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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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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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美国2001年9月11日世贸中心被攻击后的环境研究

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地壳构造与地壳应力 2013年第2期 1-24页

作者： Roger N.Clark Robert O.Green Gregg A.Swayze Greg meeker Steve Sutley Todd m.Hoefen K.Eric Livo Geoff Plumlee Betina Pavri Chuck Sarture Steve Wilson Phil Hageman Paul Lamothe J.Sam Vance Joe Boardman Isabelle Brownfield Carol Gent Laurie C.morath Joseph Taggart peter m.theodorakos monique Adams 李强 U.S.GeologicalSurvey Jet Propulsion Lab Pasadena U.S.Environmental Protection Agency Region & Denver Analytical Imaging and Geophysics

本文主要介绍了2001年9月11日世界贸易中心(WTC)被攻击之后在各学科领域的环境特征研究结果。文中提交的信息被世界贸易中心应急小组在2001年9月18日(热点信息)和2001年9月27日(制图和组成成分结果研究)使用。实验数据由喷气推进实验室... 详细信息

本文主要介绍了2001年9月11日世界贸易中心(WTC)被攻击之后在各学科领域的环境特征研究结果。文中提交的信息被世界贸易中心应急小组在2001年9月18日(热点信息)和2001年9月27日(制图和组成成分结果研究)使用。实验数据由喷气推进实验室/美国航空航天局(JPL/NASA)于2001年9月16、18、22、23日在世界贸易中心(WTC)通过机载可见光/红外成像光谱仪(AVIRIS)的高光谱遥感仪器获得。2001年9月17日和18日晚上,由两人组成的美国地质勘探局小组在世界贸易中心方圆1km之内收集了超过35个位置点的粉尘和空降碎片样品,其中为了避免受9月14日的暴雨影响选择了两个室内样本收集点,另外还收集到了两个有钢梁涂层的世贸残骸样品。美国地质勘探局地面工作人员在白天进行了实地反射光谱测量,用于现场校准AVIRIS遥感数据。AVIRIS数据的辐射定标和校正工作在喷气推进实验室/美国航空航天局(JPL/NASA)完成;表面反射率校准、光谱测图和解译工作在位于丹佛市的美国地质调查局成像光谱实验室完成;灰尘/碎屑和钢梁涂层样品的各种矿物学和化学参数的分析工作,在位于科罗拉多州丹佛市的美国地质调查局实验室完成,分析中使用了反射光谱法(RS)、扫描电子显微镜检查法(SEm)以及X射线衍射法(XRD)等。通过分析研究得出以下几个重要结论:(1)世贸中心大楼倒塌释放的粉尘主要有:玻璃纤维、石膏、混凝土、纸张以及其他建筑施工中常用的混合材料。(2)在实验室用RS、SEm和XRD方法分析发现,在三分之二以上的灰尘和空降碎片样本中只检测到微量的温石棉(小于总重量的1%),而到目前为止在所有粉尘样品中还没有检测到角闪石类石棉矿物。(3)对钢梁涂层样品分析发现,在世贸中心碎片中检测到的温石棉(蛇纹石矿物)占涂层材料总体积的比例高达20%,同样在这些钢梁涂层样品中也没有检测到角闪石类石棉矿物。(4)在地面仪器低百分比检测的限制下,AVIRIS矿物图主要是用来检测可能存在的石棉状矿物,图中并没有显示温石棉或闪石类石棉的大范围分布。从图中的孤立像素点或像素群(像素大小约2m×2m)可以看出,世贸中心周围地区的石棉状矿物含量变化范围大,从百分之几到百分之几十都有可能。由于AVIRIS数据中的某些光谱吸收强度和温石棉钢梁涂层的光谱相似,因此吸收特征图只显示出了蛇纹石矿物的存在,而不能说明蛇纹石是石棉状的,因为非石棉状蛇纹石矿物在建筑材料中也是非常常见的。AVIRIS矿物图可以显示含石棉量较高的区域和小范围非石棉状矿物的区域,但需要通过现场采样和实验分析来验证石棉的存在。另外,AVIRIS矿物图只能检测地表矿物,而不能检测地下掩埋的矿物。(5)AVIRIS矿物图中角闪石类矿物是几个孤立像素点,而不是像温石棉那样的像素群。少数几个世贸中心地区的角闪石像素点和整个城市的角闪石像素统计噪声水平相似。AVIRIS吸收特征图只显示了角闪石矿物的存在,而这些在非石棉状建筑材料中也是非常常见的,所以需要进行现场采样来确认石棉的存在。野外样品的实验室分析结果与矿物图上的蛇纹石温石棉和角闪石矿物是一致的。(6)实验分析和AVIRIS矿物图结果表明,无论是小尺度的个别样品,还是世贸中心一定方向和距离范围的大空间尺度,粉尘的成分都是多变的。通过对同一样品多次重复进行矿物学和化学物质分析发现,多变性可能是因为粉尘是由不同材料的不均匀混合造成的,这种空间差异是在几十米的大尺度到厘米甚至更小尺度范围下观测到的。AVIRIS矿物图还显示了位于东南偏南的2号大楼倒塌中心的物质铁含量较高,温石棉的分布主要(但并不唯一)呈向西和北方向不连续的放射状,也可能分布在超过世贸大厦遗址四分之三公里的东方向。(7)迄今为止,在粉尘和空降样品中只检测到微量的温石棉,但在有钢梁涂层的世贸中心碎片中温石棉含量达到总体积的20%之多,而且AVIRIS矿物图中温石棉可能存在的区域也表明在局部点可能发现石棉。(8)2001年9月16日收集到的AVIRIS数据显示,世贸中心大楼倒塌区域有若干热点存在,在核心区就有超过36个不同大小和温度的热点。分析数据发现,这些热点的温度都高于800°F,有些甚至超过了1300°F。截止到9月23日,从飞机上观察到的火灾点大部分已经消除或者减弱。(9)我们通过实验发现的灰尘样品有微量石棉的结论与美国环保署(***)进行的其他研究结果一致。我们的研究结果也进一步说明:①高含量石棉可能存在于钢梁涂层和AVIRIS矿物图中显示的局部区域;②粉尘和钢梁涂层中的石棉只含有温石棉,而不含有角闪石类石棉。根据毒理学专家、流行病学专家和矿物学专家近20年分析研究的主要成果表明,闪石类石棉矿物比温石棉更易致癌(Ross,1999;Skinner等,1988;Van Oss等,19

关键词：美国航空航天局世贸中心环境特征攻击喷气推进实验室世界贸易中心红外成像光谱仪美国地质勘探局

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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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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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High-Performance and Large-Area Inverted Perovskite Solar Cells Based on NiO_(x) Films Enabled with A Novel microstructure-Control Technology

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Energy & Environmental materials 2024年第1期7卷 153-159页

作者： Guibin Shen Xin Li Yuqin Zou Hongye Dong Dongping Zhu Yanglin Jiang Xin Ren Ng Fen Lin peter müller-Buschbaum Cheng mu Key Laboratory of Advanced Light Conversion materials and Biophotonics Department of ChemistryRenmin University of ChinaBeijing 100872China Solar Energy Research Institute of Singapore(SERIS) National University of SingaporeSingapore 117574Singapore Physik-Department Lehrstuhl für Funktionelle MaterialienTechnische Universität MünchenJames-Franck-Straße 185748Garching Germany Heinz maier-Leibnitz Zentrum(mLZ) Technische Universität MünchenLichtenbergstr.185748Garching Germany

The improvement in the efficiency of inverted perovskite solar cells(PSCs)is significantly limited by undesirable contact at the NiO_(x)/perovskite *** this study,a novel microstructure-control technology is proposed for fabrication of porous NiO_(x)films using Pluronic P123 as the structure-directing agent and acetylacetone(AcAc)as the coordination *** synthesized porous NiO_(x)films enhanced the hole extraction efficiency and reduced recombination defects at the NiO_(x)/perovskite ***,without any modification,the power conversion efficiency(PCE)of the PSC with mAPbl_(3)as the absorber layer improved from 16.50%to 19.08%.moreover,the PCE of the device composed of perovskite Cs0.05(mA_(0.15)FA_(0.85))_(0.95)Pb(I_(0.85)Br_(0.15))_(3)improved from 17.49%to 21.42%.Furthermore,the application of the fabricated porous NiO_(x)on fluorine-doped tin oxide(FTO)substrates enabled the fabrication of large-area PSCs(1.2 cm^(2))with a PCE of 19.63%.This study provides a novel strategy for improving the contact at the NiO_(x)/perovskite interface for the fabrication of high-performance large-area perovskite solar cells.

关键词： interfacial contact inverted and large-area perovskite solar cells photovoltaic materials porous NiO_(x)films renewable energy

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