Materials Literature
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With analyzing the thermal boundan conditions in cooling process of U75 V steel rail, the temperature field of 100 in steel rail during cooling process at 845 ~ 150 ℃ before straightening has been calculated by using three-dimensional non-linear finite element method. Results showed that during cooling process the tem…
The 2 mm stainless steel clad plate was twice-compounded rolled by φ500 mm and φ350 mm mills with 304 (20 mm) / 440 (3.5 mm) / 304(20 mm) stainless steels stock. The results by mechanical properties test and stnic- ture observation showed that the tensile fracture samples of clad plate hadn't stratification phenomenon…
Influence of finishing temperature 810 ~960 ℃ and forging ratio 3 -6 on precipitation of ferrite in bainitic steel-0. 16C, 0.91 Si, 1.98Mnt 1.03Cr, 0. 17Mo, 0. 065V, 0. 001 Ti has been studied. Results showed that the critical temperature of phase transformation for austenite to ferrite increased by deformation of the…
Sheet piles are new environmental-protection construct steel products which wide apply in the fields such as wharf, dock, pier, dyke, embankment, retaining wal] and weir projects. The sheet piles have many advantages including high strength, light, waterproof, strong endurance, obvious environmental-protection effect,…
Precipitation conditions of magnesium oxide and its compounded inclusions in liquid in X80 pipeline steel was calculated by thermodynamics,that were calculating according to aim acid-soluble aluminium content 0.025% in pipe-line steel at 1873 K,as 0.0008%≤[Mg]≤0.0059%,the compounded inclusion MgO ·Al2O3formed in steel…
According to real-time data recording of cold water parameters for mold and temperature of copper plate measured by thermocouple during test of increasing cast speed of hypoperitectic AQ steel grade 230 mm ×1200 mm slab, and combined with math model and ANSYS commercial software,the influence of increasing casting spe…
With pulse current ( 2 600 V, 0. 862 Hz, capacitance of capacitor 200 μF) treated liquid 45 steel (0. 43% C) for 60 s before tapping from 10 kg medium frequency furnace ( before solidification) or with same pulse current treated liquid for 3. 5 min during solidified process in casting mold, it was found that both puls…
According to a 70 t ladle prototype at steel works, the water model with model-prototype linear scale ratio 1：2.75 has been established. The obtained critical blowing gas rate was 450 L/min by water modeling test to measure the rate of ladle bottom blowing argon in critical slag entrapment condition. The horizontal fl…
The 24 mm plate of 0. 069r ( Ti + B) microalloying 0. 17C-0.92Si-l. 63Mn steel was rolled by φ500 mm medium-heavy mill in laboratoiy from 135 mm cast slab. The effect of finishing rolling temperature, beginning and finishing water-cooling temperature on structure and mechanical properties of test steel was studied. Re…
Qualified surface treatment-alkali (lipping, acid pickling and activating treatment is foundation to form complete and compact phosphating film on surface of GCrl5 steel coil. With controlling the ratio of phosphating liquid total acidity and free acidity- 5. 5 ~ 7. 5 , phosphating temperature 70 ~80 °C . and using so…
Based on the physical and mathematical models for electroslag heating on surface of roll core, the thermoelectricity field of slag pool in roll core surface heating system and its influencing factors have been simulated by using large- scale finite element software ANSYS. Study results show that there is a strong curr…
We report the results of \textit{ab initio} simulations of the electronic properties of a chain of C$_{60}$ molecules encapsulated in a boron nitride nanotube - so called BN-nanopeapod. It is demonstrated that this structure can be effectively doped by depositing potassium atoms on the external wall of the BN-nanotube…
The antimicrobial activity of chitosan is unstable and sensitive to many factors such as molecular weight. Recent investigations showed that low molecular weight chitosan exhibited strong bactericidal activities compared to chitosan with high molecular weight. Since chitosan degradation can be caused by the coordinati…
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In this paper, we present our vision of what kind of wearable devices and how they can be powered by the heat of human beings and by using ambient light. The basic principles of designing body-powered devices and ways of their hybridizing with photovoltaic cells are discussed. The mechanisms of thermoregulation in hum…
A theory of the homogenization of a certain class of metamaterials is stated. These metamaterials are volume lattices of electric and magnetic dipoles that are resonant with frequencies that are considerably lower than that of the first Bragg resonance of the lattice. It was shown that, for plates of a metamaterial, w…
Clays and clay minerals are common components in soils, sediments, and sedimentary rocks, and they play an important role in many environmental processes. Iron is ubiquitous in clays and clay minerals and its oxidation state, in part, controls the physical and chemical properties of these fine-grained minerals. The st…
In this study we examined the cytotoxic effect of ZnO nanoparticles on various human cancer and normal cells. We found that the ZnO nanoparticles exerted a cytotoxic effect on the human glioma cell lines A172, U87, LNZ308, LN18, and LN229, whereas no cytotoxic effect was observed on normal human astrocytes. Similarly,…
Silver colloids show different colors due to light absorption and scattering in the visible region based on plasmon resonance. The resonance wavelength depends on particle size and shape. Here we report chemical reduction methods for preparation of silver nanoparticles exhibiting multicolor in aqueous solutions. Depen…
Mixed-valence manganese oxides (R1-χAχ)MnO3 (R=rare-earth cation, A=alkali or alkaline earth cation), with a structure similar to that of perovskite CaTiO3, exhibit a rich variety of crystallographic, electronic and magnetic phases. Historically they led to the formulation of new physical concepts such as double excha…