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Role of MgF2 addition on high energy ball milled kalsilite:Implementation as dental porcelain with low temperature frit

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Journal of Advanced Ceramics 2014年第4期3卷 332-338页

作者： Pattem Hemanth KUMAR abhinav srivastava Vijay KUMAR Nandini JAISWAL Pradeep KUMAR Vinay Kumar SINGH Department of Ceramic Engineering Indian Institute of Technology(BHU)VaranasiIndia Department of Chemical Engineering Indian Institute of Technology(BHU)VaranasiIndia

Porcelain fused to metal(PFM)has received great attention over the last few years due to its importance in the ***(K_(2)O·Al_(2)O_(3)·SiO_(2))is a high thermal expansion porcelain,suitable for bonding to ***,kalsilite is a metastable phase which gets converted into crystalline leucite upon *** the current work feasibility of developing stable kalsilite phase,dispersion of MgF2 in it as an additive and using mechanochemical synthesis are *** fine dental material has been formulated by mixing prepared kalsilite with low temperature frit(LTF)in different *** crystalline phases evolved in fired powders are characterized by powder X-ray diffraction(XRD)*** with different ratio of LTF has been cold pressed and heat treated to examine its coefficient of thermal expansion(CTE),flexural strength,apparent porosity(AP),bulk density(BD)and *** indicate that MgF_(2) addition and high milling duration help in kalsilite *** also plays an important role in this stabilization,and at 1100℃single phase kalsilite formation is *** outcomes demonstrate that it is easily possible to synthesize a stable single phase kalsilite with desirable properties.

关键词： kalsilite porcelain fused to metal(PFM) dental ceramic mechanochemical synthesis thermal expansion X-ray diffraction(XRD)

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Spatio-temporal assessment of soil salinization utilizing remote sensing derivatives,and prediction modeling:Implications for sustainable development

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Geoscience Frontiers 2024年第6期15卷 22-36页

作者： Prashant Kumar Prasoon Tiwari Arkoprovo Biswas Prashant Kumar srivastava Department of Geology Centre of Advanced StudyInstitute of ScienceBanaras Hindu UniversityVaranasi 221005U.P.India Institute of Environment and Sustainable Development Banaras Hindu UniversityVaranasi 221005U.P.India

This study aims to investigate the combined use of multi-sensor datasets(Landsat 4–5&8 OLI satellite imagery,spatial resolution=30 m)coupled with field studies to evaluate spatio-temporal dynamics of soil salinization along the coastal belt in West Bengal,*** study assesses soil salinization by mapping the salinity and electrical conductivity of saturation extract(ECe)and utilizing spectral signatures for estimating soil *** SI change(%)was analyzed(2021–1995),categorizing increases in salinity levels into 5%,10%,and 50%changes possibly due to salt encrustation on the soil *** land use land cover(LULC)change map(2021–1995)demonstrates that the study area is continuously evolving in terms of ***,in the study area,soil salinity ranges from 0.03 ppt to 3.87 ppt,and ECe varies from 0.35 dSm^(-1)to 52.85 dSm^(-1).Additionally,vulnerable saline soil locations were further *** of soil salinity based on ECe reveals that 26%of samples fall into the nonsaline category,while the rest belong to the saline *** Spectral signatures of the soil samples(n=19)acquired from FieldSpec hand spectrometer show significant absorption features around 1400,1900,and 2250 nm and indicate salt *** results of reflectance spectroscopy were crossvalidated using X-ray fluorescence and scanning electron *** study also employed partial least square regression(PLSR)approach to predict ECe(r^(2)=0.79,RMSE=3.29)and salinity parameters(r^(2)=0.75,RMSE=0.51),suggesting PLSR applicability in monitoring salt-affected soils *** study’s conclusion emphasizes that remote sensing data and multivariate analysis can be crucial tools for mapping spatial variations and predicting soil *** has also been concluded that saline groundwater used for irrigation and aqua-cultural activities exacerbates soil *** study will help policymakers/farmers identify the salt degradation problem more effectivel

关键词： Hyperspectral remote sensing Scanning electron microscopy X-ray fluorescence Partial least square regression Soil salinity Salinity index

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