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健美操教学对培养高中女生自信心的初探

四川体育科学 2004年第3期23卷 205-207页

作者：施晓云袁一丹华东师范大学体育与健康学院上海200062 上海交通大学体育系上海200030

通过对正在学习健美操课程的高中女生进行问卷调查,了解她们对健美操的爱好程度,观察她们在进行健美操练习的不同状态下自信心的变化情况,对于如何提高高中女生学习健美操的自信心和改进健美操课程,提出可行性的建议。

关键词：健美操教学高中女生自信心体育教学体育锻炼学习兴趣

羧甲基改性沙柳木粉膜吸附Cd^(2.)的性能研究

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化学研究与应用 2024年第6期36卷 1341-1348页

作者：周丽娟刘小凯赵白云贺豪赵轩王晨旭王丽内蒙古农业大学材料科学与艺术设计学院内蒙古自治区沙生灌木资源纤维化和能源化开发利用重点实验室内蒙古呼和浩特010018

沙柳木粉(SPP)经醚化反应制备成羧甲基沙柳木粉(CMS)。将CMS溶解到1-丙烯基-3-甲基咪唑氯盐([AMIM]Cl)和二甲基亚砜(DMSO)中,采用聚乙烯醇(PVA)为成膜剂,制备羧甲基沙柳木粉膜(CMSM)。探究在不同吸附条件下CMSM对Cd^(2.)的吸附性能。采... 详细信息

沙柳木粉(SPP)经醚化反应制备成羧甲基沙柳木粉(CMS)。将CMS溶解到1-丙烯基-3-甲基咪唑氯盐([AMIM]Cl)和二甲基亚砜(DMSO)中,采用聚乙烯醇(PVA)为成膜剂,制备羧甲基沙柳木粉膜(CMSM)。探究在不同吸附条件下CMSM对Cd^(2.)的吸附性能。采用FTIR、SEM、XRD和XPS对CMSM进行表征。吸附结果表明:Cd^(2.)初始浓度为800mg·L^(-1),pH值为5,吸附时间105min,吸附温度35℃时,CMSM对Cd^(2.)的吸附效果最佳。表征结果表明:O-H、-COOH、-C-O-C-、-CH_(2.、-NH_(2.,基团参与吸附Cd^(2.)的反应。CMSM表面比较疏松,有孔隙,成狭缝型。CMSM晶体内部变得蓬松,Cd^(2.)更容易被CMSM吸附。CMSM对Cd^(2.)的吸附属于多分子层吸附,同时存在化学吸附和物理吸附,且以化学吸附为主,准二级动力学模型和Freundlich等温线模型与其吸附过程相符合。

关键词：沙柳木粉羧甲基改性吸附 Cd^(2.)

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基于圆柱体骰子三面概率落地均匀性探究

大学物理 2024年第2期43卷 49-54页

作者：杜王一心柏鹿婧周芸辽宁师范大学物理与电子技术学院辽宁大连116029

传统硬币正反面落地概率分别趋近于1/2.而侧面落地概率几乎为0.本文为了探究新型圆柱形骰子三面落地概率均匀的影响因素,从力学角度对圆柱形骰子发生弹性碰撞和非弹性碰撞的运动过程进行了理论分析,将影响落地概率均匀性的因素分为圆柱... 详细信息

传统硬币正反面落地概率分别趋近于1/2.而侧面落地概率几乎为0.本文为了探究新型圆柱形骰子三面落地概率均匀的影响因素,从力学角度对圆柱形骰子发生弹性碰撞和非弹性碰撞的运动过程进行了理论分析,将影响落地概率均匀性的因素分为圆柱形骰子自身的物理和几何特征以及外部影响因素,通过建立各类圆柱形骰子模型,采用控制变量法进行实验,并应用软件进行仿真模拟,所得实验结论和仿真结论与理论分析吻合.研究表明骰子厚度直径比、接触面材质硬度、抛掷高度及圆柱体重心线与竖直方向向量夹角是影响落地概率均匀性的主要因素.

关键词：弹性碰撞非弹性碰撞控制变量法仿真模拟

Diagnosis,treatment and prevention of severe acute respiratory syndrome coronavirus 2.infection in children:experts'consensus statement updatedforthe Omicron variant

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World Journal of Pediatrics 2024年第3期20卷 272-286页

作者： Rong-Meng Jiang Zheng-De Xie Yi Jiang Xiao-Xia Lu Run-Ming Jin Yue-Jie Zheng yun-Xiao Shang Bao-Ping Xu Zhi-Sheng Liu Gen Lu Ji-Kui Deng Guang-Hua Liu Xiao-Chuan Wang Jian-She Wang Lu-Zhao Feng Wei Liu Yi Zheng Sai-Nan Shu Min Lu Wan-Jun Luo Miao Liu Yu-Xia Cui Le-Ping Ye A-Dong Shen Gang Liu Li-Wei Gao Li-Juan Xiong Yan bai Li-Kai Lin Zhuang Wei Feng-Xia Xue Tian-You Wang Dong-Chi Zhao Jian-Bo Shao Daniel Kwok-keung Ng Gary Wing-kin Wong Zheng-Yan Zhao Xing-Wang Li Yong-Hong Yang Kun-Ling Shen Diagnosis and Treatment Center of Infectious Diseases Beijing Ditan HospitalCapital Medical UniversityBeijing 100015China Beijing Key Laboratory of Pediatric Respiratory Infection Diseases Key Laboratory of Major Diseases in ChildrenMinistry of EducationNational Clinical Research Center for Respiratory DiseasesResearch Unit of Critical Infection in ChildrenChinese Academy of Medical Sciences2019RU016Laboratory of Infection and VirologyBeijing Pediatric Research InstituteBeijing Children's HospitalCapital Medical UniversityNational Center for Children's HealthBeijing 100045China Department of Pediatrics Renmin Hospital of Wuhan UniversityWuhan 430060China Department of Respiratory Wuhan Children's HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430016China Department of Pediatrics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China Department of Respiratory Shenzhen Children's HospitalShenzhen 518038China Department of Pediatric Respiratory Shengjing Hospital Affiliated to China Medical UniversityShenyang 110004China Department of Respiratory Beijing Children's HospitalCapital Medical UniversityNational Clinical Research Center for Respiratory DiseasesNational Center for Children's HealthBeijing 100045China Department of Neurology Wuhan Children's HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430016China Department of Respiratory Guangzhou Women and Children's Medical CenterGuangzhou 510623China Department of Infectious Diseases Shenzhen Children's HospitalShenzhen 518038China Department of Pediatrics Fujian Branch of Shanghai Children's Medical CenterFujian Children's HospitalFuzhou350005China Department of Clinical Immunology and Allergy Children's Hospital of Fudan UniversityNational Center for Children's HealthShanghai 201102China Department of Infectious Diseases Children's Hospital of Fudan UniversityNational Center for Children's Health.Shanghai

It has been more than 3 years since the novel coronavirus(SARS-CoV-2.pandemic raged *** coronavirus disease 2.19(COVID-19)has greatly influenced human *** to data from the World Health Organization(WHO),there were ove... 详细信息

关键词： prevention infection statement

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CAPP开发工具的研究与应用

天津轻工业学院学报 2002年第3期17卷 47-50页

作者：贾树柏管宝云天津科技大学机械工程学院天津300222

通过对现有 CAPP系统工作原理的分析和抽象 ,建立了统一的、开放的 CAPP体系结构 ,研制了 CAPP开发工具 ;同时 ,介绍了

关键词：开发工具 CAPP系统结构设计 TFCAPPTS系统

Characteristics of secondary electron emission from few layer graphene on silicon(111) surface

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Chinese Physics B 2022年第10期31卷 549-562页

作者： Guo-Bao Feng yun Li Xiao-Jun Li Gui-bai Xie Lu Liu National Key Laboratory of science and technology on Space Microwave China Academy of Space TechnologyXi’an 710100China School of Computer science and Engineering Xi’an University of TechnologyXi’an 710048China

As a typical two-dimensional(2.) coating material, graphene has been utilized to effectively reduce secondary electron emission from the surface. Nevertheless, the microscopic mechanism and the dominant factor of secondary electron emission suppression remain controversial. Since traditional models rely on the data of experimental bulk properties which are scarcely appropriate to the 2. coating situation, this paper presents the first-principles-based numerical calculations of the electron interaction and emission process for monolayer and multilayer graphene on silicon(111) substrate. By using the anisotropic energy loss for the coating graphene, the electron transport process can be described more realistically. The real physical electron interactions, including the elastic scattering of electron-nucleus, inelastic scattering of the electron-extranuclear electron, and electron-phonon effect, are considered and calculated by using the Monte Carlo method. The energy level transition theory-based first-principles method and the full Penn algorithm are used to calculate the energy loss function during the inelastic scattering. Variations of the energy loss function and interface electron density differences for 1 to 4 layer graphene coating Go Si are calculated, and their inner electron distributions and secondary electron emissions are analyzed. Simulation results demonstrate that the dominant factor of the inhibiting of secondary electron yield(SEY) of Go Si is to induce the deeper electrons in the internal scattering process. In contrast, a low surface potential barrier due to the positive deviation of electron density difference at monolayer Go Si interface in turn weakens the suppression of secondary electron emission of the graphene layer. Only when the graphene layer number is 3, does the contribution of surface work function to the secondary electron emission suppression appear to be slightly positive.

关键词： secondary electron emission graphene on silicon numerical simulation

Response of carbohydrate metabolism-mediated sink strength to auxin in shoot tips of apple plants

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Journal of Integrative Agriculture 2022年第2期21卷 422-433页

作者： SU Jing CUI Wei-fang ZHU Ling-cheng LI bai-yun MA Feng-wang LI Ming-jun State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple/college of Horticulture Northwest A&F UniversityYangling 712100P.R.China

Auxin(indole-3-acetic acid, IAA) has a considerable impact on the regulation of plant carbohydrate levels and growth, but the mechanism by which it regulates sugar levels in plants has received little attention. In this study, we found that exogenous IAA altered fructose(Fru), glucose(Glc), and sucrose(Suc) concentrations in shoot tips mainly by regulating MdSUSY1, MdFRK2. MdHxK1 and MdSDH2.transcript levels. Additionally, we used 5-year-old ’Royal Gala’ apple trees to further verify that these genes play primary roles in regulating sink strength. The results showed that MdSUSY1, MdFRK2. MdHxK1/3 and MdSDH2.might be major contributors to sink strength regulation. Taken together, these results provide new insight into the regulation of the carbohydrate metabolism mechanism, which will be helpful for regulating sink strength and yield.

关键词： apple exogenous IAA carbohydrate metabolism sink strength shoot tips

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气排球与室内排球技术的比较分析

体育科学研究 2008年第3期12卷 55-56页

作者：姚鲆王幼华白群连道明连瑞华福建师范大学体育科学学院福建福州350007 集美大学体育学院福建厦门361021

通过文献资料和比较分析等方法,对气排球与室内排球的技术进行比较和分析,发现两者间存在一定程度的差别:气排球的技术源于室内排球,但具有一定的独特性和随意性;室内排球的技术经过多年的演变和改进比较成熟和稳定。建议对气排球技术... 详细信息

通过文献资料和比较分析等方法,对气排球与室内排球的技术进行比较和分析,发现两者间存在一定程度的差别:气排球的技术源于室内排球,但具有一定的独特性和随意性;室内排球的技术经过多年的演变和改进比较成熟和稳定。建议对气排球技术在保持其项目特点的基础上参照室内排球进一步创新和完善,以促进该项运动更好地推广和普及。

关键词：气排球室内排球技术

Urgent Need for Contraceptive Education and Services in Chinese Unmarried Undergraduates:A Multi-campus Survey

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Journal of Huazhong University of science and technology(Medical sciences) 2011年第4期31卷 426-432页

作者：周远忠熊锦文李洁黄诗韵商学军刘国辉张玫玫尹平魏晟熊承良 Institute of Family Planning Tongji Medical CollegeHuazhong University of Science and Technology School of Public Health Zunyi Medical College Department of O&G Hubei Provincial Corps HospitalChinese People's Armed Police Forces Reproductive Medical Center Renmin Hospital of Wuhan University Department of Andrology Nanjing General Hospital of Nanjing Military Region Institute for Population and Family Planning of Chongqing City Sexual Health Education Research Center Capital Normal University Department of Epidemiology School of Public HealthTongji Medical CollegeHuazhong University of Science and Technology

In order to ascertain prevalence rate of premarital sexual intercourse,unintended pregnancy and abortion,and evaluate associated factors of unintended pregnancy among undergraduates from all over china,the representative sample of unmarried undergraduates was obtained by using a multi-stage,stratified,probability cluster design,and data were collected by using a survey questionnaire.62.32. available responders were gained.11.6% of them acknowledged having experiences of premarital sexual intercourse（standardized prevalence rate of sexual intercourse was 13.8%）.31.5% of students active in premarital sex acknowledged undergoing unintended pregnancy.76.2. of pregnant students selected abortion to end *** students active in premarital sex,46.2. used contraception at the first sexual intercourse,2..2. replied ＂always＂ using contraception in sexual *** rate of using condoms,oral contraceptives（OCs）,and withdrawal among students who had used contraception was 52.0%,31.0%,and 2..2. respectively.＂No preparation for sex＂（40.3%）,＂pleasure decrement＂（32.1%）,＂won＇t-be-pregnancy in occasional sexual intercourse＂（30.2.） were their common excuses for using no *** identified risk factors for unintended pregnancy among students active in premarital sex by multivariate analysis were as follows：having no steady lover [having no steady lover vs having a steady lover：odds ratio（OR）,1.875;95% confidence interval（CI）,1.62.-2.158],unaware of the course of conception（unaware vs aware：OR,2.02.;95% CI,1.811-2.2.0）,considering abortion not endanger women＇s physical and mental health（no endangerment vs endangerment：OR,2.659;95% CI,2.2.5-3.12.）,nonuse of contraception（never use vs always use：OR,1.682.95% CI,1.2.5-2.185）.Medical students were not less likely to experience an unintended pregnancy than nonmedical students（OR,1.111;95% CI,0.906-1.2.7）.The substantial proportion of unintended pregnancy among undergraduates indicates a need for convenient and targeted contra

关键词： students unsafe sex contraception unplanned pregnancy china