Serpents of the Ark-La-Tex

Slides and notes from a presentation focusing on the snakes of western Arkansas, northeastern Texas, and the Edwards Plateau of central Texas

A Teacher\u27S Guide To Understanding Attention-Deficit/Hyperactivity Disorder (Adhd)

Over the past decade, cognitive and behavior problems, characterized by symptoms of inattention, impulsivity, and hyperactivity, have affected millions of children around the world. Collectively, these symptoms are referred to as Attention Deficit Hyperactivity Disorder (ADHD; [American Psychiatric Association, 1994), and it is the most commonly diagnosed psychiatric disorder (Barkley, 1990). The collective problems that define ADHD contribute to one of the most complex childhood disorders of this time (Goldstein & Goldstein, 1998). Typically, the symptoms of ADHD are exacerbated in school settings where high demands are placed on children. Because ADHD is so prevalent in academia, teachers need to fully understand the disorder (e.g., history, symptoms, diagnostic criteria, and treatment) in order to better serve the needs of their students in the classroom

Laboratory and tentative interstellar detection of trans-methyl formate using the publicly available Green Bank Telescope PRIMOS survey

The rotational spectrum of the higher-energy trans conformational isomer of methyl formate has been assigned for the first time using several pulsed-jet Fourier transform microwave spectrometers in the 6-60 GHz frequency range. This species has also been sought toward the Sagittarius B2(N) molecular cloud using the publicly available PRIMOS survey from the Green Bank Telescope. We detect seven absorption features in the survey that coincide with laboratory transitions of trans-methyl formate, from which we derive a column density of 3.1 (+2.6, -1.2) \times 10^13 cm-2 and a rotational temperature of 7.6 \pm 1.5 K. This excitation temperature is significantly lower than that of the more stable cis conformer in the same source but is consistent with that of other complex molecular species recently detected in Sgr B2(N). The difference in the rotational temperatures of the two conformers suggests that they have different spatial distributions in this source. As the abundance of trans-methyl formate is far higher than would be expected if the cis and trans conformers are in thermodynamic equilibrium, processes that could preferentially form trans-methyl formate in this region are discussed. We also discuss measurements that could be performed to make this detection more certain. This manuscript demonstrates how publicly available broadband radio astronomical surveys of chemically rich molecular clouds can be used in conjunction with laboratory rotational spectroscopy to search for new molecules in the interstellar medium.Comment: 40 pages, 7 figures, 4 tables; accepted for publication in Ap

Multilevel metallization method for fabricating a metal oxide semiconductor device

An improved method is described of constructing a metal oxide semiconductor device having multiple layers of metal deposited by dc magnetron sputtering at low dc voltages and low substrate temperatures. The method provides multilevel interconnections and cross over between individual circuit elements in integrated circuits without significantly reducing the reliability or seriously affecting the yield

Abraham Lincoln Entering Richmond, April 3rd 1865

The black and white engraving depicts President Abraham Lincoln walking through a crowd with his son, Tad, in Richmond, Virginia. The crowd is made up of white and black spectators who cheer as the President walks through the street. engraved by John Chester Buttre (American, 1821-1893), drawn by L. Hollis, published byhttps://scholarsjunction.msstate.edu/fvw-prints/1911/thumbnail.jp

Impacts of Using Tubular Sections in Open Web Steel Joists

Open web steel joists are lightweight structural trusses used in place of I-beams to support long-span floors and roofs of open space buildings. Their slender geometry makes them highly efficient in resisting flexure, but susceptible to out-of-plane buckling in a failure mode known as lateral-torsional buckling. This failure can be avoided by running lateral bracing between joists called bridging or potentially by using tubular sections to build up the joists rather than angle sections. It is possible that a joist design using tubular cross-sections could require less bridging and prevent the need to use erection bridging for initial joist construction. Tubular sections provide good resistance to bending along with significantly higher resistance to torsion. While torsion resistance has little impact on capacity on small unbraced lengths, it has high impacts on large unbraced lengths. This thesis examines the structural characteristics of a tubular design for a 32LH06 joist layout and the results suggest a change to the joist cross-section to increase the joist efficiency. The findings indicate that a tubular design can provide required torsional stability while improving safety for installers

High and low threshold P-channel metal oxide semiconductor process and description of microelectronics facility

The fabrication techniques and detail procedures for creating P-channel Metal-Oxide-Semiconductor (P-MOS) integrated circuits at George C. Marshall Space Flight Center (MSFC) are described. Examples of P-MOS integrated circuits fabricated at MSFC together with functional descriptions of each are given. Typical electrical characteristics of high and low threshold P-MOS discrete devices under given conditions are provided. A general description of MSFC design, mask making, packaging, and testing procedures is included. The capabilities described in this report are being utilized in: (1) research and development of new technology, (2) education of individuals in the various disciplines and technologies of the field of microelectronics, and (3) fabrication of many types of specially designed integrated circuits which are not commercially feasible in small quantities for in-house research and development programs

Sexual selection shapes development and maturation rates in Drosophila.

Explanations for the evolution of delayed maturity usually invoke trade-offs mediated by growth, but processes of reproductive maturation continue long after growth has ceased. Here, we tested whether sexual selection shapes the rate of posteclosion maturation in the fruit fly Drosophila melanogaster. We found that populations maintained for more than 100 generations under a short generation time and polygamous mating system evolved faster posteclosion maturation and faster egg-to-adult development of males, when compared to populations kept under short generations and randomized monogamy that eliminated sexual selection. An independent assay demonstrated that more mature males have higher fitness under polygamy, but this advantage disappears under monogamy. In contrast, for females greater maturity was equally advantageous under polygamy and monogamy. Furthermore, monogamous populations evolved faster development and maturation of females relative to polygamous populations, with no detectable trade-offs with adult size or egg-to-adult survival. These results suggest that a major aspect of male maturation involves developing traits that increase success in sexual competition, whereas female maturation is not limited by investment in traits involved in mate choice or defense against male antagonism. Moreover, rates of juvenile development and adult maturation can readily evolve in opposite directions in the two sexes, possibly implicating polymorphisms with sexually antagonistic pleiotropy