Sökning: "ultraviolet radiation"

Visar resultat 6 - 10 av 25 uppsatser innehållade orden ultraviolet radiation.

  1. 6. Simulation of THz Quantum Cascade Lasers

    Master-uppsats, Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Författare :Viktor Rindert; [2021]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : Quantum Cascade Lasers (QCLs) have since their invention in 1994 become a crucial source for mid-infrared and THz radiation. Mid-infrared QCLs have achieved room temperature operation while THz QCLs have not. As such, simulations are an important tool in order to achieve a THz QCL operational at room temperature. LÄS MER

  3. 7. Towards Underwater UV Communication- Simulation and Experimentation on Penetration of UV Radiation into Sea water.

    Master-uppsats, Blekinge Tekniska Högskola

    Författare :Subhash Chandra Ranga; [2021]
    Nyckelord :Optical Communication; Underwater communication Underwater communication Optical communication; Underwater communication Acoustic communication; Underwater communication Microwave communication; Visible Light Communication; Refractive Index.;

    Sammanfattning : People around the globe are immensely trying to connect using light as carrier due to its low power consumption and high data transfer rates. Sound and microwaves are examples of other carriers that can be used, although they aren't nearly as efficient as light. A method of communicating is using light beneath the surface of the water. LÄS MER

  4. 8. Photodegradation of macroplastics to microplastics : A laboratory study on common litter found in urban areas

    Master-uppsats, Luleå tekniska universitet/Institutionen för samhällsbyggnad och naturresurser

    Författare :Jonathan Svedin; [2020]
    Nyckelord :;

    Sammanfattning : During the last 60 years the plastic production has increased more than 190 times and plasticpollution both at sea and land is a growing issue. Every year millions of tons of plastic waste fromland reaches the oceans, but the land-based sources are diffuse. LÄS MER

  5. 9. A study of the stability of vitamin 25[OH]D2 and 25[OH]D3

    Kandidat-uppsats, Linnéuniversitetet/Institutionen för kemi och biomedicin (KOB)

    Författare :Anna Kellström; [2020]
    Nyckelord :Vitamin D; 25-hydroxyvitamin D; pre-analytical relevance; HPLC-MS MS; stable; freeze-thaw cycles; light sensitivity; quality assurance;

    Sammanfattning : During the industrialization of the 19th century the negative health effects of vitamin D was discovered as children in the cities developed osteomalacia or more commonly known as rickets caused by vitamin D deficiency. Vitamin D is produced in the skin from 7-dehydrocholesterol during sun-exposure and enhances intestinal phosphor and calcium absorption thus enhancing the bone remodeling process. LÄS MER

  7. 10. Optronic enclosure for a Naval application.

    Master-uppsats, KTH/Skolan för industriell teknik och management (ITM)

    Författare :Felicia Nordberg; [2019]
    Nyckelord :;

    Sammanfattning : This Master thesis is a collaboration with Saab Järfälla with the purpose to find a more protective cover for the electro-optical side of their fire control director CEROS 200 version CWI. The project started with a background research to find as much information about the director as possible and examining some competitors within the area. LÄS MER