期刊文献+
共找到2,830篇文章
< 1 2 142 >
每页显示 20 50 100
Asymptotic distributions of non-central studentized statistics
1
作者 SHAO QiMan ZHANG RongMao 《Science China Mathematics》 SCIE 2009年第6期1262-1284,共23页
Let X 1, ..., X n be independent and identically distributed random variables and W n = W n (X 1, ..., X n ) be an estimator of parameter ?. Denote T n = (W n ? ? 0)/s n , where s n 2 is a variance estimator of W n . ... Let X 1, ..., X n be independent and identically distributed random variables and W n = W n (X 1, ..., X n ) be an estimator of parameter ?. Denote T n = (W n ? ? 0)/s n , where s n 2 is a variance estimator of W n . In this paper a general result on the limiting distributions of the non-central studentized statistic T n is given. Especially, when s n 2 is the jacknife estimate of variance, it is shown that the limit could be normal, a weighted χ 2 distribution, a stable distribution, or a mixture of normal and stable distribution. Applications to the power of the studentized U- and L- tests are also discussed. 展开更多
关键词 non-central studentized statistics studentized U-statistics studentized L-statistics limiting distributions power of tests 62E20 62F05 60F05
原文传递
Posttraumatic stress symptoms among Chinese university students during the COVID-19 pandemic:Prevalence,correlates,and mental health help-seeking
2
作者 Rui-Yao Wu Lin-Feng Ge Bao-Liang Zhong 《World Journal of Psychiatry》 SCIE 2025年第1期145-152,共8页
BACKGROUND Revisiting the epidemiology of posttraumatic stress symptoms(PTSSs)among university students during the coronavirus disease 2019(COVID-19)pandemic as well as understanding the mental health help-seeking beh... BACKGROUND Revisiting the epidemiology of posttraumatic stress symptoms(PTSSs)among university students during the coronavirus disease 2019(COVID-19)pandemic as well as understanding the mental health help-seeking behavior of individuals with PTSSs has critical implications for public mental health strategies in future medical pandemics.AIM To investigate the prevalence and correlates of PTSSs among university students during the first wave of the COVID-19 pandemic in China and to examine mental health help-seeking behaviors among these students.METHODS A total of 2507 Chinese university students were recruited via snowball sampling.The students completed the Seven-item Screening Scale for Post-traumatic Stress Disorder during the first wave of the COVID-19 pandemic in China.Sociodemo-graphic characteristics,pandemic-related characteristics,and mental health help-seeking behaviors of students with PTSSs were also collected.RESULTS The prevalence of PTSSs among the participants was 28.0%.Seven significant correlates of PTSSs were identified(odds ratio=1.23-3.65,P≤0.024):Female sex,being 19 years old or older,living with others or alone,a low level of family economic status,fair or poor interpersonal relationships,severe or very severe local pandemic,and having family members diagnosed with COVID-19.However,only 3.28%of the students with PTSSs reported seeking help from mental health specialists.Among the 23 students who sought help from mental health specialists,13 opted for online or telephone-based psychological consultation.CONCLUSION Our data suggest that there was a high risk of PTSSs among university students and a high level of unmet mental health needs during the COVID-19 pandemic.The delivery of mental health services online or via telephone is a promising approach to address these unmet needs. 展开更多
关键词 Posttraumatic stress symptoms University students COVID-19 Mental health help-seeking China
暂未订购
物理信息Student’s t混合模型在混油长度预测中的应用
3
作者 贾子寒 《油气储运》 北大核心 2025年第10期1200-1200,共1页
多油品管道在石油炼制产品的运输中具有可靠、经济等优势,然而在顺序输送过程中,不同油品在接触界面处会发生混合,形成混油段。若混油长度控制不当,将导致油品污染、质量下降,甚至造成巨大的经济损失。因此,精确预测混油长度对于优化切... 多油品管道在石油炼制产品的运输中具有可靠、经济等优势,然而在顺序输送过程中,不同油品在接触界面处会发生混合,形成混油段。若混油长度控制不当,将导致油品污染、质量下降,甚至造成巨大的经济损失。因此,精确预测混油长度对于优化切割操作、保障油品质量、提高管道运行效率具有重要意义。 展开更多
关键词 多油品管道 Students t混合模型 混油长度
原文传递
Edgeworth expansion of the Studentized product-limit estimator for truncated and censored data
4
作者 孙六全 《Science China Mathematics》 SCIE 2000年第5期495-508,共14页
Based on random left truncated and right censored data we investigate the one-term Edgeworth expansion for the Studentized product-limit estimator, and show that the Edgeworth expansion is close to the exact distribut... Based on random left truncated and right censored data we investigate the one-term Edgeworth expansion for the Studentized product-limit estimator, and show that the Edgeworth expansion is close to the exact distribution of the Studentized product-limit estimator with a remainder of On(su-1/2). 展开更多
关键词 TRUNCATED and censored data studentized product-limit ESTIMATOR ASYMPTOTIC NORMALITY Edge- WORTH expansion.
原文传递
The Berry-Esseen bound for studentized U-statistics
5
作者 林正炎 《Science China Mathematics》 SCIE 2000年第11期1154-1163,共10页
We establish the Berry-Esseen bound O(n-δ#2) for a studentized U-statistic under the assumption of existence of the (2 + δ)-th moment.
关键词 studentized U-STATISTICS Berry-Esseen bound.
原文传递
Think Like an Engineer!
6
作者 James A.Brown 《The Canadian Journal of Urology》 2025年第4期237-237,共1页
I had an epiphany last month.I realized that all the teaching I’ve provided to residents and students the past three decades could be distilled into a single,germane suggestion:“Think Like an Engineer!”
关键词 EPIPHANY residents students STUDENTS TEACHING RESIDENTS engineering
暂未订购
Encouraging Environmental Sensitivity and Earth Science Performance:Perceptions from First-Year Teacher Education Students
7
作者 Aldrex A.Barrientos 《Journal of Environmental & Earth Sciences》 2025年第4期180-192,共13页
This study explores the environmental sensitivity of first-year teacher education stu dents,focusing on the relationship between their Earth Science performance,demographic factors,and their cognitive and emotional re... This study explores the environmental sensitivity of first-year teacher education stu dents,focusing on the relationship between their Earth Science performance,demographic factors,and their cognitive and emotional responses to environmental challenges.Using a descriptive correlational design within a mixed-methods framework,the research incorporates tools such as the Environmental Sensitivity Test(EST),focus group discussions(FGDs),and eco-mapping to comprehensively collect and analyze data.The findings reveal that while students exhibit a general awareness of environmental issues,this awareness does not consistently translate into sustainable practices,particularly in areas such as water conservation and waste management.A weak and statistically insignificant correlation was identified between Earth Science performance and environmental sensitivity,indicating that academic achievement in the subject does not necessarily lead to environmentally responsible behaviors.The results underscore the importance of teacher education programs integrating principles of behavioral psychology,experiential learning,and focused environmental education.Specifically,secondary science teachers should be equipped with practical strategies,such as implementing project-based learning,organizing community-centered environmental initiatives,and fostering interdisciplinary approaches to sustainability.These interventions address the gap in preparing future educators to effectively advocate for and implement sustainable practices.Strengthening teacher preparation programs with these components ensures that science educators are better equipped to cultivate a new generation of environmentally responsible citizens. 展开更多
关键词 Environmental Sensitivity Earth Science PERFORMANCE PERCEPTION First-Year Students Teacher Education Students
在线阅读 下载PDF
Returning the Lost Wallet
8
作者 李文平 《中学生英语》 2025年第26期6-6,共1页
Last Monday,on my way to school,I found a wallet on the ground.I picked up it①and opened it.There was some money,a student ID card and a few photos in it.I thought the owner must be very worried.
关键词 PHOTOS student ID card student id card lost wallet MONEY
在线阅读 下载PDF
Application of Modified Peyton’s Four-Step Teaching Method in Bridge Experimental Courses for Undergraduate Medical Students
9
作者 Hongmei Xu Xuejing Wang 《Journal of Contemporary Educational Research》 2025年第8期105-110,共6页
Objective:To explore the application value of the modified Peyton’s four-step teaching method in bridge experimental courses for undergraduate medical students.Methods:100 undergraduate medical students from Bethune ... Objective:To explore the application value of the modified Peyton’s four-step teaching method in bridge experimental courses for undergraduate medical students.Methods:100 undergraduate medical students from Bethune Hospital of Shanxi from July 2023 to July 2024 were selected and grouped using a random number method.The control group received a conventional training program,while the observation group received a modified Peyton’s four-step teaching and training program.The DOPS scores and teaching satisfaction scores of the two groups of undergraduate medical students were compared.Results:After intervention,the scores of each dimension of the DOPS for the undergraduate medical students in the observation group were higher than those in the control group.The teaching satisfaction scores of the undergraduate medical students after teaching were lower in the control group than in the observation group.The differences between the two groups were statistically significant(P<0.05).Conclusion:The modified Peyton’s four-step teaching program developed in this study can promote teaching and learning methods for undergraduate medical students,improve teaching satisfaction levels,and help administrators stabilize the medical team. 展开更多
关键词 Undergraduate medical students SATISFACTION UNDERGRADUATE Medical students
在线阅读 下载PDF
Six Elements That Help Create a Friendly Environment and Motivate Learning
10
作者 Roberto Cuccu 《Sino-US English Teaching》 2025年第1期1-6,共6页
The following sections of this article are the background of the experiences described in the book Creative Journals in a Bottle.Out-of-the-Box Activities That Help Teenagers Become Sensitive and Self-Confident Adults... The following sections of this article are the background of the experiences described in the book Creative Journals in a Bottle.Out-of-the-Box Activities That Help Teenagers Become Sensitive and Self-Confident Adults(Cuccu,2024).Being a teacher in a classroom of young people involves more than just being able to tell them about a topic they have to study,they are also educators and play an important role in their development in a critical period of their lives.The following sections deal with things to do and not to do in order to create an ideal environment characterized by empathy,motivation,and learning together. 展开更多
关键词 Neuro-Linguistic Programming different views of a situation Cooperative Learning dealing with students learning styles students’interests role of empathy
在线阅读 下载PDF
Teacher-student relationship quality effects on school students’bullying victimization:A serial mediation model by student-student relationship and student engagement
11
作者 Yuan Yuan Yanfei Yang 《Journal of Psychology in Africa》 2025年第4期541-548,共8页
This study examined the impact of teacher-student relationship quality on students’risk of bullying victimiza-tion and the mediating roles of student-student relationships and student engagement in this relationship.... This study examined the impact of teacher-student relationship quality on students’risk of bullying victimiza-tion and the mediating roles of student-student relationships and student engagement in this relationship.A total of 656 Chinese junior high school students(females=361,mean age=13.75,SD=0.98)completed validated measures of teacher-student relationship quality,student-student relationship quality,student engagement,and bullying victimization.Regression analysis results indicated that higher teacher-student relationship quality predicted a lower risk of student bullying victimization.Serial mediating effect testing of the student-student relationship quality and student engagement revealed that these factors fully mediated the relationship between teacher-student relationship quality and bullying victimization,resulting in a lower risk of bullying victimization.The results showed that student-student relationship quality had a more substantial mediating effect than student engagement.Thefindings support the Socio-Ecological Framework,suggesting that within the Microsystem,interactions between individuals and their immediate environments significantly impact their behavior.Specifically,thesefindings suggest that good teacher-student relationships can enhance the quality of student-student relationships and student engagement,thereby preventing and reducing the occurrence of bullying victimization. 展开更多
关键词 teacher-student relationship quality bullying victimization student-student relationship quality student engagement junior middle school students
在线阅读 下载PDF
Welcome to Changsha
12
作者 邱诗怡 李兰(指导) 《疯狂英语(双语世界)》 2025年第1期72-74,共3页
Hello,my name is Jesse.I am a student in Class 3,Grade 6,Xiqiao Experimental Primary School.My hometown is in Changsha,Hunan.I love this land.Do you want to learn about this interesting place?Let me be a little guide ... Hello,my name is Jesse.I am a student in Class 3,Grade 6,Xiqiao Experimental Primary School.My hometown is in Changsha,Hunan.I love this land.Do you want to learn about this interesting place?Let me be a little guide of my hometown,and I’ll tell you. 展开更多
关键词 HOMETOWN GUIDE HUNAN Changsha STUDENT
在线阅读 下载PDF
解应用题
13
作者 黄炜乐 《疯狂英语(双语世界)》 2025年第1期41-43,66,共4页
(1)A class has 36 students.There are 10 more boys than girls.How many girls are there?一个班有36人。男生比女生多10人。女生有多少人?
关键词 STUDENTS BOYS GIRLS CLASS
在线阅读 下载PDF
What do nursing students know about delirium?A cross-sectional study and scenario analysis
14
作者 Rana A.Al-Awamleh Ibrahim Ayasreh +5 位作者 Omar Khraisat Jafar M.Alkhawaldeh Haitham Khatatbeh Nisser Alhroub Manar Abu-abbas Ahmad Salameh Al-Awamleh 《Frontiers of Nursing》 2025年第3期401-407,共7页
Objective:To assess the level of nursing students’knowledge about delirium and its associated risk factors.Delirium is a clinical syndrome characterized by alterations in cognition and psychomotor activity.Since deli... Objective:To assess the level of nursing students’knowledge about delirium and its associated risk factors.Delirium is a clinical syndrome characterized by alterations in cognition and psychomotor activity.Since delirium is common among geriatric patients,adequate preparedness of nursing students to assess and manage delirious geriatric patients is necessary to improve potential nurses’quality of care and communication with this group.Limited research work was conducted to address nursing students’knowledge about delirium.Methods:This cross-sectional descriptive study was conducted from October 2022 to February 2023.A convenience sampling was used,and 319 valid questionnaires were obtained from nursing students from six Jordanian governmental and private universities,who were at least in their third academic year.An adopted delirium knowledge scale was used to collect data.Descriptive statistics and an independent t-test were used for data analysis.Results:The mean for general knowledge about delirium was 57.5%.The mean for knowledge of delirium risk factors was 61.8%.Nursing students in their fourth academic year scored significantly higher on both general knowledge and risk knowledge scales than students in the third academic year.Conclusions:Nursing students’knowledge regarding delirium and its risk factors was low.Educational efforts should be maximized for incorporating and addressing the topic of delirium in the undergraduate nursing curriculum.Implications of this study include revising nursing curricula to ensure that students receive enough education on delirium,including its detection,diagnosis,and management.The implications also include giving nursing students the chance to gain experience in caring for delirious patients and providing them with the tools and resources they need to assess and manage delirium. 展开更多
关键词 DELIRIUM JORDAN KNOWLEDGE nursing students risk factors
在线阅读 下载PDF
Investigation and Strategy Research on the Causes of Middle School Students’Learning Difficulties in the Context of the Leading Country in Education
15
作者 Jun-Jie Yan Xiao-Nan Luo +2 位作者 Qun-Fang Zeng Hui-Lin Zhang Jian-Nan Wu 《教育技术与创新》 2025年第2期1-10,共10页
The purpose of this research is to analyze the causal mechanisms of learning difficulties of middle school students and use them to propose strategies to help them.This research is particularly valuable for its focus ... The purpose of this research is to analyze the causal mechanisms of learning difficulties of middle school students and use them to propose strategies to help them.This research is particularly valuable for its focus on middle school students.Research on this critical transition period is often lacking compared to primary and high school.Therefore,this research establishes a structured equation model and analyzes the data from the survey using the partial least squares method.The data were obtained from a 13,900 Wenzhou City,China students’questionnaire.The research found that learning strategies were the most significant influences on learning effectiveness,followed by learning motivation and learning relationships.Meanwhile,learning relationships had a significant impact on learning pressure.Therefore,this research proposes targeted support strategies.It aims to enhance learning motivation(Set achievable learning goals for each student with learning difficulties based on their actual situation),optimize learning strategies(Encourage students with learning difficulties to learn self-regulatory strategies such as goal setting,time management,and self-reflection),and improve learning relationships(Establish a good social network to promote positive interaction between students with learning difficulties and their peers).At the same time,it reduces students’learning pressure.Ultimately,the learning effectiveness of students with learning difficulties is improved. 展开更多
关键词 support strategies leading country in education students with learning difficulties middle school students
在线阅读 下载PDF
Attitudes,and barriers towards organ donation among university students,faculty and staff in Ajman,United Arab Emirates:Crosssectional survey design
16
作者 Shatha Al-Sharbatti Selva Titus Chacko +1 位作者 Vimala Varatharajan Soney Melath Varghese 《World Journal of Transplantation》 2025年第4期356-366,共11页
BACKGROUNDLimited research exists on attitudes and barriers to organ donation in the UnitedArab Emirates, highlighting the need for a deeper understanding of public perceptionsand challenges.AIMTo assess the attitudes... BACKGROUNDLimited research exists on attitudes and barriers to organ donation in the UnitedArab Emirates, highlighting the need for a deeper understanding of public perceptionsand challenges.AIMTo assess the attitudes and barriers toward organ donation.METHODSA cross-sectional study was adopted and included 607 samples consisting ofstudents, faculty, and staff who were selected from three universities in Ajmanand who had signed consent forms. A validated self-administered questionnairethat included 13 attitudes and 14 barrier items was used as a tool. The reliabilityof the tool was 0.89 (Cronbach's alpha). In the analysis of attitude scores, responseswere rated on a scale from 0 to 4, with 0 representing 'strongly disagree'and 4 representing 'strongly agree' for supportive attitudes towards organdonation. Participants with a total attitude score of 39 or higher indicated agreementor strong agreement with all items, reflecting a generally supportiveattitude toward organ donation. Lower scores suggested that the respondent wasneutral or disagreed with one or more items, indicating a less supportive attitudetoward organ donation. Knowledge about organ donation was assessed by selfadministeredquestionnaire that included 13 items. Analysis was done using SPSSversion 29. χ2 was used to assess associations between variables.RESULTSMost participants were young (≤ 30 years old, 83.7%), female (79.2%), from World Health Organization Eastern Mediterranean Region countries (69.5%), Muslim (82.4%), students (80.6%), single(83.9%), and from a nursing college (33.1%). The majority had no personal or family history of organ donation(93.2% and 93.9%, respectively). Supportive attitudes toward organ donation were significantly associated withreligion (P = 0.003), working status (P = 0.009), university (P = 0.019), and knowledge (P < 0.001). Additionally,those with a personal or family history of organ donation were significantly more supportive (56.8% vs 33.3%, P =0.004). Lack of awareness was the most reported barrier for organ donation (64.1%) followed by being afraid oforgan donation due to medical procedures required (51.9%).CONCLUSIONThe findings suggest that supportive attitudes toward organ donation are influenced by demographic factors,personal experiences, and knowledge levels. Lack of awareness and fear of medical procedures were the mostreported barriers to organ donation. These results highlight the need for targeted educational programs to increaseawareness and promote positive attitudes toward organ donation. 展开更多
关键词 Organ donation Barriers ATTITUDE University students EMPLOYEES
暂未订购
Nursing students’experiences with improving cultural competence through education and practices in rural Indonesia:a qualitative study
17
作者 Petrus Kanisius Siga Tage Fepyani Thresna Feoh +3 位作者 Maria Yasintha Goa Angela Muryanti Gatum Herliana Monika Azi Djogo Erna Febriyanti 《Frontiers of Nursing》 2025年第1期37-46,共10页
Objective: The importance of culture in nursing lies in its influence on patients’ health perceptions, behaviors, and responses to care. Despite the challenges posed by the complexity of studying culture, there remai... Objective: The importance of culture in nursing lies in its influence on patients’ health perceptions, behaviors, and responses to care. Despite the challenges posed by the complexity of studying culture, there remains a critical need to develop cultural competence in nursing. This study investigated how nursing students in rural Indonesia enhance their cultural competence through education and practice. Methods: This study employed a qualitative descriptive phenomenological approach. It conducted face-to-face interviews with 32 students across 6 regions, selected purposively. Thematic analysis was employed to evaluate the results. Results: Five themes emerge in this research: perceptions of cultural competence, learning cultural competence in the classroom, practical experience, learning expectations related to cultural competence, and cultural learning barriers. Conclusions: Enhancing cultural competence necessitates enriched curricula, adept clinical mentors, and continual student evaluation. This iterative assessment informs tailored strategies for nurturing cultural proficiency. 展开更多
关键词 cultural competency EDUCATION Indonesia nursing students PRACTICE qualitative research RURAL
在线阅读 下载PDF
Preliminary Efficacy of an Immersive Virtual Reality Meditation Intervention in Reducing Perceived Stress and Anxiety among University Students
18
作者 Jaehyun Kim Junhyoung Kim +2 位作者 Chungsup Lee Marcos Ardon Lobos Na Young Kim 《International Journal of Mental Health Promotion》 2025年第8期1087-1099,共13页
Background:While traditional meditation practices are known for their mental health benefits,they often face limitations such as restricted access and environmental distractions.To address these challenges and enhance... Background:While traditional meditation practices are known for their mental health benefits,they often face limitations such as restricted access and environmental distractions.To address these challenges and enhance meditation effectiveness,this study implemented an immersive virtual reality meditation(IVRM)program and examined its potentialmental health benefits among university students-a population that frequently experiences significant psychological distress.Methods:Nineteen university students participated in eight 15-min sessions of an IVRM program designed to promote mindfulness and relaxation over the course of one month.Perceived stress and anxiety levels were assessed using validated self-report measures at baseline(T1)and post-intervention(T2).Twotailed paired t-tests were conducted to evaluate the preliminary efficacy of the program,and effect sizes were reported using Cohen’s d.Results:Significant reductions were observed from pre-to post-intervention in perceived stress(t(18)=3.694,p<0.001,SE=0.17,d=−0.85)and perceived anxiety(t(18)=5.113,p<0.01,SE=0.10,d=−1.20),both indicating large effect sizes.Conclusion:Our findings provide preliminary evidence that the IVRMprogramcan reduce stress and anxiety levels in university students.The positive results suggest that IVRM has the potential to serve as a novel,technology-based meditation intervention for individuals at elevated risk for developingmental health disorders.Furthermore,our study suggests important implications for future research. 展开更多
关键词 Virtual reality MINDFULNESS college students stress mental health
暂未订购
Hypertension in College Students: Exploring the Prevalence and Risk Factors
19
作者 Tabbetha Lopez Laura Shelby +2 位作者 Yemisi Oguntuwase Anna Sullivan Linda Fergus 《Food and Nutrition Sciences》 2025年第2期187-208,共22页
Early onset of hypertension (HTN) raises the risk of cardiovascular disease (CVD), the leading cause of death in the U.S. For university students who do not follow healthy diets or lifestyles, high blood pressure (BP)... Early onset of hypertension (HTN) raises the risk of cardiovascular disease (CVD), the leading cause of death in the U.S. For university students who do not follow healthy diets or lifestyles, high blood pressure (BP) may be markedly prevalent. Researchers utilized a cross-sectional design to assess HTN prevalence and its risk factors among college students (N = 123). Self-administered surveys comprising four validated questionnaires: the Perceived Stress Scale (PSS), Rapid Eating Assessment for Participants-Shortened (REAPS), Dietary Approaches to Stop Hypertension Quality (DASH-Q), and the U.S. Adult Food Security Survey (FSS) were employed. Additionally, physical measurements were conducted, including height, weight, waist circumference (WC), and BP. Results indicated that 71.6% of students had elevated BP, with 24.4% classified as Stage 1 HTN and 23.6% as Stage 2 HTN. Notably, 60% of students reported low adherence to the DASH diet and a mean REAPS score of 26.3 out of 39. Students experiencing marginal food security had higher systolic blood pressure (SBP) 131.7 ± 16.8 mm Hg compared to those with high food security 123.03 ± 11.7 mm Hg (p = 0.028). Furthermore, REAPS scores showed a negative correlation with diastolic blood pressure (DBP) (β = −0.201, p = 0.03). Significant predictors for SBP included WC (β = 0.40, p β = −0.33, p β = 0.16, p = 0.046). The findings highlight the need for BP screenings and nutrition education programs to improve dietary habits among college students, which may help reduce HTN and its associated long-term risks for CVD. 展开更多
关键词 HYPERTENSION College Students PREVALENCE Cardiovascular Disease Risk Factors
暂未订购
上一页 1 2 142 下一页 到第
使用帮助 返回顶部