Radionuclide Concentrations in the Arkansas River Upstream and Downstream from the Nuclear I Power Generating Facility

This report summarizes results obtained from a program designed to measure very low levels of some commonly produced radionuc1ides in the Dardenelle Lake area of the Arkansas River near the Arkansas Nuclear I Power Station operated by Arkansas Power and Light Company. The main thrust of this program was to determine the increase in the concentration of the radionuclides as a result of reactor operation as a function of their distance from the source. It was hoped to extend this study to include the effects of these emissions on the uptake of radionuclides into biological systems and their deposition in sediments

Fate of Some Common Radionuclides Found in Dardanelle Lake

Four factors influence the concentrations of radionuclides in Dardanelle Lake water: injections due to fallout and discharge from Nuclear I coupled with losses due to decay, to dilution and to sedimentation. It is possible to estimate the first three factors and to measure monthly changes in the concentrations of Sr-89, Ce-141, Cs-137, Co-38, Ce-144, and Sr-90 - Y-90 during periods when the concentrations of these nuclides are abnormally high (after large releases or the Chinese weapons tests) or abnormally low (during reactor refueling)

Sexual diversity in the judiciary in England and Wales; research on barriers to judicial careers

Debates about the diversity of the judiciary in the UK have been dominated by gender, race and ethnicity. Sexuality is notable by its absence and is perceived to pose particular challenges. It is usually missing from the list of diversity categories. When present, its appearance is nominal. One effect of this has been a total lack of official data on the sexual composition of the judiciary. Another is the gap in research on the barriers to the goal of a more sexually diverse judiciary. In 2008 the Judicial Appointment Commission (JAC) for England and Wales undertook research to better understand the challenges limiting progress towards judicial diversity. A central gaol of the project was to investigate barriers to application for judicial appointment across different groups defined by “sex, ethnicity and employment status”. Sexual orientation was again noticeable by its absence. Its absence was yet another missed opportunity to recognise and take seriously this strand of diversity. This study is based on a response to that absence. A stakeholder organisation, InterLaw Diversity Forum for lesbian gay bisexual and transgender networks in the legal services sector, with the JAC’s approval, used their questionnaire and for the first time asked lesbian, gay, bisexual and transgender lawyers about the perceptions and experiences of barriers to judicial appointment. This paper examines the findings of that unique research and considers them in the light of the initial research on barriers to judicial appointment and subsequent developments

Lucius Chittenden\u27s journey to the inside of the earth transcribed and annotated by Michael N. Stanton.

Occasional paper (University of Vermont. Center for Research on Vermont) ; #17. Introduction -- A note on the text -- [ To the inside of the Earth! ] -- The nebular hypothesis -- Chambers makes planets -- They plan the expedition -- Las diablos del Volcan -- A discussion concerning air and heat -- Appendix : the discussion -- A note on the transcriber and annotater

Reproduction, movements, and population dynamics of the southern kingfish, Menticirrhus americanus, in the northwestern Gulf of Mexico

Menlicirrhus americanus in the northwestern Gulf of Mexico mature at 150-220 mm TL and 12-14 months of age, with males maturing when 10-40 mm smaller than females. Spawning occurs within a broad period from February through November with two discrete peaks which coincide with the periodicity of downcoast alongshore currents (towards Mexico) in spring and fall. This species occurs at depths of less than 5 to 27 m, being most abundant at 5 m or shallower. Young-of-the-year recruit primarily at 5-9 m or shallower and gradually expand their bathymetric range. Age determination by length frequency is feasible in M. americanus but not as simple as in species that spawn in one major period of the year. Only one or two spawned groups normally predominated at anyone time and no more than three co-occurred with few possible exceptions. Observed mean sizes were 138 mm TL at 6 months, and 192 and 272 mm at ages I and II, respectively. Typical maximum size was 296-308 mm and typical maximum age is probably 2-3 years. The largest fISh captured were 392 and 455 mm. Observed sex ratio was 1.2 females to 1 male. Weight, girth, and length-length regressions are presented.(PDF file contains 27 pages.

A study of hte simultaneous leaching and solvent extraction of copper from malachite

Imperial Users onl

Empirical Model for the Variarion in Concentration of Metal Ions During a Precipitation Event

The concentration of a pollutant in an air mass and the concentration of that pollutant in a series of rain water samples from a single event within that air mass, fluctuate during the course of the event. This the result of scavenging, diffusion, and advection processes. A simple mathematical model, containing only a scavenging term has had limited success in describing changes of concentration in rain water. To date, no attempt has been made to include diffusion or advection terms in the model. In this study, a two factor model was developed after determining that (1) the exponential scavenging term is dependent upon the amount of precipitation that has fallen rather than time elapsed and (2) that the magnitude of the diffusion/advection term is inversely proportional to the precipitation rate. Coefficients for the variables in the two terms [Psiav and (bCf), respectively] were determined by the best fit of concentration curve derived from the model equation to experimental points. Time series from 24 rain events samples collected during 1987-88 and during the spring of 1998 were analyzed. The values of Psiav were remarkably constant during both periods, but the two groups of Psiav were different. The values of (bCf) correlated moderately well with the concentrations of ions in the samples

Global MHD Simulations of Neptune's Magnetosphere

A global magnetohydrodynamic (MHD) simulation has been performed in order to investigate the outer boundaries of Neptune's magnetosphere at the time of Voyager 2's flyby in 1989 and to better understand the dynamics of magnetospheres formed by highly inclined planetary dipoles. Using the MHD code Gorgon, we have implemented a precessing dipole to mimic Neptune's tilted magnetic field and rotation axes. By using the solar wind parameters measured by Voyager 2, the simulation is verified by finding good agreement with Voyager 2 magnetometer observations. Overall, there is a large-scale reconfiguration of magnetic topology and plasma distribution. During the “pole-on” magnetospheric configuration, there only exists one tail current sheet, contained between a rarefied lobe region which extends outward from the dayside cusp, and a lobe region attached to the nightside cusp. It is found that the tail current always closes to the magnetopause current system, rather than closing in on itself, as suggested by other models. The bow shock position and shape is found to be dependent on Neptune's daily rotation, with maximum standoff being during the pole-on case. Reconnection is found on the magnetopause but is highly modulated by the interplanetary magnetic field (IMF) and time of day, turning “off” and “on” when the magnetic shear between the IMF and planetary fields is large enough. The simulation shows that the most likely location for reconnection to occur during Voyager 2's flyby was far from the spacecraft trajectory, which may explain the relative lack of associated signatures in the observations