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Chinese Journal of Mechanical Engineering 2007年第5期20卷 80-86页

作者： WONG Pak-kin tam lap-mou LI Ke Department of Electromechanical Engineering Faculty of Science and Technology University of Macao Macao China

In modem four-stroke engine technology, variable valve timing and lift control offers potential benefits for making a high-performance engine. A novel electro-hydraulic fully variable valve train for four-stroke automotive engines is introduced. The construction of the nonlinear mathematic model of the valve train system and its dynamic analysis are also presented. Experimental and simulation results show that the novel electro-hydraulic valve train can achieve fully variable valve timing and lift control. Consequently the engine performance on different loads and speeds will be significantly increased. The technology also permits the elimination of the traditional throttle valve in the gasoline engines and increases engine design flexibility.

关键词： Fully variable engine valve train Dynamic model Simulation

Ignition Pattern Analysis for Automotive Engine Trouble Diagnosis Using Wavelet Packet Transform and Support Vector Machines

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Chinese Journal of Mechanical Engineering 2011年第5期24卷 870-878页

作者： VONG Chi-man WONG Pak-kin tam lap-mou ZHANG Zaiyong Department of Computer and Information Science Faculty of Science and Technology University of Macao Macao China Department of Electromechanical Engineering Faculty of Science and Technology University of Macao Macao China

Engine spark ignition is an important source for diagnosis of engine *** on the waveform of the ignition pattern,a mechanic can guess what may be the potential malfunctioning parts of an engine with his/her experience and ***,this manual diagnostic method is imprecise because many spark ignition patterns are very ***,a diagnosis needs many trials to identify the malfunctioning *** the mechanic needs to disassemble and assemble the engine parts for *** tackle this problem,an intelligent diagnosis system was established based on ignition ***,the captured patterns were normalized and *** wavelet packet transform（WPT） was employed to extract the representative features of the ignition ***,a classification system was constructed by using multi-class support vector machines（SVM） and the extracted *** classification system can intelligently classify the most likely engine fault so as to reduce the number of diagnosis *** results show that SVM produces higher diagnosis accuracy than the traditional multilayer feedforward neural *** is the first trial on the combination of WPT and SVM to analyze ignition patterns and diagnose automotive engines.

关键词： automotive engine ignition pattern diagnosis pattern classification wavelet packet transform support vector machines.

新型四冲程发动机液压可变配气机构的动态仿真与分析

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汽车工程 2006年第8期28卷 725-728,746页

作者：王百键李科谭立武澳门大学科技学院

提出一种新型的四冲程发动机液压可变配气机构。建立系统非线性数学模型,并分析配气机构的动态特性。仿真和试验结果表明,新的液压配气机构能实现可变气门正时及开度的控制,可适用于高转速发动机,具有一定的实用性。

关键词：全可变配气机构非线性模型仿真

Microbiologically Influenced Corrosion Behavior of Fe_(40)(CoCrMnNi)_(60) and Fe_(60)(CoCrMnNi)_(40) Medium Entropy Alloys in the Presence of Pseudomonas Aeruginosa

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Acta Metallurgica Sinica(English Letters) 2023年第3期36卷 379-390页

作者： Weiwei Chang Yangyang Li Huaibei Zheng Hongchang Qian Dawei Guo Shuyuan Zhang Yuntian Lou Chi Tat Kwok lap mou tam Dawei Zhang National Materials Corrosion and Protection Data Center Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China BRI Southeast Asia Network for Corrosion and Protection(MOE) Shunde Graduate School of University of Science and Technology BeijingFoshan 528399China State Key Laboratory of Metal Material for Marine Equipment and Application Anshan 114002China Department of Electromechanical Engineering University of MacaoMacao 999078China Institute for the Development and Quality Macao 999078China

In this work,the microbiologically influenced corrosion(MIC)of Fe_(40)(CoCrMnNi)_(60) and Fe_(60)(CoCrMnNi)_(40) medium entropy alloys(MEAs)induced by Pseudomonas aeruginosa(***)was *** behaviors during 14 days of immersion in sterile and ***-inoculated culture media are *** sterile conditions,both MEAs exhibited good corrosion resistance against the culture medium *** the presence of ***,the pitting corrosion of MEAs was *** results of inductively coupled plasma‒mass spectrometry(ICP‒MS)and potentiodynamic polarization tests showed that the presence of *** promoted the selective dissolution of passive film and accelerated the corrosion of *** results of X-ray photoelectron spectroscopy(XPS)and Mott-Schottky measurements further demonstrated the degradation effect of *** on the passive *** with Fe_(60)(CoCrMnNi)_(40),Fe_(40)(CoCrMnNi)_(60) manifested better resistance to the MIC caused by ***,which may be attributed to more Cr oxides and fewer Fe oxides of the passive film.

关键词： Microbiologically influenced corrosion Medium entropy alloys Pseudomonas aeruginosa

Colonoscopy in Hong Kong Chinese children

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World Journal of Gastroenterology 2010年第9期16卷 1119-1122页

作者： Yuk Him tam Kim Hung Lee Kin Wai Chan Jennifer Dart Yin Sihoe Sing Tak Cheung Jennifer Wai Cheung mou Division of Paediatric Surgery & Paediatric Urology Department of SurgeryPrince of Wales HospitalThe Chinese University of Hong Kong

AIM:To investigate the safety and diagnostic yield of colonoscopy in Chinese children in whom the procedure is not often ***:We conducted a retrospective review of all colonoscopies in consecutive children who underwent their fi rst diagnostic colonoscopy from Jan 2003 to ***:Seventy-nine children (48 boys,31 girls;mean age 9.2 ± 4.2 years) were identified and reviewed with a total of 82 colonoscopies *** caecal and ileal intubation rates were 97.6% and 75.6% *** patients (50.6%) had a positive diagnosis made in colonoscopy and that included colonic polyps (23),Crohn's disease (12),ulcerative colitis (1),and miscellaneous causes (4).80% of polyps were in the rectosigmoid *** but one were juvenile hamartomatous *** exceptionwas an adenomatous *** mean ages for children with inflammatory bowel disease (IBD) and polyps were 11.3 and 4.3 years *** was no procedure-related ***:Colonoscopy is a safe procedure in our Chinese *** increasing diagnosis of IBD in recent decades may reflect a rising incidence of the disease in our children.

关键词： Colonoscopy Children Inflammatory bowel disease Colonic polyps

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

Cystic meconium peritonitis with jejunoileal atresia:Is it associated with unfavorable outcome?

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World Journal of Clinical Pediatrics 2017年第1期6卷 40-44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

AIM To compare the outcome between patients with jejunoileal atresia(JIA) associated with cystic meconium peritonitis(CMP) and patients with isolated JIA(JIA without CMP).METHODS A retrospective study was conducted for all neonates with JIA operated in our institute from January 2005 to January *** including the gestation age,sex,birth weight,age at operation,the presence of associated syndrome was *** outcome including the type of operation performed,operative time,the need for reoperation and mortality were *** demographics and the outcome between the 2 groups were *** During the study period,53 neonates had JIA underwent operation in our *** neonates(32%) were associated with *** was no statistical difference on the demographics in the two *** with CMP had earlier operation than patients with isolated JIA(mean 1.4 d vs 3 d,P = 0.038).Primaryanastomosis was performed in 16 patients(94%) with CMP and 30 patients(83%) with isolated JIA(P = 0.269).Patients with CMP had longer operation(mean 190 min vs 154 min,P = 0.004).There were no statistical difference the need for reoperation(3 vs 6,P = 0.606) and mortality(2 vs 1,P = 0.269) between the two *** Primary intestinal anastomosis can be performed in94% of patients with JIA associated with *** patients with CMP had longer operative time,the mortality and reoperation rates were low and were comparable to patients with isolated JIA.

关键词： Meconium Peritonitis Atresia Jejunoileal

Use of laparoscopy as the initial surgical approach of impalpable testes:10-year experience

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World Journal of Clinical Pediatrics 2015年第4期4卷 155-159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

AIM: To review the experience in the management of impalpable testes using laparoscopy as the initial approach and the need for inguinal ***: From January 2004 to June 2014, 339 patients with undescended testes underwent operation in our institute. Fifty patients(15%) had impalpable testes. All children with impalpable testes underwent initial laparoscopy. A retrospective review was conducted on this group of patients and the outcome was ***: Forty children had unilateral impalpable testis. Ten children had bilateral impalpable testes. Thirty-one children(78%) in the unilateral group underwent subsequent inguinal exploration while 4 children(40%) in the bilateral group underwent inguinal exploration(P laparoscopy in children with impalpable testes is a safe procedure and can guide the need for subsequent inguinal exploration. Children with unilateral impalpable testis were associated with an increased need for inguinal exploration after laparoscopy. Orchidopexies could be performed successfully in 90% of children with bilateral impalpable testes.

关键词： laparoscopy Impalpable Testis Inguinal

Effect of ambient air pollution on daily mortality rates in Guangzhou,China

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Effect of ambient air pollution on daily mortality rates in ...

2011广东省预防医学会学术年会

作者： Ignatius Tak Sun Yu Yong hui Zhang Wilson Wai San tam Qing Hua Yan Yan jun Xu Xiao jun Xun Wei Wu Wen Jun Ma Lin Wei Tian lap Ah Tse Xiang Qian Lao School of Public Health and Primary Care Faculty of MedicineThe Chinese University of Hong Kong Center for Disease Control and Prevention of Guangdong Province

We aimed to investigate the effects of ambient air pollutants on daily mortality in a relatively stable and homogeneous population in Guangzhou,*** mortality,air pollution,and weather data between 2006 and 2009 were *** generalized additive model with poison regression was used to estimate the excessive risks(ERs) of air pollutants(PM,*** NO) on total,cardiovascular and respiratory *** effects of lagO-1 were the greatest for total non-accidental and cardiovascular *** increments of 10μg m in ***,and PM were associated with ERs of 1.54%(95%CI: 1.03-2.06%).1.42%(95%CI:1.06-1.78%),and 1.26%(95%CI:0.86-1.66%) respectively for total non-accidental deaths,and 2.28%(95%CI:1.40-3.16%),1.81%(95%CI:1.20-2.41%).and 1.79%(95%CI:1.11-2.47%) respectively for cardiovascular *** persons who died from respiratory disease,however,the maximum effects occurred at *** ERs for SO,NO,and PM were 1.36%(95%CI:0.23-2.50%),1.47% (95%CI:0.66-2.29%) and 0.93%(95%CI:0.03-1.83%).*** effects of the three air pollutants on mortality were stronger in elderly and in *** ERs in the present study were higher than those reported in *** U.S..and most other Asian *** findings show relatively higher ERs of daily mortality by ambient air pollutants in the center of Guangzhou,China,compared with estimates in other *** studies with accurate exposure measurement among homogeneous population are needed to evaluate the precise magnitudes of the effects of the air pollutants.

关键词： Ambient air pollution Daily mortality Chinese

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矽肺对肺癌及总死亡影响的回顾性队列研究

中华劳动卫生职业病杂志 2008年第1期26卷 29-33页

作者：余德新谢立亚梁子超黄子惠谭卓明陈志权香港中文大学社区及家庭医学系香港卫生署肺尘埃沉着病诊所

目的利用香港矽肺患者队列的资料进行分析，探讨矽尘、矽肺与肺癌的关系。方法选择1981年1月113至1998年12月31日期间在香港尘肺诊所登记的2789例男性矽肺病例为研究对象，取用同时期一般男性人群作为对照。用人年的方法估计各死因的标... 详细信息

目的利用香港矽肺患者队列的资料进行分析，探讨矽尘、矽肺与肺癌的关系。方法选择1981年1月113至1998年12月31日期间在香港尘肺诊所登记的2789例男性矽肺病例为研究对象，取用同时期一般男性人群作为对照。用人年的方法估计各死因的标化死亡比（SMR），用Axelson’s法间接调整吸烟的混杂影响。矽尘与肺癌的剂量-效应关系采用多因素p-spline平滑法模型来拟合最佳风险模型。结果该组研究队列人数为2789，共观察24992．6人年，失访率仅为2．9％。该队列主要工种为建筑工人（51．09％）和地下沉箱操作工人（37．54％）。队列总死亡人数为853人，平均死亡年龄为（63．8±10．27）岁，整个队列中86例死于肺癌。全死因及全癌的SMR均明显上升，首位死因是呼吸道疾病，肺癌的SMR明显增加（SMR：1．69，95％CI：1．35～2．09）。去除年龄、时期和吸烟的混杂因素的影响，矽肺对肺癌的相对危险度下降到1．12（95％CI：0．89～1．38）。间接调整吸烟的混杂影响后建筑工人及地下沉箱工人肺癌的相对危险度分别为1．09（95％CI：0．82～1．42）和1．56（0．98～2．36）。多因素p-spline平滑法风险模型分析显示，肺癌与累积呼吸性矽尘总量或平均矽尘浓度的关系无剂量-效应关系。结论队列研究未发现接触矽尘或矽肺能增加肺癌死亡的危险，平滑法模型拟合的风险模型并不支持矽尘与肺癌死亡之间存在剂量-效应关系。

关键词：矽肺肺肿瘤死亡率队列研究