侵蚀

Test research on the concrete resistance to chemical attack was conducted under different salt and acid attack condition.

对普通混凝土在各种盐类、酸类侵蚀介质作用下的抗化学侵蚀性进行了试验研究，测定了混凝土的侵蚀破坏率和混凝土中的氯离子含量。

It shows through the calculation of topographic shaping of typical regions and channel shaping of the river system of the middle Yellow River and preliminary analysis on interrelationship with gravity erosion that it is feasible to reflect the integrated factor of topography and geomorphy...

对黄河中游典型区域地形分形和河网沟道分形的计算及其与重力侵蚀相互关系的初步分析表明：通过分形来反映流域地形地貌综合因素是可行的；地形分形与重力侵蚀的关系较为紧密，可以用于重力侵蚀的宏观预测；河网分形与重力侵蚀的关系较弱。

The unstructural knowledgeof soil erosion in Guizhou Province was concluded,which is the basis of studying the primaryand the senior methods of interpreting soil erosion message in Guiozhou based onunstructural knowledge.

搜集、分析了贵州省有代表性的17个小流域土壤侵蚀和土壤侵蚀影响因子的相互关系，总结出了贵州山区土壤侵蚀的非结构性知识，为进行基于非结构性知识发现的土壤侵蚀信息提取初级和高级方式研究奠定了知识基础。

In the dissertation,Guizhou Province andGuiyang.Guizhou Province were selected as the research area and the model region.With theguidance of knowledge discover in database and soil erosion theory,remote sensing and GISwere used to study the senior and the primary method of obtaining the soil erosion message,which are based on unstructural knowledge discover in database.All the methods wereapplied to survey the soil erosion in Guizhou and to monitor the soil erosion change inGuiyang,all of the achievements enhanced the water-soil conservation in the research areaand the model region.

本文在知识发现和土壤侵蚀理论指导下，应用遥感和地理信息系统技术，选择贵州省为研究区，贵州省贵阳市为研究样区，进行了基于非结构性知识发现的土壤侵蚀信息提取方法初级方式和高级方式的研究，并把它们应用到研究区和研究样区的土壤侵蚀调查和土壤侵蚀动态监测工作中，促进了研究区的水土保持工作。

MgO-C brick has a good erosion resistance but Al〓O〓-C brick is better. Corrosion mechanism for refractory without carbon is that FeO and oxides of molten slag take place chemical reaction with constituents of refractory and forming low fusing point compounds to be dissolved in molten slag. For those refractory containing graphite carbon is to be decarburized in advance and to form decarburizing layer and metamorphosis layer. The subsequent corrosion is decarburizing and taking chemical reaction to form low fusing point compounds and dissolved in molten slag at the same time.

铁浴中硅和钛的扩散是影响铁浴及熔渣与耐火材料作用的重要因素，耐火材料中添加的TiO〓和SiC受熔渣氧化和侵蚀，将被部分还原形成Si，Ti向铁浴中扩散，Si、Ti在铁浴中的扩散研究结果是： D〓=1.84×10〓exp（－5988.7/T） cm〓/S E〓=49766 J/mol D〓=7.76×10〓exp（－53225.5/T） cm〓/S E〓=442304 J/mol 铁浴式熔融还原熔体对粘土砖，高铝砖，镁砖的侵蚀速度很高，镁碳砖抗侵蚀能力比前几种耐火材料强，但不如铝碳砖；对不含碳耐火材料在熔体中的侵蚀是熔渣中FeO及其它氧化物与耐火材料组分的化学反应形成低熔点物熔蚀进入渣相，产生损毁。

In the other hand, graphite carbon and SiC oxidizing produce CO、SiO〓 and in the same time CO separates graphite carbon partially, this effect will decrease decarburizing rate and corrosion rate for Al〓O〓-SiC-C brick. TiO〓 and SiO〓 protective layer forming and separating graphite carbon are the main factor of resistance smelting reduction molten slag-iron to corrode and the main feature of corrosion process.

Al〓O〓-C-SiC砖在侵蚀过程中，由于SiC氧化后产生CO，SiO，并析出碳和降低耐火材料气孔率及氧化形成的SiO〓成为保护膜，使熔体对耐火材料的侵蚀能力降低，这两种耐火材料的侵蚀速度都是随着使用时间延长，耐火材料侵蚀速度逐渐降低。

The results show that an internal and mutual transformation of land-use types cause striking changes in soil erosion extent. The transition of cultivated land to woodland and grassland medicates erosion intensity, and the one from forestland to cultivated land and grassland aggravates erosion. In addition, land-use practices, including mainly human activities, have impacts on the content of suspended sediment.

研究表明，本区土地利用类型的内部转化和相互转化引起土壤侵蚀程度的明显变化；耕地向林地、草地的转化使侵蚀强度指数显著降低；林地向耕地、草地转化，均显著增加侵蚀强度指数；耕地、林地、草地的内部转化对土壤侵蚀也有少量影响。

The test result of a sulphate resistance agent for the concrete used on canal system is introduced herein.

介绍了一种用于渠系混凝土的抗硫酸盐侵蚀剂的室内试验研究结果，试验内容包括单纯硫酸盐条件下的侵蚀试验、硫酸盐结合C l-和Mg2+条件下的侵蚀试验以及干缩循环条件下的侵蚀试验。

The main contents are as follows:Firstly, starting with the general situation of soil erosion and the harms caused by it, the causes leading to the local soil erosion problem are analyzed comprehensively in the paper. And connecting with the measures taking place, sticking points towards the career of soil and water conservation are expatiated upon.Secondly, Back-Propagation Neural Network, One of Artificial Neural Network is used to set up a modal about the connection of the soil erosion modulus and seven factors impacts on it, such as, rainfall, rainfall largest intensity in 30 minutes, runoff coefficient, vegetation cover percent, rate of granule, rate of physical viscidity-clay, the rate of organic matter. Through the comparison with linear regression model, the second regression model, the Chinese Soil Loss Equation, it illustrated that BP Neural Network modal is more accurate than the other three modals in forecasting the mount of soil erosion, and the BP Neural Network will have some applicability in forecasting in soil erosion.

本文以霍山县作为皖西大别山区的典型区域，主要研究了以下内容：(1)从介绍霍山县土壤侵蚀状况以及所造成的危害入手，全面分析了导致当地土壤侵蚀发生的原因，并结合当地采取的水土保持相关措施，阐述了当地水土保持工作的症结所在；(2)结合上土市水土保持试验站多年实测资料和2005年实验资料，应用BP神经网络理论，建立了次降雨土壤侵蚀量与次降雨量、最大30min雨强、径流系数、植被覆盖度等因子之间关系的模型，并通过BP神经网络的预测模型与一次回归模型、二次回归模型、CSLE模型之间的对比分析，说明了建立的BP神经网络模型在土壤侵蚀预测可以取得较回归模型和CSLE模型更高的精度，也说明了BP神经网络理论在土壤侵蚀预报中具有一定的适用性。

The result showed that tectonic movement history was a key factor in the deep weathering mantle formation. Tectonic movement influenced driving force and potential energy of Benggangs, and eroded history of each cracking block, which determined the depth of weathering mantle.

结果表明：构造活动历史是崩岗区形成深厚风化壳的主导因素；构造活动影响崩岗侵蚀动力势能以及各断块遭受侵蚀的历史；侵蚀动力势能和侵蚀历史确定了崩岗发育之前风化壳的厚度。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。