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Online hybrid test using a finite element program and an explicit integration scheme

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Science China(Technological Sciences) 2015年第1期58卷 163-173页

作者： Alexandre lam PAN Peng DENG KaiLai Department of Civil Engineering Tsinghua University Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry Department of Civil Engineering Tsinghua University

A new online hybrid test system combined with substructuring techniques and incorporating finite element methods is *** the proposed system,numerical substructure analysis is conducted by ABAQUS/*** ABAQUS user subroutine is used as the interface between the main control program and ABAQUS to impose the target displacements and determine the reaction *** iteration is needed in this system,making it suitable for physical *** the approach also avoids the need to modify source code,it will be appealing to a number of real engineering *** proposed system adopts a separated-model framework,operator-splitting integration scheme,and data exchange through a socket *** earthquake responses of a simple steel moment-resisting frame are simulated,and the results obtained from the new system are compared to those obtained from the conventional *** is found that the results obtained from the new system are accurate,demonstrating the applicability and efficiency of the proposed *** optimal test parameters are also studied to gain the most accurate results in the minimum time.

关键词： online hybrid test substructuring ABAQUS/Explicit separated-model framework operator-splitting method

Liouvillian Solutions of Algebraic Ordinary Differential Equations of Order One of Genus Zero

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Journal of Systems Science & Complexity 2023年第2期36卷 884-893页

作者： NGUYEN Tri Dat NGO lam Xuan Chau Faculty of Basic Science Ho Chi Minh City University of TransportHo Chi Minh CityVietnam Department of Mathematics and Statistics Quy Nhon UniversityQuy Nhon CityVietnam

This paper considers the class of autonomous algebraic ordinary differential equations(AODEs)of order one,and studies their Liouvillian general *** particular,let F(y,w)=0 be a rational algebraic curve over *** authors give necessary and sufficient conditions for the autonomous first-order AODE F(y,y′)=0 to have a Liouvillian solution over ***,the authors show that a Liouvillian solutionαof this equation is either an algebraic function over C(x)or an algebraic function over C(exp(ax)).As a byproduct,these results lead to an algorithm for determining a Liouvillian general solution of an autonomous AODE of order one of genus *** parametrizations of rational algebraic curves play an important role on this method.

关键词： Algebraic ordinary differential equation autonomous differential equation Liouvillian solution rational algebraic curve rational parametrizations

Building an e-Portfolio with a learning plan centric approach

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Journal of Zhejiang University-Science C(Computers and Electronics) 2012年第1期13卷 37-47页

作者： lam-for KWOK Ka-shing CHAN Department of Computer Science City University of Hong Kong

A portfolio records achievements in the personal growth process. A personal development e-Portfolio assists an individual in planning his/her development path and reflecting upon his/her own learning. In this article, we propose an approach to constructing a personal development portfolio. An abstract information model is presented to support such a portfolio. The information model is proposed based upon and according to IMS standards. The use of this approach is illustrated by way of a prototype e-Portfolio system. The usage scenario and limitations of such a portfolio are also discussed.

关键词： E-Portfolio Educational technology system Lifelong learning

Acupuncture improves cognitive function A systematic review

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Neural Regeneration Research 2013年第18期8卷 1673-1684页

作者： Mason Chin Pang Leung Ka keung Yip Chung Tsung lam Ka Shun lam Wai Lau Wing lam Yu Amethyst King Man Leung Kwok-fai So Department of Rehabilitation Sciences the Hong Kong Polytechnic University Cambridge Regional College Department of Anatomy and the State Key Laboratory of Brain and Cognitive Science the University of Hong Kong Pokfulam Hong Kong Special Administrative Region China GHM Institute of CNS Regeneration Jinan University

BACKGROUND： Acupuncture has been used as a treatment for cognitive impairment. OBJECTIVE： This review assesses clinical evidence for or against acupuncture as a treatment for cognitive impairment. This review also discusses the proposed mechanism（s） that could link acupuncture to improved cognitive function. METHODS： We searched the literature using PolyUone search from its inception to January 2013, with full text available and language limited to English. Levels of evidence were examined using Oxford Centre for Evidence-based Medicine-Levels of Evidence （March, 2009）. RESULTS： Twelve studies met the inclusion criteria： 3 human studies and 9 animal studies. Levels of evidence ranged from level lb to level 5. CONCLUSION： Most animal studies demonstrated a positive effect of acupuncture on cognitive impairment. However, the results of human studies were inconsistent. Further high-quality human studies with greater statistical power are needed to determine the effectiveness of acupuncture and an optimal protocol.

关键词： neural regeneration dementia acupuncture electroacupuncture learning cognitive cognition memory neuroregeneration

Cardioprotection of HAX-1 against ischemia reperfusion injury through both mitochondrial and ER-stress mediated cell death pathways

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中国病理生理杂志 2012年第11期 2019-2019页

作者： Chi keung lam Evangelia G.KRANIAS University of Cincinnati College of Medicine CincinnatiOhio 45267-0575USA

AIM:Our previous studies demonstrated that an anti-apoptotic protein,HS-1-associated protein X-1(HAX-1),regulatedcardiac contractility through interaction with phospholamban and sarcoplasmic reticulum(SR)calcium ATPas... 详细信息

关键词： ER Cardioprotection of HAX-1 against ischemia reperfusion injury through both mitochondrial and ER-stress mediated cell death pathways cell

Sea Nine 211 as antifouling biocide: A coastal pollutant of emerging concern

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Journal of Environmental Sciences 2017年第11期29卷 68-79页

作者： Lianguo Chen James C.W.lam State Key Laboratory in Marine Pollution City University of Hong Kong Department of Science and Environmental Studies The Education University of Hong Kong

Sea Nine 211, with 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one（DCOIT） being the biocidal ingredient, is a widely-used antifouling agent to deter the undesirable biofouling phenomenon. It is commercially promoted as an environmentally acceptable antifoulant mainly due to its claimed rapid degradation in marine environment. However, increasing researches document varying degradative kinetics in different environments, proving that Sea Nine 211 is actually not degraded equally fast around the world（half-life between〈 1 day and 13.1 days）. Large-scale application of Sea Nine 211 in antifouling coatings has also caused global contamination of marine environment in various compartments. For example, accumulation of Sea Nine 211 is detected as high as 3700 ng/L in Spanish seawater and 281 ng/g dry weight in Korean sediment. Considering that Sea Nine 211 is highly toxic against non-target marine organisms, environmental risk assessment finds that most marine organisms are endangered by Sea Nine 211 in worst-case scenario. Its endocrine disrupting and reproductive impairing effects at environmentally worst-case concentrations further constitute a long-term threat to the maintenance of population ***, in the light of the varying degradability, environmental pollution and high toxicity, especially the endocrine disruption, Sea Nine 211 as an antifouling agent is likely to cause non-negligible damages to the marine ecosystem. There is an urgency to perform a systematic ecological risk assessment of Sea Nine 211 to prevent the potential impacts on the health of marine environment. A regular monitoring also becomes necessary to place the usage of antifouling biocides under control.

关键词： Sea Nine 211 Antifouling agent Degradation Environmental occurrences Ecological risks Endocrine disruption

Fully covered metal biliary stents: A review of the literature

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World Journal of Gastroenterology 2021年第38期27卷 6357-6373页

作者： Robert lam Thiruvengadam Muniraj Department of Medicine Yale University School of MedicineNew HavenCT 06520United States

Fully covered self-expandable metal stents(FCSEMS)represent the latest advancement of metal biliary stents used to endoscopically treat a variety of obstructive biliary pathology.A large stent diameter and synthetic covering over the tubular mesh prolong stent patency and reduce risk for tissue hyperplasia and tumor ***,FCSEMS can be easily *** these features address issues faced by plastic and uncovered metal *** purpose of this paper is to comprehensively review the application of FCSEMS in benign and malignant biliary strictures,biliary leak,and post-sphincterotomy bleeding.

关键词： Fully covered self-expandable metal stents Plastic stents Endoscopy Chronic pancreatitis Biliary stricture Biliary leak Stent migration

Application of physics-informed neural network in the analysis of hydrodynamic lubrication

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Friction 2023年第7期11卷 1253-1264页

作者： Yang ZHAO Liang GUO Patrick Pat lam WONG School of Automotive and Transportation Engineering Shenzhen PolytechnicShenzhen 518055China School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200444China Department of Mechanical Engineering City University of Hong KongHong KongChina

The last decade has witnessed a surge of interest in artificial neural network in many different areas of scientific *** the rapid expansion in the application of neural networks,few efforts have been carried out to introduce such a powerful tool into lubrication ***,this work aims to apply the physics-informed neural network(PINN)to the hydrodynamic lubrication *** 2D Reynolds equation is *** PINN is a meshless method and does not require big data for network training compared with classical *** results are consistent with those obtained by experiments and the finite element ***,we envision that the PINN method will have great application potential in lubrication and bearing research.

关键词： physics-informed neural network hydrodynamic lubrication slider bearing

Non-conventional modeling of extreme significant wave height through random sets

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Acta Oceanologica Sinica 2014年第7期33卷 125-130页

作者： ZHANG Yi lam Jasmine Siu Lee Division of Infrastructure Systems and Maritime Studies School of Civil and Environmental EngineeringN1-B1a-25 Nanyang Technological UniversitySingapore Division of Infrastructure Systems and Maritime Studies School of Civil and Environmental EngineeringN1-01b-43 Nanyang Technological UniversitySingapore

The analysis and design of offshore structures necessitates the consideration of wave loads. Realistic modeling of wave loads is particularly important to ensure reliable performance of these structures. Among the available methods for the modeling of the extreme significant wave height on a statistical basis, the peak over threshold method has attracted most attention. This method employs Poisson process to character- ize time-varying properties in the parameters of an extreme value distribution. In this paper, the peak over threshold method is reviewed and extended to account for subjectivity in the modeling. The freedom in selecting the threshold and the time span to separate extremes from the original time series data is incorpo- rated as imprecision in the model. This leads to an extension from random variables to random sets in the probabilistic model for the extreme significant wave height. The extended model is also applied to different periods of the sampled data to evaluate the significance of the climatic conditions on the uncertainties of the parameters.

关键词： offshore engineering extreme value distribution wave height peak over threshold randomset Pareto distribution