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旱耕人为土N_2O排放动力学特征及其影响因素 被引量:3
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作者 白红英 耿增超 张一平 《西北农林科技大学学报(自然科学版)》 CSCD 北大核心 2003年第2期84-88,共5页
以黄土高原南部典型旱耕地—休闲地土壤为对象 ,研究了中等水分条件下 (6 5 %的田间持水量 )土壤 N2 O排放的动力学特征 ,以及土壤深度和氮磷营养因子对 N2 O排放量的影响。结果表明 ,施肥和未施肥处理 ,土壤 N2 O排放累积量随时间 t的... 以黄土高原南部典型旱耕地—休闲地土壤为对象 ,研究了中等水分条件下 (6 5 %的田间持水量 )土壤 N2 O排放的动力学特征 ,以及土壤深度和氮磷营养因子对 N2 O排放量的影响。结果表明 ,施肥和未施肥处理 ,土壤 N2 O排放累积量随时间 t的变化均符合修正的 Elovich方程 y=bln(t) +a。反应初始浓度 (a)和表观反应速率(dy/ dt)大多数随土壤深度增加而递增 ,但 15℃时以 10 cm深处反应初始浓度最大 ;2 5℃时 ,表观反应速率以 15cm深处最高 ,即在中等水分条件下 ,随温度升高 ,试验土壤 10~ 15 cm深处为 N2 O产生的活跃场所。磷素对土壤N2 O的减排效应不仅表现在排放总量上 ,也存在于动力学参数初始浓度和表观反应速率之中。 展开更多
关键词 氧化二氮 排放动力学 农田生态系统 耕层土壤 旱耕人为土壤 影响因素 反应初始浓度 表观反应速率
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An analytical model for pyrolysis of a single biomass particle 被引量:4
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作者 Mehdi Bidabadi Mohammad Rastegar Moghaddam +2 位作者 Seyed Alireza Mostafavi Farzad Faraji Dizaji Hossein Beidaghy Dizaji 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第1期350-359,共10页
Decreasing in emissions of greenhouse gases to confront the global warming needs to replace fossil fuels as the main doer of the world climate changes by renewable and clean fuels produced from biomass like wood waste... Decreasing in emissions of greenhouse gases to confront the global warming needs to replace fossil fuels as the main doer of the world climate changes by renewable and clean fuels produced from biomass like wood waste which is neutral on the amount of CO2. An analytical and engineering model for pyrolysis process of a single biomass particle has been presented. Using a two-stage semi global kinetic model which includes both primary and secondary reactions, the effects of parameters like shape and size of particle as well as porosity on the particle temperature profile and product yields have been investigated. Comparison of the obtained results with experimental data shows that our results are in a reasonable agreement with previous researchers' works. Finally, a sensitivity analysis is done to determine the importance of each parameter on pyrolysis of a single biomass particle which is affected by many constant parameters. 展开更多
关键词 biomass pyrolysis analytical model single particle sensitivity analysis
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