简介：AccordingtostatisticsfromMinistryofEducation,fromtheReformandOpeninguptotheendo2013,thenumberofvariouskindsooverseasstudentshadreached3.0586million.Thenumberin2013was413900.

简介：在ZnO的性质上评估ZnO缓冲区层和艾尔比例的影响：艾尔(偶氮)/ZnO双性人层电影，一系列AZO/ZnO电影被电子横梁蒸发在石英底层上扔。X光检查衍射测量证明这些电影的水晶质量随电影厚度的增加被改进。这些电影的电的性质被调查。搬运人集中和霍尔活动性两个都随缓冲区层厚度的增加增加。然而，抵抗力到达在大约50nm厚的缓冲区层最低。最低抵抗力和最大的霍尔活动性两个都在1wt%艾尔集中被获得。但是所有这些电影的光发射度不管有比在可见区域的5wt%低的艾尔集中的缓冲区层厚度比80%大。

简介：AbstractPurpose:Alcohol has been associated with 10%—35% trauma admissions and 40% trauma-related deaths globally. In response to the COVID-19 pandemic, the United Kingdom entered a state of "lockdown" on March 23, 2020. Restrictions were most significantly eased on June 1, 2020, when shops and schools re-opened. The purpose of this study was to quantify the effect of lockdown on alcohol-related trauma admissions.Methods:All adult patients admitted as "trauma calls" to a London major trauma centre during April 2018 and April 2019 (pre-lockdown, n = 316), and 1st April—31st May 2020 (lockdown, n = 191) had electronic patient records analysed retrospectively. Patients’ blood alcohol level and records of intoxication were used to identify alcohol-related trauma. Trauma admissions from pre-lockdown and lockdown cohorts were compared using multiple regression analyses.Results:Alcohol-related trauma was present in a significantly higher proportion of adult trauma calls during lockdown (lockdown 60/191 (31.4%), vs. pre-lockdown 62/316 (19.6%); (odds ratio (OR): 0.83, 95% CI: 0.38—1.28, p < 0.001). Lockdown was also associated with increased weekend admissions of trauma (lockdown 125/191 weekend (65.5%) vs. pre-lockdown 179/316 (56.7%); OR: 0.40, 95% CI: 0.79 to -0.02, p = 0.041). No significant difference existed in the age, gender, or mechanism between pre-lockdown and lockdown cohorts (p > 0.05).Conclusions:The United Kingdom lockdown was independently associated with an increased proportion of alcohol-related trauma. Trauma admissions were increased during the weekend when staffing levels are reduced. With the possibility of further global "waves" of COVID-19, the long-term repercussions of dangerous alcohol-related behaviour to public health must be addressed.

简介：Toenlargethemiddle-incomegroupandconstructthe'olivary'incomedistributionbecomesoneoftheimportantissuesoftheeconomicdevelopmentandincomedistributionreforminChina.Theincomedistributionfunctionisestimatedwithkerneldensity,andtheincomedistributionM-curveisconstructedwithCHNSandCHIPdatatocalculatethemiddle-incomegroup.Furthermore,acomparativeanalysisiscarriedoutforthechangingtrendofthesizeandproportionofmiddle-incomegroup.Researchconclusion:itisdiscoveredaccordingtotheincomedistributionM-curvethatthekeytotheenlargementofurbanmiddle-incomegroupliesinthelowermiddle-incomegroup,whilethekeytotheenlargementofruralmiddle-incomegroupliesintheimprovementoftheuppermiddle-incomegroup.Therangeofmiddle-incomegroupisexpanding,butduetothesmallscale,lowproportion,andpoorstability,ithasnotdevelopedthe'olivary'incomedistributionstructureyet,andincomeinequalitytendstobedeepened.

简介：Apredator-preysystemwithaconstantproportionofpreyrefugeandstage-structureforpreyspeciesisproposedandstudiedinthispaper.Asetofconditionsforthepermanenceofthesystemisobtained.Thelocalstabilityofthesystemisdiscussedbythesignofeigenvalues.Furthermore,byusingtheiterativemethod,somesuitablesufficientconditionsfortheglobalattractivityoftheinteriorequilibriumisobtained.Ourstudyshowsthattheconstantproportionofpreyrefugecouldleadtomorecomplicatedynamicbehaviors.Numericalsimulationsarealsopresentedtoillustratethefeasibilityofthemainresults.