Design of Propeller-Assisted Flapping Wing Air Vehicles for Enhanced Aerodynamic Performance

2015 ◽  
Author(s):  
Alex E. Holness ◽  
Hugh Bruck ◽  
S. K. Gupta
Keyword(s):  
Degrees Of Freedom ◽  
Aerodynamic Performance ◽  
Hybrid Vehicles ◽  
Biologically Inspired ◽  
University Of Maryland ◽  
Maryland College ◽  
Air Vehicle ◽  
Aircraft Performance ◽  
College Park ◽  
The University

Flapping flight is impressive because aerodynamic performance increases whereas fixed wing aircraft performance declines in low Reynolds regimes. In order to achieve biologically-inspired flapping, motion in multiple degrees of freedom is required and power density requirements must be satisfied. Given the mass of high output actuators, weight is a key limitation as it must be offset for flight. In light of this, only recently, with developments in motor technology, has independent wing control been achieved with consumer available components. Due to power demands, motor bandwidth is used largely to sustain flight, limiting the effect of wing independence. An interesting paradigm is one where the aerodynamic flight advantages of propeller-driven flight are utilized in addition to those of flapping wings to allow hybrid vehicles that can occupy unique operational bandwidth. In this work, a propeller-assisted version of Robo Raven, a miniature independent wing flapping air vehicle developed at the University of Maryland College Park, is presented. Having successfully flown with propeller assistance and having demonstrated improved force generation for aerodynamic performance over flapping alone, this modified Robo Raven will constitute the next major iteration of the vehicle as Robo Raven V.

Regional Specialization for Control of Ocular Movements in the Compound Eyes of a Stomatopod Crustacean

1992 ◽  
Vol 171 (1) ◽  
pp. 373-393 ◽  
Author(s):  
THOMAS W. CRONIN ◽  
HONG Y. YAN ◽  
KAY D. BIDLE
Keyword(s):  
Compound Eye ◽  
Compound Eyes ◽  
University Of Maryland ◽  
Regional Specialization ◽  
Ocular Movements ◽  
Maryland College ◽  
Ocular Tracking ◽  
College Park ◽  
Direct Tracking ◽  
The University

1. Regional specialization within the triple compound eyes of the gonodactyloid stomatopod Gonodactylus oerstedii (Hansen) was studied by examining how ocular tracking of a small target was affected after occluding vision in particular ommatidial regions with black enamel paint. 2. Complete occlusion of one eye did not prevent the other eye from tracking, indicating that the two eyes act somewhat independently. However, following such treatment, the angular extent over which the seeing eye moved while tracking was reduced. 3. An eye was able to continue tracking a moving target even after occlusion of the anterior tip or after painting over all of its posterior surface except the anterior tip (restricting the visual field to a patch about 40° in diameter). Similarly, occlusion of only the midband, the medial half or the lateral half of an eye did not prevent tracking. 4. Tracking was also possible, although with decreased amplitude, when either the dorsal or the ventral hemisphere was occluded. However, when both the dorsal and ventral hemispheres were occluded, leaving only the midband for vision, the ability of an eye to track was abolished. 5. A computer model was used to investigate whether the midband alone had the potential to direct tracking in our experiments. The model's output predicts that, in spite of its restricted field of view, if the midband is oriented within 20° of the horizontal, an eye could track using the midband alone. Conditions favoring such potential tracking occurred in our experiments, but neither tracking nor targetting movements were observed. 6. We conclude that ommatidia of the dorsal and ventral hemispheres of each compound eye are essential for ocular tracking in G. oerstedii. The midband appears to play no major role in this activity. Note: Present address: Department of Zoology, The University of Maryland College Park, College Park, MD 20742, USA.

scholarly journals Geographer, historian and classic French regionalist: The evolution of the writings of Jean Gottmann

2003 ◽  
Vol 70 (418/419) ◽  
pp. 13-18
Author(s):  
Robert A. Harper
Keyword(s):  
Professor Emeritus ◽  
National Council ◽  
Geographic Education ◽  
Past President ◽  
University Of Maryland ◽  
Maryland College ◽  
Peking University ◽  
College Park ◽  
The University ◽  
University Of Manchester

The author, Professor Emeritus of Geography, University of Maryland, College Park, holds four degrees from the University of Chicago and is the recipient of the University's Distinguished Alumnus award. A close associate of Jean Gottmann, he co-edited two volumes - Metropolis on the Move and Since Megalopolis with him. Harper's urban interest primarily concerns cities as central places and city networks. He also edited Modern Metropolitan Systems with Charles Christian. He has keen interest in geographic education. He is past president of the National Council for Geographic Education and recipient of their George J. Miller Award. He has written world geography texts for students from elementary school to college. He has been a visiting professor at the University of Manchester, University of Sydney, University of Durban-Westville, and Peking University.

scholarly journals Breaking Down Barriers Through the Creation of an International Digital Library for Children

2021 ◽  
Author(s):  
Ann Carlson Weeks ◽  
Allison Druin ◽  
Benjamin Bederson ◽  
Juan Pablo Hourcade ◽  
Anne Rose ◽  
...  
Keyword(s):  
Digital Library ◽  
The Internet ◽  
Ongoing Research ◽  
Internet Archive ◽  
University Of Maryland ◽  
Maryland College ◽  
Research Findings ◽  
The Creation ◽  
College Park ◽  
The University

A research project, begun in the fall of 2002, expects to tap the potential of the Internet for breaking down barriers and building tolerance and understanding through access to exemplary children’s books from all over the world. The creation of the International Children’s Digital Library (ICDL) is the focus of a five-year project being conducted by the University of Maryland/College Park and the Internet Archive with funding from the US National Science Foundation (NSF) and the Institute for Museum and Library Services (IMLS). This paper describes the project, discusses initial research findings and outlines the direction of ongoing research. Jessica Anthony, and Brewster Kahle

scholarly journals Book Review: Managing Copyright in Higher Education: A Guidebook

2015 ◽  
Vol 59 (4) ◽  
pp. 202
Author(s):  
Elsie Rodgers Halliday Okobi
Keyword(s):  
Higher Education ◽  
Information Needs ◽  
Law School ◽  
Library Science ◽  
University Of Maryland ◽  
University Culture ◽  
Maryland College ◽  
Copyright Information ◽  
College Park ◽  
The University

The author of Managing Copyright in Higher Education is uniquely qualified to tackle this topic. With a Doctor of Jurisprudence (JD) degree from Suffolk University Law School in Boston and a Master of Library Science (MLS) degree from University of Maryland College Park, Ms. Ferullo is the Director of the University Copyright Office at Purdue University, where she advises the University on copyright compliance issues. This book demonstrates Ms. Ferullo’s mastery of the legal and library science aspects of copyright; the book’s organization also shows her extensive knowledge of her audience and their copyright information needs. The text begins with an “introduction to intellectual property” and “copyright basics;” “the university culture;” followed by chapters on the role and establishment of a copyright office within the university; and concludes with chapters focusing on copyright services to librarians, faculty, administration and staff, and students. The organization of the book provides a logical progression of copyright issues in higher education in a straightforward style that can be readily understood by the novice and appreciated by the expert.

Race-Conscious Academic Policy in Higher Education: The University of Maryland Banneker Scholars Program

1997 ◽  
Vol 11 (4) ◽  
pp. 443-478
Author(s):  
Walter R. Allen ◽  
Darnell M. Hunt ◽  
Derrick I. M. Gilbert
Keyword(s):  
African Americans ◽  
Life Histories ◽  
Student Diversity ◽  
University Of Maryland ◽  
Maryland College ◽  
Scholarship Program ◽  
Constitutional Right ◽  
Group Interviews ◽  
College Park ◽  
The University

This research was undertaken in conjunction with the efforts of the University of Maryland-College Park to respond to litigation in the case of Podberesky v. Kirwan (1993). The case challenged the constitutional right of the university to operate a scholarship program reserved exclusively for high-achieving African Americans. This study offers a broad-based assessment of the Benjamin Banneker Scholars Program. The Banneker Scholars Program is a key element in the university's plan for desegregation and increased student diversity. The research was conducted in the summer and fall of 1992 using a variety of data sources: university records, personal interviews, survey questionnaires, telephone interviews, focus group interviews, and life histories. We found that the Banneker scholarship program continues to be necessary, as a specific remedy, to eliminate the effects of past, present, and cumulative discrimination against African Americans.

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