This study determined the sources from which Vietnamese high school students currently acquire sexual knowledge as well as the sources from which they believe they should acquire it. Participants were eleventh-grade s...This study determined the sources from which Vietnamese high school students currently acquire sexual knowledge as well as the sources from which they believe they should acquire it. Participants were eleventh-grade students at three public high schools in Hanoi, Vietnam. We conducted a questionnaire-based survey from September to October 2012, with 1672 students participating. Responses were received from all 1672 students, a response rate of 100%. Complete data were received from 1653 respondents (98.9%), including 896 males (54.2%) and 757 females (45.8%). The survey was a self-administrated questionnaire. Although many participants believed that they were knowledgeable about sex, only a small number of them actually possessed accurate sexual knowledge. Few participants in this study, targeted to a specific age (eleventh grade), had used the Internet as a major source for obtaining sexual knowledge, in contrast to results from previous studies which covered a wider age demographic. Future research should include comparative studies between eleventh and twelfth graders as well as between those of the same age who are and who are not enrolled in high school. Additionally, it might be beneficial to consider the relationship between adolescent age and Internet use to study the influence of the Internet on sexual knowledge. Our results suggest that parents and schoolteachers should shoulder more responsibility in providing sexual education, particularly by improving their own knowledge and ability to provide such education, because many participants indicated that sexual knowledge should be acquired from parents and schools.展开更多
目的了解健康中国背景下新疆某大学医学生心理健康水平和压力源,并分析其影响因素。方法采用分层整群随机抽样法抽取2021年2~4月新疆维吾尔自治区某大学4421名医学生,采用症状自评量表(Symptom Check List 90,SCL-90)和当代大学生压力...目的了解健康中国背景下新疆某大学医学生心理健康水平和压力源,并分析其影响因素。方法采用分层整群随机抽样法抽取2021年2~4月新疆维吾尔自治区某大学4421名医学生,采用症状自评量表(Symptom Check List 90,SCL-90)和当代大学生压力源量表进行问卷调查。结果25.26%医学生存在不同程度SCL-90量表所列症状;SCL-90各因子分均低于全国部分地区大学生常模(P<0.05);SCL-90量表中躯体化、强迫症状、抑郁和恐怖因子得分女生显著高于男生(P<0.05);主要压力源为发展困扰型;疆外生源学生发展困扰型压力源得分高于疆内生源学生(P<0.05);女生压力高于男生,女生发展困扰型、个人管理型、消极事件型压力源得分均高于男生(P<0.05);Pearson相关性分析结果显示,医学生SCL-90得分与压力源得分呈显著正相关(P<0.05)。结论新疆维吾尔自治区某大学有25.26%医学生存在不同程度的心理健康问题,女生心理健康水平不如男生。心理健康水平和压力呈正相关,发展困扰型压力成为医学生主要压力源。不同特征医学生的心理健康水平与压力源存在一定的差异。展开更多
最小二乘逆时偏移(Least-Squares Reverse Time Migration,LSRTM)与常规偏移相比具有更高的成像分辨率、振幅保真性及均衡性等优势,是当前研究的热点之一.震源子波的估计直接影响LSRTM结果的好坏,在实际情况下考虑到震源子波的空变特性...最小二乘逆时偏移(Least-Squares Reverse Time Migration,LSRTM)与常规偏移相比具有更高的成像分辨率、振幅保真性及均衡性等优势,是当前研究的热点之一.震源子波的估计直接影响LSRTM结果的好坏,在实际情况下考虑到震源子波的空变特性,其估计十分困难.为了消除子波对LSRTM结果的影响,本文发展了基于卷积目标泛函的不依赖子波LSRTM算法.目标泛函由观测记录卷积模拟记录的参考道以及模拟记录卷积观测记录的参考道组成,由于观测子波和模拟子波在目标泛函的两项中同时存在,从而消除了子波的影响.此外,常用的基于L2范数拟合的LSRTM算法对噪声非常敏感,尤其是当地震数据中含有异常值时,常规LSRTM无法得到满意的结果.Student′s t分布相比L2范数具有更好的稳健性,本文将其推广到不依赖子波LSRTM中,提升了算法的稳健性,最后通过理论模型及实际资料试算验证了算法的有效性和对复杂模型的适应性.展开更多
文摘This study determined the sources from which Vietnamese high school students currently acquire sexual knowledge as well as the sources from which they believe they should acquire it. Participants were eleventh-grade students at three public high schools in Hanoi, Vietnam. We conducted a questionnaire-based survey from September to October 2012, with 1672 students participating. Responses were received from all 1672 students, a response rate of 100%. Complete data were received from 1653 respondents (98.9%), including 896 males (54.2%) and 757 females (45.8%). The survey was a self-administrated questionnaire. Although many participants believed that they were knowledgeable about sex, only a small number of them actually possessed accurate sexual knowledge. Few participants in this study, targeted to a specific age (eleventh grade), had used the Internet as a major source for obtaining sexual knowledge, in contrast to results from previous studies which covered a wider age demographic. Future research should include comparative studies between eleventh and twelfth graders as well as between those of the same age who are and who are not enrolled in high school. Additionally, it might be beneficial to consider the relationship between adolescent age and Internet use to study the influence of the Internet on sexual knowledge. Our results suggest that parents and schoolteachers should shoulder more responsibility in providing sexual education, particularly by improving their own knowledge and ability to provide such education, because many participants indicated that sexual knowledge should be acquired from parents and schools.
文摘目的了解健康中国背景下新疆某大学医学生心理健康水平和压力源,并分析其影响因素。方法采用分层整群随机抽样法抽取2021年2~4月新疆维吾尔自治区某大学4421名医学生,采用症状自评量表(Symptom Check List 90,SCL-90)和当代大学生压力源量表进行问卷调查。结果25.26%医学生存在不同程度SCL-90量表所列症状;SCL-90各因子分均低于全国部分地区大学生常模(P<0.05);SCL-90量表中躯体化、强迫症状、抑郁和恐怖因子得分女生显著高于男生(P<0.05);主要压力源为发展困扰型;疆外生源学生发展困扰型压力源得分高于疆内生源学生(P<0.05);女生压力高于男生,女生发展困扰型、个人管理型、消极事件型压力源得分均高于男生(P<0.05);Pearson相关性分析结果显示,医学生SCL-90得分与压力源得分呈显著正相关(P<0.05)。结论新疆维吾尔自治区某大学有25.26%医学生存在不同程度的心理健康问题,女生心理健康水平不如男生。心理健康水平和压力呈正相关,发展困扰型压力成为医学生主要压力源。不同特征医学生的心理健康水平与压力源存在一定的差异。
文摘最小二乘逆时偏移(Least-Squares Reverse Time Migration,LSRTM)与常规偏移相比具有更高的成像分辨率、振幅保真性及均衡性等优势,是当前研究的热点之一.震源子波的估计直接影响LSRTM结果的好坏,在实际情况下考虑到震源子波的空变特性,其估计十分困难.为了消除子波对LSRTM结果的影响,本文发展了基于卷积目标泛函的不依赖子波LSRTM算法.目标泛函由观测记录卷积模拟记录的参考道以及模拟记录卷积观测记录的参考道组成,由于观测子波和模拟子波在目标泛函的两项中同时存在,从而消除了子波的影响.此外,常用的基于L2范数拟合的LSRTM算法对噪声非常敏感,尤其是当地震数据中含有异常值时,常规LSRTM无法得到满意的结果.Student′s t分布相比L2范数具有更好的稳健性,本文将其推广到不依赖子波LSRTM中,提升了算法的稳健性,最后通过理论模型及实际资料试算验证了算法的有效性和对复杂模型的适应性.
