Sökning: "gain measurements"

Visar resultat 1 - 5 av 388 avhandlingar innehållade orden gain measurements.

1. 1. MIMO Channels - Measurements and Analysis

   Författare :Peter Almers; Institutionen för elektro- och informationsteknik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Signalbehandling; Telecommunication engineering; Telekommunikationsteknik; Electrical engineering; Elektroteknik; Signal processing; Teknik; Capacity; Technological sciences; Spatial-multiplexing; Diversity; Measurements; MIMO; Wireless; Communications;

   Sammanfattning : Providing increased transmission speed, quality and an efficient spectrum utilization is crucial for high speed wireless services of today and the future. This thesis is a collection of papers that address an important step in that direction -- the utilization of the spatial domain of the wireless channel. LÄS MER

3. 2. Dental Anxiety: prevalence, measurements and consequences

   Författare :Lisa Svensson; Göteborgs universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; dental anxiety; adults; prevalence; oral health; oral health-related quality of life; dental pain; measurements; validity; dental phobia;

   Sammanfattning : The overall aim of this thesis was to gain knowledge about adults suffering from dental anxiety by studying the current prevalence of dental anxiety and concomitant factors, the impact of dental pain on everyday life among individuals suffering from severe dental anxiety, and to evaluate the validity of a psychometric measurement, the IDAF-4C+, used to measure the level of dental anxiety and to screen for a diagnosis of specific phobia for dentistry. The included studies have a cross-sectional design. LÄS MER

4. 3. Understanding spirituality and religiosity among very old people : measurements and experiences

   Författare :Catharina Norberg; Kristina Lämås; Regina Santamäki Fisher; Ulf Isaksson; Lisbeth Fagerström; Umeå universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Aged 80 and older; Sweden; spirituality; self-transcendence; Self-transcendence Scale; Religious Orientation Scale; religiosity; psychometrics; experiences; Umeå 85 GERDA; caring sciences in social sciences; omvårdnadsforskning med samhällsvetenskaplig inriktning;

   Sammanfattning : Background: Spirituality is a multifaceted concept. In this thesis, spirituality is understood as an overarching term and a core of a person´s being. Religiosity is seen as one of many expressions of spirituality. Very old people are a vulnerable population, with an increased risk to be exposed to negative life events. LÄS MER

5. 4. Solar Shading for Low Energy Use and Daylight Quality in Offices: Simulations, Measurements and Design Tools

   Författare :Marie-Claude Dubois; Avdelningen för Energi och byggnadsdesign; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Byggnadsteknik; Building construction; screens; venetian blinds; awnings; design tools; measurements; computer simulations; solar-protective glass; heating; cooling; visual comfort; daylighting; energy use; Shading devices; solar protection; Architecture; interior design; Arkitektur; inredningsarkitektur; Energy research; Energiforskning;

   Sammanfattning : This thesis investigates the impact of solar shading devices on energy use and daylight quality in office rooms. The impact on energy use is analysed through computer simulations with the dynamic energy simulation program Derob-LTH while the impact on daylight quality is investigated through measurements in full-scale experimental office rooms and simulations with the program Radiance. LÄS MER

7. 5. Low Frequency Impact Sound in Timber Buildings : Transmission Measurements and Simulations

   Författare :Jörgen Olsson; Andreas Linderholt; Börje Nilsson; Carl Hopkins; Linnéuniversitetet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Timber floors; FE-simulations; Light weight floors; Frequency response functions; Building acoustics; Byggteknik; Civil engineering;

   Sammanfattning : An increased share of multi-story buildings that have timber structures entails potential in terms of increased sustainability as well as human-friendly manufacturing and habitation. Timber buildings taller than two stories were prohibited in Europe until the 1990s due to fire regulations. In 1994, this prohibition was removed in Sweden. LÄS MER