John P. Koulakis
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View article: Compressed Ultrafast Photography of Plasmas Formed from Laser Breakdown of Dense Gases Reveals that Internal Processes Dominate Evolution at Early Times
Compressed Ultrafast Photography of Plasmas Formed from Laser Breakdown of Dense Gases Reveals that Internal Processes Dominate Evolution at Early Times Open
Compressed ultrafast photography (CUP) is applied to laser breakdown in argon and xenon under pressures up to 40atm to obtain 2D images of the plasma dynamics of single events with a spatial resolution of 250x100 pixels and an equivalent f…
View article: Tumescent Injections in Subcutaneous Pig Tissue Disperse Fluids Volumetrically and Maintain Elevated Local Concentrations of Additives for Several Hours, Suggesting a Treatment for Drug Resistant Wounds
Tumescent Injections in Subcutaneous Pig Tissue Disperse Fluids Volumetrically and Maintain Elevated Local Concentrations of Additives for Several Hours, Suggesting a Treatment for Drug Resistant Wounds Open
Purpose Bolus injection of fluid into subcutaneous tissue results in accumulation of fluid at the injection site. The fluid does not form a pool. Rather, the injection pressure forces the interstitial matrix to expand to accommodate the ex…
View article: Numerical Modeling of a Laboratory Star
Numerical Modeling of a Laboratory Star Open
The Sun’s 22-year magnetic cycle has critically influenced academic dialogue on the study of fluid mechanics and how convection plays a role in the dynamo process that occurs in stellar and planetary models. Exploration of the circulatory …
View article: Pycnoclinic acoustic force
Pycnoclinic acoustic force Open
The interaction of high amplitude sound with density gradients in the background gas through which the sound propagates gives rise to the pycnoclinic acoustic force (PAF). This force is a generalization of acoustic radiation pressure for n…
View article: Acousto-convective relaxation oscillation in plasma lamp
Acousto-convective relaxation oscillation in plasma lamp Open
Periodic instability in sulfur plasma bulbs driven at their acoustic resonant frequency leads to behavior similar to a relaxation oscillation. This instability, which develops over the course of more than 500 acoustic periods manifests as …
View article: Comment on “Fluid modeling of a high-voltage nanosecond pulsed xenon microdischarge” [Phys. Plasmas <b>23</b>, 073513 (2016)]
Comment on “Fluid modeling of a high-voltage nanosecond pulsed xenon microdischarge” [Phys. Plasmas <b>23</b>, 073513 (2016)] Open
Simulations of sparks in 10 atmosphere Xenon gas by Levko and Raja [Phys. Plasmas 23, 073513 (2016)] are unable to reproduce the experimental fact of their opacity to visible light [Bataller et al., Appl. Phys. Lett. 105, 223501 (2014)]. L…
View article: Construction and characterization of a frequency-controlled, picometer-resolution, displacement encoder-actuator
Construction and characterization of a frequency-controlled, picometer-resolution, displacement encoder-actuator Open
We have constructed an actuator/encoder whose generated displacement is controlled through the resonance frequency of a microwave cavity. A compact, 10-μm-range, digitally controlled actuator executing frequency-coded displacement with pic…
View article: Comment on “Early stage time evolution of a dense nanosecond microdischarge used in fast optical switching applications” [Phys. Plasmas <b>22</b>, 123518 (2015)]
Comment on “Early stage time evolution of a dense nanosecond microdischarge used in fast optical switching applications” [Phys. Plasmas <b>22</b>, 123518 (2015)] Open
In an effort to understand the opaque nature of high-voltage nanosecond microdischarges and their ability to block 532 nm nanosecond laser pulses, as demonstrated by Bataller et al. [Appl. Phys. Lett. 105, 223501 (2014)], Levko and Raja ha…