Laboratory studies of the interaction of ions with condensed gases: Planetary applications

The work described is concerned with laboratory studies of the processes that produce the ejection of molecules from the surfaces of condensed gas solids, the change in the chemistry of the surface materials, and the relationship of these results to processes occurring in the solar system. Included is a discussion of the experimental techniques employed in making these laboratory measurements

Drag coefficients for spheres for free molecular flow in nitrogen at satellites' velocities

Momentum transfer by nitrogen molecular beam to surfaces measured as function of angle of incidenc

The Impact of Federal Reserve Monetary Policy on Sector ETF and Market Cap ETF Performance

This study explores the impact of Federal Reserve policy changes on returns and volatility of U.S. equity markets, including large cap, mid cap, and small cap as well as the eleven sectors of the S&P 500. Federal Reserve policy changes in this study are measured by changes in the federal funds target rate. To measure the impact of these rates on U.S. equity markets, I construct a longitudinal dataset inclusive of exchange traded funds (ETFs) that serve as proxies for all eleven sectors, as well as one index and two ETFs that capture the performance of small, mid, and large market capitalization stocks. The monthly performance of these variables are matched against the respective dates of federal funds rate data

The interaction of oxygen atoms with solid surfaces at eV energies Annual status report, 1 Jun. 1968 - 31 May 1969

Interaction of oxygen atoms with solid surfaces at eV energie

Windbreak Management to Reduce Overwintering Boll Weevil Habitat.

6 p

Windbreak Management to Reduce Overwintering Boll Weevil Habitat.

6 p

Hydro-Aeroponic Design

“Aeroponics” is a plant cultivation technique where roots hang suspended in the air while the nutrient solution is delivered in the form of a fine mist. NASA has done experiments in space and found out that plants grow very well with aeroponic technology. However, “Hydroponics” is the most preferred method, where plants are grown in a non-soil medium, and mostly in nutrient liquid that flows through rectangular channels. There are advantages and disadvantages to each system. With the intention of combining the efficiency of aeroponics and the compactness of hydroponics, a hydro-aeroponic system was created to grow spinach and lettuce. This design utilized a misting box and recirculating fan to drive humid, nutrient-laden mist through a series of channels. Several setbacks resulted in many iterations of misting boxes, fans, and component arrangements which ultimately led to a proof of concept design. The proof of concept design was implemented and tested for several weeks with a variety of plants and showed varying degrees of success. Several design improvements were proposed to enhance the system however, due to the restrictions with time and budget, the decision was made to continue with the current design

Seeing motion and apparent motion

In apparent motion experiments, participants are presented with what is in fact a succession of two brief stationary stimuli at two different locations, but they report an impression of movement. Philosophers have recently debated whether apparent motion provides evidence in favour of a particular account of the nature of temporal experience. I argue that the existing discussion in this area is premised on a mistaken view of the phenomenology of apparent motion and, as a result, the space of possible philosophical positions has not yet been fully explored. In particular, I argue that the existence of apparent motion is compatible with an account of the nature of temporal experience that involves a version of direct realism. In doing so, I also argue against two other claims often made about apparent motion, viz. that apparent motion is the psychological phenomenon that underlies motion experience in the cinema, and that apparent motion is subjectively indistinguishable from real motion

A Full-Potential-Linearized-Augmented-Plane-Wave Electronic Structure Study of delta-Plutonium and the (001) Surface

The electronic and geometric properties of bulk fcc delta-plutonium and the quantum size effects in the surface energies and the work functions of the (001) ultra thin films (UTF) up to 7 layers have been investigated with periodic density functional theory calculations within the full-potential linearized augmented-plane wave (FP-LAPW) approach as implemented in the WIEN2k package. Our calculated equilibrium atomic volume of 178.3 a.u.^3 and bulk modulus of 24.9 GPa at the fully relativistic level of theory, i.e. spin-polarization and spin-orbit coupling included, are in good agreement with the experimental values of 168.2 a.u.^3 and 25 GPa (593 K), respectively. The calculated equilibrium lattice constants at different levels of approximation are used in the surface properties calculations for the thin films. The surface energy is found to be rapidly converged with the semi-infinite surface energy predicted to be 0.692eV at the fully-relativistic level.Comment: 27 pages,8 figure