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991.
992.
冕洞的研究在近二十多年里取得了丰硕的成果。本文回顾了冕洞的发现及观测历史,系统阐述了冕洞的结构特征、形成及演化规律,讨论了冕洞对日地空间产生的影响,冕洞与超级活动区的关系以及冕洞在太阳活动预报中所起的作用,在此基础上利用1970—1995年的冕洞资料对冕洞的时空分布和磁极性演化规律与太阳活动周的关系,以及冕洞与太阳风速度、地磁扰动等方面进行分析研究,得出以下结论:(1)冕洞在南北半球的分布在形态上基本是对称的,但在冕洞数量上北半球稍占优势;(2)冕洞的盛衰演化呈周期性,表现为赤道冕洞周期与黑子周期是完全一致的,极冕洞周期与黑子周期相位相差180°;(3)赤道冕洞的纬度分布随太阳活动周上升而上升,当太阳活动周达到极大值时,它也达到极大,然后再随太阳活动周下降而下降,极冕洞的纬度延伸方向演化与赤道冕洞相反;(4)极冕洞的极场呈11年周期性,并且极场反转出现在太阳活动峰年期间;(5)太阳风和地磁扰动与冕洞的演化有着密切的关系 相似文献
993.
叙述了客户机/服务器结构的地图数据库发展的必要性,对客户机/服务器结构的地图数据库分布管理概念、结构及网络环境进行了论述和设计. 相似文献
994.
Gong-liang Zhang 《Chinese Astronomy and Astrophysics》1996,20(4):482-486
Observed instances are given in this paper to show that sub-Alfvénic flow can be formed in the quiet and recurrent low-speed solar wind streams. This kind of flow appears in regions with abnormal enhancement of Alfvénic speed and is associated with a specific type of magnetic configuration. 相似文献
995.
The alkalic Scituate Granite was emplaced into crystalline sequences within the New England Esmond–Dedham terrane in the Late Devonian ( c. 370 Ma). Variably recrystallized amphibole (iron-rich, hastingsite–hastingsitic hornblende) from four variably deformed samples of the pluton record south-westerly younging 40 Ar/39 Ar plateau ages ranging between 276 and 263 Ma. These are interpreted to date diachronous cooling through temperatures appropriate for intracrystalline retention of argon following late Palaeozoic orogenic activity. Iron-rich biotite concentrates from the samples record only slightly younger ages, and therefore suggest relatively rapid post-metamorphic cooling. The 40 Ar/39 Ar ages indicate that the late Palaeozoic tectonothermal overprint was much more regionally pervasive than was previously considered. The apparent timing of this activity is similar to previous estimates for the chronology of high-grade metamorphism throughout the adjacent Hope Valley terrane and for phases of ductile movement on the intervening Lake Char–Honey Hill fault system. 相似文献
996.
魏续占 《地球科学与环境学报》1996,(2)
用多种分析手段分析了Sol-gel法制取的Al2O3系陶瓷涂层在烧结过程中的组织变化以及烧结后涂层的成分和组织结构;对涂层的高温抗氧化性、耐蚀性、耐磨性以及涂层与金属基体的结合力进行了测试,结果表明,Sol-gel法制取的Al2O3系陶瓷涂层由氧化物晶体、过渡相和玻璃体混合而成,涂层与基体之间有很好的结合力,金属基体的抗氧性、耐蚀性、耐磨性能有明显提高. 相似文献
997.
We present an analysis of OH, CN, and C2 jets observed in thecoma of Comet Hale–Bopp on UT April 22, 23, and 25, 1997. Monte Carlomodels designed to simulate the
gas jets were employed to analyze thenuclear active areas responsible for the observed coma gas jets. Ourresults indicate
that four active areas are necessary to reproduce theCN and C2 jets while five active areas are required to simulatethe OH jets. The additional OH active area must produce significantlevels
of OH, but cannot emit measurable quantities of either carbonradical. This difference suggests that the nucleus of Comet Hale–Boppis
chemically heterogeneous. 相似文献
998.
Fabry-Pérot interferograms of comet Hale-Bopp were obtained on several nights in March and April 1997. For this purpose we
utilized the 2-channel focal reducer of the Max-Planck-Institute for Aeronomy at the 2-m telescope of the Pik Terskol Observatory.
Solid Fabry-Pérot etalons of resolving power 30000 were used in both channels of the focal reducer. The main aim of this study
is to measure the velocities and abundances of OH+ and H2O+, both ions closely related to the same parent molecule, H2O. In the blue channel interferograms we identified several individual OH+ rotational lines of the A3Πi - X3Σ− (0-0) transition and measured their Doppler shifts. The target emissions in the red channel were the H2O+ lines of the A2A1 − X2B1 (10-0) band. We found that the line of sight velocities, obtained from the Doppler shifted wavelengths of emissions in the
comet are higher in sunward direction than in the plasma tail and do not exceed 20 km s–1. The corresponding values, deprojected in antisolar direction, are consistent with predictions by magnetohydrodynamical models
of the solar-wind-comet interaction, when one accounts for the extremely high gas production rate of comet Hale-Bopp.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
999.
超声波测风仪设计中几个问题的探讨 总被引:2,自引:0,他引:2
通过比较Gill仪器的Winsonic 2D测风仪和螺旋浆式风速风向计05103L的实测效果,分析了超声波测风仪测风的特点.进而分析了几种超声波测风的检测机理、系统组成和设计的注意事项;同时探讨了如何解决超声波测风仪目前使用中存在的一些问题(如:全天候使用、环境影响补偿等).最后讨论了超声波的传输特性和大气中的杂质对风速、风向测量的影响. 相似文献
1000.
MA Qimin LUO Xia YU Zhigang 《中国海洋大学学报(英文版)》2007,6(3):231-236
To unambiguously identify spilled oils and to link them to the known sources are extremely important in settling questions of environmental impact and legal liability. The fate and behavior of spilled oils in the environment depend on a number of physicochemical and biological factors. This paper presents the results regarding changes in chemical composition of light crude oil during simulated short-term weathering based on natural environmental conditions. The results show that the saturated hydrocarbons of the light crude oil mainly distribute between n-C8 and n-C23 and the most abundant n-alkanes are found in the n-C10 to n-C16. The main chemical components of the light crude oil are n-alkanes and isoprenoids. The aromatic compounds are subordinate chemical components. Under the conditions of the weathering simulation experiment,n-alkanes less than n-C12,toluene and 1,3-dimethyl benzene are lost after 1 d weathering,the n-C13,n-C14,naphthalene and 2-methyl-naphthalene are lost on the fifth day of weathering,and n-C15 alkane components show certain weatherproof capability. The ratios n-C17/pristane and n-C18/phytane are unaltered and can be used to identify the source of the light crude oil during the first 8 d of weathering. After 21 d,the ratio pristine/phytane can not provide much information on the source of the spilled light crude oil. Triterpanes(m/z 191) as biomarker compounds of light crude oil are more valuable. 相似文献