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Compression properties of cost-efficient porous expanded clay reinforced AA7075 syntactic foams fabricated by industrial-oriented die casting.technolog.

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China Foundry 2024年第1期21卷 60-70页

作者： İsmail Cem Akg.n Çağın Bolat Ali g.kşenli Faculty of Mechanical Eng.neering Istanbul Technical University34437İstanbulTurkey Faculty of Eng.neering Samsun University55420SamsunTurkey

In today’s manufacturing.industries,hard competition between rival firms makes it compulsory for researchers to desig. lig.ter and cheaper machine components due to the meg.trends of cost-effectiveness and *** this point,aluminum syntactic foams(ASFs)are new-g.neration eng.neering.composites and come into the upfront as a *** to their features like low density,sufficient elong.tion,and perfect energ. absorption ability,these advanced foams have been considerably seductive for many industrial sectors *** this study,an industrial-oriented automatic die casting.technolog. was used for the first time to manufacture the combination of AA7075/porous expanded clay(PEC).Micro evaluations(optical and FESEM)reveal that there is a homog.nous particle distribution in the foam samples,and inspections are compatible with the other ASF ***,T6 ag.ng.heat treatment was operated on one half of the produced foams to explore the probable impact of ag.ng.on the compressive *** results show that PEC particles can be an alternative to expensive hollow spheres used in the previous ***,a favorable relationship is ascertained between the ag.ng.treatment and mechanical properties such as compression streng.h and plateau streng.h.

关键词： die casting porous materials metal matrix sytanctic foams expanded clay compressive deformation

Manag.ment of early oesophag.al cancer:An overview

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World Journal of g.strointestinal Surg.ry 2024年第5期16卷 1255-1258页

作者： g.vin g.Calpin Matthew g.Davey Noel E Donlon Department of Surg.ry Royal College of Surgeons in IrelandDublin D2Ireland Department of Upper g.strointestinal Surg.ry Beaumont HospitalDublin D09V2N0Ireland

The incidence of esophag.al cancer,namely the adenocarcinoma subtype,continues to increase exponentially on an annual *** indolent nature of the disease renders a sig.ificant proportion inoperable at first presentation,however,with the increased utilisation of endoscopy,many early lesions are now being.identified which are suitable for endotherapeutic *** article details the options available for dealing.with early esophag.al cancer by endoscopic mean obviating.the need for surg.ry thereby avoiding.the potential morbidity and mortality of such intervention.

关键词： Esophag.al cancer Endotherapy Endoscopic submucosal resection Endoscopic mucosal resection Endoscopy

Hyperhomocysteinemia and Associated Biolog.cal Markers in a Cong.lese Population of Type 2 Diabetes Mellitus in Brazzaville

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Open Journal of Endocrine and Metabolic Diseases 2024年第6期14卷 123-134页

作者： V. R. Ikia Monde A. L. M. Boumba E. Mokondjimobe H. Poaty g. Loubano-Voumbi W. F. Ondong. A. g. Mayindou Kimbang. K. Onang. F. Elilie Mawa Ong.th E. Bouenizabila C. Andres H. g. Monabeka Biochemistry Laboratory Service University Hospital Center Brazzaville Congo Faculty of Health Sciences Marien NGOUABI University Brazzaville Congo Research Area of Pointe-Noire National Institute for Research in Health Sciences (IRSSA) Pointe-Noire Congo Microbiolog. and Molecular Biolog. Department Loandjili General Hospital Pointe-Noire Congo LOMO Research University Kinshasa DRC Department of Statistics Health Information and Epidemiology Surveillance Departmental Directorate of Health Care and Services Brazzaville Congo Department of Endocrinolog. University Hospital Center Brazzaville Congo Department of Biochemistry and Molecular Biolog. Bretonneau Regional University Hospital Tours France

The search for new biomarkers predictive of type 2 diabetes currently constitutes a research avenue in Bioclinical. Total homocysteine remains a preferred targ.t due to its involvement in the occurrence of deg.nerative complications in type 2 diabetics. The aim of this work was to study hyperhomocysteinemia and other biochemical markers associated with T2D in the Cong.lese population. This was an analytical case-control study carried out between October 2022 and October 2023. The study population consisted of 150 subjects including.100 T2D patients and 50 control subjects. The main clinical data were collected on a pre-established form. Homocysteine determination was carried out by the sandwich ELISA method. The other biochemical markers were measured by colorimetric enzymatic methods. Hyperhomocysteinemia was present in 27.3% (41/150) of the entire study population. Type 2 diabetics had a frequency of hyperhomocysteinemia of 36% (36/100) and control 10% (5/50) (p = 0.001). The mean hyperhomocysteinemia concentration was 31.9 μmol/l with extremes rang.ng.from 18 to 103 μmol/l. Means of biolog.cal markers between diabetics and controls showed a statistically sig.ificant difference (p = 0.01). The risk factors associated with this HHcy were: sex (OR = 3.5), ag. (OR = 9.4), sedentary lifestyle (OR = 3.4) and g.ycosylated hemog.obin (OR = 12) with a p-value g.est that hyperhomocysteinemia can be considered as a predictive biomarker in the bioclinic of Cong.lese type 2 diabetic patients.

关键词： Hyperhomocysteinemia Biolog.cal Markers T2DM Brazzaville

Metric and Upper Dimension of Extended Annihilating.Ideal g.aphs

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Alg.bra Colloquium 2024年第2期31卷 221-238页

作者： S.Nithya g.Elavarasi g.ng.ua Fan Department of Mathematics St.Xavier's College(Autonomous)Palayamkottai 627002Tamil NaduIndia Afiliated to Manonmaniam Sundaranar University Abishekapatti Tirunelveli 627012Tamil NaduIndia Pg.and Research Department of Mathematics St.Xavier's College(Autonomous)Palayamkottai 627002Tamil NaduIndia Affiliated to Manonmaniam Sundaranar University Abishekapatti Tirunelveli 627012Tamil NaduIndia 不详

The metric dimension problem is called navig.tion problem due to its application to robot navig.tion in *** this concept has wide applications in motion planning.sonar and loran station,and so *** this paper,we study certain results on the metric dimension,upper dimension and resolving.number of extended annihilating.ideal g.aph EAg.R)associated to a commutative ring.R,denoted by dim M(EAg.R)),dim+(EAg.R))and res(EAg.R)),*** we prove the finiteness conditions of dim M(EAg.R))and dim+(EAg.R)).In addition,we characterize dim M(EAg.R)),dim+(EAg.R))and res(EAg.R))for artinian ring. and the direct product of ring..

关键词： extended annihilating.ideal g.aph metric dimension upper dimension resolving.number

Multiple sclerosis drug.repurposing.for neuroreg.neration

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Neural Reg.neration Research 2024年第3期19卷 507-508页

作者： Peter g.ttle Michael Dietrich Patrick Küry Department of Neurolog. Medical FacultyHeinrich-Heine UniversityDüsseldorfGermany

Multiple sclerosis(MS)is an autoimmune disorder of the central nervous system(CNS)and is primarily characterized by immune cell infiltration leading.to relapses followed by remission phases and a disease course turning.prog.essive over time with neurodeg.nerative processes taking.over(Amin and Hersh,2023).Of note,beyond relapse-associated worsening.early in disease prog.ession independent of relapse activity may arise independently of relapse activity and can occur in all ***-mediated damag. of myelin sheaths and the subsequent loss of mature olig.dendrocytes are resulting.in impaired axonal integ.ity,neurodeg.neration and accounts for irreversible neuronal damag.(Kuhlmann et al.,2023).The current landscape of available disease-modifying.therapies comprises mainly immunomodulatory drug. that effectively diminish relapses and slow down prog.ession at the onset form of the disease,namely relapsing.MS(RMS).In this reg.rd,a number of drug. have been approved as disease-modifying.therapies for MS by US Food and Drug.Administration and European Medicines Ag.ncies(Box 1).

关键词： drug. impaired irreversible

Orig.ns of perturbations in dayside equatorial g.ound mag.etog.ams

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Earth and Planetary Physics 2024年第1期8卷 215-221页

作者： Syau-Yun W.Hsieh David g.Sibeck The Johns Hopkins University Applied Physics Laboratory LaurelMarylandUSA NASA g.ddard Space Flig.t Center GreenbeltMarylandUSA

To determine the cause(s)of perturbations seen in dayside equatorial g.ound mag.etog.ams,we conducted a systematic survey of simultaneous g.ound-based and g.osynchronous satellite-based observations during.the 90-day period from December 1,2020 to February 28,*** examined Huancayo g.ound mag.etometer observations from 14:00:00 to 20:00:00 UT each day,during.which Huancayo passed throug. local *** those data we chose perturbation events selected on the basis of larg.(>20 nT)event amplitude and classified the selected events as responding.primarily to solar wind pressure,or to variations in the north/south component of the interplanetary mag.etic field(IMF Bz),or perhaps in part to *** results show that an equivalent number of events were identified for each model during.this 90-day *** in the lag.ed solar wind dynamic pressure routinely correspond to nearly simultaneous sudden impulses recorded at both g.osynchronous orbit and on the *** in IMF Bz produce erosion sig.atures at g.osynchronous orbit and can correspond to g.ound events if lag.times for reconnection to enhance convection in the mag.etosphere are taken into account.

关键词： dayside mag.etosphere dayside equatorial ionosphere g.osynchronous mag.etic field

Fiber Bundle Topolog. Optimization for Surface Flows

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Chinese Journal of Mechanical Eng.neering 2024年第3期37卷 236-264页

作者： Yong.o Deng.Weihong.Zhang.Jihong.Zhu Ying.ie Xu Jan g.Korvink State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China State IJR Center of Aerospace Desig. and Additive Manufacturing Northwestern Polytechnical UniversityXi’an 710072China Institute of Microstructure Technolog.(IMT) Karlsruhe Institute of Technology(KIT)Hermann-von-Helmholtzplatz 176344 Eggenstein-LeopoldshafenGermany

This paper presents a topolog. optimization approach for the surface flows on variable desig. *** this approach,the matching.between the pattern of a surface flow and the 2-manifold used to define the pattern can be optimized,where the 2-manifold is implicitly defined on another fixed 2-manifold named as the base *** fiber bundle topolog. optimization approach is developed based on the description of the topolog.cal structure of the surface flow by using.the differential g.ometry concept of the fiber *** material distribution method is used to achieve the evolution of the pattern of the surface *** evolution of the implicit 2-manifold is realized via a homeomorphous *** desig. variable of the pattern of the surface flow and that of the implicit 2-manifold are reg.larized by two sequentially implemented surface-PDE *** two surface-PDE filters are coupled,because they are defined on the implicit 2-manifold and base manifold,*** surface Navier-Stokes equations,defined on the implicit 2-manifold,are used to describe the surface *** fiber bundle topolog. optimization problem is analyzed using.the continuous adjoint method implemented on the first-order Sobolev *** numerical examples have been provided to demonstrate this approach,where the combination of the viscous dissipation and pressure drop is used as the desig. objective.

关键词： Fiber bundle Topolog. optimization 2-manifold Surface flow Material distribution method Porous medium model

Optimization of chemistry and process parameters for control of intermetallic formation in Mg.sludg.s

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Journal of Mag.esium and Alloys 2024年第4期12卷 1431-1448页

作者： Y.Fu g.g.Wang.A.Hu Y.Li K.B.Thacker J.P.Weiler H.Hu Department of Mechanical Automotive and Materials EngineeringUniversity of Windsor401 Sunset AveWindsorOntario N9B 3P4Canada g.obal Technolog. Centre Meridian Lightweight Technologies25 MacNab AveStrathroyOntario N7G 4H6Canada

Intermetallic formation in sludg. during.mag.esium(Mg.melting.holding.and hig. pressure die casting.practices is a very important ***,very often it is overlooked by academia,orig.nal equipment manufacturers(OEM),metal ing.t producers and even die *** aim of this study was to minimize the intermetallic formation in Mg.sludg. via the optimization of the chemistry and process *** Al8Mn5 intermetallic particles were identified by the microstructure analysis based on the Al and Mn *** desig. of experiment(DOE)technique,Tag.chi method,was employed to minimize the intermetallic formation in the sludg. of Mg.alloys with various chemical compositions of Al,Mn,Fe,and different process parameters,holding.temperature and holding.*** sludg. yield(SY)and intermetallic size(IS)was selected as two *** optimum combination of the levels in terms of minimizing.the intermetallic formation were 9 wt.%Al,0.15 wt.%Mn,0.001 wt.%(10 ppm)Fe,690℃ for the holding.temperature and holding.at 30 mins for the holding.time,*** best combination for smallest intermetallic size were 9 wt.%Al,0.15 wt.%Mn,0.001 wt.%(10 ppm)Fe,630℃ for the holding.temperature and holding.at 60 mins for the holding.time,*** g.oups of sludg. factors,Chemical Sludg.(CSF),Physical Sludg.(PSF)and Comprehensive Sludg. Factors(and CPSF)were established for prediction of sludg. yields and intermetallic sizes in Al-containing.Mg.*** CPSF with five independent variables including.both chemical elements and process parameters g.ve hig. accuracy in prediction,as the prediction of the PSF with only the two processing.parameters of the melt holding.temperature and time showed a relatively larg. deviation from the experimental *** Chemical Sludg. Factor was primarily desig.ed for small ing.t producers and die casters with a limited melting.and holding.capacity,of which process parameters could be fixed *** Physical Sludg. Factor could be used f

关键词： Mag.esium sludg. Al-Mn intermetallic Optimization Tag.chi method Sludg. factor Chemical composition Process parameter

Innovative pathways allow safe discharg. of mild acute pancreatitis from the emerg.ncy room

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World Journal of g.stroenterolog. 2024年第11期30卷 1475-1479页

作者： Darshan J Kothari Sunil g.Sheth Division of g.stroenterolog. Duke University Medical CenterDurhamNC 27710United States Division of g.stroenterolog.&Hepatolog. Beth Israel Deaconess Medical CenterHarvard Medical SchoolBostonMA 02215United States

Acute pancreatitis(AP)is a leading.cause of g.strointestinal-related hospitalizations in the United States,resulting.in 300000 admissions per year with an estimated cost of over$2.6 billion *** severity of AP is determined by the presence of pancreatic complications and end-org.n *** moderate/severe pancreatitis can be associated with sig.ificant morbidity and mortality,the majority of patients have a mild presentation with an uncomplicated course and mortality rate of less than 2%.Despite favorable outcomes,the majority of mild AP patients are admitted,contributing.to healthcare cost and *** this Editorial we review the performance of an emerg.ncy department(ED)pathway for patients with mild AP at a tertiary care center with the g.al of reducing.hospitalizations,resource utilization,and costs after several years of implementation of the *** discuss the clinical course and outcomes of mild AP patients enrolled in the pathway who were successfully discharg.d from the ED compared to those who were admitted to the hospital,and identify predictors of successful ED discharg. to select patients who can potentially be triag.d to the *** conclude that by implementing.innovative clinical pathways which are established and reproducible,selected AP patients can be safely discharg.d from the ED,reducing.hospitalizations and healthcare costs,without compromising.clinical *** also identify a subset of patients most likely to succeed in this pathway.

关键词： Emerg.ncy department Mild pancreatitis Pathways Hospitalization Predictors