Using Long-Period Body Wave to Inverse Moment Tensors of the M_S6.8 Jiashi,Xinjiang Earthquake in 2003 and the Moderate and Small Earthquakes before and after It

An Ms6.8 strong earthquake took place in Jiashi, Xinjiang on February 24 of 2003. The digital wave form data recorded in Kashi and Wushi stations are selected to inverse the moment tensor solutions for the strong earthquake and the moderate and small earthquakes before and after it （ 108 earthquakes in 2001 - 2004）. 67 focal mechanism solutions have been calculated, and the results agree with those from Harvard University and USGS. The analysis reveals that before the strong earthquake, the moderate and small earthquake distribution was dispersed, and after the event the distribution was mainly concentrated around the strong earthquake. Before the strong earthquake, the seismic faults of the mid and small events had the character of strike-slip and normal faulting, and after the event, they exhibit strike-slip and thrust faulting. The region is dominated by near-NS horizontal compression from the southern block after the strong earthquake.     

秦岭地区蚀变煌斑岩型金矿的发现及金的预富集研究

秦岭地区煌斑岩广泛分布,大部分蚀变煌斑岩型金矿发现于微成盆地南侧。本文对煌斑岩金的预集提出了认识,深入研究蚀变煌斑岩型金矿中金的预富集和成矿特征有望扩大在秦岭地区的找金前景。     

广西1999年度气候特点及其影响评价

分析广西1999年度（1998年12月至1999年11月）的气候状况,其特点为：各地年平均气温17.3～23.8℃,比常年偏高0.5～1.3℃;有49个县市（占56%）气温异常偏高,有25个县市（占29%）气温显著偏高;全区年平均气温21.2℃,比常年偏高0.8℃,与1998年并列为广西自1959年以来第2暖年。年降水量为928～2399mm,与常年相比,桂北正常到偏多3成,桂南正常到偏少2成。年日照时数1060～2362h,大部地区比常年偏少50～300h。主要气候事件及其影响以大范围长时间冬春连旱最为突出,其次是汛期局部暴雨洪涝。1999年度气温异常偏高,降水接近常年,日照稍少,冬春连旱严重,对农业生产的影响利弊同存,属正常偏好年景。     

陕西南部含钾岩石的分布特征与找矿方向讨论

在对陕西南部区域地质背景分析的基础上 ,通过对研究区含钾岩石分布特征的初步研究认为 ,本区含钾岩石均围绕地台与地槽边缘分布 ,可划分为碎屑岩型、火山熔岩型、正长岩型、伟晶岩型 4种类型。含钾岩石开发的前景在于 :加强试验研究、综合找矿、综合评价。     

Space–time changes in hydrological processes in response to human activities and climatic change in the south China

Due to the influence of climate change and human activities, more and more regions around the world are nowadays facing serious water shortages. This is particularly so with the Guangdong province, an economically prosperous region in China. This study aims at understanding the abrupt behavior of hydrological processes by analyzing monthly precipitation series from 257 rain gauging stations and monthly streamflow series from 25 hydrological stations using the likelihood ratio statistic and schwarz information criterion (SIC). The underlying causes of the changing properties of hydrological processes are investigated by analyzing precipitation changes and information of water reservoirs. It is found that (1) streamflow series in dry season seems to exhibit abrupt changes when compared to that in the flood season; (2) abrupt changes in the values of mean and variance of hydrological variables in the dry season are more common than those in the streamflow series in the flood season, which implies that streamflow in the dry season is more sensitive to human activities and climate change than that in the flood season; (3) no change points are identified in the annual precipitation and precipitation series in the flood season. Annual streamflow and streamflow in the flood season exhibit no abrupt changes, showing the influence of precipitation on streamflow changes in the flood season. However, streamflow changes in the dry season seem to be heavily influenced by hydrological regulations of water reservoirs. The results of this study are of practical importance for regional water resource management in the Guangdong province.     

Reconstruction of the climate in the Tianmu Mountain area,Zhejiang Province,in the last 160 years by σ<Superscript>13</Superscript>C sequence of tree ring α-cellulose

Based on cross-dating tree rings from the Tianmu Mountain, Zhejiang Province, the tree rings α-cellulose σ¹³C time series was measured. By spectrum analysis, the variation of tree-ring σ¹³C sequence shows a quasi periodicity of 4.4 years, which is coincident with the standard cycle of El Niño. After removing the long-term decrease trend of the σ¹³C variation related to atmospheric CO₂ concentration, the response of the σ¹³C to climate elements was analyzed using meteorology data from a nearby weather station. The results suggest that there is a distinct relativity between high-frequency variation of tree ring σ¹³C series and seasonal climate parameters, e.g. temperature and precipitation, with a significant time-lag effect. In addition, the high frequency also reflects the strength change of the East Asian Monsoon. The multiple regression method was employed to reconstruct the historical climate, and to analyze the climate change and trend in the last 160 years in the northern Zhejiang Province.     

非平衡动力学中恒星结构稳定性研究

采用非平衡动力学方法研究由CNO循环决定的恒星结构稳定性,本文得出:CNO循环自身是稳定的;扩散效应不会改变处于稳定的恒星结构稳定性;对流效应对其稳定性有重要影响,波数小的扰动更容易激发不稳定性;巨大的温度梯度也能激发不稳定性。本文给出了稳定性条件和恒星结构保持稳定所允许的最小扰动波数。     

湖北经济的空间结构及发展布局模式

本文论述了区域空间结构的构成要素和形成基础,分析了湖北省经济空间结构的现状、特征,并提出了其经济空间结构发展的模式。     

河北大湾锌矿中硫锰矿与闪锌矿的成因关系

本文研究了产于河北大湾锌矿床中的硫锰矿,探讨了硫锰矿与闪锌矿的成因关系。由实验结果而认为大湾硫锰矿是从深色高锰闪锌矿中出溶而成的。     

大气边界层的数值模式

从大气边界层温湿特征的模拟,讨论模式的设计和处理。模式计算所得位温,混合比垂直廓线和混合层厚度等随时间变化基本反映实际大气边界层的一些特点。并从地气之间热量收支、土壤热传导方程出发计算地面温度日变化。利用Clarke的Wangara资料计算了24小时内它们的变化,并与观测值进行比较。本文还对温湿预报方程的数值解的稳定性进行了讨论。