江西茅排金矿床地质特征及找矿方向

茅排金矿是我省近年发现、探明的又一小—中型岩金矿床。震旦纪—早古生代火山沉积建造提供主要成矿物质,多期次构造活动为成矿主要的控制因素,同期岩浆活动也促进了矿化富集。可注意沿北东—北北东向韧－脆性断裂带旁侧,多期次构造－岩浆发育地段寻找类似金矿。     

Fracture plane control in rock blasting

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衡山界牌倾滑韧性剪切带的变形特征与应变分析

本文在前人工作的基础上,通过大量的第一手资料,对衡山界牌倾滑韧性剪切带（以下简称该带）的分带、变形特征、形成环境进行了探讨;对该带的几何学、运动学特点进行了分析,计算了该带的变应程度和位移量,并探讨了该带的成因及演化模式。     

龙门山陆内俯冲带形成机制探讨

本文分析了龙门山陆内俯冲带两侧岩石圈的强度结构特征及在侧向力作用下所发生的变形过程。盆地岩石圈中高强度层厚而紧凑,显示了较好的整体高强度性;造山带岩石圈上地壳具高强度,其下为低强度层。在侧向挤压力的作用下,变形主要发生于造山带一侧,最可能的变形方式是其脆性上地壳出现倾向后陆的逆冲断层,盆地岩石圈沿此断层俯冲,挤压其下部的低强度层,使之发生韧性增厚变形。     

Intercomparison of Tropospheric OH Measurements by Different Laser Techniques during the POPCORN Campaign 1994

In-situ OH measurements by laser-induced fluorescence (LIF) spectroscopy and folded long-path differential optical absorption spectroscopy (DOAS) were carried out in a rural environment in North-East Germany as part of the field experiment POPCORN in August 1994. The large set of OH data obtained allowed an intercomparison of both techniques based on relative diurnal profiles and simultaneously measured absolute concentrations. Most of the time the two OH instruments encountered the same air and agreed well in the measured relative diurnal variations. Only on a few occasions the measurements significantly disagreed due to a perturbation of the DOAS measurements by a local OH source in the north-western wind sector. Excluding data from this wind direction, the statistical analysis of 137 data pairs yields a correlation coefficient of r = 0.90 and a weighted linear fit with a slope of 1.09 ± 0.12. The correlations are carefully analyzed. The comparison of both instruments is discussed in the light of newly published effective absorption cross-sections for H2O and O2 that affect the calibration of LIF.     

涡旋诱发磁重联模型的解析研究

在磁流体中涡旋诱发重联的线性过程的解析研究过程中,主要运用了渐近匹配展开方法．结果表明,如果流体粘性远大于磁粘性,流场马赫数Ma～1,重联的线性增长率正比于Vv为无量纲化流体粘性,这与数值模拟结果一致．此结论表明,流体粘性能够促进磁场重联,在理论上支持涡旋诱发重联模式．本文还研究了周期分布多电流片系统中涡旋诱发重联的线性增长率;随电流片之间距离的减小,反对称和对称情形的增长率分别增大和减小．     

Water balance change for a re-vegetated xerophyte shrub area/Changement du bilan hydrique d’une zone replantée d’arbustes xérophiles

Abstract

Abstract Water balances for a re-vegetated xerophyte shrub (Caragana korshinskii) area were compared to that of a bare surface area by using auto-weighing type lysimeters during the 1990–1995 growing seasons at the southeast Tengger Desert, Shapotou, China. The six-year experiment displayed how major daily water balance components might vary for a bare and a re-vegetated sand dune area. Evapotranspiration from the C. korshinskii lysimeter represented a major part of the water balance. The average annual ET/P ratios varied between 69 and 142%. No seepage was observed for the vegetated lysimeter. For the bare lysimeter, on the other hand, 48 mm or 27% of observed rainfall per year occurred as seepage. These results suggest that re-vegetating large sandy areas with xerophytic shrubs could reduce soil water storage by transpiration. Also, the experimental results indicate that re-vegetating large sandy areas could significantly change groundwater recharge conditions. However, from a viewpoint of desert ecosystem reconstruction, it appears that natural rainfall can sustain xerophytic shrubs such as C. korshinskii which would reduce erosion loss of sand. However, re-vegetation has to be balanced with recharge/groundwater needs of local populations.     

Computational microstructure modeling to estimate progressive moisture damage behavior of asphaltic paving mixtures

This paper presents a computational microstructure model to estimate the progressive moisture damage of multiphase asphaltic paving mixtures. Moisture damage because of water transport is incorporated with mechanical loading through a finite element method. To simulate nonlinear damage evolution in the mixtures, the model includes Fickian moisture diffusion, a cohesive zone model to simulate the gradual fracture process, and a degradation characteristic function to represent the reduction of material properties because of moisture infiltration. With the model developed, various parametric analyses are conducted to investigate how each model parameter affects the material‐specific moisture damage mechanism and damage resistance potential of the mixtures. Analysis results clearly demonstrate the significance of physical and mechanical properties of mixture components and geometric characteristics of microstructure for the better design of asphaltic paving mixtures and roadway structures. Copyright © 2012 John Wiley & Sons, Ltd.     

Understanding of hydraulic properties from configurations of stochastically distributed fracture networks

A systematic investigation of the effect of configurations of stochastically distributed fracture networks on hydraulic behaviour for fractured rock masses could provide either quantitative or qualitative correlation between the structural configuration of the fracture network and its corresponding hydraulic behaviour, and enhance our understanding of appropriate application of groundwater flow and contaminant transport modelling in fractured rock masses. In this study, the effect of block sizes, intersection angles of fracture sets, standard deviations of fracture orientation, and fracture densities on directional block hydraulic conductivity and representative elementary volume is systematically investigated in two dimensions by implementing a numerical discrete fracture fluid flow model and incorporating stochastically distributed fracture configurations. It is shown from this investigation that the configuration of a stochastically distributed fracture network has a significant quantitative or qualitative effect on the hydraulic behaviour of fractured rock masses. Compared with the deterministic fracture configurations that have been extensively dealt with in a previous study, this investigation is expected to be more practical and adequate, since fracture geometry parameters are inherently stochastically distributed in the field. Moreover, the methodology and approach presented in this study may be generally applied to any fracture system in investigating the hydraulic behaviours from configurations of the fracture system while establishing a ‘bridge’ from the discrete fracture network flow modelling to equivalent continuum modelling in fractured rock masses. Copyright © 2007 John Wiley & Sons, Ltd.     

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