Materials Literature
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Rhombohedral Cr 2 Se 3 is an antiferromagnetic compound with antiferromagnetic AF(L) phase below 38 K (= T t ) and the antiferromagnetic AF(H) one between 38 K and 45 K (= T N ). Neutron diffraction studies for rhombohedral Cr 2 Se 3 are carried out at temperatures from 6 K to 77 K. The results show that the magnetic…
The transverse thermal conductivities of SiO2 thin films are determined as a function of film thickness. The results indicate that the apparent thermal conductivities of SiO2 thin films are much lower than the thermal conductivity of bulk SiO2. In addition, a slight decrease in the thermal conductivity is observed as…
Abstract The anisotropy of the thermal expansion of polyimide films was investigated . Out‐of‐plane or thickness direction coefficients of linear thermal expansion (CTE) were calculated from the difference between the coefficient of volumetric expansion (CVE) and the sum of the in‐plane or film direction coefficients…
A systematic study of Sn-doped lead zirconate titanate ceramics has been carried out as a function of Sn and Ti contents. Dielectric constant and remanent polarization measurements have been performed and compared to our recent transmission electron microscopy study. The dielectric maximum was found to be associated w…
We report on the optical band gap of the filled tetrahedral semiconductor LiZnAs [viewed as a hypothetical zinc-blende (ZnAs${)}^{\mathrm{\ensuremath{-}}}$ lattice partially filled with He-like ${\mathrm{Li}}^{+}$ interstitials]. The band-structure nature of LiZnAs is found to be direct with a forbidden gap of 1.51 eV…
Heavily doped polypyrrole-hexafluorophosphate, PPy(${\mathrm{PF}}_{6}$), undergoes a metal-insulator (M-I) transition at resistivity ratio ${\mathrm{\ensuremath{\rho}}}_{\mathit{r}}$=\ensuremath{\rho}(1.4 K)/${\mathrm{\ensuremath{\rho}}}_{\mathit{r}}$(300 K)\ensuremath{\approxeq}10: for ${\mathrm{\ensuremath{\rho}}}_{…
We have shown that sterically stabilized (Stealth) liposomes (SL), can accumulate in the extracellular space within tumors, and may improve pharmacokinetics and therapeutic efficacy of encapsulated doxorubicin (SL-DOX). When SL-DOX were incubated in vitro at different temperatures with 50% bovine serum, approximately…
We measured the D - E hysteresis loop of TGS (triglycine sulphate), and transformed it to the q - E hysteresis loop by a method proposed in this paper, where q is the volume fraction of reversed domains. The experimental result was compared with a theory based on the Avrami model by the present authors [H. Orihara, S.…
Abstract Structural changes of native and regenerated silk fibroin membranes were induced by immersion in water‐methanol solutions and examined as a function of immersion time and methanol concentration. X‐ray diffractometry and infrared spectroscopy data showed that transition from random coil to β‐sheet structure oc…
A process based on the Kratschmer-Huffman carbon arc method of preparing fullerenes has been used to generate carbon-coated cobalt and cobalt carbide nanocrystallites. Magnetic nanocrystallites are extracted from the soot with a gradient field technique. For Co/C composites, structural characterization by x-ray diffra…
The chemical composition of thin native oxide layers grown on GaAs and InAs by ultraviolet (UV)/ozone and thermal oxidation is investigated using x-ray-photoelectron spectroscopy. Core-level binding energies, core-level intensities, and valence-band spectra are compared with data for bulk crystalline binary or ternary…
Alcaligenes eutrophus NCIMB 11599 was cultivated to produce poly(3-hydroxybutyric acid) (PHB) from glucose by the automatic fed-batch culture technique. The glucose concentration of the culture broth was controlled at 10 to 20 g/L by two methods: using exit gas data obtained from a mass spectrometer and using an on-li…
Magnetic properties of La 1- x Sr x CoO 3 (0 ≤ x ≤0.5) have been studied by magnetization measurements in low magnetic fields. It has been found that there exist spin-glass (0< x ≤0.18) and cluster-glass (0.18 ≤ x ≤0.5) regions. Ferromagnetic long-range order previously reported does not take place. Spin-glass behavio…
Transition between the low- and high-density amorphous H2O was observed with a piston-cylinder apparatus from 77 K to 140 K, almost the glass-transition temperature of the amorphs. The transition was found to occur reversibly and abruptly at ∼135 K and ∼0.2 GPa with a volume change of 0.20±∼0.01 cm3/g and some hystere…
Abstract The effect of temperature on the crystallization of α, β, and γ phases of PVDF from dimethylacetamide (DMA) solution was studied. Variation in the crystallinity content of these three phases was obtained as a function of temperature using infrared spectroscopy, differential scanning calorimetry (DSC) and x‐ra…
A negative isotropic magnetoresistance effect more than three orders of magnitude larger than the typical giant magnetoresistance of some superlattice films has been observed in thin oxide films of perovskite-like La(0.67)Ca(0.33)MnOx. Epitaxial films that are grown on LaAIO(3) substrates by laser ablation and suitabl…
Lactobacillus brevis takes up lactose and the nonmetabolizable lactose analogue thiomethyl beta-galactoside (TMG) by a permease-catalyzed lactose/H+ symport mechanism. Earlier studies have shown that TMG, previously accumulated in L. brevis cells, rapidly effluxes from the cells upon addition of glucose, and that gluc…
We study the effects of relativity on the stability of group II elements Zn, Cd, and Hg in face centered cubic (fcc) and hexagonal close-packed (hcp) structures. A comparison of nonrelativistic and scalar-relativistic results for both the fcc and the hcp phases of these elements, obtained self consistently, clearly sh…
Observation of mode selection in an optical fiber with nematic liquid-crystal cladding is reported. The TE01 mode is guided, while the TM01 mode leaks out. This behavior is achieved by radially oriented liquid-crystal directors in the cladding of an optical fiber with isotropic core. A theory which quantitatively acco…
Abstract The interdiffusion of two miscible polymers, polycarbonate (PC) and a copolyester (KODAR), was studied at temperatures from 200 to 230°C. The two polymers were coextruded as microlayer composites with up to 3713 alternating layers. The microlayer structure provided a large area of intimate contact between the…