| Context Analysis and Principles Study. Phase 1 - Client Report (Part 1) Architecture Practice Study |
OCT 2000 |
|
| Authors:
P. Chen; A. El-Sakka; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION SALISBURY (AUSTRALIA) ELECTRONICS AND SURVEILLANCE RESEARCH
|
 | Large organizations are becoming increasingly dependent on the reliability, adaptability and interoperability of information-intensive systems to conduct their business operations successfully and profitably. These qualities are now prerequisite for organizations' survival in the ever-changing national and international markets. For the last two decades, architecture, despite its diverse definitions, has been considered by Information Technology (IT) practitioners and researchers, as playing critical roles during the life cycle of systems and their ... |
|
| A Framework Study for Australian Defence Organization (ADO) Architecture Practice. Phase 1 - Client Report (Part 2) Architecture Practice Study |
OCT 2000 |
|
| Authors:
P. Chen; G. Bulluss; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION SALISBURY (AUSTRALIA)
|
| Successful development and evolution of the Defense Information Environment requires the organization to develop an architectural culture in its Information Technology (IT) practice and future organization development. In such a culture, the organization must achieve an integrated architecture capability for high-level knowledge creation, management and reuse within its improved IT development capability. This report discusses the main issues facing the organization in developing such an integrated architecture capability, and proposes ... |
|
| Basic Studies of Nonlinear Optical Materials for Eye and Sensor Protection |
15 JAN 2000 |
34 pages |
| Authors:
P. M. Tentzepis; P. Chen; I. V. Tomov; A. S. Dvornikov; D. A. Oulianov; CALIFORNIA UNIV IRVINE DEPT OF CHEMISTRY
|
 | We have studied the basic spectroscopy, kinetics and nonlinear optical properties of a set of power limiting materials, which include six metallobenzoporphyrins and ten donor-acceptor azulenic molecules. These compounds are known to have highly polarizable it-electrons, and therefore are expected to have nonlinear coefficients suitable for utilization in optical limiting devices. In order to diagnose the optical limiting properties of the materials, we developed ... |
|
| X-Ray Diffraction Techniques and Finite Element Modeling to Control Residual Stress in High-Temperature Pressure Vessels |
NOV 1999 |
25 pages |
| Authors:
S. L. Lee; P. Chen; M. Leach; P. Cote; D. Windover; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET WEAPONS LAB
|
| Manufacturing operations, such as swage autofrettage, shot peening, and overload processes, have been used to impart advantageous residual stresses to improve fatigue life in components used in high-temperature pressure vessels. Both experimental and modeling techniques depend on the geometry and processing history of the component under investigation. This report compares x-ray diffraction residual stress measurements in a swage autofrettage steel cylinder with finite element modeling ... |
|
| Flying Laser Spot Thermal Wave IR Imaging |
92 |
|
| Authors:
Y. Q. Wang; P. Chen; P. K. Kuo; L. D. Favro; R. L. Thomas
|
| We report calculations of flying spot signal profiles with realistic geometry, and compare with experimental data. Example flying spot thermal wave images are also presented. The implications of the calculations for interpreting our images are discussed. (Author). |
|
| Infrared Thermal-Wave Studies of Coated Surfaces |
90 |
|
| Authors:
T. Ahmed; P. K. Kuo; L. D. Favro; H. J. Jin; P. Chen
|
| We describe the application of a pulsed heating and synchronous infrared thermal-wave detection technique to image sub-surface defects in a variety of plasma-sprayed coatings, composites, and rear-surface adhesive joints in metal and plastic panels. (Author). |
|
| Microstructure and Mechanical Properties of Rapidly Solidified and Annealed Ni-Al Intermetallic Alloys |
JUN 89 |
|
| Authors:
S. Nourbakhsh; P. Chen
|
| A series of rapidly solidified Ni-Al intermetallic alloys containing a nickel concentration in the range 61.3-76 at.% have been produced by the hammer and anvil technique. Electron metallography ductility and hardness measurements have been carried out to characterize the microstructure and mechanical properties of these alloys in both quenched and 1000 C annealed conditions. Rapid solidification, which has little effect on the composition at which gamma(Ni(sub 3)Al) first forms, shifts ... |
|
| Convergence of SIP (Strongly Implicit Procedure) |
MAY 1984 |
|
| Authors:
P. Chen; YALE UNIV NEW HAVEN CT DEPT OF COMPUTER SCIENCE
|
| We prove that the Strongly Implicit Procedure for solving self- adjoint elliptic difference equations is convergent. |
|
| Piezoelectricity in Nylon 11. |
01 APR 1980 |
|
| Authors:
B. A. Newman; P. Chen; K. D. Pae; J. I. Scheinbeim; RUTGERS - THE STATE UNIV PISCATAWAY NJ HIGH PRESSURE MATERIALS RESEARCH LAB
|
| At the present time, only poled, drawn poly(vinylidene fluoride) (PVF2) films give evidence of sufficiently high piezoelectric response to be useful in device applications, and for this reason the great majority of research has centered around this polymer. As in the case of PVF2, many of the odd nylons crystallize in a polar space group with a large net dipole moment in the unit cell. On the basis of the ... |
|
| Implementation of a Trapezoidal Ring Element in NASTRAN for Elastic-Plastic Analysis. |
DEC 1979 |
|
| Authors:
P. Chen; P. O'Hara; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND WATERVLIET NY LARGE CALIBER WEAPON SYSTEMS LAB
|
| The explicit expressions for an elastic-plastic trapezoidal ring element are presented and implemented in NASTRAN computer program. The material is assumed to obey the von Mises' yield criterion, isotropic hardening rule, and the Prandtl-Reuss flow relations. For the purpose of demonstration, two elastic-plastic problems are solved and compared with previous results. The first is a plane strain tube under uniform internal pressure and the second a finite-length tube loaded over ... |
|
| VACUUM EVAPORATED AND CATHODIC SPUTTERED THIN FILMS, |
MAR 1964 |
|
| Authors:
E. Krikorian; R. J. Sneed; P. Chen; B. Berson; GENERAL DYNAMICS/POMONA CALIF
|
| The effects of formation conditions on the epitaxial growth of thin films deposited by cathodic sputtering and vacuum evaporation are reported. The primary condition parameters considered are substrate temperature and rate of deposition. Trends have also been established for the effect of thickness, annealing and residual gas pressure. The results of a detailed investigation of Ge sputtered onto single crystal Ge, both (111) and (100), and (111) CaF2, are presented. ... |
|
Reports by Author
