Pressure-driven reverse osmosis membrane has important application in seawater desalination.Inspired by the structure of aquaporin,we established and studied the mechanism of the structure of multilayer graphene with ...Pressure-driven reverse osmosis membrane has important application in seawater desalination.Inspired by the structure of aquaporin,we established and studied the mechanism of the structure of multilayer graphene with tapered channels as reverse osmosis.The water flux of multilayer graphene with tapered channels was about 20%higher than that of parallel graphene channel.The flow resistance model was established,and the relationship between flow resistance and opening angles was clarified.The relationship between flow resistance and outlet size was also described.By means of molecular dynamics simulation,slip coefficients of multilayer graphene with tapered channel were obtained and verified by the contact angle of water.Results show that the permeability of graphene with tapered channel is about three orders of magnitude higher than that of commercial reverse osmosis membrane and the desalination rate is 100%.Temperature difference between the two sides of the tapered channel will promote the water flux positively.展开更多
目的了解武汉市浴池男男性行为人群(men who have sex with men,MSM)HIV检测情况,分析相关影响因素,为推进艾滋病防控提供科学依据。方法采用自行设计的调查问卷收集MSM的人口学特征、性行为、HIV检测情况、艾滋病知识知晓情况、风险感...目的了解武汉市浴池男男性行为人群(men who have sex with men,MSM)HIV检测情况,分析相关影响因素,为推进艾滋病防控提供科学依据。方法采用自行设计的调查问卷收集MSM的人口学特征、性行为、HIV检测情况、艾滋病知识知晓情况、风险感知情况等,采用非条件多因素logistic回归模型分析MSM近1年接受HIV检测的影响因素。结果725名调查对象中,仅56.55%近1年接受过HIV检测。多因素回归结果显示,本地居住时间>2年(OR=2.320,95%CI:1.502~3.584)、参加过防艾活动(OR=7.859,95%CI:3.656~16.896)、知晓艾滋病知识(OR=4.752,95%CI:2.112~10.692)、信息来源途径的种类≥3种(OR=1.857,95%CI:1.009~3.418)、想过不安全性行为可能感染艾滋病(OR=2.484,95%CI:1.616~3.819)是MSM近1年接受HIV检测的促进因素。估计该市浴池每100名MSM中HIV感染数为3~5名(OR=0.237,95%CI:0.112~0.504)或者1~2名(OR=0.406,95%CI:0.203~0.811)、不清楚是否有朋友感染艾滋病(OR=0.621,95%CI:0.409~0.942)是近1年内接受HIV检测的阻碍因素。结论防艾知识知晓程度高、参加过防艾活动、具有较高艾滋病感染风险意识的MSM更倾向于接受HIV检测,须开展针对性地干预,扩大MSM HIV检测覆盖面,遏制艾滋病在该人群中的流行。展开更多
基金the National Natural Science Foundation of China(No.51706157)Applied Basic Research Foundation of Guangdong Hong Kong-Macao Greater Bay Area(No.2020B1515120011)。
文摘Pressure-driven reverse osmosis membrane has important application in seawater desalination.Inspired by the structure of aquaporin,we established and studied the mechanism of the structure of multilayer graphene with tapered channels as reverse osmosis.The water flux of multilayer graphene with tapered channels was about 20%higher than that of parallel graphene channel.The flow resistance model was established,and the relationship between flow resistance and opening angles was clarified.The relationship between flow resistance and outlet size was also described.By means of molecular dynamics simulation,slip coefficients of multilayer graphene with tapered channel were obtained and verified by the contact angle of water.Results show that the permeability of graphene with tapered channel is about three orders of magnitude higher than that of commercial reverse osmosis membrane and the desalination rate is 100%.Temperature difference between the two sides of the tapered channel will promote the water flux positively.
文摘目的了解武汉市浴池男男性行为人群(men who have sex with men,MSM)HIV检测情况,分析相关影响因素,为推进艾滋病防控提供科学依据。方法采用自行设计的调查问卷收集MSM的人口学特征、性行为、HIV检测情况、艾滋病知识知晓情况、风险感知情况等,采用非条件多因素logistic回归模型分析MSM近1年接受HIV检测的影响因素。结果725名调查对象中,仅56.55%近1年接受过HIV检测。多因素回归结果显示,本地居住时间>2年(OR=2.320,95%CI:1.502~3.584)、参加过防艾活动(OR=7.859,95%CI:3.656~16.896)、知晓艾滋病知识(OR=4.752,95%CI:2.112~10.692)、信息来源途径的种类≥3种(OR=1.857,95%CI:1.009~3.418)、想过不安全性行为可能感染艾滋病(OR=2.484,95%CI:1.616~3.819)是MSM近1年接受HIV检测的促进因素。估计该市浴池每100名MSM中HIV感染数为3~5名(OR=0.237,95%CI:0.112~0.504)或者1~2名(OR=0.406,95%CI:0.203~0.811)、不清楚是否有朋友感染艾滋病(OR=0.621,95%CI:0.409~0.942)是近1年内接受HIV检测的阻碍因素。结论防艾知识知晓程度高、参加过防艾活动、具有较高艾滋病感染风险意识的MSM更倾向于接受HIV检测,须开展针对性地干预,扩大MSM HIV检测覆盖面,遏制艾滋病在该人群中的流行。
