| Surface Wind Field Analyses of Tropical Cyclones in the Western Pacific |
Sep 2012 |
97 pages |
| Authors:
Louis J Cascino; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
 | Surface wind characteristics inside mature Tropical Cyclones (TC) over the Western North Pacific (WPAC) are analyzed using in-situ observations from the Impact of Typhoons on the Ocean in the Pacific (ITOP 2010) field program. Surface wind speeds obtained from the Stepped Frequency Microwave Radiometer (SFMR) and GPS dropwindsondes were used to calculate four surface wind variables: lowest 150 m average wind speeds (WL150), Vsfc, 10-m interpolated wind speed, and SFMR ... |
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| Fiedler Trees for Multiscale Surface Analysis |
Aug 2011 |
13 pages |
| Authors:
Matt Berger; Luis G Nonato; Valerio Pascucci; Claudio T Silva; AIR FORCE RESEARCH LAB ROME NY INFORMATION DIRECTORATE
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| In this work we introduce a new hierarchical surface decomposition method for multiscale analysis of surface meshes. In contrast to other multiresolution methods, our approach relies on spectral properties of the surface to build a binary hierarchical decomposition. Namely, we utilize the first nontrivial eigenfunction of the Laplace-Beltrami operator to recursively decompose the surface. For this reason we coin our surface decomposition the Fielder tree. Using the Fiedler tree ensures ... |
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| Reactive Nanocomposites for Controllable Adhesive Debonding |
Aug 2011 |
16 pages |
| Authors:
Michael Minnicino; James M Sands; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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| The ability to selectively attach and remove items from the surfaces of vehicles, aircraft, and other platforms without damaging the structures is a research interest of the military. An approach to achieving selective attachment, which includes adhesive bonding with on-demand debonding, has been demonstrated as a viable concept. However, the practical use of this approach is unrealized. The U.S. Army Research Laboratory (ARL) demonstrated that a bonded bimetallic stratified nanocomposite ... |
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| Conformal Surface Coatings to Enable High Volume Expansion Li-Ion Anode Materials |
12 Jul 2010 |
8 pages |
| Authors:
Leah A Riley; Andrew S Cavanagh; Steven M George; Yoon S Jung; Yanfa Yan; Se-Hee Lee; Anne C Dillon; NATIONAL RENEWABLE ENERGY LAB GOLDEN CO
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| An alumina surface coating is demonstrated to improve electrochemical performance of MoO3 nanoparticles as high capacity/ high-volume expansion anodes for Li-ion batteries. Thin, conformal surface coatings were grown using atomic layer deposition (ALD) that relies on self-limiting surface reactions. ALD coatings were tested on both individual nanoparticles and prefabricated electrodes containing conductive additive and binder. The coated and non-coated materials were characterized using transmission electron microscopy, energy-dispersive X-ray spectroscopy, electrochemical ... |
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| Surface Wind Field Analyses of Tropical Cyclones During TCS-08: Relative Impacts of Aircraft and Remotely-Sensed Observations |
Sep-2009 |
98 pages |
| Authors:
Patrick J Havel; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF METEOROLOGY
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| The objective of this research is to investigate tropical cyclone wind field structure and development utilizing comprehensive observation sets collected during the Tropical Cyclone Structure 2008 (TCS-08) and The Observing System Research and Predictability Experiment (THORPEX) Pacific Asian Regional Campaign (T-PARC). Rare aircraft measurements in the western North Pacific are utilized to define surface wind distributions of TY Nuri, TY Sinlaku, and STY Jangmi. Stepped Frequency Microwave Radiometer (SFMR) surface ... |
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| Surface Structure and Chemistry in the Epitaxial Growth of Cadmium Telluride on Silicon |
21 APR 2008 |
10 pages |
| Authors:
Michael Trenary; ILLINOIS UNIV AT CHICAGO CIRCLE DEPT OF CHEMISTRY
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| The goal of this project was to obtain an atomic-scale understanding of the surface processes that underlie the growth by molecular beam epitaxy (MBE) of HgCdTe on As-passivated Si surfaces. It is generally recognized that in MBE the first few monolayers determine the quality and structure of the final crystalline film. In principle, the methods of surface science can provide the critically needed information about the initial stages of film ... |
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| Synthesis of Metal Nanoclusters Doped in Porous Materials as Photocatalysts |
10-Apr-2008 |
18 pages |
| Authors:
Sofian M Kanan; AMERICAN UNIV OF SHARJAH (UNITED ARAB EMIRATES) DEPT OF CHEMISTRY
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| This report results from a contract tasking American University of Sharjah as follows: To achieve the goals of the project, three major tasks will be performed: 1.) The development of nanoclusters embedded in zeolites as potential photocatalysts. 2.) Identify conditions for optimum synthesis of nano-sized tungsten oxide (WO3) based materials. We will investigate synthetic sol-gel strategies for incorporating mixed metal into the WO3 framework. 3.) Surface analysis and catalytic studies. ... |
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| Advanced Cathodes for Next Generation Electric Propulsion Technology |
01-Mar-2008 |
174 pages |
| Authors:
Dustin J Warner; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| The research presented here investigated the feasibility of a 6.4 mm Lanthanum Hexaboride (LaB6) and Cerium Hexaboride (CeB6) hollow cathode for low power electric propulsion applications (100-300W). Two orifice geometries, one anode configuration, several anode and keeper currents, and a range of flow rates were tested for the LaB6 cathode. The CeB6 cathode underwent the same tests, with the exception of the second orifice geometry due to time constraints. The ... |
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| Multi-Sensor Improved Sea Surface Temperature (MISST) for GODAE |
Jan-2008 |
10 pages |
| Authors:
James Cummings; Eileen Maturi; Chelle L Gentemann; Gary A Wick; REMOTE SENSING SYSTEMS SANTA ROSA CA
|
| The Multi-sensor Improved Sea Surface Temperatures (MISST) for the Global Ocean Data Assimilation Experiment (GODAE) project intends to produce an improved, high-resolution, global, near-real-time (NRT), sea surface temperature analysis through the combination of satellite observations from complementary infrared (IR) and microwave (MW) sensors and to then demonstrate the impact of these improved sea surface temperatures (SSTs) on operational ocean models, numerical weather prediction (NWP), and tropical cyclone intensity forecasting. SST ... |
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| An Empirical Model-based MOE for Friction Reduction by Slot-Ejected Polymer Solutions in an Aqueous Environment |
21 DEC 2007 |
58 pages |
| Authors:
John G. Pierce; CORTANA CORP FALLS CHURCH VA
|
| Since the discovery of the Toms Effect in 1948, many investigators have explored the nature and causes of polymer-induced friction reduction, using both experimental and theoretical methods. External friction reduction for use on submarines and other marine vehicles is an area of great practical importance. In such applications, the polymer must be ejected at one or more locations along the vehicle's exterior surface, so the effects of non-uniform polymer concentration ... |
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| Surface Analysis of Reactive Ion Etched PZT Thin Films in SF6 Plasma |
SEP 2007 |
16 pages |
| Authors:
Eugene Zakar; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| Reactive ion etching of sol-gel deposited Pb(Zr(0.52) Ti(0.48)03 thin films was performed in SF6 plasmas. Etch rate was determined as a function of cathode power and chamber pressure, attaining a value of 65 nm/min at 300 W. Auger electron spectroscopy measurements revealed an excess Pb 10 nm thin layer on as-deposited film surfaces. X -ray photoelectron spectroscopy measurements showed the existence of ZrF4 and PbS04 species on etched surfaces, in ... |
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| Advanced, Non-Toxic, Anti-Corrosion, Anti-Fouling and Foul-Release Coatings Based on Covalently Attached Monolayers, Multilayers and Polymers |
08 AUG 2007 |
6 pages |
| Authors:
Thomas J. McCarthy; MASSACHUSETTS UNIV AMHERST DEPT OF POLYMER SCIENCE AND ENGINEERING
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| This report describes 7 publications that led from this grant: Buried Interface Modification Using Supercritical Carbon Dioxide, Controlled Growth of Silicon Dioxide from "Nanoholes" in Silicon-Supported Tris(trimethylsiloxy)silyl Monolayers, Adsorption of Poly(vinyl alcohol) onto Hydrophobic Substrates (2 papers), A General Approach for Hydrophilizing and Chemically Activating Surfaces, Chemical Surface Modification of Poly(p-xylylene) Thin-Films, Nylon Surface Modification (2 papers). |
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| The Effect of Orthophosphate as a Copper Corrosion Inhibitor in High Alkalinity Drinking Water Systems |
MAR 2007 |
97 pages |
| Authors:
Stephen Grace; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| The purpose of this research was to investigate orthophosphate as a corrosion inhibitor for copper pipe in a high-alkalinity drinking water system. Specifically, this thesis sought to answer three research questions regarding the impact of orthophosphate treatment, the nature of the mechanism by which orthophosphate controls copper corrosion, and the value of equilibrium modeling in predicting orthophosphate?s effects. The research questions were answered through a comprehensive literature review and experimental ... |
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| Laboratory Characterization of SAM-35 Concrete |
SEP 2006 |
97 pages |
| Authors:
Erin M. Williams; Stephen A. Akers; Paul A. Reed; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS GEOTECHNICAL AND STRUCTURES LAB
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| Personnel of the Geotechnical and Structures Laboratory, U.S. Army Engineer Research and Development Center, conducted a laboratory investigation to characterize the strength and constitutive property behavior of a SAM-35 concrete. Forty-four mechanical property tests consisting of two hydrostatic compression tests, four unconfined compression (UC) tests, 18 triaxial compression (TXC) tests, two uniaxial strain tests, four uniaxial strain load/biaxial unload (UX/BX) tests, three uniaxial strain load/constant volume tests, two uniaxial strain ... |
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| Laboratory Characterization of White Masonry Concrete |
SEP 2006 |
102 pages |
| Authors:
Erin M. Williams; Stephen A. Akers; Paul A. Reed; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS GEOTECHNICAL AND STRUCTURES LAB
|
| Personnel of the Geotechnical and Structures Laboratory, U.S. Army Engineer Research and Development Center, conducted a laboratory investigation to characterize the strength and constitutive property behavior of a white masonry concrete (WMC). Forty-four mechanical property tests consisting of two hydrostatic compression tests, four unconfined compression (UC) tests, 17 triaxial compression (TXC) tests, two uniaxial strain tests, four uniaxial strain load/biaxial unload (UX/BX) tests, five uniaxial strain load/constant volume tests, two ... |
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| Characterization and Optimization of a High Surface Area-Solid Phase Microextraction Sampler for the Collection of Trace Level Volatile Organic Compounds in the Field |
2006 |
68 pages |
| Authors:
Shannon S. McDonald; UNIFORMED SERVICES UNIV OF THE HEALTH SCIENCES BETHESDA MD F EDWARD HEBERT SCHOOL OF MEDICINE
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| A prototype rapid, high volume air sampling device based on Solid Phase Microextraction (SPME) has been developed for the collection of trace level volatile organic compounds (VOCs). The High Surface Area-Solid Phase Microextraction (HSASPME) device contains ten times more polymer than traditional SPME fibers and is uniquely designed to optimize compound uptake at higher flow rates. This study evaluated the extraction efficiency at six air sampling flow rates ranging from ... |
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| Three-Dimensional Nano-Lithography for Emerging Technologies |
27 SEP 2005 |
11 pages |
| Authors:
Dennis W. Prather; DELAWARE UNIV NEWARK
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| Grayscale lithography has shown particular success in the pursuit of surface machining capabilities because of the flexibility and convenience it offers in the fabrication of arbitrary three-dimensional surfaces. Accordingly, grayscale lithography has been demonstrated for a wide range of applications, including refractive and diffractive optical elements for focusing and beam shaping, optical interconnects, and MEMS. While our original motivation for this research area was the fabrication of three different micro-optical ... |
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| Carbon Deposition on Blade Surfaces of Laser Microactuator for Optical MEMS |
13 JUL 2005 |
7 pages |
| Authors:
Ying He; M. Ota; S. K. Stefanov; TOKYO METROPOLITAN UNIV (JAPAN)
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| A laser opto-microactuator has been proposed as an Optical Micro-Electro-Mechanical-Systems (OMEMS). The rotational or twisting mechanisms of the microactuator have been discussed. For increasing the sensitivity of the actuator, the temperature difference between the front and rear blade surfaces of the actuator should be increased. Therefore, high absorption rates on the blade surface with laser beam irradiation and low heat conductivities of blade materials are needed. In the present paper ... |
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| Nucleobase Orientation and Ordering in Films of Single-Stranded DNA on Gold |
APR 2005 |
3 pages |
| Authors:
Dmitri Y. Petrovykh; V. Perez-Dieste; Aric Opdahl; Hiromi Kimura-Suda; J. M. Sullivan; Michael J. Tarlov; F. J. Himpsel; Lloyd J. Whitman; MARYLAND UNIV COLLEGE PARK DEPT OF PHYSICS
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| Understanding the structure of single-stranded DNA (ssDNA) immobilized on surfaces is critical for applications exploiting the molecular recognition function of nucleic acids. Here we show how the structure of ssDNA monolayers can be characterized using complementary spectroscopies that probe electronic and vibrational states of nucleobasessX-ray photoelectron (XPS), Fourier transform infrared (FTIR), and near-edge X-ray absorption fine structure (NEXAFS) spectroscopies. XPS reveals core-level shifts sensitive to DNA surface chemistry; NEXAFS probes ... |
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| Agent Fate -- Measurement Of Chemical Warfare Agent Persistence On Contaminated Surfaces Under Controlled Environmental Conditions |
16 NOV 2004 |
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| Authors:
Wesley Ercanbrack; Beryl Schwartz; Travis Losser; Tom Lindsey; SCIENCE AND TECHNOLOGY CORP HAMPTON VA
|
 | An innovative 16 cell test fixture was constructed at the Kendall Combined Chemical Test Facility (CCTF) located at Dugway Proving Ground's West Desert Test Center to measure the vapor hazard of chemical warfare agents on contaminated surfaces under controlled environmental conditions. Vegetation, aged CARC coated steel, MHE coated steel and soil were tested at 35 deg C with 50% relative humidity (RH) and a wind speed of 1.65 miles per ... |
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| Properties and Improved Space Survivability of POSS Polyimides |
NOV 2004 |
56 pages |
| Authors:
Sandra Tomczak; AIR FORCE RESEARCH LAB EDWARDS AFB CA SPACE AND MISSILE PROPULSION DIV
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| Briefing charts only on the properties and improved space survivability of POSS Polyimides. |
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| Etching Characteristics and Surface Analysis of Molecular Bean Epitaxy Grown P-Type Aluminum Gallium Nitride With Boron Trichloride/Chlorine Gases in Inductively Coupled Plasma (ICP) Dry Etching |
NOV 2004 |
21 pages |
| Authors:
Fred Semendy; Phillip Boyd; Unchul Lee; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
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| Dry etching of magnesium doped p-type aluminum gallium nitride grown by molecular beam epitaxy (MBE) has been carried for the first time by inductively coupled plasma (ICP) system via the boron trichloride/chlorine (BCl3/Cl2) gas system with variations in chuck power, ICP power, chlorine (Cl2) ratio in Cl2/BCl3 and process pressure. Processed samples were cleaned by standard techniques, depths were measured, and etching rates and selectivity were calculated. Surface morphology of ... |
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| Properties and Improved Space Survivability of POSS (Polyhedral Oligomeric Silsesquioxane) Polyimides |
NOV 2004 |
14 pages |
| Authors:
Sandra J. Tomczak; Darrell Marchant; Steve Svejda; Timothy K. Minton; Amy L. Brunsvold; Eitan Grossman; George C. Schatz; Diego Troya; LiPeng Sun; Irina Gouzman; AIR FORCE RESEARCH LAB EDWARDS AFB CA SPACE AND MISSILE PROPULSION DIV
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| Kapton polyimide (PI) is widely used on the exterior of spacecraft as a thermal insulator. Atomic oxygen (AO) in lower earth orbit (LEO) causes severe degradation in Kapton resulting in reduced spacecraft lifetimes. One solution is to coat the polymer surface with SiO2 since this coating is known to impart remarkable oxidation resistance. Imperfections in the SiO2 application process and micrometeoroid/debris impact in orbit damage the SiO2 coating, leading to ... |
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| Quantifying Source Excitation and Path Effects for High Frequency Regional Waves |
01 OCT 2004 |
59 pages |
| Authors:
Ru-Shan Wu; Xiao-Bi Xie; Thorne Lay; CALIFORNIA UNIV SANTA CRUZ
|
| This research is directed at investigation of regional wave excitation and propagation in complicated crustal waveguides using numerical simulations. The report covers three major approaches: (1) A finite-difference plus slowness analysis method for investigating near-source Lg-wave excitation and partitioning; (2) The half-space screen method for simulating high frequency Lg-wave propagation; and (3) A boundaty element method for calculating Lg-wave propagation in the crustal waveguide with uneven surface topography. |
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| Non-Destructive Testing of Corrosion Under Coatings |
01 SEP 2004 |
248 pages |
| Authors:
John D. Weir; Don DiMarzio; Hugh S. Isaacs; NORTHROP GRUMMAN CORP BETHPAGE NY INTEGRATED SYSTEMS
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| Surface corrosion on aluminum aircraft skins near joints and around fasteners is often an indicator of buried structural corrosion and cracking. Aircraft paints are routinely removed to reveal the presence of corrosion on the surface of metal structures and the aircraft is subsequently repainted. This process can be very expensive time consuming and results in the generation of air pollution and process waste. A method is needed to detect the ... |
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| Quantifying the Effect of a Freeze-Thaw Cycle on Soil Erosion, Laboratory Experiments |
JUL 2004 |
47 pages |
| Authors:
M. G. Ferrick; L. W. Gatto; ENGINEER RESEARCH AND DEVELOPMENT CENTER HANOVER NH COLD REGIONS RESEARCH AND ENGINEERING LAB
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| In this paper we quantitatively tested the hypothesis that soil freeze-thaw(FT) processes significantly increase the potential for upland hillslope erosion during runoff events that follow thaw. We selected a frost- susceptible silt to obtain an upper bound on FT effects, and completed three series of six experiments each to quantify differences in soil erodibility and rill development for bare soil following a single FT cycle. Each series represented a specific ... |
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| Multi-Sensor Improved Sea Surface Temperature (MISST) for GODAE |
01-Jan-2004 |
7 pages |
| Authors:
Chelle L Gentemann; Gary A Wick; James Cummings; Eric Bayler; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
|
| The Multi-sensor Improved Sea Surface Temperatures (MISST) for the Global Ocean Data Assimilation Experiment (GODAE) project intends to produce an improved, high-resolution, global, near-real-time (NRT), sea surface temperature analysis through the combination of satellite observations from complementary infrared (IR) and microwave (MW) sensors and to then demonstrate the impact of these improved sea surface temperatures (SSTs) on operational ocean models, numerical weather prediction, and tropical cyclone intensity forecasting. SST is ... |
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| Scaling Relationships for Biomolecules Adhesion and Activity on Polymeric Surfaces |
JAN 2004 |
50 pages |
| Authors:
Dan Nicolau; Sverre Myhra; INDUSTRIAL RESEARCH INST SWINBURNE (IRIS) HAWTHORN (AUSTRALIA)
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| The project focused on the understanding and engineering quantification of the attachment of biomolecules and cells on polymeric surfaces. The project delivered design tools and guidelines that can be used in the process of design, fabrication and operation of microfluidics devices, in particular plastic-based devices. The project comprised modeling/simulation and experimental modules. The classification results are contained in an online freely accessible database, http://www.bionanoeng.com/bad. This biomolecular adsorption database has over ... |
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| Integrated Instrumentation System for the Surface Characterization of Organic Electronic Materials and Devices |
2004 |
9 pages |
| Authors:
Yang Yang; CALIFORNIA UNIV LOS ANGELES
|
| The AFOSR DURIP grant has helped us to setup a dual-chamber multi- technique (UPS and XPS) surface analysis system, purchased from Omicron Nano Technology. This is the most important equipment we have obtained in recent years. This instrument allows us to measure Ultra-violet Photoelectron Spectroscopy (UPS) and X-ray Photoelectron Spectroscopy (XPS), which are indeed the first such system at UCLA campus. The instrumentation was installed in May, 2004, and fully ... |
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| Impact Of Seawinds Scatterometer Data On Ocean Surface Analysis And Weather Prediction |
Sep-2003 |
5 pages |
| Authors:
R Atlas; S C Bloom; J Ardizzone; E Brin; J Terry; T-W Yu; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION GREENBELT MD GODDARD SPACE FLIGHT CENTER
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| Scatterometer observations of the ocean surface wind speed and direction improve the depiction and prediction of storms at sea. These data are especially valuable where observations are otherwise sparse?mostly in the Southern Hemisphere and tropics, but also on occasion in the North Atlantic and North Pacific. The SeaWinds scatterometer on the QuikScat satellite was launched in June 1999 and it represents a dramatic departure in design from the other scatterometer ... |
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| Ferroelectric-Domain and Surface Nano-Engineering of a Near- Stoichiometric LiNbO3 Single Crystal |
17 JUN 2003 |
8 pages |
| Authors:
K. Terabe; M. Nakamura; S. Takekawa; K. Kitamura; S. Higuchi; NATIONAL INST FOR MATERIALS SCIENCE IBARAKI TSUKUBA (JAPAN)
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| The ferroelectric domain and surface of single crystal LiNbO3 at the microscale to nanoscale level were engineered and observed by scanning force microscopy (SFM). We used a near-stoichiometric LiNbO3 crystal, that had a coercive field of about one-ninth that of a conventional congruent LiNbO3 crystal, as the sample. The z-cut LiNbO3 crystals fixed on metal substrates were polished to a thickness of approximately 5 micrometers. Domain structures were patterned in ... |
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| Shape and Surface Reconstruction, Quantification and Deformation |
08 JAN 2003 |
5 pages |
| Authors:
Herbert Edelsbrunner; Ping Fu; DUKE UNIV DURHAM NC DEPT OF COMPUTER SCIENCE
|
| Research under this grant focused on the reconstruction and the representation of continuous shapes and objects. The primary data structure are meshes, and we study triangle meshes for surface and tetrahedron meshes for volume data. Beyond these two types, we obtained new results for constructing quadrangular meshes for surfaces. Our approach to these problems was fairly broad, ranging from problem modeling, to algorithm design, to implementing and experimenting, and to ... |
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| Primer: Using Watershed Modeling System (WMS) for Gridded Surface Subsurface Hydrologic Analysis (GSSHA) Data Development - WMS 6.1 and GSSHA 1. 43C |
JAN 2003 |
87 pages |
| Authors:
Charles W. Downer; E. J. Nelson; Aaron Byrd; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICSLAB
|
| This document is a primer for use of the Watershed Modeling System (WMS) interface with the physically based, distributed-parameter hydrologic model Gridded Surface Subsurface Hydrologic Analysis (GSSHA). The primary purpose of this primer is to describe how the WMS interface is used to develop inputs and analyze output from the GSSHA model. This primer also provides a brief description of the GSSHA model including the overall model formulation, processes that ... |
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| Validation Study of Operational Battlescale Forecast Model (BFM) Over Western Asian Regions |
DEC 2002 |
32 pages |
| Authors:
Teizi Henmi; John W. Raby; John Crunclet; Jim Kratzer; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The Current version of the Battle scale Forecast Model (BFM) on the U.S. Army Integrated Meteorological System was evaluated by comparing the model's forecast data with observed meteorological data. Two model domains adjacent to Afghanistan, Iran, and Pakistan were selected to run the BFM for 24- hr forecast periods in operational mode. Due to the limited number of observation stations and data, the results obtained in this study should be ... |
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| Development of High Frequency Numerical Simulation Tools for Electromagnetic Scattering and Radiation Problems in Frequency and Time Domain |
04 NOV 2002 |
85 pages |
| Authors:
Elizabeth H. Bleszynski; Marek K. Bleszynski; Thomas Jaroszewicz; MONOPOLE RESEARCH THOUSAND OAKS CA
|
| Report developed under STTR contract for topic AF01-T009. The main objective of the Phase I effort was to setup a framework for the wavefront (WF) evolution technique and to investigate the feasibility of incorporating, in a fashion consistent with reciprocity, of the edge diffraction effects into the WF approach. A wavefront is defined as a surface on which the propagating fields have a constant phase. Main advantages of the WF ... |
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| Instrumentation to Facilitate High Protection Materials Synthesis and Analysis with an Existing Ti-Sapphire Femtosecond Laser |
31 OCT 2002 |
7 pages |
| Authors:
Clive R. Clayton; STATE UNIV OF NEW YORK AT STONY BROOK DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| We have designed and built a high precision computer controlled materials synthesis and analysis vacuum apparatus which will enable state-of- the-art control for both micro-machining and inspection as well as thin film synthesis when interfaced to our University's Ti-sapphire femtosecond laser. The majority of the machining of this apparatus had to be performed at a company who has had difficulties with meeting schedules due to probable downsizing issues. This has ... |
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| Workshop on Benchmark Experiments in Contact Mechanics as Applied to Gas Turbine Engines Held in West Palm Beach on 12-13 May 2002 |
02 SEP 2002 |
11 pages |
| Authors:
Jerry H. Griffin; D. Ewins; CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF MECHANICAL ENGINEERING
|
| An international workshop on benchmarks in contact mechanics and friction damping was held on the 12th and 13th of May in conjunction with the DoD sponsored HCP Conference in West Palm Beach, FL. The workshop was organized by Dr. J.H. Griffin, a Professor at Carnegie Mellon University in Pittsburgh, and Dr. E. Ewins, a Professor at Imperial College in London. The workshop was a follow-on to a workshop held last ... |
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| Corrosion Protection of Aluminum Alloys Used in Aircraft - Testing, Analysis and Development of Environmentally Compliant Coatings and Pretreatments for the Corrosion Protection of Aircraft Alloys |
SEP 2002 |
19 pages |
| Authors:
Gordon P. Bierwagen; Dennis E. Tallman; Stuart Croll; Philip Boudjouk; Victoria J. Gelling; NORTH DAKOTA STATE UNIV FARGO
|
| This report describes the work for FY 2000 for the Project Corrosion Protection of Aluminum Alloys Used in Aircraft (Grant # F49620-99-1.0283) for AFOSR. This Report contains the following sections that address the technical goals of the project: Goal 1. Improved electrochemical test methods and protocols for characterizing the performance of coated aircraft alloys. Goal 2. Surface Analysis Studies of Degradation of Coatings Properties Goal 3. SVET studies of Coated ... |
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| Reactions of Energetic Ions with Thin Film Surfaces |
28 JUN 2002 |
10 pages |
| Authors:
Dennis C. Jacobs; NOTRE DAME UNIV IN DEPT OF CHEMISTRY AND BIOCHEMISTRY
|
| The PI has designed and constructed a multi function vacuum chamber for evaporating metal films and depositing insulating layers. The chamber is to be used for fabricating metal-insulator-metal (M-I-M) devices that function as novel solid-state electron emitters. Nanoscale M-I-M devices deliver hot electrons to the metal/vacuum interface from within the solid. These hot electrons can stimulate nonthermal chemical reactions at the gas/surface interface or supplement the charge density of a ... |
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| Nanometer Scale Antibody Patterning for Directed Cell Immobilization and Stimulation |
22 APR 2002 |
11 pages |
| Authors:
Reid N. Orth; CORNELL UNIV ITHACA NY
|
| Antibodies (AB) are patterned at nanoscale precision for the precise immobilization and stimulation of immune cells. We demonstrate that the antigen bovine serum albumin (BSA) can be patterned on silicon using a photolithographically patterned polymer lift-off technique. The nanoscale pattern is realized as the polymer is mechanically peeled away in one courageous piece in aqueous solution. Anti-BSA AB are bound specifically to BSA to create a pattern of oriented Ab ... |
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| A Multi-Layer Finite Element Model of the Surface EMG Signal |
25 OCT 2001 |
|
| Authors:
M. Lowery; N. Stoykov; A. Taflove; T. Kuiken; REHABILITATION INST OF CHICAGO IL
|
| The influence of skin, adipose tissue and bone on the rate of decay of the surface EMG signal around the limb was explored using a new finite element model. Replacing the outer layer of a homogeneous muscle model with a layer of highly resistive tissue, such as skin or fat, results in an increase in the surface potential. This also causes an increase in the rate of decay of EMG ... |
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| Detecting Skin Burns Induced by Surface Electrodes |
25 OCT 2001 |
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| Authors:
A. Patriciu; K. Yoshida; T. P. DeMonte; M. L. Joy; AALBORG UNIV (DENMARK) CENTER FOR SENSORY-MOTOR INTERACTION
|
| The origin of electrical burns under gel-type surface electrodes is a controversial topic that is not well understood. To investigate the phenomenon, we have developed an excised porcine skin+gel model. In the present paper, we describe methods to detect these burns in the skin+gel model in an effort to understand the genesis of these burns. Burns were induced by severe electrical stimulation and changes in the impedance spectra and current ... |
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| Water Quality Additions to CASC2D - Taps |
SEP 2001 |
8 pages |
| Authors:
Patrick N. Dellman; Terry K. Gerald; Carlos E. Ruiz; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS
|
| The purpose of this effort was the implementation of nutrient water quality components included in the Transport and Pollutant System (TAPS) into the CASC2D hydrology watershed model. The CASC2D model is still in development and is being improved, refined, and updated with new technology. Users of CASC2D need to have a thorough background in hydrology and numerical modeling. CASC2D is currently being restructured and an updated version (under a new ... |
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| High-Rate Sputter-Deposited Tantalum Coatings on a Steel Liner for Wear and Erosion Mitigation |
AUG 2001 |
29 pages |
| Authors:
S. L. Lee; J. Cox; D. Windover; M. Audino; D. W. Matson; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
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| A prototype, rifled steel liner of 20-min inside diameter was coated with -50 to 125 micronmeter tantalum at -22.6 micronmeter/hour in krypton gas using a triode-sputter system. It was test fired with l5OO rounds for the mitigation of high-temperature and pressure wear and erosion. Growth surface analysis showed predominately alpha-phase and minimal beta-phase surface tantalum. Area detector images showed near random, slight preferred (211) crystalline orientation. X-ray diffraction revealed a ... |
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| Are Observed White Areas on Mars Real |
15 JUN 2001 |
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| Authors:
Jeff Beish; ASSOCIATION OF LUNAR AND PLANETARY OBSERVERS (ALPO) MEMPHIS TN
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| Astronomers describe so-called white areas observed on Mars as bright patches of light most often seen in the desert regions of the Red Planet. They are generally bright in all colors and cospicuous in integrated light (no filters); however, we must analyze this phenomenon before jumping to conclusions. The nature of white areas, as described by the past A.L.P.O. Mars Section Recorder, Chick Capen, should be discussed at length. ... |
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| Research and Development Support for Surface Preparation, Modification and Characterization for Navy Applications |
FEB 2001 |
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| Authors:
W. Green; W. Bailey; R. Bolster; M. Curry; M. Natesan; GEO-CENTERS INC NEWTON CENTRE MA
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| GEO-CENTERS, INC. programs in support of the Surface Chemistry Branch within the Chemistry Division of the Naval Research Laboratory have addressed research and development support for surface preparation, modification and characterization of materials and processes for Navy applications. The work accomplished encompassed a broad range of research in biotechnology, chemistry, materials science, and corrosion engineering. The work also involved application engineering for shipboard solid waste disposal systems and development of ... |
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| Dynamic Skin Triangulation |
2001 |
45 pages |
| Authors:
H. Edelsbrunner; Ho-Lun Cheng; T. K. Dey; J. Sullivan; ILLINOIS UNIV AT URBANA DEPT OF COMPUTER SCIENCE
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| This paper describes an algorithm for maintaining an approximating triangulation of a deforming surface in R3. The surface is the envelope of an infinite family of spheres defined and controlled by a finite collection of weighted points. The triangulation adapts dynamically to changing shape, curvature, and topology of the surface. |
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| Are Cloud Bands on Mars Rare or Not |
2001 |
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| Authors:
Jeff Beish; ASSOCIATION OF LUNAR AND PLANETARY OBSERVERS (ALPO) MEMPHIS TN
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| The atmosphere of Mars is ever changing. White water ice clouds, yellowish dust clouds, bluish limb hazes, and bright surface frosts have been studied with increasing interest in the past decades. We are beginning to think these clouds are related to the seasonal sublimation and condensation of polar caps. Statistical analysis indicates that water ice-crystal cloud activity and near-surface "fog" occurrence is significantly higher in the Martian Northern spring and ... |
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| Surface-Chemistry-Driven Tribological Fundamentals of Diamond and SiC for Extreme Environment MEMS Applications |
31 DEC 2000 |
56 pages |
| Authors:
Michael N. Gardos; RAYTHEON CO EL SEGUNDO CA
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| Environmental SEM tribometry of the pressureless-sintered Hexoloy alpha-SiC ceramics was continued in 0.2 and 3.4 Torr partial pressures of oxygen (Po2) at room temperature (RT) to 95O deg C, coupled with after-test SEM photomicrography and AES/XPS surface analyses of the wear scars and the adjacent (unused) surfaces. The results show some correlation in the somewhat improved friction behavior of both the previously tested CERCOM SiC-B in partial pressures of oxygen ... |
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| Surface Tribochemistry: PFPAE Lubricants |
16 DEC 2000 |
11 pages |
| Authors:
Andrew J. Gellman; CARNEGIE-MELLON UNIV PITTSBURGH PA
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| The principle objective of this research project was to develop and apply methods for study of the surface chemistry of long chain oligomeric species such as perfluoropolyalkylether (PFPE) lubricants. The PFPEs are liquid lubricants used for a number of very high temperature applications. They typically have molecular weights in the range 1,000 - 10,000 amu and have very low vapor pressures. These molecular weights correspond ... |
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SURFACE ANALYSIS
