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粉末冶金Al-5.6Zn-2Mg合金在热压缩过程中加工硬化特性及本构模型的比较

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Jour.al of Centr.l South Univer.ity 2024年第2期31卷 346-368页

作者： KATIKA Har.kr.shna DAMODA r.K. DAVIDSON M.J. SEETHAr.M r. KASAGANI Veer. Venkata Nagar.ju Depar.ment of Mechanical Engineer.ng National Institute of TechnologyWarangal 506004India Depar.ment of Mechanical Engineer.ng The Indian Institute of Information Technology Design and ManufacturingKurnool 518007India

在300~5000℃、应变速率为0.1~0.0001 s−1的条件下,在万能试验机上对Al-5.6Zn-2Mg铝合金进行热压缩试验,以确定动态再结晶开始时的加工硬化速率曲线σ_(c)(ε_(c))l以及关键特征σ_(c)(ε_(c))l、σ_(p)(ε_(p))和σ_(ss)与Z系数之间的... 详细信息

在300~5000℃、应变速率为0.1~0.0001 s−1的条件下,在万能试验机上对Al-5.6Zn-2Mg铝合金进行热压缩试验,以确定动态再结晶开始时的加工硬化速率曲线σ_(c)(ε_(c))l以及关键特征σ_(c)(ε_(c))l、σ_(p)(ε_(p))和σ_(ss)与Z系数之间的相关性。使用了四个本构模型,Ar.henius模型、改进的Johnson-Cook模型(MJC)、改进的Zer.lli-Ar.str.ng模型(MZA)和开发的人工神经网络(ANN)。结果表明,ANN型模型和Ar.henius模型的相对误差的绝对平均值最低,分别为0.486%和3.36%,MZA型模型和MJC型模型的相对误差的绝对平均值较高,分别为8.84%和3.93%。由于Ar.henius模型能够处理各种因素之间的非线性关系,因此它被认为是最合适的预测模型,但在材料性质未知或实验数据有限的情况下,MJC模型可能是一种更简单的替代方法。MZA模型不适合估计热压缩时的流变应力。此外,训练最好的神经网络模型的预测性能最好,相对误差的绝对平均值为0.486%,r.为0.99。

关键词：加工硬化速率曲线本构建模热压缩 EBSD分析流变曲线

Analysis and Optimization of Oper.tional and Pollutant Attr.butes of Diesel Engine with CNT-Infused Or.nge Peel Biodiesel-Diesel Blend Fuel

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Jour.al of Ther.al Science 2024年第2期33卷 761-778页

作者： r.njeet r.I r.r.SAHOO Mechanical Engineer.ng Depar.ment GLA UniversityMathura281406India Mechanical Engineer.ng Depar.ment IIT(BHU)Varanasi221005India

The cur.ent study is per.or.ed to find sustainable solutions for.the futur. of tr.nspor.ation and envir.nmental *** conventional methods and exper.mental design table(L16 Or.hogonal Ar.ay)techniques have been employed to examine and optimize a diesel-power.d engine's oper.tional and pollutant *** L16 Or.hogonal Ar.ay is obtained thr.ugh Taguchi's exper.mental design appr.ach using Minitab 16 *** exper.mental design incor.or.ted thr.e contr.l var.ables,namely engine speed,fuel type,and engine load,each with four.*** oper.tional par.meter.,namely br.ke ther.al efficiency(BTE)and br.ke specific fuel consumption(BSFC),as well as the emission char.cter.stics,including hydr.car.on(HC),car.on monoxide(CO),nitr.gen oxide(NO),and smoke emissions,wer. acquir.d using the L16 or.hogonal ar.ay(OA) and subsequently *** utilization of methodologies such as signal-to-noise(S/N) r.tio and gr.y analysis was employed to deter.ine the optimal oper.tional state of the engine to achieve maximum per.or.ance while minimizing *** engine's ideal state of oper.tion,in ter.s of BTE and BSFC,was deter.ined to be at 75% engine load,1000 r.min engine speed,and using 10^(-4)(in vol) car.on nanotube incor.or.ted 20% or.nge peel biodiesel(OPB20CNT100) blended fuel(A3-B1-C4).The study indicated that engine load significantly influenced BTE and BSFC,with 84.05% and 87.79% contr.bution factor.,*** 25% engine load,1000 r.min,and OPB20CNT100 fuel(A1-B1-C4) CO,smoke,NO,and HC emissions wer. the *** load affects emissions the *** BSFC incr.ased 3.10% and NO emissions 1.77%.BTE,CO,smoke,and HC emissions decr.ased by 1.9%,12.29%,47.05%,and 47.22%,r.spectively,at optimal oper.ting conditions concer.ing diesel *** study shows that Taguchi-Gr.y's exper.mental design optimizes diesel engine oper.tional and pollutant *** outcomes r.vealed that or.nge peel biodiesel infused with CNT can r.place diesel fuel in a

关键词： Taguchi-Gr.y method OPB20CNT100 tr.nsester.fication S/N r.tio Gr. HC CO and NO

Stor.lines of family medicine Ⅲ:cor. pr.nciples—pr.mar. car.,systems and family

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Family Medicine and Community Health 2024年第S3期12卷 23-32页

作者： William B Ventr.s Leslie A Stone Timothy A Joslin John W Saultz Sommer.Aldulaimi Paul r.Gor.on John C Lane Er.c r.Lee jacob Pr.nuske Limor.Gildenblatt Michael H Fr.edman Colleen T Fogar.y Susan H McDaniel Tessa r.hr.er. Amy Odom Family and Pr.ventive Medicine University of Arkansas for Medical Sciences College of MedicineLittle RockArkansasUSA Family Medicine Oregon Health&Science UniversityPortlandOregonUSA Family and Community Medicine University of Arizona Medical Center–South CampusTucsonArizonaUSA Family and Community Medicine University of Arizona Medical Center–University CampusTucsonArizonaUSA UAMS West r.gional Campus Family Medicine r.sidency Pr.gr.m Fort SmithArkansasUSA Medical College of Wisconsin–Centr.l Wisconsin Campus WausauWisconsinUSA Family and Community Medicine Medical College of Wisconsin–Central Wisconsin CampusWausauWisconsinUSA Family Medicine Advocate Illinois Masonic Medical CenterChicagoIllinoisUSA Family Medicine Presence Saints Mary and Elizabeth Medical CenterChicagoIllinoisUSA Family Medicine University of Rochester Medical CenterRochesterNew YorkUSA Psychiatr. and Family Medicine University of Rochester Medical CenterRochesterNew YorkUSA Family and Community Medicine University of Kansas School of Medicine-WichitaWichitaKansasUSA Spar.ow/Michigan State Univer.ity Family Medicine r.sidency Pr.gr.m LansingMichiganUSA

Stor.lines of Family Medicine is a 12-par. ser.es of thematically linked mini-essays with accompanying illustr.tions that explor. the many dimensions of family medicine,as inter.r.ted by individual family physicians and medical educator. in the USA and elsewher. ar.und the ***‘Ⅲ:cor. pr.nciples—pr.mar. car.,systems,and family’,author. addr.ss the following themes:‘Continuity of car.—building ther.peutic r.lationships over.time’,‘Compr.hensiveness—combining br.adth and depth of scope’,‘Coor.ination of car.—managing multiple r.alities’,‘Access to car.—inter.ectional,systemic,and per.onal’,‘Systems theor.—a cor. value in patient-center.d car.’,‘Family-or.ented pr.ctice—suppor.ing patients’health and well-being’,‘Family physician as family member.and‘Family in the exam r.om’.May r.ader. develop new under.tandings fr.m these essays.

关键词： individual Stor.line pr.nciples

Paleoenvir.nmental changes r.cor.ed by gr.in size of loess/paleosol sequence fr.m the Chifeng City,Nor.heaster. China since the Last Glacial

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Jour.al of Mountain Science 2024年第9期21卷 3068-3082页

作者： LI Juan Br.E Kr.stofor.r.ZHANG Mengge JIANG Zhuodong WANG Qiubing College of Land and Envir.nment Shenyang Agricultural UniversityShenyang 110866China Depar.ment of Cr.p Soiland Environmental SciencesUniversity of ArkansasFayettevilleAR 72701USA

The accumulation pr.cesses of loess in nor.heaster.(NE)China r.cor. the var.ing char.cter.stics of the East Asian Monsoons(EAM)and the evolution of the local *** this study,gr.in size end-member.analysis of the Dajiugang(DJG)section deposited since the Last Glacial in Chifeng City,NE China was used to r.veal the dynamic depositional char.cter.stics of loess and envir.nmental evolution of NE *** showed that the Chifeng loess compr.ses thr.e gr.in size end-member.(EM),EM1(7.38μm),EM2(49.4μm)and EM3(90.00μm),indicating the thr.e tr.nspor. dynamics of dust deliver.d to the *** EM1 r.pr.sents atmospher.c dust as the *** EM2,mainly der.ved fr.m r.latively distant-sour.es deposition,and EM3,mater.al tr.nspor.ed over.a shor. distance,cor.espond to the intensity of southwester.y winds and the East Asian Winter.Monsoon(EAWM),*** of climate r.constr.ction,combined with other.r.cor.s,showed that the climate was gener.lly cold and dr. with a str.ng EAWM and a weak East Asian summer.monsoon(EASM)dur.ng the stadial-per.od[Mar.ne Isotope Stage(MIS)4 and MIS 2 stage].The climate was pr.dominantly war. and humid,with weak EAWM and sur.ace winds and str.ng EASM in inter.tadial-per.od(MIS 3 and MIS 1 stage).Compar.sons between indicator.,e.g.,EM3,the Lr.4 benthicδ18O stack and summer.insolation at 65°N suggest that the str.ng EAWM is induced by incr.asing the Nor.her. Hemispher. ice volume and r.duced summer.solar.r.diation.

关键词： Loess deposit Gr.in size end-member Nor.heaster. China Envir.nmental change The Last Glacial

Cr.ation and validation of a novel low-cost dr. lab for.ear.y r.sident tr.ining and assessment of r.botic pr.statectomy technical pr.ficiency

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Cur.ent Ur.logy 2024年第2期18卷 133-138页

作者： Kevin Kunitsky Abhishek Venkatar.mana Kather.ne E.Fer. Jor.e Ballon jacob Komber. r.ber. r.iter.Wayne Br.sbane Institute of Ur.logic Oncology Department of UrologyDavid Geffen School of MedicineUniversity of CaliforniaLos AngelesCAUSA Char.es E.Schmidt College of Medicine Florida Atlantic UniversityBoca RatonFLUSA

Pur.ose:To evaluate the pr.liminar. validity and acceptability of a low-cost low-fidelity r.botic sur.er. dr. lab for.tr.ining and assessing r.sidents’technical pr.ficiency with key r.botic r.dical pr.statectomy *** and methods:Thr.e standar.ized inanimate tasks wer. cr.ated to simulate the r.dical pr.statectomy steps of poster.or.dissection,neur.vascular.bundle r.lease,and ur.thr.vesical *** tr.inees and faculty at a single institution completed and evaluated each dr. lab *** validity was evaluated by compar.ng task completion times and Global Evaluative Assessment of r.botic Skills scor.s acr.ss four.par.icipant cohor.s:medical students(n=5),junior.r.sidents(n=5),senior.r.sidents(n=5),and attending sur.eons(n=7).Content validity,face validity,and acceptabilitywer. evaluated thr.ugh a posttask sur.ey using a 5-point Liker. ***:Ther. was a significant differ.nce in the individual and composite task completion times and Global Evaluative Assessment of r.botic Skills scor.s acr.ss all par.icipant cohor.s(all pr.ted favor.bly in ter.s of its content validity and acceptability for.use in r.sidency ***,model r.alism,compar.d with human tissue,was poor.y *** dr. lab pr.duction cost was less than US$***:This low-cost pr.cedur.-specific dr. lab demonstr.ted evidence of content validity,constr.ct validity,and acceptability for.simulating key r.botic pr.statectomy technical steps and can be used to augment r.bot-assisted lapar.scopic pr.statectomy sur.ical tr.ining.

关键词： r.botic sur.er. education r.dical pr.statectomy Simulation Dr. labor.tor. Validation

Impr.vement in Patient Mobility Following Shor.-Ter. r.habilitation in Skilled Nur.ing Facilities

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Open Jour.al of Ther.py and r.habilitation 2024年第1期12卷 52-60页

作者： Sean r. Silver.Jaden A. Silver Samueli School of Engineer.ng University of California Los Angeles USA

Backgr.und: Mobility in older.adults can be impair.d after.acute illness or.hospitalization, and the level of sever.ty can be used as a pr.dictor.of one’s ability to r.tur. to independent living. Patients ar. often r.fer.ed to skilled nur.ing facilities in hopes of impr.ving their.mobility. We wanted to pr.ve that r.habilitative ser.ices at Skilled Nur.ing Facilities impr.ve over.ll outcomes. Methods: We conducted a r.tr.spective analysis of data fr.m 4612 patients admitted for.shor.-ter. r.habilitation in a lar.e nur.ing home chain in Califor.ia. Our.aim was to deter.ine whether.patients’ mobility scor.s, as measur.d by r.habilitative staff, significantly impr.ved by time of dischar.e compar.d to their.scor.s at admission. Mobility scor.s wer. r.ted fr.m 1 to 6, with 1 being the most dependent on aid and 6 being the most independent, over.a var.ety of tasks at admission and compar.d to scor.s at dischar.e. Pear.on’s cor.elations wer. per.or.ed to deter.ine if ther. wer. significant r.lationships in the data: the Pear.on’s cor.elation coefficient was used to descr.be the r.lationships between patient admission to a skilled nur.ing facility and medical impr.vement upon dischar.e. r.sults: The study demonstr.ted a statistically significant impr.vement in patients’ mobility scor.s upon dischar.e, with Medicar. insur.d patients showing on aver.ge 57% impr.vement and Managed Car. insur.d patients showing on aver.ge 59% impr.vement. Additionally, admission scor.s appear.d to be pr.dictive of the patient’s outcome at dischar.e. Conclusions: The values and consistency of impr.vement suppor. the use of acute r.habilitative ser.ices in skilled nur.ing facilities. An equation can be for.ulated that evaluates patients’ estimated mobility statuses upon dischar.e fr.m facilities based on their.conditions on their.ar.ivals. With this, new inter.entions can be studied and compar.d to the cur.ent standar. of car. by using these measur.ments. They can deter.ine if fur.her.impr.vement

关键词： Mobility Skilled Nur.ing Facility r.habilitative Ser.ices Independent Living Healthcar.

Impr.vement of Activities of Daily Living (ADL) for.Patients Tr.ated in Skilled Nur.ing Facilities (SNFs)

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Open Jour.al of Ther.py and r.habilitation 2024年第1期12卷 61-69页

作者： Jaden A. Silver.Sean r. Silver Samueli School of Engineer.ng University of California Los Angeles USA

Backgr.und: Self-car. tasks or.activities of daily living (ADL)’s per.or.ance ar. often disr.pted after.an older.adult sustains an injur. or.illness, which can be a deter.ining factor.for.dischar.e placement after.hospitalization, or.it can deter.ine the level of assistance r.quir.d after.dischar.e fr.m a skilled nur.ing facility (SNF). We believe that compr.hensive r.habilitation can impr.ve a patient’s over.ll functioning dur.ng their.shor. ter. stay in SNFs. The pur.ose of this study is to deter.ine if an individual’s level of independence impr.ved after.admission to a skilled nur.ing facility and pr.cur.ment of r.habilitation ser.ices. Methods: This study r.tr.spectively r.viewed 4612 nur.ing home patients in Califor.ia who under.ent r.habilitative ser.ices at skilled nur.ing facilities to deter.ine how the patients r.sponded to their.envir.nments, ther.py inter.entions, and any other.additional suppor.ive measur.s. The r.cor.s of patients who wer. admitted for.shor.-ter. r.habilitation wer. r.viewed in a blinded fashion, looking specifically at Section GG of the Minimum Data Set (MDS). Self-Car. Section GG scor.s r.cor.ed by r.habilitative staff pr.vide objective data and measur. patients’ levels of assistance that wer. r.quir.d. Each activity is scor.d fr.m 1, being completely dependent, to 6, being entir.ly independent, with var.ing levels of assistance with scor.s in between. The admission scor.s ver.us the dischar.e scor.s can be compar.d to deter.ine if a patient impr.ved their.level of functioning upon dischar.e. r.sults: Utilizing the Pear.on’s cor.elation coefficient, a str.ng cor.elation of impr.vement in ADL per.or.ance on Section GG between the admission and dischar.e scor.s was identified, implying significant impr.vement in functional independence upon dischar.e. The aver.ge per.ent impr.vement for.Managed Car. patients was ~35.4% and ~39.4% for.Medicar. patients. Conclusions: The r.sults suppor. the benefits of r.habilitation ser.ices in skilled n

关键词： Activities of Daily Living Skilled Nur.ing Facilities r.habilitation Independent Living

Tigr.s, Euphr.tes, and Shatt Al-Ar.b r.ver.System: Histor.c and Moder. Attempts to Manage and r.stor. Ir.q’s Lifeline

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Open Jour.al of Soil Science 2024年第1期14卷 28-63页

作者： Kenneth r.y Olson David r. Speidel College of Agr.cultur.l Consumer and Environmental Sciences University of Illinois Urbana USA US Ar.y Ir.q Mosul Iraq For.ign Agr.cultur.l Ser.ice Mahmudiyah Iraq For.ign Agr.cultur.l Ser.ice Washington D.C. USA

In Ir.q, the pr.ncipal r.ver. ar. the Tigr.s, Shatt Al-Ar.b and Euphr.tes. Fr.m their.headwater.sour.es in the mountains of easter. Tür.iye, these r.ver. descend thr.ugh valleys and gor.es and flow into the uplands of Syr.a and nor.her. and centr.l alluvial plain of Ir.q. The Euphr.tes and Tigr.s r.ver. confluence to for. the Shatt Al-Ar.b r.ver.at Al-Qur.ah which flows into the Per.ian Gulf. Fr.m sour.es in the Zagr.s Mountains other.tr.butar.es join the Tigr.s fr.m the east. The Tigr.s and Euphr.tes r.ver. flow in a southeaster. dir.ction thr.ugh the centr.l plain and dischar.e into the Mesopotamian Mar.hes, which include per.anent mar.hes, lakes, and r.par.an habitat. The r.ver. and their.tr.butar.es dr.in an ar.a of 879,790 km2 which includes almost the entir. ar.a of Ir.q as well as land in Syr.a, Tür.iye, Kuwait and Ir.n. The r.gion has histor.cal impor.ance as par. of the Fer.ile Cr.scent r.gion and wher. Mesopotamian civilization fir.t emer.ed. The post war.r.constr.ction effor.s in the Yusifiyah township, an impor.ant food pr.duction r.gion for.Baghdad, illustr.te the impor.ance of these water.r.sour.es. In addition, the advent of soil tunnels by Ir.qi insur.ents within the r.ver.ne cor.idor. will make r.constr.ction of this r.sour.e mor. complex. The pr.mar. objectives of this study ar. to assess lessons lear.ed, manage, and r.stor. the Tigr.s, Euphr.tes, and Shatt Al-Ar.b r.ver.system lifeline in Ir.q.

关键词： Mesopotamian Shatt Al-Ar.b Ir.q Tigr.s Euphr.tes Baghdad Soil Tunnels Yusifiyah

Estimating the Yield Loss of Winter.Wheat fr.m Dr.ught in the United States Souther. Plains r.gion as Influenced by El Niño-Souther. Oscillation (ENSO)

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Agr.cultur.l Sciences 2024年第9期15卷 1018-1034页

作者： Pr.m Woli Ger.ld r. Smith Char.es r. Long Fr.ncis M. r.uquette, Jr. Texas A&M Agr.Life r.sear.h Center Overton USA

Wheat (Tr.ticum aestivum L.) pr.duction is a major.economic activity in most r.gional and r.r.l ar.as in the Souther. Plains, a semi-ar.d r.gion of the United States. This r.gion is vulner.ble to dr.ught and is pr.jected to exper.ence a dr.er.climate in the futur.. Since the inter.nnual var.ability in climate in this r.gion is linked to an ocean-atmospher.c phenomenon, called El Niño-Souther. Oscillation (ENSO), dr.ughts in this r.gion may be associated with ENSO. Dr.ughts that occur.dur.ng the cr.tical gr.wth phases of wheat can be extr.mely costly. However. the losses due to an impending dr.ught can be minimized thr.ugh mitigation measur.s if it is pr.dicted in advance. Pr.dicting the yield loss fr.m an imminent dr.ught is cr.cial for.stakeholder.. One of the r.liable ways for.such pr.diction is using a plant physiology-based agr.cultur.l dr.ught index, such as Agr.cultur.l r.fer.nce Index for.Dr.ught (Ar.D). This study developed ENSO phase-specific, Ar.D-based models for.pr.dicting the dr.ught-induced yield loss for.winter.wheat in this r.gion by accounting for.its phenological phase-specific sensitivity to dr.ught. The r.asonable values of the dr.ught sensitivity coefficients of the yield model for.each ENSO phase (El Niño, La Niña, or.Neutr.l) indicated that the yield models r.flected r.asonably well the phenomena of water.str.ss decr.asing the winter.wheat yields in this r.gion dur.ng differ.nt ENSO phases. The values of var.ous goodness-of-fit measur.s used, including the Nash-Sutcliffe Index (0.54 to 0.67), the Willmott Index (0.82 to 0.89), and the per.entage er.or.(20 to 26), indicated that the yield models per.or.ed fair.y well at pr.dicting the ENSO phase-specific loss of wheat yields fr.m dr.ught. This yield model may be useful for.pr.dicting yield loss fr.m dr.ught and scheduling ir.igation allocation based on the phenological phase-specific sensitivity to dr.ught as impacted by ENSO.

关键词： Ar.D Dr.ught Dr.ught Index ENSO El Niño Gr.wth-Stage Model Phenological-Phase Pr.diction Semi-Ar.d Wheat Yield Loss