查询词典 loess

In this paper, collapse characteristics of intact loess from three typical loess areas under different moisture condition are studied,and the principles of loess collapsibility influenced by water content,dry density as well as pressure and behaviors of these in different loess are approached respectively.

对 3个典型黄土地区的原状黄土样在不同湿度状态下的湿陷特性进行了研究，探讨了含水率、干密度、压力对黄土湿陷性的影响规律，着重从结构性的角度解释了不同地区间黄土湿陷特性的差异。

The results show the mineral taxa, morphological characteristics and the high contents of magnetite and dens revealed the multi-sources and near-derived features of the loess-like loess in Zhifu Island, and the main sources of loess are seabed plain, diluvium and residual sediments in the last glacial period, while thin sediments from Northwest inland desert are rare.

结果表明，芝罘岛黄土状黄土矿物种类、矿物形态特征、磁铁矿和岩屑的高含量等都揭示了黄土来源的多源性和近源性，末次冰期时的海底平原沉积物以及洪积、残积物是芝罘岛黄土状黄土的重要物源，而西北内陆沙漠吹来的细颗粒物质相对较少。

So the systematically study of loess landslides are emergently needed. Based on detailed investigation and survey of characteristics of environmental geology, engineering geology, hydrometeorology in Tongchuan, the distribution characteristic and the outer, inner factor of loess landslides are studied; and it is concluded that the rainfall and artificial engineering activity are the leading causes of loess landslide among various factors. Through plenty of tests of soil samples, it is researched that the loess"s physical mechanics characteristics, the loess landslide"s formation mechanism and kinematics mechanism.

本文在详细调查和勘察铜川地区的环境地质、工程地质及气象水文特征的基础上，对黄土滑坡的分布特征和滑坡形成的内外因素进行了深入剖析，认为在各种影响因素中，大气降水和人类工程活动是铜川黄土滑坡的最主要的诱发因素；在采集大量的土样并进行试验的基础上，对黄土的物理力学特征和黄土滑坡形成机理、运动学机理进行了研究，推导出了滑坡运动机理中的孔压参数A_D、B_D分别与孔隙比和饱和度的统计关系。

During the Last Interglaciation it was the forest, mainly composed of broadleaves, or forest-grassland at the east and middle part of the Chinese Loess Plateau, and was the forest-grassland at the west part of the Chinese Loess Plateau. It changed to the forest or forest-grassland at the most part of the Chinese Loess Plateau in the Holocene, some kinds of hardwood broadleaves dispersing at the warm temperate and the tropic zones appeared. Now the vegetation at the Chinese Loess Plateau inherits from that during the Holocene, the vegetation have been heavily destroyed owing to the human being actions. The vegetation protection at the Chinese Loess Plateau is a significant problem.

末次间冰期期间气候温暖湿润，黄土高原的中、东部地区主要发育了以落叶阔叶林为主的森林或森林草原植被，黄土高原西部地区主要发育的是以针叶林为主森林草原植被；全新世期间黄土高原的植被状况发生较大变化，黄土高原的大部分地区为森林植被或森林草原植被，植被中还有暖温带落叶阔叶林，并含有少量亚热带种属；现代黄土高原的植被主要还是继承了全新世以来的植被状况，但是由于人类活动的加剧，对黄土高原的植被产生了毁灭性的破坏，因此，如何保护黄土高原的自然植被是我们面临的一个严峻的现实问题。

The result of factor analysis can provide the changes of relative precipitation and temperature variations. In trace elements, Cu, As, Zn, Pb and Ni were apparently enrichmented in soil layers and are sensitive to climatic changes. Carbon isotope is more sensitive to climatic changes than that of oxygen isotope in loess stratigraphy. The heavy mineral are varified in the loess stratigraphy, but their content differences between loess and palaeosol is little. Though the palynologic analyses results reveal that pollens and spores are fewer in the loess stratigraphy, they differ greatly in loess layer and palaeosol layer not only in species but also in types, i. e., the pollens and spores indicating warm and moist climate, such as Lles, Podocarpus, Polopydium, Pteris grerilliana Wall, Pterocarya and Juglans appear in palaeosol layers, while those indicating cold and dry climate such as Ephedra, Artemisia, Chinopodiaceae, Picea and Abies exist mainly in loess layers. The pollen content of broad-leaved tree mainly consisting of Pterocarya is up to 60% in palaeosol 〓, while the content of Ephedra is more than 50% in 〓 loess layer, showing that the environment differed greatly when 〓 and 〓 were formed.

当然，常量元素氧化物的组合因子分析结果可提供相对降水与相对温度在剖面的变化，因而来反映气候状况更为理想；微量元素中Cu、As、Zn、Pb与Ni在成土过程中富集明显，亦较好地反映了气候变化；稳定同位素中的碳同位素比氧同位素更能敏感记录气候的变化；研究区黄土地层中重矿物种类较多，但黄土层与古土壤层中含量差异不大；孢粉分析结果揭示，尽管研究区黄土层中孢粉总量相对较为贫乏，但黄土层与古土壤层中孢粉种属相差较大：在古土壤层内出现了指示相对暖湿环境的冬青属、罗汉松属、水龙骨属、林下凤尾蕨、枫杨、胡桃等植物孢粉，而黄土层中麻黄、藜科、蒿属及冷杉、云杉含量较高。

Loess a company's existing quarry, a processing plant, Machinable Loess stone wall and floor tiles, mosaics, loess powder, and other stone products loess.

公司现有一座黄土石矿，一个加工厂，可加工黄土石墙地砖，马赛克，黄土石粉，其他黄土石产品。

RESULTS: The currently implemented functions were based on limma and affy package from Bioconductor, the spacings LOESS histogram method, PCA-assisted normalization method and genome mapping method.

结果：当前实现的功能是基于来自Bioconductor的limma和affy包，间隔LOESS直方图方法，PCA-辅助的归一化方法和基因组mapping方法。

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。

Hilly gullied loess region, the main body of Loess Plateau, is also an eco-economic sensitive area with special landscape pattern. Being an ecological fragile and economically underdeveloped region, environment protection and economic development remain to be double tasks it expects to solve simultaneously.

中文题名黄土高原丘陵沟壑区小流域优化生态－生产范式副题名外文题名 Optimized eco-productive paradigm for small watersheds in hilly gullied Loess Plateau 论文作者孔正红导师张新时院士学科专业生态学研究领域\研究方向学位级别博士学位授予单位中国科学院植物研究所学位授予日期2002 论文页码总数143页关键词农业生态系统优化生态－生产范式小流域黄土丘陵沟壑区馆藏号BSLW /2003 /Q948 /26 黄土丘陵沟壑区是黄土高原的主体部分，也是具有特殊景观格局的生态-经济敏感区。

According to the four highway engineering geological subarea of the loess region, based on a great deal of indoor experiments and existing engineering data, the main physical and mechanical property index of each loess area were re-counted, and the district variational regulation of the loess physical and mechanical property were studied in order to get the characteristic parameter of the loess soil property index providing precious foundation data for the highway engineering construction of the loess region.

本文按照黄土地区的四个公路工程地质分区，以大量的室内试验和已有工程资料为基础，重新统计了各区黄土的主要物理力学性质指标，研究了黄土物理力学性质的区域变化规律，得出黄土土性指标的特征参数，为黄土地区的公路工程建设提供了宝贵的基础资料。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。