Taking the distribution route optimization of refined oil as background, this paper studies the inventory routing problem of refined oil distribution based on working time equilibrium. In consideration of the constrai...Taking the distribution route optimization of refined oil as background, this paper studies the inventory routing problem of refined oil distribution based on working time equilibrium. In consideration of the constraints of vehicle capacity, time window for unloading oil, service time and demand of each gas station, we take the working time equilibrium of each vehicle as goal and establish an integer programming model for the vehicle routing problem of refined oil distribution, the objective function of the model is to minimize the maximum working time of vehicles. To solve this model, a Lingo program was written and a heuristic algorithm was designed. We further use the random generation method to produce an example with 10 gas stations. The local optimal solution and approximate optimal solution are obtained by using Lingo software and heuristic algorithm respectively. By comparing the approximate optimal solution obtained by heuristic algorithm with the local optimal solution obtained by Lingo software, the feasibility of the model and the effectiveness of the heuristic algorithm are verified. The results of this paper provide a theoretical basis for the scheduling department to formulate the oil distribution plan.展开更多
There is growing interest in the correlation between working time and environmental pressures,but prior empirical studies mostly focused on static methodologies.This article used dynamic panel regression approaches to...There is growing interest in the correlation between working time and environmental pressures,but prior empirical studies mostly focused on static methodologies.This article used dynamic panel regression approaches to examine and compare the relationship among western,southern,and northern European countries over the period 1970-2010,and proved the existence of strongly significant relationships in all models.Furthermore,this article detected the relationship between working hours and environmental indicators(carbon emission and energy use) at different phases.We contribute to a further understanding of the environmental effects of the working time reduction policy by comparing the differences among various periods and country groups in a system generalized method of moments(GMM) dynamic framework.展开更多
China is witnessing a very complicated economic development environment.Migrant workers'working patterns will directly affect their income level and the realization of many economic and social development goals.Th...China is witnessing a very complicated economic development environment.Migrant workers'working patterns will directly affect their income level and the realization of many economic and social development goals.This paper collects relevant data from three places:Shanghai,Lanzhou and Chengdu for empirical research whose results show that determinants of migrant worker's willing working time in urban areas mainly include the“income-consumption difference”,“urban-rural consumption difference”and their“urban income and expenditure uncertainty”.These factors directly affect their effective working time in the city,and determine their choice of choosing corresponding work patterns.From the significant differences of these factors,we can see that migrant workers in China is still struggling to solve their material needs under the pressure of livelihood,and less attention is paid to their spiritual needs and the pursuit of quality of life.展开更多
30 college students who have the habit of lunch time napping (LTN) participated in experiments under two different conditions: Having lunch time napping and not having lunch time napping. They were asked to complete t...30 college students who have the habit of lunch time napping (LTN) participated in experiments under two different conditions: Having lunch time napping and not having lunch time napping. They were asked to complete three tasks in-cluding vigilance reaction, short-term memory, addition arithmetic;their performance was re-corded automatically by computer during 3 dif-ferent periods in the afternoon and early eve-ning. The analysis about the experimental data showed that: as for habitual nappers, midafter-noon nap zone existed, LTN played a very im-portant role in overcoming it, and did great help in enhancing their vigilance in the afternoon and early evening, however, LTN didn’t bring sig-nificant positive effect to executing complex tasks (such as short-term memory and addition task) at the periods of time 16:30-17:30, 20:00- 21:00. Finally, this article discussed the conclu-sions and its significance.展开更多
目的探讨多模态超声心动图对肺动脉高压患者右心功能的诊断效能。方法选取2022年1月至2023年8月于金华市中心医院就诊的80例肺动脉高压患者纳入观察组,根据患者的肺动脉收缩压将其分为轻度组[40~50mmHg(1mmHg=0.133kPa),36例]、中度组(5...目的探讨多模态超声心动图对肺动脉高压患者右心功能的诊断效能。方法选取2022年1月至2023年8月于金华市中心医院就诊的80例肺动脉高压患者纳入观察组,根据患者的肺动脉收缩压将其分为轻度组[40~50mmHg(1mmHg=0.133kPa),36例]、中度组(51~70mmHg,20例)和重度组(>70mmHg,24例);选取同期健康体检者80名纳入对照组,所有受试者均进行多模态超声心动图检测,对比其超声检查相关数据,评估多模态超声心动图对肺动脉高压患者右室收缩功能的诊断效能。结果观察组患者的右室舒张末期容积(right ventricular end diastolic volume,RVEDV)、右室收缩末期容积(right ventricular end systolic volume,RVESV)、右室整体无效做功(right ventricular global waste work,RVGWW)均显著高于对照组,右室每搏输出量(right ventricular stroke volume,RVSV)、右室射血分数(right ventrical ejection fraction,RVEF)、三尖瓣环收缩期位移(tricuspid annular plane systolic excusion,TAPSE)、整体纵向应变(global longitudinal strain,GLS)、右室整体做功效率(right ventricular global work efficiency,RVGWE)、右室整体做功指数(right ventricular global work index,RVGWI)、右室整体有效做功(right ventricular global constructive work,RVGCW)均显著低于对照组(P<0.05)。重度组患者的RVEDV、RVESV及RVGWW均显著高于中度组、轻度组,RVSV、RVEF、RVGWE、RVGWI、RVGCW均显著低于中度组、轻度组(P<0.05)。TAPSE、GLS、RVSV、RVEF、RVGWI五项联合诊断肺动脉高压患者右心功能的曲线下面积为0.911,敏感度为92.23%,特异性为96.45%。结论多模态超声心动图能有效评价肺动脉高压患者的右室收缩功能,值得临床推广应用。展开更多
文摘Taking the distribution route optimization of refined oil as background, this paper studies the inventory routing problem of refined oil distribution based on working time equilibrium. In consideration of the constraints of vehicle capacity, time window for unloading oil, service time and demand of each gas station, we take the working time equilibrium of each vehicle as goal and establish an integer programming model for the vehicle routing problem of refined oil distribution, the objective function of the model is to minimize the maximum working time of vehicles. To solve this model, a Lingo program was written and a heuristic algorithm was designed. We further use the random generation method to produce an example with 10 gas stations. The local optimal solution and approximate optimal solution are obtained by using Lingo software and heuristic algorithm respectively. By comparing the approximate optimal solution obtained by heuristic algorithm with the local optimal solution obtained by Lingo software, the feasibility of the model and the effectiveness of the heuristic algorithm are verified. The results of this paper provide a theoretical basis for the scheduling department to formulate the oil distribution plan.
基金supported by the State Scholarship Fund under the China Scholarship Council[grant number 201306240017]
文摘There is growing interest in the correlation between working time and environmental pressures,but prior empirical studies mostly focused on static methodologies.This article used dynamic panel regression approaches to examine and compare the relationship among western,southern,and northern European countries over the period 1970-2010,and proved the existence of strongly significant relationships in all models.Furthermore,this article detected the relationship between working hours and environmental indicators(carbon emission and energy use) at different phases.We contribute to a further understanding of the environmental effects of the working time reduction policy by comparing the differences among various periods and country groups in a system generalized method of moments(GMM) dynamic framework.
基金The National Social Science Fund of China:Study on the Impact of Migrant Workers'Migrant Birds Work Mode and Employment Security in the Process of Urbanization(15XJL011)。
文摘China is witnessing a very complicated economic development environment.Migrant workers'working patterns will directly affect their income level and the realization of many economic and social development goals.This paper collects relevant data from three places:Shanghai,Lanzhou and Chengdu for empirical research whose results show that determinants of migrant worker's willing working time in urban areas mainly include the“income-consumption difference”,“urban-rural consumption difference”and their“urban income and expenditure uncertainty”.These factors directly affect their effective working time in the city,and determine their choice of choosing corresponding work patterns.From the significant differences of these factors,we can see that migrant workers in China is still struggling to solve their material needs under the pressure of livelihood,and less attention is paid to their spiritual needs and the pursuit of quality of life.
文摘30 college students who have the habit of lunch time napping (LTN) participated in experiments under two different conditions: Having lunch time napping and not having lunch time napping. They were asked to complete three tasks in-cluding vigilance reaction, short-term memory, addition arithmetic;their performance was re-corded automatically by computer during 3 dif-ferent periods in the afternoon and early eve-ning. The analysis about the experimental data showed that: as for habitual nappers, midafter-noon nap zone existed, LTN played a very im-portant role in overcoming it, and did great help in enhancing their vigilance in the afternoon and early evening, however, LTN didn’t bring sig-nificant positive effect to executing complex tasks (such as short-term memory and addition task) at the periods of time 16:30-17:30, 20:00- 21:00. Finally, this article discussed the conclu-sions and its significance.
文摘目的探讨多模态超声心动图对肺动脉高压患者右心功能的诊断效能。方法选取2022年1月至2023年8月于金华市中心医院就诊的80例肺动脉高压患者纳入观察组,根据患者的肺动脉收缩压将其分为轻度组[40~50mmHg(1mmHg=0.133kPa),36例]、中度组(51~70mmHg,20例)和重度组(>70mmHg,24例);选取同期健康体检者80名纳入对照组,所有受试者均进行多模态超声心动图检测,对比其超声检查相关数据,评估多模态超声心动图对肺动脉高压患者右室收缩功能的诊断效能。结果观察组患者的右室舒张末期容积(right ventricular end diastolic volume,RVEDV)、右室收缩末期容积(right ventricular end systolic volume,RVESV)、右室整体无效做功(right ventricular global waste work,RVGWW)均显著高于对照组,右室每搏输出量(right ventricular stroke volume,RVSV)、右室射血分数(right ventrical ejection fraction,RVEF)、三尖瓣环收缩期位移(tricuspid annular plane systolic excusion,TAPSE)、整体纵向应变(global longitudinal strain,GLS)、右室整体做功效率(right ventricular global work efficiency,RVGWE)、右室整体做功指数(right ventricular global work index,RVGWI)、右室整体有效做功(right ventricular global constructive work,RVGCW)均显著低于对照组(P<0.05)。重度组患者的RVEDV、RVESV及RVGWW均显著高于中度组、轻度组,RVSV、RVEF、RVGWE、RVGWI、RVGCW均显著低于中度组、轻度组(P<0.05)。TAPSE、GLS、RVSV、RVEF、RVGWI五项联合诊断肺动脉高压患者右心功能的曲线下面积为0.911,敏感度为92.23%,特异性为96.45%。结论多模态超声心动图能有效评价肺动脉高压患者的右室收缩功能,值得临床推广应用。
