Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 187 for “"AMS"”.
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Cosmic ray lithium isotope measurement with AMS-01
The AMS-01 detector measured charged cosmic rays during 10 days on the Space Shuttle Discovery in 1998 and collected 108 events. By identifying 8349 Lithium and 22709 Carbon nuclei from the raw data, this thesis presents the measurement of cosmic ray Lithium to Carbon ratio of presently highest …
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A transition radiation detector and gas supply system for AMS
Alpha Magnetic Spectrometer is an experiment that will be on the International Space Station for three years. It will look for anti-matter and dark matter. Supersymmetric dark matter could produce an excess in the 10-300GeV positron spectrum. A 10-6 separation of positrons from the more abundant …
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Search for antideuterons and strangelets in cosmic rays with AMS-01
AMS (the Alpha Magnetic Spectrometer) is a high-energy particle detector in space. An engineer- ing version of AMS, AMS-01, flew on the space shuttle Discovery for ten days in June 1998 and collected 108 cosmic ray events. This thesis extends the previous results of the AMS-01 flight by performing …
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Measurement of helium isotopic composition in cosmic rays with AMS-02
… matter. In six years of data taking, AMS has collected the largest available data set on fluxes of cosmic-ray helium. Events are selected to form a clean sample of galactic helium nuclei, for which velocity and rigidity give a measurement of particle mass that allows the measurement of …
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Search for microquasar features in cosmic ray spectra with AMS-01
… cosmic-ray acceleration in supernova shocks. The AMS-01 instrument measured cosmic ray protons and helium during 10 days on the Space Shuttle Discovery in 1998; we analyze this data searching for spectral distortions due to nearby microquasar activity. We show that the microquasar contribution to …
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On-Orbit Pointing Risk Mitigation for the Agile MicroSat (AMS) CubeSat Laser Guidestar Payload
The AMS Beacon is a ½-U laser guidestar payload, scheduled to launch in April 2022 aboard the Agile MicroSat (AMS) 6-U CubeSat. The payload carries a laser with a wavelength of 976 nm and a power of up to 500 mW. The AMS Beacon will be the first to provide an active lasing low Earth orbit reference …
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Precision measurement of the boron to carbon ratio in cosmic rays with AMS-02
… using the first 30 months of flight data of AMS-02 located on the International Space Station. Above 20 GeV/n, it is the first accurate measurement. About 5 million clean Boron and Carbon nuclei are identified. The experimental and analysis challenges in achieving a high precision measurement …
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AMS-14C-Analysen zur Rekonstruktion der Landschafts- und Kulturgeschichte in der Region Palpa (S-Peru)
… zur Herstellung von Graphit-Targets für AMS-Messungen (AMS = Beschleuniger-Massen-Spektrometer) aufgebaut. Die Anlage arbeitet semi-automatisch und wird mit dem eigens dafür entwickelten Steuerprogramm HAMSTER überwacht. Mit der AMS-Technik können 14C-Proben im Milli- oder …
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Precision measurement of electron and positron flux in cosmic rays with the AMS-02 Detector
… data taking( over 41 billion events), with the AMS-02 detector on the International Space Station(ISS) 330-410 km above earth. A precise calibration of the Electromagnetic Calorimeter(ECAL) signals is performed to obtain stable energy measurement. A reconstruction algorithm for electromagnetic …
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A search for Z = -1 dark matter annihilation products in cosmic rays with AMS-01
… During a ten day space shuttle flight, the AMS-01 detector recorded over 100 million cosmic ray events. This analysis searches for the products of neutralino annihilation in the AMS-01 Z=-1 spectrum, and uses the results to place limits on which supersymmetric and dark matter halo …
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A search for signatures of dark matter in the AMS-01 electron and antiproton spectrum
… annihilation in the charge Z = -1 spectrum of AMS-01 (essentially electrons and antiprotons). To avoid model dependent complications we assume that the primary annihilation channel is through W+W- production. We use the galactic propagation software GALPROP to determine the dark matter spectra …
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Antibacterial and Laundering Properties of Ams and Phmb as Finishing Agents for Healthcare Workers Uniforms
… ammonium chloride) or AEGIS Microbeshield, (AMS) and polyhexamethylene biguanide (PHMB) or Reputexâ · before laundering and after 5, 10, and 25 laundering cycles. The independent variables were the treatments (i.e., AMS, PHMB, no treatment) and the laundering cycles (i.e., 0, 5, 10, 25). The …
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Critical gradient for internal erosion in earthen d ams : a comparative analysis of two predictive methodologies
… level) is important during the risk analysis of dams. Uncertainty leads to inexact relative risk in portfolio management; therefore it is essential to get as accurate a risk estimation as possible for each project in a portfolio. To understand the uncertainty inherent in the predictive …
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Prévision de la production nationale d’arachide au Sénégal à partir du modèle agrométéorologique AMS et du NDVI
As many subsaharian countries, the agriculture of Senegal is widely dependent on the climate. This agriculture takes up 60% of active population and contributes at 20% of the GDP. It’s dominated by many crops industries, whose groundnut industry. The aim of this study is to find a forecasting model …
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Measurement of the Fluorine, Sodium, and Aluminum Fluxes in Cosmic Rays with the AMS Experiment on the International Space Station
… collected by the Alpha Magnetic Spectrometer (AMS) during the first 8.5 years of operation. The F flux is believed to be the only pure secondary flux between oxygen and silicon, and Na and Al fluxes are thought to be produced both in astrophysical sources and by the collisions of heavier nuclei …
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Effects of anisotropic magnetic susceptibility in data interpretation and its potential in application
Anisotropic magnetic susceptibility (AMS) contains information about the internal structure of magnetic geologic units and may have the potential to provide information about the formation history and subsequent geologic processes to which these units were subjected. Its application in the …
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