Sökning: "spektrum"

Visar resultat 36 - 40 av 151 avhandlingar innehållade ordet spektrum.

  1. 36. Advances in Stellar Astrophysics from Laboratory Spectroscopy

    Författare :Stefan Ivarsson; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Astronomy; iridium; osmium; uranium; oscillator strengths; Spectroscopy; term analysis; line profiles; line structure; astrophysics; Sun; Chi Lupi; 17 Comae A; chemically peculiar; praseodymium; stars; space research; cosmic chemistry; Astronomi; rymdvetenskap; kosmisk kemi; Fysicumarkivet A:2004:Ivarsson;

    Sammanfattning : Investigation of astrophysical plasmas, such as stellar atmospheres, require both knowledge of atomic structure and data. We present laboratory instruments, techniques and tools for acquisition of the data required to derive important atomic parameters such as, wavelengths, oscillator strengths and line profiles. LÄS MER

  3. 37. The synthesis of dendritic hydrogels and inorganic nanoparticles and their application as antibacterial and imaging materials

    Författare :Yanmiao Fan; Michael Malkoch; Annelie Brauner; Mauri Kostiainen; KTH; []
    Nyckelord :antibacterial hydrogels; dendritic polymers; dendrimers; silicon nanoparticles; cellulose nanofibrils; drug-resistant bacteria; wound dressings; Fiber- och polymervetenskap; Fibre and Polymer Science;

    Sammanfattning : AbstractThe overuse and misuse of conventional antibiotics has caused increased prevalence of drug-resistant bacteria, the infections of which cause high mortality and economic losses per year. It is therefore crucial to develop new technologies and treatments for infections caused by drug-resistant bacteria. LÄS MER

  4. 38. A systems thinking approach to corruption and natural resources in the context of sustainability

    Författare :Johanna Gisladottir; Sigurbjörg Sigurgeirsdottir; Kristin Vala Ragnarsdottir; Ingrid Stjernquist; Birgit Kopainsky; Robert Klitgaard; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; naturgeografi; Physical Geography;

    Sammanfattning : With growing awareness of the current climate crisis, it has become better recognized that natural resource management has global as well as local implications.  Discourse on the importance of sustainability has followed. Natural resource sectors have been known as areas prone to corruption risks due to the usually high revenues involved. LÄS MER

  5. 39. The role of deep hydrocarbons in the global hydrocarbon budget

    Författare :Daniil Kudryavtsev; Vladimir Kutcherov; Kostya Trachenko; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hydrocarbons; non-methane volatile hydrocarbons; carbon dioxide; methane; ethane; propane; butane; global warming; diamond-anvil cells; Raman spectroscopy; high pressure; high temperature; phase transition; Energy Technology; Energiteknik;

    Sammanfattning : Nowadays, the issue of global warming and related environmental problems got widespread awareness among scientific society, politics, the industry as well as it has affected our everyday life. The reason for such a negative impact on the atmosphere is attributed mainly to human activities. LÄS MER

  7. 40. On Massive MIMO Base Stations with Low-End Hardware

    Författare :Christopher Mollén; Erik G. Larsson; Thomas Eriksson; Josef Nossek; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; massive MIMO; hardware; ADC; power amplifier; out-of-band radiation; peak-to-average ratio;

    Sammanfattning : Massive MIMO (Multiple-Input Multiple-Output) base stations have proven, both in theory and in practice, to possess many of the qualities that future wireless communication systems will require.  They can provide equally high data rates throughout their coverage area and can concurrently serve multiple low-end handsets without requiring wider spectrum, denser base station deployment or significantly more power than current base stations. LÄS MER