神府煤田大柳塔矿区高分辨率地震勘探

利用高分辨率地震反射法，在地表沙丘、沙垅无规则分布的神府煤田大柳塔矿区为采掘巷道作业，勘探垂直断距２ｍ以上至５ｍ的断层分布。试验观测结果取得了良好的效果。     

The Relative Impact of Regional Scale Land Cover Change and Increasing CO2 over China

A series of 17-yr equilibrium simulations using the NCAR CCM3 (T42 resolution) were performed to investigate the regional scale impacts of land cover change and increasing CO2 over China. Simulations with natural and current land cover at CO2 levels of 280,355, 430, and 505 ppmv were conducted. Results show statistically significant changes in major climate fields (e.g. temperature and surface wind speed) on a 15-yr average following land cover change. We also found increases in the maximum temperature and in the diurnal temperature range due to land cover change. Increases in CO2 affect both the maximum and minimum temperature so that changes in the diurnal range are small. Both land cover change and CO2 change also impact the frequency distribution of precipitation with increasing CO2 tending to lead to more intense precipitation and land cover change leading to less intense precipitation-indeed, the impact of land cover change typically had the opposite effect versus the impacts of CO2. Our results provide support for the inclusion of future land cover change scenarios in long-term transitory climate inodelling experiments of the 21st Century. Our results also support the inclusion of land surface models that can represent future land cover changes resulting from an ecological response to natural climate variability or increasing CO2. Overall, we show that land cover change can have a significant impact on the regional scale climate of China, and that regionally, this impact is of a similar magnitude to increases in CO2 of up to about 430 ppmv. This means that that the impact of land cover change must be accounted for in detection and attribution studies over China.     

气举反循环钻深度的理论计算与加深试验

运用气举反循环钻进、在满足一定条件下适当增加双壁钻具长度即可得到较大钻进孔深，本文通过理论计算及实验，证实了使用现有设备，气举气循环可以更好的满足超午米深水井的施工要求。     

潮汐韵律层的研究进展及其天文地质意义

潮汐沉积物记录着一系列的潮汐周期。本文简要介绍了几种主要的现代潮汐周期，在此基础上回顾了最近十余年来国外对周期性潮汐沉积物，特别是潮汐韵律层的研究进展，系统介绍了几种从古代沉积物中识别出来的潮汐周期，包括基本潮汐（半日潮、全日潮和混合潮），大－小潮周期以及一些长期周波动等。最后对潮汐韵律层在推测地史时期地－月系的演化历史中的意义作了评述。     

An extreme value analysis of the flow of Burbage Brook

An extreme value analysis of the flow of Burbage Brook is carried out by modelling peaks over a high threshold. The aims are to illustrate recently developed statistical techniques and to report on interesting features of the flow of the brook over a 58-year period. Peak flows are found to show marked seasonal variation and a downward trend. Then-year return level is estimated for various values ofn, and the reliability of the estimates is assessed.     

阳原盆地化稍营地区断层主要活动时期的研究

研究一个地区断层主要活动时期是了解地壳构造运动或断层发育历史的基础。本文仍沿用了传统研究法,并将同位素法和石英形貌法测年与显微构造分析法引进到研究断层主要活动时期的工作中,取得了能相互映正的结果,最后确定阳原盆地化稍营地区的断层经历过:元古代前;燕山期;6～9千万年;上新世——早更新世和最后一次较强烈活动在20—30万年以前等五次主要活动时期。     

广义帕累托分布在广东重现期风速计算中的应用

利用广东省86个国家气象观测站建站以来近70a的逐月最大风速序列和近20a(1999—2018年)的逐月最大风速序列,基于POT抽样法,分别采用三参数广义帕累托分布函数对各站的重现期风速进行了概率计算,计算过程中三参数广义帕累托分布函数分别采用矩估计(MOM)、极大似然估计(MLE)、似然矩估计(LM)和概率权矩估计(PWM)等4种参数估计方法,结合表征参数估计优良性的指标:均方根误差RMSE、拟合相对偏差和显著性水平为0.05的科莫戈洛夫检验拟合适度指标K_f对拟合效果进行检验,结果表明:基于POT抽样的概率权矩估计(PWM)拟合效果最好。     

土层结构对反应谱特征周期的影响

本文选取和构造了若干有工程意义的典型场地剖面,利用目前工程上广泛应用的场地地震反应分析的一维等效线性化波动方法,计算了在不同地震动输入下的不同场地剖面的地表加速度峰值和地表速度峰值。利用计算得到的地表加速度峰值和速度峰值计算了不同场地在不同地震动输入下的反应谱的特征周期。研究了不同土层结构对地表加速度反应谱特征周期的影响,获得了一些有意义的结果。     

Study on Xu Xia-ke's travels of the extraordinary cold in the 17th century and the extra long heavy rain in Yunnan Province in 1638

This paper is translated and consolidated from the following papers: Study on Xu Xia-ke's Records of the Extraordinary Cold Caused by the Heavy Snow in the 17th Century (Geographical Research, v. 12, no. 3), and A Study on the Extra Long Autumn Rain in the Central Part of Yunnan in 1638 Based on Xu Xia-ke's Travels (Geographical Research, v. 14, no. 4). The translation and consolidation were done by Wong Yat Loon, Department of Urban and Environment Science, Peking University, Beijing 100871, China This revised version was published online in August 2006 with corrections to the Cover Date.