Yaw control by tangential forebody blowing

1994 ◽  
Vol 98 (974) ◽  
pp. 147-154
Author(s):  
N.J. Wood ◽  
W.J. Crowther
Keyword(s):  
Angle Of Attack ◽  
Primary Source ◽  
Yaw Control ◽  
Combat Aircraft ◽  
Wide Range ◽  
Nose Cone ◽  
Attached Flow ◽  
The University ◽  
Low Speed Wind Tunnel ◽  
High Angles Of Attack

Summary Aircraft yaw control at high angles of attack by tangential forebody blowing has been investigated experimentally. Tests were performed in the University of Bath 21 m x 1.5 m low speed wind tunnel using a 6% scale generic combat aircraft model fitted with blowing slots in the nose cone. Six component strain gauge balance force and moment data were measured for angles of attack up to 90° for various slot geometries and locations. The effect of slot azimuthal location is demonstrated and a slot stall phenomenon described. A geometry dependent forebody/wing flowfield coupling has been identified which can lead to unexpected yawing and rolling moments. The primary source of yawing moment is shown to be the enhanced area of attached flow on the blown side of the forebody rather than direct vortex influence. The optimum slot extent and location depend on the angle of attack range over which control is required. For regions where steady vortex asymmetry is present, slots near the apex of the forebody produce severe control reversals at low blowing rates. These reversals can be minimised by placing the slots away from the apex. For control in regions where the flow is dominated by periodic vortex shedding, long slots offer efficient control to 90° angle of attack. The most suitable compromise for wide range control would appear to be a short slot placed away from the apex of the forebody.

scholarly journals Leading edge serrations for the reduction of aerofoil self-noise at low angle of attack, pre-stall and post-stall conditions

2021 ◽  
Vol 20 (1-2) ◽  
pp. 130-156
Author(s):  
Giovanni Lacagnina ◽  
Paruchuri Chaitanya ◽  
Jung-Hoon Kim ◽  
Tim Berk ◽  
Phillip Joseph ◽  
...  
Keyword(s):  
Angle Of Attack ◽  
Leading Edge ◽  
Aerodynamic Performance ◽  
Design Guidelines ◽  
Noise Performance ◽  
Text Design ◽  
Reduction Mechanisms ◽  
Wide Range ◽  
Number Formula ◽  
High Angles Of Attack

This paper addresses the usefulness of leading edge serrations for reducing aerofoil self-noise over a wide range of angles of attack. Different serration geometries are studied over a range of Reynolds number [Formula: see text]. Design guidelines are proposed that permit noise reductions over most angles of attack. It is shown that serration geometries reduces the noise but adversely effect the aerodynamic performance suggesting that a trade-off should be sought between these two considerations. The self-noise performance of leading edge serrations has been shown to fall into three angle of attack (AoA) regimes: low angles where the flow is mostly attached, moderate angles where the flow is partially to fully separated, and high angles of attack where the flow is fully separated. Leading edge serrations have been demonstrated to be effective in reducing noise at low and high angles of attack but ineffective at moderate angles. The noise reduction mechanisms are explored in each of three angle regimes.

TEM study of boron additions to cobalt aluminide

1988 ◽  
Vol 46 ◽  
pp. 546-547
Author(s):  
Gerald B. Feldewerth
Keyword(s):  
High Temperature ◽  
Turbine Engines ◽  
Major Drawback ◽  
University Of Missouri ◽  
Specific Strength ◽  
Aerospace Applications ◽  
Wide Range ◽  
Ordered Alloys ◽  
The University ◽  
Very High

In recent years an increasing emphasis has been placed on the study of high temperature intermetallic compounds for possible aerospace applications. One group of interest is the B2 aiuminides. This group of intermetaliics has a very high melting temperature, good high temperature, and excellent specific strength. These qualities make it a candidate for applications such as turbine engines. The B2 aiuminides exist over a wide range of compositions and also have a large solubility for third element substitutional additions, which may allow alloying additions to overcome their major drawback, their brittle nature.One B2 aluminide currently being studied is cobalt aluminide. Optical microscopy of CoAl alloys produced at the University of Missouri-Rolla showed a dramatic decrease in the grain size which affects the yield strength and flow stress of long range ordered alloys, and a change in the grain shape with the addition of 0.5 % boron.

Biodiversity in Vegetation and Ecosystems»: symposium on the occasion of the retirement of Prof. Dr. Fred J.A. Daniels (Munster, Germany, July 11, 2008)

2008 ◽  
pp. 123-124
Author(s):  
N. V. Matveyeva
Keyword(s):  
Wide Range ◽  
65Th Anniversary ◽  
The University

July 2008 in Münster (Germany) hosted a Symposium on the occasion of the 65th anniversary of Professor of the University of this city, Fred Daniels (Frederikus Josephus Alphonsus Daniëls). The title of this Symposium «Biodiversity in Vegetation and Ecosystems» reflected the wide range of interests of the celebrant.

Tassos Papacostas and Maria Parani (eds.), Discipuli dona ferentes. Glimpses of Byzantium in Honour of Marlia Mundell Mango. Β υζ ά ν τ ι ο ς. Studies in Byzantine History and Civilization 11. Turnhout: Brepols Publishers, 2017. XXX, 486, 111 b/w figures.

Mediaevistik ◽  
2020 ◽  
Vol 32 (1) ◽  
pp. 333-337
Author(s):  
Natalia Teteriatnikov
Keyword(s):  
Late Antiquity ◽  
Oxford University ◽  
Present Volume ◽  
Wide Range ◽  
Byzantine Period ◽  
The University ◽  
Vast Territory ◽  
Byzantine History

The present volume is a tribute to Marlia Mango on the occasion of her retirement from the University service of Kings College, Oxford University. All essays, written by her students, offer the result of their research and express a profound gratitude to their teacher. The essays tackle a wide range of subjects covering a vast territory from Constantinople to its periphery as well as Italy. Chronologically diverse, research materials span from late antiquity to the late Byzantine period.

scholarly journals Beyond cultural and geographical proximity: delving into the factors that influence the dynamics of academic relationships between students in higher education

2021 ◽  
Author(s):  
José-Vicente Tomás-Miquel ◽  
Jordi Capó-Vicedo
Keyword(s):  
University Students ◽  
Academic Research ◽  
Past Research ◽  
Academic Networks ◽  
Level Data ◽  
Wide Range ◽  
Specific Stage ◽  
The University ◽  
Proximity Dimensions ◽  
Shed Light

AbstractScholars have widely recognised the importance of academic relationships between students at the university. While much of the past research has focused on studying their influence on different aspects such as the students’ academic performance or their emotional stability, less is known about their dynamics and the factors that influence the formation and dissolution of linkages between university students in academic networks. In this paper, we try to shed light on this issue by exploring through stochastic actor-oriented models and student-level data the influence that a set of proximity factors may have on formation of these relationships over the entire period in which students are enrolled at the university. Our findings confirm that the establishment of academic relationships is derived, in part, from a wide range of proximity dimensions of a social, personal, geographical, cultural and academic nature. Furthermore, and unlike previous studies, this research also empirically confirms that the specific stage in which the student is at the university determines the influence of these proximity factors on the dynamics of academic relationships. In this regard, beyond cultural and geographic proximities that only influence the first years at the university, students shape their relationships as they progress in their studies from similarities in more strategic aspects such as academic and personal closeness. These results may have significant implications for both academic research and university policies.

scholarly journals Institutional Restructuring in Response to the Changing Mission of Land Grant Colleges Cook College, Rutgers University – The State University of New Jersey

1973 ◽  
Vol 2 (2) ◽  
pp. 297-304
Author(s):  
Daymon W. Thatch ◽  
William L. Park
Keyword(s):  
Higher Education ◽  
New Brunswick ◽  
Colonial America ◽  
Revolutionary War ◽  
The State ◽  
State University ◽  
Arts And Sciences ◽  
Rutgers University ◽  
Wide Range ◽  
The University

Rutgers University was chartered as Queen's College on November 10, 1766. It was the eighth institution of higher education founded in Colonial America prior to the Revolutionary War. From its modest beginning in the New Brunswick area the University has grown to eight separately organized undergraduate colleges in three areas of the State, with a wide range of offerings in liberal and applied arts and sciences.

Children and Youth With Fetal Alcohol Spectrum Disorders: Summary of Intervention Recommendations After Clinical Diagnosis

2010 ◽  
Vol 48 (5) ◽  
pp. 330-344 ◽  
Author(s):  
Tracy Jirikowic ◽  
Julie Gelo ◽  
Susan Astley
Keyword(s):  
Fetal Alcohol Spectrum Disorders ◽  
Clinical Sample ◽  
Demographic Variables ◽  
Children And Youth ◽  
Standards Of Care ◽  
Fetal Alcohol ◽  
Wide Range ◽  
Spectrum Disorders ◽  
The University ◽  
Fetal Alcohol Spectrum

Abstract Children with fetal alcohol spectrum disorders (FASDs) present with a wide range of developmental disabilities; however, clinical standards of care after a diagnosis are not well established. This retrospective review summarizes the types of intervention recommendations generated by an interdisciplinary FASD diagnostic team for 120 children ages 0.2 to 16.5 years receiving an FASD diagnosis at the University of Washington FAS Diagnostic & Prevention Network Clinic. Intervention recommendations documented in a FASD diagnostic summary report and submitted to each patient's medical record were subject to masked review and content analysis. Intervention recommendations were compared across 3 FASD diagnostic groups and selected demographic variables. The results show the type and frequency of services, supports, and resources recommended to a clinical sample of children with FASD.

Sources

1992 ◽  
Vol 14 (2) ◽  
pp. 40-42
Keyword(s):  
Problem Solving ◽  
Applied Anthropology ◽  
University Of Kentucky ◽  
Wide Range ◽  
Different Types ◽  
The University ◽  
Conference Papers

Sources documents the work of applied and practicing anthropologists. The Project Profiles published here are based on materials submitted to the Applied Anthropology Documentation Project at the University of Kentucky. The project, since its inception in 1978, has attempted to collect the so-called fugitive literature produced by anthropologists during their problem-solving work. The collection has a wide range of different types of materials: technical reports, research monographs, conference papers, practicum and internship reports, legal briefs, proposals, and other materials.

Prescribed burning for lowland black spruce regeneration in northern Minnesota

1984 ◽  
Vol 14 (1) ◽  
pp. 107-113 ◽  
Author(s):  
Scott E. Aksamit ◽  
Frank D. Irving
Keyword(s):  
Prescribed Burning ◽  
Black Spruce ◽  
Controlled Study ◽  
University Of Minnesota ◽  
Feather Moss ◽  
Wide Range ◽  
Labrador Tea ◽  
Tall Shrub ◽  
The University ◽  
Larger Sample

Concern over the variability of black spruce (Piceamariana (Mill.) B.S.P.) regeneration on peatlands in northern Minnesota following prescribed burning led to a cooperative study between the University of Minnesota and the Minnesota Department of Natural Resources. Twenty-seven black spruce cutovers on State lands that had been prescribed burned and either seeded or left to regenerate naturally were sampled. These were stratified into sphagnum – Labrador-tea – leather-leaf (SPHG) sites (10), feather moss (FM) sites (9), and alder – graminoid – other tall shrub (ALDR) sites (8). Results indicate that fire was not necessary to regenerate SPHG sites. FM sites required fire to modify unfavorable seedbeds and to reduce competition. Best results were obtained by burning when the upper layers of the peat were highly desiccated. ALDR sites occupied a wide range of ecological conditions which led to highly variable regeneration results. A larger sample size and possibly more carefully controlled study conditions are needed to fully understand ALDR site regeneration. Seeding results were uncertain for all sites.

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