目的:就体育活动对儿童青少年裸眼远视力、动态视力、眼轴长度(AL)和等效球镜度数(SER)变化的影响进行Meta分析,为今后我国儿童青少年的视力健康和体育活动参与提供理论依据。方法:在中国知网、万方、Web of Science、PubMed等数据库中...目的:就体育活动对儿童青少年裸眼远视力、动态视力、眼轴长度(AL)和等效球镜度数(SER)变化的影响进行Meta分析,为今后我国儿童青少年的视力健康和体育活动参与提供理论依据。方法:在中国知网、万方、Web of Science、PubMed等数据库中,检索有关体育活动影响儿童青少年近视的中英文干预研究。采用Stata15.1和Revman5.4软件对纳入的结局指标进行分析。结果:共纳入26篇文献,其中19篇含随机干预对照实验研究,9篇含前后测实验研究,共9526名儿童青少年。Meta分析结果显示,体育活动能够有效改善儿童青少年动态视力、提高裸眼远视力、延缓AL变化、抑制SER发展。结论:经常参与体育活动能够有效延缓儿童青少年近视的发生和发展,对动态视力、裸眼远视力、AL和SER都有较为显著的作用。今后应纳入广泛的、高质量研究,进一步进行验证。展开更多
When characterizing flows in miniaturized channels, the determination of the dynamic contact angle is important. By measuring the dynamic contact angle, the flow properties of the flowing liquid and the effect of mate...When characterizing flows in miniaturized channels, the determination of the dynamic contact angle is important. By measuring the dynamic contact angle, the flow properties of the flowing liquid and the effect of material properties on the flow can be characterized. A machine vision based system to measure the contact angle of front or rear menisci of a moving liquid plug is described in this article. In this research, transparent flow channels fabricated on thermoplastic polymer and sealed with an adhesive tape are used. The transparency of the channels enables image based monitoring and measurement of flow variables, including the dynamic contact angle. It is shown that the dynamic angle can be measured from a liquid flow in a channel using the image based measurement system. An image processing algorithm has been developed in a MATLAB environment. Images are taken using a CCD camera and the channels are illuminated using a custom made ring light. Two fitting methods, a circle and two parabolas, are experimented and the results are compared in the measurement of the dynamic contact angles.展开更多
文摘目的:就体育活动对儿童青少年裸眼远视力、动态视力、眼轴长度(AL)和等效球镜度数(SER)变化的影响进行Meta分析,为今后我国儿童青少年的视力健康和体育活动参与提供理论依据。方法:在中国知网、万方、Web of Science、PubMed等数据库中,检索有关体育活动影响儿童青少年近视的中英文干预研究。采用Stata15.1和Revman5.4软件对纳入的结局指标进行分析。结果:共纳入26篇文献,其中19篇含随机干预对照实验研究,9篇含前后测实验研究,共9526名儿童青少年。Meta分析结果显示,体育活动能够有效改善儿童青少年动态视力、提高裸眼远视力、延缓AL变化、抑制SER发展。结论:经常参与体育活动能够有效延缓儿童青少年近视的发生和发展,对动态视力、裸眼远视力、AL和SER都有较为显著的作用。今后应纳入广泛的、高质量研究,进一步进行验证。
基金This research was done as part of TEKES-funded PanFlow project and as part of a project OPTIMI funded by the Academy of Finland (grant number 117587) in Micro- and Nanosystems Research Group, Tampere University of Technology, Finland.
文摘When characterizing flows in miniaturized channels, the determination of the dynamic contact angle is important. By measuring the dynamic contact angle, the flow properties of the flowing liquid and the effect of material properties on the flow can be characterized. A machine vision based system to measure the contact angle of front or rear menisci of a moving liquid plug is described in this article. In this research, transparent flow channels fabricated on thermoplastic polymer and sealed with an adhesive tape are used. The transparency of the channels enables image based monitoring and measurement of flow variables, including the dynamic contact angle. It is shown that the dynamic angle can be measured from a liquid flow in a channel using the image based measurement system. An image processing algorithm has been developed in a MATLAB environment. Images are taken using a CCD camera and the channels are illuminated using a custom made ring light. Two fitting methods, a circle and two parabolas, are experimented and the results are compared in the measurement of the dynamic contact angles.
