A Thermo–Hydro–Mechanical Model: Capturing the Effects of Initial Permeability and Gas Pressure on Outburst-Prone Indicators

Natural Resources Research - Coal and gas outbursts often result in a large number of casualties and economic losses. Its complex processes involve the multi-field coupling of gas flow, coal...     

Gas Emission and Soil Chemical Properties Associated with Underground Coal Fires,Wuda Coalfield,Inner Mongolia,China

Natural Resources Research - The coal fire area in the Wuda coalfield is divided into four parts based on the degree of burning and on surface characteristics: sub-area B is characterized by...     

Waveform Characteristics of Earthquakes Induced by Hydraulic Fracturing and Mining Activities: Comparison with Those of Natural Earthquakes

Natural Resources Research - Some industrial activities, such as underground mining, hydraulic fracturing (HF), can cause microearthquakes and even damaging earthquakes. In recent years, with the...     

A case study on Landscape Component Niche based on Landscape Pattern Indices: Yanchi,Ningxia Province,China

Yanchi County is located in the agro-pastoral ecotone and belongs to the ecologically fragile area of Northwest China.It is important to study the evolution of landscape pattern to curb its environmental degradation.In order to intuitively show how the landscape pattern of the study area changes over time,Landsat Thematic Mappers(TM)and Landsat Operational Land Imager(OLI)data of 1991,2000,2010 and 2017 were used.This paper attempts to apply niche theories and methods into landscape ecology,and constructs a niche model of landscape components by using"n-dimentional hypervolume niche theory"and landscape pattern indices.By evaluating the spatial and temporal evolution of niche from the perspective of two-dimensional space to reflect the changes of landscape pattern in the study area over the past 26 years,new theories and methods were introduced for the characterization of landscape pattern.The results indicate that:1)The larger the attribute and dominance value of landscape components,the higher the ecological niche and the stronger the control effect on the overall landscape.2)The ecological niche of each landscape component was significantly different,just as its control effect on the overall landscape.3)The dynamic change of the ecological niche of each landscape component was different,with grassland,unused land and arable land always in a high dominant position,although the ecological niche of construction land and water area was always low.In general,the introduction of niche theory into the landscape ecology provided a new method to study the changes in regional landscape pattern.     

面向服务的动态制图服务系统关键技术探讨

首先分析了传统专题地图制图技术在测绘信息化发展过程中呈现的弊端;然后基于目前迅速发展的WebGIS技术,研究了基于Web服务的在线制图技术,就在线地图制图中的符号构建、制图服务模型、数据服务等方面提出了基于在线地图的交互式自定义制图;最后设计开发了基于Web服务的交互式制图系统,实现了面向普通用户的在线订阅式制图和面向专业用户的在线定制式制图。实践表明,该系统动态专题制图功能灵活,表达方式多样,传播效率高,能满足不同专业背景用户的制图需求。     

Spatio‐temporal prediction of land surface temperature using semantic kriging

Spatio‐temporal prediction and forecasting of land surface temperature (LST) are relevant. However, several factors limit their usage, such as missing pixels, line drops, and cloud cover in satellite images. Being measured close to the Earth's surface, LST is mainly influenced by the land use/land cover (LULC) distribution of the terrain. This article presents a spatio‐temporal interpolation method which semantically models LULC information for the analysis of LST. The proposed spatio‐temporal semantic kriging (ST‐SemK) approach is presented in two variants: non‐separable ST‐SemK (ST‐SemK_NSep) and separable ST‐SemK (ST‐SemK_Sep). Empirical studies have been carried out with derived Landsat 7 ETM+ satellite images of LST for two spatial regions: Kolkata, India and Dallas, Texas, U.S. It has been observed that semantically enhanced spatio‐temporal modeling by ST‐SemK yields more accurate prediction results than spatio‐temporal ordinary kriging and other existing methods.     

2018?2019年舟山近海浮游动物群落结构春季年际变化及其与水团的关系

根据2018?2019年春季两个航次在舟山近海进行的浮游生物调查结果,对舟山近海的浮游动物群落结构(类群组成、优势种数量)年际变化进行了研究,利用典范对应分析(Canonical Correspondence Analysis, CCA)研究了两年春季浮游动物类群组成差异、优势种变化的原因,初步探讨了春季浮游动物群落结构动态变化的机制。结果表明:根据表层温度(Sea Surface Temperature,SST)、表层盐度(Sea Surface Salinity,SSS)的聚类分析,将该区域分为3个水团:杭州湾内水团(I区)、舟山本岛上升流水团II区)、舟山近海水团(III区)。不同水团对浮游动物类群组成影响显著,引起2018年和2019年春季3个水团区差异的主要贡献种(贡献率>10%)均为中华哲水蚤,同一水团两年间年际差异的贡献种如下:I区为捷氏歪水蚤(56.91%)和真刺唇角水蚤(12.34%);II区为中华哲水蚤(72.64%)、五角水母(13.35%);III区为中华哲水蚤(41.93%)、夜光虫(22.94%)。CCA分析表明,第1 CCA轴(CCA1)和第2 CCA轴(CCA2)共解释了两年春季浮游动物优势种累计方差的46.14%和物种?环境累计方差的97.82%。CCA1主要反映了空间(近海水团和湾内水团)的差异。CCA2主要反映了2018年和2019年站位的年际差异。盐度是影响春季浮游动物群落结构空间差异的主要因素,而温度、叶绿素a浓度是春季浮游动物群落结构年际差异的主要因素。     

一种用于海洋综合观测浮标的多种通信方式集成系统

为了优化海洋综合观测浮标的通信系统,设计了一种通信方式集成系统,将多种通信模块进行集成管理,并在每个数据发送周期进行通信信号检测,经过比较选择最优的通信方式进行数据传输。该系统具有采集数据完整、数据冗余小、运行功耗低等优点,有效增强了浮标的通信能力,完善了原有通信系统的功能,并且后期还具备较强的可扩展性功能,如浮标舱内环境监测和独立定位等,进一步增强浮标的安全性。该系统已经完成12个月的海上试运行,系统运行稳定,功能达到预期,可满足海洋综合观测浮标对多种通信方式进行优化管理的需求。     

基于AHP方法与GIS技术的海底管道路由选择研究

海底管道路由选择与海底管道建设、运营以及后期管理等工作存在密切联系,对管道工程经济性、安全性和合理性有着重要意义.考虑影响海底管道路由选择的自然与社会环境因素,构建了量化的评价体系,以AHP层次分析方法作为数学依据确定评价权重,建立了标准化的路由选择评判模型.进一步,将该模型与GIS空间分析技术相结合,生成以地图可视化...     

内蒙古北山地区阿民乌素公婆泉组变质火山岩年代学、地球化学特征及地质意义

内蒙古北山地区阿民乌素一带公婆泉组变质火山岩主要由钠长阳起岩、斜长阳起岩和斜长阳起片岩组成.三者主量元素显示相对高钠w(Na2O)=0.32％～2.46％,低钾w(K2O)=0.08％～0.38％、钛w(TiO2)=0.93％～1.03％,略富镁 w(MgO)=9.61％～12.04％、钙 w(CaO)=9.96％～1...