The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform
Li Feng - One of the best experts on this subject based on the ideXlab platform.
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Effort Research of Nitrogen Content on High Speed Rail Steel Rail Quality U71Mn
Physics Examination and Testing, 2010Co-Authors: Li FengAbstract:Aiming at resolving the issue of higher Nitrogen Content of U71Mn high speed rail steel produced by BaoGang Group,a few of questions were studied here.They include effort on steel quality of Nitrogen Content,distribution of Nitrogen Content and factors affecting Nitrogen Content.The result shows that with the increasing of steel Nitrogen Content,the fracture toughness of rail steel decreased.Finally,Nitrogen Content of steel is effectively controlled by changing asphalt coke to anthracite used as carburant.
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Effect of Nitrogen Content on quality of rail steel U75V for high speed railway
2010Co-Authors: Li FengAbstract:The present paper studies the ratio of vanadium Content and Nitrogen Content in U75V rail steel produced by Iron Steel Corporation of Baotou and used for high speed railway as well as the relationship between fracture toughness of rail steel and Nitrogen Content.Result shows that the fracture toughness of rail steel increases with the rise of the Nitrogen Content,therefore the limit of Nitrogen Content in the rail steel U75V used for high speed railway should be is confined from 65×10-6 to 80×10-6.The result of industrial trial for 3 months demonstrates that routine mechanical property of rail steel remains intact after increase of Nitrogen Content in the steel and hence prominent economical efficiencies have been achieved in the enterprise.
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Relationships between Leaf Nitrogen Content and Canopy Reflected Spectral in Cotton
Xinjiang Agricultural Sciences, 2008Co-Authors: Li FengAbstract:The field spectra reflectance data at key growth stages of cotton were analyzed.It indicated that the spectral reflectance of wave band had significant correlation to leaf Nitrogen Content at 350-732,733-940 nm and 1 970-2 477 nm.The proper spectral reflectance should be established for donating the spectral reflectance and leaf Nitrogen Content at different growth stages.Quantitative relationships of leaf Nitrogen Content and relevant quality traits to canopy reflectance was analyzed.The hyperspectral parameters were investigated in the experiments.The results showed that leaf Nitrogen Content could be predicted by depth 1 154 and PRI(570,530 nm) during flowering and full-blossoming.The quantitative relationships between leaf Nitrogen concentration and depth of absorption valley(VD1154) of canopy were significant different from an average R2 of 0.7473.These results provided a theoretical basis and technical approach for monitoring of plant Nitrogen status and precision management of Nitrogen fertilization in cotton production.
Shuhuai Zhang - One of the best experts on this subject based on the ideXlab platform.
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Estimation and mapping of Nitrogen Content in apple trees at leaf and canopy levels using hyperspectral imaging
Precision Agriculture, 2019Co-Authors: Xujun Ye, Shiori Abe, Shuhuai ZhangAbstract:Accurate and rapid diagnosis of Nitrogen status in fruit trees on an individual tree basis is a prerequisite for precision orchard nutrient management. This study presents a rapid and non-destructive approach for estimation and mapping of Nitrogen Content in apple trees at both leaf and canopy levels. An ImSpector V10 system was used to collect hyperspectral images (400–1000 nm) for both apple leaves and canopies. Nitrogen Content in apple leaves was measured by Vario EL cube. Raw reflectance and first derivative reflectance were used to relate to leaf Nitrogen Content. Partial least squares (PLS) regression and multiple linear regression (MLR) analyses were performed to estimate Nitrogen Content from reflectance. The results showed that both PLS and MLR models achieved reasonable predictive accuracy (PLS and MLR models based on raw reflectance: R^2 = 0.7728 and 0.7843 (p
Masayoshi Watanabe - One of the best experts on this subject based on the ideXlab platform.
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Upper Limit of Nitrogen Content in Carbon Materials
Angewandte Chemie (International ed. in English), 2014Co-Authors: Shiguo Zhang, Seiji Tsuzuki, Kazuhide Ueno, Kaoru Dokko, Masayoshi WatanabeAbstract:Nitrogen-doped carbon materials (NDCs) play an important role in various fields. A great deal of effort has been devoted to obtaining carbon materials with a high Nitrogen Content; however, much is still unknown about the structure of the Nitrogen-doped materials and the maximum Nitrogen Content possible for such compounds. Here, we demonstrate an interesting relationship between the N/C molar ratio and the N Content of NDCs. The upper limit for the Nitrogen Content of NDCs that might be achieved was estimated and found to strongly depend on the carbonization temperature (14.32 wt % at 1000 °C and 21.66 wt % at 900 °C), irrespective of the precursor or preparation conditions. Simulations suggest that, especially in the carbon architectures obtained at high temperatures, Nitrogen atoms are always located on separate hexagon moieties in a graphitic configuration, thereby yielding a critical N/C molar ratio very close to the value estimated from the experimental results.
Xujun Ye - One of the best experts on this subject based on the ideXlab platform.
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Estimation and mapping of Nitrogen Content in apple trees at leaf and canopy levels using hyperspectral imaging
Precision Agriculture, 2019Co-Authors: Xujun Ye, Shiori Abe, Shuhuai ZhangAbstract:Accurate and rapid diagnosis of Nitrogen status in fruit trees on an individual tree basis is a prerequisite for precision orchard nutrient management. This study presents a rapid and non-destructive approach for estimation and mapping of Nitrogen Content in apple trees at both leaf and canopy levels. An ImSpector V10 system was used to collect hyperspectral images (400–1000 nm) for both apple leaves and canopies. Nitrogen Content in apple leaves was measured by Vario EL cube. Raw reflectance and first derivative reflectance were used to relate to leaf Nitrogen Content. Partial least squares (PLS) regression and multiple linear regression (MLR) analyses were performed to estimate Nitrogen Content from reflectance. The results showed that both PLS and MLR models achieved reasonable predictive accuracy (PLS and MLR models based on raw reflectance: R^2 = 0.7728 and 0.7843 (p
Shiguo Zhang - One of the best experts on this subject based on the ideXlab platform.
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Upper Limit of Nitrogen Content in Carbon Materials
Angewandte Chemie (International ed. in English), 2014Co-Authors: Shiguo Zhang, Seiji Tsuzuki, Kazuhide Ueno, Kaoru Dokko, Masayoshi WatanabeAbstract:Nitrogen-doped carbon materials (NDCs) play an important role in various fields. A great deal of effort has been devoted to obtaining carbon materials with a high Nitrogen Content; however, much is still unknown about the structure of the Nitrogen-doped materials and the maximum Nitrogen Content possible for such compounds. Here, we demonstrate an interesting relationship between the N/C molar ratio and the N Content of NDCs. The upper limit for the Nitrogen Content of NDCs that might be achieved was estimated and found to strongly depend on the carbonization temperature (14.32 wt % at 1000 °C and 21.66 wt % at 900 °C), irrespective of the precursor or preparation conditions. Simulations suggest that, especially in the carbon architectures obtained at high temperatures, Nitrogen atoms are always located on separate hexagon moieties in a graphitic configuration, thereby yielding a critical N/C molar ratio very close to the value estimated from the experimental results.
