2,078 research outputs found
Calibration and Verification of Jason-1 Using Global Along-Track Residuals with TOPEX
No full textIt is demonstrated that the Jason-1 measurements of sea surface height (SSH), wet path delay, and ionosphere path delay are within required accuracies, via a global cross-calibration with similar measurements made by TOPEX/Poseidon (T/P) over a 6-month period. Since the two satellites were on the same groundtrack separated in time by only 70 s, measurements were recorded at approximately the same location and time. The variations in the wet path delay measured by Jason-1 compared to T/P are only 5 mm RMS, well within the required performance of 1.2 cm RMS. The RMS of the ionosphere differences is also well within the expected values, with a mean RMS of 1.2 cm. The largest difference is that the Jason-1 SSH is biased high relative to T/P SSH by 144 mm after the T/P and Jason-1 data are both corrected with improved sea state bias (SSB) models. However, the bias will change if a different SSB model is used, so the user should be cautious that the bias used matches the SSB models. The bias is generally constant within ± 10 mm in the open ocean, but appears to be higher or lower in some regions. Additionally, the SSH has been verified by comparison with 36 island tide gauges over the same period. After removing the global relative bias, the Jason-1 SSH data agree with tide gauges within 3.7 cm RMS and with T/P data within about 3.5 cm RMS on average for 1-s measurements, meeting the required accuracy of 4.2 cm RMS
DS_10.1177_0363546518777247 – Supplemental material for Bone Bruise Patterns in Skeletally Immature Patients With Anterior Cruciate Ligament Injury: Shock-Absorbing Function of the Physis
No full textSupplemental material, DS_10.1177_0363546518777247 for Bone Bruise Patterns in Skeletally Immature Patients With Anterior Cruciate Ligament Injury: Shock-Absorbing Function of the Physis by João V. Novaretti, Jason J. Shin, Marcio Albers, Monique C. Chambers, Moises Cohen, Volker Musahl and Freddie H. Fu in The American Journal of Sports Medicine</p
Author meets critics: Advertising revolutionary: The life and work of Tom Burrell
No full textIn this roundtable, Dr. Jason Chambers discusses his book Advertising Revolutionary: The Life and Work of Tom Burrell (University of Illinois Press, 2024), which focuses on Tom Burrell\u27s influence on African American representation in advertising. Participants, including scholars and industry professionals, examine Burrell\u27s leadership style, shaped by his experiences at agencies like Leo Burnett and Needham, where he faced imposter syndrome and challenges in getting his creative work recognized. These experiences inspired his approach to nurturing African American talent and fostering cultural sensitivity. Participants also detail Burrell\u27s philosophy of positive realism, which focused on authentic, positive portrayals of Black life versus stereotypical media depictions. Burrell\u27s upbringing, particularly his relationship with his father and his mother\u27s chronicling of his career, also influenced his determination and leadership. The conversation covers the generational shift in leadership at Burrell Communications and the ongoing challenges of diversity and authentic representation in the industry. The discussion concludes with advice for future image-makers focused on resilience, cultural understanding, and meaningful engagement with diverse audiences—all of which were keys to Burrell\u27s success and legacy
Southern Ocean Velocity and Geostrophic Transport Fields Estimated by Combining Jason Altimetry and Argo Data
No full textZonal geostrophic velocity fields above 1975 dbar have been estimated for the Southern Ocean from 2004 into 2011 based on sea surface topography observed by Jason altimetry and temperature/salinity measured by Argo autonomous floats. The velocity at 1000 dbar estimated with the method has been compared to Argo drift trajectory at the same pressure level available from the Asia Pacific Data Research Center (APDRC). The inferred velocities agree with those from the Argo drift within the estimated sampling error of the latter, but have fewer gaps in space and time. The velocity has also been integrated from depth to surface to determine the mean and time-variable zonal geostrophic transport in the Southern Ocean between 29.5°S and 58.5°S, primarily in the South Atlantic and South Indian Ocean basins, due to limitations in coverage of Argo. Analysis shows errors can be reduced by \u3e 70% by averaging gridded results over wide areas. Zonal transport averaged over the entire Indian Ocean basin shows a significant correlation with the Antarctic Oscillation (AAO) at low frequencies: transport is higher than normal during a positive phase of the AAO, and lower during the negative phase
Disempowering Through Definition: A Dialogic Ethics for Understanding Consumer Vulnerability Through Nike's 'Mike and Spike' Advertising and African American Consumer History
No full text"I propose a dialogic ethics as a framework for understanding vulnerability and responsibility in consumer environments. Paulo Freire, in particular, helps us to understand that our humanity is bound in dialogue. Dialogue requires co-participation. The naming of groups as vulnerable through sweeping generalizations neglects to empower the oppressed by giving them voice in the encounter. When definitions of vulnerability are instituted in cultural and social structures of meaning without appropriate respect for and discourse with those so-named, then we risk instituting a culture of silence from the oppressed or ""vulnerable."" This dehumanizes the oppressed and diffuses the structures of accountability that come with liberation. Instead, we must engage in true dialogue that accepts multiple voices, presents message that enable critical consciousness and empowers the participants, acknowledges the historical circumstances of our language in discourse, and promotes our humanness, which we find in relation to others."Made available in DSpace on 2015-09-28T15:15:48Z (GMT). No. of bitstreams: 2
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Previous issue date: 2010Embargo set by: Seth Robbins for item 87888
Lift date: Forever
Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDsRestricted to the U of I community idenfinitely during batch ingest of legacy ETDsU of I Only324 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2010
Estimating Mean Sea Level Change from the TOPEX and Jason Altimeter Missions
No full textThe Jason-2 satellite altimeter mission was launched in June 2008, extending the record of precision sea level measurements that was initiated with the launch of TOPEX/Poseidon in 1992 and continued with the launch of Jason-1 in December 2001. We have used the measurements from these three missions to construct a seamless record of global mean sea level change from 1993 to the present. We present the results of our calibration activities, including data comparisons during the “tandem period” of the missions, during which we solve for biases between the missions, as well as comparisons to independent tide gauge sea level measurements. When the entire record is assembled, the average rate of sea level rise from 1993–2009 is 3.4 ± 0.4 mm/year. There is considerable interannual variation due to ENSO-related processes, which include the period of lower sea level rise over the last three years of the time series during the recent La Nina event
Deadness: technologies of the intermundane
No full textPosthumous duets—performances involving a dead singer and a living one—have become ubiquitous in popular music. As the case of Natalie and Nat “King” Cole’s “Unforgettable” makes clear, all sound recording harnesses the productive capacities of both living and dead, patterned through specific forms of co-laboring, or “deadness.
Environmental variables affect fungal diversity on blueberry (Vaccinium spp.) leaf surfaces:
No full textThe economically important blueberry, Vaccinium cyanococcus, is susceptible to a number of diseases, some of which are propagated by fungi living on the leaf surface. The leaf surface (phylloplane) is a cryptic environment that harbors a variety of pathogens and pathogen antagonists, and these populations are affected by many factors including weather, season, host plant location and leaf phenology. Blueberry leaves were collected in April, June, August, and October over two years from bushes in wild areas and cultivated farms along transects perpendicular to the Atlantic City Expressway, to address the hypothesis that pollution from a major highway would influence phylloplane communities. Leaves were washed and plated on potato dextrose agar, and fungal epiphytes were identified using taxonomic keys and microscopy. Epicoccum spp., Alternaria spp., Pennicilium spp., and Curvularia spp. were the most ubiquitous fungi isolated from blueberry leaves. Community structure and species richness changed from site-to-site and month-to-month and from year-to-year. The influence of highway proximity to fungal communities was not significant. Management practices in cultivated sites accounted for much of the variation in species richness and community composition among sites. Leaf age also influenced the community structure of phylloplane fungi communities. Leaves collected in April had significantly lower species richness than those collect in later months (F=19.37, P<0.0001). Yearly differences in species richness and community structure were likely due to differences in meteorological variables. Greater information provided by frequency of occurrence of fungal species would lead to a more informative multivariate analysis as presence or absence would be weighted by abundance, allowing for interpretations of dominance and more detailed analysis of phylloplane fungal communities.M.S.Includes bibliographical references (p. 25-27)by Jason Stanwoo
Gravimetric Methods – Satellite Altimeter Measurements
No full textSatellite altimetry has become an important tool for studying the Earth\u27s oceans. Here, we summarize the basic concepts of satellite radar altimeters, starting from how range is measured, how the precise orbit height is calculated, and how these are combined to determine sea surface height (SSH). Corrections needed to account for path delays of the radar pulse in the atmosphere and biases at the surface are also discussed. These include the ionosphere, wet troposphere, and dry troposphere atmospheric corrections and the sea state bias and inverted barometer surface corrections. The calibration and verification of the SSH measurement are explained, using specific examples from TOPEX/Poseidon, Jason-1, and Jason-2/Ocean Surface Topography Mission. We also comment on some geophysical applications of the altimeter measurement, including measuring the ocean geoid, bathymetry, and global mean sea level. In closing, we briefly discuss other types of satellite altimeters, including laser, delay-Doppler, and wide swath altimeters
Multi-attribute tradespace exploration and its application to evolutionary acquisition
No full textThesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2003.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Includes bibliographical references (p. 144).by Jason Edward Derleth.S.M
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