基于POI大数据的开封市城市功能扩张与演替特征分析

以POI为代表的社会感知数据为精细尺度城市空间结构研究提供了新思路，然而，POI数据与传统光学遥感数据的关系、长时序POI数据表征的城市功能空间扩张与演替特征还有待进一步挖掘。因而，本文以开封市主城区为例，采用2005—2020年POI数据，通过构建城市街区尺度功能集聚-扩散分析框架，利用空间统计指标和区位熵指数分析城市功能的演替特征与复合功能变化。结果发现：(1) 2005—2020年开封市城市社会经济活动呈逐渐增长的扩张态势，活动空间的面积扩张了11.26 km2，年均扩张速度由2005—2015年的3.5%提升至2015—2020年的5.1%；(2)城市各种活动的集聚、扩散过程造成不同功能的演替变化，其中开封市商服功能集聚程度较高，虽然受到新城区商业中心扩散的影响，单中心的城市发展模式依然没有发生变化；(3)具有复合功能的城市街区不断增多，对单中心的城市结构形成有益支撑。复合功能较强的街区主要分布在活力高、居民生活较为便捷的区域。本研究不仅能为城市空间规划的研究提供理论和技术支撑，也为城市更新、可持续发展以及国土空间规划提供新的思路。     

Near Real－Time Calculation of Ionospheric Electric Fields and Currents Using GEDAS

This paper presents the recent progress in our project of estimating near real-time electric fields and currents in the ionosphere through our computer system called the Geospace Environment Data Analysis System (GEDAS). We show a new technique in which data from ground magnetometers are collected by the system and used as input for the KRM and AMIE programs to calculate the distribution of ionospheric electric fields and currents, as well as of other ionospheric parameters, such as electric potential patterns. One of the goals of this project is to specify ionospheric processes. Examples of the near real-time calculation and the data flow of our scheme are presented.     

针对穿越重要构筑物时减少潜在水压裂隙的水平定向钻进设计

水平定向钻进管线安装的设计经常需要对钻进轨迹穿过土层的潜在水压裂隙进行评估。当轨迹穿过一个重要构筑物的下方（例如蓄水坝）时这种潜在的裂隙可以成为一个重要的设计因素。如果下层土体的水压裂隙引起钻井液流到地表,所造成的冒浆会引起水渗漏或者引发基础土体的破坏。因此,相关管理机构需要一份非常详细的关于水平定向钻进穿越过程中潜在水压裂隙和冒浆的评估。在研究HDI）穿越的水压裂隙模型过程中,对于抵抗水压裂隙和冒浆的安全系数的一个重要影响因素是土层的屈服强度。如果HDD穿越定位在高屈服强度的土层,潜在的水压裂隙将减少。该研究比较了两个HDD穿越的水压裂隙模型。第一个穿越的亚表土由中等密实的粘土纽成直到最大切削深度。第二个穿越的地下条件由中等密实的粘土覆盖在中等密实到非常密实的砂层。通过定位于密实砂层,水压裂隙和冒浆模型的结果表明较高安全系数的重要性。     

南普拉特河非开挖隧道风险管理案例分析

大草原水利项目（PWP）将增加奥罗拉市百分之二十的城市供水,每年提供高达一万英亩一英尺（约33亿加仑）的水。PWP项目的一个关键因素是输送系统,该系统由直径为60英寸、约33英里长的地下原水传输管道,15个非开挖隧道（包括南普拉特河）和三个抽水站组成,该抽水站将亚当斯县的南普拉特河水垂直提升900英尺输送到奥罗拉市的新彼得宾尼净水设施。非开挖方法被用来构建水路、湿地、高速公路、干道和铁路下面的管线。南方普拉特河非开挖隧道是该项目最重要和具有挑战性的工程之一。南普拉特河隧道的地层条件的特点是由从细粒到粗粒砂组成的冲积层,与河漫滩沉积物凝聚的砾石,局部地方含有卵石和石块,基岩上覆盖着粘土岩。冲积层有25—30英尺厚,一般具有高渗透性和高储水能力,而粘土岩渗透性低。该隧道长约260英尺,在粘土岩中隧道的最大深度为48英尺,并配有一个直径78英寸的钢护筒、一条直径60英寸的钢管道以及支持系统监控和数据采集（SCADA）的通信光纤电缆或管道。本文介绍了与南普拉特河隧道相关的风险管理。此外,本文还探讨了,在不影响美国联邦监管的水域及美国工程兵管辖范围内的湿地的情况下,与工程建设有关的独特设计和施工挑战。     

黄河宁蒙段河道水沙输移过程的仿真分析

通过建立河道水沙仿真系统模型,系统的模拟了天然状态下宁蒙河道泥沙的输移过程,并与现状条件下该河段泥沙输移过程进行比较.结果表明:龙羊峡和刘家峡水库建成运行后,由于水库拦蓄作用,宁蒙河段入口下河沿站1969-2003年累计减少输沙量25.9966×108t,说明上游梯级水库的蓄水拦沙作用显著地减轻了宁蒙河段的淤积过程.宁...     

淄博市国土资源局淄川分局党风廉政建设成效显著

近年来,淄博市国土资源局淄川分局党风廉政建设工作按照“教育转变思想,素质决定形象,制度约束行为,监督规范落实,文化支撑廉政”的工作思路,坚持以加强教育为基础,开展主题教育活动,组织教育报告会,观看系列专题教育片,进行警示教育等,增强全体干部职工拒腐防变、抵御风险侵蚀的能力。     

Sewage pollution in Negril, Jamaica: effects on nutrition and ecology of coral reef macroalgae

Coral reefs in the Negril Marine Park (NMP), Jamaica, have been increasingly impacted by nutrient pollution and macroalgal blooms following decades of intensive development as a major tourist destination. A baseline survey of DIN and SRP concentrations, C:N:P and stable nitrogen isotope ratios (δ15N) of abundant reef macroalgae on shallow and deep reefs of the NMP in 1998 showed strong P-limitation and evidence of increasing sewage pollution. In 1999, a sewage collection and treatment project began divertin...     

淄博市国土资源局淄川分局党风廉政建设成效显著

近年来,淄博市国土资源局淄川分局党风廉政建设工作按照"教育转变思想,素质决定形象,制度约束行为,监督规范落实,文     

Lower Permian formations of different geodynamic environments in A'nyemaqen ophiolitic zone (Buqingshan Mts., eastern Kunlun, Qinghai Province, China)

Lower Permian formations within the Buqingshan Mountains (A'nyemaqen ophiolitic zone, eastern sector of the eastern Kunlun) were formed in the following paleogeodynamic environments (from north to south): (1) shelf and slope of a passive continental margin in a marginal sea; (2) partially Permian metamorphic rocks of subduclion-accretion complexes and volcanogenic rocks of an ensimatic island arc, of the age limited from above by the Asselian - Sakmarian; and (3 ) an island arc slope and oceanic trench. Subduction-accretion complexes and the island arc volcanites are overlain with a sharp angular unconformity by a carbonate-conglomerate sequence, which presents as local molasse of the Early Permian age. Based on fusulinids from the basal limestone, the age of the local molasse is first defined as the Yakhtashian-Bolorian, i.e. Artinskian-Kungurian (?). The thorough investigations revealed that the initial closure of the eastern Paleotethys within the eastern Kunlun corresponded to the Sakmarian-Yakhtashian (Artinskian) boundary, whereas in the western Paleotethys sector (Northern Pamirs) the closure occurred considerably earlier, prior to the Late Bashkirian. Thus, the idea that the Paleotethys in the eastern Kunlun reached its maximum width in the Permian, is highly questionable. During the Early Permian the A'nyemaqen branch of the Paleotethys intensely decreased. Beginning from the Bolorian (Kungurian) and up to the end of the Permian this branch represented its relict in the form of a marginal sea depression. It may be suggested that the Paleotethys closure in the A'nyemaqen took place gradually from the west to the east and covered a long period from the Late Carboniferous to the terminal Early Permian.     

Separation of Different Contributions to the Total X-ray Luminosity in Gamma-ray Loud Blazars

The relativistic beaming model has been successfully used to explain many of the observational properties of active galactic nuclei. In this model the total emission is formed by two components, one beamed, one unbeamed. However, the exact contribution from each component in unresolved sources is still not clear. In the radio band, the core and extended emissions are clearly separated. We adopt the method proposed by Kembhavi to separate the two contributions in the X-ray emissions in a sample of 19 gamma-ray loud blazars. It is clearly shown that the beamed emission dominates the X-ray flux and the unbeamed X-ray emission is correlated with the extended radio emission of the considered objects. We also find that the ratio of the beamed to the unbeamed X-ray luminosity is correlated with the X-ray spectral index, an effect that should be a consequence of the underlying X-ray emission mechanism.