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Thèses sur le sujet « Pulsar: generale »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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1

RIGOSELLI, MICHELA. "X-ray emission from the magnetic polar caps of old rotation-powered pulsars." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2020. http://hdl.handle.net/10281/277373.

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Le stelle di neutroni sono il risultato dell'evoluzione di stelle massive dopo l'esplosione di supernova. Il progetto di questa Tesi di PhD consiste nello studio dell'emissione di raggi X da parte di stelle di neutroni isolate di età superiore a 100000 anni. Sono stati analizzati dati provenienti dal satellite XMM-Newton (ESA). Per estrarre la miglior informazione possibile dai dati, ho implementato un metodo di maximum likelihood (ML) e l'ho utilizzato per estrarre spettri e profili pulsati di pulsar vecchie in banda X, che poi sono stati analizzati con raffinati di emissione. La Tesi è strut

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Venter, Christo. "Millisecond pulsars and pulsar wind nebulae as sources of gamma rays and cosmic rays / C. Venter." Thesis, North-West University, 2008. http://hdl.handle.net/10394/2067.

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Venter, Christo. "The effect of general relativistic frame dragging on millisecond pulsar visibility for the H.E.S.S. telescope / C. Venter." Thesis, North-West University, 2004. http://hdl.handle.net/10394/215.

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It has been noted by several authors that General Relativistic frame dragging in rotating neutron stars is a first order effect which has to be included in a self-consistent model of pulsar magnetospheric structure and associated radiation and transport processes. To this end, I undertook the present study with the aim of investigating the effect of General Relativity (GR) on millisecond pulsar (MSP) visibility. I developed a numerical code for simulating a pulsar magnetosphere, incorporating the GR-corrected expressions for the electric potential and field. I included curvature radiation (CR)

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4

Gralla, Samuel E., Alexandru Lupsasca, and Alexander Philippov. "PULSAR MAGNETOSPHERES: BEYOND THE FLAT SPACETIME DIPOLE." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/622675.

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Most studies of the pulsar magnetosphere have assumed a pure magnetic dipole in flat spacetime. However, recent work suggests that the effects of general relativity are in fact of vital importance and that realistic pulsar magnetic fields will have a significant nondipolar component. We introduce a general analytical method for studying the axisymmetric force-free magnetosphere of a slowly rotating star of arbitrary magnetic field, mass, radius, and moment of inertia, including all the effects of general relativity. We confirm that spacelike current is generically present in the polar caps (su

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5

Van, Straten Willem Herman Bernadus, and straten@astron nl. "High-Precision timing and polarimeter of PSR JO437-4715." Swinburne University of Technology. School of Biophysical Sciences and electrical Engineering, 2003. http://adt.lib.swin.edu.au./public/adt-VSWT20040311.123754.

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This thesis reports on the recent results of a continuing, high-precision pulsar timing project, currently focused on the nearby, binary millisecond pulsar, PSR J0437_4715. Pulse arrival time analysis has yielded a remarkable series of constraints on the physical parameters of this system and evidence for the distortion of space-time as predicted by the General Theory of Relativity. Owing to the proximity of the PSR J0437_4715 system, relative changes in the positions of the Earth and pulsar result in both annual and secular evolution of the line of sight to the pulsar. Although the changes ar

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Gralla, Samuel E., Alexandru Lupsasca, and Alexander Philippov. "Inclined Pulsar Magnetospheres in General Relativity: Polar Caps for the Dipole, Quadrudipole, and Beyond." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/626414.

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In the canonical model of a pulsar, rotational energy is transmitted through the surrounding plasma via two electrical circuits, each connecting to the star over a small region known as a "polar cap." For a dipole-magnetized star, the polar caps coincide with the magnetic poles (hence the name), but in general, they can occur at any place and take any shape. In light of their crucial importance to most models of pulsar emission (from radio to X-ray to wind), we develop a general technique for determining polar cap properties. We consider a perfectly conducting star surrounded by a force-free m

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CUOFANO, Carmine. "Magnetic fields generated by r-modes in accreting millisecond pulsars." Doctoral thesis, Università degli studi di Ferrara, 2010. http://hdl.handle.net/11392/2389313.

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In rotating neutron stars the existence of the Coriolis force allows the presence of the so-called Rossby oscillations (r-modes) which are known to be unstable to emission of gravitational waves. In the Thesis, for the first time, we introduce the magnetic damping rate in the evolution equations of r-modes. We show that r-modes can generate very strong toroidal fields in the core of accreting millisecond pulsars by inducing differential rotation. We shortly discuss the instabilities of the generated magnetic field and its long time-scale evolution in order to clarify how the generated mag

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Icdem, Burcin. "Viscous Time Scale In Accreting Powered Pulsars And Anomalous X-ray Pulsars." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613373/index.pdf.

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In this thesis we analyse X-ray data of accretion powered low mass and high mass X-ray binaries to understand the nature of their accretion mechanisms by searching for some clues of viscous time-scales of their accretion discs, if they have, in their low frequency power density spectra created from their long-term X-ray observations, or by doing pulse timing analysis with much shorter X-ray data to detect the effects of torque fluctuations caused by the accreting material on the pulsar. The low mass and high mass X-ray binaries we analysed have breaks in their power density spectra, which are

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9

Yuen, Rai. "Pulsar Magnetosphere Revisited: Emission Geometry and the Synthesis of the Vacuum-Dipole and the Rotating-Magnetosphere Models." Thesis, The University of Sydney, 2013. http://hdl.handle.net/2123/10011.

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We reconsider the vacuum-dipole model (VDM) and the corotating-magnetosphere model (CMM) for pulsar electrodynamics. Both the VDM and the CMM are fatally flawed as stand-alone models. The former model is used for deriving certain pulsar parameters, such as the surface magnetic field strength and characteristic age, but it lacks the plasma required to emit the observed radiation. The latter model introduces important concepts, such as the Goldreich-Julian charge density and corotation electric field, which form the basis for more detailed models, but it neglects the inductive electric field. Wh

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Bernard, Franck. "Anesthesie generale pour cesarienne : comparaison, par oxymetrie pulsee, de deux methodes de preoxygenation." Rennes 1, 1992. http://www.theses.fr/1992REN1M051.

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Maines, Geoffrey C. "Underwater Pressure Pulses Generated by Mechanically Alloyed Intermolecular Composites." Thèse, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/30708.

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Recently, the use of thermite-based pressure waves for applications in cellular transfection and drug delivery have shown significant improvements over previous technologies. In the present study, a new technique for producing thermite-generated pressure pulses using fully-dense nano-scale thermite mixtures was evaluated. This was accomplished by evaluation of a stoichiometric mixture of aluminium (Al) and copper(II)-oxide (CuO) prepared by mechanical alloying. Flame propagation speeds, constant-volume pressure characteristics and underwater pressure characteristics of both a micron-scale and

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Crosbie, Ross Andrew. "Quantitative non-destructive evaluation using laser generated ultrasonic pulses." Thesis, University of Hull, 1987. http://hydra.hull.ac.uk/resources/hull:5393.

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The work presented here utilises features of laser generated ultrasound for the detection of defects in solids. Ultrasound is generated noncontactively by this method and likewise many of the detection devices used do not require direct coupling to the test pieces, thus acoustic pulses with high frequency components are able to be produced and monitored on a range of samples. Steel samples coated with between 3 and 7mm of plasma-transferred arc depositions are examined for bond quality via measurements of attenuation caused by porosity in the coatings, found to be related to weld current. Surf

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Hill, Samuel Joseph. "Time-frequency localisation of defects using broadband pulsed arrays." Thesis, University of Warwick, 2014. http://wrap.warwick.ac.uk/63771/.

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The spatial periodicity of an array of emitters with an alternating polarity structure is utilised to generate a wavefront with a range of interesting properties. This wavefront is generated by simultaneously exciting the elements with a pulse with carefully selected broadband characteristics. The creation of these waves leads to a broadband interference effect that causes the wavefront to cover a large range of solid angles. More interestingly, however, is the continuous variation of the frequency of the wavefront as a function of angle. Whilst this pulsed array system demonstrates many inter

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Fitzsimons, Paul. "Selective ablation of thin films using ultra-short laser pulses." Thesis, University of Liverpool, 2012. http://livrepository.liverpool.ac.uk/10853/.

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The micro processing of materials using ultra short pulse (USP) lasers with durations in the low picosecond (ps) and femtosecond (fs) range allows for the possibility of precision material removal on both nanometre and micron scales. Precision material removal can be achieved due to the near diffraction limited focus spot size and ultra-short pulse durations, which provide extremely high peak intensities with minimal thermal impact on the surrounding area. The work presented in this thesis is primarily concerned with the selective ablation of thin films deposited on various surfaces, using las

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Inam, Sitki Cagdas. "X-ray Observations Of Accretion Powered Pulsars." Phd thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605552/index.pdf.

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In this thesis, X-ray observations of four accretion powered pulsars are presented. Using RXTE observations of 4U 1907+09, we found three new pulse periods of the source. We found that the source spun-down almost at a constant rate of $dot nu$ = (-3.54 $pm 0.02) times 10^{-14}$ Hz s$^{-1}$ for more than 15 years. Using RXTE observations, X-ray flux related spectral and timing features in 2S 1417-62 were, in general, interpreted as a sign of a disc accretion with a similar geometry with a varying mass accretion rate, whereas spectral and timing features of the low X-ray flux regions were

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Patel, Sunil. "A chirped, pulsed laser system and magneto-optical trap for rubidium." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/66245/.

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This thesis covers the construction and characterisation of a magneto-optical trap (MOT) for 85Rb from the very beginning. It details both the optical and mechanical aspects from laser diode assembly, tuning and stabilisation to the preparation and assembly of the vacuum system. The MOT construction forms the first goal of the project, the second was to develop a laser system capable of producing custom programmable, amplitude modulated and frequency chirped pulses (on the tens of microseconds timescale) from a continuous wave source. This involved developing software and computer control for

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Sasmaz, Mus Sinem. "X-ray And Timing Properties Of Anomalous X-ray Pulsar 1e 2259+586." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/3/12608625/index.pdf.

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In this thesis, we present the spectral and timing variabilities of anomalous X-ray pulsar 1E 2259+586 observed with European Photon Imaging PN Camera (EPIC PN) on board X-ray Multi Mirror Mission (XMM), Proportional Counter Array (PCA) on board Rossi X-ray Timing Explorer (RXTE) and Advanced CCD Imaging Spectrometer (ACIS) on board Chandra X-ray Observatory. We presented the results of spectral analysis of 2000 January 11 ACIS observation. Pulse phase spectroscopy was performed on two XMM observations before and after the outburst. Pulse profiles of two XMM observations before the outburst

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Bannister, David A. "A pulsed NMR relaxation and diffusion study of water in treated and untreated waterlogged wood." Thesis, University of Nottingham, 1990. http://eprints.nottingham.ac.uk/11137/.

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Freezing curve, NMR relaxation data, and steady field gradient and pulsed field gradient experiments were conducted on samples of water-logged woods excavated from the Tudor warship, the Mary Rose and on similar samples impregnated with Polyethylene-Glycol solutions: the polymer used as a bulking agent to prevent decay. At least two distinguishable populations of water molecules are found in wood. Freezing curves indicate the presence of approximately 0.38 g/g of hydration water, close to that observed in fresh timbers. Relaxation measurements on pre-treated samples provides evidence of a very

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Cadot, Guillaume Bastien Jérémy. "Experimental and numerical investigations of diamond and related materials controlled-depth machining using pulsed laser ablation." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/46409/.

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Pulsed laser ablation is a non-conventional machining technique that is used to machine complex parts in ultra-hard materials and for minute part geometry, which are otherwise not readily accessible with conventional tooling. The constant development of new materials with enhanced properties, as well as the demand for products with improved functionality have led to a renewed interest for alternative machining. Pulsed laser ablation is regarded as a promising technology with potential to machine a wide range of materials and shapes. The use of non-mechanical methods is advantageous due to the

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20

Sourie, Aurélien. "Modèles superfluides d'étoiles à neutrons en relativité générale : applications à la dynamique des pulsars." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEO002/document.

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L'objectif de cette thèse est d'étudier différents aspects microscopiques et macroscopiques liés à la présence de superfluidité dans les étoiles à neutrons. Dans un premier temps, nous avons calculé des configurations stationnaires d'étoiles à neutrons superfluides en rotation, en relativité générale, basées sur l'utilisation d'équations d'état réalistes. A l'aide de ces configurations d'équilibre, nous avons ensuite développé un modèle simple de glitch, en relativité générale, vu comme un transfert de moment cinétique entre les neutrons superfluides et les particules chargées constituant l'ét

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21

Pacella, Manuela. "Pulsed laser ablation (PLA) of ultra-hard structures : generation of damage-tolerant freeform surfaces for advanced machining applications." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/27730/.

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The current methods for manufacturing super-abrasive elements result in a stochastic geometry of abrasives with random three-dimensional abrasive spatial locations. This thesis covers the laser generation of novel micro-cutting arrays in ultra-hard super-abrasive composites (e.g. polycrystalline diamond, PCD and polycrystalline cubic boron nitride, PCBN). Pulsed laser ablation (PLA) has been used to manufacture repeatable patterns of micro cutting/abrasive edges onto micro structurally different PCD/PCBN composites. The analysis on the influence of microstructural factors of the composite mate

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Patera, Giuseppe. "Quantum properties of ultra-short pulses generated by SPOPOs : multi-mode squeezing and entanglement." Paris 6, 2008. https://tel.archives-ouvertes.fr/tel-00404162.

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Ce mémoire présente une étudie théorique des propriétés dynamiques et quantiques d’un oscillateur paramétrique optique dégénéré de type I que est pompé de manière synchrone par un laser verrouillé en phase (SPOPO). Récemment, des SPOPO ont été exploité pour générer des impulsions optique de très bref durée et leurs propriétés temporelles ont été étudiées théoriquement. Ayant un très grand nombre de degrés de liberté, le champ sortant d’un SPOPO doit être caractérisé au moyen d’une analyse quantique multimodale. Par conséquent, nous développons d’abord un modèle multi-mode de ce système en dédu

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Özel, Feryal, Dimitrios Psaltis, Zaven Arzoumanian, Sharon Morsink, and Michi Bauböck. "MEASURING NEUTRON STAR RADII VIA PULSE PROFILE MODELING WITH NICER." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/622456.

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The Neutron-star Interior Composition Explorer is an X-ray astrophysics payload that will be placed on the International Space Station. Its primary science goal is to measure with high accuracy the pulse profiles that arise from the non-uniform thermal surface emission of rotation-powered pulsars. Modeling general relativistic effects on the profiles will lead to measuring the radii of these neutron stars and to constraining their equation of state. Achieving this goal will depend, among other things, on accurate knowledge of the source, sky, and instrument backgrounds. We use here simple anal

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Sahiner, Seyda. "X-ray Spectral And Timing Studies Of The High Mass X-ray Binary Pulsar 4u 1907+09." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610941/index.pdf.

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In this thesis, X-ray spectral and pulse timing analysis of the high mass X-ray binary pulsar 4U 1907+09, based on the observations with Rossi X-ray Timing Explorer (RXTE) and International Gamma-Ray Astrophysics Laboratory (INTEGRAL), are presented. INTEGRAL (October 2005 - November 2007) and RXTE (June 2007 - December 2008) observations confirm that the luminosity of the source is highly variable such that, flaring and dipping activities are observed. The results of time-averaged energy spectra of RXTE and INTEGRAL observations are consistent with the previous studies. Orbital phase reso

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Smithbauer, David Paul. "Analysis and Application of Automated Methods for Detecting Pulsars in the Green Bank Telescope 350MHz Drift-Scan Survey." Thesis, West Virginia University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1523624.

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<p> A significant portion of the process of detecting pulsars from radio sky surveys remains a largely manual task. The visual inspection of data in order to detect and validate potential pulsar candidates is by far the most time consuming portion of the overall process. Coupled with the fact that well over a Petabyte of pulsar survey data has been archived, the task of identifying these valuable phenomena is tedious and time consuming.</p><p> Using data from a survey performed with the National Radio Astronomy Observatory’s (NRAO’s) Green Bank Telescope (GBT) in 2007, this thesi

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Natarajan, Madhan. "Characterisation of pulpal responses to bacterial challenge and novel antimicrobials for management of bacterial contamination of infected pulps." Thesis, Cardiff University, 2018. http://orca.cf.ac.uk/116535/.

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Dental pain from pulpal infection and inflammation are the common cause of dental emergencies. Therefore, evaluation of modalities to treat them would be beneficial. This work aims to characterise and validate the previously developed ex vivo pulp infection model and make it reliable and reproducible in terms of quantifying cell viability, area of bacterial colonisation and expression of inflammatory markers. The method developed and used in this work demonstrated that SAG infection reduced cell viability and IL-10 levels. SAG infection also Increased area of SAG colonisation of pulp,expressio

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Dexter, J., A. Deller, G. C. Bower, et al. "Locating the intense interstellar scattering towards the inner Galaxy." OXFORD UNIV PRESS, 2017. http://hdl.handle.net/10150/625730.

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We use VLBA+VLA observations to measure the sizes of the scatter-broadened images of six of the most heavily scattered known pulsars: three within the Galactic Centre (GC) and three elsewhere in the inner Galactic plane (Delta l < 20 degrees). By combining the measured sizes with temporal pulse broadening data from the literature and using the thin-screen approximation, we locate the scattering medium along the line of sight to these six pulsars. At least two scattering screens are needed to explain the observations of the GC sample. We show that the screen inferred by previous observations of

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Giraud, Quentin. "Corrections général-relativistes à l’émission radio et haute énergie des pulsars." Thesis, Strasbourg, 2020. http://www.theses.fr/2020STRAE024.

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Les étoiles à neutrons sont des astres extrêmement denses, plus denses qu’un noyau atomique, formés au cours d’une supernova. Un étoile à neutrons typique concentre ainsi une masse supérieure à celle du Soleil dans son diamètre d’une vingtaine de kilomètres. D’après la théorie de la relativité générale, qui décrit la gravité comme une déformation de l’espace-temps, le champ gravitationnel de ces étoiles devrait affecter de manière non négligeable les rayonnements électromagnétiques à proximité de celles-ci. Au cours de ma thèse, j’ai simulé les émissions radio et haute énergie provenant de l’a

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Yukita, M., A. Ptak, A. E. Hornschemeier, et al. "Identification of the Hard X-Ray Source Dominating the E > 25 keV Emission of the Nearby Galaxy M31." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/623858.

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We report the identification of a bright hard X-ray source dominating the M31 bulge above 25 keV from a simultaneous NuSTAR-Swift observation. We find that this source is the counterpart to Swift J0042.6+4112, which was previously detected in the Swift BAT All-sky Hard X-ray Survey. This Swift BAT source had been suggested to be the combined emission from a number of point sources; our new observations have identified a single X-ray source from 0.5 to 50 keV as the counterpart for the first time. In the 0.5-10 keV band, the source had been classified as an X-ray Binary candidate in various Cha

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Abdel-Rahman, Mohamed A. "Numerical Reconstruction and Applications of Acoustic and Electromagnetic Ultra-Wideband Localized Pulses Generated by Dynamic Aperture Antennas." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/26335.

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A study is undertaken of the numerical reconstruction of acoustic and electromagnetic (EM) localized waves (LWs). The latter are carrier-free ultra-wideband pulses characterized by large focusing depths and extended ranges of localization. Special emphasis is placed on finite energy LWs that can be generated by dynamic aperture antennas with independently addressable elements. The reconstruction techniques are based on Huygens and Rayleigh-Sommerfeld integral I and II representations, both in the time and frequency domains. In contradistinction to the Weyl representation,they lend themselves t

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Sophian, Ali. "Characterisation of surface and sub-surface discontinuities in metals using pulsed eddy current sensors." Thesis, University of Huddersfield, 2003. http://eprints.hud.ac.uk/id/eprint/6916/.

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Due primarily to today's rigorous safety standards the focus of non-destructive testing (NDT) has shifted from flaw detection to quantitative NIDT, where characterisation of flaws is the objective. This means information such as the type of flaw and its size is desired. The Pulsed Eddy Current (PEC) technique has been acknowledged as one of the potential contenders for providing this additional functionality, due to the potential richness of the information that it provides. The parameters mainly used to obtain information about the detected flaws are the signal's peak height and arrival time.

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Fani-Pakdel, Farzad. "Microsecond pulsed Grimm glow discharge time-of-flight mass spectrometry study of aerosols generated by nebulization and laser ablation." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0024978.

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Taskin, Ozgur Mustafa. "Analysis Of The Physical Properties Of Different Types Of Neutron Stars." Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606665/index.pdf.

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This thesis is composed of three published articles. Each chapter is devoted to an article. In the first part the origin of some of the single radio pulsars with relatively low magnetic fields (B &lt<br>1e12 G) and with characteristic ages (tau) less than 1e7 years is questioned. We proposed that such pulsars might occur as a result of the disruption of high-mass X-ray binary systems after a second supernova explosion. In these binaries, mass accretion on to the surface of X-ray pulsars may lead to the decrease in the magnetic field from its value at birth (B similar to 1e12 &ndash<br>1e13 G)

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Yuksel, Yuksel. "Thermoelectric Cooling Of A Pulsed Mode 1064 Nm Diode Pumped Nd:yag Laser." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612550/index.pdf.

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Since most of the energy input is converted to thermal energy in laser applications, the proper thermal management of laser systems is an important issue. Maintaining the laser diode and crystal temperature distributions in a narrow range during the operation is the most crucial requirement for the cooling of a laser system. In the present study, thermoelectric cooling (TEC) of a 1064 nm wavelength diode pumped laser source is investigated both experimentally and numerically. During the heat removal process, the thermal resistance through and between the materials, the proper integration of th

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Banaschik, Robert [Verfasser]. "Potential of Pulsed Corona Discharges Generated in Water for the Degradation of Recalcitrant Pharmaceutical Residues and for Water Disinfection / Robert Banaschik." Greifswald : Universitätsbibliothek Greifswald, 2017. http://d-nb.info/1147900051/34.

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Pentlehner, Dominik [Verfasser], and Alkwin [Akademischer Betreuer] Slenczka. "Perturbations of electronic transitions of organic molecules in helium droplets generated with a new pulsed droplet source / Dominik Pentlehner. Betreuer: Alkwin Slenczka." Regensburg : Universitätsbibliothek Regensburg, 2010. http://d-nb.info/1022872168/34.

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Sutherland, Julia Robin Miller. "Phase-Matching Optimization of Laser High-Order Harmonics Generated in a Gas Cell." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd880.pdf.

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Akhmadaliev, Chavkat. "Investigation of acoustic waves generated in an elastic solid by a pulsed ion beam and their application in a FIB based scanning ion acoustic microscope." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-28813.

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The rapid growth of the microelectronics industry in the last decades made it possible to produce structures in the sub-micrometer scale on silicon chips and to reach an integration scale under 100 nm. Decreasing the size and increasing the complexity of these structures make a control of quality and defects investigation more difficult. During a long time ultrasound devices are being used for nondestructive investigation of materials, like ultrasound microscopes, scanning photo-acoustic microscopes or scanning electron-acoustic microscopes, where acoustic waves are generated by acoustic trans

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Akhmadaliev, Chavkat. "Investigation of acoustic waves generated in an elastic solid by a pulsed ion beam and their application in a FIB based scanning ion acoustic microscope." Forschungszentrum Rossendorf, 2004. https://hzdr.qucosa.de/id/qucosa%3A21708.

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The rapid growth of the microelectronics industry in the last decades made it possible to produce structures in the sub-micrometer scale on silicon chips and to reach an integration scale under 100 nm. Decreasing the size and increasing the complexity of these structures make a control of quality and defects investigation more difficult. During a long time ultrasound devices are being used for nondestructive investigation of materials, like ultrasound microscopes, scanning photo-acoustic microscopes or scanning electron-acoustic microscopes, where acoustic waves are generated by acoustic trans

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Beklen, Elif. "X-ray And Optical Observations Of High Mass X-ray Binaries." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612636/index.pdf.

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In this thesis, X-ray and optical observations of accretion powered pulsars are presented. By using archival RXTE observations we work on the X-ray spectral and pulse timing analysis of 4U 1538-52, 4U 1907+09, SMC X-1 to have more detailed information about their orbital and spin parameters. For 4U 1538-52 and SMC X-1, we determined new orbital epochs. By using long term pulse history of 4U 1907+09, we were able to work spin-down trend of the system and also calculate the change in the spin-down rate. Using Fermi/GBM observations we can monitor bright accreting pulsar systems. We are produc

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Mckechnie, Alasdair John. "In vitro and in vivo effects of human dendritic cells generated using a novel combination of cytokines and pulsed with nonapeptides of human telomerase reverse transcriptase." Thesis, University of Nottingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.441009.

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Johari, Dalina. "Features of the Electric Fields Generated by Lightning with Special Attention to Positive Ground Flashes." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-331885.

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This thesis focuses on the main processes in positive ground flashes and the distant lightning environment for both positive and negative ground flashes. It presents the characteristics of the preliminary breakdown pulses (PBPs), the characteristics of the electric field pulses observed during leader propagation, and the characteristics of the electric fields produced by the first and the subsequent return strokes. It also features the observations of distant positive and negative ground flashes at distances up to 1000 km. The results were based on electric field measurements conducted remotel

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Pele, Winnie Kasoma. "Income and bean consumption patterns in Zambia." Thesis, Kansas State University, 2015. http://hdl.handle.net/2097/19751.

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Master of Agribusiness<br>Department of Agricultural Economics<br>Vincent Amanor-Boadu<br>The literature shows that increases in incomes lead to changes in the allocation of income or expenditure shares to different food products. The purpose of this thesis is to identify the effect of income on expenditure share allocations among different food groups. The study was particularly interested in beans and how changes in incomes affect the share of bean expenditures. We used data from the 2010 Zambia Living Conditions Monitoring Survey (LCMS). The LCMS covers the whole country and provides segm

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Jacquet, Maxime J. "Negative frequency at the horizon : scattering of light at a refractive index front." Thesis, University of St Andrews, 2017. http://hdl.handle.net/10023/11780.

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This thesis considers the problem of calculating and observing the mixing of modes of positive and negative frequency in inhomogeneous, dispersive media. Scattering of vacuum modes of the electromagnetic field at a moving interface in the refractive index of a dielectric medium is discussed. Kinematics arguments are used to demonstrate that this interface may, in a regime of linear dispersion, act as the analogue of the event horizon of a black hole to modes of the field. Furthermore, a study of the dispersion of the dielectric shows that five distinct configurations of modes of the inhomogene

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Lodewijks, Marten Barend. "Probing general relativity through simulations of the Shapiro time delay of light in binary pulsar systems." Thesis, 2008. http://hdl.handle.net/10210/554.

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The theory of General Relativity has been in existence for 90 years and has stood up to all tests it has been subjected to in that time. The PPN parameter is a measure of the accuracy of theories of gravity and assumes different values in different theories. By measuring the Shapiro time delay of light it is possible to constrain and thereby constrain gravitational theories. This Shapiro time delay can be measured in our solar system but it is only in the vicinity of extremely compact objects such as pulsars and black holes that it can be tested under the immense gravitational fields that can

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"Tunable multiwavelength picosecond pulses generated from a fabry-perot laser diode." 1998. http://library.cuhk.edu.hk/record=b5889738.

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by Sui-Pan Yam.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 1998.<br>Includes bibliographical references.<br>Abstract also in Chinese.<br>Acknowledgements --- p.V<br>Abstract --- p.VI<br>Chapter Chapter 1 --- Introduction --- p.1-1<br>Chapter 1.1) --- Tunable Multi-Wavelength Optical Sources --- p.1 -1<br>Chapter 1.2) --- All-Optical Switching --- p.1 -3<br>Chapter 1.2.1) --- Nonlinear Effect<br>Chapter 1.2.2) --- Special Design of the Laser Structure<br>Chapter 1.2.3) --- Self-Injection Seeding of Fabry-Perot Laser Diode<br>Chapter 1.3) --- About This Project --- p.1-6<br>Chap

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"Wavelength selection and switching in short pulses generated from semiconductor lasers." 2000. http://library.cuhk.edu.hk/record=b5890470.

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by Chow Kin Kee.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2000.<br>Includes bibliographical references.<br>Abstracts in English and Chinese.<br>Abstract --- p.ii<br>Acknowledgment --- p.v<br>Table of Contents --- p.vi<br>Chapter 1. --- Introduction --- p.1<br>Chapter 1.1 --- Ultra-short Pulse Generation in Semiconductor Lasers --- p.2<br>Chapter 1.2 --- Wavelength Selection and Switching in Short Pulses Generated from Semiconductor Laser --- p.4<br>Chapter 1.3 --- Structure of the Thesis --- p.6<br>Reference --- p.8<br>Chapter 2. --- Principles and Theories --- p.10<br>Ch

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Liou, Jhe-Wei, and 劉哲瑋. "Characteristic of defect generated on graphene through pulsed scanning probe lithography." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/2jt2r6.

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碩士<br>國立中央大學<br>物理學系<br>105<br>Graphene has attracted attention in recent years because of low dimensional and high electron mobility. However, the gap-less feature is the main obstacle to further electronic application. Defect generation is one way to manipulate the band gap of graphene. To create defect on graphene, Scanning probe lithography (SPL) is a well-developed nano-meter scale technique. In our previous work, we formed graphene oxidation through negative bias SPL. However, the mechanism of the oxidation processing with SPL is still unveiled. To understand this, we set up a pulsed SPL

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Qi, Zhangfen. "Generation and characterization of femtosecond vacuum ultraviolet pulses." Thesis, 1994. http://hdl.handle.net/1911/13882.

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High power femtosecond VUV/XUV pulses covering new spectral regions have been generated through nonlinear interaction of a femtosecond KrF laser with xenon and argon. Conversion efficiencies as high as 10$\sp{-3}$ have been observed. A six-wave mixing process and several four-wave mixing processes under intense light field have been experimentally studied. The temporal duration of the femtosecond VUV pulse has been experimentally measured for the first time based on the defocusing caused by a femtosecond laser produced plasma.

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Sousa, Rui da Silva Pinto de. "Storage System for Pulsed Energy generated by a Pavement Energy Harvesting Solution." Master's thesis, 2020. https://hdl.handle.net/10216/132884.

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With the constant technological developments, there are nowadays (2020) the possibility of developing a Pavement Energy Harvesting solution that can harvest kinetic energy from vehicles and convert it into electricity. Harvesting kinetic energy from vehicles might be increasing road safety by reducing the vehicle´s speed without any driver action. When vehicles move across the module, an electro-mechanical system converts its surface motion into pulsed electric energy. The electric energy produced requires a storage system so it can be used in multiple electric applications locally installed.

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