Tesi sul tema "Scientific missions"
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Stilwell, Bryan D., e Marty Siemon. "A New TDRSS Compatible Transceiver for Long Duration High Altitude Scientific Balloon Missions". International Foundation for Telemetering, 2003. http://hdl.handle.net/10150/606737.
Testo completoHigh altitude scientific balloons have been used for many years to provide scientists with access to space at a fraction of the cost of satellite based experiments. In recent years, these balloons have been successfully used for long duration missions of up to several weeks. Longer missions with durations of up to 100 days (Ultra-Long) are on the drawing board. An enabling technology for the growth of the scientific balloon missions is the use of the NASA Tracking and Data Relay Satellite System (TDRSS) for telemetering the health, status, position and payload science data to mission operations personnel. The TDRSS system provides global coverage by relaying the data through geostationary relay satellites to a single ground station in White Sands New Mexico. Data passes from the White Sands station to the user via commercial telecommunications services including the Internet. A forward command link can also be established to the balloon for real-time command and control. Early TDRSS communications equipment used by the National Scientific Balloon Facility was either unreliable or too expensive. The equipment must be able to endure the rigors of space flight including radiation exposure, high temperature extremes and the shock of landing and recovery. Since a payload may occasionally be lost, the cost of the TDRSS communications gear is a limiting factor in the number of missions that can be supported. Under sponsorship of the NSBF, General Dynamics Decision Systems has developed a new TDRSS compatible transceiver that reduces the size, weight and cost to approximately one half that of the prior generation of hardware. This paper describes the long and ultra-long balloon missions and the role that TDRSS communications plays in mission success. The new transceiver design is described, along with its interfaces, performance characteristics, qualification and production status. The transceiver can also be used in other space, avionics or terrestrial applications.
Khatri, Chandni. "Missions of UNESCO and U.S. Involvement". Honors in the Major Thesis, University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/1037.
Testo completoBachelors
Sciences
Political Science
Boumediene, Samir. "Avoir et savoir. L'appropriation des plantes médicinales de l'Amérique espagnole par les Européens (1570-1750)". Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0345.
Testo completoThe aim of this dissertation is to study how, in the aftermath of the Conquest of America, Europeans have appropriated medicinal plants from Mexican, Caribbean, Andean, or Amazonian origin. 18th century European practitioners frequently used substances such as Peruvian bark, ipecacuanha, gaiacum wood, or chocolate – which reveals the extent of the phenomena, yet masks its complexity. Using an American remedy in Europe indeed implied many processes. Crucial to this research are: the sampling and growing of plants; the transmission of indigenous knowledge and its translation by allogenous; the drug trade across the Atlantic; experiences carried out on remedies; and expeditions conducted in America between the 16th and the 18th centuries. More than a “contribution” of America to Europe, this phenomenon of appropriation must be understood as a modality of colonialism. As natural object, and at the same time as naturalistic and medical knowledge, medicinal plants took on a political stake after the Conquest of America. For instance, while in 1570 they had been the target of one of the first scientific expeditions in history, in the middle of the 18th century they also led the Spanish crown to undertake various monopolistic projects. On the other side of the Atlantic, it was at the heart of conflicts between the “Indian” and the Spaniard, when the latter forbade the former from using abortive or hallucinogenic plants, and when the former refused to transmit his pharmacological knowledge to the latter
Cheishvili, Ana. "Collectionneurs et collections d'objets caucasiens dans les musées français : histoire et apports des voyages scientifiques au Caucase. (XIXè - début XXè s.)". Electronic Thesis or Diss., Paris, EHESS, 2023. http://www.theses.fr/2023EHES0176.
Testo completoThis thesis focuses on the analysis of French scientific missions in the Caucasus region and the collections brought back to France following these expeditions. The study covers the period from the mid-19th century to the early 20th century, before the major political changes of the 1910s-1920s. The primary focus is on the scientific missions mandated by the Ministry of Public Instruction, without neglecting collections from non-scientific journeys or antiquarians. This research highlights the interest of the French scientific community in the Caucasus in the 19th century, as well as the motivations of the researchers who went there and the work they conducted in the field. Another priority of this study was to examine the archaeological, ethnographic, and photographic collections held in various museums and archives in France. To do this, an inventory of a database of Caucasian collections and the collection of biographical information on French researchers who contributed to these missions was necessary. The contribution of these collections to the reflection on cultural transfers between the Caucasus and France is also examined. The ultimate goal was the identification and study of these collections for their future integration into museography, highlighting the names of researchers and photographers whose journeys in the Caucasus were previously unknown
Johnson, Michael P. Moye J. Todd. "Skylab the human side of a scientific mission /". [Denton, Tex.] : University of North Texas, 2007. http://digital.library.unt.edu/permalink/meta-dc-3659.
Testo completoJohnson, Michael P. "Skylab: The Human Side of a Scientific Mission". Thesis, University of North Texas, 2007. https://digital.library.unt.edu/ark:/67531/metadc3659/.
Testo completoSpoto, D., O. Cosentino e F. Fiorica. "Transmed, a Scientific Mission Based on Stratospheric Balloons Using S-Band Telemetry Telecommand". International Foundation for Telemetering, 1995. http://hdl.handle.net/10150/611634.
Testo completoAfter briefly presenting the TRANSMED mission, the configuration of the Telemetry and Telecommand links is illustrated and the their dimensioning is analyzed. Both links operate at S-band with satellite grade standards. The system composition, the main equipment and the system growth potential are thereafter presented.
Jéger, Csaba. "Determination and compensation of magnetic dipole moment inapplication for a scientific nanosatellite mission". Thesis, KTH, Rymd- och plasmafysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-212985.
Testo completoSEAM (Small Explorer for Advanced Missions) är en 3U CubeSat utveckladpå KTH Kungliga tekniska högskolan för DC och AC magnetiskfältmätningarav Jordens magnetfält. Mätningar kräver längretidperioder upp till 1000 sekunder utan aktiv attitydstyrning. Satellitenkommer använda passiv tyngdkraftsgradientstabilisering samtmagnetisk dipolmomentkompensation med hjälp av ett separat setav magnetiska spolar för att upprätthålla orienteringskrav under perioderutan attitydstyrning. Denna rapport presenterar en detaljeradmodell av satellitens magnetiskt dipolmoment som inkluderar dipolmomentkällorfrån strömslingor ombord satelliten. Satellitens attityddynamikär karaktäriserad med simulationer och en strategi tas framför att estimera och kompensera det tidsberoende magnetiska dipolmomentetgenom att använda dipolkompensations magnetiska spolaroch en offline estimeringsalgoritm. Algoritmen är testad med simuleradefelkällor och brus och har funnits pålitlig för uppskattning avdipolmomentet och dess kompensation för att uppfylla missionskrav.
Friso, Enrico. "Thermal effects reduction techniques for the SIMBIO-SYS scientific suite of BepiColombo mission". Doctoral thesis, Università degli studi di Padova, 2010. http://hdl.handle.net/11577/3421562.
Testo completoIl progetto di ricerca di questa tesi di dottorato è finalizzato a indagare possibili tecniche di riduzione degli effetti termici per la strumentazione scientifica SIMBIO-SYS della missione ESA BepiColombo a Mercurio. SIMBIO-SYS è una suite integrata di strumenti ottici costituita da tre canali: High Resolution Imaging Channel (HRIC), STereo Imaging Channel (STC), Visual and Infrared Hyperspectral Imager (VIHI). SIMBIO-SYS dovrà operare nell'ambiente termicamente ostile di Mercurio. E' quindi necessaria la progettazione di dedicati ed efficaci sistemi di reiezione del calore e di controllo termico per lo strumento. Il problema è stato affrontato con un approccio il più possibile metodologico al fine di individuare gli aspetti cruciali del problema progettuale. Inizialmente si è valutato l’ambiente termico che lo strumento incontrerà durante le fasi operative in orbita attorno a Mercurio. A tal fine è stato sviluppato un modello matematico in grado di valutare, per le possibili stagioni di Mercurio, i flussi solare, di albedo e planetario incidenti su una superficie orbitante attorno al pianeta secondo l’orbita e l’assetto nominali previsti per il satellite. Lo studio ha reso possibile identificare le orbite maggiormente critiche dal punto di vista termico. Il modello matematico implementato può essere applicato anche a studi riguardanti altre missioni di osservazione planetaria e consente di effettuare agevolmente studi di sensibilità dei flussi orbitali incidenti ai parametri orbitali o di assetto. Il modello matematico implementato permette inoltre di valutare l'angolo di incidenza solare rispetto agli assi ottici dei tre strumenti e ha consentito di identificare le condizioni maggiormnete critiche alla illuminazione solare diretta fornendo vincoli di progetto per le geometrie dei paraluce (baffle) degli strumenti. Le geometrie dei baffle della attuale configurazione prevista dal progetto sono state verificate all'ingresso diretto di raggi solari in orbita grazie alla implementazione di algoritmi di ray-cating ed è stato fornito un corrispettivo margine angolare per ciascun baffle. Successivamente sono stati sviluppati dei modelli termici, con approccio a parametri concentrati, dei baffle dei tre canali di SIMBIO-SYS utilizzando il software ESARAD/ESATAN, stimando così le potenze termiche scambiate, la distribuzione delle temperature e le prestazioni del sottosistema in termini di capacità di reiezione del calore. E' stato approfondito lo studio del baffle riflettente di tipo Stavroudis del canale ad alta risoluzione ed è stata individuata la geometria ottimale per la modellazione con gli attuali software commerciali disponibili di analisi termica. Questo studio ha condotto inoltre alla individuazione di criteri per la valutazione delle prestazionidel baffle Stavroudis utili a guidare il progetto di un apparato sperimentale per la caratterizzazione delle prestazioni del baffle.L'attività di ricerca è poi proseguita con il dimensionamento a livello di sistema di un apparato sperimentale finalizzato a riprodurre a terra l'ambiente termico incontrato dallo strumento in orbita attorno Mercurio. Esso è concepito per riprodurre all'interno di una camera termo vuoto l'andamento dei flussi solare e infrarosso incidenti sullo strumento e le interfacce radiative e conduttive della strumentazione con il satellite, tenendo conto della orientazione dello strumento durante il moto orbitale rispetto alle sorgenti di radiazione. I modelli matematici sviluppati e le analisi termiche eseguite hanno fornito le specifiche di progetto dell'apparato sperimentale ed utili dati numerici per la definizione del simulatore a livello di sistema. I metodi di analisi e di progetto sviluppati hanno contribuito alla definizione di efficienti sistemi di riduzione degli effetti termici per la strumentazione SIMBIO-SYS.
Barrie, A. C. "An Analysis of Scientific Data Quality for the Fast Plasma Investigation of the MMS Mission". Thesis, University of Colorado at Boulder, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=10934761.
Testo completoThis work describes technical innovations to improve the data quality and volume for the Fast Plasma Investigation (FPI) on board the Magnetospheric Multiscale mission (MMS). A parametric study of wavelet compression has shown that plasma count data can be compressed to high compression ratios with a minimal effect on the integrated plasma moments. Different regions of the magnetosphere are analyzed for both electron and ion count data. The FPI trigger data, intended as a data ranking metric, has been adapted and corrected to a point where scientifically accurate pseudo moments can be generated and released to the research community, drastically increasing the availability of high time resolution data. This is possible due to a scaling system that tunes the dynamic range of the system per region, and the method of using a neural network to correct for exterior contamination effects, such as spacecraft potential. Finally, a map of detection angle bias has been generated that can be used to correct raw count for errors in look direction of incoming particles. This map was generated by statistically sampling particle flight paths through a charged spacecraft environment, validating against flight data. All three of these efforts lead toward the overarching goal of improving data quality and volume for the FPI suite, and future missions to come.
Baker, Graham. "Eugenics and Christian mission : charitable welfare in transition : London and New York, c. 1865-1940". Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:0aa85bak704-ded0-4913-8cda-7d8ae575357a.
Testo completoFries, Aidan. "The use of Java in large scientific applications in HPC environments". Doctoral thesis, Universitat de Barcelona, 2013. http://hdl.handle.net/10803/98405.
Testo completoSummers, Fleur Elizabeth, e fleur summers@hotmail com. "Missing Links - Evolutionary theory as a model and scientific intervention as a strategy for artistic process and production". RMIT University. Art, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080619.121144.
Testo completoCorre, David. "Exploring the dawn of the universe with the Sino-French SVOM mission". Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0444/document.
Testo completoThis thesis lies within the framework of the sino-french SVOM (Space Variable Object Monitor) mission to be launched in 2021 whose objective is the detection and characterisation of Gamma-Ray Bursts (GRBs). The first part consists in the development of an end-to-end software for COLIBRI (Catching OpticaL and Infrared BRight transIents), a SVOM ground follow-up telescope. It consists in a GRB simulator, an Exposure Time Calculator, an image simulator and a photometric redshift algorithm. It allowed to estimate the telescope scientific performances to ensure that the optical design was fulfilling the scientific requirements. The relative accuracy on the photometric redshift delivered by COLIBRI is estimated to be about 10% and 15% for GRBs at 3.5 < z < 8 et z > 8. The second part of the thesis deals mainly with the study of dust properties in GRB host galaxies, but also with the star formation activity in these galaxies. We compare extinction curves measured along the GRB line of sight for 7 GRBs to the attenuation curve of their host galaxies measured with CIGALE, a SED fitting code. By comparing these curves to the results of a radiative transfer code, we obtain information about the geometrical distribution of dust and stars in these galaxies. On a larger sample of 23 galaxies, we show that the steepest (flattest) attenuation curves are associated to galaxies with a large (small) amount of dust attenuation, less (more) active in star formation and less (more) massive galaxies
Losik, Len. "Results from the Prognostic Analysis Completed on the NASA EUVE Satellite to Measure Equipment Mission Life". International Foundation for Telemetering, 2011. http://hdl.handle.net/10150/595790.
Testo completoThis paper addresses the research conducted at U.C. Berkeley Space Sciences Laboratory, Center for Extreme Ultra Violet Astrophysics between 1994 and 1995 on the NASA EUVE ion-orbit satellite. It includes the results from conducting a scientific analysis called a prognostic analysis completed on all satellite subsystem equipment. A prognostic analysis uses equipment analog telemetry to measure equipment remaining usable life. The analysis relates equipment transient behavior, often referred to as "cannot duplicates" in a variety of industries caused from accelerated aging to the equipment end-of-life with certainty. The analysis was confirmed by using proprietary, pattern recognition software by Lockheed Martin personnel Lockheed Martin personnel completed an exploration into the application of statistical pattern recognition methods to identify the behavior caused from accelerated aging that experts in probability reliability analysis claims cannot exist. Both visual and statistical methods were successful in detecting suspect accelerated aging and this behavior was related to equipment end of life with certainty. The long-term objective of this research was to confirm that satellite subsystem equipment failures could be predicted so that satellite subsystem and payload engineering personnel could be allocated for only the time that equipment failures were predicted to occur, lowering the cost of mission operations. This research concluded that satellite subsystem equipment remaining usable life could be measured and equipment failures could be predicted with certainty so that engineering support for mission operations could be greatly reduced.
Lacombe, Karine. "Réalisation de grands plans de détection pixélisés pour l'astronomie gamma : contribution à l'étude et à la réalisation du module XRDPIX pour l'instrument ECLAIRs sur la mission spatiale SVOM". Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30326.
Testo completoECLAIRs, the hard X-ray imager of the Chinese-French SVOM mission, is dedicated to the detection and localization in near real-time of cosmic transient sources in the energy range from 4 to 150 keV. This instrument is a wide field camera, equipped with a detection plane paved with 6400 CdTe Schottky detectors, which allows to create hard X-ray images of the sky thanks to a localization system called "coded mask". The work presented in this manuscript details the design, the realization and the measurement of the performances of hybrid modules of 32 detectors read by an ASIC (called XRDPIX modules), which constitute the basic bricks of the detection plan, and which make it possible to reach unequalled performances for this type of instrument with a threshold in energy equal to 4 keV. After having posed the problem of detection of transient cosmic sources in X-rays, based on the astrophysical context of the SVOM mission, and then detailed its main instrument, I present, in this thesis, my work on the realization of large pixelated detection plans for gamma-ray astronomy, with in particular my contribution to the study and the realization of the XRDPIX module. The development of the XRDPIX modules, calls for both a low noise design and the use of innovative technologies. The CdTe detectors are biased down to -450V and regulated at low temperature (nominally 20°C) in order to minimize the leakage current and to limit the polarization effects. The low energy threshold required for the space mission is reached thanks to a thorough characterization of the elements constituting the 200 flight XRDPIX, which form the ECLAIRs camera. I present in detail the physical and technological characteristics of these modules, the various stages of their development, justifying the solutions and technical compromises that have marked their manufacture. Then, based on an abundant statistical sample, obtained during the numerous tests and qualifications carried out on several hundreds of modules and sub-modules, I present the results of measurements which demonstrate the excellent performances of the XRDPIX module, in terms of spectral resolution, low energy threshold, gain and counting. Additional studies are also shown, in order to complete the validation of the XRDPIX by analyzing the influence of various physical parameters on the performances, such as temperature. In conclusion, thanks to these abundant data analyses, and to models of the total equivalent noise, I propose optimal settings for two key configuration parameters: the bias value for the high voltage and the peaking time, which allow to obtain the 4 keV energy threshold required by the SVOM mission, with a good uniformity on the whole detection plane. Finally, I present this feedback, coupled with the study of the key parameters that determine the sensitivity of a wide field imager in the hard X-ray domain (detection area, energy range, field of view, ...), which leads me to propose avenues for the realization of ambitious instruments with significant gains in sensitivity in the future
Lock, Gavin David. "Mission as relationship : an analysis of trends in both the pastoral and scientific context in relation to the Missio Dei". 2002. http://hdl.handle.net/10500/17222.
Testo completoChristian Spirituality, Church History and Missiology
M. Th. (Missiology)
Lock, Gavin David. "Mission as relationship: an analysis of trends in both the pastoral and scientific context in relation to the missio dei". Diss., 2003. http://hdl.handle.net/10500/973.
Testo completoAronica, Alessandro. "La missione ESA-Rosetta: obiettivi scientifici e aspetti della missione". Tesi di dottorato, 2009. http://www.fedoa.unina.it/3824/1/Aronica.pdf.
Testo completoLaufer, René [Verfasser]. "Lunar mission BW1: scientific objectives and small satellite concept = Lunar-Mission BW1: wissenschaftliche Zielsetzung und Kleinsatellitenkonzept / by René Laufer". 2010. http://d-nb.info/1009447181/34.
Testo completoPONTECORVO, MARIA ELENA. "Scienza dentro e fuori: modelli di produzione e trasmissione del sapere scientifico nella società della conoscenza". Doctoral thesis, 2012. http://hdl.handle.net/11573/916956.
Testo completoLANZILLO, LUCA. "Comunicazione scientifica e trasferimento della conoscenza nelle scienze umane: processi, indicatori e metriche fondamentali". Doctoral thesis, 2017. http://hdl.handle.net/11573/1003734.
Testo completo