检索结果-南通市图书馆

Mammal-bearing Pleistocene deposits,Vranic,southwestern Pannonian Basin System

Journal of Palaeogeography 2024年第3期13卷 430-452页

作者： Adriano Banak Zsòfia Ruszkiczay-Rüdiger Anita Grizelj Martina Đuras Kresimir Petrinjak ASTER Team Alexander Wieser Monika Milosevic Davor Pavelic department of geology Croatian Geological SurveyMilana Sachsa 2HR-10000 ZagrebCroatia Institute for Geological and Geochemical Research HUN-REN Research Centre for Astronomy and Earth Sciences(MTA Centre of Excellence)Budaorsi Street 451112 BudapestHungary The Faculty of Veterinary Medicine University of ZagrebHeinzelova 55HR-10000 ZagrebCroatia CEREGE CNRS-IRD-College de France-INRAE UM34Aix-Marseille UniversiteAix-en-ProvenceFrance Faculty of Physics-Isotope Physics University of ViennaWahringer Straße 171090 ViennaAustria Faculty of Mining Geology and Petroleum EngineeringUniversity of ZagrebPierottijeva 6HR-10000 ZagrebCroatia

Vranic site is a sand quarry that is located on the southern foothills of Papuk *** bottom to top of the succession,three sedimentary units have been recognized as:Unit 1 containing massive sand with scattered gravel-sized clasts,marl cobbles and boulders,and abundant marine mammal and fish fossils;Unit 2 consisting of sand intercalated with silt,clay and gravel,which may be horizontally bedded;and Unit 3,which is an erosionally-based lenticular matrix to clast-supported structureless *** basal part of Unit 1 shows numerous reworked skeletal remains of Miocene marine *** radionuclides constrain the age of burial of Unit 1 to 895±211 ka,while the source area of Unit 1 had a quick *** massive sands deposited on the slopes of Papuk Mountain were vulnerable to erosion due to the absence of *** rainfall or water from snow melting created flash floods that infiltrated the sands,thereby causing slope destabilization and *** process led to slumps that were transformed into a sandy debris *** sediment was probably deposited during the interglacial marine isotope age(MIS)21 period when the scarce vegetation and a warmer climate favored the melting of permafrost ice and consequently triggered slope movements during MIS *** reworked skeletal material sampled at the Vranic site comprises fossilized fish along with mammal bones and ***,the Vranic site represents an important site for cetacean fossil remains and serves as an important data source for marine life in the Central Paratethys.

关键词： Miocene marine mammals Alluvial slope deposit Pleistocene Cosmogenic nuclides Pannonian Basin System

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Applicability of Artificial Recharge of Groundwater in the Yongding River Alluvial Fan in Beijing through Numerical Simulation

引用

Journal of Earth Science 2014年第3期25卷 575-586页

作者： Qichen Hao Jingli Shao Yali Cui Zhenhua Xie School of Water Resources and Environment China University of Geosciences Beijing Institute of hydrogeology and engineering geology

A groundwater transient flow model was developed to evaluate the applicability and effectiveness of artificial recharge scenarios in the middle-upper part of the Yongding River alluvial fan in Beijing. These scenarios were designed by taking into account different types of recharge facilities and their infiltration rate with the Middle Route Project for South-to-North Water Transfer（MRP） as the recharge water source. The simulation results suggest that：（1） the maximum amount of artificial recharge water, for scenario I, would be 127.42×106 m3 with surface infiltration facilities; and would be243.48×106 m3 for scenario II with surface infiltration and recharge wells under the constraint of the upper limit of groundwater;（2） with preferred pattern of recharge facilities, groundwater levels in both optimized recharge scenarios would not exceed the upper limit within the given recharge period; and（3implementation of the recharge scenarios would efficiently increase the aquifer replenishment and the groundwater budget will change from-54.11×106 to 70.89×104 and 183.36×104 m3, respectively. In addition, under these two scenarios groundwater level would rise up to 30 and 34 m, respectively, without increasing the amount of evaporation. The simulation results indicate that the proposed recharge scenarios are practically feasible, and artificial recharge can also contribute to an efficient recovery of groundwater storage in Beijing.

关键词： groundwater modeling artificial recharge infiltration rate groundwater management.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A mathematical model of gas flow during coal outburst initiation

引用

International Journal of Mining Science and Technology 2019年第5期29卷 791-796页

作者： Dmytro Rudakov Valeriy Sobolev department of hydrogeology and engineering geology National Mining UniversityDnipro 49005Ukraine department of Construction Geotechnics and GeomechanicsNational Mining UniversityDnipro 49005Ukraine

A proposed concept of outburst initiation examines the release of a large amount of gas from coal seams resulted from disintegrating thermodynamically unstable coal organic matter(COM).A coal microstructure is assumed to getting unstable due to shear component appearance triggered by mining operations and tectonic activities considered as the primary factor while COM disintegration under the impact of weak electric fields can be defined as a secondary *** energy of elastic deformations stored in the coal microstructure activates chemical reactions to tilt the energy balance in a“coal–gas”*** on this concept a mathematical model of a gas flow in the coal where porosity and permeability are changed due to chemical reactions has been *** this model we calculated gas pressure changes in the pores initiated by gas release near the working face till satisfying force and energy criteria of *** simulation results demonstrated forming overpressure zone in the area of intensive gas release with enhanced porosity and *** calculated outburst parameters are well combined with those evaluated by field measurements.

关键词： Coal organic matter Coal meta-stability Outburst Gas flow Permeability Modeling

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

长壁放顶煤工作面沿空巷道的变形破坏机理

引用

Journal of Central South University 2024年第5期31卷 1542-1559页

作者：王浩森何满潮王炯王瑞明灿朱道勇马资敏 State Key Laboratory for Geomechanics and Deep Underground engineering China University of Mining&TechnologyBeijing 100083China NBK Institute of Mining engineering University of British ColumbiaVancouver BC V6T 1Z4Canada Mining engineering and geology College Xinjiang Institute of EngineeringUrumqi 830023China department of Earth Sciences University of FlorenceFirenze 50121Italy College of Water&Architectural engineering Shihezi UniversityShihezi 832003China School of Resource and Environmental engineering Shandong University of TechnologyZibo 255000China

本文利用物理和数值模型研究了长壁放顶煤工作面沿空巷道的变形和破坏机理。物理模型实验表明,长壁放顶煤工作面沿空巷道的变形破坏过程可分为四个阶段:初始变形阶段Ⅰ(相邻工作面后方-47~45 m)、快速变形阶段Ⅱ(45~150 m)、变形稳定阶... 详细信息

本文利用物理和数值模型研究了长壁放顶煤工作面沿空巷道的变形和破坏机理。物理模型实验表明,长壁放顶煤工作面沿空巷道的变形破坏过程可分为四个阶段:初始变形阶段Ⅰ(相邻工作面后方-47~45 m)、快速变形阶段Ⅱ(45~150 m)、变形稳定阶段Ⅲ(150~240 m)和压实稳定阶段IV(工作面后方240 m外)。值得注意的是,长壁放顶煤工作面沿空巷道围岩的大变形主要发生在快速变形阶段Ⅱ和变形稳定阶段Ⅲ。这主要是由沿空巷道上方的侧向悬臂梁结构旋转下沉过程中产生的应力集中造成的。因此,本文提出了一种创新方法,使用顶板预裂技术来优化巷道顶板结构,控制长壁放顶煤工作面沿空巷道围岩的大变形并自动留巷。数值模拟和现场应用表明,使用顶板预裂自动留巷技术后,长壁放顶煤工作面沿空巷道实体煤帮的支承压力、顶底板变形量和两帮变形量分别降低了6.49%、79.25%和60%。因此,顶板预裂自动留巷技术可以有效控制长壁放顶煤工作面沿空巷道的围岩大变形。本文所提出的长壁放顶煤工作面顶板预裂自动留巷技术可以为厚及特厚煤层综放工作面使用切顶卸压无煤柱自成巷技术提供参考。

关键词：物理模型实验变形机理沿空巷道顶板预裂

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Impacts of interactions with low-mineralized water on permeability and pore behavior of carbonate reservoirs

Energy Geoscience

引用

Energy Geoscience 2024年第4期5卷 278-290页

作者： Dmitriy A.Martyushev Inna N.Ponomareva Vasiliy I.Chernykh Shadfar Davoodi Yousef Kazemzadeh Tianshou Ma department of Oil and Gas Technologies Perm National Research Polytechnic UniversityPermRussia School of Earth Sciences&engineering Tomsk Polytechnic UniversityLenin AvenueTomskRussia Enhanced Oil Recovery(EOR)Research Center IOR/EOR Research InstituteShiraz UniversityShirazIran State Key Laboratory of Oil and Gas Reservoir geology and Exploitation Southwest Petroleum UniversityChengduSichuanPR China

Laboratory filtration experiments are employed to investigate effective well killing while minimizing its impacts on surrounding *** novelty of this experimental study lies in the prolonged exposure of rock samples to the killing fluid for seven days,corresponding to the average duration of well workovers in the oilfields in Perm Krai,*** findings indicate that critical factors influencing the interactions between rocks and the killing fluid include the chemical composition of the killing fluid,the mineralogical composition of the carbonate rocks,reservoir pressure and temperature,and the contact *** analyses using multi-scale X-ray computed tomography,field emission scanning electron microscopy,and X-ray diffraction were conducted on samples both before and after the well killing *** experiments were performed using real samples of cores,crude oil,and the killing *** results from this study indicate that low-mineralized water(practically fresh water)is a carbonate rock *** water causes the dissolution of rock components,the formation of new calcite crystals and amoeba-like secretions,and the migration of small particles(clay,quartz,and carbonates).The formation of deep channels was also *** assessment reveals that the change in the pH of the killing fluid indicates that the observed mineral reactions were caused by carbonate *** combined phenomena led to a decrease in the total number of voids in the core samples,which was 25%on average,predominantly among voids measuring between 45 and 70μm in *** change in the pore distribution in the bulk of the samples resulted in decreases in porosity of 1.8%and permeability of 67.0%in the studied core *** results from this study indicate the unsuitability of low-mineralized water as a well killing fluid in carbonate *** composition of the killing fluid should be optimized,for example,in terms of the ionic composition of water,

关键词： Fine particle Clay mineral Low-mineralized water Geochemical dissolution Carbonate reservoir

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tunnel behaviour and support associated with the weak rock masses of flysch

引用

Journal of Rock Mechanics and Geotechnical engineering 2014年第3期6卷 227-239页

作者： V.Marinos Laboratory of engineering geology and hydrogeology School of Geology Faculty of Sciences Aristotle University of Thessaloniki

Flysch formations are generally characterised by evident heterogeneity in the presence of low strength and tectonically disturbed structures. The complexity of these geological materials demands a more specialized geoengineering characterisation. In this regard, the paper tries to discuss the standardization of the engineering geological characteristics, the assessment of the behaviour in underground excava- tions, and the instructions-guidelines for the primary support measures for flysch layer qualitatively. In order to investigate the properties of flysch rock mass, 12 tunnels of Egnatia Highway, constructed in Northern Greece, were examined considering the data obtained from the design and construction records. Flysch formations are classified thereafter in 11 rock mass types （I-XI）, according to the siltstone -sandstone proportion and their tectonic disturbance. A special geological strength index （GSI） chart for heterogeneous rock masses is used and a range of geotechnical parameters for every flysch type is presented. Standardization tunnel behaviour for every rock mass type of flysch is also presented, based on its site-specific geotechnical characteristics such as structure, intact rock strength, persistence and complexity of discontinuities. Flysch, depending on its types, can be stable even under noticeable overburden depth, and exhibit wedge sliding and wider chimney type failures or cause serious deformation even under thin cover. Squeezing can be observed under high overburden depth. The magnitude of squeezing and tunnel support requirements are also discussed for various flysch rock mass types under different overburdens. Detailed principles and guidelines for selecting immediate support mea- sures are proposed based on the principal tunnel behaviour mode and the experiences obtained from these 12 tunnels. Finally, the cost for tunnel support from these experiences is also presented.

关键词： Flysch Geological strength index(GSI) Weak rock Tunnel behaviour Temporary support

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis, Characterization and Optical Morphology of ZnO Nanoparticles

引用

Open Journal of Applied Sciences 2024年第5期14卷 1330-1337页

作者： Aida Smajlagić Almedina Modrić-Šahbazović Zerina Sakić Elvir Babajić department of Chemistry Faculty of Natural Sciences and Mathematics University of Tuzla Tuzla Bosnia and Herzegovina department of Physics Faculty of Natural Sciences and Mathematics University of Tuzla Tuzla Bosnia and Herzegovina department of geology and Civil engineering Faculty of Mining University of Tuzla Tuzla Bosnia and Herzegovina

The ZnO molecule plays an important role in the industry due to it special features, anti-corrosion anti-bacterial properties, as well as due to its low electrical conductivity and heat resistance. In these experimental researches, the sol-gel method was chosen, which enables control of nucleation, aging and growth of particles in the solution. ZnO synthesis was prepared utilizing chemical method with Zinc acetate dyhidrate and NaOH with the appropriate methanol solvent and heating (60˚C). The methods used in identification and characterization are FTIR, UV/VIS, OPTICAL MICROSCOPY, SEM and XRD. The FTIR spectra of synthesized ZnO with corresponding ones show characteristic bands at the corresponding wavelengths, which confirm the presence of ZnO nanoparticles. SEM characterization of ZnO shows the morphology of needle-shaped nanoparticles. XRD spectar in this research by chemical method indicates the particle size of 17.76 nm.

关键词： Synthesis ZnO Nanoparticles Sol-Gel Method FTIR SEM XRD

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research on Formation Mechanisms of Hot Dry Rock Resources in China

引用

Acta Geologica Sinica(English Edition) 2016年第4期90卷 1418-1433页

作者： WANG Guiling LIN Wenjing ZHANG Wei LU Chuan MA Feng GAN Haonan Institute of hydrogeology and Environmental geology Chinese Academy of Geological Sciences

As an important geothermal resource, hot dry rock （HDR） reserves have been studied in many countries. HDR resources in China have huge capacity and have become one of the most important resources for the potential replacement of fossil fuels. However, HDR resources are difficult to develop and utilise. Technologies for use with HDR, such as high-temperature drilling, reservoir characterisation, reservoir fracturing, microseismic monitoring and high-temperature power stations, originate from the field of oil and drilling. Addressing how to take advantage of these developed technologies is a key factor in the development of HDR reserves. Based on the thermal crustal structure in China, HDR resources can be divided into four types： high radioactive heat production, sedimentary basin, modern volcano and the inner-plate active tectonic belt. The prospective regions of HDR resources are located in South Tibet, West Yunnan, the southeast coast of China, Bohai Rim, Songliao Basin and Guanzhong Basin. The related essential technologies are relatively mature, and the prospect of HDR power generation is promising. Therefore, analysing the formation mechanisms of HDR resources and promoting the transformation of technological achievements, large-scale development and the utilisation of HDR resources can be achieved in China.

关键词： HDR resources drilling technique genetic type resources distribution develop prospect

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Compressive performance of innovative reinforced pillars in closed/abandoned mines

引用

Journal of Central South University 2024年第8期31卷 2780-2793页

作者： LI Jian BAI Jin-wen FENG Guo-rui WANG Shan-yong ZHAO Hong-chao MI Jia-chen PAN Rui-kai SHI Xu-dong MA Jun-biao College of Mining engineering Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Shanxi Province for Mine Rock Strata Control and Disaster Prevention Taiyuan University of TechnologyTaiyuan 030024China Shanxi-Zheda Institute of Advanced Materials and Chemical engineering Taiyuan 030024China department of Mining engineering Shanxi Institute of EnergyJinzhong 030600China Priority Research Centre for Geotechnical Science and engineering School of Engineeringthe University of NewcastleCallaghanNSW 2308Australia School of geology and Mining engineering Xinjiang UniversityUrumqi 830000China

Pillar is closely related to the stability and reliability of underground spaces in closed/abandoned *** present research introduced a new technique to strengthen square cement mortar columns via fiber-reinforced polymer(FRP)strips to verify the strengthening effect of FRP on *** to a fully wrapped FRP jacket,the advantages of FRP strip are cost-effective and easy-to-construct.A series of compression tests as well as theoretical analysis were carried out to explore the mechanical behavior of square cement mortar specimens partially strengthened with FRP *** results verified the effectiveness of FRP strips in enhancing the stress and strain of cement *** from unconfined cement mortar specimens,these FRP-strengthened cement mortar specimens are featured with the double-peaked behaviors,mainly attributed to the stress state transformation from a one-dimensional to a three-dimensional stress *** also indicated that the enhancement of stress increased with the FRP strip ***,the brittle-ductile transition ductile failure characteristics were also observed in FRP-confined cement mortar *** ultimate ductility of the cement mortar specimen decreases gradually with the growth of the FRP strip *** main contribution of this research is to enrich the strengthening techniques for residual pillars.

关键词： fiber-reinforced polymer uniaxial compression partially strengthening double-peaked behaviors brittle-ductile transition

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Progress and prospect of mid-deep geothermal reinjection technology

引用

Journal of Groundwater Science and engineering 2024年第3期12卷 321-338页

作者： Jing Hu Yan-guang Liu Xin Wang Ying-nan Zhang Mei-hua Wei Jiangsu Universiy of Science and Technology Zhenjiang 212100JiangsuChina Institule of hydrogeology and Environmental geology Chinese Academy of Geological SciencesXiamen 3651021Fujian ProvinceChina School of Earth science and engineering Hebei University of EngineeringHandan 056009Hebei ProvinceChina Technology Innovation Center for Geothermal&Hot Dry Rock Exploration and Development Ministry of Natural ResourcesShijiazhuang 050061China Shanxit Key Laboratory for Exploration and Exploitation of Geothermal Resources Taiyuan 030024China.

Mid-deep geothermal reinjection technology is crucial for the sustainable development of geothermal resources,which has garnered significant attention and rapid growth in recent ***,various geothermal reinjection technologies lag behind,lacking effective integration to address issues like low reinjection rates and thermal *** paper reviews the basic principles and development history of mid-deep geothermal reinjection technology,focusing on various technical methods used in the process and analyzing their applicability,advantages,and disadvantages under different geological *** highlights the unique challenges posed by deep geothermal resources,including high temperature,high pressure,high stress,chemical corrosion,and complex geological ***,it addresses challenges in equipment selection and durability,system stability and operation safety,environmental impact,and sustainable ***,the paper explores future directions for mid-deep geothermal reinjection technology,highlighting key areas for further research and potential pathways for technological *** comprehensive analysis aims to accelerate the advancement of geothermal reinjection technology,offering essential guidance for the efficient reinjection and sustainable development of geothermal resources.

关键词： Middle and deep geothermal Geothermal reinjection Sustainable development Technological progress Research path

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：