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SYNTHESIS AND CHARACTERIZATION OF A SOLUBLE LADDERLIKE POLYSILSESQUIOXANE CONTAINING REACTIVE ESTER GROUPS

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Chinese Journal of Polymer Science 2001年第2期19卷 209-216页

作者：张榕本 Tai-shung chung PCLCC Center for Molecular Science Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China An abbreviation for Polymer Chemistry LaboratoryChinese Academy of Sciences and China Petro-Chemical Corporation Institute of Materials Research and Engineering National University of Singapore Singapore 119260

A novel soluble ladderlike polysilsesquioxane containing reactive ester groups (Ester-T) was synthesized for the first time by stepwise coupling polymerization including preammonolysis, controlled hydrolysis and polycondensation. The monomer, 3-trichlorosilylpropoxy 4-acetoxybenzoate (M), was synthesized by hydrosilylation of allyloxy 4-acetoxybenzoate with trichlorosilane in the presence of dicyclopentadienylplatinum (II) chloride (Cp2PtCl2) catalyst. Combination of FTIR, H-1-NMR, C-13-NMR, Si-29-NMR, XRD, DSC, TGA and VPO methods was used to demonstrate that the polymer obtained has an ordered ladderlike structure. The synthesized Ester-T may have promising applications as a precursor of advanced functional polymers.

关键词： ladderlike polysilsesquioxane stepwise coupling polymerization hydrosilylation characterization

CONVERGENCE OF NEWTON＇S METHOD FOR A MINIMIZATION PROBLEM IN IMPULSE NOISE REMOVAL

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Journal of Computational Mathematics 2004年第2期22卷 168-177页

作者： RaymondH.Chan chung-waHo MilaNikolova DepartmentofMathematics TheChineseUniversityofHongKongShatinHongKong CentredeMathématiquesetdeLeursApplications(CMLA-CNRSUMR8536) ENSdeCachan61av.duPresidentWilson94235CachanCedexFrance

Recently, two-phase schemes for removing salt-and-pepper and random-valued impulse noise are proposed in [6, 7]. The first phase uses decision-based median filters to locate those pixels which are likely to be corrupted by noise (noise candidates). In the second phase, these noise candidates are restored using a detail-preserving regularization method which allows edges and noise-free pixels to be preserved. As shown in [18], this phase is equivalent to solving a one-dimensional nonlinear equation for each noise *** can solve these equations by using Newton's method. However, because of the edgepreserving term, the domain of convergence of Newton's method will be very narrow. In this paper, we determine the initial guesses for these equations such that Newton's method will always converge.

关键词： Impulse noise denoising Newton's method Variational method

Autocompletion of repetitive stroking with image guidance

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Computational Visual Media 2023年第3期9卷 581-596页

作者： Yilan Chen Kin chung Kwan Hongbo Fu School of Creative Media City University of Hong KongTat Chee AvenueKowloonHong Kong SARChina University of Konstanz University Street 1078464 KonstanzGermany

Image-guided drawing can compensate for a lack of skill but often requires a significant number of repetitive strokes to create *** automatic stroke synthesis methods are usually limited to predefined styles or require indirect manipulation that may break the spontaneous flow of *** present an assisted drawing system to autocomplete repetitive short strokes during a user's normal drawing *** draw over a reference image as usual;at the same time,our system silently analyzes the input strokes and the reference to infer strokes that follow the user's input style when certain repetition is *** can accept,modify,or ignore the system's predictions and continue drawing,thus maintaining fluid control over *** key idea is to jointly analyze image regions and user input history to detect and predict *** proposed system can effectively reduce the user's workload when drawing repetitive short strokes,helping users to create results with rich patterns.

关键词： interaction autocompletion digital drawing prediction texture synthesis

Microarray analysis of PBMC after Plasmodium falciparum infection:molecular insights into disease pathogenesis

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Asian Pacific Journal of Tropical Medicine 2016年第4期9卷 306-315页

作者： Wan-chung Hu Department of International Health.Johns Hopkins University School of Public Health:Division of Clinical Chinese Medicine National Research Institute of Chinese Medicine

Objective:To find out host gene expression profiles after malarial ***:Further time-course microarray analysis of peripheral blood mononuclear cells focusing on malaria pathogenesis was ***:Up-rcgulation of coagulation-related genes,heal shock proteins,glycolytic enzymes,glucose transporters,and vacuolar H^+-ATPascs was found in acute febrile *** early malaria,prior to detectable parasitemia,CD36 and ICAM1 were *** acute malaria,there is correlation between IL-1β and heal shock ***163,a hemoglobin scavenger receptor,was up-regulated in acute malaria to potentially facilitate free hemoglobin up-takc by *** acute malaria,high MafB gene expression was negatively correlated with hemoglobin and platelet *** with hemoglobin down-regulation,peripheral red blood cell counts tended to increase during acute ***-regulations of red blood cell and leucocyte binding mediators like ***1,thrombospondin and thrombomodulin may contribute to the pathogenesis of cerebral ***,up-regulation of correlated glycolytic enzymes,glucose transporter and H^+-ATPases may contribute to the hypoglycemia and metabolic acidosis frequently observed in serious malaria *** gender effects on gene expression profiles between male and female were not apparent,except for some hemoglobins were significantly downregulated in male versus female,which suggesting males are prone to malaria-related ***:Leucocyte gene expression profiles can explain the pathogenesis of malarial complication such as fever,metabolic acidosis,hypoglycemia,anemia,and coagulopathy.

关键词： Cerebral malaria Metabolic acidosis Anemia Coagulopathy Hypoglycemia Fever

Application of an aerosol electrical mobility spectrum analyzer: Charged-particle polarity ratio measurement in the Antarctic and Arctic regions

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Journal of Environmental Sciences 2021年第7期33卷 81-89页

作者： Handol Lee Hyeok chung Kang-Ho Ahn Department of Environmental Engineering Inha University100 Inha-roMichuhol-guIncheon 22212South Korea Aerosol Research and Technology Plus(ART+) 195-62Daepyeong-roDaewol-myeonIcheonGyunggi-do 17343South Korea Department of Mechanical Engineering Hanyang UniversityERICA55 Hanyangdaehak-roSangnok-guAnsan 15588South Korea

An aerosol electrical mobility spectrum analyzer(AEMSA),developed at Hanyang University,was employed to investigate the particle charge characteristics in the Antarctic and Arctic *** particle charge characteristics in these areas were compared with the charging state in Ansan,South Korea,located in the midlatitude,where artificial factors,such as human activity,urbanization,and traffic,might result in a higher total ***,in Ansan,South Korea,the charged-particle polarity ratio was very stable and was close to ***,notably different particle charge characteristics were obtained in the Antarctic and Arctic *** imbalance between the numbers of positively and negatively charged particles was evident,resulting in more positive charges on the atmospheric *** average,the positively charged particle concentrations in the Antarctic and Arctic areas were 1.4 and 2.8 times higher,respectively,compared with the negatively charged *** developed AEMSA system and the findings of this study provide useful information on the characteristics of atmospheric aerosols in the Antarctic and Arctic regions and can be further utilized to study particle formation mechanisms.

关键词： Aerosol electrical mobility spectrum analyzer Antarctic Arctic Charged-particle polarity ratio

Ensemble Wind Power Prediction Interval with Optimal Reserve Requirement

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 65-76页

作者： Hamid Rezaie Cheuk Hei chung Nima Safari the Saskatchewan Power Corporation(SaskPower) ReginaSaskatchewanCanada the Department of Electrical and Computer Engineering and Department of Human Biology University of TorontoTorontoON M5S 3G4Canada the Alberta Electric System Operator(AESO) CalgaryAlbertaCanada

Wind power prediction interval(WPPI)models in the literature have predominantly been developed for and tested on specific case ***,wind behavior and characteristics can vary significantly across ***,a prediction model that performs well in one case might underperform in *** address this shortcoming,this paper proposes an ensemble WPPI framework that integrates multiple WPPI models with distinct characteristics to improve *** important and often overlooked factor is the role of probabilistic wind power prediction(WPP)in quantifying wind power uncertainty,which should be handled by operating *** reserve in WPPI frameworks enhances the efficacy of *** this regard,the proposed framework employs a novel bi-layer optimization approach that takes both WPPI quality and reserve requirements into *** analysis with different real-world datasets and various benchmark models validates the quality of the obtained WPPIs while resulting in more optimal reserve requirements.

关键词： Ensemble model linear programming operating reserve optimal reserve requirement prediction interval probabilistic prediction renewable integration uncertainty representation wind power prediction(WPP)

Identification of the 2l2l′nl ″^(2)P^(0) Hollow Lithium Systems

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Chinese Physics Letters 1998年第5期15卷 332-334页

作者： Kwong T.chung GOU Bing-cong Department of Physics North Carolina State UniversityRaleighNC 27695-8202U.S.A Department of Applied Physics Beijing Institute of TechnologyBeijing 100081

In a recent letter[*** et al.,***.76,30(1996)],first experimental determination of the partial photoionization cross sections of lithium near the hollow atomic states was *** extensive R-matrix calculation has also been carried out for the 2l2l′nl ″^(2)P^(0) hollow states and assignments for the excited states have been ***,these assignments are substantially different from those of other theoretical *** points out the need for more information and discussion which are necessary for a meaningful comparison.

关键词： methods. assignment states

Optimal design theories of tuned mass dampers with nonlinear viscous damping

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Earthquake Engineering and Engineering Vibration 2009年第4期8卷 547-560页

作者： Lap-Loi chung Lai-Yun Wu Hsu-Hui Huang chung-Hsin Chang Kuan-Hua Lien Center for Research on Earthquake Engineering （NCREE） Chinese Taipei Department of Civil Engineering Taiwan University. Chinese Taipei

Optimal design theory for linear tuned mass dampers （TMD） has been thoroughly investigated, but is still under development for nonlinear TMDs. In this paper, optimization procedures in the time domain are proposed for design of a TMD with nonlinear viscous damping. A dynamic analysis of a structure implemented with a nonlinear TMD is conducted first. Optimum design parameters for the nonlinear TMD are searched using an optimization method to minimize the performance index. The feasibility of the proposed optimization method is illustrated numerically by using the Taipei 101 structure implemented with TMD. The sensitivity analysis shows that the performance index is less sensitive to the damping coefficient than to the frequency ratio. Time history analysis is conducted using the Taipei 101 structure implemented with different TMDs under wind excitation. For both linear and nonlinear TMDs, the comfort requirements for building occupants are satisfied as long as the TMD is properly designed. It was found that as the damping exponent increases, the relative displacement of the TMD decreases but the damping force increases.

关键词： optimal design theory tuned mass damper (TMD) nonlinear performance index sensitivity analysis Taipei 101

Self-sensing concrete:from resistance-based sensing to capacitance-based sensing

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International Journal of Smart and Nano Materials 2021年第1期12卷 1-19页

作者： D.D.L.chung Composite Materials Research Laboratory Department of Mechanical and Aerospace EngineeringUniversity at Buffalothe State University of New YorkBuffaloNYUSA

Self-sensing uses the cement-based material without sensor incor-poration to sense *** paper reviews self-sensing cementbased materials,with coverage of the well-studied resistance-based sensing as well as the less-studied capacitance-based *** review is the first that covers capacitance-based ***-based sensing is advantageous over resistance-based sensing in that no particular admixture is required,so that it is applicable to both existing and new *** contrast,resis-tancebased sensing that is comparable to capacitance-based sen-sing in stress/strain sensitivity requires conductive admixtures,such as carbon ***-based strain sensing is based on piezo-resistivity,which is associated with the resistance increasing upon tension and decreasing upon ***-based strain sensing is based on piezopermittivity,which is associated with the permittivity decreasing upon tension and increasing upon *** causes the resistance to increase and causes the permittivity to *** in temperature decreases the resistance but increases the *** review also covers the methodology of the electrical measurements.

关键词： Cement concrete sensing resistance capacitance