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Dissertations / Theses on the topic 'Specific surface area packing'

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Published: 30 May 2022

Last updated: 31 May 2022

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1

Ghasemi, Yahya. "Aggregates in Concrete Mix Design." Licentiate thesis, Luleå tekniska universitet, Byggkonstruktion och -produktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-61659.

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The importance of studying the behaviour and properties of concrete can be highlighted by considering the fact that concrete is the most used man-made material in the world. The very first step in making concrete is its mix design and deciding the type and amount of constitutes used in the production of concrete which should fulfil the requirements of the final product. Mix design models are commonly used for the purpose of proportioning concrete ingredients while anticipating the properties of the final product. The current document deals with the commonly used principals in mix design model

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2

Бабенко, Володимир Миколайович. "Закономірності гідродинаміки і масообміну в процесах ректифікації суміші розчинників на новому контактному пристрої". Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/22718.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.17.08 – процеси та обладнання хімічної технології. – Національний технічний університет "Харківський політехнічний інститут" Міністерства освіти і науки України, м. Харків, 2016. Дисертацію присвячено дослідженню процесу поділу рідинних гетерогенних сумішей на регулярних контактних пристроях з різними геометричними параметрами насадочних елементів. Досліджено механізм процесу утворення рідинної плівки для колонних апаратів, що застосовуються в ректифікації у відповідності з гідродинамічними характеристиками

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3

Бабенко, Володимир Миколайович. "Закономірності гідродинаміки і масообміну в процесах ректифікації суміші розчинників на новому контактному пристрої". Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/22717.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.17.08 – процеси та обладнання хімічної технології. – Національний технічний університет "Харківський політехнічний інститут" Міністерства освіти і науки України, м. Харків, 2016. Дисертацію присвячено дослідженню процесу поділу рідинних гетерогенних сумішей на регулярних контактних пристроях з різними геометричними параметрами насадочних елементів. Досліджено механізм процесу утворення рідинної плівки для колонних апаратів, що застосовуються в ректифікації у відповідності з гідродинамічними характеристиками

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4

Elfmarková, Veronika. "Vliv jemnozrnných příměsí na charakter pórového systému betonu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-225906.

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Literature does not provide a satisfactory answer to maximum and minimum particle size or the particle size of the mortar phase especially for optimal porosity of concrete. To overcome the shortcomings of the design methods were thought to design a new method for design of concrete mix. This idea is based on a complex analysis of powder materials (determination of granular properties, shape factor of fillers, porosity, packing of powder materials, surface area, etc.) and subsequently to assess the influence to pore system of concrete and physical and mechanical properties in hardened state of

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5

Wong, Hin-cheong Henry. "Effects of water content, packing density and solid surface area on cement paste rheology." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B39326032.

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Wong, Hin-cheong Henry, and 黃憲昌. "Effects of water content, packing density and solid surface area on cement paste rheology." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39326032.

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7

Dubois, Isabelle E. "Specific surface area of some minerals commonly found in granite." Licentiate thesis, KTH, Industriell ekologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-41259.

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The specific surface area, determined by the BET method, is a parameter often used to scale results of mineral studies of surface reactions in terms of rate and capacity to the field scale. Such extrapolations of results from small-scale laboratory experiments to the field-scale are important within many environmental applications. An example of this is for the prediction of radionuclide retention in the bedrock surrounding a deep repository for radioactive waste, following failure of the engineered barriers, where radionuclides may sorb onto minerals constituting the geological environment. A

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8

Sharif, Shasad, Lynn DiMemmo, Martha Davidovich, and Beth Sarsfield. "Applicability of specific surface area determination on pharmaceuticals by inverse gas chromatography." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-185429.

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9

Sharif, Shasad, Lynn DiMemmo, Martha Davidovich, and Beth Sarsfield. "Applicability of specific surface area determination on pharmaceuticals by inverse gas chromatography." Diffusion fundamentals 16 (2011) 56, S. 1, 2011. https://ul.qucosa.de/id/qucosa%3A13798.

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10

Remmen, Krystle D. "A REACTIVE TRACER METHOD FOR THE MEASUREMENT OF SPECIFIC SURFACE AREA IN EGS RESERVOIRS." Thesis, California State University, Long Beach, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1527408.

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<p> Early thermal breakthrough is an issue of concern in the geothermal industry, especially with regard to engineered geothermal systems (EGS). Determination of the specific surface area (SSA) of the fluid/rock interface in an EGS is vital to predicting early thermal breakthrough. An approach to this problem involving the application of tracers with different sorption properties (lithium, bromide, and deuterium) is presented. Upon injection into a reservoir, these tracers react along the fluid/rock interface to varying degrees. The resulting breakthrough separation at the extraction well can

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11

Lazaro, A., J. W. Geus, and H. J. H. Brouwers. "Influence of the Production Process Conditions on the Specific Surface Area of Olivine Nano-Silicas." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/34893.

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The production of nano-silica by the olivine route is a cheaper and greener method than the commercial methods (neutralization of sodium silicate solutions and the flame hydrolysis) because of the low cost of raw materials and the low energy requirements. The produced olivine nano-silica has a specific surface area between 100-400 m2/g and primary particles between 10 to 25 nm (agglomerated in clusters). The process conditions and the ripening process influence the properties of nano-silica in the following ways i) the cleaner the nano-silica is the higher the specific surface area is; i

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12

ALBANEZ, NELMA E. F. K. "Obtencao de oxido de cerio com alta area superficial especifica." reponame:Repositório Institucional do IPEN, 1996. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10474.

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Furuhashi, Toyohisa. "STUDY OF PROPANE ADSORPTION ISOTHERM ON PURIFIED HIPCO SINGLE-WALLED CARBON NANOTUBES." Available to subscribers only, 2009. http://proquest.umi.com/pqdweb?did=1967978731&sid=2&Fmt=2&clientId=1509&RQT=309&VName=PQD.

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14

Khadka, Suraj. "A Numerical Study of the Coupled Geomechanical Processes in Sinkholes." University of Toledo / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1532970968316002.

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15

Griend, M. C. van de, A. Lazaro, and H. J. H. Brouwers. "The Effect of Hydrothermal Treatment on Olivine Nano-Silica." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/34915.

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This paper provides an overview of the effects of ripening the olivine nano-silica to form particles with a lower specific surface area for optimal use in high performance concrete. The nano-silica was ripened using a hydrothermal treatment in a mixed batch reactor at 90 °C, pH ranging from 8 to 10 and a silica weight percentage of three and six percent. The specific surface area of the olivine nano-silica can be reduced by 62 percent by Ostwald ripening in 22 hours. This reduction corresponds to a 80 percent drop of the micropore surface area and a 57 percent drop of the external surf

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16

Giberti, Sara. "Surface Area enhancement of biochar and forestry biomass through activation by means of chemical impregnation with ZnCl2 and H3PO4." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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This dissertation is dedicated to the research of methods for the production of activated carbon by means of chemical impregnation from renewable resources such as waste biochar and forestry biomass. The goal of the research is to find a method that generates high performances activated carbon which can be scaled up and added to the supply chain of an already existing gasification concept located in Innsbruck, Austria. Biochar has been impregnated with ZnCl2 in ratios of 1:1 and 5:1 and activated in a mixed bed reactor in presence of H2O steam in a temperatures range of 500 and 700 °C for 3

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17

Barančíková, Miriama. "Vysoce porézní keramické materiály připravené metodou Spark Plasma Sintering." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-442603.

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Porous ceramic materials are an interesting group of materials due to a wide range of physical properties, low density, and good permeability. Production of a monolith with a shape stability that would also have a high specific surface area and high porosity is a common problem with porous ceramics. The goal of this work was to maintain the high specific surface area and to produce a monolith with a shape stability. Two forms of porous silica nanofibers (as prepared and milled) were used and partially sintered using the Spark Plasma Sintering method (SPS). Different sintering times and tempera

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18

Jackson, Gavin John. "Local adsorption structure determination of chemically-specific species using normal incidence X-ray standing wavefields." Thesis, University of Warwick, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343835.

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ZAMPIERON, JOAO V. "Caracterizacao fisica de particulas e reologica de um sistema heterogeneo utilizado em moldalgem de pos por injecao a baixa pressao." reponame:Repositório Institucional do IPEN, 2001. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10979.

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Libois, Quentin. "Evolution des propriétés physiques de neige de surface sur le plateau Antarctique. Observations et modélisation du transfert radiatif et du métamorphisme." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENU026/document.

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Le bilan d'énergie de surface du Plateau Antarctique est essentiellement contrôlé par les propriétés physiques des premiers centimètres du manteau neigeux. Or l'évolution de cette neige de surface est complexe car elle dépend de processus fondamentalement imbriqués: vitesse de métamorphisme, profils de température, pénétration du rayonnement solaire, précipitations, transport de neige par le vent, etc. L'objectif de ces travaux de thèse est d'étudier ces diverses composantes et leur couplage afin de simuler l'évolution de la densité de la neige et de la taille de grain (surface spécifique) sur

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21

Banjara, Shree Ram. "STUDY OF ADSORPTION OF CARBON DIOXIDE ON CARBON BASED NANO-MATERIALS AND EVALUATION OF ISOSTERIC HEAT, SPECIFIC EFFECTIVE SURFACE AREA AVAILABLE FOR ADSORPTION AND ADSORPTION KINETICS." OpenSIUC, 2012. https://opensiuc.lib.siu.edu/theses/915.

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Single-walled dahlia-like carbon nanohorns treated with H2O2 for 3hrs at 150 ℃ were used as sorbent in a study of CO2 adsorption. This treatment ensures that the nanohorns are open and they have their interior space available for adsorption. Volumetric adsorption measurements on open spherical aggregates of dahlia-like single walled carbon nanohorns were performed at seven different temperatures between 158.66 K and 208.68 K. The waiting time for reaching the equilibrium pressure after adding a dose increased with sorbent loading. Unlike Ne and CF4 adsorption isotherms measured on similar subs

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22

Carmagnola, Carlo Maria. "Mesure, analyse et modélisation des processus physiques du manteau neigeux sec Implementation and evaluation of prognostic representations of the optical diameter of snow in the SURFEX/ISBA-Crocus detailed snowpack model Snow spectral albedo at Summit, Greenland: measurements and numerical simulations based on physical and chemical properties of the snowpack." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENU014.

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La neige est un matériau poreux dont la microstructure change en permanence. L'ensemble de ces transformations, qui prend le nom de ``métamorphisme", est susceptible d'affecter les propriétés thermiques, mécaniques et électromagnétiques de la neige au niveau macroscopique. En particulier, les échanges d'énergie et de matière à l'intérieur du manteau neigeux et entre la neige et l'atmosphère sont fortement influencés par l'évolution au cours du temps de la microstructure de la neige. Une représentation adéquate du métamorphisme dans les modèles de manteau neigeux s'avère donc cruciale. La micro

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23

Delibas, Tughan. "Effects Of Granulated Blast Furnace Slag Trass And Limestone Fineness On The Properties Of Blended Cements." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614072/index.pdf.

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The aim of this research was to determine the effects of the fineness of different mineral additives on loss on ignition, heat of hydration, physical, mechanical and chemical properties of blended cements. For that purpose, portland cement clinker was replaced with granulated blast furnace slag (GBFS), natural pozzolan (NP) and limestone (L) at 6%, 20% and 35% replacement levels. Blended cements containing GBFS and NP were ground to a fineness of 3000, 5000 and 6000 cm2/g. Cements containing L were ground to 3000 cm2/g, 4000 cm2/g and 4500 cm2/g. All of the blended cement types mentioned above

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Brňák, Matúš. "Heterogenní radikálová modifikace polypropylenu." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2018. http://www.nusl.cz/ntk/nusl-376886.

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The diploma thesis deals with the heterogeneous technique of preparation of grafted polypropylene g maleic anhydride (PP-g-MAH). The knowledge of the course of the reaction and its impact on the PP grafting process are summarized in the theoretical part. The preparation of the grafted PP was carried out in a fluidized polymerization reactor at 115 °C, speed of mixing 210 rpm, reaction time 60 min and pressure 6 bar. The amount of grafted MAH was monitored by using a MAH concentration 3 and 5 wt% and an initiator concentration 0.25; 0.5; 1; and 1.5 wt%. Modification efficiency was compared by u

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25

Pronk, Geertje Johanna [Verfasser], Ingrid [Akademischer Betreuer] Kögel-Knabner, and Kai Uwe [Akademischer Betreuer] Totsche. "Biogeochemical interfaces in natural and artificial soil systems: specific surface area, phenanthrene sorptive properties and formation of organo-mineral associations / Geertje Johanna Pronk. Gutachter: Kai Uwe Totsche. Betreuer: Ingrid Kögel-Knabner." München : Universitätsbibliothek der TU München, 2011. http://d-nb.info/1019587717/34.

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26

Xia, Changlei. "Biomass-Derived Activated Carbon Through Self-Activation Process." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc849716/.

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Self-activation is a process that takes advantage of the gases emitted from the pyrolysis process of biomass to activate the converted carbon. The pyrolytic gases from the biomass contain CO2 and H2O, which can be used as activating agents. As two common methods, both of physical activation using CO2 and chemical activation using ZnCl2 introduce additional gas (CO2) or chemical (ZnCl2), in which the CO2 emission from the activation process or the zinc compound removal by acid from the follow-up process will cause environmental concerns. In comparison with these conventional activation processe

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André, Bérangère. "Structure et réactivité de poudres d’aluminium nanostructurées." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4301.

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Les poudres d'aluminium sont depuis longtemps utilisées comme additifs dans de nombreuses formulations pour la pyrotechnie ou les propergols. Introduites en quantité relativement faible dans les propergols des fusées, elles permettent d'accroître significativement les vitesses de combustion. Cependant, les mécanismes à l'origine de cette meilleure réactivité restent encore mal compris et vont bien au-delà d'une simple explication en terme d'augmentation de l'état de division. Au cours de cette thèse nous avons élaboré des poudres d'aluminium par broyage à haute énergie, technique mécanique peu

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Alhawat, Musab M. "Bond Performance between Corroded Steel and Recycled Aggregate Concrete Incorporating Nano Silica." Thesis, University of Bradford, 2020. http://hdl.handle.net/10454/18430.

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The current research project mainly aims to investigate the corrosion resistance and bond performance of steel reinforced recycled aggregate concrete incorporating nano-silica under both normal and corrosive environmental conditions. The experimental part includes testing of 180 pull-out specimens prepared from 12 different mixtures. The main parameters studied were the amount of recycled aggregate (RCA) (i.e. 0%, 25%, 50% and 100%), nano silica (1.5% and 3%), steel embedment length as well as steel bar diameter (12 and 20mm). Different levels of corrosion were electrochemically in

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Théodet, Manuel. "Nouvelle génération de précurseurs "bulk" de catalyseur d'hydrodésulfuration synthétisés en milieu fluides supercritique." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2010. http://tel.archives-ouvertes.fr/tel-00559113.

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L'objet de ce travail de thèse porte sur la synthèse originale en milieu fluide supercritique (FSC) de précurseurs « bulk » de catalyseurs d'hydrodésulfuration (HDS) à haute surface spécifique (SBET), destinés à l'HDS de composés soufrés réfractaires tels que le 4,6 diméthyldibenzothiophène (4,6¬ DMDBT). Ce projet a été réalisé en collaboration entre l'Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB-CNRS) et l'Instituto de Tecnología Química de Valencia (ITQ-CSIC) dans le cadre du réseau européen d'excellence Functional Advanced Materials and Engineering of Hybrids and Ceramics (

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Darpentigny, Clémentine. "Fonctionnalisation de structures de nanocellulose en fluide supercritique pour des applications de pansements antimicrobiens Ice-templated freeze-dried cryogels from tunicate cellulose nanocrystals with high specific surface area and anisotropic morphological and mechanical properties Highly Absorbent Cellulose Nanofibrils Aerogels Prepared by Supercritical Drying." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAV052.

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Dans un contexte où la demande en matériaux médicaux innovants augmente et où la question environnementale devient une préoccupation majeure, l’objectif du projet a été de préparer des pansements antimicrobiens par la voie la plus verte possible. Pour cela, les nanocelluloses ont été retenues comme briques de base biosourcées et biocompatibles pour le design d’architectures poreuses et leur fonctionnalisation par des agents antimicrobiens a été ensuite entreprise en milieu CO2 supercritique (CO2sc) utilisé comme alternative aux solvants organiques en tirant profit de ses spécificités telles qu

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Carmagnola, Carlo Maria. "Mesure, analyse et modélisation des processus physiques du manteau neigeux sec." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-01070005.

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La neige est un matériau poreux dont la microstructure change en permanence. L'ensemble de ces transformations, qui prend le nom de ''métamorphisme", est susceptible d'affecter les propriétés thermiques, mécaniques et électromagnétiques de la neige au niveau macroscopique. En particulier, les échanges d'énergie et de matière à l'intérieur du manteau neigeux et entre la neige et l'atmosphère sont fortement influencés par l'évolution au cours du temps de la microstructure de la neige. Une représentation adéquate du métamorphisme dans les modèles de manteau neigeux s'avère donc cruciale. La micro

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32

Islam, G. "Evaluating reactivity and sorptivity of fly ash for use in concrete construction." Thesis, University of Dundee, 2012. https://discovery.dundee.ac.uk/en/studentTheses/94122abd-aa82-4c91-85ea-079505e14489.

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This thesis describes research carried out to investigate techniques for (i) rapidly assessing the reactivity of fly ash; and (ii) evaluating its interaction with air-entraining admixtures (AEAs), both with regard to use in concrete. The materials considered for the project included, 54 fly ashes from 8 UK sources, and an additional three materials from Bangladesh, covering a range of fineness, loss-on-ignition (LOI) and production conditions (run-of-station, carbon removed, air-classified, co-combustion, oxy-fuel technology); Portland Cements (PCs) from five UK sources with various properties

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Shin, Hyeon Ung. "Catalytic property of fiber media supported palladium containing alloy nanoparticles and electrospun ceramic fibers biodurability study." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1458404276.

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Dazon, Claire. "Expositions professionnelles aux nanomatériaux lors de la manipulation de poudres : relations entre les propriétés des poudres et les caractéristiques des aérosols émis." Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0022.

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Ce travail s’inscrit dans le cadre de l’évaluation des risques professionnels aux nanomatériaux lors de la manipulation de poudres. Cette démarche est encore contrariée à la fois par l’absence d’une méthodologie de repérage des nanopoudres sur les lieux de travail, opérationnelle et accessible notamment aux hygiénistes, mais également de stratégies robustes de mesurage des expositions. La démarche de recherche a mis en œuvre une campagne expérimentale de caractérisation de poudres industrielles choisies pour leurs larges gammes de propriétés et représentatives des matériaux les plus rencontrés

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Lima, Rita Karolinny Chaves de. "Perovskitas contendo lantânio, ferro e cobalto - melhoramento de propriedades texturais via síntese por nanomoldagem e avaliação como catalisadores na redução de NO com CO." Universidade Federal de São Carlos, 2008. https://repositorio.ufscar.br/handle/ufscar/3872.

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Made available in DSpace on 2016-06-02T19:55:24Z (GMT). No. of bitstreams: 1 2075.pdf: 4577723 bytes, checksum: 80abdc876165c000f61328875ff2a061 (MD5) Previous issue date: 2008-10-20<br>Financiadora de Estudos e Projetos<br>Mixed oxides with perovskite structure have high potential as catalysts in gas depollution processes and particularly in the abatement of nitrogen oxides (NOx). Such solids could be considered as a promising alternative for the replacement of noble metals based catalysts, whose use is predominant. Great flexibility of composition, easy synthesis, low cost and high therm

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Elsner, Antje. "Computergestützte Simulation und Analyse zufälliger dichter Kugelpackungen." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2010. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-61829.

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In dieser interdisziplinär geprägten Arbeit wird zunächst eine Übersicht über kugelbasierte Modelle und die algorithmischen Ansätze zur Generierung zufälliger Kugelpackungen gegeben. Ein Algorithmus aus der Gruppe der Kollektiven-Umordnungs-Algorithmen -- der Force-Biased-Algorithmus -- wird ausführlich erläutert und untersucht. Dabei werden die für den Force-Biased-Algorithmus als essenziell geltenden Verschiebungsfunktionen bezüglich ihres Einflusses auf den erreichbaren Volumenanteil der Packungen untersucht. Nicht nur aus der Literatur bekannte, sondern auch neu entwickelte Verschiebungsf

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Prehl, Janett, and Constantin Huster. "Morphology on Reaction Mechanism Dependency for Twin Polymerization." MDPI, 2019. https://monarch.qucosa.de/id/qucosa%3A34346.

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An in-depth knowledge of the structure formation process and the resulting dependency of the morphology on the reaction mechanism is a key requirement in order to design application-oriented materials. For twin polymerization, the basic idea of the reaction process is established, and important structural properties of the final nanoporous hybrid materials are known. However, the effects of changing the reaction mechanism parameters on the final morphology is still an open issue. In this work, the dependence of the morphology on the reaction mechanism is investigated based on a previously intr

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Diab, Walaa. "Étude des propriétés physico-chimiques et colloïdales du bassin de la rivière Litani, Liban." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0063/document.

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Cette thèse s’inscrit dans l’une des thématiques du «Laboratoire MCEMA», ayant pour projet l’étude physico-chimique des eaux de rivière et l’évaluation de l’influence des activités humaines sur la qualité de l’eau de la rivière LITANI. Ce travail est divisé en trois grandes parties. La 1ère partie a consisté d’étudier les paramètres physico-chimiques (T°, pH, EC, TSS, TDS, ion, etc.) au niveau de l’eau. La 2ème partie s’est concentrée autour de l’analyse des sédiments. Nous avons étudié les sédiments de la rivière de Litani, leurs natures, leurs granulométries, leurs propriétés physico-chimiqu

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Mikhailova, Olesia. "Studium možností efektivního využívání a aktivace aktivních příměsí do betonu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226737.

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The theoretical part describes the admixtures that are used in cement replacement. Here also summarizes the findings on the influence of granulomentry, grain shape and fineness of admixtures on the density of the cement matrix. The practical part is experimentally verified the influence of fineness admixtures and grain size on the mechanical properties of concrete. Also, the rheological properties of cement are compared with admixtures depending on the type and dosage and time.

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Lédl, Matěj. "Návrh koncepce využívání mikropříměsí pro betony vysokých užitných vlastností." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226739.

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The modern, contemporarily used cement composite types make use of various additives. This diploma thesis is focused on designs of mortars that have been enriched with micro and nano additives, which lead to higher mechanical strength through optimized grading of mortar mixes. This thesis also evaluates the influence of material properties on resulting properties of mortars in fresh and hardened state.

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Augustine, Robin. "Electromagnetic modelling of human tissues and its application on the interaction between antenna and human body in the BAN context." Phd thesis, Université Paris-Est, 2009. http://tel.archives-ouvertes.fr/tel-00499255.

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Les réseaux BAN (Body Area Network) révolutionnent le concept de la surveillance et de la prise en charge à distance de la santé du patient. Le BAN fournit des informations sur l'état de santé du patient en temps réel quelque soit l'endroit où il se trouve. Dans le « télé monitoring », des capteurs de mouvement, de respiration ou du rythme cardiaque placés à l'intérieur ou sur le corps humain transmettent des données via le réseau sans fil constituant le BAN, une antenne étant associée à chaque nœud du réseau. La communication peut être in/on, on/on ou on/off selon que les antennes sont placée

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Tunková, Martina. "Městské lázně." Master's thesis, Vysoké učení technické v Brně. Fakulta architektury, 2010. http://www.nusl.cz/ntk/nusl-215713.

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Tsai, Robert Edison. "Mass transfer area of structured packing." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-05-1412.

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The mass transfer area of nine structured packings was measured as a function of liquid load, surface tension, liquid viscosity, and gas rate in a 0.427 m (16.8 in) ID column via absorption of CO₂ from air into 0.1 mol/L NaOH. Surface tension was decreased from 72 to 30 mN/m via the addition of a surfactant (TERGITOL[trademark] NP-7). Viscosity was varied from 1 to 15 mPa·s using poly(ethylene oxide) (POLYOX[trademark] WSR N750). A wetted-wall column was used to verify the kinetics of these systems. Literature model predictions matched the wetted-wall column data within 10%. These models were

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Teixeira, Sandra Maria da Silva. "Bioactive ceramics with high specific surface area for osteoconduction." Tese, 2008. http://hdl.handle.net/10216/12336.

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Teixeira, Sandra Maria da Silva. "Bioactive ceramics with high specific surface area for osteoconduction." Doctoral thesis, 2008. http://hdl.handle.net/10216/12336.

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Wang, Cheng-Hua, and 王誠華. "A study on the preparation hausmannite powder with high specific area surface." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/jecxf2.

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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>97<br>This research focuses mainly on the preparation of haussmannite (Mn3O4) powders with high specific surface area. The whole process comprised of chemical precipitation and oxidation in solution. At first, MnCl2 was recovered by CBM catalyst and reacted with alkaline solution like NH4OH or NaOH. One intermediate product, Mn(OH)2,was formed. If H2O2 was subsequently added into the solution, Mn3O4 powders were obtained from the oxidation of Mn(OH)2. Based on Taguchi method, one L9 orthogonal array was designed and implemented accordingly. A set of relatively p

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Wang, Yu-Xuan, and 王于瑄. "High specific surface area TiO2 microspheres as anodes for Na+ ion battery applications." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/64478216263434784730.

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碩士<br>國立交通大學<br>應用化學系碩博士班<br>104<br>Among the various battery technologies, lithium ion battery (LIB) is quite mature but there were questions regarding increasing prices of Li mineral reserves and disadvantage in a few specific locations. However, sodium is substantially less expensive, more abundant than lithium which let sodium ion batteries have been considered as a desirable alternative to LIB. Among the known materials, TiO2 is regarded as powerful candidates due to the non-toxic, low cost, and small volume change during Na+ ion insertion. In this study, facile route was established to s

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Chang, Yi-Chun, and 張亦諄. "Bio-ingredients assisted formation of high specific surface area TiO2 for Li ion battery applications." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/18541547689444420511.

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博士<br>國立交通大學<br>應用化學系碩博士班<br>103<br>In this study, microspheres (MS), nanosheet spheres (NS), solid spheres with nanosheets (S-NS), channel-like (CT) and spongy-like porous TiO2 (PT) were synthesized with the assistance of the bio-ingredients as templates. We have proposed reaction pathways and the battery performance were also investigated. First, facile route was established to synthesize high specific surface area TiO2 microspheres using basic amino acid (arginine or monosodium glutamate) as the templates. Titanium tetrabutoxide Ti(OBu)4 was used as the TiO2 precursor and absolute ethanol a

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HSU, WEI-HSIN, and 徐偉心. "Preparation and application of high specific surface area activated carbon using phenolic resin as precursor." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/bx2pvp.

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Chang, Chih-Wei, and 張智偉. "Process Development and Reaction Mechanism of High Specific Surface Area and High Alpha-Phase Content Si3N4 Powder." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/87483477121447703692.

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博士<br>國立成功大學<br>化學工程學系碩博士班<br>97<br>A combustion synthesis method for the synthesis of α- Si3N4 from a reactant compact composed of Si, NaN3 and NH4X and wrapped up with an igniting agent was investigated. Wrapping the reactant compact with the igniting agent (i.e., a mixture of Ti and C powders) was found necessary for the synthesis of Si3N4. In addition to NH4Cl, other ammonium halides (i.e., NH4F, NH4Br and NH4I) were found to be capable of catalyzing the synthesis reaction and NaN3 was considered to exert an essential effect on the combustion synthesis reaction other than functioning as

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