Materials Literature
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The dilatometric properties of polymer films near and above their glass-transition temperatures were explored using capacitive high-frequency detection in temperature ramping as well as in harmonic temperature cycling experiments. The broad applicability of capacitive scanning dilatometry is demonstrated by the invest…
This paper addresses the modeling of strains and forces generated by magnetostrictive transducers in response to applied magnetic fields. The magnetostrictive effect is modeled by considering both the rotation of magnetic moments in response to the field and the elastic vibrations in the transducer. The former is mode…
Phase-change optical disk technology in the early days dealt with three issues: cyclability, erase characteristics and sensitivity. These were resolved by materials development, and disk layer structure technologies. This paper shows the high (carrier to noise ratio) C / N recording characteristics of a multi-level ph…
In metallic manganites with low Curie temperatures, a peculiar softening of the magnon spectrum close to the magnetic zone boundary has experimentally been observed. Here we present a theory of the renormalization of the magnetic excitation spectrum in colossal magnetoresistance compounds. The theory is based on the m…
A correlation between the magnetic properties and the crystal structure of the nitronyl nitroxide (NN) radical 2-(6-ethynyl-2-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (6-HC⋮CPyNN, 1 ) and its imino nitroxide analogue 2-(6-ethynyl-2-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl (6-HC⋮CPyIN, 2 ) has been…
An inexpensive and reusable thermoplastic material that is promising in the field of chemical separations, and in particular of water and air purification from volatile organic compounds, is presented. This semicrystalline material based on syndiotactic polystyrene comprises a nanoporous crystalline phase where guest…
In order to facilitate the three-dimensional structure comparison of proteins, software for making comparisons and searching for similarities to protein structures in databases has been developed. The program identifies the residues that share similar positions of both main-chain and side-chain atoms between two prote…
A photocrosslinkable chitosan to which both azide and lactose moieties were introduced (Az-CH-LA) was prepared as a biological adhesive for soft tissues and its effectiveness was compared with that of fibrin glue. Introduction of the lactose moieties resulted in a much more water-soluble chitosan at neutral pH. Applic…
Diffusion of erucamide (13-cis-docosenamide) [H3C— (—CH2—)11—HC=CH—(—CH2—)7—CO— NH2] (eru) in poly(laurolactam) (Nylon 12) (PA-12) has been studied in a temperature range from 343 to 353 K. In previous investigations on the diffusion of eru in isotactic poly(propylene) (i-PP) it was found that the diffusion took place…
Ceramics belonging to the Pb5xK6(1−x)Li4(1−x)Ta10O30 solid solution were prepared and characterized by dielectric and a. c. impedance complex measurements. Two types of relaxations were observed: a relaxor behavior and an impedance relaxation. Characteristics of these two relaxations were studied and explained for a p…
The successful matrix stimulation of carbonate reservoirs requires that live acid penetrate past the formation damage. Effective acid penetration is facilitated either by transport through natural fractures or the formation of dissolution channels (wormholes) during the acidizing process. The optimal formation of worm…
A low percentage of cyclic oligomers can be found in poly(ethylene terephthalate) (PET) from its synthesis onward. In this article, a cyclic-oligomer-free PET (COFP) obtained by solvent extraction was used to study the thermodynamics of the re-formation of cyclics from the melt. The cyclic-oligomer content re-increase…
Abstract Illitization of smectite during progressive burial diagenesis occurs differently in sandstone and mudstone, which are interbedded in the sedimentary sequence of the Niigata basin. Reaction progress of illitization of smectite via mixed-layer illite-smectite (I-S) in the mudstone is more complete than in the s…
The number of protein structures refined at a resolution higher than 1.0 A is continuously increasing. Subatomic structures may deserve a more sophisticated model than the spherical atomic electron density. In very high resolution structural studies (d < 0.5 A) of small peptides, a multipolar atom model is used to des…
Porphyrins, usually as metal complexes of either iron or magnesium, are widely distributed in nature, and exist as the prosthetic groups in a wide variety of primary metabolites such as hemoglobins, myoglobins, cytochromes, catalases, peroxidases, chlorophylls, and bacteriochlorophylls. This article describes the curr…
Synthesis of InGaZnO4 at 20Kb and 50Kb produced a single crystal and a twinned crystal respectively. The X�ray diffraction crystal structure refinement (R1 = 0.015 and 0.019 respectively) and the Charge Distribution analysis are reported. Space group is R3m; cell parameters in hexagonal axes are a = 3.2990(2)Å, c = 26…
A tensile version of the split Hopkinson bar, suitable for dynamic testing of laminated composite materials, is introduced. A pulse duration of 200-250 microseconds and peak strain rates of up to 350 s5l are obtained. Tests performed on a quasi-isotropic lay-up of graphite-epoxy show good repeatability. To determine t…
Twisted yarns are normally used for increasing the lateral cohesion of filaments and also for ease of handling. By twisting yarns, the microdamage can be localized, leading to possible increase in the failure strength of the yarns. In this paper, an analytical method is presented for predicting the elastic properties…
We report on how to achieve and measure director tilt angle distributions θ( z ) in cross-linked nematic liquid crystal polymer (LCP) films by means of generalized anisotropic ellipsometry. LCP-alignment is made by linearly photopolymerized (LPP)-photo-alignment of LCP films on single substrates. For the first time ar…
Due to the existence of a macroscopic helicoidal structure, cholesteric liquid crystals exhibit many remarkable properties like selective light reflections. Bragg reflections occur when the helix pitch is of the order of the wavelength of the incident light propagating along the helix axis. The wavelength bandwidth is…