Materials Literature
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The synthesis of aligned, monodispersed boron carbide nanofibers has been achieved by the 1025 °C pyrolysis of the compound 6,6‘-(CH2)6(B10H13)2 absorbed into a porous alumina matrix, followed by dissolution of the alumina with aqueous HF. SEM studies show that the nanofibers are ∼45 μm in length with diameters of ∼25…
Two different types of BaTiO 3 seed particles, normal and twinned seeds of ∼30 μm on the average, were prepared from crushed sintered specimens. Normal seeds were obtained from the usual BaTiO 3 sintered compacts, while twinned seeds containing a double twin were obtained from BaTiO 3 compacts sintered with 2 mol% of…
Aromatic amino acid aminotransferase (ArATPh), which has a melting temperature of 120 degrees C, is one of the most thermostable aminotransferases yet to be discovered. The crystal structure of this aminotransferase from the hyperthermophilic archaeon Pyrococcus horikoshii was determined to a resolution of 2.1 A. ArAT…
It is shown that lattice disorder induced by Nb and Ca substitution has a strong influence on the dielectric and relaxational properties of ${\mathrm{KTaO}}_{3}.$ Both substituents are believed to occupy off-center positions at the Ta site, and the difference in valence between the ${\mathrm{Ca}}^{2+}$ and ${\mathrm{T…
Electronic and magnetic properties of the perovskitelike compounds of ${R}_{0.5}{A}_{0.5}{\mathrm{MnO}}_{3}(R=\mathrm{Gd},$ Dy, Ho, Er; $A=\mathrm{Sr},$ Ca) have been studied by measuring lattice parameter, electrical resistivity, magnetic susceptibility, and magnetization. All the Sr-doped compounds show a transition…
Ultrafine (<0.1 μm) high‐purity θ‐Al 2 O 3 powder containing 3–17.5 mol%α‐Al 2 O 3 seeds was used to investigate the kinetics and microstructural evolution of the θ‐Al 2 O 3 to α‐Al 2 O 3 transformation. The transformation and densification of the powder that occurred in sequence from 960° to 1100°C were characteri…
MOTIVATION: Crystallographers were motivated 10 years ago to develop a simple and consistent data representation for the exchange and archiving of data associated with the crystallographic experiment and the final structure. As this process evolved (and the data grew at near exponential rates) came the recognition tha…
Den vermeintlichen Nachteil nutzen: Die eher enttäuschende Reaktivität der Metall-Stickstoff-Bindung im Vergleich zur Metall-Kohlenstoff-Bindung ließ die Amidometallchemie nach ihrer Blüte Ende der sechziger, Anfang der siebziger Jahre etwas in Vergessenheit geraten. Heute nutzt man genau diesen Nachteil, um durch Ami…
Temperature dependence of heat capacities of organic superconductors, $\ensuremath{\kappa}\ensuremath{-}{(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\ensuremath{-}\mathrm{T}\mathrm{T}\mathrm{F})}_{2}{\mathrm{Cu}[\mathrm{N}(\mathrm{CN})}_{2}]X (X=\mathrm{Br}$ and Cl), was measured by chopped-light ac calorimetry between 1…
Fluorescence recovery after photobleaching was used to measure in-plane dye-probe diffusion coefficients, D, in thin films of monodisperse polystyrene supported on fused quartz substrates. The substrates were prepared with a high density of surface hydroxyl groups which interact favorably with repeat units of the poly…
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…