For an odd prime number p, and positive integers k and , we denote , a digraph for which is the set of vertices and there is a directed edge from u to v if , where . In this work, we study isolated and non...For an odd prime number p, and positive integers k and , we denote , a digraph for which is the set of vertices and there is a directed edge from u to v if , where . In this work, we study isolated and non-isolated fixed points (or loops) in digraphs arising from Discrete Lambert Mapping. It is shown that if , then all fixed points in are isolated. It is proved that the digraph has isolated fixed points only if . It has been characterized that has no cycles except fixed points if and only if either g is of order 2 or g is divisible by p. As an application of these loops, the solvability of the exponential congruence has been discussed.展开更多
目的了解农村失能老年人抑郁状况,并探讨其影响因素。方法基于2015年中国健康与养老追踪调查数据(China health and retirement longitudinal study,CHARLS),纳入836名受访者。运用order logit模型分析中国农村失能老年人抑郁状况的影...目的了解农村失能老年人抑郁状况,并探讨其影响因素。方法基于2015年中国健康与养老追踪调查数据(China health and retirement longitudinal study,CHARLS),纳入836名受访者。运用order logit模型分析中国农村失能老年人抑郁状况的影响因素,并通过分失能程度估计研究样本异质性。结果有55.74%的农村失能老年人精神亚健康,其中抑郁状况一般的为35.05%,抑郁状况差的为20.69%。基本特征、生活状况、健康状况、社会经济特征、代际支持五方面变量在不同程度上影响农村失能老年人抑郁状况。儿女数量对总样本抑郁状况的影响差异无统计学意义,但女儿数量(OR=1.416,95%CI:1.055~1.901,P=0.020)和儿子数量(OR=2.012,95%CI:1.579~2.564,P=0.043)分别对中度和重度农村失能老年人抑郁状况产生负向影响,与孙辈同村(OR=0.732,95%CI:0.554~0.966,P=0.028)对农村失能老年人抑郁状况的影响差异有统计学意义,对重度失能老年人抑郁状况产生正向影响(OR=0.527,95%CI:0.341~0.813,P=0.034)。结论农村失能老年人抑郁状况受多元因素共同影响。"养儿防老"与"多子多福"现象正在逐渐消失,"隔辈亲"现象依旧存在。展开更多
游客满意度是休闲渔业景区制定管理决策的重要参考信息。通过探究游览过程中游客对各单一维度的满意程度与旅游总满意度之间的关系,管理者可以从中准确了解游客偏好、消费行为以及获取旅游产品设计等重要信息。据此,本文采取实地调研,获...游客满意度是休闲渔业景区制定管理决策的重要参考信息。通过探究游览过程中游客对各单一维度的满意程度与旅游总满意度之间的关系,管理者可以从中准确了解游客偏好、消费行为以及获取旅游产品设计等重要信息。据此,本文采取实地调研,获取11家全国休闲渔业示范基地1510份游客满意度信息,使用马尔科夫链蒙特卡洛法(Markov Chain Monte Carlo,MCMC),估算贝叶斯多元有序probit模型,并利用模型后验结果衡量休闲渔业游客7种分满意度对总体满意度的贡献。研究结果表明:渔憩体验满意度、景区环境满意度以及旅游餐饮满意度是对总体满意度影响程度最大的三种分满意度,所占比例分别为43.58%、24.67%、10.62%。展开更多
文摘For an odd prime number p, and positive integers k and , we denote , a digraph for which is the set of vertices and there is a directed edge from u to v if , where . In this work, we study isolated and non-isolated fixed points (or loops) in digraphs arising from Discrete Lambert Mapping. It is shown that if , then all fixed points in are isolated. It is proved that the digraph has isolated fixed points only if . It has been characterized that has no cycles except fixed points if and only if either g is of order 2 or g is divisible by p. As an application of these loops, the solvability of the exponential congruence has been discussed.
文摘目的了解农村失能老年人抑郁状况,并探讨其影响因素。方法基于2015年中国健康与养老追踪调查数据(China health and retirement longitudinal study,CHARLS),纳入836名受访者。运用order logit模型分析中国农村失能老年人抑郁状况的影响因素,并通过分失能程度估计研究样本异质性。结果有55.74%的农村失能老年人精神亚健康,其中抑郁状况一般的为35.05%,抑郁状况差的为20.69%。基本特征、生活状况、健康状况、社会经济特征、代际支持五方面变量在不同程度上影响农村失能老年人抑郁状况。儿女数量对总样本抑郁状况的影响差异无统计学意义,但女儿数量(OR=1.416,95%CI:1.055~1.901,P=0.020)和儿子数量(OR=2.012,95%CI:1.579~2.564,P=0.043)分别对中度和重度农村失能老年人抑郁状况产生负向影响,与孙辈同村(OR=0.732,95%CI:0.554~0.966,P=0.028)对农村失能老年人抑郁状况的影响差异有统计学意义,对重度失能老年人抑郁状况产生正向影响(OR=0.527,95%CI:0.341~0.813,P=0.034)。结论农村失能老年人抑郁状况受多元因素共同影响。"养儿防老"与"多子多福"现象正在逐渐消失,"隔辈亲"现象依旧存在。
文摘游客满意度是休闲渔业景区制定管理决策的重要参考信息。通过探究游览过程中游客对各单一维度的满意程度与旅游总满意度之间的关系,管理者可以从中准确了解游客偏好、消费行为以及获取旅游产品设计等重要信息。据此,本文采取实地调研,获取11家全国休闲渔业示范基地1510份游客满意度信息,使用马尔科夫链蒙特卡洛法(Markov Chain Monte Carlo,MCMC),估算贝叶斯多元有序probit模型,并利用模型后验结果衡量休闲渔业游客7种分满意度对总体满意度的贡献。研究结果表明:渔憩体验满意度、景区环境满意度以及旅游餐饮满意度是对总体满意度影响程度最大的三种分满意度,所占比例分别为43.58%、24.67%、10.62%。
