Materials Literature
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Abstract The solid‐state structure of a bacterially synthesized copolyester, poly(3‐hydroxybutyrate‐ co ‐3‐hydroxypropionate), P(3HB‐ co ‐3HP), with the 3HP content ranging from 0 to 37 mol‐%, was analyzed by 13 C solid‐state high‐resolution NMR, X‐ray diffraction, differential scanning calorimetry and optical microsc…
The transverse momentum of photoelectrons released from a negative electron affinity GaAs cathode is small compared with other thermonic or field emission electron sources. A low photoelectron transverse momentum in vacuum promises highly focused, low-energy beams useful for numerous applications. A simplified theory…
Abstract The photocleavage reaction of dimer model compounds of photosensitive polyimides having cyclobutane rings in the main chain was studied. Efficient photocleavage was observed for the dimer models (CBAM2, CBAM4, and CBPM2) which had an electron‐donating aromatic substituent at the electron‐accepting imide group…
Abstract Hydrothermal treatment of a mixture of silicic acid, cobalt chloride, sodium dithionite and sodium hydroxide at 250 °C under 500 psi of argon produced a pink solid. X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and electron diffraction data showed the product to be a well-crystallized…
The authors discuss the physical background of the electrocaloric effect in PST ceramics and its solid solutions. The most important contribution to the electrocaloric effect is due to field-induced Fm3m→R3m phase transition in the case of high long range ordering degree of B-ions in the perovskite structure ABO3.
Abstract Crystallinity and mechanical properties of blends with different amounts of semicrystalline poly(aryl/ ether ether ketone) (PEEK) and amorphous poly(ether imide) (PEI) polymers have been studied. The blends, prepared by melt mixing, have been investigated by differential scanning calorimeter (DSC) to analyze…
ABSTRACT The cells of synurophyte flagellates (algal class Synurophyceae, formerly included in the Chrysophyceae) are enclosed within a regularly imbricate layer of ornamented siliceous scales. Scale morphology is of critical taxonomic importance within this group of algae, and the scales are valuable indicator microf…
The solidification of polyethylene glycols (PEG 1500, PEG 2000, PEG 4000, PEG 6000), gelucire 44/14 or their dispersions containing triamterene or temazepam were studied to assess the feasibility of using these dispersions to liquid-fill hard gelatin capsules. Solidification from melts, investigated by differential sc…
A simplified model of textile fabric drape based on two-dimensional ring theory is applied to the circular geometry of the drapemeter. A material parameter incorporating fabric properties and drape geometry is identified and used to characterize the drape response in terms of the energy contained in a series of deform…
he conclusions reached based on a grain/interphase boundary sliding controlled flow model for optimal structural superplasticity are verified using experimental data from three aluminium alloy systems. Isostructural strain rate–stress relationships could be calculated very accurately using five experimentally determin…
Abstract TG‐DSC studies, carried out on hydroxy‐terminated polybutadiene (HTPB) in air and nitrogen atmospheres show three transitions which give rise to (1) an exothermic DSC peak and mass gain in TG at 170°C–240°C, seen only in air (2) exothermic peak and low mass loss, both in air and nitrogen, due to depolymerizat…
The 6G, -^ 6 emission for Gd3+ in LiYF4 around 600 nm is reported. As far as we are aware, this is tle first observation of visible luminescence from trivalent gadolinium.
Ferroelectric Langmuir-Blodgett films are prepared and investigated for the first time. The films are prepared from the ferroelectric copolymer of vinylidene fluoride with trifluorethylene. Films with a thickness of 150Å show a pyroelectric effect, remnant polarization switching and a ferroelectric phase transition of…
Technical Briefs Effect of Uniaxial, Cyclic Stretch on the Morphology of Monocytes/Macrophages in Culture Takeo Matsumoto, Takeo Matsumoto Biomechanics Laboratory, Department of Mechatronics and Precision Engineering, Tohoku University, Sendai, Japan Search for other works by this author on: This Site PubMed Google Sc…
New near IR to near UV upconversion (UC) materials are required for the development of solid state lasers pumped by laser diodes. Two materials are reported: an air‐stable and efficient UC material emitting mostly in the yellowish‐green and a very promising UC compound, Ba 2 ErCl 7 , which is being further characteriz…
We present the results of subwavelength antireflection surfaces etched into GaAs for use at 975 nm. These surfaces comprise linear gratings with periods less than the wavelength of light in GaAs. The structure appears as a homogeneous birefringent film. For one of the two polarizations, the film is directly analogous…
Measurements of x-ray diffraction, magnetization, magnetostriction, and M\"ossbauer effect were made on a series of ${\mathrm{Sm}}_{0.88}$${\mathrm{Dy}}_{0.12}$(${\mathrm{Fe}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Co}}_{\mathit{x}}$${)}_{2}$ polycrystalline samples (x=0.0, 0.2, 0.4, 0.6, 0.8, 1.0). It was fou…
Abstract Structures and elastic properties (Young's moduli) of the different phases of cellulose I and II are studied on the basis of molecular dynamics (MD) simulations using a new force field for carbohydrates. The structural results for all phases as well as the Young's moduli for cellulose I and cellulose II with…
Shot peen forming is a production process used to create curved metal parts from sheet. It is commercially important despite the fact that its mechanisms are not fully understood; peen forming programmes are currently generated using experience and trial and error. The purpose of this work is to increase the predictab…
The cross-relaxation probability (${\mathrm{sec}}^{\mathrm{\ensuremath{-}}1}$) involving the $^{5}$${\mathit{S}}_{2}$ and $^{5}$${\mathit{I}}_{8}$ levels of holmium ions in ${\mathrm{LiYF}}_{4}$ was investigated and its concentration dependence determined. By using a random distribution function of ions in the crystal…