AIM：To evaluate the influence of corneal power on circumpapillary retinal nerve fiber layer（cp RNFL）and optic nerve head（ONH）measurements by spectral-domain optical coherence tomography（SD-OCT）.METHODS：Twenty-...AIM：To evaluate the influence of corneal power on circumpapillary retinal nerve fiber layer（cp RNFL）and optic nerve head（ONH）measurements by spectral-domain optical coherence tomography（SD-OCT）.METHODS：Twenty-five eyes of 25 healthy participants（mean age 23.6±3.6y）were imaged by SD-OCT using horizontal raster scans.Disposable soft contact lenses of different powers（from-11 to＋5 diopters including 0diopter）were worn to induce 2-diopter changes in corneal power.Differences in the cp RNFL and ONH measurements per diopter of change in corneal power were analyzed.RESULTS：As corneal power increased by 1 diopter,total and quadrant cp RNFL thicknesses,except for the nasal sector,decreased by-0.19 to-0.32μm（P〈0.01）.Furthermore,the disc,cup,and rim areas decreased by-0.017,-0.007,and-0.015 mm2,respectively（P〈0.001）;the cup and rim volumes decreased by-0.0013 and-0.006 mm3,respectively（P〈0.01）;and the vertical and horizontal disc diameters decreased by-0.006 and-0.007 mm,respectively（P〈0.001）.CONCLUSION：For more precise OCT imaging,the ocular magnification should be corrected by considering both the axial length and corneal power.However,the effect of corneal power changes on cp RNFL thickness and ONH topography are small when compare with those of the axial length.展开更多
To study the role of autonomic nervous system in the period of developing syncope induced by head-up tilt test(HUT), we analysed the changes of heart rate power spectral density(HRPSD) in 50 patients with unexplained ...To study the role of autonomic nervous system in the period of developing syncope induced by head-up tilt test(HUT), we analysed the changes of heart rate power spectral density(HRPSD) in 50 patients with unexplained syncope, including 15 positive patients (Group 1) and 35 negative patients(Group 2), and 15 negative healthy persons(Group 3) in 5 minute periods before and after tilting and 5 minutes before the end of test. HRPSD and their changes in total(T), very low-frequence(VLF), low-frequence(LF), high-frequence(HF) and the ratio of low/high frequence(LF/HF) were similar (P>0.05) 5 minutes before and after tilting among three groups. Five minutes before the end of test, Group 1 had obvious increase of T, VLF, LF and LF/HF while Group 2 and 3 had not such significant changes. There was significant difference(P<0.01) compared Group 1 with Group 2, 3. The results showed that the abnormal regulatory function of autonomic nervous system played an important role in the mechanism of symcope induced by HUT, the positive group had abnormal increase of sympathetic tone and imbalance of sympathetic/parasympathetic neural tone before syncope appeared.展开更多
超低水头轴流式液力透平模型试验发现,设计工况下转速波动较大,功率输出不稳定。为分析其原因,该研究以DN860超低水头轴流式液力透平为对象,采用ANSYS Fluent2020R2中动网格SDOF(six degree of freedom)求解器,分析负载扭矩、流量和含...超低水头轴流式液力透平模型试验发现,设计工况下转速波动较大,功率输出不稳定。为分析其原因,该研究以DN860超低水头轴流式液力透平为对象,采用ANSYS Fluent2020R2中动网格SDOF(six degree of freedom)求解器,分析负载扭矩、流量和含气率变化对其转速特性的影响。结果表明:液力透平启动时,转速急剧升高后经短时小幅波动再缓慢升高直至稳定,转速稳定后,由于内部沿程摩擦损失,透平模拟转速随扭矩增大非线性减小,且模拟转速均低于理论转速,扭矩越小,二者差值越大。流量无论线性增加还是周期性正弦变化,液力透平的转速变化与流量变化基本一致,呈正相关。含气率对液力透平转速和效率影响较大,当含气率从0增加到30%时,透平的转速和功率系数分别降低16.2%和16.4%。研究结果可为同类型超低水头轴流式液力透平转速特性及其控制研究提供参考。展开更多
在电力系统中,电力线路承载着输送电能的重要任务,安全可靠的电力线路对电力系统的稳定发展有着重要的意义。针对利用深度学习算法对电力线路中的悬挂物、塔吊等目标检测准确率低、实时性差的问题,提出基于改进YOLOv5的电力线路安全检...在电力系统中,电力线路承载着输送电能的重要任务,安全可靠的电力线路对电力系统的稳定发展有着重要的意义。针对利用深度学习算法对电力线路中的悬挂物、塔吊等目标检测准确率低、实时性差的问题,提出基于改进YOLOv5的电力线路安全检测与异常识别方法。该方法基于YOLOv5算法,在网络的部分C3模块中引入ECA注意力机制,增强网络的特征提取能力;在主干网络中的池化层之后增加Fast-RFB模块,提高检测速度与准确性;使用解耦头部替代原始网络的耦合检测头部,提高检测精度;最后将原始模型的CIoU损失函数替换成Wise-IoU损失函数,减少训练过程的损失。仿真实验表明,改进后的YOLOv5算法在电力线路数据集上的P mA 0.5与P mA 0.5:0.95分别为92.2%和56.5%,分别超出了YOLOv5原始模型10.3%和7.3%,检测速度为83帧/s,满足实际环境中对电力线路安全检测与异常识别的要求。展开更多
通过分析当前水务行业“双碳”实施方法,发现尚存在碳排放强度高导致中和难度大等问题。提出“低碳为先、厂内中和、系统筹划、兼顾效益”的碳中和给水厂设计原则,提出打造低碳水厂实现减碳、自发清洁电置换外购电实现换碳、余电上网实...通过分析当前水务行业“双碳”实施方法,发现尚存在碳排放强度高导致中和难度大等问题。提出“低碳为先、厂内中和、系统筹划、兼顾效益”的碳中和给水厂设计原则,提出打造低碳水厂实现减碳、自发清洁电置换外购电实现换碳、余电上网实现抵碳的碳中和实施路径。在大罗水厂试点设计建设碳中和水厂,原水和自来水均设计为重力流输配,利用原水富余水头发电,在厂区布设分布式光伏,所发电自发自用、余电上网。经碳核算,大罗水厂碳排放强度仅为0.009 59 kg CO_(2)/m^(3),碳抵消比例可达到100%以上,且采取的水力发电、光伏发电等碳中和措施可获得较好的经济效益。展开更多
基金Supported by a Research Fund at Kitasato University
文摘AIM：To evaluate the influence of corneal power on circumpapillary retinal nerve fiber layer（cp RNFL）and optic nerve head（ONH）measurements by spectral-domain optical coherence tomography（SD-OCT）.METHODS：Twenty-five eyes of 25 healthy participants（mean age 23.6±3.6y）were imaged by SD-OCT using horizontal raster scans.Disposable soft contact lenses of different powers（from-11 to＋5 diopters including 0diopter）were worn to induce 2-diopter changes in corneal power.Differences in the cp RNFL and ONH measurements per diopter of change in corneal power were analyzed.RESULTS：As corneal power increased by 1 diopter,total and quadrant cp RNFL thicknesses,except for the nasal sector,decreased by-0.19 to-0.32μm（P〈0.01）.Furthermore,the disc,cup,and rim areas decreased by-0.017,-0.007,and-0.015 mm2,respectively（P〈0.001）;the cup and rim volumes decreased by-0.0013 and-0.006 mm3,respectively（P〈0.01）;and the vertical and horizontal disc diameters decreased by-0.006 and-0.007 mm,respectively（P〈0.001）.CONCLUSION：For more precise OCT imaging,the ocular magnification should be corrected by considering both the axial length and corneal power.However,the effect of corneal power changes on cp RNFL thickness and ONH topography are small when compare with those of the axial length.
文摘To study the role of autonomic nervous system in the period of developing syncope induced by head-up tilt test(HUT), we analysed the changes of heart rate power spectral density(HRPSD) in 50 patients with unexplained syncope, including 15 positive patients (Group 1) and 35 negative patients(Group 2), and 15 negative healthy persons(Group 3) in 5 minute periods before and after tilting and 5 minutes before the end of test. HRPSD and their changes in total(T), very low-frequence(VLF), low-frequence(LF), high-frequence(HF) and the ratio of low/high frequence(LF/HF) were similar (P>0.05) 5 minutes before and after tilting among three groups. Five minutes before the end of test, Group 1 had obvious increase of T, VLF, LF and LF/HF while Group 2 and 3 had not such significant changes. There was significant difference(P<0.01) compared Group 1 with Group 2, 3. The results showed that the abnormal regulatory function of autonomic nervous system played an important role in the mechanism of symcope induced by HUT, the positive group had abnormal increase of sympathetic tone and imbalance of sympathetic/parasympathetic neural tone before syncope appeared.
文摘超低水头轴流式液力透平模型试验发现,设计工况下转速波动较大,功率输出不稳定。为分析其原因,该研究以DN860超低水头轴流式液力透平为对象,采用ANSYS Fluent2020R2中动网格SDOF(six degree of freedom)求解器,分析负载扭矩、流量和含气率变化对其转速特性的影响。结果表明:液力透平启动时,转速急剧升高后经短时小幅波动再缓慢升高直至稳定,转速稳定后,由于内部沿程摩擦损失,透平模拟转速随扭矩增大非线性减小,且模拟转速均低于理论转速,扭矩越小,二者差值越大。流量无论线性增加还是周期性正弦变化,液力透平的转速变化与流量变化基本一致,呈正相关。含气率对液力透平转速和效率影响较大,当含气率从0增加到30%时,透平的转速和功率系数分别降低16.2%和16.4%。研究结果可为同类型超低水头轴流式液力透平转速特性及其控制研究提供参考。
文摘在电力系统中,电力线路承载着输送电能的重要任务,安全可靠的电力线路对电力系统的稳定发展有着重要的意义。针对利用深度学习算法对电力线路中的悬挂物、塔吊等目标检测准确率低、实时性差的问题,提出基于改进YOLOv5的电力线路安全检测与异常识别方法。该方法基于YOLOv5算法,在网络的部分C3模块中引入ECA注意力机制,增强网络的特征提取能力;在主干网络中的池化层之后增加Fast-RFB模块,提高检测速度与准确性;使用解耦头部替代原始网络的耦合检测头部,提高检测精度;最后将原始模型的CIoU损失函数替换成Wise-IoU损失函数,减少训练过程的损失。仿真实验表明,改进后的YOLOv5算法在电力线路数据集上的P mA 0.5与P mA 0.5:0.95分别为92.2%和56.5%,分别超出了YOLOv5原始模型10.3%和7.3%,检测速度为83帧/s,满足实际环境中对电力线路安全检测与异常识别的要求。
文摘通过分析当前水务行业“双碳”实施方法,发现尚存在碳排放强度高导致中和难度大等问题。提出“低碳为先、厂内中和、系统筹划、兼顾效益”的碳中和给水厂设计原则,提出打造低碳水厂实现减碳、自发清洁电置换外购电实现换碳、余电上网实现抵碳的碳中和实施路径。在大罗水厂试点设计建设碳中和水厂,原水和自来水均设计为重力流输配,利用原水富余水头发电,在厂区布设分布式光伏,所发电自发自用、余电上网。经碳核算,大罗水厂碳排放强度仅为0.009 59 kg CO_(2)/m^(3),碳抵消比例可达到100%以上,且采取的水力发电、光伏发电等碳中和措施可获得较好的经济效益。
