检索结果-南通市图书馆

维普期刊数据库

On Boundary Factors and Traces of Subgroups of Finite Groups

在线全文

学校读者我要写书评

暂无评论

Communications in Mathematics and Statistics 2014年第3期2卷 349-361页

作者： w.guo Alexander N.Skiba X.Tang School of Mathematical Sciences University of Science and Technology of ChinaHefei 230026People’s Republic of China Department of Mathematics Francisk Skorina Gomel State University246019 GomelBelarus

A subgroup E of a finite group G is called hypercyclically embedded in G if every chief factor of G below E is *** A be a subgroup of a group *** we call any chief factor H/AG of G a G-boundary factor of *** any G-boundary factor H/AG of A,we call the subgroup(A∩H)/AG of G/AG a G-trace of *** the basis of these notions,we give some new characterizations of hypercyclically embedded subgroups.

关键词： Finite group Hypercyclically embedded subgroup G-boundary factor G-trace of subgroup Meet-irreducible subgroup

THE INTERFACIAL BEHAVIORS OF ALUMINUM MATRIX COMPOSITE IN DIFFERENT wELDING METHODS

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

Acta Metallurgica Sinica(English Letters) 2004年第1期17卷 55-60页

作者： w.guo J.T.Niu J.F.Zhai G.T.Zhou M.Z.wang State Key Laboratory of Advanced welding Production Technology Harbin Institute of Technology(HIT)Harbin150001China State Key Laboratory of Metal Matrix Composite Shanghai Jiaotong University.Shanghai 200030.China

Non-interlayer liquid phase diffusion welding (China Patent) and laser welding methods for aluminum matrix composite are mainly described in this paper. In the non-interlayer liquid phase diffusion welding, the key processing parameters affecting the strength of joint is welding temperature. when temperature rises beyond solidus temperature, the bonded line vanishes. The strength of joint reaches the maximum and becomes constant when welding temperature is close to liquid phase temperature. Oxide film in the interface is no longer detected by SEM in the welded joint. with this kind of technique, particle reinforced aluminum matrix composite Al2 O3p/6061Al is welded successfully, and the joint strength is about 80% of the strength of composite (as-casted). In the laser welding, results indicate that because of the huge specific surface area of the reinforcement, the interfacial reaction between the matrix and the reinforcement is restrained intensively at certain laser power and pulsed laser beam. The laser pulse frequency directly affects the reinforcement segregation and the reinforcement distribution in the weld, so that the weldability of the composite could be improved by increasing the laser pulse frequency. The maximum strength of the weld can reach 70% of the strength of the parent.

关键词： non-interlayer liquid phase diffusion welding Al2O3p/6061 Alaluminum matrix composite laser welding interface behavior reinforcement

维普期刊数据库

Estimates of Maize Plant Density from UAV RGB Images Using Faster-RCNN Detection Model:Impact of the Spatial Resolution

在线全文

学校读者我要写书评

暂无评论

Plant Phenomics 2021年第1期3卷 181-196页

作者： K.Velumani R.Lopez-Lozano S.Madec w.guo J.Gillet A.Comar F.Baret Hiphen SAS 120 Rue Jean DaussetAgroparcBâtiment Technicité84140 AvignonFrance INRAE UMR EMMAHUMT CAPTE228 Route de l'AérodromeDomaine Saint Paul-Site Agroparc CS 4050984914 Avignon Cedex 9France Arvalis 228Route de l'Aérodrome-CS 4050984914 Avignon Cedex 9France International Field Phenomics Research Laboratory Institute for Sustainable Agro-Ecosystem ServicesGraduate School of Agricultural and Life SciencesThe University of TokyoTokyoJapan

Early-stage plant density is an essential trait that determines the fate of a genotype under given environmental conditions and management *** use of RGB images taken from UAVs may replace the traditional visual counting in fields with improved throughput,accuracy,and access to plant ***,high-resolution images are required to detect the small plants present at the early *** study explores the impact of image ground sampling distance(GSD)on the performances of maize plant detection at three-to-five leaves stage using Faster-RCNN object detection *** collected at high resolution(GSD≈0:3 cm)over six contrasted sites were used for model *** additional sites with images acquired both at high and low(GSD≈0:6 cm)resolutions were used to evaluate the model *** show that Faster-RCNN achieved very good plant detection and counting(rRMSE=0:08)performances when native high-resolution images are used both for training and ***,good performances were observed(rRMSE=0:11)when the model is trained over synthetic low-resolution images obtained by downsampling the native training high-resolution images and applied to the synthetic low-resolution validation ***,poor performances are obtained when the model is trained on a given spatial resolution and applied to another spatial *** on a mix of high-and low-resolution images allows to get very good performances on the native high-resolution(rRMSE=0:06)and synthetic low-resolution(rRMSE=0:10)***,very low performances are still observed over the native low-resolution images(rRMSE=0:48),mainly due to the poor quality of the native low-resolution ***,an advanced super resolution method based on GAN(generative adversarial network)that introduces additional textural information derived from the native high-resolution images was applied to the native low-resolution validation *** show some signi

关键词： RCNN Faster Image

NON-INVASIVE DIELECTRIC EVALUATION BY SCANNING MICROwAVE FREQUENCY OR INCIDENT DIRECTION

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

NON-INVASIVE DIELECTRIC EVALUATION BY SCANNING MICROWAVE FRE...

自发性颈颅动脉夹层的初始和随访高分辨血管壁MRI研究

2nd International Symposium on Recent Advances in Microwave Technology(ISRAMT’89)

作者： Theodore C.guo wendy w.guo Potomac Research Inc.PotomacMaryland 20854 The Catholic University of America WashingtonD.C.20064

＜正＞A theory of dielectric imaging by inverse Fraunhoffer scattering is *** parameters are devised for scanning to retrieve three-dimensional target *** is shown that the image can differentiate dielectric permittivity up to±0.25,and yield a resolution up to 1mm in all three dimensions. Results from computer simulation are shown to agree to these theoretical estimates.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

国际医学放射学杂志 2024年第3期 374-374页

作者： X.Lin w.guo D.She Y.Kang Z.Xing D.Cao 孔令红

摘要目的探讨继发于自发性颈颅动脉夹层（sCCAD）的缺血性脑卒中相关因素，并评估与结局相关的初始影像学标志物。方法回顾性分析连续性sCCAD病人的初始和随访

关键词：

Numerical Simulation of Highly Constricted Plasma Cutting Arc

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Numerical Simulation of Highly Constricted Plasma Cutting Ar...

Molecular“Coupled Butterfly”on Ag(110):Experiment and First-principles Calculations

The 9th Asia-Pacific Conference on Plasma Science and Technology and 21st Symposium on Plasma Science for Materials

作者： Q.Zhou~a S.guo~a w.guo~a P.Xu~a a Institute of Modern Physics Fudan University Shanghai 200433 P.R..China

＜正＞In recent years,metal plasma cutting processes have increasingly attracted the attention of industry.A fundamental understanding of the various physical characteristics on the plasma arc is indispensable to desi...

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Molecular“Coupled Butterfly”on Ag(110):Experiment and Firs...

68Ga-FAPI PET/CT检测转移性甲状腺癌：与18F-FDG PET/CT比较

2005年纳米和表面科学与技术全国会议

作者： w.guo S.X.Du H.-J.Gao Nanoscale Physics & Devices Laboratory,Institute of Physics,CAS,Beijing 100080

The adsorption behavior of organic π-conjugated molecules on single crystals is ofgreat interest because their physical and chemical properties are keys for molecularscale self-assembly,which is important to improve properties of electronic andoptoelectronic devices such as light-emitting diodes,field-effect transistors and thinfilm *** studying the adsorption behavior of these molecules theunderstanding of adsorption processes can be *** our work,one aromatic

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

国际医学放射学杂志 2022年第5期45卷 607-608页

作者： H.Fu J.wu J.X.Huang L.Sun H.wu w.guo 冉淑华

摘要Ga标记的成纤维细胞活化蛋白抑制剂(FAPI)已被提议作为一种潜在的放射性示踪剂用于识别癌性病变，但其在识别转移性分化型甲状腺癌(DTC)的实用性上尚未得

关键词：

基于深度学习的CT成骨性转移瘤和骨岛诊断：一项多中心诊断研究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

国际医学放射学杂志 2023年第6期 748-749页

作者： Y.C.Xiong w.guo Z.P.Liang L.wu G.X.Ye Y.Y.Liang 周彤

摘要目的开发并验证基于CT的骨岛和成骨性转移瘤的深度学习（DL）模型。方法回顾性分析3家医院的硬化性骨病变（SBL）病人。来自医院1的影像被随机分配用于开发

关键词：