检索结果-南通市图书馆

journal of China University of Geosciences 2005年第1期16卷 38-44页

作者： malogo j m kongola School of Resources and Civil Engineering Northeastern University Shenyang 110004 China

Noise removal routines (destriping) were performed on Landsat ETm+ data as adjustments for atmospheric and distortion factors, prior to further image enhancement and interpretation. The image enhancement techniques were contrast stretching, density slicing, spatial filtering, Fourier analysis, brightness inversion, band combinations, and band ratioing. It has been revealed that, owing to the presence of gossans at Paishanlou, the mixture of iron oxide and clay minerals affects the spectral reflectance in satellite data. The mineral and hydrothermal composite images with band ratios 5/7+5/4+3/1 RGB and 5/7+3/1+4/3 RGB, respectively, yielded the best results for their sensitivity to lithologic variables, and lack of statistical redundancy. Ratio 3/1 clearly highlighted ferric (Fe 3+ ) iron; 5/4 depicted ferrous (Fe 2+ ) iron, and 5/7 depicted clays, carbonates, and hydroxyl bearing minerals. Vegetation was also successfully discriminated by ratio 5/7. Finally, coupled with field surveys, petrographical and geochemical data, the observed anomalies led to the discovery of three new sites, which are gold mineralized. The prime objective of this study was to map supergene and/or hypogene signatures in the gold mineralized areas using Landsat ETm+ data at Paishanlou.

关键词： gold signatures hypogene/supergene alteration Landsat ETm+.

Gold minerogenetic Prognosis Using Satellite Data:Case Study of Paishanlou Gold mine, Liaoning Province, China

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journal of China University of Geosciences 2005年第3期16卷 250-255页

作者： malogo j m kongola School of Resources and Civil Engineering Northeastern University Shenyang 110004 China

The major scientific goal of using satellite data for mineral prospecting in the study area was two-fold：（a） mapping geology, faults and fractures that localize ore deposits; （b） recognizing hydrothermally altered rocks by interpreting their spectral signatures. The lithology, properties, and geological relations of the rocks were key to understanding such varied phenomena as convection, melting and transport mechanisms, rock deformation and alteration, the sources of magnetic anomalies, and the hydrothermal circulation and formation of gold deposits. Satellite data were enhanced using the following techniques： band combinations, ratios, directional sharpening filtering, Laplacian transform, spatial convolution, and density slicing. By mapping a larger area, the Paishanlou Gold mine was discovered to be located within an accommodation zone, with three significant populations of faults having bearings of 95, 145, and 180 degrees. Faults bearing 145 degrees make up the faults of the main shear zone. The faults bearing 180 degrees have large sinistral offsets, typically 1.5 km, and form a synthetic-antithetic set with the faults bearing 145 degrees, which have dextral displacements of tens of meters. In the Landsat ETm＋ image composed of bands 7-4-2 RGB, gneiss rocks were clearly seen as red purple, and granitic and plagioclase bodies in pale brown/pink. The strongest alteration signature in the image was found along the detachment fault antiform located closest to the mine and the plutons responsible for the Paishanlou gold mineralization. Satellite image interpretation coupled with field surveys led to the identification of iron mineral composites, hydrothermally altered areas, fractures, and an accommodation zone. These anomalies finally resulted in the discovery of three new gold-mineralized sites.

关键词： image enhancement accommodation zones fractures hydrothermal alteration

通过遥感对矿产资源开采中环境影响的研究——以阜新煤矿和排山楼金矿为例(英文)

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地质与资源 2005年第1期14卷 46-52页

作者： malogo j.m.kongola 王恩德东北大学资源与土木工程学院辽宁沈阳110004

阜新地区地处华北地台,富含煤和金矿床.呈东西向分布的太古宙和元古宙变质地层在华力西期、印支期和燕山期的变形和岩浆活动中发生隆起.金矿赋存于隆起的前寒武纪变质岩石中.成煤期为晚石炭—早二叠纪、早中侏罗纪、晚侏罗—早白垩纪.... 详细信息

阜新地区地处华北地台,富含煤和金矿床.呈东西向分布的太古宙和元古宙变质地层在华力西期、印支期和燕山期的变形和岩浆活动中发生隆起.金矿赋存于隆起的前寒武纪变质岩石中.成煤期为晚石炭—早二叠纪、早中侏罗纪、晚侏罗—早白垩纪.阜新煤矿和排山楼金矿是辽宁省的主要煤、金产地.由于开采物中的有用物质只占很小的比例,因此提取有用物质的方式不可避免地要破坏当地的环境.矿山开采的每一步骤都对环境产生着负面影响.应用遥感资料进行矿山管理,是采用基于地表物体光谱反射的可视近红外(V N IR )遥感和短波红外(SW IR )遥感,以及基于物体热发光的热红外(TIR )遥感,利用不同的地表光谱反射,将相似的物体区分、分类、填图,并进行土地资源分析.野外工作包括在阜新煤矿和排山楼金矿确定岩石蚀变类型,采集标本,构造测量,对矿山环境进行数码拍照.陆地卫星m SS、Tm 和E Tm +数据是分析研究的基础.应用E R D A S Im A G IN G 软件处理卫星数据.并用E R D A S m apSheets 和V iew Finder 软件划图.应用各种图像处理技术进行图像增强和物体分辨.从卫星图像上直接测量排山楼金矿和阜新煤矿露天采场的多边形周长和面积.从卫星图像上可以看出,阜新煤矿从1980年到2000年环境的恶化.矿山开采产生的废矿堆不仅对矿区造?

关键词：阜新煤矿排山楼金矿遥感技术矿产资源环境影响

利用卫星数据建立排山楼热液石英脉型金矿模型(英文)

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地质与资源 2005年第4期14卷 297-304,313页

作者： malogo j.m.kongola 王恩德东北大学资源与土木工程学院辽宁沈阳110004

航天矿床标志模型(SDS)是遥感技术在矿床勘探中应用的结果.在遥感数据(陆地卫星m S、Tm和E Tm+图像)解译、地质特征及金矿化类型研究的基础上,总结了不同控矿因素及其鉴别特征.通过如下步骤建立模型:1)选择适当的图像处理技术;2)研究主... 详细信息

航天矿床标志模型(SDS)是遥感技术在矿床勘探中应用的结果.在遥感数据(陆地卫星m S、Tm和E Tm+图像)解译、地质特征及金矿化类型研究的基础上,总结了不同控矿因素及其鉴别特征.通过如下步骤建立模型:1)选择适当的图像处理技术;2)研究主要控矿因素(构造、地层、蚀变);3)确定鉴别标志,建立矿床图像模型,优化找矿靶区.应用该模型优化靶区已获得成功.卫星影像处理显示,在3个区域(南带、中带、北带)具有反映金成矿的强烈蚀变特征.实地调查证明,这3个预测区具有金矿化,它们与常规勘探方法(地球物理、地球化学)发现的其他矿化相似.该模型在排山楼地区的应用结果表明,卫星数据在金矿普查中可以发挥重要作用.

关键词：航天矿床标志模型(SDS) 断裂热液蚀变标志排山楼金矿

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辽宁排山楼金矿围岩的岩石学特征(英文)

地质与资源 2004年第2期13卷 85-95页

作者： malogo j. m. kongola 王恩德于明旭 moustafa El Omella 东北大学资源与土木工程学院辽宁沈阳110004

Standard laboratory procedures and remote sensing techniques were employed in the characterization of gold bearing rocks of the Paishanlou area. Results indicate that, the rocks were formed in an alteration complex of medium temperature and pressure. The area was under intense polymetamorphism (ductile shearing, and hydrothermal metamorphism), which occurred along the deformation zone stretching from jinzhou to Fuxin. The area bears some propylitic, phyllic (or sericitic) and argillic alteration styles. Gold minerals are contained in fine grained pyrite in silicified zones, and associated with metamorphosed Precambrian rocks. The host rock is composed of gneiss, mylonite and trondhjemite granite, and has a distinctive gold lead geochemical affinity.

关键词： gold host rocks tectonic movements ductile shearing alteration mineralization

Frequency-dependent viscoelasticity effects on the wave attenuation performance of multi-layered periodic foundations

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Applied mathematics and mechanics(English Edition) 2024年第3期45卷 407-424页

作者： m.SAFI m.VAKILIFARD m.j.mAHmOODI Faculty of Civil Water&Environmental EngineeringShahid Beheshti UniversityTehran ***Iran Faculty of mechanical and Energy Engineering Shahid Beheshti UniversityTehran ***Iran

In this paper,layered periodic foundations(LPFs)are numerically examined for their responses to longitudinal and transverse modes in the time and frequency *** different unit-cells,i.e.,2-layer,4-layer,and 6-layer unit-cells,comprising concrete/rubber,concrete/rubber/steel/rubber,and concrete/rubber/steel/rubber/lead/rubber materials,respectively,are taken into ***,the viscoelasticity behavior of the rubber is modeled with two factors,i.e.,a frequency-independent(FI)loss factor and a linear frequency-dependent(FD)loss *** the extraction of the complex dispersion curves and the identification of the band gaps(BGs),the simulations of wave transmission in the time and frequency domains are performed using the COmSOL *** parametric studies evaluate the effects of the rubber viscoelasticity models on the dispersion curves and the wave transmission for the longitudinal and transverse *** results show that considering the rubber viscoelasticity enhances the wave attenuation ***,the transverse-mode damping is more sensitive to the viscoelasticity model than its longitudinal *** 6-layer unit-cell LPF exhibits the lowest BG,ranging from 4.8 Hz to 6.5 Hz.

关键词： layered metamaterial periodic foundation complex dispersion curve wave transmission diagram

Selection of digital fabrication technique in the construction industry--A multi-criteria decision-making approach

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Frontiers of Structural and Civil Engineering 2024年第7期18卷 977-997页

作者： m.P.SALAImANImAGUDAm j.jAYAPRAKASH Department of Structural and Geotechnical Engineering School of Civil EngineeringVellore Institute of TechnologyVellore 632014India

Digital fabrication techniques,in recent decades,have provided the basis of a sustainable revolution in the construction ***,selecting the digital fabrication method in terms of manufacturability and functionality requirements is a complex *** paper presents alternatives and criteria for selection of digital fabrication techniques by adopting the multi-criteria decision-making *** alternatives considered in the study are concrete three-dimensional(3D)printing,shotcrete,smart dynamic casting,material intrusion,mesh molding,injection concrete 3D printing,and thin forming *** criteria include formwork utilization,reinforcement incorporation,geometrical complexity,material enhancement,assembly complexity,surface finish,and build *** demonstrates different multi-criteria decision-making techniques,with both subjective and objective weighting *** given ranking is based on the current condition of digital fabrication in the construction *** study reveals that in the selection of digital fabrication techniques,the criteria including reinforcement incorporation,build area,and geometrical complexity play a pivotal role,collectively accounting for nearly 70% of the overall *** the evaluated techniques,concrete 3D printing emerged as the best performer,however the shotcrete and mesh molding techniques in the second and third positions.

关键词： digital fabrication multicriteria decision-making concrete 3D printing

Lattice Boltzmann method formulation for simulation of thermal radiation effects on non-Newtonian Al_(2)O_(3) free convection in entropy determination

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Applied mathematics and mechanics(English Edition) 2024年第6期45卷 1085-1106页

作者： m.NEmATI m.SEFID A.KARImIPOUR A.j.CHAmKHA Faculty of mechanical Engineering Yazd UniversityYazd ***Iran Department of mechanical Engineering Najafabad BranchIslamic Azad UniversityNajafabad ***Iran Faculty of Engineering Kuwait College of Science and TechnologyDoha 35004Kuwait

The simultaneous investigation on the parameters affecting the flow of electrically conductive fluids such as volumetric radiation,heat absorption,heat generation,and magnetic field(mF)is very vital due to its existence in various sectors of industry and *** present research focuses on mathematical modeling to simulate the cooling of a hot component through power-law(PL)nanofluid convection *** temperature reduction of the hot component inside a two-dimensional(2D)inclined chamber with two different cold wall shapes is *** formulation of the problem is derived with the lattice Boltzmann method(LBm)by code writing via the FORTRAN *** variables such as the radiation parameter(0–1),the Hartmann number(0–75),the heat absorption/generation coefficient(−5–5),the fluid behavioral index(0.8–1.2),the Rayleigh number(103–105),the imposed mF angle(0°–90°),the chamber inclination angle(−90°–90°),and the cavity cold wall shape(smooth and curved)are *** findings indicate that the presence of radiation increases the mean Nusselt number value for the shear-thickening,Newtonian,and shear thinning fluids by about 6.2%,4%,and 2%,*** most cases,the presence of nanoparticles improves the heat transfer(HT)rate,especially in the cases where thermal conduction dominates *** is the lowest cooling performance index and mF effect for the cavity placed at an angle of 90°.The application in the design of electronic coolers and solar collectors is one of the practical cases of this numerical research.

关键词： thermal performance analysis heat absorption/generation power-law(PL)Al_(2)O_(3)nanofluid magnetohydrodynamics natural convection volumetric radiation inclined cavity

Consumer transparency in the production chain for plant varieties produced using new genomic techniques

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aBIOTECH 2024年第2期5卷 239-246页

作者： j.m.Lukasiewicz C.C.m.van de Wiel L.A.P.Lotz m.j.m.Smulders Wageningen University&Research P.O.Box 386NL-6700 AJ WageningenThe Netherlands

Plants edited with new genomic techniques(NGTs)currently fall under the Genetically modified Organisms Directive(2001/18/EC)in the European *** the proposal of the European Commission,NGT plants are partially exempted from the regulations of this *** proposal makes a distinction between two categories of NGT plants:NGT-1 and ***-1 category plants are considered equal to plants obtained through conventional breeding *** plants will not be labelled for the consumer,although they will be labelled as ***-2 category plants may be labelled with additional information as a positive *** of seeds of varieties made with gene editing,but not the products,would mean that most steps in the production chain are transparent,but not the last step towards ***“right to know”and increasing knowledge of gene-edited food is a common theme in food labelling towards ***,we describe current labelling regimes and registers and how these may be applied to provide transparency on gene-edited products to ***,we also look into consumer studies,which indicate a greater acceptance of gene-edited food among consumers,especially when additional benefits such as sustainability are mentioned.

关键词： Labelling New genomic techniques Consumer transparency Plant products

Europium recovery process by means of polymeric nanoparticles functionalized with acrylic acid,curcumin and fumaramide

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journal of Rare Earths 2024年第10期42卷 1950-1959页

作者： P.A.martínez-montoya j.m.del Río A.de j.morales-Ramirez m.Corea Escuela Superior de Ingeniería Química e Industrias Extractivas ESIQIE-IPNDepartamento de Ingeniería Metalúrgica UPALM S/N Col.Lindavista Escuela Superior de Ingenieria Química e Industrias Extractivas ESIQIE-IPNLaboratorio de Investigación en Polímeros y NanomaterialesUPALM S/N Col.Lindavista Centra de Investigación e Innovación Tecnológica CIITEC-IPNCda.de CECATIs/n

Polymeric nanoparticles of poly(methyl methacrylate) were obtained by emulsion polymerization techniques in a proce ss of two *** particles were functionalized with acrylic acid,curcumin,and fumaramide and three series of polymeric particles were *** incorporation of functional groups was confirmed by Fourier transform-infrared spectrosocopy(FT-IR) and ultraviolet-visible(UV-Vis) *** spherical morphology of particles with an average diameter of 100 nm was observed by scartning electron microscopy(SEm).The polymeric materials were used for recovery of [Eu]from synthetic *** nanoparticles show excellent chelation capacity to trap rare-earth ions,because they recover more than 85% of [Eu] at pH of *** images of SEm after extraction process show arrays between particles with larger average particle sizes to 1.5 *** addition,the particles have a good stripping capacity,exceeding 50% of it,maintaining their homogeneity in morphology and good stability in dispersion for the recovery and stripping processes.A pseudo-second model order is obtained for the extraction and stripping processes while the best results of stripping process are obtained at pH of6.

关键词： Chelating effect Emulsion polymerization Extraction process Rare earths Stripping process [Eu]recovery