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Dissertations / Theses on the topic 'Air and Hydraulic Lime'

Author: Grafiati

Published: 18 April 2022

Last updated: 30 July 2025

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1

Lawrence, Robert Michael Heathcote. "A study of carbonation in non-hydraulic lime mortars." Thesis, University of Bath, 2006. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438646.

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Lime has been used in construction for millennia, and its value, especially in the field of conservation architecture, has only recently been rediscovered. Lime mortars harden through carbonation, and this thesis is a study of that process. The research conducted has resulted in the development of two novel techniques for the measurement and detection of carbonation. The first technique is a method of thermogravimetric analysis which allows the carbonation profile to be measured within an acceptable time-frame. The second technique is the use of drilling resistance measurement to visualise the

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2

Skoupil, Jakub. "Vliv etherů celulózy na vlastnosti hydraulického vápna." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-392357.

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This diploma thesis deals with the study of the influence of cellulose ethers on the properties of hydraulic lime mortars. The availability and price of cellulose ethers in the industrial market is very favorable, but we can´t meet with studies using cellulose ethers in building materials, where lime is used as a binder. Cellulose ethers are commonly used as thickening agents in cement-based materials. The purpose of this diploma thesis is to review if cellulose ethers are appropriate for use in hydraulic lime mortars, either as water retention agents that contribute by water retention to bett

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3

Pingarrón, Alvarez Victoria I. "Performance analysis of hydraulic lime grouts for masonry repair." Connect to PDF file, 2006. http://repository.upenn.edu/cgi/viewcontent.cgi?article=1013&context=hp_theses.

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4

Zhou, Zhaoxia. "Development of bond strength in hydraulic lime mortared brickwork." Thesis, University of Bath, 2012. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.550613.

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The first recorded use of hydraulic lime in construction can be traced back to at least two thousand years ago. Hydraulic lime, produced through either adding pozzolanic materials or calcining clay containing limestone, unlike air lime, can set and harden under water, developing strength through initial hydration reaction and subsequent carbonation. After WWII Portland cement mortars had almost completely replaced lime based mortars in modern construction. However, through conservation and specialist construction the benefits of hydraulic lime are becoming increasingly recognised. To support w

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5

Baltazar, Luís Gonçalo Correia. "Rheology of natural hydraulic lime grouts for masonry consolidation." Doctoral thesis, Faculdade de Ciências e Tecnologia, 2014. http://hdl.handle.net/10362/13139.

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6

Zawawi, Rodiah. "Artificial hydraulic lime mortar obtained by calcining limestone and siliceous waste materials." Thesis, Heriot-Watt University, 2010. http://hdl.handle.net/10399/2411.

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This study was carried out to produce an artificial hydraulic lime for the repair and conservation of historic masonry. Hydraulic lime mortar is preferred to cement mortar and pure lime mortar for conservation work because it can set and harden in wet condition as well as allowing the old wall to breathe. These characteristics create a repaired mortar which is compatible with natural stone and ancient brickwork, as well as being a more sustainable material. The study focused on the properties of an artificial hydraulic lime mortar obtained by burning a binary mixture of limestone and siliceous

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7

Altamirano-Soto, Pablo, Jorge Supa-Urrutia, Humbero Pehovaz-Alvarez, Carlos Raymundo, Nestor Mamani-Macedo, and Francisco Dominguez. "Filling Method Implementing Hydraulic Lime for Reusing Mine Tailings and Improve Sustainability in Conventional Peruvian Underground Mines." Springer, 2020. http://hdl.handle.net/10757/656169.

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El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado.<br>Mining in Peru has existed for several decades, and for several years, there has been no proper environmental management of the impact of this activity on the environment and society in general, whether it be gas emissions, the presence of acidic water, or the generation of mining tailings. One of the most prominent examples involve mine tailings; these are by-products of mining processing plants and are stored in a dam known as a tailings dam.

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8

Samari, Mohammad. "CO2 Capture from Dilute Sources via Lime-Based Sorbents." Thèse, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/30978.

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Direct capture of CO2 from ambient air is a developing technology, which is capable of removing CO2 directly from the atmosphere. Moreover, this technology is independent from sources of CO2 emissions. Hence, it can be set up at locations where pure stream of CO2 is needed such as in enhanced oil recovery. In this research, the performance of pelletized and natural limestone for CO2 capture from air in a fixed bed is studied. To compare the performance of sorbents for air capture, the effects of particle type (natural limestone and pelletized limestone), particle size (250-425 µm and 425-600 µ

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9

Longhitano, Marco, Alessandro Protase, and Hubertus Murrenhoff. "Experimental Investigation of the Air Release in Hydraulic Reservoirs." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-199943.

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Air contamination strongly decreases the efficiency of fluid power systems and when the allowable limits are exceeded, the performance of the system deteriorates. The hydraulic reservoir performs the function of releasing the entrained air of the hydraulic system to the surroundings. In recent years, the reservoir design has become an important task in the design of the hydraulic system due to space restrictions forcing the use of small sized reservoirs. Despite this fact, experimental results on an air release are not available. In this paper, an experimental investigation of the air release

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10

Corteline, Carlos Henrique. "On the air in servo valve hydraulic control systems." Instituto Tecnológico de Aeronáutica, 2009. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=1256.

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The present work is a study of the effects of air in hydraulic control system. The study is based on models of: the mixture of air with hydraulic fluid, the servo hydraulic control system and experimental identification. The air mixture model is to evaluate the impact on the fluid properties, the hydraulic system';s one is to assess the impact of changes in the fluid properties in the system performance and identification to estimate the amount of air in the system.

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11

Longhitano, Marco [Verfasser]. "On the Air Release in Hydraulic Reservoirs / Marco Longhitano." Düren : Shaker, 2019. http://d-nb.info/1208599445/34.

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12

Adal, Birand. "Use Of Air Chambers Against Waterhammer In Penstocks." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613520/index.pdf.

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All pipeline systems are susceptible to water hammer that can cripple critical infrastructure. One effective method to relieve excessive waterhammer pressures in pipelines is to use air chambers. This study aims to develop an empirical procedure for the quick analysis of penstock-turbine systems to determine dimensions and operating conditions of air-chambers that can effectively diminish the transient phenomena after sudden changes of flow rate in the system. A numerical study has been carried out by obtaining repeated solutions for variable system parameters using a commercial software. The

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13

Abou-Arab, A. A. A. "Some effects of trapped air in wet soils." Thesis, University of Aberdeen, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378082.

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The effects of air trapped in soils at zero or small negative values of matric potential were studied in relation to saturated and unsaturated hydraulic conductivity, the water release characteristic, and root growth. A reliable method was developed for measuring the trapped air porosity of 'saturated' soils. Using this method, the surface layer of three soils of contrasting texture, in a relatively undisturbed state, was found to have similar amounts of trapped air (5 to 7% of total soil volulme). After digging, the amount of air trapped by ponding water on the surface increased to a value of

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14

Razali, Nadia Binti. "Natural hydraulic lime mortars for use in high temperature, high humidity climatic conditions : effect of calcitic fillers." Thesis, Heriot-Watt University, 2014. http://hdl.handle.net/10399/2731.

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The widespread adoption of alternative binders are playing an increasing role in carbon dioxide (CO2) abatement in green construction and the repair of traditionally built structures. Natural Hydraulic Lime (NHL) has better environmental credentials than Portland Cement (PC) due in part to its lower calcination temperature and its ability to absorb CO2 during carbonation. However, NHL is more sensitive to climatic conditions during the setting and hardening processes and this is especially pronounced in high humidity climates. This research investigated the influence of various types of calcit

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15

Mortensen, Joshua D. "Factors Affecting Air Entrainment of Hydraulic Jumps within Closed Conduits." DigitalCommons@USU, 2009. https://digitalcommons.usu.edu/etd/531.

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While there has been a great deal of research on air entrainment at hydraulic jumps within closed conduits, very little of the research has specifically addressed size and temperature scale effects. Influences from jump location and changing length characteristics on air entrainment have also received little attention from past research. To determine the significance of size-scale effects of air entrained by hydraulic jumps in closed conduits, air flow measurements were taken in four different-sized circular pipe models with similar Froude numbers. Each of the pipe models sloped downward an

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16

Vinagre, Ana Isabel Baltazar. "Estudo comparativo entre argamassas de cal calcítica e de cal dolomítica: caracteristicas mecânicas, físicas, mineraloógicas e microestruturais." Master's thesis, Universidade de Évora, 2015. http://hdl.handle.net/10174/17937.

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São apresentados e discutidos os resultados de um estudo comparativo entre argamassas de cal aérea calcítica e dolomítica, com o objetivo de avaliar a influência da natureza e teor em ligante nas características mecânicas, físicas, mineralógicas e microestruturais, ao longo do tempo. Os resultados mostraram que as argamassas de cal dolomítica, comparativamente às de cal calcítica, apresentam resistências mais elevadas e têm um melhor comportamento à água. Verificou-se existir uma relação positiva entre o teor em ligante e as resistências mecânicas e à água. O processo de carbonatação, que infl

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17

Pesce, Gianluca. "Study of carbonation in novel lime based materials." Thesis, University of Bath, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.629662.

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This research advances the current understanding of the carbonation reaction in porous materials by investigating pH changes during the hardening process of lime, the role of pore-water in the dissolution process of calcium hydroxide and the effects of pore size on precipitation of calcium carbonate solid phases. To achieve this, carbonation is studied within a thin film of an aqueous solution of calcium hydroxide, that simulates the conditions existing in porous media once most of the liquid water has evaporated. The research introduces novel approaches such as the use of specially manufactur

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18

Figueiredo, Cristiano. "Properties and performance of lime mortars for conservation : the role of binder chemistry and curing regime." Thesis, University of Bath, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760987.

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The selection of mortar for conservation of historic and heritage buildings can be challenging. Achieving compatibility with the historic fabric, durability and efficient use of materials within a practical timeframe often requires the use of hydraulic lime-based mortars which set more rapidly than the more traditional air lime mortars. These are considered to be more compatible with historic fabric than cement-based mortars, although, due to the modern production techniques and their natural variability, a deeper knowledge of their chemical and physical properties is needed to minimise damage

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19

Chief, Karletta. "Soil Air Permeability and Saturated Hydraulic Conductivity: Development of Soil Corer Air Permeameter, Post-fire Soil Physical Changes, and 3D Air Flow Model in Anisotropic Soils." Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/195482.

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Air permeability (ka) is a viable alternative to water- and texture-based methods to rapidly map saturated hydraulic conductivity (Ksat). The ability to measure this important hydraulic property without the use of more cumbersome and time-consuming methods may provide a practical approach to generate more complete data to describe hydrologic conditions. This study presents the development of an air permeameter which is suitable for desert soils. The Soil Corer Air Permeameter (SCAP) is compatible with a standard soil corer and employs digital components to measure flowrates under low-pressur

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20

Boström, Dan. "Hydrauliskt kalkbruk : Komparativ studie av bindemedlets inverkan på murverkets egenskaper." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-172665.

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Hydrauliskt kalk är ett bindemedel i mur- och putsbruk som idag främst används vid restaureringar. Likt bruk med cement som bindemedel härdar hydrauliskt kalkbruk även under vatten. Hydrauliskt kalkbruk når en högre hållfasthet än luftkalkbruk men lägre än cementbruk. Enligt EU:s avfallsdirektiv ska återanvändning eller materialåtervinning ske av merparten av icke-farligt avfall en avfallsgrupp till vilket tegel och murbruk hör. Likt luftkalkbruk kan tegel murat med hydrauliskt kalkbruk rensas från bruket och sedan återbrukas i nyproduktion. Denna möjlighet tillsammans med god hållfasthet och

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21

Dombek, Priscilla Emily 1961. "IMPROVING THE CONVERSION OF THE SULFUR DIOXIDE - LIME REACTION BY USING ADDITIVES." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/291523.

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22

Opravil, Tomáš. "Příprava a vlastnosti románského cementu." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2009. http://www.nusl.cz/ntk/nusl-233293.

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The Ph.D. thesis deals with the preparation of highly hydraulic binders based on roman cement. Roman cement (natural cement) is recently not available on the market due to uneconomic production of such a specific binder. On the other hand there is a big lack of information on this hydraulic binder. These results in failure in meeting the basic principle of modern approaches to restoration of historical buildings or monuments made of such kind of materials, which is such, that the materials used for restoration should be compatible with original material. Recognition of the processes of roman c

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23

Bayón, Barrachina Arnau. "Numerical analysis of air-water flows in hydraulic structures using computational fluid dynamics (CFD)." Doctoral thesis, Universitat Politècnica de València, 2018. http://hdl.handle.net/10251/90440.

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The new legal regulations derived from climate change dictate that hydraulic structures must be designed to handle flood events associated with return periods up to 10,000 years. This obviously involves adapting the existing infrastructure to meet such requirements. In order to avoid risks in the restitution of the flow discharged to rivers, such as bank overflows or streambed erosion and scour processes, hydraulic design must be supported by reliable tools capable of reproducing the behavior of hydraulic structures. In the work presented herein, a fully three-dimensional CFD model to reproduc

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24

Himmo, S. K. M. "The behaviour of air pockets in hydraulic structures with particular reference to dropshaft/tunnel bends." Thesis, University of Glasgow, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.483102.

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25

Benetti, Mozara. "Comportamento hidráulico e mecânico de um solo residual tratado com cal." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/127889.

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A abordagem do comportamento hidráulico associado ao comportamento mecânico de um material é de extrema importância. A técnica de tratamento de solos com cal vem sendo empregada com sucesso na engenharia geotécnica, melhorando as características do solo, que por ser um material complexo e variável nem sempre satisfaz as necessidades requeridas para um projeto. Nesse sentido, este estudo tem por objetivo quantificar a influência da quantidade de cal e da porosidade sobre o comportamento hidráulico e mecânico de um solo residual tratado com cal, verificando a adequação do uso da relação vazios/c

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26

Pradhan, Suman. "Measurement of bubble velocity vectors in bubbly air water multiphase flow." Thesis, University of Huddersfield, 2010. http://eprints.hud.ac.uk/id/eprint/9247/.

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Measurement of the volumetric flow rate of each of the flowing components in multiphase flow is often required and this is particularly true in Production Logging applications. Thus, an increasing level of interest has been shown in making flow rate measurements in multiphase flow. A new generation of tomographic instrument, which enables measurement of the instantaneous local velocity vector and the instantaneous local volume fraction of the dispersed phase, is now being introduced. However validation and calibration of such instruments is necessary. This thesis describes the development of a

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27

Arizcun, Zúñiga Paula María. "Ram pump hydraulic air test. Pressure conditions and flow measurements: Experimental research and case study." Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-26897.

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This study consists of the development of a ram pump, which will allow the pumping of water without the need of external energy sources. It is considered an analysis of interest since, once it is finished; it can be applied in reality improving and facilitating different activities related to agriculture and health. Previous studies have been made related to the ram pump; however, in this case, it is intended to understand the system that has been built in the laboratory in order to find the best combination of parameters that will lead to obtain the highest possible efficiency. The study wil

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28

Fagan, Tony Duane. "Effect of membrane weight on vibrations of air-inflated dams." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/91167.

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Inflatable dams are flexible membrane structures, pressurized with either air, water, or both, which have been used in recent years as a means of temporarily impounding water. A number of procedures have been developed to investigate the static behavior of the dams, but the dynamic behavior has been largely neglected. The few studies that have been done on dynamic behavior have used the simplifying assumption that the weight of the membrane was negligible. In this study, equations of equilibrium and equations of motion were derived for an air inflated dam impounding no water, but loaded with

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29

Sonelin, Sarah. "Effekter av luftföroreningar på lavar och grönalger på lind i Norrköpings kommun." Thesis, Linköpings universitet, Biologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-79072.

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Syftet med denna studie var att undersöka vilka effekter luftföroreringar har på lavar och grönalger som växer på lindar, genom att jämföra lavfloran i urban miljö och i landsbygdsmiljö. Mer specifikt var syftet att utreda hur avstånd till närmaste väg, trafikintensitet och trädets exponerade respektive icke-exponerade sida gentemot en väg påverkar lavfloran i urban miljö. 18 utvalda lavarter samt grönalger eftersöktes på 86 lindar i urban miljö och 37 i landsbygdsmiljö inom Norrköpings kommun. Resultaten visade att artantalet, samt förekomsten och täckningsgraden för flertalet lavar var störr

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30

Vollmer, Thees, and Ludger Frerichs. "Development of hydraulic tanks by multi-phase CFD simulation." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-199968.

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Hydraulic tanks have a variety of different tasks. The have to store the volume of oil needed for asymmetric actors in the system as well as to supply the system with preconditioned oil. This includes the deaeration as air contamination is affecting the overall system performance. The separation of the air in the tank is being realized mainly by passive methods, improving the guidance of the air and oil flow. The use of CFD models to improve the design of hydraulic tank is recently often discussed. In this paper, a design method for hydraulic tanks using CFD is presented and discussed. First t

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31

Psanis, Christodoulos. "Modelling and experimentation on air hybrid engine concepts for automotive applications." Thesis, Brunel University, 2007. http://bura.brunel.ac.uk/handle/2438/3218.

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Hybrid powertrains that use compressed air to help power a vehicle could dramatically improve the fuel economy, particularly in cities and urban areas where the traffic conditions involve a lot of starts and stops. In such conditions, a large amount of fuel is needed to accelerate the vehicle, and much of this is converted to heat in brake friction during decelerations. Capturing, storing and reusing this braking energy to produce additional power can therefore improve fuel efficiency. In this study, three approaches towards air hybrid powertrains are proposed and analyzed. In the first approa

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32

Grant, Ryan James. "Community based air quality monitoring near proppant sand facilities." Thesis, University of Iowa, 2015. https://ir.uiowa.edu/etd/1846.

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Silica sand is used in the hydraulic fracturing process as a proppant—a material that holds open fissures in a rock formation to allow oil and gas to escape. Due to the increased demand for proppant sand, numerous sand mining and processing facilities have been constructed in the vicinity of small communities. Silica sand contains crystalline silica, which can cause chronic health problems such as silicosis. This study monitored airborne particulate matter at residences within 800 m from the facilities property line, with active mining, processing, and/or transport. Real-time particulate air m

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33

Švec, Jiří. "Možnosti využití odkalů po vypírce vápence." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2011. http://www.nusl.cz/ntk/nusl-216744.

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In modern point of view of waste management is desirable to effectively process the grates possible amount of wastes. Sediments from cleaning of mined lime stones contains a lot of clay components, but there is also indispensable share of soft calcite. This composition makes these sediments a promising material for preparation of hydraulic binders. Production of common hydraulic binders, especially Portland cement, is very energy-intensive plus loads environment with considerable amount of combustion gases, therefore it is necessary to explore possibilities of alternative low - energy binders

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34

Bajwa, Tariq Mahmood. "Experimental Characterization of the Thermal, Hydraulic and Mechanical (THM) Properties of Compost Based Landfill Covers." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/20518.

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Landfills are considered to be one of the major sources of anthropogenic methane (CH4) emissions in the environment. A landfill biocover system optimizes environmental conditions for biotic CH4 consumption that controls the fugitive and residual emissions from landfills. A compost material has more oxidation potential in comparison to any other material due to its high porosity, organic content, free flux for gases and water holding capacity. Thermal, hydraulic, bio – chemical and mechanical (THMCB) properties are important factors that can significantly affect the performance of biocover mat

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35

Wright, Nathan W. "Air Vent Sizing in Low-Level Outlet Works for Small- to Medium-Sized Dams." DigitalCommons@USU, 2013. http://digitalcommons.usu.edu/etd/1531.

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The majority of dams contain low-level outlet works, which typically consist of closed conduits that run through the dam, and are used to release water from the reservoir when the water level is below the level of the surface spillways. It is also used to flush the reservoir of sediments and to control the elevation of the reservoir. Low-level outlet works typically consist of a gate that controls the flow within a closed conduit that runs through the dam and an air vent that supplies air behind the gate. In the absence of properly designed air vents, negative pressures may develop downstream

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36

Zeng, Xianwu. "Improving the Energy Density of Hydraulic Hybrid Vehicle (HHVs) and Evaluating Plug-In HHVs." University of Toledo / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1239319863.

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37

Marsh, Richard. "Experimental analysis of oil based cavitation peening in air." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/43602.

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Oil Jet Cavitation Peening in Air (OPA) is capable of inducing compressive residual stress in standard aerospace materials. This paper demonstrates the process capabilities of OPA on Al 2024-T3. Specifically, changes in the workpiece residual stress, microhardness, mass loss and surface roughness are investigated as a function of the control parameters for the system. Additionally, the paper identifies a method to monitor the process in situ through the use of high frequency acoustic emission sensors. The results indicate the OPA process is capable of generating residual stresses comparable t

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38

Ramalingam, Dhandayudhapani. "DESIGN AIDS FOR AIR VESSELS FOR TRANSIENT PROTECTION OF LARGE PIPE NETWORKS - A FRAMEWORK BASED ON PARAMETERIZATION OF KNOWLEDGE-BASE DERIVED FROM OPTIMIZED NETWORK MODELS." UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_diss/489.

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The need for optimal air vessel sizing tools, in protecting large pipe networks from undue transient pressures is well known. Graphical and other heuristic methods reported in literature are limited to sizing the air vessels for simple rising mains. Although attempts have been made to utilize optimization techniques, they have been largely unsuccessful due to their impractical computational requirements. This research work proposes a robust framework for developing surge protection design tools and demonstrates the usefulness of the framework through an example air vessel sizing tool. Efficien

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39

Lim, Guo Quan. "Evaluation of the Influence of Non-Conventional Sources of Emissions on Ambient Air Pollutant Concentrations in North Texas." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc804841/.

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Emissions of air pollutants from non-conventional sources have been on the rise in the North Texas area over the past decade. These include primary pollutants such as volatile organic compound (VOC) and oxides of nitrogen (NOx) which also act as precursors in the formation of ozone. Most of these have been attributed to a significant increase in oil and gas production activities since 2000 within the Barnett Shale region adjacent to the Dallas-Fort Worth metroplex region. In this study, air quality concentrations measured at the Denton Airport and Dallas Hinton monitoring sites operated by t

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40

Dohde, Farhan A. "Estimation of Air Emissions During Production Phase from Active Oil and Gas Wells in the Barnett Shale Basin: 2010-2013." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc799523/.

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The Barnett shale basin, the largest onshore gas field in the state of Texas, mainly produces natural gas. The basin’s oil and gas productions have dramatically increased over the past two decades with the enhancement via shale fracturing (fracking) technology. However, recent studies suggest that air emissions from shale fracking have significantly contributed to the growing air pollution problem in North Texas. In this study, air emissions from the Barnett shale basin during the production phase of the oil and gas activities (once the product is collected from the wells) are quantified. Oil

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Hedrich, Philipp, Maik Johe, and Peter F. Pelz. "Design and Realization of an Adjustable Fluid Powered Piston for an Active Air Spring." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-199924.

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In this paper, we present a new compact hydraulic linear actuator. The concept is developed to change the rolling piston diameter of an active air spring during usage. By doing so, the air spring can actively apply pressure and tension forces. The actuator is designed for small movements at high forces. It is insensitive to side forces, which are introduced by the bellows rolling on the rolling piston of the air spring. A diaphragm sealing is used to minimize friction. Hence a precise adjustment of small displacements at high dynamics is possible and the system is completely leakage-free. We d

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Fernandes, Rita. "Efficient Volvo Bus Cooling System,Using Electrical Fans : A comparison between hydraulic and electrical fans." Thesis, KTH, Kraft- och värmeteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-155901.

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Economical and environmental factors together with energy policies towards more efficient systemsare the driving force for the development of the vehicle industry. Significant changes have beenmade to fulfill new emissions legislation but the basic internal combustion vehicle architecture hasbeen kept. New emission treatment systems that increase the thermal loading of the cooling systemhad been added within the same package envelope as before, which means less space to place coolingfans and a greater need for airflow. Changes in the cooling system, namely the replacement of thehydraulic fan d

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Rizzo, Rodrigo Pelho [UNESP]. "Avaliação da eficácia de barreiras de proteção ambiental produzidas com solo arenoso estabilizado quimicamente." Universidade Estadual Paulista (UNESP), 2004. http://hdl.handle.net/11449/90738.

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Made available in DSpace on 2014-06-11T19:24:45Z (GMT). No. of bitstreams: 0 Previous issue date: 2004-02-26Bitstream added on 2014-06-13T18:21:09Z : No. of bitstreams: 1 rizzo_rp_me_ilha.pdf: 2484817 bytes, checksum: d447a4c31b21a9373e9067be45abcaad (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>As barreiras de proteção ambiental são os dispositivos mais usados na atualidade para reduzir riscos associados à infiltração de fluidos nocivos no subsolo. O presente trabalho dedicou-se ao estudo, em

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Salzman-Gubbay, Gideon J. "Earth, Air, Water, Oil: Regulating Fracking in the Monterey Shale with Health and Environment in Mind." Scholarship @ Claremont, 2014. http://scholarship.claremont.edu/pomona_theses/112.

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“Earth, Air, Water, Oil: Regulating Fracking in the Monterey Shale with Health and Environment in Mind,” explores how hydraulic fracturing regulation in California’s oil-rich Monterey Shale will impact regional public health, including groundwater and air quality. This is achieved through a combination of case study and policy analysis on both the state and national level.

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Barbosa, JoÃo Marcelo Costa. "Computational modeling of hydraulic transients in the triple function of suction cups and non slam considering the curves admission and expulsion of air." Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=16144.

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A ventosa de trÃplice funÃÃo atua na admissÃo e/ou expulsÃo de ar contido na tubulaÃÃo, protegendo tubulaÃÃo e equipamentos contra os efeitos decorrentes do acÃmulo de ar e golpe de arÃete. AtravÃs do orifÃcio cinÃtico, ela admite grande quantidade de ar quando a pressÃo no interior da tubulaÃÃo torna-se inferior Ã atmosfÃrica, e expulsa ar apÃs a separaÃÃo da coluna a uma pressÃo superior Ã atmosfÃrica. Na regiÃo de admissÃo de ar, a ventosa com orifÃcio âNon Slamâ admite grande volume de ar atravÃs do orifÃcio cinÃtico, e inicia a expulsÃo de ar, atravÃs do mesmo orifÃcio. A partir de um det

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Ibeiro, Lidiane da Silva. "Estudo da distribuição dimensional de poros e da condutividade hidráulica de solos arenosos compactados tratados com cal e cimento." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/153307.

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A técnica de estabilização de solos através da incorporação de agentes cimentantes é uma opção eficaz e amplamente utilizada em obras de engenharia geotécnica. Portanto, são relevantes os estudos que contemplam aspectos ainda não bem compreendidos relativos aos efeitos causados pela adição de agentes cimentantes na porosidade dos materiais obtidos e, por consequência, nas propriedades de desempenho destas misturas. Neste sentido, o presente trabalho pretende contribuir no que tange ao conhecimento da estrutura de poros de solos compactados tratados com cal e cimento e sua relação com o comport

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Rosa, Henrique Marcio Pereira. "Nova solução para o problema da dissolução de ar em reservatório hidropneumático." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/3/3147/tde-12082010-113044/.

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Este trabalho se propõe a apresentar uma nova solução para o problema da dissolução de ar em reservatório hidropneumático. No capítulo introdutório são apresentadas informações e características sobre reservatório hidropneumático, sobretudo relacionadas ao seu funcionamento. Neste capítulo comenta-se sobre as principais soluções utilizadas para superar o problema da dissolução de ar. No segundo capítulo enumeram-se com detalhes os objetivos do trabalho. Na revisão da literatura são apresentadas diversas referências, relativas aos estudos do regime transitório e do comportamento do reservatório

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Magalhães, Carlos Augusto de Carvalho. "Estudo analítico e experimental dos fenômenos transitórios ocasionados por grandes bolsas de ar confinadas nos sistemas hidráulicos." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-11112015-123205/.

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Uma das características dos transitórios hidráulicos é a presença de ar aprisionado durante a ocorrência do fenômeno. Se uma tabulação não estiver satisfatorimente projetada ou não for adequadamente cheia e purgada, grandes quantidades de ar poderão ficar aprisionadas. Caso esses bolsões se desloquem de um local para o outro, proporcionarão acelerações locais que resultam em altas velocidades e, subsequentemente, em altas pressões transitórias. As sobrepressões geradas podem ser de 2,2 vezes maiores que a pressão estática dos sistema, conforme verificou-se no estudo experimental. Dessa forma,

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Eriksson, Daniel. "Numerical models for degradation of concrete in hydraulic structures due to long-term contact with water." Licentiate thesis, KTH, Betongbyggnad, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-225125.

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The durability of concrete is of major concern in all types of concrete structures where the combined effect of exposure conditions and the type and quality of the concrete material usually determines the rate of degradation. Furthermore, there are synergy effects between different deterioration mechanisms, which means that the combined rate of degradation is higher than the sum of the individual rates of each mechanism. Therefore, to accurately predict the residual service life of existing structures or when designing new structures, it is essential to consider all these aspects. This means t

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Antón, Remírez Raúl. "Experimental and numerical study of the thermal and hydraulic effect of EMC screens in radio base stations : detailed and compact models." Doctoral thesis, KTH, Energiteknik, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4265.

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Today’s telecommunication cabinets use Electro Magnetic Compliance (EMC) screens in order to reduce electromagnetic noise that can cause some miss functions in electronic equipment. Many radio base stations (RBSs) use a 90-degree building architecture: the flow inlet is perpendicular to the EMC screen, which creates a complex flow, with a 90-degree air turn, expansions, compressions, perforated plates and PCBs. It is of great interest to study how the EMC screen interacts with the rest of components and analyze the total pressure drop and how much the flow pattern changes due to the placement

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