It is very important to determine the magnetic object location using the magnetic anomaly. This paper presents a method for determined the magnetic object location using the geomagnetic field intensity. The magnetic o...It is very important to determine the magnetic object location using the magnetic anomaly. This paper presents a method for determined the magnetic object location using the geomagnetic field intensity. The magnetic object center position can be obtained by the amplitude of the analytic signal( AS) of geomagnetic total intensity. The vertical distance can be obtained by the value of magnetic anomaly on center position. But the vertical distance from measuring plane to magnetic object is not relatively precious because of not eliminating the geomagnetic normal field in the calculation process. The method of modeling geomagnetic normal field in small space is proposed based on Taylor polynomial. The impact of geomagnetic variation field for the precious of model is analyzed. Through the measured data and the model data,total intensity magnetic anomaly on the measuring plane is obtained which is used for calculating the vertical distance of magnetic object by calculating model. The experimental tests have been conducted on open field on the campus of Harbin Engineering University. The results show that the calculated results and real values match perfectly using this method.展开更多
为应对气候变暖和极端天气频率增加,定向设计和优化北方农牧交错带区域农业生产的种植模式,本研究基于河北省张北县4种作物11种轮作模式的长期定位试验数据,运用调参验证后的APSIM模型(Agricultural production systems simulator),模...为应对气候变暖和极端天气频率增加,定向设计和优化北方农牧交错带区域农业生产的种植模式,本研究基于河北省张北县4种作物11种轮作模式的长期定位试验数据,运用调参验证后的APSIM模型(Agricultural production systems simulator),模拟该地区8种气候情景(3种温度升高、3种极端降水、2种温度升高和极端降水耦合)下228种轮作模式的产量,通过生命周期评价法、碳足迹评价法和投入产出法对比分析不同轮作模式的产能-生态-经济效益。结果表明:温度升高降低了228种轮作模式的平均10年总能量当量产量、平均10年总综合收益和平均土壤固碳量,分别减产9.85%~38.02%、减收13.61%~54.99%、降低26.25%~85.08%。相反,温度升高增加了228种轮作模式的平均10年总净碳排放量,增排51.19%~165.89%。在温度升高耦合极端降水情景下,蚕豆-燕麦轮作模式10年总能量当量产量最高,马铃薯-蚕豆轮作模式10年总净碳排放量最低,蚕豆-马铃薯轮作模式10年总综合收益最高。随着极端降水强度的增加,228种轮作模式的增产、增收和减排能力都有所下降。本研究结果为北方农牧交错带地区制定多目标协同的多样化种植策略提供科学依据,保障气候改变下的粮食安全,促进农业可持续发展。展开更多
基金Sponsored by the National Natural Science Foundation of China(Grant No.61174192)Specialized Research Fund for the Doctoral Program of Higher Education(Grant No.20112304110003)
文摘It is very important to determine the magnetic object location using the magnetic anomaly. This paper presents a method for determined the magnetic object location using the geomagnetic field intensity. The magnetic object center position can be obtained by the amplitude of the analytic signal( AS) of geomagnetic total intensity. The vertical distance can be obtained by the value of magnetic anomaly on center position. But the vertical distance from measuring plane to magnetic object is not relatively precious because of not eliminating the geomagnetic normal field in the calculation process. The method of modeling geomagnetic normal field in small space is proposed based on Taylor polynomial. The impact of geomagnetic variation field for the precious of model is analyzed. Through the measured data and the model data,total intensity magnetic anomaly on the measuring plane is obtained which is used for calculating the vertical distance of magnetic object by calculating model. The experimental tests have been conducted on open field on the campus of Harbin Engineering University. The results show that the calculated results and real values match perfectly using this method.
文摘为应对气候变暖和极端天气频率增加,定向设计和优化北方农牧交错带区域农业生产的种植模式,本研究基于河北省张北县4种作物11种轮作模式的长期定位试验数据,运用调参验证后的APSIM模型(Agricultural production systems simulator),模拟该地区8种气候情景(3种温度升高、3种极端降水、2种温度升高和极端降水耦合)下228种轮作模式的产量,通过生命周期评价法、碳足迹评价法和投入产出法对比分析不同轮作模式的产能-生态-经济效益。结果表明:温度升高降低了228种轮作模式的平均10年总能量当量产量、平均10年总综合收益和平均土壤固碳量,分别减产9.85%~38.02%、减收13.61%~54.99%、降低26.25%~85.08%。相反,温度升高增加了228种轮作模式的平均10年总净碳排放量,增排51.19%~165.89%。在温度升高耦合极端降水情景下,蚕豆-燕麦轮作模式10年总能量当量产量最高,马铃薯-蚕豆轮作模式10年总净碳排放量最低,蚕豆-马铃薯轮作模式10年总综合收益最高。随着极端降水强度的增加,228种轮作模式的增产、增收和减排能力都有所下降。本研究结果为北方农牧交错带地区制定多目标协同的多样化种植策略提供科学依据,保障气候改变下的粮食安全,促进农业可持续发展。
