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| 1 | Evaluation of the carbon isotopic effects of NDIR and CRDS analyzers on atmospheric CO2 measurements显示文摘Non-dispersive infrared(NDIR) and cavity ring-down spectroscopy(CRDS) CO_2 analyzers use 12CO_2 isotopologue absorption lines and are insensitive to all or part of other CO_2-related isotopologues. This may produce biases in CO_2 mole fraction measurements of a sample if its carbon isotopic composition deviates from that of the standard gases being used. To evaluate and compare the effects of carbon isotopic composition on NDIR and CRDS CO_2 analyzers, we prepared three test sample air cylinders with varying carbon isotopic abundances and calibrated them against five standard cylinders with ambient carbon isotopic composition using CRDS and NDIR systems. We found that the CO_2 mole fractions of the sample cylinders measured by G1301(CRDS) were in good agreement with those measured by Lo Flo(NDIR). The CO_2 values measured by both instruments were higher than that of a CO_2 isotope measured by G2201i(CRDS) analyzer for a test cylinder with depleted carbon isotopic composition δ^(13)C =-36.828‰, whereas no obvious difference was found for other two test cylinders with δ^(13)C=-8.630‰ and δ^(13)C=-15.380‰, respectively. According to the theoretical and experimental results, we concluded that the total CO_2 mole fractions of samples with depleted isotopic compositions can be corrected on the basis of their 12CO_2 values calibrated by standard gases using Lo Flo and G1301 if the δ^(13)C and δ18O values are known. | XIA LingJun ZHOU LingXi Marcel V.van der SCHOOT Chris W.RELLA LIU LiXin ZHANG Gen WANG HongYang | 2016 | Science China Earth Sciences2016，59，6： | 2 |
| 2 | Longitudinal assessment of the development of diabetic polyneuropathy and associated risk factors显示文摘 | L. V.Van De Poll‐Franse G. D.Valk C. M.Renders R. J.Heine J. T. M.Van Eijk | 2002 | Diabetic Medicine2002，，： | 1 |
| 3 | 使用2-甲基戊烷作夹带剂乙醇-水集热精馏的研究显示文摘借助于微分同伦拓展算法研究分析以 2 -甲基戊烷作夹带剂的乙醇 -水集热共沸精馏流程 ,得到耗能最少和塔板数最少的塔构型流程 .模拟结果表明 ,夹带剂 2 -甲基戊烷的性能与戊烷相近 ,优于夹带剂苯 . | 沈文豪 V.Van Brunt | 2000 | 上海大学学报(自然科学版)2000，6，4： | 1 |
| 4 | Synthesis of nitrogen-tethered 1,6-enynes through CuI/TFA catalysis显示文摘A novel method for the concise and effective construction of nitrogen-tethered 1,6-enynes in moderate to good yields was developed.This transformation involves a TFA-promoted Pictet-Spengler reaction/iminium formation,copper-catalyzed alkyne-iminium ene reaction/alkynylation of a 2-arylethan-1-amine,formaldehyde solution,and a terminal alkyne.The process features exclusive chemoselectivity,simple operation,and high atom economy.Preliminary experimental studies suggest that the alkyne-iminium ene reaction involving an intermolecular hydride transfer is the key step in the current methodology. | Leilei Cao Liliang Huang Xianjun Xu Erik V.Van der Eycken Huangdi Feng | 2022 | Organic Chemistry Frontiers2022，9，2： | 0 |
| 5 | GBTL-波段高灵敏度19单元双极化致冷相控阵馈源显示文摘作为格林班克射电望远镜(GBT Green Bank Telescope)L波段焦平面阵计划(FLAG,Focal L-band Array for the GBT)的一部分,GBT的Robert开发了1种新的1.4 GHz、19单元双极化致冷相控阵馈源(PAF Phased-Array Feed)天文接收机,用校准射电源调试观测的数据表明,该接收机是迄今为止所有已报道PAF接收机中用口径效率(Ti)归一化的波束形成系统噪声温度(Tsys)最低的。在1350 MHz附近测量的视轴方向波束的Tsys/ii为25.4±2.5K,这个测量值与目前GBT使用的1.4GHz单馈源致冷接收机的性能相当,相比于视轴方向的Tsys/η值,在偏离视轴约4″(Nyquist奈奎斯特采样要求)和8'时的Tsys/η分别降低了1%和20%。与单波束系统相比,7波束PAF馈源的巡天速度分别约增加了2.1和7倍,并与观測应用有关。测量的性能,不论是频率和偏离视轴的值,与PAF馈源严格的电磁模型预计值一致。通过对脉冲星B0329+54和扩展H Ⅱ区域-玫瑰星云的观测,证明了该接收机在天文观測中的实用性。通过使用新的PAF馈源,增强了巡天速度,将使GBT能够开展令人兴奋的新的科学观测,如更有效地观測弥散、星系流入的中性氢福射以及搜索快速射电暴。 | D.Anish Roshi W.Shillue B.Simon K.F.Warnick B.Jeffs D.J.Pisano R.Prestage S.White J.R.Fisher M.Morgan R.Black M.Burnett J.Diao M.Ruzindana V.van Tonder L.Hawkins P.Marganian T.Chamberlin J.Ray N.M.Pingel K.Rajwade D.R.Lorimer A.Rane J.Castro W.Groves L.Jensen J.D.Nelson T.Boyd A.J.Beasley 段玉虎(译) | 2022 | 测控与通信2022，46，1： | 0 |
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