Solventless LARC-160 Polyimide Matrix Resin

The addition polyimide, LARC-160, which was originally synthesized from low cost liquid monomers as a laminating resin in ethanol, was prepared as a solventless, high viscosity, neat liquid resin. The resin was processed by hot-melt coating techniques into graphite prepreg with excellent tack and drape. Comparable data on graphite reinforced laminates made from solvent-coated and various hot-melt coated prepreg were generated. LARC-160, because of its liquid nature, can be easily autoclave processed to produce low void laminates. Liquid chromatographic fingerprints indicate good reaction control on resin scale ups. Minor changes in monomer ratios were also made to improve the thermal aging performance of graphite laminates

Gas Bubbles Emerging from a Submerged Granular Bed

This fluid dynamics video was submitted to the Gallery of Fluid Motion for the 2009 APS Division of Fluid Dynamics Meeting in Minneapolis, Minnesota. In this video we show some results from a simple experiment where air was injected by a single nozzle at known constant flow rates in the bottom of a granular bed submerged in water. The injected air propagates through the granular bed in one of two modes. Mode 1 emergence involves small discrete bubbles taking tortuous paths through the interstitial space of the bed. Multiple small bubbles can be emitted from the bed in an array of locations at the same time during Mode 1 emergence. Mode 2 emergence involves large discrete bubbles locally fluidizing the granular bed and exiting the bed approximately above the injection site. Bead diameter, bead density, and air flow rate were varied to investigate the change in bubble release behavior at the top of the granular bed. This system is a useful model for methane seeps in lakes. Methane bubbles are released from the decomposition of organic matter in the lake bed. The initial size of the bubble determines how much of the gas is absorbed into the lake and how much of the gas reaches the surface and is released into the atmosphere. The size and behavior of the emerging bubbles may also affect the amount of vertical mixing occurring in the lake, as well as the mixing from the lake bed into the benthic layer.Comment: 2009 APS DFD Gallery of Fluid Motion Submissio

ADOLESCENTS\u27 GENDER TYPICALITY, PSYCHOLOGICAL WELL-BEING, AND EXPERIENCES WITH TEASING, BULLYING, AND REJECTION

The current study examined whether adolescents’ gender-based victimization experiences (i.e., teasing, bullying, and rejection) mediated the association between gender typicality and psychological well-being. The current study also investigated whether daily experiences with the three types of gender-based victimization negatively impacted adolescents’ immediate emotional reactions. Participants were 570 seventh and eighth grade students (49.5% boys, 50.5% girls). During four visits over the course of two weeks, participants completed surveys about their own gender typicality, their psychological well-being (i.e., depression, anxiety, self-esteem, and body image), their experiences with gender-based teasing, bullying, and rejection, and their emotional responses to experiencing this victimization. Results indicated that experiences with gender-based teasing, bullying, and rejection mediated the association between gender typicality and psychological well-being. In addition, adolescents with worse initial psychological well-being and who experienced more rejection reported experiencing more negative emotional responses after victimization. The implications of these findings are discussed

The Effect of Volunteering on the Attitudes of Selected Parents toward the Regular School Program

An applied project submitted in partial fulfillment of the requirements for the degree of Education Specialist at Morehead State University by Jewell A. Cline on May 6, 1977

Plan of Gardens and First Floor Chateau Pathe

A plan of Gardens and first floor of Chateau Pathe in Seine, France which details locations of military offices and facilities on the grounds.https://corescholar.libraries.wright.edu/special_ms53_ephemera/1006/thumbnail.jp

Birth Injury in Relation to Mental Deficiency

The study of birth injury as a major cause of non-hereditary feeble-mindedness and as a category of mental subnormality is comparatively new but rapidly progressing. Some of the major aims of such a study have been to use orthopedic diagnosis and treatment and to perfect evaluation of mental examination methods for these cases as well as to develop better standards of measurement. The mental growth of these children is known to begin later and continue longer than that of other groups of defective children. This would indicate that training of a special type should begin early and continue beyond the usual limits. The value of muscle training in the earlier years of these children\u27s lives seems to be proving its value as a means of opening windows for their intellectual growth. Outside of the value of such a study to the children involved, there is the point of view of scientific research which indicates the better understanding of the relation of all adjustment to cerebral structure

Energy policy: Renewables targeted before Fukushima

Masahiro Sugiyama and colleagues write that Japan expanded the role of renewables after the 2011 Fukushima Daiichi nuclear accident (Nature 531, 29–31; 2016). In fact, Japan's targets for renewables were essentially unaffected by the disaster — although the country did alter its nuclear plans. Japan's projected electricity mix for 2030 is set out in its Strategic Energy Plans. The 2014 plan (see go.nature.com/xnkn4k) aims to cut nuclear power's contribution to 20–22% by 2030, down from 53% in the 2010 plan (J. Duffield and B. Woodall Energy Policy 39, 3741–3749; 2011). Fossil fuels, not renewables, are set to make up the shortfall — with the projected contribution for 2030 up by 30% compared with the 2010 plan. Meanwhile, the 2014 plan's 23% contribution from renewables by 2030 is almost unchanged (21% in the 2010 plan). The authors rightly praise Japan's post-Fukushima attempt to expand solar power. For several decades, the country has developed this technology alongside nuclear power (R. Bointner Energy Policy 73, 733–747; 2014). Japanese companies such as Sharp, Sanyo and Kyocera pioneered solar energy, whereas Hitachi, Mitsubishi and Toshiba became leaders in nuclear power. It is good news for the global climate that these technologies can be developed alongside each other

Formation of Low Threshold Voltage Microlasers

Vertical cavity surface emitting lasers (VCSELs) with threshold voltages of 1.7V have been fabricated. The resistance-area product in these new vertical cavity lasers is comparable to that of edge-emitting lasers, and threshold currents as low as 3 mA have been measured. Molecular beam epitaxy was used to grow n-type mirrors, a quantum well active region, and a heavily Be-doped p-contact. After contact definition and alloying, passive high-reflectivity mirrors were deposited by reactive sputter deposition of SiO2/Si3N4 to complete the laser cavity

Application of Monte Carlo Algorithms to the Bayesian Analysis of the Cosmic Microwave Background

Power spectrum estimation and evaluation of associated errors in the presence of incomplete sky coverage; non-homogeneous, correlated instrumental noise; and foreground emission is a problem of central importance for the extraction of cosmological information from the cosmic microwave background. We develop a Monte Carlo approach for the maximum likelihood estimation of the power spectrum. The method is based on an identity for the Bayesian posterior as a marginalization over unknowns. Maximization of the posterior involves the computation of expectation values as a sample average from maps of the cosmic microwave background and foregrounds given some current estimate of the power spectrum or cosmological model, and some assumed statistical characterization of the foregrounds. Maps of the CMB are sampled by a linear transform of a Gaussian white noise process, implemented numerically with conjugate gradient descent. For time series data with N_{t} samples, and N pixels on the sphere, the method has a computational expense $KO[N^{2} +- N_{t} +AFw-log N_{t}], where K is a prefactor determined by the convergence rate of conjugate gradient descent. Preconditioners for conjugate gradient descent are given for scans close to great circle paths, and the method allows partial sky coverage for these cases by numerically marginalizing over the unobserved, or removed, region.Comment: submitted to Ap