| Engineered Film Surfaces Via Spontaneous Phase Segregation |
DEC 2004 |
9 pages |
| Authors:
Joshua A. Orlick; Manhew S. Bratcher; Robert E. Jensen; Wendy E. Kosik; Steven H. McKnight; Heidi L. Schreuder-Gibson; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD MULTIFUNCTIONAL MATERIALS BRANCH
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 | A series of hyperbranched materials have been developed that allow for the transportation of desired functional groups to the surface of a polymer blend by simple solution casting techniques. These materials have been employed to transport polyoxometalates, or POMs, to the surface of a polyurethane- polyether copolymer film. providing for a 10x increase in POM concentration at the surface compared to the bulk. The films were evaluated using x-ray photoelectron ... |
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| Hybrid Fiber Sizings for Enhanced Energy Absorption in Glass-Reinforced Composites |
JUL 2004 |
45 pages |
| Authors:
Robert E. Jensen; Steven H. McKnight; Dave P. Flanagan; Alan R. Teets; Donovan Harris; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| Achieving high-impact energy absorption without loss of structural performance in a glass fiber-reinforced composite can be obtained through a materials by design approach of the fiber matrix interphase through modification of current commercially formulated silane-based fiber-sizing packages. In this report, we document the structural and impact performance of composites produced using a fiber-sizing package designed to provide strong fiber-matrix bonding at low-impact rates and weak fiber-matrix bonding at high-impact rates. ... |
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| Prediction of the Formulation Dependence of the Glass Transition Temperature for Amine-Epoxy Copolymers Using a Quantitative Structure-Property Relationship Based on the AM1 Method |
FEB 2004 |
30 pages |
| Authors:
Jason A. Morrill; Robert E. Jensen; Phillip H. Madison; Cary F. Chabalowski; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| A designer Quantitative Structure-Property Relationsbip (QSPR) based upon molecular properties calculated using the AM1 semi-empirical quantum mechanical metbod was developed to predict the glass transition temperature (Tg) of an%ine-cured epoxy resins based on tbe diglycidyl etber of bisphenol A. The QSPR (R2 - 0.9977) was generated using the regression analysis progran% Con%prebensive Descriptors for Structural and Statistical Analysis (CODESSA). By applying an ad hoc treatn%ent based on elen%entary probability fl%eory ... |
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| Viscoelastic Properties of Alkoxy Silane-Epoxy Interpenetrating Networks |
NOV 2003 |
40 pages |
| Authors:
Robert E. Jensen; Steven H. McKnight; Giuseppe R. Palmese; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| A model epoxy-silane interpenetrating network (IPN) was synthesized to simulate the molecular structure found at the fiber-matrix interphase. The Young's modulus (E) of the epoxy-silane IPN was determined% trough micromechanical analysis both quasi-statically and in the frequency domain. The epoxy-silane IPN was synthesized by diffusion of uncured diglycidyl ether of bisphenol A (DGEBA) epoxy resin and bis (p-aminocyclohexyl) methane (PACM) curing agent into spherical particles of condensed and crosslinked 3- ... |
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| Characterization of Low Density Glass Filled Epoxies |
MAR 2003 |
28 pages |
| Authors:
Matthew J. Quesenberry; Phillip H. Madison; Robert E. Jensen; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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| This report discusses the experimental determination and modeling of several thermophysical and mechanical properties of glass filled epoxy composite systems for potential use as electronic potting compounds. Resin systems containing diglycidyl ether of bisphenol A epoxy, dicyandiamide curing agent, and 2-methylimidazole catalyst were produced with three different combinations of fillers: (1) solid glass spheres, (2) hollow glass spheres, and (3) mixed solid-hollow glass spheres. The density (p), coefficient of thermal ... |
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| Dynamic Mechanical Analysis of E-Beam and Thermally Curable IPN thermosets |
MAR 2002 |
42 pages |
| Authors:
Robert E. Jensen; Giuseppe R. Palmese; Steven H. McKnight; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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| Interpenetrating polymer network (IPN) materials possess unique properties that can be exploited for multicomponent composite armor systems, including toughness and thermal stability. E-beam curing of composites and adhesives offers advantages, such as reduced cure shrinkages, over traditional autoclave processing by curing multiple resins through the thickness for thick- section composites in a single step. Because of the complexity and thickness of composite integral armor structures, e-beam curing is an attractive ... |
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| Strength and Durability of Glass Fiber Composites Treated With Multicomponent Sizing Formulations |
JAN 2002 |
38 pages |
| Authors:
Robert E. Jensen; Steven H. McKnight; Matthew J. Quesenberry; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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| Commercial fiber-sizing packages have been developed to enhance the strength and moisture resistance of composite materials, which typically decreases ballistic performance. Potential sizing packages developed for Future Combat Systems will need to enhance ballistic response while maintaining the levels of durability currently benchmarked by existing commercial systems. For this research, pultruded vinyl ester/E-glass composites were manufactured in which the silane, film former resin, and surfactant reactivity were varied to mimic ... |
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| Migration of WAM to Scalable Computing Environments |
SEP 97 |
40 pages |
| Authors:
John E. West; Robert E. Jensen; Louis H. Turcotte; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS INFORMATION TECHNOLOG Y LAB
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| Recent reviews in Department of Defense (DoD) strategic interests place additional emphasis on near-shore or littoral operations. This has created a significant Army interest in coastal wave predictions for sustainment of operations and has significantly increased the Navy's needs for improved coastal wave predictions. Both services use a European-developed code called the WAve Model, or WAM for oceanic wave prediction. Although initially developed for deep ocean global forecasts research indicates ... |
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| Developing a Joint Army/Navy Coastal Wave Prediction Program. A Planning Report |
15 MAY 96 |
103 pages |
| Authors:
Ming-Yang Su; Y. L. Hsu; C. L. Vincent; Robert E. Jensen; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEAN SCIENCES BRANCH
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| This planning report presents a technical summary and recommendations for jointly developing improved coastal wave prediction capabilities for the Army and Navy, and was prepared by the Army/Navy Wave Prediction Group. Wave related physical processes are crucial for both Army and Navy operations, such as mine, amphibious, and logistics over the shore. Current coastal wave prediction capabilities are inadequate to meet several critical nearshore operational requirements. Nearshore physical environments are ... |
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| Observations and Modelling of Winds and Waves During the Surface Wave Dynamics Experiment. Report 2. Intensive Observation Period IOP-3, 25 February-9 March 1991 |
MAR 94 |
291 pages |
| Authors:
Michael J. Caruso; Hans C. Graber; Robert E. Jensen; Mark A. Donelan; COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS
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| This report describes the compilation of observed and modelled wind, wave and current parameters during the third intensive observation period (IOP- 3) from February 25 to March 9, 1991, of the Surface Wave Dynamics Experiment. The measurements include wind speed and direction, wave heights and periods, air and sea temperatures, and atmospheric pressures from four directional wave buoys, two meteorological buoys, and several routinely operated buoys from the National Data ... |
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| Observations and Modelling of Winds and Waves during the Surface Wave Dynamics Experiment. Report 1. Intensive Observation Period IOP-1, 20-31 October 1990 |
APR 93 |
200 pages |
| Authors:
Michael J. Caruso; Hans C. Graber; Robert E. Jensen; Mark A. Donelan; COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS
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| This report describes the compilation of observed and modelled wind and wave parameters during the first intensive observation period (IOP-1) from October 20-31, 1991, of the Surface Wave Dynamics Experiment. The measurements include wind speeds and directions, wave heights and periods, air and sea temperatures, and atmospheric pressures from three directional wave buoys, four meteorological buoys, and several routinely operated buoys from the National Data Buoy Center (NDBC). In addition, ... |
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| Comparison of Atlantic Coast Wave Information Study Hindcasts with Field Research Facility Gage Measurements |
OCT 90 |
36 pages |
| Authors:
Herman C. Miller; Robert E. Jensen; COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS
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| This report compares summaries of the 1956-1975 Atlantic coast Phase III shallow-water WIs estimates with two measured data sets from the Coastal Engineering Research Center's Field Research Facility (FRF) at Duck, NC. The first consists of 5 years of energy spectra from a Waverider buoy, while the second is 1 year of directional spectra from a high-resolution linear array. Results of the study provide the engineer with a clear understanding ... |
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| Directional Spectral Wave Transformation in the Nearshore Region. Report 1. Directional Spectral Performance Characteristics |
NOV 89 |
180 pages |
| Authors:
Michael J. Briggs; Peter J. Grace; Robert E. Jensen; COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS
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| The effects of frequency and directional spreading on wave transformation in the nearshore region were investigated using a three- dimensional physical model of Yaquina Bay, Oregon. The 1:45 model consists of an entrance channel protected by two rubble-mound jetties with a sloping bottom and submerged reef offshore of the entrance. Unidirectional and directional wave spectra, representative of the six most severe hindcasted storms in the past 20 years, were numerically ... |
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| Pacific Coast Hindcast Phase 3 North Wave Information |
MAR 89 |
608 pages |
| Authors:
Robert E. Jensen; Jon M. Hubertz; Jane B. Payne; COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS
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| Twenty years of hindcast significant height, peak period, and mean direction wave information is summarized for 134 Pacific locations in four data products: a) percent occurrence tables; b) wave rose diagrams; c) mean and largest significant height and 20-year statistics tables; and d) return period tables. Brief descriptions and examples for each data product are provided. |
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| A User's Guide to SHALWV (Shallow-Water Wave): Numerical Model for Simulationof Shallow-Water Wave Growth, Propagation, and Decay. Report. 2. SHALWV--Hurricane Wave Modeling and Verification |
JUN 87 |
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| Authors:
Robert E. Jensen; Charles L. Vincent; Charles E. Abel; COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS
|
 | This report is the second in a series of user's guides to SHALW, a numerical model that simulates shallow-water wave growth, propagation, and decay in a directional spectrum over an arbitrary bathymetry. The original report (Instruction Report CERC-86-2) was titled 'A User's Guide to SHALWV: Numerical Model for Simulation of Shallow-Water Wave Growth Propagation, and Decay'. Future enhancements to the model will be added to the series. The report herein ... |
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| Sloping Float Breakwater Study Oregon Inlet, North Carolina, Coastal Model Investigation |
APR 87 |
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| Authors:
Robert D. Carver; Dennis G. Markle; Willie G. Dubose; Robert E. Jensen; COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS
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| Two-dimensional (2-D) and three dimensional (3-D) hydraulic model investigations were conducted at an undistorted linear scale of 1:25 (model to prototype) to acquire data on transmitted wave heights, mooring line forces, intermodule connector forces, bottom impact velocities, and barge angularities as a function of wave climate. These data were needed as input to optimize the design of the sloping float breakwater (SFB) concept whose function would be to protect floating ... |
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| A User's Guide to SHALWV: Numerical Model for Simulation of Shallow- Water Wave Growth, Propagation, and Decay |
JUN 86 |
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| Authors:
Steven A. Hughes; Robert E. Jensen; COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS
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| SHALWV is a numerical model that simulates shallow-water wave growth, propagation, and decay in a directional spectrum over an arbitrary bathymetry. It is a time-dependent model requiring a primary input of the wind speed and wind direction at each grid point. Part I of this report contains an overview of SHALWV consisting of the model description, the theoretical background, and the model applications and limitations. Part II provides the information ... |
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| Wave Data Acquisition and Hindcast for Saginaw Bay, Michigan |
JUN 1983 |
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| Authors:
Andrew W. Garcia; Robert E. Jensen; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS HYDRAULICS LAB
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| A wave-measurement system was deployed in Saginaw Bay, Michigan, for the purpose of determining the wave growth within the bay as functions of fetch and time. The wave data acquired provide the basis for development and verification of a shallow-water wave hindcast model. The hindcast model, along with 20 years of wind data, is used to perform an extremal analysis of wave conditions within Saginaw Bay. Results of the analysis ... |
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| Mississippi Sound Wave-Hindcast Study: Main Text and Appendices A and B |
APR 1983 |
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| Authors:
Robert E. Jensen; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS HYDRAULICS LAB
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| Long-term overwater winds were generated using data from land-based meteorological stations adjacent to Mississippi Sound. A parametric shallow- water wave model was developed and verified employing extensive measured wave data. The shallow-water wave model and the simulated wind fields were utilized to calculate 20 years (1956-1975) of hindcast wave data for 23 sites in Mississippi Sound. Analyses of the hindcast wave data are presented. (Author) |
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| Mississippi Sound Wave-Hindcast Study: Appendices C and D |
APR 1983 |
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| Authors:
Robert E. Jensen; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS HYDRAULICS LAB
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| Contents: (Appendix C) Water Depth, Fetch Length, and Frequency Data; (Appendix D) Wave Data for Stations 1 through 12. |
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| Mississippi Sound Wave-Hindcast Study: Appendices E through G |
APR 1983 |
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| Authors:
Robert E. Jensen; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS HYDRAULICS LAB
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| Contents: (Appendix E) Wave Data for Stations 13 through 23; (Appendix F) Duration of Waves over a Specified Height Information; (Appendix G) Duration of Waves under a Specified Height Information. |
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| Atlantic Coast Hindcast, Shallow-Water, Significant Wave Information |
JAN 1983 |
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| Authors:
Robert E. Jensen; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS HYDRAULICS LAB
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| Using a numerical transformation technique, significant wave data (height, peak period, and direction) have been computed for the 20-year interval 1956 through 1975 for the U.S. Atlantic coast. The wave data are presented for 166 stations in six data products: (1) Geographical variation in the wave climate; (2) Twenty-year percent occurrence tables; (3) Wave rose diagrams; (4) Mean and largest wave-height tables; (5) Return period tables, including wave parameter statistics; ... |
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Reports by Author
