超压对碎屑岩机械压实作用的抑制与孔隙度预测

为了研究超压对碎屑岩储层机械压实作用的抑制作用和预测超压背景下碎屑岩储层的孔隙度,本文根据压力平衡原理,推导了地层超压与有效埋深的关系方程,并在综合考虑超压、溶蚀和胶结作用的基础上,建立了超压背景下储层孔隙度的预测模型。结果表明,盆地中地层的密度越小,超压对碎屑岩储层机械压实的抑制效果越明显。三个不同时代、不同类型沉积盆地的孔隙度预测结果表明,应用本文建立的储层孔隙度预测模型所预测储层孔隙度的误差均低于Gluyas和Cade方程,而且孔隙度预测的误差随地层时代的变老而增大。在储层胶结物小于10%的条件下,新生代超压盆地碎屑岩储层孔隙度的预测误差小于2%,而中生代超压盆地储层孔隙度的预测误差大于5%。本文建立的超压背景下的碎屑岩储层孔隙度预测模型仅适用于时代较新超压盆地的孔隙度预测。     

江汉平原粮食产量空间格局分析

基于湖北省第一次地理国情普查数据、基础地理信息数据和统计年鉴等资料,采用洛伦兹曲线、Moran指数等对江汉平原典型4个粮食主产区监利县、洪湖市、仙桃市、潜江市的粮食产量空间格局进行了分析和研究。研究表明:①洪湖市耕地资源与粮食产量间的对应关系较为平等,粮食单产稳定,粮食生产空间聚集显著;②监利县、潜江市与仙桃市的耕地、粮食产量表现出极弱空间相关性或无相关性,粮食生产能力相对较差,耕地资源及产量未表现出空间聚集优势。该结论可为农业部门制定农业生产计划和发展规划提供良好的数据支撑,为地理国情普查成果的应用提供借鉴。     

On The Concept Of Periapsis In Hill’s Problem

The concept of closest approach is analyzed in Hill’s problem, resulting in a partitioning of the position space. The different behavior between the direct and retrograde motion is explained analytically, resulting in a simple estimate of the variation of Hill’s periodic and quasi-circular orbits as a function of the Jacobi constant. The local behavior of the orbits on the zero velocity surfaces and an analytical definition of local escape and capture in Hill’s problem are also given.     

Acute toxicities of potassium permanganate, formalin, and Lugol’s iodine solution to a marine ciliate, Pleuronema coronatum (ciliophora, scuticociliatida)

Acute toxicities of potassium permanganate, formalin, and Lugol’s iodine solution to a commonly occurred marine ciliate Pleuronema coronatum (Ciliophora, Scuticociliatida) were measured. Linear regression analysis of the results highlighted the close relationships between doses of the medicines and mortalities of the organisms, thus providing a capability to predict toxicity effects from the dose. Toxic effects of the medicines on the ciliates were described in the present paper, and the median lethal concentrations (LC₅₀ values) were given. Results of measurements indicated that 2 h-LC₅₀ and 12 h-LC₅₀ values of formalin on P. coronatum were 59.00×10⁻⁶ and 43.57×10⁻⁶, while those of Lugol’s solutions were 90.13 and 67.84×10⁻⁶ respectively. The tolerance of P. coronatum to formalin is apparently lower than that to Lugol’s iodine solution and potassium permanganate is a suitable medicine to kill ciliates in short time.     

论党的第二代领导集体对政治民主化的贡献

政治文明是社会主义社会政治现代化建设的重要目标,而政治民主化是政治文明发展的重要体现。党的第二代领导集体在社会主义政治民主化方面作出了重要贡献,即健全与完善了人民代表大会制度、党内民主制度以及基层民主制度,积极推动了中国社会主义政治文明的发展进程。     

朝鲜2017年核爆对中国东北地区形变场的影响

基于19个连续GNSS观测站的多种采样率（10 Hz、1 Hz和30 s）数据,分析2017-09-03朝鲜核爆对中国东北地区地壳形变场的影响。静态位移分析结果显示,距核爆现场最近的GNSS观测站JLCB没有产生明显的同震形变,与基于均匀半无限弹性空间断裂位错模型正演模拟的结果一致;GNSS应变结果显示,此次核爆在东北区域引起主应变的略微调整,但总体调整量在10-8以内,没有引起区域范围内面应变的变化;高频GNSS动态形变分析结果显示,核爆在JLCB站处没有引起明显的波形变化。另外,高频GNSS受到多路径效应的影响,可能会引起cm级的扰动,利用恒星日滤波方法可以抑制多路径的影响,得到精度更高、更可靠的动态形变结果。     

青藏高原大尺度地表流体的重力效应特征分析

基于2002~2017年三维大气再分析模型、水文模式及GRACE卫星重力数据,采用负荷格林函数和卫星重力反演方法分析青藏高原大尺度地表流体的重力效应特征。结果表明,青藏高原地区大气扣除季节项前后的重力效应峰对峰变化介于1.9~10.7 μGal和1.1~4.6 μGal,其负荷效应呈现出显著的季节性特征;土壤水和积雪扣除季节项前后的重力效应峰对峰变化介于0.9~9.9 μGal和0.7~8.3 μGal,其负荷效应呈现出显著的季节性和年际变化特征;GRACE时变重力场扣除季节项前后的重力变化峰对峰变化介于4.4~24.1 μGal和3.4~18.3 μGal,考虑观测误差、构造运动和信号泄漏误差的影响,其显著的季节性和年际变化反映了多种地表流体的综合影响。     

Baily’s Beads Atlas in 2005 – 2008 Eclipses

In the annular or total eclipses of 3 October 2005, 29 March 2006, 22 September 2006, and 1 August 2008, observational campaigns were organized to record the phenomenon of Baily’s beads. These campaigns were internationally coordinated through the International Occultation Timing Association (IOTA) at both its American and European sections. From the stations in the northern and southern zones of grazing eclipse, the eclipses have been recorded on video. Afterward, as many beads as possible have been identified by analyzing the video data of each observing station. The atlas presented in this paper includes 598 data points, obtained by 23 observers operating at 28 different observing stations. The atlas lists the geographic positions of the observing stations and the observed time instants of disappearance or reappearance of beads, identified by an angle measured relative to the Moon’s axis of rotation. The atlas will serve as a basis for determining the solar diameter. Electronic Supplementary Material  The online version of this article () contains supplementary material, which is available to authorized users.     

Ion acceleration and Alfvén wave generation at the Earth’s bow shock

The processes of ion acceleration and Alfvén wave generation by accelerated particles at the Earth’s bow shock are studied within a quasi-linear approach. Steady-state ion and wave spectra are shown to be established in a time of 0.3–4 h, depending on the background level of Alfvénic turbulence in the solar wind. The Alfvén waves produced by accelerated ions are confined within the frequency range 10^?2–1 Hz and their spectral peak with a wave amplitude βB ～ B comparable to the interplanetary magnetic field strength B corresponds to the frequency v = (2–3) × 10^?2 Hz. The high-frequency part of the wave spectrum (v > 0.2 Hz) undergoes damping by thermal ions. The calculated spectra of the accelerated ions and the Alfvén waves generated by them reproduce the main features observed in experiments.