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Abstract Dielectric studies in epoxy and epoxy composites, containing different volume fractions of three different dielectric fillers, have been performed using the impedance bridge method for the high frequency region, 10 2 to 10 5 Hz, and the d.c. transient current method for the low frequency region, 10 −4 to 10 −…
Adenylate kinase has been isolated from four related methanogenic members of the Archaea. For each, the optimum temperature for enzyme activity was similar to the temperature for optimal microbial growth and was approximately 30 degrees C for Methanococcus voltae, 70 degrees C for Methanococcus thermolithotrophicus, 8…
Isothermal charging, discharging and transport currents in fluoropolymer films are measured in the temperature range of 50 to 200/spl deg/C at electric fields to 40 MV/m. The currents are measured as a function of time elapsed after the application of steady state voltages in the range of 1 to 10/sup 4/ s. Charging cu…
Structural phase transitions in hydrogen-bonded (H-bonded) ferroelectrics and related materials are reviewed from the geometrical viewpoint of H-bond system. It is pointed out that the isotope effect in the transition temperature Tc has a correlation with the symmetry of H-bond and its geometric isotope effect. It is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallinity Dependence of Lewis Acidity and Lewis Basicity in Na ZeolitesAline Auroux, Minming Huang, and Serge KaliaguineCite this: J. Phys. Chem. 1995, 99, 24, 9952–9959Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published inissue 1…
We have measured the second virial coefficient ${\mathit{B}}_{2}$ of very dilute colloidal dispersions of charge-stabilized polystyrene latex spheres in the one-phase region of the mixed solvent 2,6-lutidine plus water. These measurements were made as a function of temperature for two solvent compositions, both of whi…
Dynamic charging is the condition in which the magnitude of the charge on the surface of a non-conductor, such as a polymer, under electron irradiation appears to change with the incident current density. Measurements confirm that this effect does occur and show that the magnitude of the effect depends on the relation…
Inhibition of aluminum corrosion in 0.5 M hydrochloric acid (HCl) solution by 5-benzylidine-1-methyl-2-methylthio-imidazole-4-one was tested using weight loss and polarization resistance measurements. Results of tests for weight loss, polarization resistance, and volume of hydrogen evolution (VHE) indicated inhibitor…
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Abstract Photochromic fulgides with a bulky 1-alkyl-1-indolylmethylidene and/or a bulky alkylidene substituent were synthesized and their photochromic as well as absorption spectroscopic properties were compared with those of the known prototype indolylfulgide, 3-[1-(1,2-dimethyl-3-indolyl)ethylidene]-4-isopropylidene…
Abstract The catalytic decomposition of dinitrogen oxide to nitrogen and oxygen was studied over various rhodium-loaded metal oxides. Rh/ZnO was found to have the highest activity. The effects of metal loading and calcination conditions upon the catalytic performance were also examined. An air-pretreated 0.5 wt% Rh/Zn…
Empirical corrections for the preferred orientation of grains in powder specimens have been generalized. Treatment of asymmetric diffraction geometries [Seemann–Bohlin (Guinier) geometry; glancing-angle geometry] is included. Inclined textures (in which the maximum of the pole density of preferentially oriented planes…
The effect of NaCl on growth and compatible solute utilization was investigated in a Halomonas species. Growth of Halomonas was observed in medium of low osmolarity (high water activity) when only 01 mM Na + was present. However, lowering the water activity, by addition of KCl or sucrose, inhibited growth in this low-…
Two methods for the experimental determination of single-phase induction motor parameters are studied. The one is a relatively complicated method based on single-phase measurements. The other utilizes a two-phase based strategy. An investigation was done to evaluate the accuracy with which the performance of a machine…
By eliminating the admixture of glass components to the original powder when making the paste, screen‐printed structures can be produced from strontium titanate with reproducible properties. The ways that the film structure and the temperature profile affect the dependence of the electric conductivity on the oxygen pa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNature and Strength of the .lambda.5-P:C "Double" BondLaszlo Nyulaszi, Tamas Veszpremi, and Jozsef ReffyCite this: J. Phys. Chem. 1995, 99, 25, 10142–10146Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published inissue 1 June 1995https://…
Abstract Pressure‐induced phase changes in SrMoO 4 were investigated by high‐pressure Raman spectroscopy in a diamond anvil cell. The scheelite‐type SrMoO 4 transforms in to a monoclinic lattice near 13 GPa and retains this structure up to 37 GPa, the limit of pressure tested. There is no pressure‐induced amorphizatio…
Abstract The preparation of rigid aromatic, highly branched polyamides is described. Owing to the method of preparation and the chosen ratio of difunctional to trifunctional monomers, these entities are highly porous and not dendrimeric in nature. They better conform with the fractal model and are therefore called fra…
Abstract Stress corrosion cracking (SCC) induced by chlorides frequently causes problems in applications where standard austenitic stainless steels are being used. Often this problem can be solved by the use of duplex stainless steels. In this report the mechanisms for SCC have been surveyed, and the cause for the hig…
Several new classes of mesogenic heterocyclic liquid crystals with different terminal groups are presented. Their material properties are investigated and compared with those of 2,5-disubstituted pyridine derivatives. New compounds are found to exhibit broader temperature ranges and higher transition temperatures than…