与其导数具有分担值的全纯函数的正规族

证明了一个区域上的全纯函数族是正规的。如果任意的两人相互判别的有限非零值为族中任意函数及其一阶导数在该区域中的ＣＭ分担值 。     

固结度平方根法计算公式的理论证明

自从太沙基在实验基础上提出固结度与时间因数计算的平方根法公式以来,其在工程中发挥了重大的作用,但其理论上的证明一直未见报导。以误差函数为基础,对平方根法计算公式进行了理论上的论证,得到了平方根法计算公式的原型,并与前人级数公式的计算结果进行了对比,两者吻合良好。     

汶川地震余震序列的地震各向异性初步分析

2008年5月12日,在四川龙门山断裂带上发生了8.0级大地震,根据中国地震台网中心的地震目录,震源深度为14km处,属于浅源构造地震.汶川地震序列是主震余震型.截至到2008年10月,已发生了3万余次连续余震.北东走向的龙门山断裂带位于青藏高原东缘,是由3条断裂构成,自西向东分别是龙门山后山断裂,龙门山主中央断裂,龙门山山前断裂.龙门山断裂带是一条以逆冲为主,走滑为辅的大型断裂带.     

1990-2015年喜马拉雅山东段中国和不丹边境地区冰川变化研究

利用Landsat影像,EDM影像等数据资料,使用遥感图像处理及目视解译方法提取了喜马拉雅山东段中国与不丹边境地区冰川从1990—2015年4期边界,研究其与气温降水变化关系,并选取特定冰川,对其表面流速进行估算。研究表明：1990—2015年,该地区冰川退缩速率达0.43%·a^-1,并且冰川年退缩率逐渐增大,表明冰川消融速度逐渐加快。该时段内,气温呈现明显上升趋势,导致了冰川的快速消融。通过对冰川表面流速的估算,得出中国与不丹边境地区研究选取的冰前湖对冰川流速具有促进作用,加速冰川消融。     

我国水污染状况与防治

我国东部近岸海洋,部分江河、湖泊,许多城市邻近地区的地下水污染呈不断发展与恶化态势,造成部分城市和村镇供水水质下降,有的甚至发生供水危机。及时加强水体污染控制与治理已成为迫切的任务。     

Instability of the Kuroshio in Luzon Strait: Effects of ridge topography and stratification

The spectral analyses of moored current velocities in the central Luzon Strait reveal northward (i.e., downstream of the Kuroshio) propagation of a frontal wave with a five-day period, with wave amplitude increasing northward. Estimated from both curve fitting and frequency domain Empirical Orthogonal Function methods, the characteristics of five-day variations have wave speeds ranging from 32 to 40 cm s⁻¹, wavelengths ranging from 130 to 150 km, and e-folding time scales for growth ranging from 0.8 to 3 days. An analytical two-layer model used to explore linear stability characteristics indicates that bottom topography (two meridional ridges) is important for the Kuroshio stability characteristics in the Luzon Strait. In the two-layer model with the two ridges, the flow is stabilized for the long-wave mode but destabilized for the short-wave mode (due to increasing vertical shear in the horizontal velocity). The analytical model produces wavelengths and phase speeds for the most unstable mode which is similar to the observation, but the growth rate is underestimated. However, a spectral numerical model applied with a more realistic stratification and velocity structure does obtain faster growth rates comparable to the observations. Parameter sensitivity tests were conducted using the analytical model. The characteristics of the most unstable mode are most sensitive to the surface front location relative to the bottom topography but not sensitive to varying the density difference and thickness of the upper layer.     

Transient process and optimal design of receiver coil for small‐loop transient electromagnetics

Distributed parameters of the receiver coils greatly affect transient electromagnetic signals over short time periods, causing a delay in the signal's effective sampling time and the loss of shallow exploration information. This paper investigates the influence of transient process on apparent resistivity calculation and analyses the relations between the error of apparent resistivity and receiver coil design. We find that, under the same effective area, different radii of the receiver coils lead to different levels of impact on the estimation of the apparent resistivity. An optimization model is proposed to determine the optimal receiver coil size that gives rise to the smallest estimation error of the apparent resistivity. The relationship between the optimal radius and the effective areas is developed, which serves as a guideline for the optimal receiver coil design. The results may provide a useful means for improving the accuracy of the small loop transient electromagnetic instrumentation for shallow‐depth mapping.     

昆明盆地粉质粘土土动力参数研究

土动力参数是土层地震反应分析中重要的参数之一,且具有较强的区域性特点。本文收集了昆明盆地区域内68个场地的137组粉质粘土的动三轴试验数据,进行了统计分析,并通过土层地震反应分析计算,与袁晓铭的推荐值和《工程场地地震安全性评价工作规范(DB001-94)》中给出的规范值做了对比,结果表明:采用本文统计的土动力参数,所得的地震动参数具有一定的代表性和适用性。在昆明盆地区域,本文的统计值在Ⅱ、Ⅲ类工程场地地震安全性评价工作中具有一定的借鉴和参考作用。     

青海循化盆地晚渐新世沉积物中坡缕石的特征及其古气候指示意义

采用X射线衍射和扫描电子分析方法,对青海循化盆地晚渐新世沉积物的矿物组成、坡缕石的矿物学特征以及古气候指示作用进行了深入的研究。结果表明,晚渐新世循化盆地沉积物中粘土矿物组成主要有蒙脱石、伊利石、坡缕石和绿泥石等;坡缕石一般呈纤维状或者针状,沿片状蒙脱石的边缘及表面交代生长,为典型自生成因的坡缕石。坡缕石是干旱-半干旱气候条件的特征矿物,其出现表明循化地区晚渐新世气候特征较为干旱,与粘土矿物组合及伊利石结晶度所反映的气候环境信息相吻合;沉积物中坡缕石相对含量及有序度自下而上逐渐增大,说明循化地区的干旱化逐渐加剧。循化地区晚渐新世(～23 Ma)的干旱化可能与青藏高原隆升或者全球气候变冷事件密切相关。