利用多参数水质监测仪对秋季富营养化池塘中pH、DO等指标进行两昼夜连续性监测,分析了pH,DO的昼夜性变化特征及规律。结果显示:该池塘连续2 d pH平均值分别为7.7,7.8,DO平均值分别为11.2,12.9mg/L,pH和DO呈显著正相关性,相关系数分别为0...利用多参数水质监测仪对秋季富营养化池塘中pH、DO等指标进行两昼夜连续性监测,分析了pH,DO的昼夜性变化特征及规律。结果显示:该池塘连续2 d pH平均值分别为7.7,7.8,DO平均值分别为11.2,12.9mg/L,pH和DO呈显著正相关性,相关系数分别为0.972,0.991,且存在明显的昼夜性变化规律;水温连续2 d分别为15.8℃±1℃,15.6℃±1℃,与pH和DO均呈现显著正相关性;叶绿素a昼夜性变化波动较大,连续2 d平均值分别为40.6,113.9 mg/L,变异系数分别为0.76,0.72;在2016年10月31日至11月2日连续两天的15:00,浮游植物的产氧速率和耗氧速率相等,在23:00到次日09:00左右叶绿素a含量基本保持不变,且该时段的平均值接近全天的均值,认为可以将该时段的均值作为衡量该池塘每日浮游植物数量的基本值;在富营养化池塘里影响pH和DO昼夜性变化的主要因素是水温和叶绿素a。展开更多
The deformation mechanisms of twin-structured metallic materials have attracted great interest.Though previous theoretical predictions have suggested that the repulsive force of the twin boundary(TB)can significantly ...The deformation mechanisms of twin-structured metallic materials have attracted great interest.Though previous theoretical predictions have suggested that the repulsive force of the twin boundary(TB)can significantly affect the deformation of twinstructured metals,it remains unclear whether this prediction applies to experimental conditions.In this paper,the atomic-scaled deformation process of twin-structured Pt nanocrystals was in situ observed using our home-made device in a high-resolution transmission electron microscope.We have shown that the plastic deformation of the twin-structured Pt nanocrystals was governed by full dislocation generation as well as Lomer dislocation(LD)lock formation and destruction.After LD locks were destructed,these full dislocations tended to move towards the surface of the nanocrystals.The findings revealed that due to the ultra-high repulsive force of TB on dislocation,there was no dislocation-TB reaction during the deformation.These findings can enrich our understanding of the dislocation behaviors of twin-structured nanocrystals.展开更多
In order to solve the uncertainty of voice-to-color conversion in which one of the three voice features（loudness, tone, rhythm） is applied to control LED color, a linear conversion solution is proposed. And a chroma...In order to solve the uncertainty of voice-to-color conversion in which one of the three voice features（loudness, tone, rhythm） is applied to control LED color, a linear conversion solution is proposed. And a chromaticity diagram is defined by using hue definition on hue-saturation-lightness（HSL） hue ring and the normalization of CIE xyY which is a color standard defined by International Commission on Illumination（CIE）. The chromaticity diagram shows a linear relation between pitch and color, which is referred to conversions of other physical parameters as well. Based on the solution, red（R）, green（G） and blue（B） LEDs, the driving structure of a conversion circuit is designed and set up. The results indicate that signal processing of tone-to-color conversion is effective, from 30 Hz to 3 kHz with a resolution of 10 Hz mapped to the chromaticity diagram.展开更多
基金the National Key R&D Program of China(Grant No.2017YFB0305501)the Beijing Outstanding Young Scientist Projects(Grant No.BJJWZYJH01201910005018)+3 种基金the National Natural Science Foundation of China(Grant Nos.11722429,51771104,91860202)“111”Project(Grant No.DB18015)the Beijing Natural Science Foundation(Grant No.Z180014)the Fok Ying-Tong Education Foundation of China(Grant No.151006)。
文摘The deformation mechanisms of twin-structured metallic materials have attracted great interest.Though previous theoretical predictions have suggested that the repulsive force of the twin boundary(TB)can significantly affect the deformation of twinstructured metals,it remains unclear whether this prediction applies to experimental conditions.In this paper,the atomic-scaled deformation process of twin-structured Pt nanocrystals was in situ observed using our home-made device in a high-resolution transmission electron microscope.We have shown that the plastic deformation of the twin-structured Pt nanocrystals was governed by full dislocation generation as well as Lomer dislocation(LD)lock formation and destruction.After LD locks were destructed,these full dislocations tended to move towards the surface of the nanocrystals.The findings revealed that due to the ultra-high repulsive force of TB on dislocation,there was no dislocation-TB reaction during the deformation.These findings can enrich our understanding of the dislocation behaviors of twin-structured nanocrystals.
文摘In order to solve the uncertainty of voice-to-color conversion in which one of the three voice features（loudness, tone, rhythm） is applied to control LED color, a linear conversion solution is proposed. And a chromaticity diagram is defined by using hue definition on hue-saturation-lightness（HSL） hue ring and the normalization of CIE xyY which is a color standard defined by International Commission on Illumination（CIE）. The chromaticity diagram shows a linear relation between pitch and color, which is referred to conversions of other physical parameters as well. Based on the solution, red（R）, green（G） and blue（B） LEDs, the driving structure of a conversion circuit is designed and set up. The results indicate that signal processing of tone-to-color conversion is effective, from 30 Hz to 3 kHz with a resolution of 10 Hz mapped to the chromaticity diagram.
