Search results for "Homogeneous precipitation"

showing 4 items of 4 documents

Detection of homogeneous precipitation regions at seasonal and annual time scales, northwest Iran

2017

Abstract Detection of homogeneous climate areas is a challenging issue, which can be affected by different criteria. One of the most prominent factors is choosing the time scale, which can lead to different spatial and temporal patterns. Total precipitation is a key factor in climatological studies, and studying its distribution is of utmost importance. The combination of principal components analysis and cluster analysis is used for homogeneous precipitation areas' detection. Hence, the spatial pattern of total precipitation was investigated in northwestern Iran during the past two decades (1991–2010) on seasonal and annual time scales. The results of clustering on each time scale were val…

Atmospheric ScienceGlobal and Planetary Change010504 meteorology & atmospheric sciencesSettore GEO/04 - Geografia Fisica E Geomorfologia0208 environmental biotechnology02 engineering and technologyManagement Monitoring Policy and Law01 natural sciences020801 environmental engineeringHomogeneous precipitationClimatologyPrincipal component analysisPeriod (geology)Cluster (physics)Common spatial patternEnvironmental sciencePrecipitationScale (map)Cluster analysisSettore GEO/05 - Geologia Applicata0105 earth and related environmental sciencesWater Science and Technologycluster analysis GIS principal component analysis time scale total precipitation
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Magnetic Properties of Ni II Cr III Layered Double Hydroxide Materials

2008

This paper describes the isolation of four layered double hydroxide (LDH) compounds having the general formula[NiII3–xCrIIIx(OH)6](CO3)x/2·yH2O [x = 0.57 (1), 0.69 (2), 0.81 (3) and 0.93 (4)] by using homogeneous precipitation methods and varying the metal ratio in the synthetic solutions. All the reported compounds have carbonate anions in the interlamellar space. This fact forces the interlayer distances to remain unchanged in all the cases, thus providing an ideal system in which the changes observed in magnetic properties can be correlated with metal composition along the hydroxide layers.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)

Ideal systemChemistryInorganic chemistrychemistry.chemical_elementInorganic ChemistryMetalHomogeneous precipitationchemistry.chemical_compoundNickelChromiumvisual_artvisual_art.visual_art_mediumPhysical chemistryCarbonateHydroxideEuropean Journal of Inorganic Chemistry
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ChemInform Abstract: Magnetic Properties of NiIICrIIILayered Double Hydroxide Materials.

2009

This paper describes the isolation of four layered double hydroxide (LDH) compounds having the general formula[NiII3–xCrIIIx(OH)6](CO3)x/2·yH2O [x = 0.57 (1), 0.69 (2), 0.81 (3) and 0.93 (4)] by using homogeneous precipitation methods and varying the metal ratio in the synthetic solutions. All the reported compounds have carbonate anions in the interlamellar space. This fact forces the interlayer distances to remain unchanged in all the cases, thus providing an ideal system in which the changes observed in magnetic properties can be correlated with metal composition along the hydroxide layers.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)

Metalchemistry.chemical_compoundHomogeneous precipitationchemistryIdeal systemvisual_artvisual_art.visual_art_mediumHydroxidePhysical chemistryCarbonateGeneral MedicineChemInform
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Hexagonal nanosheets from the exfoliation of Ni2+-Fe3+ LDHs: a route towards layered multifunctional materials

2010

Here we report the synthesis of a crystalline micrometric-sized hexagonal-shaped Ni2+-Fe3+ LDH by following a modified homogeneous precipitation method. The exfoliation of the material in formamide leads to stable suspensions of hexagonal nanometric sheets, which have been extensively characterized. Our data confirm that the intrinsic properties of the bulk material are retained by these segregated nanosheets, thus opening the door for their use in the development of layered multifunctional materials.

inorganic chemicalsFormamidechemistry.chemical_compoundHomogeneous precipitationMaterials sciencegenetic structureschemistryHexagonal crystal systemMaterials ChemistryNanotechnologyGeneral ChemistryExfoliation jointJournal of Materials Chemistry
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