Materials Literature
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Single crystals of CaFeO3 have been synthesized at high pressure of 4.5 GPa with a mixture of KClO4, NaCI and CaCl2 as flux and oxidizing agent. The temperature dependence of the resistivity showed a metal-insurating transition at 295 K, corresponding to the charege disproprotionation. A screw-spin type antiferromagne…
A sewing machine consists of four basic mechanisms: a take-up mechanism, a needle-motion mechanism, a material-feeding mechanism, and a bobbin. Its proper operation requires a delicate balance of these mechanisms. This paper introduces a computer-simulation model that represents these mechanisms and uses the model to…
The films colored by a three-step electrolytic coloring method were examined with respect to influence of ultraviolet irradiation using transmission electron microscopy (TEM) and color difference measurement, and the results were compared with those of films colored by a two-step electrolytic coloring method. The thre…
Sol-gel deposited lead zirconate titanate piezoelectric thin films were reactive ion etched in SF6 plasmas. Etch rates increased approximately linearly with cathode power, reaching 65 nm/min at 300 W, Etch rate was independent of SF6 flow rate but increased as pressure was reduced, indicating an etch process that is d…
Partial discharge (PD) is an important cause of insulation degradation in transformers and electrical machines. This paper introduces a kind of fractal image compression (FIC) method used in PD pattern recognition. With classification to domain blocks and quadtree partition to image, the method can compress PD gray in…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation M. Capone, D. Feinberg, M. Grilli; Crucial role of Jahn–Teller distortions in LaMnO3. AIP Conf. P…
The mechanical properties and deformation behavior of Ti-5Al-2.5ZrELI alloy compared with Ti-5Al-2.5SnELI at 4.2 K, 20 K and 293 K were investigated. The results show that the new titanium alloy Ti-5Al-2.5ZrELI has more consistent properties because of its uniform microstructure and less segregation. It has good elo…
The water-soluble poly(aminoaryloxy-methylamino phosphazene) has been synthesized and investigated as a polymeric carrier species for the covalent attachment of biologically active agents. The cyclic trimeric model systems were utilized for the synthesis of polymeric analogues containing bioactive side groups. The sod…
To date, a fundamental knowledge of flow and compaction mechanisms has been gained by the study of laminates with simple geometries. Since most of the applications of composites involve complex shapes, it is necessary to study their compaction behaviour to develop more accurate theories. In this paper, the flow and co…
We have investigated photoconducting properties of mat samples of single-walled carbon nanotubes (SWNTs) in order to clarify the mechanism of photoconductivity. Two peaks are observed in photoconductivity spectra around 0.7 and 1.2 eV for both samples of SWNTs synthesized by arc discharge and laser ablation methods, w…
It has been reported that the characteristic of rolling contact wear of rail steels varies depending on the microstructure and carbon content of steels. However, the reasons for such variations have not been fully elucidated yet. Accordingly, the authors conducted two-cylinder rolling contact wear test by using pearli…
The martensitic phase transformation temperature,Tm and the Curie temperature, TC, of polycrystalline samples Ni2+xMn1-x Ga(x=-0.1,0,0.08,0.13,0.18,0.2) and Ni2-xMn1+x/2Ga1+x/2(x=-0.1,0,0.04,0.06,0.1) have been investigated by measuring the temperature dependence of alternating-current susceptibility. It was found tha…
Superplastic deformation behavior of microduplex Pb-Sn alloys has been investigated in this study. The effects of test temperature and microstructure were examined within the framework of the internal variable theory of structural superplasticity. A series of load relaxation and tensile tests were conducted at room te…
Impact tensile properties of three different extruded magnesium alloys (AZ31B–F, AZ61A–F and ZK60A–T5) are determined using the split Hopkinson bar. Tensile stress-strain data up to fracture in the extrusion direction at strain rates of nearly 1000/s are presented and compared with those at quasi-static and medium str…
The volatility of bismuth (Bi) presents difficulty in the integration of ferroelectric strontium bismuth tantalate (SrBi2Ta2O9 or SBT) thin films for FeRAM applications. This paper presents preliminary results indicating that the Bi volatility problem may be controlled by the addition of vanadium (V) to SBT. A series…
Fluorescent poly(benzyl ether) dendrimers containing an isobutenyl and two naphthoate units at the core have been synthesized; thermal reaction (tandem Claisen rearrangement) of the dendrimers took place quantitatively, resulting in the complete quenching of the fluorescence.
Electrostrictive strain x, DC-biased dielectric constant b K 33, DC bias field-induced electromechanical planar coupling factor bkp and piezoelectric strain coefficient bd31 of La, Bi, Sr and Nb modified PBZT and Ba-A-side doped PLZT compositions were investigated and discussed in this paper. Some of the compositions…
The effect of Ni content on weld hot cracking susceptibility of Fe-20%Cr-Ni alloys, which solidify as austenitic single phase, was investigated. In addition, the effect and effect mechanism of alloying elements on weld hot cracking susceptibility of such alloys was studied in the varied ranges of Ni constitution. A th…
A renewable polymer, collected as a gum from a local plant (Moringa Oleifera) was characterized by various techniques viz. solubility, viscosity, IR, elemental analysis etc. it was compounded with various elastomeric systems viz. natural rubber (NR), nitrile rubber (NBR) and chloroprene rubber (CR) in order to judge i…
Recently, titanium-tantalum alloys have been studied as implant materials for dental and orthopedic surgery. However, titanium and tantalum are difficult to mix by common arc melting and induction melting, because of their high melting point and the marked difference between their densities (Ti: 1,680 degrees C, 4.5 g…