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Atomic-scale strain analysis for advanced Si/SiGe heterostructure by using transmission electron microscopy

IEEE 2005 International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications

作者： kin seong leong Mun Leng Ng Peter H. Cole Auto-ID Laboratory Department of Electrical & Electronic Engineering The University of Adelaide Auto-ID Laboratory Department of Electrical & Electronic Engineering The University of Adelaide Member IEEE Auto-ID Laboratory Department of Electrical & Electronic Engineering The University of Adelaide

In a multi-reader environment, RFID system performance will be limited by the reader collision problem. RFID readers use different channels to minimise collision. However, with limited channels, the i

关键词： THE READER COLLISION PROBLEM IN RFID SYSTEMS

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Electron 2024年第2期2卷 29-52页

作者： Lan Li Ran Bi Zuoyuan Dong Changqing Ye Jing Xie Chaolun Wang Xiaomei Li kin-leong Pey Ming Li Xing Wu School of Integrated Circuits East China Normal UniversityShanghaiChina School of Integrated Circuits Peking UniversityBeijingChina Engineering Product Development Pillar Singapore University of Technology and DesignSingaporeSingapore

Three-dimensional stacked transistors based on Si/SiGe heterojunction are a potential candidate for future low-power and high-performance computing in integrated *** and accurately measuring strain in Si/SiGe heterojunctions is critical to increasing carrier mobility and improving device *** electron microscopy(TEM)with high spatial resolution and analytical capabilities provides technical support for atomic-scale strain measurement and promotes significant progress in strain mapping *** paper reviews atomic-scale strain analysis for advanced Si/SiGe heterostructure based on TEM ***-beam electron diffraction,nano-beam electron diffraction,dark-field electron holography,and high-resolution TEM with geometrical phase analysis,are comprehensively discussed in terms of spatial resolution,strain precision,field of view,reference position,and data ***,the advantages and critical issues of these strain analysis methods based on the TEM technique are sum-marized,and the future direction of TEM techniques in the related areas is prospected.

关键词： GPA heterostructure Si/SiGe strain transmission electron microscopy

Childhood Langerhans cell histiocytosis:a disease with many faces

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World Journal of Pediatrics 2019年第6期15卷 536-545页

作者： Alexander K.C.Leung Joseph M.Lam kin Fon leong Department of Pediatrics The University of Calgaryand The Alberta Children's Hospital#20023316th Avenue NWCalgaryAB T2M 0H5Canada Department of Pediatrics University of British ColumbiaVancouverBCCanada Department of Dermatology and Skin Sciences University of British ColumbiaVancouverBCCanada Pediatric Institute Kuala Lumpur General HospitalKuala LumpurMalaysia

Background Langerhans cell histiocytosis(LCH)is a group of diseases characterized by the proliferation and accumulation of Langerhans *** presentations of LCH vary *** sources A PubMed search was conducted using Clinical Queries with the key term "Langerhans cell histiocytosis".The search strategy included meta-analyses,randomized controlled trials,clinical trials,observational studies,and *** paper is based on,but not limited to,the search *** Generally,patients with LCH can be divided into two groups based on the extent of involvement at diagnosis,namely,single-system LCH and multisystem *** involvement may be unifocal or *** with isolated bone lesions typically present between 5 and 15 years of age,whereas those with multisystem LCH tend to present before 5 years of *** clinical spectrum is broad,ranging from an asymptomatic isolated skin or bone lesion to a life-threatening multisystem *** manifestations include,among others,"punched out" lytic bone lesion,seborrheic dermatitis-like erup-tion,erythematous/reddish-brown crusted/scaly papules/maculopapules/plaques/patches,and eczematous lesions,diabetes insipidus,hepatosplenomegaly,cytopenias,lymphadenopathy,and an acute fulminant disseminated multisystem condition presenting with fever,skin rash,anemia,thrombocytopenia,lymphadenopathy,and *** diagnosis is clinicopathologic,based on typical clinical findings and histologic/immunohistochemical examination of a biopsy of lesional *** CD1a,S100,and/or CD207(Langerin)immunohistochemical staining of lesional cells is required for a definitive *** waiting is recommended for patients with skin-only *** with symptomatic or refractory skin-only LCH may be treated with topical tacrolimus/corticosteroids,topical nitrogen mustard,oral methotrexate,or oral *** current recommended first-line therapy for patients with multisystem LCH i

关键词： Cytopenia Diabetes insipidus Eczematous lesions Hepatosplenomegaly Lymphadenopathy Seborrheic dermatitis-like eruption

Staphylococcal-scalded skin syndrome:evaluation,diagnosis,and management

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World Journal of Pediatrics 2018年第2期14卷 116-120页

作者： Alexander K.C.Leung Benjamin Barankin kin Fon leong Department of Pediatrics The Alberta Children's HospitalThe University of CalgaryCalgary#200233-16th Avenue NWCalgaryAB T2M 0H5Canada Toronto Dermatology Centre TorontoONCanada The Pediatric Institute Kuala Lumpur General HospitalKuala LumpurMalaysia

Background Staphylococcal-scalded skin syndrome(SSSS),also known as Ritter disease,is a potentially life-threatening disorder and a pediatric *** diagnosis and treatment is imperative to reduce the morbidity and mortality of this *** purpose of this article is to familiarize physicians with the evaluation,diagnosis,and treatment of *** sources A PubMed search was completed in Clinical Queries using the key terms"Staphylococcal scalded skin syn-drome"and"Ritter disease".Results SSSS is caused by toxigenic strains of Staphylococcus *** of the amino-terminal extracellular domain of desmoglein 1 by staphylococcal exfoliative toxins results in disruption of keratinocytes adhesion and cleavage within the stratum granulosum which leads to bulla *** diagnosis is mainly clinical,based on the findings of tender erythroderma,bullae,and desquamation with a scalded appearance especially in friction zones,periorificial scabs/crusting,positive Nikolsky sign,and absence of mucosal *** empiric treatment with intravenous anti-staphylococcal antibiotic such as nafcillin,oxacillin,or flucloxacillin is essential until cultures are available to guide *** or cefuroxime may be used should the patient have penicillin *** the patient is not improving,critically ill,or in com-munities where the prevalence of methicillin-resistant *** is high,vancomycin should be *** A high index of suspicion is essential for an accurate diagnosis to be made and treatment promptly initiated.

关键词： Blisters Desquamation Erythroderma Exfoliative toxins Staphylococcus aureus

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Erythema nodosum

World Journal of Pediatrics 2018年第6期14卷 548-554页

作者： Alexander K.C.Leung kin Fon leong Joseph M.Lam Department of Pediatrics The Alberta Children's HospitalThe University of Calgary#200233-16th Avenue NWCalgaryAB T2M 0H5Canada Pediatric Institute Kuala Lumpur General HospitalKuala LumpurMalaysia Department of Pediatrics and Department of Dermatology and Skin Sciences University of British ColumbiaVancouverBCCanada

Background Erythema nodosum can be associated with a number of systemic diseases. There is, however, a paucity of information in the pediatric literature on this condition. The purpose of this article is to familiarize pediatricians with the evaluation, diagnosis, and treatment of erythema nodosum. Data sources A PubMed search was completed in Clinical Queries using the key terms 'erythema nodosum'. Results Clinically, erythema nodosum presents with a sudden onset of painful, erythematous, subcutaneous nodules mainly localized to the pretibial areas. Lesions are usually bilateral and symmetrical, ranging from 1 to 5 cm in diameter. Erythema nodosum may be associated with a variety of conditions such as infection, medications, sarcoidosis, pregnancy, inflamma-tory bowel disease, vaccination, autoimmune disease, malignancy, and miscellaneous causes. The condition is idiopathic in approximately 50% of cases. The diagnosis is mainly clinical with biopsy reserved for atypical cases. To evaluate for the underlying cause, some basic laboratory screening studies are worthwhile in most cases and include a complete blood cell count, erythrocyte sedimentation rate and/or C-reactive protein, throat swab culture, antistreptococcal O titers, and a chest radiograph. Other tests should be individualized, guided by the history and physical examination results. Most cases of ery-thema nodosum are self-limited and require no treatment. Bed rest and leg elevation are generally recommended to reduce the discomfort. Nonsteroidal anti-inflammatory drugs are the first-line treatment for pain management. Conclusions As erythema nodosum is often a cutaneous manifestation of a systemic disease, a thorough search should be performed to reveal the underlying cause.

关键词： Drug-induced Group A β-hemolytic streptococcal infection Sarcoidosis Subcutaneous pretibial nodules Tuberculosis Yersinia infection

Gianotti-Crosti syndrome(papular acrodermatitis of childhood)in the era of a viral recrudescence and vaccine opposition

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World Journal of Pediatrics 2019年第6期15卷 521-527页

作者： Alexander K.C.Leung Consolato Maria Sergi Joseph M.Lam kin Fon leong Department of Pediatrics The University of CalgaryCalgaryCanada The Alberta Children's Hospital #200233-16th Avenue NWCalgaryAB T2M OH5Canada The University of Alberta EdmontonABCanada Departments of Pediatrics Dermatology and Skin SciencesUniversity of British ColumbiaVancouverBCCanada Pediatric Institute Kuala Lumpur General HospitalKuala LumpurMalaysia

Background Gianotti-Crosti syndrome is characterized by an acute onset of a papular or papulovesicular eruption with a symmetrical *** sources A PubMed search was conducted using Clinical Queries with the key terms"Gianotti-Crosti syndrome"OR"papular acrodermatitis".The search strategy included meta-analyses,randomized controlled trials,clinical trials,observa-tional studies,and *** paper is based on,but not limited to,the search *** The eruption of Gianotti-Crosti syndrome is found predominantly on the cheeks,extensor surfaces of the extremities,and *** is a sparing of antecubital and popliteal fossae as well as palms,soles,and mucosal *** often asymptomatic,the lesions may be mildly to moderately ***-Crosti syndrome is most common in children between 1 and 6 years of *** Epstein-Barr virus and the hepatitis B virus are the most common pathogens associated with Gianotti-Crosti *** treatment for Gianotti-Crosti syndrome is necessary because it is *** an era of vaccine hesitancy and refusal,Gianotti-Crosti syndrome may be important to mention to parents,because it can occur and trigger *** Gianotti-Crosti syndrome is mainly a disease of early childhood,characterized by an acute onset of a papular or papulovesicular eruption with a symmetrical *** the advent of more universal vaccination against hepatitis B virus,Epstein-Barr virus has become the most common etiologic agent of Gianotti-Crosti *** cases of post-vaccination Gianotti-Crosti syndrome have been ***,the emphasis should be placed on its self-limiting attribution.

关键词： Epstein-Barr virus Hepatitis B virus Papular acrodermatitis Papular symmetrical eruption

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溶剂效应与过渡金属催化反应的理论研究

溶剂效应与过渡金属催化反应的理论研究

作者：梁柏健（Pak kin leong）南京大学

学位级别：硕士

确定化学反应机理是研究化学反应的一个重要研究内容,通过结合量子化学计算程序和化学理论知识的方法可以从理论上获得化学反应历程。本文对两个反应体系的机理进行了理论研究。研究内溶涉及到过渡金属催化反应以及溶剂效应对反应的影... 详细信息

确定化学反应机理是研究化学反应的一个重要研究内容,通过结合量子化学计算程序和化学理论知识的方法可以从理论上获得化学反应历程。本文对两个反应体系的机理进行了理论研究。研究内溶涉及到过渡金属催化反应以及溶剂效应对反应的影响进行了讨论。本文第一部份工作研究了芳烃与丙烯酸酯偶联反应中的溶剂效应,通过DFT理论计算得到可行的反应路径以及能量关系。首先间接验证了[Cp*RhC12]2活化芳烃的C—H键是决速步。接着在β-OAc消除和β-H消除两条路径中,发现溶剂有一定的调控作用,结合反应速率计算,最后解释了在甲醇溶剂中,该反应容易发生β-OAc消除,而在THF溶剂中,该反应容易发生β-H消除。本文第二部份工作研究了不同催化剂催化巢式碳硼烷B—H键和喹啉N—H键构建N→B配位化合物3.2的反应机理,通过计算得出在（COD）Ru（OTf）2催化作用下,原料3.1经过N—H键和C—H键活化生成中间体3-Ru,随后经过氢转移和B—N成键得到目标产物3.2。在Pd（OAc）2催化作用下,原料3.1经过N—H键和B—H键活化,其后直接B—N偶联生成目标产物。本文第三部分主要简述本人在硕士期间参与的一些工作总结。

关键词：理论计算 DFT 反应机理反应速率溶剂效应 B—N键硼氮偶联

Dielectric Breakdown-Recovery in Logic and Resistive Switching in Memory-Bridging the Gap between the Two Phenomena

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Dielectric Breakdown-Recovery in Logic and Resistive Switchi...

钯催化苄基的C(sp^3)—H键活化合成芳酸苄酯

2012 IEEE 11th International Conference on Solid-State and Integrated Circuit Technology(ICSICT-2012)

作者： kin leong Pey Nagarajan Raghavan Xing Wu Wenhu Liu Michel Bosman Singapore University of Technology and Design(SUTD) Division of Microelectronics School of EEENanyang Technological University(NTU) A*STAR Institute of Materials Research and Engineering(IMRE) 3 Research Link

Dielectric breakdown is a well documented phenomenon studied for logic transistors using SiO2/SiON and HfO2 as the oxide material with thickness ranging from 1-5 nm. Recovery of dielectric breakdown has also been reported recently and its implications on the prolonged time dependent dielectric breakdown（TDDB）lifetime are very ***,in the non-volatile memory arena,orders of magnitude change in conductance of the oxide has been observed for different voltage levels, voltage polarities and current densities,which is commonly referred to as"resistive switching". Interestingly,although the gate stacks used for logic and memory applications are very similar in the materials used and dimensions as well,the mechanisms postulated to explain the breakdown-recovery mechanism in logic and switching mechanism in memory are very different. Often,the mechanism underlying switching tends to be very speculative without any convincing physical and electrical evidence that confirms the underlying kinetics of the reversible conductance state transition process. The issue stems from the fact that researchers in logic and memory operate in two distinct domains and seldom interact with each other and as a result,the link between the devices used for these two applications is not clearly recognized by most *** this study,we will bridge the gap between these two phenomena and take advantage of our understanding of dielectric breakdown and recovery to convincingly explain the fundamental physics governing the switching process.

关键词： Switches Logic gates Electrodes Dielectric breakdown Metals Market research

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有机化学 2017年第10期37卷 2669-2677页

作者：端木丹丹梁柏健蒋其柏燕红南京大学化学化工学院配位化学重点实验室南京210093 江苏扬农化工股份有限公司扬州225009

主要介绍了一种新的Pd(Ⅱ)催化苄基C(sp^3)—H键直接功能化合成反应,制备了一系列芳酸苄基酯类产物.这类反应具有较高的官能团容忍性、较为宽泛的底物范围及相对较为温和的反应条件,同时底物中存在多个C(sp^3)—H键位点时能选择性构建... 详细信息

主要介绍了一种新的Pd(Ⅱ)催化苄基C(sp^3)—H键直接功能化合成反应,制备了一系列芳酸苄基酯类产物.这类反应具有较高的官能团容忍性、较为宽泛的底物范围及相对较为温和的反应条件,同时底物中存在多个C(sp^3)—H键位点时能选择性构建目标产物,通过初步的控制实验提出了Pd(Ⅱ)/Pd(IV)的氧化偶联反应机理.

关键词：钯(II)催化 C—H活化芳酸苄酯过氧酯