105 research outputs found
Surveillance, trust, and policing at music festivals
Music festivals are often the highlight of summertime, but they are also spaces increasingly policed for drugs, pickpockets, sexual assault, and terrorist attacks. The pop-up nature of festival spaces creates a tension between organizers ensuring safe environments and festival-goers seeking community and fun. We conducted an online survey of festival-goers to determine their safety concerns and feelings about security measures. The biggest safety concern was authorities, including police, private security, and surveillance. We found significant differences between males and females. Females had more concerns about personal safety and males had negative attitudes about surveillance and security—perhaps reflecting a male privilege. The negative attitude towards surveillance and police was common across demographic groups but stronger in males. A striking finding is that 87% of our participants felt that the ethos of a festival best creates a feeling of safety, while surveillance changes the nature of these public spaces—56% of our respondents felt it creates a bad vibe and 44% said it causes anxiety. We speculate that this sentiment parallels the Defund the Police movement following the Black Lives Matter protests in the United States—community is key to a safe city and surveillance is viewed as creating negative spaces
Adsorption of Line Segments on a Square Lattice
We study the deposition of line segments on a two-dimensional square lattice.
The estimates for the coverage at jamming obtained by Monte-Carlo simulations
and by -order time-series expansion are successfully compared. The
non-trivial limit of adsorption of infinitely long segments is studied, and the
lattice coverage is consistently obtained using these two approaches.Comment: 19 pages in Latex+5 postscript files sent upon request ; PTB93_
Multiscale modeling and simulation of nanotube-based torsional oscillators
In this paper, we propose the first numerical study of nanotube-based torsional oscillators via developing a new multiscale model. The edge-to-edge technique was employed in this multiscale method to couple the molecular model, i.e., nanotubes, and the continuum model, i.e., the metal paddle. Without losing accuracy, the metal paddle was treated as the rigid body in the continuum model. Torsional oscillators containing (10,0) nanotubes were mainly studied. We considered various initial angles of twist to depict linear/nonlinear characteristics of torsional oscillators. Furthermore, effects of vacancy defects and temperature on mechanisms of nanotube-based torsional oscillators were discussed
Melting behavior of ultrathin titanium nanowires
The thermal stability and melting behavior of ultrathin titanium nanowires
with multi-shell cylindrical structures are studied using molecular dynamic
simulation. The melting temperatures of titanium nanowires show remarkable
dependence on wire sizes and structures. For the nanowire thinner than 1.2 nm,
there is no clear characteristic of first-order phase transition during the
melting, implying a coexistence of solid and liquid phases due to finite size
effect. An interesting structural transformation from helical multi-shell
cylindrical to bulk-like rectangular is observed in the melting process of a
thicker hexagonal nanowire with 1.7 nm diameter.Comment: 4 pages, 4 figure
Some aspects of the Liouville equation in mathematical physics and statistical mechanics
This paper presents some mathematical aspects of Classical Liouville theorem
and we have noted some mathematical theorems about its initial value problem.
Furthermore, we have implied on the formal frame work of Stochastic Liouville
equation (SLE)
Níveis de proteína bruta em dietas para bovinos de corte: parâmetros ruminais, balanço de compostos nitrogenados e produção de proteína microbiana
Spinodal decomposition in multicomponent fluid mixtures: A molecular dynamics study
We have investigated the effect of the number p of components on the dynamics of phase separation in two-dimensional symmetric multicomponent fluids. In contrast to concentrated two-dimensional binary fluids, where the growth dynamics is controlled by the coupling of the velocity held to the order parameter, leading to large growth-exponent values, the dynamics in multicomponent fluids (p = 3, 4) is found to follow a t(1/3) growth law, where t is time, which we relate to a long-wavelength evaporation-condensation process. These findings, which are proposed to be consequences of the compact domain structure persisting in multicomponent fluids, imply that hydrodynamic modes do not affect the dynamics of the phase separation in these systems
Consumo e digestibilidades dos nutrientes em bovinos recebendo dietas contendo silagens de milho e sorgo, com e sem inoculante microbiano
Caracterização da galha induzida por ácaro em Laguncularia racemosa (L.) Gaertn (Combretaceae)
Ganho de peso de novilhos mantidos em pastagem natural na encosta do sudeste do Rio Grande do Sul, recebendo níveis crescentes de suplementação energética
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