简介:摘要:基于新课标的课程理念,基于现代信息技术的初中生物学教学中,教师应用AR技术实施教学,能够发挥它的重要价值:直观生动展现知识,化解疑难实验问题,增强学生学习兴趣,提高课程教学效率。通过运用案例分析法、经验总结法,提出初中生物学教学中AR技术的应用策略:基于课程准备资源,创设情境导入新课;根据生物实验主题,解决实验操作难题;直接搭建生物模型,突破客观条件限制;引领学生生物调查,发挥新型技术作用;结合学生认知情况,辅助学生课后学习。教师通过深入研究初中生物学教学内容,明确以往教学中的难点,通过应用AR技术教学,能有效提高教学效果,达成课程教学目标。
简介:Byusingthe40Ar-39ArchronologicalmethodtodateK-feldsparfromK-feldspargraniteintheQiaohuotecopperdistrict,theauthorsobtainedaplateauageof274.78±0.44Maandanisochronageof272.7±3.0Ma.BecausethereisnotectonicdeformationoverprintedorhydrothermalalterationintheK-feldspargraniteintrusionafteritsemplacement,the40Ar-39AragerepresentsthecrystallizationageofK-feldsparinK-feldspargranite,i.e.thelatecrystallizationageoftheK-feldspargraniteintrusion,whichindicatesthattheK-feldspargraniteformedintheintraplateextensionalstageduringtheEarlyPermian.Moreover,basedonthespatialrelationshipbetweentheK-feldspargraniteintrusionandcopperorebodies,variationsofcopperoregrade,REEcharacteristicsofK-feldspargraniteandcopperores,andHandOisotopiccompositionsoffluidinclusionsincopperores,themetallogenesisoftheQiaohuotecopperdepositisdirectlyrelatedtointrusiveactivitiesoftheK-feldspargranite,andthusthecrystallizationageofK-feldsparinthegraniteapproximatelyapproachesthemetallogenicepochoftheQiaohuotecopperdeposit.
简介:摘要: 当前, VR 技术以蓬勃的生命力延伸到教育领域。笔者基于中职教学、师资和学生现状,认为将 VR 应用到中职英语教学,融合先进教学理念和策略,能够解决教学痛点,改善学习体验,革新教学方式,增进教育公平。
简介:Surfacemodificationofpolypropylenemembranebyargon(Ar)plasma-inducedgraftpolymerizationwithhydrophilicn,onomer[acrylicacid(AA)inthiswork]wasinvestigated.ItwasfoundthatboththedistanceofthemembranefromtheArplasmacenterandtheplasmapowerhadastronginfluenceonthesurfacemodification,hydrophilicityandgraftyield(GY)ofthetreatedmembrane.Resultssuggestthatremoteplasmatreatmentwithapropersampleposition,plasmapowerandgraftpolymerizationleadstoamembranesurfacewithnotonlylessdamage,bntalsomorepermanenthydrophilicity,thandirectplasmatreatmentdoes.Byanalyzingthemorphologyandthechemicalcompositionofthemembranesurfacebyscanningelectronmicroscopy(SEM)andX-rayphotoelectronspectroscopy(XPS),aswellasFouriertransforminfraredattenuatedtotalreflectionspectroscopy(FTIR-ATR)respectively,apossiblemechanismwastentativelyrevealed.
简介:摘要;目的通过动物实验从基因水平上研究中药复方对脾虚型AR的治疗机制。方法将健康SD大鼠随机分为7组。建立变应性鼻炎模型,用药七天后,检测大鼠IL-2mRNA,β1-DefensinmRNA等变化。结果用药七天后各治疗组的鼻部评分与模型组相比有差异(p<0.05)。IL-2mRNA,β1-DefensinmRNA表达脾虚AR组和AR组与空白组相比有显著性差异(p<0.01)。脾虚AR组与AR组相比有统计学差异(p<0.05);各治疗组与AR组相比有显著性差异(p<0.01)。结论中药能明显改善鼻粘膜病理反应;并通过多层次,多角度对细胞因子mRNA表达的调节,能起到很好的防治作用。