搜索结果: 1-15 共查到“理学 Ca”相关记录162条 . 查询时间(0.093 秒)
陨硫钙石(CaS)通常被认为是由太阳星云气凝结而成。顽火辉石陨石是陨硫钙石最重要的储存库之一,也是最还原的一类陨石,其是形成早期地球的代表性物质。因此,陨硫钙石对深入了解太阳星云、陨石、地球起源和地球的C-O-S-Ca循环具有重要意义。
李文君/高炳宇/王静等-SCES&JAAS&JAAS:基于碰撞反应池多接收等离子体质谱的K-Ca-Fe同位素高精度分析(图)
碰撞反应池 等离子体质谱 K-Ca-Fe同位素 高精度分析
2023/1/16
在海洋同位素均衡中,地下水输入的溶质通量长久以来被认为是不变的,且经常被忽视,即使不能完全忽视,也将这一部分归于河流输入的通量。由于缺乏对地下水排泄溶质通量的约束,海洋同位素δ7Li、δ26Mg、δ44/42Ca、87Sr/86Sr、δ88/86Sr和δ138Ba的均衡和依赖它们的准确性建立的地球系统模型存在巨大不确定性。
华南师范大学生命科学学院离子通道生物学课件 Ca channels。
中国有三个主要的克拉通,分别是华北、华南和塔里木,它们在显生宙经造山过程聚集到一起。塔里木克拉通位于中国的西北部,面积超过60万平方千米,其北侧为中亚造山带,南侧为西昆仑造山带和阿尔金造山带。塔里木克拉通的前寒武纪岩石主要出露在其南北两侧边缘,包括库鲁克塔格、敦煌、阿尔金、铁克里克和阿克苏地块,它们记录了塔里木克拉通早期的构造演化。北阿尔金地块的阿克塔什塔格地区位于塔里木克拉通的东南边缘。该地区最...
Migration history of an ariid Indian catfish reconstructed by otolith Sr/Ca and d18O micro-analysis
otolith oxygen isotope carbon isotope Sr/Ca Ba/Ca
2017/4/10
Understanding catfish ecology is important because catfish constitute one of the largest fish stocks in the coastal IndoPacific
regions. Recent technological advances have enabled the use of biologic...
Factors controlling the geochemical composition of Limnopolar Lake sediments (Byers Peninsula, Livingston Island, South Shetland Island, Antarctica) during the last ca. 1600 years
Lake sediments Limnopolar high resolution element analysis mineral composition energy dispersive x ray spectrometer glass mineral particles
2015/1/6
We sampled a short (57 cm) sediment core in Limnopolar Lake (Byers Peninsula, Livingston Island, South Shetland Islands), which spans the last ca. 1600 years. The core was sectioned at high resolution...
中国日用化学工业研究院主办的《日用化学工业》已进入美国《化学文摘》(Chemical Abstracts ,简称CA)数据库30余年,CA是现今世界上收录化学化工及其相关学科文献最全面,应用最广泛的文献检索工具之一,其传播范围广,影响力度强。
Precise determination of Sr/Ca by laser ablation ICP-MS compared to ICP-AES and application to multi-century temperate corals
coral Sr/Ca laser ablation ICP-MS ICP-AES
2017/4/11
Coral skeletal Sr/Ca compositions are valuable tools for the reconstruction of past tropical climate. While solutionbased
ICP-AES has become the preferred method to obtain monthly-resolved Sr/Ca reco...
显生宙棘皮动物骨骼均由高镁方解石组成,其骨骼的Mg/Ca比受海水Mg/Ca比、古海水温度、成岩作用等因素的影响. 研究以华南扬子区下奥陶统棘皮动物海百合化石为主要测试对象,通过能谱仪及波谱仪等微区原位分析方法,获得其骨骼可靠的Mg/Ca比. 化石骨骼显微构造和化学成分特征表明,扬子区下奥陶统海百合茎化石骨骼受到成岩作用的影响较弱,依旧保存有与壳体原始矿物有关的Mg含量特征. 测试结果显示,根据棘皮...
Coral growth-rate insensitive Sr/Ca as a robust temperature recorder at the extreme latitudinal limits of Porites
skeletal oxygen isotope in the coral Sr/Ca high latitudes coral growth rates
2017/4/11
Oxygen isotope values of low-growth coral (<5 mm/yr) skeletons may reflect kinetic effects, which is problematic for
sea surface temperature (SST) reconstruction. Here, we report a Sr/Ca-based SST re...
针对连续体结构拓扑优化中数值不稳定问题,借鉴控制系统中反馈控制和误差放大器的原理,构建了一种无梯度约束的变量更新规则,以结构应变能密度均匀分布为优化目标,建立了基于元胞自动机的拓扑优化模型,进行了二维连续体结构的拓扑优化设计,得到材料在设计域内的最优分布。通过求解三个经典的算例,探讨了不同的误差放大系数对优化结果的影响,试验结果表明,该更新规则能够有效地抑制棋盘格和网格依赖性问题。
Oxytocin hyperpolarizes cultured duodenum myenteric intrinsic primary afferent neurons by opening BK(Ca) channels through IP(3) pathway. J Neurochem
AH cell BKCa channel IP3 oxytocin PLC.J. Neurochem. (2012) 121 516–525.
2014/5/16
Oxytocin (OT) is clinically important in gut motility and constitutively reduces duodenum contractility. Intrinsic primary afferent neurons (IPANs), whose physiological classification is as AH cells, ...
Anisotropic $H_{c2}$ determined up to 92 T and the signature of multi-band superconductivity in Ca$_{10}$(Pt$_{4}$As$_{8}$)((Fe$_{1-x}$Pt$_{x}$)$_{2}$As$_{2}$)$_{5}$ superconductor
Anisotropic signature multi-band superconductivity superconductor
2012/2/27
The upper critical fields, $H_{c2}$($T$), of single crystals of the superconductor Ca$_{10}$(Pt$_{4-\delta}$As$_{8}$)((Fe$_{0.97}$Pt$_{0.03}$)$_{2}$As$_{2}$)$_{5}$ ($\delta$ $\approx$ 0.246) are deter...