泰安地震台重力异常信息提取初步分析

介绍了泰安台PET重力仪不同运行状态的情况,通过对比甚宽频带数字地震仪对掉格异常进行初步判断,同时对观测数据的主要干扰因素进行剔除,提取相对客观的重力观测趋势信息。结果发现,泰安地震台重力仪在2013-09~12、2014-02~04两个时间段存在趋势漂移负值异常。     

青海地热台网温度漂移问题初步分析

通过对青海省15个流体观测井多年的温度数据进行年变趋势分析发现,数据长期性漂移具有普遍性。青海省地热台网有6个台（井）的年漂移量超过0.01 ℃/a,达到地热观测台网仪器要求上限。温度漂移与同井水位、当地气温变化没有关联性,而且漂移大小在空间上的分布也无规律可循,因此单纯从温度观测数据来讨论,无法判断这种年漂移是否与区域应力应变状态有关。研究玉树井多年温度数据趋势看出,玉树地震这一地壳活动导致该井的温度趋势发生变化,其温度上升速率出现明显拐点;同样,格尔木井也由于改变观测部位而出现温度趋势拐点,可见将温度漂移简单地归结于观测系统（仪器+传感器）有失偏颇。通过对比两种不同原理的温度计发现,单纯从测量原理上无法解决漂移问题。剔除漂移干扰的同时,漂移趋势自身也是一个值得研究的问题。     

共反射面元叠加的应用理论--从共反射点到共反射面元

共反射面元（CRS）叠加是目前认为最好的生成零炮检距剖面的方式. 共反射面元 意指地下某一反射点邻近的一个反射弧段,该弧段在时空域内的走时响应称为CRS叠加面,该 叠加面可视为反射弧段上各共反射点（CRP）的时空域内走时响应的组合. 在一般的共反射 点走时关系基础上,引入两种特征波——Normal波和Normal Incidence Point波,就可以在 傍轴近似假设下,将CRP走时关系推广到反射点邻近的各反射点,将这些反射点的CRP走时关系 加以组合就得到了关于该反射点的共反射面元的走时关系. 考察从共反射点（CRP）到共反 射面元(CRS)的过渡,这一过程提供了CRS叠加的应用理论基础.     

The Importance of Time Synchronization in the Local Networks of the Science and Application Center for Lunar and Deep-space Exploration

The data acquisition stations and the data processing center of the Science and Application Center for Lunar and Deep-space Exploration (SACLuDE) are located at different geographical sites. They respectively have their own local networks and interconnect with each other through access to the core data network. This paper describes the clock drift in the computer and other networked devices building up the infrastructure of the above local networks. The network time variance of the stochastic model is also estimated. The poor precision of network synchronization will bring about potential hazards to the network operation and application running in the networks, which is clarified in the present paper. At the end of the paper, a cost-effective and feasible solution is proposed based on the Global Position System (GPS) and the Network Time Protocol (NTP).     

Hill stability in the many-body problem

We established a criterion for the Hill stability of motions in the problem of many spherical bodies with a spherical density distribution. The region of Hill stability was determined. The sizes of this region are comparable to the total volume of all of the bodies in the system, which sharply increases the probability of mutual collisions. This result may be considered as a confirmation that a supermassive core can be formed at the center of a globular star cluster. The motions in the n-body problem are shown to be unstable according to Hill.     

亚暴膨胀相近磁尾位形不稳定性模型Ⅰ．近磁尾位形不稳定性

用单流体和双流体ＭＨＤ近似，研究了近磁尾位形不稳定性（ＮＥＴＣ）．分析表明，ＮＥＴＣ可能存在两种漂移不稳定情况Ｃ１和Ｃ２与卫星观测资料对比显示，Ｃ２较容易在亚暴膨胀相前夕出现，它可以解释亚暴膨胀相期间磁场和等离子体扰动的特征周期、尾向传播速度、磁场扰动和等离子体压强扰动之间的位相关系，场向电流的周期性结构，西向涌浪头部的电子沉降和极光隆起等观测特性和现象．薄电流片的极端情况（Ｒｃ≈ｒｉ）不在本文的讨论范围之内．     

Variations in shoreface progradation and ravinement along the Texas coast, Gulf of Mexico

Shoreface architecture, evolution (mid-Holocene to present) and depths of transgressive ravinement were examined from Sabine Pass, at the Texas–Louisiana border, to South Padre Island, near the Texas–Mexico border, using 30 shoreface transects. Shoreface transects extend out to 16-m water depth, each created from an echo-sounding profile and, on average, seven sediment cores. The shoreface is composed of three broad sedimentological facies: the upper shoreface, composed almost entirely of sand; the proximal lower shoreface, composed of sand with thickly to medium-bedded (50–10 cm) mud; and the distal lower shoreface, composed dominantly of mud with medium- to thinly bedded (20–3 cm) sand. Shoreface architecture and evolution is extremely variable along the Texas coast. Shoreface gradients increase from 2·25 m km^–1 in east Texas to 3·50 m km^–1 in south Texas. Shoreface sands coarsen towards south Texas. East and south Texas shoreface deposits are thin and retrograding whereas central Texas shoreface deposits are thicker and prograding. Central Texas is characterized by stacked shoreface successions, whereas in east Texas, lower shoreface sands are preserved only in offshore banks. Preservation of shoreface deposits is low in south Texas. Although eustatic fluctuations and accommodation space have a strong impact on overall mid-Holocene to present shoreface evolution and preservation potential, along-strike variations in sediment supply and wave energy are the main factors controlling shoreface architecture. The transgressive ravinement surface varies from –6 to –15 m along the Texas coast.     

景电二期灌区土地沙漠化特征及治理对策

景电二期灌区总面积７１１３３ｈｍ２，土地沙漠化和风沙危害是灌区农业发展的主要障碍因子。通过该区土地沙漠化产生的原因、表现形式、以及沙漠化危害综合分析，提出治理和控制沙漠化土地措施有：１）恢复和建立保护性植被体系，２）进一步发展节水灌溉，扩大灌溉面积，３）提高土壤肥力，调整农业生产结构。     

Change of support for diffusion-type random functions

Diffusion-type random functions are a first attempt at a non-Markovian and multidimensional generalization of the Ito stochastic integral theory. Within this framework, the variation f of the pdf can be evaluated for a small change of support. These results are compared with the provisions of the usual approximate models. The conclusions are: the affine correction is false for the first order approximation, unless there is a linear factor. The isofactorial model is true for the first order, and in the multi-Gaussian case, almost correct for the second-order approximation. Counterexamples are given for the discontinuous case, and a more general model is suggested.     

均匀围岩介质中点源电流场的巷道影响模拟研究

以巷道底板供电为例,采用三维有限差分数值模拟技术对矿井下有巷道影响的全空间电流场的分布特征进行研究。初步研究了全空间点电源电流场分布的巷道影响规律,对矿井直流电法的基本理论研究和实际井下电法施工具有指导意义。