9,923 research outputs found
Tommaso Salini revisited: two new attributions
Tommaso Salini (c.1575–1625) is a frequently forgotten Baroque artist that fell under Caravaggio’s spell, despite having a tempestuous relationship with the great painter. Salini, also known as Mao, was a friend of Giovanni Baglione, the Italian art biographer, who included Salini in his Le vite de’ pittori (1642). Salini is better remembered for his role in the Baglione libel trial of 1603 than he is for his oil paintings, which sit between Caravaggio’s innovative way of painting and Baglione’s mediocre Mannerism.
Art historians have often shied away from exploring Salini’s career because the canvases that have carried his name seem stylistically dissimilar. The recent tendency has been to attribute these works to the anonymous ‘Pseudo-Salini’ painters, but this should form the topic of a separate article. The twentieth century saw art historians generously attribute an excessive amount of work to Salini, and many of these pictures were probably done decades after his death. In order for Salini’s oeuvre to be presented with accuracy, connoisseurs have had to inspect the original works that Baglione mentions being by Salini’s hand, as well as the pictures that have been successfully attributed to him.
Bearing in mind what Baglione wrote, Salini can be revealed as an innovate artist and still life specialist. This article includes a newly attributed still life (Museum of Fine Arts, Boston) as a forgotten Salini, as well as a refreshed attribution of the masterful Piping Shepherd Boy (Foundling Museum, London). These works add weight to Salini being a more famous and better-known painter in his own time than scholarship has shown.Publisher PD
Low-noise nozzle valve
A low noise, variable discharage area, valve is constructed having opposed recesses within which a pair of gates are slidably disposed. Each of the gates is provided with upstream edges having a radius thereon, the radius enabling smooth, accelerated, low noise flow therebetween. The gates are further provided with tracks along each side, which in turn slide along splines set in the side walls of the valve. A threaded rod which rotates in a threaded insert in a rear wall of each of the gates, serves to move the gates within their respective recesses
Curvature Spectra and Nongaussianities in the Roulette Inflation Model
Using the gradient expansion method of Rigopoulos, Shellard and van Tent
which treats cosmological perturbations as gradients on top of a homogeneous
and isotropic FRW background, we study the production of nongaussianities in
the roulette model of inflation. Investigating a number of trajectories within
this two-field model of inflation, we find that while the superhorizon
influence of the isocurvature modes on the curvature bispectrum produces
nonzero contribution to f_NL, the effect is negligible next to the standard
inflationary prediction |f_NL| ~ n_s - 1. This is the case in both the squeezed
and equilateral configurations of the bispectrum, although the former is
slightly larger in the trajectories under consideration.Comment: 23 pages, 6 figures, 3 tables, 1 appendix; Added references, slightly
extended section
Crowdsourcing Swarm Manipulation Experiments: A Massive Online User Study with Large Swarms of Simple Robots
Micro- and nanorobotics have the potential to revolutionize many applications
including targeted material delivery, assembly, and surgery. The same
properties that promise breakthrough solutions---small size and large
populations---present unique challenges to generating controlled motion. We
want to use large swarms of robots to perform manipulation tasks;
unfortunately, human-swarm interaction studies as conducted today are limited
in sample size, are difficult to reproduce, and are prone to hardware failures.
We present an alternative.
This paper examines the perils, pitfalls, and possibilities we discovered by
launching SwarmControl.net, an online game where players steer swarms of up to
500 robots to complete manipulation challenges. We record statistics from
thousands of players, and use the game to explore aspects of large-population
robot control. We present the game framework as a new, open-source tool for
large-scale user experiments. Our results have potential applications in human
control of micro- and nanorobots, supply insight for automatic controllers, and
provide a template for large online robotic research experiments.Comment: 8 pages, 13 figures, to appear at 2014 IEEE International Conference
on Robotics and Automation (ICRA 2014
Order one differential equations on nonisotrivial algebraic curves
In this paper we provide new examples of geometrically trivial strongly
minimal differential algebraic varieties living on nonisotrivial curves over
differentially closed fields of characteristic zero. These are systems whose
solutions only have binary algebraic relations between them. Our technique
involves developing a theory of -forms, and building connections to
deformation theory. This builds on previous work of Buium and Rosen. In our
development, we answer several open questions posed by Rosen and
Hrushovski-Itai
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