检索结果-南通市图书馆

Polyoxovanadate-based metal-organic frameworks consisted of open vanadium sites for selective catalytic oxidation of sulfides

引用

Tungsten 2023年第2期5卷 261-269页

作者： Jin-Lin Zhang qi-Xin zhao meng-Yuan Cheng Wei-Min Xuan Yan Liu College of Chemistry and Chemical Engineering and State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua UniversityShanghai201620China School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai 200240China

Three novel polyoxovanadate-based metal-organic frameworks(POV-MOFs),[Co_(2)(1,4-dtzb)_(3)]{V_(4)O_(12)}(V-Co-MOF_(1),1,4-dtzb=1,4-di(4H-1,2,4-triazol-4-yl)benzene],[Co_(3)(1,3-dtzb)_(2)][{V_(6)O_(18)}(V-Co-MOF_(2),1,3-dtzb=1,3-di(4H-1,2,4-triazol-4-yl)benzene],[Co_(4)(4,4’-bdtzb)_(2)]{V_(8)O_(24)}(V-Co-MOF_(3),4,4’-bdtzb=4,4’-(1,1’-biphenyl)-4,4’-diylbis(4H-1,2,4-triazole)benzene]were facilely synthesized and structurally ***-crystal X-ray diffraction analysis indicates that all the POV-MOFs possess open V sites lined on POV clusters of{V_(4)O_(12)}/{V_(6)O_(18)}/{V_(8)O_(24)}that uniformly distribute on the robust three-dimensional *** unique structural feature allows them to show high performance for sulfidesulfoxide transformation when performing the reaction in MeOH at 50℃ for 45 min using H_(2)O_(2) as green ***,V-Co-MOF1 exhibited the highest catalytic efficiency,with a conversion>99% and selectivity up to 97% for a series of sulfide *** reaction demonstrated the catalytically active centers are the open V sites while the MOF skeleton constructed from Co^(2+)and ligands also contributes to enhance the conversion and selectivity via synergistic ***,V-Co-MOF1 can be used as a stable heterogeneous catalyst,and both the structural integrity and catalytic performance were well reserved after five cycles,demonstrating their great potential for advanced catalytic oxidation.

关键词： Polyoxovanadates Polyoxometalate-based metal-organic framework Sulfoxide Catalytic oxidation

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

Transfer force perception skills to robot‐assisted laminectomy via imitation learning from human demonstrations

引用

CAAI Transactions on Intelligence Technology 2024年第4期9卷 903-916页

作者： meng Li Xiaozhi qi Xiaoguang Han Ying Hu Bing Li Yu zhao Jianwei Zhang Harbin Institute of Technology ShenzhenChina Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhenChina Shenzhen Key Laboratory of Minimally Invasive Surgical Robotics and System Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhenChina Beijing Jishuitan Hospital Capital Medical UniversityBeijingChina Department of Orthopedics Peking Union Medical College HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijingChina University of Hamburg Hamburg22527Germany

A comparative study of two force perception skill learning approaches for robot‐assisted spinal surgery,the impedance model method and the imitation learning(IL)method,is *** impedance model method develops separate models for the surgeon and patient,incorporating spring‐damper and bone‐grinding *** surgeons'feature parameters are collected and mapped using support vector regression and image navi-gation *** imitation learning approach utilises long short‐term memory networks(LSTM)and addresses accurate data labelling challenges with custom *** results demonstrate skill recognition rates of 63.61%-74.62%for the impedance model approach,relying on manual feature ***,the imitation learning approach achieves a force perception recognition rate of 91.06%,outperforming the impedance model on curved bone *** findings demonstrate the potential of imitation learning to enhance skill acquisition in robot‐assisted spinal surgery by eliminating the laborious process of manual feature extraction.

关键词： learning(artificial intelligence) medical applications medical signal processing robotics

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Unilateral lichen planus with Blaschko line distribution: A case report

引用

World Journal of Clinical Cases 2022年第24期10卷 8679-8685页

作者： Shuai Dong Wen-Jing Zhu meng Xu Xue-qi zhao Yan Mou Department of Dermatology The Second Hospital of Jilin UniversityChangchun 130041Jilin ProvinceChina

BACKGROUND Lichen planus(LP)with distribution of lesions along Blaschko’s lines is a rare entity,accounting for 0.24%-0.62%of all *** distribution of lesions in arm,leg,trunk,and waist is even less *** 10%of patients with LP manifest nail *** SUMMARY A 20-year-old woman presented to our department with polygonal,purpuric,flattopped papules over the right arm,right leg,and right side of trunk and waist for the last 5 *** patient initially developed nail deformation in the left middle finger with no obvious cause,followed by development of blue-purple and red maculopapular rash with *** the disease course,the skin lesions aggravated and spread to several segments due to *** lesions showed unilateral distribution along the Blaschko’s *** diagnosis of LP along Blaschko’s lines was established based on dermoscopy and skin *** cutaneous lesions considerably improved after 4-wk treatment with intramuscular glucocorticoid,oral acitretin,topical glucocorticoid,and *** Cases of LP involving multiple segments of the body along the Blaschko’s lines with nail damage are rare.

关键词： Lichen planus Blaschko’lines Lichen planus involving nails Case report

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Synthesis of Cu/ZnO Flower-like Hierarchical Porous Structures and Investigation of Their Catalytic Performance for Dimethyl Oxalate Hydrogenation

引用

China Petroleum Processing & Petrochemical Technology 2017年第2期19卷 40-47页

作者： San Xiaoguang zhao Guodong Wang Guosheng qi Jian Jin Quan meng Dan College of Chemical Engineering Shenyang University of Chemical Technology State Key Laboratory of Biochemical Engineering CAS Center for Excellence in Nanoscience Institute of Process Engineering Chinese Academy of Sciences

The Cu/ZnO flower-like hierarchical porous structures were successfully synthesized via the cetyltrimethyl ammonium bromide(CTAB) assisted hydrothermal method. The morphology and structure as well as the catalytic performance for dimethyl oxalate(DMO) hydrogenation to ethylene glycol(EG) were investigated. Through annealing the zinc copper hydroxide carbonate(ZCHC) precursors, the Cu/ZnO flower-like hierarchical porous structures were obtained, which were assembled by a number of porous nanosheets. The catalyst made of these well-defined flower-like hierarchical porous structures with large specific surface area and effective gas diffusion path via the well-aligned porous structures showed higher EG selectivity and yield as compared to the Cu/ZnO catalyst obtained by conventional co-precipitation technique. The results indicated that the Cu/ZnO flower-like hierarchical porous structures have excellent potential application for manufacture of high performance catalysts.

关键词： hierarchical porous structure Cu/ZnO catalyst dimethyl oxalate hydrogenation

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

Nitrogen-doped hierarchical few-layered porous carbon for efficient electrochemical energy storage

引用

Carbon Energy 2021年第2期3卷 349-359页

作者： Peng Wang Xiaohuan qi Wei zhao meng qian Hui Bi Fuqiang Huang State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghaiChina School of Physical Science and Technology ShanghaiTech UniversityShanghaiChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications College of Chemistry and Molecular EngineeringPeking UniversityBeijingChina

Large surface area,high conductivity,and rich active site of carbon electrode materials are necessary characteristics for energy storage ***,high conductivity and high nitrogen doping of carbon electrode materials are difficult to ***,a facile method via the carbonization of nitrogen-containing Schiff base polymer has been developed to prepare high conductivity and high nitrogen-doped hierarchical porous *** organic components with a benzene ring structure in the polymer promote the formation of more sp^(2)-graphitized carbon,which is beneficial for the improvement of electrical ***-doped hierarchical porous carbon calcined at 900℃ under the NH3 atmosphere possesses high nitrogen content of 7.48 at%,a large specific surface area of 1613.2m2/g,and high electrical conductivity of 2.7 S/*** electrode materials in an aqueous-based supercapacitor,nitrogen-doped hierarchical porous carbon exhibits superior specific capacitance of 385 F/g at 1 A/g as well as excellent rate performance(242 and 215 F/g at a current density of 100 and 200 A/g,respectively).In addition,the specific capacitance of electrode measured in a two-electrode system is 335 F/g at 1 A/g,and the long-term cycling stability can be achieved with more than 94%initial capacitance after 10000 *** constructed symmetric supercapacitor delivers high energy density and high power *** outstanding electrochemical performances combined with the novel and scalable synthetic approach make the nitrogen‐doped hierarchical porous carbon potential electrode material for electrochemical devices.

关键词： hierarchical porous carbon high specific surface area nitrogen-doped rate performance supercapacitor

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Gridless Variational Bayesian Inference of Line Spectral from Quantized Samples

引用

China Communications 2021年第10期18卷 77-95页

作者： Jiang Zhu qi Zhang Xiangming meng The Engineering Research Center of Oceanic Sensing Technology and Equipment Ministry of EducationZhoushan 316021China Ocean College Zhejiang UniversityZhoushan 316021China Institute for Physics of Intelligence Graduate School of ScienceThe University of Tokyo7-3-1HongoTokyo 113-0033Japan

Efficient estimation of line spectral from quantized samples is of significant importance in information theory and signal processing,e.g.,channel estimation in energy efficient massive MIMO systems and direction of arrival *** goal of this paper is to recover the line spectral as well as its corresponding parameters including the model order,frequencies and amplitudes from heavily quantized *** this end,we propose an efficient gridless Bayesian algorithm named VALSE-EP,which is a combination of the high resolution and low complexity gridless variational line spectral estimation(VALSE)and expectation propagation(EP).The basic idea of VALSE-EP is to iteratively approximate the challenging quantized model of line spectral estimation as a sequence of simple pseudo unquantized models,where VALSE is ***,to obtain a benchmark of the performance of the proposed algorithm,the Cram′er Rao bound(CRB)is ***,numerical experiments on both synthetic and real data are performed,demonstrating the near CRB performance of the proposed VALSE-EP for line spectral estimation from quantized samples.

关键词： variational Bayesian inference expectation propagation quantization line spectral estimation mmse gridless

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

High speed robust image registration and localization using optimized algorithm and its performances evaluation

引用

Journal of Systems Engineering and Electronics 2010年第3期21卷 520-526页

作者： meng An Zhiguo Jiang Danpei zhao School of Astronautics Beihang University Beijing 100191 E R. China

Local invariant algorithm applied in downward-looking image registration,usually computes the camera＇s pose relative to visual ***,there are three requirements in the process of image registration when using these ***,the algorithm is apt to be influenced by ***,algorithm should have less computational ***,the depth information of images needs to be estimated without other *** paper investigates a famous local invariant feature named speeded up robust feature（SURF）,and proposes a highspeed and robust image registration and localization algorithm based on *** supports from feature tracking and pose estimation methods,the proposed algorithm can compute camera poses under different conditions of scale,viewpoint and rotation so as to precisely localize object＇s *** last,the study makes registration experiment by scale invariant feature transform（SIFT）,SURF and the proposed algorithm,and designs a method to evaluate their ***,this study makes object retrieval test on remote sensing *** there is big deformation on remote sensing frames,the registration algorithm absorbs the Kanade-Lucas-Tomasi（KLT） 3-D coplanar calibration feature tracker methods,which can localize interesting targets precisely and *** experimental results prove that the proposed method has a higher localization speed and lower localization error rate than traditional visual simultaneous localization and mapping（vSLAM） in a period of time.

关键词： local invariant features speeded up robust feature(SURF) Harris corner Kanada-Lucas-Tomasi(KLT) transform Coplanar camera calibration algorithm landmarks.

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

Effects of Temperature,Salinity and Stocking Density on Larval Survival and Growth of Reciprocal Crosses Between Two Strains of Pacific Oysters,Crassostrea gigas

引用

Journal of Ocean University of China 2022年第4期21卷 1017-1026页

作者： meng Lingxin XU Chengxun LI qi Key Laboratory of Mariculture Ministry of EducationOcean University of ChinaQingdao 266003China Laboratory for Marine Fisheries Science and Food Production Processes Pilot National Laboratory for Marine Scienceand Technology(Qingdao)Qingdao 266237China

The Pacific oyster Crassostrea gigas is one of the most widely cultivated aquaculture species and contributes signifi-cantly to total seafood production for human ***,mass mortality occurred frequently,and in some regions almost all oysters died during seed production and grow-out *** order to explore whether hybridization breeding can improve its growth and survival,a complete diallel cross between a selected strain‘Haida No.1’(S)and an orange shell variant(O)of *** was carried *** larval growth and survival were compared among hybrids and purebred strains at temperatures of 16,20,24,28 and 32℃;salinities of 15,20,25,30 and 35;and stocking densities of 0.5,1,2,4 and 8 larvae mL−*** different environments,the hybridization between two strains of *** showed the heterosis of growth and *** mean shell height and survival rate of the two reciprocal crosses(OS,SO)were significantly higher than those of the two purebred strains(SS,OO)under all environ-mental *** particular,OS showed greater heterosis than the purebred strains and SO *** results showed that the productive traits of the‘Haida No.1’could be improved by crossing with the orange shell ***,the results from this study also indicated that hybridization between the two strains of *** may be a promising way for breeding new variety with high survival rate.

关键词： Crassostrea gigas heterosis larvae temperature salinity stocking density survival growth

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

An Angle Structure Descriptor for Image Retrieval

引用

China Communications 2016年第8期13卷 222-230页

作者： meng zhao Huaxiang Zhang Lili meng School of Information Science and Engineering Shandong Normal University Institute of Data Science and Technology Shandong Normal University

This paper presents an efficient image feature representation method, namely angle structure descriptor(ASD), which is built based on the angle structures of images. According to the diversity in directions, angle structures are defined in local blocks. Combining color information in HSV color space, we use angle structures to detect images. The internal correlations between neighboring pixels in angle structures are explored to form a feature vector. With angle structures as bridges, ASD extracts image features by integrating multiple information as a whole, such as color, texture, shape and spatial layout information. In addition, the proposed algorithm is efficient for image retrieval without any clustering implementation or model training. Experimental results demonstrate that ASD outperforms the other related algorithms.

关键词： image retrieval angle structure descriptor HSV color space local descriptor

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

Generation of a large orbital angular momentum beam via an optical fiber winding around a curved path and its application

引用

Chinese Physics B 2021年第10期30卷 342-350页

作者： Wei-Han Tan Chao-Ying zhao Yi-Chao meng qi-Zhi Guo Department of Physics Shanghai UniversityShanghai 200444China College of Science Hangzhou Dianzi UniversityHangzhou 310018China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China Institute of Fiber Optics Shanghai UniversityShanghai 200444China

Many papers have been published on the study of orbital angular momentum(OAM)of the laser modes based on the Laguerre-Gaussian(LG)beam and helical phase plate or rotating cylindrical lens,and the principal ray of the LG beam remains straight *** ways are difficult to get a large OAM *** this paper,we propose a novel method to prepare a large OAM modes when the light propagates through a optical fiber winding around a curved path,and establish a theoretical framework based on the principal ray path ***,we investigate three kinds of winding ***,based on the analytical solutions and numerical calculations,we can find that the spiral body can achieve a large OAM temporal *** the same time,based on the zero OAM diffraction diagram,we can obtain an improvement of resolving power beyond Rayleigh’s ***,applying a large OAM diffraction pattern to realize 12-bitencodes,we can obtain a high-security optical information transfer system.

关键词： fiber optics orbital angular momentum(OAM) differential Fernet equation Rayleigh criterion

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

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：