Natural Attenuation of Fuel Hydrocarbon Contaminants:Correlation of Biodegradation with Hydraulic Conductivity in a Field Case Study

Two biodegradation models are developed torepresent natural attenuation of fuel－hydrocarbon contaminants as observed in a comprehensive natural-gradient tracer test in a heterogeneous aquifer on the Columbus Air Force Basein Mississippi,USA．The first, a first-order mass loss model,describes the irreversible losses of BTEX and its individual components, i．e．,benzene（B）,toluene（T）,ethyl benzene（E）,and xylene（X）．The second, a reactive pathway model,describe ssequential degradation pathways for BTEX utilizing multiple electron acceptors,including oxygen,nitrate,iron and sulfate,and via methanogenesis．The heterogeneous aquifer is represented by multiple hydraulic conductivity（ K） zones delineated on the basis of numerous flowmeter K measurements．A direct propagation artificial neural network（DPN）is used as an inverse modeling tool to estimate the biodegradation rate constants associated with each of the K zones．In both the mass loss model and the reactive pathway model,the biodegradation rate constants show an increasing trend with the hydraulic conductivity．The finding of correlation between biodegradation kinetics and hydraulic conductivity distributions is of general interest and relevance to characterization and modeling of natural attenuation of hydrocarbons in other petroleum-product contaminated sites．     

Two-dimensional Numerical Modeling Research on Continent Subduction Dynamics

Continent subduction is one of the hot research problems in geoscience. New models presented here have been set up and two-dimensional numerical modeling research on the possibility of continental subduction has been made with the finite element software, ANSYS, based on documentary evidence and reasonable assumptions that the subduction of oceanic crust has occurred, the subduction of continental crust can take place and the process can be simplified to a discontinuous plane strain theory model. The modeling results show that it is completely possible for continental crust to be subducted to a depth of 120 km under certain circumstances and conditions. At the same time, the simulations of continental subduction under a single dynamical factor have also been made, including the pull force of the subducted oceanic lithosphere, the drag force connected with mantle convection and the push force of the mid-ocean ridge. These experiments show that the drag force connected with mantle convection is critical fo     

地球深部流体中的有机质与金刚石生长北大核心CSCD

金刚石代表了地球深部微量的碳存在,其成因对于理解行星演化的动力学机制、挥发分循环以及氧化还原状态演变等具有重要意义。在俯冲带环境,金刚石的形成和挥发分的循环密切相关。地球内部的碳通量主要受变质脱碳作用和碳酸盐溶解作用形成的相对氧化的水质流体的调节和控制。在深部C-H-O流体中,碳由随流体迁移到最终饱和形成金刚石的过程主要受碳在流体中溶解度的控制,而后者则受高温高压条件、pH值、氧化还原环境、溶质结构和岩石中缓冲矿物组合等多种因素的影响。     

Urban forest loss using a GIS-based approach and instruments for integrated urban planning:A case study of Jo(a)o Pessoa,Brazil

Urban forests play an important role in the thermal comfort and overall life of local populations in large-and medium-sized cities.This study analyzes urban forest loss and maps land use and land cover (LULC) changes between 1991 and 2018 by evaluating the use of urban planning instruments for the mitigation of urban forest loss in Jo～o Pessoa,Brazil.For this purpose,satellite-derived LULC images from 1991,2006,2010 and 2018 and data on urban forest loss areas obtained using the Google Earth Engine were used.In addi-tion,this paper also discusses the instruments used for integrated urban planning,which are(a) the legal sector,responsibility and nature;(b) the urban expansion process;and (c) the elements of urban infrastructure.The results show a clear shift in land use in the study area.The major changes in LULC classes occurred in urban areas and herbaceous vegetation,while the greatest loss was in arboreal/shrub vegetation.Thus,an increase in the pressure to occupy zones intended for environmental preservation could be estimated.Our results showed similar accuracies with other studies and more spatial details.The characteristics of the patterns,traces,and hotspots of urban expansion and forest cover loss were explored.We highlighted the potential use of this proposed framework to be applied and validated in other parts of the world to help better understand and quantify various aspects of ur-ban-related problems such as urban forest loss mapping using instruments for integrated urban planning and low-cost approaches.     

Incorporating the Istanbul-Ankara high-speed railway into the Belt and Road Initiative: Negotiation,institutional alignment and regional development

This article contributes to a small but growing body of multi-sited and multi-scalar research on the Belt and Road Initiative.We focus on relations at the national,regional and international scales,and present original research from China and Turkey,to show how the Istanbul-Ankara high-speed railway has served as a testing ground for China's Belt and Road Initiative(BRI).Its construction was initially funded by the European Investment Bank,but it is now part of the backbone of the Turkish Government's Middle Corridor plan which enhances west-east connectivity and integration with the Caucasus and Central Asia.We show that in contrast to multinational corporations from the OECD that seek to remain footloose,Chinese state-owned enterprises(SOEs)seek to adapt to,apprehend and ultimately shape local in-stitutions.In the case of Turkey this proved difficult given its institutional alignment with the European Union.Thus,while the railway project was completed successfully by a consortium led by a Chinese SOE,Turkey's dynamic and complex regulatory environment discourages Chinese SOEs in the infrastructure sector.We conclude that the Turkish and Chinese gov-ernments are currently pursuing complementary territorial visions yet their cooperation is project-based and pragmatic.     

测绘人的战“疫”风采

本刊讯新冠肺炎疫情发生以来,河南省测绘地理信息局广大党员干部按照局党委的要求部署,踊跃投身疫情防控工作,充分发挥了先锋模范作用,让党旗在疫情防控第一线高高飘扬。志愿服务筑牢疫情“防控墙”为缓解社区防控压力,全局党员干部组成抗击疫情志愿服务队,前往共建单位戊院社区开展疫情防控工作。志愿服务队密切配合社区党组织和派出所,认真开展疫情防控宣传和文明劝导工作,协助社区工作者对家属院进出人员进行体温监测,做好信息登记,并督促提醒他们规范佩戴口罩,齐心协力为共同打赢疫情防控阻击战而奋斗。     

刘金山在检查疫情防控工作时要求 高效有序做好全省自然资源系统疫情防控工作

2月3日节后上班第一天,河南省自然资源厅党组书记刘金山到厅机关南门值班室、西门值班室和机关餐厅等疫情防控监测点检查指导新型冠状病毒肺炎疫情防控工作,仔细检查人员配备、设备运作、监测记录和餐厅备餐等情况。刘金山强调,当前是打好打赢疫情防控阻击战的最关键时期,节后人员返程高峰就要到来,疫情防控面临新的挑战与考验。省委、省政府召开专题会议,传达贯彻了党中央、国务院的最新部署和要求,对下一步疫情防控工作进行了再动员、再部署、再安排。     

河南省测绘地理信息技术中心开展廉政警示教育

为进一步推进全面从严治党向纵深发展,持之以恒抓党风廉政建设,1月27日,河南省测绘地理信息技术中心组织召开会议,传达学习十一届省纪委二次全会精神,深入开展廉政警示教育。河南省自然资源厅党组成员,河南省测绘地理信息技术中心党委书记、主任刘济宝参加会议并讲话。河南省纪委监委驻省自然资源厅纪检监察组副组长陈建国到会指导。河南省测绘地理信息技术中心党委委员、副主任毛忠民,中心党委委员、副主任黄松涛参加会议。     

全省自然资源系统开展“能力作风建设年”活动推进会要求 聚焦重点关键 强化担当实干 推动能力作风建设持续抓深走实

本刊讯1月24日,河南省自然资源厅召开全系统开展“能力作风建设年”活动推进会,深入学习贯彻党的十九届六中全会精神和习近平总书记关于加强作风建设重要论述,认真落实省第十一次党代会、省委经济工作会议、省“两会”和全省开展“能力作风建设年”活动动员部署会议精神,部署推进全系统“能力作风建设年”活动。