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Dissertations / Theses on the topic 'Hemihydrate'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

陳國柱 and Kwok-chu Timmy Chan. "Calcium sulphate hemihydrate: effect of humidity in storage." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B21129526.

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2

Chan, Kwok-chu Timmy. "Calcium sulphate hemihydrate effect of humidity in storage /." Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21129526.

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3

Ling, Yuanbing 1970. "Direct preparation of alpha-calcium sulfate hemihydrate from sulfuric acid." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=84283.

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In this work, the crystallization of alpha-calcium sulfate hemihydrate in sulfuric acid solution and the correlation between its properties and preparation conditions by reaction of sulfuric acid with lime (CaO) have been thoroughly investigated. The research involved the study of conversion-dissolution of calcium sulfate dihydrate in H2SO4 solution, the measurement of solubilities, thermo-dynamic calculations and the preparation of alpha-CaSO4 ·0.5 H2O via different methods of reactive mixing of H2SO4 and CaO. It was found that the calcium sulfate solids can saturate the sulfuric acid

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4

Girgin, Seref. "Crystallization of alpha-calcium sulphate hemihydrate by aqueous reaction of calcium chloride with sulphuric acid." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102980.

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The crystallization of alpha-calcium sulphate hemihydrate with simultaneous regeneration of HCl by controlling the reaction of H 2SO4 (2.6M-8M) with concentrated CaCl2 (1-3.5M) solution at 80°C was investigated. The research included 3 studies: (a) study of the kinetics and mechanism of CaSO4 dehydrate (DH) conversion to hemihydrate (HH) and anhydrite (AH) in variable composition CaCl2 -HCl media; (b) reactive crystallization of alpha-hemihydrate in a semi-batch reactor configuration following the LaMer Diagram concept; and (c) the study of crystal growth and metal uptake by seeded crystalliza

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5

Wilson, Craig W. "High-pressure studies of ammonia hydrates." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/8921.

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Ammonia and water are major components of many planetary bodies, from comets and icy moons such as Saturn's Titan to the interiors of the planets Neptune and Uranus. Under a range of high pressures and/or low temperatures known to occur in these planetary bodies, ammonia and water form a series of compounds known as ammonia hydrates. Ammonia and water form three stoichiometric compounds, ammonia hemihydrate, ammonia monohydrate and ammonia dihydrate, which have ammonia-to-water ratios of 2:1, 1:1 and 1:2 respectively. Therefore a good understanding of the three stable ammonia hydrates is requi

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6

Alvarez-Dalama, Alina 1960. "CALCIUM-SULFITE HEMIHYDRATE CRYSTALLIZATION IN LIQUORS WITH HIGH TOTAL DISSOLVED SOLIDS (GROWTH, SIZE DISTRIBUTION, NUCLEATION, HABIT)." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/275528.

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7

Nilles, Vera [Verfasser]. "Insights into the Retarding Mechanism of Linear Sodium Polyphosphates on the Hydration of α-Calcium Sulfate Hemihydrate / Vera Nilles". München : Verlag Dr. Hut, 2012. http://d-nb.info/1021072931/34.

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8

SIDQUI, MUSTAPHA. "Etude du comportement des osteoblastes et des osteoclastes de rat en culture au contact de biomateriaux a usage odontologique." Paris 7, 1998. http://www.theses.fr/1998PA07GA01.

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9

Santos, Thiago Lopes dos. "Estudo do comportamento mecânico do fosfogesso hemi-hidratado." Universidade Federal de Goiás, 2016. http://repositorio.bc.ufg.br/tede/handle/tede/8602.

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Submitted by Franciele Moreira (francielemoreyra@gmail.com) on 2018-06-22T19:42:32Z No. of bitstreams: 2 Dissertação - Thiago Lopes dos Santos - 2016 .pdf: 4251376 bytes, checksum: 76ce02aadab49051cfb47e627123aecc (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2018-06-27T11:16:18Z (GMT) No. of bitstreams: 2 Dissertação - Thiago Lopes dos Santos - 2016 .pdf: 4251376 bytes, checksum: 76ce02aadab49051cfb47e627123aecc (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (M

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10

Rong, Yi. "Formation du sulfate de calcium hémihydrate de type α à partir de gypse par un procédé de dissolution-cristallisation : étude cinétique expérimentale et modélisation". Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEM070/document.

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De nombreuses transformations de solides en solution, polymorphiques ou non, en industrie minérale ou pharmaceutique, se déroulent par la dissolution d'un premier solide en vue de la cristallisation du second. Au lieu de la voie traditionnelle de séchage, la transformation du gypse (sulfate de calcium dihydrate) en alpha-bassanite (sulfate de calcium hémihydrate) peut s’effectuer en solution aqueuse : en augmentant suffisamment la température, le gypse devient plus soluble dans l'eau que l’hémihydrate, qui a alors la possibilité de cristalliser. Un appareillage et un mode opératoire originaux

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11

Schneider, Jana. "Beitrag zur Wirkungsweise von Verzögerern beim Abbinden von Stuckgipsen." Doctoral thesis, TU Bergakademie Freiberg, 2009. https://tubaf.qucosa.de/id/qucosa%3A22717.

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In dieser Arbeit wurde der Einfluss verschiedener Additive (Carbonsäuren, Phosphonsäuren und Retardan P) auf die einzelnen Teilprozesse des Abbindens von Gips an technischen und synthetischen Halbhydraten unter vergleichbaren Bedingungen untersucht. Vorrangig bei der Keimbildung und beim Kristallwachstum wurde ein Einfluss der Additive beobachtet. Das pH-abhängige Wirkungsoptimum kann mit der Speziation der Additive erklärt werden. Ihre Wirkung wird durch Adsorption auf CaSO4-Oberflächen verursacht. Die Untersuchungen ergaben eine bevorzugte Ca-Affinität mit den Flächen (120) und (001) zunehme

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12

Schneider, Jana. "Beitrag zur Wirkungsweise von Verzögerern beim Abbinden von Stuckgipsen." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola&quot, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-27696.

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In dieser Arbeit wurde der Einfluss verschiedener Additive (Carbonsäuren, Phosphonsäuren und Retardan P) auf die einzelnen Teilprozesse des Abbindens von Gips an technischen und synthetischen Halbhydraten unter vergleichbaren Bedingungen untersucht. Vorrangig bei der Keimbildung und beim Kristallwachstum wurde ein Einfluss der Additive beobachtet. Das pH-abhängige Wirkungsoptimum kann mit der Speziation der Additive erklärt werden. Ihre Wirkung wird durch Adsorption auf CaSO4-Oberflächen verursacht. Die Untersuchungen ergaben eine bevorzugte Ca-Affinität mit den Flächen (120) und (001) zunehme

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13

Hsin-YiLiu and 劉欣宜. "Hill Sachs Lesion Repaired by Injectable Alpha Calcium Sulfate Hemihydrate." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/82448628183765848379.

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碩士<br>國立成功大學<br>生物醫學工程學系<br>103<br>The Hill-Sachs lesion is usually caused by shoulder dislocation at glenohumeral joint which is a ball and socket structure, and the dimension of humeral head is larger than glenoid fossa which makes it unstable and easily being dislocated. The dislocation causes the superior labrum anterior to posterior lesion and impinges into the bone, making engaging Hill-Sachs defect that is participated for the range of motion (ROM) in the 30% to 40% circumscribed. The Hill-Sachs lesion has been reported in high possibility of recurrent anterior dislocations. When the

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14

Chuang, Fu-Yu, and 莊馥瑜. "Study on Calcium Sulfate Hemihydrate added Tricalcium Phosphate/Calcium Citrate Bone Cement Composites." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/43s6mg.

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碩士<br>龍華科技大學<br>化工與材料工程系碩士班<br>106<br>Calcium Sulfate Hemihydrate has been used as a bone substitute for more than one hundred years. It has good biocompatibility, good mechanical strength, and short curing time. The disadvantage is that the degradation rate in the human body is too fast, and it is necessary to rely on other chemicals to prolong its absorption. In this study, Calcium Sulfate Hemihydrate was used as the main Bone Cement composite material, Tricalcium Phosphate and Calcium Citrate were added according to different proportions. A series of experiments were carried out on curing t

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15

Azimi, Ghazal. "Evaluating the Potential of Scaling due to Calcium Compounds in Hydrometallurgical Processes." Thesis, 2010. http://hdl.handle.net/1807/24672.

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A fundamental theoretical and experimental study on calcium sulphate scale formation in hydrometallurgical solutions containing various minerals was conducted. A new database for the Mixed Solvent Electrolyte (MSE) model of the OLI Systems® software was developed through fitting of existing literature data such as mean activity, heat capacity and solubility data in simple binary and ternary systems. Moreover, a number of experiments were conducted to investigate the chemistry of calcium sulphate hydrates in laterite pressure acid leach (PAL) solutions, containing Al2(SO4)3, MgSO4, NiSO4, H2SO4

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16

Chang, Ching-Chiou, and 張景邱. "In-vitro study of calcium sulfate hemihydrated and titanium dioxides composites." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/gk6bex.

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碩士<br>國立臺北科技大學<br>材料科學與工程研究所<br>99<br>Calcium sulfate and titanium dioxides are two kinds of bio-ceramics, because of that both two materials have excellent biocompatibility, non-toxic to human bodies, and also, calcium sulfate is a major component of the skeleton, has been extensively studied and used in orthopedics and dental surgery such as bone defect repair materials. Titanium dioxides have well biocompatibility, therefore can make the surface of materials tightly attach with cells; however, Titanium dioxides has poor mechanicalness after hydrated, so it has to compound with another mater

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17

Hsieh, Yueh-chih, and 謝岳池. "In-Vitro Study of Calcium Sulfate Hemihydrated and Calcium Carbonate Composites Material." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/8b6x7z.

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碩士<br>國立臺北科技大學<br>材料及資源工程系研究所<br>99<br>Because of their excellent biocompatibility, both Calcium carbonate (CaSO4) and Calcium carbonate (CaCO3) are widely used as the bone defect repair materials. However, the fast rate of CaSO4 degradation might cause defects during the implantation, which will obstruct the growth of the bone. Calcium carbonates are used as hydration accelerator and filler component within composites, which reduce the setting time and promote the mechanical strength of calcium composite paste. In this experiment, an optimal incorporation ratio of CaCO3 into CaSO4 bone filler

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