Prospectus, April 11, 1979

A VICTORIOUS PAKRLAND SPEECH TEAM; Letters to the Editor: PC student disagrees with sports sexism, Canteen boycott is explained, Response to stugo letter, Hedges studo member; PC News in Brief: Self-defense workshop here, Annual canoe trip, Graduates get ready, Insurance available for summer, Annual PC health fair, U of I drum major tryouts, New senator for stugo, PC student art show to begin, Nursing home lecture, Program on plastic surgery, EIU rep here; 7 go to Nationals; Program on energy; Vietnam vets treated unfairly; Billy Joel to be at Assembly Hall April 25; Student from PC is named a delegate; Walkathon April 28; Housewives are stereotyped; Meier helps with AP story; Parkland--A night student\u27s view; Rules for Kreskin; Marijuana survey taken at Parkland; Challenge from Prospectus; Classifieds; HaHaHaHaHaHaHaHaHaHaHaHaHa; Parkland track team places fifth in meet; Cobras have 5-1 record and are fifth in the statehttps://spark.parkland.edu/prospectus_1979/1020/thumbnail.jp

A Path Towards Citizenship: The Effects of Early College High Schools on Criminal Convictions and Voting

Early college high schools (ECHS) are small schools of choice which provide students with the opportunity to earn, at no financial cost to them, two years of transferable college credit or an associate\u27s degree while simultaneously satisfying high school graduation requirements. This promising intervention is aimed at smoothing the transition from high school to college for under-represented minorities and students from economically disadvantaged backgrounds. There are about 80 ECHS in North Carolina, although the model is implemented in many other states as well. While much is known from prior research about the impacts of the intervention on educational attainment, nothing is known about longer term outcomes such as employment, wages, criminal involvement, and voting behavior. The present study will briefly describe the data collection process, research methods, and preliminary findings on the effects of the intervention on voting and criminal conviction in North Carolina. We will also present results on whether impacts on long term civic outcomes are mediated by educational attainment. Quasi-experimental impacts have been validated against impacts generated from a randomized controlled trial of the same intervention in a subset of the sites during the same time period. The team assembled personally-identified population level statewide administrative data on all NC high school students (including ECHS) and linked it to records housed at community colleges, universities, the Department of Public Safety (incarceration), and Board of Elections (voting). Together this effort comprises one of the more comprehensive administrative data collection efforts linking student level K-12, postsecondary, and longer-term outcomes

Prospectus, April 25, 1979

PARKLAND HOSTS HEALTH FAIR; Kreskin amazes Parkland audience; The Looking Glass: Men and women are changing; Two PC students win awards; Teacher aide banquet set; Artists take part in PC Senior Art Mart; Film to be shown on communication; Parkland hosts math contest; ISU rep to be at PC today; Brown bagger here Thurs.; SSU rep here today; Classified Advertising; PC hosts Health Fair: Students encouraged to learn about their health; No laughing matter; Draft is inevitable; The start was slow, but track finishes big; Error-plagued Cobras split, prepare for sectional tourney; Top area wrestlers have interest in attending, wrestling at PC; Gary Rucks signs to play at UMSLhttps://spark.parkland.edu/prospectus_1979/1018/thumbnail.jp

Prospectus, February 14, 1979

HAPPY VALENTINES DAY; Who is it they call St. Valentines?; Proposal before IOC for a central information board; Directory published; \u27Mountain Man\u27 lecturer coming to Parkland Feb. 22; ISO presents program; PC election results are announced; Nursing honored; Western rep. at PC Friday; New mascot painting in gym; Workshop coming; PC enrollment is increasing; PC band is open to everyone; Good notes essential for good grades; Quotable Study Tips; Rape workshop to come to PC soon; Agri-business seminar to continue Saturday; PC women to discuss best-seller; Poetry reading at PC Feb. 22; Relieve your tensions at the Parkland gym; To My Valentine; Snacks, part of America, are not always bad; PC teacher writes book; Classifieds; Choosing a sports school; Cubs visit C-U; Parkland defeats number 1 school; PC to host basketball tourney; PC relay team places thirdhttps://spark.parkland.edu/prospectus_1979/1026/thumbnail.jp

Computations of Combustion-Powered Actuation for Dynamic Stall Suppression

A computational framework for the simulation of dynamic stall suppression with combustion-powered actuation (COMPACT) is validated against wind tunnel experimental results on a VR-12 airfoil. COMPACT slots are located at 10% chord from the leading edge of the airfoil and directed tangentially along the suction-side surface. Helicopter rotor-relevant flow conditions are used in the study. A computationally efficient two-dimensional approach, based on unsteady Reynolds-averaged Navier-Stokes (RANS), is compared in detail against the baseline and the modified airfoil with COMPACT, using aerodynamic forces, pressure profiles, and flow-field data. The two-dimensional RANS approach predicts baseline static and dynamic stall very well. Most of the differences between the computational and experimental results are within two standard deviations of the experimental data. The current framework demonstrates an ability to predict COMPACT efficacy across the experimental dataset. Enhanced aerodynamic lift on the downstroke of the pitching cycle due to COMPACT is well predicted, and the cycleaveraged lift enhancement computed is within 3% of the test data. Differences with experimental data are discussed with a focus on three-dimensional features not included in the simulations and the limited computational model for COMPACT

Combustion-Powered Actuation for Dynamic Stall Suppression - Simulations and Low-Mach Experiments

An investigation on dynamic-stall suppression capabilities of combustion-powered actuation (COMPACT) applied to a tabbed VR-12 airfoil is presented. In the first section, results from computational fluid dynamics (CFD) simulations carried out at Mach numbers from 0.3 to 0.5 are presented. Several geometric parameters are varied including the slot chordwise location and angle. Actuation pulse amplitude, frequency, and timing are also varied. The simulations suggest that cycle-averaged lift increases of approximately 4% and 8% with respect to the baseline airfoil are possible at Mach numbers of 0.4 and 0.3 for deep and near-deep dynamic-stall conditions. In the second section, static-stall results from low-speed wind-tunnel experiments are presented. Low-speed experiments and high-speed CFD suggest that slots oriented tangential to the airfoil surface produce stronger benefits than slots oriented normal to the chordline. Low-speed experiments confirm that chordwise slot locations suitable for Mach 0.3-0.4 stall suppression (based on CFD) will also be effective at lower Mach numbers

The Mass Structure of the Galaxy Cluster Cl0024+1654 from a Full Lensing Analysis of Joint Subaru and ACS/NIC3 Observations

We derive an accurate mass distribution of the rich galaxy cluster Cl0024+1654 (z=0.395) based on deep Subaru BR_{c}z' imaging and our recent comprehensive strong lensing analysis of HST/ACS/NIC3 observations. We obtain the weak lensing distortion and magnification of undilted samples of red and blue background galaxies by carefully combining all color and positional information. Unlike previous work, the weak and strong lensing are in excellent agreement where the data overlap. The joint mass profile continuously steepens out to the virial radius with only a minor contribution \sim 10% in the mass from known subcluster at a projected distance of \sim 700kpc/h. The projected mass distribution for the entire cluster is well fitted with a single Navarro-Frenk-White model with a virial mass, M_{vir} = (1.2 \pm 0.2) \times 10^{15} M_{sun}/h, and a concentration, c_{vir} = 9.2^{+1.4}_{-1.2}. This model fit is fully consistent with the depletion of the red background counts, providing independent confirmation. Careful examination and interpretation of X-ray and dynamical data strongly suggest that this cluster system is in a post collision state, which we show is consistent with our well-defined mass profile for a major merger occurring along the line of sight, viewed approximately 2-3Gyr after impact when the gravitational potential has had time to relax in the center, before the gas has recovered and before the outskirts are fully virialized. Finally, our full lensing analysis provides a model-independent constraint of M_{2D}(<r_{vir}) = (1.4 \pm 0.3) \times 10^{15} M_{sun}/h for the projected mass of the whole system, including any currently unbound material beyond the virial radius, which can constrain the sum of the two pre-merger cluster masses when designing simulations to explore this system.Comment: Accepted by ApJ; 35 pages, 25 figures; including gNFW fit results (Section 5.1), simulated post-shock temperatures consistent with X-ray results using T_{sl} (Section 7.3); Figures 7, 16, 24 added; a version with high resolution figures available at http://www.asiaa.sinica.edu.tw/~keiichi/upfiles/CL0024/ms_highreso.pd

Mass and Hot Baryons in Massive Galaxy Clusters from Subaru Weak Lensing and AMiBA SZE Observations

We present a multiwavelength analysis of a sample of four hot (T_X>8keV) X-ray galaxy clusters (A1689, A2261, A2142, and A2390) using joint AMiBA Sunyaev-Zel'dovich effect (SZE) and Subaru weak lensing observations, combined with published X-ray temperatures, to examine the distribution of mass and the intracluster medium (ICM) in massive cluster environments. Our observations show that A2261 is very similar to A1689 in terms of lensing properties. Many tangential arcs are visible around A2261, with an effective Einstein radius \sim 40 arcsec (at z \sim 1.5), which when combined with our weak lensing measurements implies a mass profile well fitted by an NFW model with a high concentration c_{vir} \sim 10, similar to A1689 and to other massive clusters. The cluster A2142 shows complex mass substructure, and displays a shallower profile (c_{vir} \sim 5), consistent with detailed X-ray observations which imply recent interaction. The AMiBA map of A2142 exhibits an SZE feature associated with mass substructure lying ahead of the sharp north-west edge of the X-ray core suggesting a pressure increase in the ICM. For A2390 we obtain highly elliptical mass and ICM distributions at all radii, consistent with other X-ray and strong lensing work. Our cluster gas fraction measurements, free from the hydrostatic equilibrium assumption, are overall in good agreement with published X-ray and SZE observations, with the sample-averaged gas fraction of = 0.133 \pm 0.027, for our sample = (1.2 \pm 0.1) \times 10^{15} M_{sun} h^{-1}. When compared to the cosmic baryon fraction f_b = \Omega_b/\Omega_m constrained by the WMAP 5-year data, this indicates /f_b = 0.78 \pm 0.16, i.e., (22 \pm 16)% of the baryons are missing from the hot phase of clusters.Comment: accepted for publication in ApJ; high resolution figures available at http://www.asiaa.sinica.edu.tw/~keiichi/upfiles/AMiBA7/ms_highreso.pd