Dissertations / Theses on the topic 'Site testing'
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Winkelman, Paul M. "On-site testing of crop drying fans." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/45939.
Full textThe commercial peanut dryers used today were first conceived when energy was relatively inexpensive. Since then, energy costs have increased significantly, and more efficient peanuts dryers are desirable. To evaluate dryer efficiency, a mobile fan test facility was designed, built and calibrated for on-site fan airflow and energy measurements. Four-, six-, and eight-trailer peanut dryers were tested for performance. The characteristics observed were delivery of fan airflow as compared to manufacturers' ratings, air distribution to each of the trailer supply ports, plenum leaks, and energy savings achieved by the use of flow controls. For testing, air to the dryer fan was provided by a centrifugal supply fan, where the flowrate was determined by measuring the pressure drop across calibrated perforated plate positioned between the two fans. Airflow through each of the trailer supply ports was determined in a similar manner by measuring the pressure drop across calibrated resistance plates. Measured airflow to the trailers from dryer fans was found to be 75 to 100% of the airflow given by the manufacturers' ratings. Air distribution was poor in dryers with no baffle. However, the installation of a baffle resulted in significant improvement in air distribution. The baffle a pressure rise which reduced total airflow up to 5%. Based on a recommended airflow of 0.167 m3/s per m3 of peanuts, fan inlets were restricted to reduce airflow, and energy savings as high as 35% were achieved. Repairs on poorly maintained dryers increased flowrate from 3 to 7%.
Master of Science
Pickard, Robert K. L. "FACTORS ASSOCIATED WITH ANONYMOUS HIV TESTING AT A COMMUNITY-BASED TESTING SITE IN COLUMBUS, OH." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1250005469.
Full textStreich, Ronald G., and Charles R. Townsend. "Windows at a Tracking Site." International Foundation for Telemetering, 1993. http://hdl.handle.net/10150/611864.
Full textRapid setup and verification of 4 automatic tracking antennas, 2 radio frequency switch matrixes, 32 telemetry receivers with 16 diversity combiners, an intermediate frequency switch matrix and the signal distribution equipment interface to the analog and digital fiber optic relay systems was required. This paper provides sample displays of the station status window, telemetry receiver and test parameter dialog boxes, mission event log window and test result windows for bit error rate, noise power ratio, solar calibration and antenna servo tests. Use of the software is apparent from sample displays so the text concentrates on lessons learned from site surveys, verification of configuration against mission files, accommodation of change of plug-in modules (e.g., IF filters in the telemetry receiver), tolerance of equipment removed from the system for maintenance, built-in test of serial and parallel communications and modular software design for replacement of equipment.
Gombar, Brett Anthony. "Design and Evaluation of a Mobile Instrumentation Platform for Unmanned Vehicle Testing." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/33113.
Full textMaster of Science
Trinka, Michael Robert. "Defect site prediction based upon statistical analysis of fault signatures." Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969/95.
Full textLombardi, Gianluca <1979>. "Astronomical site testing in the era of the extremely large telescopes." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/2031/1/lombardi_gianluca_tesi.pdf.
Full textLombardi, Gianluca <1979>. "Astronomical site testing in the era of the extremely large telescopes." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/2031/.
Full textKlinka, Karel, Gordon J. Kayahara, and Christine Chourmouzis. "Testing site index-site factor relationships for predicting lodgepole pine and interior spruce productivity in central British Columbia." Forest Sciences Department, University of British Columbia, 1998. http://hdl.handle.net/2429/767.
Full textCheng, Hung-wai Gary, and 鄭雄偉. "Analysis of self-boring pressuremeter tests: a case study from Wanchai reclamation site." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B42577573.
Full textAndersen, Ross E. "An on-site test battery to evaluate giant slalom skiing performance /." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63915.
Full textTolmasoff, William A. "Study of Paper Microbial Fuel Cells for Use In On-Site Wastewater Testing." DigitalCommons@CalPoly, 2019. https://digitalcommons.calpoly.edu/theses/2037.
Full textVernotte, Alexandre. "A pattern-driven and model-based vulnerability testing for Web applications." Thesis, Besançon, 2015. http://www.theses.fr/2015BESA2024/document.
Full textThis thesis proposes an original approach, dubbed PMVT for Pattern-driven and Model-basedVulnerability Testing, which aims to improve the capability for detecting four high-profile vulnerabilitytypes, Cross-Site Scripting, SQL Injections, CSRF and Privilege Escalations, and reduce falsepositives and false negatives verdicts. PMVT relies on the use of a behavioral model of theapplication, capturing its functional aspects, and a set of vulnerability test patterns that addressvulnerabilities in a generic way. By adapting existing MBT technologies, an integrated toolchain that supports PMVT automates thedetection of the four vulnerability types in Web applications. This prototype has been experimentedand evaluated on two real-life Web applications that are currently used by tens of thousandsusers. Experiments have highlighted the effectiveness and efficiency of PMVT and shown astrong improvement of vulnerability detection capabilities w.r.t. available automated Web applicationscanners for these kind of vulnerabilities
Glorian, Heinrich, Viktor Schmalz, Pawel Lochyński, Paul Fremdling, Hilmar Börnick, Eckhard Worch, and Thomas Dittmar. "Portable Analyzer for On-Site Determination of Dissolved Organic Carbon — Development and Field Testing." Molecular Diversity Preservation International (MDPI), 2018. https://tud.qucosa.de/id/qucosa%3A33327.
Full textLai, Carlo Giovanni. "Simultaneous inversion of Rayleigh phase velocity and attenuation for near-surface site characterization." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/20748.
Full textOzyurt, Gokhan. "Cataloging And Statistical Evaluation Of Common Mistakes In Geotechnical Investigation Reports For Buildings On Shallow Foundations." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12615084/index.pdf.
Full textdo not receive the attention they deserve. In this study, site investigation reports, that are required for the license of design projects, are examined and the missing/incorrect site investigations, laboratory tests, geotechnical evaluations and geotechnical suggestions that occur in the reports are catalogued. Also, frequency of each mistake is statistically examined
for geotechnical engineers, recommendations and solutions are presented to help them avoid frequent problems.
Travouilon, Tony Physics Faculty of Science UNSW. "Measurements of optical turbulence on the Antarctic Plateau and their impact on astronomical observations." Awarded by:University of New South Wales. Physics, 2005. http://handle.unsw.edu.au/1959.4/20852.
Full textKenyon, Suzanne Laura Physics Faculty of Science UNSW. "A universe of sky and snow: site-testing for optical astronomy at Dome C, Antarctica." Awarded by:University of New South Wales. Physics, 2007. http://handle.unsw.edu.au/1959.4/40822.
Full textMusso, Luca. "Assessment of reverberation chamber testing for automotive applications." Lille 1, 2003. https://ori-nuxeo.univ-lille1.fr/nuxeo/site/esupversions/835bc522-1d53-454d-8980-9dd63af47559.
Full textWu, Xiaochun. "Structure/calcium affinity relationships of calmodulin site III : testing the acid-pair Hypothesis using calmodulin mutants." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq25189.pdf.
Full textMalla, Avishek. "Assessing the requirements for power performance testing at the national small wind turbine centre test site." Thesis, Malla, Avishek (2010) Assessing the requirements for power performance testing at the national small wind turbine centre test site. Masters by Coursework thesis, Murdoch University, 2010. https://researchrepository.murdoch.edu.au/id/eprint/4055/.
Full textBennion, Nancy. "The Effects of Alternative-site Blood Glucose Monitoring on Testing Frequency, Pain Rating, and Glycosylated Hemoglobin." DigitalCommons@USU, 2003. https://digitalcommons.usu.edu/etd/5495.
Full textWu, Chunquan. "Temporal change of seismic velocity and site response for different scales and implications for nonlinearity." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/24619.
Full textFrost, Carla J. "Selection criteria used by site administrators for preparation practices for California Standards Tests in mathematics." Scholarly Commons, 2008. https://scholarlycommons.pacific.edu/uop_etds/2373.
Full textHood, Angela N. "Testing the Veracity of Paleoethnobotanical Macroremain Data: A Case Study from the Cer¿¿¿¿n Site, El Salvador." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1337287040.
Full textLi, Anthony. "Mapping the site of origin of ventricular arrhythmias : the development and testing of a novel pacemapping algorithm." Thesis, St George's, University of London, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.703122.
Full textFeldhues, William J. "The remains of First Street : phosphate testing and archaeological excavation at the James F. D. Lanier State Historic Site in Madison, Indiana." Virtual Press, 1998. http://liblink.bsu.edu/uhtbin/catkey/1115240.
Full textDepartment of Anthropology
Kimble, Elicia Victoria. "Archaeological Survey and Testing on St. Vincent Island, Northwest Florida." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4349.
Full textMenzer, Jeremy G. "Discovering Rock Features with Geophysical Exploration and Archaeological Testing at the Mississippian Pile Mound Site, Upper Cumberland Plateau, Tennessee." Digital Commons @ East Tennessee State University, 2015. https://dc.etsu.edu/etd/2509.
Full textStaniscia, Martina. "On-site testing of joint shear strength in masonry constructions: an experimental study in a traditional adobe building in Portugal." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
Find full textMohr, Judy Lynette. "Atmospheric Turbulence Characterisation Using Scintillation Detection and Ranging." Thesis, University of Canterbury. Department of Physics and Astronomy, 2009. http://hdl.handle.net/10092/3195.
Full textLow, Han Eng. "Performance of penetrometers in deepwater soft soil characterisation." University of Western Australia. School of Civil and Resource Engineering, 2009. http://theses.library.uwa.edu.au/adt-WU2010.0008.
Full textMorrall, Andrew J. "A usability study of a language centre web site." Thesis, Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25474108.
Full textChu, Lap-man Raymond, and 朱立民. "Material identification and subsurface stratigraphy of Penny's Bay reclamation site: by the method of subsurfaceexploration : piezocone penetration test and drilling." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B42576660.
Full textBurch, Patrick L. "Effect of time from treatment to disturbance on woody plant control with triclopyr, picloram and/or 2,4-D." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/104296.
Full textSaliko, Denis. "Investigation of the structural response of pavements in cold region using instrumented test site data." Licentiate thesis, KTH, Byggnadsmaterial, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-290939.
Full textUtvecklingen av det strukturella tillståndet av vägbyggnader är beroende av trafikmängd samt vägkonstruktionens omgivningsfaktorer. En mekanistisk-empiriskdimensioneringsmetod för vägkonstruktioner är under utveckling i Sverige med huvudsyftet att på realistiskt sätt kunna förutsäga vägens respons och tillståndsutveckling. En M-E dimensionering betyder att man applicerar mekanistiska grundprinciper för att bestämma vägkonstruktionens respons under trafikbelastning och tillämpar sedan överföringsfunktioner för att förutsäga nedbrytningsförloppet. Att använda en mekanistiskt baserad metod innebär att man får en grundläggande förståelse av hur vägkonstruktionen svarar på en specifik påverkan eller belastning. Detta mera realistiska tillvägagångsätt ger dessutom ökad flexibilitet och gör att metoden kan appliceras vid nya belastningsfall eller under nya klimatförhållanden. Det blir därför möjligt att ta hänsyn till det riktiga belastningsfallet under de rätta klimatförhållandena. Detta gör att nyamodeller för vägkonstruktionens respons behövs och att dessa måste valideras för realistiska trafikbelastningsfall. I denna licentiatavhandling undersöks hur omgivningsvariabler och trafikbelastning från tunga lastbilar påverkar vägkonstruktioner. Resultat från denna studie bygger på omgivningsdata från ett stort antal mätstationer i Sverige och från mätningar från två instrumenterade vägsträckor nära byn Långträski Norrland. Båda vägkonstruktionerna består av tunna vägöverbyggnader och därför är responsen starkt beroende av beläggningstemperaturen och fuktinnehållet i vägbyggnadens obundna lager samt frostdjupet.Rapporten bygger på tre publikationer.Första artikeln presenterar hur frostdjup i svenska vägar kan förutsägas utifrån en statistisk modell som använder ett frostindex beräknat från lufttemperaturen. Modellen bygger på en anpassning av data från 44 meteorologiska väderstationer och 49 av Trafikverkets väderinformationsstationer distribuerade över alla fem klimatzoner i Sverige. Den andra artikeln fokuserar på responsmätningar från en instrumenterad vägtestplats där både fallvikt samt tunga lastbilar har använts för lastgenerering. Den vägtekniska instrumenteringen bestod av asfalttöjningsgivare (ASG), trycktöjningsgivare (MU), och jordtyckceller (SPC) installerade på olika djup. Styvhet av de olika lagren bakberäknades baserat på data från fallviktsmätningarna. De registrerade värdena från de vägtekniska givarna jämfördes med desom beräknades med hjälp av beräkningsverktyget ERAPave. Tre lastbilar med den totala tyngden mellan ~64 –~74 ton användes sedan för att jämföra deras relativa nedbrytningseffekt. Slutsatsen är att om antal axlar ökas med ökad tyngdoch om parmonterade däck användes är nedbrytningseffekten från 74 ton lastbil inte större än från en lättare lastbil med färre axlar. I artikel tre fokuseras det på effekten av hur klimatfaktorer påverkar vägkonstruktionens respons. Samma lastbilar som iden andra artikeln användes under fyra mätkampanjer vid olika tidpunkter på året. Omgivningsparametrarna registrerades i form av beläggningstemperatur och fukt i de obundna lagren samt frostdjupet. Vägens mekaniska respons beräknades genom att uppdatera styvhetsmodulerna utifrån beläggningens temperatur och de obundna lagrens med fuktkvoter och jämföra med de uppmätta responsvärdena. Beräkningsmetodiken visar sig ge bra överensstämmelse med det om uppmättes.
QC 210303
Eker, Mert Arif. "Determination Of The Dynamic Characteristics And Local Site Conditions Of The Plio-quarternary Sediments Situated Towards The North Of Ankara Through Surface Wave Testing Methods." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610824/index.pdf.
Full textubuk and its close vicinity with the aid of Geographical Information Systems (GIS) through establishing seismic characterization and local soil conditions of the area.
Rice, Emma May. "Testing the late-Holocene climate signal from ombrotrophic bogs in southernmost Chile and the Falkland Islands : a multi-proxy, multi-profile and multi-site approach." Thesis, University of Plymouth, 2017. http://hdl.handle.net/10026.1/9666.
Full textDerouiche, Ziane. "Caractérisation des milieux hétérogènes par traitement du signal ultrasonore haute fréquence rétrodiffusé." Valenciennes, 1994. https://ged.uphf.fr/nuxeo/site/esupversions/0953f68f-a6e3-4aeb-8bf3-8a70b23ca2d6.
Full textOuarradi, Noureddine. "Etude théorique et expérimentale du champ ultrasonore transitoire généré par un transducteur plan dans un milieu solide homogène et isotrope : Approche de la réponse impulsionnelle de diffraction." Valenciennes, 1999. https://ged.uphf.fr/nuxeo/site/esupversions/00c238b0-7907-4a5d-a70f-ddf9c707e8e9.
Full textFerrero, Chiara. "Structural behaviour of masonry arches on moving supports : from on-site observation to experimental and numerical analysis." Doctoral thesis, Universitat Politècnica de Catalunya, 2021. http://hdl.handle.net/10803/672366.
Full textDesde la antigüedad, los maestros constructores han utilizado el arco como elemento estructural para salvar grandes luces en estructuras de mampostería. En consecuencia, para la conservación del patrimonio arquitectónico es hoy en día de fundamental importancia la correcta verificación estructural de este tipo de elementos. Se ha observado frecuentemente que el desplazamiento de los apoyos es una de las principales causas de daño en arcos de mampostería. De entre las distintas causas que pueden provocar dicho desplazamiento, el deslizamiento de tierras ha recibido poca atención por parte de la comunidad científica. La presente tesis encuentra su motivación en el daño extenso y severo observado en los arcos de las iglesias de mampostería ubicadas en zonas expuestas a deslizamiento de tierras. Este fenómeno produce una combinación de desplazamientos verticales y horizontales, cuyo efecto en el comportamiento estructural de los arcos no ha sido investigado en profundidad, especialmente en lo relativo a grandes desplazamientos. Esta tesis aspira a contribuir al conocimiento del comportamiento mecánico de los arcos de mampostería sometidos a grandes desplazamientos de apoyos, con especial atención a los desplazamientos inclinados. La metodología utilitzada para dicho fin incluye ensayos experimentales y análisis numéricos en un modelo a escala de un arco de mampostería a junta seca. El modelo fue ensayado bajo diferentes combinaciones de desplazamientos horizontales y verticales en uno de sus apoyos. La simulación numérica fue desarrollada en el marco de grandes desplazamientos usando dos métodos numéricos diferentes: un modelo de elementos finitos (FE) y un modelo de bloques rígidos (RB). Los modelos fueron concebidos como un conjunto de dovelas rígidas con infinita resistencia a compresión en el modelo FE y como dovelas infinitamente rígidas en el modelo RB. En ambos modelos la interfaz entre dovelas fue modelada sin resistencia a tracción. Con el objetivo de diseñar la configuración experimental y adquirir una comprensión inicial de la respuesta del arco, se llevaron a cabo simulaciones numéricas preliminares en las cuales se consideró al arco estudiado como una estructura rígida. Para ello en el modelo FE del arco, la rigidez normal de la interfaz fue inicialmente caracterizada con un valor muy elevado. La campaña experimental fue llevada a cabo en modelos a escala 1:10. Los resultados de los ensayos experimentales permitieron, por primera vez en la literatura, un análisis preciso del efecto que tiene la dirección del desplazamiento impuesto en el comportamiento del arco en marco de grandes desplazamientos. La comparaci ón entre los resultados numéricos y experimentales mostró que los modelos numéricos no eran capaces de capturar de manera precisa la respuesta experimental. Para investigar esta discrepancia, se realizó un estudio de sensibilidad relativo al efecto de la rigidez normal de la interfaz sobre las predicciones del modelo FE. Los resultados demostraron que la diferencia entre los resultados numéricos y experimentales se debía a las imperfecciones de las juntas del modelo físico. Como consecuencia, se propuso la inclusión de imperfecciones en el modelo numérico. Para ello se calibró la rigidez normal de la interfaz según los resultados experimentales y el modelo se validó con nuevas simulaciones. Finalmente, con el fin de investigar el efecto de las imperfecciones en la respuesta del arco, se llevó a cabo otro ensayo con el mismo modelo experimental, pero añadiéndole imperfecciones. El ensayo fue simulado con un modelo calibrado FE. Los resultados obtenidos mostraron que las imperfecciones juegan un rol fundamental en la respuesta de arcos a pequeña escala con grandes desplazamientos en los apoyos. Además, la reducción de la rigidez normal de la interfaz con respecto al valor muy elevado inicialmente adoptado demostr ó ser una estrategia efectiva para simular las imperfecciones de los modelos experimentales.
Fin dall’antichità, i maestri costruttori hanno utilizzato gli archi per coprire grandi luci nelle strutture in muratura. Di conseguenza, ad oggi la valutazione della sicurezza di questi elementi strutturali gioca un ruolo fondamentale nella conservazione del patrimonio architettonico. A causa del loro frequente verificarsi, gli spostamenti degli appoggi sono una delle principali fonti di danno per gli archi in muratura. Tra le potenziali cause di questi spostamenti, le frane a cinematica lenta hanno ricevuto pochissima attenzione da parte della comunità scientifica. La presente tesi è motivata dall'osservazione di danni ingenti negli archi di chiese storiche in muratura interessate da frane a cinematica lenta. Questi fenomeni producono una combinazione di spostamenti verticali e orizzontali agli appoggi, il cui effetto sul comportamento strutturale dell'arco non è mai stato studiato a fondo in letteratura, soprattutto nell’ambito di grandi spostamenti. Alla luce di queste osservazioni, questa tesi si propone di fornire una piena comprensione della meccanica degli archi in muratura soggetti a grandi spostamenti degli appoggi, con particolare attenzione agli spostamenti inclinati. La metodologia utilizzata per raggiungere questo obiettivo ha incluso sia prove sperimentali che analisi numeriche su un arco ribassato in muratura di giunti a secco in piccola scala, in cui sono state applicate diverse combinazioni di spostamenti orizzontali e verticali in corrispondenza di un appoggio. Le simulazioni numeriche sono state eseguite nell’ambito dei gradi spostamenti utilizzando due diversi approcci numerici basati su una modellazione ad elementi finiti (FE) ed una modellazione a blocchi rigidi (RB). È stata adottata una strategia di micro-modellazione, in cui l'arco è stato modellato come un assemblaggio di blocchi, molto rigidi e infinitamente resistenti a compressione nel modello FE e infinitamente rigidi nel modello RB. In entrambi i modelli i blocchi erano collegati da interfacce senza resistenza a trazione. Simulazioni numeriche preliminari, finalizzate a progettare il set-up sperimentale e ad acquisire una prima conoscenza della risposta dell'arco, sono state eseguite considerando l'arco come una struttura rigida non resistente a trazione. A tal fine, nel modello FE è stato adottato un valore molto elevato di rigidezza normale delle interfacce. Un’ampia campagna sperimentale è stata eseguita su un modello in scala 1:10 costruito come un assemblaggio a secco di blocchi realizzati con un materiale composito bicomponente. I risultati delle prove sperimentali hanno permesso, per la prima volta in letteratura, di valutare con precisione l'effetto della direzione degli spostamenti imposti sulla risposta dell'arco nell’ambito dei grandi spostamenti. Il confronto tra i risultati numerici e sperimentali ha mostrato che i modelli numerici non erano in grado di cogliere in maniera accurata la risposta sperimentale, specialmente in termini di spostamento ultimo al collasso. Al fine di indagare le ragioni di questa discrepanza, è stata quindi eseguita un'analisi di sensitività relativa all’effetto della rigidezza normale delle interfacce sulle previsioni del modello FE. I risultati hanno dimostrato che la differenza tra risultati numerici e sperimentali poteva essere attribuita alle imperfezioni, e conseguente deformabilità, delle interfacce del modello fisico. Una strategia per includere le imperfezioni nella modellazione numerica, consistente nel calibrare la rigidezza normale delle interfacce sulla base dei risultati sperimentali, è stata quindi proposta e validata attraverso ulteriori simulazioni FE, i cui risultati si sono rivelati in ottimo accordo con le evidenze sperimentali. Infine, per indagare l'effetto delle imperfezioni geometriche sulla risposta dell'arco, è stata eseguita un’ulteriore prova sperimentale su un modello fisico costituito da blocchi dello stesso materiale composito bicomponente che presentavano però più imperfezioni. Al fine di validare ulteriormente la strategia proposta per modellare le imperfezioni, la prova sperimentale è stata simulata utilizzando un modello FE calibrato. Il confronto tra i risultati sperimentali per i due modelli fisici ha mostrato che le imperfezioni giocano un ruolo fondamentale nella risposta di archi in piccola scala a grandi spostamenti degli appoggi. Inoltre, ridurre la normale rigidezza dell'interfaccia rispetto al valore molto alto adottato per modellare interfacce rigide si è rivelata una strategia efficace per simulare la quantità di imperfezioni dei modelli sperimentali
Enginyeria de la construcció
Williams, Steve. "Advanced Test Range Verification at RF Without Flights." International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/605960.
Full textFlight and weapons test ranges typically include multiple Telemetry Sites (TM Sites) that receive telemetry from platforms being flown on the range. Received telemetry is processed and forwarded by them to a Range Control Center (RCC) which is responsible for flight safety, and for delivering captured best source telemetry to those responsible for the platform being flown. When range equipment or operations are impaired in their ability to receive telemetry or process it correctly, expensive and/or one-of-a-kind platforms may have to be destroyed in flight to maintain safety margins, resulting in substantial monetary loss, valuable data loss, schedule disruption and potential safety concerns. Less severe telemetry disruptions can also result in missing or garbled telemetry data, negatively impacting platform test, analysis and design modification cycles. This paper provides a high level overview of a physics-compliant Range Test System (RTS) built upon Radio Frequency (RF) Channel Simulator technology. The system is useful in verifying range operation with most range equipment configured to function as in an actual mission. The system generates RF signals with appropriate RF link effects associated with range and range rate between the flight platform and multiple telemetry tracking stations. It also emulates flight and RF characteristics of the platform, to include signal parameters, antenna modeling, body shielding and accurate flight parameters. The system is useful for hardware, software, firmware and process testing, regression testing, and fault detection test, as well as range customer assurance, and range personnel training against nominal and worst-case conditions.
Demol, Thierry. "Etude de transducteurs en barrette adaptés au contrôle santé par ondes de Lamb de structures aéronautiques composites : application a la caractérisation de l'impact basse vitesse." Valenciennes, 1998. https://ged.uphf.fr/nuxeo/site/esupversions/97d8f63c-45e8-4817-9d51-8352caa3e003.
Full textNowadays, aerospace industries widely use composite materials because of their attractive characteristics. Therefore, suitable nondestructive evaluation methods have been developed. Among them, the use of Lamb waves allows the inspection of large plates with a small number of transducers, making it possible to consider eventually the design of smart materials and structures. Within these developments, the objective of this work is to design and evaluate thin transducers, consisting in several independent piezoelectric elements, called “array transducers”. In the first part, we study the propagation of Lamb waves in stratified carbon-epoxy composites, and the different methods available to inspect these materials are presented. In the second part, we design two couples of moveable transducers. The generated waves are identified using different methods and the efficiency of those transducers is compared with that of classical angled transducers. The principle on which the transducers work is verified experimentally, then improvements are proposed. In the third part, the surface of composites of different lay-ups is equipped with array transducers in order to evaluate their efficiency. The final part is devoted to an assessment of the passive behavior of the transducers when a plate is submitted to the low velocity impacts to which the composites under study are highly sensitive. The experimental results show beyond doubt that the impacts responsible for internal damage can be detected through simple signal processing. As is finally shown, all these results open up new prospects as regards the possible uses to which these array transducers can be put
Dworak, Jennifer Lynn. "Modeling defective part level due to static and dynamic defects based upon site observation and excitation balance." Diss., Texas A&M University, 2004. http://hdl.handle.net/1969.1/323.
Full textAalil, Issam. "Contribution à l’étude du patrimoine bâti. Méthodes de diagnostic des pathologies des structures et moyens de restauration : Etude de cas. Site archéologique Volubilis au Maroc." Thesis, Orléans, 2017. http://www.theses.fr/2017ORLE2067/document.
Full textThe restoration of the built heritage is mandatory to ensure its sustainability. The archaeological site of Volubilis in Morocco, registered on the UNESCO World Heritage list since December 1997, requires restoration works. The main objective of this thesis is to determine the causes of stones’ deterioration and to propose mortars for restoration of its monuments. Firstly, a multi-scales characterization study was carried out on the three facies of the calcarenite, the main building stone in the site. It showed that despite their similar mineralogical composition, the three facies have dissimilar hydric, thermal and mechanical properties and they are quite different in terms of durability against salt crystallization. Besides, non-destructive testing could be used to distinguish the three facies by estimating their porosities and their coefficients of capillarity. Secondly, a diagnosis study revealed the presence of halite and gypsum in most deteriorated stones affected by detachment and loss of material. These salts originated from neighboring mortars, used during the previous interventions. In addition, the deterioration of uncontaminated calcarenites is likely due to thermal stresses. In the last part, we formulated mortars using lime, sand and the brick dust using the mixtures method. This approach would determine compatible mortars to the stone calcarenite
Hagelin, Susanna. "Optical Turbulence Characterization for Ground-Based Astronomy." Doctoral thesis, Uppsala universitet, Institutionen för geovetenskaper, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-132798.
Full textFelaktigt tryckt som Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 708
Assaad, Jamal. "Modélisation des transducteurs piézoélectriques haute fréquence à l'aide de la méthode des éléments finis." Valenciennes, 1992. https://ged.uphf.fr/nuxeo/site/esupversions/daff1271-db25-4894-82dd-828d666c589c.
Full textSuba, Madeleine, and Mattias Lundgren. "Utvärdering av sensitivitet och specificitet för Acro Biotech Multitest 15 vid drogscreening." Thesis, Hälsohögskolan, Högskolan i Jönköping, HHJ, Avd. för naturvetenskap och biomedicin, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-44931.
Full textThe emergency and psychiatric wards on the county hospital Ryhov in Jönköping utilize onsite drug testing with varying quality during evenings and night-time when no staff are operating the chemistry analyzer Konelab Prime 30i. The aim of the study is to evaluate the performance of sensitivity and specificity of Acro Biotech Multitest 15 and comparing results from two different reading-times. The number of urine samples collected for analysis was 272. Positive and negative urine samples with drug concentrations within ± 50% from cut-off were collected. Later, concentrations outside of this range was included. The samples were tested with Multitest 15 at the laboratory for clinical chemistry at Ryhov after analysis with Konelab Prime 30i providing reference results. The drugs tested were amphetamine, methamphetamine, ecstasy, benzodiazepines, buprenorphine, cocaine, methadone, morphine, THC, oxycodone and tramadol. All drugs included, the sensitivity was 86.7% - 100%, the specificity 33% - 100% and the accuracy 71.4% - 94.7%. The sample selection within the range ±50% from the cut-off value was limited, which significantly affected these calculations, and Konelab Prime 30i uses a semi-quantitative method only providing approximate concentration values for reference.
Giordano, Christophe. "Prédiction et optimisation des techniques pour l’observation à haute résolution angulaire et pour la future génération de très grands télescopes." Thesis, Nice, 2014. http://www.theses.fr/2014NICE4136/document.
Full textWith the next generation of extremely large telescope having mirror with a diameter larger than 30m, it becomes essential to reduce the cost of observations and to improve their scientific efficiency. Moreover it is fundamental to build these huge infrastructures in location having the best possible optical quality. The purpose of my thesis is to bring a solution easier and more economical than before. I used the Weather Research and Forecasting (WRF) model and the Trinquet-Vernin parametrization, which computes the values of the optical turbulence, to forecast a couple of hours in advance the evolution of the sky optical quality along the coming night. This information would improve the management of observation program, called "flexible scheduling", and thereby reduce losses due to the atmospheric variations. Our results and improvements allow the model us WRF-TV to have a good agreement between previsions and in-situ measurements in different sites, which is promising for a real use in an observatory. Beyond the flexible scheduling, we wanted to create a tool to improve the search for new sites or site testing for already existing sites. Therefore we defined a quality parameter which takes into account meteorological conditions (wind, humidity, precipitable water vapor) and optical conditions (seeing, coherence time, isoplanatic angle). This parameter has been tested above La Palma in Canary island showing that the Observatorio del Roque de los Muchachos is located close to the best possible location of the island. Finally we created an automated program to use WRF-TV model in order to have an operational tool working routinely
Sogbossi, Hognon Eric Arnaud. "Etude de l'évolution de la perméabilité du béton en fonction de son endommagement : transposition des résultats de laboratoire à la prédiction des débits de fuite sur site." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30210/document.
Full textThe building reactor of the nuclear power plants are designed to provide precise containment and sealing properties in normal use situations and in the event of a nuclear accident, to prevent the spread of radioelements in the environment. Since these enclosures are made of concrete, controlling the evaluation of the permeability of concrete and its evolutions under stress would make it possible to evaluate the leakage rates that may occur over time under certain conditions. Until today, there are several techniques for measuring permeability and these techniques lead to different results for the same concrete specimen. The first study we carried out was therefore to propose a standardization of the permeability measurement: this standardization resulted in the determination of a characteristic permeability of concrete and independent of the measurement technique. In parallel with this approach, we also proposed to evaluate the permeability of concrete using observables from Non-Destructive Testing such as permittivity and electrical resistivity. The results obtained show the possibility of estimating the permeability under concrete conditions on site. The second study carried out relates to the control of the permeability under constraints. In the laboratory, we investigated the permeability of concrete specimens of different sizes under various conditions of drying, thermal stress, mechanical and coupled damage. We could establish permeability-damage models according to each source of damage. The third study carried out relates to the transposition from laboratory results to the site, using nuclear power plants mock-up of larger dimensions and representative of the actual structure (VeRCoRs at scale 1/3). All the results of the first two studies have been used and have led to calculations of leak rates and Time to Reach Steady State (TRSS) consistent with the calculation assumptions
Williams, Valorie Sharron 1960. "In situ microviscoelastic measurements by polarization interferometry." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276691.
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