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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 31 to 40 of 9018 (0.025 seconds)| 31 |
Impact Response and Failure of a Textile Composite Fuselage FramePilkington, Lawrence O. 12 August 2004 (has links)
Impact tests are performed on two circular circumferential frame segments using a drop tower apparatus. These frames have a nominal radius of 120 inches, a forty-eight - degree included angle, a thin-walled cross section in the shape of the letter J, and are typical of the transverse fuselage frames found in a large transport aircraft. The material is a 2D triaxial braided composite of carbon fiber yarns. Impact speeds of the 91.6 lb drop mass are 23.7 ft/s or less. This speed range is the order of the vertical speed considered in a survivable crash on a runway. Transient response characteristics and failure sequence are compared to nominally identical frames tested quasi-statically in a previous study. The peak load at the first major failure event and the corresponding displacement are larger in impact tests than in the quasi-static tests. However, the fracture sequence in the vicinity of the impact location is similar to what was observed in the static tests. Preliminary transient simulations of the frame impact tests using the LSDyna software were also performed. Using the available composite material failure criteria in the software, reasonable correlation was achieved between the simulation and the tests on the load-displacement plot. The computed strains distributions did not compare as well to the measured strains at the first major failure event. / Master of Science
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Pseudoconditioning of the GSRCook, Royer Frederick. January 1966 (has links)
LD2668 .T4 1966 C63 / Master of Science
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The cellular basis of immune responses to Heligmosomoides polygyrus in the mouseParker, Susan J. January 1988 (has links)
No description available.
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Investigations on the properties and estimation of earth response operators from EM sounding dataTzanis, Andreas January 1987 (has links)
No description available.
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Antigen presentation by the B cell antigen receptorPatel, Ketan Jayakrishna January 1994 (has links)
No description available.
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Studies on gene conversion as a mutational mechanism in the evolution of major histocompatibility complex genesLorenzi, Roberto January 1994 (has links)
No description available.
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Modulation of human dendritic cell function by microbial or autologous stimuliJohansson, Ulrika January 2002 (has links)
No description available.
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HIV diversity and the pathogenesis of AIDSPitman, Richard James January 1996 (has links)
No description available.
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Mediators of acute inflammation and their roles in modulating in vivo leukocyte infiltration and pathobiologic activity in the conjunctivaSpada, Clayton Samuel January 1989 (has links)
No description available.
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Correlation between muscle fibre characteristics and neuromuscular blockadeIbebunjo, Chikwendu January 1991 (has links)
No description available.
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