设计了一种基于嵌入式Linux的矿用搜救机器人音视频系统。系统选用S5PV210微处理器作为主控单元,采用1/2.7 inch CMOS USB双目摄像头+BH1750光强采集+850 nm红外补光作为低照度环境下视频采集方案、本质安全电压转换方案和有线/无线通...设计了一种基于嵌入式Linux的矿用搜救机器人音视频系统。系统选用S5PV210微处理器作为主控单元,采用1/2.7 inch CMOS USB双目摄像头+BH1750光强采集+850 nm红外补光作为低照度环境下视频采集方案、本质安全电压转换方案和有线/无线通信接口,实现了矿井低照度环境下高清音视频的采集,并对采集的音视频数据进行压缩、存储、显示以及传输。展开更多
To optimize their Al_(2)O_(3)-SiO_(2) raw materials,anorthite based insulation refractories were prepared by the in-situ sintering process combined with the foaming method after sintering at 1350℃for 3 h,using green ...To optimize their Al_(2)O_(3)-SiO_(2) raw materials,anorthite based insulation refractories were prepared by the in-situ sintering process combined with the foaming method after sintering at 1350℃for 3 h,using green and pollution-free kaolin,kyanite,andalusite and sillimanite as Al_(2)O_(3)-SiO_(2) raw materials,respectively,and industrial CaCO_(3) as the CaO source.Effects of Al_(2)O_(3)-SiO_(2) raw material types on the physical properties,phase composition and microstructure were investigated.The results are as follows.All samples prepared by different Al_(2)O_(3)-SiO_(2) raw materials have hexagonal flake anorthite and a small amount of mullite and corundum.Their bulk density and thermal conductivity decrease in the order of using kaolin,andalusite,kyanite and sillimanite as the Al_(2)O_(3)-SiO_(2) raw material,but their apparent porosity increases.Moreover,in the sample with kaolin,the bonding between anorthite crystals on the pore walls is closer than that of the other samples,which is conducive to increasing the cold crushing strength.The bonding between anorthite crystals on pore walls gradually decreases in the order of using kyanite,andalusite and sillimanite as the Al_(2)O_(3)-SiO_(2) raw material,thus their cold crushing strength decreases accordingly.In comprehensive consideration,the properties of the sample from kyanite are the optimal.Its apparent porosity,thermal conductivity and cold crushing strength are 84.6%,0.141 W·m^(-1)·K^(-1) and 1.89 MPa,respectively.展开更多
It is difficult to maintain the roadway around a fault because of the fractured surroundings,complex stress environment,and large and intense deformation in the mining process.Based on a tailgate of panel S2205 in Tun...It is difficult to maintain the roadway around a fault because of the fractured surroundings,complex stress environment,and large and intense deformation in the mining process.Based on a tailgate of panel S2205 in Tunliu colliery,in Shanxi province,China,we investigated the evolution of stress and displacement of rocks surrounding the roadway during the drivage and mining period using theoretical analysis,numerical simulation and field trial methods.We analyzed the deformation and failure mechanisms of the tailgate near a fault.The deformation of surrounding rock caused by unloading in the drivage period is large and asymmetric,the roadway convergence increases with activation of the fault and secondary fracture develops in the mining period.Therefore,we proposed a specific control technique of the roadway along a fault as follows:(1) High-strength yielding bolt not only supports the shallow rock to loadbearing structures,but also releases primary deformation energy by use of a pressure release device in order to achieve high resistance to the pressure retained;(2) Grouting of near-fault ribside after initial stabilization of the rock deformation is used to reinforce the broken rock,and to improve the integral load-bearing capacity of the roadway.The research results were successfully applied to a field trial.展开更多
目的调查HIV感染孕妇的应对方式并分析其影响因素。方法选取2019年5月—2022年1月在广州医科大学附属市八医院就诊的HIV感染孕妇300例作为样本,采用自编人口学调查问卷、自评抑郁量表(self-rated depression scale,SDS)、焦虑自评量表(s...目的调查HIV感染孕妇的应对方式并分析其影响因素。方法选取2019年5月—2022年1月在广州医科大学附属市八医院就诊的HIV感染孕妇300例作为样本,采用自编人口学调查问卷、自评抑郁量表(self-rated depression scale,SDS)、焦虑自评量表(self-ratedanxietyscale,SAS)、Buffalo艾滋病相关生活事件调查表(buffalo hiv life events survey,BHLES)、社会支持评定量表(social support rating scale,SSRS)以及医学应对方式问卷(medical coping modes questionnaire,MCMQ)进行调查。结果与全国常模比较,HIV感染孕妇面对应对方式得分低于常模(P<0.001),回避和屈服应对方式得分高于常模(均P<0.001)。多元线性回归分析结果显示,HIV感染孕妇面对应对方式的影响因素有孕前HIV感染知情、计划怀孕、艾滋病症状及SAS总分;回避应对方式的影响因素有家庭月收入、BHLES总分及支持总分;屈服应对方式的影响因素是SDS总分。结论HIV感染孕妇多采用回避和屈服应对方式。应加强患者心理疏导以及社会支持。展开更多
文摘设计了一种基于嵌入式Linux的矿用搜救机器人音视频系统。系统选用S5PV210微处理器作为主控单元,采用1/2.7 inch CMOS USB双目摄像头+BH1750光强采集+850 nm红外补光作为低照度环境下视频采集方案、本质安全电压转换方案和有线/无线通信接口,实现了矿井低照度环境下高清音视频的采集,并对采集的音视频数据进行压缩、存储、显示以及传输。
基金This work was supported by the National Natural Science Foundation of China(5180021223)Henan Provice Science&Technology Programs(232102231046 and 232102231051)Cultivation Programme for Yong Backbone Teachers in Henan University to Technology(2142121).
文摘To optimize their Al_(2)O_(3)-SiO_(2) raw materials,anorthite based insulation refractories were prepared by the in-situ sintering process combined with the foaming method after sintering at 1350℃for 3 h,using green and pollution-free kaolin,kyanite,andalusite and sillimanite as Al_(2)O_(3)-SiO_(2) raw materials,respectively,and industrial CaCO_(3) as the CaO source.Effects of Al_(2)O_(3)-SiO_(2) raw material types on the physical properties,phase composition and microstructure were investigated.The results are as follows.All samples prepared by different Al_(2)O_(3)-SiO_(2) raw materials have hexagonal flake anorthite and a small amount of mullite and corundum.Their bulk density and thermal conductivity decrease in the order of using kaolin,andalusite,kyanite and sillimanite as the Al_(2)O_(3)-SiO_(2) raw material,but their apparent porosity increases.Moreover,in the sample with kaolin,the bonding between anorthite crystals on the pore walls is closer than that of the other samples,which is conducive to increasing the cold crushing strength.The bonding between anorthite crystals on pore walls gradually decreases in the order of using kyanite,andalusite and sillimanite as the Al_(2)O_(3)-SiO_(2) raw material,thus their cold crushing strength decreases accordingly.In comprehensive consideration,the properties of the sample from kyanite are the optimal.Its apparent porosity,thermal conductivity and cold crushing strength are 84.6%,0.141 W·m^(-1)·K^(-1) and 1.89 MPa,respectively.
基金provided by the National Natural Science Foundation of China (No. 51174195)the State Key Laboratory of Coal Resources and Mine Safety(No. SKLCRSM08X04)+1 种基金the Science Foundation for Youth of China University of Mining &Technology (No. 2008A02)supported by China Scholarship Council for High-Level University Program (No.CSC[2010] 3006)
文摘It is difficult to maintain the roadway around a fault because of the fractured surroundings,complex stress environment,and large and intense deformation in the mining process.Based on a tailgate of panel S2205 in Tunliu colliery,in Shanxi province,China,we investigated the evolution of stress and displacement of rocks surrounding the roadway during the drivage and mining period using theoretical analysis,numerical simulation and field trial methods.We analyzed the deformation and failure mechanisms of the tailgate near a fault.The deformation of surrounding rock caused by unloading in the drivage period is large and asymmetric,the roadway convergence increases with activation of the fault and secondary fracture develops in the mining period.Therefore,we proposed a specific control technique of the roadway along a fault as follows:(1) High-strength yielding bolt not only supports the shallow rock to loadbearing structures,but also releases primary deformation energy by use of a pressure release device in order to achieve high resistance to the pressure retained;(2) Grouting of near-fault ribside after initial stabilization of the rock deformation is used to reinforce the broken rock,and to improve the integral load-bearing capacity of the roadway.The research results were successfully applied to a field trial.
文摘目的调查HIV感染孕妇的应对方式并分析其影响因素。方法选取2019年5月—2022年1月在广州医科大学附属市八医院就诊的HIV感染孕妇300例作为样本,采用自编人口学调查问卷、自评抑郁量表(self-rated depression scale,SDS)、焦虑自评量表(self-ratedanxietyscale,SAS)、Buffalo艾滋病相关生活事件调查表(buffalo hiv life events survey,BHLES)、社会支持评定量表(social support rating scale,SSRS)以及医学应对方式问卷(medical coping modes questionnaire,MCMQ)进行调查。结果与全国常模比较,HIV感染孕妇面对应对方式得分低于常模(P<0.001),回避和屈服应对方式得分高于常模(均P<0.001)。多元线性回归分析结果显示,HIV感染孕妇面对应对方式的影响因素有孕前HIV感染知情、计划怀孕、艾滋病症状及SAS总分;回避应对方式的影响因素有家庭月收入、BHLES总分及支持总分;屈服应对方式的影响因素是SDS总分。结论HIV感染孕妇多采用回避和屈服应对方式。应加强患者心理疏导以及社会支持。
