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 71 for “"SKA"”.
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A study of the SA SKA RFI measurement systems
This dessertation documents the findings of a study of the functionality of RFI Measurement System 2 that was conducted by the author. An in depth study of MEMO 37 (RFI Measurement Protocol) was employed first. After which, an exhaustive audit of all the equipment used and a thorough analysis of …
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Thermal design and analysis of the SKA SA MeerKAT Digitiser
… other African countries), will be host to the SKA site. Both countries are building pre-cursor radio telescopes to demonstrate their ability to successfully host the project. Square Kilometre Array South Africa (SKA SA) is currently constructing the MeerKAT Radio Telescope in the Karoo Desert. …
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Design and Implementation of an RFI Direction Finding System for SKA Applications
For radio astronomy telescopes to be able to perform observations of weak signals from space, they need to operate in a radio-quiet environment. Any radio frequency interference (RFI) will interfere with the ability of the telescope to collect data. With the proliferation of electrical and …
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A scalable database model of RFI data for the MeerKAT/SKA radio telescope
… making it suitable for the MeerKAT and SKA radio telescopes.
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Cosmological constraints using 2- and 3-point correlations with meerkat, the ska and other surveys
… mapping experiments. Upcoming surveys by SKAO and HIRAX will undertake intensive line-intensity observations, complementing galaxy surveys. This study provides new forecasts on cosmological constraints derived from the combined analysis of the 21cm power spectrum and bispectrum. We use …
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The faint low-frequency radio universe in continuum: exploitation of the pre-SKA deepest survey
… to pave the way for upcoming radio surveys with SKA pathfinders and precursors.
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L-band RFI measurement system simulation and investigation
The Square Kilometre Array (SKA) is a multi billion dollar international project to create a receiving surface of a million square metres, one hundred times larger than the biggest receiving surface now in existence. The SKA core array will have to be located in a remote area. Therefore countries …
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Effects of a Pharmacological Activator of Ca2+-activated K+ Channels (KCa2/3) on Recovery from Acute Myocardial Infarction in Mice
… KCa 2.3 and KCa 3.1 channel activity (i.e. SKA-31). Recent studies from our group have demonstrated that acute SKA-31 treatment improved agonist-evoked vasodilation in resistance arteries from multiple vascular beds and species, and this effect remains robust in arteries from Type 2 Diabetic …
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The effects of land use change, from small livestock farming to protected area, on vegetation and mammal communities in the SKA region of the Karoo, South Africa
Land-use change, particularly agriculture, has been identified as one of the major drivers of biodiversity loss worldwide. Meeting global biodiversity targets requires both the establishment of protected areas (PAs) and learning to coexist with wildlife in human-modified landscapes, particularly …
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A Completely Integrated Warm-IF Receiver and a 10GS/s Analog-Delay Pipeline ADC for Radio-Telescope Applications
… to be used. The Square Kilometer Array (SKA) is another major global effort to create the most sensitive radio telescope ever attempted. This radio telescope involves more than a hundred universities as well as industry. The SKA will potentially require millions of antenna elements, each …
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Measuring Galaxy Asymmetry in Different Dimensions
… galaxy color and structure. The upcoming SKA radio-telescopes will record unprecedented numbers of HI cubes. An SKA pathfinder, the upcoming WALLABY survey will record thousands of HI galaxy cubes. Galaxy Asymmetry can be used as a fast non-parametric measure to infer the physical …
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”Tvekar man, förkastar man” : en kvalitativ studie om kommentarsmoderering på Svenska Yles webbplats
… kvalitativ studie om hur moderatorerna vid Svenska Yle bedömer att antingen avslå eller godkänna kommentarer på webbsidan svenska.yle.fi. och vad som är avgörande för att en kommentar ska förkastas. Forskningen ger perspektiv på hur kommentarer ska modereras ur moderatorernas synvinkel och om …
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Multimedievarumärket : Särskilt om dess särskiljningsförmåga
… (EG) NR 207/2009 av den 26 februari 2009 om gemenskapsvarumärken (gemenskapsvarumärkesförordningen). I och med detta avskaffandes bland annat kravet på grafisk återgivning som en förutsättning för att ett varumärke ska kunna registreras som ett EU-varumärke. Tack vare detta blev det möjligt att …
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The Design of an Anti-Aliasing Filter for the Next Generation Digitiser
… the international Square Kilometre Array (SKA) project. The MeerKAT array has been designed to observe radio signals produced by celestial sources at UHF-Band, L-Band, S-Band and X-Band frequencies. The first phase of the construction included the design, development and integration of the …
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Core-collapse supernovae in the great survey era
… radio telescope, the Square Kilometer Array (SKA). SKA will be capable of unbiased synoptic searches over large fields of view with remarkable sensitivity and explode the radio core-collapse supernova inventory from the current number of several dozen in the local universe to ~ 600 yr^−1 …
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Assessing GridSim for modeling the global distribution of next-generation astronomy data
… and managed. The Square Kilometer Array (SKA) radio telescope will share large volumes of science-ready astronomical data with the project collaborating partners. This dissertation attempts to address the weaknesses of the GridSim simulation toolkit for the configuration of the SKA data …
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Characterisation of a dual frequency conversion superheterodyne receiver
… starts off with a brief introduction of the SKA project, and explain how it relates to the KAT project. Then certain receiver design techniques and parameters will be discussed together with receiver design trade-offs will be presented. This dissertation will then focus on the actual …
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”Bojkotta paraden i Jakobstad” : en jämförande studie av insändare om Jeppis Pride och Nykarleby Pride i Österbottens Tidning
Syftet med denna avhandling är att granska insändare om prideparaderna i två österbottniska småstäder – Jakobstad och Nykarleby. Paraderna ägde rum 2014 respektive 2017. De texter som granskas i avhandlingen har publicerats i lokaltidningen Österbottens Tidning under en tid före och efter …
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Genetic programming applied to RFI mitigation in radio astronomy
… by the South African Square Kilometre Array (SKA-SA). Karoo GP, kNN, and SVM were comparatively employed, the outcome of which provided noteworthy correlations between input parameters, the complexity of the evolved hypotheses, and performance of raw data versus engineered features. This …
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A new systemic model for the implementation of sustainable space science and technology investment for Sub-Saharan African economies: an implementation process derived from a case study of MeerKAT and the Square Kilometre Array projects
… and the forthcoming Square Kilometre Array (SKA) as central case studies. Econometric analysis of Sub Saharan African (SSA) economies reveals that standard economic inputs namely labour, capital, and technology, are insufficient to plan for or predict growth in this context. Instead, a …
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