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Tesi sul tema "Aggregate Shape"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 12 febbraio 2022

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1

Al, Rousan Taleb Mustafa. "Characterization of aggregate shape properties using a computer automated system." Texas A&M University, 2004. http://hdl.handle.net/1969.1/1485.

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Shape, texture, and angularity are among the properties of aggregates that have a significant effect on the performance of hot-mix asphalt, hydraulic cement concrete, and unbound base and subbase layers. Consequently, there is a need to develop methods that can quantify aggregate shape properties rapidly and accurately. In this study, an improved version of the Aggregate Imaging System (AIMS) was developed to measure the shape characteristics of both fine and coarse aggregates. Improvements were made in the design of the hardware and software components of AIMS to enhance its operational chara

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2

Gatchalian, Dennis. "Characterization of aggregate resistance to degradation in stone matrix asphalt mixtures." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3342.

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Stone matrix asphalt (SMA) mixtures rely on stone-on-stone contacts among particles to resist applied forces and permanent deformation. Aggregates in SMA should resist degradation (fracture and abrasion) under high stresses at the contact points. This study utilizes conventional techniques as well as advanced imaging techniques to evaluate aggregate characteristics and their resistance to degradation. Aggregates from different sources and types with various shape characteristics were used in this study. The Micro-Deval test was used to measure aggregate resistance to abrasion. The aggregate im

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3

McGahan, Jeremy. "The development of correlations between HMA pavement performance and aggregate shape properties." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3351.

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The physical characteristics of aggregates (form, angularity, and texture) are known to affect the performance of hot mix asphalt (HMA) pavements. Efforts to develop relationships between these aggregate characteristics and aggregate performance in HMA pavements have been limited in the past due to inherent inaccuracies in the methods used to measure these characteristics. The recently developed Aggregate Imaging System (AIMS) offers an opportunity to accurately measure aggregate shape characteristics allowing them to be properly related to asphalt performance. This research focused on relatin

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4

Mora, Carlos F. "Particle size and shape analysis of coarse aggregate using digital image processing." Thesis, Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22030153.

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5

Ozen, Murat. "Investigation Of Relationship Between Aggregate Shape Parameters And Concrete Strength Using Imaging Techniques." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608324/index.pdf.

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In this study, relationships between aggregate shape parameters and compressive strength of concrete were investigated using digital image processing and analysis methods. The study was conducted based on three mix design parameters, gradation type, aggregate type and maximum aggregate size, at two levels. A total of 40 cubic concrete specimens were prepared at a constant water-cement ratio. After the compressive strength tests were performed, each specimen was cut into 4 equal pieces in order to obtain the digital images of cross sections using a digital flatbed scanner. A number of aggregate

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6

True, Graham Frank. "Development of image analysis techniques to assist evaluation of both air void structure and aggregate shape factors in concrete." Thesis, University of Wolverhampton, 2011. http://hdl.handle.net/2436/605082.

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Significant reduction in both strength and durability of concrete is brought about by voids left within the concrete once it has hardened. These voids can arise from a number of sources both intentional, in the case of air-entrained voids introduced by admixtures batched to provide a structure that can withstand frost attack and unintentional in the case of entrapped voids that arise due to characteristic of the sand and aggregates, excess water added and a lack of consolidation whilst plastic. Aggregate form, shape and texture are known to influence the way particles pack together and therefo

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7

Breytenbach, Izak Johannes. "A laser-based assessment of road construction aggregate shape and texture properties and their relationship with material shear strength, a pilot study." Thesis, University of Pretoria, 2016. http://hdl.handle.net/2263/53546.

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Experimental research was undertaken to exploit the use of an innovative laser scanning tool and to apply the equipment to the study of (G1) road construction aggregate obtained from crushed rock quarry sources. The aim of the research was to better quantify particle shape and surface texture characteristics and an attempt was made to relate these to the shear strength properties of the materials investigated. By obtaining a better understanding of the effects that particle shape and texture have on the shear strength properties of a material, the overall efficiency of construction aggr

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8

Tolppanen, Pasi. "3-D Characterization and Degradation Analysis of Rock aggregates." Doctoral thesis, Stockholm : Tekniska högsk, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3225.

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9

Li, Ying. "Digital Mix Design for Performance Optimization of Asphalt Mixture." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/72959.

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Asphalt mix design includes the determination of a gradation, asphalt content, other volumetric properties, the evaluation of mechanical properties and moisture damage potentials. In this study, a computational method is developed to aid mix design. Discrete element method (DEM) was used to simulate the formation of skeleton and voids structures of asphalt concrete of different gradations of aggregates. The optimum gradation could be determined by manipulating the particle locations and orientations and placing smaller particles in the voids among larger particles. This method aims at an optim

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10

Koh, Chon Jin. "Characterisation of shape of fine recycled crushed coloured glass and the effect on the properties of structural concrete when used as a fine aggregate replacement." Thesis, University of Wolverhampton, 2014. http://hdl.handle.net/2436/561256.

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In order to reduce the use of landfilling within waste management great emphasis is being placed on waste reduction and recycling. Each year in the UK approximately 2.5 Mt of waste glass is produced and approximately half of this waste is not recyclable. Therefore alternative ways need to be found for using waste glass and one possibility is to use it within concrete as a replacement for cement and/ or aggregate. In the research programme concrete mixes were tested which had 0%, 25%, 50% and 100% of the fine aggregate replaced by crushed waste glass. All glass was originally in bottle form and

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11

Tafesse, Solomon. "Physical properties of coarse particles in till coupled to bedrock composition based on new 3D image analysis method." Licentiate thesis, KTH, Land and Water Resources Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11988.

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<p>The physical properties of the coarse fraction of the till (0.4 to 20 cm) and the surface boulders have been studied at two different sites in Sweden. The research work included: development of a new image analysis software for 3D size and shape measurements of particles; lithological analysis on multiple size fractions in till and magnetic susceptibility survey on coarse till clasts, surface boulders and local bedrock.</p><p>The new 3D image analysis method provides an enormous amount of size and shape data for each particle in the coarse fraction (2 to 20 cm) in till. The method is suitab

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12

Gouveia, Lilian Taís de. "Avaliação do ensaio de angularidade do agregado fino (FAA) da especificação Superpave." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/18/18137/tde-15032004-154355/.

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O desempenho dos pavimentos de concreto asfáltico depende das propriedades e proporções relativas dos seus principais componentes, ou seja, dos agregados minerais, do cimento asfáltico e do volume de vazios. O desempenho das misturas asfálticas de graduação densa é predominantemente influenciado pelas características de forma, angularidade e textura superficial dos agregados finos, que condicionam a estabilidade das misturas. O ensaio de Angularidade do Agregado Fino (FAA), adotado pelo Superpave para avaliar e quantificar a forma, a angularidade e a textura superficial das partículas, tem lev

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13

Cho, Min Ho. "Aggregated Pairwise Classification and Other Applicationsfor Elastic Statistical Shapes." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1595426726818697.

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14

Roberts, Carl. "Spatio-temporal analysis of changes of shape for constituent bodies within biomolecular aggregates." Thesis, University of East Anglia, 2012. https://ueaeprints.uea.ac.uk/40464/.

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Changes of shape are important in many situations of interest in biology at different typical length scales. Approaches for modelling the behaviour of droplets in suspension and thermallydriven motion of the molecular chains in enzymes are presented. Both models use orthogonal basis functions to describe the spatial dependences in a spherical geometry. Both models also describe the effect of time-dependent boundary data on the shape of the bodies involved, a stochastic response for the enzyme model (dimensions of the order 10−9 m) and smooth response for the colloidal model (dimensions of the

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15

Heinson, William Raymond. "Simulation studies on shape and growth kinetics for fractal aggregates in aerosol and colloidal systems." Diss., Kansas State University, 2015. http://hdl.handle.net/2097/19714.

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Doctor of Philosophy<br>Physics<br>Amitabha Chakrabarti<br>The aim of this work is to explore, using computational techniques that simulate the motion and subsequent aggregation of particles in aerosol and colloidal systems, many common but not well studied systems that form fractal clusters. Primarily the focus is on cluster shape and growth kinetics. The structure of clusters made under diffusion limited cluster-cluster aggregation (DLCA) is looked at. More specifically, the shape anisotropy is found to have an inverse relationship on the scaling prefactor "k"_"0" and have no effect on the f

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16

Wang, Qi (Carol). "New equity issues, share repurchases, and the predictability of aggregate stock returns an international perspective /." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/5851.

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Thesis (Ph. D.)--University of Missouri-Columbia, 2006.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on April 29, 2009) Vita. Includes bibliographical references.

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17

Tanner, Allison. "Strength of Masonry Grout Made with Expanded Shale." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/4018.

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Light-weight aggregate has been used successfully for structural and non-structural applications, and its most common use has been in light-weight concrete. Limited research has been done on light-weight grout though and there are no standards in place. The research performed in this study is intended to increase the knowledge of light-weight grout specifically made with expanded shale aggregate. The research presented herein is a pilot study and consists of preliminary aggregate and grout testing that resulted in the mix design of six grout types: three fine grout designs and three coarse gro

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18

Kelly, Brian. "A study of the characteristics of particle shape with particular reference to production and performance of road aggregates." Thesis, University of Ulster, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261049.

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19

Klug, Andrise Buchweitz. "Evaluation of the fatigue performance of fine aggregate matrices prepared with reclaimed asphalt pavements and shale oil residue." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/18/18143/tde-19022018-112755/.

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The incorporation of recycled asphalt pavements (RAP) in the production of new asphalt mixtures is a useful alternative to the use of virgin materials, leading to economic and environmental savings. Pavement recycling created a sustainable cycle of reuse of nonrenewable natural resources, reducing the demand for new mineral aggregate and binder. However, the addition of RAP, especially at higher percentages, increases the stiffness of the asphalt mixture, because of the high stiffness of the aged binder. High stiffness makes the asphalt mixtures more prone to fatigue cracking. In order to over

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20

Nordström, Ylva. "Are tritrophic interactions shaped by plant genotype? A field experiment." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-76682.

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In recent years it has become apparent that when studying plant-herbivore interactions, it is important to also consider the multitrophic context, i.e. to what extent generalist and specialist enemies act as bodyguards for the plant. I have performed a field experiment with 25 genets, varying in plant defense levels, of meadowsweet (Filipendula ulmaria) and its herbivore, the chrysomelid beetle Galerucella tenella. Each genet was treated with four different density manipulations of G. tenella (5, 15, 30, and 60 larvae per genet). The experiment was set up on an archipelago island with natural

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21

Kovačević, Tijana [Verfasser], Heiko [Akademischer Betreuer] Briesen, Heiko [Gutachter] Briesen, and Xue Zhong [Gutachter] Wang. "Crystal Shape Characterization: From Single Crystals to Crystal Aggregates / Tijana Kovačević ; Gutachter: Heiko Briesen, Xue Zhong Wang ; Betreuer: Heiko Briesen." München : Universitätsbibliothek der TU München, 2018. http://d-nb.info/1155923421/34.

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22

Polanco, Hannah Jean. "Structural Lightweight Grout Mixture Design." BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6312.

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This research focused on designing a grout mixture using lightweight aggregate that achieves the minimum 28-day compressive strength required for normal-weight grout, 2000 psi. This research specifically studied the effects of aggregate proportion, slump, and aggregate soaking on the compressive strength of the mixture. The variable ranges investigated were 3-4.75 parts aggregate to cement volumetrically, 8-11 in. slump, and 0 and 2 cycles of soaking. The statistical model developed to analyze the significance of variable effects included a three-way interaction between the explanatory variabl

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23

Oliveira, Ana Isabel Moura Frias de. "O aumento da quota salarial em Portugal : que efeitos?" Master's thesis, Instituto Superior de Economia e Gestão, 2013. http://hdl.handle.net/10400.5/6350.

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Mestrado em Economia<br>Desde o final dos anos 80, a quota salarial tem vindo a diminuir na maioria dos países desenvolvidos. Ao contrário das expectativas neoclássicas e os seus fundamentos teóricos, esta tendência não se tem traduzido em forte crescimento económico nem no aumento do emprego. Estando sob um programa de consolidação orçamental, Portugal enfrenta, há mais de dois anos, uma profunda recessão económica e um empobrecimento generalizado da população. A conjuntura económica, o baixo nível salarial e a elevada desigualdade na distribuição do rendimento exigem, no curto prazo, políti

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24

Bessa, Iuri Sidney. "AvaliaÃÃo do Processamento Digital de Imagens como Ferramenta para CaracterizaÃÃo de Agregados e Misturas AsfÃlticas." Universidade Federal do CearÃ, 2012. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=9583.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>Ã de conhecimento geral que o desempenho de misturas asfÃlticas com relaÃÃo aos principais defeitos do pavimento (deformaÃÃo permanente, trincamento por fadiga e trincamento tÃrmico) estÃ diretamente ligado Ãs propriedades dos agregados que as constituem. A metodologia tradicional de caracterizaÃÃo de agregados, principalmente em relaÃÃo Ã forma, Ã angularidade e Ã textura, pode se tornar dispendiosa e nÃo fornecer resultados precisos, pois, alÃm de muitas vezes combinar mais de uma propriedade em apenas um ensaio, estes parÃmetros

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25

Goel, Ashish. "Dynamic loading of structures by high speed granular media." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/277444.

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This thesis analyses the impact of granular aggregates with structures using experiments and numerical simulations. Original contributions include an insight into multiple factors affecting the loading and damage to the structures, along with study of numerical parameters important for realistic prediction of the interaction between the granular media and structures. It extends the current understanding related to such interactions, with an underlying motivation to guide strategies in order to reduce the structural damage. The response of structures impacted by granular media (sand or soil) is

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26

Arnold, Daiana Cristina Metz. "Análise da influência da forma dos grãos nas propriedades das argamassas." Universidade do Vale do Rio dos Sinos, 2011. http://www.repositorio.jesuita.org.br/handle/UNISINOS/3727.

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Submitted by Mariana Dornelles Vargas (marianadv) on 2015-05-29T17:53:11Z No. of bitstreams: 1 analise_influencia.pdf: 4201896 bytes, checksum: 5bde8b1b65dd35cc811456f73f745be3 (MD5)<br>Made available in DSpace on 2015-05-29T17:53:11Z (GMT). No. of bitstreams: 1 analise_influencia.pdf: 4201896 bytes, checksum: 5bde8b1b65dd35cc811456f73f745be3 (MD5) Previous issue date: 2011-04-29<br>FINEP - Financiadora de Estudos e Projetos<br>UNISINOS - Universidade do Vale do Rio dos Sinos<br>A construção civil é um setor industrial que provoca elevado impacto ambiental, devido ao grande consumo de ma

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27

Lottin, Delphine. "Dimensions fractales, morphologie et caractéristiques dimensionnelles 2D et 3D d'agrégats de nanoparticules de suie aéronautique : Etude par microscopie électronique en transmission et tomographie électronique." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4012/document.

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Les agrégats de suie émis par les processus de combustion dans les turbines aéronautiques contribuent à modifier le bilan radiatif de l'atmosphère et la qualité de l'air. La connaissance de leurs caractéristiques physiques et chimiques est indispensable pour évaluer leur rôle dans les processus physico-chimiques atmosphériques et leur impact sur l'environnement et la santé publique. Dans ce contexte, notre étude vise à déterminer la taille et la morphologie d'agrégats de suie aéronautique à partir de mesures expérimentales menées en microscopie électronique en transmission (MET) et en tomograp

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28

Fernandez, Gonzalez Ramon Francisco. "Avaliação microeconômica do comportamento de investidores frente às alterações de condições de mercado: os determinantes da não racionalidade dos investidores no mercado de fundos brasileiros." reponame:Repositório Institucional do FGV, 2015. http://hdl.handle.net/10438/16495.

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Submitted by Ramon Francisco Fernandez Gonzalez (ragonzalez82@hotmail.com) on 2016-04-29T01:08:08Z No. of bitstreams: 1 Versão Completa - Dissertação Ramon F F Gonzalez - Os determinantes da não racionalidade dos investidores no mercado de fundos brasileiros.pdf: 1256743 bytes, checksum: 8aee8712ff228f642b076f195caf2fce (MD5)<br>Approved for entry into archive by GILSON ROCHA MIRANDA (gilson.miranda@fgv.br) on 2016-05-02T13:22:46Z (GMT) No. of bitstreams: 1 Versão Completa - Dissertação Ramon F F Gonzalez - Os determinantes da não racionalidade dos investidores no mercado de fundos brasilei

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(7860779), Mohammadreza Pouranian. "Aggregate Packing Characteristics of Asphalt Mixtures." Thesis, 2019.

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<p><a>Voids in the mineral aggregate (VMA), as a main volumetric design parameter in the Superpave mixture design method, is an important factor to ensure asphalt mixture durability and rutting performance. Moreover, an asphalt mixture’s aggregate skeleton, related to VMA, is another important factor that affects critical asphalt mixture properties such as durability, workability, permeability, rutting, and cracking resistance. The objective of this study is to evaluate the effects of aggregate size distribution and shape parameters on aggregate packing characteristics (volumetric and compacti

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30

Erdoğan, Sinan Turhan Fowler David W. Garboczi Edward J. "Determination of aggregate shape properties using X-ray tomographic methods and the effect of shape on concrete rheology." 2005. http://repositories.lib.utexas.edu/bitstream/handle/2152/1904/erdogans78599.pdf.

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31

Erdoğan, Sinan Turhan. "Determination of aggregate shape properties using X-ray tomographic methods and the effect of shape on concrete rheology." Thesis, 2005. http://hdl.handle.net/2152/1904.

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32

Mabuse, Madikole Mary. "Laser-based characterisation of aggregate shape properties affecting performance of asphalt mixes." 2015. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001879.

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M. Tech. Civil Engineering<br>Asphalt mixes are commonly used for paving roads around the world. They consist of mainly bitumen and aggregate materials, which may differ depending on the type of asphalt mix. The shape properties of aggregate particles relevant for the performance of asphalt mixes include the form, angularity and surface texture. There are concerns about the standard test methods used to quantify the shape properties (i.e. angularity, surface roughness, flatness, elongation and sphericity) of aggregates used for road pavement design and construction. These test methods have bee

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33

Yang, Tzu-Yao. "Finite Element Studies of an Embryonic Cell Aggregate under Parallel Plate Compression." Thesis, 2008. http://hdl.handle.net/10012/3889.

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Cell shape is important to understanding the mechanics of three-dimensional (3D) cell aggregates. When an aggregate of embryonic cells is compressed between parallel plates, the cell mass and the cells of which it is composed flatten. Over time, the cells typically move past one another and return to their original, spherical shapes, even during sustained compression, although the profile of the aggregate changes little once plate motion stops. Although the surface and interfacial tensions of cells have been attributed to driving these internal movements, measurements of these properties have

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Komba, J. J. (Julius Joseph). "Analytical and laser scanning techniques to determine shape properties of aggregates used in pavements." Diss., 2013. http://hdl.handle.net/2263/32799.

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Pavement layers are constructed using a combination of materials, of which rock aggregates constitute a larger proportion. Current understanding is that the performance of pavements is dependent on the aggregate shape properties which include form, angularity and surface texture. However, direct and accurate measurements of aggregate shape properties remain a challenge. The current standard test methods used to evaluate aggregate shape properties cannot measure these properties accurately. Among the reasons contributing to the difficulties in the determination of aggregate shape properties i

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35

Alqarni, Ali Saeed. "Quantifying the characteristics of fine aggregate using direct and indirect test methods." Thesis, 2013. http://hdl.handle.net/2152/23598.

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The characteristics of fine aggregates, such as shape, angularity, and surface texture, have been shown to influence the performance of concrete and asphalt mixtures and to play an important role in obtaining valuable properties of early age concrete such as workability, and compatibility. However, the measurement of fine aggregate characteristics is not easy. In the present study, 26 fine aggregates, covering a wide spectrum of mineralogy, were examined using direct and indirect test methods in order to evaluate the shape, angularity, and surface texture, as well as to analyze the gradation.

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Ko, Ya-Ping, and 柯雅萍. "Applying the aggregate market share model to investigate airlines’ competition." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/ynkxda.

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碩士<br>國立臺中科技大學<br>流通管理系碩士班<br>103<br>With the globalization of commercial activity, the relationship among airports or airlines is existence of competition perspective. Hence, this study attempts to investigate the airlines’ competition for airport-pairs flight. The empirical study focused on two departure airports: Taoyuan airport and Songshan airport, which are composing of Northeast Asia Golden Aviation Circle. The major purpose is to predict the passenger demand and market share of airlines. The regression model and multinomial logit model were used to modeling the aggregate market share m

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Luo, Wen-Yi, and 羅文義. "Stock Investing Using Market-share Estimation Based on Aggregate Data." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/vb3ub2.

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碩士<br>國立臺灣大學<br>商學研究所<br>107<br>This study aimed to discuss the utility of investors when investors buy stocks in the stock market under the BLP framework. We applied a Bayesian approach to analyze different stocks based on the aggregate level historical trading data in the Taiwan Stock Exchange. This Bayesian analysis method was based on the algorithm in Jiang, Manchanda and Rossi (2009) and the multinomial logit model for aggregated data with random coefficients - the so-called BLP model, named for Berry, Levinsohn and Pakes (1995). This study mainly focused on the constituent stocks in Yuan

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Krutilová, Kateřina. "Vliv složení a mikrostruktury vulkanických hornin na jejich technologické vlastnosti." Doctoral thesis, 2015. http://www.nusl.cz/ntk/nusl-349325.

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Because of a very variable geological composition of the Czech Republic, there is a various scale of all genetic types of rocks that are used for the production of crushed stone. The most often used group of rocks are effusive magmatic rocks, which represent about 34 % of crushed stone marketed (Starý et al. 2010). These rocks are used for all kinds of construction purposes including roads. The experimental material of crushed stone used in this thesis was sampled from 40 active quarries in the Czech Republic. The studied volcanic rocks originated from Neoproterozoic and Paleozoic complexes of

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Peng, Shu-Ya, and 彭書亞. "The Effect of Firm-Level Attributes Using Market-Share Estimation Based on Aggregate Data." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/zb4tvf.

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碩士<br>國立臺灣大學<br>商學研究所<br>107<br>This study explores the impact of different firm-level variables on the consumer utility and market share. We introduce the BLP model to analyze the consumers utility and further convert them into market share. And then, we select firms and variables from the dataset to conduct the empirical study. We modify the BLP model due to encountering the problem of parameter divergence. After modification, we obtain precise prediction and discover that product margin is the key factor to influence the market share of a firm.

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Mechleb, Ghadi. "The effect of expanded shale lightweight aggregates on the hydraulic drainage properties of clays." 2013. http://hdl.handle.net/2152/21933.

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Abstract (sommario):

Fine grained soils, in particular clays of high plasticity, are known to have very low values of hydraulic conductivity. This low permeability causes several problems related to vegetation growth and stormwater runoff. One way to improve the permeability of clay soils is by using coarse aggregates as a fill material. Recently, Expanded Shale has been widely applied as an amendment to improve drainage properties of clayey soils. However, limited effort has been made to quantify the effect of Expanded Shale on the hydraulic conductivity or on the volume change of fine grained soils. Specifically

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41

Elshandidy, Tamer, I. Fraser, and K. Hussainey. "Aggregated, voluntary and mandatory risk disclosure incentives: Evidence from UK FTSE all Share companies." 2013. http://hdl.handle.net/10454/12861.

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no<br>This paper investigates the impact of corporate risk levels on aggregated, voluntary and mandatory risk disclosures in the annual report narratives of UK non-financial listed companies. We find that firms characterised by higher levels of systematic, financing risks and risk-adjusted returns and those with lower levels of stock return variability are likely to exhibit significantly higher levels of aggregated and voluntary risk disclosures. The results also show that firms of large size, high dividend-yield, high board independence, low (high) insider (outsider) ownership, and effective

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42

(5930972), Chen Hsuan Chiu. "Screening of Microorganisms, Calcium Sources, and Protective Materials for Self-healing Concrete." Thesis, 2019.

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Abstract (sommario):

<p>To make bacterial-based self-healing concrete, alkaline-resistant bacterial spores, nutrient sources, and a calcium source are incorporated into a concrete matrix. Two ureolytic spore-forming bacteria, <i>Sporosarcina pasteurii</i>, <i>Lysinibacillus sphaericus</i>, and two non-ureolytic spore-forming bacteria, <i>Bacillus cohnii</i>, and <i>Bacillus pseudofirmus</i>, which have been used in previous studies as bacterial concrete healing agents, were compared in this study. The four bacteria were compared for their (1) sporulation rates on different sporulation agar plates, (2) growth in fi

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