测量仪器在高层建筑施工中的应用

本文论述了新型测量仪器在高层建筑施工测量中的使用情况,并对新型测量仪器的使用方法及测量精度进行了分析。     

多点入流汇流计算法在北京城市洪水计算中的应用与研究

根据北京城市化水平,城市汇流特点,通过用多点入流汇流计算法模拟实测洪水过程线,分析了北京城市河道的汇流特点与规律,初步提出了一种适合于北京城市洪水计算的方法,为城市防洪排水工程规划,设计提供依据。     

一个韧性转换挤压带的变形分解作用：以阿尔金断裂带东段为例

变形构造研究显示阿尔金划分成具有近水平拉伸线理的韧性左行走滑变形域和具有陡角度倾伏拉伸线理的收缩变形域。在ＳＳ与ＰＳ之间的过渡区域还发现中等角度倾伏的拉伸线理。     

氢氧化物族矿物的氧同位素分馏

应用增量方法计算了氢氧化物族矿物的氧同位素分馏,得到常见氢氧化物的18O富集顺序为：褐铁矿＞三水铝石＞针铁矿＞水镁石＞硬水铝石。氢氧化物与其对应的氧化物相比显著地富集18O。三价阳离子的氢氧化物和氧化物的18O富集顺序为：M（OH）3＞MO（OH）＞M2O3。Al（OH）3同质多象变体之间也存在一定的分馏。对于石英-氢氧化物、方解石-氢氧化物和氢氧化物-水体系,本文计算提供了在0-1200℃温度范围内三组内部一致的分馏系数方程。这些理论校准与合成实验结果和／或地表温度下的天然样品相吻合,特别针铁矿、勃姆石和硬水铝石与水之间的氧同位素分馏关系能够满足地质测温的要求。因此,对氢氧化物-水体系的氧同位素分析可望提供表生环境下可靠的地质温度计。     

The coupled rotation of the inner core

The rotation of the inner core (IC) is influenced by the rest of the Earth through a number of coupling mechanisms. Among four possible coupling mechanisms, gravitational, pressure, viscous and electromagnetic, the first two torques are dominant. Numerous existing IC gravitational torque estimates have been shown to agree very well with one another Xu & Szeto 1996 ). It is shown in this paper that different estimates of the IC pressure torque are also in good agreement.
The coupled rotation of the IC has been investigated in the frequency domain by several research groups (Mathews et al. 1991a,b; De Vries & Wahr 1991 ; Dehant et al. 1993; Jiang 1993 ). Not all of these efforts obtained two IC-related rotational modes, the inner-core wobble (ICW) and the free-inner-core nutation (FICN). We investigate this problem in the time domain and confirm the existence of the two modes. The periods of ICW and FICN are in good agreement with those obtained by other researchers. In studying the effects of coupling torques on the IC rotational modes we have found that depending on whether the IC net torque is 'restoring' or otherwise, an increased torque magnitude will respectively shorten or lengthen the ICW period. We have also found that the sense of FICN is determined by the orientation of the net coupling torque on the IC.     

景观生态建设与生物多样性保护

２１世纪的景观生态学应该对环境建设有设计能力的学科。遵循适应自然、互利共生、调整结构改善功能与局部控制协调整体等景观生态建设的原理进行景观生态建设是积极的对生物多样性予以保护。     

Clustering stochastic point process model for flood risk analysis

Since the introduction into flood risk analysis, the partial duration series method has gained increasing acceptance as an appealing alternative to the annual maximum series method. However, when the base flow is low, there is clustering in the flood peak or flow volume point process. In this case, the general stochastic point process model is not suitable to risk analysis. Therefore, two types of models for flood risk analysis are derived on the basis of clustering stochastic point process theory in this paper. The most remarkable characteristic of these models is that the flood risk is considered directly within the time domain. The acceptability of different models are also discussed with the combination of the flood peak counted process in twenty years at Yichang station on the Yangtze river. The result shows that the two kinds of models are suitable ones for flood risk analysis, which are more flexible compared with the traditional flood risk models derived on the basis of annual maximum series method or the general stochastic point process theory. Received: September 29, 1997     

肝癌碘油CT分型与临床意义探讨

本文目的是评价肝癌碘油ＣＴ分型与其与栓塞疗效相应关系,使用的材料和方法是收集和分析我院４５例肝癌肝动脉碘油术后ＣＴ表现,比较分型与栓塞后肿瘤复发情况。结果是碘油在肝癌内的聚集开矿何分三种类型：完全型,斑片型和稀少型。经过随访发现,完全型疗效最佳,全部病例观察１年均未见局部复发：疗效其次是斑片型,其中１６例栓塞后６个月局部复发,余均在８－１０个月内复发;稀少型均在６个月内局部复发。结论是碘油在肝癌形     

Burst strain disturbance — A new test study on fracture precursor

A multi-functional high-frequency seismometer, a new instrumental system, is used for recording multi-point strain variations of rock samples in the process of fracture development. The results indicate that strain in each point appears burst disturbance synchronously besides a tendency variation before main fracture. The burst disturbance could probably be one of the short-impending precursors before great earthquake.