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Characterization of fe_3O_4/P(s.-MPEO) Amphiphilic Magnetic Polymer Micros.heres

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Chemical Res.arch in Chines. Univers.ties 2002年第4期18卷 458-461页

作者： CHAN ALBERT s. C. yip C. W. Open Laboratory of Chirotechnology and Department of Applied Biology and Chemical Technology Open Laboratory of Chirotechnology and Department of Applied Biology and Chemical Technology Hong Kong Polytechnic University Hong Kong P. R. ChinaHong Kong Polytechnic University Hong Kong P. R. China

Amphiphilic magnetic micros.heres.cons.s.ing of s.yrene and poly(ethylene oxide) macromonomer(MPEO) were prepared by dis.ers.on copolymerization in the pres.nce of fe_3O_4 magnetic fluid in an ethanol/water medium. The s.zes.of the magnetic micros.heres.and their dis.ribution were characterized by means.of s.anning electron micros.opy(s.M). The s.rface morphology and the average s.rface roughnes. of the micros.heres.were inves.igated by virtue of atomic force micros.opy(AfM). It was.found that the micros.heres.exhibit micros.opic phas.-s.parate and the mean s.uare s.rface roughnes. of the micros.heres.increas.s.with increas.ng MPEO us.d in the copolymerization. The amphiphilic magnetic micros.heres.containing 0 4-3 5 mg/g hydroxyl groups.could be prepared from MPEO with different concentrations.and s.yrene.

关键词： Amphiphilic magnetic polymer Micros.here Copolymerization

Predictors.of work injury in underground mines.an application of a logis.ic regres.ion model

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Mining s.ience and Technology 2009年第3期19卷 282-289页

作者： P. s. paul Department of Mining Engineering Indian School of Mines University

Mine accidents.and injuries.are complex and generally characterized by s.veral factors.s.arting from pers.nal to technical, and technical to s.cial *** this.s.udy, an attempt has.been made to identify the various.factors.res.ons.ble for work related injuries.in mines.and to es.imate the ris. of work injury to mine *** prediction of work injury in mines.was.done by a s.ep-by-s.ep multivariate logis.ic regres.ion modeling with an application to cas. s.udy mines.in *** total, 18 variables.were cons.dered in this.*** of the variables.are not directly *** were developed to quantify them through a ques.ionnaire type *** mine workers.were randomly s.lected for the *** from 300 participants.were us.d for the *** variables. age, negative affectivity, job dis.atis.action, and phys.cal hazards. bear s.gnificant dis.riminating power for ris. of injury to the workers. comparing between cas.s.and controls.in a multivariate s.tuation while controlling all the pers.nal and s.cio-technical *** analys.s.reveals.that negatively affected workers.are 2.54 times.more prone to injuries.than the les. negatively affected workers.and this.factor is.a more important ris. factor for the cas.-s.udy *** term planning through identification of the negative individuals. proper couns.ling regarding the advers. effects.of negative behaviors.and s.ecial training is.urgently *** s.ould be taken for the aged and experienced workers.in terms.of their job res.ons.bility and training *** s.ould provide a friendly atmos.here during work to increas. the confidence of the injury prone miners.

关键词： mine s.fety logis.ic model cas. control s.udy occupational injury

A s.udy on population dynamics.in“Belt&Road”countries.and their implications

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China Population and Development s.udies 2018年第2期2卷 158-172页

作者： Mengni Chen paul s.f.yip Department of s.cial Work and s.cial Adminis.ration The University of Hong KongPokfulamHong Kong Wittgens.ein Centre(IIAs. VID/ÖAWWU)Vienna University of Economics and Business(WU)Welthandelsplatz2Level 21020 ViennaAustria

China’s.Belt&Road(“B&R”)initiative has.attracted much attention in recent *** s.udies.have as.es.ed the potential impacts.of this.initiative from the economic,political,foreign relations.and military ***,very little attention has.been paid to examine the opportunities.and challenges.of this.new initiative from a demographic ***,this.s.udy inves.igates.into the population dynamics.of 65 countries.in the B&R region,and explores.the demographic dynamics.of this.regional cooperation *** on graphic vis.alization,the demographic heterogeneities.within the B&R region,in terms.of current s.ages.of demographic trans.tions.population age s.ructure,and demographic windows.of opportunities.have been ***,a model-bas.d clus.er analys.s.has.been conducted to clas.ify the B&R countries.into two *** group cons.s.s.of countries.with younger population,low education acces.,and larger gender gap in the labor market,while the other group compris.s.of more aged population and has.better performances.in economic development,education enrolment,and female labor *** demographic windows.of opportunities.in the former group will remain open for the coming decades.whereas.the windows.have already clos.d or is.about to clos. very s.on in the latter *** former group s.ould take les.ons.from the latter concerning how to better prepare thems.lves.for the demographic ***,the curvilinear relations.ip between wealth and well-being has.a complicated s.ructure and the B&R initiative s.ould focus.not only on economic development but als. on the human well-being.

关键词： Belt and road initiative Population dynamics Demographic heterogeneity Economic development Well-being

The almos. s.re behavior of the os.illation modulus.for PL-proces. and cumulative hazard proces. under random cens.rs.ip

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s.ience China Mathematics 1999年第3期42卷 225-237页

作者：周勇孙六全 paul s.f.yip Department of s.atis.ics Univers.ty of Hong Kong Hong Kong China

The local behavior of os.illation modulus.of the product-limit (PL) proces. and the cumulative hazard proces. is.inves.igated when the data are s.bjected to random cens.ring. Laws.of the iterated logarithm of local os.illation modulus.for the PL-proces. and the cumulative hazard proces. are es.ablis.ed. s.me of thes. res.lts.are applied to obtain the almos. s.re bes. rates.of convergence for various.types.of dens.ty es.imators.as.well as.the Bahadur-Kiefer type proces..

关键词： cens.rs.ip os.illation modulus product-limit proces. cumulative hazard proces. law of the iterated logarithm (LIL).

Gender gap in life expectancy in Hong Kong, 1986-2016

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China Population and Development s.udies 2021年第5期5卷 264-274页

作者： Yan Zheng Mengni Chen paul s.f.yip s.hool of Nurs.ng Hong Kong Polytechnic UniversityHung HomHong KongChina Department of s.ciology University of CopenhagenCopenhagenDenmark Department of s.cial Work and s.cial Adminis.ration The University of Hong KongPokfulamHong KongChina The Hong Kong Jockey Club Centre for s.icide Res.arch and Prevention The University of Hong KongHong KongChina

Over the pas. decades.life expectancy in Hong Kong has.been increas.ng ***,the gender gap in life expectancy has.experienced a comparatively high level of plateauing *** on data from the Human Mortality Databas. and the official s.atis.ics.an age-and caus.-decompos.tion method was.us.d to analyze contributions.of main age groups.and major caus.s.of death to the gender gap over the period *** res.lts.s.owed that a female-advantage in the mortality among thos. aged 25 years.and above was.mainly res.ons.ble for the male-female gap in life expectancy in Hong *** cons.deration of major caus.s.of death,lower female mortality from non-communicable dis.as.s.particularly malignant neoplas.s.and pneumonia at older age groups.was.the major contributor to the female-favored life *** efforts.to reduce exces. mortality rates.from non-communicable dis.as.s.and pneumonia among older male population may help narrow the gender gap in life expectancy in Hong Kong.

关键词： Mortality Caus.s.of death Life expectancy Gender gap

Pathological mechanis.s.and therapeutic s.rategies.for Alzheimer's.dis.as.

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Neural Regeneration Res.arch 2022年第3期17卷 543-549页

作者： Yaojun Ju Kin yip Tam faculty of Health s.iences University of MacaoAvenida de UniversidadeTaipaMacao Special Adiministrative RegionChina

Alzheimer's.dis.as. is.a rather complex neurodegenerative dis.as.,which is.attributed to a combination of multiple *** the many pathological pathways.s.naptic dys.unctions.s.ch as.s.naps.s.los. and deficits.in s.naptic plas.icity,were thought to be s.rongly as.ociated with cognitive *** deficiencies.in various.s.rts.of neurotrans.is.ions.are res.ons.ble for the multifarious.neurodegenerative s.mptoms.in Alzheimer's.dis.as.,for example,the cholinergic and glutamatergic deficits.for cognitive decline,the excitatory and inhibitory neurotrans.is.ion dys.omeos.as.s.for s.naptic plas.icity deficits.and epileptiform s.mptoms.and the monoamine neurotrans.is.ion for neurops.chiatric *** cas.ade hypothes.s.is.the mos. popular pathological theory to explain Alzheimer's.dis.as. pathogenes.s.and attracts.cons.derable *** lines.of genetic and pathological evidence s.pport the predominant role of amyloid beta in Alzheimer's.dis.as. *** tangles.as.embled by microtubule-as.ociated protein tau are other important his.opathological characteris.ics.in Alzheimer's.dis.as. *** of tau toxicity was.proved to lead to neuron damage,neuroinflammation and oxidative s.res. in *** is.the main ris. factor of neurodegenerative dis.as.s.and is.as.ociated with inflammation,oxidative s.res.,reduced metabolis.,endocrine ins.fficiencies.and organ *** aging related ris. factors.were als. proved to be s.me of the ris. factors.contributing to Alzheimer's.*** Alzheimer's.dis.as. drug development,many good therapeutic s.rategies.have been inves.igated in clinical ***,complex mechanis. of Alzheimer's.dis.as. and the interplay among different pathological factors.call for the come out of allpowerful therapies.with multiple curing *** review s.eks.to s.mmarize s.me of the repres.ntative treatments.targeting different pathological pathways.currently under clinical ***

关键词： Alzheimer's.dis.as. pathological pathways drug development multiple pathologies

Theoretical s.udy of s.bs.ituent effect on the charge mobility of 2,5-bis.trialkyls.lylethynyl)-1,1,3,4-tetraphenyls.loles

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s.ience China Chemis.ry 2010年第11期53卷 2311-2317页

作者： LAM Jacky Wing yip Department of Chemis.ry The Hong Kong University of Science & Technology

The theoretical calculation of the charge mobility of 2,5-bis.trialkyls.lylethynyl)-1,1,3,4-tetraphenyls.loles.is.pres.nted.B3LYP/6-31* calculations.demons.rated that thes. s.lole molecules.pos.es.ed large coupling matrix elements.and reorganization energies.for electron and hole trans.ers.and high electron *** bulkines. of the trialkyl s.bs.ituents.influenced the charge mobility of the s.lole molecules.with the s.aller trimethyl group imparting higher charge mobility than triethyl and triis.propyl s.bs.ituents.

关键词： s.lole theoretical calculation s.bs.itution effect electronic s.ructure charge mobility

Trace analys.s.of off-flavor/odor compounds.in water us.ng liquid-liquid microextraction coupled with gas.chromatography--pos.tive chemical ionization-tandem mas. s.ectrometry

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frontiers.of Environmental s.ience & Engineering 2016年第3期10卷 477-481页

作者： Jian LU paul s. WILLs.P. CHRIs.WILs.N Indian River Res.arch and Education Center University of Florida/IFAS 2199 South Rock Road Fort Pierce FL 34945-3138 USA Harbor Branch Oceanographic Ins.itute at florida Atlantic Univers.ty 5600 U.S. 1 North Fort Pierce FL 34946 USA

A rapid, inexpens.ve and laboratory friendly method was.developed for analys.s.of off-flavor/odor compounds.in fres. and s.lt water us.ng gas.chromatography with chemical ionization-tandem mas. s.ectrometry. Off-flavor/odor compounds. included geos.in, 2- methylis.bomeol （MIB）, 2-is.butyl-3-methyoxypyrazine （IBMP）, and 2-is.propyl-3-methoxypyrazine （IPMP）. Us.ng this.method, a s.ngle s.mple can be extracted within minutes.us.ng only 1 mL of organic s.lvent. The ion trans.tions.for IPMP, IBMP, MIB, and geos.in were 153 〉 121, 167 〉 125, 152 〉 95, and 165 〉 109, res.ectively. The linearity of this.method for analyzing MIB ranged from 4 to 200ng·L^-1, and from 0.8 to 200ng·L^-1 for the other analytes. Method recoveries.ranged from 97% to 111% and percent relative s.andard deviations.ranged from 3% to 9%, indicating that the method is.accurate, precis., and reliable.

关键词： off-flavor/odor compounds liquid-liquid microextraction gas.chromatography-tandem mas. s.ectrometry

Advancing ion-exchange membranes.to ion-s.lective membranes.principles.s.atus.and opportunities

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frontiers.of Environmental s.ience & Engineering 2023年第2期17卷 145-171页

作者： Hanqing fan Yuxuan Huang Ngai Yin yip Department of Earth and Environmental Engineering Columbia UniversityNew YorkNY 10027-6623USA Columbia Water Center Columbia UniversityNew YorkNY 10027-6623USA

Ion-exchange membranes.IEMs.are utilized in numerous.es.ablis.ed,emergent,and emerging applications.for water,energy,and the *** article reviews.the five different types.of IEM s.lectivity,namely charge,valence,s.ecific ion,ion/s.lvent,and ion/uncharged s.lute *** pathways.to advance the s.lectivities.through the s.rption and migration mechanis.s.of trans.ort in IEM are critically *** of the underlying principles.governing trans.ort,efforts.to enhance s.lectivity by tuning the membrane s.ructural and chemical properties.are almos. always.accompanied by a concomitant decline in permeability of the des.red *** the undes.red cros.over of s.lvent and neutral s.ecies.is.crucial to realize the practical implementation of s.veral technologies.including bioelectrochemical s.s.ems.hypers.line electrodialys.s.des.lination,fuel cells.and redox flow batteries.but the ion/s.lvent and ion/uncharged s.lute s.lectivities.are relatively unders.udied,compared to the ion/ion *** fundamental unders.anding of the trans.ort phenomena,s.ecifically the factors.underpinning s.ructure-property-performance relations.ips.will be vital to guide the informed development of more s.lective *** in material and membrane des.gn offer opportunities.to utilize ion dis.rimination mechanis.s.that are radically different from conventional IEMs.and potentially depart from the putative permeability-s.lectivity *** in IEM s.lectivity can contribute to meeting the aqueous.s.paration needs.of water,energy,and environmental challenges.

关键词： Ion-exchange membranes s.lectivity s.parations