17,081 research outputs found
Employment, unemployment and informality in Zimbabwe: Concepts and data for coherent policy-making
This document is part of a digital collection provided by the Martin P. Catherwood Library, ILR School, Cornell University, pertaining to the effects of globalization on the workplace worldwide. Special emphasis is placed on labor rights, working conditions, labor market changes, and union organizing.ILO_EmploymentUnemploymentandInformalityinZimbabwe.pdf: 1098 downloads, before Oct. 1, 2020
Characterization of the FE-I4B pixel readout chip production run for the ATLAS Insertable B-layer upgrade
The Insertable B-layer (IBL) is a fourth pixel layer that will be added
inside the existing ATLAS pixel detector during the long LHC shutdown of 2013
and 2014. The new four layer pixel system will ensure excellent tracking,
vertexing and b-tagging performance in the high luminosity pile-up conditions
projected for the next LHC run. The peak luminosity is expected to reach 3 x
10^34 cm^-2 s^-1 with an integrated luminosity over the IBL lifetime of 300
fb^-1 corresponding to a design lifetime fluence of 5 x 10^15 n_eq cm^-2 and
ionizing dose of 250 Mrad including safety factors. The production front-end
electronics FE-I4B for the IBL has been fabricated at the end of 2011 and has
been extensively characterized on diced ICs as well as at the wafer level. The
production tests at the wafer level were performed during 2012. Selected
results of the diced IC characterization are presented, including measurements
of the on-chip voltage regulators. The IBL powering scheme, which was chosen
based on these results, is described. Preliminary wafer to wafer distributions
as well as yield calculations are given
On the Two-Point Correlation Function in Dynamical Scaling and SCHR\"Odinger Invariance
The extension of dynamical scaling to local, space-time dependent rescaling
factors is investigated. For a dynamical exponent , the corresponding
invariance group is the Schr\"odinger group. Schr\"odinger invariance is shown
to determine completely the two-point correlation function. The result is
checked in two exactly solvable models.Comment: Geneva preprint UGVA/DPT 1992/09-783, plain Tex 6pp (to appear in
Int. J. Mod. Phys. C
Phase-ordering kinetics: ageing and local scale-invariance
Dynamical scaling in ageing systems, notably in phase-ordering kinetics, is
well-established. New evidence in favour of Galilei-invariance in
phase-ordering kinetics is reviewed.Comment: 7 pages, 1 figure,with AIP macros, based on invited talks given at
the 8th Granada Seminar on Computational and Statistical Physics (7-11
February 2005) and at the Symposium `Renormalization and Scaling' at Berlin
(5th of March 2005
Dynamical symmetries and causality in non-equilibrium phase transitions
Dynamical symmetries are of considerable importance in elucidating the
complex behaviour of strongly interacting systems with many degrees of freedom.
Paradigmatic examples are cooperative phenomena as they arise in phase
transitions, where conformal invariance has led to enormous progress in
equilibrium phase transitions, especially in two dimensions. Non-equilibrium
phase transitions can arise in much larger portions of the parameter space than
equilibrium phase transitions. The state of the art of recent attempts to
generalise conformal invariance to a new generic symmetry, taking into account
the different scaling behaviour of space and time, will be reviewed. Particular
attention will be given to the causality properties as they follow for
co-variant -point functions. These are important for the physical
identification of n-point functions as responses or correlators.Comment: Latex2e, 26 pages, 1 figure. Final form, a new example added & typos
correcte
The Effects of Displayed Violence and Game Speed in First-Person Shooters on Physiological Arousal and Aggressive Behavior
Many studies have been conducted to examine the effects of displayed violence in digital games on outcomes like aggressive behavior and physiological arousal. However, they often lack a proper manipulation of the relevant factors and control of confounding variables.
In this study, the displayed violence and game speed of a recent first-person shooter game were varied systematically using the technique of modding, so that effects could be explained properly by the respective manipulations. Aggressive behavior was measured with the standardized version of the Competitive Reaction Time Task or CRTT (Ferguson et al., 2008}. Physiological arousal was operationalized with four measurements: galvanic skin response (GSR), heart rate (HR), body movement, force on mouse and keyboard.
A total of N = 87 participants played in one of four game conditions (low- vs. high-violence, normal- vs. high speed) while physiological measurements were taken with finger clips, force sensors on input devices (mouse and keyboard), and a Nintendo Wii balance board on the chair they sat on. After play, their aggressive behavior was measured with the CRTT.
The results of the study do not support the hypothesis that playing digital games increases aggressive behavior. There were no significant differences in GSR and HR, but with a higher game speed, participants showed less overall body movement, most likely to meet the game’s higher demands on cognitive and motor capacities. Also, higher game speed and displayed violence caused an increase in applied force on mouse and keyboard. Previous experience with digital games did not moderate any of these findings. Moreover, it provides further evidence that the CRTT should only be used in a standardized way as a measurement for aggression, if at all. Using all 7 different published (though not validated) ways to calculate levels of aggression from the raw data, “evidence” was found that playing a violent digital game increases, decreases, or does not change aggression at all.
Thus, the present study does extend previous research. Firstly, it shows the methodological advantages of modding in digital game research to accomplish the principles of psychological (laboratory) experiments by manipulating relevant variables and controlling all others. It also demonstrates the test-theoretical problems of the highly diverse use of the CRTT. It provides evidence that for a meaningful interpretation of effects of displayed violence in digital games, there are other game characteristics that should be controlled for since they might have an effect on relevant outcome variables. Further research needs to identify more of those game features, and it should also improve the understanding of the different measures for physiological arousal and their interrelatedness
- …