A5002067531- Particle physics theoretical and experimental studies
- Hydrocarbon exploration and reservoir analysis
- Material Dynamics and Properties
- Petroleum Processing and Analysis
- Particle Accelerators and Free-Electron Lasers
- Quantum Chromodynamics and Particle Interactions
- Rheology and Fluid Dynamics Studies
- Particle accelerators and beam dynamics
- Fluid Dynamics and Mixing
- Pickering emulsions and particle stabilization
- Enhanced Oil Recovery Techniques
- Innovative Microfluidic and Catalytic Techniques Innovation
- nanoparticles nucleation surface interactions
- Hydraulic Fracturing and Reservoir Analysis
- Electrohydrodynamics and Fluid Dynamics
- Heat Transfer and Boiling Studies
- Liquid Crystal Research Advancements
- Microfluidic and Bio-sensing Technologies
- Crystallization and Solubility Studies
- Computational Geometry and Mesh Generation
- Sports Dynamics and Biomechanics
- Superconducting Materials and Applications
- Drilling and Well Engineering
- X-ray Diffraction in Crystallography
- Sports Performance and Training
Portland State University
2023
Santa Cruz County Office of Education
2023
Schlumberger (United States)
2008-2022
Schlumberger (British Virgin Islands)
2016-2021
University of Waterloo
2020-2021
Baker Hughes (United States)
2019
Manchester Metropolitan University
2018-2019
Northwestern University
2013-2015
University of New Hampshire
2013
Princeton University
2001-2008
Oil-water mixtures are ubiquitous in nature and particularly important biology industry. Usually additives used to prevent the liquid droplets from coalescing. Here, we show that stabilization can also be obtained electrostatics, because of well known remarkable properties water. Preferential ion uptake leads a tunable droplet charge surprisingly stable, additive-free, water-in-oil emulsions crystallize. For particle-stabilized ("Pickering") find even extremely hydrophobic, nonwetting...
Recent simulations indicate that ellipsoids can pack randomly more densely than spheres and, remarkably, for axes ratios near 1.25:1:0.8 approach the densest crystal packing (fcc) of spheres, with a fraction 74%. We demonstrate such dense packings are realizable. introduce novel way determining density finite sample minimizes surface effects. have fabricated and show that, in sphere, radial phi(r) be obtained from V(h), volume added fluid to fill sphere height h. also obtain magnetic...
Water-encapsulated microbubbles (gas-in-water-in-oil) are fabricated using two different microfluidic approaches. By adjusting the flow rate ratio of water to oil number encapsulated in micrometer-size droplets and thickness layer can be controlled. Adding photopolymerizable monomers into phase permits polymerization aqueous encapsulating yielding porous polymer microparticles. Supporting information for this article is available on WWW under...
We report a new measurement of the parity-violating asymmetry in elastic electron scattering from proton at backward angles. This is sensitive to strange magnetic form factor as well electroweak axial radiative corrections. The A = -4.92+/-0.61+/-0.73 ppm provides significant constraint on these quantities. implications for are discussed context theoretical estimates
We report the first measurement of vector analyzing power in inclusive transversely polarized elastic electron-proton scattering at Q2=0.1(GeV/c)2 and large angles. This quantity must vanish single virtual photon exchange, plane-wave impulse approximation for this reaction, can therefore provide information on two exchange amplitudes electromagnetic interactions with hadronic systems. The observable we have measured is driven by imaginary part amplitude, side which simply Compton amplitude...
Particle concentration is a dominant control parameter for colloids and other soft matter systems. We demonstrate simple technique, "dielectrophoretic equilibrium," implemented as an "electric bottle," planar capacitor in larger volume. The uniform field the traps particles this force-free region at higher density than zero regions outside. show how technique measures equation of state we initiate grow colloidal crystals. "Dielectrophoretic equilibria" enable study complete...
A model was developed for the analysis of steady and unsteady bubble generation frequencies in a microfluidic flow-focusing device. In both cases, frequency depends on downstream influence bubbles created by device, which provides source feedback. For steady-state bubbles, this feedback explains relationships among frequency, gas pressure liquid flow rate our experiments as well gives physical explanation previously observed relations. The role is also exploited to explain behaviour; we...
We have used a variety of different applied fields to control the density, growth, and structure colloidal crystals. Gravity exerts body force proportional buoyant mass in equilibrium produces height-dependent concentration profile. A similar can be obtained with electric on charged particles (electrophoresis), temperature gradient all particles, or an field uncharged (dielectrophoresis). The last is particularly interesting since its magnitude sign changed by tuning frequency. study these...
This work concerns the use of electric field gradients to manipulate local particle concentration in a hard-sphere-like suspension. Inside specially designed “electric bottle,” we observed our colloids collect regions lowest strength (“negative dielectrophoresis”). allows for larger and stronger dielectrophoretic forces than original bottle design, which was based on positive dielectrophoresis [M. T. Sullivan et al., Phys. Rev. Lett. 96, 015703 (2006)]. We used confocal scanning laser...
Abstract Hausmannite Mn 3 O 4 octahedral nanoparticles of 18.3±7.0 nm with (101) facets have been prepared by an oxygen‐mediated growth. The electrochemical properties the particles as pseudocapacitive cathode materials were characterized both in half‐cells and button‐cells. exhibited a high mass‐specific capacitance 261 F g −1 , which was calculated from cyclic voltammetry analyses, capacitive retention 78 % after 10 000 galvanostatic charge–discharge cycles. charge‐transfer mechanisms...
A series of trivalent lanthanide hydroxysulfates, Ln(OH)SO4, (Ln = Pr through Yb, except radioactive Pm) has been synthesized via hydrothermal methods from Ln2(SO4)3·8H2O by reaction with aqueous NaOH at 170 °C in Teflon lined Parr steel autoclaves, and were characterized single crystal X-ray diffraction FT-IR spectroscopy. Two types arrangements found the solid state. The lighter Pr−Nd, Sm−Gd) heavier lanthanide(III) hydroxysulfates (Tb−Yb) are each isostructural. Both structure exhibit...
This article discusses a microfluidic vibrating wire viscometer with an internal volume of few microliters. Accuracy order ±10% for viscosities ranging from 0.1 to 100 cP is demonstrated temperatures (10 °C-175 °C) and pressures (10-24,000 psi) suitable oilfield use by prior calibration in air toluene. Comparison between multiple data sets indicates that large fraction the discrepancy literature values systematic, indicating future refinements may be possible better interpretation....
Summary A technique to quickly determine the asphaltene onset pressure (AOP) of a crude oil from low-volume, nonequilibrium measurements is presented. The at which optical signature indicative aggregation first detected in recombined oils found decrease strongly with rate depressurization and can be well-described modified power law. This exploits this dependence uses two separate decompressions highly disparate rates AOP. Benchmarking was performed that were characterized conventional...
Spaced out: This paper investigates potassium-ion storage in vanadium pentoxide nanofibers (VNFs, K0.33 V2 O5 ) with a layered architecture. In situ XRD experiments reveal that the interplanar space of VNF expands/contracts upon extraction/insertion potassium ions during redox process.
We present a highly miniaturized sensor for performing accurate on-chip detection of gas equilibration (bubble point) pressures in liquids, which is manufactured using low-cost batch microelectromechanical system technology. The measurement liquids has diverse spectrum applications ranging from the oil industry, where bubble point crude important making informed decisions on production and exploration, to fisheries saturation needs be controlled ensure animal health. Oilfield measurements...
The tennis racket has developed since the origins of Lawn Tennis in 1870s. This study investigated how from 1874 to 2017, using measurements and material classifications for 525 samples. Racket covered geometric, inertial dynamic properties, number strings. Rackets predating 1970 were mainly wooden, typically characterised by head areas below 0.05 m2, masses over 350 g natural frequencies 120 Hz. 1970s made wood, metal fibre–polymer composites, with most postdating 1980 composites a larger...
We use atomistic nonequilibrium molecular dynamics simulations to demonstrate how specific ionic flux in peptide nanotubes can be regulated by tailoring the lumen chemistry through single amino acid substitutions. By varying size and polarity of functional group inserted into nanotube interior, we are able adjust Na+ over an order magnitude. Cl− is consistently denied passage. Bulky, nonpolar groups encourage interactions between backbone carbonyl groups, disrupting solvation shell slowing...
Tennis racket properties are of interest to sports engineers and designers as it allows them evaluate performance, review trends compare designs. This study explored mathematical models that correlated the mass moments inertia a tennis racket, both about an axis through butt longitudinal axis, using its dimensions, centre location. The were tested on 416 rackets, dating from 1874 2017. Results showed can be estimated within − 4 5% 11 12% measured values, respectively, proposed original...
The trajectory of a stream bubbles is measured in microfluidic pressure-driven flow. For Newtonian fluids with or without surfactants, viscoelastic the maintain stable positions equally spaced along channel center line. However, for surfactant, transverse instability observed, which has characteristics linear instability, whose growth rate increases speed results are shown to be consistent action shear-induced normal stresses fluid, where magnitude shear and so augmented by surfactants that...
Abstract Parent–child contact problems (PCCP) after separation and divorce are the focus of heated debate in academia popular media as to how best identify, assess respond children who resist or refuse time with a parent. Practitioners disagree about extent which parental alienation (PA) is valid widespread phenomenon versus legal strategy counter IPV child abuse allegations. This study sheds light on prevailing attitudes by surveying opinions beliefs 1049 interdisciplinary family law...
A vibrating wire viscometer formed from a tungsten with radius of about 0.125 mm has been used to measure the viscosity certified reference fluid S60 at temperatures between (273 and 373) K pressure 0.1 MPa where varies (0.0062 0.652) Pa s resonance quality factor Q lie (20.8 1.02). Our results differ values cited by supplier less than ± 3 % over whole range Q, T, p. We have also measured S20, η(293 K, MPa) ≈ 37 mPa·s, while stagnant pressures below 69 temperature (298 423) flowing S20...