Sökning: "Jian Li"

Hittade 4 avhandlingar innehållade orden Jian Li.

  1. 1. Mechanisms and regulations of priming effects in soil

    Författare :Jian Li; MEMEG; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Soil organic matter (SOM) plays a significant role in the global carbon (C) and nutrients cycles, not only since SOM is a major storage reservoir of C and plant nutrients, but also since microbial decomposition of SOM releases large quantities of CO2 to the atmosphere. The accelerated or reduced turnover rate of SOM after the input of labile C compounds is a phenomenon known as the priming effect (PE). LÄS MER

  3. 2. Spontaneous correction of fracture deformity : a study in the rat

    Författare :Jian Li; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Fracture healing; bone modeling; bone turnover; GAP-43; PGP 9.5; CGRP;

    Sammanfattning : The aim of the present study was to elaborate a model in the rat permitting analysis of bone modeling to correct fracture deformity. Among conceivable regulators of this process, the study focused on the peripheral nervous system by analyzing markers of regenerating (GAP-43), mature (PGP 9.5) and sensory (CGRP) nerve fibers at the fracture site. LÄS MER

  4. 3. Low Noise Oscillator in ADPLL toward Direct-to-RF All-digital Polar Transmitter

    Författare :Jian Chen; Li-Rong Zheng; Fredrik Jonsson; Hannu Tenhunen; Georges Gielen; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; all-digital; digitally-intensive; frequency modualtion; phase modulation; amplitude modulation; polar; transmitter; oscillator; digital controled oscillator; DCO; VCO; voltage controled oscillator; class-C oscillator; class-D PA; ADPLL; phase noise; RF; CMOS.;

    Sammanfattning : In recent years all-digital or digitally-intensive RF transmitters (TX) have attracted great attention in both literature and industry. The motivation is to implement RF circuits in a manner suiting advanced nanometer CMOS processes. To achieve that, information is encoded in the time-domain rather than voltage amplitude. LÄS MER

  5. 4. First-principles study of materials for advanced energy technology

    Författare :Xiaojie Li; Levente Vitos; Jian Sun; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials Science and Engineering; Teknisk materialvetenskap;

    Sammanfattning : The present thesis addresses promising material solutions for fusion reactors from a theoretical point of view. We focus on two specific systems: W-based alloys used as plasma-facing materials and reduced activation ferritic/martensitic (RAFM) steels used as structural materials of breeding-blanket. LÄS MER