177 research outputs found
Synoptic and Mesoscale Dynamics of Snowbands in Winter Cyclones
No full textThe key findings related to the narrow bands are: (1) The simulated embedded narrow bands were oriented vertically upright, their widths and evolution characteristics similar to radar observations; (2) Conditional symmetric instability did not contribute to the formation of the narrow bands, rather, the release of potential instability at the interface of the dry slot and the trowal led to the development of upright convection and initiated the narrow bands. As the initial precipitation moved northward and progressed into the mid-level deformation zone associated with the trowal and warm frontal zone, they were stretched into elongated narrow bands particularly along the strongest and narrow deformation regions; (3) As bands propagated across the trowal, new bands developed at the interface of the dry slot and trowal forming the multi-banded structure.Made available in DSpace on 2015-09-28T14:52:20Z (GMT). No. of bitstreams: 2
license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5)
3160891.pdf: 26830080 bytes, checksum: d1d02ca9f72d45fbbdded01cfb4092ac (MD5)
Previous issue date: 2004Embargo set by: Seth Robbins for item 87246
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 Only154 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2004
Mesoscale Ensemble Prediction of Mid-Latitude Cyclones
No full textA unique aspect of this work was the assessment of these multiple, distinct mesoscale ensemble subsets, incorporating initial condition, model physics and lateral boundary uncertainties present in mid-latitude cyclone prediction. The use of separate ensemble subsets permitted direct comparison of the contributions from different uncertainty sources. Through the examination of the ensemble prediction results for cyclone central pressure, cyclone track, etc., and through statistical analysis, we gained an understanding of the utility of the MEPS for mid-latitude cyclone prediction. The BGM and PO breeding methods were found to be far superior to the MC method in generation of a set of initial conditions for ensemble prediction. A notable characteristic of the model physics perturbation ensemble is its ability to alleviate the problems caused by the unperturbed lateral boundary condition. The new technique for generating lateral boundary perturbations was successfully implemented and tested, and showed promising results. The large spread values in the lateral boundary ensembles demonstrated the importance of lateral boundary uncertainties in the mesoscale ensemble system.Made available in DSpace on 2015-09-28T14:52:19Z (GMT). No. of bitstreams: 2
license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5)
3153281.pdf: 22621539 bytes, checksum: 9e8e87bcfb8fb6c0bcf3ce173d63bbc9 (MD5)
Previous issue date: 2004Embargo set by: Seth Robbins for item 87243
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 Only255 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2004
Pressure fluctuations in centrifugal compressor diffusers
No full textThe unstable flow phenomenon like rotating stall and surge in centrifugal compressors occur at very low flow rates. These would cause unduly large vibrations in the turbo- machinery components and results in mechanical failure. It is important to detect this phenomenon and avoid it by means of early warning systems. An attempt has been made in this paper to study the pressure fluctuations using high frequency miniature transducers in vane and vaneless diffusers of a centrifugal compressor. The unstable nature of the flow is characterized. The observation from the measurements indicate the pressure fluctuations in the vane diffusers are getting amplified and carried to the exit of the diffuser whereas in the case of vaneless diffuser such a phenomena is not observed. The flow near the leading edge of diffuser plays an important role in diffuser performance. The unsteady pressure fluctuations in the diffuser are characterized in terms of instability parameter at various locations in the diffuser. The location where such an instability parameter is sensitive to the flow coefficient is identified as the diffuser throat. Through this instability parameter it is possible to provide early warning just before compressor goes into stall. (Author
Development Of Robust Higher Order Transverse Deformable Elements For Composite Laminates
No full textTranscoding Proxy for Wireless Web
No full textI would like to gratefully acknowledge the time, effort, advice and endless patience of my advisor, Dr. Byrav Ramamurthy during this work. This work is a result of great amount of leverage and support shown by him, right from the beginning. I would also like to thank Dr. Steve Goddard and Dr. Scott Henninger for their valuable suggestions. I would also like to thank my friends Siva Sunkavalli and Mohan Chirumamilla, for their support and help through out this project. Finally, I have to acknowledge that the search engine Google
Online Guide: Remote Sensing
No full textPart of the University of Illinois Weather World 2010 project, this guide uses multimedia technology and the dynamic capabilities of the web to incorporate text, colorful diagrams, animations, computer simulations, audio, and video to introduce topics and concepts in the atmospheric sciences. This site consists of two web-based instructional modules. The Radar Section covers the basics of radar and target detection, interpreting radar imagery, and applications of radar in forecasting. The Satellite Section discusses the GOES and POES satellites, the images they produce, and how to interpret them. Educational levels: Graduate or professional, High school, Undergraduate lower division, Undergraduate upper division
Online Guide: Severe Storms
No full textPart of the University of Illinois Weather World 2010 project, this guide uses multimedia technology and the dynamic capabilities of the web to incorporate text, colorful diagrams, animations, computer simulations, audio, and video to introduce topics and concepts in the atmospheric sciences. This module is a combination of two elements. The first is the National Oceanic and Atmospheric Administration (NOAA) Severe Storms Spotters Guide. The second is a section discussing the efforts and results of modeling severe storms. The Spotters Guide contains supplemental instructional resources and a program designed to familiarize meteorologists and advanced severe storm spotters with the "building blocks" of convective storm structure. The focus of the training series is the development of a thunderstorm "spectrum" and a discussion of the physical characteristics and severe weather potential of the various storm types in the spectrum. Educational levels: Graduate or professional, High school, Undergraduate lower division, Undergraduate upper division
Geoscience Cyberinfrastructure in the Cloud: Data-Proximate Computing to Address Big Data and Open Science Challenges
No full textRecommended from our members
Controlling Photo Processes Within a Confined Space: Switches, Triggers, and Electron Transfer
No full textMany important biological processes, such as photosynthesis and vision are fueled by light. Selective photoisomerization of cis-retinal linked to rhodopsin protein causes vision. Biochemical structures like, pockets of enzymes, interiors of chaperones and inner-space of proteins are few examples of confined space in nature. Light seems to be an ideal external control element for many chemical and biological manipulations. In this work, we used water-soluble deep cavitand “octa acid” (OA) as a nanocarriers to carry out various photo processes like, photoswitches, phototriggers and electron transfer. We used NMR techniques to understand the encapsulation and photoreaction of guest molecules with OA capsule.4 We also monitored the photochemical reaction by absorption, fluorescence, and transient absorption spectra. We explained the role of confined space of OA in controlling the ground and excited state properties of photoactive molecules.</p
- …
