| NASA/DoD Aerospace Knowledge Diffusion Research Project. Paper 59. Japanese Technological Innovation - Implications for Large Commercial Aircraft and Knowledge Diffusion |
MAR 97 |
34 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; Mindy L. Kotler; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
 | This paper explores three factors-public policy, the Japanese (national) innovation system, and knowledge-that influence technological innovation in Japan. To establish a context for the paper, we examine Japanese culture and the U.S. and Japanese patent systems in the background section. A brief history of the Japanese aircraft industry as a source of knowledge and technology for other industries is presented. Japanese and U.S. alliances and linkages in three sectors-biotechnology, semiconductors, ... |
|
| Comparison of Separation Shock for Explosive and Nonexplosive Release Actuators on a Small Spacecraft Panel |
DEC 96 |
53 pages |
| Authors:
M. H. Lucy; R. D. Buehrle; J. P. Woolley; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| Functional shock, safety, overall system costs, and emergence of new technologies, have raised concerns regarding continued use of pyrotechnics on spacecraft. NASA Headquarters participated with Lockheed Martin Missile and Space Co. in objectively evaluating applicability of some non-explosive actuators (NEA) mechanisms to reduce small spacecraft and booster separation event shock. Comparative tests were conducted on a structural simulator using five different separation nut mechanisms consisting of three pyrotechnics. Multiple actuations ... |
|
| NASA/DOD Aerospace Knowledge Diffusion Research Project. Paper Fifty Eight - Survey of Reader Preferences Concerning the Format of NASA Langley- Authored Technical Reports. Paper Presented at Greyworks '96 - The Second U.S. Workshop on Grey Literature org |
18 NOV 96 |
22 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The U.S. government technical report is a primary means by which the results of federally funded research and development (R&D) are transferred to the U.S. aerospace industry. However, little is known about this information product in terms of its actual use, importance, and value in the transfer of federally funded R&D. Little is also known about the intermediary-based system that is used to transfer the results of federally funded R&D ... |
|
| Report on Alternative Devices to Pyrotechnics on Spacecraft |
SEP 96 |
20 pages |
| Authors:
M. Lucy; R. Hardy; E. Kist; J. Watson; S. Wise; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| Pyrotechnics accomplish many functions on today's spacecraft, possessing minimum volume/weight, providing instantaneous operation on demand, and requiring little input energy. However, functional shock, safety, and overall system cost issues, combined with emergence and availability of new technologies question their continued use on space missions. Upon request from the National Aeronautics and Space Administration's (NASA) Program Management Council (PMC), Langley Research Center (LaRC) conducted a survey to identify and evaluate state-of-the-art ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project. Report Number 47. Survey of Reader Preferences Concerning the Format of NASA Langley-Authored Technical Reports - Results of the Phase 1 Mail Survey |
AUG 96 |
48 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The U.S. government technical report is a primary means by which the results of federally funded research and development (R&D) are transferred to the U.S. aerospace industry. However, little is known about this information product in terms of its actual use, importance, and value in the transfer of federally funded R&D. Little is also known about the intermediary- based system that is used to transfer the results of federally funded ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project. Report Number 45. The Technical Communications Practices of U.S. Aerospace Engineers and Scientists: Results of the Phase 3 U.S. Aerospace Engineering Educators Survey |
JUL 96 |
52 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The U.S. government technical report is a primary means by which the results of federally funded research and development (R&D) are transferred to the U.S. aerospace industry. However, little is known about this information product in terms of its actual use, importance, and value in the transfer of federally funded R&D. To help establish a body of knowledge, the U.S. government technical report is being investigated as part of the ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project. Report Number 37. Factors Motivating and Impending Information-Seeking by Early Career-Stage U.S. Aerospace Engineers and Scientists - Results of an Initial Investigation |
JUL 96 |
37 pages |
| Authors:
Elizabeth W. Morrison; Thomas E. Pinelli; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| Selected results from an investigation that focused on the factors motivating and impeding information-seeking by early career-stage (i.e., new) U. S. aerospace engineers and scientists are reported. Undertaken as a Phase 1 activity of the NASA/DoD Aerospace Knowledge Diffusion Research Project, this initial investigation used mail (self-reported) surveys to collect data from 312 members of the American Institute of Aeronautics and Astronautics (AIAA) who had converted their AIAA memberships from ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project. Report 41. The Technical Communication Practices of U.S. Aerospace Engineers and Scientists: Results of the Phase 1 Mail Survey - Propulsion and Aircraft Engine Perspective |
JUL 96 |
53 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The U.S. government technical report is a primary means by which the results of federally funded research and development (R&D) are transferred to the U.S. aerospace industry. However, little is known about this information product in terms of its actual use, importance, and value in the transfer of federally funded R&D. Little is also known about the intermediary-based system that is used to transfer the results of federally funded R&D ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project. Report Number 39. The Technical Communication Practices of U.S. Aerospace Engineers and Scientists: Results of the Phase 1 Mail Survey - Avionics and Electrical Components and Subsystems Perspective |
JUL 96 |
53 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The U.S. government technical report is a primary means by which the results of federally funded research and development (R&D) are transferred to the U.S. aerospace industry. However, little is known about this information product in terms of its actual use, importance, and value in the transfer of federally funded R&D. Little is also known about the intermediary-based system that is used to transfer the results of federally funded R&D ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project. Report Number 44. The Technical Communication Practices of U.S. Aerospace Engineers and Scientists: Results of the Phase 1 Mail Survey - Structures and Materials Perspective |
JUL 96 |
52 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The U.S. government technical report is a primary means by which the results of federally funded research and development (R&D) are transferred to the U.S. aerospace industry. However, little is known about this information product in terms of its actual use, importance, and value in the transfer of federally funded R&D. Little is also known about the intermediary-based system that is used to transfer the results of federally funded R&D ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project. Report Number 40. The Technical Communication Practices of U.S. Aeorspace Engineers and Scientists: Results of the Phase 1 Mail Survey - Human Factors and Crew Integration Perspective |
JUL 96 |
53 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The U.S. government technical report is a primary means by which the results of federally funded research and development (R&D) are transferred to the U.S. aerospace industry. However, little is known about this information product in terms of its actual use, importance, and value in the transfer of federally funded R&D. Little is also known about the intermediary-based system that is used to transfer the results of federally funded R&D ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project. Report Number 43. The Technical Communication Practices of U.S. Aerospace Engineers and Scientists: Results of the Phase 1 Mail Survey - Manufacturing and Production Perspective |
JUL 96 |
52 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The U.S. government technical report is a primary means by which the results of federally funded research and development (R&D) are transferred to the U.S. aerospace industry. However, little is known about this information product in terms of its actual use, importance, and value in the transfer of federally funded R&D. Little is also known about the intermediary-based system that is used to transfer the results of federally funded R&D ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project. Report Number 42. The Technical Communication Practices of U.S. Aerospace Engineers and Scientists: Results of the Phase 1 Mail Survey - Aircraft Design Perspective |
JUL 96 |
52 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The U.S. government technical report is a primary means by which the results of federally funded research and development (R&D) are transferred to the U.S. aerospace industry. However, little is known about this information product in terms of its actual use, importance, and value in the transfer of federally funded R&D. Little is also known about the intermediary-based system that is used to transfer the results of federally funded R&D ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project. Report Number 38. The Technical Communication Practices of U.S. Aerospace Engineers and Scientists: Results of the Phase 1 Mail Survey - Flight Test Engineers Perspective |
JUL 96 |
52 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The U.S. government technical report is a primary means by which the results of federally funded research and development (R&D) are transferred to the U.S. aerospace industry. However, little is known about this information product in terms of its actual use, importance, and value in the transfer of federally funded R&D. Little is also known about the intermediary-based system that is used to transfer the results of federally funded R&D ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project. Report Number 46. The Technical Communication Practices of U.S. Aerospace Engineers and Scientists: Results of the Phase 1 Mail Survey - Service /Maintenance and Marketing/Sales Perspectives |
JUL 96 |
64 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The U.S. government technical report is a primary means by which the results of federally funded research and development (R&D) are transferred to the U.S. aerospace industry. However, little is known about this information product in terms of its actual use, importance, and value in the transfer of federally funded R&D. Little is also known about the intermediary-based system that is used to transfer the results of federally funded R&D ... |
|
| Thermoplastic Ribbon-Ply Bonding Model |
JAN 96 |
61 pages |
| Authors:
Jeffrey A. Hinkley; Joseph M. Marchello; Bernadette C. Messier; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| With thermoplastic matrix resins, on-line consolidation of continuous-fiber composite laminates offers the potential of eliminating the post-placement autoclave or oven curing step, thereby simplifying the process and reducing costs. The aim of the present work was to identify key variables in rapid weld-bonding of thermoplastic tow (ribbon) and their relationship to matrix polymer properties and to ribbon microstructure. Theoretical models for viscosity, establishment of ply-ply contact, instantaneous (Velcro) bonding, molecular ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project. Report Number 36. The Technical Communications Practices of U.S. Aerospace Engineers and Scientists: Results of the Phase 1 NASA Langley Research Center Mail Survey |
NOV 95 |
52 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The U.S. government technical report is a primary means by which the results of federally funded research and development (R&D) are transferred to the U.S. aerospace industry. However, little is known about this information product in terms of its actual use, importance, and value in the transfer of federally funded R&D. Little is also known about the intermediary-based system that is used to transfer the results of federally funded R&D ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project. Report Number 33. The Technical Communications Practices of U.S. Aerospace Engineers and Scientists: Results of the Phase 1 AIAA Mail Survey |
SEP 95 |
52 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The U.S. government technical report is a primary means by which the results of federally funded research and development (R&D) are transferred to the U.S. aerospace industry. However, little is known about this information product in terms of its actual use, importance, and value in the transfer of federally funded R&D. Little is also known about the intermediary-based system that is used to transfer the results of federally funded R&D ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project. Report Number 34. How Early Career-Stage U.S. Aerospace Engineers and Scientists Produce and Use Information |
SEP 95 |
50 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The U.S. government technical report is a primary means by which the results of federally funded research and development (R&D) are transferred to the U.S. aerospace industry. However, little is known about this information product in terms of its actual use, importance, and value in the transfer of federally funded R&D. Little is also known about the intermediary-based system that is used to transfer the results of federally funded R&D ... |
|
| NASA/DOD/ARPA Advanced Composites Technology Conference (6th) Held at Anaheim, California on 7-11 August 1995. Agenda and Registration |
11 AUG 95 |
27 pages |
| Authors:
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The Sixth NASA/DOD/ARPA Advanced Composites Technology Conference is sponsored by the NASA Langley Research Center and the USAF Wright Laboratory to review recent advances in research and development of composites technology for application to military and commercial aircraft. The NASA Advanced Composites Technology (ACT) Program is a major multi-year research initiative to achieve a national goal of technology readiness early in the next decade. The Wright Laboratory Design and Manufacturing ... |
|
| On The Utility of Threads for Data Parallel Programming |
MAY 95 |
15 pages |
| Authors:
Thomas Fahringer; Matthew Haines; Piyush Mehrotra; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| Threads provide a useful programming model for asynchronous behavior because of their ability to encapsulate units of work that can then be scheduled for execution at runtime, based on the dynamic state of a system. Recently, the threaded model has been applied to the domain of data parallel scientific codes, and initial reports indicate that the threaded model can produce performance gains over non-threaded approaches, primarily through the use of ... |
|
| A Comparison of the Technical Communications Practices of Japanese and U.S. Aerospace Engineers and Scientists. NASA/DoD Aerospace Knowledge Diffusion Research Project |
DEC 94 |
54 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| As part of Phase 4 of the NASA/DoD Aerospace Knowledge Difffusion Research Project, two studies were conducted that investigated the technical communications practices of Japanese and U.S. aerospace engineers and scientists. Both studies have the same seven objectives: first, to solicit the opinions of aerospace engineers and scientists regarding the importance of technical communications to their profession; second, to determine the use and production of technical communications by aerospace engineers ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project. The Technical Communication Practices of Aerospace Engineering Students: Results of the Phase 3 AIAA National Student Survey. Report Number 26 |
DEC 94 |
59 pages |
| Authors:
Thomas E. Pinelli; Laura M. Hecht; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| This report describes similarities and differences between undergraduate and graduate engineering students in the context of two general aspects of the educational experience. First, we explore the extent to which students differ regarding the factors that lead to the choice of becoming an engineer, current satisfaction with that choice, and career-related goals and objectives. Second, we look at the technical communication practices, habits, and training of aerospace engineering students. The ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project. Report Number 27. The Technical Communication Practices of Engineering and Science Students: Results of the Phase 3 Academic Surveys |
DEC 94 |
91 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; Laura M. Hecht; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| This report describes similarities and differences between undergraduate and graduate engineering science students in the context of two general aspects of the educational experience. First, we explore the extent to which students differ regarding the factors that lead to the choice of becoming an engineer or a scientist, current satisfaction with that choice, and career- related goals and objectives. Second, we look at the technical communication practices, habits, and training ... |
|
| The Technical Communications Practices of U.S. Aerospace Engineers and Scientists: Results of the Phase 1 SME Mail Survey |
DEC 94 |
52 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The U.S. government technical report is a primary means by which the results of federally funded research and development (R&D) are transferred to the U.S. aerospace industry. However, little is known about this information product in terms of its actual use, importance, and value in the transfer of federally funded R&D. To help establish a body of knowledge, the U.S. government technical report is being investigated as part of the ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project. The Technical Communication Practices of Aerospace Engineering and Science Students: Results of the Phase 4 Cross-National Surveys |
DEC 94 |
88 pages |
| Authors:
Thomas E. Pinelli; Laura M. Hecht; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| This report describes similarities and differences between undergraduate and graduate aerospace engineering and science students in the context of two general aspects of the educational experience. First, we explore the extent to which students differ regarding the factors that lead to the choice of becoming an aerospace engineer or a scientist, current satisfaction with that choice, and career-related goals and objectives. Second, we look at the technical communication skills, practices, ... |
|
| Effective Declutter of Complex Flight Displays Using Stereoptic 3-D cueing |
APR 94 |
25 pages |
| Authors:
Russell V. Parrish; Steven P. Williams; Dean E. Nold; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| This application of stereo technology to new, integrated pictorial display formats has been effective in situational awareness enhancements, and stereo has been postulated to be effective for the declutter of complex informational displays. This paper reports a full-factorial workstation experiment performed to verify the potential benefits of stereo cueing for the declutter function in a simulated tracking task. The experimental symbology was designed similar to that of a conventional flight ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project. Report Number 23. U.S. Academic Librarians and Technical Information Specialists as Information Intermediaries: Results of the Phase 3 Study |
MAR 94 |
62 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The U.S. government technical report is a primary means by which the results of federally funded research and development (R&D) are transferred to the U.S. aerospace industry. However, little is known about this information product in terms of its actual use, importance, and value in the transfer of federally funded R&D. Little is also known about the intermediary-based system that is used to transfer the results of federally funded R&D ... |
|
| Algorithms for Digital Micro-Wave Receivers and Optimal System Identification |
28 FEB 94 |
119 pages |
| Authors:
Arnab K. Shaw; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The research in the Year-1 of this project has focused on two primary directions, as originally, proposed, (i) Advanced signal processing algorithms for digital microwave receivers with Electronic Warfare applications: For estimating the Angles-Of-Arrival or Radio Frequencies, a significant contribution has been made with a computationally efficient Minimum-Norm Method that does not require any Eigenanalysis but produces equally good estimates. A Maximum-Likelihood Estimator (MLE) that ensures unit circle frequencies has ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project. Report Number 21. U.S. Aerospace Industry Librarians and Technical Information Specialists as Information Intermediaries: Results of the Phase 2 Survey |
FEB 94 |
66 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The U.S. government technical report is a primary means by which the results of federally funded research and development (R and D) are transferred to the U.S. aerospace industry. However, little is known about this information product in terms of its actual use, importance, and value in the transfer of federally funded R and D. To help establish a body of knowledge, the U.S. government technical report is being investigated ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project Number 20. The Use of Selected Information Products and Services by U.S. Aerospace Engineers and Scientists: Results of Two Surveys |
FEB 94 |
62 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The U.S. government technical report is a primary means by which the results of federally funded research and development (R and D) are transferred to the U.S. aerospace industry. However, little is known about this information product in terms of its actual use, importance, and value in the transfer of federally funded R and D. To help establish a body of knowledge, the U.S. government technical report is being investigated ... |
|
| A Computer Program to Obtain Time-Correlated Gust Loads for Nonlinear Aircraft Using the Matched-Filter-Based Method |
FEB 94 |
46 pages |
| Authors:
Robert C. Scott; Anthony S. Pototzky; Boyd Perry III; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| NASA Langley Research Center has, for several years, conducted research in the area of time-correlated gust loads for linear and nonlinear aircraft. The results of this work led NASA to recommend that the Matched- Filter-Based One-Dimensional Search Method be used for gust load analyses of nonlinear aircraft. This manual describes this method, describes a FORTRAN code which performs this method, and presents example calculations for a sample nonlinear aircraft model. ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project. Report Number 19. The U. S. Government Technical Report and the Transfer of Federally Funded Aerospace R&D: An Analysis of Five Studies |
JAN 94 |
115 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The U.S. government technical report is a primary means by which the results of federally funded research and development (R&D) are transferred to the U.S. aerospace industry. However, little is known about this information product in terms of its actual use, importance, and value in the transfer of federally funded R&D. To help establish a body of knowledge, the U.S. government technical report is being investigated as part of the ... |
|
| Sulfur Segregation in Titanium and Selected Titanium Alloys |
1994 |
|
| Authors:
R. A. Outlaw; W. S. Lee; S. J. Hoekje; S. N. Sandaran; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
 | This paper concerned metals in some important way and contained information about, utilized, or discussed these subjects: basic topics: experimental materials and material types: ti-14al-21nb, ti-15mo-3nb-3al, ti- 33al-6nb-1ta, beta 21s materials related terms: aluminum addition, auger electron spectroscopy, carbon addition, electron energy loss spectroscopy, equiaxed grain, grain boundary, molybdenum addition, niobium addition, oxygen addition, sputtering, sulfur addition, tantalum addition parameter values relevant to the data: temp 0 to 99 c, ... |
|
| The Growth of Small Corrosion Fatigue Cracks in Alloy 2024 |
1994 |
|
| Authors:
R. S. Piascik; S. A. Willard; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| This paper concerned metals in some important way and contained information about, utilized, or discussed these subjects: basic topics: experimental materials and material types: aa 2024-t3 materials related terms: corrosion fatigue, crack growth rate, fatigue crack growth, grain size, intergranular fracture, microcracking, optical microscopy, pitting corrosion, sem, transgranular fracture, x-ray analysis testing and test conditions: cyclic loading, salt water environment, miscellaneous and special technical terms: aluminum alloys. |
|
| Oxidation of Ti-14Al-21Nb in Air and Oxygen from 700 to 1000 Degrees C |
1994 |
|
| Authors:
T. A. Wallace; R. K. Clark; K. E. Wiedemann; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The oxidation behavior of ti-14al-21nb in air and in oxygen was determined over the temperature range 700 to 1000 degrees c. weight gains in both atmospheres were measured using thermogravimetric analysis. the resulting oxidation products were identified using x-ray diffraction, and oxide morphology was evaluated using electron microscopy and wavelength-dispersive x-ray analysis. total weight gains in oxygen were up to four times higher than in air, and a higher percentage ... |
|
| Prediction of Thermal and Mechanical Stress-Strain Responses of TMC's Subjected to Complex TMF Histories. |
1994 |
|
| Authors:
W. S. Johnson; M. Mirdamadi; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| This paper concerned mmc in some important way and contained information about, utilized, or discussed these subjects: basic topics:, analytical, cr mmc, data, experimental, mmc, mmc data, reinforcement data materials and material types:, (0/90)2s layups, fibers, laminates, scs-6 fibers, scs-6/ti, scs-6/ti-15-3, sic/ti, sic/ti-15-3, ti matrix, ti-15-3 matrix material characteristics and data fields:, fiber data, fiber strength data, strain data, stress-strain data, stress-strain responses, thermal stress parameter values relevant to the ... |
|
| ASTM and VAMAS Activities in Titanium Matrix Composites Test Methods Development. |
1994 |
|
| Authors:
W. S. Johnson; D. M. Harmon; P. A. Bartolotta; S. M. Russ; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| This paper concerned mmc in some important way and contained information about, utilized, or discussed these subjects: basic topics:, data, mmc, mmc data, program reviews, review materials and material types:, (sic)f/beta 21s, (sic)f/ti, beta 21s matrix, fibers, laminates, scs-6 fibers, scs-6/beta 21s, scs-6/ti, sic/beta 21s, sic/ti, ti matrix material characteristics and data fields:, elongation data, fatigue behaviors, modulus data, uts data parameter values relevant to the data:, 0 c - ... |
|
| A Comparison of Various Micromechanics Models for Metal Matrix Composites. |
1994 |
|
| Authors:
C. A. Bigelow; W. S. Johnson; R. A. Naik; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| Four micromechanics models currently used in the analysis of metal matrix composites are reviewed. the four models are the vanishing fiber diameter model, the aboudi model, the multi-cell model, and discrete fiber-matrix model. results predicted by computer programs based on each of the models are compared. comparisons are made for the laminate properties and laminate stress-strain behavior for boron/aluminum and silicon-carbide/titanium composites. the predictions of constituent stresses are also compared. ... |
|
| Discrete-Time Model Reduction in Limited Frequency Ranges. |
DEC 1993 |
|
| Authors:
L. G. Horta; J. N. Juang; R. W. Longman; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| A mathematical formulation for model reduction of discrete-time systems such that the reduced-order model represents the system in a particular frequency range is discussed. The algorithm transforms the full-order system into balanced coordinates using frequency-weighted discrete controllability and observability grammians. In this form a criterion is derived to guide truncation of states based on their contribution to the frequency range of interest. Minimization of the criterion is accomplished without need ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project. Paper Thirty Three. Technical Communications Practices and the Use of Information Technologies as Reported by Dutch and U.S. Aerospace Engineers |
OCT 93 |
7 pages |
| Authors:
Rebecca O. Barclay; Thomas E. Pinelli; Axel S. Tan; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| As part of Phase 4 of the NASA/DOD Aerospace Knowledge Diffusion Research Project, two studies were conducted that investigated the technical communications practices of Dutch and U.S. aerospace engineers and scientists. A self-administered questionnaires was distributed to aerospace engineers and scientists at National Aerospace Laboratory (The Netherland) and NASA Ames Research Center (U.S.), and the NASA Langley Research Center (U.S.). This paper presents responses of the Dutch and U.S. participants ... |
|
| NASA/DoD Aerospace Knowledge Diffusion Research Project. Paper Thirty Two. A New Era in International Technical Communication: American-Russian Collaboration |
OCT 93 |
6 pages |
| Authors:
Madelyn Flammia; Rebecca O. Barclay; Thomas E. Pinelli; Michael L. Keene; Robert H. Burger; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| Until the recent dissolution of the Soviet Union, the Communist Party exerted a strict control of access to and dissemination of scientific and technical information (STI). This article presents models of the Soviet-style information society and the Western-style information society and discusses the effects of centralized governmental control of information on Russian technical communication practices. The effects of political control on technical communication are then used to interpret the results ... |
|
| Estimation of Kalman Filter Gain from OUtput Residuals. |
OCT 1993 |
|
| Authors:
J. N. Juang; C. W. Chen; M. Phan; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| This paper presents a procedure to estimate the Kalman filter gain from input-output measurement data with a given system model. The system model can be a finite element model or an experimental model from any identification method. The procedure consists of three basic steps. First, the stochastic portion related to the residuals of the response is computed. Second, the coefficients of a linear difference model for the stochastic portion are ... |
|
| NASA/DOD Aerospace Knowledge Diffusion Research Project. Report Number 18. A Comparison of the Technical Communication Practices of Aerospace Engineers and Scientists in India and the United States |
SEP 93 |
70 pages |
| Authors:
Thomas E. Pinelli; Rebecca O. Barclay; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| As part of Phase 4 of the NASA/DoD Aerospace Knowledge Diffusion Research Project, two Studies were conducted that investigated the technical communications practices of India and U.S. aerospace engineers and scientists. Both studies have the same seven objectives: first, to solicit the opinions of aerospace engineers and scientists regarding the importance of technical communications to their profession; second, to determine the use and production of technical communications by aerospace engineers ... |
|
| Pseudo-Compressibility Methods for the Incompressible Flow Equations |
SEP 93 |
16 pages |
| Authors:
Eli Turkel; A Arnone; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| We consider preconditioning methods to accelerate convergence to a steady state for the incompressible fluid dynamic equations. The analysis relies on the inviscid equations. The preconditioning consists of a matrix multiplying the time derivatives. Thus the steady state of the preconditioned system is the same as the steady state of the original system. We compare our method to other types of pseudo-compressibility. For finite difference methods preconditioning can change and ... |
|
| Technical Uncertainty and Project Complexity as Correlates of Information Use by U.S. Industry-Affiliated Aerospace Engineers and Scientists: Results of an Exploratory Investigation |
SEP 93 |
70 pages |
| Authors:
Thomas E. Pinelli; Nanci A. Glassman; Linda O. Affelder; Laura M. Hecht; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| An exploratory study was conducted that investigated the influence of technical uncertainty and project complexity on information use by U.S. industry-affiliated aerospace engineers and scientists. The study utilized survey research in the form of a self-administered mail questionnaire. U.S. aerospace engineers and scientists on the Society of Automotive Engineers (SAE) mailing list served as the study population. The adjusted response rate was 67 percent. The survey instrument is appendix C ... |
|
| A Data Distributed Parallel Algorithm for Ray-Traced Volume Rendering |
AUG 93 |
30 pages |
| Authors:
Kwan-Liu Ma; James S. Painter; Charles D. Hansen; Michael F. Krogh; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| This paper presents a divide-and-conquer ray-traced volume rendering algorithm and a parallel image compositing method, along with their implementation and performance on the Connection Machine CM-5, and networked workstations. This algorithm distributes both the data and the computations to individual processing units to achieve fast, high-quality rendering of high- resolution data. The volume data, once distributed, is left intact. The processing nodes perform local raytracing of their subvolume concurrently. No ... |
|
| International Laser Radar Conference (16th) held at Cambridge, Massachusetts on 20-24 July 1992. Part 1 |
24 JUL 93 |
248 pages |
| Authors:
M. P. McCormick; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| Topics covered include: the worldwide measurements of aerosols produced from the June 1991 eruption of the Pinatubo volcano; the role of lidars in global change research, including long-term stratospheric ozone measurements and the Network for the Detection of Stratospheric Change (NDSC); measurements from space by the Laser Atmospheric Winds Sensor (LAWS) and the Lidar in-space Technology Experiment (LITE); stratospheric and mesopheric temperature and wind measurements; mesopheric sodium and ion measurements; ... |
|
| A Comparison of the Technical Communications Practices of Dutch U.S. Aerospace Engineers and Scientists. Number 17 |
JUL 93 |
69 pages |
| Authors:
Rebecca O. Barclay; Thomas E. Pinelli; John M. Kennedy; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| As part of Phase 4 of the NASA/DoD Aerospace Knowledge Diffusion Research Project, two studies were conducted that investigated the technical communications practices of Dutch and U.S. aerospace engineers and scientists. Both studies have the same seven objectives: first, to solicit the opinions of aerospace engineers and scientists regarding the importance of technical communications to their profession; second, to determine the use and production of technical communications by aerospace engineers ... |
|
| Canonical Forms of Multidimensional Steady Inviscid Flows |
JUN 93 |
12 pages |
| Authors:
Shlomo Ta'asan; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| Canonical forms and canonical variables for inviscid flow problems are derived. In these forms the components of the system governed by different types of operators (elliptic and hyperbolic) are separated. Both the incompressible and compressible cases are analyzed and their similarities and differences are discussed. The canonical forms obtained are block upper triangular operator form in which the elliptic and non-elliptic parts reside in different blocks. The full nonlinear equations ... |
|
Reports by Corporate Author
