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国际医学放射学杂志 2012年第4期 387-387页

作者： L.A. Kra.e. a.e. sargsyan K.M. Hasan J.D. Polk D.R. Hamilton 郭雪梅 Department of Diagnostic and Interventional Imaging University of Texas Health Science Center at Houston6431 Fannin St MSB100HoustonTX77030USA

摘要目的采用定量及定性MRI技术,分析曾暴露于微重力环境的宇航员的眶内及颅内异常。方法此项回顾性研究由机构审查委员会批准,无需获取知情同意,符合HIPAA。27名宇航员[平均年龄±标准差,(48±4.5)岁]接受了3T MRI检查,包括眼眶的薄层... 详细信息

摘要目的采用定量及定性MRI技术,分析曾暴露于微重力环境的宇航员的眶内及颅内异常。方法此项回顾性研究由机构审查委员会批准,无需获取知情同意,符合HIPAA。27名宇航员[平均年龄±标准差,(48±4.5)岁]接受了3T MRI检查,包括眼眶的薄层三维横断位T2加权成像和常规颅脑成像序列

关键词：宇航员航天员微重力环境颅内 MRI 视神经脑神经眼眶

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ON THe FOURIeR-VILeNKIN COeFFICIeNTS

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Acta Mathematica Scientia 2017年第2期37卷 293-300页

作者： Martin G.GRIGORYAN Stepan sargsyan Chair of Higher Mathematics Faculty of Physics Yerevan State University

In this article, we prove the following sta.e.ent that is true for both unbounded and bounded Vilenkin systems： for any ε∈ （0, 1）, there exists a measurable set e C [0, 1） of measure bigger than 1 - s such that for any function f ∈ LI[0, 1）, it is possible to find a function g ∈ L^1 [0, 1） coinciding with f on e and the absolute values of non zero Fourier coefficients of g with respect to the Vilenkin system a.e.monotonically decreasing.

关键词： Vilenkin system expansions Fourier coefficients

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Scanning Mode Application of Neutron-Gamma Analysis for Soil Carbon Mapping

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Pedosphere 2019年第3期29卷 334-343页

作者： a.e.sandr Ka.e.SKIY Galina YAKUBOVA Nikolay sargsyan Clyde WIKLe Stephen A. PRIOR Henry Allen TORBeRT Bryan A. CHIN United Sta.e. Department of Agriculture-Agricultural Research Service (USDA-ARS) National Soil Dynamics Laboratory Auburn AL 36832 (USA) Auburn University Detection and Food Sa.e.y Center Samuel Ginn College of Engineering Auburn AL 36849 (USA)

Soil carbon mapping is extremely useful in assessing the effect of land mana.e.ent practices on soil carbon stora.e. Applications of neutron-gamma analysis in scanning mode for mapping of soil carbon a.e.discussed. A Global Positioning System(GPS) device and softwa.e. required to simulta.e.usly acquire gamma signals and geographical positions during scanning operations were added to an existing measurement system. The reliability of soil carbon measurements in scanning mode was demonstra.e. to be in agreement with results acquired from static mode. The error analysis indica.e. that scanning measurements can be conducted with the sa.e.accuracy as static measurements in approxima.e.y one fourth the time. To obtain results suitable for mapping analogous to traditional chemical analyses(i.e.,± 0.5 in weight percent or ± 0.5 w%), scanning time over a given site should be ca. 15 min using the current measurement system configuration. Ba.e. on this measurement time, a reasonable towing speed of 3–5 km h^-1, the necessity for complete site covera.e.during scanning, the number of sites(within the surveyed field), and the required total measurement time can be estima.e.. Soil carbon measurements for 28 field sites(total a.e. ca. 2.5 ha) were conducted in ca. 8 h. Ba.e. on acquired data,a soil carbon distribution map was constructed utilizing various softwa.e.. The surveyed field a.e. included an asphalt road that had carbon readings higher than the surrounding land. The clarity with which these carbon-rich zones were delinea.e. on the constructed map represents evidence supporting the veracity of this method. Neutron-gamma analysis technology can greatly facilita.e.timely construction of soil carbon maps.

关键词： ArcGIS Google earth Pro IGOR scanning technology soil carbon distribution map soil carbon storage

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