Teachers learning goals and their knowledge of students play important rolesWord下载.docx
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139
Propertiesofarchitecturalmortarpreparedwithrecycledglasswithdifferentparticlesizes
OriginalResearchArticle
Materials&
Design,Volume32,Issue5,May2011,Pages2675-2684
Tung-ChaiLing,Chi-SunPoon
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Abstract
Therecyclingofglasswasteasasourceofaggregatefortheproductionofconcreteproductshasattractedincreasinginterestfromtheconstructionindustry.However,theuseofrecycledglassinarchitecturalmortarisstilllimited.Thisstudyattemptstodevelopaself-compactingbasedarchitecturalmortarusingwhitecementand100%recycledblueglassaskeyingredients.Toimprovetheaestheticqualities,acertainminimumquantityofglassculletsoflargerparticlesizemustbepresent.Theinfluenceofparticlesizeoftherecycledglassontheengineeringpropertiesoffreshandhardenedarchitecturalmortarisinvestigated.Theexperimentalresultsdemonstratethatitisfeasibletoutilize100%recycledglassastheaggregatefortheproductionofself-compactingbasedarchitecturalmortar.Theseproductshaveanaveragecompressivestrengthof40
MPaandflexuralstrengthof6
MPaat28
dayswhichareappropriateforsomearchitecturalandbuildingapplications.Also,theoverallperformancesofallthearchitecturalmortarspreparedwithdifferentparticlesizesofglassaggregatesarecomparabletothoseofcontrolmortarmixpreparedwithriversand.
ArticleOutline
1.Introduction
2.Experimentalprogramme
2.1.Materials
2.1.1.Cement
2.1.2.Supplementarycementitiousmaterial
2.1.3.Fineaggregates
2.1.4.Admixture
2.2.Mixproportions
2.3.Samplepreparation
2.4.Testingdetails
2.4.1.Freshproperties
2.4.2.Permeablevoidsandwaterabsorption
2.4.3.Flexuralstrength
2.4.4.Equivalentcompressivestrength
2.4.5.Dryingshrinkage
2.4.6.Expansionduetoalkali-silicareaction
2.4.7.Abrasionresistance
2.4.8.Chemicalresistance
3.Resultsanddiscussion
3.1.Freshproperties
3.2.Surfaceappearance
3.3.Waterabsorptionandpermeablevoids
3.4.Flexuralstrength
3.5.Equivalentcompressivestrength
3.6.Dryingshrinkage
3.7.Alkali-silicareaction
3.8.Abrasionresistance
3.9.Chemicalresistance
4.Conclusion
Acknowledgements
References
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►Provideaneffectivesolutionofrecyclingwasteofglass.►Itisfeasibletoinclude100%recycledglassinself-compactingarchitecturalmortars.►Theseproductshaveaveragecompressiveandflexuralstrengthsof40
MPaand6
days.►Largesizeofglasscullteshasenhancedtheaestheticvalueofarchitecturalmortars.►Propertiesofarchitecturalmortarsmadewithdifferentparticlesizesofglasswerestudied.
140
Animprovednoise-robustvoiceactivitydetectorbasedonhiddensemi-Markovmodels
PatternRecognitionLetters,Volume32,Issue7,1May2011,Pages1044-1053
YuanLiang,XianglongLiu,YihuaLou,BaosongShan
Toimprovetheperformanceofvoiceactivitydetector(VAD)innoisyenvironments,thispaperconcentratesonthreecriticalaspectsrelatedtonoiserobustnessincludingspeechfeatures,featuredistributionsandtemporaldependence.BasedonthestatisticonTIMITandNOIZEUS,Mel-frequencycepstrumcoefficients(MFCCs)areselectedasspeechfeatures,GaussianMixturedistributions(GMD)areappliedtoassociatetheobservationsinMFCCdomainwithbothspeechandnon-speechstates,andWeibullandGammadistributionsareusedtoexplicitlymodelnoiseandspeechdurations,respectively.TointegratetheseaspectsintoVAD,thehiddensemi-Markovmodel(HSMM)asageneralizedhiddenMarkovmodel(HMM)isintroducedfirst.ThentheVADdecisionismadeaccordingtothelikelihoodratiotest(LRT)incorporatingstatepriorknowledgeandmodifiedforwardvariablesofHSMM.Wedesignarecursivewaytoefficientlycalculatemodifiedforwardvariables.Finallyaseriesofexperimentsdemonstrate:
(1)thepositiveeffectofdifferentrobustness-relatedschemesadoptedintheproposedVAD;
(2)betterperformanceagainstthestandardITU-TG.729B,AdaptiveMultiRateVADphase2(AMR2),AdvancedFront-end(AFE),HMM-basedVADandVADusingLaplacian–Gau
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