检索结果-南通市图书馆

the geology, structure and mineralisation of the Oyu tolgoi porphyry copper-gold-molybdenum deposits, mongolia： A review

引用

Geoscience Frontiers 2016年第3期7卷 375-407页

作者： t.m.(mike) Porter Porter CeoConsultancy Ply Ltd. Linden Park 5065 SA Australia

the Oyu tolgoi cluster of seven porphyry Cu-Au-mo deposits in southern mongolia,define a narrow,linear,12 km long,almost continuously mineralised trend,which contains in excess of 42 mt of Cu and1850 t of Au,and is among the largest high grade porphyry Cu-Au deposits in the *** deposits lie within the Gurvansayhan island-arc terrane,a fault bounded segment of the broader Silurian to Carboniferous Kazakh-mongol arc,located towards the southern margin of the Central Asian Orogenic Belt,a collage of magmatic arcs that were periodically active from the late Neoproterozoic to Permotriassic,extending from the Urals mountains to the Pacific *** at Oyu tolgoi is associated with multiple,overlapping,intrusions of late Devonian（～372 to 370 ma） quartzmonzodiorite intruding Devonian（or older） juvenile,probably intra-oceanic arc-related,basaltic lavas and lesser volcaniclastic rocks,unconformably overlain by late Devonian（～370 ma） basaltic to dacitic pyroclastic and volcano sedimentary *** quartz-monzodiorite intrusions range from earlymineral porphyritic dykes,to larger,linear,syn-,late- and post-mineral dykes and *** was deposited within syn-mineral quartz-monzodiorites,but is dominantly hosted by augite basalts and to a lesser degree by overlying dacitic pyroclastic *** ore deposition,an allochthonous plate of older Devonian（or pre-Devonian） rocks was overthrust and a post-ore biotite granodiorite intruded at～365 *** is characterised by varying,telescoped stages of intrusion and *** A-type quartz veined dykes were followed by Cu-Au mineralisation associated with potassic alteration,mainly K-feldspar in quartz-monzodiorite and biotite-magnetite in basaltic *** reflux of cooled,late-magmatic hydrothermal fluid resulted in intense quartz-sericite retrograde alteration in the upper parts of the main syn-mineral intrusions,and an equivalent chlorite-muscovite/illite-hematite assemblage in bas

关键词： tectonic setting Porphyry copper-gold-molybdenum deposit High sulphidation Geology Alteration Structure

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

Application of In-Flight melting technology by RF Induction thermal Plasmas to Glass Production

引用

Plasma Science and technology 2008年第3期10卷 344-347页

作者：姚耀春 m.m.HOSSAIN t.WAtANABE F.FUNABIKI t.YANO National Engineering Laboratory of Vacuum metallurgy Kunming University of Science and Technology Kunming 650093 China Department of Environmental Chemistry and Engineering Tokyo Institute of Technology Yokohama 226-8502 Japan Department of Environmental Chemistry and Engineering Tokyo Institute of TechnologyYokohama 226-8502 Japan Department of Chemistry and materials Science Tokyo Institute of Technology Tokyo 152-8550 Japan

An innovative in-flight glass melting technology with induced thermal plasmas was developed for the purpose of energy conservation and environmental protection. two-dimensional modeling was used to simulate the thermofluid fields in the plasma torch. the in-flight melting behavior of glass raw material was investigated by various analysis methods. Results showed that the plasma temperature was up to 10000 K with a maximum velocity over 30 m/s, which made it possible to melt the granulated glass raw material within milliseconds. the carbonates in the raw material decomposed completely and the compounds in the raw material attainted 100% vitrification during the in-flight time from the nozzle exit to substrate. the particle melting process is similar to the unreacted-core shrinking model.

关键词： induced thermal plasmas in-flight melting plasma heat transfer glass production

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

Relationship between mODIS-NDVI data and wheat yield: A case study in Northern Buenos Aires province, Argentina

引用

Information Processing in Agriculture 2015年第2期2卷 73-84页

作者： mariano F.Lopresti Carlos m.Di Bella américo J.Degioanni Instituto Nacional de tecnología Agropecuaria(INtA) EEA PergaminoRuta 32 km 4.5Pergamino 2700Buenos AiresArgentina INtA-Castelar CNIAInstituto de Clima y AguaLas Cabanas y Los Reseros S/NHurlingham 1686Buenos AiresArgentina UNRC Facultad de Agronomía y VeterinariaDepartamento de Ecología AgrariaRuta Nacional 36 km 601Río Cuarto 5800Co´rdobaArgentina CONICEt–Consejo Nacional de Investigaciones Científicas y técnicas Argentina

In countries like Argentina,whose economy depends heavily on crop production,the estimation of harvests is an elementary *** providing objectivity,the use of remote sensing allows estimating yield in *** the time of maximum leaf area in wheat corresponds with the critical period of the crop,a good relationship is expected between the Normalized Difference Vegetation Index(NDVI)and *** present study was carried out in the North of Buenos Aires province,*** on the type of soil,the study area can be divided into two homogeneous subzones:a subzone with lower clay content in the southwestand a subzone with higher clay content in the *** growing seasons(2003–2011)were *** the first five years,an empirical model was calibrated and validated with field-observed wheat yields and mOD13q1 product-NDVI data,whereas in the other four years,the calibrated model was applied by means of yield maps and by comparing with official *** mOD13q1 image corresponding to Julian day 289 showed the best fit between NDVI and yield to estimate wheat yield *** yield maps,better weather conditions showedhigher yields and higher soil productivity presented a greater proportion of the area occupied by higher *** department level,an R2 value of 0.75 was found after relating the estimation of the calibrated empirical model with official *** method used allows predicting wheat yield 30 days before *** yield maps,the NDVI perceived the temporal and spatial variability in the study area.

关键词： Remote sensing Wheat NDVI Yield Empirical models mODIS

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

A modification of Extended Homoclinic test Approach to Solve the(3+1)-Dimensional Potential-YtSF Equation

引用

Chinese Physics Letters 2011年第4期28卷 4-7页

作者： m.t.Darvishi mohammad Najafi Department of mathematics Razi UniversityKermanshah 67149Iran

By means of the extended homoclinic test approach(EHtA)one can solve some nonlinear partial differential equations(NLPDEs)in their bilinear *** an NLPDE has no bilinear closed form we can not use this *** modify the idea of EHtA to obtain some analytic solutions for the(3+1)-dimensional potential-Yu-toda-Sasa-Fukuyama(YtSF)equation by obtaining a bilinear closed form for *** comparison of this method and other analytic methods,like Ham,HtA and three-wave methods,we can see that the new idea is very easy and straightforward.

关键词： method bilinear analytic

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

tuning the particle size,physical properties,and photocatalytic activity of Ag_(3)PO_(4)materials by changing the Ag^(+)/PO_(4)^(3-)ratio

引用

Chinese Physics B 2023年第3期32卷 561-568页

作者： Hung N m Oanh L t m Chung D P thang D V mai V t Hang L t minh N V Center for Nano Science and technology Hanoi National University of Education136 Xuan Thuy RoadCau Giay DistrictHanoi 100000Vietnam Department of Physics Hanoi National University of Education136 Xuan Thuy RoadCau Giay DistrictHanoi 100000Vietnam Hanoi University of mining and Geology Duc Thang WardNorth Tu Liem DistrictHanoi 100000Vietnam Institute of materials Science Vietnam Academy of Science and Technology18 Hoang Quoc VietHanoi 100000Vietnam Faculty of Basic Sciences Hanoi University of Natural Resources and Environment41 A Phu Dien RoadNorth Tu LiemHanoi 100000Vietnam

this study demonstrates the influence of the Ag^(+)/PO_(4)^(3-)ratio in precursor solution on the crystal structural formation,morphology,physical properties,and photocatalytic performance of a Ag_(3)PO_(4)photocatalyst that is fabricated,using a facile precipitation method,from AgNO_(3)and Na2HPO_(4)·12H_(2)*** material characterizations were carried out using x-ray diffraction(XRD),scanning electron microscopy(SEm),energy-dispersive x-ray spectroscopy(EDX),Brunauer–Emmett–teller(BEt)surface area,Fourier transform infrared(FtIR)absorption,Raman scattering,x-ray photoelectron spectroscopy(XPS),UV-vis absorption,and photoluminescence(PL).the results show that Ag_(3)PO_(4)crystallizes better when the excess PO_(4)^(3-)content increases,and the lattice parameters decrease slightly,while the crystal diameter and the particle size *** change is also observed in the Raman scattering and FtIR spectra with the increase in the vibration frequency of the[PO_(4)]*** compression of the[PO_(4)]unit was also confirmed in the XPS spectra with the shift of P 2p peaks toward higher binding *** photocatalytic results showed that the samples synthesized from excess PO_(4)^(3-)solution exhibited higher photocatalytic performance compared to the sample with a Ag^(+)/PO_(4)^(3-)ratio of 3:1.A sample prepared from the precursor solution with a Ag^(+)/PO_(4)^(3-)ratio of 3:1.5 was optimal for RhB decomposition under both visible light and natural sunlight,completely decomposing 10 ppm RhB after 15 minutes of xenon lamp irradiation and after 60 minutes under solar light *** is attributed to the high crystallinity,small particle size and low electron–hole recombination rate of the sample.

关键词： morphology photocatalytic Ag^(+)/PO_(4)^(3-)ratio visible light

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

Dirac R-matrix calculations of photoionization cross sections of Ni Ⅻ and atomic structure data of Ni 

引用

Chinese Physics B 2017年第2期26卷 127-140页

作者： R t Nazirt m A Bari m Bilal S Sardar m H Nasim m Salahuddin Department of Physics and Applied mathematics Pakistan Institute of Engineering and Applied Sciences Islamabad 45650 Pakista

We performed R-matrix calculations for photoionization cross sections of the two ground state configuration 3s^23p^5（~2P_（3/2,1/2）~o） levels and 12 excited states of Ni Ⅻ using relativistic Dirac Atomic R-matrix Codes（DARC） across the photon energy range between the ionizations thresholds of the corresponding states and well above the thresholds of the last level of the Ni XIII target ion. Generally, a good agreement is obtained between our results and the earlier theoretical photoionization cross sections. moreover, we have used two independent fully relativistic GRASP and FAC codes to calculate fine-structure energy levels, wavelengths, oscillator strengths, transitions rates among the lowest 48 levels belonging to the configuration（3s^23p^4, 3s3p^5, 3p^6, 3s^23p^33d） in Ni XIII. Additionally, radiative lifetimes of all the excited states of Ni XIII are presented. Our results of the atomic structure of Ni XIII show good agreement with other theoretical and experimental results available in the literature. A good agreement is found between our calculated lifetimes and the experimental *** present results are useful for plasma diagnostic of fusion and astrophysical plasmas.

关键词： photoionization cross sections energy levels wavelengths lifetimes

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 of crystalline perovskite-structured SrtiO_3 nanoparticles using an alkali hydrothermal process

引用

International Journal of minerals,metallurgy and materials 2016年第1期23卷 109-115页

作者： U.K.N.Din t.H.t.Aziz m.m.Salleh A.A.Umar Institute of microengineering and Nanoelectronics (ImEN) Universiti Kebangsaan Malaysia

We report an experimental route for synthesizing perovskite-structured strontium titanate （SrtiO3） nanocubes using an alkali hydrothermal process at low temperatures without further heating. Furthermore, we studied the influence of heating time （at 180℃） on the crystallinity, morphology, and perovskite phase formation of SrtiO3. the SrtiO3 powder, which is formed via nanocube agglomeration, transforms into cubic particles with a particle size of 120--150 nm after 6 h of hydrothermal sintering. the crystallinity and percentage of the perovskite phase in the product increased with heating time. the cubic particles contained 31.24at% anatase tiO2 that originated fi＇om the precursor. By varying the weight ratio of anatase tiO2 used to react with the strontium salt precursor, we reduced the anatase-tiO2 content to 18.8at%. However, the average particle size increased when the anatase-tiO2 content decreased.

关键词： strontium titanate nanoparticles anatase hydrothermal synthesis

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

timoshenko inclusions in elastic bodies crossing an external boundary at zero angle

引用

Acta mechanica Solida Sinica 2017年第3期30卷 327-333页

作者： A.m. Khludnev t.S. Popova Lavrentyev Institute of Hydrodynamics of R_AS Novosibirsk State University Novosibirsk 630090 Russia North-Eastern Federal University Yakutsk 677000 Russia

the paper concerns an analysis of equilibrium problems for 2D elastic bodies with a thin timoshenko inclusion crossing an external boundary at zero angle. the inclusion is assumed to be delaminated, thus forming a crack between the inclusion and the body. We consider elastic inclusions as well as rigid inclusions. to prevent a mutual penetration between the crack faces, inequality type boundary conditions are imposed at the crack faces. theorems of existence and uniqueness are established. Passages to limits are investigated as a rigidity parameter of the elastic inclusion going to infinity.

关键词： thin timoshenko inclusion Crack Delamination Fictitious domain method Non-penetration

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

Numerical damage evaluation of perforated steel columns subjected to blast loading

引用

Defence technology（防务技术） 2022年第5期18卷 735-746页

作者： mahmoud t.Nawar Ibrahim t.Arafa Osama m.Elhosseiny Structural Engineering Department Zagazig UniversityZagazig44519Egypt

the structural performance of perforated steel columns(PSCs)is significantly more complex than the one of solid web I-shaped elements under the diversity of blast loading *** damage criterion of PSCs is not only related to initial deformation response during the blast but also the residual axial load capacity and it can be considered as a reliable index after the blast ***,the PSCs damages will be studied in two stages;direct and post blast *** the present study,the dynamic response of PSCs was numerically evaluated under different levels of blast threats using LS-DYNA *** explicit finite element(FE)analyses are carried out to investigate the effect of various parameters,such as web opening shapes,boundary conditions and strengthening details on the damage index and toughness of the PSCs compared to the parent steel *** results of the comparative study show that the damage and toughness decrease when the support condition changes from pinned to fixed ends through the two stages of *** give high toughness compared to its parent sections during blast shock stage while,a remarkable decrease in toughness is observed during the application of axial gravity after blast ***,the web opening shapes have slight effects on the global dynamic behavior of PSCs,particularly in terms of residual *** the contrary,the retrofitting strategy using both closed holes at end and vertical stiffeners have an effective enhancement to get higher toughness in case of the extreme blasts.

关键词： Perforated steel columns Blast load Damage criterion Numerical modeling Explicit finite element analysis Web-opening shapes

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

the dynamic compensation temperature in a kinetic spin-5/2 Ising model on a hexagonal lattice

引用

Chinese Physics B 2013年第3期22卷 471-480页

作者： mt temizer Aysegl Ozkιlι Department of Physics Bozok University66200 YozgatTurkey Institute of Science Bozok University66200 YozgatTurkey

We present a study of the dynamic behavior of a two-sublattice spin-5/2 Ising model with bilinear and crystal-field interactions in the presence of a time-dependent oscillating external magnetic field on alternating layers of a hexagonal lattice by using the Glauber-type stochastic *** lattice is formed by alternate layers of spins σ=5/2 and S=5/*** employ the Glauber transition rates to construct the mean-field dynamic ***,we investigate the time variations of the average sublattice magnetizations to find the phases in the system and then the thermal behavior of the dynamic sublattice magnetizations to characterize the nature（first-or second-order） of the phase transitions and to obtain the dynamic phase transition（DPt） *** also study the thermal behavior of the dynamic total magnetization to find the dynamic compensation temperature and to determine the type of the dynamic compensation *** present the dynamic phase diagrams,including the dynamic compensation temperatures,in nine different *** phase diagrams contain seven different fundamental phases,thirteen different mixed phases,in which the binary and ternary combination of fundamental phases and the compensation temperature or the L-type behavior strongly depend on the interaction parameters.

关键词： kinetic Ising model dynamic phase transition dynamic compensation temperature

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

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：