A method for using surface tension to determine the size of holes in hardware

To check the size of small holes in injectors, flow control orifices, filters, and similar hardware, a surface tension technique is used. The liquid surface tension causes it to act as a membrane when pressure is applied. This bubble pressure is a function of hole diameter and surface tension

Development of vibration design procedures for representative structural types Final technical report, Sep. 1965 - Jul. 1966

Effects of multimode and damping on random fatigue of cantilever beams and bracket

Quantum entanglement and fixed-point bifurcations

How does the classical phase space structure for a composite system relate to the entanglement characteristics of the corresponding quantum system? We demonstrate how the entanglement in nonlinear bipartite systems can be associated with a fixed point bifurcation in the classical dynamics. Using the example of coupled giant spins we show that when a fixed point undergoes a supercritical pitchfork bifurcation, the corresponding quantum state - the ground state - achieves its maximum amount of entanglement near the critical point. We conjecture that this will be a generic feature of systems whose classical limit exhibits such a bifurcation.Comment: v2: Structure of the paper changed for clarity, reduced length, now 9 pages with 6 figure

Tax Reform, Investment, and the Value of the Firm

The taxation of corporate assets is well understood to influence investment and firm valuation. This paper explores the consequences of postwar U.S. tax changes in a dynamic model which incorporates costs of adjustment and investor expectations of future tax reforms and macroeconomic variability.When viewed in a dynamic context, the tax code can have very different incentives than those implied by the usual static analysis. Simulation results suggest that investment is sensitive to future tax changes and business-cycle movements. The paper also illustrates the implications of this analysis for the design of tax reforms.

Perfect Taxation with Imperfect Competition

This paper analyzes features of perfect taxation also known as optimal taxation when one or more private markets is imperfectly competitive. Governments with perfect information and access to lump-sum taxes can provide corrective subsidies that render outcomes efficient in the presence of imperfect competition. Relaxing either of these two conditions removes the government's ability to support efficient resource allocation and changes the perfect policy response. When governments cannot use lump-sum taxes, perfect tax policies represent compromises between the benefits of subsidizing output in the imperfectly competitive sectors of the economy and the costs of imposing higher taxes elsewhere. This tradeoff is formally identical for ad valorem and specific taxes, even though ad valorem taxation is welfare superior to specific taxation in the presence of imperfect competition. When governments have uncertain knowledge of the degree of competition in product markets, perfect corrective tax policy is generally of smaller magnitude than that when the degree of competition is known with certainty.

Engine technology challenges for a 21st Century High-Speed Civil Transport

Ongoing NASA-funded studies by Boeing, McDonnell-Douglas, General Electric, and Pratt & Whitney indicate that an opportunity exists for a 21st Century High-Speed Civil Transport (HSCT) to become a major part of the international air transportation system. However, before industry will consider an HSCT product launch and an investment estimated to be over $15 billion for design and certification, major technology advances must be made. An overview of the propulsion-specific technology advances that must be in hand before an HSCT product launch could be considered is presented