检索结果-南通市图书馆

群体感知工具对社会调节学习的驱动因素与作用机制研究——基于扎根理论的质性分析

在线全文

学校读者我要写书评

暂无评论

电化教育研究 2024年第5期45卷 42-50,66页

作者：尹兴翰叶俊民于爽罗晟任文司开颜华中师范大学人工智能教育学部湖北武汉430079 华中师范大学计算机学院湖北武汉430079

计算机支持的协作学习中的群体感知工具,能够帮助学习者监控和反思学习过程,对促进社会调节学习起着重要作用。但当前研究主要关注群体感知工具的设计及其效果验证,而群体感知工具对社会调节学习的作用机制及驱动因素尚不明晰。因此,文... 详细信息

计算机支持的协作学习中的群体感知工具,能够帮助学习者监控和反思学习过程,对促进社会调节学习起着重要作用。但当前研究主要关注群体感知工具的设计及其效果验证,而群体感知工具对社会调节学习的作用机制及驱动因素尚不明晰。因此,文章以探索群体感知工具对社会调节学习的作用机理为目标,采用扎根理论研究方法,通过深度访谈获取学习者在协作学习活动中使用群体感知工具的经历、感受、体验等数据,借助质性分析软件对数据进行三级编码,最终构建了“刺激—感知—调节”理论模型。研究发现,学习者利用群体感知工具可以促进自我调节、同伴调节和集体调节学习,并且受到个体因素、教学因素及环境因素的驱动,在此过程中,学习者需要经历群体感知接收与理解,包括信息查看、信息选择、价值判断、自我比较和意义建构等过程。针对上述结论,文章给出相应教学启示,包括引导学习者理解群体感知工具的内容,辅助学习者应用群体感知工具进行调节等。

关键词：社会调节学习群体感知工具作用机制扎根理论质性分析

Fields experiments in North China show no decrease in winter wheat yields with night temperature increased by 2.0-2.5°C

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2012年第6期55卷 1021-1027页

作者： FANG ShiBo TAN kaiyan ren SanXue ZHANG XinShi ZHAO JunFang Chinese Academy of Meteorological Sciences Beijing 100081 China Institute of Botany Chinese Academy of Sciences Beijing 100093 China

The trends of daily maximum and minimum temperature in global warming indicated that the daily minimum temperature (Tmin) has risen more than twice as fast as the daily maximum temperature (Tmax) during the 20th century. Most researchers have focused on how the crops respond to daily mean temperature, whereas few controlled experiments were carried out to investigate how the crops respond to the Tmin rise. In particular, no experiment research has reported on how crops respond to the higher night temperature, which was the main trend in the climate warming. Taking winter wheat as the test crop, we investigated how the winter wheat growth and yields responded to the higher night temperature. In the field experiments, infrared heaters were used to increase higher night temperature (HNT) by about 2.5°C in contrast to the normal night temperature (CK) in two whole growth durations of winter wheat in 2008-2009 and 2009-2010 in North China. The results indicated that, compared to the CK treatment, winter wheat yield did not decline in HNT treatment, which increased temperatures by 2.0 2.5°C in both Warmer year (WY) and Colder year (CY). Furthermore, winter wheat yield in CY increased significantly in HNT treatment. HNT treatment in CY could significantly promote tillering and increase the effective panicles, which increased grain yield significantly (by more than 30% compared with CK). HNT treatment in CY contributed to an increase in the effective panicles and Kernels significantly, although making a significant reduction in 1000-grain weight, but did not lead to the yield decline. Under the HNT treatment, the whole growth duration of the winter wheat was shortened and the phenological dates were earlier except for the beginning of overwintering; the beginnings of the overwintering phase were postponed substantially and the ends of the overwintering phase were ahead of date compared to CK, which shortened the duration of overwintering considerably. We draw on our own studies to show examples of higher night temperatur

关键词：冬小麦产量夜间温度中国北方实验全球气候变暖作物育种温度上升田间试验

动物实验的研究计划指南——PREPARE解读

在线全文

学校读者我要写书评

暂无评论

兰州大学学报（医学版） 2024年第2期50卷 55-59页

作者：牛牧町赵跃易少威王浙阮建华谢蓓李朝霞胡凯燕奥琪任紫钰丁奉兴刘晨刘晏利孟保伟马彬甘肃中医药大学公共卫生学院兰州730000 兰州大学基础医学院兰州730000 甘肃省第二人民医院科研与研究生科兰州730000 西北民族大学临床医学院兰州730000 甘肃省妇幼保健院/甘肃省中心医院胸外科兰州730050

临床前动物实验是连接基础医学和临床医学的关键环节,动物实验设计的规范性对于动物实验的质量、可重复性、结果的可信度至关重要。本文对目前国际上已有动物实验的研究计划指南(PREPARE)进行介绍,PREPARE涵盖3个领域(研究计划制定、实... 详细信息

临床前动物实验是连接基础医学和临床医学的关键环节,动物实验设计的规范性对于动物实验的质量、可重复性、结果的可信度至关重要。本文对目前国际上已有动物实验的研究计划指南(PREPARE)进行介绍,PREPARE涵盖3个领域(研究计划制定、实验研究人员与动物实验室团体协作的构建、实验过程的质量控制),其中包含15个条目和42个亚条目,旨在普及相关知识,提高研究者对动物实验设计阶段的重视,同时为国内研究者规划动物实验提供参考。

关键词：动物实验动物实验的研究计划指南动物实验计划动物浪费 3R原则

Aerosol Hygroscopicity during the Haze Red-Alert Period in December 2016 at a Rural Site of the North China Plain

在线全文

学校读者我要写书评

暂无评论

Journal of Meteorological Research 2018年第1期32卷 38-48页

作者： Xuefei QI Junying SUN Lu ZHANG Xiaojing SHEN Xiaoye ZHANG Yangmei ZHANG Yaqiang WANG Haochi CHE Zhouxiang ZHANG Junting ZHONG kaiyan TAN Huarong ZHAO Sanxue ren State Key Laboratory of Severe Weather、Key Laboratory of Atmospheric Chemistry of China Meteorological Administration Chinese Academy of Meteorological Sciences Beijing 100081 Integrated Ecological-Meteorological Observation and Experimental Station Chinese Academy of Meteorological Sciences Beijing 100081

A humidification system was deployed to measure aerosol hygroscopicity at a rural site of the North China Plain during the haze red-alert period 17–22 December 2016. The aerosol scattering coefficients under dry [relative humidity（RH）〈 30%] and wet（RH in the range of 40%–85%） conditions were simultaneously measured at wavelengths of450, 550, and 700 nm. It is found that the aerosol scattering coefficient and backscattering coefficient increased by only 29% and 10%, respectively when RH went up from 40% to 80%, while the hemispheric backscatter fraction went down by 14%, implying that the aerosol hygroscopicity represented by the aerosol scattering enhancement factor f（RH） is relatively low and RH exerted little effects on the aerosol light scattering in this case. The scattering enhancement factors do not show significant differences at the three wavelengths, only with an approximate 2% variation, suggesting that the aerosol hygroscopicity is independent of the wavelength. Aerosol hygroscopicity is highly dependent on the aerosol chemical composition. When there is a large mass fraction of inorganics and a small mass fraction of organic matter, f（RH） reaches a high value. The fraction of NO3^- was strongly correlated with the aerosol scattering coefficient at RH = 80%, which suggests that NO3^- played an important role in aerosol hygroscopic growth during the heavy pollution period.

关键词： aerosol hygroscopicity scattering enhancement factor chemical composition

Comparison of Submicron Particles at a Rural and an Urban Site in the North China Plain during the December 2016 Heavy Pollution Episodes

在线全文

学校读者我要写书评

暂无评论

Journal of Meteorological Research 2018年第1期32卷 26-37页

作者： Xiaojing SHEN Junying SUN Xiaoye ZHANG Yangmei ZHANG Yaqiang WANG kaiyan TAN Peng WANG Lu ZHANG Xuefei QI Haochi CHE Zhouxiang ZHANG Junting ZHONG Huarong ZHAO Sanxue ren State Key Laboratory of Severe Weather/Key Laboratory of Atmospheric Chemistry of China Meteorological Administration Chinese Academy of Meteorological Sciences Integrated Ecological–Meteorological Observation and Experimental Station Chinese Academy of Meteorological Sciences Longfengshan Atmospheric Background Regional Station Heilongjiang Provincial Meteorological Bureau

An extensive field experiment for measurement of physical and chemical properties of aerosols was conducted at an urban site in the Chinese Academy of Meteorological Sciences（CAMS） in Beijing and at a rural site in Gucheng（GC）, Hebei Province in December 2016. This paper compares the number size distribution of submicron particle matter（PM1, diameter 〈 1 μm） between the two sites. The results show that the mean PM1 number concentration at GC was twice that at CAMS, and the mass concentration was three times the amount at CAMS. It is found that the accumulation mode（100–850 nm） particles constituted the largest fraction of PM1 at GC, which was significantly correlated with the local coal combustion, as confirmed by a significant relationship between the accumulation mode and the absorption coefficient of soot particles. The high PM1 concentration at GC prevented the occurrence of new particle formation（NPF） events, while eight such events were observed at CAMS. During the NPF events, the mass fraction of sulfate increased significantly, indicating that sulfate played an important role in NPF. The contribution of regional transport to PM1 mass concentration was approximately 50% at both sites, same as that of the local emission. However, during the red-alert period when emission control took place, the contribution of regional transport was notably higher.

关键词： particle number size distribution new particle formation severe haze-fog events Beijing-Tianjin-Hebei area Jing-Jin-Ji region submicron particles

Relative Contributions of Boundary-Layer Meteorological Factors to the Explosive Growth of PM2.5 during the Red-Alert Heavy Pollution Episodes in Beijing in December 2016

在线全文

学校读者我要写书评

暂无评论

Journal of Meteorological Research 2017年第5期31卷 809-819页

作者： junting zhong xiaoye zhang yaqiang wang junying sun yangmei zhang jizhi wang kaiyan tan xiaojing shen haochi che lu zhang zhouxiang zhang xuefei qi huarong zhao sanxue ren yang li state key laboratory of severe weather/key laboratory of atmospheric chemistry of china meteorological administration chinese academy of meteorological sciencesBeijing 100081 center for excellence in regional atmospheric environment institute of urban environmentchinese academy of sciencesBeijing 100081 integrated ecologica–meteorological observation and experimental station chinese academy of meteorological sciencesXiamen 361021 center for atmosphere watch and service meteorological observation centerchina meteorological administrationBeijing 100081

Based on observations of urban mass concentration of fine particulate matter smaller than 2.5 μm in diameter （PM2.5）, ground meteorological data, vertical measurements of winds, temperature, and relative humidity （RH）, and ECMWF reanalysis data, the major changes in the vertical structures of meteorological factors in the boundary layer （BL） during the heavy aerosol pollution episodes （HPEs） that occurred in winter 2016 in the urban Beijing area were analyzed. The HPEs are divided into two stages： the transport of pollutants under prevailing southerly winds, known as the transport stage （TS）, and the PM2.5 explosive growth and pollution accumulation period characterized by a temperature inversion with low winds and high RH in the lower BL, known as the cumulative stage （CS）. During the TS, a surface high lies south of Beijing, and pollutants are transported northwards. During the CS, a stable BL forms and is characterized by weak winds, temperature inversion, and moisture accumulation. Stable atmospheric stratifica- tion featured with light/calm winds and accumulated moisture （RH 〉 80%） below 250 m at the beginning of the CS is closely associated with the inversion, which is strengthened by the considerable decrease in near-surface air temperat- ure due to the interaction between aerosols and radiation after the aerosol pollution occurs. A significant increase in the PLAM （Parameter Linking Aerosol Pollution and Meteorological Elements） index is found, which is linearly re- lated to PM mass change. During the first 10 h of the CS, the more stable BL contributes approximately 84% of the explosive growth of PM2.5 mass. Additional accumulated near-surface moisture caused by the ground temperature de- crease, weak turbulent diffusion, low BL height, and inhibited vertical mixing of water vapor is conducive to the sec- ondary aerosol formation through chemical reactions, including liquid phase and heterogeneous reactions, which fur- ther increases the PM2.5 concentration levels. The contribution of these reaction mech

关键词： explosive growth of PM2.5 pollutant transport anomalous temperature inversion moisture accumula-tion light or calm winds

成人教育数字化学习资源与学习方式的关系研究

在线全文

学校读者我要写书评

暂无评论

北京宣武红旗业余大学学报 2023年第2期 10-14页

作者：马开颜任心燕北京教育科学研究院北京100036 北京宣武红旗业余大学北京100054

成人教育数字化转型要服务全民终身学习,从而形成在数字社会中每个人都能平等进行学习和交流的状态。利用波士顿矩阵分析数字化学习资源与学习方式的关系,双方相互影响,互为条件。成人教育数字化转型需要遵循学习资源与学习方式之间相... 详细信息

成人教育数字化转型要服务全民终身学习,从而形成在数字社会中每个人都能平等进行学习和交流的状态。利用波士顿矩阵分析数字化学习资源与学习方式的关系,双方相互影响,互为条件。成人教育数字化转型需要遵循学习资源与学习方式之间相辅相成的规律,遵循“以学生为中心”的教学理念,构建丰富的学习资源,并利用学习资源开展教学互动,促进学生主动学习,并且循序渐进地进一步丰富数字化学习资源,增强互动性。在教学理念与信息技术的双重加持下,完美实现成人教育的数字化转型。

关键词：数字化转型数字化学习资源学习方式波士顿矩阵

在线全文

学校读者我要写书评

暂无评论

加强全民数字技能培训的要素与路径

北京宣武红旗业余大学学报 2022年第3期 64-68页

作者：马开颜任心燕北京教育科学研究院职业教育研究所北京100036 北京宣武红旗业余大学北京100054

数字技能通用素质是数字时代的基本素质。加强全民数字技能培训是国家“十四五”职业技能培训规划的一项基本工作。数字技能通用素质是一种思维方式,需要通过学习者亲身经历、参与体验才能形成。针对成人的数字技能培训需要从形成通用... 详细信息

数字技能通用素质是数字时代的基本素质。加强全民数字技能培训是国家“十四五”职业技能培训规划的一项基本工作。数字技能通用素质是一种思维方式,需要通过学习者亲身经历、参与体验才能形成。针对成人的数字技能培训需要从形成通用素质的角度进行培训路径设计,分为学习者自带设备,引导解决处理实际的问题,教师的引导演示与学习者的自主参与体验同时进行,学习者反思总结规律、内化思维方式四个步骤。这样才能培养全民数字技能,为实现信息服务全覆盖提供人力资源的保障。

关键词：数字技能成人培训教学能力

在线全文

学校读者我要写书评

暂无评论

动物实验研究注册平台简介

医学新知 2024年第1期34卷 73-78页

作者：易少威王浙阮建华胡凯燕奥琪任紫钰赵跃丁奉兴刘晨刘晏利李朝霞马彬兰州大学基础医学院循证医学中心兰州730000 甘肃中医药大学公共卫生学院兰州730000 甘肃省循证医学与临床转化重点实验室兰州730000 甘肃省第二人民医院科研与研究生科兰州730000 西北民族大学临床医学院兰州730000

临床前动物实验是连接基础医学和临床实践的重要桥梁,动物实验注册的必要性日益显现。本文对目前国际上已有动物实验注册平台、注册内容、流程进行介绍,并比较分析,旨在普及动物实验注册相关知识,提高研究者注册意识,同时为国内研究者... 详细信息

临床前动物实验是连接基础医学和临床实践的重要桥梁,动物实验注册的必要性日益显现。本文对目前国际上已有动物实验注册平台、注册内容、流程进行介绍,并比较分析,旨在普及动物实验注册相关知识,提高研究者注册意识,同时为国内研究者进行动物实验注册提供参考。

关键词：动物实验注册平台动物实验注册