Award Data

N/A

N/A

SPECKLE PHENOMENA ARE A FIRST ORDER CONSIDERATION AND QUITE OFTEN ARE THE DOMINATING FACTOR IN DETERMINING THE SPECIFIC PERFORMANCE OF A COHERENT OPTICAL LIDAR. THIS EXPERIMENTAL PROGRAM IS DIRECTED TOWARD CHARACTERIZING A COHERENT ARRAY RECEIVER FROM THE SPECIFIC VIEWPOINT OF DEVELOPING A "SMART"PROCESSOR WHICH CAN ADAPTIVELY SUM, IN A NON-LINEAR FASHION,THE OUTPUTS FROMTHE HETERODYNING ARRAY TO ...

N/A

THIS IS AN ANALYTICAL STUDY OF THE VISCOUS THREE DIMENSIONAL UNSTEADY FLOW FIELD OVER AIRFOIL SECTIONS. THE LONG TERM GOAL OF THE EFORT IS DEVELOPMENT OF AN ANALYSIS THAT CAN BE APPLIED TO PREDICTING THE FLOW FIELD OVER AIRFOILS IN GENERAL AND ON HELICOPTER ROTORS IN PARTICULAR. ALTHOUGH A COMPLETE ANALYSIS IS THE LONG TERM GOAL, THE PRESENT STUDY FOCUSES UPON THE FIRST PHASE WHICH CONSIDERS THE F ...

THIS PROJECT FORMULATES, TESTS AND EVALUATES NEW TECHNIQUES FOR IMPROVING THE ACCURACY AND EFFICIENCY OF IMPLICIT FINITE-DIFFERENCE ALGORITHMS FOR THE THREE DIMENSIONAL COMPRESSIBLE NAVIER-STOKES EQUATIONS. THE TECHNIQUES SHOULD, IF SUCESSFUL, REDUCE THE ERRORS DUE TO ADDED ARTIFICIAL DISSIPATION AND WOULD PROVIDE FOR SYSTEMATIC SELECTION OF TIME STEPS TO ACCELERATE CONVERGENCE TO STEADY SOLUTIONS ...

IMPROVEMENTS RESULTING FROM A COMBINATION OF TWO ADVANCED NONDESTRUCTIVE EVALUATION (NDE) TECHNIQUES. THSES ARE: 1) ACOUSTIC HOLOGRAPHIC IMAGING, AND 2) DIGITAL SIGNAL PROCESSING USING ADAPTIVE LEARNING NETWORKS (ALN'S). EACH THESE TECHNIQUES SHOW DRAMATIC IMPROVEMENTS IN FLAW ASSESMENT OVER THAT AVAILABLE FROM CONVENTIONAL NDE TECHNIQUES. A SUCCESSFUL UNION OF THE TWO PROVIDES AN EXTREMELY POWERF ...

REALIZATION OF THE PERFORMANCE ADVANTAGES OF SUPERCONDUCTING DEVICES IN HIGH FREQUENCY COMMUNICATIONS DEPENDS ON DEVELOPMENT OF A LOW TEMPERATURE DEPOSITION PROCESS WITH EXACTING CONTROL OF STOICHIOMETRY AND MORPHOLOGY. MOCVD CAN MEET THESE NEEDS COUPLED WITH EASE OFSCALE-UP. HOWEVER, RECENT WORK AT ADVANCED TECHNOLOGY MATERIALS, INC. SHOWS THAT YBACUO AND BISRCACUO FILMS GROWN BY MOCVD AT TEMPERA ...

PROJECT OBJECTIVES ARE ADVANCING THE FABRICATION AND DESIGN TECHNOLOGY OF IR DETECTORS FROM BULK HGCDTE TO THE EMERGING TECHNOLOGY OF THIN FILMS; MAKING PROGRESS TOWARD FILMS ON SILICON WAFERS; AND IMPLEMENTING THE TECHNIQUE OF PULSED LASER DEPOSITION (PLD) FOR THE FABRICATION OF THESE HETEROEPITAXIAL-COMPOUND, SEMICONDUCTOR IR DETECTORS. PRESENT METHODS OF MATERIAL GROWTH, FROM BULK PROCESSES TO ...

SEVERAL AEROSPACE VECHICLES ARE CURRENTLY BEING CONSIDERED THAT HAVE A SIGNIFICANT PORTION OF THEIR FLIGHT PATH IN THE UPPER REACHES OF THE ATMOSPHERE. THE FLOW ABOUT THESE VEHICLES IS IN THE CONTINUUM-TRANSITION REGIME WHERE THE STANDARD EQUATIONS OF CONTINUUM FLOW, THE NAVIER-STOKES EQUATIONS, BEGIN TO FALL. THIS PROJECT WILL MODIFY THE HANA CODE, AN EXISTING NAVIER-STOKES CODE FOR THE ANALYSIS ...