Sökning: "low density"

Visar resultat 1 - 5 av 1511 avhandlingar innehållade orden low density.

  1. 1. Low-density parity-check codes unequal error protection and reduction of clipping effects

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Sara Sandberg; [2009]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Signalbehandling; Signal Processing;

    Sammanfattning : The invention of low-density parity-check (LDPC) codes made reliable communication possible at transmission rates very close to the theoretical limit predicted by Shannon. However, communication close to the Shannon limit requires very long codes and results in long delay and high encoder and decoder complexity. LÄS MER

  2. 2. Low-Density Lipoprotein Oxidation and Renal Dysfunction New Markers of Poor Prognosis in Patients with Unstable Coronary Artery Disease

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Nina Johnston; Lars Wallentin; Tomas Jernberg; Agneta Siegbahn; Lena Jonasson; [2006]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Medicine; myocardial infarction; unstable angina; oxidized low-density lipoprotein; renal function; prognosis; Medicin; MEDICINE Dermatology and venerology; clinical genetics; internal medicine; MEDICIN Dermatologi och venerologi; klinisk genetik; invärtesmedicin;

    Sammanfattning : In patients with unstable coronary artery disease (CAD) biochemical markers are emerging as useful tools in clinical management. In this thesis we studied the use of markers of low-density lipoprotein (LDL) oxidation and renal function. LÄS MER

  3. 3. Low-Power Low-Jitter Clock Generation and Distribution

    Detta är en avhandling från Linköping : Linköping University Electronic Press

    Författare :Behzad Mesgarzadeh; Atila Alvandpour; Thucydides Xanthopoulos; [2008]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Low-power; resonant clock distribution; injection locking; DLL-based clock generation; jitter suppression; CMOS; TECHNOLOGY Electrical engineering; electronics and photonics Electronics; TEKNIKVETENSKAP Elektroteknik; elektronik och fotonik Elektronik;

    Sammanfattning : Today’s microprocessors with millions of transistors perform high-complexitycomputing at multi-gigahertz clock frequencies. Clock generation and clockdistribution are crucial tasks which determine the overall performance of amicroprocessor. LÄS MER

  4. 4. Novel approaches for achieving full density powder metallurgy steels

    Detta är en avhandling från Linköping : Linköping University Electronic Press

    Författare :Maheswaran Vattur Sundaram; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cr- and Mo-alloyed PM steels; vacuum sintering; high density; full density; hot isostatic pressing.; cold isostatic pressing; liquid phase sintering; master alloy; double pressing-double sintering; powder metallurgy steels; sintering; water atomised powder;

    Sammanfattning : Powder metallurgy (PM) is one of the most resource-efficient methods for manufacturing structural components with complex shapes. The utilisation of the metal powder to shape the components allows to minimise material waste and increase energy efficiency. LÄS MER

  5. 5. Sound Insulation at Low Frequencies

    Detta är en avhandling från Linköping : Linköping University Electronic Press

    Författare :Andrzej Pietrzyk; [1997]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Finite Element Method; numerical simulations; Modal Approach; sound insulation; sound reduction index; low frequency; building partitions;

    Sammanfattning : The airborne sound transmission through building partitions at low frequencies was studied. The definition of the sound reduction index as a measure of sound insulation has been examined by means of extensive numerical simulations in 3-D domains. The simulations were based on the wave theoretical acoustics. LÄS MER