书馆

Robust measurement of orbital angular momentum of a partially coherent vortex beam under amplitude and phase perturbations

引用

Opto-Electronic Science 2024年第1期3卷 1-12页

作者： Zhao Zhang Gaoyuan Li Yonglei Liu Haiyun Wang Bernhard J.Hoenders Chunhao Liang Yangjian Cai Jun Zeng Shandong Provincial engineering and Technical center of Light Manipulations&Shandong Provincial Key Laboratory of Optics and Photonic Device School of Physics and ElectronicsShandong Normal UniversityJinan 250358China Collaborative Innovation center of Light Manipulation and Applications Shandong Normal UniversityJinan 250358China School of Physical Science and technology Soochow UniversitySuzhou 215006China School of Physical Science and technology Suzhou University of Science and TechnologySuzhou 215009China Zernike Institute for Advanced Materials University of GroningenNijenborgh 4NL-9747 AG GroningenThe Netherlands Joint research center of Light Manipulation Science and Photonic Integrated Chip of East China Normal University and Shandong Normal University East China Normal UniversityShanghai 200241China

The ability to overcome the negative effects,induced by obstacles and turbulent atmosphere,is a core challenge of long-distance information transmission,and it is of great significance in free-space optical *** spatial-coherence structure,that characterizes partially coherent fields,provides a new degree of freedom for carrying ***,due to the influence of the complex transmission environment,the spatial-coherence structure is severely damaged during the propagation path,which undoubtedly limits its ability to transmit ***,we realize the robust far-field orbital angular momentum(OAM)transmission and detection by modulating the spatial-coherence structure of a partially coherent vortex beam with the help of the *** cross-phase enables the OAM information,quantified by the topological charge,hidden in the spatial-coherence structure can be stably transmitted to the far field and can resist the influence of obstructions and turbulence within the communication *** is due to the self-reconstruction property of the spatial-coherence structure embedded with the *** demonstrate experimentally that the topological charge information can be recognized well by measuring the spatial-coherence structure in the far field,exhibiting a set of distinct and separated dark rings even under amplitude and phase *** findings open a door for robust optical signal transmission through the complex environment and may find application in optical communication through a turbulent atmosphere.

关键词： degree of coherence orbital angular momentum cross-phase topological charge information transmission

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Lithium-site substituted argyrodite-type Li_(6)PS_(5)I solid electrolytes with enhanced ionic conduction for all-solid-state batteries

引用

Science China(Technological Sciences) 2023年第7期66卷 2059-2068页

作者： GAO Ling XIE YuLin TONG Yan XU Miao YOU JiaLe WEI HuiPing YU XiangXiang XU SiQi ZHANG Yi CHE Yong TANG Ya SUZUKI Kota KANNO Ryoji ZHAO GuoWei College of Chemistry and Chemical engineering Huanggang Normal UniversityHuanggang 438000China State Key Laboratory of space Power-Sources technology Shanghai Institute of Space Power-SourcesShanghai 200245China shanghai Enpower technology Co. Ltd.Shanghai 201802China Beijing Enpower technology Co. Ltd.Beijing 102628China Department of Chemistry School of ScienceShanghai UniversityShanghai 200444China research center for All-Solid-State Battery Institute of Innovation ResearchTokyo Institute of TechnologyYokohama 226-8502Japan

Argyrodites,Li_(6)PS_(5)X(X=Cl,Br,I),have piqued the interest of researchers by offering promising lithium ionic conductivity for their application in all-solid-state batteries(ASSBs).However,other than Li_(6)PS_(5)Cl(651Cl)and Li_(6)PS_(5)Br(651Br),Li_(6)PS_(5)I(651I)shows poor ionic conductivity(10^(-7)S cm^(-1)at 298 K).Herein,we present Al-doped 651I with I^(-)/S^(2-)site disordering to lower activation energy(Ea)and improve ionic *** formed argyrodite-type solid solutions with a composition of(Li_(6–3x)Al_(x))PS_(5)I in 0≤x≤0.10,and structural analysis revealed that Al^(3+)is located at Li ***,the Al-doped samples contained anion I^(-)/S^(2-)site disorders in the crystal structures and smaller lattice parameters than the non-doped *** spectroscopy measurements indicated that Al-doping reduced the ionic diffusion barrier,Ea,and increased the ionic conductivity to 10^(-5)S cm^(-1);the(Li5.7Al0.1)PS5I had the highest ionic conductivity in the studied system,at 2.6×10^(-5)S cm^(-1).In a lab-scale ASSB,with(Li_(5.7)Al_(0.1))PS_(5)I functioned as a solid electrolyte,demonstrating the characteristics of a pure ionic conductor with negligible electronic *** evaluated ionic conduction is due to decreased Li+content and I^(-)/S^(2-)disorder ***-site cation doping enables an in-depth understanding of the structure and provides an additional approach to designing betterperforming SEs in the argyrodite system.

关键词： argyrodite Li6PS5I solid electrolytes ionic conductor ionic conductivity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

All-fiber-based ultrastable laser with long-term frequency stability of 1.1×10^(-14)

引用

Chinese Optics Letters 2023年第3期21卷 84-89页

作者：黄亚峰胡笛叶美凤王亚婷李彦黎李明陈胤男屈求智汪凌珂刘亮李唐 Laboratory of space Laser engineering Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China center of Materials Science and Optoelectronics engineering University of Chinese Academy of SciencesBeijing 100049China University of shanghai for Science and technology Shanghai 200093China

We demonstrate an ultrastable miniaturized transportable laser system at 1550 nm by locking it to an optical fiber delay line[FDL].To achieve optimized long-term frequency stability,the FDL was placed into a vacuum chamber with a five-layer thermal shield,and a delicate two-stage active temperature stabilization,an optical power stabilization,and an RF power stabilization were applied in the system.A fractional frequency stability of better than 3.2×10^[-15]at 1 s averaging time and1.1×10^[-14]at 1000 s averaging time was achieved,which is the best long-term frequency stability of an all-fiber-based ultrastable laser observed to date.

关键词： fiber delay line frequency stability ultrastable laser

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Numerical investigation of low cycle fatigue life for channel wall nozzles

引用

航空动力学报 2018年第7期33卷 1553-1565页

作者： CHENG Cheng WANG Yibai LIU Yu LIN Qingguo research and Development center Shanghai Institute of Space Propulsion Shanghai 201112 China shanghai engineering research center of space engine Shanghai 201112 China School of Astronautics Beijing University of Aeronautics and Astronautics

The thermal-structural response and low cycle fatigue life of a three-dimensional(3D)channel wall nozzle with regenerative cooling were numerically investigated by coupling the finite volume fluid-thermal method,nonlinear finite element thermal-structural analysis and local strain *** nozzle had a high area ratio(nozzle exit area divided by throat area)under cyclic working *** studies were carried out to evaluate the effects of channel structural parameters such as channel width,channel height,liner thickness and rib *** showed that the integrated effects of three-dimensional channel structure and load distribution caused serious strain,which mainly occurred at the intersectant regions of liner wall on the gas side and the symmetric planes of channel and *** cooling effect and channel structural strength were significantly improved as the channel width and height decreased,leading to substantial extension of the nozzle service *** the other hand,the successive decrease in liner thickness and rib width apparently increased the strain amplitude and residual strain of channel wall nozzle during cyclic work,significantly shortening the service *** present work is of value for design of the channel wall nozzle to prolong its cyclic service life.

关键词： liquid propellant rocket engine low cycle fatigue channel wall nozzle regenerative cooling nonlinear structural analysis finite element method

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Exploring Sulfur Chemistry in TMC-1 with NSRT

引用

Chinese Physics Letters 2024年第2期41卷 129-132页

作者： Wasim Iqbal Xiaohu Li Juan Tuo Ryszard Szczerba Yanan Feng Zhenzhen Miao Jiangchao Yang Jixing Ge Gleb Fedoseev Donghui Quan Qiang Chang Chuan-Lu Yang Tao Yang Gao-Lei Hou Yong Zhang Xuan Fang Xia Zhang Fangfang Li Rong Ma Xiaomin Song Zhiping Kou Yuxuan Sun Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Xinjiang Key Laboratory of Radio Astrophysics Urumqi 830011China Key Laboratory of Radio Astronomy Chinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China Nicolaus Copernicus Astronomical center Rabia´nska 887-100 Toru´nPoland research Laboratory for Astrochemistry Ural Federal UniversityKuibysheva St.48620026 EkaterinburgRussia Astronomical Computing research center Zhejiang LaboratoryHangzhou 311100China School of Physics and Optoelectronic engineering Shandong University of TechnologyZibo 255000China School of Physics and Optoelectronic engineering Ludong UniversityYantai 264025China State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter School of PhysicsXi’an Jiaotong UniversityXi’an 710049China School of Physics and Astronomy Sun Yat-sen UniversityGuangzhou 510275China Laboratory for space research Faculty of ScienceThe University of Hong KongHong KongChina National Astronomical Observatories Chinese Academy of SciencesBeijing 100012China

There have been several studies on sulfur depletion in dense cores like TMC-1(Taurus Molecular Cloud 1),employing updated reaction networks for sulfur species to explain the missing sulfur in the gas within dense *** of these studies used a C/O ratio of 0.7 or *** present NSRT(NanShan 26m Radio Telescope)observations of TMC-1 alongside results from time-dependent chemical simulations using an updated chemical *** findings highlight the impact of the C/O ratio on the gas-phase evolution of C2S and *** simulation results show that the C/O ratio is an important parameter,playing a fundamental role in determining the gas-phase abundances of sulfur species in dense cores.

关键词： sulfur Sulfur depletion

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Frictional resistance of supercritical pressure RP-3 flowing in a vertically downward tube at constant heat fluxes

引用

Chinese Journal of Aeronautics 2022年第9期35卷 117-128页

作者： Yinlong LIU Guoqiang XU Yanchen FU Jie WEN Geng GONG Lulu LYU research Institute of Aero-engine Beihang UniversityBeijing 100191China National Key Laboratory of Science and technology on Aero-engine Aero-thermodynamics Beihang UniversityBeijing 100191China School of Energy and Power engineering Beihang UniversityBeijing 100191China Beihang Hangzhou Innovation Institute Yuhang Hangzhou 310023China China Aerodynamics research and Development center Mianyang 621000China AECC Commercial Aircraft engine Co. Ltd.Shanghai 200241China

Based on the demands of compact heat exchangers and micro cooling channels applied for aviation thermal protection, the flow resistance characteristics of aviation kerosene RP-3 were experimentally studied in a vertically downward circular miniature tube with an inner diameter of 1.86 mm at supercritical pressures and constant heat fluxes. A long and short tube method was used to accurately calculate the frictional pressure drop, and experimental conditions are supercritical pressures of 4 MPa, mass flow rates of 2–4 g/s(i.e., mass fluxes of 736–1472 kg/(m^(2)·s)), heat fluxes of 100–500 kW/m^(2), and inlet temperatures of 373–673 K. Results show that the sharp variations of thermophysical properties, especially density, have significant influences on frictional ***, the frictional pressure drop and the friction factor increase with increasing inlet temperatures, and this trend speeds up in the relatively high-temperature region. However, the friction factor has a sudden decline when the fuel outlet temperature exceeds the pseudo-critical *** frictional pressure drop and the friction factor basically remain unchanged with increasing heat flux when the inlet temperature is relatively low, but increase quickly when the inlet temperature is relatively high. Besides, a larger mass flux yields a higher pressure drop but does not necessarily yield a higher friction factor. Finally, an empirical friction factor correlation is proposed and shows better predictive performance than those of previous models.

关键词： Aviation kerosene RP-3 Constant heat flux Empirical correlation Friction factor Supercritical pressure Vertical tube

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Facile fabrication of CeO_2 hollow microspheres with yeast as bio-templates

引用

Journal of Rare Earths 2015年第12期33卷 1329-1334页

作者：牟广宇魏清莲黄永民 Key Laboratory of Specially Functional Polymeric Materials and Related technology Ministry of Education Department of Chemistry East China University of Science and technology shanghai engineering research center of space engine shanghai Institute of space Propulsion

CeO2 hollow microspheres were prepared through a facile method by using yeast cells as bio-templates. The yeast pro- vided a solid flame for the deposition of cerium hydroxide to form the hybrid Ce（OH）3@yeast precursor. The resulting CeO2 hollow microspheres were obtained by calcining the precursor. The products were characterized by field emission scanning electron micros- copy （FE-SEM）, transmission electron microscopy （TEM）, X-ray powder diffraction （XRD）, fourier transform infrared spectroscopy （FTIR）, N2 adsorption/desorption analysis, X-ray photoelectron spectrum （XPS） and H2 temperature programmed reduction （H2-TPR） It was found that the products fully retained the morphology of the yeast cells and the size of the hollow microspheres was about 1.5-2 μm. The catalytic test results showed that the as-obtained hollow CeO2 microspheres possessed a higher catalytic activity in CO oxidation than the commercial CeO2, which attributed to their higher surface area, hollow structure and superior reducibility. This study provided a promising route for the preparation of a variety of other inorganic hollow microspheres.

关键词： bio-template CeO2 hollow spheres CO oxidation rare earths

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Subspace Identification for Closed-Loop Systems With Unknown Deterministic Disturbances

引用

IEEE/CAA Journal of Automatica Sinica 2023年第12期10卷 2248-2257页

作者： Kuan Li Hao Luo Yuchen Jiang Dejia Tang Hongyan Yang IEEE shanghai Aerospace Control technology Institute Shanghai 201109China the Control and Simulation center School of AstronauticsHarbin Institute of TechnologyHarbin 150006China the Faculty of Information technology Engineering Research Center of Digital CommunityMinistry of EducationBeijing University of TechnologyBeijing 100124China

This paper presents a subspace identification method for closed-loop systems with unknown deterministic *** deal with the unknown deterministic disturbances,two strategies are implemented to construct the row space that can be used to approximately represent the unknown deterministic disturbances using the trigonometric functions or Bernstein polynomials depending on whether the disturbance frequencies are *** closed-loop identification,CCF-N4SID is extended to the case with unknown deterministic disturbances using the oblique *** addition,a proper Bernstein polynomial order can be determined using the Akaike information criterion(AIC)or the Bayesian information criterion(BIC).Numerical simulation results demonstrate the effectiveness of the proposed identification method for both periodic and aperiodic deterministic disturbances.

关键词： Bernstein polynomial closed-loop system subspace identification unknown deterministic disturbances

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Increasing ionic conductivity in Li_(0.33)La_(0.56)TiO_(3)thin-films via optimization of processing atmosphere and temperature

引用

Rare Metals 2022年第1期41卷 179-188页

作者： Shi-Pai Song Cheng Yang Chun-Zhi Jiang Yong-Min Wu Rui Guo He Sun Jing-Lei Yang Yong Xiang Xiao-Kun Zhang School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China School of Materials Science and engineering Harbin Institute of TechnologyHarbin 150001China State Key Laboratory of space Power-Sources technology Shanghai Institute of Space Power-SourcesShanghai 200245China Department of Mechanical and Aerospace engineering Hong Kong University of Science and TechnologyHong Kong 999077China Advanced Energy research Institute University of Electronic Science and Technology of ChinaChengdu 611731China Sichuan Provincial engineering research center of Flexible Display Material Genome University of Electronic Science and Technology of ChinaChengdu 611731China

As a promising solid electrolyte for thin-film lithium batteries,the amorphous Li_(0.33)La_(0.56)TiO_(3)(LLTO)thin film has gained great ***,enhancing ionic conductivity remains challenging in the ***,a systematical study was performed to improve the ionic conductivity of sputter-deposited LLTO thin films via the optimization of processing atmosphere and *** combining the optimized oxygen partial pressure(30%),annealing temperature(300℃),and annealing atmosphere(air),an amorphous LLTO thin film with an ionic conductivity of 5.32910^(-5)·S·cm^(-1) at room temperature and activation energy of 0.26 eV was *** results showed that,first,the oxygen partial pressure should be high enough to compensate for the oxygen loss,but low enough to avoid the abusive oxygen scattering effect on lithium precursors that results in a lithium-poor *** oxygen partial pressure needs to achieve a balance between lithium loss and oxygen defects to improve the ionic ***,a proper annealing temperature reduces the oxygen defects of LLTO thin films while maintaining its amorphous state,which improves the ionic ***,the highest ionic conductivity for the LLTO thin films that were annealed in air(a static space without a gas stream)occurs because of the decreased lithium loss and oxygen defects during *** findings show that the lithium-ion concentration and oxygen defects affect the ionic conductivity for amorphous LLTO thin films,which provides insight into the optimization of LLTO thin-film solid electrolytes,and generates new opportunities for their application in thinfilm lithium batteries.

关键词： Li_(0.33)La_(0.56)TiO_(3) Thin film Ionic conductivity Lithium-ion concentration Oxygen defects

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Data quantity governance for machine learning in materials science

引用

National Science Review 2023年第7期10卷 234-250页

作者： Yue Liu Zhengwei Yang Xinxin Zou Shuchang Ma Dahui Liu Maxim Avdeev Siqi Shi School of Computer engineering and Science Shanghai University shanghai engineering research center of Intelligent Computing System Australian Nuclear Science and technology Organisation School of Chemistry The University of Sydney State Key Laboratory of Advanced Special Steel School of Materials Science and Engineering Shanghai University Materials Genome Institute Shanghai University

Data-driven machine learning(ML) is widely employed in the analysis of materials structure-activity relationships,performance optimization and materials design due to its superior ability to reveal latent data patterns and make accurate ***,because of the laborious process of materials data acquisition,ML models encounter the issue of the mismatch between a high dimension of feature space and a small sample size(for traditional ML models) or the mismatch between model parameters and sample size(for deep-learning models),usually resulting in terrible ***,we review the efforts for tackling this issue via feature reduction,sample augmentation and specific ML approaches,and show that the balance between the number of samples and features or model parameters should attract great attention during data quantity *** this,we propose a synergistic data quantity governance flow with the incorporation of materials domain *** summarizing the approaches to incorporating materials domain knowledge into the process of ML,we provide examples of incorporating domain knowledge into governance schemes to demonstrate the advantages of the approach and *** work paves the way for obtaining the required high-quality data to accelerate materials design and discovery based on ML.

关键词： machine learning data governance data quantity materials science

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：