Development of closed loop roll control for magnetic balance systems

This research was undertaken with the goal of demonstrating closed loop control of the roll degree of freedom on the NASA prototype magnetic suspension and balance system at the MIT Aerophysics Laboratory, thus, showing feasibility for a roll control system for any large magnetic balance system which might be built in the future. During the research under this grant, study was directed toward the several areas of torque generation, position sensing, model construction and control system design. These effects were then integrated to produce successful closed loop operation of the analogue roll control system. This experience indicated the desirability of microprocessor control for the angular degrees of freedom

Application of digital control to a magnetic model suspension and balance model

The feasibility of using a digital computer for performing the automatic control functions for a magnetic suspension and balance system (MSBS) for use with wind tunnel models was investigated. Modeling was done using both a prototype MSBS and a one dimensional magnetic balance. A microcomputer using the Intel 8080 microprocessor is described and results are given using this microprocessor to control the one dimensional balance. Hybrid simulations for one degree of freedom of the MSBS were also performed and are reported. It is concluded that use of a digital computer to control the MSBS is eminently feasible and should extend both the accuracy and utility of the system

Application of superconducting coils to the NASA prototype magnetic balance

Application of superconducting coils to a general purpose magnetic balance was studied. The most suitable currently available superconducting cable for coils appears to be a bundle of many fine wires which are transposed and are mechanically confined. Sample coils were tested at central fields up to .5 Tesla, slewing rates up to 53 Tesla/ sec and frequencies up to 30 Hz. The ac losses were measured from helium boil-off and were approximately 20% higher than those calculated. Losses were dominated by hysteresis and a model for loss calculation which appears suitable for design purposes is presented along with computer listings. Combinations of two coils were also tested and interaction losses are reported. Two feasible geometries are also presented for prototype magnetic balance using superconductors

Education Reform for the Digital Era

Will the digital-learning movement repeat the mistakes of the charter-school movement? How much more successful might today's charter universe look if yesterday's proponents had focused on the policies and practices needed to ensure its quality, freedom, and resources over the long term? What mistakes might have been avoided? Damaging scandals forestalled? Missed opportunities seized

Changes in meal participation, attendance, and test scores associated with the availability of universal free school breakfasts.

This study investigates student outcomes associated with changes in the availability of universal free breakfasts at elementary schools in the Guilford County Schools ðGCSÞ in North Carolina. In 2007–8, the GCS offered universal free breakfasts in schools with high proportions of economically disadvantaged students. In 2008–9, the GCS reduced its universal free programs, with the affected schools returning to eligibility-based programs. We examine how breakfast and lunch participation, attendance, and reading, math, and science test scores changed across years at affected and unaffected schools. We find that the switch from a universal free to an eligibility-based School Breakfast Program reduced breakfast participation substantially with the largest changes occurring among students who were not eligible for free or reduced-price meals. The changes to eligibility-based provision were associated with decreases in lunch participation for paid-eligible students but not for other students. The changes to eligibility-based provision did not harm test scores or attendance

The Grizzly, February 18, 2010

Every Ending Starts with a Beginning • Record-Breaking Blizzard Evokes Varied Reactions • Could Watching the Super Bowl Damage Your Heart? • Snow Storm Photos • Senior Class Gift Drive • SPINTfest \u2710 Brings New Themes for Houses • UC Goes Red to Raise Awareness About the Risks of Heart Disease • Opinion: Teenage Pregnancy TV Shows are a Big Hit, But What\u27s the Effect? • Tragedy Strikes in Early Hours of Winter Olympics • Men\u27s Basketball Shuts Down McDanielhttps://digitalcommons.ursinus.edu/grizzlynews/1806/thumbnail.jp

Analysis of the VPg-Proteinase (NIa) Encoded by Tobacco Etch Potyvirus: Effects of Mutations on Subcellular Transport, Proteolytic Processing, and Genome Amplification

A mutational analysis was conducted to investigate the functions of the tobacco etch potyvirus VPgproteinase (NIa) protein in vivo. The NIa N-terminal domain contains the VPg attachment site, whereas the C-terminal domain contains a picornavirus 3C-like proteinase. Cleavage at an internal site separating the two domains occurs in a subset of NIa molecules. The majority of NIa molecules in TEV-infected cells accumulate within the nucleus. By using a reporter fusion strategy, the NIa nuclear localization signal was mapped to a sequence within amino acid residues 40 to 49 in the VPg domain. Mutations resulting in debilitation of NIa nuclear translocation also debilitated genome amplification, suggesting that the NLS overlaps a region critical for RNA replication. The internal cleavage site was shown to be a poor substrate for NIa proteolysis because of a suboptimal sequence context around the scissile bond. Mutants that encoded NIa variants with accelerated internal proteolysis exhibited genome amplification defects, supporting the hypothesis that slow internal processing provides a regulatory function. Mutations affecting the VPg attachment site and proteinase activesite residues resulted in amplification-defective viruses. A transgenic complementation assay was used to test whether NIa supplied in trans could rescue amplification-defective viral genomes encoding altered NIa proteins. Neither cells expressing NIa alone nor cells expressing a series of NIa-containing polyproteins supported increased levels of amplification of the mutants. The lack of complementation of NIa-defective mutants is in contrast to previous results obtained with RNA polymerase (NIb)-defective mutants, which were relatively efficiently rescued in the transgenic complementation assay. It is suggested that, unlike NIb polymerase, NIa provides replicative functions that are cis preferentia

The Grizzly, April 14, 2011

Ursinus Enjoys Sixth Annual CoSA Event • Students Participate in 30 Hour Famine • Haverford Professor Guest Lectures on Physics Theory • Dr. Ruth Rosenberg Speaks on Holocaust Remembrance • Ursinus Welcomes Patti Smith • Tips on Surviving and Salvaging Bad Internships • Hypnotist Brings Laughs • How to Avoid Allergy Season • Linking Up with LinkedIn • Internship Spotlight: Lindsay Budnick • Opinions: Response to Article Segregation in the 21st Century ; Verizon\u27s DroidX-R2D2 has Cool Features But is Not for Me; President Obama Sends CIA Agents to Libya • How Far Ursinus Goes to Keep Students Safe on Main Street • New Coach and New Outlook Lead UC Softball • Gymnasts Named All-Americans at Championshipshttps://digitalcommons.ursinus.edu/grizzlynews/1834/thumbnail.jp

The Grizzly, February 10, 2011

Bonners Give Insight on Organization • Kappa Alpha Psi Fraternity to Participate in Spring Intake • Future UC President Dr. Bobby Fong Receives National Award • Ursinus College Plays Host to W. R. Crigler • GRE Makeover and Helpful Hints to Ace the Test • Calvin Levels Performs One Man Show in the Blackbox • New Program Brings Students and Professors Closer • Internship Profile: Matt Angle • Opinion: UC Town Hall Meeting Proved a Bit Disappointing; Letter to a Writer; A Multicultural Ursinus Campus on the Way; Upheaval in the Middle East: Why Students Should Care • Murren Adds Name to History Books During Seasonhttps://digitalcommons.ursinus.edu/grizzlynews/1829/thumbnail.jp

The Grizzly, April 22, 2010

Yesterday Marks Ursinus\u27 Fifth Annual CoSA • John Corson Announced as Ursinus Interim President • Dean Nolan Named Vice President of Student Affairs • Southeast Asian Student Association Presents Tour of Asia to Students and Faculty • John Strassburger 5K Run is a Success • The Lantern Unveiled with New Surprises • NCAA\u27s First Openly Gay Football Captain Speaks at UC • Going the Distance with a Nose • Erin Dickerson: Promoting Diversity at Ursinus • UCDC Brings a Round of Fresh Performances Tonight Through Saturday • Opinions: Discovering the Pros and Cons of Unpaid Internships; Transferring and Adapting to Life at UC; An Ursinus Student\u27s Journey to Istanbul, Turkey • UC Women\u27s Tennis Continues with Season • Softball Coaches Might Begin to Look to UC for Advicehttps://digitalcommons.ursinus.edu/grizzlynews/1812/thumbnail.jp