医院病房楼电梯设计初探

本文概述了医院病房楼电梯的总体设计,具体分析了电梯的选择布置等情况。     

L'élévation séculaire des berges antiques et médiévales de Bordeaux. Étude géoarchéologique et dendrochronologique

On the banks of the Garonne River at Bordeaux, the discovery of three antique and medieval harbour platforms situated below the highest spring tide level (HWS) is witnessed to its increase of 1.10 m between the 12th and 14th centuries. It was then identified during excavations in the port of London and along the southern coast of the North Sea. In another direction, European studies suggest the consequences of such a sea level rise by identifying submerged ancient and medieval sites. This increase can be correlated to climatic oscillations, both regional and global, as has been identified by dendroclimatology. This centennial increase has not been accepted as an integral part of the curve expressing the maritime contour line over a period of thousands of years. This latter curve tends to smooth out oscillations in the order of a century and regional scale. To conclude, this medieval increase is comparable to that attested during the 20th century; this permitting a modulation of the importance of the anthropic component on the latter. To cite this article: T. Gé et al., C. R. Geoscience 337 (2005).     

边坡位移监测的若干技术问题

本文探讨了影响边坡位移监测精度的若干主要技术问题,认为只有选择恰当的地表位移监测基准,并对监测方案、监测站的布设和监测周期的设计等技术问题进行优化,才能满足边坡变形监测的要求。因此本文在此基础上,建议使用多种监测手段,建立立体监测系统,同时监测地表和地下位移,有助于全面反映边坡的变形破坏情况,从而为边坡的稳定性分析和滑坡预测预报提供科学依据。     

龙永煤田昌福山区地质勘探工作探讨

通过对福建省永定县昌福山勘探区的构造及煤层进行对比分析,认为该区的勘探类型为三类二型.在分析该勘探类型的勘探阶段划分、勘探手段选择的基础上,对其各勘探阶段工程量进行了最合理布置.经过多年的勘查实践证明,本区选择的勘查方法合理正确,所提交的详终报告获一次性评审通过.希望对该类型勘查区的勘查工程布置有一定的参考意义.     

SCOUR MITIGATION AT BRIDGE PIERS USING SACRIFICIAL PILES

To mitigate scour around bridge piers, sacrificial piles are economic method where natural processes are involved. The arrangement should be such that scoured materials from the sacrificial piles should have enough volume to fill the scour hole created upstream of the pier in such a way that sediments are trapped inside the scour hole. This concept differs from earlier study made with sacrificial piles that mainly deals to reduce the strength of horseshoe vortex. To determine the effect of sacrificial piles for scour mitigation, alternative arrangements of piles were tested in front of a rectangular pier under clear-water condition and found that when the group of piles is placed at a distance of twice the projected width of the pier, for which percentage of blockage of the pier width is 60%, the scour volume can be reduced upto 61% while the maximum scour depth can be reduced upto 50%.     

提高台站短水准则量成果精度的几项措施

结合清原地震台台站水准1985年前后观测成果精度的变化，总结了提高台站短水准观测成果精度的几点主要成功措施。它们是：选择最佳视线长度；拓宽线路、增高视线、减弱折光影响；改造仪器站条件；固定观测时间和人员；确定好观测光段。     

High-resolution evidence from southern China of an early Holocene optimum and a mid-Holocene dry event during the past 18,000 years

Computer models suggest that the Holocene Optimum for East Asian summer monsoon precipitation occurred at different times in different regions of China. Previous studies indicate that this time-transgressive Holocene Optimum should have been experienced about 3000 yr ago in southern China. In this study we describe a section which allows us to test this timing directly. We have closely examined high-resolution eutrophic peat/mud sequences covering the past 18,000 cal yr at Dahu, Jiangxi, on the southern boundary of the mid subtropical zone in China. Late Pleistocene successions in the Dahu record indicate cooler and much wetter conditions relative to synchronous events in north-central China. Our results indicate that the Holocene Optimum occurred between ca. 10,000 and 6000 cal yr ago in southern China, consistent with the global pattern. Conditions were relatively dry and cold from 6000 to 4000 cal yr ago. Our data also support the conclusion that the last deglaciation to early Holocene in the south was much wetter, resulting in the formation of dense broad-leaved forests, which could have acted to moderate land temperature ∼10,000 to 6000 cal yr ago, yielding a stable early-Holocene climate. After 6000 cal yr, forest reduction led to unstable land temperatures, and possibly to a northerly shift of the subtropical high-pressure system. Whatever the mechanism, these changes resulted in decreased precipitation between 6000 and 4000 cal yr B.P. in southern China.     

三峡井网的布设与观测井建设

介绍了我国第 1个以监测水库诱发地震的地下水前兆为目标的三峡井网布设与观测井建设的科学思路及其实施结果。由于水库蓄水引发一定震级的诱发地震时 ,会引起含水层应力应变状态及与其相关的孔隙压力变化 ,并导致观测井水位的异常变化 ,为此利用震级 (MS)、孕震断层长度(L)与应力应变场变化范围 (R)的关系确定了井数与井间距 ;井位的选择 ,主要依据了地下水动态为映震灵敏条件的科学认识 ,选择了断裂带及其应力易集中的端点、拐点与交点等特殊构造部位 ;井深与井孔结构的确定 ,遵循了在有限投资的前提下 ,尽可能揭露封闭性好的承压含水层 (带 )和尽可能减少地表水文气象因素干扰的原则。按照上述思想与原理 ,在坝区和库首区各布设了 4口井 ,井深为10 0～ 2 0 0m ,均揭露出封闭性较好的承压含水层 (带 )。初步观测结果表明 ,三峡井网的布设与观测井的建设较为成功 ,为诱发地震前兆监测奠定了良好的基础     

GRM 法对江苏 HQ-13线 P_g 波折射资料的再解释

用一种新的折射解释法——广义互换法(GRM),对江苏HQ-13线P_g波资料进行了解释。GRM法打破了传统的解释程序,先用计算机处理,后解释,其结果既客观又省时,不但能显著提高经济效益,而且经钻井资料证明它的解比T_oT_p法更精确     

航片判读新疆东天山巴里坤活动断裂带展布及变位地形特征

据航空像片活断层变位地形判读,巴里坤活动断裂带包括西盐池断裂及托来泉断裂。这2条断裂又分别由3条及4条次级断层组成。次级断层呈左阶方式排列。这些断层形成山前平直陡崖,错断洪积扇及河漫滩,形成地表陡坎、凹沟及淤积塘,组成地表地震形变带。这2条断裂是否分别对应1842年及1914年东天山2次7.5级地震,仍需进一步探讨。