Sonoluminescence is a phenomenon involving the transduction of sound into light. The detailed mechanism as well as the energy-focusing potentials are not yet fully explored and understood. So far only optical photons are observed, while emissions in the ultra-violet range are only inferred. By doping the fluorescent dye quinine into water with dilute sulphuric acid, the high energy photons can ...

A solution of the compound in 5% methanolic potassium hydroxide remained colorless. Acknowledgment.-The authors are indebted to Mr. J. F. Alicino and his assistants for the microanalyses, and to Dr. Nettie Coy for the ultra-violet absorption data. Summary.-Diacetyl-7-ketojervine has been prepared by chromic acid oxidation of diacetyljervine. The ultra-violet absorption characteristics of this c...

The impact of ultra violet radiations on alpha amylase producing ability of Bacillus subtilis (2620) was studied. Maximum enzymatic activity (crude) upto 17 folds were obtained from mutant strain exposed to 60 minutes ultra violet irradiation in comparison to parent strain. Purified enzyme showed molecular weight of 68 KDa and 54 KDa by SDS-PAGE in both parent and mutant strains. The SDS-PAGE o...

Deep ultra-violet semiconductor lasers have numerous applications for optical storage and biochemistry. Many strategies based on nitride heterostructures and adapted substrates have been investigated to develop efficient active layers in this spectral range, starting with AlGaN quantum wells on AlN substrates and more recently sapphire and SiC substrates. Here we report an efficient and simple ...

Copper nanowires have the potential to reach and even exceed the indium tin oxide performances as flexible transparent conductive electrodes. However, for a large-scale production, they need to be fabricated in a high-speed, low-cost way, without degrading the flexible substrate. One of the major bottlenecks resides in the post-treatment used to remove organic residues from the surface of the n...

A metric is introduced on the space of parameters (couplings) describing the large N limit of the O(N) model in Euclidean space. The geometry associated with this metric is analysed in the particular case of the infinite volume limit in 3 dimensions and it is shown that the Ricci curvature diverges at the infra-red (Gaussian) fixed point but is finite and tends to constant negative curvature at...

(1) Pettit, E. “Ultra-violet Solar Radiation.” Mount Wilson Contr., N ~ . 98. prp,.. Nat. Acad. sc., 13, 380-387, 1927. (2) Pettit, h. Measurements of Ultra-Violet Solar Radiation.” Mount Wilson Contr., No. 445; Astrophysical Jour., 75, 185-221, 1932. (3) .Davis, G. E. “Instruments for Radiometric and Radiobiological Investigations a t the Desert Sanatorium and Institute of Research, Tucson, Ar...

In this pepper Fe2O3 nanoparticles were synthesized via a fast microwave method. Then Fe2O3-TiO2 nanocomposites were synthesized by a sonochemical-assisted method. The prepared products were characterized by X-ray diffraction pattern, scanning electron microscopy and Fourier transform infrared spectroscopy. The photocatalytic behaviour of Fe2O3-TiO2 nanocomposites was evaluated using the degrad...