Grease lubricated spiral groove gyro bearings Final report

Grease lubricated spiral groove bearings suitable for spin axis of gyros in automatic pilot

Credit Channel without the LM Curve

This paper extends Bernanke and Blinder (1988)'s macroeconomic model of credit channel to an environment where the monetary authority has control over a short-term interest rate. The comparative statics regarding changes in the market interest rate, in the required reserve ratio over bank deposits, and in the risk of public bonds are highlighted.

Research and development of high-performance axial-flow turbomachinery. Volume 3 - Design of backup gas bearings

Gas lubricated bearing system for turbine compresso

The Suppression and Recovery of the Ferroelectric Phase in Multiferroic MnWO4MnWO_4

We report the discovery of a complete suppression of ferroelectricity in $MnWO_4$ by 10 % iron substitution and its restoration in external magnetic fields. The spontaneous polarization in $Mn_{0.9}Fe_{0.1}WO_4$ arises below 12 K in external fields above 4 T. The magnetic/ferroelectric phase diagram is constructed from the anomalies of the dielectric constant, polarization, magnetization, and heat capacity. The observations are qualitatively described by a mean field model with competing interactions and strong anisotropy. We propose that the magnetic field induces a non-collinear inversion symmetry breaking magnetic structure in $Mn_{0.9}Fe_{0.1}WO_4$

Photoemission Spectroscopy of Magnetic and Non-magnetic Impurities on the Surface of the Bi2_2Se3_3 Topological Insulator

Dirac-like surface states on surfaces of topological insulators have a chiral spin structure that suppresses back-scattering and protects the coherence of these states in the presence of non-magnetic scatterers. In contrast, magnetic scatterers should open the back- scattering channel via the spin-flip processes and degrade the state's coherence. We present angle-resolved photoemission spectroscopy studies of the electronic structure and the scattering rates upon adsorption of various magnetic and non-magnetic impurities on the surface of Bi$_2$Se$_3$, a model topological insulator. We reveal a remarkable insensitivity of the topological surface state to both non-magnetic and magnetic impurities in the low impurity concentration regime. Scattering channels open up with the emergence of hexagonal warping in the high-doping regime, irrespective of the impurity's magnetic moment.Comment: 5 pages, 4 figure

ANALYSIS OF STRATEGY USED IN TAEKWONDO COMPETITION

The purpose of this study was to investigate the strategy used in the Taekwondo competition. A total of 21 matches, consisting of 1598 offensive and defensive events, were video taped. Competition strategy, based on frame-by-frame video analysis, was employed to classify the athlete’s motion. Offensive and defensive kicking technique, in order of priority, was roundhouse kick (72.7%), double roundhouse kick (11.0%), back kick (8.0%), cut down kick (3.3%), pushing kick (2.2%), spinning hook kick (1.9%), side kick (0.8%), and hook kick (0.2%). The methodology employed in this study and the data reported may be useful to coaches and athletes interested in gaining insight on the strategy of patterns used in Taekwondo competition