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Impact of asymptomatic COVID-19 carriers on pandemic policy outcomes

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Infectious Disease Modelling 2022年第1期7卷 16-29页

作者： Weijie Pang Hassan Chehaitli t.r.hurd Mathematics&Statistics McMaster University1280 Main St.WestHamiltonOntarioL8S 4L8Canada

this paper provides a mathematical model that makes it clearly visible why the underestimation of r,the fraction of asymptomatic COVID-19 carriers in the general population,may lead to a catastrophic reliance on the standard policy intervention that attempts to isolate all confirmed infectious *** SE(AþO)r model with infectives separated into asymptomatic and ordinary carriers,supplemented by a model of the data generation process,is calibrated to standard early pandemic datasets for two *** is shown that certain fundamental parameters,critically r,are unidentifiable with this data.A general analytical framework is presented that projects the impact of different types of policy *** is found that the lack of parameter identifiability implies that some,but not all,potential policy interventions can be correctly *** an example representing Italy in March 2020,a hypothetical optimal policy of isolating confirmed cases that aims to reduce the basic reproduction number r0 of the outbreak from 4.4 to 0.8 assuming r¼0,only achieves 3.8 if it turns out that r¼40%.

关键词： Infectious disease model COVID-19 Pre-symptomatic Non-pharmaceutical intervention SIr model

Engineering heterogenous catalysts for chemical CO_(2) utilization:Lessons from thermal catalysis and advantages of yolk@shell structured nanoreactors

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Journal of Energy Chemistry 2021年第6期30卷 304-324,I0008页

作者： Cameron Alexander hurd Price tomas ramirez reina Jian Liu DICP-Surrey Joint Centre for Future Materials Department of Chemical and Process EngineeringUniversity of SurreyGuildfordSurrey GU27XHUK State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina

the development of catalytic materials for the recycling CO_(2) through a myriad of available processes is an attractive field,especially given the current climate *** there is increasing publication in this field,the reported catalysts rarely deviate from the traditionally supported metal nanoparticle morphology,with the most simplistic method of enhancement being the addition of more metals to an already complex *** catalysts,especially yolk@shell catalysts with hollow voids,offer answers to the most prominent issues faced by this field,coking and sintering,and further potential for more advanced phenomena,for example,the confinement effect,to promote selectivity or offer greater protection against coking and *** work serves to demonstrate the current position of catalyst development in the fields of thermal CO_(2) reforming and hydrogenation,summarizing the most recent work available and most common metals used for these reactions,and how yolk@shell catalysts can offer superior performance and survivability in thermal CO_(2) reforming and hydrogenation to the more traditional ***,this work will briefly demonstrate the bespoke nature and highly variable yolk@shell ***,this review aims to illuminate the spatial confinement effect and how it enhances yolk@shell structured nanoreactors is presented.

关键词： Yolk@shell CO_(2)utilization reforming Hydrogenation Confinement effect

Design of mesoporous ZnCoSiOx hollow nanoreactors with specific spatial distribution of metal species for selective CO_(2)hydrogenation

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Nano research 2023年第4期16卷 5601-5609页

作者： Xinyao Wang runping Ye Melis S.Duyar Cameron Alexander hurd Price Hao tian Yanping Chen Na ta Hao Liu Jian Liu State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China Department of Chemical and Process Engineering University of SurreyGuildfordSurrey GU27XHUK Department of Chemical Engineering and Analytical Science University of ManchesterManchesterUK Centre for Clean Energy technology University of Technology SydneySydneyBroadway NSW 2007Australia DICP-Surrey Joint Centre for Future Materials Advanced Technology InstituteUniversity of SurreyGuildfordSurrey GU27XHUK

In heterogeneous catalysis,the precise placement of active components to perform unique functions in cooperation with each other is a tremendous *** migration of matter on micro/nano-scale caused by diffusion is a promising pathway for design of catalytic nanoreactors with precise active sites location and controllable microenvironment through compartmentalization and confinement ***,we report two categories of mesoporous ZnCoSiOx hollow nanoreactors with different metal distributions and microenvironment engineered by the diffusion behavior of metal species in confined ***-shelled hollow structures with well-distributed metal species were obtained by adopting core@shell structured ZnCo-zeolitic imidazolate framework(ZIF)@SiO2 as a template and employing three stages of hydrothermal treatment including the decomposition of ZIF,diffusion of metal species into the silica shell,and Ostwald ***,the formation of yolk@shell structure with a collective(Zn-Co)metal oxide as the yolk was achieved by direct pyrolysis of ZnCo-ZIF@*** CO_(2)hydrogenation,ZnCoSiOx with double-shelled hollow structures and yolk@shell structures respectively afford CO and CH_(4)as main product,which is related with different dispersion and location of active sites in the two *** study provides an efficient method for the synthesis of catalytic nanoreactors on the basis of insights of the atomic diffusion in confined space at the mesoscale.

关键词： mesoporous materials structure-activity relationships supported catalysts metal-organic frameworks nanostructures

Ethanol steam reforming over Ni/ZSM-5 nanosheet for hydrogen production

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Chinese Journal of Chemical Engineering 2024年第3期67卷 247-256页

作者： Porapak Suriya Shanshan Xu Shengzhe Ding Sarayute Chansai Yilai Jiao Joseph hurd Daniel Lee Yuxin Zhang Christopher Hardacre Prasert reubroycharoen Xiaolei Fan Department of Chemical Engineering School of EngineeringThe University of ManchesterManchester M139PLUnited Kingdom Program of Petrochemistry and Polymer Science Faculty of ScienceChulalongkorn UniversityBangkok10330Thailand Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Liaoning Academy of Materials Shenyang 110167China Center of Excellence in Catalysis for Bioenergy and renewable Chemicals(CBrC) andDepartment of Chemical TechnologyFaculty of ScienceChulalongkorn UniversityBangkok 10330Thailand Nottingham Ningbo China Beacons of Excellence research and Innovation Institute University of Nottingham Ningbo ChinaNingbo315100China

Compared to reforming reactions using hydrocarbons,ethanol steam reforming(ESr)is a sustainable alternative for hydrogen(H_(2))production since ethanol can be produced sustainably using *** work explores the catalyst design strategies for preparing the Ni supported on ZSM-5 zeolite catalysts to promote ***,two-dimensional ZSM-5 nanosheet and conventional ZSM-5 crystal were used as the catalyst carriers and two synthesis strategies,i.e.,in situ encapsulation and wet impregnation method,were employed to prepare the *** on the comparative characterization of the catalysts and comparative catalytic assessments,it was found that the combination of the in situ encapsulation synthesis and the ZSM-5 nanosheet carrier was the effective strategy to develop catalysts for promoting H_(2) production via ESr due to the improved mass transfer(through the 2-D structure of ZSM-5 nanosheet)and formation of confined small Ni nanoparticles(resulted via the in situ encapsulation synthesis).In addition,the resulting ZSM-5 nanosheet supported Ni catalyst also showed high Ni dispersion and high accessibility to Ni sites by the reactants,being able to improve the activity and stability of catalysts and suppress metal sintering and coking during ESr at high reaction ***,the Ni supported on ZSM-5 nanosheet catalyst prepared by encapsulation showed the stable performance with~88% ethanol conversion and~65% H_(2) yield achieved during a 48-h longevity test at 550-C.

关键词： ZSM-5 nanosheet In situ encapsulation Ni catalyst Ethanol steam reforming Hydrogen production

repairing the injured spinal cord: sprouting versus regeneration. Is this a realistic match?

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Neural regeneration research 2014年第5期9卷 462-462页

作者： Karim Fouad Caitlin hurd Faculty of rehabilitation Medicine University of Alberta

the article by Meves and Zheng （2014） is addressing a continu- ous shift in the field of spinal cord injury （SCI） research that has occurred over the last century. Before that, the spinal cord was viewed as ＂hard wired＂ and treatment considerations were based on observations that axons in the periphery were able to regenerate, but those in the central nervous system （CNS） were not （David and Aguayo, 1981）.

关键词： this sprouting versus regeneration SCI repairing the injured spinal cord Is this a realistic match

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Good Night,Moon

阅读 2016年第84期 12-15页

作者： Margaret Wise Brown Clement hurd

小兔子要上床睡觉了,他向身边的每一样东西道晚安。时钟滴答滴答,从七点钟,一直到……当小兔子终于头挨在枕头上沉睡的时候,你猜猜时针已经指向了几点呢?小兔子睡前的依依不舍,为他身边的所有东西增添了玩伴一般的灵性。还有那只不起眼... 详细信息

小兔子要上床睡觉了,他向身边的每一样东西道晚安。时钟滴答滴答,从七点钟,一直到……当小兔子终于头挨在枕头上沉睡的时候,你猜猜时针已经指向了几点呢?小兔子睡前的依依不舍,为他身边的所有东西增添了玩伴一般的灵性。还有那只不起眼的小老鼠,你到绘本中找一找吧,看看在这样一段时间里,它又在做些什么?

关键词：小兔子 Good Night,Moon

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基本电磁学题解

基本电磁学题解

Clinical reproductive Medicine and Surgery 1 Har/Dvdr

1983年

作者： D.t.Paris F.K.hurd 黄而乐编译

是台南复文书局1983年版的影印本。

关键词：数理科学和化学物理学电磁学、电动力学

来源：汇雅图书（南通市图书馆... 评论

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Nano-synthesis and nano-mechanics of diamond composites and its petroleum drilling applications

2007年

作者： tommaso Falcone MD William hurd MD

来源：畅想之星图书光盘版（南... 评论

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化工新型材料 2010年第S1期38卷 18-18页

作者： Alan J. hurd LANSCE-Lujan Center Los Alamos National Laboratory

We perform synthesis, characterization, and application of nanostructured diamond composites. the enhancements of the thermomechanical performance of bulk diamond compacts in terms of hardness, fracture toughness, wear resistance, impact strength, and thermal stability are our project objectives. It is to aim at applying an advanced nanosynthesis process for the manufac-turing of superhard and ultratough diamond/SiC nanocomposites with the implementation of nanofiber reinforcement. the r&D re-sults can be used in multi-industrial applications, particularly, for drill bits designed to encounter dynamic impacts for high speed oil/gas drillings, thus to achieve high efficiency and energy saving. Science and technology (S&t) researches on precursors, cata-lyst, reactive sintering, and in-situ/real-time characterization of high P-t neutron/X-ray diffraction studies on phase stability, syn-thesis kinetics, residual strain, and yield strength have been applied to help optimizing the nanomanufacturing process. Our r&D ef-fort in high P-t nanosynthesis of tSP diamond/SiC composites is to achieve superior performance of nanomechanics in resisting dy-namic impact and thermal degradation, while still maintaining the super-hardness and super-abrasiveness of diamond and silicon-car-bide. the improved polycrystalline diamond compact (PDC) bit inserts for drilling, boring, and cutting will be applied in harsh envi-ronments so as to meet the demands of the mining, petroleum, and machinery industries. With success of the proposed project, the expected energy savings and reduction of CO2 emission will be significant and the economic advantages are going to be enormous.

关键词： Nano-synthesis and nano-mechanics of diamond composites and its petroleum drilling applications