4,819 research outputs found
Gaseous Electronics
Contains reports on two research projects.Joint Services Electronics Program (Contract DAAB07-71-C-0300)University of California, Livermore (Subcontract No. 7877409
The President’s Powers as Commander-in-Chief Versus Congress’ War Power and Appropriations Power
Gaseous Electronics
Contains reports on three research projects.Joint Services Electronics Program (Contract DAAB07-71-C-0300
IMPACTS OF REDUCED PESTICIDE USE ON THE PROFITABILITY OF THE FRUIT AND VEGETABLE SECTOR
Environmental Economics and Policy,
Transcutaneous measurement of blood velocity profiles and flow
A comprehensive report is presented of the application of a pulsed ultrasound Doppler velocity meter for transcutaneous measurement of time varying velocity, velocity profiles, and instantaneous flow in arteries of anaesthetized dogs. The procedure used to provide direct velocity and flow calibration using the Doppler equation is outlined. Typical transcutaneous recordings obtained from the femoral artery, abdominal aorta, and carotid artery are illustrated. The results compare favourably with data obtained by invasive means such as electromagnetic cuff flowmeters. The possibility of high resolution, non-invasive haemodynamic measurements on dogs is demonstrated and the application to conscious human subjects suggeste
Specification and control of routing and synchronization requirements of office forms using Petri nets
Call number: LD2668 .R4 CMSC 1987 M54Master of ScienceComputing and Information Science
Eigenvalue initialisation and regularisation for Koopman autoencoders
Regularising the parameter matrices of neural networks is ubiquitous in
training deep models. Typical regularisation approaches suggest initialising
weights using small random values, and to penalise weights to promote sparsity.
However, these widely used techniques may be less effective in certain
scenarios. Here, we study the Koopman autoencoder model which includes an
encoder, a Koopman operator layer, and a decoder. These models have been
designed and dedicated to tackle physics-related problems with interpretable
dynamics and an ability to incorporate physics-related constraints. However,
the majority of existing work employs standard regularisation practices. In our
work, we take a step toward augmenting Koopman autoencoders with initialisation
and penalty schemes tailored for physics-related settings. Specifically, we
propose the "eigeninit" initialisation scheme that samples initial Koopman
operators from specific eigenvalue distributions. In addition, we suggest the
"eigenloss" penalty scheme that penalises the eigenvalues of the Koopman
operator during training. We demonstrate the utility of these schemes on two
synthetic data sets: a driven pendulum and flow past a cylinder; and two
real-world problems: ocean surface temperatures and cyclone wind fields. We
find on these datasets that eigenloss and eigeninit improves the convergence
rate by up to a factor of 5, and that they reduce the cumulative long-term
prediction error by up to a factor of 3. Such a finding points to the utility
of incorporating similar schemes as an inductive bias in other physics-related
deep learning approaches.Comment: 18 page
Pointing Guns
The American gun debate is increasingly populated with scenes of people pointing and otherwise displaying guns. What is the legal regime governing gun displays, and how well can it address the distinct social and legal problems they pose? In this Essay, we argue that the current structure of criminal law does not supply clear rules of conduct sufficient to avoid the negative effects of gun displays, and that the rhetorical and expressive effects of Second Amendment debates threaten to make the situation worse. We also suggest how the legal rules might be improved, and how battles over norms—as much as criminal prohibitions and defenses—will continue to shape both social practice and law when it comes to displays of firearms in public and towards other persons
SOCCER THROW-IN KINEMATICS
Soccer is played extensively throughout the world. As the
popularity of soccer increases in America, a development of the
teaching and coaching techniques is needed. Despite the
increasing amount of soccer literature, the soccer throw-in skill
has been understated. Up to date, only a few studies have
assessed the throw-in biomechanically (Lueft, 1965; Kline, 1980;
Levendusky, 1982) and have provided some descriptive data
concerning kinematics and kinetics. The throw-in is a unique
throwing motion in that both hands must be used, the ball must
come from behind the head forward, and both feet must maintain
contact with the ground until release as stipulated by the laws of
the game (FIFA, 1977). As a result, the coordination of the upper
body movements and the supporting lower body enable a player to
throw for longer distances
The President\u27s Powers as Commander-in-Chief Versus Congress\u27 War Power and Appropriations Power
This joint work explores a variety of viewpoints all centered around the War Powers Resolution and its application to the situation in the Persian Gulf
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