简介：ThesynthesisofcalciumformatebyCa(OH)2carbonylationwasstudiedinasemi-batchstirredtank.Thereactionmechanismwasanalyzedtheoreticallyandtherateofeachstepwascompared.Theinfluenceofreactionconditionsontheformationofcalciumformatewasinvestigated.Theresultsindicatethattherate-controllingstepisthereactionbetweendissolvedCOanddissolvedCa(OH)2,andthegaseousdiffusionresistancecanbeeliminatedwhenthestirringspeedreached1000r/min.Furthermore,thereactionkineticswasstudiedatastirringspeedof1000r/min,temperatureof423–453K,pressureof2.0–3.5MPaanddifferentinitialconcentrationsofCa(OH)2.AneffectivemethodwasproposedtomeasurethereactionrateofCO.Amathematicalmodelwasdevelopedusingthedual-filmtheory,andtheparameterswereobtainedusingregressionofexperimentaldata.Thereactionratescalculatedusingthekineticsmodelwerecomparedwithexperimentaldata.Theresultsshowthatthedeviationsarewithin±10%,provingthattheestablishedmodelisvalidandcanprovideabasisforindustrialamplification.

简介：Calciumisimportantforourhealth.Wemusthaveitinourdiettostaywell.Agoodplacetogetitisfromdairyproductslikemilk,cheeseandicecream.Onepoundofcheesehasfiftytimesthecalciumweshouldhaveeveryday.Otherfoodshaveless.Forexample,apoundofbeansalsohascalcium.Butithasonlythreetimestheamountweoughttohavedaily.

简介：与连续、慢的氧版本特征，过氧化钙(CaO_2)是在污染地下水的简历补习为氧气的微生物供应氧的新来源。批实验被进行评估在包含CaO_2的媒介与水，高酸碱值的规定，以及混合氧气的微生物的生长反应的氧版本率ofCaO_2。结果证明氧版本CaO_2comprises处理三个阶段。当CaO_2的增加的重量增加了，在第一个阶段，严厉地增加的水的溶解的氧层次，和一般水准，氧版本率增加了。然而，率几乎在后者阶段保持不变并且是约0.48和0.084mgO_2?h~(-1),分别地。作为媒介，钾dihydrogen磷酸盐(KH_2PO_4)和硫酸铵的必要部件((NH_4)_2SO_4)能在某个比率调整CaO_2from12.1引起到6.5的范围的酸碱值-8.5，它对微生物引起的生长有用。另外，在包含CaO_2的媒介观察的diauxicgrowth曲线建议混合氧气的微生物的生长能被CaO_2的增加刺激。

简介：Microbe-inducedcalciteprecipitationisasustainableimprovementtechniqueforsandysoil,whichcanalterthepropertiesofsandviamicrobialactivity.Inthisstudy,weinvestigatedtheloose-sand-consolidationeffectbycontrollingtheinjectionvelocity,bacterialandcementingsolutionconcentrations,andholdtimes.Theresultsdemonstratethat,asthecyclicbatchincreases,theutilizationrateofthebacterialfluidincreasesandboththeopticaldensity(OD600)ofthebacteriaandureaseactivitydecrease.Moreover,itwasdeterminedthata3-hholdtimefora0.5mol/Lcementingsolutionwithacementingfluidvelocityof2mL/minhasthegreatestbondingeffect.Thefinalstrengthoftheloosesandwithanincreaseincalciumcarbonatecontentwasfurtherdiscussed.

简介：Inthisstudy,weinvestigatedtheeffectsof6-benzylaminopurine(6-BA)–calciumchloride(CaCl2)–salicylicacid(SA)treatmentontheyellowingandreactiveoxygenmetabolismofharvestedbroccoliheads.Wedippedfreshbroccoliheadsinacompoundsolution(0.6mmol/L6-BA+40mmol/LCaCl2+3mmol/LSA)for5minandthenstoredthemat23°Cfor4days.Theresultsshowedthatthe6-BA–CaCl2–SApostharvesttreatmenteffectivelyretardedtheincreaseincolorvalues(e.g.,variationsfromblacktowhite,fromgreentored,andfrombluetoyellow)andthedeclineinchlorophyllcontentofthebroccoliheads.Comparedwiththecontrolbroccoli,therateofsuperoxideanionradical(O2·?)productionandthehydrogenperoxide(H2O2)contentwereloweredbythetreatment.Wealsofoundsignificantdifferencesintheactivitiesofsuperoxidedismutase(SOD),catalase(CAT)andperoxidase(POD)inthetreatedbroccoli.Basedontheseresults,weconsider6-BA–CaCl2–SAtoinhibittheaccumulationofreactiveoxygen,delaythedegradationofchlorophyll,andprolongtheshelflifeofbroccoliheadsat23°C.

简介：Thepreparationofcalciumphosphate(CP)coatingonaluminaceramicsusingelectricpulsestimulatingmethodhasbeeninvestigated.Thecup-shapedaluminaceramicsweresoakedinasimulatedbodyfluid(SBF),andasquarepulsepotentialwithfrequencyof1Hzandvoltageof110Vwasappliedbetweentheinnerandoutersurfacesofthealuminacup.SurfacemorphologyofCPcoatingsduringdifferentdepositionperiodswasobservedbyaPhilipsXL-30scanningelectronmicroscope(SEM).CompositionalanalysiswasexaminedbyEDAX.ThemechanismofnucleationandgrowthofCPcoatingwasdiscussed.SEMresultindicatesthatthecoatingcomprisesofalargenumberoftinyneedle-likegrainsandhasaporousmicrostructure.ThereisastrongbondbetweenthedepositedlayerandAl2O3substrate,whichmaybeduetothegentlegrowthofthebiomimeticmethod.TheEDAXanalysisindicatesthatmaincompositionofthecoatingiscalciumandphosphor.TheformationofCPcoatingmaybecontributedtothestimulationofelectricpulseandthehighionsconcentrationwhichis1.5timesoftheconcentrationofSBFsolution(1.5SBFsolution).SuchsurfacefunctionalizationmethodbyelectricpulsepotentialcanbeusedtoprepareCPcoatingonvariouselectric-insulatingbioinertmaterialsforimprovingtheirbioactivecharacter.