Results 61 to 70 of about 39,766 (300)
萨拉乌苏河流域末次间冰阶气候 - 以米浪沟湾剖面为例 [PDF]
, 2007 米浪沟湾剖面末次间冰阶层序粒度和化学元素波动韵律与由古流动砂丘砂和上覆河湖相或古土壤构成的沉积旋回颇为一致。古流动砂丘砂犹如现代流动砂丘砂, 是东亚冬季风主导下干冷气候的产物; 河湖相和古土壤颗粒细化, 化学、生物等地球风化程度增强, 含较多喜暖的软体动物化石, 指示其偏南夏季风主导下的温暖湿润气候。据此, 末次间冰阶萨拉乌苏河流域至少经历了10次温湿(W事件)和9次冷干(C事件)气候波动, 且可划分为MIS3e(58.85~48.98 ka BP)、MIS3d(48.98~39.55 ka BP ...
Chen, D +7 more
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Effect of Processing Method on the Microstructure of Nd4.5Fe77B18.5 Magnetic Alloy [PDF]
, 2012 The effects of processing method including arc-melted process, rapid solidification and laser crystallization on the microstructure of Nd4.5Fe77B18.5 alloy were investigated. The results showed that the microstructure of the arc-melted alloy was composed
Guo, Baohui
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Conservation Biology, EarlyView.Abstract Marine protected and conserved areas (MPCAs) are promoted as an ecosystem‐based adaptation (EbA) approach to increase community and ecosystem resilience to climate change. However, traditional approaches to MPCA design typically do not consider climate risk or habitat condition under a climate threat.
Alyssa L. Giffin +6 more
wiley +1 more source
Earth Science-Journal of China University of Geosciences, 2023 Yan Wang +3 more
semanticscholar +1 more source
Study of P2-Type Layered Oxides and Mixed-Type Phosphates as Cathode Materials for Sodium Ion Batteries [PDF]
, 2015 随着储能需求的不断增长，钠离子电池作为一类有潜力的廉价能源储存体系开始受到越来越大的关注。为了使钠离子电池在能量密度上具有更强的竞争力，就必须发展具有较高电压的正极材料。正极材料主要可以分为两大类，即氧化物型和聚阴离子型。其中，P2型层状Na-Ni-Mn-O体系和混合聚阴离子型Na4Fe3(PO4)2(P2O7)体系分别在两大类材料中具有相对较高的放电电压。然而，若要使这两类材料体系发挥出较好的电化学性能，仍有许多问题亟待解决。P2型Na-Ni-Mn ...
吴学航
core
Opportunities, research gaps, and risks in allogenic ecosystem engineer mimicry
Conservation Biology, EarlyView.Abstract In an age of anthropogenically driven species loss and increasingly novel ecosystems, ecosystem engineer restoration is a process‐based approach to supporting ecosystem function. Many ecosystem engineers have low or declining population sizes.
Brandi Goss +2 more
wiley +1 more source
Jixie chuandong, 1990 本文根据相对运动的原理,给整个行星传动加上一个与转臂角速度大小相等而方向相反的角速度,于是转臂可视为静止不动,转化为定轴传动,即转化机构;这样既不改变各构件间的相对运动,也不改变各构件间的受力关系,因此本文在这基础上计算行星锥盘无级变速器的传动比,分析这种变速机在恒功率、恒转矩时各摩擦轮上的作用力,并附有例题。
冯澄宙
doaj
Assessing the Corn Belt as an anthropogenic barrier to migrating landbirds in the United States
Conservation Biology, EarlyView.Abstract Migrating landbirds adjust their flight and stopover behaviors to efficiently cross inhospitable geographies, such as the Gulf of Mexico and the Sahara Desert. In addition to these natural barriers, birds may increasingly encounter anthropogenic barriers created by large‐scale changes in land use. One such barrier could be the Corn Belt in the
Fengyi Guo +7 more
wiley +1 more source
[Fucoidan-Modified Phase-Transitional Contrast Agent for Ultrasound Imaging and Targeting of Hepatoma Cells]. [PDF]
Sichuan Da Xue Xue Bao Yi Xue Ban, 2022 Huang JB +5 more
europepmc +1 more source