K. Deng
,
Z.M. Ren
,
Y.B. Zhong
,
G.C. Jiang and S.M.Hu 1) School of Materials
,
Shanghai University
,
Shanghai 200072
,
China 2) Shanghai BAOSTEEL Group
,
Shanghai 200941
,
China
金属学报(英文版)
In this paper, coupling the quasi-3D numerical simulation of electromagnetic field and the experiments of continuous casting with soft-contacted mould with some metals such as tin, aluminum, copper and steel, the electromagnetic characteristics of continuous casting with soft-contacted mould is analyzed. It is shown that the electromagnetic pressure on the surface of billet is increasing with the rising of power frequency as a logarithmically parabolic function, with that of electric conductivity of billet as a power junction, and with that of the current in inductor as a parabolic junction.
关键词:
continuous casting (CC)
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null
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null
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null
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null
American Mineralogist
A natural high-pressure phase of titanium oxide with alpha-PbO2-structure has been found in omphacite from coesite-bearing eclogite at Shima in the Dabie Mountains, China. High-resolution transmission electron microscope observations have revealed an orthorhombic lattice, corresponding to alpha-PbO2-type TiO2, with cell parameters a = 0.461 nm, b = 0.540 nm, c = 0.497 nm and space group Pbcn. It occurs as nanometer-thick (< 2 nm) lamellae between multiple twinned rutile crystals, providing additional evidence of very high-pressure, metamorphism at 7 GPa, 900 degrees C. This implies subduction of continental material to a depth of more than 200 kilometers. alpha-PbO-type TiO2 could be an extremely useful index mineral for ultrahigh-pressure.
关键词:
high-pressure phase;ries crater;rutile;polymorph;titanium
Corrosion Engineering Science and Technology
Four kinds of imidazoline inhibitors with different hydrophilic group, i.e. carboxymertyl imidazoline (CMI-11), hydroxyethyl imidazoline (HEI-11), aminoethyl imidazoline (AEI-11) and imidazoline (IM-11) had been synthesised and characterised by infrared and ultraviolet spectra. The inhibition performance of these imidazoline inhibitors for CO(2) corrosion of N80 in 3%NaCl solution was investigated through linear polarisation resistance, polarisation curve and electrochemical impedance spectroscopy. In order to study the relationship between the molecular structure and inhibition properties of these imidazoline inhibitors, quantum chemical calculations have been also applied. The results showed that the presence of a hydrophilic group was beneficial to the corrosion inhibition properties of these imidazoline inhibitors, and the inhibition efficiency follows the order: CMI-11 > HEI-11 > AEI-11 > IM-11. The calculated quantum chemical parameters supported that the lower the lowest unoccupied and highest occupied molecular orbital energy gap, the higher the inhibition efficiency. The theoretical calculation was in good agreement with experimental results.
关键词:
carbon dioxide corrosion;corrosion inhibitor;imidazoline;hydrophilic;group;quantum chemical calculation;mild-steel;acidic media;impedance spectroscopy;molecular-structure;painted metals;eis;derivatives;efficiency
SUN Wenqiang
,
CAI Jiuju
,
MAO Hujun
,
GUAN Duojiao
钢铁研究学报(英文版)
As the largest energy consuming manufacturing sector and one of the most important sources of carbon dioxide (CO2) emissions, the China′s iron and steel industry has paid attention to the study of changing trend and influencing factors of CO2 emissions from energy use. The logarithmic mean Divisia index (LMDI) technique is used to decompose total change in CO2 emissions into four factors: emission factor effect, energy structure effect, energy consumption effect, and steel production effect. The results show that the steel production effect is the major factor which is responsible for the rise in CO2 emissions; whereas the energy consumption effect contributes most to the reduction in CO2 emissions. And the emission factor effect makes a weak negative contribution to the increase of CO2 emissions. To find out the detailed relationship between change in energy consumption or steel production and change in CO2 emissions, the correlation equations are also proposed.
关键词:
CO2 emissions
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energy use
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LMDI technique
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steel production
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energy consumption
High Pressure Research
The crystallization of amorphous SiO2 powder with free water and silicon-hydroxy group (Si-OH) was investigated in the range of 0-4.2GPa and 150-1200C. The samples were detected by X-ray diffraction, transmission electron microscopy, thermogravimetry and differential thermal analysis, Raman and Fourier transform-infrared spectroscopy. The results show that amorphous SiO2 can transform to cristobalite at 1000C under room pressure. Under high pressure, amorphous SiO2 can quickly transform into single-phase coesite at lower temperature, and the P-T boundary of the crystallization products of mat1 (-quartz and coesite) has been successfully obtained. Through comparing the crystallization products from amorphous SiO2 materials with the same grain size containing different forms of water under high pressure and high temperature, it is found for the first time that the synthesis of coesite can be quickened by virtue of Si-OH in the amorphous SiO2 at lower temperature. The single-phase coesite has been synthesized from amorphous SiO2 with Si-OH under 4.2GPa and 190C for 30min, and 190C is the lowest synthesis temperature of coesite so far.
关键词:
amorphous SiO2;-quartz;coesite;high pressure;silicon-hydroxy group;quartz;phase;transitions;exhumation;spectra;rocks
Xiaohong YAN
,
Jianwen DING
,
Qibin YANG
,
Bruno Iochum
材料科学技术（英文）
We present a new series of two-dimensional decagonal tilings which are connected with each in five transformation rules. In this case, a real-space renormalization group scheme is developed to study physical properties of the decagonal systems in terms of Green's function theory.
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