Search for dissertations about: "NEGATIVE DIFFERENTIAL RESISTANCE"

Showing result 1 - 5 of 28 swedish dissertations containing the words NEGATIVE DIFFERENTIAL RESISTANCE.

  2. 1. Novel III-V semiconductor tunnel structures grown by molecular beam epitaxy

    Author : Jan Söderström; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Electron tunneling; semiconductor heterostructures; Negative differential resistance NDR ;

    Abstract : .... READ MORE

  4. 2. Electron Tunneling and Field-Effect Devices in mm-Wave Circuits

    Author : Mikael Egard; Fasta tillståndets fysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; negative differential conductance oscillator; resonant tunneling diode; ultra-wideband; impulse radio; Wavelet generator; MOSFET; nanowire; high frequency characterization; Fysicumarkivet A:2012:Egard;

    Abstract : Short high-frequency electromagnetic pulses, also referred to as wavelets, are considered for use in various short-range impulse based ultra-wideband applications, such as communication, imaging, radar, spectroscopy, and localization. This thesis investigates field-effect and tunneling based semiconductor devices and their operation in millimeter-wave (mm-wave) impulse transceivers. READ MORE

  5. 3. Asymptomatic Bacteriuria. Protection against, and differential diagnosis towards symptomatic Urinary Tract Infection

    Author : Fredrik Sundén; Helsingborg Kliniska Vetenskaper; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES;

    Abstract : Urinary tract infections (UTIs) are among the most common infectious diseases in humans, with a subset of sus- ceptible individuals who experience recurrent episodes. e increase in antibiotic resistance in gram-negative uropathogens, due to antibiotic overuse, is a strong rationale for developing therapeutic alternatives and to improve diagnostics. READ MORE

  6. 4. Charge Sampling Circuits and A/D Converters - Theory and Experiments

    Author : Gang Xu; Institutionen för elektro- och informationsteknik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; pipelined A D converter; sigma-delta modulator; differential difference comparator; 2-step A D converter; FIR filter; analog filter; thermal noise; clock jitter; sub-sampling; RF sampling; current-mode sampling; Charge samling; A D converter; flexible A D converter; Electronics and Electrical technology; Elektronik och elektroteknik;

    Abstract : The analysis of general charge sampling technique is presented in this thesis. Charge sampling integrates input current instead of tracking input voltage to realize high speed and low voltage sampling. The analysis focuses on the performance of general charge sampling circuits for signal capture. READ MORE

  7. 5. Pulmonary tuberculosis and HIV interaction in a setting with a high prevalence of HIV : clinical, diagnostic and epidemiological aspects

    Author : Judith Bruchfeld; Karolinska Institutet; Karolinska Institutet; []
    Keywords : Tuberculosis; HIV; Ethiopia; Mycobacterium tuberculosis; diagnosis; direct microscopy; sodium hypochlorite; sputum concentration; epidemiology; DNA drug resistance; P. carinii; PCP.;

    Abstract : The overall aim of this study was to elucidate the influence of HIV infection on the occurrence, clinical presentation, diagnostic yield and transmission of M tuberculosis among consecutive out-patients with symptoms suggestive of PTB in a high TB and HIV endemic area. Among 509 consecutive out-patients attending a university hospital in Ethiopia, 33. READ MORE