Characteristics of an electrical discharge with full ionization of seed

The characteristics of an electrical discharge in potassium seeded argon were investigated experimentally. Experiments were carried out using a cylindrical glass tube filled with low pressure potassium seeded argon. A current was applied from a.d.c. power supply. Discharge characteristics, such as electrical conductivity, electron temperature, diameter and radial distribution of the line spectrum were measured for various discharge currents. The measured electrical conductivity has shown good agreement with calculated results obtained on the basis of the two-temperature model, including radiation loss. The measured electron temperatures also agreed with the results of calculations for high current densities. It is found that the discharge fills the entire cross section of the tube when the seed is fully ionized, and at the same time, the discharge becomes quite uniform, except near the tube wall, even for high current densities.     

Ir-based refractory superalloys by pulse electric current sintering (PECS) process (II prealloyed powder)

Five prealloyed powder samples prepared from binary Ir-based refractory superalloys were sintered at 1800 °C for 4 h by Pulse Electric Current Sintering (PECS). No metal loss was observed during sintering. The relative densities of the sintered specimens all exceeded 90% T.D. The best one was Ir-13% Hf with the density of 97.82% T.D. Phases detected in sintered samples were in accordance with the phase diagram as expected. Fractured surfaces were observed in two samples (Ir-13% Hf and Ir-15% Zr). Some improvements obtained by using prealloyed powders instead of elemental powders, which were investigated in the previous studies, were presented.     

New extremal self-dual codes of length 62 and related extremalself-dual codes

New extremal self-dual codes of length 62 are constructed with weight enumerators of three different types. Two of these types were not represented by any known code up till now. All these codes possess an automorphism of order 15. Some of them are used to construct extremal self-dual codes of length 60 by the method of subtracting. By additional subtracting, an extremal self-dual [58, 29, 10] code was obtained having a weight enumerator which does not correspond to any code known so far     

The use of direct instructions to modify hypnotic performance: The effects of programmed learning procedures.

Examined the extent to which hypnotic performance could be modified by means of written instructions designed to maximize S attention to hypnotic facilitative information. Ss were 48 hypnotically naive college students with low or moderate scores on the Harvard Group Scale of Hypnotic Susceptibility. Information (termed "active") which had been previously demonstrated effective in increasing responsiveness to hypnosis was administered to Ss either according to a programed learning format (programed active information group) or in a more traditionally read manner (active information group). An additional group read historical information concerning hypnosis (termed "passive" information), while a 4th group (no-treatment control) was not exposed to any information concerning hypnosis. All Ss were given a tape recorded, modified version of the Stanford Hypnotic Susceptibility Scale following treatment, and behavioral as well as subjective self-report scores were obtained. As predicted, the programed active treatment was most effective in facilitating responsiveness. However, the active and passive treatments were not significantly different from each other. The role played by such mediating mechanisms as attention and motivational information is discussed. The limitations of this paradigm, along with the methodological and conceptual implications for more enduring modifications of hypnotic susceptibility, are considered. (18 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Studies on juvenimicin, a new antibiotic. II. Isolation, chemical characterization and structures

A series of new macrolide antibiotics was isolated from the culture filtrate of Micromonospora chalcea var, izumensis. The fat-soluble basic complex consisted of eight components which were named juvenimicin A1 approximately A4 and B1 approximately B4. Juvenimicin A3 was found to be identical with rosamicin and the structures of four of the other components (JVM A2, A4, B1 and B3) have been elucidated. Juvenimicin A2 has a methyl group at position 6 instead of the formylmethyl group of juvenimicin A3. Juvenimicin A4, B1 and B3 possess a hydroxyethyl group at position 6. Juvenimicin A4 and B1 differ from each other in the nature of the chromophore. Juvenimicin B3 differs from juvenimicin B1 in that a hydroxymethyl group is present at position 14 in the former.