5,734 research outputs found
Displaced Mothers, Absent and Unnatural Fathers: LGBT Transracial Adoption
While some might believe that Black versus gay discourse only surfaces in highly politicized settings like the military and marriage, it holds sway in the area of LGBT transracial adoption. LGBT transracial adoptions are a relatively small percentage of all adoptions, which include private adoptions, LGBT second-parent adoptions, and step-parent adoptions, but they are an important site for interrogating the Black versus gay discourse because adoption and custody decisions often address parent-child transmission. When claims intersect, as they do in a case where a White LGBT foster parent and a Black maternal grandmother dispute the adoption of a Black child, weakened race-based claims and LGBT transmission fears inform the court\u27s decision. Disrupting the media staging of Black versus gay could provide courts better insight into how weakened race claims and LGBT transmission fears pull in opposite directions, and this would create the conditions for better, more innovative family decisions. If courts had a better understanding of the apparent competition between race and orientation, but also understood the costs attached to the media staging of the discourse, decision making in adoption and custody cases could be more comprehensive, taking into account the common interests in the children at issue. Understanding the costs that result from the media staging of Black versus gay discourse is key to finding common ground for identity groups and helping children of color already in LGBT homes. Black versus gay discourse is dangerous because of the structural costs that come with continued reliance on pernicious stereotypes of Black and gay. Looking at media and advocacy sources about LGBT transracial adoption, it appears as though rich, White gay men who adopt dangerous, damaged Black children may be the answer to racism, the superabundance of children in foster care, and poverty and criminality. This narrative looks like the gentrification of Black children by the gay community. This is dangerous because it imagines that Black is not gay and gay is not Black. It also displaces Black women as rightful, loving, and capable mothers and obscures the contributions of LGBTs of color and those with lower incomes, many of whom are mothers and fathers
Experimental investigation of planar ion traps
Chiaverini et al. [Quant. Inf. Comput. 5, 419 (2005)] recently suggested a
linear Paul trap geometry for ion trap quantum computation that places all of
the electrodes in a plane. Such planar ion traps are compatible with modern
semiconductor fabrication techniques and can be scaled to make compact, many
zone traps. In this paper we present an experimental realization of planar ion
traps using electrodes on a printed circuit board to trap linear chains of tens
of 0.44 micron diameter charged particles in a vacuum of 15 Pa (0.1 torr). With
these traps we address concerns about the low trap depth of planar ion traps
and develop control electrode layouts for moving ions between trap zones
without facing some of the technical difficulties involved in an atomic ion
trap experiment. Specifically, we use a trap with 36 zones (77 electrodes)
arranged in a cross to demonstrate loading from a traditional four rod linear
Paul trap, linear ion movement, splitting and joining of ion chains, and
movement of ions through intersections. We further propose an additional DC
biased electrode above the trap which increases the trap depth dramatically,
and a novel planar ion trap geometry that generates a two dimensional lattice
of point Paul traps.Comment: 11 pages, 20 figure
ASTRO-F - The next generation of mid-infrared surveys
We present basic observational strategies for ASTRO-F (also known as the
Imaging Infra Red Surveyor (IRIS)) to be launched in 2004 by the Japanese
Institute of Space and Astronautical Science (ISAS). We examine 2 survey
scenarios, a deep ~1sq.deg. survey reaching sensitivities an order of magnitude
below than the deepest surveys performed by ISO in the mid-IR, and a shallow
\~18sq.deg mid-infrared (7-25um in 6 bands) covering an area greater than the
entire area covered by all ISO mid-IR surveys. Using 2 cosmological models the
number of galaxies predicted for each survey is calculated. The first model
uses an enhancement of the pure luminosity evolution model of Pearson &
Rowan-Robinson while the new models incorporate a strongly evolving ULIG
component. For the deep survey, between 20,000-30,000 galaxies should be
detected in the shortest wavebands and ~5000 in the longest (25um) band. The
shallow survey would be expected to detect of the order of 100,000 - 150,000
sources.Comment: 17 pages, 13 figures, accepted by MNRA
Spitzer Observations of the North Ecliptic Pole
We present a photometric catalog for Spitzer Space Telescope warm mission
observations of the North Ecliptic Pole (NEP; centered at , ). The observations are
conducted with IRAC in 3.6 m and 4.5 m bands over an area of 7.04
deg reaching 1 depths of 1.29 Jy and 0.79 Jy in the 3.6
m and 4.5 m bands respectively. The photometric catalog contains
380,858 sources with 3.6 m and 4.5 m band photometry over the
full-depth NEP mosaic. Point source completeness simulations show that the
catalog is 80% complete down to 19.7 AB. The accompanying catalog can be
utilized in constraining the physical properties of extra-galactic objects,
studying the AGN population, measuring the infrared colors of stellar objects,
and studying the extra-galactic infrared background light.Comment: 10 pages, 11 figures and 3 tables. Accepted to the ApJ
Multi-wavelength analysis of 18um-selected galaxies in the AKARI/IRC monitor field towards the North Ecliptic Pole
We present an initial analysis of AKARI 18um-selected galaxies using all 9
photometric bands at 2-24um available in the InfraRed Camera (IRC), in order to
demonstrate new capabilities of AKARI cosmological surveys. We detected 72
sources at 18um in an area of 50.2 arcmin^2 in the AKARI/IRC monitor field
towards the North Ecliptic Pole (NEP). From this sample, 25 galaxies with
probable redshifts z>~ 0.5 are selected with a single colour cut (N2-N3>0.1)
for a detailed SED analysis with ground-based BVRi'z'JK data. Using an SED
radiative transfer model of starbursts covering the wavelength range UV --
submm, we derive photometric redshifts from the optical-MIR SEDs of
18um-selected galaxies. From the best-fit SED models, we show that the IRC
all-band photometry is capable of tracing the steep rise in flux at the blue
side of the PAH 6.2um emission feature. This indicates that the IRC all-band
photometry is useful to constrain the redshift of infrared galaxies,
specifically for dusty galaxies with a less prominent 4000A break. Also, we
find that the flux dip between the PAH 7.7 and 11.2um emission feature is
recognizable in the observed SEDs of galaxies at z~1. By using such a colour
anomaly due to the PAH and silicate absorption features, unique samples of
ULIRGs at z~1, `silicate-break' galaxies, can be constructed from large
cosmological surveys of AKARI towards the NEP, i.e. the NEP-Deep and NEP-Wide
survey. This pilot study suggests the possibility of detecting many interesting
galaxy properties in the NEP-Deep and Wide surveys, such as a systematic
difference in SEDs between high- and low-z ULIRGs, and a large variation of the
PAH inter-band strength ratio in galaxies at high redshifts. [abridged]Comment: Accepted for publication in PASJ, AKARI special issu
Zinc oxide thin-film transistors fabricated at low temperature by chemical spray pyrolysis
We report the electrical behavior of undoped zinc oxide thin-film transistors (TFTs) fabricated by low-temperature chemical spray pyrolysis. An aerosol system utilizing aerodynamic focusing was used to deposit the ZnO. Polycrystalline films were subsequently formed by annealing at the relatively low temperature of 140°C. The saturation mobility of the TFTs was 2 cm2/Vs, which is the highest reported for undoped ZnO TFTs manufactured below 150°C. The devices also had an on/off ratio of 104 and a threshold voltage of −3.5 V. These values were found to depend reversibly on measurement conditions
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