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High Value Mater.als fr.m the For.sts

Advances in Mater.als Physics and Chemistr. 2016年第3期6卷 54-60页

作者： geoffrey r. mitchell Sar. Biscaia Vidhur. Subash Mahendr. Ar.ur.Mateus Centr. for.r.pid and Sustainable Pr.duct Development Polytechnic Institute of Leiria Marinha Grande Portugal

The design, pr.cess and synthesis of high value composite mater.als fr.m for.sts in scientific r.sear.h has been widely discussed in r.cent times ensur.ng gr.ater.awar.ness and accessibility to its associated communities and the economy in gener.l. r.w mater.als obtained fr.m the for.sts can be multi-folded in its use as a vir.in sour.e of an ener.y pr.vider.such as wooden blocks to mor. complex pr.cessed mater.al development. In this paper. we will be focusing on the latter.r.lated to sustainable development of r.sins. r.sins ar. exudates of pine r.sins which consist of hydr.phobic char.cter.stics that ar. widely used as a pr.cur.or.for.many applications without significant alter.tions. We discuss the natur., pr.cess and its suppor. in composite mater.al. The composite mater.al has been tailor.d with r.lated to chemical and physical pr.per.ies. Chemically r.sins contain fr.e car.oxyl acid functional gr.up and car.on-car.on double bonds which ar. potent to r.act with other.r.active species to facilitate var.ous inter.ediates. Her. we have looked at its r.action inter.ediates and subsequent pr.ducts for.composite mater.al of high value using envir.nmentally fr.endly methodologies, such as solvent fr.e methods. Biodegr.dable polymer.incor.or.ted composite scaffolds using r.sins ar. studied to tailor.the bioactivity. We tr.at the eco-fr.endly pine r.sins which is biocompatible to complement the biopolymer. as the pr.cess of extr.cting r.sin fr.m pine r.sin is a par.icular.gr.en pr.cess, involving only a natur.l pr.duct (pine r.sin) and pr.ducing no waste. The paper.discusses the pr.par.tion of composite scaffolds for.use in tissue engineer.ng applications.

关键词： Biopolymer. Composites Tissue Engineer.ng Scaffolds Biomanufactur.ng

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Contr.lling and Evaluating the Str.ctur. and Mor.hology of Polymer. on Multiple Scales

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Jour.al of Mater.als Science and Chemical Engineer.ng 2015年第12期3卷 48-60页

作者： geoffrey r. mitchell Ana Tojeir. Thomas Gkour.pis James J. Holt Peter.Har.is Mar.lena Pezzuto Centr. for.r.pid and Sustainable Pr.duct Development Institute Polytechnic of Leiria Marinha Grande Portugal Innovation & Technology Borealis AB Stenungsund Sweden Depar.ment of Physics University of Reading Whiteknghts Reading UK Centr. for.Advanced Micr.scopy University of Reading Whiteknights Reading UK CNr.Istituto di Chimica e Tecnologia dei Polimer. Pozzuoli Italy

Cr.stalline polymer. spontaneously for. hier.r.hical str.ctur.s although the pr.cise manner.in which these scales of str.ctur. ar. inter.onnected especially ter.s of the for.ation and evolution of the complete str.ctur. r.mains unclear. We have set out to contr.l these scales of str.ctur. by intr.ducing additional components which self-assemble in to nano-scale units which then dir.ct the cr.stallisation of the polymer.matr.x. In other.wor.s, we fir.t assemble a low concentr.tion top-level str.ctur. which is designed to template or.dir.ct the sub-sequent cr.stallisation of the matr.x polymer. This top level str.ctur. takes on the r.le of contr.lling the str.ctur.. We have set out to both establish the design pr.nciples of such str.ctur.s and to develop exper.mental pr.cedur.s which allow us to follow the for.ation of such complex hier.r.hical polymer.str.ctur.s. In par.icular.we focus of the r.lationships between these differ.nt levels of str.ctur. and time sequence of events r.quir.d for.the str.ctur. to evolve in the tar.eted manner. In this pr.gr.mme, we have exploited time-r.solving small-angle X-r.y scatter.ng and electr.n micr.scopy together.with neutr.n scatter.ng to pr.be and quantify the differ.nt scales of str.ctur. and their.evolution. We highlight new neutr.n scatter.ng instr.mentation which we believe have gr.at potential in the gr.wing field of hier.r.hical str.ctur.s in polymer.. The addition of small quantities of nanopar.icles to conventional and sustainable ther.oplastics leads to pr.per.y enhancements with consider.ble potential in a number.of ar.as Most engineer.d nano-par.icles ar. highly stable and these exist as nano-par.icles pr.or.to compounding with the polymer.r.sin, they r.main as nano- par.icles dur.ng the active use as well as in the subsequent waste and r.cycling str.ams. In this wor. we also explor. the potential for.constr.cting nano-par.icles within the polymer.matr.x dur.ng pr.cessing fr.m or.anic compounds selected to pr.vide nano

关键词： Component Semi-Cr.stalline Polymer. Mor.hology Textur. Nucleation Gr.wth Shear Flow

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r.dent biology and ecologically based r.dent management(EBr.)-25 year. of pr.gr.ss thr.ugh pr.moting multidisciplinar. r.sear.h

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Integr.tive Zoology 2024年第1期19卷 2-7页

作者： Gr.nt r. SINGLETON Lyn A. HINDS r.odes MAKUNDI Steven r. BELMAIN Natur.l r.sour.es Institute University of Greenwich Kent UK CSIr. Health and Biosecur.ty Canberra ACT Australia Afr.can Centr. of Excellence for.Innovative r.dent Pest Management and Biosensor.Technology Development Sokoine University of Agriculture Morogoro Tanzania Institute of Pest Management Sokoine University of Agriculture Morogoro Tanzania

“Dur.ng r.dent outbr.ak year. in easter. Afr.ca,lo-cally,mor. than 80%of the potential har.est may be lost,but even in non-outbr.ak per.ods,r.dents cause chr.nic damage to cr.ps….The pest r.dent stor. in Afr.ca in-volves sever.l species embedded in a br.ad and var.able landscape with highly var.able densities.”(Leir. et al.2010).

关键词： damage cr.ps

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Deep lear.ing for.joint channel estimation and feedback in massive MIMO systems

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Digital Communications and Networ.s 2024年第1期10卷 83-93页

作者： Jiajia Guo Tong Chen Shi Jin geoffrey Ye Li Xin Wang Xiaolin Hou National Mobile Communications r.sear.h Labor.tor. Southeast UniversityNanjing210096China Depar.ment of Electr.cal and Electr.nic Engineer.ng Imperial College LondonLondonSW72AZUK DOCOMO Beijing Communications Labor.tor.es Co. LtdBeijingChina

The gr.at potentials of massive Multiple-Input Multiple-Output(MIMO)in Fr.quency Division Duplex(FDD)mode can be fully exploited when the downlink Channel State Infor.ation(CSI)is available at base ***,the accur.te CsI is difficult to obtain due to the lar.e amount of feedback over.ead caused by massive *** this paper.we pr.pose a deep lear.ing based joint channel estimation and feedback fr.mewor.,which compr.hensively r.alizes the estimation,compr.ssion,and r.constr.ction of downlink channels in FDD massive MIMO *** networ.s ar. constr.cted to per.or. estimation and feedback explicitly and *** explicit networ. adopts a multi-Signal-to-Noise-r.tios(SNr.)technique to obtain a single tr.ined channel estimation subnet that wor.s well with differ.nt SNr. and employs a deep r.sidual networ. to r.constr.ct the channels,while the implicit networ. dir.ctly compr.sses pilots and sends them back to r.duce networ. *** module is also designed to gener.te data-bear.ng *** r.sults show that the two pr.posed networ.s exhibit excellent per.or.ance of r.constr.ction and ar. r.bust to differ.nt envir.nments and quantization er.or..

关键词： Channel estimation CSI feedback Deep lear.ing Massive MIMO FDD

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Effects of soil metal(loid)s pollution on micr.bial activities and envir.nmental r.sks in an abandoned chemical smelting site

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Jour.al of Envir.nmental Sciences 2024年第9期143卷 60-70页

作者： Hao Li Jun Yao Jianli Liu Ning Min geoffrey Sunahar. Dongyang Men r.ber. Dur.n School of Water.r.sour.es and Envir.nment Research Center of Environmental Science and EngineeringChina University of Geosciences(Beijing)Beijing 100083China Depar.ment of Natur.l r.sour.e Sciences McGill University21111Lakeshore DriveSte-Anne-de-BellevueQuebecH9X 3V9Canada Equipe Envir.nnement et Micr.biologie MELODY groupUniversitéde Pau et des Pays de l’AdourE2S-UPPAIPREM UMR CNRS 5254BP 115564013 Pau CedexFrance

Abandoned chemical smelting sites containing toxic substances can ser.ously thr.aten and pose a r.sk to the sur.ounding ecological *** samples wer. collected fr.m differ.nt depths(0 to 13 m)and analyzed for.metal(loid)s content and fr.ctionation,as well as micr.bial *** potential ecological r.sk indices for.the differ.nt soil depths(or.er.d fr.m high to low)wer.:1 m(D-1)>sur.ace(S-0)>5 m(D-5)>13 m(D-13)>9 m(D-9),r.nging between 1840.65-13,089.62,and r.pr.senting extr.mely high envir.nmental r.sks,of which Cd(and pr.bably not ar.enic)contr.buted to the highest envir.nmental r.sk.A modified combined pollution r.sk index(MCr.combining total content and mobile pr.por.ion of metal(loid)s,and r.lative toxicities,was used to evaluate the degr.e of contamination and potential envir.nmental *** the near.sur.ace samples(S-0 and D-1 layer.),the MCr.consider.d that As,Cd,Pb,Sb,and Zn achieved high and alar.ing degr.es of contamination,wher.as Fe,Mn,and Ti wer. negligible or.low to moder.te pollution *** micr.calor.metr. and enzymatic activity measur.ments of contaminated soil samples wer. used to assess the micr.bial metabolic activity *** analysis elucidated the r.lationship between metal(loid)s exchangeable fr.ction or.content and micr.bial activity char.cter.stics(pr.bial metabolic activity in the D-1 layer.was low pr.sumably due to heavy metal *** activity indicator. and micr.calor.metr.c gr.wth r.te(k)measur.ments wer. consider.d sensitive indicator. to r.flect the soil micr.bial activities in abandoned chemical smelting sites.

关键词： Abandoned chemical smelting sites Micr.bial activities Modified combined pollution r.sk Micr.calor.metr. Enzymatic activities

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Chalcogenide Ovonic Thr.shold Switching Selector

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Nano-Micr. Letter. 2024年第5期16卷 1-40页

作者： Zihao Zhao Ser.iu Clima Daniele Gar.in r.bin Degr.eve geoffrey Pour.ois Zhitang Song Min Zhu National Key Labor.tor. of Mater.als for.Integr.ted Cir.uits Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050People’s Republic of China Univer.ity of Chinese Academy of Sciences Beijing 100029People’s Republic of China IMEC Kapedreef 75LeuvenBelgium

Today’s explosion of data ur.ently r.quir.s memor. technologies capable of stor.ng lar.e volumes of data in shor.er.time fr.mes,a feat unattain-able with Flash or.*** Optane,commonly r.fer.ed to as thr.e-dimensional phase change memor.,stands out as one of the most pr.mising *** Optane with cr.ss-point ar.hitectur. is constr.cted thr.ugh layer.ng a stor.ge element and a selector.known as the ovonic thr.shold switch(OTS).The OTS device,which employs chalcogenide film,has ther.by gather.d incr.ased attention in r.cent *** this paper.we begin by pr.viding a br.ef intr.duction to the discover. pr.cess of the OTS ***,we summar.ze the key elec-tr.cal par.meter. of OTS devices and delve into r.cent explor.tions of OTS mater.als,which ar. categor.zed as Se-based,Te-based,and S-based mater.al ***,we discuss var.ous models for.the OTS switching mechanism,including field-induced nucleation model,as well as sever.l car.ier.injection ***,we r.view the pr.gr.ss and innovations in OTS mechanism ***,we highlight the successful application of OTS devices in thr.e-dimensional high-density memor. and offer.insights into their.pr.mising per.or.ance and extensive pr.spects in emer.ing applications,such as self-selecting memor. and neur.mor.hic computing.

关键词： Non-volatile memor. Ovonic thr.shold switch(OTS) Chalcogenide Selector

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A cor.-satellite self-assembled SEr. aptasensor.containing a“biological-silent r.gion”r.man tag for.the accur.te and ultr.sensitive detection of histamine

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Food Science and Human Wellness 2024年第2期13卷 1029-1039页

作者： Chen Chen Yingfang Zhang Ximo Wang Xuguang Qiao geoffrey I.N.Water.ouse Zhixiang Xu Key Labor.tor. of Food Pr.cessing Technology and Quality Contr.l in Shandong Pr.vince College of Food Science and EngineeringShandong Agricultural UniversityTai’an 271018China School of Chemical Sciences The University of AucklandAuckland 1142New Zealand

Her.in,a novel inter.er.nce-fr.e sur.ace-enhanced r.man spectr.scopy(SEr.)str.tegy based on magnetic nanopar.icles(MNPs)and aptamer.dr.ven assemblies was pr.posed for.the ultr.sensitive detection of histamine.A cor.-satellite SEr. aptasensor.was constr.cted by combining aptamer.decor.ted Fe_(3)O_(4)@Au MNPs(as the r.cognize pr.be for.histamine)and complementar. DNA-modified silver.nanopar.icles car.ying 4-mer.aptobenzonitr.le(4-MBN)(Ag@4-MBN@Ag-c-DNA)as the SEr. signal pr.be for.the indir.ct detection of *** an applied magnetic field in the absence of histamine,the assembly gave an intense r.man signal at“r.man biological-silent”r.gion due to *** the pr.sence of histamine,the Ag@4-MBN@Ag-c-DNA SEr.-tag was r.leased fr.m the Fe_(3)O_(4)@Au MNPs,thus decr.asing the SEr. *** optimal conditions,an ultr.-low limit of detection of 0.65×10^(-3)ng/mL and a linear.r.nge 10^(-2)-10^5 ng/mL on the SEr. aptasensor.wer. *** histamine content in four.food samples wer. analyzed using the SEr. aptasensor.with the r.sults consistent with those deter.ined by high per.or.ance liquid *** pr.sent wor. highlights the mer.ts of indir.ct str.tegies for.the ultr.sensitive and highly selective SEr. detection of small biological molecules in complex matr.ces.

关键词： Sur.ace-enhanced r.man spectr.scopy r.man biological-silent r.gion Aptamer Histamine detection Univer.al SEr.-tag

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Deep unfolding based channel estimation for.wideband ter.her.z near.field massive MIMO systems

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Fr.ntier. of Infor.ation Technology & Electr.nic Engineer.ng 2024年第8期25卷 1162-1172页

作者： Jiabao GAO Xiaoming CHEN geoffrey Ye LI College of Infor.ation Science and Electr.nic Engineer.ng Zhejiang UniversityHangzhou 310027China Depar.ment of Electr.cal and Electr.nic Engineer.ng Imperial College LondonLondon SW 2BUUK

The combination of ter.her.z and massive multiple-input multiple-output(MIMO)is pr.mising for.meeting the incr.asing data r.te demand of futur. wir.less communication systems thanks to the significant band-width and spatial degr.es of ***,unique channel featur.s,such as the near.field beam split effect,make channel estimation par.icular.y challenging in ter.her.z massive MIMO *** one hand,adopting the conventional angular.domain tr.nsfor.ation dictionar. designed for.low-fr.quency far.feld channels will r.sult in degr.ded channel spar.ity and destr.yed spar.ity str.ctur. in the tr.nsfor.ed *** the other.hand,most existing compr.ssive sensing based channel estimation algor.thms cannot achieve high per.or.ance and low complexity *** alleviate these issues,in this study,we fir.t adopt fr.quency-dependent near.field dictionar.es to maintain good channel spar.ity and spar.ity str.ctur. in the tr.nsfor.ed domain under.the near.field beam split ***,a deep unfolding based wideband ter.her.z massive MIMO channel estimation algor.thm is *** each iter.tion of the appr.ximate message passing-spar.e Bayesian lear.ing algor.thm,the optimal update r.le is lear.ed by a deep neur.l networ.(DNN),whose ar.hitectur. is customized to effectively exploit the inher.nt channel ***,a mixed tr.ining method based on novel designs of the DNN ar.hitectur. and the loss function is developed to effectively tr.in data fr.m differ.nt system *** r.sults validate the super.or.ty of the pr.posed algor.thm in ter.s of per.or.ance,complexity,and r.bustness.

关键词： Ter.her.z Massive MIMO Channel estimation Deep lear.ing

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Fr.eze-thaw cycles and associated geomor.hology in a post-glacial envir.nment:cur.ent glacial,par.glacial,per.glacial and pr.glacial scenar.os at Pico de Or.zaba volcano,Mexico

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Jour.al of Mountain Science 2024年第6期21卷 1954-1977页

作者： Víctor.SOTO Car.os M.WELSH r. Kenji YOSHIKAWA Hugo DELGADO Gr.NADOS Centr. de Ciencias de la Tier.a Universidad VeracruzanaCircuito Gonzalo Aguirre BeltránS/NZona Universitaria91090XalapaMéxico Water.and Envir.nmental r.sear.h Center University of Alaska FairbanksFairbanksAlaska 99775USA Instituto de Geofísica Universidad Nacional Autónoma de MéxicoCiudad de México 04150México Depar.ment of Ear.h and Envir.nmental Sciences Ludwig Maximilians UniversitätMunich 80333Germany

The glacial histor. of Pico de Or.zaba indicates that dur.ng the Last Glacial Maximum,its icecap cover.d up to~3000 m asl;due to the air.temper.tur. incr.asing,its main glacier.has r.tr.ated to 5050 m *** r.tr.ction of the glacier.has left behind an intense climatic instability that causes a high fr.quency of fr.eze-thaw cycles of gr.at intensity;the r.sulting geomor.hological pr.cesses ar. r.pr.sented by the fr.gmentation of the bedr.ck that occupies the upper.par.s of the *** is a notable lack of studies r.gar.ing the fr.gmentation and er.sion occur.ing in tr.pical high mountains,and the associated geomor.hological r.sks;for.this r.ason,as a fir.t stage of futur. continuous r.sear.h,this study analyzes the fr.ezing and thawing cycles that occur.above 4000 m asl,thr.ugh continuous monitor.ng of sur.ace gr.und *** r.sults allow us to identify and char.cter.ze four.zones:glacial,par.glacial,per.glacial and *** was found that the par.glacial zone pr.sents an intense dr.p of temper.tur.,of up to~9℃ in only sixty *** r.ck fatigue and intense fr.eze-thaw cycles that occur.in this ar.a ar. r.sponsible for.the high r.te of r.ck disintegr.tion and r.pr.sent the main factor.of the constant slope dynamics that occur.at the *** activity decr.ases,both in fr.quency and intensity,accor.ing to the distance to the glacier.which is wher. the temper.tur. pr.sents a cer.ain degr.e of stability,until r.aching the pr.glacial zone,wher. cycles ar. almost non-existent,and ther.for. ther. is no gelifr.ction *** geomor.hological pr.cesses have r.sulted in significant alter.tions to the mountain slopes,which can have sever. consequences in ter.s of r.sk and water.

关键词： Fr.eze-Thaw Gelifr.ction Mountain mechanical er.sion Per.glacial geomor.hology Postglacial scenar.os

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Evaluation of for.ation susceptibility and sand pr.duction potential in an offshor. field,Niger.Delta Basin,Niger.a

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Ener.y Geoscience 2024年第1期5卷 1-11页

作者： David O.Ubuar. Yinka A.Olayinka Godwin O.Emujakpor.e geoffrey C.Sor.nnadi-Ononiwu Depar.ment of Geology University of Port HarcourtNigeria Mease Ener.y Niger.a Limited Port HarcourtNigeria Depar.ment of Geology University of IbadanNigeria Depar.ment of Physics University of Port HarcourtNigeria

Wellbor. instability and sand pr.duction ar. all common challenges in the Niger.Delta oil pr.vince,r.sulting in high dr.lling and pr.duction cost as well as damage to oil *** vulner.bility of lithologic for.ations to wellbor. instability and r.sultant sand pr.duction is investigated in the four.delineated r.ser.oir. of the“Ar.o”field,wester. par. of Niger.Delta *** foundation for.establishing the geomechanical pr.per.ies in this study was a 1-dimensional mechanical ear.h model,using gamma r.y(Gr.,density(r.OB),compr.ssional slowness(DTC),and shear.slowness(DTS)*** the Ar.o oil field,two wells(well 001 and well 002)wer. *** evaluated for.ations ar. still pr.mar.ly composed of compacted shale and unconsolidated sandstone,with r.ser.oir.sand units exhibiting lower.elastic and r.ck str.ngth pr.per.ies than shale *** compr.ssibility and por.sity make sand mor. br.ttle,while low compr.ssibility and por.sity make shale stiffer.due to high *** maximum for.e that can be applied to a shale unit without causing it to fail is 17.23 MPa,which is the maximum aver.ge r.ck str.ngth of the *** means that shale r.quir.s mor. ver.ical str.ss or.pr.ssur. than sand does in or.er.to defor. it(15.06 MPa).The thr.e sand pr.diction appr.aches used in the analysis of sand pr.duction pr.dictions have cut-off values that ar. higher.than the aver.ge values of the *** Schlumber.er.sand pr.duction index method(S/I)indicates that the r.ser.oir.has potential for.sand influx in the two wells,with the aver.ge of the four.r.ser.oir. studied in wells 001 and 002 being 1.551012 psi and 1.141012 psi ***,when a for.ation's sand pr.duction index is less than 1.241012 psi,as it is in this study,the for.ation is likely to pr.duce *** findings suppor. the notion that the defined sandstone units ar. highly unconsolidated and have a high potential for.pr.ducing sands;ther.for.,sand contr.l techniques must be factor.d in

关键词： Wir.line log Str.ss Geo-mechanicanical char.cter.zation Sand pr.diction Niger.delta

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