SUSTAINABLE DEVELOPMENT OF THE SERIOUSLY POLLUTED CITIES IN CHINA——Taking Benxi City as an Example

Ｉ．ＩＮＴＲＯＤＵＣＴＩＯＮＣｉｔｉｅｓａｒｅｔｈｅｓｙｍｂｏｌｓｏｆｈｕｍａｎ’ｓｃｉｖｉｌｉｚａｔｉｏｎ,ｔｈｅｓｐａｔｉａｌｃａｒｉｅｒｓｏｆｅｃｏｎｏｍｙａｎｄｔｈｅｓｏｕｒｃｅｓｏｆｒｅｇｉｏｎａｌｅｃｏｎｏｍｉｃａｃｔｉｖｉｔｉｅｓ（Ｇｕ...     

Soil evolution features of debris flow waste-shoal land

The reclamation and utilization of debris flow waste-shoal land plays an important role in the mitigation and control of debris flow hazards, which thus contributes a lot to the exploitation of insufficient land resources in mountainous areas and the reduction of losses caused by debris flow. The aim of this paper is to discuss the features and mechanism of soil evolution of debris flow waste-shoal land so as to search for the available modes of its reclamation and utilization. The Jiangjiagou Ravine, a typical debris flow ravine, was selected to study soil evolution features of debris flow waste-shoal land based on the analysis of soil physieochemical properties and soil microstructure. It was found that the soil evolution rates of debris flow waste-shoal land varied with different modes of reclamation. For the land which had been reclaimed for less than lO years, soil evolved most rapidly in paddy fields, and more rapidly in dry farmland than in naturally restored waste-shoal land. For the land which had been used for more than lo years, the soil evolution rates of dry farmland, naturally restored waste-shoal land and paddy farmland decreased in the file. For the same utilization period of time, significant differences were recognized in soil evolution features under different modes of reclamation. Analysis data showed that soil clay content, soil thickness, the psephicity of skeleton particles and contents of microaggregates （〈0.02 mm） in paddy farmland were all highest. Soil nutrients and porosity of dry farmland were better than those of paddy farmland and naturally restored waste-shoal land, and those of paddy farmland were superior to those of naturally restored waste-shoal land. Paddy farmland characterized by rapid pedogenesis, stable evolution and high utilizability was the priority candidate for the reclamation and utilization of debris flow waste -shoal land.     

�Ľ��¶ȵ�LiDAR������̬ѧ�˲��㷨

????????????????д????????ò???????????????????????????ε??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????硢??????????????????Ч??????????????????????????????????????????С??     

Sedimentary macro-structures and forming mechanism of debris flow

IIWr~IOWThesedimentarycharacteristicsofdebrisflowcanreflectthecompoSition,fluidtypeandsedimentaryprocess.ThescholarswhostudymoderndebrisfloWinChinagenerallyclassifydebrisflowbythemethodofviscositywithfloWpattern.SeveraltypicalschemesareshowninTable1,inwhichthemethodofunitweight(fluiddensityinunitvolumet/m3)isusedandfluidunitweightisthoughttobethedirectproPOSitiontotheviscosityofdebrisflow(Wu,1990).Ithasbeenprovedbyhydrcrmechacsthatnon-cohesivedebrisf1OwfollowsBagnoldgranular'flowmedel(B…     

The generation and its sealing condition of natural gas in the Tadong area

Focusing on the two natural gas exploration geological problems with abundant source of oil cracking gas in the late stage and the sealing condition of the oil cracking gas reservoir, the kinetics of oil cracking gas and the evaluation parameters of gas cap rock are adopted to the study on the natural gas accumulation conditions in the Tadong area. Both the study on the kinetics of oil cracking gas and the statistical results of reservoir bitumen reveal that the geological formation of oil cracking gas in the Tadong area is located in the top of Cambrian. Two kinds of oil cracking gas geological models at least, namely well Mandong-1’s early rapid generation model (Middle Ordovician-end Silurian) and peak cracking model (with the natural gas conversion rate >90%), namely well Yingnan-2’s two-stage generation model of oil cracking gas, have been set up. The oil cracking gas of Yingnan-2 in the late stage is very significant in the evaluation of natural gas exploration in the Tadong area. The evaluation results of the cap rock show that the microscopic parameters of cap rock from the lower assemblage of Cambrian-Ordovician are better than those from the upper assemblage. The former has strong capillary sealing ability and higher cap rock breakthrough pressure than the upper assemblage, with strong sealing ability, so that natural gas dissipates mainly by diffusion. According to the above investigations, the lower assemblage Cambrian-Ordovician natural gas of Kongquehe slope, Tadong low uplift and Yingjisu depression in the Tadong area prospects well.

     

超高压变质作用研究现状及问题

本文从超高压变质作用的矿物学、Ｐ－Ｔ－ｔ轨迹和超高压地体抬升、保存机制三个方面总结了近年来超高压变质作用研究所取得的重要进展和存在的问题。超高压变质作用的矿物学研究正在向深入发展，其Ｐ－Ｔ－ｔ轨迹具有三种成因类型。而其超高压地体的抬升、保存机制则是争论的焦点，其中增生楔模式（Ｐｌａｔｔ，１９８７）和连续俯冲─仰冲机制较好地解释了抬升过程，但也存在一些问题需进一步研究。     

Dynamic characteristics of shear buildings on laminated rubber bearings

Analytical solutions are derived for the dynamic characteristics of base-isolated shear buildings supported on laminated rubber bearings. The solution process takes into account the combined effects of the superstructure flexibility and the base raft inertia on the dynamic characteristics. A series of parametric studies is carried out and the effects of varying the stiffness and mass of the base-isolation system on the frequencies and mode shapes are identified. Approximate solutions for the fundamental base-isolated frequency and mode shape are obtained, which are suitable for use in the preliminary design of non-rigid base-isolated buildings.     

对西秦岭拉尔玛地区太阳顶群进一步划分的意见

太阳顶群是一套黑色含碳硅质碎屑岩系，化石贫乏。笔者１９８８年在拉尔玛地区该群拉尔玛组上部发现有ＣｙｌｉｎｄｒｏｃｈｉｔｅｓｄａｉｚｎｕａｎｇｚｉｅｎｓｉｓＬｉｕ和ＨｙｏＬｉｔｈｅｌｌｕｓｑｉｎｇｈｅｅｓｉｓＬｉｕ等微体小壳化石，分别相当于陕西宁强、湖北房县、四川峨嵋麦坪和云南昆明梅树村产的Ｈｙｏｌｉｔｈｅｓｓｐ。和Ａｕａｂａｒｉｔｅｓ－Ｃｉｒｃｏｔｈｅｃａ化石组合，是下寒武统底部梅树村阶的标准带。根据微体小壳化石组合和岩性特征，将原太阳顶群拉尔玛组的上部，以铁质条带硅质板岩风化壳为标志的沉积间断为底界，时代定为下寒武统。将拉尔玛组中下部以下地层，时代定为上震旦统。     

云南元谋干热河谷土地退化及其防治对策*

本文探讨了云南元谋干热河谷土地退化的特点、分布及其危害,提出了加强基础教育、控制人口增长、改革耕作制度、继续农业基础设施建设、因地制宜发展林业和农业等于热河谷土地退化防治对策。     

网点印刷颜色再现物理模型

本文在讨论网点印刷呈色机理的基础上，提出四色版印刷时，用概率统计中的回归分析方法，修正Ｎｅｕｇｅｂａｕｅｒ方程，建立颜色再现物理模型。