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Towards implementation of alloy-specific thermo-fluid modelling for laser powder-bed fusion of mg alloys

Journal of magnesium and Alloys 2024年第6期12卷 2327-2344页

作者： mohammad Hoseini-Athar mikael Ersson peter Hedström Department of material Science and Engineering KTH Royal Institute of TechnologyStockholmSE-10044 Sweden

multi-physics thermo-fluid modeling has been extensively used as an approach to understand melt pool dynamics and defect formation as well as optimizing the process-related parameters of laser powder-bed fusion(L-pBF).However,its capabilities for being implemented as a reliable tool for material design,where minor changes in material-related parameters must be accurately captured,is still in *** the present research,first,a thermo-fluid computational fluid dynamics(CFD)model is developed and validated against experimental *** the predicted material properties of the pure mg and commercial ZK60 and WE43 mg alloys,parametric studies are done attempting to elucidate how the difference in some of the material properties,i.e.,saturated vapor pressure,viscosity,and solidification range,can influence the melt pool *** is found that a higher saturated vapor pressure,associated with the ZK60 alloy,leads to a deeper unstable keyhole,increasing the keyhole-induced porosity and evaporation mass *** viscosity and wider solidification range can increase the non-uniformity of temperature and velocity distribution on the keyhole walls,resulting in increased keyhole instability and formation of ***,the WE43 alloy showed the best behavior in terms of defect formation and evaporation mass loss,providing theoretical support to the extensive use of this alloy in *** summary,this study suggests an approach to investigate the effect of materials-related parameters on L-pBF melting and solidification,which can be extremely helpful for future design of new alloys suitable for L-pBF.

关键词： mg alloys Laser powder-bed fusion(L-pBF) melt pool dynamics Computational fluid dynamics Fluid flow

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A flexible,thin-film microchannel electrode array device for selective subdiaphragmatic vagus nerve recording

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microsystems & Nanoengineering 2024年第1期10卷 115-128页

作者： Jongcheon Lim peter A.Zoss Terry L.powley Hyowon Lee matthew p.Ward Weldon School of Biomedical Engineering Purdue UniversityWest LafayetteINUSA Birck Nanotechnology Center Purdue UniversityWest LafayetteINUSA Center for Implantable Devices Purdue UniversityWest LafayetteINUSA Department of psychological Sciences Purdue UniversityWest LafayetteINUSA purdue Institute of Integrative Neuroscience Purdue UniversityWest LafayetteINUSA Indiana University School of medicine IndianapolisINUSA

The vagus nerve(VN)plays an important role in regulating physiological conditions in the gastrointestinal(GI)tract by communicating via the parasympathetic pathway to the enteric nervous system(ENS).However,the lack of knowledge in the neurophysiology of the VN and GI tract limits the development of advanced treatments for autonomic dysfunctions related to the *** better understand the complicated underlying mechanisms of the VN-GI tract neurophysiology,it is necessary to use an advanced device enabled by microfabrication *** several candidates including intraneural probe array and extraneural cuff electrodes,microchannel electrode array devices can be used to interface with smaller numbers of nerve fibers by securing them in the separate channel *** microchannel electrode array devices to interface teased nerve structures are relatively bulky with thickness around 200µ*** thick design can potentially harm the delicate tissue structures,including the nerve *** this paper,we present a flexible thin film based microchannel electrode array device(thickness:11.5µm)that can interface with one of the subdiaphragmatic nerve branches of the VN in a *** demonstrated recording evoked compound action potentials(ECAp)from a transected nerve ending that has multiple nerve ***,our analysis confirmed that the signals are from C-fibers that are critical in regulating autonomic neurophysiology in the GI tract.

关键词： electrode recording film

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Spatial and temporal patterns of sarcoptic mange in wombats using the citizen science tool,WomSAT

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Integrative Zoology 2024年第3期19卷 387-399页

作者： Sujatha mAYADUNNAGE Hayley Jade STANNARD peter WEST Julie m.OLD School of Science Western Sydney UniversityHawkesburyNSWAustralia School of Agricultural Environmental and Veterinary SciencesCharles Sturt UniversityWagga WaggaNSWAustralia Department of primary Industries Orange Agricultural InstituteOrangeNSWAustralia

There is currently limited information regarding the levels of infection and distribution of sarcoptic mange in the wombat population throughout *** analyzed cases of sarcoptic mange in bare-nosed wombats reported into WomSAT,a website and mobile phone application where citizen scientists can upload sightings of wombats,burrows,and sarcoptic mange *** used maxent software to predict locations and the environmental factors associated with sarcoptic mange occurrence in bare-nosed wombats.A total of 1379 sarcoptic mange-infected and 3043 non-sarcoptic mange-infected wombats were reported by 674 and 841 citizen scientists,*** all the wombats reported to WomSAT from 2015 to 2019,31.2%were infected with sarcoptic *** mange in bare-nosed wombats was reported in 502 suburbs across four *** South Wales had the highest number of sarcoptic mange cases reported to *** was no statistically significant seasonal variation of sarcoptic mange levels in bare-nosed *** model showed that Euclidean distance to urban areas was the highest contributing factor for sarcoptic mange *** distance to urban areas decreased,the suitability for sarcoptic mange *** precipitation was the next contributing factor in the model,with higher rainfall of 400–700 mm correlating to an increase in sarcoptic mange *** the data collected to date have provided the largest-scale contemporary distribution of sarcoptic mange in wombats,data should continue to be collected by citizen scientists as it is an easy and low-cost method of collecting data over large *** suggest targeting the identified hotspot areas and more site-specific studies for studying and mitigating sarcoptic mange in bare-nosed wombats.

关键词： bare-nosed wombats habitat suitability maxent modeling

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Cannabinoids and endocannabinoids as therapeutics for nervous system disorders:preclinical models and clinical studies

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Neural Regeneration Research 2024年第4期19卷 788-799页

作者： R.Scott Duncan Sean m.Riordan matthew C.Gernon peter Koulen Department of Ophthalmology School of MedicineUniversity of Missouri Department of Biomedical Sciences School of MedicineUniversity of Missouri

Cannabinoids are lipophilic substances derived from Cannabis sativa that can exert a variety of effects in the human *** have been studied in cellular and animal models as well as in human clinical trials for their therapeutic benefits in several human *** of these include central nervous system(CNS)diseases and dysfunctions such as forms of epilepsy,multiple sclerosis,parkinson’s disease,pain and neuropsychiatric *** addition,the endogenously produced cannabinoid lipids,endocannabinoids,are critical for normal CNS function,and if controlled or modified,may represent an additional therapeutic avenue for CNS *** review discusses in vitro cellular,ex vivo tissue and in vivo animal model studies on cannabinoids and their utility as therapeutics in multiple CNS *** addition,the review provides an overview on the use of cannabinoids in human clinical trials for a variety of CNS *** and endocannabinoids hold promise for use as disease modifiers and therapeutic agents for the prevention or treatment of neurodegenerative diseases and neurological disorders.

关键词： anandamide cannabidiol cannabinoid endocannabinoid epilepsy multiple sclerosis neurodegeneration neuroprotection tetrahydrocannabinol

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Recent advances and opportunities in mXene-based liquid crystals

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Infomat 2024年第3期6卷 1-21页

作者： Ken Aldren S.Usman Jizhen Zhang Kevinilo p.marquez mia Angela N.Judicpa peter A.Lynch Annabelle Bedford Babak Anasori Joselito m.Razal Institute for Frontier materials Deakin UniversityGeelongVictoriaAustralia manufacturing Commonwealth Scientific and Industrial Research Organization(CSIRO)Waurn PondsVictoriaAustralia Institute of Chemistry University of the Philippines-Los BañosLagunaPhilippines School of materials Engineering Purdue UniversityWest LafayetteIndianaUSA Department of mechanical and Energy Engineering Indiana University-Purdue UniversityIndianapolisIndianaUSA

The recent progress on the liquid crystalline(LC)dispersion of two-dimensional(2D)transition metal carbides(mXenes)has propelled this unique nanomaterial into a realm of high-performance architectures,such as films and ***ally,compared to architectures made from typical non-LC dispersions,those derived from LC mXene possess tunable ion transport routes and enhanced conductivity and physical properties,demonstrating great potential for a wide range of applications,such as electronic displays,smart glasses,and thermal camouflage *** review provides an overview of the progress achieved in the production and processing of LC mXenes,including critical discussions on satisfying the required conditions for LC *** also highlights how acquiring LC mXenes has broadened the current solution-based manufacturing paradigm of mXene-based architectures,resulting in unprecedented performances in their conventional applications(e.g.,energy storage and strain sensing)and in their emerging uses(e.g.,tribology).Opportunities for innovation and foreseen challenges are also discussed,offering future research directions on how to further benefit from the exciting potential of LC mXenes with the aim of promoting their widespread use in designing and manufacturing advanced materials and applications.

关键词： liquid crystals multi-functional materials mXenes solution-based processing

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Adaptation in brain structure and respiratory and olfactory structures across environmental gradients in African and North American muroid rodents

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Integrative Zoology 2024年第1期19卷 165-181页

作者： peter J.TAYLOR Aluwani NENGOVHELA Christiane DENYS Graham R.SCOTT Catherine m.IVY Department of Zoology School of Natural and Mathematical SciencesUniversity of VendaThohoyandouSouth Africa Afromontane Unit Department of Zoology and EntomologyUniversity of the Free StatePhuthaditjhabaSouth Africa Department of mammalogy National MuseumBloemfonteinSouth Africa Institut de Systématique EvolutionBiodiversité(ISYEB)Muséum National d’Histoire NaturelleCNRSSorbonne UniversitéEPHEUniversitéDes AntillesParisFrance Department of Biology McMaster UniversityHamiltonOntarioCanada Guglielmo and Shoemaker Labs Advanced Facility for Avian ResearchUniversity of Western OntarioLondonOntarioCanada

morphometric studies of 3D micro CT-scanned images can provide insights into the evolution of the brain and sensory structures but such data are still scarce for the most diverse mammalian order of *** reviewed and new data,we tested for convergence to extreme aridity and high elevation in the sensory and brain morphology of rodents,from morphometric data from micro-CT X-ray scans of 174 crania of 16 species of three distantly re-lated African murid(soft-furred mice,praomyini,laminate-toothed rats,Otomyini,and gerbils,Gerbillinae)clades and one North American cricetid(deer mice and white-footed mice,peromyscus)*** studies demon-strated convergent evolution acting on the oval window area of the cochlea(enlarged in extremely arid-adapted species of Otomyini and Gerbillinae)and on endocranial volume(reduced in high elevation taxa of Otomyini and peromyscus).However,contrary to our predictions,we did notfind evidence of convergence in brain struc-ture to aridity,or in the olfactory/respiratory system(turbinate bones)to high *** structure differed,particularly in the petrosal lobules of the cerebellum and the olfactory bulbs,between Otomyini and Gerbillinae,with extreme arid-adapted species in each clade being highly divergent(not convergent)from other species in the same *** observed greater“packing”of the maxillary turbinate bones,which have important respiratory functions,in peromyscus mice from high and low elevations compared to the high-elevation African praomyini,but more complex patterns within peromyscus,probably related to trade-offs in respiratory physiology and heat exchange in the nasal epithelium associated with high-elevation adaptation.

关键词： 3D morphometrics Africa brain size North America Rodentia sensory evolution

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Highly-sensitive wafer-scale transfer-free graphene mEmS condenser microphones

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microsystems & Nanoengineering 2024年第1期10卷 267-275页

作者： Roberto pezone Sebastian Anzinger Gabriele Baglioni Hutomo Suryo Wasisto pasqualina m.Sarro peter G.Steeneken Sten Vollebregt Laboratory of Electronic Components Technology and Materials(ECTM)Department of MicroelectronicsDelft University of TechnologyDelftThe Netherlands Infineon Technologies AG Am Campeon 1-15Neubiberg 85579Germany Kavli Institue of Nanoscience Department of Quantum NanoscienceDelft University of TechnologyDelftthe Netherlands Department of precision and microsystems Engineering(pmE) Delft University of TechnologyDelftThe Netherlands

Since the performance of micro-electro-mechanical system(mEmS)-based microphones is approaching fundamental physical,design,and material limits,it has become challenging to improve *** works have demonstrated graphene’s suitability as a microphone *** potential for achieving smaller,more sensitive,and scalable onchip mEmS microphones is yet to be *** address large graphene sizes,graphene-polymer heterostructures have been proposed,but they compromise performance due to added polymer mass and *** work demonstrates the first wafer-scale integrated mEmS condenser microphones with diameters of 2R=220-320μm,thickness of 7 nm multi-layer graphene,that is suspended over a back-plate with a residual gap of 5μ*** microphones are manufactured with mEmS compatible wafer-scale technologies without any transfer steps or polymer layers that are more prone to contaminate and wrinkle the *** designs,all electrically integrated are fabricated and characterized allowing us to study the effects of the introduction of a back-plate for capacitive *** devices show high mechanical compliances C_(m)=0.081-1.07μmpa^(−1)(10-100×higher than the silicon reported in the state-of-the-art diaphragms)and pull-in voltages in the range of 2-9.5 *** addition,to validate the proof of concept,we have electrically characterized the graphene microphone when subjected to sound *** estimated sensitivity of S_(1kHz)=24.3-321 mV pa^(−1)for a V_(bias)=1.5 V was determined,which is 1.9-25.5×higher than of state-of-the-art microphone devices while having a~9×smaller area.

关键词： transfer plate approaching

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Ultrafast magneto-optical dynamics in nickel(111)single crystal studied by the integration of ultrafast reflectivity and polarimetry probes

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Chinese physics B 2024年第3期33卷 65-69页

作者：匡皓余军潇陈洁 H.E.Elsayed-Ali 李润泽 peter m.Rentzepis School of physical Science and Technology ShanghaiTech UniversityShanghai 201210China Center for Transformative Science ShanghaiTech UniversityShanghai 201210China Center for Ultrafast Science and Technology Key Laboratory for Laser Plasmas (Ministry of Education)Collaborative Innovation Center of IFSA (CICIFSA)School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Department of Electrical and Computer Engineering Old Dominion UniversityNorfolkVirginia 23529USA Department of Electrical and Computer Engineering Texas A&M UniversityCollege StationTexas 77843USA

With the integration of ultrafast reflectivity and polarimetry probes,we observed carrier relaxation and spin dynamics induced by ultrafast laser excitation of Ni(111)single *** carrier relaxation time within the linear excitation range reveals that electron-phonon coupling and dissipation of photon energy into the bulk of the crystal take tens of *** the other hand,the observed spin dynamics indicate a longer time of about 120 *** further understand how the lattice degree of freedom is coupled with these dynamics may require the integration of an ultrafast diffraction probe.

关键词： ultrafast spin dynamics non-equilibrium dynamics multi-probe

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Feasibility,efficacy,and safety of animal-assisted activities with visiting dogs in inpatient pediatric oncology

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World Journal of pediatrics 2024年第9期20卷 915-924页

作者： Katja Steff maximilian Grasemann Kira Ostermann Sarah Christina Goretzki peter-michael Rath Dirk Reinhardt michael m.Schündeln pediatric Hematology and Oncology Department of Pediatrics IIIUniversity of Duisburg-EssenHufelandstr.5545122EssenGermany Department of psychology Medical School HamburgHamburgGermany pediatric Infectiology Department of Pediatrics IUniversity of Duisburg-EssenEssenGermany Institute of medical microbiology University of Duisburg-EssenEssenGermany

Background Childhood cancer entails a heavy burden for patients and their *** advances in overall survival rates have increasingly brought long-term quality of life into ***-assisted activities(AAAs)have long been hypothesized to alleviate the burden on pediatric patients and their peers in the hospital ***,their use in inpatient pediatric oncology has been a sensitive issue mainly due to the fear of infections,resulting in a lack of *** study presents data on the feasibility,safety,and efficacy of AAAs from a single German *** Between 2018 and 2022,60 patients(median age=10.3 years)diagnosed with malignancy and undergoing treatment were visited by an intervention dog(total visits=100).patients were screened for infections as per hospital policy,with additional microbiological testing performed based on *** dog was screened for human pathogens and *** data and hospitalizations were analyzed from two months prior to the first visit until two months after the last *** of being in the hospital,both with and without planned animal-assisted interventions and pre-and post-intervention state stress,were measured using a validated visual analogue scale(0-10).Results patients benefited from AAAs,showing increased acceptance of being in the hospital(median:7.25 vs.4.50,pmedian state stress ratings one hour after the visit compared to one hour before the visit(1.00 vs.4.25,pmber of infections or unplanned hospitalizations,and no zoonoses were *** microbial screening tests of the dog were *** AAAs with visiting dogs in inpatient pediatric oncology are feasible and *** they hold promise for enhancing patients’well-being,further prospective studies are needed.

关键词： Animal-assisted activities Animal-assisted interventions Animal-assisted therapy Feasibility Infection control Inpatient pediatric oncology Safety Stress response Therapy dog Visiting dog

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Gene complementation analysis indicates that parasitic dodder plants do not depend on the host FT protein for flowering

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plant Communications 2024年第5期5卷 104-108页

作者： Sina mackelmann Andrea Kanel Lara m.Kosters peter Lyko Dirk prufer Gundula A.Noll Susann Wicke Institute of plant Biology and Biotechnology University of MuensterSchlossplatz 848143 MuensterGermany Institute for Biology Humboldt-University of BerlinHaus 22Philippstr.1310115 BerlinGermany Fraunhofer Institute for molecular Biology and Applied Ecology ImE Schlossplatz 848143 MuensterGermany

Dear Editor,Cuscuta,a genus of parasitic plants,poses a significant threat to global agriculture due to its broad host range that encompasses numerous cultivated *** plants form specialized feeding organs(haustoria)that connect to the host vascular tissue and import water,nutrients,secondary metabolites,small RNAs,mRNAs,and *** such protein is FT,a peptide hormone and florigen that was recently proposed to cause the synchronization of flowering in the parasite–host system(Shen et al.,2020).

关键词： specialized organs analysis

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