Sökning: "urea"

Visar resultat 21 - 25 av 137 uppsatser innehållade ordet urea.

  1. 21. Bearing condition monitoring : An investigation on the possibility of monitoring aging of the lubricating grease by means of acoustic emission and temperature.

    Master-uppsats, Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

    Författare :Dilesh Raj Shrestha; [2021]
    Nyckelord :Acoustic Emission; Fourier Transform; Infrared Spectroscopy; Condition Monitoring; Total Acidic Number; Fast Fourier Transform; Scanning Electron Microscopy; Rheology; Bleed Oil; Grease degradation;

    Sammanfattning : Grease is among the most widely used lubricants in rolling element bearings. Proper understanding of the effect of lubrication due to grease aging can provide a significant increase in the life of the engineering systems. However, at present, there is no sufficient understanding of the grease aging effect in rolling elements bearing. LÄS MER

  3. 22. Effects of skin care ingredients on keratinocytes : - Interplay between osmotic stress, cell viability, and gene expression towards increased understanding of keratinocyte differentiation

    Master-uppsats, Malmö universitet/Fakulteten för hälsa och samhälle (HS)

    Författare :Kassem Awad; [2021]
    Nyckelord :Cell viability; Keratinocytes; Osmotic stress; qPCR; Skin; Water activity;

    Sammanfattning : The epidermis is composed of multiple cell strata where viable keratinocytes, in the basal layer (stratum basale (SB)), go through a range of steps with the final stage of being dead corneocytes in the outer most layer (stratum corneum (SC)). The differentiation, which can be thought of as programmed cell death, include several key processes that are essential for an intact skin barrier. LÄS MER

  4. 23. Fertiliser derived from human urine : novel media for alkaline urine dehydration

    Master-uppsats, SLU/Dept. of Energy and Technology

    Författare :Christopher Friedrich; [2021]
    Nyckelord :nutrient recovery; fertiliser; urine drying; source separation; magnesium oxide; calcium hydroxide;

    Sammanfattning : Every year, each human excretes approximately 4 kg of nitrogen, 1 kg of potassium and 0.3 kg of phosphorus through their urine. In conventional wastewater treatment, these nutrients are usually not recovered for agricultural production, although they can enhance plant growth. LÄS MER

  5. 24. SELECTIVE NON-CATALYTIC REDUCTION SYSTEM

    Master-uppsats, Högskolan i Gävle/Elektronik

    Författare :Sedat Polat; [2020]
    Nyckelord :;

    Sammanfattning : The aim of this thesis is to develop a Selective Non-Catalytic Reduction (SNCR) system which is based on a control system to keep NOx emissions from combustion by maximum 27 kg/h urea consumption and then perform commissioning on the site. The NOx value in the combustion is around 220 mg/Nm3 under 100% laud. LÄS MER

  7. 25. Urea’s ability to break the life cycle of Nematodirus spp. in situ : a field study on sheep in New Zealand

    Uppsats för yrkesexamina på avancerad nivå, SLU/Dept. of Clinical Sciences

    Författare :Carolina Falkman; [2020]
    Nyckelord :Nematodirus; Strongyles; sheep; nematodes; urea; nitrogen; anthelmintic; resistance;

    Sammanfattning : Nematodirus spp., along with other gastrointestinal nematodes, are a common cause of disease among sheep and remains a major animal health concern, and cause of reduced productivity for sheep farmers around the world. LÄS MER