五号桩海区悬移质输运量的计算   总被引：1，自引：0，他引：1  

侍茂崇赵进平  王喜瑞李显烈 《山东海洋学院学报》1985,15(1):113-126

It’s very important to study the transportation of suspended matter for the coats engineering. We have to understand the quantity and direction of the movement of suspended matter for studying the change of coast and deposit of sediment on the sea bed. For this porpose we have measured the currents and the quantity of suspended matter near the section B in different seasons since 1983.According to data and calculation, we’ve got the following conclusions: 1) The quantity of suspended matter transported by tidal current through the section B is about 19.6 million tons each year, but the transportation, quantity is the same in both direction of flood tide and ebb tide. 2) The quantity of suspended matter removed by residual current is about 8.57 million tons each year, the direction of tran.spotation points to north‘west. 3) The transportation quantity of suspended matter due to the winddriven current in. storm weather is about 0.95 million, tons each year,the direction of transportation points to south.  相似文献   

一组高精度椭球面电子计算实用公式   总被引：9，自引：1，他引：8  

顾旦生 《测绘通报》1997,(3):2-9

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地形图高程中误差计算公式实验研究     

赵培栋 《北京测绘》1990,(1):38-42

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Hydroxycalciopyrochlore,A New Mineral Species from Sichuan,China     

YANG Guangming  LI Guowu  XIONG Ming  PAN Baoming  YAN Chenjie 《《地质学报》英文版》2014,88(3):748-753

Hydroxycalciopyrochlore, ideally(Ca,Na,U,□)2(Nb,Ti)2O6(OH), cubic, is a new mineral species(IMA2011-026) within the pyrochlore supergroup that was found occurring at the Maoniuping mine, Mianning County, Xichang prefecture, Sichuan Province, southwest China. The mineral is found in an alkali feldspar granite rare-earth ore deposit(26–27 Ma). Associated minerals include calcite, barite, celestine, albite, aegirine, aegirine-augite, fluorite, parasite-(Ce), thorite, thorianite, zircon, galena, sphalerite, magnetite, and pyrite. Crystals occur mostly as octahedra, and less often as dodecahedra and tetrahexahedra or combinations thereof. Some occur with an allotriomorphic habit with a thick triangular tabular form. Crystals generally range from 0.1 to 1 mm in size. The mineral is brownishblack, greenish-black and black on fresh sections with a brown streak. The crystal is translucent, and has a greasy lustre on fresh sections. It is metamict without any observed parting or cleavage and with a conchoidal fracture. The Vickers microhardness is 572 kg/mm2(5–6 on the Mohs hardness scale). The density measured by hydrostatic weighing is 5.10(3) g/cm3. The strongest four reflections in the X-ray powder-diffraction pattern [d in(I) hkl] are: 2.9657(100) 2 2 2, 1.8142(34) 0 4 4, 1.5463(21) 2 2 6, 2.5688(18) 0 0 4. The unit-cell parameters are a = 10.381(4), V = 1118.7(7)3, Z = 8. The structure was solved and refined in the space group Fd3m with R = 0.09. The empirical formula is(Ca0.74Na0.58U0.40Ce0.05Fe0.02□0.21)2.00(Nb1.15Ti0.80Ta0.03Al0.01Mg0.01)2.00O6.02 [(OH)1.01F0.09]1.10, on the basis of 2 atoms of B pfu; the simplified formula is(Ca,Na,U,□)2(Nb,Ti)2O6(OH). Type material is deposited in the Geological Museum of China, Beijing, People's Republic of China, catalogue number M11800.  相似文献   

地面岩（矿）层厚度计算公式的数学推导     

沈权  张靖华 《云南地质》2014,(2):279-281

地面岩（矿）层厚度计算公式是地质工作者常用的、基本的地（矿）层厚度计算公式,本文用数学方法系统推导,并阐明岩（矿）层真厚度、地表实测岩（矿）层长度、岩（矿）层倾角、地面坡角、岩（矿）层走向法线与岩（矿）层实测线的交角及岩（矿）层走向与岩（矿）层实测线的交角之间的数学关系,证明地面岩（矿）层厚度计算公式的可靠性及其数学的严谨性.  相似文献   

小型蒸发器蒸发量测定为负值的原因   总被引：1，自引：0，他引：1  

郝梅 《广东气象》2005,(3):48-48

在小型蒸发器蒸发量的观测过程中,有时因一些不明原因,致使蒸发量测定值成为负值。小型蒸发器蒸发量计算公式为蒸发量=原量+降水量-余量,由此可直观看出小型蒸发器蒸发量若为负值,只有一个原因,那就是小型蒸发器的原量+降水量<蒸发余量。现就这一原因进行分析。(1)因小型蒸发器与蒸发专用雨量器构造不同、安装位置不同,对降水量测量结果的减少存在重要的影响。小型蒸发器为口径20 cm、高约10 cm的金属圆盆,受水界面较为单一;而蒸发专用雨量器是由全新不锈钢的口径为20 cm的承水器(漏斗)、储水筒、储水瓶几个部件组成,承水器与漏斗连接面不是…  相似文献   

气候大陆度计算公式     

郑国光 《广东海洋大学学报》1986,(1):115-118

决定气候大陆度的方法很多。过去，有的由气温、气团决定，有的由湿度和雨量或者由它们的综合等等方法决定。本文是由辐射平衡推导得出气候大陆度计算公式。本方法决定的气候大陆度与过去的方法相比，优点在于使用简单方便，应用范围较广，并能自然地消除地理纬度对气候大陆度的影响。  相似文献   

干扰井群渗透系数计算的简便公式     

胡云峰  李万月 《青海国土经略》1994,(1)

干扰井群渗透系数计算的简便,公式是依据雅可布公式,根据叠加原理建立的。克服了计算方法烦杂,需解诸多未知数和使用范围窄及图解法计算时人为的随意性。增加了计算结果的可靠性。  相似文献   

对新的全国地震区划中概率计算公式表达的讨论     

陶夏新 《世界地震工程》1992,(2):33-36

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变接触压应力下MSM-DSSI支座滞回性能研究     

祁皑  杨绵越  王立志  陈永健 《地震工程与工程振动》2022,42(2):32-41

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