The Experts below are selected from a list of 37689 Experts worldwide ranked by ideXlab platform
Jørn Toftum - One of the best experts on this subject based on the ideXlab platform.
-
differences between young adults and elderly in thermal comfort productivity and thermal physiology in response to a moderate Temperature Drift and a steady state condition
Indoor Air, 2010Co-Authors: Lisje Schellen, Van Wd Wouter Marken Lichtenbelt, Mglc Marcel Loomans, Jørn ToftumAbstract:Results from naturally ventilated buildings show that allowing the indoor Temperature to Drift does not necessarily result in thermal discomfort and may allow for a reduction in energy use. However, for stationary conditions, several studies indicate that the thermal neutral Temperature and optimum thermal condition differ between young adults and elderly. There is a lack of studies that describe the effect of aging on thermal comfort and productivity during a moderate Temperature Drift. In this study, the effect of a moderate Temperature Drift on physiological responses, thermal comfort, and productivity of eight young adults (age 22–25 year) and eight older subjects (age 67–73 year) was investigated. They were exposed to two different conditions: S1-a control condition; constant Temperature of 21.5°C; duration: 8 h; and S2-a transient condition; Temperature range: 17–25°C, duration: 8 h, Temperature Drift: first 4 h: +2 K/h, last 4 h: –2 K/h. The results indicate that thermal sensation of the elderly was, in general, 0.5 scale units lower in comparison with their younger counterparts. Furthermore, the elderly showed more distal vasoconstriction during both conditions. Nevertheless, TS of the elderly was related to air Temperature only, while TS of the younger adults also was related to skin Temperature. During the constant Temperature session, the elderly preferred a higher Temperature in comparison with the young adults. Practical Implications Because the stock of fossil fuels is limited, energy savings play an important role. Thermal comfort is one of the most important performance indicators to successfully apply measures to reduce the energy need in buildings. Allowing Drifts in indoor Temperature is one of the options to reduce the energy demand. This study contributes to the knowledge concerning the effects of a moderate Temperature Drift and the age of the inhabitants on their thermal comfort.
-
Differences between young adults and elderly in thermal comfort, productivity, and thermal physiology in response to a moderate Temperature Drift and a steady-state condition
Indoor Air, 2010Co-Authors: Lisje Schellen, W. D. Van Marken Lichtenbelt, M. G L C Loomans, Jørn Toftum, M. H. De WitAbstract:UNLABELLED: Results from naturally ventilated buildings show that allowing the indoor Temperature to Drift does not necessarily result in thermal discomfort and may allow for a reduction in energy use. However, for stationary conditions, several studies indicate that the thermal neutral Temperature and optimum thermal condition differ between young adults and elderly. There is a lack of studies that describe the effect of aging on thermal comfort and productivity during a moderate Temperature Drift. In this study, the effect of a moderate Temperature Drift on physiological responses, thermal comfort, and productivity of eight young adults (age 22-25 year) and eight older subjects (age 67-73 year) was investigated. They were exposed to two different conditions: S1-a control condition; constant Temperature of 21.5 degrees C; duration: 8 h; and S2-a transient condition; Temperature range: 17-25 degrees C, duration: 8 h, Temperature Drift: first 4 h: +2 K/h, last 4 h: -2 K/h. The results indicate that thermal sensation of the elderly was, in general, 0.5 scale units lower in comparison with their younger counterparts. Furthermore, the elderly showed more distal vasoconstriction during both conditions. Nevertheless, TS of the elderly was related to air Temperature only, while TS of the younger adults also was related to skin Temperature. During the constant Temperature session, the elderly preferred a higher Temperature in comparison with the young adults.\n\nPRACTICAL IMPLICATIONS: Because the stock of fossil fuels is limited, energy savings play an important role. Thermal comfort is one of the most important performance indicators to successfully apply measures to reduce the energy need in buildings. Allowing Drifts in indoor Temperature is one of the options to reduce the energy demand. This study contributes to the knowledge concerning the effects of a moderate Temperature Drift and the age of the inhabitants on their thermal comfort.
-
thermal comfort physiological responses and performance during exposure to a moderate Temperature Drift
11th International Conference on Indoor Air Quality and Climate, 2008Co-Authors: Lisje Schellen, W. D. Van Marken Lichtenbelt, M. G L C Loomans, Martin De Wit, Arjan Friins, Jørn ToftumAbstract:SUMMARY The objective of this research was to study the effects of a moderate Temperature Drift on human thermal comfort, physiological responses, productivity and performance. A dynamic thermophysiological model was used to examine the possibility of simulating human thermal responses and thermal comfort under moderate transient conditions. To examine the influence of a moderate Temperature ramp, a climate room set-up with experimental subjects was used. Eight subjects visited the climate room on two occasions: 1) exposure to a transient condition (a moderate Temperature ramp) and 2) a steady Temperature corresponding with a neutral thermal sensation (control situation). During the experiments both physiological responses and thermal sensation were measured. Productivity and performance were assessed with a ‘Remote Performance Measurement’ (RPM) method. Physiological and thermal sensation data indicate significant differences between the transient condition and the control situation. Productivity and performance tests show no significant changes between the two situations. Simulations obtained with the thermophysiological model were in good agreement with the measurements. Possible improvements of the performance and productivity tests and the thermophysiological model will be discussed.
Lisje Schellen - One of the best experts on this subject based on the ideXlab platform.
-
differences between young adults and elderly in thermal comfort productivity and thermal physiology in response to a moderate Temperature Drift and a steady state condition
Indoor Air, 2010Co-Authors: Lisje Schellen, Van Wd Wouter Marken Lichtenbelt, Mglc Marcel Loomans, Jørn ToftumAbstract:Results from naturally ventilated buildings show that allowing the indoor Temperature to Drift does not necessarily result in thermal discomfort and may allow for a reduction in energy use. However, for stationary conditions, several studies indicate that the thermal neutral Temperature and optimum thermal condition differ between young adults and elderly. There is a lack of studies that describe the effect of aging on thermal comfort and productivity during a moderate Temperature Drift. In this study, the effect of a moderate Temperature Drift on physiological responses, thermal comfort, and productivity of eight young adults (age 22–25 year) and eight older subjects (age 67–73 year) was investigated. They were exposed to two different conditions: S1-a control condition; constant Temperature of 21.5°C; duration: 8 h; and S2-a transient condition; Temperature range: 17–25°C, duration: 8 h, Temperature Drift: first 4 h: +2 K/h, last 4 h: –2 K/h. The results indicate that thermal sensation of the elderly was, in general, 0.5 scale units lower in comparison with their younger counterparts. Furthermore, the elderly showed more distal vasoconstriction during both conditions. Nevertheless, TS of the elderly was related to air Temperature only, while TS of the younger adults also was related to skin Temperature. During the constant Temperature session, the elderly preferred a higher Temperature in comparison with the young adults. Practical Implications Because the stock of fossil fuels is limited, energy savings play an important role. Thermal comfort is one of the most important performance indicators to successfully apply measures to reduce the energy need in buildings. Allowing Drifts in indoor Temperature is one of the options to reduce the energy demand. This study contributes to the knowledge concerning the effects of a moderate Temperature Drift and the age of the inhabitants on their thermal comfort.
-
Differences between young adults and elderly in thermal comfort, productivity, and thermal physiology in response to a moderate Temperature Drift and a steady-state condition
Indoor Air, 2010Co-Authors: Lisje Schellen, W. D. Van Marken Lichtenbelt, M. G L C Loomans, Jørn Toftum, M. H. De WitAbstract:UNLABELLED: Results from naturally ventilated buildings show that allowing the indoor Temperature to Drift does not necessarily result in thermal discomfort and may allow for a reduction in energy use. However, for stationary conditions, several studies indicate that the thermal neutral Temperature and optimum thermal condition differ between young adults and elderly. There is a lack of studies that describe the effect of aging on thermal comfort and productivity during a moderate Temperature Drift. In this study, the effect of a moderate Temperature Drift on physiological responses, thermal comfort, and productivity of eight young adults (age 22-25 year) and eight older subjects (age 67-73 year) was investigated. They were exposed to two different conditions: S1-a control condition; constant Temperature of 21.5 degrees C; duration: 8 h; and S2-a transient condition; Temperature range: 17-25 degrees C, duration: 8 h, Temperature Drift: first 4 h: +2 K/h, last 4 h: -2 K/h. The results indicate that thermal sensation of the elderly was, in general, 0.5 scale units lower in comparison with their younger counterparts. Furthermore, the elderly showed more distal vasoconstriction during both conditions. Nevertheless, TS of the elderly was related to air Temperature only, while TS of the younger adults also was related to skin Temperature. During the constant Temperature session, the elderly preferred a higher Temperature in comparison with the young adults.\n\nPRACTICAL IMPLICATIONS: Because the stock of fossil fuels is limited, energy savings play an important role. Thermal comfort is one of the most important performance indicators to successfully apply measures to reduce the energy need in buildings. Allowing Drifts in indoor Temperature is one of the options to reduce the energy demand. This study contributes to the knowledge concerning the effects of a moderate Temperature Drift and the age of the inhabitants on their thermal comfort.
-
thermal comfort physiological responses and performance during exposure to a moderate Temperature Drift
11th International Conference on Indoor Air Quality and Climate, 2008Co-Authors: Lisje Schellen, W. D. Van Marken Lichtenbelt, M. G L C Loomans, Martin De Wit, Arjan Friins, Jørn ToftumAbstract:SUMMARY The objective of this research was to study the effects of a moderate Temperature Drift on human thermal comfort, physiological responses, productivity and performance. A dynamic thermophysiological model was used to examine the possibility of simulating human thermal responses and thermal comfort under moderate transient conditions. To examine the influence of a moderate Temperature ramp, a climate room set-up with experimental subjects was used. Eight subjects visited the climate room on two occasions: 1) exposure to a transient condition (a moderate Temperature ramp) and 2) a steady Temperature corresponding with a neutral thermal sensation (control situation). During the experiments both physiological responses and thermal sensation were measured. Productivity and performance were assessed with a ‘Remote Performance Measurement’ (RPM) method. Physiological and thermal sensation data indicate significant differences between the transient condition and the control situation. Productivity and performance tests show no significant changes between the two situations. Simulations obtained with the thermophysiological model were in good agreement with the measurements. Possible improvements of the performance and productivity tests and the thermophysiological model will be discussed.
V N Sorokin - One of the best experts on this subject based on the ideXlab platform.
-
Temperature Drift rate for nuclear terms of the nv center ground state hamiltonian
Physical Review B, 2020Co-Authors: Vladimir V Soshenko, Vadim V Vorobyov, Stepan V Bolshedvorskii, Olga R Rubinas, Ivan Cojocaru, Boris Kudlatsky, Anton I Zeleneev, V N SorokinAbstract:The nitrogen-vacancy (NV) center in diamond has been found to be a powerful tool for various sensing applications. In particular, in ensemble-based sensors, the main ``workhorse'' so far has been optically detected electron resonance. Utilization of the nuclear spin has the potential to significantly improve sensitivity in rotation and magnetic field sensors. Ensemble-based sensors consume a substantial amount of power, leading to noticeable heating of the diamond and thus requiring an understanding of Temperature-related shifts. In this paper, we provide a detailed study of the Temperature shift of the hyperfine components of the NV center.
M. H. De Wit - One of the best experts on this subject based on the ideXlab platform.
-
Differences between young adults and elderly in thermal comfort, productivity, and thermal physiology in response to a moderate Temperature Drift and a steady-state condition
Indoor Air, 2010Co-Authors: Lisje Schellen, W. D. Van Marken Lichtenbelt, M. G L C Loomans, Jørn Toftum, M. H. De WitAbstract:UNLABELLED: Results from naturally ventilated buildings show that allowing the indoor Temperature to Drift does not necessarily result in thermal discomfort and may allow for a reduction in energy use. However, for stationary conditions, several studies indicate that the thermal neutral Temperature and optimum thermal condition differ between young adults and elderly. There is a lack of studies that describe the effect of aging on thermal comfort and productivity during a moderate Temperature Drift. In this study, the effect of a moderate Temperature Drift on physiological responses, thermal comfort, and productivity of eight young adults (age 22-25 year) and eight older subjects (age 67-73 year) was investigated. They were exposed to two different conditions: S1-a control condition; constant Temperature of 21.5 degrees C; duration: 8 h; and S2-a transient condition; Temperature range: 17-25 degrees C, duration: 8 h, Temperature Drift: first 4 h: +2 K/h, last 4 h: -2 K/h. The results indicate that thermal sensation of the elderly was, in general, 0.5 scale units lower in comparison with their younger counterparts. Furthermore, the elderly showed more distal vasoconstriction during both conditions. Nevertheless, TS of the elderly was related to air Temperature only, while TS of the younger adults also was related to skin Temperature. During the constant Temperature session, the elderly preferred a higher Temperature in comparison with the young adults.\n\nPRACTICAL IMPLICATIONS: Because the stock of fossil fuels is limited, energy savings play an important role. Thermal comfort is one of the most important performance indicators to successfully apply measures to reduce the energy need in buildings. Allowing Drifts in indoor Temperature is one of the options to reduce the energy demand. This study contributes to the knowledge concerning the effects of a moderate Temperature Drift and the age of the inhabitants on their thermal comfort.
Vadim V Vorobyov - One of the best experts on this subject based on the ideXlab platform.
-
Temperature Drift rate for nuclear terms of the nv center ground state hamiltonian
Physical Review B, 2020Co-Authors: Vladimir V Soshenko, Vadim V Vorobyov, Stepan V Bolshedvorskii, Olga R Rubinas, Ivan Cojocaru, Boris Kudlatsky, Anton I Zeleneev, V N SorokinAbstract:The nitrogen-vacancy (NV) center in diamond has been found to be a powerful tool for various sensing applications. In particular, in ensemble-based sensors, the main ``workhorse'' so far has been optically detected electron resonance. Utilization of the nuclear spin has the potential to significantly improve sensitivity in rotation and magnetic field sensors. Ensemble-based sensors consume a substantial amount of power, leading to noticeable heating of the diamond and thus requiring an understanding of Temperature-related shifts. In this paper, we provide a detailed study of the Temperature shift of the hyperfine components of the NV center.
