Quantum spatial propagation of squeezed light in a degenerate parametric amplifier

Differential equations which describe the steady state spatial evolution of nonclassical light are established using standard quantum field theoretic techniques. A Schroedinger equation for the state vector of the optical field is derived using the quantum analog of the slowly varying envelope approximation (SVEA). The steady state solutions are those that satisfy the time independent Schroedinger equation. The resulting eigenvalue problem then leads to the spatial propagation equations. For the degenerate parametric amplifier this method shows that the squeezing parameter obey nonlinear differential equations coupled by the amplifier gain and phase mismatch. The solution to these differential equations is equivalent to one obtained from the classical three wave mixing steady state solution to the parametric amplifier with a nondepleted pump

Venture Capital Contracting and Syndication: An Experiment in Computational Corporate Finance

This paper develops a model to study how entrepreneurs and venture-capital investors deal with moral hazard, effort provision, asymmetric information and hold-up problems. We explore several financing scenarios, including first-best, monopolistic, syndicated and fully competitive financing. We solve numerically for the entrepreneur's effort, the terms of financing, the venture capitalist's investment decision and NPV. We find significant value losses due to holdup problems and under-provision of effort that can outweigh the benefits of staged financing and investment. We show that a commitment to later-stage syndicate financing increases effort and NPV and preserves the option value of staged investment. This commitment benefits initial venture capital investors as well as the entrepreneur.

Preliminary evaluation of a thin organic film coating Final report

High temperature and humidity resistance of thin siloxane films on metal substrate

Rough-water Landings of a 0.1-Size Powered Dynamic Model of the XP5Y-1 Flying Boat with Two Types of Afterbody - Langley Tank Model 228 (TED No. NACA DE309)

A 0.1-size powered dynamic model of a large, high-speed flying boat was landed in Langley tank no. 1 into oncoming waves 4 feet high (full size). The model was tested with two afterbodies of differing lengths (4.12 and 6.63 beams). The short afterbody had a constant angle of dead rise of 22.5deg and a keel angle of 6.5deg. The long afterbody had warped dead rise and a keel angle of 8.5deg. The vertical accelerations were slightly greater and the maximum angular accelerations and maxim= trims were slightly less for the model with the long afterbody than for the model with -the short afterbody. A wave length of 210 feet (full size) imposed the highest accelerations on the model with either the long or the short afterbody

Analysis of on-orbit thermal characteristics of the 15-meter hoop/column antenna

In recent years, interest in large deployable space antennae has led to the development of the 15 meter hoop/column antenna. The thermal environment the antenna is expected to experience during orbit is examined and the temperature distributions leading to reflector surface distortion errors are determined. Two flight orientations corresponding to: (1) normal operation, and (2) use in a Shuttle-attached flight experiment are examined. A reduced element model was used to determine element temperatures at 16 orbit points for both flight orientations. The temperature ranged from a minimum of 188 K to a maximum of 326 K. Based on the element temperatures, orbit position leading to possible worst case surface distortions were determined, and the subsequent temperatures were used in a static finite element analysis to quantify surface control cord deflections. The predicted changes in the control cord lengths were in the submillimeter ranges

Pollen Stratigraphy and Age of an Early Postglacial Beaver Site Near Columbus, Ohio

Author Institution: Department of Botany and Bacteriology, Ohio Wesleyan UniversityA former bog, buried under urban debris, was exposed during foundation excavation at Refugee Road, southeast Columbus, Ohio. Pollen samples were collected at two-inch intervals from 2 to 7 1/2 feet below the present surface. The uppermost 3 feet of peat, overlying 2 1/2 feet of detritus gyttja, contained numerous pieces of spruce (Picea), willow (Salix), and juniper (Juniperus). Many pieces showed beaver toothmarks and were presumably a part of a beaver dam or lodge. Because of their small width, the beaver toothmarks are interpreted as representing those of the common beaver, Castor canadensis. Pollen analyses indicate that beaver occupied the site more than 12,000 years ago, and that the site was abandoned prior to the increase in oak and other hardwood pollen which marks the beginning of the hypsithermal interval