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991.
Jin Li Suo‐han Tang Xiang‐kun Zhu Zhi‐hong Li Shi‐Zhen Li Bin Yan Yue Wang Jian Sun Yao Shi Aiguo Dong Nick S. Belshaw Xingchao Zhang Sheng‐ao Liu Ji‐hua Liu Deli Wang Shao‐yong Jiang KeJun Hou Anthony S. Cohen 《Geostandards and Geoanalytical Research》2019,43(1):163-175
Iron, Cu and Zn stable isotope systems are applied in constraining a variety of geochemical and environmental processes. Secondary reference materials have been developed by the Institute of Geology, Chinese Academy of Geological Sciences (CAGS), in collaboration with other participating laboratories, comprising three solutions (CAGS‐Fe, CAGS‐Cu and CAGS‐Zn) and one basalt (CAGS‐Basalt). These materials exhibit sufficient homogeneity and stability for application in Fe, Cu and Zn isotopic ratio determinations. Reference values were determined by inter‐laboratory analytical comparisons involving up to eight participating laboratories employing MC‐ICP‐MS techniques, based on the unweighted means of submitted results. Isotopic compositions are reported in per mil notation, based on reference materials IRMM‐014 for Fe, NIST SRM 976 for Cu and IRMM‐3702 for Zn. Respective reference values of CAGS‐Fe, CAGS‐Cu and CAGS‐Zn solutions are as follows: δ56Fe = 0.83 ± 0.07 and δ57Fe = 1.20 ± 0.13, δ65Cu = 0.57 ± 0.06, and δ66Zn = ?0.79 ± 0.12 and δ68Zn = ?1.65 ± 0.24, respectively. Those of CAGS‐Basalt are δ56Fe = 0.15 ± 0.07, δ57Fe = 0.22 ± 0.10, δ65Cu = 0.12 ± 0.08, δ66Zn = 0.17 ± 0.13, and δ68Zn = 0.34 ± 0.26 (2s). 相似文献
992.
薄互层砂体研究是湖盆沉积学的研究难点。本文针对辽河西部凹陷沙四上亚段(Es4上)薄互层砂体,以层序地层学、沉积学、测井地质学等理论为指导,综合岩心、测录井和地震等多种资料,对西部凹陷的薄互层砂体进行精细描述和深入剖析。结果表明,研究区主要发育辫状河三角洲和湖泊沉积相,其中,滩坝砂体是湖泊相的主力砂体。通过考虑不同沉积背景下滩坝在岩相组合、发育位置和成因机理的差异性,将滩坝划分成侧缘改造型滩坝、前缘改造型滩坝、基岩改造型滩坝、淹没改造型滩坝和风暴改造型滩坝5种沉积模式;对薄层滩坝砂体的控制因素进行分析,认为其受到"风场-物源-盆地"三端元的控制。 相似文献
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995.
Fangshi Jiang Kaiwen He Jiahui Lin Hui Li Zhenzhi Zhan Jinshi Lin Hongli Ge Ming Kuang Wang Yanhe Huang 《水文研究》2020,34(1):96-110
The effects of root systems on soil detachment by overland flow are closely related to vegetation types. The objective of this study was to quantify the effects of two gramineous roots (Paspalum mandiocanum with shallow roots and Pennisetum giganteum with deep roots) on soil detachment capacity, rill erodibility, and critical shear stress on alluvial fans of benggang in south-east China. A 4-m-long and 0.12-m-wide flume was used. Slope steepness ranged from 9% to 27%, and unit flow discharge ranged from 1.39 × 10−3 to 4.19 × 10−3 m2 s−1. The mean detachment capacities of P. mandiocanum and P. giganteum lands were 18% and 38% lower than that of bare land, respectively, and the effects of root on reducing soil detachment were mainly reflected in the 0- to 5-cm soil layer. The most important factors in characterizing soil detachment capacity were root length density and soil cohesion, and soil detachment capacity of the two grass lands could be estimated using flow shear stress, soil cohesion, and root length density (NSE = 0.90). With the increase in soil depth, rill erodibility increased, whereas shear stress decreased. The mean rill erodibilities of P. mandiocanum and P. giganteum lands were 81% and 61% as much as that of bare land, respectively. Additionally, rill erodibilities of the two grass lands could be estimated as an exponential function by root length density and soil cohesion (NSE = 0.88). The mean critical shear stress of P. mandiocanum and P. giganteum lands was 1.29 and 1.39 times that of bare land, respectively, and it could be estimated with a linear function by root length density (NSE = 0.76). This study demonstrated that planting of the two grasses P. mandiocanum and P. giganteum could effectively reduce soil detachment and enhance soil resistance to erosion on alluvial fans, with the deep roots of P. giganteum being more effective than the shallow roots of P. mandiocanum. The results are helpful for understanding the influencing mechanism of root systems on soil detachment process. 相似文献
996.
The paper relates to a motion planning algorithm for the feed support system of the Five-hundred-meter Aperture Spherical radio Telescope(FAST).To enhance the stability of the feed support system,the start/termination planning segments are adopted with an acceleration and deceleration section.The source switching planning adopts a combination of a line segment and focal segment to realize stable control of the feed support system.Besides,during the observation trajectory,a transition segment which is not used for observation data is planned with a required time.Through an example simulation,a smooth change is realized via the motion planning algorithm and presented in this paper. 相似文献
997.
NLOS GPS signal detection using a dual-polarisation antenna 总被引:2,自引:2,他引:0
The reception of indirect signals, either in the form of non-line-of-sight (NLOS) reception or multipath interference, is a major cause of GNSS position errors in urban environments. We explore the potential of using dual-polarisation antenna technology for detecting and mitigating the reception of NLOS signals and severe multipath interference. The new technique computes the value of the carrier-power-to-noise-density (C/N 0) measurements from left-hand circular polarised outputs subtracted from the right-hand circular polarised C/N 0 counterpart. If this quality is negative, NLOS signal reception is assumed. If the C/N 0 difference is positive, but falls below a threshold based on its lower bound in an open-sky environment, severe multipath interference is assumed. Results from two experiments are presented. Open-field testing was first performed to characterise the antenna behaviour and determine a suitable multipath detection threshold. The techniques were then tested in a dense urban area. Using the new method, two signals in the urban data were identified as NLOS-only reception during the occupation period at one station, while the majority of the remaining signals present were subject to a mixture of NLOS reception and severe multipath interference. The point positioning results were dramatically improved by excluding the detected NLOS measurements. The new technique is suited to a wide range of static ground applications based on our results. 相似文献
998.
Natural Hazards - The original article, Discrete dynamical Pareto optimization model in the risk portfolio for natural disaster insurance in China, in Natural Hazards (2018) 90: 445–460, was... 相似文献
999.
为了研究碱湖N2O释放速率及其对盐度与pH的响应,选取内蒙古大克泊碱湖的五个沉积物样点,采用15N同位素标记模拟实验,研究反硝化和厌氧氨氧化的速率、相对比例和气体产生情况,揭示高盐和高pH对碱湖氮移除的影响。发现大克泊湖潜在氮移除速率为0~16.06 n mol N mL-1 h-1,潜在反硝化速率为0~12.62 n mol N mL-1 h-1,潜在厌氧氨氧化速率为0~9.81 n mol N mL-1 h-1;当盐度34.00 g·L-1与pH 10.22时,厌氧氨氧化对氮移除贡献较大,达到43.18%~71.79%。反硝化过程气体产物以N2为主,几乎无N2O气体释出。另外,该区域潜在氮移除速率与pH呈正相关关系,与TOC、NO-3、HCO-3呈负相关关系;未发现氮移除速率与盐度之间的相关关系。因此,在研究的碱湖中,氮移除过程中主要为N2排放,而N2O低于检测水平;氮移除过程的影响因素复杂且不限于最主要的环境变量(盐度与pH)。这些结果为研究湖泊N2O排放提供了数据基础。 相似文献
1000.
湖南省传统农区乡村功能时空演变及影响因素研究 总被引:2,自引:1,他引:1
乡村是城市功能扩散与转移的重要承接地,乡村功能的时空演变及影响因素分析对实现城乡统筹发展与可持续发展具有重要意义。综合运用熵值法、冷热点分析和地理探测器等方法,以湖南省102个县市为研究对象,对湖南省乡村功能的时空演变、空间分异及其影响因素进行研究。结果表明:① 1997―2017年县域乡村生产和生活功能整体上呈现出上升的发展态势,而乡村生态功能整体上呈减弱的趋势。② 1997―2017年湖南省乡村功能热点区由长株潭地区向外扩张,而冷点区呈先收缩后扩张的发展态势;20 a间,在长株潭地区形成稳定的热点区,在湘西地区形成稳定的冷点区。③ 湖南省乡村功能空间分异是农业现代化、乡村就业主体、县域经济基础、城镇化、工业化等综合作用的结果,其影响力大小与方向存在显著的差异性,其中农业现代化水平、乡村就业主体对湖南省及5个地区乡村功能空间分异有重要的驱动作用。 相似文献