A5005930753- Laser-induced spectroscopy and plasma
- Astro and Planetary Science
- Space Satellite Systems and Control
- Analytical chemistry methods development
- Mass Spectrometry Techniques and Applications
- Diamond and Carbon-based Materials Research
- NMR spectroscopy and applications
- Force Microscopy Techniques and Applications
- Digital Holography and Microscopy
- Pulsars and Gravitational Waves Research
- Advanced Optical Imaging Technologies
- Theoretical and Computational Physics
- Granular flow and fluidized beds
- Mechanical and Optical Resonators
- earthquake and tectonic studies
- Advanced Numerical Methods in Computational Mathematics
- High-pressure geophysics and materials
- Atomic and Molecular Physics
- Differential Equations and Numerical Methods
- Radio Astronomy Observations and Technology
- Laser Material Processing Techniques
- Advanced Vision and Imaging
- Minerals Flotation and Separation Techniques
- Metallurgical Processes and Thermodynamics
- Ocular and Laser Science Research
University of Maryland, College Park
2018-2021
California State University, Fresno
2021
College of Western Idaho
2012
Honeywell (United States)
2011
Los Alamos National Laboratory
1999-2000
Experimental properties of a new form creep dynamics are reported, as manifest in variety sandstones, limestone, and concrete. The is recovery behavior, following the sharp drop elastic modulus induced either by nonlinear acoustic straining or rapid temperature change. extent universally proportional to logarithm time after source discontinuation all samples studied, over scaling regime covering at least 10(3) s. Comparison acoustically thermally suggests single origin based on internal...
Nanobubble coalescence is a process of great importance to broad range applications such as froth flotation fine or ultrafine mineral particles, detergent-free cleaning clothes, and de-inking recycled papers. To investigate the differences between nanobubble macrobubble coalescence, we use molecular dynamics simulations theoretical analysis study characteristics bulk nanobubbles in water. We provide quantitative evidence showing universally deviate from macroscopic bubble theories due small...
We describe a new space gravitational wave observatory design called LAGRANGE that maintains all important LISA science at about half the cost and with reduced technical risk. It consists of three drag-free spacecraft in most stable geocentric formation, Earth-Moon L3, L4, L5 Lagrange points. Fixed antennas allow continuous contact Earth, solving problem communications bandwidth latency. A 70 mm diameter AuPt sphere 35 gap to its enclosure serves as single inertial reference per spacecraft,...
Reducing the future threat of orbital debris will require active removal larger objects, such as old satellites and upper stages. Material ablation by intense laser radiation, which can be applied to most materials, provides a unique means solving this problem. Such allow tug use inert mass itself propellant for deorbit process, greatly reducing launched orbit. It further zero rotation from distance several meters, risk associated with docking. This paper looks at some basic performance...
A series of flight experiments have demonstrated a novel approach to measuring path-resolved optical turbulence quantities, such as , along an air-to-ground slant path. This paper describes the data acquisition that involved two laser beams propagating between orbiting airborne platform and stationary ground terminal over 8 km Ground-based in-flight measurements were collected simultaneously, profiles computed using difference differential-tilt variance (DDTV) technique. DDTV technique...
Purpose The purpose of this paper is to present the analytical solution Hermite collocation discretization a quadratically forced steady‐state convection‐diffusion equation in one spatial dimension with constant coefficients, defined on uniform mesh, Dirichlet boundary conditions. To improve accuracy method “upstream weighting” convective term used an optimal way. authors also provide determine where forcing function should be optimally sampled. Computational examples are given, which...
Pulsed laser ablation experiments on pyroxene rock have been conducted. A 1064nm with a 0.7ns pulse width is used to generate in vacuum. The resulting plasma plume characterized time-of-flight mass spectrometer. Pyroxene mineral commonly found S-Type asteroids. Laser generates thrust, and can be move an asteroid off of Earth impacting trajectory, or more favorable orbit for in-situ resource utilization. In addition, spectrometry analysis From the data collected this experiment,...
The first Tracking and Data Relay Satellite (TDRS-1) was deactivated on June 27 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">th</sup> 2010 following more than 26 years of operation. end-of-mission (EOM) operations were developed to address the stringent requirements NPR 8715.6: NASA Procedural Requirements for Limiting Orbital Debris, which consists three key items: 1) removal from geosynchronous arc; 2) depletion remaining propellant; 3)...
Traditional computer vision (CV) approaches are the norm when attempting to extract edge information from an imaged object. These discrete almost always performed on 2D intensity imagery and at times can be computationally expensive depending algorithm. Digital holography (DH) provides access 3D object information. By manipulation of Fourier transform hologram, which is also needed for isolating real or virtual image in off-axis DH, extracted by high pass spatial filtering pertinent cropped...
Longitudinal resonance experiments on thin bars of sandstone reveal that their nonlinear behavior is richly diverse; they exhibit mesoscopic elasticity. Resonance show that, as a function increasing drive level, frequencies shift downward, curve-shape changes, and harmonics slow dynamics appear. Slow [Geophys Res. Lett. 23, 3019–3022 (1996)] refers to the following: large strain applied rock (‘‘conditioning’’) reduces its modulus (i.e., it behaves like softer spring); if for several minutes,...
A new form of nonlinear elastic response, which we call ‘‘slow dynamics,’’ has recently been found to scale universally in all sandstones, limestone, and concretes have tested. Slow dynamics is unique among known creep processes; the modulus inverse loss tangent drop response harmonic acoustic stress, so violates symmetry source. We show here that slow dynamic recovery rate a function temperature, consistent with thermal activation model for requiring spectrum energy barriers. also...