个旧矿区水文地质现状及地下水保护与利用

云南省个旧大型锡多金属矿山,矿区面积大,几百年来的采矿活动导致矿区水文地质环境遭受强力改造,地下水补给、迳流、排泄条件明显变异,分水岭迁移,甚至造成局部污染.针对矿区目前的水文地质现状,建议开展水文地质调查与监测,采取措施,既加强地下水保护,也充分提高水资源利用率.     

Note on the Generalized Hansen and Laplace Coefficients

Recently, Breiter et al. [Celest. Mech. Dyn. Astron., 2004, 88, 153–161] reported the computation of Hansen coefficients X _k ^{γ ,m} for non-integer values of γ. In fact, the Hansen coefficients are closely related to the Laplace b _s ^(m), and generalized Laplace coefficients b _s,r ^(m) [Laskar and Robutel, 1995, Celest. Mech. Dyn. Astron., 62, 193–217] that do not require s,r to be integers. In particular, the coefficients X ₀ ^{γ ,m} have very simple expressions in terms of the usual Laplace coefficients b _{γ +2} ^(m), and all their properties derive easily from the known properties of the Laplace coefficients.     

Crustaceous lichens sensitive monitor of caesium-137 radiation level in terrestrial environment

The activity of caesium-137 （Bq/kg） in the crustaceous lichens and other samples was determined to prove the feasibility that crustaceous lichens work as a sensitive biology monitor to record the caesium-137 （Bq/kg） radiation levels of terrestrial environment. The measurements were performed with GEM series HPGe （ high-purity Germanium） coaxial detector system （ADCAM -100 ） made by EC ＆ GORTEC Company in USA. It was found that the activity of caesium-137 （Bq/kg） in the crustaceous lichens was one order of magnitude higher than that found in surface soil, and was over throe orders of magnitude higher than those found in the familiar biological samples. These results proved that crustaceous lichens may be one of the most sensitive biological monitors about the remote transmission and environmental radiation levels of caesium-137.     

Some Recurrence Relations Between Hansen Coefficients

A new system of recurrence relations for Hansen coefficients is obtained. This system gives a connection between only those coefficients which are included in the disturbing function of planetary or satellite motion and allows to compute efficiently the Hansen coefficients for perturbations both from internal and external bodies. The recurrence process can be realized both from high to low and from low to high harmonical terms of the disturbing function. The corresponding algorithms of evaluation of Hansen coefficients are presented. The efficiency of the obtained system of recurrence relations is discussed.     

Spot Modelling of ζ Andromedae

The photometric light modulation of ζ Andromedae originates from the distorted geometry of the primary, and additionally, from spots of which parameters (temperature, size, location) are variable in time. We present spot modelling results for six two-colour light curves which show that spots preferably appear on the stellar surface towards the companion star and opposite to it, where the distortion also causes dimming. Therefore, simple fitting of the measured data for the ellipticity effect does not yield correct result. Instead, ellipticity calculated from exact stellar parameters should be removed from the data to get reliable spotted light curves.     

地下水埋深对作物产量与水分利用效率的影响及作物系数变化

采用排水式蒸渗仪试验,研究不同地下水埋深对冬小麦和春玉米产量和水分利用效率的影响及其作物系数的变化,表明冬小麦和春玉米生育期的地下水位分别控制在1.5 m和1.0 m以下时产量和水分利用效率最为适宜,作物系数随地下水埋深的变化而变化,幅度可达到0.5～0.6,作物系数最大值处于1.2 m埋深处。研究结果可为地下水埋深较...     

深基坑“T”型地下连续墙应力监测分析

根据上海某工程深基坑“T”型截面地下连续墙安全监测数据,修正温度变化对振弦式钢筋计应力测值的影响,通过计算分析地连墙不同截面的应力规律并计算对应的弯矩及轴力值,得出了一些结论和建议,对类似工程有一定借鉴作用。     

Sea trials and application of a numerical method for the analysis of the ocean current displacement phenomena of demersal longlines

In this study, a numerical method for the analysis of the sinking speed of demersal longlines was developed to obtain further insight into the ocean current displacement of demersal longlines. The sinking speed is one of the main factors affecting the extent of current displacement, which is the horizontal movement of longlines due to ocean currents.To improve the accuracy of the model, bait properties were investigated in a flume tank, and the resistance coefficients of full scale models based on different bait shapes, sizes and orientations were established. The numerical method was verified by full scale experiments conducted in the sea.In the theoretical analysis, the sinking speed of a Norwegian commercial longline was calculated. Current-related data of a common longlining area in Norway were obtained from the Acoustic Doppler Current Profiler (ADCP) and were used to calculate the ocean current displacement of a demersal longline. The results show the ocean current displacement of longlines, and make to expect a decrease in the fishing efficiency.     

Modelling Eclipsing Binaries with Dense Spot Coverage

To synthesise images of stellar photospheres with high spot filling factors, we model an extrapolated solar size distribution of spots on an immaculate SV Cam. These models of starspot coverage show that the primary star is peppered with a large number of subresolution spots. Using these model starspot distributions we generate a photometric lightcurve, which is then used as input to an maximum-entropy eclipse mapping code, that is based on chi-squared minimisation. I solve for the system parameters to show the effect of dense spot coverage on the derived system parameters, and show that surface brightness distributions reconstructed from these lightcurves have distinctive spots on the primary star at its quadrature points. It is concluded that two-spot modelling or chi-squared minimisation techniques are more susceptible to spurious structures being generated by systematic errors, arising from incorrect assumptions about photospheric surface brightness, than simple Fourier analysis of the light-curves.Marie Curie Intra-European Fellow     

An Estimate of <Emphasis Type="Italic">P</Emphasis>-Mode Damping by Wave Leakage

High-cadence TRACE observations show that outward-propagating intensity disturbances are a common feature in large, quiescent coronal loops. Analysis of the frequency distribution of these modes shows peaks at both three- and five-minute periods, indicating that they may be driven by the solar surface oscillations (p modes). The energy flux contained within the coronal intensity disturbances is of the order of (1.1±0.4)×10³ ergs cm⁻² s⁻¹. A simple order-of-magnitude estimate of the damping rate of the relevant p modes allows us to put an observational constraint on the damping of p modes and shows that leakage into the overlying coronal atmosphere might be able to account for a significant fraction of p-mode damping.