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mass depth
相关语句
  质量深度
     An Empirical Expression of Mean Mass Depth ■ of X-Ray in EPMA
     X射线平均质量深度■的经验表达式
短句来源
     The sedimentation rate, which was average 0.13±0.01 g/cm 2 .a, was stable in the Bosten Lake by analysing the mass depth and ages.
     通过质量深度与年代分析 ,博斯腾湖的沉积速率相对稳定 ,平均沉积速率为 0 .13± 0 .0 1g/cm2 .a。
短句来源
  相似匹配句对
     Mass.
     Mass .
短句来源
     Depth Resolution of Secondary Ion Mass Spectrometry
     二次离子质谱的深度分辨本领
短句来源
     CHAOTIC PREDICTION METHOD OF ROCK MASS DEFORMATION IN DEPTH
     深部岩体变形的混沌预测方法
短句来源
     On the “In-Depth-Report”
     浅谈“深度报道”
短句来源
     THE APPLICATION OF MASS
     折合质量的运用
短句来源
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  mass depth
This method nullifies perturbations due to the passage of mass depth during downward continuation.
      


This article mainly introduces a method for measuring the perturbation correction factor ofthe thumb chamber in a graphit phantom by means of varying the volume of cavity of the chamber andusing linear extrapolation method.A set of ionizing chambers,which have the same shape and outer di-ameter(the effective cavity volumes 0.4923,0.6832,0.9060,1.2092,1.4713 and 1.8818cm~3 re-spectively),were placed by turns in graphite phantom with mass depth of 5.13 g/cm~2 and irradiated bycollimated beam of ~(60)Co gamma...

This article mainly introduces a method for measuring the perturbation correction factor ofthe thumb chamber in a graphit phantom by means of varying the volume of cavity of the chamber andusing linear extrapolation method.A set of ionizing chambers,which have the same shape and outer di-ameter(the effective cavity volumes 0.4923,0.6832,0.9060,1.2092,1.4713 and 1.8818cm~3 re-spectively),were placed by turns in graphite phantom with mass depth of 5.13 g/cm~2 and irradiated bycollimated beam of ~(60)Co gamma rays.The charge per unit mass,J_a,in the cavity for chambers of dif-ferent volume was measured and used for extrapolation from volume v to zero so that to find the per-turbation factor k_p(?)as function of the volume and then the regression equation of k_p=a+bvThe obtained k_p can be used for the perturbation correction in the measurement of absorbed dose in thegraphit phantom with thumb chamber.

本文主要介绍用改变空腔体积的直线外推法测量指形石墨电离室在石墨模体内的扰动修正因子 k_p 的方法和结果。采用一组形状和外径(φ=13.5mm)完全相同、空腔有效体积υ分别为0.4923、0.6832、0.9060、1.2092、1.4713和1.8818cm~3的6个指形石墨电离室,放置在距离模体表面深度 h为5.13g/cm~2的石墨模体内,在准直~(60)Co γ射线束照射下,测量了空腔内单位质量空气中的电离电荷 J_(?)随υ的变化曲线;由该曲线外推得到υ=0时的 J_a 值,即(J_a)_0;再求得 k_p=(J_a)_0/(J_a)_v)值及其随υ的变化曲线。得到回归方程为 k_p=1.000—8.24×10~(-3)υ。所得 k_p 值,可用于指形石墨电离室测量石墨模体内吸收剂量时的扰动修正。

Lake sedimentation is a large pool for past global change. Carbonate geochemistry as an index has interested many scien-tists , and can provide a variety of high-solution information on short-or long-term climatic or environmental changes.Through detail comparison of profile of carbonate concentration and CaO/MgO·A12O3 ratio in the core which is calibrated according to mass-depth from varve-counting dating with recent annual average temperature data we find that the agreement between the two cuvyes...

Lake sedimentation is a large pool for past global change. Carbonate geochemistry as an index has interested many scien-tists , and can provide a variety of high-solution information on short-or long-term climatic or environmental changes.Through detail comparison of profile of carbonate concentration and CaO/MgO·A12O3 ratio in the core which is calibrated according to mass-depth from varve-counting dating with recent annual average temperature data we find that the agreement between the two cuvyes is astonishingly good, meanwhile, average molal ratio of CaO and CO2 in the sediments is nearly 1:1, this suggests that almost all carbonate minerals are calcite, which contains many climatic and hydro chemical information. They probably refect the relationship between calcite precipitation and climate change.According to calcite phychemical equibrium of pore water at the sediment-water interface during early diagensis process, we calcuate the Fd (carborate loss flux due to dissolution and upward diffusion at the interface) and Fs (calcite sedimentary flux). We define r as carborate perturbative extent at the interface:r = Fd/Fs (1)r is about 17%, we, therefore, can conclude that calcite unsaturated dissolution and perturbative process at the sediment-wa-ter interface is very small, much smaller than we imagine before.The paper finally suggests that carbonate concentration and CaO/MgO·Al2O3 ratio can be used as a high-solution temper-ature index in recent lake sediments.

本文通过红枫湖纹理沉积物柱芯碳酸盐特征剖面与流域气温资料对比、沉积纹理年代校正以及早期成岩化学过程对碳酸盐沉积记录的改造作用等方面的研究,表明湖泊碳酸盐沉积记录基本不受早期成岩作用的影响,碳酸钙含量和CaO/MgO·Al_2O_3比值可作为湖泊沉积物中具高分辨率、短时间尺度的气温变化的代用指标.

Clinothem slope facies is very advantageous to development of source rock of marine facies in the western margin of Ordos Basin According to the element geochemical characteristics,the relationships between element geochemistry and sedimentary environment,and the relationships between the distribution of source rock and heat flow of ocean floor are discussed in this article by the numbers through analyzing the rules of element concentrate and transference and the change of sedimentary water mass and oxidation...

Clinothem slope facies is very advantageous to development of source rock of marine facies in the western margin of Ordos Basin According to the element geochemical characteristics,the relationships between element geochemistry and sedimentary environment,and the relationships between the distribution of source rock and heat flow of ocean floor are discussed in this article by the numbers through analyzing the rules of element concentrate and transference and the change of sedimentary water mass and oxidation reduction condition on the different horizons and the different areas The conclusion is that water mass depth and reduction and biocoenosis and the heat flow of ocean floor are very important to the development of source rocks In the Zhuozishan Formation on the north of the western margin and Sandaogou Formation on the south of the western margin,the preservation of organism is very difficult,because during their deposition,the water mass was very shallow and widen,and the reduction was weak In the Kelimoli Formation and Wulalike Formation on the north of western margin and the first section of Pingliang Formation on the south of the western margin,the abundance of organism is very high,because during their deposition the water mass was very occlusive and the reduction was very strong,also heat flow of the ocean floor was very active These analyses provide the basement of element geochemical characteristic for evaluating the reservoir of the gas

鄂尔多斯盆地西缘斜坡相沉积是海相烃源岩的有利发育区。本文从元素地球化学入手 ,结合岩石、古生态特征 ,通过不同地区、不同层位元素赋存与迁移规律、沉积水体的变化及氧化 -还原条件的分析 ,系统探讨了该区奥陶系元素地球化学与沉积环境、烃源岩分布及海底热流体活动的关系。认为水体深度、还原性、生物量及海底热流体的存在是海相生烃岩发育的重要条件。西缘北段桌子山组及南段三道沟组等台地相沉积及其以下地层 ,其沉积水体浅、开阔 ,还原性差 ,使有机质难以保存 ,不利于生烃岩的发育 ;而北段克里摩里组、乌拉力克组及南段的平凉组第一段等斜坡相沉积 ,其水体深而闭塞 ,还原性强 ,并且存在海底热流体活动 ,可形成有机质丰度较高的海相生烃岩。从而为评价该区奥陶系天然气成藏条件 ,提供了地球化学依据

 
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