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EPSRC Novel Technique For Fabrication Of Large Core High Rare Earth Concentration Photodarkening Resistant Fibres For High Power Fibre Laser Applications
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Equivalent molar concentration per liter About Calcite Calcite weighs gram per cubic centimeter or 2 711 kilogram per cubic meter density of calcite is equal to 2 711 kg/m³ at °C °F or at standard atmospheric pressure
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But at room temperature a thin film of calcite was deposited Moreover stable amorphous calcium carbonate was precipitated in presence of magnesium at low temperature The observed results show that low temperature and presence of additives influence the nucleation polymorph selectivity and morphology of the
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The mean values of TDS concentrations of LPW and BPW were mg/L and mg/L and the mean values of TH contents were mg/L and mg/L respectively which were mainly divided into hard fresh water The Piper diagram illustrated that the hydrochemical type of groundwater in the NCA was mainly the HCO 3 ·Ca type
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Calcite is a rock forming mineral with a chemical formula of CaCO3 It is extremely common and found throughout the world in sedimentary metamorphic and igneous rocks All natural waters contain dissolved calcium and carbon dioxide and their concentration is especially high in seawater Many marine animals including corals snails clams
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discharge from adjacent parts of the film On the basis of studies of calcite deposits precipitated in the lee of bed rock obstacles from film waters undergoing localized re freezing Hallet 1976 1979 argued that the water film primarily transported meltwater produced during the regelation process associated with glacier sliding He did
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A 347 Generalized far infrared magneto optic ellipsometry for semiconductor layer structures determination of free carrier effective mass mobility and concentration parameters in n type GaAs Mathias Schubert and Tino Hofmann Institut für Experimentelle Physik II Fakultät für Physik und Geowissenschaften Universität Leipzig Linnéstrasse 5 04103 Leipzig Germany and Department of
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Imagine a bowl of water Add some naturally occurring weak carbonic acid H2CO3 to the water Then place a piece calcite CaCO3 in the water The carbonic acid reacts with and dissolves the calcite to create two products calcium ions Ca 2 and bicarbonate ions HCO 3 both of which remain dissolved in the water
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The Role of Different Local Centres in the Determination of the Concentration Dependence of the Intrinsic Emission Intensity in n Type GaAs was published in Volume 45 Number 2 February 16 on page 687
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Special films have been prepared with the specific purpose of photographing through water Specht Needler and Fritz 1973 suggest that a film with two layers having peak sensitivities of about 480 and 550 nm will provide maximum penetration of water with various amounts of organic matter present and will allow some estimate of such material
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Nemati and Voordouw [] used urease enzyme and it was observed that concentration of urease enzyme from to g/l urea and calcium chloride concentration of M shows optimum production of calcium the practical condition it is very difficult to maintain the urease production ability of the bacteria in the soil and it is also a difficult task to retain all the bacteria in
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Mar 20 2022Films prepared at [Mg 2 ] = 4 × 10 −3 m and [PAA] = 4 µg mL −1 transformed to pure Mg calcite at 130 °C while those prepared at [Mg 2 ] = 2 × 10 −3 m and [PAA] = 2 µg mL −1 comprised aragonite with ≈20 vol% calcite as estimated from bright field TEM and SAED Figure 5E H The aragonite domains in the latter sample were always larger 10 20 µm than the calcite domains 2
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The National Academies of Sciences Engineering and Medicine May 2024 Apr 20213 years Washington Metro Area Worked on projects aimed at developing an efficient method to degrade
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Chemical speciation calculations using Pitzer equations are used to assess the potential errors associated with the calcite dissolution kinetics reported by Truesdale 2024 While these errors are shown to be small agreement between the measured saturation concentration of calcium and the thermodynamic solubility product of calcite is less good Truesdale has derived an exponential equation
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Jan 1 2022The calcite thin film formation from Ca OH 2 in ambient air can be understood by the following reaction 1 Ca NO3 2·4H2O 2NaOH → Ca OH 2 2NaNO3 4H2O 2 Characterization used Several characterization techniques were used to study the synthesized thin films on glass substrate
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adsorption of asphaltenes on calcite packs in the presence of brine films In this work we investigate the effect of brine chemistry ion concentration and valency on the dynamic adsorption of asphaltene in toluene solutions on pure quartz and calcite miner als A series of flow experiments were conducted on mineral packs
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1 When calcium carbonate was formed in the laboratory from the calcium bicarbonate solution through which carbon dioxide gas had not been bubbled during the process of the calcium carbonate formation a Only calcite was formed at a temperature below 25°C aragonite was formed above 25°C and vaterite was formed above 40°C
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Calcite Production The major steps for Calcite production are as mentioned below Step 1 Crush the incoming minerals and transfer them to ball mills to convert them to powder form Step 2 Sieve the powder form and separate it into the desired Step 3 Split the powder in 3 micron 5 micron 10 micron bags as The important fact is that with 100 tonnes of mine tons
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Scale bar is 1 cm b Ca concentration of subglacial precipitate sample MA113 High values represent calcite precipitation low values represent opal precipitation U series dates include 2σ uncertainties bars c δ 18 O measured in West Antarctic Divide Ice Core WDC 107 Gray dashed line delineates threshold value for magnitude of ice
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At a given calcium concentration the precipitation rate increased with increasing supersaturation This effect was more pronounced at higher supersaturations Measurements at similar values
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Groundwater plays an irreplaceable role in all aspects of the Loess Plateau In this study the loess phreatic water LPW and bedrock phreatic water BPW in the Ning County area NCA were sampled and analyzed and the characteristics and controlling factors of groundwater were determined by using statistical analysis hydrochemical methods and hydrogeochemical simulation
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The XRD diffraction pattern of CHCFe Fig 1 d and the quantification data from XRD analysis Supplementary Fig S2 reveal that there are four major compounds alumina silica calcite or calcium carbonate and burnt ochre or iron oxide in the composite The composite is dominated by calcite 70% followed by alumina 25% burn ochre 4% and silica 1%
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Film nucleation was enhanced by surface roughness The rate of nucleation and the growth rate of the film increased with cationic calcium and anionic carbonate precursor additions Calcium additions also influenced phase formation introducing a metastable phase octacalcium phosphate and a different phase evolution sequence Full text links
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we observed a clear and reproducible pattern of events during our sfa experiments 1 forces between two calcite surfaces were initially monotonically repulsive with no resolved attraction or adhesion in any of the solutions even for the smoothest calcite surfaces 2 calcite surfaces initially dissolved in contact with all solutions and in …
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Calcite thin films form in the presence of CAP 1 × 10 −3 wt% on a chitin matrix 28 The thin film is composed of nanocrystals with their c axes oriented unidirectionally Figures 5b d
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The 43 Ca isotope was used as internal standard assuming 40 wt % calcium in calcite whereas 44 Ca was used to check for consistency We analyzed six specimens per treatment and carried out five to seven measurements per individual summing up to 276 spot measurements in total
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PCR was performed with 50 μl reaction mixture containing 2 μl of template DNA mM MgCl 2 forward and reverse primers concentration at μM dNTP at a concentration at 50 μM and 1 μl of Taq DNA polymerase and buffer as recommended by the manufacturer MBI Fermentas the PCR reaction was adopted from Rajasekar and Ting PCR products were purified by Montage PCR Clean up kit
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Aug 7 2022TON varied according to the composition of the film being 220 °C for films prepared at [Mg 2 ] = 15 mM and [PAA] = 4 µg mL −1 and 150 °C for preparation conditions of [Mg 2 ] = 10 mM and [PAA] = 4 µg mL −1
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Calcium carbonate mineral specimens werc transformed to fluorite in NH4F solutions With calcite single cryslals the combination of epitaxy and the anisotropy of the reaction led to the formation of elongated hexagonal etch pits The reaction rate was shown to be directly proportional to the F concentration and the surface area The initial
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Some Electrical Properties of Bi2O3 Thin Films was published in Volume 45 Number 2 February 16 on page 751 Plastic Deformation of Calcite Single Crystals Deformed in Compression Parallel to [111] The Role of Different Local Centres in the Determination of the Concentration Dependence of the Intrinsic Emission Intensity in n Type GaAs
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