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Journal of Natural Gas chemistry 2008年第3期17卷 232-237页

作者： y. H. Taufiq-yap y.c. wong y. Kamiya W.J. Tang Putra center for catalysis Science and Technology Department of Chemistry Faculty of Science Universiti Putra Malaysia 43400 UPM Serdang Selangor Darul Ehsan Malaysia Graduate School of Environmental Science Hokkaido Universit3 Sapporo 060-0810 Japan

Three Bi-doped vanadyl pyrophosphate catalysts were prepared via dihydrate route （VPD method）, which consisted of different preparation methods including mechanosynthesis, mechanochemical treatment, and the conventional reflux method. The catalysts produced by the above three methods were characterized by x-ray diffraction （XRD）, scanning electron microscopy （SEM）, and temperature programmed reduction （TPR）. catalytic evaluation for the partial oxidation of n-butane to maleic anhydride （MA） was also carried out. The XRD patterns of all the Bi-doped catalysts showed the main peaks of pyrophosphate phase. Lower intensity peaks were observed for the mechanochemically treated Bi-doped catalyst （VPDBiMill） with two additional small peaks corresponding to the presence of a small amount of V5＋ phase. The TPR profiles showed that the highest amount of active oxygen species, i.e, V4＋–O- pair, responsible for n-butane activation, was removed from VPDBiMill. Furthermore, from the catalytic test results, the graph of selectivity to MA as a function of the conversion of n-butane demonstrated that VPDBiMill was the most selective catalyst. This suggests that the mechanochemical treatment of vanadium phosphate catalyst （VPDBiMill） is a potential method to improve the catalytic properties for the partial oxidation of n-butane to maleic anhydride.

关键词： mechanosynthesis mechanochemical treatment bismuth vanadyl pyrophosphate

Asymptotic Properties of a Modified Semi-Parametric MLE in Linear Regression with Right-censored Data

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Acta Mathematica Sinica,English Series 2002年第2期18卷 405-416页

作者： wong George y.c. Strang cancer Prevention center.428 E 72nd Street.New york.Ny 10021.USA

consider a linear regression model y=β'X+*** y may be right censored and the cdf F+o of e is *** show that a modified semi-parametric *** by .is strongly.c.nsistent under certain regularity *** F_o is discontinuous,then P(≠βi.o.)=0, which means that P(=βif the sample size is large)=*** latter property has not been reported for the existing *** contrast,most estimators,such as the Buckley-James estimator and M-estimators .satisfy that P(≠βi.o.)=1.

关键词： consistency Super-efficiency Semi-parametric MLE

Nitric oxide removal by wastewater bacteria in a biotrickling filter

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Journal of Environmental Sciences 2014年第3期26卷 555-565页

作者： Hejingying Niu Dennis y.c.Leung chifat wong Tong Zhang Mayngor chan Fred c c Leung Department of Mechanical Engineering The University of Hong Kong School of Biological Sciences The University of Hong Kong Department of civil Engineering The University of Hong Kong

Nitric oxide （NO） is one of the most important air pollutants in atmosphere mainly emitted from combustion source. A biotriclding filter was designed and operated to remove NO from an air stream using bacteria extracted from the sewage sludge of a municipal sewage treatment plant. To obtain the best operation conditions for the biotrickling filter, orthogonal experiments （L9（34）） were designed. Inlet oxygen concentration was found to be the most significant factor of the biotrickling filter and has a significant negative effect on the system. The optimal conditions of the biotrickling filter occurred at a temperature of 40℃, a pH of 8.0 and a chemical oxygen demand of 165 mg/L in the recycled water with no oxygen in the system. The bacteria sample was detected by DNA sequencing technology and showed 93%-98% similarity to Pseudomonas mendocina. Moreover, a full gene sequencing results indicated the bacterium was a brand new strain and named as P. mendocina DLHK. This strain can transfer nitrate to organic nitrogen. The result suggested the assimilation nitrogen process in this system. Through the isotope experimental analysis, two intermediate products （^15NO and ^15N2O） were found. The results indicated the denitrification function and capability of the biotrickling filter in removing NO.

关键词： NO reduction biotrickling filter orthogonal experiment Pseudomonas mendocina isotope labeling

End Effect on the Twin-Wire Depth Probe

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Journal of Thermal Science 1992年第4期1卷 286-291页

作者： c.y.Liu y.W.wong 等 SchoolofMechanicalandProductionEngineering NanyangTechnologicalInstituteNayangAvenueSingapre2263 Sc

The end effect on the output voltage of a twin-wire depth probe was investigated both theoretically and ex- *** was found that the contribution of the end of the probe to the output voltage depends upon the distance between the boundary and the end of the probe and the geometrical configuration of the probe. By mounting a piece of plate to the end of the electrodes,the end effect can be ***,the size of the plate required to eliminate completely this effect is much larger than that usually mounted on commercially available *** between theoretical and experimental results was *** agreement was obtained.

关键词： twin-wire probe depth probe

Synthesis of self-assembled nanorod vanadium oxide bundles by sonochemical treatment

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Journal of Natural Gas chemistry 2009年第3期18卷 312-318页

作者： y.H.Taufiq-yap y.c.wong Z.Zainal M.Z.Hussein centre of Excellence for catalysis Science and Technology Faculty of ScienceUniversiti Putra Malaysia Department of chemistry Faculty of ScienceUniversiti Putra Malaysia

Self-assembled nanorod of vanadium oxide bundles were synthesized by treating bulk V2O5 with high intensity sonochemical technique. The synthesized materials were characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM）, transmission electron microscope （TEM） and temperature-programmed reduction （TPR） in H2. catalytic behaviour of the materials over anaerobic n-butane oxidation was studied through temperature-programmed reaction （TPRn）. catalytic evaluation of the sonochemical treated V2O5 products was also studied on microreactor. XRD patterns of all the vanadium samples were perfectly indexed to V2O5. The morphologies of the nanorod vanadium oxides as shown in SEM and TEM depended on the duration of the ultrasound irradiation. Prolonging the ultrasound irradiation duration resulted in materials with uniform, well defined shapes and surface structures and smaller size of nanorod vanadium oxide bundles. H2-TPR profiles showed that larger amount of oxygen species were removed from the nanorod V2O5 compared to the bulk. Furthermore, the nanorod vanadium oxide bundles, which were produced after 90, 120 and 180 min of sonochemical treatment, showed an additional reduction peak at lower temperature （-850 K）, suggesting the presence of some highly active oxygen species. TPRn in n-butane/He over these materials showed that the nanorod V2O5 with highly active oxygen species showed markedly higher activity than the bulk material, which was further proven by.c.talytic oxidation of n-butane.

关键词： nanorod vanadium oxide sonochemical treatment butane oxidation

On Systems of Boundary Value Problems for Differential Inclusions

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Acta Mathematica Sinica,English Series 2007年第3期23卷 549-556页

作者： Lynn ERBE christopher c.TISDELL Patricia J.y.wong Department of Mathematics The University of Nebraska-LincolnLincolnNE 68588-0130USA School of Mathematics and Statistics The University of New South WalesSydney 2052Australia School of Electrical and Electronic Engineering Nanyang Technological University50 Nanyan9 AvenueSingapore 639798Singapore

Herein we consider the existence of solutions to second-order, two-point boundary value problems （BVPs） for systems of ordinary differential inclusions. Some new Bernstein-Nagumo conditions are presented that ensure a priori bounds on the derivative of solutions to the differential inclusion. These a priori bound results are then applied, in conjunction with appropriate topological methods, to prove some new existence theorems for solutions to systems of BVPs for differential inclusions. The new conditions allow of the treatment of systems of BVPs without growth restrictions.

关键词： boundary value problem, systems of differential inclusions, existence of solutions a priori bounds Bernstein-Nagumo condition

Effects of polydimethylsiloxane membrane surface treatments on human uterine smooth muscle cell strain response

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Bioactive Materials 2024年第2期32卷 415-426页

作者： Elizabeth E.Marr Brett c.Isenberg Joyce y.wong Boston University Division of Materials Science and EngineeringUnited States charles Stark Draper Laboratory Bioengineering DivisionUnited States Boston University Department of Biomedical EngineeringUnited States

In the United States,1 in 10 infants are born *** majority of neonatal deaths and nearly a third of infant deaths are linked to preterm *** birth is initiated when the quiescent state of the uterus ends prematurely,leading to contractions and parturition beginning as early as 32 weeks,though the origins are not well *** enable research and discovery of therapeutics with potential to better address preterm birth,the capability to study isolated cell processes of pregnant uterine tissue in vitro is *** development of an in vitro model of the myometrium utilizing human uterine smooth muscle cells(uSMcs)responsible for contractions provides a methodology to examine cellular mechanisms of late-stage pregnancy potentially involved in preterm *** discuss culture of uSMcs on a flexible polydimethylsiloxane(PDMS)substrate functionalized with cationic poly-L-lysine(PLL),followed by extracellular matrix(EcM)protein *** work exploring uSMc behavior on PDMS substrates have utilized collagen-I coatings,however,we demonstrated the first exploration of human uSMc response to strain on fibronectin-coated flexible membranes,importantly reflecting the significant increase of fibronectin content found in the myometrial EcM during late-stage *** the model we developed,we conducted proof-of-concept studies to investigate the impact of substrate strain on uSMc cell morphology and gene *** was found that PLL and varied EcM protein coatings(collagen I,collagen III,and fibronectin)altered cell nuclei morphology and density on PDMS ***,varied strain rates applied to uSMc substrates significantly impacted uSMc gene expression of IL-6,a cytokine associated with instances of preterm *** results suggest that both surface and mechanical properties of in vitro systems impact primary human uSMc phenotype and offer uSMc culture methodologies that can be utilized to further the understanding of cellu

关键词： Uterine Myometrium Bioengineered in vitro models Strain Pregnancy Nuclei Interleukin 6 Preterm labor

Generation of Electron Traps at High Field in Silicon Oxide Films

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chinese Physics Letters 1995年第7期12卷 420-423页

作者： B.L.yang H.wong y.c.cheng Department of Electronic Engineering City University of Hong KongTat Chee AvenueKowloonHONG KONG

Temperature dependences of the high-field electron trapping in a SiO_(2) thin film for temperature ranging from 100 to 423K are *** is found that in the investigated temperature range,when the temperature decreases the effective surface density of the electron traps in the film decreases;the energy levels of the effective electron traps at high field concentrate at very narrow energy *** thermal generation rate is found to be 1.283x10^(10)/cm^(2).K and its activation energy is *** on these results,a model for the electron traps generated at high field in thin oxide is proposed.

关键词： film Electron energy

cD137L,a driver of harmful inflammation in the nervous system

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Neural Regeneration Research 2023年第11期18卷 2387-2388页

作者： Hiu yi wong Amanda c.y.c.an Anselm Mak Herbert Schwarz Division of Life Science State Key Laboratory of Molecular NeuroscienceMolecular Neuroscience CenterThe Hong Kong University of Science and TechnologyHong Kong Special Administrative RegionChina Hong Kong center for Neurodegenerative Diseases Hong Kong Special Administrative RegionChina Division of Neurology University Medicine ClusterNational University HospitalSingapore Department of Medicine Yong Loo Lin School of MedicineNational University of SingaporeSingapore Division of Rheumatology University Medicine ClusterNational University Health SystemDepartment of MedicineYong Loo Lin School of MedicineNational Univesity of SingaporeSingapore Department of Physiology and Immunology ProgrammeYong Loo Lin School of MedicineNational University of SingaporeSingapore Integrative Sciences and Engineering Programme NUS Graduate SchoolNational University of SingaporeSingapore

cD137 (TNFRSF9,4-1BB) is a member of the tumor necrosis factor (TNF) receptor family and a potent costimulatory *** levels of cD137 are expressed on T cells upon ***137 signaling in T cells,either by.c.gnate interaction with antigen-presenting cells (APc)or by agonistic anti-cD137 antibodies,strongly enhances proliferation,interferon-y secretion,and cytolytic activity of T ***,cD137 signaling is a main driver of cellular,type 1 helper T cells (Th1)and type 1 cytolytic T cells (Tc1) polarised immune responses.

关键词： cD137 cD137L inflammation

A Preliminary Study of c-reactive Protein in the Diagnosis and Monitoring of Lyme Disease

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Biomedical and Environmental Sciences 1996年第4期9卷 424-429页

作者： S.S.cHAN y..c.wong 等 DepartmentofAppliedBiology HongKongBaptistUniversityHongKong clinicalLaboratory HongKongCentralHospi

concentrations of c-reactive protein (cRP) in the serum of 14 patients suffering from Lyme diseasc were measured. 86% of these patients were found to have abnormally high concentrations of serum cRP (range 14-158 mg/L). The cRP concentration of a 60-yearold patient abated from 29 mg/L to 13 mg/L after treatrnent. Results suggest that serum cRP concentration can provide a valuable and accurate means for the clinical diagnosis and monitoring of Lyme disease

关键词： cRP A Preliminary Study of c-reactive Protein in the Diagnosis and Monitoring of Lyme Disease