10,337 research outputs found
Particle parameter analyzing system
An X-Y plotter circuit apparatus is described which displays an input pulse representing particle parameter information, that would ordinarily appear on the screen of an oscilloscope as a rectangular pulse, as a single dot positioned on the screen where the upper right hand corner of the input pulse would have appeared. If another event occurs, and it is desired to display this event, the apparatus is provided to replace the dot with a short horizontal line
A solid-state low-noise preamplifier
Solid state low noise preamplifier for particle detector of electrostatic accelerator syste
Oscilloscope used as X-Y plotter or two-dimensional analyzer
Oscilloscope used as an X-Y plotter or two-dimensional analyzer tags each point with a yes or no, depending on a third parameter. The usual square-wave pulse is replaced on the scope by a single information-bearing dot which lengthens to a dash in response to a simultaneous event
Aoyama Gakuin University, Japan
Poster created by students in the 2019 IWU Freeman Asia Internship Program
Immiscible two-phase flow in porous media: Effective rheology in the continuum limit
It is becoming increasingly clear that there is a regime in immiscible
two-phase flow in porous media where the flow rate depends of the pressure drop
as a power law with exponent different than one. This occurs when the capillary
forces and viscous forces both influence the flow. At higher flow rates, where
the viscous forces dominate, the flow rate depends linearly on the pressure
drop. The question we pose here is what happens to the linear regime when the
system size is increased. Based on analytical calculations using the capillary
fiber bundle model and on numerical simulations using a dynamical network
model, we find that the non-linear regime moves towards smaller and smaller
pressure gradients as the system size grows.Comment: 10 pages, 6 figure
Acid-base properties of carbon black surfaces
The surface properties of carbon blacks reflect not only Van der Waals forces due to carbon, but also chemical properties of groups formed on carbon black surfaces by reactions with environmental substances (e.g. water, oxygen, etc.). The present work constitutes a study of such groups
Flow-Area Relations in Immiscible Two-Phase Flow in Porous Media
We present a theoretical framework for immiscible incompressible two-phase
flow in homogeneous porous media that connects the distribution of local fluid
velocities to the average seepage velocities. By dividing the pore area along a
cross-section transversal to the average flow direction up into differential
areas associated with the local flow velocities, we construct a distribution
function that allows us not only to re-establish existing relationships between
the seepage velocities of the immiscible fluids, but also to find new relations
between their higher moments. We support and demonstrate the formalism through
numerical simulations using a dynamic pore-network model for immiscible
two-phase flow with two- and three-dimensional pore networks. Our numerical
results are in agreement with the theoretical considerations.Comment: 12 pages, 5 figure
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