检索结果-南通市图书馆

PM_(2.5) in Ch.na:Measurements,sources,visibility.and h.alth.effects,and mitigation

在线全文

学校读者我要写书评

暂无评论

Particuology 2014年第2期12卷 1-26页

作者： david y.h.pui Sh.ng-Ch.eh.Ch.n Zh.li Zuo Department of Mech.nical Engineering College of Science and EngineeringUniversity of Minnesota

Concern over th. h.alth.effects of fine particles in th. ambient environment led th. U.S. Environmental Protection Agency.to develop th. first standard for PM2.5 （particulate matter less th.n 2.5 μm） in 1997. Th. Particle Tech.ology.Laboratory.at th. University.of Minnesota h.s h.lped to establish.th. PM2.5 standard by.developing many.instruments and samplers to perform atmosph.ric measurements. In th.s paper, we review various aspects of PM2.5, including its measurement, source apportionment, visibility.and h.alth.effects, and mitigation. We focus on PM2.s studies in Ch.na and wh.re appropriate, compare th.m with.th.se obtained in th. U.S. Based on accurate PM2.5 sampling, ch.mical analy.is, and source apportionment models, th. major PM2.5 sources in Ch.na h.ve been identified to be coal combustion, motor veh.cle emissions, and industrial sources. Atmosph.ric visibility.h.s been found to correlate well with.PM2.s concentration. Sulfate, ammonium, and nitrate carried by.PM2.s, commonly.found in coal burning and veh.cle emissions, are th. dominant contributors to regional h.ze in Ch.na. Sh.rt-term exposure to PM2.s is strongly.associated with.th. increased risk of morbidity.and mortality.from cardiovascular and respiratory.diseases in Ch.na. Th. strategy.for PMzs mitigation must be based on reducing th. pollutants from th. two primary.sources of coal-fired power plants and veh.cle emissions. Alth.ugh.conventional Particulate Emission Control Devices （PECD） such.as electrostatic precipitators in Ch.nese coal-fired power plants are generally.effective for large particles, most of th.m may.not h.ve h.gh.collection efficiency.of PM2.5. Bagh.use filtration is gradually.incorporated into th. PECD to increase th. PM2.5 collection efficiency. By.adopting stringent veh.cle emissions standard such.as Euro 5 and 6, th. emissions from veh.cles can be gradually.reduced over th. y.ars. An integrative approach. from collaboration among academia, government, and industries, can effe

关键词： PM2.5 in Ch.naAtmosph.ric particle size distributionPM2.5 samplingCh.mical composition of PM2.sSource apportionment modelsPM2.5 h.alth.impactPM2.s mitigationCoal-fired power plantParticle emission control devices (PECD)Bagh.use filtrationIntegrative approach

Great wall of solar panels to mitigate y.llow dust storm

在线全文

学校读者我要写书评

暂无评论

Particuology 2014年第2期12卷 146-149页

作者： david y.h.pui Junji Cao Zh.sh.ng An Jing Wang University.of Minnesota Department of Mechanical EngineeringMinneapolisMN 55455USA Institute of Earth.Environment Chinese Academy of Sciences ETh.Zurich Institute of Environmental Engineering8093 ZurichSwitzerland EMPA Analytical Chemistry8600 Dubendorf Switzerland

Mitigation of th. large scale y.llow dust storm is a serious problem facing Ch.na. We propose th. approach.of building windbreak walls equipped with.solar panels in th. proximity.of dust origins. Th. solar panels generate electricity.in th. sunny.day.; th. walls break th. wind and remove airborne dusts based on th. impactor principle during wind storms. Preliminary.calculation indicates th. walls may.be able to remove th. major fraction of th. airborne dusts and th. generated electricity.could be significant. More detailed studies are needed to prove th. feasibility.of th. approach.

关键词： Solar panels Dust storm Mitigation Windbreak Sustainable development

2nd UMN-CAS Bilateral Seminar on PM2.5 science, h.alth.effects and control tech.ologies, October 7-8, 2015 at 3M Innovation Center, Maplewood, MN, USA

在线全文

学校读者我要写书评

暂无评论

Particuology 2016年第4期14卷 141-142页

作者： david y.h. pui Junji Cao University.of Minnesota MN 55455 USA Institute of Earth.Environment Chinese Academy of Sciences Xi'an China

Th. First UMN-CAS Bilateral Seminar was successfully.h.ld in Xi＇an, Ch.na, May.27-28,2014. A summary.of th. 1 st Bilateral Seminar was publish.d in Particuology.16 （2014）, 227-229. Th. Second UMN-CAS Bilateral Semi... 详细信息

关键词： @@

Integrative filtration research.and sustainable nanotech.ology

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Particuology 2013年第1期11卷 5-13页

作者： Jing Wang Drew Th.mpson david y.h.pui Institute of Environmental Engineering ETH Zurich 8093Switzerland Analy.ical Ch.mistry Empa8600 DubendorfSwitzerland Particle Tech.ology.Laboratory University of Minnesota55455USA

With.th. wide applications of nanomaterials in an array.of industries, more concerns are being raised about th. occupational h.alth.and safety.of nanoparticles in th. workplace, and implications ofnanotech. nology.on th. environment and living sy.tems. Studies on environmental, h.alth.and safety.（Eh.） issues of nanomaterials play.a significant role in public acceptance, and eventual sustainability. of nanotech.ol- ogy. We present research.results on th.ee aspects of th. Eh. studies： ch.racterization and measurement of nanoparticles, nanoparticle emission and exposure at workplaces, and control and abatement of nanoparticle release using filtration tech.ology. Measurement of nanoparticle agglomerates using a newly.developed instrument, th. Universal Nanoparticle Analy.er, is discussed. Nanoparticle emission and exposure measurement results for carbon nanotubes in th. manufacture of nanocomposites and for silicon nanoparticles in th.ir production at a pilot scale facility.are presented. Filtration of nanoparticles and nanoparticle agglomerates are also studied.

关键词： Agglomerate Sustainability.Exposure Filtration Nano-Eh. Nanoparticle

Silk-based nerve guidance conduits with.macroscopic h.les modulate th. vascularization of regenerating rat sciatic nerve

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第6期20卷 1789-1800页

作者： Carina h.omada Patrick h.imel Markus Kerbl LászlóGál Sy.via Nürnberger Barbara Sch.edl James Ferguson Nicole Swiadek Xavier Monforte Joh.nnes C.h.inzel Antal Nógrádi Andreas h.Teusch.-Woller david h.rch.r Department Life Science Engineering University of Applied Sciences Technikum WienViennaAustria Austrian Cluster for Tissue Regeneration ViennaAustria Ludwig Boltzmann Institute for Traumatology The Research Center in Cooperation with AUVAViennaAustria University.Clinic of Dentistry Medical University of ViennaViennaAustria Department of Plastic Reconstructive and Aesthetic SurgeryLandesklinikum Wiener Neustadt2700 Wiener NeustadtAustria Department of Anatomy Histology and EmbryologyAlbert Szent-Györgyi Medical SchoolUniversity of SzegedSzegedHungary Medical University.of Vienna Department of Orthopedics and Trauma SurgeryDevision of Trauma SurgeryViennaAustria Department of h.nd- PlasticReconstructive and Burn SurgeryBG Unfallklinik TuebingenUniversity of TuebingenTuebingenGermany

Periph.ral nerve injuries induce a severe motor and sensory.deficit. Since th. availability.of autologous nerve transplants for nerve repair is very.limited, alternative treatment strategies are sough., including th. use of tubular nerve guidance conduits(tNGCs). h.wever, th. use of tNGCs results in poor functional recovery.and central necrosis of th. regenerating tissue, wh.ch.limits th.ir application to sh.rt nerve lesion defects(ty.ically.sh.rter th.n 3 cm). Given th. importance of vascularization in nerve regeneration, we h.0}oth.sized th.t enabling th. growth.of blood vessels from th. surrounding tissue into th. regenerating nerve with.n th. tNGC would h.lp eliminate necrotic processes and lead to improved regeneration. In th.s study. we reported th. application of macroscopic h.les into th. tubular walls of silk-based tNGCs and compared th. various features of th.se improved silk^(+) tNGCs with.th. tubes with.ut h.les(silk^(–) tNGCs) and autologous nerve transplants in an 8-mm sciatic nerve defect in rats. Using a combination of micro-computed tomograph.0}and h.stological analy.es, we were able to prove th.t th. use of silk^(+) tNGCs induced th. growth.of blood vessels from th. adjacent tissue to th. intraluminal neovascular formation. A significantly.h.gh.r number of blood vessels in th. silk^(+) group was found compared with.autologous nerve transplants and silk^(–), accompanied by.improved axon regeneration at th. distal coaptation point compared with.th. silk^(–) tNGCs at 7 weeks postoperatively. In th. 15-mm(critical size) sciatic nerve defect model, we again observed a distinct ingrowth.of blood vessels th.ough.th. tubular walls of silk^(+) tNGCs, but with.ut improved functional recovery.at 12 weeks postoperatively. Our data proves th.t macroporous tNGCs increase th. vascular supply.of regenerating nerves and facilitate improved axonal regeneration in a sh.rt-defect model but not in a critical-size defect model. Th.s study.suggests th.t furth.r optimizatio

关键词： axon regeneration blood vessel functional recovery macroporous nerve lesion periph.ral nerve repair sciatic nerve silk-based nerve guidance conduit vascularization

在线全文

学校读者我要写书评

暂无评论

基于载锰沸石分子筛的臭氧催化分解特性

工程科学学报 2025年第1期47卷 170-178页

作者：陈浩玥郭卓男刘应书杨雄裴有康李子宜北京科技大学能源与环境工程学院北京100083 香港中文大学(深圳)理工学院深圳518172 明尼苏达大学机械工程系明尼阿波利斯55455

臭氧作为重点防控的室内气态污染物广泛存在于人类生产、生活中,亟待开发高效的臭氧分解转化器从源头进行净化,催化剂是其核心关键.本文基于金属离子改性沸石分子筛进行臭氧催化性能研究,基于不同沸石拓扑结构、阳离子种类、改性手段及... 详细信息

臭氧作为重点防控的室内气态污染物广泛存在于人类生产、生活中,亟待开发高效的臭氧分解转化器从源头进行净化,催化剂是其核心关键.本文基于金属离子改性沸石分子筛进行臭氧催化性能研究,基于不同沸石拓扑结构、阳离子种类、改性手段及干燥方法,优选得到了采用等体积浸渍法和微波干燥法组合制备的载锰USy.石Mn-USy.DT/WB,相较商用臭氧分解催化剂具有可逆再生的优势.通过系列表征,提出了可能的长效稳定催化臭氧的机制:单位时间内臭氧分子在沸石上的吸附与催化分解的相互协调,决定了沸石对臭氧的稳态催化分解,呈现宏观所得的脱除效率随时间变化曲线.通过XPS表征分析优选沸石升温可逆再生的潜在原因,再生后Mn-USy.DT/WB的平均化合态(Average oxidation state,AOS)由2.95降至2.81,经过加热处理后部分吸附在活性位点的中间氧物种脱附,氧空位释放,因此催化活性恢复.将优选沸石涂敷制得整体式蜂窝沸石催化剂,在实际应用条件(170℃、50000 h.1空速)下可维持99%臭氧分解效率1000 h.上.本工作为长效低阻臭氧分解催化剂的开发提供了新思路.

关键词：臭氧催化剂沸石分子筛整体式蜂窝催化剂再生

在线全文

学校读者我要写书评

暂无评论

Reply.to th. comment

Particuology 2014年第2期12卷 150-150页

作者： david y.h.pui Junji Cao Zh.sh.ng An Jing Wang

We are grateful for th. experts＇ comments on our manuscript. We fully.understand th. experts＇ concerns on th. feasibility.of th. proposed idea of building windbreak walls equipped with.solar panels to mitigate th. y.llow dust storm. As stated in th. manuscript, we h.ve not considered many.important factors, such.as th. limits posed by.solar panels, operability.of solar panels under h.rsh.conditions, th. local weath.r and geomorph.logical conditions, electricity.storage and transportation, financial aspects, etc. h.wever, th. manuscript is intended to present a Big Idea to stimulate more interesting ideas to solve Big Problems.

关键词： Reply.to th. comment

Interactions among age, adiposity. body.eigh., lifesty.e factors and sex steroid h.rmones in h.alth.0}Singaporean Ch.nese men

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2007年第5期9卷 611-621页

作者： Victor h. h. Goh.Terry.y. y. Tong h.len E E Mok Bah.rudin Said Department of Obstetrics and Gy.aecology National University of Singapore National University Hospital Kent Ridge119074 Singapore Core Lab General Clinical Research Center LA BioMed at Harbor-UCLA Medical Center and Department of Medicine Division of Endocrinology David Geffen School of Medicine 1124W Carson Street Torrance CA 90502 USA

Aim： To examine th. inter-relationsh.ps among age, lifesty.e factors, anth.opometric parameters, percent body.fat and steroid h.rmone parameters in 531 h.alth.0}Singaporean Ch.nese men aged between 29 and 72 y.ars old. Meth.ds： Various lifesty.e parameters were quantified th.ough.a survey. and testosterone （T）, estradiol （E2）, deh.0}roepiandrosterone sulph.te （Dh.AS） and sex h.rmone binding globulin （Sh.G） were measured using establish.d meth.ds. Anth.opometric parameters were collected and computed, and percent body.fat （Siri） was measured using th. DEXA scanner. Results： Sh.G, Dh.AS, bioavailable-T （Bio-T）, E2, Siri, h., W/h. W/h. and work stress were independently.correlated with.age. Using multivariate analy.es and adjusting for age and oth.r related factors, exercise, smoking and alcoh.l consumption h.ve positive impacts on androgen levels and body.composition. h.wever, black and green tea consumption was associated with.negative effects on body.composition and with.h.gh.r levels of E2 and Free Estradiol Index （FEI）. Men with.sh.rter sleep duration h.d significantly.lower T levels as compared to th.se with.6 h.or more of nigh.ly.sleep. h.gh.r T levels were associated with.lower levels of adiposity.and oth.r indices of adiposity. wh.reas h.gh.r E2 levels were related to h.gh.r levels of adiposity. Men with.h.gh.r Dh.AS were significantly.taller and h.avier th.n th.se with.low Dh.AS levels. Conclusion： Th. study.sh.wed th. close interactions among th. gonadal/adrenal and metabolic compartments, with.age being a key.determinant in th.ir interactions. Lifesty.e factors such.as exercise, smoking, sleeping and alcoh.l and tea consumption migh. play.significantly.roles in determining th. status of h.alth.in men.

关键词： age testosterone sex h.rmone binding globulin estradiol deh.0}roepiandrosterone sulph.te bioavailable-testosterone body.fat exercise smoking alcoh.l tea coffee stress sleep

Differential impact of aging and gender on lipid and lipoprotein profiles in a coh.rt of h.alth.0}Ch.nese Singaporeans

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2007年第6期9卷 787-794页

作者： Victor h. h. Goh.Terry.y. y. Tong h.len P. P. Mok Bah.rudin Said Department of Obstetrics and Gy.ecology National University of Singapore National University Hospital Kent Ridge 119074 Singapore Core Lab at General Clinical Research.Center LA Biomed Harbor-UCLA Medical Center and Department of Medicine Division of Endocrinology David Geffen School of Medicine at UCLA 1124W Carson Street Torrance CA 90502 USA

Aim： To evaluate th. impact of age and gender on lipid and lipoprotein profiles and th. burden of dy.lipidemia in a coh.rt of h.alth.0}Ch.nese Singaporean. Meth.ds： A total of 1 775 h.alth.0}Ch.nese, 536 men and 1 239 women aged between 30 and 70 y.ars old were involved in th. present study. Results： Gender differences in all lipid and lipoprotein levels were clearly.evident. Singaporean Ch.nese men h.ve significantly.h.gh.r levels of total ch.lesterol （TC）, trigly.eride （TG）, low density.lipoprotein-ch.lesterol （LDL-C） and total ch.lesterol/h.gh.density.lipoprotein-ch.lesterol （TC/h.L-C）, and lower levels of h.L-C th.n women. Alth.ugh.lipid and lipoprotein levels in men did not ch.nge in th. different age groups, th.se in women, especially.TC, LDL-C and TC/h.L-C, were significantly.h.gh.r in older women （〉 50 y.ars old） th.n corresponding levels in y.unger women （30-46 y.ars old）. Furth.rmore, TG was significantly.correlated with.lipids and lipoproteins differently.in men and women. If 100 mg/dL of LDL-C were to be adopted as th. th.rapeutic cut-off level, th.n th. burden of care will be h.ge as approximately.90% of both.Ch.nese men and women h.ve LDL-C greater th.n 100 mg/dL. Condusion： In ligh. of th. findings of th. present study. we suggest th.t preventive measures to promote th. reduction in risk of coronary.h.art disease （Ch.） must address th. h.gh.proportion of men and women with.h.gh.LDL-C, and th.t th.se measures sh.uld take into account both.th. gender and age factors. For men, reduction of h.gh.ch.lesterol must start early.in life, wh.reas for women, steps must be taken earlier to mitigate th. anticipated sh.rp increase in risk, especially.after menopause.

关键词： total ch.lesterol low density.lipoprotein-ch.lesterol h.gh.density.lipoprotein-ch.lesterol trigly.eride total ch.lesterol/h.gh.density.lipoprotein-ch.lesterol cardiovascular diseases, arth.riosclerosis Asian men and women