6 research outputs found

    The Study on Biogenic Silica in the Sediments of the Western Arctic Ocean

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    硅是生物地球化学循环中的重要元素,是硅藻、放射虫和海绵骨针等海洋浮游生物生长所必需的营养元素。生源硅(简写为BSi)主要来源于硅藻等生物,生源硅的积累反映上层水体中海洋生产力的时空变化,是古生产力和古气候研究的重要工具。对生源硅的生成、迁移、埋藏的研究有助于系统了解整个海洋环境中的硅循环,并借以进一步认识全球海洋碳循环。 化学提取法是目前应用最广泛、最灵敏的生源硅提取方法,但不同研究者所采用的提取条件有所不同。本研究通过正交试验法,探讨不同因素对生源硅含量测定的影响,优选出适合北极海洋沉积物中生源硅测定的实验条件。通过正交实验法,确定各因素对生源硅提取效率的影响程度从高到低依次为: 提取浓...Silicon plays an important part in biogeochemistry cycle, and it is an essential element required for the growth of diatoms, which represent a major portion of planktonic primary producers. Biogenic silica (BSi) is a sort of amorphous silica from diatom、radiolarians、sponges and other siliceous organisms. BSi may reflect the spatial and temporal distribution of primary productivity an...学位:理学硕士院系专业:海洋与环境学院海洋学系_海洋化学学号:2242007115080

    美国高校心理健康教育工作特点及启示

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    美国高校重视学生心理健康教育工作,其工作队伍有严格的准入条件和专业化的发展路径,服务内容丰富,重视效果评估,建立了心理危机预警的全员机制。我们可以从专业教师的发展、为大学生提供多样化服务、完善心理危机预防干预机制等方面,借鉴美国高校心理健康教育的经验,提高我国高校心理健康教育工作水平。但是我国高校的心理健康教育发展历程、大学生的心理发展状况都有异于美国,要重视心理健康教育本土化,建立适合我国高校的心理健康教育工作模式

    我国大学生心理求助的研究现状及教育对策

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    大学生正处在心理的第二次“断乳期”,心理问题出现频繁但是缺乏相对独立的处理能力,不少需要心理援助甚至处于心理危机状况下的大学生,并不愿意主动寻求帮助,为此,其心理健康状况一直受到社会和学术界的关注,如何帮助大学生有效处理心理困惑、应对心理危机、增强心理健康素质,成为当前高校教育工作者面临的急迫课题。厦门大学妇女胜别研究与培训基地专项课题(2016-FXN008

    导师育人功能对“95后”研究生心理健康教育工作的作用

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    近年来,随着研究生扩招,这个群体在压力陡增,不仅仅体现在学业、就业上,因身心问题引发的研究生自杀、自残事件引起社会强烈的关注。研究生的心理健康教育工作是目前高校工作相对薄弱的环节,如何根据研究生的心理发展特点做好心理健康教育工作,努力提高研究生心理教育、思政教育实效性,促进研究生的全面发展,显得尤为重要。本文通过对研究生心理发展特点、研究生心理健康工作的难度的梳理,思考研究生心理健康教育工作的新视角,挖掘导师的育人功能提供现实可行的方式。1研究生心理发展特点及发展任务1.1研究生心理发展阶段和发展特点:从心理发展阶段

    Investigation of College Career Support Utilization for Graduates

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    通过调查大学毕业生对高校生涯支持的利用情况,得出以下结论:(1)大学毕业生对高校生涯支持利用主要为信息支持,其次为技能支持。信息支持、技能支持的得分显著高于情感支持和物质支持。(2)获取生涯支持频率在人口学变量上存在着显著差异。信息支持维度上,文科生寻求支持频率显著高于理科生,硕士毕业生高于本科毕业生;情感支持维度,男生高于女生。(3)大学生对高校生涯支持的有效性评价较高,且生涯支持的有效性与生涯支持频率存在较大相关。根据调查结论,对高校生涯教育工作及生涯支持方式提出建议。Based on the survey of graduates' utilization of college career support from university,the following conclusions were made:(1)College career support was mainly reflected on the dimensions of information support and skill support.The scores of information support and skills support were significantly higher than emotion support and financial support.(2)The frequencies of college career support had difference in demographic variables.On the dimension of information support,liberal arts students sought support more frequently than science students.And master students sought support more frequently than undergraduates.On the dimension of emotion support,males sought support more frequently the females.(3)The majority of college career support had effective on students' career development,and the effects were related to the frequencies.According to the findings,some suggestions on universities' career education and support were made.厦门大学学生工作研究课题重点课题项目“高校就业指导与生涯教育现状调查及其对大学生职业决策的影响研究——基于SCCT理论”(2013XNZD005

    Optimization of the Extractive Conditions of the Biogenic Silica from the Sediment in the Arctic Ocean with Orthogonal Experiment

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    生源硅主要来源于硅藻等生物,生源硅的积累反映上层水体中海洋生产力的时空变化,是古生产力和古气候研究的重要工具.为准确测定北极海洋沉积物中生源硅含量,优化生源硅化学提取法的提取条件,通过正交试验法,探讨了不同因素对生源硅提取效率的影响,优选出适合北极海洋沉积物中生源硅测定的实验条件.结果表明,各因素对提取效率的影响程度依次为:提取剂浓度>固液比>提取剂种类>提取温度;化学提取法的优选条件为:0.50 MOl/l氢氧化钠,固液比1.25 g/l,提取温度90℃.测得北极海洋沉积物标样中生源硅含量为57.03 Mg/g,平行误差2.51%,方法加标回收率介于76.15%--92.11%,相对标准偏差(rSd)为1.93%--7.52%.Biogenic silica(BSi) is a sort of amorphous silica from diatom,radiolarians,sponges and other siliceous organisms.BSi may reflect the spatial and temporal distribution of primary productivity and the environmental changes of aquatic systems.BSi has been widely used as a proxy of paleoceanography events and paleoclimate.In order to determinate the content of biogenic silica accurately from the sediment in the Arctic Ocean,this study used orthogonal experiment,tried to explore the influence of various factors on the determination of BSi,and then to optimize the experimental conditions.The results of orthogonal experiment show that the influence of each factor from high degree to low degree is as follows:solvent concentration > solid to liquid ratio > extraction solvents> extraction temperature.The optimized condition for the chemical extraction is suggested to be:the concentration of extraction solvent sodium hydroxide is 0.50 mol/L,the ratio of solid to liquid is 1.25 g/L and the extraction temperature is 90 ℃.The BSi content in the Arctic Ocean sediments is calculated as 57.03 mg/g(parallel error 2.51%),the ration of sample added recovery is between 76.15% and 92.11%,and the relative standard deviation is between 1.93% and 7.52%.国家自然科学基金项目(40376017;40576060
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