Electro-expulsive separation system

An electro-expulsive system has one or more overlapped conductors, each comprising a flexible ribbon conductor, which is folded back on itself. The conductors are embedded in an elastomeric material. Large current pulses are fed to the conductors from power storage units. As a result of the antiparallel currents, the opposed segments of a conductor are forcefully separated and the elastomeric material is distended. Voids in the elastomer aid the separation of the conductor segments. The distention is almost instantaneous when a current pulse reaches the conductor and the distention tends to remove any solid body on the surface of the elastomeric material

Controlled vortical flow on delta wings through unsteady leading edge blowing

The vortical flow over a delta wing contributes an important part of the lift - the so called nonlinear lift. Controlling this vortical flow with its favorable influence would enhance aircraft maneuverability at high angle of attack. Several previous studies have shown that control of the vortical flow field is possible through the use of blowing jets. The present experimental research studies vortical flow control by applying a new blowing scheme to the rounded leading edge of a delta wing; this blowing scheme is called Tangential Leading Edge Blowing (TLEB). Vortical flow response both to steady blowing and to unsteady blowing is investigated. It is found that TLEB can redevelop stable, strong vortices even in the post-stall angle of attack regime. Analysis of the steady data shows that the effect of leading edge blowing can be interpreted as an effective change in angle of attack. The examination of the fundamental time scales for vortical flow re-organization after the application of blowing for different initial states of the flow field is studied. Different time scales for flow re-organization are shown to depend upon the effective angle of attack. A faster response time can be achieved at angles of attack beyond stall by a suitable choice of the initial blowing momentum strength. Consequently, TLEB shows the potential of controlling the vortical flow over a wide range of angles of attack; i.e., in both for pre-stall and post-stall conditions

Partial Privatization, Foreign Competition, and Tariffs Ranking

This paper compares the optimal tariff and revenue maximizing tariffs in the presence of partial privatization. We show that in an international mixed oligopoly with asymmetric costs and partial privatization, when the marginal cost of the privatized firm exceeds a critical value, maximum -revenue tariff is higher than optimum-welfare tariff. Otherwise, optimum-welfare tariff is higher than maximum-revenue tariff. In addition, associating with the market-opening policy, the domestic government should accelerate privatization path and impose a lower welfare-optimum tariff rate.mixed oligopoly, partial privatization, tariff ranking

Self-adaptive node-based PCA encodings

In this paper we propose an algorithm, Simple Hebbian PCA, and prove that it is able to calculate the principal component analysis (PCA) in a distributed fashion across nodes. It simplifies existing network structures by removing intralayer weights, essentially cutting the number of weights that need to be trained in half

A Columnist\u27s View of Capitol Square: Ohio Politics and Government, 1969-2005

This carefully-selected collection brings together his columns about the major figures, seminal events, and legends from 1969 through 2005. Leonard, the man with no agenda but the truth, covers campaigns and national political conventions, including the famous Democratic primary battles between John Glenn and Howard Metzenbaum in the 1970s. Fully described is the era of the four-term Governor James A. Rhodes, who controlled the Ohio Republican Party for two decades. Among the cast of characters are colorful lobbyist, Tom Dudgeon, who described the legislative process as “The Dance of the Stomping Buzzards,” state Senator Oakley Collins, a southern Ohioan who campaigned so enthusiastically that he “could dive into the Ohio River and shake three hands before he surfaced,” and Senator Tony Calabrese, a former nightclub bouncer from Cleveland, who told a nervous lobbyist: “Don’t worry. Once I’m bought, I stay bought.” No one—I mean no one—knows more about the inner workings of Ohio politics than Lee Leonard. With clear vision and steadfast integrity he clears the political underbrush so that his readers get a real understanding of how their tax dollars are spent—and misspent. —U.S. Senator Sherrod Brown (D-OH) Lee Leonard is that rare observer—one with a real understanding and appreciation of the very imperfect people, processes, and politics that somehow makes the system work, in Columbus and in other state capitals as well. No journalist has covered the Statehouse as long and as faithfully as Leonard. His columns provide the best of reads for reviewing almost four decades of politics in Ohio; they reflect his discerning eye and critical judgment. —Alan Rosenthal, Professor of Public Policy, Rutgers University For those who follow Ohio politics—either closely or casually—Lee Leonard’s delightful collection of a lifetime of columns on the topic is an invaluable addition to understanding of this fascinating topic. —Alexander P. Lamis, Case Western Reserve University, editor of Ohio Politicshttps://ideaexchange.uakron.edu/uapress_publications/1127/thumbnail.jp

Competing roughening mechanisms in strained heteroepitaxy: a fast kinetic Monte Carlo study

We study the morphological evolution of strained heteroepitaxial films using kinetic Monte Carlo simulations in two dimensions. A novel Green's function approach, analogous to boundary integral methods, is used to calculate elastic energies efficiently. We observe island formation at low lattice misfit and high temperature that is consistent with the Asaro-Tiller-Grinfeld instability theory. At high misfit and low temperature, islands or pits form according to the nucleation theory of Tersoff and LeGoues.Comment: 4 pages, 4 figures, ReVTe

Synthesis and Characterization of Diamond-like Carbon Thin Films for Biomedical Applications

Diamond-like carbon (DLC) thin films were produced by pulsed laser deposition (PLD) on silicon, fused silica, and silicon nitride substrates. The films produced were either undoped, made using a pure graphite target, or doped, using multi-component targets made from a combination of graphite and silicon, silicon nitride, titanium dioxide, or silicon monoxide. These films were evaluated for their potential use in biomedical applications, including coatings for artificial joints, heart stents, and bronchoscopes. The films were characterized by Raman spectroscopy, atomic force microscopy, ball-on-flat tribometry, contact angle measurements, and spectrophotometry. Film thickness was determined by optical profilometry. Film adhesion was checked by soaking the films in simulated body fluid (SBF) and monitoring the quality of the film surface at varying time intervals using an optical microscope. DLC coatings were produced with a root mean square surface roughness of less than 1 nm and a 0.08 lubricated coefficient of friction. Contact angles of water on the undoped films varied with deposition conditions, ranging from 65 to 88 degrees. Contact angles as low as 25 degrees were achieved by incorporating silicon monoxide dopant. DLC coatings were produced on fused silica having high transparency and showing no delamination after forty-three weeks of immersion in SBF. These results indicate that these films have potential as biomedical coatings