2,320 research outputs found
Anchoring emergency lightweight shelters
Field tests have been conducted to address the question: âwhat are the major aspects to consider using anchors in the humanitarian sector?. Influence of soil, weather, type and combination of anchors, installation, orientation, inclination, depth, displacement and price have been measured. An extensive study of anchor usage, practice recommendations with step by step checklists and a handout for humanitarian field practitioners is provided to identify the best anchoring option for their context of intervention.Postprint (published version
Understanding the three and four-leg inverter Space Vector
This paper shows a new point of view of the classical voltage space vectors and its implications on
three and four-leg converters. It is easy to find in the literature, authors using bi-dimensional and threedimensional
representations of the converter states. Nonetheless, the literature rarely specifies what these
spaces represent. Therefore, this paper proposes a wide analysis of the state voltages and its references
for three-leg, three-leg four-wire and four-leg inverters, in favour of understanding the space vector
behaviour under three and four-wire scenarios.Postprint (published version
Ressenyes
Obra ressenyada: Julian CHRYSOSTOMIDES (ed.), Monumenia Peloponnesiaca. Documents for the history of the Peloponnese in the 14th and 15th centuries. Camberley : Porphyrogenitus Ltd. Publications, 1995
CHRYSOSTOMIDES, JuliĂĄn (Ed.). Monumenia Peloponnesiaca. Documenls for ÂĄhe history oĂ ihe Peloponnese in Ihe ÂĄ4th and ÂĄ5th centuries. Camberley : Porpnyrogenitus Ltd. Publications, 1995.
Resum no disponibl
Velocity Distribution in a Viscous Granular Gas
We investigate the velocity relaxation of a viscous one-dimensional granular
gas, that is, one in which neither energy nor momentum is conserved in a
collision. Of interest is the distribution of velocities in the gas as it
cools, and the time dependence of the relaxation behavior. A Boltzmann equation
of instantaneous binary collisions leads to a two-peaked distribution with each
peak relaxing to zero velocity as 1/t while each peak also narrows as 1/t.
Numerical simulations of grains on a line also lead to a double-peaked
distribution that narrows as 1/t. A Maxwell approximation leads to a
single-peaked distribution about zero velocity with power-law wings. This
distribution narrows exponentially. In either case, the relaxing distribution
is not of Maxwell-Boltzmann form
Exploring the movement dynamics of deception
Both the science and the everyday practice of detecting a lie rest on the same assumption: hidden cognitive states that the liar would like to remain hidden nevertheless influence observable behavior. This assumption has good evidence. The insights of professional interrogators, anecdotal evidence, and body language textbooks have all built up a sizeable catalog of non-verbal cues that have been claimed to distinguish deceptive and truthful behavior. Typically, these cues are discrete, individual behaviorsâa hand touching a mouth, the rise of a browâthat distinguish lies from truths solely in terms of their frequency or duration. Research to date has failed to establish any of these non-verbal cues as a reliable marker of deception. Here we argue that perhaps this is because simple tallies of behavior can miss out on the rich but subtle organization of behavior as it unfolds over time. Research in cognitive science from a dynamical systems perspective has shown that behavior is structured across multiple timescales, with more or less regularity and structure. Using tools that are sensitive to these dynamics, we analyzed body motion data from an experiment that put participants in a realistic situation of choosing, or not, to lie to an experimenter. Our analyses indicate that when being deceptive, continuous fluctuations of movement in the upper face, and somewhat in the arms, are characterized by dynamical properties of less stability, but greater complexity. For the upper face, these distinctions are present despite no apparent differences in the overall amount of movement between deception and truth. We suggest that these unique dynamical signatures of motion are indicative of both the cognitive demands inherent to deception and the need to respond adaptively in a social context
Description of a New Halophilic Tiger Beetle in the Genus Eunota (Coleoptera, Cicindelidae, Cicindelini) Identified Using Morphology, Phylogenetics and Biogeography
Tiger beetles are a popular group of insects amongst amateur naturalists, and are well-represented in museum and private collections. New species descriptions plateaued in the 19th century, but there is a recent resurgence of discoveries as integrative taxonomy methods, guided by molecular systematics, uncover âcrypticâ tiger beetle diversity. In this paper, we describe a new species using multiple data types. This new species, Eunota mecocheila Duran and Roman n. sp., is in the tribe Cicindelini, and is described from specimens collected in saline muddy ditches in northern Mexico. This species is closely related to E. circumpicta (LaFertĂ©-SĂ©nectĂšre, 1841), but is separated based on morphological differences, geographic range, and genetic differentiation. Little is known about the biology or distribution of this species and it has only been collected from two sites in the state of Coahuila. Given the location of this new species, and its genetic divergence from its closest relative, E. circumpicta, we discuss the historical biogeography that may have led to isolation and speciation. The male and female dorsal, lateral and frontal habitus and the male aedeagus are shown
- âŠ