The Effect of Ice Formations on Propeller Performance

Measurements of propeller efficiency loss due to ice formation are supplemented by an analysis to establish the magnitude of efficiency losses to be anticipated during flight in icing conditions. The measurements were made during flight in natural icing conditions; whereas the analysis consisted of an investIgation of changes in blade-section aerodynamic characteristics caused by ice formation and the resulting propeller efficiency changes. Agreement in the order of magnitude of eff 1- ciency losses to be expected is obtained between measured and analytical results. The results indicate that, in general, efficiency losses can be expected to be less than 10 percent; whereas maximum losses, which will be encountered only rarely, may be as high as 15 or 20 percent. Reported. losses larger than 15 or 20 percent, based on reductions in airplane performance, probably are due to ice accretions on other parts of the airplane. Blade-element theory is used in the analytical treatment, and calculations are made to show the degree to which the aerodynamic characteristics of a blade section. must be altered to produce various propeller efficiency losses. The effects of ice accretions on airfoil-section characteristics at subcritical speeds and their influence on drag-divergence Mach number are examined, and. the attendant maximum efficiency losses are computed. The effect of kinetic heating on the radial extent of ice formation is considered, and its influence on required length of blade heating shoes is discussed. It is demonstrated how the efficiency loss resulting from an icing encounter is influenced by the decisions of the pilot in adjusting the engine and propeller controls

Towards a Common Center: Locating Common Characteristics of African Centeredness in an Independent African Centered Learning Environment

As a culturally relevant alternative to traditional public school environments, Independent African Centered schools feature a particular type of culturally relevant pedagogy. This study explored the teachers’ and administrator’s perceptions and applications of African Centered pedagogy in an African Centered school. Interviews, observations and a document review served as the source of data for this study. This basic interpretive study utilized a qualitative research design to explore the perceptions and application of African Centeredness among the participants. An analysis of the data revealed categories and themes related to the school’s mission and the participants’ perceptions and performance of African-centered pedagogy. Three general conclusions were drawn from the findings. Implications for theory, study limitations and recommendations for future research are provided

Soul In A Can : Exploring How Black Male Students And Artists Navigate The Constraints Of Urban Classrooms And The Music Industry

ABSTRACT “Soul in a Can” builds on research that explores Black male identity and containment within structures where racial power is distributed inequitably. This research responds to a need for more diversity regarding the range of Black male voices explored in academic literature. This arts-based qualitative research used a case study design to explore how Black male students and artists navigate the constraints of urban classrooms and the music industry. The following questions guided this exploration: How do contemporary professional Black male recording artists navigate the recording industry’s tendency to restrain their personal “voice” and creative agency in the process of commodifying their talents? How do Black male youth navigate classroom spaces to maintain their personal “voice” and creative agency? Are there similarities between the experiences of Black male artists and Black males in the education system and how they navigate the power differential they face? Data is comprised of participant interviews with six Black males including three students and three professional recording artists. Interviews were conducted in a two-phase process that respectively focused on participant rendered key metaphorsand sound worlds.More specifically, the researcher employed a Critical Race Theory frame emphasizing two of its components— “whiteness as property” and “interest convergence”—along with an Arts-Based Methodology which employed a fugue of elements in order to creatively collect and analyze data. Significantly the study chronicles and offers insight into the Black experience and resistance in two sites—the music industry and classrooms—as lived by Black male artists and students. Notably, these two sites have not been adequately examined in relation to one another. Findings reveal that participants across sites navigated inequitable power through a four-phase process— “I’ll figure it out,” “Peep Game,” “New Attitude,” and “Experience is the best teacher”—in which experiential knowledge was refined and sharpened; this enabled participants to successfully survive endemic racism, but questions remain regarding what the author terms dysconscious acquiescenceor the apparent belief that “surviving” is a substitute for “thriving.” Implications abound regarding the impact of structural containment on Black identity development, cultural authenticity, and expression

The Ursinus Weekly, November 2, 1942

First forum hears political, economic stakes of the war • Unity in diversity will be subject of interdenominational conference • Council president tells vespers of religion in college • Fathers\u27 Day banquet to feature addresses by Steward and Ditter • Praise the lord chaplain attended college during \u2728 • Old timers\u27 day to feature Gettysburg game and dance • Curtain Club books play tryouts for Tuesday night • Library increases rake-off on books that are overdue • English Club schedules book review for tonight • Former college nurse attending U.S. Army somewhere in England • Detwiler, Brunner elected to fill council vacancies • Bayne to address chemists • Bears will be out for dragon meat in first home game on Saturday • Three coeds place on all-college team • One fifty pounders to begin scrimmage for opening games • Bakermen drop close 1-0 decision to Swarthmore • Ursinus, Bryn Mawr battle to 2-2 tie • Bryn Mawr jayvees wallop Ursinus coeds 7-1 in opener • Gettysburg whips Drexel by score of 18-0 Saturday • Lady with the Packard Clipper and the dog -- that\u27s Miss Snell • Haverford booters defeat bears 10-0 • Sixty-five couples attend varsity dance on Saturday • IRC adopts plan to study post war reconstructionshttps://digitalcommons.ursinus.edu/weekly/1743/thumbnail.jp

The Ursinus Weekly, October 5, 1942

Over 135 students speed graduation in summer school • Abraham Hendricks succumbs at home after long illness • President McClure greets largest new enrollment Thursday in chapel • Founders\u27 Day program to honor Dr. Pfahler in dedication ceremony • College buildings to close at 5:30 • Work-study plan attracts 20 men • College opens buildings to 3 summer conclaves • Freshmen stagger through first week of mysteries at Ursinus • Miss Beck takes post as assistant librarian • Ursinus to participate in student war loan program • Swartley sets deadline • Five delegates attend Kanestaki conference • Y handbook guides puzzled freshmen • Letter received from Y\u27s Spanish refugee • Dr. McClure attends Colgate inauguration • The Ursinus College faculty • Here they are - largest enrollment of new students! • Summer sports feature intramurals and softball • Thirty-eight men out for football as second week of practice begins • Stevens is completing plans for inauguration of 150-lb. grid league • Grid schedule to include two home, two away games • Eight holdovers brighten outlook for girls hockey • Mules meet G-burg • Stevens enters his second year optimistically • Over twenty veterans report for soccer practice • Plea for humility made by Snyder, former Y prexy • R. C. Bartman promoted to captain in Navy • Carrying on the traditionhttps://digitalcommons.ursinus.edu/weekly/1739/thumbnail.jp

The Degeneracy, Selection Rules, and Other Properties of the Normal Vibrations of Certain Polyatomic Molecules

The number, degeneracies, and symmetries of the normal modes of vibration are given for molecules in which several atoms are bonded to a central atom. Ninety-nine symmetries, including all possible structures with three to seven atoms and the more important structures of eight and nine atoms are listed in tables. The selection rules for the Raman and infrared spectra are included as well a

The Ursinus Weekly, March 29, 1943

Naval forces call for senior women to join reserves • College band to play for Mardi Gras fete, planned as soph hop • Sheeder and Pancoast will supervise Army, Navy qualifying examinations • Rader scores hit at spring formal • Cub and Key picks 5 men in annual prom tapping • Lobbyist to speak for federal union • New war bond drive initiated to buy jeep • Freshman starlets gain plaudits with dramatic mystery • Y to sponsor fools\u27 frolic • Negro men to lead vespers • Pre-med group to see movie • Nancy Landis elected May queen • IRC discusses Pacific war at meeting Tuesday evening • Wentzel will speak • Chemists to hear Schonfeld • Once-beaten coeds close 1943 season with easy 28-19 victory at Rosemont • Thirty-two will fight it out in boxing and wrestling bill • Harrington ends year with 17-point average • Sinclair leads Highland to 20-0 shutout Tuesday • Thumbnail sketches of the girls\u27 varsity squad • Jayvees subdue Rosemont with lop-sided triumph • Minister stresses sympathetic liveshttps://digitalcommons.ursinus.edu/weekly/1758/thumbnail.jp

Rising Above Misinformation or Fake News in Africa: Another Strategy to Control COVID-19 Spread

Ahinkorah BO, Ameyaw EK, Hagan Jr. JE, Seidu A-A, Schack T. Rising Above Misinformation or Fake News in Africa: Another Strategy to Control COVID-19 Spread. Frontiers in Communication. 2020;5:1-5.Misinformation related to the COVID-19 pandemic is gradually gaining much popularity and amplifying the threat facing humanity about the continuous spread of the virus regardless of one's location. Although some of the influx of these falsehoods may be harmless, others might pose a serious threat by misleading the general population to depend on unjustified and/unsubstantiated claims for protection and show preference for them against scientifically proven guidelines. This paper provides a clear understanding on some COVID-19 misinformation, the inherent implications this poses to public health in Africa and highlights the potential strategies to curb this trend

Scoring system to facilitate diagnosis of Gaucher disease

Background: Gaucher disease (GD) manifests heterogeneously and other conditions are often misdiagnosed in its place, leading to diagnostic delays. The Gaucher Earlier Diagnosis Consensus (GED‐C) initiative proposed a point‐scoring system (PSS) based on the signs and covariables that are most indicative of GD to help clinicians identify which individuals to test for GD. Aims: To validate the PSS retrospectively in a test population including patients with GD and other conditions with overlapping manifestations. Methods: Four cohorts of adults with GD, liver disease (LD), haematological malignancy (HM) or immune thrombocytopenia were identified from hospital records. Clinical data were audited for GED‐C factors identified as potentially indicative of GD and aggregate scores calculated (sum of scores/number of factors) based on published PSS weightings. Threshold discriminatory PSS scores, sensitivity and specificity were determined by receiver‐operating characteristic (ROC) analysis. Results: Among 100 patients (GD, n = 25; non‐GD, n = 75), analyses based on 11 possible factors estimated group mean (standard deviation) PSS scores of: GD (n = 14), 1.08 (0.25); non‐GD (n = 38), 0.58 (0.31). Mean between‐group difference (95% confidence interval (CI)) was (−0.49 (−0.68, −0.31)) and area under the ROC analysis curve (95% CI) was 0.88 (0.78, 0.97). A threshold PSS score of 0.82 identified all 14 patients with GD in the analysis set (100% sensitivity) and 27 of 38 patients in the non‐GD group (71% specificity). Patients with LD and HM were most likely to have manifestations overlapping GD. Conclusions: Preliminary validation of the GED‐C PSS discriminated effectively between patients with GD and those with overlapping signs