简介：The2-Dheteronuclearcoordinationpolymer{[Ag4Fe2(SCN)12(H2O)2][(inaH)2(H2O)2]}n(1)(inaHistheabbreviationofprotonatedisonicotinicacid)withchemicalformulaC24H20Ag4Fe2N14O8S12hasbeensynthesizedandcharacterizedbysinglecrystalX-raydiffraction,elementalanalysisandIRspectroscopy.TheAgES2ringsconnecttwokindsofoctahedralgeometriesofFe(Ⅲ)ions,[Fe(NCS)6]^3-and[Fe(H2O)E(NCS)4]^-unitswithbridgingthiocyanateionsleadingto2-D[Ag4Fe2(SCN)12(H2O)2]^2-anionframework.Fourkindsofringsincludingtheunprecedentedthirty-twomemberedAg4Fe4(SCN)8ringssharecomersoredgesinthe2-Danionlayerstructure.AllthiocyanatescoordinatetothemetalionsaccordingtotheHSABprinciplewithNatomsbindingtotheFe(Ⅲ)ionsandwithSatomsbindingtoAg(I)ions.Pronoatedinacationsstabilizethelayerstructureascounterionsandhydrogenbondswereformedwithinthepronoatedinacationsdimerandbetweenthedimersandthelatticewaters.Crystaldata:Mr=1560.44,triclinic,P-↑1,a=0.76082(1)nm,b=0.9234nm,c=1.85611(4)nm,α=103.0170(10)°,β=93.7780(10)°,γ=97.4080(10)°,V=1.25385(3)nm^3,Z=1,μ(MoKα)=2.650mm^-1,Dc=2.067g·cm^-3,F(000)=758,R1=0.0412,wR2=0.1003.
简介：Thesolidaddofthefirstprotonatedzincoborophosphate,(H3O)Zn(H2O)2BP2O8·H2O(1),wassoventothermallysyn-thesizedbythereactionofZn(NO3)2·6H2OandH3BO3withH3PO4inamixedsolvent,andstructurallycharacterizedbysingle-ystalX-raydiffractionanalysis.ItcrystallizesinthehexagonalP6122,a=0.9604(4)nm,c=1.5297(6)nm,V=1.2218(8)nm^3,Dc=2.921g/cm^3,Z=6,F(000)=1080,μ=3.495mm^-1.Thestmchwefeaturesthatthetetrahedra-te-trahedrahdlcesinterconnectedbyoctahedraandstronghydro-gembondinteractionsformathree-dimensionalframework.Theprotonatedwatermoleculesarelocatedatuniquepositions.othercharacterizationsbyIRandthermalanalysisarealsode-scribed.
简介：摘要：PDEODE教学策略源于演示实验教学策略POE，依托实验与认知冲突，在合作学习与交流中，达到概念转变。在分析PDEODE策略的基础上，构建基于PDEODE策略的化学课堂概念转变教学模式：“提出问题一分析问题一设计方案一收集信息一分析信息一得出结论。”并以探究“二氧化碳的漂白性”为例，在中学化学课堂实施该策略。
简介：摘要：学生的思想、素质和能力都是通过学习科学知识、掌握技能和方法而得到提高的。化学学科的核心素养主要有宏观识别和微观分析、转变观念和平衡思维、证明和模型认知、科学探索和创造、科学精神和社会责任等方面。化学核心能力对学生的终生学习与发展有很大的推动作用。新的课程标准中，强调要注重“素养为本”的教育，同时注重创造真正问题情境的创设。所以本文以二氧化硫的性质为实例，通过对现实环境的分析，提出了一种真实问题情境为基础的化学课堂教学，从多个视角进行问题的设计，并通过对问题进行深入研究，通过创造性的实验，使学生在深层次的参与中得到更深的学习体会，从而提升自身的核心素养能力。
简介：AsimplespectrophotometricassayofH2O2andglucoseusingAgnanoparticleshasbeencarriedout.RelyingonthesynergisticeffectofH2O2reductionandultraviolet(UV)irradiation,Agnanoparticleswithenhancedabsorptionsignalsweresynthesized.H2O2servedasareducingagentintheAgnanoparticlesformationinwhichAg+wasreducedtoAg0byO2àgeneratedviathedecompositionofH2O2inalkalinemedia.Ontheotherhand,photoreductionofAg+toAg0underUVirradiationsalsocontributedtothenanoparticlesformation.ThesynthesizednanoparticleswerecharacterizedbyTEM,XPS,andXRD.TheproposedmethodcoulddetermineH2O2withconcentrationsrangingfrom5.010à7to6.010à5mol/L.Thedetectionlimitwasestimatedtobe2.010à7mol/L.SincetheconversionofglucosetogluconicacidcatalyzedbyglucoseoxidasewascompaniedwiththeformationofH2O2,thesensingprotocolhasbeensuccessfullyutilizedforthedeterminationofglucoseinhumanbloodsamples.Theresultswereingoodagreementwiththosedeterminedbyalocalhospital.Thiscolorimetricsensorthusholdsgreatpromisesinclinicalapplications.
简介：采用Fe^2＋-H2O2-二氧化硫脲氧化还原引发体系制备了桉木浆-GMA（甲基丙烯酸缩水甘油酯）接枝共聚物，研究了反应温度、时间、H2O2用量、二氧化硫脲用量、单体浓度和液比对接枝纤维的环氧基含量及环氧基水解率的影响。结果表明，适当提高接枝温度、缩短反应时间、增加单体浓度、减小液比、控制合适的H2O2和二氧化硫脲用量都能提高接枝纤维的环氧基含量，并且环氧基水解率都可控制在10％～15％。通过红外光谱发现，GMA已成功接枝到桉木浆上。
简介：摘要：寻找真实恰当的素材背景，设置具有引导的问题情境，是实现探究式化学教学的一种有效手段。以“硫和二氧化硫”的教学设计为例，阐述了借助整合性的素材背景，设置问题驱动学生探究。关于创设真实问题情境式的探究教学进行总结反思。
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： 摘要：脱硫吸收塔控制电石渣浆液的进入量，来调整塔内循环浆液的PH值，循环喷淋的浆液与烟气反应（二氧化硫与石灰石反应生成无害石膏）降低烟气中二氧化硫到合格排放标准。脱硫工艺自动化控制中，石灰石浆液流量、PH值、二氧化硫是最重要的工艺控制指标。实现自动化控制，可提高工艺控制品质，减轻人员频繁操作疲劳度，避免因人员操作失误而导致的环保超标事故。
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![Synthesis and Crystal Structure of a Two-dimensional Silver（Ⅰ）-Iron（Ⅲ） Heteronuclear Coordination Polymer： {[Ag4<b style='color:red'>Fe</b><b style='color:red'>2</b>（SCN）12（<b style='color:red'>H</b><b style='color:red'>2</b><b style='color:red'>O</b>）<b style='color:red'>2</b>] [（inaH）<b style='color:red'>2</b>（<b style='color:red'>H</b><b style='color:red'>2</b><b style='color:red'>O</b>）<b style='color:red'>2</b>]}n](/image/thesis0 "Synthesis and Crystal Structure of a Two-dimensional Silver（Ⅰ）-Iron（Ⅲ） Heteronuclear Coordination Polymer： {[Ag4<b style='color:red'>Fe</b><b style='color:red'>2</b>（SCN）12（<b style='color:red'>H</b><b style='color:red'>2</b><b style='color:red'>O</b>）<b style='color:red'>2</b>] [（inaH）<b style='color:red'>2</b>（<b style='color:red'>H</b><b style='color:red'>2</b><b style='color:red'>O</b>）<b style='color:red'>2</b>]}n")
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![Syntheses, Crystal Structures and Characterization of Two Zeotype Crystals of K4[Cr30（<b style='color:red'>H</b><b style='color:red'>2</b><b style='color:red'>O</b>） 3（OOCH） 6] <b style='color:red'>2</b>[ P<b style='color:red'>2</b>W18<b style='color:red'>O</b>62]· 9.5<b style='color:red'>H</b><b style='color:red'>2</b> <b style='color:red'>O</b> and K4[ Cr3<b style='color:red'>O</b>（ <b style='color:red'>H</b><b style='color:red'>2</b><b style='color:red'>O</b>）3（ OOCH）6 ]<b style='color:red'>2</b>[ <b style='color:red'>H</b>3 P<b style='color:red'>2</b> W17Co（<b style='color:red'>H</b><b style='color:red'>2</b><b style='color:red'>O</b>） <b style='color:red'>O</b>61]· 20<b style='color:red'>H</b><b style='color:red'>2</b><b style='color:red'>O</b>](/image/thesis16 "Syntheses, Crystal Structures and Characterization of Two Zeotype Crystals of K4[Cr30（<b style='color:red'>H</b><b style='color:red'>2</b><b style='color:red'>O</b>） 3（OOCH） 6] <b style='color:red'>2</b>[ P<b style='color:red'>2</b>W18<b style='color:red'>O</b>62]· 9.5<b style='color:red'>H</b><b style='color:red'>2</b> <b style='color:red'>O</b> and K4[ Cr3<b style='color:red'>O</b>（ <b style='color:red'>H</b><b style='color:red'>2</b><b style='color:red'>O</b>）3（ OOCH）6 ]<b style='color:red'>2</b>[ <b style='color:red'>H</b>3 P<b style='color:red'>2</b> W17Co（<b style='color:red'>H</b><b style='color:red'>2</b><b style='color:red'>O</b>） <b style='color:red'>O</b>61]· 20<b style='color:red'>H</b><b style='color:red'>2</b><b style='color:red'>O</b>")
