This proposal addresses the propagation, persistence, and fate of a vortex pair in a stratified, sheares e environment. in particular, we will study the evoluton of a solitary vortex which occurs when a vortex pair is imbedded in shear flow of proper magnitude. solitary waves have been observed to… More

Mines buried in the sea bottom are often impossible to detect acoustically. electromagnetic energy provides an alternative means of detection. an active system formed by a source current encircling a superconductive magnetic gradiometer holds the promise of providing an underwater-towed system for… More

We propose the application of a newly developed data processing technique to eeg time series. this technique will allow us to develop quantitative measures of brain activity associated with wakeful attentiveness. these measures are the fractal dimension and the information entropy both of which have… More

The performance of atmospheric samplers is crucial to the analyses and interpretation of disposal and reaction-rate trail data for cbw materials and obscurants. routine calibration of sensor/sampler is performed prior to deployment in support of field trials. presently sensor/samplers collection… More

A review of sensor technologies shows that electromagnetic energy at frequencies below 1 khz can provide a reliable means to detect, identify, and locate mines in shallow water. a pulsed electromagneticinstrument comprising a transmitter encircling a superconductive magnetic receiver promises to… More

The squid (superconducting quantum interference device) makes possible magnetic measurements of unequalled sensitivity. heretofore, practical squid systems have been cooled by liquid helium. the problem of reliably fabricating practical, low noise squids that operate in liquid nitrogen remains… More

We propose to develop a non-contacting electromagnetic system to measure residual stress in ferromagnetic armor plate. we use a superconductive (squid) magnetic gradiometer in a novel configuration as the sensor. it is combined with a magnetizing source consisting of a nested set of superconducting… More

A means is required to measure the clearance between the surface of a missile and its launch tube during a launch, to an accuracy of the order of 2%. the measurement must remain unperturbed by large fluctuations in environmental temperature, and in the density and electrical conductivity of the… More

We propose to initiate development of a high thermal conductivity printed circuit board (pcb) assembly. use of a heat pipe technique is expected to yield thermal conductivities many times that of copper or expensive ceramics. the principles of heat pipe operation are discussed, and a simple printed… More

Recently a new paradigm for the interpretation of irregular aperiodic times series has emerged, based on the dynamics of the lowdimensional nonlinear systems and distinguishes between "noise" as traditionally used in statistics and the notion of "chaos," which is randomness generated by… More

We propose to initiate development of three non-contacting superconductive electromagnetic systems for nondestructive test and evaluation applications. two systems use squid gradiometers and superconductive magnetizing coils. one is suited to testing flat metal metal foils, sheets, or plates. the… More

Potential flow around a moving body in a fluid produces displacement of isopycnal surfaces. at the free surface of the fluid, the displacement is known as the "bernoulli hump". tilt of the free surface can be measured in ice-covered seas where surface waves are heavily dampled. the bernoulli hump… More