Now showing items 21-40 of 63

    • Dipole-dipole interactions of charged magnetic grains 

      Perry, Jonathan; Matthews, Lorin; Hyde, Truell (IEEE, 2010-04)
      The interaction between dust grains is an important process in fields as diverse as planetesimal formation or the plasma processing of silicon wafers into computer chips. This interaction depends in large part on the ...
    • Vibrational Modes and Instabilities of a Dust Particle Pair in a Complex Plasma 

      Qiao, Ke; Matthews, Lorin; Hyde, Truell (IEEE Transactions on Plasma Science, 2010-04-10)
      Vibrational modes and instabilities of a dust-particle pair in a terrestrial aboratory complex plasma are investigated by employing an analytical method whereby the plasma wakefield induced by an external electric field ...
    • Fluid modeling of void closure in microgravity noble gas complex plasmas 

      Land, Victor; Matthews, Lorin; Hyde, Truell; Bolser, Diana (Physics Review E, 2010-05-12)
      A self-consistent dusty plasma fluid model has been extended to incorporate all the noble gases as the carrier gas. An analysis of void closure in complex plasma composed of these gases over a wide range of experimental ...
    • Note on a NAHE Variation 

      Greenwald, Jared; Pechan, Kristen; Renner, Tim; Ali, Tibra; Cleaver, Gerald (2010-07-09)
      We present a variation of the NAHE-basis for free fermionic heterotic string mod- els. By rotating some of boundary conditions of the NAHE periodic/anti-periodic fermions {ym, ym, wm, wm,}, for m = 1 to 6, associated with ...
    • A Simple Introduction to Particle Physics: Part II Geometric Foundations and Relativity 

      Robinson, Matthew; Ali, Tibra; Cleaver, Gerald (2010-07-09)
      This is the second in a series of papers intended to provide a basic overview of some of the major ideas in particle physics. Part I [40] was primarily an algebraic exposition of gauge theories. We developed the group ...
    • Branes in the M_D x M_d+ x M_d- Compactification of Type II String on S^1/Z_2 and Their Cosmologicval Applications 

      Devin, Michael; Ali, Tibra; Cleaver, Gerald; Wang, Anzhong; Wu, Qiang (2010-07-09)
      In this paper, we study the implementation of brane worlds in type II string theory. Starting with the NS/NS sector of type II string, we first compactify the (D + d+ + d−)-dimensional spacetime, and reduce the corresponding ...
    • Crystallization Dynamics of a Single Layer Complex Plasma 

      Hartmann, Peter; Douglass, Angela; Carmona-Reyes, Jorge; Matthews, Lorin; Hyde, Truell; Kovacs, Aniko; Donko, Zoltan (Physical Review Letters, 2010-09)
      We report a series of complex (dusty) plasma experiments, aimed at the study of the detailed time evolution of the recrystallization process following a rapid quench of a two-dimensional dust liquid. The experiments were ...
    • Simple method to measure the interaction potential of dielectric grains in a dusty plasma 

      Zhang, Zhuanhao; Qiao, Ke; Kong, Jie; Matthews, Lorin; Hyde, Truell (Physics Review E, 2010-09)
      A simple minimally perturbative method is introduced which provides the ability to experimentally measure both the radial confining potential and the interaction potential between two individual dust particles, levitated ...
    • The effect of dust charge variation, due to ion flow and electron depletion, on dust levitation 

      Land, Victor; Douglass, Angela; Qiao, Ke; Matthews, Lorin; Hyd, Truell (AIP Conference Proceedings, 2011)
      Using a fluid model, the plasma densities, electron temperature and ion Mach number in front of a powered electrode in different plasma discharges is computed. The dust charge is computed using OML theory for Maxwellian ...
    • Modeling Agglomeration of Dust Particles in Plasma 

      Matthews, Lorin; Land, Victor; Ma, Qianyu; Perry, Jonathan; Hyde, Truell (AIP Conference Proceedings, 2011)
      The charge on an aggregate immersed in a plasma environment distributes itself over the aggregate’s surface; this can be approximated theoretically by assuming a multipole distribution. The dipole-dipole (or higher order) ...
    • Agglomeration of Dust Particles in the Lab 

      Matthews, Lorin; Carmona-Reyes, Jorge; Land, Victor; Hyde, Truell (AIP Conference Proceedings, 2011)
      Dust aggregates are formed in a laboratory plasma as monodisperse spheres are accelerated in a self-excited dust density wave. The asymmetric charge on the aggregates causes them to rotate as they interact with the sheath ...
    • The effect of electrode heating on the discharge parameters in complex plasma experiments 

      Land, Victor; Carmona Reyes, Jorge; Creel, James; Schmoke, Jimmy; Cook, Mike; Matthews, Lorin; Hyde, Truell (IOP Publishing, 2011-01-25)
      Thermophoresis is a tool often applied in complex plasma experiments. One of the usual stated benefits over other experimental tools is that electrode temperature changes required to induce thermophoresis do not directly ...
    • One-dimensional vertical dust strings in a glass box 

      Kong, Jie; Hyde, Truell; Matthews, Lorin; Qiao, Ke; Zhang, Zhuanhao (Physical Review E, 2011-07-28)
      The oscillation spectrum of a one-dimensional vertical dust string formed inside a glass box on top of the lower electrode in a gaseous electronics conference (GEC) reference cell was studied. A mechanism for creating a ...
    • Dust particle charge in plasma with ion flow and electron depletion near plasma boundaries 

      Douglass, Angela; Land, Victor; Matthews, Lorin; Hyde, Truell (Physics of Plasmas, 2011-08-01)
      The charge on micrometer-sized dust particles suspended in plasma above the powered electrode of radio-frequency discharges is studied. Using a self-consistent fluid model, the plasma profiles above the electrode are ...
    • Charging and coagulation of dust in protoplanetary environments 

      Matthews, Lorin; Land, Victor; Hyde, Truell (Astrophysical Journal, 2012-01-01)
      Combining a particle–particle, particle–cluster, and cluster–cluster agglomerationmodel with an aggregate charging model, the coagulation and charging of dust particles in plasma environments relevant for protoplanetary ...
    • Determination of the levitation limits of dust particles within the sheath in complex plasma experiments 

      Douglass, Angela; Land, Victor; Qiao, Ke; Matthews, Lorin; Hyde, Truell (Physics of Plasmas, 2012-01-23)
      Experiments are performed in which dust particles are levitated at varying heights above the powered electrode in a radio frequency plasma discharge by changing the discharge power. The trajectories of particles dropped ...
    • The influence of monomer shape on aggregate morphologies 

      Perry, Jonathan; Gostomski, Erwin; Matthews, Lorin; Hyde, Truell (Astronomy & Astrophysics, 2012-03)
      Context. The coagulation of dust particles is the initial step in planetary formation, with the precursors to planetesimals believed to form via the collisions of micron and submicron sized dust particles in the disk ...
    • Effects of monomer shape on the formation of aggregates from a power law monomer distribution 

      Perry, Jonathan; Kimery, Jesse; Matthews, Lorin; Hyde, Truell (New Journal of Physcis, 2013)
      The coagulation of dust aggregates is an important process in many physical systems such as the Earth’s upper atmosphere, comet tails and protoplanetary discs. Numerical models which study the aggregation in these systems ...
    • Charging of aggregate grains in astrophysical environments 

      Ma, Qianyu; Matthews, Lorin; Land, Victor; Hyde, Truell (Astrophysical Journal, 2013-02-01)
      The charging of dust grains in astrophysical environments has been investigated with the assumption that these grains are homogeneous spheres. However, there is evidence which suggests that many grains in astrophysical ...
    • Mode Couplings and Conversions for Horizontal Dust Particle Pairs in Complex Plasmas 

      Qiao, Ke; Kong, Jie; Zhang, Zhuanhao; Matthews, Lorin; Hyde, Truell (IEEE Transactions on Plasma Science, 2013-04)
      The normal modes for horizontal dust particle pairs in a complex plasma are investigated using two methods, a numerical calculation and a molecular dynamics simulation. The ion wakefield downstream of each particle and the ...