656 research outputs found
Texture Modification of the Shuttle Landing Facility Runway at Kennedy Space Center
This paper describes the test procedures and the criteria used in selecting an effective runway-surface-texture modification at the Kennedy Space Center (KSC) Shuttle Landing Facility (SLF) to reduce Orbiter tire wear. The new runway surface may ultimately result in an increase of allowable crosswinds for launch and landing operations. The modification allows launch and landing operations in 20-knot crosswinds, if desired. This 5-knot increase over the previous 15-knot limit drastically increases landing safety and the ability to make on-time launches to support missions in which Space Station rendezvous are planned. The paper presents the results of an initial (1988) texture modification to reduce tire spin-up wear and then describes a series of tests that use an instrumented ground-test vehicle to compare tire friction and wear characteristics, at small scale, of proposed texture modifications placed into the SLF runway surface itself. Based on these tests, three candidate surfaces were chosen to be tested at full-scale by using a highly modified and instrumented transport aircraft capable of duplicating full Orbiter landing profiles. The full-scale Orbiter tire testing revealed that tire wear could be reduced approximately by half with either of two candidates. The texture-modification technique using a Humble Equipment Company Skidabrader(trademark) shotpeening machine proved to be highly effective, and the entire SLF runway surface was modified in September 1994. The extensive testing and evaluation effort that preceded the selection of this particular surface-texture-modification technique is described herein
2018 ASME Student Design Competition - Group T Senior Design Project
The purpose of this project is to create a single soccer playing robot to compete in the 2018 ASME student design competition. The robot, along with spare parts and all other devices must fit inside a 50x50x50 cm box. This robot must be able to traverse the field via remote control and have the ability to control a tennis ball and shoot it with sufficient force
A petrologic and mechanical analysis of the Lion Mountain and Welge sandstones of southern Mason County, Texas
Due to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to [email protected], referencing the URI of the item.Not availabl
Blue fluorescent proteins with enhanced brightness and photostability from a structurally targeted library
The utility of blue fluorescent protein (BFP) has been limited by its low quantum yield and rapid photobleaching. A library targeting residues neighboring the chromophore yielded a variant with enhanced quantum yield (0.55 versus 0.34), reduced pH sensitivity and a 40-fold increase in photobleaching half-life. This BFP, named Azurite, is well expressed in bacterial and mammalian cells and extends the palette of fluorescent proteins that can be used for imaging
Rowan County - Folklore
A series of interviews with Rowan County residents on local and regional folklore
Depression, stigma and social isolation: The psychosocial trifecta of primary chronic cutaneous lupus erythematosus, a cross-sectional and path analysis
OBJECTIVE: Depression is common in individuals with chronic cutaneous lupus erythematosus (CCLE). However, how CCLE may impact patients\u27 psychological well-being is poorly understood, particularly among disproportionally affected populations. We examined the relationships between depression and psychosocial factors in a cohort of predominantly Black patients with primary CCLE (CCLE without systemic manifestations).
METHODS: Cross-sectional assessment of individuals with dermatologist-validated diagnosis of primary CCLE. NIH-PROMIS short-forms were used to measure depression, disease-related stigma, social isolation and emotional support. Linear regression analyses (É‘=0.05) were used to test an a priori conceptual model of the relationship between stigma and depression and the effect of social isolation and emotional support on that association.
RESULTS: Among 121 participants (87.6% women; 85.1% Black), 37 (30.6%) reported moderate to severe depression. Distributions of examined variables divided equally among those which did (eg, work status, stigma (more), social isolation (more), emotional support (less)) and did not (eg, age, sex, race, marital status) significantly differ by depression. Stigma was significantly associated with depression (b=0.77; 95% CI0.65 to 0.90), whereas social isolation was associated with both stigma (b=0.85; 95% CI 0.72 to 0.97) and depression (b=0.70; 95% CI0.58 to 0.92). After controlling for confounders, stigma remained associated with depression (b=0.44; 95% CI0.23 to 0.66) but lost significance (b=0.12; 95% CI -0.14 to 0.39) when social isolation (b=0.40; 95% CI 0.19 to 0.62) was added to the model. Social isolation explained 72% of the total effect of stigma on depression. Emotional support was inversely associated with depression in the univariate analysis; however, no buffer effect was found when it was added to the multivariate model.
CONCLUSION: Our findings emphasise the psychosocial challenges faced by individuals living with primary CCLE. The path analysis suggests that stigmatisation and social isolation might lead to depressive symptoms. Early clinical identification of social isolation and public education demystifying CCLE could help reduce depression in patients with CCLE
On particle acceleration and very high energy gamma-ray emission in Crab-like pulsars
The origin of very energetic charged particles and the production of very
high-energy (VHE) gamma-ray emission remains still a challenging issue in
modern pulsar physics. By applying a toy model, we explore the acceleration of
co-rotating charged particles close to the light surface in a plasma-rich
pulsar magnetosphere and study their interactions with magnetic and photon
fields under conditions appropriate for Crab-type pulsars. Centrifugal
acceleration of particles in a monopol-like magnetic field geometry is analyzed
and the efficiency constraints, imposed by corotation, inverse Compton
interactions and curvature radiation reaction are determined. We derive
expressions for the maximum particle energy and provide estimates for the
corresponding high-energy curvature and inverse Compton power outputs. It is
shown that for Crab-like pulsars, electron Lorentz factor up to can be achieved, allowing inverse Compton (Klein-Nishina) up-scattering
of thermal photons to TeV energies with a maximum luminosity output of
erg/s. Curvature radiation, on the other hand, will result in a
strong GeV emission output of up to erg/s,
quasi-exponentially decreasing towards higher energies for photon energies
below GeV. Accordingly to the results presented only young pulsars
are expected to be sites of detectable VHE -ray emission.Comment: 6 pages, 1 figur
The Vehicle, 1961, Vol. 3 no. 2
Vol. 3, No. 2
Table of Contents
The Voting CattleLinda Kay Campbellpage 5
But For the Passage of TimeDon Shepardsonpage 14
LoveJon Woodspage 16
Infinite JourneyJames E. Martinpage 19
The Clover ChainRichard W. Blairpage 20
SnowballSusan Daughertypage 24
Sureness Is NeverDon Shepardsonpage 26
ConceptionChristine McCollpage 34
Comedy: Relief and GriefTom McPeakpage 35
The Unspoken WordChristine McCollpage 35
CharmBenjamin Polkpage 36
Screaming SpiderTom McPeakpage 39
Just Once in an Early SpringE.J.B.page 39
HummingbirdPauline B. Smithpage 40
Willow TreesPauline B. Smithpage 40
MaturityChristine McCollpage 41
The New YearLinda Campbellpage 41
The StormMary-Jean Pitratpage 42
Ebony IvoryJean Danenbargerpage 42
The Fireball MailAllen Engelbrightpage 43
ExpectationChristine McCollpage 44
CatastropheChristine McCollpage 44
SophisticationBenjamin Polkpage 45
On Playing BridgeMyrna Jo Handleypage 46
SonnetMignon Stricklandpage 48https://thekeep.eiu.edu/vehicle/1009/thumbnail.jp
The Vehicle, 1961, Vol. 3 no. 2
Vol. 3, No. 2
Table of Contents
The Voting CattleLinda Kay Campbellpage 5
But For the Passage of TimeDon Shepardsonpage 14
LoveJon Woodspage 16
Infinite JourneyJames E. Martinpage 19
The Clover ChainRichard W. Blairpage 20
SnowballSusan Daughertypage 24
Sureness Is NeverDon Shepardsonpage 26
ConceptionChristine McCollpage 34
Comedy: Relief and GriefTom McPeakpage 35
The Unspoken WordChristine McCollpage 35
CharmBenjamin Polkpage 36
Screaming SpiderTom McPeakpage 39
Just Once in an Early SpringE.J.B.page 39
HummingbirdPauline B. Smithpage 40
Willow TreesPauline B. Smithpage 40
MaturityChristine McCollpage 41
The New YearLinda Campbellpage 41
The StormMary-Jean Pitratpage 42
Ebony IvoryJean Danenbargerpage 42
The Fireball MailAllen Engelbrightpage 43
ExpectationChristine McCollpage 44
CatastropheChristine McCollpage 44
SophisticationBenjamin Polkpage 45
On Playing BridgeMyrna Jo Handleypage 46
SonnetMignon Stricklandpage 48https://thekeep.eiu.edu/vehicle/1009/thumbnail.jp
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