Добірка наукової літератури з теми "Citric acid; calcite"
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Статті в журналах з теми "Citric acid; calcite"
Al-Khaldi, M. H., H. A. Nasr-El-Din, S. Mehta, and A. D. Al-Aamri. "Reaction of citric acid with calcite." Chemical Engineering Science 62, no. 21 (November 2007): 5880–96. http://dx.doi.org/10.1016/j.ces.2007.06.021.
Повний текст джерелаAlkhaldi, Mohammed H., Hisham A. Nasr-El-Din, and Hemanta K. Sarma. "Kinetics of the Reaction of Citric Acid With Calcite." SPE Journal 15, no. 03 (September 1, 2010): 704–13. http://dx.doi.org/10.2118/118724-pa.
Повний текст джерелаAlkhaldi, Mohammed H., Hemanta K. Sarma, and Hisham A. Nasr-El-Din. "Diffusivity of Citric Acid During its Reaction With Calcite." Journal of Canadian Petroleum Technology 49, no. 08 (August 1, 2010): 43–52. http://dx.doi.org/10.2118/139570-pa.
Повний текст джерелаZhu, Dong, Jiao, Qin, and Wei. "Use of Sodium Hexametaphosphate and Citric Acid Mixture as Depressant in the Flotation Separation of Scheelite from Calcite." Minerals 9, no. 9 (September 16, 2019): 560. http://dx.doi.org/10.3390/min9090560.
Повний текст джерелаWei, Qian, Liuyang Dong, Fen Jiao, and Wenqing Qin. "Use of citric acid and Fe(III) mixture as depressant in calcite flotation." Colloids and Surfaces A: Physicochemical and Engineering Aspects 578 (October 2019): 123579. http://dx.doi.org/10.1016/j.colsurfa.2019.123579.
Повний текст джерелаWestin, K. J., and Å. C. Rasmuson. "Crystal growth of aragonite and calcite in presence of citric acid, DTPA, EDTA and pyromellitic acid." Journal of Colloid and Interface Science 282, no. 2 (February 2005): 359–69. http://dx.doi.org/10.1016/j.jcis.2004.03.029.
Повний текст джерелаSilveira de Araujo, Isa, and Zoya Heidari. "Quantifying Interfacial Interactions Between Minerals and Reservoir/Fracturing Fluids." Petrophysics – The SPWLA Journal of Formation Evaluation and Reservoir Description 63, no. 6 (December 1, 2022): 658–70. http://dx.doi.org/10.30632/pjv63n6-2022a6.
Повний текст джерелаPrempeh, Clement Owusu, Steffi Formann, Thomas Schliermann, Hossein Beidaghy Dizaji, and Michael Nelles. "Extraction and Characterization of Biogenic Silica Obtained from Selected Agro-Waste in Africa." Applied Sciences 11, no. 21 (November 4, 2021): 10363. http://dx.doi.org/10.3390/app112110363.
Повний текст джерелаDong, Liuyang, Qian Wei, Wenqing Qin, and Fen Jiao. "Effect of iron ions as assistant depressant of citric acid on the flotation separation of scheelite from calcite." Chemical Engineering Science 241 (September 2021): 116720. http://dx.doi.org/10.1016/j.ces.2021.116720.
Повний текст джерелаXu, Yanbo, Longhua Xu, Houqin Wu, Jia Tian, Zhoujie Wang, and XiaoChuan Gu. "The effect of citric acid in the flotation separation of bastnaesite from fluorite and calcite using mixed collectors." Applied Surface Science 529 (November 2020): 147166. http://dx.doi.org/10.1016/j.apsusc.2020.147166.
Повний текст джерелаДисертації з теми "Citric acid; calcite"
Jafari, Abbas. "The Effect of Citric Acid on Amorphous Calcium Carbonate, Mesoporous Magnesium Carbonate and Calcium Magnesium Composite : A brief study." Thesis, Uppsala universitet, Nanoteknologi och funktionella material, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-435989.
Повний текст джерелаPresentationen genomfördes på distans.
Radcliffe, John Scott. "Quantifying the Effects of Microbial Phytase and Diet Acidity on Ca and P Utilization by Weanling Pigs." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36862.
Повний текст джерелаMaster of Science
ALVES, LUCAS C. "Caracterização do cromo presente no lodo de galvanoplastia: avaliação técnica e econômica de processos de remoção." reponame:Repositório Institucional do IPEN, 2016. http://repositorio.ipen.br:8080/xmlui/handle/123456789/26379.
Повний текст джерелаMade available in DSpace on 2016-06-22T12:30:02Z (GMT). No. of bitstreams: 0
Dissertação (Mestrado em Tecnologia Nuclear)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Sanchís, Soler Elena. "Effect of processing on the physicochemical, sensory, nutritional and microbiological quality of fresh-cut 'Rojo Brillante' persimmon." Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/62588.
Повний текст джерела[ES] El caqui persimmon (Diospyros kaki L.) 'Rojo Brillante' es un cultivar astringente que presenta unas propiedades organolépticas y nutricionales excelentes. En la última década, su cultivo en el área mediterránea de España se ha incrementado de manera exponencial con el desarrollo de la tecnología que permite eliminar la astringencia, manteniendo la firmeza del mismo. Esta nueva forma de presentación, aporta numerosas ventajas, entre la que se incluye la posibilidad de ser comercializado como fruta fresca cortada. Sin embargo, el éxito comercial del producto está limitado por el pardeamiento enzimático, la pérdida de firmeza y al crecimiento microbiano. En este contexto, el objetivo de la Tesis ha sido el desarrollo de caqui 'Rojo Brillante' fresco cortado mediante un enfoque que integra el estudio de las características del producto en el momento del procesado y de distintas tecnologías que mantengan la calidad físico-química, sensorial, nutricional y microbiológica del producto durante un periodo que permita su comercialización. En primer lugar, se evaluó el efecto del estado de madurez (MS) en el momento de recolección, el tiempo de almacenamiento a 15 ºC antes del procesado y la aplicación de diferentes antioxidantes en el pardeamiento enzimático y la calidad sensorial y nutricional del caqui 'Rojo Brillante' cortado y almacenado a 5 ºC. La aplicación de 10 g L-1 de ácido ascórbico (AA) ó 10 g L-1 ácido cítrico (CA) controló el pardeamiento enzimático y mantuvo la calidad visual del caqui por encima del límite de comercialización entre 6 y 8 días de almacenamiento a 5 ºC, dependiendo del MS. Sin embrago, la aplicación de estos antioxidantes redujo de manera significativa la firmeza del fruto respecto al control. La combinación de estos antioxidantes con 10 g L-1 de CaCl2 permitió mantener la firmeza en el mismo rango que las muestras control. En un trabajo posterior, la aplicación de 1-metilciclopropeno (1-MCP) permitió procesar caqui almacenado 45 días a 1 ºC con una buena firmeza comercial y el tratamiento antioxidante (10 g L-1 CA + 10 g L-1 CaCl2) consiguió alcanzar un límite de comercialización del producto de 9 días a 5 ºC. La evaluación de distintas atmósferas controladas en combinación con tratamientos antioxidantes (AA o CA), como paso previo al envasado en atmósfera modificada (MAP) del caqui, mostró como más efectiva en el control del pardeamiento enzimático la atmósfera compuesta por 5 kPa O2 (balance N2). Esta atmósfera mantuvo la calidad visual del caqui cortado dentro del límite de comercialización durante 7-9 días a 5 ºC. Por el contrario, la aplicación de altas concentraciones de CO2 (10 ó 20 kPa) dio lugar a un pardeamiento en ciertas zonas de la pulpa que se conoce como 'internal flesh browning'. Estudios posteriores confirmaron el efecto beneficioso del envasado de caqui cortado y tratado con solución antioxidante (CA-CaCl2) en una MAP activa de 5 kPa O2 en la calidad visual del fruto frente a la aplicación de una MAP pasiva. El desarrollo de recubrimientos comestibles con capacidad antioxidante se realizó mediante la incorporación de antioxidantes (10 g L-1 CA + 10 g L-1 CaCl2) a formulaciones a base de proteína de suero lácteo (WPI), proteína de soja (SPI), hidroxipropilmetilcelulosa (HPMC) y pectina. Todos los recubrimientos fueron efectivos controlando el pardeamiento enzimático del caqui cortado, siendo las muestras recubiertas con HPMC y pectina las mejor evaluadas visualmente. En general, el procesado, la aplicación de antioxidantes, el envasado en atmósferas controladas y los distintos recubrimientos comestibles estudiados, si bien no mostraron un efecto claro en los parámetros de calidad nutricional evaluados, no tuvieron un efecto negativo en los mismos. Por otra parte, los frutos cosechados a final de campaña tuvieron mayor actividad antioxidante y contenido en carotenoides.
[CAT] El caqui persimmon (Diospyros kaki L.) 'Rojo Brillante' és un cultiu astringent que presenta unes propietats organolèptiques i nutricionals excel¿lents. En la última dècada, el seu cultiu en l'àrea mediterrània d'Espanya s'ha incrementat de manera exponencial amb el desenvolupament de la tecnologia que permet eliminar l'astringència, mantenint la fermesa del mateix. Esta nova forma de presentació, aporta un gran nombre d'avantatges, entre els quals s'inclou la possibilitat de comercialitzar-lo com fruita fresca processada. No obstant, l'èxit comercial del producte està limitat per pardetjament enzimàtic, la pèrdua de fermesa i el creixement microbià. L'objectiu de la Tesis ha estat en el desenvolupament de caqui 'Rojo Brillante' tallat en fresc mitjançant un enfocament que integra l'estudi de les característiques del producte en el moment del processat i de diferents tecnologies en el manteniment de la qualitat físico-química, sensorial, nutricional i microbiològica del producte durant un període que permeta la seua comercialització. En primer lloc, es va avaluar l'efecte de l'estat de maduresa (MS) en el moment de recol¿lecció, el temps d'emmagatzemament a 15ºC abans del processat i l'aplicació de diferents tractaments antioxidants en el pardetjament enzimàtic i la qualitat sensorial i nutricional del caqui 'Rojo Brillante' tallat i emmagatzemat a 5 ºC. L'aplicació de 10 g L-1 d'àcid ascòrbic (AA) o 10 g L-1 d'àcid cítric (CA) va controlar el pardetjament enzimàtic i va mantenir la qualitat visual del caqui per damunt del límit de comercialització entre 6-8 dies d'emmagatzemament a 5 ºC, depenent del MS. No obstant, l'aplicació d'antioxidants va reduir de manera significativa la fermesa del fruit comparat amb el control. La combinació d'aquestos antioxidants amb 10 g L-1 de CaCl2 va permetre mantenir la fermesa en el mateix rang que les mostres control. En un treball posterior, l'aplicació de 1-metilciclopropeno (1-MCP) va permetre processar caqui emmagatzemat 45 dies a 1 ºC amb una bona fermesa comercial i a més, el tractament antioxidant (10 g L-1 CA + 10 g L-1 CaCl2) va aconseguir un límit de comercialització del producte tallat de 9 dies a 5 ºC. L'avaluació de diferents atmosferes controlades en combinació amb tractaments antioxidants (AA o CA), com a pas previ a l'envasament en atmosfera modificada (MAP) del caqui 'Rojo Brillante, va mostrar com a més efectiva en el control del pardetjament enzimàtic l'atmosfera composta per 5 kPa O2 (balanç N2). Aquesta atmosfera va mantenir la qualitat visual del caqui tallat dins del límit de comercialització durant 7-9 dies a 5 ºC. Per contra, l'aplicació d'altes concentracions de CO2 (10 ó 20 kPa) va donar lloc a un pardetjament en certes zones de la polpa, el qual és conegut com 'internal flesh browning'. Estudis posteriors van confirmar l'efecte beneficiós de l'envasament de caqui tallat i tractat amb solució antioxidant (CA-CaCl2) en una MAP activa de 5 kPa O2 millorant la qualitat visual de la fruita front a l'aplicació de una MAP passiva. El desenvolupament de recobriments comestibles amb capacitat antioxidant es va realitzar mitjançant la incorporació d'antioxidants (CA-CaCl2) en formulacions a base de proteïna de sèrum làctic (WPI), proteïna de soia (SPI), hidroxipropilmetilcel-lulosa (HPMC) i pectina. Tots els recobriments van ser efectius controlant el pardetjament enzimàtic del caqui tallat. No obstant, les mostres recobertes amb HPMC i pectina van ser millor avaluades visualment que la resta de tractaments. En general, el processat, l'aplicació d'antioxidants, l'envasament en atmosferes controlades i els distints recobriments comestibles estudiats, si bé no van mostrar un efecte clar en els paràmetres de la qualitat nutricional avaluats, no van tindre un efecte negatiu en els mateixos. Per altra banda, els fruits recol¿lectats a final de temporada van tenir major activitat antioxidant i contingut en
Sanchís Soler, E. (2016). Effect of processing on the physicochemical, sensory, nutritional and microbiological quality of fresh-cut 'Rojo Brillante' persimmon [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/62588
TESIS
Alkhaldi, Mohammed. "Reaction of citric acid with calcite." Thesis, 2010. http://hdl.handle.net/2440/61968.
Повний текст джерелаThis study is the first one to examine the reaction of citric acid with calcite over a wide range of parameters. Its main focus is to study the effects of different parameters such as initial citric acid concentration and temperature on the citric-calcite reaction. A rotating disk apparatus was used to study the reaction of calcite (CaC0₃) with citric acid. Using the rotating disk theory, the calcite dissolution rates in citric acid solutions were evaluated as a function of rotating speed, initial concentration of citric acid, concentration of magnesium (Mg²⁺) & Iron (Fe³⁺) ions, temperature, and pressure. In addition, Scanning Electron Microscopy (SEM) technique was used to explore the precipitation mechanism of calcium citrate during the reaction of citric acid with calcite. Using this technique, several factors affecting the precipitation of calcium citrate were identified. In this research, citric acid was found to be an effective stimulation fluid at pH values < 4, rotational speeds of (100-1,000 rpm), initial citric acid concentration of 1-7.5 wt%, pressure values of 1,000-1,500 psi, and temperatures of 25-50oC. However, SEM analysis has shown that calcium citrate precipitation occurred during the reaction at the calcite disk. The precipitation of calcium citrate was found be function of disk rotational speed, initial citric acid concentration, and the concentration of both Mg²⁺ and Fe³⁺ ions. More calcium citrate precipitated at high rotational speeds and high initial citric acid concentration. The presence of both Mg²⁺ and Fe³⁺ ions minimized the precipitation of calcium citrate. The rate of calcite dissolution in citric acid was found to be mainly dependent on the rotational speed. In general, at low rotational speeds, below 500 rpm, the calcite dissolution is mainly governed by the mass-transfer rate, while at high rotational speed, above 500 rpm, it is controlled by the surface-reaction rate. The mass-transfer and the surface-reaction mechanism were investigated thoroughly. Using the rotating disk theory, the overall mass transfer coefficient was determined at various rotational speeds, initial citric acid concentrations, and temperature values. The effective diffusion coefficient of citric as was determined at various citric acid concentrations and various temperature values. In addition, the apparent activation energy of calcite dissolution in mass-transfer regime was found to be 37.9 kJ/mol. Finally, a simplified expression was developed to model the reaction kinetics of citric acid with calcite. The model parameters: reaction order, and activation energy were found to be 0.833 and 63.1 kJ/mol, respectively. This study highlights the importance of the initial acid concentration, temperature, and calcium citrate precipitation on the citric acid reaction with calcite. Another important outcome is the effect of various key parameters on the performance of citric acid as a stand-alone stimulation fluid at conditions similar to those present in a typical field case. Findings based on this work provide new insights into the applications, usage, and potential limitations of citric acid. Factors controlling downhole reaction of citric acid with calcite are also disclosed.
Thesis (Ph.D.) -- University of Adelaide, Australian School of Petroleum, 2010
Kao, Hung-Jen, and 高弘任. "Preparation and Luminescence of Strontium-Calcium aluminate Phosphors by Citric Acid Method." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/55904243591490648370.
Повний текст джерела國立成功大學
材料科學及工程學系碩博士班
96
In order to increase the emission intensity and gain the white light phosphor, strontium-calcium aluminate phosphors were synthesized by citric acid method in this study. Influence factors of synthesis & luminescence for phosphors were discussed : as (a) Citrate complex method (ratio of citric acid/metal ions vs. pH value), (b) Citrate gel method (ratio of citric acid/metal ions vs. ratio of ethylene glycol/citric acid), (c) Amount of Eu3+ ions, (d) Amount of Mn2+ ions The precursors were amorphous when the ratio of citric acid/metal ion≧2, pH=2 or the ratio of citric acid/metal ion≧2, the ratio of ethylene glycol/ citric acid≧1. Strontium-calcium aluminate phosphors were obtained and composed of monoclinic CaAl2O4 and hexagonal SrAl2O4 after calcining ar 1000℃/8h for most precursors. It means citrate complex method and citrate gel method can lower the synthesis temperature about 300~400℃. When Eu2+ ions doped into these two host lattices, phosphors showed blue (λp=440nm) and green (λp=520nm) emission bands in PL spectra. The 440nm emission intensity increased with pH value increased in citrate complex method during 1300℃~1400℃ calcination temperature. The PL integral intensity decreased with the amount of ethylene glycol increased in citrate gel method at 1400℃ calcination temperature.. Phosphors synthesized by citrate gel method showed higher PL integral intensity than those synthesized by citrate complex method. In experimental of synthesizing strontium-calcium aluminate phosphors with Eu3+, phosphors were composed of monoclinic CaAl2O4, hexagonal SrAl2O4, and EuCaAl3O7. These phosphors emitted 616nm, 598nm and 587nm red light, and and the PL emission intensity increased with amount of Eu3+ increased during Eu3+ = 1~16 mol%. Them, because of concentration quehching, PL emission intensity decreased with amount of Eu3+ increased when Eu3+>16 mol%. By mixing red phosphors with blue-greed phosphors, color rendering index were increased. In experimental of synthesizing strontium-calcium aluminate phosphors with Mn2+, Mn2+-doped powder didn’t emit, and Eu2+ & Mn2+-doped phosphors showed 440nm、520nm emission band from Eu2+ and 480nm emission band from Mn2+. For all the Eu2+, Mn2+-doped phosphors, PL integral intensity were large then phosphors only doped Eu2+.When increasing the amount of Mn2+, PL integral intensity, 440nm and 520nm emission intensity decreased, but 480nm emission intensity increased. For all these phosphors calcinated during 1300℃~1400℃, 1 mol% Eu2+ & 0.5 mol% Mn2+-doped phosphor showed the maximum PL integral intensity, and mixing powder of twice 18 mol% Eu3+-doped phosphor and 1 mol% Eu2+-doped phosphor showed the best color rendering and closest to white light center.
Wu, Son-Chi, and 吳松記. "Influence of Citric Acid and Calcium Chloride on the Quality of Papaya (Carica papaya L.) Obtained by Air Drying." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/ct4x36.
Повний текст джерелаSoares, Bárbara Cláudia Sá. "Avaliação da eficácia de vários irrigantes na remoção de pó hidróxido de cálcio misturado com gel de clorhexidina." Master's thesis, 2018. http://hdl.handle.net/10284/6662.
Повний текст джерелаIntroduction: The objective of the present study was to compare the efficacy of different irrigant solutions - sodium hypochlorite 3%, ethylenediaminetetraacetic acid 17% and citric acid 10% - in removal of calcium hydroxide powder mixed with 2% chlorhexidine gel, previously applied in two longitudinal grooves made in the root canal. Materials and Methods: 45 monocanal human teeth were selected, molded in silicone cubes in order to create a base; after, they were instrumented with Pro-Taper® files till F3 and divided lengthwise with the use of a microtome. Two grooves were, then, made which were filled with intracanal medication. The teeth were randomly divided into 3 groups (n = 15) and the intracanal medication previously applied was removed using different irrigant solutions: sodium hypochlorite 3%, ethylenediaminetetraacetic acid 17% and citric acid 10%. Ultrasonic irrigation was used as the irrigant solution stirrer technique for all experimental groups and all furrows were photographed after intracanal dressing application and after its removal. Results: The 10% citric acid solution was superior to 3% sodium hypochlorite and 17% ethylenediaminetetraacetic acid in the removal of intracanal dressing (P <0.05). There were no significant differences between the other groups (P> 0.05). An orange-brown precipitate was observed in all teeth of the 3% sodium hypochlorite experimental group but in none of the other groups. Conclusions: The 10% citric acid solution demonstrated greater efficacy than 3% sodium hypochlorite and 17% ethylenediaminetetraacetic acid. The orange-brown precipitate was only found in the group irrigated with 3% sodium hypochlorite.
Книги з теми "Citric acid; calcite"
R. Nourmohammadi, H. Khosravinia, and N. Afzali. Effects of high dietary levels of citric acid on productive performance, serum enzyme activity, calcium and phosphorus retention and immune response in broiler chickens. Verlag Eugen Ulmer, 2015. http://dx.doi.org/10.1399/eps.2015.97.
Повний текст джерелаТези доповідей конференцій з теми "Citric acid; calcite"
Al-Khaldi, Mohammed H., Hisham A. Nasr-El-Din, and Hemanta Kumar Sarma. "Kinetics of the Reaction of Citric Acid With Calcite." In SPE International Symposium on Oilfield Chemistry. Society of Petroleum Engineers, 2009. http://dx.doi.org/10.2118/118724-ms.
Повний текст джерелаGuo, Rui-tang, Wei-guo Pan, Xiao-bo Zhang, Jiang Wu, and Jian-xing Ren. "Dissolution Rate of Limestone for Wet Flue Gas Desulfurization in the Presence of Citric Acid." In ASME 2011 Power Conference collocated with JSME ICOPE 2011. ASMEDC, 2011. http://dx.doi.org/10.1115/power2011-55403.
Повний текст джерелаSugai, Yuichi, Nao Miyazaki, Satohiro Yanagisawa, and Yoshifumi Okamoto. "Study on the application of surfactin for enhanced oil recovery." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/qugo4464.
Повний текст джерелаAlissa, Faisal M., Norah W. Aljuryyed, Salem A. Balharth, and Matteo Leoni. "Calcium Sulfate Scale Dissolution Efficiency by Various Chemicals Additives." In SPE International Conference and Exhibition on Formation Damage Control. SPE, 2022. http://dx.doi.org/10.2118/208819-ms.
Повний текст джерелаMartins, Natalia Pires, Burhan Cicek, Coralie Brumaud, and Guillaume Habert. "Self-Desiccation of a Vernacular CSA Binder." In 4th International Conference on Bio-Based Building Materials. Switzerland: Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/www.scientific.net/cta.1.339.
Повний текст джерелаAkira Kamimura Oura, Leonardo, Paulo José Samenho Moran, Taciani Bella de Jesus, Lucidio Cristovão Fardelone, José Augusto Rosário Rodrigues, José Roberto Nunhez, and Gustavo Paim Valença. "Process for production of bioethanol using Saccharomyces cerevisiae supported on calcium alginate beads coated with chitosan using citric acid." In XXV Congresso de Iniciação Cientifica da Unicamp. Campinas - SP, Brazil: Galoa, 2017. http://dx.doi.org/10.19146/pibic-2017-78015.
Повний текст джерелаЗвіти організацій з теми "Citric acid; calcite"
SUGAMA, T., and L. E. BROTHERS. CITRIC ACID AS A SET RETARDER FOR CALCIUM ALUMINATE PHOSPHATE CEMENTS. Office of Scientific and Technical Information (OSTI), January 2005. http://dx.doi.org/10.2172/15011163.
Повний текст джерелаWicker, Louise, Ilan Shomer, and Uzi Merin. Membrane Processing of Citrus Extracts: Effects on Pectinesterase Activity and Cloud Stability. United States Department of Agriculture, October 1993. http://dx.doi.org/10.32747/1993.7568754.bard.
Повний текст джерела