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Dissertations / Theses on the topic 'SDA’s'

Author: Grafiati

Published: 7 July 2024

Last updated: 31 July 2025

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1

Fayek, Jawad. "Synthesis of Structure Determining Agents (SDAs) for zeolites with extra-large pore size." Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMC201.

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Les zéolites sont des matériaux poreux cristallins uniformesformés d'unités TO4 partageant un sommet (T = Si, Al, Ge, etc.). Ils sont préparés sous des conditions hydrothermales, en mélangeant un agent directeur de structure (SDA) approprié avec un gel contenant des composants inorganiques tels que la silice, l'alumine ou le germanium. À un pH et une température spécifiques, le SDA induit la nucléation et la croissance cristalline pour obtenir des zéolites de taille, de forme et de dimension spécifiques. Les zéolites à pores de taille extra-large avec une ouverture de pore supérieure à 0,75 nm

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2

Imtiaz, Muhammad. "NEW INTEGRATED SDARS ANTENNA ELEMENT FOR AUTOMOTIVE APPLICATIONS." Thesis, Högskolan i Gävle, Akademin för teknik och miljö, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-10422.

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In the past few years the demand for light weight compact automotive antennas in the customersdesired mounting position has brought a challenge for the automotive antenna developers. Due to thehigh demands for the accuracy and compactness it became very difficult to develop antenna elementswhich fulfil all the strict requirements. Integrated SDARS (Satellite Digital Audio Radio Service)antenna element is one of such tasks which require strong gain requirements at particular elevationangles for the best reception of the satellite signals along with the car manufacturer’s desired mountingpositio

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3

Kim, Yongjin. "Development of automobile antenna design and optimization for FM/GPS/SDARS applications." Connect to this title online, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1054307551.

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Thesis (Ph. D.)--Ohio State University, 2003.<br>Title from first page of PDF file. Document formatted into pages; contains xvii, 158 p.; also includes graphics Includes bibliographical references (p. 154-158). Available online via OhioLINK's ETD Center

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4

Mammadrzali, S. S. "Нouston, we’ve got a problem: can sdg’s and human rights be friends in digital age?" Thesis, Вектор, 2020. https://er.nau.edu.ua/handle/NAU/44275.

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The history of our world is certainly not devoid of disputes and conflicts that have shattered the ability to exercise control over a previously held territory by the state governments all across the globe. Such catastrophic losses for the defeated and grandiose achievements for the victors have defined and described our world for so long with the cost of countless lives of the innocent, yet even today, when sovereignty has undeniably become one of the most frequently used terms in public discourse on international political events, it is surprisingly difficult to ascertain exactly when the s

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5

Hale, Michael T. "New Deal To New Majority: SDS’s Failure to Realign the Largest Political Coalition in the 20th Century." Bowling Green State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1447966535.

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6

Zhang, Bin. "Fatigue behavior in an aluminum casting alloy (A356.2): Effects of some defects, SDAS, Hipping and strontium modification." Diss., The University of Arizona, 2002. http://hdl.handle.net/10150/280228.

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Effects of pore, secondary dendrite arm spacings (SDAS ), hot isostatic pressing (Hipping), and strontium-modification on fatigue behavior were studied in an aluminum casting alloy (A356.2). Microstructures were revealed by X-ray radiography, light microscopy and scanning electron microscopy. Small-cracks were monitored by taking replicas of the surfaces with which the cracks intersected. As the SDAS increases from 15 to 55 μm, fatigue life decreases by a factor of 3 in low-cycle fatigue, and 100 in high-cycle fatigue. When SDAS is less than 30 mum, the pore size is below a critical size of ∼8

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7

Iben, Houria Mohamed. "Etude expérimentale et modélisation de la durée de vie en fatigue d'un alliage d'aluminium de fonderie A356-T6 sous chargement multiaxial." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2015. http://www.theses.fr/2015ESMA0007/document.

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Ce travail a pour objectif d'étudier la tenue en fatigue de l'alliage de fonderie A356-T6 sous chargement multiaxial. Des essais en fatigue à 106 cycles ont été effectués pour deux rapports de chargements différents à Rσ = 0 et Rσ = -1. La première partie expérimentale est menée sur des éprouvettes issues d'une coulée en ‘V’ avec des défauts naturels de fonderie et des défauts artificiels avec une variation de la microstructure. Suite aux résultats expérimentaux, nous avons montré que la taille des défauts ainsi que la microstructure caractérisée par la SDAS, sont les principaux paramètres qui

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8

Li, Kefeng, Mihai Stoica, Changjiang Song, Qijie Zhai, and Jürgen Eckert. "Microstructure evolution of gas-atomized Fe–6.5 wt% Si droplets." Cambridge University Press, 2014. https://tud.qucosa.de/id/qucosa%3A39047.

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The magnetic Fe–6.5 wt% Si powder was produced by gas atomization and its microstructure was also investigated. The secondary dendritic arm spacing (SDAS) is related to the droplet size, λ = 0.29 · D⁰·⁵, and the numerical solidification model was applied to the system, giving rise to the correlation of microstructure to the solidification process of the droplet. It is found that the solid fraction at the end of recalescence is strongly dependent on the undercooling achieved before nucleation; the chances for the smaller droplets to form the grain-refined microstructures are less than the large

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9

Deora, Gautam Krishnakumar. "Simulation and Mathematical Tools for Performance Analysis of Low-Complexity Receivers." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/31127.

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In recent years, research on the design and performance evaluation of suboptimal receiver implementations has received considerable attention owing to complexity in the realization of the optimal receiver algorithms over wireless channels. This thesis addresses the effects of using reduced complexity receivers for the Satellite Digital Audio Radio (SDAR), Code Division Multiple Access (CDMA) and UltraWideband (UWB) communications technologies. A graphical-user-interface simulation tool has been developed to predict the link reliability performance of the SDAR services in the continental Unite

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10

Bogdanoff, Toni, and Jimmy Dahlström. "The influence of copper on an Al-Si-Mg alloy (A356) - Microstructure and mechanical properties." Thesis, Jönköping University, JTH, Mechanical Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-9480.

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<p>Aluminum alloys are widely used in many manufacturing areas due to good castability, lightness and mechanical properties. The purpose of this research is to investigate copper’s influence on an Al-Si-Mg alloy (A356). Copper in the range of 0.6 – 1.6 wt. % has been used in an A356 aluminum based alloy. In this work a simulation of three different casting processes, sand-, die- and high pressure die-casting has been employed with the help of gradient solidification equipment. The microstructure of the samples has been studied by optical and scanning electron microscopy. Materials in both as-c

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11

Beddeleem, G. "Antennes multistandards combinées à polarisations multiples pour les applications spatiales." Phd thesis, Université de Nice Sophia-Antipolis, 2009. http://tel.archives-ouvertes.fr/tel-00453166.

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Aujourd'hui, les nouveaux appareils électroniques de télécommunications tendent toujours à plus d'innovations, plus de services et le tout dans de faibles dimensions. Face à un nombre de standards toujours croissant, les nouvelles antennes associées doivent être capables de couvrir plusieurs bandes de fréquences avec des caractéristiques de rayonnement variées, en un minimum d'encombrement. Cette thèse a permis la conception de plusieurs antennes combinées à polarisations multiples pour les applications spatiales. À partir d'un état de l'art d'antennes de géométries variées et devant la comple

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12

Lindrud, Lennart, and Göran Lindgren. "The influence of Mn on the microstructure and mechanical properties of Al-Si based alloys containing Fe." Thesis, Jönköping University, JTH, Mechanical Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-377.

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<p>Abstract</p><p>The purpose of this research is to investigate the influence of Manganese (Mn) on cast aluminum alloys where a substantial amount of Iron (Fe) is included. Ductility and tensile strength need to be improved in recycled aluminum alloys where greater amounts of Fe are found. Fe is a common impurity and is known to be detrimental to mechanical properties and in order to neutralize the effects of Fe; modifiers such as Mn are added. In this investigation, attempts will be carried out aiming to find the optimal amount of Mn. Other related topics that will be discussed are whether t

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13

Luciani, Cristiano. "Caratterizzazione di leghe di alluminio da fonderia per impieghi motoristici." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/6531/.

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L'alluminio e le sue leghe sono fra i materiali più importanti nell’ambito dell'ingegneria meccanica e trovano spazio in tutti i principali settori dell’industria aerospaziale e motoristica. La loro versatilità è legata principalmente all’elevata resistenza specifica indotta dal trattamento termico, all’ottima resistenza alla corrosione e all’elevata conducibilità elettrica e termica. Purtroppo l’effetto di rinforzo indotto del trattamento termico viene ad essere compromesso nel caso di applicazioni delle leghe a temperature superiori ai 200°C. Negli ultimi anni, al fine di aumentare l’effic

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14

Che, Jiukun. "A Compact Universal Antenna System for Automobiles." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1577704073918621.

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15

Julišová, Martina. "Optimalizace tepelného zpracování slitiny hliníku AlSi7Mg0,6." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229932.

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The presented diploma thesis deals with various types of quenching and their respective effects on mechanical and structural properties of AlSi7Mg0.6 alloy castings. Cast with precision casting technology into a self-supporting ceramic shell made by plaster investment technology, flat test bars cast by Alucast were used as experimental samples. Sample castings were used in both cast state and after T6 heat treatment. Air-flow and air-water combination with varying water passage (spraying) were used as the quenching media in the quenching process of the castings. In order to evaluate the effect

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16

Tadesse, Abel. "On the Volume Changes during the Solidification of Cast Irons and Peritectic Steels." Doctoral thesis, KTH, Metallernas gjutning, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202558.

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This thesis work deals with the volume changes during the solidification of cast irons and peritectic steels. The volume changes in casting metals are related to the expansion and/or contraction of the molten metal during solidification. Often, different types of shrinkage, namely macro- and micro-shrinkage, affect the casting quality. In addition to that, exposure of the metal casting to higher contraction or expansion during the solidification might also be related to internal strain development in samples, which eventually leads to surface crack propagation in some types of steel alloys dur

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17

Timelli, Giulio. "Correlation between processing and quality of aluminium alloy castings (Correlazione tra parametri di processo di fonderia e qualità dei prodotti)." Doctoral thesis, Università degli studi di Padova, 2008. http://hdl.handle.net/11577/3425051.

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The influence of processing and process parameters plays a key role for the Aluminium foundry and transport industries as it affects the quality and soundness of the cast products. Particularly, the choice of a process chain in Aluminium foundry, otherwise of process parameters, influences the reject rates, hence casting costs, the process yield and the production rate. The process chain in Aluminium foundry is a complex sequence of processes and the final casting quality depends on many parameters. Several aspects of this subject are still not fully understood. The motivation of the research

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18

Bai, Yu. "Smart Antenna RF Front-end for WLAN and SDARS." Thesis, 2006. http://hdl.handle.net/10012/2607.

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This thesis presents RF front-end system design for both WLAN (Wireless Local Area Network) and SDARS (Satellite Digital Audio Radio System) applications using adaptive smart antenna technique. It is important to understand that smart antenna system with adaptive beam-forming provides the following advantages: 1. It can concentrate radio transmission on specific directions by modifying transmit/receive phase and amplitude characteristics, and therefore provides greater coverage and increased capacity. 2. It can greatly reduce multi-path fading effect and co-channel interference. This thesis fi

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19

Navarro, Aranda Monica. "Comparative study of casting simulation softwares for future use during early stages of product development." Thesis, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-28023.

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Within industrial product development processes there is an increasing demand towards reliable predictions of the material behavior, which aims to promote a property driven development that can reduce the lead times. The implementation of simulation based product development with integrated casting simulation may enable the design engineers to gain an early understanding of the products with relation to castability, and orient the subsequent design refinement so as to achieve the desired mechanical properties. This work investigates the suitability of three commercial casting simulation softwa

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20

Armanjo, Jahanmehr. "The influence of microstructural deformations and defects on mechanical properties in cast aluminium components by using Digital Image Correlation Techniques (DICT)." Thesis, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-28022.

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Digital image correlation techniques (DICT), a non-contact deformation measuring technique based on gray value digital images, have become increasingly used over the last years. By using the DIC technique during a tensile test, the deformation behavior of different engineering material under an applied load can be determined and analyzed. Digital images, acquired from a tensile test, can be correlated by using DICT software and from that the local or global mechanical properties can be calculated. The local or global mechanical properties determination of a flat test specimens are based on the

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21

Sevastopolev, Ruslan. "Effect of conformal cooling in Additive Manufactured inserts on properties of high pressure die cast aluminum component." Thesis, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-50949.

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Additive manufacturing can bring several advantages in tooling applications especially hot working tooling as high pressure die casting. Printing of conformal cooling channels can lead to improved cooling and faster solidification, which, in turn, can possibly result in better quality of the cast part. However, few studies on advantages of additive manufactured tools in high pressure die casting are published.The aim of this study was to investigate and quantify the effect of conformal cooling on microstructure and mechanical properties of high pressure die cast aluminum alloy. Two tools each

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22

Anastácio, Rita Sofia Santos. "Um contributo para a conservação da biodiversidade e para a gestão de recursos naturais." Doctoral thesis, 2018. http://hdl.handle.net/10773/24030.

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A área da Conservação em Biologia tem como principais objetivos cuidar e encontrar meios de supervisão constante dos componentes dos ecossistemas. A eterna vigilância exige ao biólogo um olhar cada vez mais abrangente e interdisciplinar, não só dos processos específicos que ocorrem no mundo natural, mas também da procura de respostas para a gestão (dentro daquilo que é possível) desse mesmo mundo natural. O presente estudo focou-se em pesquisar um conjunto de indicadores informativos sobre o status dos serviços dos ecossistemas e de elementos da diversidade biológica de uma área no norte de M

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