Essays about: "difference frequency generation"

Showing result 21 - 25 of 28 essays containing the words difference frequency generation.

  1. 21. Generation of tunable broadband deep ultraviolet radiation from gaseous media using ultrashort laser pulses.

    University essay from Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

    Author : Esben Witting Larsen; [2011]
    Keywords : Physics and Astronomy;

    Abstract : Most modern ultrafast lasers are based on mode-locked fiber or solid-state lasers and operate around the near infrared part of the electromagnetic spectrum. The widely spread CPA based Titanium Sapphire lasers can emit pulses centred around 800nm with durations down to 20 fs. READ MORE

  3. 22. Multihop Concept in Cellular Systems

    University essay from Institutionen för teknik och byggd miljö

    Author : Kiran Rangineni; [2008]
    Keywords : Multihop; Cellular; Capacity and Throughput.; Relay station; IEEE 802.16j; WiMAX; MAC; PHY; OFDM; OFDMA; Coverage;

    Abstract : We are very thirsty in terms of everything to fulfil our needs in a sophisticated way, and this leads me choose the so called master thesis titled “Multihop Concept in Cellular Systems”. This thesis introduces an approach towards the integration of relaying or multihop scheme in the next generation of cellular networks. READ MORE

  4. 23. Antibiotikaresistens hos bakterier isolerade från friska hundar i Sverige : indikatorbakterier E. coli & Enterococcus spp samt Staphylococcus spp isolerade från hud

    University essay from SLU/Dept. of Biomedical Sciences and Veterinary Public Health

    Author : Johanna Zwenson; [2007]
    Keywords : cephalosporin; antimikrobiell resistens; hund; frisk hund; antibiotika; MRSA; MRSI; E. coli;

    Abstract : Objective: To determine the frequency of antimicrobial resistance in bacteria from healthy Swedish dogs and whether they are carriers of methicillinresistant Staphylococcus aureus (MRSA). Material: Samples from skin from the perineal region and from faeces collected in the anus with cottonswab (Copan) from 299 healthy Swedish dogs. READ MORE

  5. 24. Investigation of an optimal utilization of Ultra-wide band measurements for position purposes

    University essay from Institutionen för informationsteknologi

    Author : Vishnu Vardhan Siripi; [2006]
    Keywords : Ultra-wideband; interference cancellation; TDOA algorithm;

    Abstract : Ultra wideband (UWB) communication systems refers to systems whose bandwidth is many times greater than the “narrowband” systems (refers to a signal which occupies only small amount of space on the radio spectrum). UWB can be used for indoor, communications for high data rates, or very low data rates for substantial link distances because of the extremely large bandwidth, immune to multi-path fading, penetrations through concrete block or obstacles. READ MORE

  6. 25. Speaker that uses the non-linearity in air to create sound

    University essay from Blekinge Tekniska Högskola/Avdelningen för maskinteknik

    Author : Johan Fredin; [2005]
    Keywords : Parametric loudspeaker; Difference frequency generation; Biharmonic boundary condition; Nonlinear acoustics;

    Abstract : The aim of this work was to investigate theoretically and experimentally the fact that it is possible to create sound by using the nonlinearity in air. A speaker was built verifying the theory that if at least two high frequencies at high amplitude is propagating through a nonlinear medium, for example air, the difference frequency of these two is created in mid air. READ MORE