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Computational discovery of ultra-strong, stable, and lightweight refractory multi-principal element alloys. Part II: comprehensive ternary design and validation

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npj Computational materials 2023年第1期9卷 1469-1481页

作者： kate l.m.elder Joel Berry Aurélien Perron Brandon Bocklund Jibril Shittu Connor J.Rietema Hunter B.Henderson Scott K.mcCall Joseph T.mcKeown materials Science Division Lawrence Livermore National LaboratoryLivermoreCA 94550USA.✉

Here the discovery of refractory multi-principal element alloys(mPEAs)with high-temperature strength and stability is pursued within a constrained and application-relevant design space.A comprehensive approach is developed and applied to explore all 165 ternary systems in the Al-Ce-Fe-Hf-mo-Nb-Ta-Ti-V-W-Zr family.A subset of ternary systems that contain large areas in composition–temperature space with high strength and robust BCC phase stability is *** sets of high-performing alloys are identified,each set optimized for one combination of phase constraint,optimization target,and temperature *** mechanical tests support the viability of the *** work highlights the importance of considering phase stability,exploring non-equiatomic regions of composition space,and applying application-relevant *** I and II provide three down-selection techniques for identifying high-performing BCC refractory mPEAs,design guidelines,and many candidates predicted to have BCC phase stability and strengths 2–3 times higher than any reported to date.

关键词： alloys element ternary

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The secondary injury cascade after spinal cord injury:an analysis of local cytokine/chemokine regulation

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Neural Regeneration Research 2024年第6期19卷 1308-1317页

作者： Daniel J.Hellenbrand Charles m.Quinn Zachariah J.Piper Ryan T.elder Raveena R.mishra Taylor l.marti Phoebe m.Omuro Rylie m.Roddick Jae Sung lee William l.murphy Amgad S.Hanna Department of Neurosurgery University of Wisconsin-Madison School of Medicine and Public HealthMadisonWIUSA Department of Biomedical Engineering University of Wisconsin-MadisonMadisonWIUSA Department of Orthopedics and Rehabilitation University of Wisconsin-MadisonMadisonWIUSA Department of materials Science and Engineering University of Wisconsin-MadisonMadisonWIUSA Forward BIO Institute University of Wisconsin-MadisonMadisonWIUSA

After spinal cord injury,there is an extensive infiltration of immune cells,which exacerbates the injury and leads to further neural ***,a major aim of current research involves targeting the immune response as a treatment for spinal cord *** much research has been performed analyzing the complex inflammatory process following spinal cord injury,there remain major discrepancies within previous literature regarding the timeline of local cytokine *** objectives of this study were to establish an overview of the timeline of cytokine regulation for 2 weeks after spinal cord injury,identify sexual dimorphisms in terms of cytokine levels,and determine local cytokines that significantly change based on the severity of spinal cord *** were inflicted with either a mild contusion,moderate contusion,severe contusion,or complete transection,7 mm of spinal cord centered on the injury was harvested at varying times post-injury,and tissue homogenates were analyzed with a Cytokine/Chemokine 27-Plex *** demonstrated pro-inflammatory cytokines including tumor necrosis factorα,interleukin-1β,and interleukin-6 were all upregulated after spinal cord injury,but returned to uninjured levels within approximately 24 hours post-injury,while chemokines including monocyte chemoattractant protein-1 remained upregulated for days *** contrast,several anti-inflammatory cytokines and growth factors including interleukin-10 and vascular endothelial growth factor were downregulated by 7 days *** spinal cord injury,tissue inhibitor of metalloproteinase-1,which specifically affects astrocytes involved in glial scar development,increased more than all other cytokines tested,reaching 26.9-fold higher than uninjured *** a mild injury,11 cytokines demonstrated sexual dimorphisms;however,after a severe contusion only leptin levels were different between female and male *** conclusion,pro-inflammatory cytokines in

关键词： astrocytes chemokines cytokines inflammation macrophages microglia secondary damage spinal cord injury

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Intermittent suckling with or without comingling of non-littermate piglets before weaning improves piglet performance in the immediate post-weaning period when compared with conventional weaning

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Journal of Animal Science and Biotechnology 2017年第3期8卷 721-732页

作者： Diana l.Turpin Pieter langendijk kate Plush John R.Pluske School of Veterinary and life Sciences Murdoch UniversityMurdochWA 6150Australia Trouw Nutrition Veerstraat 38Boxmeer 5831 iNThe Netherlands South Australian Research and Development Institute Roseworthy CampusJS Davis BuildingRoseworthySA 5371Australia Present address:SunPork Farms 563 Coleman RoadPinkerton PlainsSA 5400Australia

Background： In this experiment, intermittent suckling（IS） with or without the co-mingling（Co m） of piglets was studied as a method to stimulate solid feed intake and reduce post-weaning ***： Three weaning regimes using 30 multiparous sows were compared：（1） conventional weaning（CW）（n = 10 litters）, where piglets had continuous access to the sow until weaning（d 0, farrowing = d-25 relative to weaning）;（2） intermittent suckling（IS）（n = 10 litters）, where piglets were separated from the sow for 8 h/d starting at d-7（relative to weaning）; and（3） intermittent suckling with co-mingling（ISCo）（n = 10 litters） where IS started at d-7 and two litters were housed together during separation and then returned to their original sow. Ad libitum creep feed was available from d-17. At weaning pigs were housed in pens of 11 pigs, 27 pens in total. The ISCo treatment was divided in half to examine effects of different mixing strategies after weaning. Half of the ISCo litters were kept in familiar groups（ISCo F, familiar, n = 4） and the other half were mixed within treatment resulting in groups of unfamiliar pigs（ISCo NF, not familiar, n = 5）, the same as IS（n = 9） and CW（n = 9） ***： The ISCo piglets ate more creep feed in the week before weaning（P 〈 0.01）, but also showed more aggressive and manipulative behaviour on first day of Co m compared with CW piglets（P 〈 0.05）. IS with or without Co m increased exploratory and play behaviour on the first day of treatment intervention（P 〈 0.001） and increased sleeping behaviour on the last day of treatment intervention compared with CW（P 〈 0.001）. mixing strategy at weaning had an effect on performance data with the highest growth and feed intake seen in ISCo F pigs 2 to 8 d after weaning（P 〈0.001）. IS and ISCo NF pigs also grew faster and ate more than CW pigs 2 to 8 d after weaning（P 〈 0.001）. Post-weaning injury scores suggested reduced aggression in ISCo as evidenced by reduced redness（skin irritation）（P 〈 0.05）, a

关键词： Behaviour Co-mingling Intermittent suckling Piglet Weaning

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Gastroenterology in developing countries:Issues and advances

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World Journal of Gastroenterology 2009年第23期15卷 2839-2854页

作者： kate l mandeville Justus Krabshuis Nimzing Gwamzhi ladep Chris JJ mulder Eamonn mm Quigley Shahid A Khan Centre for Infectious Diseases Epidemiology Department of Primary Care and Population Sciences University College London Hampstead Campus Royal Free Hospital London NW3 2PF United Kingdom Highland Data Les Charleix 24390 Tourtoirac Dordogne France Department of medicine University of Jos and Jos University Teaching Hospital Jos Plateau State P.M.B. 2076 Nigeria Department of Gastroenterology VU University Medical Center Amsterdam 1081 HV Holland World Gastroenterology Organisation and Department of medicine National University of Ireland Cork University Hospital Clinical Sciences Building Wilton Cork Ireland Department of Hepatology and Gastro-enterology Faculty of Medicine Imperial College London St Mary's Campus London W2 1NY United Kingdom

Developing countries shoulder a considerable burden of gastroenterological disease. Infectious diseases in particular cause enormous morbidity and mortality. Diseases which afflict both western and developing countries are often seen in more florid forms in poorer countries. Innovative techniques continuously improve and update gastroenterological practice. However, advances in diagnosis and treatment which are commonplace in the West, have yet to reach many developing countries. Clinical guidelines, based on these advances and collated in resource-rich environments, lose their relevance outside these settings. In this two-part review, we first highlight the global burden of gastroenterological disease in three major areas： diarrhoeal diseases, hepatitis B, and Helicobacter pylori. Recent progress in their management is explored, with consideration of future solutions. The second part of the review focuses on the delivery of clinical services in developing countries. Inadequate numbers of healthcare workers hamper efforts to combat gastroenterological disease. Reasons for this shortage are examined, along with possibilities for increased specialist training. Endoscopy services, the mainstay of gastroenterology in the West, are in their infancy in many developing countries. The challenges faced by those se^ing up a service are illustrated by the example of a Nigerian endoscopy unit. Finally, we highlight the limited scope of many clinical guidelines produced in western countries. Guidelines which take account of resource limitations in the form of ＂cascades＂ are advocated in order to make these guidelines truly global. Recognition of the different working conditions facing practitioners worldwide is an important step towards narrowing the gap between gastroenterology in rich and poor countries.

关键词： Helicobacter pylori Developing countries Gastrointestinal diseases Health care delivery Practice guidelines

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中美烧结材料市场的机遇与合作

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粉末冶金技术 2004年第5期22卷 308-309页

作者： Sharon l.elder 吴运新美国宾州州立大学新型烧结制品中心清华大学机械系北京100084

中国的烧结材料(S/m)行业如何去适应国际市场?经济与全球安全方面的需要正在考验我们的科学、工程和技术能力,国际化网络也因此越来越重要.面对新的挑战,烧结材料行业必须做好提供新型产品的准备,而优胜者将是那些适应不断变化的市场和... 详细信息

中国的烧结材料(S/m)行业如何去适应国际市场?经济与全球安全方面的需要正在考验我们的科学、工程和技术能力,国际化网络也因此越来越重要.面对新的挑战,烧结材料行业必须做好提供新型产品的准备,而优胜者将是那些适应不断变化的市场和技术进步,并且能够同其它加工技术进行有效竞争的企业.

关键词：企业市场行业中国合作有效竞争机遇准备适应变化

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