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101.
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L.J. Hou M. Liu J.J. Lu S.Y. Xu D.N. Ou Y. Yang D.G. Zheng 《Environmental Geology》2006,49(7):937-945
The influences of exposure to the atmosphere on ammonium cycle in the intertidal surface sediments were in situ studied with
a geochemical approach at a typical station in the Yangtze Estuary during three tidal cycles in September 2003. During an
about 8-h emersion period of each diurnal tide, six high-resolution vertical profiles of adsorbed and dissolved ammonium were
measured. It was observed that both adsorbed and dissolved ammonium generally had an increasing trend in sediment cores during
the exposure. The rate of ammonium regeneration in sediments was estimated using the accumulation amount of ammonium including
adsorbed and soluble fractions during the daytime emersion. The calculation result showed that there was relatively high ammonification
rate (˜500 nmol N cm−3 day−1), which reflected that organic nitrogen in sediments was quickly decomposed with a residence time of ˜52.7 days. Due to the
dramatic temperature difference observed in sediment profiles, free convection was considered an important mechanism of regulating
the efflux of produced ammonium into overlying waters. The total estimated amount of regenerated ammonium was ˜1.35×105 t N year−1 in the intertidal flat of the Yangtze Estuary, which occupied 7.6% of the total inorganic nitrogen annually transported to
the estuarine ecosystem. 相似文献
104.
基于ArcObject技术的森林扑火队行程轨迹回放功能研发 总被引:1,自引:1,他引:1
采用二次开发语言VB,并通过Arc/Info的组件ArcObject(AO)以及SQL数据库,对全球定位系统GPS及时采集的点坐标数据进行海量存储并在地理信息系统操作平台上实现轨迹的回放。使GPS和GIS实现更加灵活规范的系统化,突破了GIS平台的相对独立性的局限,实现面向对象的多系统集成。 相似文献
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摄影测量数据库主要存储和管理数字地图成果数据,包括数字高程模型数据(DEM)、数字矢量地图数据(DLG)、数字影像地图数据(DOM)和数字栅格地图数据(DRG)。本文主要介绍了摄影测量数据库的设计、建立以及应用分析等内容。 相似文献
107.
For precise real time or near real time differential GPS positioning in a wide or global area, precise GPS orbits or, alternatively,
precise orbital corrections with respect to a reference orbit, such as GPS broadcast ephemerides, must be used. This work
tests orbit interpolation methods, in order to represent the GPS orbits and orbital corrections accurately and efficiently
for these and other GPS applications. For precise GPS orbits given in the SP3 format at the 15 min interval, numerical tests
were conducted using Lagrange and Chebyshev as well as trigonometric polynomial functions. The results have demonstrated that
the 19- or 20-term trigonometric function is apparently the most efficient interpolator for a 12 h GPS orbital arc, achieving
1 cm level 3D interpolation accuracy that can meet the requirements of most precise applications. The test results also demonstrated
that the 9-term trigonometric function always yields optimal interpolation for a 2 h GPS orbit arc, in terms of interpolation
errors, compared to the results when using a different number of terms for the same function or one of the other tested polynomial
functions. This is evident from the minimal performance degradation when using the 9-term trigonometric function to interpolate
near or at the end of a data interval. By limiting interpolation to the center 15 min to 1.5 h of a 2 h orbit arc, thereby
eliminating the need to interpolate near the ends of that interval, users can opt for more terms (11 and 13) or different
interpolators to further improve interpolation accuracy. When interpolating the orbital corrections with respect to the GPS
broadcast ephemeris, all the tested interpolation functions of 3- to 9-term yield the same suitably accurate results. Therefore,
a 3- to 5-term trigonometric function is arguably sufficiently accurate and more efficient for GPS orbital correction messaging
in wide area and real time positioning. 相似文献
108.
利用M-LDARS闪电定位系统对北京及其周边地区1995~1997年6~9月的闪电观测数据, 分析闪电活动的时空分布特征。结果表明:闪电活动在时间分布上存在两个峰值时段, 13 :00~21:00和23:00~次日05 :00。通过对总地闪、分时段及峰值时段的地闪密度分析, 发现北京及周边地区闪电活动有几个明显的集中区域, 地闪高密度区主要出现在下垫面为山脉和水体的地方, 闪电活动与下垫面的水汽条件关系密切, 且正、负地闪的空间分布也呈现较大差异, 表明雷暴云的电荷结构存在一定差异。 相似文献
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课题在2002年严格按照与科技部签定的任务合同书顺利进行,并取得了可喜的研究成果: ■完成了夏延Ⅲ新型云物理和人工增雨飞机的改装,飞机装备有云物理综合探测系统和本课题研制的碘化银末端燃烧器,并在河南示范区冬季人工增雨(雪)科学试验中获得了一批符合科学设计的综合探测资料. 相似文献