Implications and Policy Options of California's Reliance on Natural Gas

Examines existing and currently anticipated infrastructure, rising gas prices, and recurring supply problems, and looks at options to alleviate the problem. Part of a series of research reports that examines energy issues facing California

El depósito de la ría de Huelva: datos isotópicos para la determinación de su procedencia

Desde su descubrimiento en 1923, el Depósito la Ría de Huelva, compuesto por 400 objetos metálicos del s. X a.C., ha sido objeto de diversas interpreta ciones sobre su deposición y procedencia. Muestras de cinco objetos de diversa tipología de este Depósito han sido analizadas por medio de Isótopos de Plomo, confrontándose sus composiciones con los campos isotópicos de mineralizaciones regionales, peninsulares y mediterráneas. Los resultados indican que los ob jetos que componen el Depósito tendrían varios orígenes foráneos, siendo con sistentes en algún caso con mineralizaciones de Cerdeña. Tecnológicamente, el carácter de importación del Depósito concuerda con el registro arqueológico re gional

Latitudinal variation of the solar photospheric intensity

We have examined images from the Precision Solar Photometric Telescope (PSPT) at the Mauna Loa Solar Observatory (MLSO) in search of latitudinal variation in the solar photospheric intensity. Along with the expected brightening of the solar activity belts, we have found a weak enhancement of the mean continuum intensity at polar latitudes (continuum intensity enhancement $\sim0.1 - 0.2$ corresponding to a brightness temperature enhancement of $\sim2.5{\rm K}$). This appears to be thermal in origin and not due to a polar accumulation of weak magnetic elements, with both the continuum and CaIIK intensity distributions shifted towards higher values with little change in shape from their mid-latitude distributions. Since the enhancement is of low spatial frequency and of very small amplitude it is difficult to separate from systematic instrumental and processing errors. We provide a thorough discussion of these and conclude that the measurement captures real solar latitudinal intensity variations.Comment: 24 pages, 8 figs, accepted in Ap

Prehistoric mining and metallurgy in the Priorat and bordering areas (province of Tarragona). State of the issue

En los últimos 15 años se han desarrollado diversos proyectos de investigación centrados en la minería y la metalurgia prehistóricas en el Priorat. Gracias a estos, el conocimiento sobre este tema se ha visto notablemente incrementado hasta el punto de convertirse en el territorio del nordeste con más datos disponibles. El presente artículo tiene como objetivo mostrar este conjunto de nuevos datos (arqueológicos y arqueométricos) así como las interpretaciones que de ellos se derivan para avanzar en el conocimiento de la producción metalúrgica en las comunidades del Calcolítico y la Edad del Bronce.In the last 15 years a few research projects have been carried out focused on prehistoric mining and metallurgy in the Priorat area. Because of their results, knowledge on this subject has been increased significantly, to the point of becoming the territory of the Northeast of the Iberian Peninsula with more data available. Is the goal of this article to expose this set of new data (archaeological and archaeometric) as well as to treat the interpretations derived from them, advancing in the knowledge of metallurgical production in the Chalcolithic and Bronze Age communities

Análisis arqueometalúrgico de yacimiento calcolítico de “La Pijotilla” (Badajoz)

Los restos de carácter metalúrgico del yacimiento de La Pijotilla han sido so metidos a distintos métodos analíticos (XRF, Microsonda, Metalografías, Isóto pos de Plomo) para la caracterización de la tecnología metalúrgica Calcolítica, evaluar los procesos que se llevaban a cabo en el yacimiento y establecer pau tas en el aprovisionamiento de materias primas y/o objetos elaborados

Tissue biochemical diversity of 20 gooseberry cultivars and the effect of ethylene supplementation on postharvest life

The European gooseberry (Ribes uva-crispa) is still an understudied crop with limited data available on its biochemical profile and postharvest life. A variety of polyphenols were detected in the skin and flesh of 20 gooseberry cvs, representing mainly flavonol glycosides, anthocyanins and flavan-3-ols. In contrast, gooseberry seeds were for the first time characterised by the presence of considerable amounts of hydroxycinnamic acid glycosides tentatively identified by UPLC-QToF/MS. All cvs examined represented a good source of vitamin C while being low in sugar. Furthermore, the postharvest stability of bioactives was explored by supplementation of exogenous ethylene in air at 5 °C. Results suggest a low sensitivity of gooseberries to ethylene. The overall quality of gooseberries remained stable over two weeks, showing potential for extended bioactive life