检索结果-南通市图书馆

Influence of Sb on the Scintillation Properties of Lead Tungstate Crystal

维普期刊数据库博看期刊

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

Chinese Physics Letters 1999年第10期16卷 761-763页

作者： liu xian-cai HU Guan-qin FENG Xi-qi LI Pei-jun ZHANG Ming-rong XU Li YIN Zhi-wen Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 200050

Sb-doped lead tungstate(PWO)crystals were grown and *** measurements of Sb content in crystals indicated that the segregation coefficient of Sb in PWO is about *** with a little Sb^(3+)introduced into PWO crystal,the transmission,especially the light yield was enhanced ***,after the Sb-doped PWO crystals were annealed,not only the fast component still remained a high percentage but also the radiation hardness was improved *** main reason may be that Sb-doping can compensate the composition deficiency and then reduce the density of hole centers such as Pb^(3+)and O^(-).

关键词： centers doping annealed

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

江汉平原区小流域综合治理体系构建研究

陕西林业科技 2024年第5期52卷 102-109页

作者：陈芳张少佳刘贤才张亮霞夏可添高阳李永红湖北省水利水电规划勘测设计院有限公司湖北武汉430000 中国南水北调集团江汉水网建设开发有限公司湖北武汉430000 湖北省洪湖市水利和湖泊局湖北洪湖433200 西北农林科技大学水土保持科学与工程学院陕西杨凌712100

流域综合治理是生态文明建设的关键领域之一,而小流域作为治理体系的微观基础,承担着至关重要的功能。本文旨在探讨小流域管理的最新进展,并分析当前平原地区小流域治理所面临的挑战与不足。为了深入探索新时代平原区小流域综合管理的... 详细信息

流域综合治理是生态文明建设的关键领域之一,而小流域作为治理体系的微观基础,承担着至关重要的功能。本文旨在探讨小流域管理的最新进展,并分析当前平原地区小流域治理所面临的挑战与不足。为了深入探索新时代平原区小流域综合管理的策略与模式,本研究以洪湖市双电河小流域为案例,提出了一种创新的三生空间格局划分方法,包括“农田鱼塘生产治理区、人居环境生活治理区、河湖沟渠生态治理区”。这一模式强调了政府与市场之间的协同合作,以及多个部门的协调一致,利用现有项目资源,共同推进“治湖清水、治河疏水、治污洁水、依水塑村、以水兴业”的五水共建策略,并以此作为典型示范,引领其他区域的治理工作。通过这种系统化的治理方法,不仅能够实现源头控制和系统化管理,还能促进乡村的全面繁荣,打造出富饶美丽的乡村景观。本研究的成果,有望为平原区小流域的综合治理提供一套可复制、可推广的参考模型,为生态文明建设贡献理论与实践的双重价值。本研究提出的治理模式和管理策略,将为平原区小流域的综合治理提供科学、系统的方法论支持,为建设美丽中国贡献智慧与力量。

关键词：小流域综合治理生态清洁小流域农业面源污染美丽中国江汉平原

Upgrading waste NO_(x) into amino acids via electrocatalysis on Co nanoparticles encapsulated in hollow carbon nanofibers

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

Science China Chemistry 2024年第6期67卷 1946-1952页

作者： Jiahui xian Kaixing cai Peisen Liao Shihan Wang Guangqin Li Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education LIFMIGCMESchool of ChemistrySun Yat-Sen UniversityGuangzhou510275China

Electrocatalytic conversion of waste nitrogen oxide(NO_(x))into value-added nitrogenous chemicals,especially amino acid,is an emerging strategy to alleviate NO_(x)***,this process suffers from the coexistence of multiple competitive reactions leading to complex product distribution and low efficiency,and thus the rational design and modulation of efficient catalysts remains a formidable ***,well-designed Co nanoparticles encapsulated in hollow carbon nanofiber(CoHCNF)were constructed to promote the amino acid electrosynthesis via dealing waste NO_(x)coupling with biomass-derived keto *** to the rapid reactant diffusion,electron transport and efficient contact with abundant accessible Co catalytic sites stemmed from the unique hollow nanotubular structure,Co-HCNF manifested impressive glycine synthesis performance in one-pot adopting NO as the nitrogen source with Faradaic efficiency(FE)of 41.7%and a corresponding yield rate of 222.3μmol h^(-1)as well as 120 h robust ***,it also demonstrates an excellent performance with the FE of 42.8%for NO_(3)~-solution as the nitrogen ***,this strategy displays a broad universality for the synthesis of other amino *** work not only highlights the importance of hollow-structuring electrocatalyst towards upgrading wasted NO_(x)species into amino acids,but also promotes the further development of electrosynthetic systems for high-valued N-containing organic chemicals.

关键词： electrocatalysis NO_(x)reduction amino acid porous materials hollow structure

Review of dynamics and active control of large-scale space membrane antenna

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

Astrodynamics 2024年第1期8卷 1-26页

作者： xiang liu Guoping cai Department of Engineering Mechanics MOE Key Laboratory of HydrodynamicsChongqing Research InstituteShanghai Jiao Tong UniversityShanghai200240China

Large-scale space membrane antennas have significant potential in satellite communication,space-based early warning,and Earth *** of their large size and high flexibility,the dynamic analysis and control of membrane antenna are *** maintain the working performance of the antenna,the pointing and surface accuracies must be strictly ***,the accurate dynamic modeling and effective active control of large-scale space membrane antennas have great theoretical significance and practical value,and have attracted considerable interest in recent *** paper reviews the dynamics and active control of large-scale space membrane ***,the development and status of large-scale space membrane antennas are ***,the key problems in the dynamics and active control of large membrane antennas,including the dynamics of wrinkled membranes,large-amplitude nonlinear vibration,nonlinear model reduction,rigid-flexible-thermal coupling dynamic modeling,on-orbit modal parameter identification,active vibration control,and wave-based vibration control,are discussed in ***,the research outlook and future trends are presented.

关键词： large-scale space membrane antenna dynamicmodeling active control

Hyperspectral image super resolution using deep internal and self-supervised learning

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CAAI Transactions on Intelligence Technology 2024年第1期9卷 128-141页

作者： Zhe liu xian-Hua Han Graduate School of Science and Technology for Innovation Yamaguchi UniversityYamaguchiJapan Graduate School of Artificial Intelligence and Science Rikkyo UniversityTokyoJapan

By automatically learning the priors embedded in images with powerful modelling ca-pabilities,deep learning-based algorithms have recently made considerable progress in reconstructing the high-resolution hyperspectral(HR-HS)*** previously collected large-amount of external data,these methods are intuitively realised under the full supervision of the ground-truth ***,the database construction in merging the low-resolution(LR)HS(LR-HS)and HR multispectral(MS)or RGB image research paradigm,commonly named as HSI SR,requires collecting corresponding training triplets:HR-MS(RGB),LR-HS and HR-HS image simultaneously,and often faces dif-ficulties in *** learned models with the training datasets collected simultaneously under controlled conditions may significantly degrade the HSI super-resolved perfor-mance to the real images captured under diverse *** handle the above-mentioned limitations,the authors propose to leverage the deep internal and self-supervised learning to solve the HSI SR *** authors advocate that it is possible to train a specific CNN model at test time,called as deep internal learning(DIL),by on-line preparing the training triplet samples from the observed LR-HS/HR-MS(or RGB)images and the down-sampled LR-HS ***,the number of the training triplets extracted solely from the transformed data of the observation itself is extremely few particularly for the HSI SR tasks with large spatial upscale factors,which would result in limited reconstruction *** solve this problem,the authors further exploit deep self-supervised learning(DSL)by considering the observations as the unlabelled training ***,the degradation modules inside the network were elaborated to realise the spatial and spectral down-sampling procedures for transforming the generated HR-HS estimation to the high-resolution RGB/LR-HS approximation,and then the reconstruction errors of the observations were formulated for mea

关键词： computer vision deep learning deep neural networks hyperspectral image enhancement

Novel method for measuring surface residual stress using flat-ended cylindrical indentation

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8期37卷 486-495页

作者： Guangzhao HAN Lixun cai Xiaokun liu Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and Aerospace EngineeringSouthwest Jiaotong UniversityChengdu 610031China Zhengzhou Machinery Research Institute Transmission Technology Co. LtdZhengzhou 518115China

Instrumented indentation is a promising technique for estimating surface residual stresses and mechanical properties in engineering *** relative difference between the indentation loads for unstressed and stressed specimens was selected as the key parameter for measuring surface residual stresses in flat-ended cylindrical *** on the equivalent material method and finite element simulations,a dimensionless mapping model with six constants was established between the relative load difference,constitutive model parameters,and normalized residual stress.A novel method for measuring the surface residual stress and constitutive model parameters of metallic material through flat-ended cylindrical indentations was proposed using this model and a mechanical properties determination *** simulations were conducted using numerous elastoplastic materials with different residual stresses to verify the proposed model;good agreements were observed between the predicted residual stresses and those previously applied in finite element ***-ended cylindrical indentation tests were performed on four metallic materials using cruciform specimens subjected to various equibiaxial *** results exhibited good conformance between the stress–strain curves obtained using the proposed method and those from traditional tensile tests,and the absolute differences between the predicted residual stresses and applied stresses were within 40 MPa in most cases.

关键词： Instrumented indentation Residual stress Finite element simulation Equivalent material method Mechanical property

Polarized imaging dynamic light scattering for simultaneous measurement of nanoparticle size and morphology

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 2024年第2期85卷 213-223页

作者： Bingyao Wang Tianyi cai Xiaoshu cai Wu Zhou Zeqi liu Schoolof Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai200093China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai200093China Jiaxing MeaParTech Instrument Technology Co. LtdZhejiang314000China

The performance of nanoparticles is often affected by particle size and ***,electron microscopy or atomic force microscopy is typically utilized to determine the size and morphology of ***,there are issues such as difficult sample preparation,long processing times,and challenges in quantitative ***,it is of great significance to develop a fast,accu-rate,and statistical method to measure the size and morphology of *** this study,a new method,called polarized imaging dynamic light scattering(PIDLS),is *** nanoparticles are irradiated with a vertical linearly polarized laser beam,and a polarization camera collected the dynamic light scattering images of particles at four different polarization directions(0°,45°,90°,and 135°)at a scattering angle of 90°.The average particle size and distribution are obtained using the imaging dy-namic light scattering method at 0°polarization direction,and the morphology of the particles is ob-tained based on the depolarization patterns of the scattered *** optical sphericityΦis defined based on the degree of linear polarization(DoLP).It is also implemented for the quantitative evaluation of the sphericity of the nanoparticles,including spherical,octahedral,nanoplate,nanorod,and linear *** with the Poincarésphere parameterψ,the morphology of the nanoparticles can be roughly *** addition,PIDLS enables the measurement of particle size and morphology distributions simultaneously for evaluating the uniformity of *** effectiveness of PIDLS is verified by the measurement of five kinds of industrial titanium dioxide as well.

关键词： Imaging dynamic light scattering Polarized light scattering Non-spherical nanoparticles Morphology Online measurement

Evaluation of transmission risk of respiratory particles under different ventilation strategies in an elevator

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Building Simulation 2024年第5期17卷 771-784页

作者： Liangyu Zhu xian Li Bujin Feng Fan liu School of Civil Engineering and Architecture Linyi UniversityLinyi276000China College of Agriculture Shandong Agricultural UniversityTaian271018China School of Environment and Architecture University of Shanghai for Science and TechnologyShanghai200093China

People in elevators are at risk of respiratory infection because the elevator cabin is crowded and has poor *** exhaled particles may be inhaled by the susceptible person,deposited on the surface and suspended in the elevator,which can result in direct and indirect ***,whether the air vent designs adopted in the elevator can effectively reduce the transmission risk of respiratory particles remains *** this study,the dispersion of particles under four common ventilation strategies used in the commercial elevator was investigated by proven computational fluid dynamics(CFD)*** flow field was simulated with the RNG κ-ξ turbulence model and the Lagrangian method was adopted to track particle *** effects of air vent layout and airflow rate on particle transmission were *** found that more than 50% of exhaled particles(average value)were suspended in the cabin and difficult to discharge under the investigated ventilation *** deposited fraction of particles on the susceptible person reached up to 39.14% for infiltration ventilation,which led to a high risk of contact *** the ventilation rate could not significantly reduce the inhalation proportion of particles due to the poor airflow distribution inside the elevator.A more proper ventilation strategy should be explored for the elevator to control transmission risk.

关键词： particle dispersion transmission risk elevator ventilation strategy computational fluid dynamics(CFD)

Comprehensive analysis of clinical and biological value of ING family genes in liver cancer

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 Oncology 2024年第6期16卷 2592-2609页

作者： Shi-cai liu School of Medical Information Wannan Medical CollegeWuhu 241002Anhui ProvinceChina

BACKGROUND Liver cancer(LIHC)is a malignant tumor that occurs in the liver and has a high mortality in *** ING family genes were identified as tumor suppressor *** expression of these genes can lead to cell cycle arrest,senescence and/or *** family genes are promising targets for anticancer ***,their role in LIHC is still not well *** To have a better understanding of the important roles of ING family members in *** A series of bioinformatics approaches(including gene expression analysis,genetic alteration analysis,survival analysis,immune infiltration analysis,prediction of upstream microRNAs(miRNAs)and long noncoding RNAs(lncRNAs)of ING1,and ING1-related gene functional enrichment analysis)was applied to study the expression profile,clinical relationship,prognostic significance and immune infiltration of ING in *** relationship between ING family genes expression and tumor associated immune checkpoints was investigated in *** molecular mechanism of ING1 mediated hepatocarcinogenesis was preliminarily *** mRNA/protein expression of different ING family genes in LIHC was analyzed in different databases,showing that ING family genes were highly expressed in *** 47 samples from 366 LIHC patients,the ING family genes were altered at a rate of 13%.By comprehensively analyzing the expression,clinical pathological parameters and prognostic value of ING family genes,ING1/5 was ***1/5 was related to poor prognosis of LIHC,suggesting that they may play key roles in LIHC tumorigenesis and *** of the target miRNAs of ING1 was identified as *** upstream lncRNAs of hsa-miR-214-3p,U91328.1,and HCG17,were *** the same time,we found that the expression of ING family genes was correlated with immune cell infiltration and immune checkpoint *** This study lays a foundation for further research on the potential mechanism and clinical v

关键词： Liver cancer ING family genes Noncoding RNAs Immune cell infiltration Prognosis