In this paper, we investigate the growth of solutions of higher order linear differential equations with meromorphic coefficients. Under certain conditions, we obtain precise estimation of growth order and hyper-order...In this paper, we investigate the growth of solutions of higher order linear differential equations with meromorphic coefficients. Under certain conditions, we obtain precise estimation of growth order and hyper-order of solutions of the equation.展开更多
High resolution angle-resolved photoemission measurements are carried out to systematically investigate the effect of cleaving temperature on the electronic structures and Fermi surfaces of Sr2RuO4.Unlike previous rep...High resolution angle-resolved photoemission measurements are carried out to systematically investigate the effect of cleaving temperature on the electronic structures and Fermi surfaces of Sr2RuO4.Unlike previous reports,which found that a high cleaving temperature can suppress the surface Fermi surface,we find that the surface Fermi surface remains obvious and strong in Sr2RuO4 cleaved at high temperature,even at room temperature.This indicates that cleaving temperature is not a key effective factor in suppressing surface bands.On the other hand,the bulk bands can be enhanced in an aged surface of Sr2RuO4 that has been cleaved and held for a long time.We have also carried out laser ARPES measurements on Sr_(2)RuO_(4) by using a vacuum ultra-violet laser (photon energy at 6.994eV) and found an obvious enhancement of bulk bands even for samples cleaved at low temperature.This information is important for realizing an effective approach to manipulating and detecting the surface and bulk electronic structure of Sr2RuO4.In particular,the enhancement of bulk sensitivity,along with the super-high instrumental resolution of VUV laser ARPES,will be advantageous in investigating fine electronic structure and superconducting properties of Sr_(2)RuO_(4) in the future.展开更多
选取典型硫铁矿区周边受Cd和Zn复合污染黄壤为研究对象,采用淋溶试验和老化试验,探索添加羟基磷灰石对土壤中重金属生物有效性以及形态分布的影响,羟基磷灰石添加比例(w/w)设置为0%(CK)、1%(P1)、3%(P3)和5%(P5)。结果表明:(1)添加羟基...选取典型硫铁矿区周边受Cd和Zn复合污染黄壤为研究对象,采用淋溶试验和老化试验,探索添加羟基磷灰石对土壤中重金属生物有效性以及形态分布的影响,羟基磷灰石添加比例(w/w)设置为0%(CK)、1%(P1)、3%(P3)和5%(P5)。结果表明:(1)添加羟基磷灰石能够显著提高淋滤液的pH值,明显降低土壤中Cd和Zn淋失量,P1、P3和P5与CK的Cd累积淋失量(120μg)相比可分别降低74.2%、85.0%、92.0%,与CK的Zn累积淋失量(16.7 mg)相比可分别降低79.4%、92.1%、97.9%;(2)添加羟基磷灰石能够显著提高土壤pH值,P1、P3和P5的pH值分别比CK升高了0.64、0.85、1.20个pH单位;(3)添加羟基磷灰石能够显著降低土壤有效态Cd和Zn(0.025 M HCl提取),相较于CK,P1、P3和P5的有效态Cd含量可分别降低74.2%、96.8%、98.4%,有效态Zn含量可分别降低68.1%、96.6%、99.5%;(4)添加羟基磷灰石能够显著降低土壤可交换态和碳酸盐结合态Cd和Zn含量,增加土壤中残渣态Cd和Zn含量,从而促进Cd和Zn向非活性态转化。本研究证明了羟基磷灰石在西南典型硫铁矿区土壤重金属污染修复中有较大的应用潜力。展开更多
基金Gansu key research and development program-Industrial project,under Grant(No.23YFGA0070)the Higher Education Industrial Support Plan Project of Gansu Province,under Grant(No.2021CYZC-29)兰州市青年基金(2023-QN-185)。
文摘In this paper, we investigate the growth of solutions of higher order linear differential equations with meromorphic coefficients. Under certain conditions, we obtain precise estimation of growth order and hyper-order of solutions of the equation.
基金Support by the National Natural Science Foundation of China under Grant Nos 10734120 and 91021006the National Basic Research Program of China under Grant Nos 2011CB921703 and 2011CB605903.
文摘High resolution angle-resolved photoemission measurements are carried out to systematically investigate the effect of cleaving temperature on the electronic structures and Fermi surfaces of Sr2RuO4.Unlike previous reports,which found that a high cleaving temperature can suppress the surface Fermi surface,we find that the surface Fermi surface remains obvious and strong in Sr2RuO4 cleaved at high temperature,even at room temperature.This indicates that cleaving temperature is not a key effective factor in suppressing surface bands.On the other hand,the bulk bands can be enhanced in an aged surface of Sr2RuO4 that has been cleaved and held for a long time.We have also carried out laser ARPES measurements on Sr_(2)RuO_(4) by using a vacuum ultra-violet laser (photon energy at 6.994eV) and found an obvious enhancement of bulk bands even for samples cleaved at low temperature.This information is important for realizing an effective approach to manipulating and detecting the surface and bulk electronic structure of Sr2RuO4.In particular,the enhancement of bulk sensitivity,along with the super-high instrumental resolution of VUV laser ARPES,will be advantageous in investigating fine electronic structure and superconducting properties of Sr_(2)RuO_(4) in the future.
文摘选取典型硫铁矿区周边受Cd和Zn复合污染黄壤为研究对象,采用淋溶试验和老化试验,探索添加羟基磷灰石对土壤中重金属生物有效性以及形态分布的影响,羟基磷灰石添加比例(w/w)设置为0%(CK)、1%(P1)、3%(P3)和5%(P5)。结果表明:(1)添加羟基磷灰石能够显著提高淋滤液的pH值,明显降低土壤中Cd和Zn淋失量,P1、P3和P5与CK的Cd累积淋失量(120μg)相比可分别降低74.2%、85.0%、92.0%,与CK的Zn累积淋失量(16.7 mg)相比可分别降低79.4%、92.1%、97.9%;(2)添加羟基磷灰石能够显著提高土壤pH值,P1、P3和P5的pH值分别比CK升高了0.64、0.85、1.20个pH单位;(3)添加羟基磷灰石能够显著降低土壤有效态Cd和Zn(0.025 M HCl提取),相较于CK,P1、P3和P5的有效态Cd含量可分别降低74.2%、96.8%、98.4%,有效态Zn含量可分别降低68.1%、96.6%、99.5%;(4)添加羟基磷灰石能够显著降低土壤可交换态和碳酸盐结合态Cd和Zn含量,增加土壤中残渣态Cd和Zn含量,从而促进Cd和Zn向非活性态转化。本研究证明了羟基磷灰石在西南典型硫铁矿区土壤重金属污染修复中有较大的应用潜力。
