731 research outputs found
Oral Hisort of Wilena Peterson
Transcript of interview with Wilena Peterson.https://scholars.fhsu.edu/ors/1259/thumbnail.jp
Observational evidence for the origin of X-ray sources in globular clusters
Low-mass X-ray binaries, recycled pulsars, cataclysmic variables and
magnetically active binaries are observed as X-ray sources in globular
clusters. We discuss the classification of these systems, and find that some
presumed active binaries are brighter than expected. We discuss a new
statistical method to determine from observations how the formation of X-ray
sources depends on the number of stellar encounters and/or on the cluster mass.
We show that cluster mass is not a proxy for the encounter number, and that
optical identifications are essential in proving the presence of primordial
binaries among the low-luminosity X-ray sources.Comment: 10 pages, 7 figures, to appear in IAUS 246, Dynamical evolution of
dense stellar systems, ed. E. Vesperin
Ground-water monitoring using polymer optical fibre Bragg gratings
Optical fibre Bragg grating sensors inscribed in polymer optical fibre have been shown to be sensitive to the water content of the medium surrounding the fibre and this property has been applied, for example, to the monitoring of humidity and the water content of aviation fuel. In this work we assess the feasibility of using such sensors for monitoring the saturation of soils, which is important for civil engineering applications. We find a very non-linear response, with a rapid increase in Bragg wavelength as the water content increases from 0 to 0.5%, with a much more gradual, but still monotonic, increase thereafter. We speculate on the causes of this response
Design of ultraprecision machine tools with application to manufacturing of miniature and micro components
Currently the underlying necessities for predictability, producibility and productivity remain big issues in ultraprecision machining of miniature/microproducts. The demand on rapid and economic fabrication of miniature/microproducts with complex shapes has also made new challenges for ultraprecision machine tool design. In this paper the design for an ultraprecision machine tool is introduced by describing its key machine elements and machine tool design procedures. The focus is on the review and assessment of the state-of-the-art ultraprecision machining tools. It also illustrates the application promise of miniature/microproducts. The trends on machine tool development, tooling, workpiece material and machining processes are pointed out
Large-scale structure in the Lyman-alpha forest II: analysis of a group of ten QSOs
The spatial distribution of Ly-alpha forest absorption systems towards ten
QSOs has been analysed to search for large-scale structure over the redshift
range 2.2 < z < 3.4. The QSOs form a closely spaced group on the sky and are
concentrated within a 1 deg^2 field. We have employed a technique based on the
first and second moments of the transmission probability density function which
is capable of identifying and assessing the significance of regions of over- or
underdense Ly-alpha absorption. We find evidence for large-scale structure in
the distribution of Ly-alpha forest absorption at the > 99 per cent confidence
level. In individual spectra we find overdense Ly-alpha absorption on scales of
up to 1200 km s^-1. There is also strong evidence for correlated absorption
across line of sight pairs separated by < 3 h^-1 proper Mpc (q_0 = 0.5). For
larger separations the cross-correlation signal becomes progressively less
significant.Comment: 15 pages, LaTeX, 6 Postscript figures, accepted for publication in
MNRA
The Canada-UK Deep Submillimetre Survey - VIII. Source identifications in the 3-hour field
We present optical, near-infrared (IR) and radio observations of the 3-hour field of the Canada-UK Deep Submillimetre Survey (CUDSS). Of the 27 submillimetre sources in the field, nine have secure identifications with either a radio source or a near-IR source. We show that the percentage of sources with secure identifications in the CUDSS is consistent with that found for the bright ‘8-mJy' submillimetre survey, once allowance is made for the different submillimetre and radio flux limits. Of the 14 secure identifications in the two CUDSS fields, eight are very red objects (VROs) or extremely red objects (EROs), five have colours typical of normal galaxies and one is a radio source that has not yet been detected at optical/near-IR wavelengths. 11 of the identifications have optical/near-IR structures which are either disturbed or have some peculiarity that suggests that the host galaxy is part of an interacting system. One difference between the CUDSS results and the results from the 8-mJy survey is the large number of low-redshift objects in the CUDSS. We give several arguments why these are genuine low-redshift submillimetre sources rather than being gravitational lenses that are gravitationally amplifying a high-z submillimetre source. We construct a K-z diagram for various classes of high-redshift galaxy and show that the SCUBA galaxies are on average less luminous than classical radio galaxies, but are very similar in both their optical/IR luminosities and their colours to the host galaxies of the radio sources detected in μJy radio survey
Moyo Vol. III N 1
Boyden, John and Rich Vanderklok. Are You a $nob? . 2.
Herman, James. River Phoenix: A Final Conversation . 4.
Blake, Ben. Arbor Vitae Victories: Other Crafty Everyday Uses For Those Inconspicuous Little Trees . 9.
Fischesser, S. Separate But Unequal: A View of Denison\u27s Black Orientation . 10.
Gilmore, Seth. Evil Upheaval: The Reforming of Organized Religion... in Granville .; Boyden, John. “Reaching Out & Talking Dirty (When Touching Turns to Touch Tones)”. 20.
Vanderklok, Rich. Gen-X Angst . 24.
Driscoll, Julie. Bang! Thump (Getting A Taste For The Meat Processing Industry). 25.
Stillman, Lisa. The Bare Facts: An Exposé on Public Nudity . 26.
Endicott, Josh. Frames . 29.
Emmons, Alex. Frames . 29.
Emmons, Alex. Untitled. 11.
Bussan, Dave. Bull Session With a Former Editor On Denison\u27s Sacred Cow . 30.
Webb, Aaron. Color Blind: From Diversity Adversity to Racial Rapport . 33.
Archer, Troy Color Blind: From Diversity Adversity to Racial Rapport . 33
Precise Infrared Radial Velocities from Keck/NIRSPEC and the Search for Young Planets
We present a high-precision infrared radial velocity study of late-type stars
using spectra obtained with NIRSPEC at the W. M. Keck Observatory. Radial
velocity precisions of 50 m/s are achieved for old field mid-M dwarfs using
telluric features for precise wavelength calibration. Using this technique, 20
young stars in the {\beta} Pic (age ~12 Myr) and TW Hya (age ~8 Myr)
Associations were monitored over several years to search for low mass
companions; we also included the chromospherically active field star GJ 873 (EV
Lac) in this survey. Based on comparisons with previous optical observations of
these young active stars, radial velocity measurements at infrared wavelengths
mitigate the radial velocity noise caused by star spots by a factor of ~3.
Nevertheless, star spot noise is still the dominant source of measurement error
for young stars at 2.3 {\mu}m, and limits the precision to ~77 m/s for the
slowest rotating stars (v sin i < 6 km/s), increasing to ~168 m/s for rapidly
rotating stars (v sin i > 12 km/s). The observations reveal both GJ 3305 and
TWA 23 to be single-lined spectroscopic binaries; in the case of GJ 3305, the
motion is likely caused by its 0.09" companion, identified after this survey
began. The large amplitude, short-timescale variations of TWA 13A are
indicative of a hot Jupiter-like companion, but the available data are
insufficient to confirm this. We label it as a candidate radial velocity
variable. For the remainder of the sample, these observations exclude the
presence of any 'hot' (P < 3 days) companions more massive than 8 MJup, and any
'warm' (P < 30 days) companions more massive than 17 MJup, on average. Assuming
an edge-on orbit for the edge-on disk system AU Mic, these observations exclude
the presence of any hot Jupiters more massive than 1.8 MJup or warm Jupiters
more massive than 3.9 MJup.Comment: Accepted for publication in The Astrophysical Journal. 18 pages, 7
figure
The Vehicle, Fall 2002
Table of Contents
Caterpillar DreamsAubrey Bonannopage 4
GrandmotherNatalie Espositopage 5
PhotographNatalie Espositopage 5
For My SisterAnn Hudsonpage 6
BuckeyeCaleb Judypage 6
A Moment\u27s GlowMelissa Knoblockpage 7
April 8,1994Andy Kochpage 8
Koch FuneralsAndy Kochpage 9
Grandpa Koch\u27s Sense of HumorAndy Kochpage 10
DeparturesDave Moutraypage 11
1958 VetteAlex Nicolpage 11
HomelandDave Moutraypage 12
The TravelerDave Moutraypage 12
GrandpaJennifer Probstpage 13
Confusion upon LearningJody Sanchezpage 14
Chucktown PrideMike Scalespage 14
I Might be WrongDallas Schumacherpage 15-20
UntitledAlex Nicholpage 21
Late NightRachel Seftonpage 22
Old DreamsRachel Seftonpage 23
Two-Minded ThoughtsRachel Sefton & Jodi Sanchezpage 24
Strange GraffitiMike Scalespage 24
On PoetryNick Slicerpage 25-26
Sometimes Things Just Happen That WayThomas Webbpage 26-33
Biographiespage 34-35
Editor\u27s Notepage 36https://thekeep.eiu.edu/vehicle/1076/thumbnail.jp
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