以泰花8号为试验材料,分别设置JM1(0.01 mm强化耐厚膜)、JM2(0.01 mm PPC膜)、JM3(0.01 mm PLA膜)、JM4(0.008 mm PLA膜)、JM5(0.006 mm PLA膜)、JM6(0.01 mm PBAT膜)和CK1(普通白膜)、CK2(普通黑膜)、CK3(露地栽培)处理,研究生物降解...以泰花8号为试验材料,分别设置JM1(0.01 mm强化耐厚膜)、JM2(0.01 mm PPC膜)、JM3(0.01 mm PLA膜)、JM4(0.008 mm PLA膜)、JM5(0.006 mm PLA膜)、JM6(0.01 mm PBAT膜)和CK1(普通白膜)、CK2(普通黑膜)、CK3(露地栽培)处理,研究生物降解膜对花生产量以及收获后田间土壤污染的影响。结果表明:花生收获前,JM2、JM4、JM5和JM6膜型自然降解均达4级(70%)以上,而JM1、CK1和CK2在土壤中仍保持完好。CK1、CK2、JM1对花生生育促进和增产效果均最好,JM3和JM2稍次。通过对JM2、JM3、JM6和CK3土壤样品进行全元素检测和热裂解分析,检测结果中重金属元素均处于安全范围内,且JM2、JM3、JM6土壤样品中主要成分均为CO2。展开更多
Spin parity effect on magnetic relaxation by quantum tunneling in the biaxial spin model is studied by taking into account the transverse local stray field. It is shown that the square root time dependence in the even...Spin parity effect on magnetic relaxation by quantum tunneling in the biaxial spin model is studied by taking into account the transverse local stray field. It is shown that the square root time dependence in the even resonance occurs in the presence of a distribution of transverse anisotropic parameters, while the odd resonance always shows exponential relaxation. Magnetic relaxation under a sweeping field is also studied. The variation of the relaxation curve with the increasing distribution width of the local stray field for even resonance is qualitatively different from that of the odd resonance. The theoretical result on even resonance is in agreement with experimental results on Fe8 system, while the prediction for odd resonance awaits the experimental verification.展开更多
Essential difficulties caused by the nonvanishing boundary condition greatly hinder the development of the systematic perturbation theory for dark solitons.Recently a direct perturbation method for dark one-soliton is...Essential difficulties caused by the nonvanishing boundary condition greatly hinder the development of the systematic perturbation theory for dark solitons.Recently a direct perturbation method for dark one-soliton is developed by the authors with rigorous proof of the completeness of squared Jost solutions.In this letter,influence of the self-steepening term is discussed analytically with the method.展开更多
文摘以泰花8号为试验材料,分别设置JM1(0.01 mm强化耐厚膜)、JM2(0.01 mm PPC膜)、JM3(0.01 mm PLA膜)、JM4(0.008 mm PLA膜)、JM5(0.006 mm PLA膜)、JM6(0.01 mm PBAT膜)和CK1(普通白膜)、CK2(普通黑膜)、CK3(露地栽培)处理,研究生物降解膜对花生产量以及收获后田间土壤污染的影响。结果表明:花生收获前,JM2、JM4、JM5和JM6膜型自然降解均达4级(70%)以上,而JM1、CK1和CK2在土壤中仍保持完好。CK1、CK2、JM1对花生生育促进和增产效果均最好,JM3和JM2稍次。通过对JM2、JM3、JM6和CK3土壤样品进行全元素检测和热裂解分析,检测结果中重金属元素均处于安全范围内,且JM2、JM3、JM6土壤样品中主要成分均为CO2。
基金National Natural Science Foundation of China under Grant No.10575045
文摘Spin parity effect on magnetic relaxation by quantum tunneling in the biaxial spin model is studied by taking into account the transverse local stray field. It is shown that the square root time dependence in the even resonance occurs in the presence of a distribution of transverse anisotropic parameters, while the odd resonance always shows exponential relaxation. Magnetic relaxation under a sweeping field is also studied. The variation of the relaxation curve with the increasing distribution width of the local stray field for even resonance is qualitatively different from that of the odd resonance. The theoretical result on even resonance is in agreement with experimental results on Fe8 system, while the prediction for odd resonance awaits the experimental verification.
基金Supported by the National Natural Science Foundation of Chinathe Doctoral Foundation of China。
文摘Essential difficulties caused by the nonvanishing boundary condition greatly hinder the development of the systematic perturbation theory for dark solitons.Recently a direct perturbation method for dark one-soliton is developed by the authors with rigorous proof of the completeness of squared Jost solutions.In this letter,influence of the self-steepening term is discussed analytically with the method.
