混合式教学模式在中学地理课程中的探索——以人教版“行政区划”为例

混合式教学模式是既能发挥教师在课堂中的启发、引导与监控作用又能提高学生参与度、体现个性化学习的一种教学模式。目前中学地理课堂仍强调死记硬背,学生学习的主观能动性不强。为了实现地理课堂的高效性,笔者应用新型智慧教学工具——“雨课堂”,通过中学地理教学实例说明实现混合式教学的基本路径,包括课前准备、课堂应用以及课后统计。     

Methane Flux into the Atmosphere in the South China Sea

Doklady Earth Sciences - The regional gas geochemical profile was first performed in the South China Sea in the north–south direction in January 2017 (42nd cruise of the R/V Akademik Boris...     

Sediment budget and riverbed deformation in the uppermost part of the lower Yangtze River,China

The Yangtze River(YR), similar to most large rivers in the world, has experienced significant changes in its depositional environment due to anthropogenic disturbances and climatic influences in recent decades. However, knowledge of how the river channel and bed deformation respond to these changes in the uppermost part of the lower YR, a 200-km-long branched channel, is limited. In the current study,historical bathymetric data collected from 1992 to 2013 and high-resolution multibeam echo sound...     

Formation of methane concentration and electromagnetic-field anomalies in southwestern Peter the Great Gulf (Sea of Japan)

We report methane concentrations in the bottom water layer and the upper layer of bottom sediments and the results of acoustic explorations of methane seeps on the shelf bordering the continental slope of the Sea of Japan region, in which electromagnetic Schumann’s resonance oscillations were earlier recorded at continental-slope water depths of 500, 1000, and 2000 m. The occurrence of Schumann’s resonances at such great depths is explained by an increase (a factor of more than 25) in the electrical resistivity of a ~ 2000 m thick sediment layer with the pore space largely filled with free methane. A new method is proposed for determining the depth of the sources of anomalous concentrations of methane in bottom sediments or in the bottom water layer on a deep shelf. The method is based on recording Schumann’s resonances during measurements of the natural electric field at a series of increasing depths in areas bordering the continental slope.     

黄河中游吉县段全新世古洪水滞流沉积物光释光测年研究

通过对黄河中游河口镇-龙门段峡谷进行详细的野外考察,在多个地点发现了含有古洪水滞流沉积物的全新世地层剖面。对山西省临汾市吉县段冯家集剖面的古洪水滞流沉积物系统采样,进行了沉积学及年代学分析研究。野外观测和粒度成分分析表明冯家集剖面夹有5层典型的古洪水滞流沉积物,其性质为细沙质粉沙,具有水平层理,层与层之间被坡积石渣土分隔。该层系的顶界高出黄河平水位达18m。它们是特大洪水在高水位滞流情况之下的悬移质沉积物,客观地记录了全新世时期黄河中游一期5次特大古洪水事件。通过分离出125~225μm石英颗粒,应用单片再生剂量法（SAR）测得其光释光年龄值,结合地层对比及各种气候替代性指标的分析,确定这些古洪水事件发生在3200~3000a B.P. 之间,处于全新世中期大暖期向全新世晚期相对干旱期转折的阶段。这对应我国历史上的商末-西周初期,季风气候状态不稳定,黄河流域既有严重地干旱,又有特大洪水事件发生。本文的研究成果为深入揭示河流水文系统对于全球变化的响应规律提供了新的可靠证据。