检索结果-南通市图书馆

Effects of Impurity on the Ground—state Transitions of a Quantum Dot in strong Magnetic Field

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2001年第6期35卷 735-739页

作者： k.s.chan E.Y.B.PUN 等 DepartmentofPhysicsandMaterialsscience CityuniversityofHongKongHongKongChina DepartmentofElectronic

The low-lying spectra of parabolic quantum dots with or without an impurity at the center are investigated.While it has been known that the electron-electron interaction leads to ground-state transitions on magic values of angular momentum in a magnetic field. We show, in this paper, that the implantation of an impurity ion at the center can either enhance or suppress such transitions, depending on whether it is an acceptor or a donor ion.

关键词： impurity states quantum dots

Effects of Van der Waals interaction and electric field on the electronic structure of bilayer Mos2

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effects of Van der Waals interaction and electric field on t...

中国化学会第十二届全国量子化学会议

作者： Jin Xiao Mengqiu Long Xinmei Li Qingtian Zhang Hui Xu k.s.chan Institute of super-microstructure and Ultrafast Process in Advanced Materials School of Physics and ElectronicsCentral South University Department of Physics and Materials science City University of Hong Kong

The modification of the electronic structure of bilayer Mo s2 by an external electric field can have potential applications in optoelectronics and ***,the underlying physical mechanism is not clearly understood,especially the effects of the Van der Waals *** this study,the spin orbit coupled electronic structure of bilayer Mo s2 has been investigated using the first-principle density functional *** find that the Van der Waals interaction as well as the interlayer distance have significant effects on the band *** the interlayer distance of bilayer Mo s2 increases from 0.614 nm to 0.71 nm,the indirect gap between the г and T points increases from 1.25 e V to 1.70 e ***,the energy gap of bilayer Mo s2 transforms from an indirect one to a direct *** external electric filed can shift down（up）the energy bands of the bottom（top）Mo s2 layer,and also breaks the inversion symmetry of bilayer Mo *** a result,the electric field can affect the band gap and the spin-orbit interaction splitting are also modified by the external electric field,when the valance bands are split into two groups of *** present study can help us understand more about the electronic structures of Mo s2 materials for potential applications in electronics and optoelectronics.

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

子系统与系统稳定性的註(英文)

工程数学学报 1984年第2期 43-51页

作者： k.s.chan H.Tong Chinese University of Hong kong

本文讨论了非线性时间序列分析模型中,由k个子系统组成的系统的稳定性与子系统稳定性的关系,指出,如果子系统是正稳定的,系统未必是正稳定的。

关键词：数学学报

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

控水诊断图

国外油田工程 1996年第10期12卷 24-27页

作者： k.s.chan 夏克英大庆石油学院

在石油开采中，已研究了一种用于确定过量产水产气机理的新方法，并得到了验证。以油藏水锥和水窜问题的系统数值模拟为基础，人们发现，驱替机理不同，WOR与时间及GOR与时间的双对数图表现出不同的特征，利用WOR或GOR对时间的导数可以... 详细信息

在石油开采中，已研究了一种用于确定过量产水产气机理的新方法，并得到了验证。以油藏水锥和水窜问题的系统数值模拟为基础，人们发现，驱替机理不同，WOR与时间及GOR与时间的双对数图表现出不同的特征，利用WOR或GOR对时间的导数可以判别油井是水锥还是气锥，是高渗层见水还是井底附近水窜。该方法对德克萨斯、加利福尼亚、墨西哥湾岸区和阿拉斯加油田的某些井进行了应用，利用实际生产数据图，确定产生问题的机理。结合油井测试和生产测井资料，利用该方法选择措施井，并对增产措施进行优化，可以加速投资的回收。

关键词：水油比水锥控水诊断图水窜采油技术

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

控水诊断图

石油石化节能 1996年第10期 24-27页

作者： k.s.chan 夏克英大庆石油学院

关键词：水油比水锥控水诊断图水窜

Multi-omic analyses identify mucosa bacteria and fecal metabolites associated with weight loss after fecal microbiota transplantation

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

The Innovation 2022年第5期3卷 129-139页

作者： Fen Zhang Tao Zuo Yating Wan Zhilu Xu Chunpan Cheung Amy YLi Wenyi Zhu Whitney Tang Paul k.s.chan Francis k.L.chan siew C.Ng Department of Medicine and Therapeutics Institute of Digestive DiseaseState Key Laboratory of Digestive DiseasesLKS Institute of Health SciencesThe Chinese University of Hong KongHong Kong 999077China Microbiota I-Center(MagIC) Hong Kong 999077China Department of Microbiology The Chinese University of Hong KongHong Kong 999077China Center for Gut Microbiota Research Faculty of MedicineThe Chinese University of Hong KongHong Kong 999077China

Fecal microbiota transplantation(FMT)has shown promising results in animal models of obesity,while results in human studies are *** aimed to determine factors associated with weight loss after FMT in nine obese subjects using serial multi-omics analysis of the fecal and mucosal *** mucosal microbiome,fecal microbiome,and fecal metabolome showed individual clustering in each subject after *** colonic microbiome in patients showed more marked variance after FMT compared with the duodenal microbiome,characterized by an increased relative abundance of *** who lost weight after FMT sustained enrichment of Bifidobacterium bifidum and Alistipes onderdonkii in the duodenal,colonic mucosal,and fecal microbiome and increased levels of phosphopantothenate biosynthesis and fecal metabolite eicosapentaenoic acid(EPA),compared with those without weight *** levels of amino acid metabolism-associated were positively correlated with the fecal abundance of ***,and fatty acid metabolism-associated metabolites showed positive correlations with ***.

关键词： metabolism sustained weight

New evidence for the epigenetic regulation of skeletal stem cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

science Bulletin 2024年第13期69卷 2004-2006页

作者： Liming Zhao Jun Xiao Charles k.F.chan Institute for stem Cell Biology and Regenerative Medicine Stanford University School of MedicineStanford CA 94305USA Department of surgery Division of Plastic and Reconstructive SurgeryStanford University School of MedicineStanford CA 94305USA Department of Orthopaedic surgery Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China

skeletal stem cells(ssCs)are crucial for skeletal development and regeneration,yet the epigenetic regulation of these cells remains poorly *** studies have delineated the epigenetic landscape across the developmental trajectory of ssCs,highlighting the involvement of Ptip in regulating ssC *** skeletal system undergoes dynamic remodeling throughout *** stem cells(ssCs),residing within the skeleton and lineage-restricted,serve as a cellular reserve to foster development and maintain skeletal *** categorized within the broader mesenchymal stromal/stem cells(MsCs).

关键词： skeletal involvement maintain

A harmonisation approach to traditional Chinese medicine registration in Asian countries

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 Traditional Chinese Medical sciences 2024年第2期11卷 143-147页

作者： Vivian s.W.chan Fung Independent scholar 2 Woodward PlaceSt IvesNSW 2075Australia

The traditional Chinese medicine(TCM)industry is critical to not only for public health but also for economic *** to the European Union(EU)directives,under the EU framework for(traditional)herbal medicinal products,herbal medicines with long history of use can be registered in ***,there is a condition in this directive in which only those that have at least 10e15 years in the EU market are accepted for registration and/or marketing *** author opinion,the condition of 10-15 years of use in EU countries set within the EU regulatory framework is with consideration of the genetic differences which can result in variation in adverse drug responses among different world *** this concept in mind,it is reasonable to project the principal of the EU directive to the Asian countries where TCM is *** like China,singapore,Japan and south korea that have well established drug registration framework are in best position in executing the best practice and facilitate harmonization of registration for TCM within the ***,the registration process itself allows more safety and efficacy data to be collected systemically before and after product registration/marketing *** are valuable information for future drug *** therapeutic value of TCM is limitless,it has been left out in the EU regulatory framework,and the opportunity for it to be expanded and carried forward in modern medicines is shadowed by the limited number of TCM that are qualified to be registered under the EU regulatory *** early establishment of a harmonized risk-based registration process for TCM in Asian countries is *** will strengthen the database to substantiate the history of safe use and further preserving and expanding the therapeutic values of TCM within and beyond the Asian region.

关键词： Traditional Chinese medicines Population genetic Harmonization Registration Asian countries

Understanding the corrosion and bio-corrosion behaviour of Magnesium composites – a critical review

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 Magnesium and Alloys 2024年第3期12卷 890-939页

作者： Prithivirajan sekar s.k.Panigrahi Department of Mechanical Engineering Indian Institute of Technology MadrasChennai600036India Applied Magnesium Research Center Center of Excellence in Materials and Manufacturing for Futuristic MobilityIndian Institute of Technology MadrasChennai600036India

Realising the potential of Magnesium(Mg),several globally leading ventures have invested in the Mg industry,but their relatively poor corrosion resistance is a never ending saga till *** corrosion and bio-corrosion behaviour of Mg has gained research attention and still remains a hot topic in the application of automobile,aerospace and biomedical *** intrinsic high electrochemical nature of Mg limits their utilization in diverse *** scenario has prompted the development of Mg composites with an aim to achieve superior corrosion and bio-corrosion *** present review enlightens the influence of grain size(Gs),secondary phase,texture,type of matrix and reinforcement on the corrosion and bio-corrosion behaviour of Mg ***,the corrosion and bio-corrosion behaviour of Mg composites manufactured by primary and secondary processing routes are ***,the comprehensive corrosion and bio-corrosion mechanisms of these Mg composites are ***,the individual role of Gs,texture and corrosive medium on corrosion and bio-corrosion behaviour of Mg composites are clarified and *** challenges encountered,unanswered issues in this field are explained in detail and accordingly the scope for future research is *** review is presented from basic concrete background to advanced corrosion mechanisms with an aim of creating interest among the readers like students,researchers and industry experts from various research ***,the corrosion and bio-corrosion behaviour of Mg composites are critically reviewed for the first time to:(i)contribute to the body of knowledge,(ii)foster research and development,(iii)make breakthrough,and(iv)create life changing innovations in the field of Mg composite corrosion.

关键词： Corrosion Bio corrosion Magnesium alloys Magnesium composites Magnesium implants.