Southern California partyboat sampling study Quarterly Report no. 8

Between April 1 and June 30, 1977, 125 trips were sampled aboard southern California partyboats by Department personnel. A total of 14,842 fishes belonging to 72 species was identified and measured. Otoliths were removed from 134 rockfish carcasses representing 20 species for age deterination studies. The 10 most common species sampled during the quarter accounted for 76.9% of the catch. Individually, the most common were Pacific mackerel, Scomber japonicus (16.9%); kelp bass, Paralabrax clathratus (14.5%); bocaccio, Sebastes paucispinis (11.4%); Pacific bonito, Sarda chiliensis (10.3%); barred sand bass, Paralabrax nebulifer (5.6%); olive rockfish, Sebastes serranoides (5.3%); chilipepper, S. goodei (4.0%); California barracuda, Sphyraena argentea (2.9%); and ocean whitefish, Caulolatilus princeps (2.8%). Fishing effort switched from "rockcod" to surface activity as it did during the second quarter of 1976 (26pp.

Bond Formation in Electrosorbates

The electrosorption valency y is defined and its meaning is thoroughly discussed. Exiptl. dent. of y is demonstrated for systems Au/Bi3+ and Pt/Cu2+. It is found that for homonuclear ions in aq. solns. the ratio y/z, where z stands for Nernst valency, is successfully correlated with the electro.negativity difference I XM - Xs I of the electrode metal M and the sorbate S. For small electronegativity differences, y/z •is close to unity indicating large covalency. Bond formation in electrosorbates in non-aq. solvents and at single crystal plames of various orientations are briefly discussed

Two tone response of radiofrequency signals using the voltage output of a Superconducting Quantum Interference Filter

In the presence of weak time harmonic electromagnetic fields, Superconducting Quantum Interference Filters (SQIFs) show the typical behavior of non linear mixers. The SQIFs are manufactured from high-T_c grain boundary Josephson junctions and operated in active microcooler. The dependence of dc voltage output V_dc vs. static external magnetic field B is non-periodic and consists of a well pronounced unique dip at zero field, with marginal side modulations at higher fields. We have successfully exploited the parabolic shape of the voltage dip around B=0 to mix quadratically two external time harmonic rf-signals, at frequencies f_1 and f_2 below the Josephson frequency f_J, and detect the corresponding mixing signal at f_1-f_2. When the mixing takes place on the SQIF current-voltage characteristics the component at 2f_2 - f_1 is present. The experiments suggest potential applications of a SQIF as a non-linear mixing device, capable to operate at frequencies from dc to few GHz with a large dynamic range.Comment: 10 pages, 3 Figures, submitted to J. Supercond. (as proceeding of the HTSHFF Symposium, June 2006, Cardiff

Enhancement of the ferromagnetic order of graphite after sulphuric acid treatment

We have studied the changes in the ferromagnetic behavior of graphite powder and graphite flakes after treatment with diluted sulphuric acid. We show that this kind of acid treatment enhances substantially the ferromagnetic magnetization of virgin graphite micrometer size powder as well as in graphite flakes. The anisotropic magnetoresistance (AMR) amplitude at 300 K measured in a micrometer size thin graphite flake after acid treatment reaches values comparable to polycrystalline cobalt.Comment: 3.2 pages, 4 figure

The direct evaluation of attosecond chirp from a streaking measurement

We derive an analytical expression, from classical electron trajectories in a laser field, that relates the breadth of a streaked photoelectron spectrum to the group-delay dispersion of an isolated attosecond pulse. Based on this analytical expression, we introduce a simple, efficient and robust procedure to instantly extract the attosecond pulse's chirp from the streaking measurement.Comment: 4 figure

La coleccion de Centrosema de CIAT: Datos de pasaporte basicos y distribucion geografica del germoplasma en la coleccion de CIAT

Se presentan los datos de pasaporte basicos de la coleccion de Centrosema del CIAT: no. de acceso, fuente, institucion colaboradora, origen, fecha de coleccion y registro, y mapas de la distribucion geografica de las 29 especies que conforman la coleccion. (CIAT

Catalogo de germoplasma de especies forrajeras tropicales

Se presenta un catalogo, compuesto por 3 tomos, con datos de pasaporte basicos de las accesiones de plantas forrajeras del CIAT. El tomo 1 incluye la guia secuencial y las gramineas estan ordenadas alfabeticamente por generos, mientras los tomos 2 y 3 comprenden los generos de leguminosas, de A-G y de H-Z, resp. El catalogo proporciona algunos datos como: no. de acceso, genero/especie, fuente (donacion, recoleccion colaborativa o recoleccion de CIAT), institucion colaboradora, origen, fechas de recoleccion y registro de la accesion. Se indica que algunas accesiones han pasado por una fase de multiplicacion inicial de semillas por parte del Programa de Pastos Tropicales y/o la Unidad de Recursos Geneticos del CIAT, quienes pueden proporcionar pequenas cantidades de semillas para propositos de investigacion. (CIAT