Minor Planet Observations [841 Martin Observatory, Blacksburg

The Astronomical Journal

Using selection criteria based on amplitude, time and color, we have identified 329 objects as known or candidate cataclysmic variable (CVs) during the first year of testing and operation of the Zwicky Transient Facility (ZTF). Of these, 90 are previously confirmed CVs, 218 are strong candidates based on the shape and color of their light curves obtained during 3-562 days of observations, and the remaining 21 are possible CVs but with too few data points to be listed as good candidates. Almost half the strong candidates are within 10 deg of the galactic plane, in contrast to most other large surveys which have avoided crowded fields. The available Gaia parallaxes are consistent with sampling the low mass transfer CVs, as predicted by population models. Our followup spectra have confirmed Balmer/helium emission lines in 27 objects, with four showing high excitation HeII emission, including candidates for an AM CVn, a polar and an intermediate polar. Our results demonstrate that a complete survey of the galactic plane is needed to accomplish an accurate determination of the number of CVs existing in the Milky Way.

Data reports provide a medium for filing and archiving data compilations where little or no analysis is included. Such compilations commonly will have been prepared in support of other journal publications or reports. The subject matter of the series reflects the broad interests and policies of Fisheries and Oceans Canada, namely, fisheries management, technology and development, ocean sciences, and aquatic environments relevant to Canada.

Data reports provide a medium for filing and archiving data compilations where little or no analysis is included. Such compilations commonly will have been prepared in support of other journal publications or reports. The subject matter of the series reflects the broad interests and policies of Fisheries and Oceans Canada, namely, fisheries management, technology and development, ocean sciences, and aquatic environments relevant to Canada.

Planetary and Space Science, 2011

Appendix A. Unknown objects observed during out runs at ESO/MPG, Swope and INT. today fewer unknown objects than known MBAs and very few new NEOs. Using a 2m facility, a slightly larger number of unknown than known asteroids could be detected in the main belt. Between 0.1 and 0.8 new NEO candidates per square degree could be discovered using a 2m telescope.

Australian Journal of Physics - AUST J PHYS, 1982

Results are given for the radio continuum properties of an optically complete sample of 294 bright galaxies, 147 of which have been detected. Data were obtained with the 408 MHz Molonglo Radio Telescope. The radio luminosity functions for all galaxies and for spiral galaxies alone are derived and the radio emission for different galaxy types is investigated. Spectral indices of 73 galaxies which had been detected at other frequencies were derived; the mean index of a reliable subsample is equal to 0.71.

Planetary and Space Science, 2013

We report follow-up observations of 477 program Near-Earth Asteroids (NEAs) using nine telescopes of the EURONEAR network having apertures between 0.3 and 4.2 m. Adding these NEAs to our previous results we now count 739 program NEAs followed-up by the EURONEAR network since 2006. The targets were selected using EURONEAR planning tools focusing on high priority objects. Analyzing the resulting orbital improvements suggests astrometric follow-up is most important days to weeks after discovery, with recovery at a new opposition also valuable. Additionally we observed 40 survey fields spanning three nights covering 11 square degrees near opposition, using the Wide Field Camera on the 2.5m Isaac Newton Telescope (INT), resulting in 104 discovered main belt asteroids (MBAs) and another 626 unknown one-night objects. These fields, plus program NEA fields from the INT and from the wide field MOSAIC II camera on the Blanco 4m telescope, generated around 12,000 observations of 2,000 minor planets (mostly MBAs) observed in 34 square degrees. We identify Near Earth Object (NEO) candidates among the unknown (single night) objects using three selection criteria. Testing these criteria on the (known) program NEAs shows the best selection methods are our ǫ − µ model which checks solar elongation and sky motion and the MPC's NEO rating tool. Our new data show that on average 0.5 NEO candidates per square degree should be observable in a 2m-class survey (in agreement with past results), while an average of 2.7 NEO candidates per square degree should be observable in a 4m-class survey (although our Blanco statistics were affected by clouds). At opposition just over 100 MBAs (1.6 unknown to every 1 known) per square degree are detectable to R = 22 in a 2m survey based on the INT data (in accordance with other results), while our two best ecliptic Blanco fields away from opposition lead to 135 MBAs (2 unknown to every 1 known) to R = 23.

The Journal of biological chemistry, 2016

Using a high-throughput screening (HTS)-compatible assays for superoxide and hydrogen peroxide, we identified potential inhibitors of NADPH oxidase (Nox2) isoform from a small library of bioactive compounds. By using multiple probes (hydroethidine, hydropropidine, Amplex Red, and coumarin boronate) with well-defined redox chemistry that form highly diagnostic marker products upon reaction with superoxide (O2 (·-)), hydrogen peroxide (H2O2), and peroxynitrite (ONOO(-)), the number of false positives was greatly decreased. Selected hits for Nox2 were further screened for their ability to inhibit ONOO(-) formation in activated macrophages. New diagnostic marker product for ONOO(-) is reported. We conclude that the newly developed HTS/ROS assays could also be used to identify potential inhibitors of ONOO(-) formed from Nox2-derived O2 (·-) and nitric oxide synthase (NOS)-derived nitric oxide.

Data Series, 2007

Concentrations of chemical constituents in water are given either in milligrams per liter (mg/L) or micrograms per liter (µg/L). Concentrations of chlorophyll a (chl a) and ash free dry mass (AFDM) are given in grams per meter squared (g/m 2). Periphyton species composition densities are given in units per centimeter squared (units/cm 2). Periphyton biomass is given in micrograms per centimeter squared (µg/cm 2).

Atmosphere, 2021

Drought is one of the most complex climate-related phenomena and is expected to progressively affect our lives by causing very serious environmental and socioeconomic damage by the end of the 21st century. In this study, we have extracted a dataset of exceptional meteorological drought events between 1975 and 2019 at the country and subregional scales. Each drought event was described by its start and end date, intensity, severity, duration, areal extent, peak month and peak area. To define such drought events and their characteristics, separate analyses based on three drought indices were performed at 12-month timescale: the Standardized Precipitation Index (SPI), the Standardized Precipitation Evapotranspiration Index (SPEI), and the Reconnaissance Drought Index (RDI). A multivariate combined drought index (DXI) was developed by merging the previous three indices for more understanding of droughts’ features at the country and subregional levels. Principal component analysis (PCA) ...

Wits University, 2009

Both Ubombo and Vaalwater boys and girls are stunted and wasted. Boys are worse off than girls and needs urgent nutrition intervention.

2007

Monthly Notices of the Royal Astronomical Society, 2006

The Astrophysical …, 2002

We have conducted an automated search for galaxy clusters within a contiguous 16 square degree I−band survey in the north Galactic hemisphere. A matched filter detection algorithm identifies 444 cluster candidates in the range 0.2 < ∼ z < ∼ 1.2. The full catalog is presented along with the results from a follow-up spectroscopic survey. The estimated redshift distribution of the cluster candidates is consistent with a constant comoving density over the range 0.2 ≤ z est ≤ 0.8. A decline in the cluster space density by more than a factor of 3 over this redshift range is rejected at > 99.9% confidence level. We find that the space density of Λ CL ≥ 40 clusters in our survey lies in the range (1.6 − 1.8) × 10 −5 h 3 75 Mpc −3 , ∼ 1.5 times higher than the local distribution of comparably rich Abell RC ≥ 0 clusters. The Λ CL distribution is consistent with a power-law. The discrepancy between the space density of Abell clusters and the clusters in this survey declines quickly as Λ CL increases, suggesting that the difference at lower richness is due to significant incompleteness in the Abell catalog. A percolation analysis reveals that 10 -20% of the spectroscopically confirmed distant clusters are linked into superclusters at overdensities between 10 < δρ/ρ < 50, similar to what is seen in the local cluster distribution. This suggests that there has been little evolution of the cluster-cluster correlation length for z < ∼ 0.5.

OF THESIS THERMAL LANDSCAPES: TEMPERATURE AND SITE PLACEMENT IN NORTHWEST WYOMING Biotic communities are shaped primarily by interactions between temperature, effective moisture, topography, soil, disturbance regime and time. In a montane ecosystem, temperature and effective moisture vary with topography across short distances. These topographically driven changes cause concordant variation in habitat structure. Prehistoric hunter-gatherers in a montane ecosystem may have incorporated topography, temperature, and habitat structure into site placement strategies. This study seeks to understand the correlation between topographically mediated temperature gradients (the thermal landscape) and montane prehistoric activity areas. Over 50 newly recorded prehistoric sites have been identified in the Central Absaroka Range in Northwest Wyoming. In order to test the hypothesis of temperature effecting site choice, thermal landscapes were constructed by placing data collectors across the two watersheds, Greybull and Jack Creek, within the study area. The gauges were placed at elevation gradients to capture topographic change. Gauges were also placed on prehistoric sites ranging from 7500 Before Present (BP) to 100 BP in age. Temperature gradients were compared to the surficial archaeological record to test a temperature-driven prehistoric site placement hypothesis. It was determined, contrary to the main hypothesis that the sites would be placed in warmer locations, that the archaeological sites actually recorded the coolest nighttime temperatures regardless of elevation. There are some demonstrated iv correlations between nighttime temperatures and site placement in the montane watersheds.