1,738 research outputs found
A Place to Meet: Living with Critical Theory as a Mode of Care in Everyday Artistic Practice
This essay is a place where the everyday meets critical artistic practice meets theory. Within a critical artistic researcher’s everyday practice, critical theory is lived and practiced in modes that are material and felt. Building on the of critical theorists who write explicitly about their relationships with theory, three researchers write vignettes detailing small moments in their practice. The vignettes make visible the ways the everyday and critical theory interlock and show how critical artistic research asks us to consider ways of caring, being accountable, attending to, and growing sensibilities for living with critical theories
The Kuiper Belt Luminosity Function from m(R)=21 to 26
We have performed an ecliptic imaging survey of the Kuiper belt with our
deepest and widest field achieving a limiting flux of m(g') = 26.4, with a sky
coverage of 3.0 square-degrees. This is the largest coverage of any other
Kuiper belt survey to this depth. We detect 72 objects, two of which have been
previously observed. We have improved the Bayesian maximum likelihood fitting
technique presented in Gladman et al. (1998) to account for calibration and sky
density variations and have used this to determine the luminosity function of
the Kuiper belt. Combining our detections with previous surveys, we find the
luminosity function is well represented by a single power-law with slope alpha
= 0.65 +/- 0.05 and an on ecliptic sky density of 1 object per square-degree
brighter than m(R)=23.42 +/- 0.13. Assuming constant albedos, this slope
suggests a differential size-distribution slope of 4.25 +/- 0.25, which is
steeper than the Dohnanyi slope of 3.5 expected if the belt is in a state of
collisional equilibrium. We find no evidence for a roll-over or knee in the
luminosity function and reject such models brightward of m(R) ~ 24.6.Comment: 50 Pages, 8 Figure
Recommended from our members
Media exposure to mass violence events can fuel a cycle of distress.
The established link between trauma-related media exposure and distress may be cyclical: Distress can increase subsequent trauma-related media consumption that promotes increased distress to later events. We tested this hypothesis in a 3-year longitudinal study following the 2013 Boston Marathon bombings and the 2016 Orlando Pulse nightclub massacre using a national U.S. sample (N = 4165). Data were collected shortly after the bombings, 6 and 24 months post-bombings, and beginning 5 days after the Pulse nightclub massacre (approximately 1 year later; 36 months post-bombings). Bombing-related media exposure predicted posttraumatic stress symptoms (PTS) 6 months later; PTS predicted worry about future negative events 2 years after the bombings, which predicted increased media consumption and acute stress following the Pulse nightclub massacre 1 year later. Trauma-related media exposure perpetuates a cycle of high distress and media use
Near-Infrared Imaging Survey of Faint Companions around Young Dwarfs in the Pleiades Cluster
We conducted a near-infrared imaging survey of 11 young dwarfs in the
Pleiades cluster using the Subaru Telescope and the near-infrared coronagraph
imager. We found 10 faint point sources, with magnitudes as faint as 20 mag in
the K-band, around 7 dwarfs. Comparison with Spitzer archive images revealed
that a pair of the faint sources around V 1171 Tau are very red in the infrared
wavelengths, indicative of very low-mass young stellar objects. However, the
results of our follow-up proper motion measurements implied that the central
star and the faint sources do not share common proper motions, suggesting that
they are not physically associated.Comment: 13 pages. Accepted for publication in Research in Astronomy and
Astrophysic
Wandering Fests: Relational Orientations in Academic Writing
Based on a number of PhD workshops called Wandering Feasts, in collaboration between Monash University and Design School Kolding, this article explores academic writing as both a mode and a method of inquiry. The article both points to and performs five creative-relational orientations to alternative academic writing: Performativity in challenging dominant ways of knowing and representing knowledge in the academy; emergence as mindfully holding open ideas of purpose and destination in favour of not-knowing; reciprocity in collectively creating charged encounters that spark new ways of knowing; improvisation in building social space where we felt comfortable jamming and givenness as a fundamental playfulness in which an academic community nurtures the courage to give–of ourselves. The article is in itself a manifestation of exploration writing in a playful and loosely defined process
The Impact of Dispersion on Amplitude and Frequency Noise in a Yb-fiber Laser Comb
We describe a Yb-fiber based laser comb, with a focus on the relationship
between net-cavity dispersion and the frequency noise on the comb. While tuning
the net cavity dispersion from anomalous to normal, we measure the amplitude
noise (RIN), offset frequency (f_CEO) linewidth, and the resulting frequency
noise spectrum on f_CEO. We find that the laser operating at zero net-cavity
dispersion has many advantages, including an approximately 100x reduction in
free-running f_CEO linewidth and frequency noise power spectral density between
laser operation at normal and zero dispersion. In this latter regime, we
demonstrate a phase-locked f_CEO beat with low residual noise
Using shrinkage in multilevel models to understand intersectionality: a simulation study and a guide for best practice
Recommended from our members
Absolute-Frequency Measurement of the Iodine-Based Length Standard at 514.67 nm
The absolute frequency of the length standard at 514.67 nm based on the molecular iodine (127I 2) transition of the P(13) 43-0 component a3 is measured using a self-referenced femtosecond optical comb. This frequency-based technique improves measurement precision more than 100 times compared with previous wavelength-based results. Power- and pressure-related frequency shifts have been carefully studied. The measured absolute frequency is 71.8±1.5 kHz higher than the internationally accepted value of 582490603.37±0.15 MHz, adopted by the Comité International des Poids et Mesures (CIPM) in 1997
Origin and Dynamical Evolution of Neptune Trojans - II: Long Term Evolution
We present results examining the fate of the Trojan clouds produced in our
previous work. We find that the stability of Neptunian Trojans seems to be
strongly correlated to their initial post-migration orbital elements, with
those objects that survive as Trojans for billions of years displaying
negligible orbital evolution. The great majority of these survivors began the
integrations with small eccentricities (e < 0.2) and small libration amplitudes
(A < 30 - 40{\deg}). The survival rate of "pre-formed" Neptunian Trojans (which
in general survived on dynamically cold orbits (e < 0.1, i < 5 - 10{\deg}))
varied between ~5 and 70%. By contrast, the survival rate of "captured" Trojans
(on final orbits spread across a larger region of e-i element space) were
markedly lower, ranging between 1 and 10% after 4 Gyr. Taken in concert with
our earlier work, we note that planetary formation scenarios which involve the
slow migration (a few tens of millions of years) of Neptune from an initial
planetary architecture that is both resonant and compact (aN < 18 AU) provide
the most promising fit of those we considered to the observed Trojan
population. In such scenarios, we find that the current day Trojan population
would number ~1% of that which was present at the end of the planet's
migration, with the bulk being sourced from captured, rather than pre-formed
objects. We note, however, that even those scenarios still fail to reproduce
the currently observed portion of the Neptune Trojan population moving on
orbits with e 20{\deg}. Dynamical integrations of the currently
observed Trojans show that five out of the seven are dynamically stable on 4
Gyr timescales, while 2001 QR322, exhibits significant dynamical instability.
The seventh Trojan object, 2008 LC18, has such large orbital uncertainties that
only future studies will be able to determine its stability.Comment: 24 pages, 6 figures, accepted for publication in MNRAS (The abstract
was shortened. Original version can be found in the pdf file
- …