目的了解贵阳市男男性行为者(men who have sex with men,MSM)焦虑、抑郁现状,分析MSM焦虑、抑郁的相关影响因素。方法通过方便抽样法招募MSM,问卷收集MSM人口学、性相关特征与行为、其他健康相关行为信息;采用社会支持量表、焦虑自评...目的了解贵阳市男男性行为者(men who have sex with men,MSM)焦虑、抑郁现状,分析MSM焦虑、抑郁的相关影响因素。方法通过方便抽样法招募MSM,问卷收集MSM人口学、性相关特征与行为、其他健康相关行为信息;采用社会支持量表、焦虑自评量表和抑郁自评量表测评MSM的社会支持、焦虑和抑郁;进行人类免疫缺陷病毒(human immunodeficiency virus,HIV)抗体血清学检测;利用SPSS 20.0软件建立多因素logistic回归模型分析MSM焦虑、抑郁的影响因素。结果共计招募到420名MSM,合格问卷403份,合格率为95.95%;MSM焦虑、抑郁检出率分别为23.82%、32.51%;多因素logistic回归分析结果显示,最近1周是否发生同性肛交性行为、最近1个月平均每天吸烟量、社会支持是MSM焦虑的影响因素;月收入、最近1个月平均每天吸烟量、社会支持是MSM抑郁的影响因素。结论贵阳市MSM人群中有一定比例的轻度焦虑、抑郁症状患者,焦虑、抑郁与收入、性相关行为、吸烟、社会支持有关。展开更多
为了能够利用材料数据和有限元分析结果对结构件的低循环疲劳寿命进行评估,提出一种基于拉伸应变能且考虑平均应力、应力集中和尺寸效应等多种因素的寿命预测方法,并推导了不同应力比下拉伸应变能公式。采用材料手册中的数据以及已有的...为了能够利用材料数据和有限元分析结果对结构件的低循环疲劳寿命进行评估,提出一种基于拉伸应变能且考虑平均应力、应力集中和尺寸效应等多种因素的寿命预测方法,并推导了不同应力比下拉伸应变能公式。采用材料手册中的数据以及已有的试验数据对该模型进行验证,寿命预测结果和试验结果一致性较好,对比局部应变法寿命预测精度大大提高。该方法预测的两类轮盘模拟件疲劳寿命均在2倍分散带之内,在工程中有较为广阔的运用前景。To evaluate the low cycle fatigue life of structural parts by using material data and finite element analysis results, a life prediction method was proposed based on tensile strain energy. This method considered multiple factors such as average stress, stress concentration and size effect. The tensile strain energy formula under different stress ratios was further derived. The data in the material manual and the existing test data are used to verify the model. The life prediction results are in good agreement with the test results, and the life prediction accuracy is greatly improved compared with the local strain method. The fatigue life predicted by this method for the two types of wheel simulators is within 2 times error band, which has a broad application prospect in engineering.展开更多
文摘目的了解贵阳市男男性行为者(men who have sex with men,MSM)焦虑、抑郁现状,分析MSM焦虑、抑郁的相关影响因素。方法通过方便抽样法招募MSM,问卷收集MSM人口学、性相关特征与行为、其他健康相关行为信息;采用社会支持量表、焦虑自评量表和抑郁自评量表测评MSM的社会支持、焦虑和抑郁;进行人类免疫缺陷病毒(human immunodeficiency virus,HIV)抗体血清学检测;利用SPSS 20.0软件建立多因素logistic回归模型分析MSM焦虑、抑郁的影响因素。结果共计招募到420名MSM,合格问卷403份,合格率为95.95%;MSM焦虑、抑郁检出率分别为23.82%、32.51%;多因素logistic回归分析结果显示,最近1周是否发生同性肛交性行为、最近1个月平均每天吸烟量、社会支持是MSM焦虑的影响因素;月收入、最近1个月平均每天吸烟量、社会支持是MSM抑郁的影响因素。结论贵阳市MSM人群中有一定比例的轻度焦虑、抑郁症状患者,焦虑、抑郁与收入、性相关行为、吸烟、社会支持有关。
文摘为了能够利用材料数据和有限元分析结果对结构件的低循环疲劳寿命进行评估,提出一种基于拉伸应变能且考虑平均应力、应力集中和尺寸效应等多种因素的寿命预测方法,并推导了不同应力比下拉伸应变能公式。采用材料手册中的数据以及已有的试验数据对该模型进行验证,寿命预测结果和试验结果一致性较好,对比局部应变法寿命预测精度大大提高。该方法预测的两类轮盘模拟件疲劳寿命均在2倍分散带之内,在工程中有较为广阔的运用前景。To evaluate the low cycle fatigue life of structural parts by using material data and finite element analysis results, a life prediction method was proposed based on tensile strain energy. This method considered multiple factors such as average stress, stress concentration and size effect. The tensile strain energy formula under different stress ratios was further derived. The data in the material manual and the existing test data are used to verify the model. The life prediction results are in good agreement with the test results, and the life prediction accuracy is greatly improved compared with the local strain method. The fatigue life predicted by this method for the two types of wheel simulators is within 2 times error band, which has a broad application prospect in engineering.
