Sökning: "radiation"

Visar resultat 16 - 20 av 2048 avhandlingar innehållade ordet radiation.

1. 16. Impact of Ionizing Radiation on 4H-SiC Devices

   Författare :Muhammad Usman; Anders Hallén; Einar Örn Sveinbjörnsson; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Silicon carbide; ionizing radiation; bipolar junction transistors; reliability; surface passivation; high-k dielectrics; MIS; radiation hardness;

   Sammanfattning : Electronic components, based on current semiconductor technologies and operating in radiation rich environments, suffer degradation of their performance as a result of radiation exposure. Silicon carbide (SiC) provides an alternate solution as a radiation hard material, because of its wide bandgap and higher atomic displacement energies, for devices intended for radiation environment applications. LÄS MER

3. 17. Radiation Hardness of 4H-SiC Devices and Circuits

   Författare :Sethu Saveda Suvanam; Anders Hallén; Carl-Mikael Zetterling; Ulrike Grossner; KTH; []
   Nyckelord :Silicon carbide; radiation hardness; protons; gamma radiation; bipolar junction transistors; aluminium oxide; surface recombination.; Informations- och kommunikationsteknik; Information and Communication Technology;

   Sammanfattning : Advances in space and nuclear technologies are limited by the capabilities of the conventional silicon (Si) electronics. Hence, there is a need to explore materials beyond Si with enhanced properties to operate in extreme environments. In this regards, silicon carbide (4H-SiC), a wide bandgap semiconductor, provides suitable solutions. LÄS MER

4. 18. Arctic clouds - interactions with radiation and thermodynamic structure

   Författare :Joseph Sedlar; Michael Tjernström; Annica Ekman; Johannes Verlinde; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Arctic; stratus; radiation; thermodynamic structure; cloud radiative forcing; seasonal transition; Meteorology; Meteorologi; atmosfärvetenskap; Atmospheric Sciences;

   Sammanfattning : Clouds play in important role in the climate system through their interaction with radiation. Globally, clouds tend to cool the Earth by reflecting solar radiation and shading the surface. LÄS MER

5. 19. Oxidized nucleotides as a predictor of radiation sensitivity

   Författare :Ali Pour Khavari; Siamak Haghdoost; Marie Öhman; Anders Nilsson; Bo Stenerlöw; Neus Visa; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; 8-oxo-dG; Radiation; Sensitivity; Oxidized; Nucleotides; ROS; NOS; molekylär biovetenskap; Molecular Bioscience;

   Sammanfattning : The direct and indirect effects of IR can lead to DNA damage and activation of DNA repair. The indirect effects of ionizing radiation mediated by reactive oxygen species (ROS) which produced through radiolysis of water and if not taken care of by the antioxidant system, can also give rise to oxidative stress. LÄS MER

7. 20. Radiation in simulations of high intensity laser-matter interaction

   Författare :Erik Karl Wallstén Wallin; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; plasma; nonlinear dynamics; particle-in-cell; Manley-Rowe; radiation reaction; synchrotron radiation;

   Sammanfattning : We consider electromagnetic waves propagating in plasmas, with two main themes covered. First nonlinear plasma theory and wave-wave interaction. Here a wave-wave symmetry, the Manley-Rowe relations, is used as a method of determining the physicality of modified plasma fluid equations. LÄS MER