Sökning: "Frequency Selective Surface"

Hittade 5 uppsatser innehållade orden Frequency Selective Surface.

1. 1. Design of an Array of Patch-elements With a Band-pass Frequency Selective Surface Hybrid Radome : Analysis and characterisation of a frequency selective surface and a phased array antenna

   Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Författare :Curt-Herman Normark Frisk; [2022]
   Nyckelord :Frequency Selective Surface; Microstrip Patch Element; Circular Polarisation; Phased Array Antenna; Single Feed; Frekvensselektiv Yta; Mikrostrip Patchelement; Cirkulär Polarisering; Fasstyrd Gruppantenn; Single-matad;

   Sammanfattning : A circular polarised phased array antenna and a frequency selective hybrid radome are designed and evaluated. The antenna system is well suited as a part of a communication link between platforms with a 600 MHz bandwidth and a centre frequency of 5 GHz. LÄS MER

3. 2. Investigation into Urea Deposit Risk by varying parameters in the control system related to urea evaporation

   Master-uppsats, KTH/Kemiteknik

   Författare :Anna Sandström; [2022]
   Nyckelord :Urea Deposits; Urea Decomposition; Selective Catalytic Reduction; Urea Dosing; Ureautfällning; Ureanedbrytning; Selektiv katalytisk reduktion; Ureadosering;

   Sammanfattning : I och med nuvarande och kommande lagkrav för utsläpp från tunga lastbilar finns en efterfrågan på utvecklade strategier för utsläppsminskning. För att kontrollera utsläppen av kväveoxider (NOx) används katalytisk omvandling med AdBlue (vätskeblandning av urea och vatten). LÄS MER

4. 3. Additive manufacturing and radio frequency filters : A case study on 3D-printing processes, postprocessing and silver coating methods

   Master-uppsats, KTH/Industriell produktion

   Författare :Ana García-Verdugo Zuil; Amanda Herrero Martín; [2020]
   Nyckelord :Additive manufacturing; radio-frequency filters; post-processing; silver coating; surface roughness; Multi Jet Fusion MJF ; Selective Laser Melting SLM ; Tillsatsstillverkning; radiofrekvensfilter; efterbehandling; silverbeläggning; ytojämnhet; Multi Jet Fusion MJF ; Selective Laser Melting SLM ;

   Sammanfattning : Additive manufacturing (AM) is an attractive way to shorten development time, reduce product weight and allow the manufacturing of more complex products than by conventional manufacturing processes. The problem arises when the previous traditional manufacturing requirements need to be fulfilled by AM as well as the volume production capability. LÄS MER

5. 4. Rear side BSF/emitter patterning of SHJ-IBC solar cells using selective deposition and hydrogen plasma etching of a-Si:H

   Master-uppsats, KTH/Skolan för informations- och kommunikationsteknik (ICT)

   Författare :Mahmudul Hasan; [2016]
   Nyckelord :;

   Sammanfattning : Silicon heterojunction interdigitated back-contact (SHJ-IBC) solar cells have attracted considerable attention because of their potential to achieve very highly efficiency. However, the back contacting scheme leads to additional fabrication complexity mainly resulting from the formation of interdigitated n- (back surface field (BSF)) and p-type (emitter) hydrogenated amorphous silicon (aSi:H) strips. LÄS MER

7. 5. Lactobacilli in the gastrointestinal tract of dog and wolf : isolation, identification and characterization of L. reuteri

   Master-uppsats, SLU/Dept. of Microbiology

   Författare :Anton Pallin; [2012]
   Nyckelord :dog; wolf; microbiota; Lactobacillus reuteri; probiotics;

   Sammanfattning : Since the first wolf was taken as a companion animal a lot have happened with the biology of these animals. Is it possible that changes in the gut microbiota of the domestic dog are involved in the increasing numbers of animals with gastrointestinal disorders? Probiotics have been proven to promote the immune system of dogs by increasing concentrations of neutrophils and monocytes, decreasing the fragility of erythrocytes and increasing the serum IgG concentrations. LÄS MER