Sökning: "Lighting"

Visar resultat 36 - 40 av 168 avhandlingar innehållade ordet Lighting.

  1. 36. Chlorophyll fluorescence as a biological feedback signal -for optimized plant growth conditions and stress diagnosis

    Författare :Linnéa Ahlman; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; cucumber; indoor farming; abiotic stress; Fluorescence gain; ESC; biotic stress; basil; dynamics; strawberries; light spectrum; greenhouse lighting control; lettuce; powdery mildew Podosphaera aphanis; Pythium ultimum; LED; classification; lemon balm;

    Sammanfattning : The use of light emitting diodes (LEDs) instead of traditional high pressure sodium lamps, in greenhouses and indoor growing facilities, enables tuning and optimization of both light intensity and light spectrum. This opens for an energy saving potential not possible otherwise. LÄS MER

  3. 37. Optical properties of point defects in insulators and of transition metal dichalcogenides

    Författare :Christopher Linderälv; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; luminescence quenching; charge transition levels; excitons; transition metal dichalcogenides; monolayer alloys; solid state lighting; color centers; oxygen vacancies; moiré structures; wide band gap oxides;

    Sammanfattning : There is a need for new or modified materials, both to improve current devices and to create novel functionalities. Engineering materials to target specific functionalities requires a better understanding of how microscopic processes impact materials properties. LÄS MER

  4. 38. Approaches for mitigating the environmental impact of greenhouse horticulture

    Författare :Karl-Johan Bergstrand; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Greenhouse horticulture creates environmental issues of different kinds. Use of energy for heating and lighting and pollution by pesticides and nutrients are major known problems, but impacts on the landscape and light emissions from supplementary lighting have also attracted attention. LÄS MER

  5. 39. How visual ergonomics interventions influence health and performance - with an emphasis on non-computer work tasks

    Författare :Hillevi Hemphälä; Ergonomi och aerosolteknologi; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; light; eye; eyestrain; vision; illuminance; spectacles; glasses; lenses; surgery; postal workers; operating theatres; sorting; post; mail; recycling; recycling facilities;

    Sammanfattning : Visual ergonomics evaluations and interventions were performed on non-computer work tasks at recycling facilities, post sorting facilities and operating theatres. The results can to some extent be applicable to other professions and workplaces. LÄS MER

  7. 40. Anden i lampan : etnologiska perspektiv på ljus och mörker

    Författare :Jan Garnert; Stockholms universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; Belysning-- Sverige; Belysning-- Historia -- Sverige;

    Sammanfattning : A tallow candle gives different illumination and has other qualities than a modern halogen lamp. But in what ways have women and men changed their conceptual worlds, lifestyles and habits as a result of switching from tallow candles to kerosene lamps and then to electric light?In The Genie of the Lamp I trace and describe the link between lighting as a context and cultural processes, in particular the way people in different times, in different kinds of society, and in different social groups have related to and organized time and space. LÄS MER