High Reynolds number tests of a Douglas DLBA 032 airfoil in the Langley 0.3-meter transonic cryogenic tunnel

A wind-tunnel investigation of a Douglas advanced-technology airfoil was conducted in the Langley 0.3-Meter Transonic Cryogenic Tunnel (0.3-m TCT). The temperature was varied from 227 K (409 R) to 100 K (180 R) at pressures ranging from about 159 kPa (1.57 atm) to about 514 kPa (5.07 atm). Mach number was varied from 0.50 to 0.78. These variables provided a Reynolds number range (based on airfoil chord) from 6.0 to 30.0 x 10 to the 6th power. This investigation was specifically designed to: (1) test a Douglas airfoil from moderately low to flight-equivalent Reynolds numbers, and (2) evaluate sidewall-boundary-layer effects on transonic airfoil performance characteristics by a systematic variation of Mach number, Reynolds number, and sidewall-boundary-layer removal. Data are included which demonstrate the effects of fixing transition, Mach number, Reynolds number, and sidewall-boundary-layer removal on the aerodynamic characteristics of the airfoil. Also included are remarks on model design and model structural integrity

Editorial Board

Board of Editors Linda M. Trueb Allen P. Lanning Janet Freeman Martha Sheehy James A. Hubble Scott C. Wurster Staff James R. Bellis Kraig C. Kazda Wendy A. Fitzgerald Kathleen M. Magone Douglas Stevenson Charles S. Jordan Michael A. Magone Patrick R. Watt Faculty Advisor William L. Corbett Law Review Secretary Kathleen A. Cassid

Asymptotics and Dimensional Dependence of the Number of Critical Points of Random Holomorphic Sections

We prove two conjectures from [M. R. Douglas, B. Shiffman and S. Zelditch, Critical points and supersymmetric vacua, II: Asymptotics and extremal metrics. J. Differential Geom. 72 (2006), no. 3, 381-427] concerning the expected number of critical points of random holomorphic sections of a positive line bundle. We show that, on average, the critical points of minimal Morse index are the most plentiful for holomorphic sections of {\mathcal O}(N) \to \CP^m and, in an asymptotic sense, for those of line bundles over general K\"ahler manifolds. We calculate the expected number of these critical points for the respective cases and use these to obtain growth rates and asymptotic bounds for the total expected number of critical points in these cases. This line of research was motivated by landscape problems in string theory and spin glasses.Comment: 14 pages, corrected typo

Editorial Board

Editor-in Chief Douglas D. Dasinger Business Manager J. Dwaine Royball Footnote Editor John R. Gordon Book Editor Harry B. Endsley III Note Editor Larry Petersen Decision Editor Sidney J. Strong Staff William J. Carl Lawrence F. Daly Earl J. Hanson James A. Poore III Brent R. Cromley Joseph T. Swindlehurst Dale Schwanke Faculty Advisor Larry M. Eliso

Editorial Board

Editor-in-Chief Douglas Stevenson Editors James R. Bellis Wendy A. Fitzgerald Kathleen M. Magone E. Wayne Phillips Patrick R. Watt Associate Editors Thomas W. Christie John Richardson Staff Thomas W. Christie Kevin C. Culum Carol A. Donaldson Alan J. Hall Michael V. Harrington Josh Richardson Susan G. Ridgeway Cynthia Kegley Smith Barbara J. Tucker Faculty Advisor William L. Corbet

Editorial Board

Editor-in Chief John A. Alexander Recent Decision Editor Melvyn M. Ryan Note Editor Douglas C. Allen Business Manager Thomas F. Dowling Staff Robert Cotontzos Conrad B. Fredricks John N. Radonich James W. Thompson Thomas E. Towe Kenneth R. Wilson Faculty Advisor Edward L. Kimbal

Santa Clara Magazine, Volume 32 Number 4, Summer 1990

10 - WHAT\u27S UP WITH COMIC BOOKS? Comic books aren\u27t what they used to be but they continue to charm our children. By Mitch Finley \u2773 14 - STRESS, ILLNESS, AND PSYCHOTHERAPY The meaning of a stressful situation determines whether it is perceived as a challenge to be overcome or a demoralization. By Jerome D. Frank 18 - A BEELINE TO THE USA Killer bees have been winging their way from Brazil since scores of queens escaped a Sao Paolo lab in 1957. By Paul M. McCarthy \u2746 21 - PROMISE & OPPORTUNITY An economic forecast for the 1990s by the University\u27s favorite prognosticator. By Mario Belotti 24 - MISSIONARY MAN Notes from the African bush by an alumnus who spent five months in 1989 as a medical missionary in Kenya. By Douglas M. Frye \u2779 28 - PAT MALLEY: HE MADE A DIFFERENCE What he meant to Santa Clara and its community may never by fully measured. By R. Michael McNultyhttps://scholarcommons.scu.edu/sc_mag/1040/thumbnail.jp