土体微观结构是土体宏观力学机制的反映,深入研究土体微观结构对正确评价土体工程性质具有重要的指导意义.针对松散砂性土的微观结构量化研究中存在的难题,提出了一整套样品制备方法和试验方法,基于数字图像处理技术,对土样的扫描电子...土体微观结构是土体宏观力学机制的反映,深入研究土体微观结构对正确评价土体工程性质具有重要的指导意义.针对松散砂性土的微观结构量化研究中存在的难题,提出了一整套样品制备方法和试验方法,基于数字图像处理技术,对土样的扫描电子显微镜图像(scanning electron microscope,SEM)进行了定量分析,并通过自主开发的程序实现了土样微观结构量化指标的快速获取和全自动处理.采用该方法能对松散的砂性土制备出符合扫描电镜观测要求并同时保持原始结构不受扰动的试样,开发的程序能对土样的SEM图像进行去除多余信息、二值化、去噪、参数统计等预处理步骤,快速获取颗粒个数、面积、形态比、表观孔隙率、分形维数等微观结构量化指标.借助统计学方法,对一些关键量化指标的分布特征进行了分析和探讨.研究结果表明,计算机图像处理技术可以高效识别土体的颗粒和孔隙形态,进行土体微观结构参数的精确提取,从而为土体微观结构的定量分析提供了有效的途径.展开更多
Propagation of electromagnetic wave (EW) through multilayer structure consisting anisotropic layers with gradient refractive index material is studied theoretically. Analytical solution for linear dependence of refrac...Propagation of electromagnetic wave (EW) through multilayer structure consisting anisotropic layers with gradient refractive index material is studied theoretically. Analytical solution for linear dependence of refractive index profile is examined. The structure consist the forbidden gaps, which are sensitive to parameters of refractive index profile.展开更多
Introduction:Vaccination remains a topic of widespread public concern.To ensure that professionals could deliver accurate information to the public directly and efficiently,Suzhou established a dedicated immunization ...Introduction:Vaccination remains a topic of widespread public concern.To ensure that professionals could deliver accurate information to the public directly and efficiently,Suzhou established a dedicated immunization program consultation hotline in 2018.To date,comprehensive,long-term standardized statistical analyses of immunization consultation hotlines in China remain scarce.This study analyzes temporal trends,category characteristics,and shifts in core public concerns regarding immunization consultations in Suzhou from 2018 to 2024,offering evidence to support the optimization of local public health service allocation.Methods:Dedicated professionals answered all calls in real time within a designated room(operating hours:9:00-17:00),and the full content of each call was recorded.Natural language processing(NLP)was applied for text preprocessing,categorical feature definition,frequency counting,and systematic analysis using Microsoft Excel.Descriptive statistics were performed and figures were generated using Python 3.12.1.Results:A total of 76,154 valid records were collected.Annual call volume peaked at 15,365 in 2021 before declining by 80%to 3,025 in 2024.Monthly call volumes were highest between May and September and lowest in January and February.The most common consultation category was assessment form-related inquiries(24,911;32.71%),followed by vaccination services(15,387;20.21%)and vaccination policies(15,026;19.73%).The most frequently consulted vaccines were the human papillomavirus vaccine(HPV)and the rabies vaccine(RV).Conclusions:The hotline served as a direct communication channel between the public and government,accurately reflecting dynamic shifts in public immunization demands while providing actionable support for immunization program.The evolving pattern of public vaccination concerns demonstrates measurable improvements in the quality and efficiency of immunization program in Suzhou.展开更多
文摘土体微观结构是土体宏观力学机制的反映,深入研究土体微观结构对正确评价土体工程性质具有重要的指导意义.针对松散砂性土的微观结构量化研究中存在的难题,提出了一整套样品制备方法和试验方法,基于数字图像处理技术,对土样的扫描电子显微镜图像(scanning electron microscope,SEM)进行了定量分析,并通过自主开发的程序实现了土样微观结构量化指标的快速获取和全自动处理.采用该方法能对松散的砂性土制备出符合扫描电镜观测要求并同时保持原始结构不受扰动的试样,开发的程序能对土样的SEM图像进行去除多余信息、二值化、去噪、参数统计等预处理步骤,快速获取颗粒个数、面积、形态比、表观孔隙率、分形维数等微观结构量化指标.借助统计学方法,对一些关键量化指标的分布特征进行了分析和探讨.研究结果表明,计算机图像处理技术可以高效识别土体的颗粒和孔隙形态,进行土体微观结构参数的精确提取,从而为土体微观结构的定量分析提供了有效的途径.
文摘Propagation of electromagnetic wave (EW) through multilayer structure consisting anisotropic layers with gradient refractive index material is studied theoretically. Analytical solution for linear dependence of refractive index profile is examined. The structure consist the forbidden gaps, which are sensitive to parameters of refractive index profile.
基金Supported by Gusu Health Talents Program:(No.2022127)Suzhou Association for Science and Technology young science and technology personnel lift project(No.127).
文摘Introduction:Vaccination remains a topic of widespread public concern.To ensure that professionals could deliver accurate information to the public directly and efficiently,Suzhou established a dedicated immunization program consultation hotline in 2018.To date,comprehensive,long-term standardized statistical analyses of immunization consultation hotlines in China remain scarce.This study analyzes temporal trends,category characteristics,and shifts in core public concerns regarding immunization consultations in Suzhou from 2018 to 2024,offering evidence to support the optimization of local public health service allocation.Methods:Dedicated professionals answered all calls in real time within a designated room(operating hours:9:00-17:00),and the full content of each call was recorded.Natural language processing(NLP)was applied for text preprocessing,categorical feature definition,frequency counting,and systematic analysis using Microsoft Excel.Descriptive statistics were performed and figures were generated using Python 3.12.1.Results:A total of 76,154 valid records were collected.Annual call volume peaked at 15,365 in 2021 before declining by 80%to 3,025 in 2024.Monthly call volumes were highest between May and September and lowest in January and February.The most common consultation category was assessment form-related inquiries(24,911;32.71%),followed by vaccination services(15,387;20.21%)and vaccination policies(15,026;19.73%).The most frequently consulted vaccines were the human papillomavirus vaccine(HPV)and the rabies vaccine(RV).Conclusions:The hotline served as a direct communication channel between the public and government,accurately reflecting dynamic shifts in public immunization demands while providing actionable support for immunization program.The evolving pattern of public vaccination concerns demonstrates measurable improvements in the quality and efficiency of immunization program in Suzhou.
