Time-Series Analysis of Super-Kamiokande Measurements of the Solar Neutrino Flux

The Super-Kamiokande Consortium has recently released data suitable for time-series analysis. The binning is highly regular: the power spectrum of the acquisition times has a huge peak (power S > 120) at the frequency (in cycles per year) 35.98 (period 10.15 days), where power measurements are such that the probability of obtaining a peak of strength S or more by chance at a specified frequency is exp(-S). This inevitably leads to severe aliasing of the power spectrum. The strongest peak in the range 0 - 100 in a power spectrum formed by a likelihood procedure is at 26.57 (period 13.75 days) with S = 11.26. For the range 0 - 40, the second-strongest peak is at 9.42 (period 38.82 days) with S = 7.3. Since 26.57 + 9.42 = 35.99, we conclude that the weaker peak at 9.42 is an alias of the stronger peak at 26.57. We note that 26.57 falls in the band 26.36 - 27.66, formed from twice the range of synodic rotation frequencies of an equatorial section of the Sun for normalized radius larger than 0.1. Oscillations at twice the rotation frequency, attributable to "m = 2" structures, are not uncommon in solar data. We find from the shuffle test that the probability of obtaining a peak of S = 11.26 or more by chance in this band is 0.1 %. This new result therefore supports at the 99.9% confidence level previous evidence, found in Homestake and GALLEX-GNO data, for rotational modulation of the solar neutrino flux. The frequency 25.57 points to a source of modulation at or near the tachocline.Comment: 15 pages, 8 figure

Is the galactic corona produced by galactic flares?

The effect of the differential rotation of the disk of the Galaxy on magnetic field which penetrates the disk is considered. The magnetic field will be progressively distorted from a potential (current-free) form and will at some stage become unstable. It is expected that an MHD instability, a resistive instability, or a combination of the two, will result in the release of the excess magnetic energy and that part of the released energy will be converted into heat. By estimating the energy release and the rate at which this process will occur and by assuming that this energy input is balanced by radiation, estimates were obtained of the parameters of the resulting plasma. It appears that this process alone can heat a galactic corona to temperatures of order 10 to the 6th power K

Generational accounts for the United States: an update

An examination of the continuing generational imbalance in U.S. fiscal policy, showing that under current policy, future generations will have to pay almost half of their lifetime labor incomes in net taxes to balance the government's book--more than 70% greater than the 28.6% today's newborns are slated to give up.Fiscal policy ; Taxation

Cambio climático y enfermedades forestales: uso de los conocimientos actuales para hacer frente a los retos del Futuro

The health of the earth’s forests and urban green spaces is increasingly challenged by the outcomes of human activities, including global climate change. As climate changes, the role and impact of diseases on trees in both forest ecosystems and in urban settings will also change. Knowledge of relationships between climate variables and diseases affecting forest and urban trees is reviewed, with specific emphasis on those affecting foliage, shoots, and stems. Evidence that forest diseases are already responding to the earth’s changing climate is examined (e.g., Dothistroma needle blight in northern British Columbia) as are predicted scenarios for future changes in impact on forests by other tree diseases. Outbreaks of tree diseases caused by native and alien pathogens are predicted to become more frequent and intense – this and other general predictions about the effects of climate change on forest and tree diseases are discussed. Despite the uncertainty that accompanies such predictions it is imperative that researchers, forest and urban tree managers, and policy makers work together to develop and implement management strategies that enhance the resilience of the worlds’ forests and urbanized trees. Strategies discussed include monitoring, forecasting, planning, and mitigation.La salud de los bosques y los espacios verdes urbanos está cada vez más cuestionada por los resultados de las actividades humanas, incluyendo el cambio climático global. Así como el clima cambia, también cambiarán el papel y el impacto de las enfermedades en los árboles en los ecosistemas forestales y en las zonas urbanas. En este artículo se revisa el conocimiento de las relaciones entre las variables climáticas y las enfermedades que afectan a los árboles forestales y urbanos, con especial hincapié en lo que afecta al follaje, los brotes y los troncos. Se examina la evidencia de que las enfermedades forestales ya están respondiendo al cambio climático (por ejemplo, el tizón de la hoja de Dothistroma en el norte de la Columbia Británica), como prevén escenarios de futuros cambios en el impacto sobre los bosques por otras enfermedades de los árboles. Los brotes de enfermedades causadas por patógenos de árboles nativos y exótico se prevé que sean cada vez más frecuentes e intensos – se discuten esta y otras predicciones generales sobre los efectos del cambio climático sobre los bosques y las enfermedades de los árboles. A pesar de la incertidumbre que acompaña a tales predicciones es imperativo que los investigadores y los responsables de la gestión de los bosques y árboles urbanos cooperen para desarrollar e implementar estrategias de manejo que mejoran la capacidad de recuperación de los bosques y los árboles urbanos. Las estrategias analizadas incluyen el monitoreo, la previsión, la planificación y la mitigación

The preparation of ketene dithioacetals and thiophenes from chloropyridines containing an active methylene group

The base catalysed reaction of carbon disulphide with the active methylene groups of chloropyridines 4 and 7, followed by alkylation with reagents which also contain active methylene groups, lead to ketene dithioacetals. Further reaction with base afforded highly substituted thiophenes

Additional experimental evidence for a solar influence on nuclear decay rates

Additional experimental evidence is presented in support of the recent hypothesis that a possible solar influence could explain fluctuations observed in the measured decay rates of some isotopes. These data were obtained during routine weekly calibrations of an instrument used for radiological safety at The Ohio State University Research Reactor using Cl-36. The detector system used was based on a Geiger-Mueller gas detector, which is a robust detector system with very low susceptibility to environmental changes. A clear annual variation is evident in the data, with a maximum relative count rate observed in January/February, and a minimum relative count rate observed in July/August, for seven successive years from July 2005 to June 2011. This annual variation is not likely to have arisen from changes in the detector surroundings, as we show here.Comment: 8 pages, 6 figure