A5082166356- Combustion and flame dynamics
- Spectroscopy Techniques in Biomedical and Chemical Research
- Spectroscopy and Laser Applications
- Polynomial and algebraic computation
- Fluid Dynamics and Turbulent Flows
- Magnetic properties of thin films
- Advanced Combustion Engine Technologies
- Laser-induced spectroscopy and plasma
- Numerical Methods and Algorithms
- Particle Dynamics in Fluid Flows
- Spectroscopy and Chemometric Analyses
- Combustion and Detonation Processes
- Mathematics and Applications
- Computability, Logic, AI Algorithms
- Laser Design and Applications
- Energetic Materials and Combustion
- Gas Dynamics and Kinetic Theory
- Diverse Musicological Studies
- Fire dynamics and safety research
- Matrix Theory and Algorithms
- Magnetic Properties and Applications
- Advanced Algebra and Logic
- Advanced Optical Sensing Technologies
- Aerodynamics and Acoustics in Jet Flows
- Photoacoustic and Ultrasonic Imaging
Sandia National Laboratories
2018-2025
Georgia Tech Research Institute
2023
United States Military Academy
2023
Georgia Institute of Technology
2023
Sandia National Laboratories California
2017-2022
UNC Lineberger Comprehensive Cancer Center
2022
Colorado State University
2014-2019
Spectral Energies (United States)
2016-2018
University of Virginia
2018
United States Air Force Research Laboratory
2014-2015
Let S be n dimensional Euclidean space and let T a division of into cells. Assume that each cell must either white or black at any time t . At 0 the origin, α , is all other cells are white. G some stochastic growth process which tends to change with neighbours C(t) shape For family, F such processes we prove following theorem.
Let E be a set of expressions representing real, single valued, partially defined functions one real variable. * will the represented by in . If A is an expression , A(x) function denoted It assumed that E* contains identity and rational numbers as constant closed under addition, subtraction, multiplication composition.
As an in-plane charge current flows in a heavy metal film with spin-orbit coupling, it produces torque on and thereby switches the magnetization neighbouring ferromagnetic film. Such (SOT)-induced switching has been studied extensively recent years shown higher efficiency than using conventional spin-transfer torque. Here we report SOT-assisted metal/magnetic insulator systems. The experiments used Pt/BaFe12O19 bilayer where BaFe12O19 layer exhibits perpendicular magnetic anisotropy. is...
The detonation propagating through the annular channel of an optically accessible nonpremixed rotating engine (RDE) is visualized in this work using OH* chemiluminescence imaging. fuel and air are injected from separate streams partially premix front wave. images allow observation size shape structure, trailing edge oblique shock wave, possible presence deflagration between fill region expansion containing detonated products. useful for evaluating effects mass flow rate, equivalence ratio,...
Single-laser-shot temperature measurements at a data rate of 1 kHz employing femtosecond coherent anti-Stokes Raman scattering (fs-CARS) spectroscopy N(2) are demonstrated. The performed using chirped-probe pulse to map the time-dependent frequency-spread dephasing coherence, which is created by approximately 80-fs pump and Stokes beams, into spectrum signal pulse. Temperature determined from spectral shape fs-CARS for probe delays 2 ps with respect pump-Stokes excitation. accuracy precision...
The fuel and air mixing processes in an optically accessible non-premixed rotating detonation engine (RDE) are visualized using acetone planar laser induced fluorescence (PLIF) imaging. PLIF images used to observe the transient injection evaluate extent of partial premixing upstream wave. complement past OH* chemiluminescence which showed instantaneous size shape structure, oblique shock wave, possible presence deflagration between fuel-fill zone expansion region containing products. data...
Two-photon, planar laser-induced fluorescence (TP-PLIF) of carbon monoxide was performed in steady and driven flames using femtosecond (fs) laser pulses at 1 kHz. Excitation radiation 230.1 nm (full-width half-maximum bandwidth 270 cm-1) used to pump many rovibrational two-photon transitions the B1∑+←X1∑+ system. Visible range 362-516 captured an image intensifier high-speed camera. The signal dependence on excitation energy wavelength is presented. Photolytic interferences from ultraviolet...
A comparison is made between two ultrashort-pulse coherent anti-Stokes Raman scattering (CARS) thermometry techniques-hybrid femtosecond/picosecond (fs/ps) CARS and chirped-probe-pulse (CPP) fs-CARS-that have become standards for high-repetition-rate in the combustion diagnostics community. These variants of fs-CARS differ only characteristics ps-duration probe pulse; hybrid fs/ps a spectrally narrow, time-asymmetric pulse used, whereas highly chirped, broad used CPP fs-CARS. Temperature...
Femtosecond laser electronic excitation tagging (FLEET) velocimetry is an important diagnostic technique for seedless measurements particularly in supersonic and hypersonic flows. Typical FLEET feature a single line camera system to achieve one-component along line, although some multiple-spot multiple-component configurations have been demonstrated. In this work, tomographic imaging used track the three-dimensional location of many spots. A quadscope combine four unique views onto...
Light-induced generation of pure spin currents in a Pt(2.5 nm)/BaFe12O19(1.2 μm)/sapphire(0.5 mm) structure is reported. The BaFe12O19 film had strong in-plane uniaxial anisotropy and was therefore self-biased. Upon exposure to light, temperature difference (ΔT) established across the thickness that gave rise current Pt via Seebeck effect. Via inverse Hall effect, produced an electric voltage one lateral dimensions. varied with time same manner as ΔT flipped its sign when magnetization reversed.
We conducted 215 evaluations for plaque, stain, and calculus in 120 dogs at two research sites. Dogs were balanced groups of five according to baseline plaque index scores; randomly assigned treatment or control dietary regimens. Dental cleanings done on Day 0. the group fed a food formulated reduce accumulation calculus. Control commercially available dry dog food. No other foods, treats, snacks given either group. graded 22 teeth 7 stain 21. Six trials results reported as combined mean all...
The effects of broadband excitation employing femtosecond laser pulses on the coherent anti-Stokes Raman scattering (CARS) spectroscopy N2 are investigated. We have previously demonstrated that dephasing rate coherence, established by impulsive using pump and Stokes beams, can be used for measuring gas-phase temperature in chemically reacting flows. objective current work is to investigate polarization beating between CO measured time-resolved CARS N2.
Exact fractals of nonlinear waves that rely on strong dispersion and nonlinearity arise spontaneously out magnetic media were observed for the first time. The experiments make use a microwave to excite spin wave in quasi-one-dimensional magnonic crystal. When power input (Pin) is low, output signal has power-frequency spectrum consists single peak. Pin increased certain level, new side modes are generated through modulational instability (MI), resulting comb-like frequency spectrum. With...