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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

Experimental Analysis of Atypically Long Finned Oscillating Heat Pipe for Ventilation Waste Heat Recovery Application

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Journal of Thermal Science 2020年第3期29卷 667-675页

作者： mAHAJAN Govinda CHO Heejin SmITH Aaron THOmPSON Scott m. Rheem manufacturing MontgomeryAL 36109USA Department of mechanical Engineering Mississippi State UniversityMsissippi StateMS 39762USA Department of mechanical Engineering Auburn UniversityAubumnAL 36849USA

Oscillating heat pipes(OHP)which are constructed from a serpentine-arranged capillary tube possess a desirable aerodynamic form factor and provide for relatively high heat transfer rates via cyclic evaporation and condensation of an encapsulated working fluid with no internal wicking structure *** last two decades,OHP has been extensively investigated for its potential application in thermal management of various *** study presents an experimental investigation on the heat transfer performance of an atypically long finned *** heat transfer performance of the proposed OHP was analyzed and compared with a bare tube OHP with similar overall *** show that a unit row of finned OHP filled with n-pentane with fill ratio of 70%can recover up to(400±40)W of heat from a typical waste exhaust air *** additional pressure drop due to fins was estimated to be(6.8±2)Pa resulting in an increase of 1–2 W of fan power *** average heat recovery rate via finned OHP was found to be almost 80%more than bare tube OHP filled with same working fluid with same fill ratio.

关键词： oscillating heat pipe waste heat recovery ventilation

Parametric Study of Turbulent Flow in a Three-Dimensional Side-Dump Combustor

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Journal of Thermal Science 1993年第4期2卷 282-287页

作者： T.m.Liou Department of Power mechanical Engineering National Tsing Hua University

Turbulent flows in a three-dimensional side-dump combustor under various side-inlet angles and head heights are presented in terms of the axial mean velocity,swirl intensity,size of the head recirculation zone,and fraction of the inlet mass flow rate transported into the head *** turbulence model adopted is the algebraic Reynolds stress(k-ε-A)*** effect of the side-inlet angle and the head height on the characteristics of the confined impinging flows are documented and some improved explanations to the existence of the optimum inlet angle and head height are addressed in this study.

关键词： k-ε-A model side-dump combustor side-inlet angle head height

Carbon capture for decarbonisation of energy-intensive industries:a comparative review of techno-economic feasibility of solid looping cycles

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Frontiers of Chemical Science and Engineering 2022年第9期16卷 1291-1317页

作者： mónica P.S.Santos Dawid P.Hanak Energy and Power School of WaterEnergy and EnvironmentCranfield UniversityBedfordshire MK430ALUK

Carbon capture and storage will play a crucial role in industrial ***,the current literature presents a large variability in the techno-economic feasibility of CO_(2)capture ***,reliable pathways for carbon capture deployment in energyintensive industries are still *** work provides a comprehensive review of the state-of-the-art CO_(2)capture technologies for decarbonisation of the iron and steel,cement,petroleum refining,and pulp and paper *** scrubbing was shown to be the least feasible option,resulting in the average avoided CO_(2)cost of between 62.7∈t_(CO_(2))^(-1)for the pulp and paper and 104.6∈t_(CO_(2))^(-1)for the iron and steel *** average equivalent energy requirement varied between 2.7(iron and steel)and 5.1mJ_(th)·kg_(CO_(2))^(-1)(cement).Retrofits of emerging calcium looping were shown to improve the overall viability of CO_(2)capture for industrial *** looping was shown to result in the average avoided CO_(2)cost of between 32.7(iron and steel)and 42.9(cement).Its average equivalent energy requirement varied between 2.0(iron and steel)and 3.7(pulp and paper).Such performance demonstrated the superiority of calcium looping for industrial *** work should focus on standardising the techno-economic assessment of technologies for industrial decarbonisation.

关键词： industrial CO_(2)emissions CCS deployment carbonate looping net-zero industry carbon capture benchmarks

Homogeneous Plastic Flow of Fully Amorphous and Partially Crystallized Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5) Bulk metallic Glass

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Journal of materials Science & Technology 2003年第6期19卷 557-560页

作者： Q.WANG J.J.Blandin m.Suery B.Van de moortele J.m.Pelletier GPm2 ENSPG D.U. B.P.46 38042 Grenoble France Institute of Materials Shanghai University Shanghai 200072 ChinaGPM2 ENSPG D.U. B.P.46 38042 Grenoble FranceGPM2 ENSPG D.U. B.P.46 38042 Grenoble FranceGEMPPM Bat. B. PascalINSA 69621 Villeurbanne Cedex FranceGEMPPM Bat. B. PascalINSA 69621 Villeurbanne Cedex France

The homogeneous plastic flow of fully amorphous and partially crystallized Zr(41.2)Ti(13.8)Cu(12.5)Ni(10)Be(22.5) bulk metallic glass (Vitl) has been investigated by compression tests at high temperatures in supercooled liquid region. Experimental results show that at sufficiently low strain rates, the supercooled liquid of the fully amorphous alloy reveals Newtonian flow with a linear relationship between the flow stress and strain rate. As the strain rate is increased, a transition from linear Newtonian to nonlinear flow is detected, which can be explained by the transition state theory. Over the entire strain rate interval investigated, however, only nonlinear flow is present in the partially crystallized alloy, and the flow stress for each strain rate is much higher. It is found that the strain rate-stress relationship for the partially crystaltized alloy at the given temperature of 646 K also obeys the sinh law derived from the transition state theory, similar to that of the initial homogeneous amorphous alloy. Thus, it is proposed that the flow behavior of the nanocrystalline/amorphous composite at 646 K is mainly controlled by the viscous flow of the remaining supercooled liquid.

关键词： Homogeneous plastic flow Zr41.2Ti13.8Cu12.5Ni10Be22.5 amorphous alloy,Partially crystallized amorphous alloy

Von Kármán rotating flow of maxwell nanofluids featuring the Cattaneo-Christov theory with a Buongiorno model

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Applied mathematics and mechanics(English Edition) 2020年第8期41卷 1195-1208页

作者： A.AHmED m.KHAN J.AHmED A.HAFEEZ Department of mathematics Quaid-i-Azam UniversityIslamabad 44000Pakistan Department of Basic Sciences University of Engineering and TechnologyTaxila 47050Pakistan

This research paper analyzes the transport of thermal and solutal energy in the maxwell nanofluid flow induced above the disk which is rotating with a constant angular *** significant features of thermal and solutal relaxation times of fluids are studied with a Cattaneo-Christov double diffusion theory rather than the classical Fourier’s and Fick’s laws.A novel idea of a Buongiorno nanofluid model together with the Cattaneo-Christov theory is introduced for the first time for the maxwell fluid flow over a rotating ***,the thermal and solutal distributions are controlled with the impacts of heat source and chemical *** classical von Karman similarities are used to acquire the non-linear system of ordinary differential equations(ODEs).The analytical series solution to the governing ODEs is obtained with the well-known homotopy analysis method(HAm).The validation of results is provided with the published results by the comparison *** graphically presented outcomes for the physical problem reveal that the higher values of the stretching strength parameter enhance the radial velocity and decline the circumferential *** increasing trend is noted for the axial velocity profile in the downward direction with the higher values of the stretching strength *** higher values of the relaxation time parameters in the Cattaneo-Christov theory decrease the thermal and solutal energy transport in the flow of maxwell *** higher rate of the heat transport is observed in the case of a larger thermophoretic force.

关键词： maxwell fluid nanoparticle Cattaneo-Christov theory rotating disk homotopy analysis method(HAm)

Chemical Kinetic Aspects of Solid State Reaction Producing Wollastonite from Rice Husk Silica and Limestone

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Journal of materials Science & Technology 2001年第2期17卷 243-246页

作者： m.S.Nizami PCSIR Laboratories Complex, Lahors, Pakistan m.Z.Iqbal Punjab University, Institute of Chemistry, Lahors, Pakistan PCSIR Lab. Complex Lahore Pakistan

An industrial mineral wollastonite (CaSiO3) was produced under solid state conditions from rice husk silica and limestone. Reaction was carried out at 900'C to 1300'C for 1 h. The product batches were subjected to XRD and chemical analysis techniques specific for wollastonite. mole fractions of different product batches were calculated on the basis of accumulated data to study the kinetics. Specific rate constants and reaction rate were also found out. Various probable models of mechanism for reaction were considered and testified with the laid down criterion for suggesting the suitable one. The resulting data were treated with Arrhenius equation as well and activation energy was calculated--therefrom. In addition to finding it's value from the slope of Arrhenius curve, an alternate method was also applied for this purpose. Both of the values were observed to be comparable. The activation energy required for performed reaction was found to be almost one third of that reported for synthesizing CaSiO3 by using quartz. This referred to the economical preparation of wollastonite by using rice husk as a source of silica instead of quartz.

关键词： Chemical Kinetic Aspects of Solid State Reaction Producing Wollastonite from Rice Husk Silica and Limestone rate

Hysteresis Loops and Phase Diagrams of the Spin-1 Ising model in a Transverse Crystal Field

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Chinese Physics Letters 2012年第1期29卷 194-197页

作者： S.Bouhou I.Essaoudi A.Ainane m.Saber J.J.de miguel m.Kerouad Laboratoire de Physique des materiaux et modelisations des Systemes Unite Associee au CNRST-URAC 08Department of PhysicsFaculty of SciencesUniversity of Moulay IsmailB.P.11201MeknesMorocco max-Planck-Institut fur Physik Complexer Systeme Nohnitzer Str.38D-01187 DresdenGermany Dpto.Fisica de la materia Condensada C-3 and Institut of Materials Sciences“Nicolas Cabrera”Univ.AutonomaCantoblanco E-28049-MadridSpain

Within the framework of the effective-field theory with a probability distribution technique,which accounts for the self-spin correlation functions,the ferromagnetic spin-1 Ising model with a transverse crystal field on honeycomb,square and simple cubic lattices is *** have investigated the effect of the transverse crystal field on the phase diagrams,magnetization,hysteresis loops and χ_(z,h) of the system.A number of interesting phenomena of the system are discussed.

关键词： transverse Ising crystal

Impact of Accelerated Ultraviolet Weathering on Polymeric Composite Insulators Under High Voltage DC Stress

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CSEE Journal of Power and Energy Systems 2022年第3期8卷 922-932页

作者： Israr Ullah muhammad Amin Haider Hussain m.Tariq Nazir Faculty of Electrical Engineering Ghulam Ishaq Khan Institute of Engineering Sciences and TechnologyTopiSwabiKPK23460Pakistan School of mechanical and manufacturing Engineering University of New South Wales SydneyNSW 2052Australia School of Electrical Engineering and Telecommunications University of New South Wales SydneyNSW 2052Australia

This study investigates the weatherability of room temperature vulcanized(RTV)silicone rubber(SiR)and epoxybased material specimens with a composition of different nano and micro fillers against the collegial effects of high voltage DC,UV and temperature *** power transmission over long distances via HVDC is considered an economic option these days,so to ensure the system reliability,it is also critical to investigate these insulators under DC stress along with other environmental stresses(especially UV and temperature).For experimentation,composite samples *** epoxy(NE),epoxy with 15%micro SiO_(2)(EmS),epoxy with 5%nano SiO_(2)(ENS),neat SiR(NS),SiR with 15%micro SiO_(2)(SmS)and SiR with 5%nano SiO_(2)(SNS)are fabricated and subjected to accelerated aging in a weather chamber for 3,360 *** reveal that SmS and SNS offer better hydrophobic behavior followed by *** noticeable surface discoloration in the form of whitish shade with minor blackish spots is found in the case of SmS,while remaining samples also showed considerable color *** electron microscopy(SEm)and Fourier Transform Infrared Spectroscopy(FTIR)results showed that SNS and SmS presented quite excellent resistance to the exposure of *** and weight of all specimens are evaluated throughout the experiment and particularly for the water immersion ***,leakage current analysis indicated that SNS and SmS revealed high leakage current suppression compare to other *** indicate that SNS and SmS showed enhanced resistance against UV weathering under high voltage direct current stress.

关键词： Aging composites DC stress epoxy insulator UV SiR