Search for dissertations about: "CHA"

Showing result 1 - 5 of 21 swedish dissertations containing the word CHA.

  1. 1. Airborne Particles in Railway Tunnels

    Author : Yingying Cha; Ulf Olofsson; Roy Harrison; KTH; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER;

    Abstract : .... READ MORE

  2. 2. InP High Electron Mobility Transistor Design for Cryogenic Low Noise Amplifiers

    Author : Eunjung Cha; Chalmers University of Technology; []
    Keywords : cryogenic; stability; noise temperature; InP HEMT; LNA; MMIC;

    Abstract : The InGaAs/InAlAs/InP high electron mobility transistor (InP HEMT) is the superior technology for the most demanding low-noise and high-speed microwave and millimeter-wave applications, in particular in radio astronomy and deep-space communication. InP HEMT has enabled cryogenic low noise amplifier (LNA) designs with noise temperatures about ten times the quantum noise limit from sub  GHz up to 120 GHz. READ MORE

  3. 3. InP High Electron Mobility Transistors for Cryogenic Low-Noise and Low-Power Amplifiers

    Author : Eunjung Cha; Chalmers University of Technology; []
    Keywords : dc power dissipation; cryogenic; InP high-electron mobility transistor InP HEMT ; noise temperature; low-noise amplifier LNA ; scaling; electrical stability.; indium channel content;

    Abstract : The InAlAs/InGaAs/InP high-electron mobility transistor (InP HEMT) is the preferred low-noise device in cryogenic low-noise amplifiers (LNAs) operating at 5-15 K. Such LNAs are utilized in microwave and millimeter-wave detection in radio astronomy. READ MORE

  4. 4. Dynamic Performance and Design Aspects of Compliant Fluid Film Bearings

    Author : Matthew Cha; Sergei Glavatskih; Kyung-Woong Kim; KTH; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Compliant bearing; dynamic performance; design aspects; Machine Design; Maskinkonstruktion;

    Abstract : Due to government regulations together with health and safety reasons, there are increasing demands on reducing hazardous polluting chemicals from fossil fuel power plants. Therefore, more efforts are imposed on using renewable resources such as water, wind, solar and tide to produce clean/green electricity. READ MORE

  5. 5. Nonlinear Isoviscous Behaviour of Compliant Journal Bearings

    Author : Matthew Cha; Sergei Glavatskih; Ilmar Santos; KTH; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Compliant Journal Bearings;

    Abstract : Plans to shut down nuclear power plants in some European countries as well as increased electricity production by wind and solar power will increase the work load on hydroelectric power plants in the future. Also, due to the power grid regulations, hydroelectric power plants undergo more frequent start-ups and shut-downs. READ MORE