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91.
Stokes polarization profiles of the Mg?b2 5172.68 Å spectral line on two simple sunspots are obtained with the Multi-Channel Solar Telescope (MCST) at the Huairou Solar Observing Station (HSOS). This is done by means of scanning this line over the wavelength interval from 200 mÅ redward of the line center to 200 mÅ blueward, in steps of 10 mÅ. A generalized analytic solution to the transfer equation for polarized radiation is presented. With a nonlinear least-square fitting technique, the linear calibration coefficients for the low-chromospheric longitudinal magnetic field is obtained in the weak-field case. We also discuss the problems in calibrating the transverse field with this line. It is shown that the weak-field approximation is not applicable to the chromospheric Mg?b2 line for the transverse component of the magnetic field. 相似文献
92.
A two-dimensional, depth-integrated model proposed by Lynett and Liu (2002) was checked carefully, and several misprints in the model were corrected after detailed examination on both the theory and the numerical program. Several comparisons were made on wave profile, system energy and maximum wave amplitude. It is noted that the modified model can simulate the propagation of the internal solitary waves over variable bathymetry more reasonably to a certain degree, and the wave profiles obtained based on the modified model can better fit the experiment data reported by Helfrich (1992) than those from original model. 相似文献
93.
基于MapX面向对象的专题地图管理信息系统的设计与实现 总被引:1,自引:2,他引:1
在分析MapX的特点和应用情况的基础上,介绍了长春市专题地图管理信息系统的结构和功能;论述了基于MapX开发专题地图管理信息系统的方法,给出了专题地图管理、双向查询、数据库联接等功能的实现方法,并对系统建设中遇到的一些技术难点问题和解决方法进行了详细分析。 相似文献
94.
本文推导了激光测月资料归算中测距对地月系轨道根数的偏导数,并对所得偏导数进行了精度估计,利用这些偏导数和1988年至1992年全球激光测月资料解算了日月轨道根数,得到了比较理想的结果。 相似文献
95.
根据跨断层定点水准、基线观测资料和垂直形变的水准高程观测数据分析,黑孜尔断裂 F2定点水准的垂直位移量为 0. 14 mm/a,基线缩短量为 0. 48 mm/a,断层滑动角■≈37°,现今垂直形变速率为 0. 693 mm/a。结合地震活动和区域地质构造研究,认为黑孜尔断裂近期水平活动强度大于垂直运动强度,该区在未来1~3年内仍可能发生6级以上地震。 相似文献
96.
提出了一种用于垂直形变分析的附有标高刻度的三维立体剖面图的全新模型方法 ,介绍了用这一模型方法建立国家复测水准网三维立体剖面图模型的过程。使用表明 ,这一模型方法与目前常用的三维空间表示方法相比 ,在定量、定位分析水准点的沉降变化时具有直观、快速等优点。 相似文献
97.
Junhong Bai Qingqing Zhao Junjing Wang Qiongqiong Lu Xiaofei Ye Zhaoqin Gao 《中国地理科学(英文版)》2014,24(3):279-286
Little information is available on denitrification potential of marsh soils in natural saline-alkaline wetlands. The denitrification potentials of an open wetland in the floodplain(Erbaifangzi wetland) and a closed wetland(Fulaowenpao wetland) in backwater areas in Jilin Province of Northeast China were monitored by an anaerobic incubation at 30℃ for 25 days. Our results showed that the relative denitrification index(RDI) increased gradually with incubation time, and showed a rapid increase in the first 5 days of incubation. The RDI values declined quickly from surface soils to subsurface soils and then kept a small change in deeper soils along soil profiles over the incubation time. Denitrification proceeded much faster in the top 20 cm soils of open wetland than in the closed wetland, whereas no significant differences in RDI values were observed in deeper soils between both wetlands. The RDIs were significantly negatively correlated with bulk density and sand content, while a significantly positive correlation with clay content, soil organic matter, total nitrogen and phosphorous. The maximum net NO–3-N loss through denitrification in 1 m depth were higher in the open wetland than the closed wetland with higher soil pH values. Future research should be focused on understanding the influencing mechanisms of soil alkalinity. 相似文献
98.
Diagenetic control of magnetic susceptibility variation in Core MD98-2172 from the Eastern Timor Sea
Detailed mineral magnetic measurements, integrated with grain-size distribution and X-ray diffraction (XRD) analyses, were
made on the marine sediments of Core MD98-2172, retrieved from the Eastern Timor Sea. Values of magnetic susceptibility in
this core drop sharply down-core from ∼3.85 m deep below sediment/water interface and are very low at ∼5.35 m. However, both
XRD and grain-size distribution results show no sudden change in terrigenous input during sedimentation. Mineral magnetic
results indicate that the depth of ∼3.85 m may be an oxic/anoxic boundary. Therefore, the sediments below ∼3.85 m have been
subjected to intense reductive diagenesis, whereas the sediments above ∼3.85 m are seldom affected. The magnetic properties
of the sediments shallower than 3.85 m are dominated by pseudo-single domain (PSD) magnetite, with little down-core variation
in its content and grain size. Below ∼3.85 m, the magnetic mineral assemblages that have survived in the sediments may record
different stages of the reductive diagenesis: (1) the sediments from the 3.85–5.35 m interval are at the stage of iron oxide
reduction; PSD magnetite is the major magnetic contributor, but it becomes less abundant and coarser down-core; (2) the sediments
below ∼5.35 m are at the stage of sulphate reduction; ferrimagnetic minerals almost vanish and paramagnetic minerals contribute
to down-core susceptibility variations, including pyrite as evidenced by high-temperature magnetic susceptibility measurements.
However, the susceptibility variations below ∼5.35 m of Core MD98-2172 show obvious periodicity, despite the intense effect
of reductive diagenesis. Furthermore, the down-core susceptibility variations are coincident with fluctuations in the quantity
of fine detrital particles (<8 μm), which may come mainly from the advection of the Indonesia Throughflow (ITF) and/or river
input from Timor. Therefore, for Core MD98-2172, susceptibility variation below ∼5.35 m, which potentially correspond to fluctuations
in the quantity of fine particles, may record the histories of the development of the ITF and precipitation on Timor. 相似文献
99.
100.
X. Bai T.K. Gaisser A. Karle K. Rawlins G.M. Spiczak Todor Stanev 《Astroparticle Physics》2006,25(6):361-367
The muon flux at the South Pole was measured for five zenith angles, 0°, 15°, 35°, 82.13° and 85.15° with a scintillator muon telescope incorporating ice Cherenkov tank detectors as the absorber. We compare the measurements with other data and with calculations. 相似文献