Sökning: "Kumar Ray"

Hittade 5 uppsatser innehållade orden Kumar Ray.

  1. 1. Measuring the [C II]-to-H I connection in high-redshift absorption-selected galaxies

    Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

    Författare :Gaurav Senthil Kumar; [2022]
    Nyckelord :QSO; Quasar; Black Hole; AGN; Active Galactic Nuclei; DLA; Damped Lyman Alpha; C II; [C II]; H I; Sightline; HST; X-shooter; Spectroscopy; Echelle Spectroscope; Hyperfine transition; Hyperfine; Physics and Astronomy;

    Sammanfattning : HI neutral gas is the basic building block of galaxies. It dictates the star formation rate and hence the metal enrichment rates within high redshift galaxies. HI neutral gas cannot be directly observed beyond z ≈ 0. LÄS MER

  3. 2. Changes in Gray cast iron over the last century-An initial study

    Master-uppsats, Lunds universitet/Industriell Produktion

    Författare :Puneeth Kumar Shivarudrappa; [2021]
    Nyckelord :Gray cast iron; age strengthening; and machinability.; Technology and Engineering;

    Sammanfattning : This thesis report summarizes the research on the cold aging of gray cast iron samples dating back 100 years, and how researchers looked at the phase history and amount of impurities and trace metals generated by recycling. Initially, the topic of the thesis is introduced, with an explanation and general information on gray cast iron. LÄS MER

  4. 3. Saving Energy in Cellular IoT using Low-Power Wake-up Radios

    Master-uppsats, Lunds universitet/Institutionen för elektro- och informationsteknik

    Författare :Ratna Pavan Kumar Ponna; Dripta Ray; [2018]
    Nyckelord :Technology and Engineering;

    Sammanfattning : The thesis work is based on power saving techniques to enhance the battery life of Machine Type Communication devices. The basic principle behind the introduced methods to save energy is to allow the Machine Type Communication devices only to perform its activities for a short time and go to sleep or inactive mode for rest of the time. LÄS MER

  5. 4. Cellulosasyntesgener i två Populusarter : släktskap och uttrycksmönster under vedbildning

    Kandidat-uppsats, SLU/Dept. of Forest Ecology and Management

    Författare :Jenny Dahl; Hilda Mikaelsson; [2016]
    Nyckelord :Populus trichocarpa; Populus tremula; genom; cellväggssyntes;

    Sammanfattning : Cellulosa är ett förnyelsebart material som är högaktuellt i dagens miljömedvetna samhälle. För att kunna nyttja den effektivt krävs kunskap om de processer som styr vedbildning och trädens tillväxt. LÄS MER

  7. 5. Development and potential applications of nanomaterials for arsenic removal from contaminated groundwater.

    Master-uppsats, KTH/Miljögeokemi och ekoteknik

    Författare :Rajender Kumar; [2011]
    Nyckelord :Iron oxide nanoparticles NPs ; surface modification; structural charcaterisation; Arsenic species;

    Sammanfattning : In this study, a magnetic nanomaterial was used for the binding of anionic arsenic species from contaminated groundwater. Iron oxide (Fe3O4) magnetic nanoparticles (NPs) and the surface modified Fe3O4 NPs with 3-aminopropyl-triethoxysilane (3-APTES), Trisodium citrare (TSC) and Chitosan were synthesized with the co-precipitation method. LÄS MER