High-purity SiO_(2)nanoparticles(SNPs)play a crucial role in various electronic applications,such as semiconductors,solar cells,optical fibers,lenses,and insulating layers,given their purity and particle size,which si...High-purity SiO_(2)nanoparticles(SNPs)play a crucial role in various electronic applications,such as semiconductors,solar cells,optical fibers,lenses,and insulating layers,given their purity and particle size,which significantly impact device efficiency.This study fo-cuses on the synthesis and characterization of pure SNPs through the chemical etching of greater club rush.White powder SNPs were pre-pared using HCl etching,and their thermal behaviors were analyzed via thermogravimetric analysis/differential scanning calorimetry.Structural properties were investigated using X-ray fluorescence,scanning electron microscopy,and transmission electron microscopy.X-ray absorption near-edge structure was employed to assess the oxidation state of the SNPs.The morphology of the SNPs after the first etching was amorphous,with sizes ranging from 50 to 100 nm,which increased to 50-200 nm after the second etching.Despite this size variation,the SNPs maintained a high purity level of 99.8wt%SiO_(2),comparable with industry standards.Notably,the second etching with 0.1-M HCl significantly enhanced the purity level,achieving 99.8wt%SiO_(2)mass.Furthermore,HCl etching facilitated the formation of SiO_(2)in the Si^(4+)oxidation state,akin to industrial SNPs.These findings underscore the critical role of HCl etching in synthesizing high-purity SNPs,with potential applications in advanced electronic devices.展开更多
Zibo is a city with a long history and rich culture.Its unique geographical location and cultural environment have created favorable conditions for its development.In 2023,the barbecue culture in Zibo became popular n...Zibo is a city with a long history and rich culture.Its unique geographical location and cultural environment have created favorable conditions for its development.In 2023,the barbecue culture in Zibo became popular nationwide.The reason for this situation is not only due to the special geographical location and traditional culture of Zibo but also due to many human factors that contributed to this prosperity,allowing Zibo’s economy to take off in 2023.This article will explore the reasons why Zibo barbecue is so popular from several aspects,such as the unique barbecue culture in Zibo,the cooperation and promotion between the government and enterprises,the kindness and hospitality with Shandong people,and the promotion by the media and the internet.展开更多
目的了解年轻男男性行为者(young men who have sex with men,YMSM)rush poppers(以下简称rush)使用现状,分析影响因素。方法 2016年9月—2019年9月,用"滚雪球"抽样法,在绵阳市进行YMSM rush使用和血清学的现况调查,用χ^(2)...目的了解年轻男男性行为者(young men who have sex with men,YMSM)rush poppers(以下简称rush)使用现状,分析影响因素。方法 2016年9月—2019年9月,用"滚雪球"抽样法,在绵阳市进行YMSM rush使用和血清学的现况调查,用χ^(2)检验,logistics回归分析rush使用的影响因素。结果 336名YMSM的rush使用率24.1%,使用时间中位数为4.5(2.0,12.0)个月,42.0%因好奇、29.6%因减少肛交疼痛、27.2%因寻求刺激使用,81.5%与固定性伴、28.4%与偶遇性伴共用,使用后30.8%发生无保护肛交。rush使用的HIV-1阳性率12.3%,高于未使用的2.0%(χ^(2)=15.544,P<0.001)。多因素分析发现,职业非学生(OR=1.992,95%CI:1.036~3.831)、知晓艾滋病知识(OR=2.617,95%CI:1.235~5.545)、有风险认识(OR=4.407,95%CI:1.220~15.918)、近6个月有商业性行为(OR=9.136,95%CI:1.228~67.985)、近6个月肛交人数增加(OR=1.732,95%CI:1.170~2.563)的rush使用可能更大,近1年接受宣传材料发放(OR=0.410,95%CI:0.203~0.825)、近1次肛交有保护(OR=0.346,95%CI:0.152~0.785)的rush使用可能更小。结论 YMSM其rush使用较普遍,好奇是主要原因,与固定性伴共用常见。rush使用增加其高危性行为和HIV感染风险,应针对性加强健康教育。展开更多
目的分析宁波市男男同性性行为人群(men who have sex with men,MSM)使用rush poppers和人类免疫缺陷病毒(human immunodeficiency virus,HIV)感染情况及其相关因素。方法以2019年5月—2020年5月宁波市参加艾滋病咨询检测服务的929名MS...目的分析宁波市男男同性性行为人群(men who have sex with men,MSM)使用rush poppers和人类免疫缺陷病毒(human immunodeficiency virus,HIV)感染情况及其相关因素。方法以2019年5月—2020年5月宁波市参加艾滋病咨询检测服务的929名MSM为研究对象,调查其rush poppers使用情况,并检测其HIV感染状况。比较不同特征及不同性行为MSM rush poppers使用率和HIV抗体阳性率差异,分析MSM rush poppers使用和HIV感染的影响因素。结果宁波市MSM rush poppers的使用与文化程度(χ^(2)=8.49,P=0.01)、户籍地(χ^(2)=18.04,P<0.01)、本地居住时间(χ^(2)=10.27,P=0.02)、性取向(χ^(2)=9.93,P=0.02)、群交行为(χ^(2)=9.59,P=0.01)等有相关性。大专和本科(OR=2.15,95%CI:1.31~3.54)、外省户籍(OR=2.27,95%CI:1.41~3.65)、6个月内经常有群交行为(OR=3.62,95%CI:1.24~10.58)、6个月内未做过HIV检测者(OR=1.66,95%CI:1.07~2.56)是MSM使用rush poppers的影响因素。929名MSM中,rush poppers使用者的HIV抗体阳性率14.15%(15/106)高于未使用者3.28%(27/823),差异有统计学意义(χ^(2)=25.71,P<0.01)。其他民族(OR=5.51,95%CI:1.58~19.15)、6个月内未做过HIV检测(OR=2.09,95%CI:1.08~4.05)、6个月内肛交时未坚持使用安全套(OR=2.31,95%CI:1.21~4.43)是MSM感染HIV的影响因素。结论宁波市MSM rush poppers使用率与同等水平城市相比较高,而rush poppers使用会增加HIV感染在该人群中的传播速度,应重点关注宁波市外省户籍的高学历和高收入流动人口的防控工作。展开更多
目的了解四川省男男性行为人群(men who have sex with men,MSM)rush poppers使用现状及影响因素。方法采用方便抽样的方法在四川省德阳、宜宾和西昌3个城市招募调查对象,对MSM进行自填式匿名问卷调查。采用非条件logistic回归模型对MS...目的了解四川省男男性行为人群(men who have sex with men,MSM)rush poppers使用现状及影响因素。方法采用方便抽样的方法在四川省德阳、宜宾和西昌3个城市招募调查对象,对MSM进行自填式匿名问卷调查。采用非条件logistic回归模型对MSM使用rush poppers进行影响因素分析。结果本研究共招募合格调查对象1122例。调查对象以25岁以上、未婚、四川户籍、高中及以下文化程度、服务/个体或其他职业及收入在3000元以上者为主。27.7%的调查对象报告曾使用过新型毒品,rush poppers为MSM最常使用的新型毒品(24.1%)。logistic回归分析显示,性角色为被插入方(OR=2.488,95%CI:1.587~3.901)或双重性角色(OR=2.233,95%CI:1.494~3.340)、初次性行为年龄<18岁(OR=1.424,95%CI:1.025~1.978)、近1年饮酒(OR=2.347,95%CI:1.473~3.740)及群交性行为(OR=1.681,95%CI:1.113~2.539)是MSM使用rush poppers的影响因素。结论四川省MSM rush poppers使用比例较高,且rush poppers使用与群交性行为等HIV高危因素叠加,将进一步增加MSM感染和传播HIV的风险。因此,应根据使用人群的社会人口学及行为特征制定针对性的干预策略,从而降低该人群感染和传播艾滋病的风险。展开更多
基金supported by the Suranaree University of Technology(SUT)Center of Excellence(CoE)on Advanced Functional Materials(AFM),School of Physics,Suranaree University of Technology,Nakhon Ratchasima,Thailand,the External Grants and Scholarships for Graduate Students,Suranaree University of Technology,Nakhon Ratchasima,Thailand,and the Research Network on Nanotechnology(RNN),Suranaree University of Technology,Nakhon Ratchasima,Thailand.
文摘High-purity SiO_(2)nanoparticles(SNPs)play a crucial role in various electronic applications,such as semiconductors,solar cells,optical fibers,lenses,and insulating layers,given their purity and particle size,which significantly impact device efficiency.This study fo-cuses on the synthesis and characterization of pure SNPs through the chemical etching of greater club rush.White powder SNPs were pre-pared using HCl etching,and their thermal behaviors were analyzed via thermogravimetric analysis/differential scanning calorimetry.Structural properties were investigated using X-ray fluorescence,scanning electron microscopy,and transmission electron microscopy.X-ray absorption near-edge structure was employed to assess the oxidation state of the SNPs.The morphology of the SNPs after the first etching was amorphous,with sizes ranging from 50 to 100 nm,which increased to 50-200 nm after the second etching.Despite this size variation,the SNPs maintained a high purity level of 99.8wt%SiO_(2),comparable with industry standards.Notably,the second etching with 0.1-M HCl significantly enhanced the purity level,achieving 99.8wt%SiO_(2)mass.Furthermore,HCl etching facilitated the formation of SiO_(2)in the Si^(4+)oxidation state,akin to industrial SNPs.These findings underscore the critical role of HCl etching in synthesizing high-purity SNPs,with potential applications in advanced electronic devices.
基金2023 Hebei Province Social Science Development Research Project(Project No.20230203011)。
文摘Zibo is a city with a long history and rich culture.Its unique geographical location and cultural environment have created favorable conditions for its development.In 2023,the barbecue culture in Zibo became popular nationwide.The reason for this situation is not only due to the special geographical location and traditional culture of Zibo but also due to many human factors that contributed to this prosperity,allowing Zibo’s economy to take off in 2023.This article will explore the reasons why Zibo barbecue is so popular from several aspects,such as the unique barbecue culture in Zibo,the cooperation and promotion between the government and enterprises,the kindness and hospitality with Shandong people,and the promotion by the media and the internet.
文摘目的了解年轻男男性行为者(young men who have sex with men,YMSM)rush poppers(以下简称rush)使用现状,分析影响因素。方法 2016年9月—2019年9月,用"滚雪球"抽样法,在绵阳市进行YMSM rush使用和血清学的现况调查,用χ^(2)检验,logistics回归分析rush使用的影响因素。结果 336名YMSM的rush使用率24.1%,使用时间中位数为4.5(2.0,12.0)个月,42.0%因好奇、29.6%因减少肛交疼痛、27.2%因寻求刺激使用,81.5%与固定性伴、28.4%与偶遇性伴共用,使用后30.8%发生无保护肛交。rush使用的HIV-1阳性率12.3%,高于未使用的2.0%(χ^(2)=15.544,P<0.001)。多因素分析发现,职业非学生(OR=1.992,95%CI:1.036~3.831)、知晓艾滋病知识(OR=2.617,95%CI:1.235~5.545)、有风险认识(OR=4.407,95%CI:1.220~15.918)、近6个月有商业性行为(OR=9.136,95%CI:1.228~67.985)、近6个月肛交人数增加(OR=1.732,95%CI:1.170~2.563)的rush使用可能更大,近1年接受宣传材料发放(OR=0.410,95%CI:0.203~0.825)、近1次肛交有保护(OR=0.346,95%CI:0.152~0.785)的rush使用可能更小。结论 YMSM其rush使用较普遍,好奇是主要原因,与固定性伴共用常见。rush使用增加其高危性行为和HIV感染风险,应针对性加强健康教育。
文摘目的了解四川省男男性行为人群(men who have sex with men,MSM)rush poppers使用现状及影响因素。方法采用方便抽样的方法在四川省德阳、宜宾和西昌3个城市招募调查对象,对MSM进行自填式匿名问卷调查。采用非条件logistic回归模型对MSM使用rush poppers进行影响因素分析。结果本研究共招募合格调查对象1122例。调查对象以25岁以上、未婚、四川户籍、高中及以下文化程度、服务/个体或其他职业及收入在3000元以上者为主。27.7%的调查对象报告曾使用过新型毒品,rush poppers为MSM最常使用的新型毒品(24.1%)。logistic回归分析显示,性角色为被插入方(OR=2.488,95%CI:1.587~3.901)或双重性角色(OR=2.233,95%CI:1.494~3.340)、初次性行为年龄<18岁(OR=1.424,95%CI:1.025~1.978)、近1年饮酒(OR=2.347,95%CI:1.473~3.740)及群交性行为(OR=1.681,95%CI:1.113~2.539)是MSM使用rush poppers的影响因素。结论四川省MSM rush poppers使用比例较高,且rush poppers使用与群交性行为等HIV高危因素叠加,将进一步增加MSM感染和传播HIV的风险。因此,应根据使用人群的社会人口学及行为特征制定针对性的干预策略,从而降低该人群感染和传播艾滋病的风险。
