Soil salinization is an issue of global concern.Despite recent evidence indicates that application of sediments into saline-alkali soil in Yellow River Delta as an additive can increase crop yield,its effects on soil ...Soil salinization is an issue of global concern.Despite recent evidence indicates that application of sediments into saline-alkali soil in Yellow River Delta as an additive can increase crop yield,its effects on soil structure and infiltration remain uncertain.In this study,the comprehensively analyses were conducted on the soil infiltration and microstructure of the soil treated with three sediment application layers(surface layer at 0-15 cm,lower layer at 15-30 cm,and plough layer at 0-30 cm)and four sediment incorporation rates(0,2%,5%and 10%),using soil column simulation experiment.Results indicated that the dredged Yellow River sediments can improve the infiltration capacity of saline-alkali soil;and the infiltration capacity increased with the rising sediment incorporation rate under the given application pattern.Compared with the control,applying dredged Yellow River sediments at 10%rate at lower layer and plough layer significantly facilitated the soil infiltration of the saline-alkali soil.Soil macro-porosity for T2,T5 and T10 was 26%,52%and 158%more than that for the control,respectively.This phenomenon was attributed to the increased soil macro-porosity,due to the improved soil microstructure with the incorporation of sediment into the saline-alkali soil.Moreover,the cumulative infiltration was fitted better with Kostiakov infiltration model than Horton and Philip models.展开更多
Four parameters of chemical bond havebeen used to span a feature space to classifyquasicrystal-forming Al-alloys from thatalloys without quasicrystal formationwith good result. Since the first quasicrystal-formingsyst...Four parameters of chemical bond havebeen used to span a feature space to classifyquasicrystal-forming Al-alloys from thatalloys without quasicrystal formationwith good result. Since the first quasicrystal-formingsystem, Al-Mn system, discovered by She-chtman in 1984[1], a series of quasicrystal-forming binary alloy systems have beenfound. Most of these systems are Al-contain-ing systems. Bancel has indicated thatthere are three factors affecting theformability of quasicrystals [2]: (1) ele-ctrochemical factor (this factor can be展开更多
Taking Heilongjiang Bayi Agricultural University as an example, the discipline service practice was explored from the aspects such as free network resources and tool use, subject navigation, subject librarians, inform...Taking Heilongjiang Bayi Agricultural University as an example, the discipline service practice was explored from the aspects such as free network resources and tool use, subject navigation, subject librarians, information sharing space and information literacy education. The typical cases were provided;the optimization of utilization method of network resources was put forward;the subject theme navigation was developed;and the information sharing space of specific discipline and other working strategies were carried out. The experience and enlightenment of active service for subject construction, priority service for key subjects, subject service by lay and step and seizing of the opportunity of subject service were summarized, which developed ideas and provided reference to the establishment of deep subject services of general libraries of colleges and universities.展开更多
A novel approach to extract edge features from wideband echo is proposed. The set of extracted features not only represents the echo waveform in a concise way, but also is sufficient and well suited for classification...A novel approach to extract edge features from wideband echo is proposed. The set of extracted features not only represents the echo waveform in a concise way, but also is sufficient and well suited for classification of non-stationary echo data from objects with different property.The feature extraction is derived from the Discrete Dyadic Wavlet Transform (DDWT) of the echo through the undecimated algorithm. The motivation we use the DDWT is that it is time-shift-invariant which is beneficial for localization of edge, and the wavelet coefficients at larger scale represent the main shape feature of echo, i.e. edge, and the noise and modulated high-frequency components are reduced with scale increased. Some experimental results using real data which contain 144 samples from 4 classes of lake bottoms with different sediments are provided. The results show that our approach is a prospective way to represent wideband echo for reliable recognition of nonstationary echo with great variability.展开更多
基金This work was supported by the National Natural Science Foundation of China(Grant No.51574156)the Key Development Program for Research of Shandong Province(Grant No.2018GNC110023)The authors would like to thank the anonymous reviews and editors for their constructive suggestions which greatly improve the quality of this manuscript.
文摘Soil salinization is an issue of global concern.Despite recent evidence indicates that application of sediments into saline-alkali soil in Yellow River Delta as an additive can increase crop yield,its effects on soil structure and infiltration remain uncertain.In this study,the comprehensively analyses were conducted on the soil infiltration and microstructure of the soil treated with three sediment application layers(surface layer at 0-15 cm,lower layer at 15-30 cm,and plough layer at 0-30 cm)and four sediment incorporation rates(0,2%,5%and 10%),using soil column simulation experiment.Results indicated that the dredged Yellow River sediments can improve the infiltration capacity of saline-alkali soil;and the infiltration capacity increased with the rising sediment incorporation rate under the given application pattern.Compared with the control,applying dredged Yellow River sediments at 10%rate at lower layer and plough layer significantly facilitated the soil infiltration of the saline-alkali soil.Soil macro-porosity for T2,T5 and T10 was 26%,52%and 158%more than that for the control,respectively.This phenomenon was attributed to the increased soil macro-porosity,due to the improved soil microstructure with the incorporation of sediment into the saline-alkali soil.Moreover,the cumulative infiltration was fitted better with Kostiakov infiltration model than Horton and Philip models.
文摘Four parameters of chemical bond havebeen used to span a feature space to classifyquasicrystal-forming Al-alloys from thatalloys without quasicrystal formationwith good result. Since the first quasicrystal-formingsystem, Al-Mn system, discovered by She-chtman in 1984[1], a series of quasicrystal-forming binary alloy systems have beenfound. Most of these systems are Al-contain-ing systems. Bancel has indicated thatthere are three factors affecting theformability of quasicrystals [2]: (1) ele-ctrochemical factor (this factor can be
文摘Taking Heilongjiang Bayi Agricultural University as an example, the discipline service practice was explored from the aspects such as free network resources and tool use, subject navigation, subject librarians, information sharing space and information literacy education. The typical cases were provided;the optimization of utilization method of network resources was put forward;the subject theme navigation was developed;and the information sharing space of specific discipline and other working strategies were carried out. The experience and enlightenment of active service for subject construction, priority service for key subjects, subject service by lay and step and seizing of the opportunity of subject service were summarized, which developed ideas and provided reference to the establishment of deep subject services of general libraries of colleges and universities.
文摘A novel approach to extract edge features from wideband echo is proposed. The set of extracted features not only represents the echo waveform in a concise way, but also is sufficient and well suited for classification of non-stationary echo data from objects with different property.The feature extraction is derived from the Discrete Dyadic Wavlet Transform (DDWT) of the echo through the undecimated algorithm. The motivation we use the DDWT is that it is time-shift-invariant which is beneficial for localization of edge, and the wavelet coefficients at larger scale represent the main shape feature of echo, i.e. edge, and the noise and modulated high-frequency components are reduced with scale increased. Some experimental results using real data which contain 144 samples from 4 classes of lake bottoms with different sediments are provided. The results show that our approach is a prospective way to represent wideband echo for reliable recognition of nonstationary echo with great variability.
