现代沉积

Based on modern optimization theory and optimal control theory, this dissertation studies some questions as follows:1. The optimization model of parameter identification of three-dimensional geologic history numerical simulation, algorithm and its applicationGeologic history numerical simulation is a basic content of basin numerical simulation, and the porosity is the major parameter in the evolution and development process of oil-bearing basin. According to the sedimentation and burial mechanism, the physical and chemical principles of oil geology, the mudstone porositys non-linear parabolic partial differential equation has been established.

本文应用现代最优化及最优控制理论，对如下一些问题进行了研究： 1、三维地史数值模拟的参数辨识优化模型、算法及应用地史模拟是盆地数值模拟的一个基础性的研究内容，地层孔隙度是含油气盆地地史演化发育过程中的重要参数，根据地层沉积埋藏机理和石油地质的物理化学原理，通过引入数学物理方程概念，建立了泥岩三维孔隙度场方程，根据问题的特点，给出了方程的定解条件，对方程的动边界也给出了处理方法，并且证明了解的存在性与惟一性，在此基础上建立了以当今实测数据为拟合准则的三维地史数值模拟的参数辨识优化模型，这是一个含有二阶偏微分方程约束的泛函极值问题。

Influenced by the exterior source input of the detrital matters, U-series dating using aragonite is not suitable to the study of Lake Sugan sediment and a further study is required.2. The isotopes study of precipitation-groundwater-lake water system in Lake Sugan drainage area indicates that in modern climate system, the precipitation in Lake Sugan drainage area is mainly supplied by the water vapor carried by Westerly.

沉积物文石的铀系测年受到外源碎屑输入的影响，在苏干湖并不适用，需做进一步的研究。2、苏干湖流域降水-地下水-地表径流-湖水同位素系统研究表明，现代气候条件下苏干湖流域大气降水主要来源于西风环流携带的水汽输入。

The composition of Fe-Co and Fe-Co-Mn alloy is analyzed by using Electron Probe Micro Analysis and the magnetic properties of porous alumite film in which Fe-Co and Fe-Co-Mn alloy electrodeposited are measured by a Vibrating Sample Magnetometer .

本论文通过使用多种现代测试技术，如：扫描电镜、透射电镜、电子探针X射线能谱、X射线衍射、电子衍射分析和振动样品磁强测试等，对铝阳极氧化膜的形貌、纳米级微孔内Fe—Co和Fe—Co—Mn合金的晶体结构、Fe—Co和Fe—Co—Mn合金在纳米级微孔内的电沉积工艺以及纳米级微孔内Fe—Co和Fe—Co—Mn合金的磁性进行了系统的研究。

The large climatic gradient and diversity of habitats in China are ideal for the studies of testate amoebae biogeography, ecology, and paleoenvironmental reconstructions.

我国地域辽阔，生境多样，无论是开展现代有壳变形虫的生态学研究，还是沉积物中有壳变形虫记录的古环境重建，都有巨大的研究潜力。

The upper layer is modern river deposit; the middle layer is relative thick,mainly consisting of icewater deposit,colluvial deposit and deluvium as well as barrier dam accumulation; the bottom layer is formed by ancient river bed deposit and boulder rocks.

河谷覆盖层是由一套不同时期、不同成因类型的沉积物相互迭置的结果，由表及里宏观上可分为3层：表层为现代河流相堆积；中间主要为以冰水、崩积、坡积、堰塞堆积与冲积混合为主的加积层，厚度相对较大；底部主要为古河床的冲积、冰水漂卵砾石层。

On the basis of the distribution and sedimentation of disaccate pollen from recent coniferophyte, it is inferred that there were subalpine and middle mountains on the Jianhu Uplift during the Early Miocene, where Abies, Picea, Tsuga, etc.

现代山地针叶树的双气囊花粉的散布、沉积作用表明，中新世早期在江苏建湖隆起上，曾有亚高山、中山，其上生长着冷杉、云杉、铁杉等松科植物。

This is not surprising, given the closer proximity of Pengyang to the Asian inland dust sources; The average content of calcium carbonateis of Pengyang section is not only higher than that of central loess plateau, but also higher the west of Chinese Loess Plateau, which reflected Pengyang loess had been deposited by near Liupanshan\'s substances that contained more calcium carbonateis; The content of diffluent element of 10m depth in the section increased fast, which indicated that the modern eluviation and the leaching depth of loess may be stronger than our guess; The soil growth index can reflect the intensity of soil forming and the climatic changes; The "abrupt chang" of glacial and interglacial period was caused by strong soil-forming processes that enlarged the discrepancy of granularity between loess and paleosol. However, the magnetic susceptibility nearly cannot reflect the existence of S_8 and the magnetic susceptibility of S_7 is highest in the whole section, which is inconsistent with other studies that S_5 has the highest magnetic susceptibility.Thin-section examination shows that the micro-texture of the soil layers is divided into both cementing texture in S_7, S_5 and S_1, and granular texture in all others.

与其它剖面相比，彭阳剖面粒度总体上要比东部的洛川、西安，甚至西部的兰州、新疆东湾要粗；CaCO_3平均含量不仅高于黄土高原中部，也高于高原西部，反映出本剖面富含碳酸盐的六盘山近源沉积起到了很重要的作用；易溶元素含量在剖面10m处快速升高，淀积特征明显，反映出黄土受现代淋溶成土作用影响较大，黄土直立、疏松、多孔特性和高温与多雨组合的气候特点，使得元素淋溶、淀积的强度和深度超出了传统的认识和判断；烧失量与其它指标相比，不仅能区分冰期、间冰期；而且能够区分出次一级的冰阶、间冰阶，有较高的分辨率；土壤发育指数、红度能够反映土壤强度差异，是反映气候波动的较好指标；然而，磁化率不能反映古土壤S_8的存在，且S_7的磁化率在全剖面中最高，这与大多剖面S_5磁化率最高的特点不一致。4。

Study shows that environment evolution and eustatic change of Holocene in this area may be divided into 6 stages:① early stage of early Holocene, 9 100~10 900 aBP,when sea level was low and this area was an oxidizing environment or oxidizing-reducing transition environment;② late stage of early Holocene, 8 000~9 100 aBP, sea-level rising,...

研究表明，本区全新世环境演化分为6个阶段：①早全新世早期，10900~9100aBP，海平面较低，尚未淹没本区，为近岸氧化环境或氧化—还原过渡环境；②早全新世晚期，9100~8000aBP，海水上涨，本区时淹时退，为浅海或潮坪环境，生物钻孔发育；③中全新世主体，8000~4150aBP，海平面快速上升，完全淹没，Fe2+/Fe3+介于0.7395~1.9123之间，为全新世中最高段，表明还原程度强、全球气候变暖；④中全新世后期，4150~2850aBP，海水有所下降，仍为浅海环境，Fe2+/Fe3+较高，多在1.0以上；⑤晚全新世，2850~1310aBP，海平面进一步下降，本区时常暴露，其中2150~1310aBP以还原环境为主，为潮下带，2150~2850aBP以氧化—还原过渡环境为主，为潮间带；⑥1855AD以来，海平面基本稳定，稍有上升，为现代黄河三角洲沉积时期。本区全新世至少存在5期冷热交替的旋回性气候变化。

Several problems concerning karstic study of Majiagou limestone in area of North China are discussed in this paper.

讨论了华北地区奥陶系马家沟组灰岩（O2）岩溶研究中的几个问题，包括沉积岩溶、暴露岩溶、埋藏岩溶、现代岩溶及陷落柱等。

Many methods for sample preparation have been applied in stable isotope measurements of ostracode shells from lake sediments.

在总结目前常用的湖泊生物碳酸盐稳定同位素测试样品处理方法的基础上，通过对青海湖现代和古代沉积物中介形虫的测定，讨论各种处理方法对介形虫壳体稳定同位素测试结果(δ13C和δ18O)的影响。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新