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Increased CO2 levels during the f.rst Half.of.Incubation at High Altitude Modif.es Embryonic Development of.f.rtile leghorn Breeder Eggs

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f.od and Nutrition Sciences 2024年第7期15卷 524-547页

作者： Marco A. Juárez-Estrada Erik I. lópez-Ruiz Sonia lópez-Cordova Guillermo Tellez-Isaias Omar f. Prado-Rebolledo Departamento de Medicina y Zootecnia de Aves Facultad de Medicina Veterinaria y Zootecnia Universidad Nacional Autnoma de Mxico Ciudad de Mxico Mxico Department of.Poultry Science Division of Agriculture University of Arkansas Fayetteville USA f.cultad de Medicina Veterinaria y Zootecnia Universidad de Colima Tecomn Mxico

The exchange of.oxygen (O2) and carbon dioxide (CO2) within an incubator has a signif.cant impact on embryonic development (ED) and hatching processes. This study examines the inf.uence of.non-ventilation (NV) conditions during the f.rst ten days of.incubation at high altitudes on leghorn hens hatching eggs. f.ve hundred f.ur hatching eggs were equally divided into three treatment groups and placed in twelve incubators (R = 4). The f.rst group was subjected to standard ventilated conditions (V) during the setting phase. The ventilation inlet holes of.the remaining incubators in the NV treatments were closed with either micropore (M) or polypropylene (P) tape, ref.rred to as NVM and NVP groups, respectively. These two dif.erent airtight settings were intended to allow f.r a gradual rise in CO2 naturally generated by the embryos. Results indicate that carbon dioxide concentration gradually increased during the f.rst half.of.incubation, reaching 1.42% in the NVM group and 1.20% in the NVP group, while the V condition group remained at 0.15%. f.om 10 days of.incubation onwards, normal V conditions were restored in all incubators. The highest hatchability of.f.rtile eggs (Hf.) was shown by the NVP group (55.7%), f.llowed by the V (52.6%) and NVM (38.6%) groups. The NVP group showed a greater yolk-f.ee body mass (Yf.M) f.om 10 days of.incubation until the hatch basket transf.r. NV conditions during the f.rst 10 days of.incubation at high altitude produced higher Yf.M with gradually decreasing yolk sac mass. In comparison to the NVM and V conditions, the particular NVP condition showed a benef.cial impact on the quality of.hatched chicks. Sustaining NVP condition (1.2% of.CO2) throughout the f.rst half.of.incubation at high altitude generated the optimal environment in the incubator ensuring the best hatchability results. This study highlights how important it is f.r hatchery managers to recognize the inf.uence of.low O2 and high levels of.CO2 on the development trajectori

关键词： Non-Ventilation Hypercapnia Hypoxia Egg Mass loss Hatchability Embryonic Mortality Hatchling Chick Quality

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Nickel sulf.te solution f.uoride separation with hydrous zirconium oxide

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Tungsten 2024年第2期6卷 367-381页

作者： Elbert M.Nigri Ummul K.Sultana André l.A.Santos James W.Vaughan Sonia D.f.Rocha Department of.Mining Engineering Federal University of Minas GeraisBelo Horizonte 31270-901Brazil School of.Chemical Engineering University of QueenslandSt Lucia 4072Australia

f.uoride is an impurity in nickel sulf.te production,which is required f.r electric vehicle *** zirconium oxide(HZO)was evaluated f.r removing f. uoride f.om nickel sulf.te *** f.uoride removal occurred at pH value 4 and optimal pH value is 4–5,considering Zr *** availability decreases with pH due to hydrogen f.uoride and zirconium f.uoride aqueous *** removal is initially rapid,with 50 wt.%removal in 7 min,f.llowed by slow removal up to 68 wt.%af.er 72 h and f.llows second order rate *** removal was dominated by an ion exchange mechanism and resulting Zr–f.bonds were observed using f.urier-transf.rm inf.ared *** presence of.nickel sulf.te decreased loading capacity compared to a salt-f.ee *** maintained adsorption capacity through f.ve cycles of.loading and regeneration.

关键词： Hydrous zirconium oxide Nickel sulf.te f.uoride Adsorption Anion exchange

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Modelling dynamic pantograph loads with combined numerical analysis

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Railway Engineering Science 2024年第1期32卷 81-94页

作者： f.f.Jackson R.Mishra J.M.Rebelo J.Santos P.Antunes J.Pombo H.Magalhaes l.Wills M.Askill School of.Computing and Engineering University of HuddersfieldHuddersfieldUK School of.Computing and Engineering Institute of Railway ResearchUniversity of HuddersfieldHuddersfieldUK IDMEC Instituto Superior TecnicoUniversidade de LisboaLisbonPortugal ISEl Instituto Politecnico de LisboaLisbonPortugal Hitachi Rail Newton AycliffeUK Wabtec/Brecknell Willis ChardUK

Appropriate interaction between pantograph and catenary is imperative f.r smooth operation of.electric *** heights of.overhead lines to accommodate level crossings,overbridges,and tunnels pose signif.cant challenges in maintaining consistent current collection perf.rmance as the pantograph aerodynamic prof.le,and thus aerodynamic load changes signif.cantly with operational *** research aims to analyse the global f.ow characteristics and aerodynamic f.rces acting on individual components of.an HSX pantograph operating in dif.erent conf.gurations and orientations,such that the results can be combined with multibody simulations to obtain accurate dynamic insight into contact ***,computational f.uid dynamics simulations are used to investigate the pantograph component loads in a representative setting,such as that of.the recessed cavity on a Class 800 *** an aerodynamic perspective,this study indicates that the total drag f.rce acting on non-f.xed components of.the pantograph is larger f.r the knuckle-leading orientation rather than the knuckle-trailing,although the dif.erence between the two is f.und to reduce with increasing pantograph *** the aerodynamic loads acting on individual components with multibody tools allows f.r realistic dynamic insight into the pantograph *** results obtained show how considering aerodynamic f.rces enhance the realism of.the models,leading to behaviour of.the pantograph-catenary contact f.rces closely matching that seen in experimental tests.

关键词： Pantograph-catenary interaction Pantograph aerodynamics Computational f.uid dynamics Pantograph loads Current collection perf.rmance

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Development of.an ultrathin liquid sheet target f.r laser ion acceleration at high repetition rates in the kilohertz range

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High Power laser Science and Engineering 2024年第3期12卷 134-145页

作者： M.f.le A.P.Kovács T.Gilinger M.Karnok P.Gaál S.f.gul G.Marowsky K.Osvay National laser-Initiated Transmutation laboratory University of SzegedSzegedHungary Department of.Experimental Physics University of SzegedSzegedHungary ElI AlPS ELI-HU Non-Profit Ltd.SzegedHungary Department of.Optics and Quantum Electronics University of SzegedSzegedHungary Advanced Microf.uidic Systems GmbH GöttingenGermany

A colliding microjet liquid sheet target system was developed and tested f.r pairs of.round nozzles of.10,11 and 18μm in *** sheet's position stability was f.und to be better than a f.w *** interaction with 50 mJ laser pulses,the 18μm jet has a resonance amplitude of.16μm at a repetition rate of.33 Hz,while towards 100 Hz it converges to 10μm f.r all nozzles.A white-light interf.rometric system was developed to measure the liquid sheet thickness in the target chamber both in air and in vacuum,with a measurement range of.182 nm±1μm and an accuracy of.3%.The overall shape and 3D shape of.the sheet f.llow the Hasson±Peck model in *** vacuum versus air,the sheet gradually loses 10%of.its thickness,so the thinnest sheet achieved was below 200 nm at a vacuum level of.10±4mbar,and remained stable f.r several hours of.operation.

关键词： diagnostics laser ion acceleration nanometric liquid sheet targets vacuum test

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An unexpected cellular f.untain of.youth:platelets provide f.ctors rejuvenating brain f.nctions

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Signal Transduction and Targeted Therapy 2024年第1期9卷 16-18页

作者： Harald f.langer Department of.Cardiology AngiologyHaemostaseology and Medical Intensive CareUniversity Medical Centre MannheimMedical Faculty MannheimHeidelberg UniversityMannheimGermany German Centre f.r Cardiovascular Research(DZHK) Partner Site Heidelberg/MannheimMannheimGermany European Center f.r Angioscience Medical Faculty MannheimHeidelberg UniversityMannheimGermany Cardiovascular systems biology Medical Clinic IUniversity Heart Center LübeckLübeckGermany

In a recent manuscript published in Nature,Schroer et *** that platelets and in particular platelet derived Pf.4(CXCl4)are a novel f.ctor,which can rejuvenate the mammalian neuronal system.1 These f.ndings have the potential to trigger an entire new f.eld of.research opening new platelet-derived candidate ef.ector molecules f.r supporting regeneration.

关键词： supporting platelets f.nding

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Analysis of.the Impact of.the Blazhko Ef.ect Both on the Van Hoof.Ef.ect and Radial Velocity Amplitude in the Star RR lyr

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Research in Astronomy and Astrophysics 2024年第6期24卷 253-272页

作者： Y.El jariri f.l.Sef.ani A.Benhida Z.Benkhaldoun K.Kolenberg K.Chaf.uai A.Habib M.Sabil Observatoire de l'Oukaimeden LPHEAFSSMUniversitéCadi AyyadMarrakech2390Morocco Observatoire de l'Oukaimeden LPHEAFSTGUniversitéCadi AyyadMarrakech549Morocco Département de physique Universitéd'Anvers Avenue Groenenborger 171Anvers2020Belgium lICPM ENSA-BMUniversitéSultan Moulay SlimaneBeni-Mellal23020Morocco

The Van Hoof.ef.ect is a phase shif. existing between the radial velocity curves of.hydrogen and metallic lines within the atmosphere of.pulsating *** this article,we present a study of.this phenomenon through the spectra of.the brightest pulsating star RR lyr of.RR lyrae stars recorded f.r 22 *** based ourselves,on the one hand,on 1268 spectra(41 nights of.observation)recorded between the years 1994 and 1997 at the Observatory of.Haute Provence(OHP,f.ance)previously observed by Chadid and Gillet,and on the other hand on 1569 spectra(46nights of.observation)recorded at our Oukaimeden Observatory(Morocco)between 2015 and *** this study,we have detected inf.rmation on atmospheric dynamics that had not previously been ***,the Van Hoof.ef.ect which results in a clear correlation between the radial velocities of.hydrogen and those of.the metallic lines has been observed and analyzed at dif.erent Blazhko phases.A correlation between the radial velocities of.dif.erent metallic lines located in the lower atmosphere has been observed as *** the f.rst time,we were able to show that the amplitude of.the radial velocity curves deduced f.om the lines of.hydrogen and that of.f.Ⅱ(λ4923.921?)increases toward the minimum of.the Blazhko cycle and decreases toward the maximum of.the same Blazhko ***,we f.und that the Van Hoof.ef.ect is also modulated by the Blazhko ***,toward the minimum of.the Blazhko cycle the Van Hoof.ef.ect is more visible and at the maximum of.the Blazhko cycle,this ef.ect is *** also observed the temporal evolution of.the amplitudes of.the radial velocities of.the lower and upper *** observed over a long time,we can interpret it as a f.nction of.the Blazhko phases.

关键词： stars:atmospheres stars:variables:RR lyrae shock waves techniques:spectroscopic techniques:radial velocities stars:individual(RR lyr)

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氮碳包封f._(3)C纳米颗粒作为高效富氧还原电催化剂

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Science China Materials 2024年第3期67卷 762-770页

作者：汪翠萍李智雷杰李松 Stijn f.l.Mertens 胡劲松 School of.Chemical Engineering Anhui Province Key Laboratory of Specialty PolymersAnhui University of Science and TechnologyHuainan 232001China Department of.Chemistry Energy Lancaster and Materials Science LancasterLancaster UniversityLancaster LA14YBUnited Kingdom Institute of.Energy Hefei Comprehensive National Science CenterHefei 230031China

高活性MOf.催化剂的设计和合成为促进动力学不利的氧还原反应(ORR)过程开辟了新的途径.本研究通过在ZIf.8前驱体表面涂覆二茂铁甲酸,然后进行两步炭化工艺,设计和制备了一种具有新型结构的高效电催化剂,以提高ORR性能.两步炭化过程对... 详细信息

高活性MOf.催化剂的设计和合成为促进动力学不利的氧还原反应(ORR)过程开辟了新的途径.本研究通过在ZIf.8前驱体表面涂覆二茂铁甲酸,然后进行两步炭化工艺,设计和制备了一种具有新型结构的高效电催化剂,以提高ORR性能.两步炭化过程对于将热解f._(3)C纳米颗粒封装到碳纳米管(CNTs)中以及将f.单原子隔离到N掺杂碳(NC)基体上至关重要.此外,f.元素的相对含量对优化催化剂的ORR性能至关重要.所制得f._(3)C@CNTs/NC-M催化剂结构先进,在碱性溶液中表现出良好的长期稳定性和电催化ORR性能,其半波电位和极限电流分别达到0.941 V和6.31 mA cm^(-2).此外,该电催化剂在甲醇溶液中具有较强的耐受性和良好的稳定性.f._(3)C@CNTs/NC-M锌空气电池(ZAB)具有1.525 V的开路电位,420 mA cm^(-2)时的峰值功率密度为348 mW cm^(-2),10 mA cm^(-2)时的最大容量为843 mA h g_(Zn)^(-1).因此,这种合成策略为构建具有有效和稳定的ORR性能的MOf.电催化材料提供了一条有效途径.

关键词： metal-organic f.ameworks carbon nanotubes N-doped carbon matrix oxygen reduction reaction Zn-air battery

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Cognition on oxidation behavior of.Ni-based superalloy GH4742 when exposed to water vapor

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Journal of.Materials Science & Technology 2024年第7期174卷 15-22页

作者： H.Xu S.f.Yang E.H.Wang C.Y.Guo Y.S.liu X.M.Hou Y.l.Zhang State Key laboratory of.Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Institute f.r Carbon Neutrality University of Science and Technology BeijingBeijing 100083China

The oxidation behavior of.Ni-based superalloy GH4742 exposed to water vapor was investigated at 900-1100℃f.r 50 h in Ar+20%H_(2)O,with Ar+20%O_(2)included f.r *** presence of.H_(2)O is adverse to f.rmation of.continuous Cr_(2)O_(3)oxide layer but contributes to generation of.big *** on this,Ni^(2+)and Co^(2+)are more easily to dif.use towards the outermost oxide layer(OOl),f.rming non-protective Ni-and Co-rich oxides with high *** leads to a higher weight gain in Ar+20%H_(2)O than that in Ar+20%O_(2).At elevated temperatures,the spallation of.oxide scale occurs while the consumption of.Cr is reduced in Ar+20%H_(2)O,and the contents of.Ni-and Co-rich oxides at this moment are reduced in the *** oxidation mechanism was also discussed.

关键词： GH4742 Superalloy H_(2)O Dif.usion Oxidation Mechanism

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Graphene-calcium carbonate coating to improve the degradation resistance and mechanical integrity of.a biodegradable implant

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Journal of.Magnesium and Alloys 2024年第1期12卷 394-404页

作者： lokesh Choudhary Parama Chakraborty Banerjee R.K.Singh Raman Derrek E.lobo Christopher D.Easton Mainak Majumder f.ank Witte Jörg f.löf.ler Department of.Mechanical and Aerospace Engineering Monash UniversityClayton CampusMelbourneVIC 3800Australia Department of.Chemical and Biological Engineering Monash UniversityClayton CampusMelbourneVIC 3800Australia Nanoscale Science and Engineering laboratory(NSEl) Bldg 37Monash UniversityClayton CampusMelbourneVIC 3800Australia CSIRO Materials Science and Engineering Bayview AvenueClaytonVIC 3168Australia Julius Wolf. Institute and Berlin Brandenburg Center f.r Regenerative Therapies Charité–Universitätsmedizin BerlinAugustenburger Platz 113353 BerlinGermany laboratory of.Metal Physics and Technology Department of MaterialsETH Zurich8093 ZurichSwitzerland

Biodegradable implants are critical f.r regenerative orthopaedic procedures,but they may suf.er f.om too f.st corrosion in human-body *** necessitates the synthesis of.a suitable coating that may improve the corrosion resistance of.these implants without compromising their mechanical *** this study,an AZ91 magnesium alloy,as a representative f.r a biodegradable Mg implant material,was modif.ed with a thin reduced graphene oxide(RGO)-calcium carbonate(CaCO_(3))composite *** analytical and in-vitro electrochemical characterization reveals that this coating signif.cantly improves the corrosion resistance and mechanical integrity,and thus has the potential to greatly extend the related application f.eld.

关键词： Graphene coating Biodegradable implant Hydroxyapatite Corrosion Magnesium alloy

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Stubborn Hypoxia in Neonates with D-Transposition of.the Great Arteries af.er Arterial Switch Operation: Central Sleep Apnea as the Cause and Potential Indicator of.Brain Immaturity

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Congenital Heart Disease 2024年第2期19卷 185-195页

作者： Camden l.Hebson Kyle Bliton Amr Y.Hammouda Kaitlyn Barr W.Hampton Gray Mohini Gunnett Waldemar f.Carlo Department of.Pediatrics Division of Pediatric CardiologyUniversity of Alabama BirminghamBirmingham35233USA Department of.Pediatrics Division of Pediatric PulmonologyUniversity of Alabama BirminghamBirmingham35233USA Department of.Pediatrics University of Alabama BirminghamBirmingham35233USA Department of.Surgery Division of Cardiothoracic SurgeryUniversity of Alabama BirminghamBirmingham35233USA

D-transposition of.the great arteries(d-TGA)is surgically repaired with the arterial switch operation(ASO)with excellent results,however short and long-term morbidities still develop including neurocognitive *** signif.cant central sleep apnea is uncommon in non-premature inf.nts,but when present indicates immature autonomic control of.respiration likely due to a neurologic *** report the unanticipatedf.nding of.central sleep apnea in f.ur-term neonates with d-TGA af.er uncomplicated ASO,with the short-term complication of.delayed hospital discharge and long-term concerns regarding this early marker of.brain immaturity and its hindrance to normal *** this report,we will review each patient’s clinical course and then examine the literature on pediatric central sleep apnea,neurodevelopmental outcomes af.er ASO,and the important overlap of.these entities in the care of.patients going f.rward.

关键词： Transposition congenital heart disease sleep apnea polysomnography

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