MRI: Acquisition of an Ultra-Centrifuge to Enhance Geoenvironmental Research and Education at California State University Los Angeles

MRI：购买超速离心机以加强加州州立大学洛杉矶分校的地球环境研究和教育

• 批准号: 1126892
• 负责人: Gustavo Borel Menezes
• 金额: $ 44.17万
• 依托单位: California State L A University Auxiliary Services Inc.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2014-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1126892&HistoricalAwards=false
• 关键词: MRI; Acquisition; Ultra; Centrifuge; Enhance

The objective of this Major Research Instrumentation (MRI) award is to acquire an ultracentrifuge with high payload capacity. The ultracentrifuge uses centrifugation forces to speed up the measurement of hydrogeological and contaminant fate and transport properties. The ultracentrifuge G Force ranges from 0 to 250 with a maximum 20,000 G-lbs at 600 RPM. The acquired equipment will enhance research training and education at all levels, especially in the following areas: (a) hydraulic conductivity dependence on saturation level in low conductivity soils under unsaturated anisotropic conditions; (b) long-term deterioration of containment barriers; (c) characterization of hydrogeological and transport properties using anisotropy coefficient of porous media; (d) isotope transport in low permeability sediments in the vadose zone; and (e) chemical weathering of soils in areas used for carbon sequestration.Measurement of unsaturated hydraulic conductivity in low conductivity soils can take years to be performed using most common approaches. Under steady-state centrifugation (SSC), which will be enabled through the acquisition of this equipment, the same measurement can be performed in a matter of days or even hours. The results will be widely disseminated to support research in the areas of underground contamination mitigation and groundwater protection. The instrumentation will be readily incorporated into undergraduate and graduate research and teaching programs available at CSULA.

该主要研究仪器（MRI）奖的目标是获得具有高有效载荷能力的超离心机。超离心机利用离心力来加速测量水文地质和污染物的命运和运输性质。超离心机的重力范围从0到250，最大20,000 G-lbs在600 RPM。购置的设备将加强各级的研究、培训和教育，特别是在下列领域：(a)在非饱和各向异性条件下低导电性土壤中，水力导电性取决于饱和水平；(b)围堵屏障长期恶化；(c)利用多孔介质各向异性系数表征水文地质和输运性质；(d)渗透带低渗透沉积物的同位素输运；(e)用于固碳的地区土壤的化学风化。低导电性土壤中非饱和水力导电性的测量可能需要数年时间才能使用最常见的方法进行。在稳态离心（SSC）下，这将通过收购该设备实现，相同的测量可以在几天甚至几小时内完成。研究结果将广泛传播，以支持在减少地下污染和保护地下水方面的研究。该仪器将很容易地纳入CSULA的本科生和研究生研究和教学计划。