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Journal articles on the topic 'Potassium carbonate systems'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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1

Taniguchi, T., D. Dobson, A. P. Jones, R. Rabe, and H. J. Milledge. "Synthesis of cubic diamond in the graphite-magnesium carbonate and graphite-K2Mg(CO3)2 systems at high pressure of 9–10 GPa region." Journal of Materials Research 11, no. 10 (1996): 2622–32. http://dx.doi.org/10.1557/jmr.1996.0330.

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Cubic diamond was synthesized with two systems, (1) graphite with pure magnesium carbonate (magnesite) and (2) graphite with mixed potassium and magnesium carbonate at pressures and temperatures above 9.5 GPa, 1600 °C and 9 GPa, 1650 °C, respectively. At these conditions (1) the pure magnesite is solid, whereas (2) the mixed carbonate exists as a melt. In this pressure range, graphite seems to be partially transformed into hexagonal diamond. Measured carbon isotope δ13C values for all the materials suggest that the origin of the carbon source to form cubic diamond was the initial graphite powd

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2

Бетин, А. Н., А. И. Фролов, and В. И. Дорохова. "Potassium Carbonate Increases Cow Productivity." Vestnik APK Verhnevolzh`ia, no. 1(53) (March 30, 2021): 24–27. http://dx.doi.org/10.35694/yarcx.2021.53.1.004.

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Калий является одним из наиболее важных элементов в организме. Он должен поступать в организм ежедневно с кормами, поскольку сохраняется в нём короткое время и является донором катионов. Избыток всосавшегося калия выводится, в основном, через мочу. Он входит в состав буферных систем, поддерживает нормальное осмотическое давление, способствует процессам пищеварения, участвует в процессах синтеза белков и гликогена, тормозит сердечные сокращения. Калий поддерживает солевой баланс организма, состояние которого влияет на синтез белка, рост мышц и укрепление нейронных связей, на энергетическую сист

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3

Il’in, K. K., D. G. Cherkasov та D. V. Kapustina. "Phase Diagrams of the Ternary Systems Potassium Carbonate + Water + Hydrocarbon at 25°С". Izvestiya of Saratov University. New Series. Series: Chemistry. Biology. Ecology 17, № 2 (2017): 163–65. http://dx.doi.org/10.18500/1816-9775-2017-17-2-163-165.

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4

Salabat, Alireza, and Mahmod Hashemi. "Liquid–liquid equilibria for aliphatic alcohols + water + potassium carbonate systems; experiment and correlation." Physics and Chemistry of Liquids 45, no. 2 (2007): 231–39. http://dx.doi.org/10.1080/10683160500520502.

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5

Nicholas, Nathan Johann, Gabriel da Silva, Sandra Kentish, and Geoffrey W. Stevens. "Use of Vanadium(V) Oxide as a Catalyst for CO2Hydration in Potassium Carbonate Systems." Industrial & Engineering Chemistry Research 53, no. 8 (2014): 3029–39. http://dx.doi.org/10.1021/ie403836e.

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6

Li, Kejiang, Jianliang Zhang, Zhengjian Liu, Xiaojun Ning, and Tianqiu Wang. "Gasification of Graphite and Coke in Carbon–Carbon Dioxide–Sodium or Potassium Carbonate Systems." Industrial & Engineering Chemistry Research 53, no. 14 (2014): 5737–48. http://dx.doi.org/10.1021/ie4039955.

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7

Frolova, E. A., D. F. Kondakov, L. I. Avdyushkina, A. V. Bykov, A. N. Shkarupin, and V. P. Danilov. "Phase Equilibria in Water-Salt Systems Consisting of Potassium, Sodium, and Ammonium Carbonates and Anti-Icing Properties of Carbonate Compositions." Theoretical Foundations of Chemical Engineering 52, no. 4 (2018): 587–90. http://dx.doi.org/10.1134/s0040579518040103.

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8

Evdokimov, Andrey N., Alexander V. Kurzin, Andrey A. Sivakov, and Valeriya S. Golikova. "SOLUBILITY IN ALCOHOLS AND ALCOHOLYSIS REACTIONS OF CARBONATES, SULFIDES, CYANIDES, AND PHOSPHATES OF ALKALI METALS." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 61, no. 12 (2018): 14–23. http://dx.doi.org/10.6060/ivkkt.20186112.5735.

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The published data on the solubilities of lithium, sodium, potassium, rubidium and cesium carbonates; sodium bicarbonate; sodium sulphide; potassium and sodium cyanides; orthophosphates, hydro- and dihydroorthophosphates of potassium and sodium, as well as sodium pyrophosphate in methanol, ethanol, 2-propanol, 2-methyl-1-propanol, benzyl alcohol, ethylene glycol, methyl cellosolve and glycerol have been considered and collected. A little bit information for salts has been taken from the most common solubility handbooks, but most of data was selected from scientific articles. There is an acid-b

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9

Mikhniuk, O. N., S. M. Leschev, and P. A. Kasyanchik. "Distribution constants and group increments of organic substances in the extraction systems of water saline–hexane." Proceedings of the National Academy of Sciences of Belarus, Chemical Series 56, no. 2 (2020): 158–65. http://dx.doi.org/10.29235/1561-8331-2020-56-2-158-165.

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In the extraction systems of hexane–aqueous solutions of potassium carbonate, ammonium sulfate and sodium chloride, the distribution of a number of organic compounds (benzyl alcohol, tetrahydrofuran, phenol, aniline, pyridine, pyridazine, pyrimidine, n-butylamine, diethylamine, triethylamine, benzylamine) was studied. It was shown that sodium chloride, the most frequently used as a salting out agent, is noticeably inferior in salting ability to potassium carbonate, dipotassium phosphate and ammonium sulfate, since it contains singly charged ions with a relatively low charge density. Using the

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10

Orjuela, Alvaro, Maria Fernanda Gutierrez, Andrea Suaza, and Jose Luis Rivera. "Production of sucroesters using solvent-free reactive systems containing emulsifiers." Ingeniería e Investigación 38, no. 1 (2018): 16–23. http://dx.doi.org/10.15446/ing.investig.v38n1.61432.

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The transesterification reaction of sucrose and fatty acid methyl esters to produce sucroesters was experimentally evaluated using commercial emulsifiers as compatibility agents. Reactions were carried out at temperatures between 100 and 140°C, using emulsifier concentrations in the range of 5 to 15 %wt, and potassium carbonate as catalyst. Fatty acid methyl esters consumption and sucroesters production was monitored by HPLC analysis of samples. Methyl esters conversions around 40 % were obtained with 68 %wt monoester content in sucroesters mixture. Despite the reaction times were reduced by o

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11

Germano, Roberto, Valentino Tontodonato, Cornelia Hison, Domenico Cirillo, and F. P. Tuccinardi. "Oxhydroelectric Effect: Electricity from Water by Twin Electrodes." Key Engineering Materials 495 (November 2011): 100–103. http://dx.doi.org/10.4028/www.scientific.net/kem.495.100.

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Electricity extraction from water by twin electrodes, mediated by oxygen molecules, that we call Oxhydroelectric Effect, is reported. The extremely simple components of this experimental system are: two platinum (Pt) wire electrodes, a saturated solution of potassium carbonate (K2CO3) in water (H2O) (with pH >10) as electrolyte, and a film of hydrophilic material (Nafion®). A dc power of the order of hundredths of nW was measured for days through a resistor connected to the twin Pt electrodes. The addition of a very small amount of hydrogen peroxide (H2O2) to the electrolyte (water-potassiu

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12

Heydari, Reza, Rohollah Rahimi, Mehrnoosh Kangani, Afshin Yazdani-Elah-Abadi, and Mojtaba Lashkari. "K2CO3: A Mild and Efficient Catalyst for the Synthesis of Pyran Annulated Heterocyclic Systems by Grinding Method Under Solvent-Free Conditions." Acta Chemica Iasi 25, no. 2 (2017): 163–78. http://dx.doi.org/10.1515/achi-2017-0014.

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Abstract The potassium carbonate was applied as a green and efficient catalyst for the one-pot synthesis of pyran annulated heterocyclic systems, via the condensation between aromatic aldehydes, malononitrile and dimedone/1-naphtole by a grinding method at room temperature and solvent-free conditions. Short reaction times, environmentally friendly procedure and excellent yields are the main advantages of this procedure which makes it more economic than other environmentally synthetic methods.

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13

Lu, Yang, Juan Han, Chengzhuo Sheng, Ping Yu, Zhenjiang Tan, and Yongsheng Yan. "Measurement and correlation of phase diagram data for polyoxyethylene (10) lauryl ether and potassium hydroxide/potassium carbonate/potassium phosphate aqueous two-phase systems at 298.15 K." Thermochimica Acta 543 (September 2012): 1–8. http://dx.doi.org/10.1016/j.tca.2012.06.003.

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14

Sheng, Chengzhuo, Juan Han, Yun Wang, et al. "Liquid–liquid equilibria of ionic liquid 1-(2-methoxyethyl)-3-methylimidazolium bromide+potassium carbonate, potassium phosphate, dipotassium phosphate+water aqueous two-phase systems." Fluid Phase Equilibria 364 (February 2014): 55–61. http://dx.doi.org/10.1016/j.fluid.2013.11.046.

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15

Liu, Yi, Li Chen, Bangchen Guo, and Zongcheng Yan. "Measurement and thermodynamic model study on solubility equilibrium of potassium phosphate, potassium hydrogen phosphate, and potassium carbonate in aqueous systems containing the ionic liquid [Bmim]Cl at 298.15K." Calphad 54 (September 2016): 76–81. http://dx.doi.org/10.1016/j.calphad.2016.06.004.

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16

Stenzenberger, H. D., and P. König. "New functionalized poly(arylene-ether ketone)s and their use as modifiers for bismaleimide resin." High Performance Polymers 5, no. 2 (1993): 123–37. http://dx.doi.org/10.1088/0954-0083/5/2/004.

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A series of new functionalized poly(arylene-ether ketone) copolymers has been prepared by the nucleophilic aromatic displacement reaction from 4,4'-difluorobenzophenone and mixtures of bisphenol-A and 2,2'-bis(3-allyl,4-hydroxyphenyl)-hexat Luoropropane (6F-DABA) in the presence of potassium carbonate. The propenyl functional groups are statistically distributed along the polymer backbone and their concentration was tailored by adjusting the concentration of the starting monomers. These functionalized poly(aryleneether ketone)s (FPAEK) were used as thermoplastic modifiers for a bismaleimide (B

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17

Carvalho, Roberta de Almeida, Jussara Alves Penido, Fabiana Aparecida Lobo, et al. "Thermodynamic Investigation of the Aqueous Two-Phase Systems Formed by PEG 400 + Water + Either Sodium Carbonate or Potassium Carbonate at Different Temperatures: Experimental and Correlational Approaches." Journal of Chemical & Engineering Data 64, no. 2 (2019): 448–58. http://dx.doi.org/10.1021/acs.jced.8b00546.

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18

Greco, T., A. Lehmann, M. H. Nejad, and B. Volkert. "Modified Polysaccharides as New Commodity Materials and for Light-Converting Systems: Syntheses, Characterization and Processing." Materials Science Forum 636-637 (January 2010): 779–86. http://dx.doi.org/10.4028/www.scientific.net/msf.636-637.779.

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Potato starch (PS), also one amylose-rich starch (high amylose maize starch, HAMS) and one amlyopectin-rich starch (waxymaize starch, WMS) were used for the syntheses as raw materials. Starch acetates were synthesized by reaction with acetic acid anhydride and potassium carbonate as activator. Tests of thermoplastic processability of the starch acetates were performed by extrusion followed by injection molding to specimens. Glycerine triacetate (triacetin, TAc) was attached as plasticizer to starch acetate. For this system a processing procedure was acquired under variation of different parame

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19

Sytnik, Natalia, Ekaterina Kunitsia, Viktoria Mazaeva, et al. "Establishing rational conditions for obtaining potassium glycerate." Eastern-European Journal of Enterprise Technologies 3, no. 6 (111) (2021): 12–18. http://dx.doi.org/10.15587/1729-4061.2021.231449.

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This paper reports a study into the dependence of efficient glycerate potassium production involving glycerin and potassium hydroxide solution on the process conditions. The concentration of potassium glycerate in the resulting product has been used as a parameter of the efficient glycerate potassium production process. Glycerates of metals are applied to produce articles in the construction industry, electronics, medicine; they are employed as transesterification catalysts to obtain special fats for various purposes, as well as biodiesel fuel. In order to derive potassium glycerate, heating w

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20

XU, C., X. MAO, H. SHEN, and W. CHEN. "ChemInform Abstract: Alkylation in Solid-Liquid Two-Phase Systems. Part 4. Alkylation of Phenylacetonitrile Using Potassium Carbonate as a Base." ChemInform 22, no. 45 (2010): no. http://dx.doi.org/10.1002/chin.199145104.

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21

Wang, Yun, Shiping Hu, Yongsheng Yan, and Weisheng Guan. "Liquid–liquid equilibrium of potassium/sodium carbonate + 2-propanol/ethanol + water aqueous two-phase systems and correlation at 298.15 K." Calphad 33, no. 4 (2009): 726–31. http://dx.doi.org/10.1016/j.calphad.2009.09.006.

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22

Novoselova, Inessa, and Serhii Kuleshov. "PHYSICO-CHEMICAL BASES OF ELECTROLYTIC SYNTHESIS OF CARBON NANOMATERIALS FROM MOLTEN SALTS. Part 1." Ukrainian Chemistry Journal 85, no. 2 (2019): 69–79. http://dx.doi.org/10.33609/0041-6045.85.2.2019.69-79.

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An analysis of the decomposition potentials of lithium, sodium, potassium, calcium, barium, and magnesium carbonates with different versions of cathode products (elemental carbon, carbon monoxide, metal and carbide) in the range of 300-1900 K showed that for K2CO3 deposition of alkali metal on the cathode is most energetically profitable process at all temperatures. For Na2CO3 it is possible to obtain carbon at T < 1000 K. With temperature increase, the predominant process is the reduction of alkali metal. For Li2CO3, CaCO3, BaCO3, MgCO3 at T < 950 °C carbon deposition will be more advan

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23

Zhang, Shihan, Xinhuai Ye, and Yongqi Lu. "Development of a Potassium Carbonate-based Absorption Process with Crystallization-enabled High-pressure Stripping for CO2 Capture: Vapor–liquid Equilibrium Behavior and CO2 Stripping Performance of Carbonate/Bicarbonate Aqueous Systems." Energy Procedia 63 (2014): 665–75. http://dx.doi.org/10.1016/j.egypro.2014.11.074.

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24

Sharifi, Mehdi, Mumtaz Cheema, Kristie McVicar, Lise LeBlanc, and Sherry Fillmore. "Evaluation of liming properties and potassium bioavailability of three Atlantic Canada wood ash sources." Canadian Journal of Plant Science 93, no. 6 (2013): 1209–16. http://dx.doi.org/10.4141/cjps2013-168.

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Sharifi, M., Cheema, M., Mahoney, K., LeBlanc, L. and Fillmore, S. 2013. Evaluation of liming properties and potassium bioavailability of three Atlantic Canada wood ash sources. Can. J. Plant Sci. 93: 1209–1216. Wood ash has the potential to enhance productivity in agricultural systems by influencing soil pH and nutrient availability. The liming properties and fertility values of wood ash from three Atlantic wood ash sources were evaluated in this study. The liming properties were tested using three wood ash sources [JD Irving (IR), New Page (NP), and Brooklyn Power (BP)] and two local lime so

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25

Wood, A. J., A. Viswalingam, P. Glue, J. K. Aronson, and D. G. Grahame-Smith. "Measurement of cation transport in vivo in healthy volunteers after the oral administration of lithium carbonate." Clinical Science 76, no. 4 (1989): 397–402. http://dx.doi.org/10.1042/cs0760397.

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1. We have measured cation transport in vivo in seven healthy volunteers under control conditions and after they had taken lithium carbonate for 21 days in doses which maintained the serum lithium concentration in the range 0.6–0.8 mmol/l. 2. We have measured cation transport in vivo after the administration of an oral load of rubidium chloride, and have found that, although intra-erythrocytic concentrations of rubidium were significantly lower 1 h after the administration of rubidium when the subjects were taking lithium, there was a significant increase in the rate of uptake of rubidium into

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26

Hussein, Abbas Ibrahim, Zuryati Ab-Ghani, Ahmad Nazeer Che Mat, Nur Atikah Ab Ghani, Adam Husein, and Ismail Ab. Rahman. "Synthesis and Characterization of Spherical Calcium Carbonate Nanoparticles Derived from Cockle Shells." Applied Sciences 10, no. 20 (2020): 7170. http://dx.doi.org/10.3390/app10207170.

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Cockle shells are a natural reservoir of calcium carbonate (CaCO3), which is widely used in bone repair, tissue scaffolds, and the development of advanced drug delivery systems. Although many studies report on the preparation of CaCO3, the development of a nanosized spherical CaCO3 precursor for calcium oxide (CaO) that is suitable to be incorporated in dental material was scarce. Therefore, this study aimed to synthesize a nanosized spherical CaCO3 precursor for CaO derived from cockle shells using a sol–gel method. Cockle shells were crushed to powder form and mixed with hydrochloric acid, f

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27

Mikhniuk, O. N., and S. M. Leshchev. "Extraction of medicinal compounds of the benzodiazepines class from aqueous solutions and their following gas chromatographic determination." Proceedings of the National Academy of Sciences of Belarus, Chemical Series 57, no. 2 (2021): 177–84. http://dx.doi.org/10.29235/1561-8331-2021-57-2-177-184.

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In extraction systems hexane–water, hexane–aqueous solutions of inorganic salts (sodium chloride, dipotassium phosphate and potassium carbonate), chloroform–water using the method of gas chromatography–mass spectrometry, the distribution constants of psychotropic substances, limited to movement through the customs border of the Republic of Belarus – alprazolam, lorazepam, temazepam, and as well as clozapine, a medicinal product permitted for movement, were determined. The greatest dynamics of the growth of the distribution constant versus salt concentration was observed in alprazolam. It was f

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28

Drozdov, A. A., M. N. Andreev, D. S. Ratnikov, and E. D. Bychkov. "Historical lead glass in museum collections: determination of the composition by a portable X-ray fluorescence analyzer." Industrial laboratory. Diagnostics of materials 87, no. 6 (2021): 14–19. http://dx.doi.org/10.26896/1028-6861-2021-87-6-14-19.

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A method for the determination of the glass composition in the systems PbO – SiO2 and K2O – PbO – SiO2 with different additives present both in historical and modern art glass is considered. Development of a non-destructive method for determining the glass composition in conditions of museum storage is an important goal for museum practice. We propose a method for determining the composition of those glasses using a portable X-ray fluorescence analyzer (XRF). To select the optimal software suitable for measurements, we have synthesized a number of standard glass samples with the composition de

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29

Zou, B., C. S. McCool, D. W. Green, and G. P. Willhite. "A Study of the Chemical Interactions Between Brine Solutions and Dolomite." SPE Reservoir Evaluation & Engineering 3, no. 03 (2000): 209–15. http://dx.doi.org/10.2118/64536-pa.

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Summary Application of gelled polymer treatments to change the flow characteristics of a reservoir is a viable improved oil recovery technique. Many gel systems are affected by the solution pH in that gel time is pH dependent. The treatment of carbonate reservoir rock is of particular concern because (1) fluid-rock interaction can alter the pH of the injected solution from the design value and (2) dissolution of carbonate can increase the divalent ion concentration, which can also affect gelation behavior. In this study, the interaction between injected potassium chloride brine and dolomite wa

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30

Zulkifli, Aimi Mahirah, Nur Izzah Aqilah Mat Said, Shujahadeen Bakr Aziz, et al. "Characteristics of Dye-Sensitized Solar Cell Assembled from Modified Chitosan-Based Gel Polymer Electrolytes Incorporated with Potassium Iodide." Molecules 25, no. 18 (2020): 4115. http://dx.doi.org/10.3390/molecules25184115.

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In the present work, phthaloyl chitosan (PhCh)-based gel polymer electrolytes (GPEs) were prepared using dimethylformamide (DMF) as a solvent, ethyl carbonate (EC) as a co-solvent, and a set of five quaternaries of potassium iodide (KI) as a doping salt, which is a mixed composition of iodine (I2). The prepared GPEs were applied to dye-sensitized solar cells (DSSC) to observe the effectiveness of the electrolyte, using mesoporous TiO2, which was sensitized with N3 dye as the sensitizer. The incorporation of the potassium iodide-based redox couple in a polymer electrolyte is fabricated for dye-

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31

Noreen, Mubarra, and Isma Younes. "Appraisal of Water Quality Measurements for Canal and Tube Well Water Systems for Agriculture Irrigation in Rechna Doab, Pakistan." International Journal of Economic and Environmental Geology 12, no. 1 (2021): 60–66. http://dx.doi.org/10.46660/ijeeg.vol12.iss1.2021.563.

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The present study was an attempt to assess the surface and ground water quality for irrigation suitability in Rechna Doab. Irrigation water quality at canals and tube well water were analyzed by physicochemical parameters including pH, Electric Conductivity (EC), important cations such as Calcium (Ca2+) Magnesium (Mg2+), Potassium (K+), Sodium (Na+), important anions such as Chloride (Cl-), Bicarbonate (HCO3-), Sulphate (SO42-), three heavy metals including Zinc (Zn), Nickel (Ni) and Copper (Cu). Twelve water samples were collected from the main canals (Lower Gogera canal, Jhang branch canal a

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32

Mikhniuk, O. N., and S. M. Leshchev. "Extraction-chromatographic determination of narcotic drugs and psychotropic substances in objects of complex matrix composition." Doklady of the National Academy of Sciences of Belarus 65, no. 4 (2021): 422–30. http://dx.doi.org/10.29235/1561-8323-2021-65-4-422-430.

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A comparison of the capabilities of two methods for extraction-chromatographic determination of narcotic drugs and psychotropic substances in various objects (syrups, ointments, tablets, herbal mixtures, etc.), the screening methanol method commonly used in the practice of customs and forensic examination and the proposed extraction method based on the use of water phase (in particular, water solutions of salts) for preliminary effective separation of analytes from matrix components was made. In extraction systems of hexane–water, hexane–aqueous solutions of inorganic salts (sodium chloride, d

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33

Korchak, P. A., E. V. Alopina, I. B. Pukinsky, and E. A. Safonova. "Liquid-liquid equilibria of aqueous biphasic systems containing 1-alkyl-3-methylimidazolium amino acid ionic liquids with different anions (L-Leucine, L-Valine, L-Lysine) and inorganic salt (tripotassium phosphate, potassium carbonate)." Fluid Phase Equilibria 525 (December 2020): 112789. http://dx.doi.org/10.1016/j.fluid.2020.112789.

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34

Doveton, John, and Lynn Watney. "Textural and pore size analysis of carbonates from integrated core and nuclear magnetic resonance logging: An Arbuckle study." Interpretation 3, no. 1 (2015): SA77—SA89. http://dx.doi.org/10.1190/int-2014-0050.1.

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The T2 relaxation times recorded by nuclear magnetic resonance (NMR) logging are measures of the ratio of the internal surface area to volume of the formation pore system. Although standard porosity logs are restricted to estimating the volume, the NMR log partitions the pore space as a spectrum of pore sizes. These logs have great potential to elucidate carbonate sequences, which can have single, double, or triple porosity systems and whose pores have a wide variety of sizes and shapes. Continuous coring and NMR logging was made of the Cambro-Ordovician Arbuckle saline aquifer in a proposed C

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35

Schwich, Lilian, Paul Sabarny, and Bernd Friedrich. "Recycling Potential of Lithium–Sulfur Batteries—A First Concept Using Thermal and Hydrometallurgical Methods." Metals 10, no. 11 (2020): 1513. http://dx.doi.org/10.3390/met10111513.

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High-energy battery systems are gaining attention in the frame of global demands for electronic devices and vehicle electrification. This context leads to higher demands in terms of battery system properties, such as cycle stability and energy density. Here, Lithium–Sulfur (Li–S) batteries comprise an alternative to conventional Li-Ion battery (LIB) systems and can be asserted to next-generation electric storage systems. They offer a promising solution for contemporary needs, especially for applications requiring a higher energy density. In a global environment with increasing sustainable econ

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36

Zhuang, Y., S. N. Pandey, C. S. McCool, and G. P. Willhite. "Permeability Modification With Sulfomethylated Resorcinol-Formaldehyde Gel System." SPE Reservoir Evaluation & Engineering 3, no. 05 (2000): 386–93. http://dx.doi.org/10.2118/66045-pa.

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Summary The effect of various parameters on the gelation of the resorcinolformaldehyde (RF) system and a newly developed sulfomethylated resorcinol-formaldehyde (SMRF) system was investigated. The SMRF system was more tolerant of salinity, divalent ion content and pH than the RF system. The SMRF system was tested in laboratory core floods conducted at 41°C (106°F) using Berea sandstone cores, Baker dolomite cores and reservoir rock from the Lansing-Kansas City formation. SMRF forms strong and stable gels at temperatures between 25 and 52°C (77 and 126°F) and in the pH range between 5 and 8.0.

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37

Papadopoulos, Antonis V., and Dionissios P. Kalivas. "Assessing Soil and Crop Characteristics at Sub-Field Level Using Unmanned Aerial System and Geospatial Analysis." Sustainability 13, no. 5 (2021): 2855. http://dx.doi.org/10.3390/su13052855.

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Practicing agriculture is a multiparametric and for this reason demanding task. It involves the management of many factors and thorough strategic planning in a highly variable and uncertain environment. Crop production is a function of agricultural practices as applied in natural resources, such as soil and plants. When referring to conventional agriculture, variability in these resources is neglected, as any field is treated homogenously. On the other hand, site-specific crop management, which was promoted through the advance of technologies, regarding collecting and analyzing data and applyi

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38

Kyrmanov, O. S., and A. V. Lemeshko. "REMINERALIZING THERAPY IN THE PROCESS OF TEETH WHITENING." Ukrainian Dental Almanac, no. 1 (March 23, 2021): 10–14. http://dx.doi.org/10.31718/2409-0255.1.2021.02.

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Resume. Nowadays, aesthetics plays an important role in dentistry due to the increased attention of people to the beauty and attractiveness of the smile, which is known as an effective tool in achieving both personal and professional purposes. Therefore, the whitening of discolored teeth is one of the promising directions in aesthetic dentistry. To date, there is much controversy among dentists about the effectiveness and, the most importantly, the safety of teeth whitening. The prevention of dentin hypersensitivity is among the main tasks associated with the safe and comfortable treatment and

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Dessureault, Yves, James Sangster, and Arthur D. Pelton. "Coupled Phase Diagram/Thermodynamic Analysis of the Nine Common‐Ion Binary Systems Involving the Carbonates and Sulfates of Lithium, Sodium, and Potassium." Journal of The Electrochemical Society 137, no. 9 (1990): 2941–50. http://dx.doi.org/10.1149/1.2087103.

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Souza, Hugo Paiva Tavares de, Carlos Marcello Dias Fernandes, Ricardo de Freitas Lopes, Stéphane Amireault, and Marcelo Lacerda Vasquez. "Mineralizing Events of the World-Class Volta Grande Gold Deposit, Southeastern Amazonian Craton, Brazil." Environmental Sciences Proceedings 6, no. 1 (2021): 19. http://dx.doi.org/10.3390/iecms2021-09537.

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The southeastern region of the Amazonian Craton has been the target of several metallogenetic surveys, which recently led to the identification of the world-class Volta Grande gold deposit with gold reserves of ~3.8 Moz at 1.02 g/t. This deposit is located ~60 km southeast of Altamira city, Pará state, and is hosted by the Três Palmeiras intrusive greenstone belt that is located in the northern Bacajá tectonic domain (2.24–2.0 Ga). The mineralization is hosted by a high-level intrusive and mylonitized suite. Local kinematic indicators suggest dip-slip movement in which the greenstone moves up

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Aliev, Amil R., Isa R. Akhmedov, Murad G. Kakagasanov та Zakir A. Aliev. "ПРЕДПЕРЕХОДНЫЕ ЯВЛЕНИЯ В ОБЛАСТИ СТРУКТУРНОГО ФАЗОВОГО ПЕРЕХОДА В СУЛЬФАТЕ КАЛИЯ". Kondensirovannye sredy i mezhfaznye granitsy = Condensed Matter and Interphases 21, № 3 (2019): 350–57. http://dx.doi.org/10.17308/kcmf.2019.21/1148.

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Методами спектроскопии комбинационного рассеяния света исследованы структурно-динамические свойства и процессы молекулярной релаксации в кристаллическом сульфате калия K2SO4 в интервале температур от 293 до 900 К. Проанализированы температурные зависимости положения максимума v (частоты), ширины w и интенсивности I спектральной полосы, отвечающей полносимметричному колебанию v1(A) сульфат-иона SO4 2–, в спектральном интервале от 963 до 976 см–1. С ростом температуры частота колебания уменьшается. Примерно при 650 K имеют место определённые особенности температурной зависимости v(T). При дальне

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Mitchell, Roger H., Rudy Wahl, and Anthony Cohen. "Mineralogy and genesis of pyrochlore apatitite from The Good Hope Carbonatite, Ontario: A potential niobium deposit." Mineralogical Magazine 84, no. 1 (2019): 81–91. http://dx.doi.org/10.1180/mgm.2019.64.

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AbstractThe Good Hope carbonatite is located adjacent to the Prairie Lake alkaline rock and carbonatite complex in northwestern Ontario. The occurrence is a heterolithic breccia consisting of diverse calcite, dolomite and ferrodolomite carbonatites containing clasts of magnesio-arfvedsonite + potassium feldspar, phlogopite + potassium feldspar together with pyrochlore-bearing apatitite clasts. The apatitite occurs as angular, boudinaged and schlieren clasts up to 5 cm in maximum dimensions. In these pyrochlore occurs principally as euhedral single crystals (0.1–1.5 cm) and can comprise up to 2

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Cole, David L., Savannah J. Kobza, Savannah R. Fahning, et al. "Soybean Nutrition in a Novel Single-Nutrient Source Hydroponic Solution." Agronomy 11, no. 3 (2021): 523. http://dx.doi.org/10.3390/agronomy11030523.

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Hydroponic systems are efficient for studying plant nutrition. It is often desirable to adjust individual nutrients for unique species’ needs and/or to create multiple nutrient deficiencies within the same study. However, this is challenging to do with traditional solutions as nutrients are generally added as dual nutrient salts, such as when varying phosphorus (P) concentration also affects nitrogen concentration; potentially, the chemical form of the nutrient taken up when ammonium phosphate is the source for P. This can create unintended consequences with nutrients other than those intended

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Juliani, Caetano, Rafael Rodrigues de Assis, Lena Virgínia Soares Monteiro, Carlos Marcello Dias Fernandes, José Eduardo Zimmermann da Silva Martins, and Jhoseph Ricardo Costa e Costa. "Gold in Paleoproterozoic (2.1 to 1.77 Ga) Continental Magmatic Arcs at the Tapajós and Juruena Mineral Provinces (Amazonian Craton, Brazil): A New Frontier for the Exploration of Epithermal–Porphyry and Related Deposits." Minerals 11, no. 7 (2021): 714. http://dx.doi.org/10.3390/min11070714.

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This review paper aims to integrate geological, tectonic and metallogenetic data, including new data, and propose a regional model for the gold (and base metal) mineralization in the south Amazonian Craton to support the mineral exploration concerning magmatic–hydrothermal deposits. The Proterozoic evolution of the Amazonian Craton comprises the accretion of terrains to the Archean Carajás Mineral Province. In the Tapajós and Juruena mineral provinces, located at the south part of the Amazonian craton, a long-lived ocean–continent subduction event produced ca. 2.0 to 1.77 Ga continental magmat

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Elmgerbi, Asad, Gerhard Thonhauser, Alexander Fine, Rafael E. Hincapie, and Ante Borovina. "Experimental approach for assessing filter-cake removability derived from reservoir drill-in fluids." Journal of Petroleum Exploration and Production Technology, September 8, 2021. http://dx.doi.org/10.1007/s13202-021-01283-2.

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AbstractPredicting formation damage in cased-hole and open-hole completion wells is of high importance. This is especially relevant when the damage is caused by reservoir drill-in fluids hence being well-bore induced. Cake filter removal has proven to be a good approach to estimate induced damage and to evaluate drill-in fluids’ performance. We present an experimental methodology to evaluate filter cake removal, which could be achieved during the well's initial production. An improved experimental setup, to the ones presented in literature, has been developed to enhance data quality. A twofold

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Shin, Donghyun, and Debjyoti Banerjee. "Enhanced Specific Heat Capacity of Nanomaterials Synthesized by Dispersing Silica Nanoparticles in Eutectic Mixtures." Journal of Heat Transfer 135, no. 3 (2013). http://dx.doi.org/10.1115/1.4005163.

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Anomalous enhancements in the specific heat capacity values of nanomaterials were measured in this study. Silica nanoparticles (∼2–20 nm) were dispersed into eutectic of lithium carbonate and potassium carbonate (62:38 by molar ratio) at 1.5% mass concentration. The specific heat capacity measurements were performed using a differential scanning calorimeter (DSC). The specific heat capacity of the silica nanocomposite (solid phase) was enhanced by 38–54% and the specific heat of the silica nanofluid (liquid phase) was enhanced by 118–124% over that of the pure eutectic. Electron microscopy of

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Nieto, Olga María, Emilia Fernández-Ondoño, and Juan Castro. "Sustainable agricultural practices for Mediterranean olive grove. Effect of soil management on soil properties ." Spanish Journal of Soil Science 2 (September 5, 2014). http://dx.doi.org/10.3232/sjss.2012.v2.n1.05.

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The olive is one of the most important crops grown in the Mediterranean region, both in terms of total surface area and its socioeconomic and environmental impact. In the present work, the main soil parameters of olive groves under different management systems are compared to an uncultivated area. Soil samples were collected and analysed from native vegetation (NV) and olive groves under three different soil management systems: conventional tillage (T), no-tillage bare soil (NT) and cover crop (CC). The groves (T, NT, and CC) increased the calcium carbonate content in the uppermost part of the

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Lifanenkova, T. P., R. V. Bizhoev, and M. V. Bizhoev. "Influence of Long-Term Application of Fertilizer Systems on Fertility of Ordinary Carbonate Chernozem in the Conditions of the Central Ciscaucasia." KnE Life Sciences, November 25, 2019. http://dx.doi.org/10.18502/kls.v4i14.5628.

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The paper studies the influence of systematic application recommended and estimated mineral (N69P63K45 and N141P68K60) and organomineral (manure 8 t/ha + N44P42K24and manure 15 t/ha + N87P36K7) fertilizer systems within grain-grass-hoe crop rotation on density, porosity, structural condition of soil, water stability of structural units, water permeability, change of humus content and basic nutrition elements in rainfed conditions and at irrigation in comparison with their initial content and with indicators in control option – without fertilizers and irrigation throughout long-term field exper

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Mayo, A. L., and D. G. Tingey. "Shallow groundwater chemical evolution, isotopic hyperfiltration, and salt pan formation in a hypersaline endorheic basin: Pilot Valley, Great Basin, USA." Hydrogeology Journal, June 21, 2021. http://dx.doi.org/10.1007/s10040-021-02371-7.

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AbstractEndorheic basin brines are of economic significance as sources of boron, iodine, magnesium, potassium, sodium sulfate, sodium carbonate, and tungsten, and they are a major source of the critical metal lithium. Although evaporation is the primary hypersalinization driver for evaporative water bodies, recent investigations have proposed more novel mechanisms for some subsurface brine. This investigation explores shallow groundwater hypersalinization. The chemical evolution and isotopic fractionation of shallow hypersaline groundwater in the clay-rich arid endorheic basin sediments of Pil

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Fuentes-Guzmán, Edith, Eduardo González-Partida, Antoni CamprubÍ, et al. "The Miocene Tatatila–Las Minas IOCG skarn deposits (Veracruz) as a result of adakitic magmatism in the Trans-Mexican Volcanic Belt." Boletín de la Sociedad Geológica Mexicana 72, no. 3 (2020). http://dx.doi.org/10.18268/bsgm2020v72n3a110520.

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The Cu- and Au-rich Tatatila–Las Minas IOCG skarn deposits in Veracruz (central-east Mexico) are circumscribed to the earliest stages of the Trans-Mexican Volcanic Belt (TMVB) and stand for a metallogenic province directly linked to its tectonomagmatic dynamics. This is the first well-documented case for such metallogenic province. These deposits were formed as skarns between rocks of the Mesozoic carbonate series and Miocene intermediate to acid hypabyssal rocks. New U-Pb zircon and 40Ar/39Ar ages provide evidence for four epochs of magmatic activity in the area: (1) early Permian (Artinskian

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