Extending the operating temperature, wavelength and frequency response of HgCdTe heterodyne detectors

Near ideal optical heterodyne performance was obtained at GHz IF frequencies in the 10 micrometer wavelength region with liquid nitrogen cooled HgCdTe photodiodes. Heterodyne NEP's as low as 2.7 x 10 to the minus 20th power W/Hz at 100MHz, 5.4 x 10 to the minus 20th power W/Hz at 1.5 GHz, and 9.4 x 19 to the minus 20th power W/Hz at 3 GHz were achieved. Various physical phenomena which occur within a photodiode and affect heterodyne operation were examined in order to assess the feasibility of extending the operating temperature, wavelength, and frequency response of these HgCdTe photomixers

The Romance Novel Cover

Romance novel covers dating from the 1980s and 1990s reflect complex and contradictory ideas about gender, power, and sexuality. The covers overflow with stereotypes of what women are attracted to such as enormous pink roses, lush folds of silk, and hair long enough for Rapunzel. To this socially acceptable women’s imagery, the covers add two less reputable aspects: sexual imagery and, occasionally, suggestions of female submission. Since the association of romance and conventional femininity is so strong, the covers make a visual argument that submission and sexuality are things that a conventional woman wants. Readers have to deal with what it means to be seen reading a book with such a cover. This thesis aims to tackle how these covers have been regarded by both the consumer and producers of the works, and what political, social and visual trends in American culture of the 1980s and 1990s account for these genre conventions

NH3 in IRC plus 10216

Ammonia was detected in the circumstellar envelope of IRC +10216 by means of three infrared absorption lines in the nu sup 2 band around 950/cm. The lines are fully resolved at a resolution of 0.22 km/sec and indicate that most of the circumstellar gas is accelerated to expansion velocities around 14 km/sec within a few stellar radii. The NH3 profiles indicate a rotational temperature between 400 and 700 K, and H2 density between 10 to the 8th power/cu cm and 10 to the 10th power/cu cm, and NH3 column density of 10 to the 17th power/sq cm. The H2 density indicates that the mass of the circumstellar envelope within a 1 arcsec radius is approximately 0.1 solar masses

Discovering the catalysts for growing true disciples in an emerging postmodern culture

https://place.asburyseminary.edu/ecommonsatsdissertations/1247/thumbnail.jp

Relationships, Learning, and Motivation for One Virtual Literacy Camp during the COVID-19 Pandemic

This article focuses on one university literacy camp for kindergarten through sixth grade students that shifted from traditional in-person instruction to a virtual setting during the COVID-19 pandemic. The change from an in-person camp to a virtual camp setting created an opportunity for research in investigating students’ attitudes towards literacy, literacy learning, and participation within the newly formatted virtual literacy camp. Twenty-six kindergarten through sixth grade students were interviewed at the beginning and conclusion of a semester-long literacy camp regarding their attitudes toward learning and participation in the literacy camp. Throughout the data, researchers noted the theme of relationships as being prevalent with many participants sharing thoughts specifically in light of the lack of outside interaction during this more isolated era of time. The relationships built between the tutors and the students in this virtual camp were vital to the attitudes and the learning of these study participants. This study provides further direction for supporting students in a virtual literacy clinic setting

ISOWN: accurate somatic mutation identification in the absence of normal tissue controls.

BackgroundA key step in cancer genome analysis is the identification of somatic mutations in the tumor. This is typically done by comparing the genome of the tumor to the reference genome sequence derived from a normal tissue taken from the same donor. However, there are a variety of common scenarios in which matched normal tissue is not available for comparison.ResultsIn this work, we describe an algorithm to distinguish somatic single nucleotide variants (SNVs) in next-generation sequencing data from germline polymorphisms in the absence of normal samples using a machine learning approach. Our algorithm was evaluated using a family of supervised learning classifications across six different cancer types and ~1600 samples, including cell lines, fresh frozen tissues, and formalin-fixed paraffin-embedded tissues; we tested our algorithm with both deep targeted and whole-exome sequencing data. Our algorithm correctly classified between 95 and 98% of somatic mutations with F1-measure ranges from 75.9 to 98.6% depending on the tumor type. We have released the algorithm as a software package called ISOWN (Identification of SOmatic mutations Without matching Normal tissues).ConclusionsIn this work, we describe the development, implementation, and validation of ISOWN, an accurate algorithm for predicting somatic mutations in cancer tissues in the absence of matching normal tissues. ISOWN is available as Open Source under Apache License 2.0 from https://github.com/ikalatskaya/ISOWN

Variations in the spatial distribution of 11 Micron radiation from omicron Ceti

The spatial distribution of 11 micron radiation from omicron Ceti was observed at various phases of its light cycle using a stellar interferometer. Changes were seen which can be attributed to variation in the strength of thermal emission from circumstellar dust relative to the stellar continuum at 11 microns. These changes are shown to be correlated with the changes in luminosity of micron Ceti in such a way that dust grain emission at 11 microns was increased more than the continuum during the period of maximum luminosity. The degree of the change in dust grain emission implies that the maximum dust temperature is in the range of 500 K to 700 K during minimum stellar luminosity

The brightness distribution of IRC +10216 at 11 microns

The brightness distribution of IRC +10216 at a wavelength of 11 microns was measured in detail using a spatial interferometer. This brightness distribution appears to have azimuthal symmetry; an upper limit of 1.1 may be set to the ellipticity at 11 microns if the object has a major axis oriented either along or perpendicular to the major axis of the optical image. The radial distribution shows both compact and extended emission. The extended component, which is due to thermal emission from circumstellar dust, contributes 91% of the total flux and has a 1/e diameter of 0.90 minutes. The tapered shape of this component is consistent with a l/r squared dust density dependence. The compact component is unresolved (less than 0.2 minutes in diameter) and represents emission from the central star seen through the circumstellar envelope