Materials Literature
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Microporous silica was prepared by selective leaching of the Al 2 O 3 component from calcined kaolinite. The kaolinite was calcined at various temperatures from 400 to 1000°C for 24 h. It was then chemically treated with a 20 mass% H 2 SO 4 solution at 90°C for 2h and the effect of the calcining temperature was studie…
Abstract Crystalline magnesia (periclase) is traditionally considered an undesirable compound in cements since it hydrates slowly at normal temperatures and, hence, causes a delayed expansion. This delayed expansion may be more harmful to the concrete structure than the “early” expansion due to free lime hydration in…
Unusual piezoresponse signals have been observed in glycine aminoacid powder at a frequency near 10 MHz, which exhibited a regular pattern in time determined by a periodic phase variation in the elastic vibrations of individual powder particles. This phenomenon results from the formation of spatial structures in glyci…
This review deals with our recent development of Fe-based bulk amorphous alloys with soft magnetic properties. Multicomponent Fe-(Al,Ga )-(P,C,B,Si) and Fe-(Co,Ni)-(Zr,Nb,Ta)-B alloys are amorphized in the bulk form with diameters up to 2 and 6 mm, respectively, by copper mold casting and the largest temperature inter…
High electric fields are known to irreversibly reduce the out-of-plane tilt of the chevron layers in ferroelectric liquid crystal (FLC) devices. This paper reports a dynamic x-ray study of field driven structural layer changes in a ∼4μm thick FLC device containing the liquid crystal SCE13. The applied voltage and dura…
Combined therapy with heat-sensitive liposomes as carriers for drugs and local hyperthermia is thought to improve the local control rate. I studied the antitumor effects and concentrations of CDDP encapsulated in heat-sensitive liposomes (LIP-CDDP) in vivo. LIP-CDDP or CDDP-solution was given to 8 week-old male C3H/He…
This paper concerns morphological stability of a similarity solution to the Stefan problem with surface tension and initial supercooling. The linear stability analysis shows that for a nonzero surface tension each perturbation mode with a nonzero wave number is stable. However, the solution is unstable with respect to…
We describe the preparation and some optical properties of high refractive index TeO2-PbO-TiO2 glass system. Highly homogeneous glasses were obtained by agitating the mixture during the melting process in an alumina crucible. The characterization was done by X-ray diffraction, Raman scattering, light absorption and li…
The magnetocrystalline anisotropy energy (MAE) of (Fe1−xCox)3P (x=0, 0.1, 0.2, 0.33) has been studied in the temperature range 5 K–300 K. The compound crystallizes in a tetragonal structure with three non-equivalent metal sites and shows an easy planar behavior with the magnetic moments aligned in the ab plane and the…
Twenty seven samples of carboxylato- and sulfonato-telechelic polyisoprenes associated with various cations (Na, K, Rb, Cs, Mg, Ca, Sr, and Ba) have been investigated by small-angle X-ray scattering. The Bragg spacing characteristic of the ionic peak is directly proportional to the root-mean-square end-to-end distance…
An experimental investigation has been carried out to determine the extent to which axial divergence in a conventional powder diffractometer influences the measurement of peak profile parameters. A Siemens D5000 θ–2θ diffractometer was used for this study along with the LaB 6 line profile standard SRM 660. Eight uniqu…
Abstract— Polymer‐stabilized cholesteric‐texture light shutters are made of cholesteric liquid crystal and polymer‐network dispersions. In the polymer‐stabilized cholesteric‐texture reverse‐mode light shutter, the dispersed polymer network stabilizes the transparent planar texture of the liquid crystal at zero field.…
Carbon nanotubes have a whisker-like structure so an extremely high strength and lack of plasticity are generally predicted. In-situ observations made by transmission electron microscopy, however, prove that carbon nanotubes bend plastically at room temperature. The bending process at the atomic level is suggested by…
Glasses with low silica content are very susceptible to suffer pronounced degradation when exposed to room atmosphere during short times. In this work the results of the degradation of the surface of a metasilicate glass with composition 2Na2O.1CaO.3SiO2 are presented. Optical and scanning electron microscopy observat…
The effect of nitrogen in the range of 80 to 240 ppm on the microstructure and properties of C-Mn shielded metal arc welds containing Ti and B has been studied. It was found that nitrogen interacted with both elements and, by a combination of solute and microstructural changes, affected mechanical properties in either…
The predicted active site of chorismate mutase of baker's yeast Saccharomyces cerevisiae has been studied by continuum electrostatics, molecular surface/volume calculations, and molecular modeling. Our study shows that despite being subject to an allosteric transition, the enzyme's active-site pocket neither decreased…
A commercially available, sintered silicon carbide was exposed to a temperature of 982°C for up to 50 h in a burner rig pressurized to 500 kPa. Synthetic sea salt added to the flame (5 ppm) resulted in the deposition of sodium sulfate and formation of a sodium magnesium silicate corrosion product. A 16% reduction in r…
For TGS crystals pure and admixtured with L-threonine, measurements of the permittivity ε and tg δ of the loss angle versus the measuring field frequency (varied from 1 to 104 kHz) were performed in the temperature range from 80 to 330 K. For the first time the low-frequency dielectric dispersion was observed in three…
The distribution of valence among the bonds in the bond graph of an inorganic compound is used to calculate an `entropy'. We show that the distribution of valence that maximizes this entropy (ME) is similar, but not identical, to that obtained using the equal-valence rule (EVR) proposed by Brown [ Acta Cryst . (1977),…
The magnetization and resistivity of single crystals of the ferromagnetic compound Sr14MnSb11 are measured as functions of magnetic field, temperature, and crystal orientation. The uniform magnetic susceptibility is used to identify TC=39 K. The ferromagnetic state is found to have a hard axis (c axis) anisotropy. The…