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Real-time dynamics and cross-correlation gating spectroscopy of free-carrier Drude slow-light solitons

Light(Science & Applications) 2017年第1期6卷 729-736页

作者： Heng Zhou Shu-Wei Huang Xiujian Li James F McMillan Chi Zhang Kenneth kin-Yip wong Mingbin Yu Guo-Qiang Lo Dim-Lee Kwong Kun Qiu Chee Wei wong Key Lab of Optical Fiber Sensing and Communication Networks University of Electronic Science and Technology of ChinaChengdu 611731China Optical Nanostructures Laboratory Columbia UniversityNew YorkNY 10027USA Mesoscopic Optics and Quantum Electronics Laboratory University of CaliforniaLos AngelesCA 90095USA College of Science National University of Defense TechnologyChangshaHunan 410073China Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina Institute of Microelectronics Agency for ScienceTechnology and ResearchScience ParkⅡSingapore 117685Singapore

Optical solitons—stable waves balancing delicately between nonlinearities and dispersive effects—have advanced the field of ultrafast optics and dynamics,with contributions spanning from supercontinuum generation to soliton fission,optical event horizons,Hawking radiation and optical rogue waves,among ***,we investigate picojoule soliton dynamics in silicon slow-light,photonic-bandgap waveguides under the influence of Drude-modeled,free-carrier-induced nonlinear *** real-time and single-shot amplified dispersive Fourier transform spectroscopy simultaneously with high-fidelity cross-correlation frequency resolved optical gating at femtojoule sensitivity and femtosecond resolution,we examine the soliton stability limits,the soliton dynamics including free-carrier quartic slow-light scaling and acceleration,and the Drude electron–hole plasma-induced perturbations in the Cherenkov radiation and modulation *** real-time single-shot and time-averaged cross-correlation measurements are matched with our detailed theoretical modeling,examining the reduced group velocity free-carrier kinetics on solitons at the picojoule scale.

关键词： nonlinear kinetics optical solitons photonic bandgap materials

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Cloaking nanosecond events at any time

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Frontiers of Optoelectronics 2020年第2期13卷 188-189页

作者： Bowen LI Kenneth kin-Yip wong Department of Electrical Computerand Energy EngineeringUniversity of ColoradoBoulderColoradoUSA Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina

The concept of cloaking has never failed to fascinate scientific *** recent years,the idea has ignited a whole new trend of research effort when extended to temporal domain.A typical temporal cloak conceals events from probing light by creating a temporal intensity gap(cloaking time)that will later be closed back by manipulating the speed of light leveraging the chromatic dispersion in dielectric media.

关键词： domain. dielectric dispersion

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Real-time transition dynamics and stability of chipscale dispersion-managed frequency microcombs

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Light(Science & Applications) 2020年第1期9卷 1520-1529页

作者： Yongnan Li Shu-Wei Huang Bowen Li Hao Liu Jinghui Yang Abhinav Kumar Vinod Ke Wang Mingbin Yu Dim-Lee Kwong Hui-Tian Wang Kenneth kin-Yip wong Chee Wei wong Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory University of CaliforniaLos AngelesCA 90095USA School of Physics and The MOE Key Laboratory of Weak Light Nonlinear Photonics Nankai UniversityTianjinChina Department of Electrical Computer and Energy EngineeringUniversity of Colorado BoulderBoulderCO 80309USA Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina Institute of Microelectronics A*STARSingapore 117865Singapore

Femtosecond mode-locked laser frequency combs have served as the cornerstone in precision spectroscopy,alloptical atomic clocks,and measurements of ultrafast *** frequency microcombs based on nonlinear microresonators have been examined,exhibiting remarkable precision approaching that of laser frequency combs,on a solid-state chip-scale platform and from a fundamentally different physical *** recent successes,to date,the real-time dynamical origins and high-power stabilities of such frequency microcombs have not been fully ***,we unravel the transitional dynamics of frequency microcombs from chaotic background routes to femtosecond mode-locking in real time,enabled by our ultrafast temporal magnifier metrology and improved stability of dispersion-managed dissipative *** our dispersion-managed oscillator,we further report a stability zone that is more than an order-of-magnitude larger than its prior static homogeneous counterparts,providing a novel platform for understanding ultrafast dissipative dynamics and offering a new path towards high-power frequency microcombs.

关键词： dispersion stability dynamics

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Impact of IPMOE on nursing tasks in the medical ward: A time-motion study

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International Journal of Nursing Sciences 2018年第1期5卷 50-56页

作者： Ming Leung Kenny kin Chung Chan Wing Leung wong Alexander Chun Bon Law Princess Margaret Hospital Hong KongChina Tuen Mun Hospital Hong KongChina Hong Kong Baptist University Hong KongChina

Introduction:The In-patient Medication Order Entry System (IPMOE) was first implemented in the medical ward of Princess Margaret Hospital,Hong *** was a local developed close-loop system including prescription,dispensing and administration *** on its impact on nursing tasks would be important for practice improvement and subsequent system ***:The study was conducted to quantify the nursing times across medication-associated tasks for paper-based MAR and computer-based IPMOE,including change in the tasks and time patterns before and after IPMOE ***:This was a prospective observation study in medical wards before (Jan 2014-Jun 2014) and after (Mar 2015-Jun 2015) the implementation of *** conducted 8-hr observation studies of individual nurses with a customized application to time various pre-categorized nursing *** inferences and interrupted time series analysis was performed to identify the change in the intercept and trends over time after ***:The average number of medication-related tasks was significantly reduced from 61.07 to 29.81,a reduction of 31.26 episodes per duty (P < 0.001,95% CI 22.9-39.63).The time for the medication-related tasks was reduced from 32 min (SD =21.57) to 26.57 min (SD =11.35) and the medication administration time increased from 37.93 min (SD-14.78) to 44.37 min (SD 19.45),but there was no overall significant difference in the time spent on each duty (P =0.315) between the two *** improving trend in the delayed effect was observed (P =0.03),which indicated a run-in period for new application was needed in clinical ***:Our study had shown the time motion observation could be applied to measure the impact of the IPMOE in a busy clinical *** classification of activities,validation,objective measurement and longitudinal evaluation,the method could be applied in various systems as well as different clinical settings in

关键词： In-patient medication order entry system Medication systems Nursing Time and motion studies

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Hepatocellular carcinoma masquerading as a bleeding gastric ulcer: A case report and a review of the surgical management

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World Journal of Gastroenterology 2007年第33期13卷 4523-4525页

作者： Johnny CA Ong Pierce KH Chow weng-Hoong Chan Alex YF Chung Choon Hua Thng Wai-Keong wong Department of General Surgery Singapore General Hospital Singapore 169608 Singapore Department of Oncologic Radiology National Cancer Centre Singapore Singapore

Hepatocellular Carcinoma (HCC) is a common malignancyworldwide. While bleeding from the gastrointestinal tract(BGIT) has a well known association with HCC, suchcases are mainly due to gastric and esophageal *** as a result of invasion of the gastrointestinal tractby HCC is extremely rare and is reportedly associatedwith very poor prognosis. We describe a 67-year-oldmale who presented with BGIT. Endoscopy showed thesite of bleeding to be from a gastric ulcer, but endoscopictherapy failed to control the bleeding and emergencysurgery was required. At surgery, the ulcer was found tohave arisen from direct invasion of the gastrointestinaltract by HCC of the left lobe. Control of the bleedingwas achieved by surgical resection of the HCC en-bloc with the lesser curve of the stomach. The patientremains alive 33 mo after surgery. Direct invasion of thegastrointestinal tract by HCC giving rise to BGIT is veryuncommon. Surgical resection may offer significantlybetter survival over non-surgical therapy, especially if thepatient is a good surgical candidate and has adequatefunctional liver reserves. Prognosis is not uniformly grave.

关键词： Hepatocellular carcinoma Gastrointestinal bleeding Stomach invasion Hepatectomy

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An unusual case of hypereosinophilic syndrome and disseminated intravascular coagulation

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Chinese Medical Journal 2005年第18期118卷 1582-1584页

作者： YEUNG Tok-fai LAU Siu-wah wong kin Department of Medicine and Geriatrics Our Lady of Maryknoll Hospital Hong Kong ChinaDepartment of Medicine and Geriatrics Our Lady of Maryknoll Hospital Hong Kong China Department of Medicine and Geriatrics Our Lady of Maryknoll Hospital Hong Kong China

Idiopathic hypereosinophilic syndrome （HES） is a heterogeneous disorder characterized by hypereosinophilia and organ damage which affects men more commonly than women （9：1）. The disease can be detected incidentally, but more often presents either insidiously or acutely with cardiac, neurological, cutaneous, pulmonary or gastro- intestinal manifestations, with cardiac involvement being a major cause of morbidity and morality in patients. 1.2 Although a major mechanism of tissue damage in HES is due to thromboembolism,3 fullblown disseminated intravascular coagulation （DIC） is apparently rare. This paper describes a man who presented acutely with life-threatening DIC complicating HES and its management, the first Chinese case reported in the literature.

关键词： hypereosinophilic syndrome·disseminated intravascular syndrome·low molecular weight heparin

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Laparoscopic excision of Meckel's diverticulum in children:What is the current evidence?

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World Journal of Gastroenterology 2014年第41期20卷 15158-15163页

作者： kin Wai Edwin Chan Kim Hung Lee Hei Yi Vicky wong Siu Yan Bess Tsui Yuen Shan wong Kit Yi Kristine Pang Jennifer Wai Cheung Mou Yuk Him Tam Division of Paediatric Surgery and Paediatric Urology Department of SurgeryThe Prince of Wales HospitalThe Chinese University of Hong Kong

Complications aroused from Meckel’s diverticulum tend to developed in children. Children presented with abdominal pain, intestinal obstruction, intussusception or gastrointestinal bleeding may actually suffered from complicated Meckel’s diverticulum. With the advancement of minimally invasive surgery (MIS) in children, the use of laparoscopy in the diagnosis and subsequent laparoscopic excision of Meckel’s diverticulum has gained popularity. Recently, single incision laparoscopic surgery (SILS) has emerged as a new technique in minimally invasive surgery. This review offers the overview in the development of MIS in the management of children suffered from Meckel’s diverticulum. The current evidence in different laparoscopic techniques, including conventional laparoscopy, SILS, the use of special laparoscopic instruments, intracorporeal diverticulectomy and extracorporeal diverticulectomy in the management of Meckel’s diverticulum in children were revealed.

关键词： Laparoscopy Meckel’ s diverticulum Children

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Defects properties and vacancy diffusion in Cu_(2)MgSnS_(4)

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Journal of Semiconductors 2022年第2期43卷 47-53页

作者： kin Fai Tse Shengyuan Wang Man Hoi wong Junyi Zhu Department of Physics The Chinese University of Hong KongHong KongChina

Cu_(2)Mg_(Sn)S_(4)(CZTS)is a promising photovoltaic absorber material,however,efficiency is largely hindered by potential fluctuation and a band tailing problem due to the abundance of defect complexes and low formation energy of an intrinsic Cu_(Zn)*** to CZTS by group I,II,or IV element replacement to circumvent this challenge has grown research *** this work,using a hybrid(HSE06)functional,we demonstrated the qualitative similarity of defect thermodynamics and electronic properties in Cu_(2)Mg_(Sn)S_(4)(CMTS)to *** show Sn_(Mg)to be abundant when in Sn-and Cu-rich condition,which can be detrimental,while defect properties are largely similar to CZTS in Sn-and *** Sn-and Cu-poor chemic-al potential,there is a general increase in formation energy in most defects except Sn_(Mg),Cu_(Mg)remains as the main contribu-tion to p-type carriers,and Sn_(Mg)may be detrimental because of a deep defect level in the mid gap and the possibility of form-ing defect complex Sn_(Mg)+Mg_(Sn).Vacancy diffusion is studied using generalized gradient approximation,and we find similar va-cancy diffusion properties for Cu vacancy and lower diffusion barrier for Mg vacancy,which may reduce possible Cu-Mg dis-order in *** findings further confirm the feasibility of CMTS as an alternative absorber material to CZTS and suggest the possibility for tuning defect properties of CZTS,which is crucial for high photovoltaic performance.

关键词： CMTS CZTS defect hybrid functional diffusion

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空气悬架客车横向动力学建模和稳定性分析

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汽车工程 2022年第11期44卷 1746-1754页

作者：陈龙陈明孙晓强蔡英凤 Pak kin wong 吴子强江苏大学汽车工程研究院镇江212013 澳门大学机电工程系中国澳门999078 扬州市奥特瑞汽车电子科技有限公司扬州225299

针对特殊行驶工况下空气悬架客车横向动力学失稳现象的揭示问题,本文中提出一种系统非线性动力学建模和稳定性分析方法。为准确反映空气悬架客车横向动力学演化规律,建立了考虑空气弹簧和轮胎非线性力学特性的系统3自由度动力学模型。... 详细信息

针对特殊行驶工况下空气悬架客车横向动力学失稳现象的揭示问题,本文中提出一种系统非线性动力学建模和稳定性分析方法。为准确反映空气悬架客车横向动力学演化规律,建立了考虑空气弹簧和轮胎非线性力学特性的系统3自由度动力学模型。为实现复杂高维动力学系统的稳定性分析,首先基于中心流形理论对系统进行降维处理,而后对得到的约化系统进行定性性态分析,确定了系统满足鞍结分岔的充分必要条件。设置4种工况对空气悬架客车横向动力学系统在平衡点处的分岔行为进行了相平面分析,掌握了空气悬架客车在不同路面条件下随车速及前轮转角变化的横向动力学失稳演化规律,最后基于整车动力学进行仿真验证表明解析分析结果与仿真分析结果一致,证明本文提出的非线性稳定性分析方法有效可行。

关键词：空气悬架客车动力学建模横向稳定性鞍结分岔点

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轮胎非线性纵滑力学特性的分段仿射辨识建模方法

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西安交通大学学报 2021年第7期55卷 52-60页

作者：孙晓强胡伟伟吴鹏程 PAK kin wong 陈龙江苏大学汽车工程研究院江苏镇江212013 清华大学汽车安全与节能国家重点实验室北京100084 澳门大学机电工程系澳门999078

针对传统轮胎力学模型因形式复杂、参数拟合困难等而不便于进行车辆系统动力学控制设计的问题,提出一种基于数据驱动的轮胎纵滑力学特性分段仿射辨识建模方法。基于平板式轮胎动态特性试验台,准确获取了反映轮胎在3124、6530、8036、946... 详细信息

针对传统轮胎力学模型因形式复杂、参数拟合困难等而不便于进行车辆系统动力学控制设计的问题,提出一种基于数据驱动的轮胎纵滑力学特性分段仿射辨识建模方法。基于平板式轮胎动态特性试验台,准确获取了反映轮胎在3124、6530、8036、9468、11760 N等5个垂向载荷,胎压880 kPa,纵向滑移率变化范围为-1~0.5,以及峰值附着系数分别为0.34和0.77的两种路面条件下的非线性纵滑力学特性试验数据。在此基础上,对试验结果进行了分析,确定了轮胎纵向力与其主要影响因素间的一般映射关系,进而引入分段仿射辨识理论完成轮胎纵滑力学特性的有效辨识。辨识主要由试验数据聚类、仿射子模型参数估计以及分解面系数矩阵求解等3个环节组成,分别采用改进的K-means、最小二乘以及模糊加权近似支持向量机等算法进行实现,最终针对低附路面和高附路面分别获取了10个仿射子模型用于拟合轮胎非线性纵滑力学特性试验数据。为验证辨识轮胎模型的精度,将模型仿真结果与试验数据进行对比。结果表明,所辨识的轮胎模型能够准确描述轮胎非线性纵滑力学特性,模型整体拟合精度高于95%。

关键词：车辆轮胎纵滑力学特性非线性建模分段仿射辨识

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