3,567 research outputs found
Review of Film Directing: Shot by Shot—25th Anniversary Edition: Visualizing from Concept to Screen
Review of Film Directing: Shot by Shot—25th Anniversary Edition: Visualizing from Concept to Screen
A 5 Meps $100 USB2.0 Address-Event Monitor-Sequencer Interface
This paper describes a high-speed USB2.0 Address-
Event Representation (AER) interface that allows simultaneous
monitoring and sequencing of precisely timed AER data. This
low-cost (<$100), two chip, bus powered interface can achieve
sustained AER event rates of 5 megaevents per second (Meps).
Several boards can be electrically synchronized, allowing simultaneous
synchronized capture from multiple devices. It has three
AER ports, one for sequencing, one for monitoring and one for
passing through the monitored events. This paper also describes
the host software infrastructure that makes the board usable for a
heterogeneous mixture of AER devices and that allows recording
and playback of recorded data
On testing the significance of a subset of coefficients in a set of seemingly unrelated regressions using mixed estimation
Photoemission of a doped Mott insulator: spectral weight transfer and qualitative Mott-Hubbard description
The spectral weight evolution of the low-dimensional Mott insulator TiOCl
upon alkali-metal dosing has been studied by photoelectron spectroscopy. We
observe a spectral weight transfer between the lower Hubbard band and an
additional peak upon electron-doping, in line with quantitative expectations in
the atomic limit for changing the number of singly and doubly occupied sites.
This observation is an unconditional hallmark of correlated bands and has not
been reported before. In contrast, the absence of a metallic quasiparticle peak
can be traced back to a simple one-particle effect.Comment: 4 pages, 4 figures, related theoretical work can be found in
arXiv:0905.1276; shortene
Spike-based control monitoring and analysis with Address Event Representation
Neuromorphic engineering tries to mimic biological
information processing. Address-Event Representation (AER) is
a neuromorphic communication protocol for spiking neurons
between different chips. We present a new way to drive robotic
platforms using spiking neurons. We have simulated spiking
control models for DC motors, and developed a mobile robot
(Eddie) controlled only by spikes. We apply AER to the robot
control, monitoring and measuring the spike activity inside the
robot. The mobile robot is controlled by the AER-Robot tool,
and the AER information is sent to a PC using the
USBAERmini2 interface.Junta de Andalucía P06-TIC-01417Ministerio de Educación y Ciencia TEC2006-11730-C03-0
Using Cost-Benefit Analysis for Fraternity and Sorority Affairs Assessment: Creating a Business Case for Student Success in Fraternal Organizations
Cost-benefit analysis can be an effective method for programmatic assessment, evaluation, and validation in fraternity/sorority affairs. This article provides an overview of a model cost-effectiveness assessment strategy outlined by Kennedy, Moran, and Upcraft (2001) and a cost-benefit study of the Rochester Institute of Technology fraternity/sorority program. Special attention is given to providing credible methods for fraternity/sorority professionals to measure programs using data related to organizational efficacy and student retention and applying that data to guide public perception. Recommendations for application on other campuses are provided in an effort to improve assessment practices and aid institutions in assessing the value of fraternal organizations
Large-eddy simulation of mesoscale dynamics and entrainment around a pocket of open cells observed in VOCALS-REx RF06
Large-eddy simulations of a pocket of open cells (POC) based on VOCALS Regional Experiment (REx) NSF C-130 Research Flight 06 are analyzed and compared with aircraft observations. A doubly-periodic domain 192 km × 24 km with 125 m horizontal and 5 m vertical grid spacing near the capping inversion is used. The POC is realized in the model as a fixed 96 km wide region of reduced cloud droplet number concentration (<i>N</i><sub>c</sub>) based on observed values; initialization and forcing are otherwise uniform across the domain. The model reproduces aircraft-observed differences in boundary-layer structure and precipitation organization between a well-mixed overcast region and a decoupled POC with open-cell precipitating cumuli, although the simulated cloud cover is too large in the POC. A sensitivity study in which <i>N</i><sub>c</sub> is allowed to advect following the turbulent flow gives nearly identical results over the 16 h length of the simulation (which starts at night and goes into the next afternoon). <br><br> The simulated entrainment rate is nearly a factor of two smaller in the less turbulent POC than in the more turbulent overcast region. However, the inversion rises at a nearly uniform rate across the domain because powerful buoyancy restoring forces counteract horizontal inversion height gradients. A secondary circulation develops in the model that diverts subsiding free-tropospheric air away from the POC into the surrounding overcast region, counterbalancing the weaker entrainment in the POC with locally weaker subsidence
Electronic properties of the pseudogap system (TaSe4)2I
The room temperature ``metallic'' properties of the quasi-one-dimensional
charge density wave system (TaSe4)2I differ markedly from those expected of
either a Fermi or a Luttinger Liquid. We discuss evidence for the simplest
possible explanation of the observed behavior of (TaSe4)2I in its conducting
phase - namely the existence of large quasi-static fluctuations of structural
order, which however remain of finite extent above the charge density wave
transition temperature. These fluctuations produce a pseudogap in the density
of states. We compute the temperature dependence of the optical and DC
conductivities of (TaSe4)2I in its conducting phase, the nature of its core
hole spectra, and the NMR relaxation rate. Predictions for these quantities are
made on the basis of a Lee, Rice and Anderson model. This model represents the
simplest theory of a pseudogap, and gives satisfactory agreement with
experiment in the cases where comparisons can be made. In contrast, the
predictions of a strongly correlated (Luttinger Liquid) model appear to to
contradict the data. The chief remaining discrepancy is that the gap appearing
in transport quantities is less than that observed in photoemission. We discuss
some possibilities for resolving this issue.Comment: 41 pages latex, 11 ps figures, uses IOP macro
Rates of carbonate cementation associated with sulphate reduction in DSDP/ODP sediments: implications for the formation of concretions
DSDP/ODP porewater profiles in organic carbon-bearing (<5% org. C) sediments commonly show decreases in Ca2+ concentrations and increases in alkalinity over depths where sulphate is being removed by microbial reduction. These Ca2+ depletion profiles represent the combined effect of diffusion, advection and reaction (addition by ion exchange and removal by precipitation mainly as CaCO3 and/or dolomite). A diagenetic model has been used to estimate the rate constant (k) for Ca2+ removal by precipitation during sulphate depletion over depths of 15-150 m, assuming first order kinetics. The rate constants for Ca2+ removal range from 10(-14) to 10(-11) s(-1) in 19 DSDP/ODP sediments, which span a range of bottom water temperatures (0-10 degreesC), lithologies (calcareous to clastic) and sedimentation rates (0.001-0.4 cm year(-1)). Values of k correlate with sedimentation rate (omega) such that log k=1.16 log omega-10.3, indicating that faster rates of Ca2+ removal occur at higher sedimentation rates where there are also higher degrees of saturation with respect to CaCO3 and dolomite. Depth-integrated masses of Ca2+ removed (<100 mumol cm(-2)) during sulphate depletion over these depth ranges are equivalent to a dispersed phase of approximately 1.5 wt.% CaCO3 or 3 wt.% dolomite in a compacted sediment. The complete occlusion of sediment porosity observed in concretions with isotopic signatures suggesting carbonate sourced from sulphate reduction therefore requires more time (a depositional hiatus), more rapid sulphate reduction (possibly by anaerobic methane oxidation) and/or the continued transport of isotopically light carbonate to the concretion site after sulphate reduction has ceased
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