The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Yuguo Li - One of the best experts on this subject based on the ideXlab platform.
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development of a three dimensional urban energy model for predicting and understanding Surface Temperature Distribution
Boundary-Layer Meteorology, 2013Co-Authors: Xinyan Yang, Yuguo LiAbstract:The Model for Urban Surface Temperature, a three-dimensional approach, is developed for a realistically complex city with considerations of the energy exchange processes at the urban Surface. The discrete transfer method and Gebhart absorption factor method are used for the shape factor estimation and multiple reflection calculation, respectively. The Surface energy balance model is evaluated against existing field measurements that pertain to idealized urban geometry. It performs well in terms of predicting Surface Temperature and heat fluxes by allowing for detailed urban Surface properties and meteorological conditions. The compressed row storage scheme is applied to calculate the transfer of Surface thermal radiation, which dramatically reduces the computational requirements. This strategy permits the rigorous consideration of multiple reflections in a realistic urban area with hundreds of buildings. The result illustrates that considering only the first reflection is a good approach when the urban area is comprised of typical urban materials, e.g. materials with high emissivity and low albedo, because relatively accurate computational results can be obtained rapidly by avoiding the multiple reflection calculation.
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predicting and understanding temporal 3d exterior Surface Temperature Distribution in an ideal courtyard
Building and Environment, 2012Co-Authors: Xinyan Yang, Yuguo Li, Lina YangAbstract:Abstract Micro-scale heat island phenomenon refers to the Temperature rise of a micro-scale built area, e.g. a street, a square and/or even an urban district above the ambient air over the area. This paper presents a simple temporal 3D air and Surface Temperature model for an ideal courtyard, which is a semi-enclosed open space surrounded by buildings. The prediction model includes the transient heat conduction in the ground and through the buildings walls, the heat removal/addition by courtyard ventilation, and detailed solar radiation and thermal radiation exchanges between Surfaces. The air Temperature in the courtyard and its Surface Temperature Distribution can be analyzed minute by minute within a day or during a longer period if the temporal ambient air Temperature and weather data are given. We simulated a courtyard located in Beijing. The solar radiation and the urban structures are found to be the most important factors in determining the courtyard thermal environment during both summer and winter. The thermal properties of the building walls also play a significant role. The results are revealing in developing effective methods for mitigating or managing micro heat island, and control thermal environment in a courtyard.
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Surface Temperature Distribution of Chinese Kangs
International Journal of Green Energy, 2010Co-Authors: Hua Qian, Yuguo Li, Xiao-song ZhangAbstract:This study is attempted to improve local thermal comfort of Chinese kang through improving the uniformity of the faceplate Temperature Distribution using computational fluid dynamics simulations. The faceplate Temperature of kangs is determined by the heat input to the kangs, the smoke flows, and the kang body materials. The smoke flow rate and the kang body Temperature are coupled. The Distribution of the faceplate Temperature is determined by the interior structure and smoke flow path design. In addition to a recent experimental study using infrared thermal imaging, this study uses computational fluid dynamics simulations to analyze in detail the heat transfer and smoke flow processes in a typical Chinese kang. Different design methods for improving Temperature Distribution of the kang faceplate are compared. Our results show that the Temperature Distribution on the faceplate of kang can be made to be more even using simple variations in its design.
Pierre Gentine - One of the best experts on this subject based on the ideXlab platform.
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impact of soil moisture atmosphere interactions on Surface Temperature Distribution
Journal of Climate, 2014Co-Authors: Alexis Berg, Benjamin R Lintner, Kirsten L Findell, Sergey Malyshev, Paul C Loikith, Pierre GentineAbstract:AbstractUnderstanding how different physical processes can shape the probability Distribution function (PDF) of Surface Temperature, in particular the tails of the Distribution, is essential for the attribution and projection of future extreme Temperature events. In this study, the contribution of soil moisture–atmosphere interactions to Surface Temperature PDFs is investigated. Soil moisture represents a key variable in the coupling of the land and atmosphere, since it controls the partitioning of available energy between sensible and latent heat flux at the Surface. Consequently, soil moisture variability driven by the atmosphere may feed back onto the near-Surface climate—in particular, Temperature. In this study, two simulations of the current-generation Geophysical Fluid Dynamics Laboratory (GFDL) Earth System Model, with and without interactive soil moisture, are analyzed in order to assess how soil moisture dynamics impact the simulated climate. Comparison of these simulations shows that soil moist...
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Impact of Soil Moisture–Atmosphere Interactions on Surface Temperature Distribution
Journal of Climate, 2014Co-Authors: Alexis Berg, Benjamin R Lintner, Kirsten L Findell, Sergey Malyshev, Paul C Loikith, Pierre GentineAbstract:AbstractUnderstanding how different physical processes can shape the probability Distribution function (PDF) of Surface Temperature, in particular the tails of the Distribution, is essential for the attribution and projection of future extreme Temperature events. In this study, the contribution of soil moisture–atmosphere interactions to Surface Temperature PDFs is investigated. Soil moisture represents a key variable in the coupling of the land and atmosphere, since it controls the partitioning of available energy between sensible and latent heat flux at the Surface. Consequently, soil moisture variability driven by the atmosphere may feed back onto the near-Surface climate—in particular, Temperature. In this study, two simulations of the current-generation Geophysical Fluid Dynamics Laboratory (GFDL) Earth System Model, with and without interactive soil moisture, are analyzed in order to assess how soil moisture dynamics impact the simulated climate. Comparison of these simulations shows that soil moist...
Xinyan Yang - One of the best experts on this subject based on the ideXlab platform.
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development of a three dimensional urban energy model for predicting and understanding Surface Temperature Distribution
Boundary-Layer Meteorology, 2013Co-Authors: Xinyan Yang, Yuguo LiAbstract:The Model for Urban Surface Temperature, a three-dimensional approach, is developed for a realistically complex city with considerations of the energy exchange processes at the urban Surface. The discrete transfer method and Gebhart absorption factor method are used for the shape factor estimation and multiple reflection calculation, respectively. The Surface energy balance model is evaluated against existing field measurements that pertain to idealized urban geometry. It performs well in terms of predicting Surface Temperature and heat fluxes by allowing for detailed urban Surface properties and meteorological conditions. The compressed row storage scheme is applied to calculate the transfer of Surface thermal radiation, which dramatically reduces the computational requirements. This strategy permits the rigorous consideration of multiple reflections in a realistic urban area with hundreds of buildings. The result illustrates that considering only the first reflection is a good approach when the urban area is comprised of typical urban materials, e.g. materials with high emissivity and low albedo, because relatively accurate computational results can be obtained rapidly by avoiding the multiple reflection calculation.
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predicting and understanding temporal 3d exterior Surface Temperature Distribution in an ideal courtyard
Building and Environment, 2012Co-Authors: Xinyan Yang, Yuguo Li, Lina YangAbstract:Abstract Micro-scale heat island phenomenon refers to the Temperature rise of a micro-scale built area, e.g. a street, a square and/or even an urban district above the ambient air over the area. This paper presents a simple temporal 3D air and Surface Temperature model for an ideal courtyard, which is a semi-enclosed open space surrounded by buildings. The prediction model includes the transient heat conduction in the ground and through the buildings walls, the heat removal/addition by courtyard ventilation, and detailed solar radiation and thermal radiation exchanges between Surfaces. The air Temperature in the courtyard and its Surface Temperature Distribution can be analyzed minute by minute within a day or during a longer period if the temporal ambient air Temperature and weather data are given. We simulated a courtyard located in Beijing. The solar radiation and the urban structures are found to be the most important factors in determining the courtyard thermal environment during both summer and winter. The thermal properties of the building walls also play a significant role. The results are revealing in developing effective methods for mitigating or managing micro heat island, and control thermal environment in a courtyard.
Guotai Jiang - One of the best experts on this subject based on the ideXlab platform.
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Fundamental theoretic research of thermal texture maps I - simulation and analysis of the relation between the depth of inner heat source and Surface Temperature Distribution in isotropy tissue
The 26th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2004Co-Authors: Zhigang Shang, Guotai JiangAbstract:Thermal texture maps is a new technology that can locate the inner abnormal heat sources of human by thermography analysis, and a great deal of application examples in clinic to early detect breast cancer with it shows its effectiveness. But the current explanation for its principle is hard to comprehensive and did not illuminate clearly the relation between the inner heat source and Surface Temperature Distribution. In this paper, the Temperature fields caused by the point heat source in isotropy tissue are simulated in different conditions, including different heat source intensities, different heat transfer coefficients and different heat depths and so on. The variation of Surface Temperature with the heat source depth change is discussed especially. The analysis result of simulation data shows that there lies the special relation between the heat source depth and the Surface Temperature Distribution.
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Dynamic analysis of inner metabolizing status based on the Surface Temperature Distribution of body
2001 Conference Proceedings of the 23rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2001Co-Authors: Zhigang Shang, Guotai JiangAbstract:Summary form only received as follows: This paper presents a new method to analyse dynamically the metabolizing status of the inner body on the basis of the body's Surface Temperature Distribution. The authors applied cold stimulation to the human body in a special place. They recorded the Surface Temperature Distribution by infrared thermography in the process of Temperature restoration after stimulation, and calculated the Temperature time sequence data obtained from thermography. They used the system identification method of system control theory to define the pulse response sequence of body Temperature control system. They then judged the inner metabolism function as normal or abnormal by analyzing that pulse response sequence.
Alexis Berg - One of the best experts on this subject based on the ideXlab platform.
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impact of soil moisture atmosphere interactions on Surface Temperature Distribution
Journal of Climate, 2014Co-Authors: Alexis Berg, Benjamin R Lintner, Kirsten L Findell, Sergey Malyshev, Paul C Loikith, Pierre GentineAbstract:AbstractUnderstanding how different physical processes can shape the probability Distribution function (PDF) of Surface Temperature, in particular the tails of the Distribution, is essential for the attribution and projection of future extreme Temperature events. In this study, the contribution of soil moisture–atmosphere interactions to Surface Temperature PDFs is investigated. Soil moisture represents a key variable in the coupling of the land and atmosphere, since it controls the partitioning of available energy between sensible and latent heat flux at the Surface. Consequently, soil moisture variability driven by the atmosphere may feed back onto the near-Surface climate—in particular, Temperature. In this study, two simulations of the current-generation Geophysical Fluid Dynamics Laboratory (GFDL) Earth System Model, with and without interactive soil moisture, are analyzed in order to assess how soil moisture dynamics impact the simulated climate. Comparison of these simulations shows that soil moist...
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Impact of Soil Moisture–Atmosphere Interactions on Surface Temperature Distribution
Journal of Climate, 2014Co-Authors: Alexis Berg, Benjamin R Lintner, Kirsten L Findell, Sergey Malyshev, Paul C Loikith, Pierre GentineAbstract:AbstractUnderstanding how different physical processes can shape the probability Distribution function (PDF) of Surface Temperature, in particular the tails of the Distribution, is essential for the attribution and projection of future extreme Temperature events. In this study, the contribution of soil moisture–atmosphere interactions to Surface Temperature PDFs is investigated. Soil moisture represents a key variable in the coupling of the land and atmosphere, since it controls the partitioning of available energy between sensible and latent heat flux at the Surface. Consequently, soil moisture variability driven by the atmosphere may feed back onto the near-Surface climate—in particular, Temperature. In this study, two simulations of the current-generation Geophysical Fluid Dynamics Laboratory (GFDL) Earth System Model, with and without interactive soil moisture, are analyzed in order to assess how soil moisture dynamics impact the simulated climate. Comparison of these simulations shows that soil moist...
