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Showing result 21 - 25 of 62 essays matching the above criteria.

  1. 21. Original: X-ray Spectral Analysis of a Serendipitously Observed Active Galactic Nucleus

    University essay from KTH/Skolan för teknikvetenskap (SCI)

    Author : Teodor Elmfeldt; Filip af Malmborg; [2020]
    Keywords : ;

    Abstract : An active galactic nucleus (AGN) is a region in the center of a galaxy with a supermassive black hole continuosly accreting material. This accretion gives rise to large amounts of radiation across the whole electromagnetic spectrum, and largely affects the regions around the AGN and the evolution of the whole galaxy. READ MORE

  3. 22. Analysis of Customer Behaviours on Customer Reviews and Ratings

    University essay from KTH/Skolan för industriell teknik och management (ITM)

    Author : Alkim Yetis; Erkut Kavak; [2020]
    Keywords : Customer reviews; e-commerce; customer behaviour; fashion industry; genderbased products; text-typed comments; content analysis; Kundrecensioner; e-handeln; kundbeteende; modebranschen; könsinriktade produkter; textskrivna kommentarer; innehållsanal;

    Abstract : With the rapid accretion of online shopping, online customer reviews have become a very essential source. An interpretation of this essential source is not fulfilled with every aspect since online customer reviews consists of unstructured information. READ MORE

  4. 23. Ultraluminous sources in X-ray sky surveys

    University essay from Uppsala universitet/Högenergifysik

    Author : Miquel Colom i Bernadich; [2020]
    Keywords : X-rays; X-ray astronomy; black holes; neutron stars; accretion physics; XMM-Newton; eROSITA;

    Abstract : Ultraluminous X-ray sources (ULXs) are extragalactic, non-nuclear, point-like X-ray sources whose luminosity supersedes that of the Eddington limit of an accreting stellar mass black hole (L> 10 ^ 39 erg / s). Most of them are powered by black holes and neutron stars undergoing genuine super-Eddington accretion, with a small handful of candidates being consistent with sub-Eddington accretion on an intermediate mass black hole. READ MORE

  5. 24. How did Jupiter form?

    University essay from Lunds universitet/Astronomi - Genomgår omorganisation

    Author : Calle Ahlgren; [2019]
    Keywords : Planet formation; Planet migration; Physics and Astronomy;

    Abstract : Two relatively new concepts in planetary science are planetary migration; wherein the planets migrate through the protoplanetary disk as they form, and pebble accretion; wherein the planetesimals which become terrestrial planets and giant planet cores grow through the accretion of small pebbles. Planetary migration has become a generally accepted concept but there is still much to be learned even about how it affected the formation of our own solar system. READ MORE

  6. 25. Tuned sustainable anodic coatings for reduced ice adhesion

    University essay from Linköpings universitet/Molekylär ytfysik och nanovetenskap

    Author : Thirza Poot; [2019]
    Keywords : aluminum alloys; tartaric-sulfuric acid anodizing; ice adhesion; silanization; hydrothermal sealing; contact angle; SEM; corrosion;

    Abstract : Aluminum alloys are widely used materials in the aircraft industry due to their high specific strength and durability. The natural corrosion resistance of aluminum can be improved through an electrochemical anodizing process. READ MORE