简介:G20是当今全球经济治理的主要平台。G20为应对全球金融危机、促进世界经济复苏、推动国际金融及国际货币体系改革发挥了重要作用。从早期的积极参与者,到2008年后的核心参与者,再到当前的核心领导者,中国不仅在应对危机、推进国际金融和国际货币体系改革等方面发挥了重要作用,还以自身经济的持续高速增长为G20及世界作出重要贡献。基于当前形势及各方期待,中国把杭州峰会主题确定为"构建创新、活力、联动、包容的世界经济",已开展一系列工作凝聚共识。对中国和G20而言,本次峰会有望成为中国参与引领全球经济治理的新起点;G20也将开启由危机应对向长期化、机制化、功能化方向转化的新征程。
简介:1IntroductionLetA∈Cn×n,B∈Cn×n.WesayBisasquarerootofAifA=B×Bi.e.A=B2.Itiswell-knownthatanysymmetricpositivedefinitematrixexistsoneandonlyonesquarerootwhichisasymmetricpositivedefinitematrix,too(e.g.see[5]).Higham[4]studiedcarefullytherelationofarealnonsingularmatrixbetweenitsrealsquarerootsanditseigenvalues.AlefeldandSchneider[1]pointedoutthatforanynonsingularM-ma-trixthereisoneandonlyoneM-matrixasitssquareroot.Inthispaper,westudyona
简介:AbstractObjective:The aim of this work was to explore the feasibility of in vivo and non-invasive monitoring of deuterium/hydrogen (2H/1H) exchange at the metabolic level upon exposure to heavy water (2H2O).Methods:The healthy female mice were randomly assigned to two groups after day 0 when both mice received standard drinking water. The treated mouse was fed with 2H2O (80%, v/v) and the control mouse fed with standard drinking water (H2O) over next 13 days. Real-time mass spectrometric analysis of volatile metabolism emitted through breathing and the skin was performed on days 1, 2, 3, 10, 12, and 13. Animal experiment was approved by the Laboratory Animal Ethics Committee of Jinan University (approval No. 20161117163322) on October 29, 2021.Results:We observed a replacement of 1H by 2H in 52 mass spectral features (60 2H/1H isotopologue pairs) for the mouse fed with 2H2O, but not for the control mouse. These included pyruvic acid and lactic acid, lysine and methyl-lysine as well as short-chain fatty acids comprising acetic acid, propionic acid, butyric acid and valeric acid.Conclusion:Secondary electrospray ionization-high resolution mass spectrometry allows monitoring in vivo2H-incorporation of metabolites in a non-invasive and real-time setup and opens new opportunities to use 2H tracing to extend current metabolic studies, especially those with a focus on anaerobic glycolysis, lysine methylation and gut microbiome via monitoring of short-chain fatty acids.
简介:ThispaperstudiestheinfinitetimehorizonmixedH-two/H-infinitycontrolproblemfordescriptorsystemsusingNashgameapproach.Anecessary/sufficientconditionfortheexistenceofinfinitehorizonH-two/H-infinitycontrolispresentedintheformoftwocoupledalgebraicRiccatiequations,respectively.Finally,asuboptimalH-two/H-infinitycontrollerdesignisgivenbasedonaniterativelinearmatrixinequalityalgorithm.