In order to explore alkaline solution's enhancement on coal's chemical permeabilityꎬ pore test and adsorption test were carried out to analyze influence of alkaline solution on chemical erosion effect of coal and its adsorption capacity of methane. With Qingdong coal mine from Anhui Province as research objectꎬ samples' pore and methane capacity characteristics before and after alkaline solution treatment were tested with low temperature liquid nitrogen adsorption method and isothermal adsorption method. Thenꎬ experiment results were quantitatively discussed using fractal theory and adsorption theory. The results show that alkaline solution can effectively change pore structure of coal and increase content of micropores at pore size less than 5 nm. Coal samples ' adsorption capacity greatly improves with its maximum value increasing from 17 83 mL / g to 21 97 mL / g after alkali treatment.
为探讨碱性溶液对煤化学渗透性的增强作用ꎬ进行了孔隙试验和吸附试验，分析了碱性溶液对煤化学侵蚀效果及其对甲烷吸附能力的影响。以安徽青东煤矿为研究对象ꎬ采用低温液氮吸附法和等温吸附法对碱溶液处理前后样品的孔隙和甲烷容量特征进行了测试。然后用分形理论和吸附理论对ꎬ实验结果进行了定量讨论。结果表明:碱性溶液能有效改变煤的孔隙结构，增加孔径小于5 nm的微孔含量;煤样的吸附量大大提高，碱处理后的吸附量最大值从1783 mL / g增加到2197 mL / g。
{"title":"Influence mechanism of alkaline solution on methane adsorption of coal","authors":"Zhou Yinbo, Wang Siqi, Zhao Zhou, Guan Pinpin, Xu Jingxin, Wu Jin-gang","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.04.005","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.04.005","url":null,"abstract":"In order to explore alkaline solution's enhancement on coal's chemical permeabilityꎬ pore test and adsorption test were carried out to analyze influence of alkaline solution on chemical erosion effect of coal and its adsorption capacity of methane. With Qingdong coal mine from Anhui Province as research objectꎬ samples' pore and methane capacity characteristics before and after alkaline solution treatment were tested with low temperature liquid nitrogen adsorption method and isothermal adsorption method. Thenꎬ experiment results were quantitatively discussed using fractal theory and adsorption theory. The results show that alkaline solution can effectively change pore structure of coal and increase content of micropores at pore size less than 5 nm. Coal samples ' adsorption capacity greatly improves with its maximum value increasing from 17 83 mL / g to 21 97 mL / g after alkali treatment.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"17 1","pages":"28"},"PeriodicalIF":0.0,"publicationDate":"2021-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80497023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-27DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.04.016
Zhou Hua, Zhang Qiaoyu, Mu Yaoyao, Tan Zhengping, Sun Qing, Zhang Daowen
In order to provide an effective scenario deduction and construction scheme for research and development of intelligent vehiclesꎬ statistical analysis was conducted on data of accident scenarios between passenger vehicles and two ̄wheelers at crossroads from National Automobile Accident In ̄depth Investigation System ( NAIS) databaseꎬ and two types of basic scenarios with high proportion were obtained. Thenꎬ seven scenario correlation variables were selected for cluster analysis on static characteristics of these two types of scenarios. Finallyꎬ a kinematics deduction model was establishedꎬ and furthermoreꎬ considering actual threshold of dynamic parameters of five types of typical dangerous scenariosꎬ speed ̄distance danger models of them were constructed. The results show that through methods of statistical classificationꎬ cluster analysis and kinematic model superposition deductionꎬ five kinds of 第 4 期 周华等: 十字路口乘用车与二轮车典型危险场景聚类及推演 typical hazard scenes of passenger cars and two ̄wheeled vehicles at intersections can be obtained in conformity with traffic situation in Chinaꎬ and moreover five sets of dangerous scenarios are obtained.
{"title":"Clustering and deduction of typical dangerous scenarios between passenger vehicles and two-wheelers at crossroads","authors":"Zhou Hua, Zhang Qiaoyu, Mu Yaoyao, Tan Zhengping, Sun Qing, Zhang Daowen","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.04.016","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.04.016","url":null,"abstract":"In order to provide an effective scenario deduction and construction scheme for research and development of intelligent vehiclesꎬ statistical analysis was conducted on data of accident scenarios between passenger vehicles and two ̄wheelers at crossroads from National Automobile Accident In ̄depth Investigation System ( NAIS) databaseꎬ and two types of basic scenarios with high proportion were obtained. Thenꎬ seven scenario correlation variables were selected for cluster analysis on static characteristics of these two types of scenarios. Finallyꎬ a kinematics deduction model was establishedꎬ and furthermoreꎬ considering actual threshold of dynamic parameters of five types of typical dangerous scenariosꎬ speed ̄distance danger models of them were constructed. The results show that through methods of statistical classificationꎬ cluster analysis and kinematic model superposition deductionꎬ five kinds of 第 4 期 周华等: 十字路口乘用车与二轮车典型危险场景聚类及推演 typical hazard scenes of passenger cars and two ̄wheeled vehicles at intersections can be obtained in conformity with traffic situation in Chinaꎬ and moreover five sets of dangerous scenarios are obtained.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"14 1","pages":"100"},"PeriodicalIF":0.0,"publicationDate":"2021-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80299002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-27DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.04.013
Gao Yang, Wu Wentao, J. Xiaoshan, XU Minghe
In order to reduce risk of collision between non ̄cooperative large UAVsꎬ firstlyꎬ in light of analysis on their operation modeꎬ predication mechanism and procedure of flight conflict based on UAVs operation and management platform were proposed. Secondlyꎬ a conflict prediction model building on UAVs flight state data was proposedꎬ which predicted conflicts in both horizontal and vertical directions and determined whether there would be a conflict. And then warning threshold was analyzed to prevent too late reception of alarm information by UAVs ground station. Finallyꎬ real ̄time flight status data of 3 UAVs were used to analyze and verify the model. The results show that the proposed mechanism and program can realize prediction and early warning between non ̄cooperative large UAVsꎬ and the prediction model can accurately determine whether there is a flight conflict as well as calculate when it will happen.
{"title":"Research on flight conflict prediction method for non-cooperative large unmanned aerial vehicles","authors":"Gao Yang, Wu Wentao, J. Xiaoshan, XU Minghe","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.04.013","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.04.013","url":null,"abstract":"In order to reduce risk of collision between non ̄cooperative large UAVsꎬ firstlyꎬ in light of analysis on their operation modeꎬ predication mechanism and procedure of flight conflict based on UAVs operation and management platform were proposed. Secondlyꎬ a conflict prediction model building on UAVs flight state data was proposedꎬ which predicted conflicts in both horizontal and vertical directions and determined whether there would be a conflict. And then warning threshold was analyzed to prevent too late reception of alarm information by UAVs ground station. Finallyꎬ real ̄time flight status data of 3 UAVs were used to analyze and verify the model. The results show that the proposed mechanism and program can realize prediction and early warning between non ̄cooperative large UAVsꎬ and the prediction model can accurately determine whether there is a flight conflict as well as calculate when it will happen.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"11 1","pages":"80"},"PeriodicalIF":0.0,"publicationDate":"2021-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79108462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-27DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.04.011
Guo Pengwei, Tang Yibo, Wang Hua’e, Huang Shihua, Zhou Jinqiang
In order to explore dangerous impacts of polyurethane on coal spontaneous combustionꎬ kinetic characteristics before and after introduction of polyurethane were studied through experiment and analyzed by using thermal analysis. Thenꎬ kinetic parameters were calculated with Flynn ̄Wall ̄Ozawa (FWO) and Starink models. Finallyꎬ mechanism function was determined by Bagchi method. The results show that with existence of polyurethaneꎬ reaction is accelerated and weight loss rate increases greatly in the initial stage (168-300 °C). Howeverꎬ the latter becomes relatively mild in subsequent stage of high temperature (465-714 °C) with value of activation energy being increased by about 6 kJ / mol compared with that before addition of polyurethane. And when reaction stopsꎬ final residual mass is approximately zeroꎬ and reaction is more complete than that of coal pyrolysis alone. Anthracite coal conforms to the randomly nucleating and nucleus growth model while mixture of coal and polyurethane is more inclined to first ̄order chemical reaction mechanism.
{"title":"Study on kinetics features of coal spontaneous combustion influenced by polyurethane","authors":"Guo Pengwei, Tang Yibo, Wang Hua’e, Huang Shihua, Zhou Jinqiang","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.04.011","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.04.011","url":null,"abstract":"In order to explore dangerous impacts of polyurethane on coal spontaneous combustionꎬ kinetic characteristics before and after introduction of polyurethane were studied through experiment and analyzed by using thermal analysis. Thenꎬ kinetic parameters were calculated with Flynn ̄Wall ̄Ozawa (FWO) and Starink models. Finallyꎬ mechanism function was determined by Bagchi method. The results show that with existence of polyurethaneꎬ reaction is accelerated and weight loss rate increases greatly in the initial stage (168-300 °C). Howeverꎬ the latter becomes relatively mild in subsequent stage of high temperature (465-714 °C) with value of activation energy being increased by about 6 kJ / mol compared with that before addition of polyurethane. And when reaction stopsꎬ final residual mass is approximately zeroꎬ and reaction is more complete than that of coal pyrolysis alone. Anthracite coal conforms to the randomly nucleating and nucleus growth model while mixture of coal and polyurethane is more inclined to first ̄order chemical reaction mechanism.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"79 1","pages":"68"},"PeriodicalIF":0.0,"publicationDate":"2021-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84101811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-27DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.04.020
Yao Yishu, Lu Wei
In order to explore design rationality of landings at egress door of kindergartens and to fill in the blank of children's evacuation behavior data in this partꎬ evacuation drills on landings at egress doors in two fulltime six ̄classroom kindergartens were conducted and evacuation behavioral data at landings of 4 different designs were obtained. Thenꎬ their walking speedꎬ evacuation time and flow rate were analyzed and compared. The results show that walking speed of children aged 4-6 on non ̄smooth steps is between 0 52-0 98 m / s. Design difference of landings has obvious influence on children's evacuation behavior and evacuation effectꎬ and double ̄sided landings can increase flow rate by 1 8 times.
为探索幼儿园出口楼梯口设计的合理性，填补本部分儿童疏散行为数据的空白ꎬ对两所全日制六教室幼儿园进行了出口楼梯口疏散演练，获得了4种不同设计的楼梯口疏散行为数据。然后对ꎬ他们的行走速度ꎬ疏散时间和流量进行分析比较。结果表明:4-6岁儿童在非光滑台阶上的行走速度在052 ~ 098 m / s之间，着陆的设计差异对儿童的疏散行为和疏散效果有明显影响ꎬ，双面着陆可使流量提高18倍。
{"title":"Influence of designs of landings at egress doors on children's evacuation behaviors","authors":"Yao Yishu, Lu Wei","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.04.020","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.04.020","url":null,"abstract":"In order to explore design rationality of landings at egress door of kindergartens and to fill in the blank of children's evacuation behavior data in this partꎬ evacuation drills on landings at egress doors in two fulltime six ̄classroom kindergartens were conducted and evacuation behavioral data at landings of 4 different designs were obtained. Thenꎬ their walking speedꎬ evacuation time and flow rate were analyzed and compared. The results show that walking speed of children aged 4-6 on non ̄smooth steps is between 0 52-0 98 m / s. Design difference of landings has obvious influence on children's evacuation behavior and evacuation effectꎬ and double ̄sided landings can increase flow rate by 1 8 times.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"31 1","pages":"127"},"PeriodicalIF":0.0,"publicationDate":"2021-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84984635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-27DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.04.012
Song Yinghua, Tu Wenhao, Huo Feizhou, Lyu Wei, Fang Danhui
In order to study influence of obstacle crossing behaviors on pedestrian evacuationꎬ a cellular automation model of evacuation considering such behaviors is established. Concept of risk degree was introduced in the model and used to define surmountable obstacles and unsurmountable obstacles. And through two different neighborhoodsꎬ crossing obstacles was realized. Thenꎬ a scenario of evacuation after earthquake was created to simulate evacuation process with different initial pedestrian density and 第 4 期 宋英华等: 考虑跨越障碍物行为的元胞自动机模型 proportion of pedestrians crossing obstaclesꎬ and influence of initial densityꎬ obstacle crossing behaviors and pedestrian ratio on evacuation process was analyzed. The results show that obstacle crossing behaviors make simulation process more consistent with pedestrian's movement mode in reality and eliminate some obstructions caused for them to detour obstacles. Increasing initial pedestrian density has less effect on scenes of crossing obstacles than on detouring obstacles. When they are faced with surmountable obstaclesꎬ the higher the proportion of pedestrians crossing obstacles isꎬ the shorter time evacuation takes.
{"title":"Cellular automation model of pedestrian evacuation considering obstacle crossing behaviors","authors":"Song Yinghua, Tu Wenhao, Huo Feizhou, Lyu Wei, Fang Danhui","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.04.012","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.04.012","url":null,"abstract":"In order to study influence of obstacle crossing behaviors on pedestrian evacuationꎬ a cellular automation model of evacuation considering such behaviors is established. Concept of risk degree was introduced in the model and used to define surmountable obstacles and unsurmountable obstacles. And through two different neighborhoodsꎬ crossing obstacles was realized. Thenꎬ a scenario of evacuation after earthquake was created to simulate evacuation process with different initial pedestrian density and 第 4 期 宋英华等: 考虑跨越障碍物行为的元胞自动机模型 proportion of pedestrians crossing obstaclesꎬ and influence of initial densityꎬ obstacle crossing behaviors and pedestrian ratio on evacuation process was analyzed. The results show that obstacle crossing behaviors make simulation process more consistent with pedestrian's movement mode in reality and eliminate some obstructions caused for them to detour obstacles. Increasing initial pedestrian density has less effect on scenes of crossing obstacles than on detouring obstacles. When they are faced with surmountable obstaclesꎬ the higher the proportion of pedestrians crossing obstacles isꎬ the shorter time evacuation takes.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"30 1","pages":"74"},"PeriodicalIF":0.0,"publicationDate":"2021-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84413561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-28DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.12.024
Tu Zhijun, Geng Shibin, Li Yong
{"title":"Experimental study on human physiological responses under different CO2 concentration in underground engineering","authors":"Tu Zhijun, Geng Shibin, Li Yong","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.12.024","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.12.024","url":null,"abstract":"","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"26 1","pages":"173"},"PeriodicalIF":0.0,"publicationDate":"2020-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74202880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-28DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.12.005
Chen Yuan-jiang, Cheng Shuangyi, Feng juan Wei, Duan Linling, J. Zhiqiang
{"title":"Research on safety information feedback and its failure mechanism","authors":"Chen Yuan-jiang, Cheng Shuangyi, Feng juan Wei, Duan Linling, J. Zhiqiang","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.12.005","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.12.005","url":null,"abstract":"","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"77 1","pages":"30"},"PeriodicalIF":0.0,"publicationDate":"2020-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84790745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-28DOI: 10.16265/J.CNKI.ISSN1003-3033.2020.11.025
Zheng Yan-hui, Zhu Chang-feng, Wang Qing-rong, Liu Sinan, MA Yangyang
{"title":"Bi-objective optimization of emergency material game allocation considering limited rationality","authors":"Zheng Yan-hui, Zhu Chang-feng, Wang Qing-rong, Liu Sinan, MA Yangyang","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.11.025","DOIUrl":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.11.025","url":null,"abstract":"","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"75 1","pages":"168"},"PeriodicalIF":0.0,"publicationDate":"2020-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88176814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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