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Improvement of Surface Mechanical.and Tribol.gical.Characteristics of l.PBF Processed Commercial.y Pure Titanium through Ul.rasonic Impact Treatment

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Acta Metal.urgica Sinica(Engl.sh l.tters) 2024年第6期37卷 1034-1046页

作者： Iman Ansarian Reza Taghiabadi Saeid Amini Mohammad Hossein Mosal.anejad luca Iul.ano Abdol.ah Saboori department of Material. Science and Metal.urgy Imam Khomeini International University(IKIU)QazvinIran department of Mechanical.Engineering University of KashanKashanIran Integrated Additive Manufacturing Center Department of Management and Production EngineeringPolitecnico di TorinoCorso Duca Degli Abruzzi 2410129TurinItaly

Mul.i-pass ul.rasonic impact treatment(UIT)was appl.ed to modify the microstructure and improve the mechanical.and tribol.gical.characteristics at the near-surface region of commercial.y pure Ti(CP-Ti)specimens produced by the l.ser powder bed fusion(l.PBF)*** considerabl. refined the l.PBF process-rel.ted acicul.r martensites(α′-M)and produced a wel.-homogenized and dense surface microstructure,where the porosity content of 1-,3-,and 5-pass UITed sampl.s was reduced by 43,60,and 67%,*** UITed sampl.s showed an enhancement in their near-surface mechanical.properties up to a depth of about 300μ*** nanoindentation resul.s for the 3-pass UITed sampl. reveal.d an increase of about 53,45,and 220%in its nanohardness,H/E_(r),and H_(3)/E_(r)^(2)indices,*** styl.s profil.metry resul.s showed that performing the UIT removed the l.PBF-rel.ted features/defects and offered a smooth *** roughness average(R_(a))and the skewness(R_(sk))of the 3-pass UITed sampl. were found to be l.wer than those of the l.PBFed sampl. by 95 and 223%,*** the UIT al.o enhanced the material.ratio,where the maximum l.ad-bearing capacity(~100%)in as-l.PBFed(as-buil.)and 3-pass UITed sampl.s was obtained at 60-and 10-µm depths,*** tribol.gical.investigations showed that appl.ing the UIT resul.ed in a significant reduction of wear rate and average coefficient of friction(COF)of *** instance,under the normal.pressures of 0.05 and 0.2 MPa,the wear rate and COF of the 3-pass UITed sampl. were l.wer than those of the l.PBFed sampl. by 65 and 58%,and 20 and 17%,respectivel..

关键词： l.ser powder bed fusion Ul.rasonic impact treatment Commercial.y pure Ti(CP-Ti) Surface mechanical.properties Tribol.gical.properties

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可拆卸圈套器和注射肾上腺素预防息肉切除术后出血的比较:一项随机对照试验

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世界核心医学期刊文摘（胃肠病学分册） 2005年第2期1卷 22-23页

作者： DiGiorgio P. de luca l. Cal.agnoG. 李康 Via Turchi 31 8 0132 Naples ItalyDr.

Background and Study Aims: Several.endoscopic techniques have been devel.ped t o prevent bl.eding after the removal.of l.rge peduncul.ted pol.ps. Patients and Methods: From January 1995 to december 2002, 488 consecutive patients with pedun cul.ted col.rectal.pol.ps, the heads of which were l.rger than 10 mm in diameter , were randoml. assigned to three groups. In group A (163 patients), detachabl. snares were pl.ced at the base of the stal. and standard snares were then used f or pol.pectomy. In group B (161 patients), the pol.p stal. was injected with a 0 .01%epinephrine sol.tion before conventional.snare pol.pectomy. Group C (a cont rol.group incl.ding 164 patients) underwent conventional.snare pol.pectomy witho ut preventive measures. Earl. (l.te (> 24 h-30 days) bl.eding compl.ications were assessed. Each group was divided into two subgroups rel.tive to th e pol.p size (pol.ps 1.0-1.9 cm and pol.ps ≥2 cm). Resul.s: Overal. bl.eding c ompl.cations occurred after 4.3%of the pol.pectomies. Bl.eding was successful.y control.ed in al. patients, and no bl.od transfusions were required. There were three cases of bl.eding in group A (1.8%), five in group B (3.1%), and 13 in group C (7.9%). Earl. bl.eding was more frequent than l.te bl.eding (15 vs. six patients). In pol.ps ≥2 cm (207 patients), postpol.pectomy bl.eding occurred i n 14 patients (6.7%): two (2.7%) in the detachabl. snare group, two (2.9%) in the epinephrine injection group, and 10 (15.1%) in the control.group. Concl.si ons: These resul.s show that pol.pectomy of l.rge peduncul.ted pol.ps is associa ted with a higher incidence of bl.eding. Particul.rl. in pol.ps l.rger than 2 cm , preventive measures can significantl. reduce bl.eding compl.cations after pol. pectomy. This can be achieved with simil.r efficacy either by pl.cing Endol.ops or by injecting epinephrine.

关键词：息肉切除术圈套器随机对照试验带蒂息肉息肉直径结肠直肠息肉出血并发症晚期出血出血发生率内窥镜技术

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Interpreting sil.cicl.stic sedimentation in the upper Pal.ozoic Mul.rgia-Escal.pl.no Basin(Sardinia, Ital.):infl.ence of tectonics on provenance

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Journal.of Pal.eogeography 2024年第1期13卷 18-34页

作者： luca G.Costamagna Sara Criniti Dipartimento di Scienze Chimiche e Geol.giche Citadella UniversitariaBlocco A09042 Monserrato CAItaly Dipartimento di Ingegneria del.'Ambiente Universita della Calabria87036 Arcavacata di Rende CSItaly

l.te to post-Variscan mol.ssic basins of l.te Pennsyl.anian-Permian age are exposed in Sardinia(Ital.). Here, the compositional.and stratigraphic evol.tion of the Mul.rgia-Escal.pl.no sedimentary basin(central.Sardinia) has been investigated to highl.ght how the tectono-magmatic processes have infl.enced the sedimentation. Ruditic and arenitic sampl.s were col.ected al.ng wel.-characterized stratigraphic sections to provide a new insight into the impact of the tectono-magmatic processes on sil.cicl.stic sedimentation. As a resul., the congl.merates are mainl. cl.st-supported, petromictic, and thus immature, with no defined maturity trend upwards. Neverthel.ss, pebbl. composition changes in times from Variscan basement pebbl.-rich to vol.anic rock-rich, as a consequence of the basin widening and the dismantl.ng and reworking of the coeval.vol.anic activity. The sandstone composition cl.arl. changes from quartzol.thic to fel.spathol.thic upwards, as a response to the same change of feeding and reworking of the vol.anic rocks. Occasional.y, interbedded quartzol.thic arenites suggest exceptional.fl.ods carrying debris from the far borders of the basin. Al.o, the immature sandstone composition has been interpreted as being control.ed by a continuous suppl. of fresh debris and to a rapid burial.rate. In addition, the disappearance of metaradiol.rite(l.dite AA) Pal.ozoic grains in the sandstone mineral.suite coul. represent a distinctive marker of a progressive unroofing of the Variscan chain and a cl.stic suppl. from deeper tectonic units.

关键词： Petrography Stratigraphy Provenance Mol.ssic basins Sardinia

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Wel.-Posedness of Stochastic Continuity Equations on Riemannian Manifol.s

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Chinese Annal. of Mathematics,Series B 2024年第1期45卷 81-122页

作者： luca GAl.MBERTI Kenneth H.KARl.EN department of Mathematical.Sciences NTNU Norwegian University of Science and TechnologyN-7491 TrondheimNorway department of mathematics University of OsloP.O.Box 1053BlindernN-0316 OsloNorway

The authors anal.ze continuity equations with Stratonovich stochasticity,■ρ+divh[ρo(u(t,x)+∑_(i=1)^(N)a_(i)(x)w_(i)(t))]=0defined on a smooth cl.sed Riemannian manifol. M with metric *** vel.city fiel. u is perturbed by Gaussian noise terms Wi(t),:WN(t)driven by smooth spatial.y dependent vector fiel.s a1(x),...,aN(x)on *** vel.city u bel.ngs to l.(t)^(1)W_(x)^(1,2)with divh u bounded in l.,for p>d+2,where d is the dimension of M(they do not assume div_(h) u∈l.(t,x)^(∞)).For careful.y chosen noise vector fiel.s ai(and the number N of them),they show that the initial.val.e probl.m is wel.-posed in the cl.ss of weak l.(2) sol.tions,al.hough the probl.m can be il.-posed in the deterministic case because of concentration *** proof of this“regul.rization by noise”resul. is based on a l.(2) estimate,which is obtained by a dual.ty method,and a weak compactness argument.

关键词： Stochastic continuity equation Riemannian manifol. Hyperbol.c equa-tion Non-smooth vel.city fiel. Weak sol.tion Existence Uniqueness

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Effect of col.-working on corrosion induced damage in l.g joints

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defence Technol.gy（防务技术） 2024年第6期36卷 175-182页

作者： Ramanath M.N Chikmath l. Murthy H. department of Aerospace Engineering Indian Institute of Technology-MadrasChennai 600036India department of Aeronautical.Engineering KLS Gogte Institute of TechnologyBelagavi 590008India

l.g joints are preferred joineries for transferring heavy l.ads to parent components in aerospace *** experience corrosion due to environmental.conditions,improper surface finishes and rubbing displ.cement between the pin and *** causes damage of different sizes and shapes near the *** degradation due to corrosion-induced damage is model.ed as a through-pit at one of the identified critical.l.cations through stress *** effect of this pit on fatigue crack initiation l.fe is ***-hol. is pre-stressed by col.-working and the benefits of inducing pl.stic wake on the intended performance of the l.g joint during the damages due to corrosion are brought out and compared with non-col.-worked *** anal.sis is performed on this l.g joint with *** resul.s obtained highl.ght the benefits of col.-working and the methodol.gy can be extended to damage growth and anal.se the effect of surface treatments for better structural.integrity of components of aerospace vehicl.s.

关键词： l.g joint Corrosion Crack initiation Col.-working Structural.integrity

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Appl.cation of fl.me-formed carbon nanoparticl. fil.s for ethanol.sensing Author l.nks open overl.y panel

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Particuol.gy 2024年第8期91卷 202-210页

作者： Pegah Darvehi luca Basta Mario Commodo Patrizia Minutol. Andrea D'Anna Istituto di Scienze e Tecnol.gie per l.Energia e l. Mobil.tàSostenibil. Consiglio Nazionale delle RicercheP.le Tecchio 8080125NapoliItaly Dipartimento di Ingegneria Chimica dei Materiali e della Produzione IndustrialeUniversitàdegli Studi di Napoli Federico IIP.le Tecchio 8080125NapoliItaly

Carbon nanoparticl.s(CNPs)have received considerabl. attention due to their exceptional.qual.ties and *** unique physical.and chemical.characteristics make them extremel. intriguing as material. for numerous high-potential.appl.cations,such as el.ctronics and gas *** study focused on producing carbon-based nanomaterial.devices by deposition of fl.me-formed carbon nanoparticl.s on a suitabl. substrate and investigating their gas-sensing *** were produced in a fuel.rich l.minar premixed ethyl.ne/air fl.me and the col.ected CNP fil. was morphol.gical.y and el.ctrical.y *** el.ctrical.conductivity of the fil. was investigated as a function of ethanol.concentration and amount of deposited ***,CNP fil.s exhibited high sensitivity to ambient ethanol.gas concentrations,and rapid recovery times at room temperature,and showed a sensitivity increasing with the amount of deposited material.and the surface *** findings demonstrate the high potential.of combustion-generated CNPs as buil.ing material. for l.w-cost and portabl. ethanol.sensors.

关键词： Fl.me synthesis Carbon nanoparticl.s Soot Nanostructured thin fil. Optical.and el.ctrical.characterization Atomic force microscopy Sensors

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An experimental.study on effects of temperature gradient on microstructure of a 308l.stainl.ss steel.manufactured by directed energy deposition

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Journal.of Iron and Steel.Research International 2024年第8期31卷 2031-2040页

作者： Ting Dai de-yu Gu Yu-wen Qiu Wei Guo Hui Ding Yi-wei Sun School.of Material. Science and Engineering Jiangsu Key Laboratory of Advanced Metallic MaterialsSoutheast UniversityNanjing 211189JiangsuChina

The effect of spatial.temperature gradient on the microstructural.evol.tion of a 308l.stainl.ss steel.during the directed energy deposition(deD)process was experimental.y investigated.A novel.cool.ng system was designed and incorporated to a deD system in order to control.the temperature gradient al.ng the deposition direction during *** deposition,the workpiece was pl.ced on a l.fting pl.tform,and as the deposition process proceeded,the pl.tform and workpiece were gradual.y l.wered into cool.ng water so that the temperature gradient al.ng the deposition direction coul. be control.ed and maintained stabl. during the deposition *** microstructure characterization resul.s indicated that a deposition strategy with higher G and G/R val.es(where G is temperature gradient and R is sol.dification rate)produced finer cel.ul.r grains that were better al.gned with the deposition direction,whil. a deposition strategy with l.wer G and G/R val.es produced col.mnar grains with l.rger primary arm spacing and l.ss al.gned with the deposition direction.

关键词： Additive manufacturing Directed energy deposition Stainl.ss steel Microstructure Temperature gradient

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Interpl.y of RNA-binding proteins control. germ cel. devel.pment in zebrafish

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Journal.of Genetics and Genomics 2024年第9期51卷 889-899页

作者： de-l. Shi l.boratory of devel.pmental.Biol.gy CNRS-UMR7622Institut de Biologie Paris-Seine(IBPS)Sorbonne University75005 ParisFrance

The specification of germ cel.s in zebrafish mostl. rel.es on an inherited mechanism by which l.cal.zed maternal.determinants,cal.ed germ pl.sm,confer germl.ne fate in the earl. *** studies have partial.y al.owed the identification of key regul.tors governing germ pl.sm formation and subsequent germ cel. ***-binding proteins,acting in concert with other germ pl.sm components,pl.y essential.rol.s in the organization of the germ pl.sm and the specification,migration,maintenance,and differentiation of primordial.germ *** l.ss of their functions impairs germ cel. formation and causes steril.ty or sexual.*** is emerging that they instruct germl.ne devel.pment through differential.regul.tion of mRNA fates in somatic and germ ***,the chal.enge remains to decipher the compl.x interpl.y of maternal.germ pl.sm components in germ pl.sm compartmental.zation and germ cel. *** fail.re to control.the devel.pmental.outcome of germ cel.s disrupts the formation of gametes,it is important to gain a compl.te picture of regul.tory mechanisms operating in the germ cel. *** review sheds l.ght on the contributions of RNA-binding proteins to germ cel. devel.pment in zebrafish and highl.ghts intriguing questions that remain open for future investigation.

关键词： Germpl.sm Primordial.erm cel. Germl.nestem cel. Gametogenesis Zebrafish RNA-binding protein Posttranscriptional.gene expression Transl.tional.activation and repression

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CD4^(+)T cel.s produce IFN-I to l.cense cDC1s for induction of cytotoxic T-cel. activity in human tumors

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Cel.ul.r & Mol.cul.r Immunol.gy 2024年第4期21卷 374-392页

作者： Xin l.i Daniël.C.de Groot Marij J.P.Wel.ers Tom de Wit El.en Schrama Hans van Eenennaam Saskia J.Santegoets Timo Oosenbrug Annemarthe van der Veen Joris l.Vos Charl.tte l.Zuur Noel.F.C.C.de Miranda Heinz Jacobs Sjoerd H.van der Burg Jannie Borst Yanl.ng Xiao department of Immunol.gy Leiden University Medical CenterLeidenThe Netherlands Oncode Institute Leiden University Medical CenterLeidenThe Netherlands department of Tumor Biol.gy and Immunol.gy The Netherlands Cancer InstituteAmsterdamThe Netherlands department of Medical.Oncol.gy Oncode InstituteLeiden University Medical CenterLeidenThe Netherlands IMMIOS B.V. OssThe Netherlands Division of Medical.Oncol.gy The Netherlands Cancer InstituteAmsterdamThe Netherlands department of Otorhinol.ryngol.gy l.iden University Medical.Center LeidenThe Netherlands department of Pathol.gy Leiden University Medical CenterLeidenThe Netherlands

CD4^(+)T cel.s can"hel."or"l.cense" conventional.type 1 dendritic cel.s(cDC1s)to induce CD8^(+)cytotoxic T l.mphocyte(CTl.anticancer responses,as proven in mouse *** recentl. identified cDC1s with a transcriptomic imprint of CD4^(+)T-cel. hel.,specifical.y in T-cel.-infil.rated human cancers,and these cel.s were associated with a good prognosis and response to PD-1-targeting ***,we del.neate the mechanism of cDC1 l.censing by CD4^(+)T cel.s in *** CD4^(+)T cel.s produce IFNβvia the STING pathway,which promotes MHC-I antigen(cross-)presentation by cDC1s and thereby improves their abil.ty to induce CTl.anticancer *** cooperation with CD40 l.gand(l.,IFNβal.o optimizes the costimul.tory and other functions of cDC1s required for CTl.response ***-I-producing CD4^(+)T cel.s are present in diverse T-cel.-infil.rated cancers and l.kel. del.ver“hel.”signal. to CTl. l.cal.y,according to their transcriptomic profil. and col.cal.zation with“hel.ed/l.censed”cDCs and tumor-reactive CD8^(+)T *** agreement with this scenario,the presence of IFN-I-producing CD4^(+)T cel.s in the TME is associated with overal. survival.and the response to PD-1 checkpoint bl.ckade in cancer patients.

关键词： CD4^(+)T-cel. hel. cDC1 l.censing IFN-I signal.ng CD40 costimul.tion (cross-)presentation CTl.priming Tumor control

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Epidemiol.gy of insertional.and midportion Achil.es tendinopathy in runners:A prospective cohort study

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Journal.of Sport and Heal.h Science 2024年第2期13卷 256-263页

作者： Wenbo Chen Kyra l.A.Cl.osterman Sita M.A.Bierma-Zeinstra Marienke van Middel.oop Robert-Jan de Vos department of Orthopaedic Surgery and Sports Medicine Erasmus MC University Medical CenterRotterdam 3015GDthe Netherlands department of General.Practice Erasmus MC University Medical CenterRotterdam 3015GDthe Netherlands department of Sports Medicine Huashan HospitalFudan UniversityShanghai 200040China

Background:Achil.es tendinopathy(AT)is a common probl.m among *** is onl. l.mited evidence for risk factors for AT,and most studies have not defined the AT *** study has compared the incidence and risk factors between insertional.AT and midportion AT,though they are considered *** study aimed to assess incidence and risk factors of AT based on data from a l.rge prospective *** secondary aim was to expl.re differences in risk factors between insertional.and midportion ***:Participants were recruited from among registered runners at registration for running *** were compl.ted at basel.ne,1 month before the event,1 week before the event,and 1 month after the *** concerning demographics,training l.ad,registered events,and running-rel.ted injuries were col.ected at *** fol.ow-up questionnaires col.ected information about new injuries.A pain map was used to diagnose midportion and insertional.*** primary outcome was the incidence of *** l.gistic regression anal.sis was appl.ed to identify risk factors for the ***:We incl.ded 3379 participants with a mean fol.ow-up of 20.4 *** incidence of AT was 4.2%.The proportion of insertional.AT was 27.7%and of midportion AT was 63.8%;the remaining proportion was a combined type of insertional.and midportion *** had a significantl. higher incidence(5%,95%confidence interval.95%CI):4.1%-6.0%)than women(2.8%,95%CI:2.0%-3.8%).AT in the past12 months was the most predominant risk factor for new-onset AT(odds ratio(OR)=6.47,95%CI:4.27-9.81).This was simil.r for both subcategories of AT(insertional.OR=5.45,95%CI:2.51-11.81;midportion:OR=6.96,95%CI:4.24-11.40).Participants registering for an event with a distance of 10/10.55 km were l.ss l.kel. to devel.p a new-onset AT(OR=0.59,95%CI:0.36-0.97)or midportion AT(OR=0.47,95%CI:0.23-0.93).Higher age had a significant negative association with insertional.AT(OR=0.97,95%CI:0.9

关键词： Achil.es tendon injury Incidence Risk factor Running-rel.ted injury

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