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Jianlin Zhang - One of the best experts on this subject based on the ideXlab platform.

  • source apportionment of soil nitrogen and phosphorus based on robust residual kriging and auxiliary soil type map in jintan county china
    Ecological Indicators, 2020
    Co-Authors: Jianlin Zhang, Yan Wang, Jian Chen, Lanfang Yang, Biao Huang, Yongcun Zhao
    Abstract:

    Abstract Previous studies on the source apportionment of soil total nitrogen (TN) and total phosphorus (TP) mainly focused on specific spatial point sites and the closely related information such as soil-type map was seldom used. Moreover, traditional geostatistical models are usually sensitive to outliers. To address these problems, this study first proposed robust residual kriging (RRK) with soil-type data as auxiliary information to increase the spatial prediction accuracies for TN and TP in topsoil (0–20 cm) in Jintan County, China. Then, the spatial distribution patterns of the background concentRations of soil TN and TP were quantitatively assessed based on profile samples (80–100 cm) and the soil-type map. Last, the spatial distribution patterns of exogenous net inputs of TN and TP in topsoil and the corresponding Contribution Ratios were further calculated. Model comparisons showed that the relative improvement (RI) accuracies of RRK and residual kriging (RK) over the traditionally-used ordinary kriging (OK) were 23.91% and 15.22% for soil TN and 24.14% and 20.69% for soil TP, respectively. The results of the source apportionment indicated that (i) the exogenous net inputs of TN and TP had similar spatial distribution patterns, with the low inputs mainly in the west and high inputs mainly in the northeast and east of the county; (ii) high Contribution Ratio of exogenous net input of TN (≥67%) in topsoil was mainly located in the north, southeast, and middle of the study area, and the area with the Contribution Ratio over 70% is 294.16 km2, covering 30.16% of the area of the county; (iii) high Contribution Ratio of exogenous net input of TP (≥53%) in topsoil was mainly located in the north, northeast, and southeast of the county, and the area with Contribution Ratio over 70% is 24.35 km2, covering 2.50% of the area of the county. These results provided more accurate spatial decision support for effectively regulating TN and TP in topsoil.

Yongcun Zhao - One of the best experts on this subject based on the ideXlab platform.

  • source apportionment of soil nitrogen and phosphorus based on robust residual kriging and auxiliary soil type map in jintan county china
    Ecological Indicators, 2020
    Co-Authors: Jianlin Zhang, Yan Wang, Jian Chen, Lanfang Yang, Biao Huang, Yongcun Zhao
    Abstract:

    Abstract Previous studies on the source apportionment of soil total nitrogen (TN) and total phosphorus (TP) mainly focused on specific spatial point sites and the closely related information such as soil-type map was seldom used. Moreover, traditional geostatistical models are usually sensitive to outliers. To address these problems, this study first proposed robust residual kriging (RRK) with soil-type data as auxiliary information to increase the spatial prediction accuracies for TN and TP in topsoil (0–20 cm) in Jintan County, China. Then, the spatial distribution patterns of the background concentRations of soil TN and TP were quantitatively assessed based on profile samples (80–100 cm) and the soil-type map. Last, the spatial distribution patterns of exogenous net inputs of TN and TP in topsoil and the corresponding Contribution Ratios were further calculated. Model comparisons showed that the relative improvement (RI) accuracies of RRK and residual kriging (RK) over the traditionally-used ordinary kriging (OK) were 23.91% and 15.22% for soil TN and 24.14% and 20.69% for soil TP, respectively. The results of the source apportionment indicated that (i) the exogenous net inputs of TN and TP had similar spatial distribution patterns, with the low inputs mainly in the west and high inputs mainly in the northeast and east of the county; (ii) high Contribution Ratio of exogenous net input of TN (≥67%) in topsoil was mainly located in the north, southeast, and middle of the study area, and the area with the Contribution Ratio over 70% is 294.16 km2, covering 30.16% of the area of the county; (iii) high Contribution Ratio of exogenous net input of TP (≥53%) in topsoil was mainly located in the north, northeast, and southeast of the county, and the area with Contribution Ratio over 70% is 24.35 km2, covering 2.50% of the area of the county. These results provided more accurate spatial decision support for effectively regulating TN and TP in topsoil.

Yan Wang - One of the best experts on this subject based on the ideXlab platform.

  • source apportionment of soil nitrogen and phosphorus based on robust residual kriging and auxiliary soil type map in jintan county china
    Ecological Indicators, 2020
    Co-Authors: Jianlin Zhang, Yan Wang, Jian Chen, Lanfang Yang, Biao Huang, Yongcun Zhao
    Abstract:

    Abstract Previous studies on the source apportionment of soil total nitrogen (TN) and total phosphorus (TP) mainly focused on specific spatial point sites and the closely related information such as soil-type map was seldom used. Moreover, traditional geostatistical models are usually sensitive to outliers. To address these problems, this study first proposed robust residual kriging (RRK) with soil-type data as auxiliary information to increase the spatial prediction accuracies for TN and TP in topsoil (0–20 cm) in Jintan County, China. Then, the spatial distribution patterns of the background concentRations of soil TN and TP were quantitatively assessed based on profile samples (80–100 cm) and the soil-type map. Last, the spatial distribution patterns of exogenous net inputs of TN and TP in topsoil and the corresponding Contribution Ratios were further calculated. Model comparisons showed that the relative improvement (RI) accuracies of RRK and residual kriging (RK) over the traditionally-used ordinary kriging (OK) were 23.91% and 15.22% for soil TN and 24.14% and 20.69% for soil TP, respectively. The results of the source apportionment indicated that (i) the exogenous net inputs of TN and TP had similar spatial distribution patterns, with the low inputs mainly in the west and high inputs mainly in the northeast and east of the county; (ii) high Contribution Ratio of exogenous net input of TN (≥67%) in topsoil was mainly located in the north, southeast, and middle of the study area, and the area with the Contribution Ratio over 70% is 294.16 km2, covering 30.16% of the area of the county; (iii) high Contribution Ratio of exogenous net input of TP (≥53%) in topsoil was mainly located in the north, northeast, and southeast of the county, and the area with Contribution Ratio over 70% is 24.35 km2, covering 2.50% of the area of the county. These results provided more accurate spatial decision support for effectively regulating TN and TP in topsoil.

Shinsuke Kato - One of the best experts on this subject based on the ideXlab platform.

  • optimum design for indoor humidity by coupling genetic algorithm with transient simulation based on Contribution Ratio of indoor humidity and climate analysis
    Energy and Buildings, 2012
    Co-Authors: Hong Huang, Shinsuke Kato
    Abstract:

    Abstract In recent years, the capacity to remove moisture is relatively decreased because houses and office buildings are being built with high airtightness and thermal insulation. It is important to maintain indoor humidity at an appropriate level. This study presents a method for the optimum and reliable design of indoor humidity with moisture-buffering materials. An optimum design system was developed using Genetic Algorithm (GA) and the transient simulation for the indoor humidity environment based on Contribution Ratio of Indoor Humidity (CRI(H)) and Contribution Ratios of Indoor Climate (CRI(C)) analysis. To confirm the availability of the proposed system, a living room with a number of heat and moisture sources was analyzed. As design parameters, the amount and arrangement of moisture-buffering materials were analyzed. Two case studies, including single objective and multi-objective optimization problems, were conducted. The purpose of the single objective optimization problem was to prevent high humidity in the indoor environment. In the multi-objective optimization problem, a reliable indoor humidity environment was achieved, and the initial cost of the materials was also used as an objective function. The Pareto-optimal solution sets were analyzed, and the method was proven to be useful for the optimization of indoor humidity.

  • Control of indoor thermal environment based on concept of Contribution Ratio of indoor climate
    Building Simulation, 2010
    Co-Authors: Taro Sasamoto, Shinsuke Kato, Weirong Zhang
    Abstract:

    The Contribution Ratio of indoor climate (CRI) derived from computational fluid dynamics (CFD) was developed to estimate the individual Contribution of heat factors to any location inside a room. The CRI index indicates the structure of the temperature field and allows the CFD results to be applied to analysis and design, with more efficient application. In this study, the concept and calculation method for CRI is introduced first. As an example of the application of CRI, a method for predicting temperatures at any point in a room with a small number of temperature sensors based on CRI is developed. The accuracy of the method is examined by comparing the prediction with a coupled simulation of CFD and radiation.

  • CALCULATION METHOD OF Contribution Ratio OF INDOOR CLIMATE (CRI) BY MEANS OF SETTING A UNIFORM HEAT SINK IN NATURAL CONVECTION AIR FLOW FIELD
    Journal of Environmental Engineering (Transactions of AIJ), 2010
    Co-Authors: Weirong Zhang, Shinsuke Kato, Yoshihiro Ishida, Kyosuke Hiyama, Toshiaki Omori
    Abstract:

    The Contribution Ratio of indoor climate (CRI) based on CFD was developed to estimate the individual Contribution of heat factors to any location inside a room. With the index of CRI, a more precise building energy simulation or real-time systematic control can be expected, within the defined accuracy by means of CFD but with a much reduced calculation load. However most of the studies related to CRI involve forced convection airflow fields. Thus the purpose of this study is to make the CRI effective also in natural convection air flow fields. In this study, a new calculation method was proposed by means of setting a uniform heat sink, by which the steady calculation of CRI could be achieved. A CFD simulation coupled with convection and radiation has been performed in an atrium without air conditioning or ventilation. With the new method the CRI of the north wall was calculated and its influence to the air temperature at some representative locations was analyzed as an example. In addition the time response of CRI was also discussed in this paper.

  • New Scales for Assessing Contribution Ratio of Pollutant Sources to Indoor Air Quality
    Indoor and Built Environment, 2007
    Co-Authors: Taeyeon Kim, Shinsuke Kato, Shuzo Murakami
    Abstract:

    The aim of this study was to provide effective design and control methods for indoor air quality (IAQ). For this it was important to identify each pollutant source and have an understanding of the room air distribution. To design a good system for IAQ both the pollutant sources as well as the ventilation system must be controlled effectively. In this paper, new scales for IAQ that assess the Contribution of pollutant sources, that we have named the Contribution Ratio of Pollutant Sources (CRPSs), are developed. The Contribution of each pollutant source in a room can be analyzed by evaluating the CRPSs. These new scales assume that the pollutant concentRation due to different sources can be added linearly and the airflow is at steady-state. Using CRPS, the Contribution of each pollutant sources in a model room air-conditioned by a displacement ventilation system could be analyzed. The CRPSs were all calculated using the method of computational fluid dynamics (CFD), which can accurately analyze the distribution of the air velocity, temperature, and pollution in the room. The concept of CRPS was found to be very useful in this study.

Abdulvahap Yigit - One of the best experts on this subject based on the ideXlab platform.

  • investigation of efficient parameters on optimum insulation thickness based on theoretical taguchi combined method
    Environmental Progress, 2017
    Co-Authors: Nurullah Arslanoglu, Abdulvahap Yigit
    Abstract:

    Thermal insulation of buildings is one of the most effective energy conservation methods. However, most of the building walls still have little or no insulation despite Turkish Thermal Insulation Standard in Turkey. Four provinces from different climate zones, obtained by the Turkish Thermal Insulation Standard; Izmir (1st zone), Istanbul (2nd zone), Ankara (3rd zone), and Erzurum (4th zone) were selected for analysis. The aim of this study is to investigate of efficient parameters on optimum insulation thickness (OIT) in terms of the order of importance using theoretical-Taguchi coupled method. The OIT was considered as performance parameter. An L16 (43*22) orthogonal array was chosen as a design plan for the five parameters (wall, insulation, fuel type, heating degree-day (HDD) and lifetime). The results were analyzed using signal-to-noise (S/N) Ratio and analysis of variance method. Furthermore, Contribution Ratios for each parameter on OIT. HDD value is the most effective parameter on the OIT with a Contribution Ratio of 34.53% percentage of the total effect. The second most effective parameter is insulation type with a Contribution Ratio of 30.6%, and the effect of fuel type on the OIT is Contribution Ratio of 24.18% and it is followed by lifetime (8.2%), wall type (0.67%), respectively. Consequently, daily mean temperature of cities is most important parameter on OIT. Insulation and fuel type effect is less than HDD, the impact of fuel type is close the impact of insulation type, and the effect of wall type is less than the other parameters. © 2017 American Institute of Chemical Engineers Environ Prog, 2017

  • Investigation of efficient parameters on optimum insulation thickness based on theoretical‐Taguchi combined method
    Environmental Progress, 2017
    Co-Authors: Nurullah Arslanoglu, Abdulvahap Yigit
    Abstract:

    Thermal insulation of buildings is one of the most effective energy conservation methods. However, most of the building walls still have little or no insulation despite Turkish Thermal Insulation Standard in Turkey. Four provinces from different climate zones, obtained by the Turkish Thermal Insulation Standard; Izmir (1st zone), Istanbul (2nd zone), Ankara (3rd zone), and Erzurum (4th zone) were selected for analysis. The aim of this study is to investigate of efficient parameters on optimum insulation thickness (OIT) in terms of the order of importance using theoretical-Taguchi coupled method. The OIT was considered as performance parameter. An L16 (43*22) orthogonal array was chosen as a design plan for the five parameters (wall, insulation, fuel type, heating degree-day (HDD) and lifetime). The results were analyzed using signal-to-noise (S/N) Ratio and analysis of variance method. Furthermore, Contribution Ratios for each parameter on OIT. HDD value is the most effective parameter on the OIT with a Contribution Ratio of 34.53% percentage of the total effect. The second most effective parameter is insulation type with a Contribution Ratio of 30.6%, and the effect of fuel type on the OIT is Contribution Ratio of 24.18% and it is followed by lifetime (8.2%), wall type (0.67%), respectively. Consequently, daily mean temperature of cities is most important parameter on OIT. Insulation and fuel type effect is less than HDD, the impact of fuel type is close the impact of insulation type, and the effect of wall type is less than the other parameters. © 2017 American Institute of Chemical Engineers Environ Prog, 2017