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Dissertations / Theses on the topic 'Ion clouds'
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Donald, Charles. "Development of an ion trap quantum information processor." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365800.
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Lunney, Matthew David Norwood. "The phase space volume of ion clouds in Paul traps." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39462.
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A new technique is presented for measuring the spatial and momentum distributions of a buffer-gas cooled ion cloud in a Paul trap by extracting it from the trap and fitting the time profile of the extracted ion signal. A thermodynamic model based on the Gibbs distribution has been developed which describes the initial ion cloud phase space volume and fits the measured time distributions of the extracted cloud using only one parameter: temperature. A time-of-flight system has been built to systematically vary the ion extraction conditions and compare predictions of the model to various measurements of the ion cloud time profile. A new numerical method using a multipole expansion was developed to compute the extraction fields. Agreement between the ion simulations and the time-of-flight data is better than 2% of the total flight time.Ion cloud temperatures were measured for seven different trap loadings of potassium ions and four loadings of sodium ions, in both cases down to clouds of about 1000 ions. This is the first time that temperature measurements have been made for such small numbers of buffer-gas cooled ions. The results show that the temperature of the ions above the buffer gas temperature appears to be proportional to the two-thirds power of the number of ions in the cloud.
Dynamic manipulation of the extracted ion cloud phase space volume was also accomplished using a time-varying acceleration voltage to change the ion cloud energy spread in flight.
A concept is also outlined to measure the detailed phase space area of the extracted cloud using the projection-slice theorem of tomographic imaging.
These measurements have applications for the use of ion traps as beam collectors for nuclear physics experiments at isotope separator facilities and possibly for nano-circuit fabrication.
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Cazan, Radu Mircea [Verfasser]. "Preparation of cold Mg+ ion clouds for sympathetic cooling of highly charged ions at SPECTRAP / Radu Mircea Cazan." Mainz : Universitätsbibliothek Mainz, 2012. http://d-nb.info/1021243302/34.
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Petrie, Simon Antony Hudson. "A selected-ion flow tube study of some gas-phase ion-molecule reactions of potential relevance to the chemistry of dense interstellar clouds." Thesis, University of Canterbury. Chemistry, 1991. http://hdl.handle.net/10092/7253.
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Results are reported for the studies of several systems of ion-molecule reactions of potential relevance to the chemistry of interstellar clouds. Measurements were obtained using a selected-ion flow tube operated at room temperature (300 ± 5 K) and using helium buffer gas at a pressure of 0.30 ± 0.01 Torr.
The proton affinities of C₄H₂ and C₂N₂ were determined by measurement of the rate coefficients for forward and reverse proton transfer reactions involving compounds of similar proton affinity. The results obtained were P A(C₂N₂) = 674 ± 4 kJ mol-¹ and PA(C₄H₂) = 741 ± 4 kJ mol-¹: this latter quantity is significantly below the literature value, based on an earlier measurement obtained from ICR bracketing.
Isomerism of the ions C₂N⁺, C₃N⁺, CHN⁺ and CH₂N⁺ was investigated, using reactivity with various neutrals to distinguish between isomers. The ions CCN⁺/CNC⁺ and CCCN⁺/c-C₃N⁺ were distinguished on the basis of their reactivity with H₂: in both instances, the isomer featuring a terminal N atom reacted rapidly while the other isomer was unreactive. Identification of the isomers HCN⁺/HNC⁺ was complicated by the occurrence of tautomerisation of HCN⁺ to the more stable isomer HNC⁺ by the mechanism of 'forth and back' proton transfer which occurred with several neutral reagents: reaction with CF₄ was subsequently used to distinguish between these isomers, since HCN⁺ reacted rapidly with CF₄ while HNC⁺ was unreactive. The reactions of all of these isomeric systems were examined with several neutrals abundant in interstellar clouds. The ions HCNH⁺ and CNH₂⁺ could not be distinguished on the basis of reactivity with the neutrals surveyed: we cannot exclude the possibility that only one of these isomers, HCNH⁺, was formed using the ion producing methods used.
The reactivity of several ions C₃HnN⁺ (n = 1 → 4) and C₃HnO⁺ (n = 0 → 3), with various neutrals, was investigated to ascertain the importance of these ions in the interstellar synthesis of acrylonitrile, tricarbon monoxide and propynal. Several ion-molecule reactions of CH₂CHCN were also studied to this end. The results indicate that C₃HnN⁺ (n > 0) and C₃HnO⁺ (n > 0) are unreactive with the most prominent cloud constituents H₂ and CO; thus dissociative recombination of these ions should represent a significant source of the target molecules. Several ion-molecule reactions of the types X⁺ + CH₂HCN, and C₃nN⁺ + X, produce ions which, on dissociative recombination, are expected to yield cyanopolyynes and cyclopropenylidene. Several reactions of the C₃HnO+ ions suggest pathways to higher-order polycarbon monoxides and dioxides.
The reactivity of the molecular ions of C₂N₂, C₄N₂ and C₃0₂ have also been studied, to gauge the likely consequences of reactions of such ions within interstellar clouds.
The thermochemistry of the reaction HCN⁺ + CF4₄ → CF₃⁺ + HF + CN is explored with regard to the proposal that this reaction may be 'entropy-driven'.
The interstellar significance of a novel class of neutral-neutral reactions has been considered.
The reactivity of the ions C₄Hn⁺ (n = 0 → 4), C₃HnN⁺ (n = 0 → 4), and C₃HnO⁺ (n = 0 → 3) with the neutrals H₂, CO, C₂H₂ and HCN is discussed in greater detail.
Previous studies have determined that ions featuring linear carbon-chain skeletons are more reactive with H₂ and with CO if they feature 'bare' (non-hydrogenated) terminal carbon atoms: the present study suggests that ions with bare terminal C atoms are also more reactive than ions where the terminal atom is N or 0 rather than C. This observation may be explained by the degree of carbene character evident in such ions. These results are also discussed with reference to the predominance of very highly unsaturated linear molecules within interstellar clouds.
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Steinmann, Jochen [Verfasser], and Günter [Gutachter] Zwicknagel. "Analytical and numerical investigations of resistive cooling of trapped ion clouds / Jochen Steinmann ; Gutachter: Günter Zwicknagel." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2016. http://d-nb.info/1117220524/34.
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Young, Gillian. "Understanding the nucleation of ice particles in polar clouds." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/understanding-the-nucleation-of-ice-particles-in-polar-clouds(4f80f81b-ed06-480a-944b-6e3594ba8471).html.
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Arctic clouds are poorly represented in numerical models due to the complex, small-scale interactions which occur within them. Modelled cloud fractions are often significantly less than observed in this region; therefore, the radiative budget is not accurately simulated and forecasts of the melting cryosphere are fraught with uncertainty. Our ability to accurately model Arctic clouds can be improved through observational studies. Recent in situ airborne measurements from the springtime Aerosol-Cloud Coupling and Climate Interactions in the Arctic (ACCACIA) campaign are presented in this thesis to improve our understanding of the cloud microphysical interactions unique to this region. Aerosol-cloud interactions - where aerosol particles act as ice nucleating particles (INPs) or cloud condensation nuclei (CCN) - are integral to the understanding of clouds on a global scale. In the Arctic, uncertainties caused by our poor understanding of these interactions are enhanced by strong feedbacks between clouds, the boundary layer, and the sea ice. In the Arctic spring, aerosol-cloud interactions are affected by the Arctic haze, where a stable boundary layer allows aerosol particles to remain in the atmosphere for long periods of time. This leads to a heightened state of mixing in the aerosol population, which affects the ability of particles to act as INPs or CCN. Aerosol particle compositional data are presented to indicate which particles are present during the ACCACIA campaign, and infer how they may participate in aerosol-cloud interactions. Mineral dusts (known INPs) are identified in all flights considered, and the dominating particle classes in each case vary with changing air mass history. Mixed particles, and an enhanced aerosol loading, are identified in the final case. Evidence is presented which suggests these characteristics may be attributed to biomass burning activities in Siberia and Scandinavia. Additionally, in situ airborne observations are presented to investigate the relationship between the Arctic atmosphere and the mixed-phase clouds - containing both liquid cloud droplets and ice crystals - common to this region. Cloud microphysical structure responds strongly to changing surface conditions, as strong heat and moisture fluxes from the comparatively-warm ocean promote more turbulent motion in the boundary layer than the minimal heat fluxes from the frozen sea ice. Observations over the transition from sea ice to ocean show that the cloud liquid water content increases four-fold, whilst ice crystal number concentrations, N_ice, remain consistent at ~0.5/L. Following from this study, large eddy simulations are used to illustrate the sensitivity of cloud structure, evolution, and lifetime to N_ice. To accurately model mixed-phase conditions over sea ice, marginal ice, and ocean, ice nucleation must occur under water-saturated conditions. Ocean-based clouds are found to be particularly sensitive to N_ice, as small decreases in N_ice allow glaciating clouds to be sustained, with mixed-phase conditions, for longer. Modelled N_ice also influences precipitation development over the ocean, with either snow or rain depleting the liquid phase of the simulated cloud.
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Axelsson, Markus, and Oskar Lundgren. "Raytelligent Cloud." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-33567.
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I dagens samhälle blir fler och fler enheter uppkopplade mot Internet vilket kan ge en annars begränsad hårdvara möjlighet att genomföra större beräkningar. Detta projekt avser att skapa ett system som hanterar en användares radarenheter i ett molnbaserat system. Systemet erbjuder även möjligheten att ladda upp användarens egna applikationer vilka använder data från radarenheten, körs på virtuella maskiner och vid behov har möjlighet att skicka notiser till användarens mobila applikationer. För att underlätta utveckling har systemet delats upp i tre delsystem. Dessa är radarenhet, molntjänst och mobilapplikation. Projektet resulterade i ett komplett system med en webbapplikation som erbjuder användaren möjlighet att registrera sina radarenheter, ladda upp källkod som kompileras och körs på en molntjänst samt möjlighet att skicka notiser till en mobilapplikation.Todays age sees more and more devices connected to the internet providing otherwise quite limited hardware with the ability to perform more complex calculations. This project aims to create a system for managing a users radar devices using a cloud platform. The system also provides the ability for the user to upload their own custom applications which can make use of data provided by the radar device, run on virtual machines and if required have the ability to push notifications to the users mobile applications. To simplify the system development, it has been divided into three separate subsystems, specifically the radar device, the cloud service and the mobile application. The result of the project is a complete system with a web application which provides the user with the ability to register their radar device(s), upload source code which is compiled and run on the cloud platform and the ability to send push notices to a mobile application.
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Chang, Ouliang. "Numerical Simulation of Ion-Cyclotron Turbulence Generated by Artificial Plasma Cloud Release." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/34018.
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Possibilities of generating plasma turbulence to provide control of space weather processes have been of particular interest in recent years. Such turbulence can be created by chemical released into a magnetized background plasma. The released plasma clouds are heavy ions which have ring velocity distribution and large free energy to drive the turbulence. An electromagnetic hybrid (fluid electrons and particle ions) model incorporating electron inertia is developed to study the generation and nonlinear evolution of this turbulence. Fourier pseudo-spectral methods are combined with finite difference methods to solve the electron momentum equations. Time integration is accomplished by a 4th-order Runge-Kutta scheme or predicator-corrector method. The numerical results show good agreement with theoretical prediction as well as provide further insights on the nonlinear turbulence evolution. Initially the turbulence lies near harmonics of the ring plasma ion cyclotron frequency and propagates nearly perpendicular to the background magnetic field as predicted by the linear theory. If the amplitude of the turbulence is sufficiently large, the quasi-electrostatic short wavelength ion cyclotron waves evolve nonlinearly into electromagnetic obliquely propagating shear Alfven waves with much longer wavelength. The results indicate that ring densities above a few percent of the background plasma density may produce wave amplitudes large enough for such an evolution to occur. The extraction of energy from the ring plasma may be in the range of 10-15% with a generally slight decrease in the magnitude as the ring density is increased from a few percent to several 10's of percent of the background plasma density. Possibilities to model the effects of nonlinear processes on energy extraction by introducing electron anomalous resistivity are also addressed. Suitability of the nonlinearly generated shear Alfven waves for applications to scattering radiation belt particles is discussed.Master of Science
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Martello, Rosanna. "Cloud storage and processing of automotive Lithium-ion batteries data for RUL prediction." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
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Lithium-ion batteries are the ideal choice for electric and hybrid vehicles, but the high cost and the relatively short life represent an open issue for automotive industries. For this reason, the estimation of battery Remaining Useful Life (RUL) and the State of Health (SoH) are primary goals in the automotive sector. Cloud computing provides all the resources necessary to store, process and analyze all sensor data coming from connected vehicles in order to develop Predictive Maintenance tasks. This project describes the work done during my internship at FEV Italia s.r.l. The aims were designing an architecture for managing the data coming from a vehicle fleet and developing algorithms able to predict the SoH and the RUL of Lithium-ion batteries. The designed architecture is based on three Amazon Web Services: Amazon Elastic Compute Cloud, Amazon Simple Storage Service and Amazon Relational Database Service. After data processing and the feature extraction, the RUL and SoH estimations are performed by training two Neural Networks.
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Gamelin, Alexis. "Collective effects in a transient microbunching regime and ion cloud mitigation in ThomX." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS276/document.
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La thèse est axée sur l'étude des effets collectifs dans un anneau de stockage d'électrons de 50 MeV, ThomX, en l'absence d'amortissement synchrotron et d’adaptation longitudinale. Cette thèse est divisée en deux parties distinctes. La première partie correspond à la conception du modèle d'impédance (champ de sillage géométrique, résistif et rayonnement synchrotron cohérent) de l'anneau de stockage afin de simuler la dynamique faisceau. Le modèle d'impédance géométrique de l'anneau de stockage a été obtenu par la simulation des éléments individuels et a été vérifié en utilisant des mesures RF sur des prototypes. Le rayonnement synchrotron cohérent a été simulé en tenant compte d'une chambre à vide rectangulaire. Des simulations de la dynamique faisceau, de la cathode de canon RF à l'anneau de stockage, comprenant les effets collectifs sont présentées. Les simulations sont utilisées pour optimiser la dynamique faisceau dans l'anneau de stockage dans le régime de micro-paquet. La deuxième partie concerne l'étude du nuage d'ions produit par l'ionisation des molécules du vide résiduel et l'optimisation des techniques de nettoyage des ions. Les points d'accumulation longitudinaux des ions et le piégeage dans les champs magnétiques sont tous les deux étudiés analytiquement et en utilisant un programme développé à cet effet. Les électrodes de nettoyage et les espaces de nettoyages sont simulés et optimisés en utilisant ce code et la stratégie choisie pour la limitation des effets induits par les ions est décrite. Enfin, les effets de la multi-ionisation et de la dissociation ionique sont pris en compte et l'effet des ions sur le faisceau d'électrons est estiméThe thesis is focused on the study of collective effects in a 50 MeV electron storage ring, ThomX, in the absence of synchrotron radiation damping and of longitudinal matching. This thesis is divided in two distinct parts. The first part corresponds to the design of the impedance model (geometric and resistive wakefields, coherent synchrotron radiation) of the storage ring in order to simulate the beam dynamics. The geometric impedance model of the storage ring was obtained via simulation of the individual elements and was checked using wire measurements on prototypes. The coherent synchrotron radiation was simulated taking into account a rectangular vacuum chamber. Beam dynamics simulations, from the RF gun cathode to the storage ring, including collective effects are presented. The simulations are used to optimise the beam dynamics in the storage ring in the micro-bunching regime. The second part is the study of the ion cloud produced by the ionisation of the residual vacuum molecules and the optimisation of the ion clearing techniques. The longitudinal ion accumulation points and the trapping in magnetic fields are both studied analytically and by using a tracking code developed for this purpose. Clearing electrodes and clearing gaps are simulated and optimised using this code and the strategy chosen for the limitation of ion induced effects is described. Finally, the effect of multi-ionisation and ion dissociation is taken into account and the ion effect on the electron beam is estimated
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Brown, Michael S. "Lifetimes and oscillator strengths for ultraviolet transitions in singly ionized copper /." Conect to full text in OhioLINK ETD Center, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=toledo1234986660.
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Thesis (M.S.)--University of Toledo, 2009.Typescript. " As partial fulfillment of the requirements for the Master of Science in Physics." "A thesis entitled"--at head of title. Bibliography: leaves 21-22.
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Kaiser, Nathan Kenneth. "Fourier transform ion cyclotron resonance mass spectrometry instrumentation design and development reduction of ion cloud de-phasing and time-of-flight discrimination /." Online access for everyone, 2007. http://www.dissertations.wsu.edu/Dissertations/Fall2007/n_kaiser_120207.pdf.
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Bakthavathsalu, Lalith Kumar. "Cloud native design of IoT baseband functions : Introduction to cloud native principles." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-289171.
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The exponential growth of research and deployment of 5G networks has led to an increased interest in massive Machine Type Communications (mMTC), as we are on the quest to connect all devices. This can be attributed to the constant development of long-distance and low-powered Internet-of- Things (IoT) technologies, or, Low Power Wide Area Network (LPWAN) technologies such as Long-Range (LoRa) and Narrow Band- IoT (NB-IoT). These technologies are gaining prominence in the IoT domain as the number of LPWAN connected devices has doubled from 2018 to 2019. This increase in devices warrants a proportional number of gateways to push the data to the Internet for further analytics. The traditional LPWAN architectures do not provide dynamic scaling of resources or energy-efficient solutions. Thus, a Cloud-Native (CN) split architecture based on the functional characteristics of the components is a necessity. In this work, a software-based implementation of the LoRa stack on GNU Radio is designed and implemented using Software-Defined Radio (SDR). The LoRa gateway is implemented in software completely, replicating the functions of the hardware for communicating with any LoRa Network Server. Several experiments with different setups have been performed on the testbed to measure the resource utilization and packet delay of the LoRa Physical (PHY) and Medium Access Control (MAC) layers. Also, the testbed has been moved into Docker containers to emulate a cloud-based platform and make the transition faster. Higher throughput and lower delay (Improvement in the range of 1.3x - 6.7x) were recorded upon splitting the testbed into Radio Head (RH) and Edge containers. Finally, three potential functional split architectures including the gateway have been discussed while providing a fair trade-off between pooling gain and consumed bandwidth for a CN split architecture.Den exponentiella tillväxten av forskning och distribution av 5G-nät har lett till ett ökat intresse för massive Machine Type Communicationsn (mMTC) eftersom vi är på jakt att ansluta alla enheter. Detta kan tillskrivas den ständiga utvecklingen av långdistans- och lågdrivna Internet-of-Things-teknologier (IoT) -teknologier, eller, Low Power Wide Area Network (LPWAN) tekniker som Long-Range (LoRa) och Narrow Band- IoT (NB-IoT). Dessa teknologier blir framträdande inom IoT-domänen eftersom antalet LPWAN-anslutna enheter har fördubblats från 2018 till 2019. Denna ökning av enheterna motiverar ett proportionellt antal portar för att driva data till Internet för ytterligare analys. De traditionella LPWAN-arkitekturerna ger inte dynamisk skalning av resurser eller energieffektiva lösningar. Således är en moln-infödd delad arkitektur baserad på funktionernas egenskaper hos komponenterna en nödvändighet. I detta arbete designas och implementeras en programvarubaserad implementering av LoRa-stacken på GNU Radio med hjälp av Software- Defined Radio (SDR). LoRa-gatewayen implementeras i mjukvara fullständigt, vilket replikerar maskinvarans funktioner för att kommunicera med någon LoRaNetwork Server. Flera experiment med olika inställningar har utförts på testbädden för att mäta resursutnyttjandet och paketfördröjningen för LoRa Physical (PHY) och Medium Access Control (MAC) -skikten. Testbädden har också flyttats in i Docker-behållare för att emulera en molnbaserad plattform och göra övergången snabbare. Högre genomströmning och lägre fördröjning (Förbättring inom intervallet 1,3x - 6,7x) registrerades vid uppdelning av testbädden i Radio Head (RH) och Edge containrar. Slutligen har tre potentiella funktionella splitarkitekturer inklusive gateway diskuterats samtidigt som det ger en rättvis avvägning mellan pooling av vinst och förbrukad bandbredd.
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Laukka, Lucas, and Carl Fransson. "Cloud risk analysis using OCTAVE Allegro : Identifying and analysing risks of a cloud service." Thesis, Linköpings universitet, Institutionen för datavetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-176731.
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Cybersecurity is currently an important and relevant issue, as more and more industries are taking advantage of the accessibility of storing information online. To create a secure system one must know the potential risks and attacks on that system, making risk analysis a very potent tool. In this study, we performed such an analysis using the risk analysis method OCTAVE Allegro on a company providing a cloud-based service to find out what risks a cloud service provider might be exposed to, and the usefulness of said risk analysis method in this circumstance. We found that OCTAVE Allegro is suitable to use on smaller companies and applicable to cloud services, and the most severe risks identified were connected to leakage of client data with a consequence of damaging the company's reputation. Common areas of concern for these risks were third parties hacking the cloud server or other company systems to gain access to sensitive information. Such risks will likely be found at any company providing a cloud service that manages sensitive data, increasing the importance of risk analysis at these companies.
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Kulesa, Craig A. "Molecular hydrogen and its ions in dark interstellar clouds and star forming regions." Diss., The University of Arizona, 2002. http://hdl.handle.net/10150/280192.
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Fundamental observations of molecular hydrogen (H₂) in dark clouds, star forming regions, and radiation-dominated environments are presented, modeled, and interpreted. Through a weak infrared absorption line spectrum, the abundance of cold H₂ in dark molecular clouds and star forming regions is measured directly and compared with the abundance of its most commonly cited surrogate, CO. The derived abundance of CO is between 1.5 and 2.5 x 10⁻⁴ for the sample. The CO molecule thus represents about ⅓ of the total carbon budget in dense clouds. Also detected via infrared line absorption is the pivotal molecular ion H⁺₃ , yielding a direct measure of the cosmic ray ionization rate of H₂ in dark molecular clouds (between 1 and 5 x 10⁻¹⁷ s⁻¹), a process that instigates the complex ion-neutral chemical pathways that form many of the 120+ known molecular species deep inside interstellar clouds. These timely tests of theory are applied to the detailed submillimeter-wave study of the ρ Ophiuchi star forming cloud and photodissociation front, allowing partial disentanglement of the complicated physical and chemical structure of a star forming cloud. Yet H₂ and H⁺₃ continue to surprise and delight us with more mysteries. The formation, excitation and survival of molecules in unusual & hostile environments is highlighted by the discoveries of H⁺₃ in circumstellar disks of early-type stars, and of fluorescing H₂ in two harshly-irradiated filaments of the Crab Nebula. The role of H⁺₃ as a possible tracer of planet formation, and the evolution of H₂ in the interstellar medium is discussed. The study of H₂ in hostile environments is extended to the ensemble properties of extragalactic star forming regions, and applied to the Arp 299 merger system as a unique probe of the feedback of newly-formed hot stars, their fossil remains, and the molecular material which formed them.
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Kamsap, Marius Romuald. "Horloge micro-onde à ions : analyse et transport d'un nuage d'ions dans un piège à plusieurs zones." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4781/document.
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Cette thèse a été effectuée dans le cadre d'un projet qui vise à explorer les facteurs limitants des performances d'une horloge à ions dans le domaine des fréquences micro-onde. Ce travail repose sur l'observation et la manipulation d'un grand nuage d'ions dans des potentiels de géométries différentes. Le but est l'analyse et le transport d'un grand nuage pouvant dépasser 10^6 ions dans un piège radio-fréquence linéaire à plusieurs zones. Notre groupe à construit un piège à trois zones destiné au piégeage d'ions calcium: deux parties quadrupolaires et une partie octupolaire montées en ligne. Les ions sont créés dans la première partie quadrupolaire et refroidis par laser le long de l'axe du piège. Nous avons d'abord étudié la création d'un grand nuage. La limite actuelle des paramètres du système permet de confiner et détecter des nuages de taille maximale 1,2.10^5 ions. Ensuite, grâce à un protocole de transport rapide et optimisé, ces ions sont transportés dans le deuxième et troisième piège avec une efficacité pouvant atteindre 100%. Les résultats en fonction de la durée de transport montrent une asymétrie entre les deux sens de transport que nous exploitons pour ajouter des ions dans le deuxième piège sans perte du nuage initialement présent. Cette technique d'accumulation a permis de piégér 2,5.10^5 ions dans le deuxième et troisième piège. Ce nombre semble limité par les refroidissement. Enfin, dans l'octupole, les observations montrent que, contrairement aux structures creuses attendues par les modèles, les ions froids s'organisent dans trois minima locaux de potentiels. La cause de cette différence est un petit défaut dans la symétrie octupolaire des barreauxThis thesis is part of a project aiming to explore the performance limiting factors of a microwave ion clock. This work is based on the observation and manipulation of a large ion cloud in potentials with different geometries. The purpose is to analyze and transport a large cloud of more than 10^6 ions in a linear radio-frequency trap with several zones. Our group has build a three-zone trap for calcium ion trapping: two quadrupole parts and an octupole part mounted inline. Ions are created in the first quadrupole part and cooled by lasers along the trap symmetry axis. We study the creation of a large ion cloud. The current trapping and cooling parameters limit the maximum size of the cloud to 1,2.10^5 ions. with a rapid and optimized transport protocol, these ions are transfered in the second part of the trap and then in the octupole trap with an efficiency of up to 100%. The result as function of the transport duration shows an asymmetry between the two transport directions. We exploit this feature to add ions in the second or third trap without loss of the already trapped ions. This accumulation technique has allowed to trap 2,5.10^5 ions in the second and third trap. The cooling laser power seems to be the major limiting factor of this number. Finally the observation of the ions in the octupole shows that the cold ions are localised in three different potential wells. This is in contradiction with the hollow structure predicted by the analytical fluid model and molecular dynamics simulations. The cause of this difference is a tiny defect in the octupole symmetry of the RF-electrodes which leads to local minima in the multipole potential
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Sääf, Alexander. "Cloud Services for Building the Modern Internet of Things : An Examination of IoT Cloud Service Providers." Thesis, Linköpings universitet, Institutionen för datavetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-162090.
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As the IoT has grown in popularity, modern Cloud Providers have begun offering IoT-specific features. These features could provide IoT developers with a lot of aid, but they are new and relatively unexplored. This study aims to explore these IoT-specific features in order to build a better foundation for developers looking to leverage them to improve their IoT systems or development process. To do this, a literature study combined with a case study was carried out. The literature study gives insight into the current research around IoT and IoT cloud providers, for example with common issues and possible applications. The case study provides a reference of how a simple proof-of-concept system can be developed using two of the available providers: AWS IoT and Azure IoT.
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Vigren, Erik. "Dissociative recombination of organic molecular ions of relevance for interstellar clouds and Titan's upper atmosphere." Doctoral thesis, Stockholms universitet, Fysikum, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-43372.
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This thesis presents experimental studies on the dissociative recombination (DR) of the organic molecular ions CD3CND+, CH2CHCNH+, CH3CH2CNH+, CD3CDO+, CH3CHO+ and DCOOD2+. The experiments were all performed at the heavy ion storage ring CRYRING at the Manne Siegbahn Laboratory in Stockholm, Sweden. DR is the process in which a singly charged molecular cation captures a free electron, forming a highly excited intermediate molecule which then dissociates into exclusively neutral fragments. The process plays an important role as a plasma neutralizing mechanism in many cold, low density plasmas such as those encountered in planetary ionospheres and interstellar clouds. DR can also act as the final step in the gas-phase synthesis of different neutral molecules in such environments. Our experimental findings indicate that nitriles that are lost by protonation in Titan’s upper atmosphere or in interstellar clouds to a large extent may be recycled by DR. Also, it appears that the DR of nitrile ions does not break the C-N bond, which supports the hypothesis that nitriles which are formed in Titan’s upper atmosphere do not degrade to recover N2. For the studied acetaldehyde cations, CD3CDO+ and CH3CHO+, we observed a considerable isotopic effect in the cross section, with the lighter isotopologue being more reactive. In the DR of DCOOD2+ an upper limit of only 13% for the branching fraction of the DCOOD + D channel was found. This finding has pronounced effects on the predicted abundance of formic acid in dark clouds.
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Rodriguez, Romboli Luciano. "Internal characteristics of magnetic clouds and interplanetary coronal mass ejections." Katlenburg-Lindau : Copernicus GmbH, 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=976522861.
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Bhowmick, Satyajit. "A Fog-based Cloud Paradigm for Time-Sensitive Applications." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1467988828.
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Joel, Jaldemark. "Remote control of frequency inverter." Thesis, Högskolan i Halmstad, Akademin för informationsteknologi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-41400.
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Emotron has a frequency inverter on the market that different industries uses in their factories. In case of errors they need to send out service to the factories in order to examine the inverter and find the error. They now want a solution that makes it possible for them to give support without leaving the office by connecting their devices to the cloud which eliminates the need to send out staff to industries. Emotron gave this task to HMS and has been possible with their product Anybus wiress bolt. By connecting the Anybus wireless bolt to the inverter it was possible to communicate with the cloud, MicrosoftAzure, where a static webb application is hosted. The application is made to look like the terminal on the inverter and has similiar structures and functionality. Through the application users can communicate withthe inverter by means of controlling the connected motor, reading registers and also write to certain registers. These registers contain different measurement and option parameters. The purpose of this thesis was to create a Proof-of-Concept solution using the Anybus wireless bolt. The thesis has shown of industries can use Anybus wireless bolt and the tag engine to make it possible to create a link between machines and the ever- growing cloud and is also the first part of a bigger project.
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Sasaki, Manami. "X-rays tracing the star formation history of the Magellanic clouds." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=964798824.
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Wilhelm, Geoffrey. "Etude des interactions réseaux véhiculaires et Cloud." Thesis, Reims, 2018. http://www.theses.fr/2018REIMS032/document.
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Les réseaux véhiculaires sont des réseaux émergents qui permettent de connecter des véhicules entre eux et avec les infrastructures routières. Ils permettent de mettre en œuvre des applications de sécurité (évitement des collisions, prévention des travaux, etc.), des applications temps-réel (aide à la conduite automatisée), des applications des systèmes de transport intelligents (gestion du trafic, proposition de détours, etc.), des applications de confort (péage automatique des autoroutes, connexion à du contenu multimédia en ligne, etc.). Pour fonctionner pleinement, le véhicule a besoin d’une puissance de calcul de plus en plus grande et d’une connexion quasi-continue. Afin de garantir cette contrainte, les réseaux véhiculaires font de plus en plus appel au Cloud. Cette thèse vise à explorer les différentes interactions entre les réseaux véhiculaire et CloudVehicular Ad-hoc Networks (VANETs) are a new kind of networks which allow to connect vehicles between them and with the road infrastructures. It make possible to deploy safety applications (colision avoidance, roadworks advertisement, etc.), real time application (driver assistance, automated driving, etc.), comfort application (automatic toll payment, access to multimedia contents via internet, etc.). In order to be functioning completely, the vehicle needs more and more computing power and a connection with almost no interruption. To guarantee this constraints, VANETs are using more and more often the Cloud Computing. This thesis aims to explore the differents intereactions between VANETs and the Cloud
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Nompleggio, Pietro Antonio. "Computazione Embodied e Disembodied: Cloud-based IoT." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/11180/.
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La tesi esplora la co-esistenza di computazioni embodied e disembodied nei moderni sistemi software, adottando come caso di studio il recente trend che vede sempre più coesi e integrati sistemi per l'Internet of Things e sistemi Cloud-based. Si analizzano i principali modelli di comunicazione, protocolli di comunicazione e architetture situate. Inoltre si realizza una piattaforma IoT Middleware cloud-based per mostrare come la computazione possa essere distribuita lato embodied e disembodied.
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Ferreira, Elisa Merkel. "Star formation in the Magellanic Clouds based on 1.2 mm continuum observations." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972090940.
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Ward, Daniel R. "Reaper – Toward Automating Mobile Cloud Communication." ScholarWorks@UNO, 2013. http://scholarworks.uno.edu/td/1707.
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Mobile devices connected to cloud based services are becoming a mainstream method of delivery up-to-date and context aware information to users. Connecting mobile applications to cloud service require significant developer effort. Yet this communication code usually follows certain patterns, varying accordingly to the specific type of data sent and received from the server. By analyzing the causes of theses variations, we can create a system that can automate the code creation for communication from a mobile device to a cloud server. To automate code creation, a general pattern must extracted. This general solution can then be applied to any database configuration. Automating this process frees up valuable development time, allowing developers to make other parts of the application and/or backend service a better experience for the end user.
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Hellbe, Anton, and Gustaf Bohlin. "Evaluating IoT cloud platforms in the context of smart buildings." Thesis, Malmö universitet, Fakulteten för teknik och samhälle (TS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-20027.
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Smarta byggnader är ett vanligt användningsområde för både Internet of Things (IoT)enheter och molntjänster. På senare tid har molntjänstleverantörer som Amazon, Googleoch Microsoft börjat erbjuda IoT-molnplattformar. Dessa består av en klass av tjänstersom utgör en bas för molnapplikationer som används av IoT-enheter. Idag finns det mångaolika leverantörer som tillhandahåller denna tjänsten och att välja en för en IoT-lösning ärsvårt. I denna rapport beskrivs utvecklingen av ett system som är vanligt förekommandei en smart byggnad. I denna rapport utvärderas IoT-molnplattformar för användninginom området smarta byggnader som en del av ett uppdrag från Sigma Lundinova. Förutvärderingen implementeras ett vanligt scenario i en smart byggnad som en prototyp medhjälp av två olika IoT-molnplattformar. Syftet med detta är att utvärdera och jämföra hurväl IoT-molnplattformarna stödjer utveckling av systemet beskrivet av scenariot. Genomatt implementera en prototyp insamlas underlag i form av kunskap och erfarenhet somanvänds i utvärderingen. Utvärderingen kan användas som ett hjälpmedel för att göradet lättare att välja en IoT-molnplattform när man utvecklar IoT-lösningar för smartabyggnader.Smart buildings is a common application for both Internet of Things (IoT) devices andcloud services. Recently cloud service providers such as Amazon, Google and Microsofthave started to offer IoT cloud platforms which consist of a class of services that providea base for cloud applications utilized by IoT devices. However, there are many differentproviders of IoT cloud platforms and selecting one for an IoT solution for a smart buildingis difficult. In this thesis two IoT cloud platforms are evaluated in the context of smartbuildings as part of an assignment given by Sigma Lundinova. To evaluate the IoT cloudplatforms a common smart building scenario is realized by implementing a prototype usingtwo different IoT cloud platforms. The development process makes it possible to evaluatehow well the platforms support the development of the system that the scenario describes.The evaluation is based on information and experience from the process of developing thesystem using the IoT cloud platforms. The evaluation can be used as a guidance whenselecting IoT cloud platform for an IoT solution intended for a smart building.
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Winberg, André, and Ramin Alberto Golrang. "Analytics as a Service : Analysis of services in Microsoft Azure." Thesis, Karlstads universitet, Institutionen för matematik och datavetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-47655.
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Buchholz, Joachim. "Simulations of physics and chemistry of polar stratospheric clouds with a general circulation model." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=976096129.
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Ma, Kun. "Resource management in the cloud: An end-to-end Approach." University of Western Cape, 2020. http://hdl.handle.net/11394/7886.
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Philosophiae Doctor - PhDCloud Computing enables users achieve ubiquitous on-demand , and convenient access to a variety of shared computing resources, such as serves network, storage ,applications and more. As a business model, Cloud Computing has been openly welcomed by users and has become one of the research hotspots in the field of information and communication technology. This is because it provides users with on-demand customization and pay-per-use resource acquisition methods.
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Elva, Rochelle. "Detecting Semantic Method Clones in Java Code using Method IOE-Behavior." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5731.
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The determination of semantic equivalence is an undecidable problem; however, this dissertation shows that a reasonable approximation can be obtained using a combination of static and dynamic analysis. This study investigates the detection of functional duplicates, referred to as semantic method clones (SMCs), in Java code. My algorithm extends the input-output notion of observable behavior, used in related work [1, 2], to include the effects of the method. The latter property refers to the persistent changes to the heap, brought about by the execution of the method. To differentiate this from the typical input-output behavior used by other researchers, I have coined the term method IOE-Behavior; which means its input-output and effects behavior [3]. Two methods are defined as semantic method clones, if they have identical IOE-Behavior; that is, for the same inputs (actual parameters and initial heap state), they produce the same output (that is result- for non-void methods, and final heap state). The detection process consists of two static pre-filters used to identify candidate clone sets. This is followed by dynamic tests that actually run the candidate methods, to determine semantic equivalence. The first filter groups the methods by type. The second filter refines the output of the first, grouping methods by their effects. This algorithm is implemented in my tool JSCTracker, used to automate the SMC detection process. The algorithm and tool are validated using a case study comprising of 12 open source Java projects, from different application domains and ranging in size from 2 KLOC (thousand lines of code) to 300 KLOC. The objectives of the case study are posed as 4 research questions: 1. Can method IOE-Behavior be used in SMC detection? 2. What is the impact of the use of the pre-filters on the efficiency of the algorithm? 3. How does the performance of method IOE-Behavior compare to using only input-output for identifying SMCs? 4. How reliable are the results obtained when method IOE-Behavior is used in SMC detection? Responses to these questions are obtained by checking each software sample with JSCTracker and analyzing the results. The number of SMCs detected range from 0 45 with an average execution time of 8.5 seconds. The use of the two pre-filters reduces the number of methods that reach the dynamic test phase, by an average of 34%. The IOE-Behavior approach takes an average of 0.010 seconds per method while the input-output approach takes an average of 0.015 seconds. The former also identifies an average of 32% false positives, while the SMCs identified using input-output, have an average of 92% false positives. In terms of reliability, the IOE-Behavior method produces results with precision values of an average of 68% and recall value of 76% on average. These reliability values represent an improvement of over 37% (for precision) of the values in related work [4]. Thus, it is my conclusion that IOE-Behavior can be used to detect SMCs in Java code with reasonable reliability.Ph.D.
Doctorate
Computer Science
Engineering and Computer Science
Computer Science
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Sgarbi, Andrea. "Machine Cloud Connectivity: a robust communication architecture for Industrial IoT." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
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Industry 4.0 springs from the fourth industrial revolution, which is bringing innovation to fully automated and interconnected industrial production. This movement is composed of macro areas to expand the technological horizon starting from the tools used to date. The use of data, computing power and connectivity are the fundamental concepts on which the study of this thesis is based and are declined in big data, open data, Internet of Things (IoT), machine-to-machine and cloud computing for the centralization of information and its storage. Once the data has been collected, it is necessary to derive value from it in order to obtain advantages from ”machine learning”, i.e. machines that improve their performance by ”learning” from the data collected and analyzed.
The advent of the Internet of Things can be seen in all respects as the greatest technological revolution of recent years, which will bring a huge amount of information into the hands of users. The latter can offer countless advantages in daily life and in the diagnostics of the production process.
Industrial IoT (IIoT) enables manufacturing organizations to create a communication path through the automation pyramid, obtaining a real data stream in order to improve the machine performances. From an information security point of view, the importance of the information transmitted should not be underestimated and this also concerns an important aspect of industry 4.0. Protocols and authentication systems are constantly updated to ensure the privacy and security the customer needs.
Through this thesis project, the implementation requirements will be dealt with in order to study and analyze different vendor technologies and to construct a cloud architecture. The focus is concentrated on the cybersecurity and on the information losses avoidance in order to get a robust transfer.
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Celiz, Rodrigo Cubas, La Cruz Yasmin Escriba De, and David Mauricio Sanchez. "Cloud Model for Purchase Management in Health Sector of Peru based on IoT and Blockchain." Institute of Electrical and Electronics Engineers Inc, 2019. http://hdl.handle.net/10757/625219.
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Purchase management of medical supplies is a critical and important process that affects the services provision quality. Nonetheless, it is facing a growing pressure to provide visibility and traceability of the purchase, to reduce fraud, to improve flexibility and to ensure communication between everyone involved. Currently, private health institutions in Peru choose to implant different software products within the same company with restricted visibility access to other concerned parties and based on information from a single source. A new alternative is Blockchain technology, since it provides a single source of shared truth to all participants and ensures that the information cannot be altered, thus offering high levels of transparency that, together with IoT technology, creates not only visibility about where things are, but also traceability, showing the current state of things.Revisón por pares
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Grubitzsch, Philipp. "Intercloud-Kommunikation für Mehrwehrtdienste von Cloud-basierten Architekturen im Internet of Things." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-236210.
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Das Internet of Things (IoT) ist aktuell ein junger Wachstumsmarkt, dessen Bedeutung für unsere Gesellschaft in naher Zukunft vielen Menschen erst noch wirklich bewusst werden wird. Die Subdomänen Smart-Home, Smart-Grid, Smart-Mobility, Industrie 4.0, Smart-Health und viele mehr sind wichtig für unsere zukünftige Wettbewerbsfähigkeit, die Herausforderungen zur Bewältigung des Klimawandels, unsere Gesundheit, aber auch für trivialere Dinge wie Komfort. Andererseits ergibt sich hierbei bereits dasselbe große Problem, das in einer ähnlichen Form schon bei klassischem Cloud-Computing bekannt ist: Vendor-Silos, die keinen hersteller- oder anbieterübergreifenden Austausch von Gerätedaten ermöglichen, verhindern eine schnelle Verbreitung dieser neuen Technologie. Diensteanbieter müssen ihre Produkte aufwendig für unzählige Technologien bereitstellen, was die Entwicklung von Diensten unnötig teuer macht und letztendlich das Dienstangebot insgesamt einschränkt. Cloud-Computing wird dabei in Zukunft eine wichtige Rolle spielen.
Die Dissertation beschäftigt sich daher mit dem Problem IoT-Gerätedaten an IoT-Clouds plattformübergreifend und anbieterübergreifend nutzbar zu machen. Die Motivation und die adressierte Forschungslücke zeigen die Notwendigkeit der Beschäftigung mit dem Thema auf. Ausgehend davon, wird das Konzept einer dezentral organisierten IoT-Intercloud vorgeschlagen, welches in der Lage ist heterogene IoT-Clouds zu integrieren. Die Analyse des Standes der Technik zeigt, das IoT-Clouds genügend Eigenschaften teilen, um in Zukunft eine Adaption zu einer einheitlichen Schnittstelle für die IoT-Intercloud zu schaffen. Das Konzept umfasst zunächst die Komponentenarchitektur eines Intercloud-Brokers zur Etablierung einer IoT-Intercloud. Ausgehend davon wird in vertiefenden Teilkonzepten ein Discovery-Service zum Finden von Gerätedaten und einem Push-Stream-Provider, für die Zustellung von IoT-Event-Notifications in Echtzeit, behandelt. Eine Evaluation zeigt letztlich die praxistaugliche Realisierbarkeit, Skalierbarkeit und Performance der Konzeption und des implementierten Prototyps.
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Laube, Martin, Andreas Günder, Jan Bierod, Volker Jesberger, and Stefan Rauch. "Cytroconnect – a cloud-based IOT-service as connectivity solution for electrohydraulic systems." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71189.
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Conventional electrohydraulic solutions integrate easily into modern machine concepts by utilizing field bus technology. Nevertheless, most use cases are limited to machine automation concepts. Integration into higher-level data and IoT systems is the key for positioning of electrohydraulic solutions within the factory of the future. CytroConnect is a new approach for the integration of electrohydraulic systems into IoT environments and the corresponding market offerings. Bosch Rexroth decided not only to integrate IoT-ready features like pre-installed sensor packages but also a modular automation concept providing decentralized intelligence with an open multi-ethernet interface. An edge-to-cloud connectivity stack operated by Bosch turns the target into a Connected Product. The convergence of physical and digital product can be realized. Based on that the digital service CytroConnect solves concrete holistic use cases like visualization and condition monitoring by offering a web-based dashboard of all relevant sensor data that is accessible everywhere. Modular paid add-ons offered as risk-free monthly subscriptions address further smart maintenance and prediction use cases.
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Luna, Renato Mercado, Gabriel Benavente Soto, Daniel Subauste Oliden, and Alfredo Barrientos Padilla. "Bike-Sharing Management System Using IoT." Universidad Peruana de Ciencias Aplicadas (UPC), 2021. http://hdl.handle.net/10757/653779.
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El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado.Nowadays, due to climate change and many other facts affecting daily life a trend to use eco-friendly transportation ways has arisen, and from them the one mostly used and with the highest acceptance is biking. Therefore, several companies have emerged offering bike-sharing systems, and those systems have been greatly accepted in the different metropolises around the world. The generalization of these systems has created a new need: to manage them efficiently. Consequently, in this work, we propose a software architecture and the implementation of a bike-sharing management system using the Internet of things (IoT).
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Schulte, Marius [Verfasser]. "Entanglement in Ramsey interferometry, optical atomic clocks and trapped ions / Marius Schulte." Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2020. http://d-nb.info/1226286194/34.
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Schiavi, Daniele. "Progettazione e prototipazione di una piattaforma cloud ibrida per il monitoraggio della salute." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23158/.
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La tesi tratta la progettazione di un'architettura di riferimento e lo sviluppo prototipale di una piattaforma per la raccolta di dati sanitari, relativi a diversi pazienti, attraverso l'utilizzo di dispositivi commerciali eterogenei, per poi renderli disponibili attraverso un modello standard per diverse tipologie di utilizzo. Nei primi capitoli viene illustrato lo studio effettuato sulla telemedicina ed in particolare sul telemonitoraggio, definendo il quadro di contesto nel quale è situata la tesi. Successivamente sono illustrati i requisiti ed una loro fase di analisi che hanno guidato la progettazione dell'architettura. Infine si è sviluppato un prototipo di una piattaforma basata sull'architettura realizzata per validarla, calandola in un caso d'uso reale, e verificarne la fattibilità. Essa è stata calata nel caso Covid-19, dato il periodo attuale, proponendo una piattaforma in grado di raccogliere i dati rilevanti per individuare i sintomi di tale malattia, consentendo quindi il monitoraggio di pazienti sani o che hanno già contratto il virus.
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Rinaldini, Fabrizio. "Comunicazione tra dispositivi IoT e Cloud tramite protocollo MQTT." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13199/.
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Panoramica sull'Internet delle Cose. Introduzione, studio e contestualizzazione del protocollo MQTT. Analisi di una comunicazione di tra dispositivi IoT e Cloud tramite protocollo MQTT. Ricerca su soluzioni IoT preconfigurate. Confronto tra MQTT e HTTP, con metodo Post.
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Weimer, Michael [Verfasser], and P. [Akademischer Betreuer] Braesicke. "Towards Seamless Simulations of Polar Stratospheric Clouds and Ozone in the Polar Stratosphere with ICON-ART / Michael Weimer ; Betreuer: P. Braesicke." Karlsruhe : KIT-Bibliothek, 2019. http://d-nb.info/1201414849/34.
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Megahed, Khaled. "The impact of mineral dust aerosol particles on cloud formation." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=984083375.
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Pirahandeh, Mehdi. "A systematic literature review on cloud of things vulnerability." Thesis, Högskolan i Borås, Akademin för bibliotek, information, pedagogik och IT, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-15041.
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Every day, a new publication on information systems highlights about Cloud of Things (CoT) vulnerabilities; in most of these publications, vulnerability is quoted as the most substantial barrier for CoT realization. However, formulating a justifiable appraisement of the actual vulnerability impact on CoT is difficult because in many of these publications, the term security “vulnerability” is stated incorrectly as a threat or the publication does not discuss CoT-specific vulnerabilities. To achieve a well-founded understanding of CoT vulnerabilities, this literature review identifies the major vulnerabilities and their security controls and to identify any gaps for future research. A systematic literature review (SLR) approach using 58 articles is considered for this review. Based on this review, a taxonomy is created to classify the existing CoT vulnerabilities and security controls. This literature review identifies and discusses similarities and differences among various vulnerability issues and solutions. Most reviews previously performed were limited to the threats to the application interface and virtualization level, whereas this SLR thesis expand to the vulnerabilities in connectivity and things level of CoT. This study emphasize the importance of a clear definition of cloud of things vulnerabilities and to facilitate better understanding and assessment of CoT vulnerabilities to build more secure systems.
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Vargas, Vargas Fernando. "Cloudlet for the Internet-of- Things." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-191433.
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With an increasing number of people currently living in urban areas, many cities around the globe are faced with issues such as increased pollution and traffic congestion. In an effort to tackle such challenges, governments and city councils are formulating new and innovative strategies. The integration of ICT with these strategies creates the concept of smart cities. The Internet of Things (IoT) is a key driver for smart city initiatives, making it necessary to have an IT infrastructure that can take advantage of the many benefits that IoT can provide. The Cloudlet is a new infrastructure model that offers cloud-computing capabilities at the edge of the mobile network. This environment is characterized by low latency and high bandwidth, constituting a novel ecosystem where network operators can open their network edge to third parties, allowing them to flexibly and rapidly deploy innovative applications and services towards mobile subscribers. In this thesis, we present a cloudlet architecture that leverages edge computing to provide a platform for IoT devices on top of which many smart city applications can be deployed. We first provide an overview of existing challenges and requirements in IoT systems development. Next, we analyse existing cloudlet solutions. Finally, we present our cloudlet architecture for IoT, including design and a prototype solution. For our cloudlet prototype, we focused on a micro-scale emission model to calculate the CO2 emissions per individual trip of a vehicle, and implemented the functionality that allows us to read CO2 data from CO2 sensors. The location data is obtained from an Android smartphone and is processed in the cloudlet. Finally, we conclude with a performance evaluation.Med en befolkning som ökar i urbana områden, står många av världens städer inför utmaningar som ökande avgaser och trafikstockning. I ett försök att tackla sådana utmaningar, formulerar regeringar och stadsfullmäktige nya och innovativa strategier. Integrationen av ICT med dessa strategier bildar konceptet smart cities. Internet of Things (IoT) är en drivande faktor för smart city initiativ, vilket gör det nödvändigt för en IT infrastruktur som kan ta till vara på de många fördelar som IoT bidrar med. Cloudlet är en ny infrastrukturell modell som erbjuder datormolnskompetens i mobilnätverkets edge. Denna miljö karakteriseras av låg latens och hög bandbredd, utgörande ett nytt ekosystem där nätverksoperatörer kan hålla deras nätverks-edge öppet för utomstående, vilket tillåter att flexibelt och snabbt utveckla innovativa applikationer och tjänster för mobila subskribenter. I denna avhandling presenterar vi en cloudlet-arkitektur som framhäver edge computing, för att förse en plattform för IoT utrustning där många smart city applikationer kan utvecklas. Vi förser er först med en överblick av existerande utmaningar och krav i IoT systemutveckling. Sedan analyserar vi existerande cloudlet lösningar. Slutligen presenteras vår cloudlet arkitektur för IoT, inklusive design och en prototyplösning. För vår cloudlet-prototyp har vi fokuserat på en modell av mikroskala för att räkna ut CO2 emissioner per enskild resa med fordon, och implementerat en funktion som tillåter oss att läsa CO2 data från CO2 sensorer. Platsdata är inhämtad med hjälp av en Android smartphone och behandlas i cloudlet. Det hela sammanfattas med en prestandaevaluering.
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Bertin, Matteo. "Cross-platform and Cloud-oriented Mobile Software Development with React Native and AWS." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18655/.
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Nell'ultima decade il mercato mobile ha visto una rapida e costante crescita nei volumi di dispositivi mobili distribuiti nel mondo, nonché al numero di utenze, e questo trend non accenna a diminuire. In un mercato dominato dai sistemi operativi mobile Android e iOS, lo sviluppo ed il supporto di applicativi mobile per entrambe le piattaforme consente una copertura degli utenti superiore al 97%. Tuttavia, l'accesso alle risorse necessarie per lo sviluppo di applicativi mobile cross-piattaforma e con funzionalità di cloud computing risulta complessa, se non proibitiva per costi e tempistiche progettuali. Tradizionalmente, ciascuna piattaforma mobile richiederebbe l'utilizzo di linguaggi di programmazione specifici per lo sviluppo di applicativi. La scelta del framework di sviluppo React Native ha consentito una rapida prototipizzazione di un applicativo mobile per le piattaforme Android ed iOS. La sua adozione ha consentito inoltre l'ingente riutilizzo di codice tra le piattaforme. Non è stata necessaria la conoscenza pregressa di programmazione nativa Android o iOS, favorendo inoltre eventuali contributi futuri alla baseline del progetto da parte di sviluppatori web senza requisiti di programmazione mobile. La configurazione e l'accesso alle API dei servizi di back-end da parte del client React Native è stata eseguita con successo per mezzo del framework AWS Amplify.
Il back-end è costituito da uno stack di webservices AWS, comprendente AWS Amazon API Gateway, AWS Lambda, AWS Amazon DynamoDB, AWS Amazon Cognito e AWS Amazon S3.
La realizzazione di un applicativo Android nativo, avente funzionalità equivalenti a quello realizzato con React Native e connesso al medesimo back-end AWS, consentirà l'esecuzione dei test comparativi tra i due differenti framework di sviluppo mobile. Tutti i test verranno condotti su di un device fisico avente sistema operativo Android. Verrà quindi riportata la descrizione dei test e dei risultati ottenuti, assieme alla loro valutazione.
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Jiang, Hanqiu. "Structure, dynamic, and thermodynamic relationships of worm-like micelles." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1553618133295199.
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Ibn, Khedher Hatem. "Optimization and virtualization techniques adapted to networking." Thesis, Evry, Institut national des télécommunications, 2018. http://www.theses.fr/2018TELE0007/document.
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Dans cette thèse, on présente nos travaux sur la virtualisation dans le contexte de la réplication des serveurs de contenu vidéo. Les travaux couvrent la conception d’une architecture de virtualisation pour laquelle on présente aussi plusieurs algorithmes qui peuvent réduire les couts globaux à long terme et améliorer la performance du système. Le travail est divisé en plusieurs parties : les solutions optimales, les solutions heuristiques pour des raisons de passage à l’échelle, l’orchestration des services, l’optimisation multi-objective, la planification de services dans des réseaux actifs et complexes et l'intégration d'algorithmes dans une plate-forme réelleIn this thesis, we designed and implemented a tool which performs optimizations that reduce the number of migrations necessary for a delivery task. We present our work on virtualization in the context of replication of video content servers. The work covers the design of a virtualization architecture for which there are also several algorithms that can reduce overall costs and improve system performance. The thesis is divided into several parts: optimal solutions, greedy (heuristic) solutions for reasons of scalability, orchestration of services, multi-objective optimization, service planning in complex active networks, and integration of algorithms in real platform. This thesis is supported by models, implementations and simulations which provide results that showcase our work, quantify the importance of evaluating optimization techniques and analyze the trade-off between reducing operator cost and enhancing end user satisfaction index
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Dearden, Christopher. "Exploring the effects of microphysical complexity in numerical simulations of liquid and mixed-phase clouds." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/exploring-the-effects-of-microphysical-complexity-in-numerical-simulations-of-liquid-and-mixedphase-clouds(abe4b249-a608-4a42-819c-962e2114d1ba).html.
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This thesis forms a NERC funded CASE studentship with the Met Office, whose aim is to investigate the treatment of cloud microphysical processes in numerical models, with a particular focus on exploring the impacts and possible benefits of microphysical complexity for the purpose of simulating clouds and precipitation. The issue of complexity is an important one in numerical modelling in order to maintain computational efficiency, particularly in the case of operational models. The latest numerical modelling tools are utilised to perform simulations of cloud types including idealised trade wind cumulus, orographic wave cloud and wintertime shallow convective cloud. Where appropriate, the modelling results are also validated against observations from recent field campaigns. The Factorial Method is employed as the main analysis tool to quantify the effect of microphysical variables in terms of their impact on a chosen metric. Ultimately it is expected that the techniques and results from this thesis will be used to help inform the future development of cloud microphysics schemes for use in both cloud resolving and operational models. This is timely given the current plans to upgrade the microphysics options available for use within the Met Office Unified Model. For an idealised warm cloud, it is shown that different bin microphysics schemes can produce different results, and therefore additional microphysical complexity does not necessarily ensure a more consistent simulation. An intercomparison of bin microphysics schemes in a 1-D column framework is recommended to isolate the origin of the discrepancies. In relation to the mixed-phase wave cloud, model simulations based on an adaptive treatment of ice density and habit struggled to reproduce the observed ice crystal growth rates, highlighting the need for further laboratory work to improve the parameterization of ice growth by diffusion within the sampled temperature regime. The simulations were also found to be largely insensitive to values of the deposition coefficient within the range of 0.1 to 1.0. Results from a mesoscale modelling study of shallow wintertime convection demonstrate the importance of the representation of dynamical factors that control cloud macrostructure, and how this has the potential to overshadow any concerns of microphysical complexity. Collectively, the results of this thesis place emphasis on the need to encourage more synergy between the dynamics and microphysics research communities in order to improve the future performance of numerical models, and to help optimise the balance between model complexity and computational efficiency.
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Nergis, Damirag Melodi. "Web Based Cloud Interaction and Visualization of Air Pollution Data." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254401.
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According to World Health Organization, around 7 million people die every year due to diseases caused by air pollution. With the improvements in Internet of Things in the recent years, environmental sensing systems has started to gain importance. By using technologies like Cloud Computing, RFID, Wireless Sensor Networks, and open Application Programming Interfaces, it has become easier to collect data for visualization on different platforms. However, collected data need to be represented in an efficient way for better understanding and analysis, which requires design of data visualization tools. The GreenIoT initiative aims to provide open data with its infrastructure for sustainable city development in Uppsala. An environmental web application is presented within this thesis project, which visualizes the gathered environmental data to help municipality organizations to implement new policies for sustainable urban planning, and citizens to gain more knowledge to take sustainable decisions in their daily life. The application has been developed making use of the 4Dialog API, which is developed to provide data from a dedicated cloud storage for visualization purposes. According to the evaluation presented in this thesis, further development is needed to improve the performance to provide faster and more reliable service as well as the accessibility to promote openness and social inclusion.Enligt World Health Organization dör 7 miljoner människor varje år på grund av sjukdomar orsakade av luftföroreningar. Med förbättringar inom Internet of Things under senare år, har betydelsen av system för miljösensorer. Genom att använda tekniker som molntjänster, RFID, trådlösa sensornätverk och öppna programmeringsgränssnitt, har det blivit enklare att samla in data för visualisering på olika plattformar. Men insamlad data behöver bli representerad på ett effektivt sätt för bättre förståelse och analys, vilket kräver utformande av verktyg för visualisering av data. Initiativet GreenIoT strävar mot att erbjuda öppen data med sin infrastruktur för hållbar stadsutveckling i Uppsala. I detta arbete presenteras en webb-tillämpning, som visualiserar den insamlade miljödatan för att hjälpa kommunen att implementera nya policies för hållbar stadsutveckling, och stimulera medborgare till att skaffa mer kunskap för att göra miljövänliga val i sin vardag. Tillämpningen har utvecklats med hjälp av 4Dialog API, som tillhandahåller data från lagring i molnet för visualiseringssyfte. Enligt den utvärdering som presenteras i denna rapport konstateras att vidare utveckling behövs för att förbättra dels prestanda för att erbjuda en snabbare och mer tillförlitlig service, och dels åtkomstmöjligheter för att främja öppenhet och social inkludering.
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Bäuml, Georg. "Influence of the sub-grid scale variability of clouds on the solar radiative transfer computations in the ECHAM5 climate model." Hamburg : Max-Planck-Inst. für Meteorologie, 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=967804655.
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Tost, Holger. "Global modelling of cloud, convection and precipitation influences on trace gases and aerosols." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=982575963.
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