8,793 research outputs found
Criteria for vibration testing
Systematic application of response spectral analysis and other analyses determine damping sensitivity of flight environment and candidate laboratory tests. Computerized comparison is made between response spectrum for flight environment, or enveloping spectra for collection of flight events, and response spectrum for candidate laboratory test
An instinct for detection: psychological perspectives on CCTV surveillance
The aim of this article is to inform and stimulate a proactive, multidisciplinary approach to research and development in surveillance-based detective work. In this article we review some of the key psychological issues and phenomena that practitioners should be aware of. We look at how human performance can be explained with reference to our biological and evolutionary legacy. We show how critical viewing conditions can be in determining whether observers detect or overlook criminal activity in video material. We examine situations where performance can be surprisingly poor, and cover situations where, even once confronted with evidence of these detection deficits, observers still underestimate their susceptibility to them. Finally we explain why the emergence of these relatively recent research themes presents an opportunity for police and law enforcement agencies to set a new, multidisciplinary research agenda focused on relevant and pressing issues of national and international importance
Reply to Farine and Aplin: Chimpanzees choose their association and interaction partners
Farine and Aplin (1) question the validity of our study reporting group-specific social dynamics in chimpanzees (2). As alternative to our approach, Farine and Aplin advance a âprenetwork permutationâ methodology that tests against random assortment (3). We appreciate Farine and Aplinâs interest and applied their suggested approaches to our data. The new analyses revealed highly similar results to those of our initial approach. We further dispel Farine and Aplinâs critique by outlining its incompatibility to our study system, methodology, and analysis.First, when we apply the suggested prenetwork permutation to our proximity dataset, we again find significant population-level differences in association rates, while controlling for population size [as derived from Farine and Aplinâs script (4); original result, P < 0.0001; results including prenetwork permutation, P < 0.0001]. Furthermore, when we ⊠â”1To whom correspondence may be addressed. Email: ejcvanleeuwen{at}gmail.com
Analysis of polarizability measurements made with atom interferometry
We present revised measurements of the static electric dipole
polarizabilities of K, Rb, and Cs based on atom interferometer experiments
presented in [Phys. Rev. A 2015, 92, 052513] but now re-analyzed with new
calibrations for the magnitude and geometry of the applied electric field
gradient. The resulting polarizability values did not change, but the
uncertainties were significantly reduced. Then we interpret several
measurements of alkali metal atomic polarizabilities in terms of atomic
oscillator strengths , Einstein coefficients , state lifetimes
, transition dipole matrix elements , line strengths
, and van der Waals coefficients. Finally, we combine atom
interferometer measurements of polarizabilities with independent measurements
of lifetimes and values in order to quantify the residual contribution to
polarizability due to all atomic transitions other than the principal
- transitions for alkali metal atoms.Comment: 23 pages, 9 figures, 6 table
Detect the unexpected: a science for surveillance
Purpose â The purpose of this paper is to outline a strategy for research development focused on addressing the neglected role of visual perception in real life tasks such as policing surveillance and command and control settings. Approach â The scale of surveillance task in modern control room is expanding as technology increases input capacity at an accelerating rate. The authors review recent literature highlighting the difficulties that apply to modern surveillance and give examples of how poor detection of the unexpected can be, and how surprising this deficit can be. Perceptual phenomena such as change blindness are linked to the perceptual processes undertaken by law-enforcement personnel. Findings â A scientific programme is outlined for how detection deficits can best be addressed in the context of a multidisciplinary collaborative agenda between researchers and practitioners. The development of a cognitive research field specifically examining the occurrence of perceptual âfailuresâ provides an opportunity for policing agencies to relate laboratory findings in psychology to their own fields of day-to-day enquiry. Originality/value â The paper shows, with examples, where interdisciplinary research may best be focussed on evaluating practical solutions and on generating useable guidelines on procedure and practice. It also argues that these processes should be investigated in real and simulated context-specific studies to confirm the validity of the findings in these new applied scenarios
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