| Water Adsorption With Hysteresis Effect onto Microporous Activated Carbon Fabrics |
Jan-2007 |
18 pages |
| Authors:
Patrick D Sullivan; Mark J Rood; Zaher Hashisho; Brenton R Stone; AIR FORCE RESEARCH LAB TYNDALL AFB FL
|
 | Understanding the adsorption of water vapor onto activated carbons is important for designing processes to remove dilute contaminants from humid gas streams, such as providing protection against chemical warfare agents (CWAs), or against toxic industrial compounds (TICs) used in a terrorist chemical attack. Water vapor isotherms for Calgon BPL granular activated carbon (GAC), military ASZM-TEDA GAC, electrospun activated carbon nanofibers (ACnF), Calgon Zorflex? activated carbon cloth, and Novoloid-based activated carbon ... |
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| The Relationship Between Chemical Structure and Dielectric Properties of Plasma-Enhanced Chemical Vapor Deposited Polymer Thin Films (Postprint) |
2007 |
12 pages |
| Authors:
Kurt Eyink; Jesse Enlow; Timothy J. Bunning; Hao Jiang; Lianggou Hong; N. Venkatasubramanian; John T. Grant; Kevin Wiacek; Sandra Fries-Carr; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
|
| Polymer dielectric films fabricated by plasma enhanced chemical vapor deposition (PECVD) have unique properties due to their dense crosslinked bulk structure. These spatially uniform films exhibit good adhesion to a variety of substrates, excellent chemical inertness, high thermal resistance, and are formed from an inexpensive, solvent-free, room temperature process. In this work, we studied the dielectric properties of plasma polymerized (PP) carbon-based polymer thin films prepared from two precursors, benzene ... |
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| Quantum Information Processing Using Local Control of Exchange in 1D Nanotubes |
31 DEC 2006 |
20 pages |
| Authors:
Charles M. Marcus; Boris L. Altshuler; Charles M. Lieber; Hongkun Park; HARVARD UNIV CAMBRIDGE MA DEPT OF PHYSICS
|
| The overall project aimed to develop gated nanotubes and nanowires to be used in the development of spin qubits arranged in a 1D array. Nanotube circuits with gate-confined single and double dots were realized, shell-core nanowire growth methods were developed, gated nanowire circuits were fabricated, and double quantum dots, appropriate for singlet-triplet qubits, were investigated experimentally. We also investigated light emission from nanowires, to be of potential use in electron-photon ... |
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| Thermodynamic and Mechanical Properties of Epon 862 With Curing Agent Detda by Molecular Simulation |
DEC 2006 |
40 pages |
| Authors:
Jeremy L. Tack; TEXAS A AND M UNIV COLLEGE STATION DEPT OF CHEMICAL ENGINEERING
|
| Fully atomistic molecular dynamics (MD) simulations were used to predict the properties of EPON 862 cross-linked with curing agent DETDA, a potentially useful epoxy resin for future applications of nanocomposites. The properties of interest were density (at near-ambient pressure and temperature), glass transition temperature, bulk modulus, and shear modulus. The EPON molecular topology, degree of curing, and MD force-field were investigated as variables. The range of molecular weights explored was ... |
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| Oxygen Plasma Treatment and Deposition of CNx on a Fluorinated Polymer Matrix Composite for Improved Erosion Resistance (Preprint) |
DEC 2006 |
28 pages |
| Authors:
C. Muratore; A. Korenyi-Both; J. E. Bultman; A. R. Waite; J. G. Jones; A. A. Voevodin; T. M. Storage; UNITED TECHNOLOGIES CORP (UTC) WRIGHT-PATTERSON AFB OH
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| High-performance polymer matrix composites (PMCs) are an appealing choice for materials in aerospace applications due to their high strength-to-weight ratio and stability over a broad temperature range for thousands of service hours. The use of PMCs in propulsion applications is currently limited only by insufficient resistance to erosion by abrasive media. Erosion-resistant coatings may provide the necessary protection, however their application is not straightforward, as surface preparation is a challenge. ... |
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| Purification of Contaminated MIL-PRF-83282 Hydraulic Fluid Using the Pall Purifier and Multiple Process Configurations (Preprint) |
NOV 2006 |
18 pages |
| Authors:
Jr. Snyder Carl E.; Lois J. Gschwender; Stephen L. Gunderson; George W. Fultz; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
|
| The amount of hydraulic fluid used by all branches of the military is significant both in terms of volume and cost. The disposal of used hydraulic fluid is a cost, time, and logistical component that can be greatly reduced by the purification and reuse of used hydraulic fluid. This report describes a project that evaluated the effectiveness of various hydraulic fluid purification process configurations on the removal of water and ... |
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| Microfabricated Traveling Wave Tubes for High Power Millimeter-Wave and THz-regime Sources |
31 OCT 2006 |
15 pages |
| Authors:
John H. Booske; Dan van der Weide; Hongrui Jiang; Steve Limbach; Sean Sengele; Al Marshal; Ben Yang; Amy Marconnet; Mike He; Sam Drezdzon; WISCONSIN UNIV-MADISON DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| The millimeter-wave (MMW) and terahertz (THz)-regime portions of the electromagnetic spectrum have enormous application potential, including high-data-rate communications, remote sensing and threat detection, high resolution radar, biomedical imaging, and spectroscopic analysis. To exploit this potential, new sources of coherent electromagnetic radiation are needed in the frequency range of 100 - 1000 GHz. The ideal sources would provide high power with high efficiency in a compact, lightweight, and low-cost package. Many ... |
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| Probing the Role of Promoters in Zinc Reduction of Nitrobenzene: Continuous Production of Hydroxylaminobenzene [PREPRINT] |
30 OCT 2006 |
24 pages |
| Authors:
Lixiong Li; Theodore V. Marolla; Lloyd Nadeau; Jim C. Spain; AIR FORCE RESEARCH LAB TYNDALL AFB FL MATERIALS AND MANUFACTURING DIRECTORATE
|
| Production of hydroxylaminobenzene (HAB) via zinc reduction of nitrobenzene (NB) is an established batch process based on aqueous electrolytic reactions involving an electrolyte as the promoter. This experimental study explored continuous production of HAB that is needed as an intermediate in a novel zinc/biocatalyst processing train to obtain aminophenols. Experiments were conducted suing a Zn packed bed to probe the role of promoters under continuous-flow conditions at a temperature of ... |
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| Synthesis of Hybrid Conducting Nanowire Using AAO Template |
28 SEP 2006 |
9 pages |
| Authors:
Wansoo Huh; SOONGSIL UNIV SEOUL (KOREA) DEPT OF CHEMICAL AND ENVIRONMENTAL ENGINEERING
|
| The most promising way to prepare uniform dimension of nanomaterials is to use anodized alumina membrane as template. The work emphasized self-organized arrangement of pores in hexagonal array and vertical direction expansion for the high aspect ratio, and the self-liming surface reaction. From these approaches, the atomic layer deposition was controlled precisely at the molecular level. |
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| Relationship Between Packing Structure and Porosity in Fixed Beds of Equilateral Cylindrical Particles |
23-Sep-2006 |
16 pages |
| Authors:
Wenli Zhang; Karsten E Thompson; Allen H Reed; Liese Beenken; LOUISIANA STATE UNIV BATON ROUGE DEPT OF CHEMICAL ENGINEERING
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| Fixed beds of cylindrical particles are important in chemical engineering applications, but their packing structures are not as well understood or as well characterized as sphere packings. In this work, X-ray microtomography is used to obtain 3D images of 1.8 mm diameter equilateral cylinders in a 23 mm cylindrical container over a range of bulk porosities. A novel algorithm is used to computationally reconstruct the packings, resulting in data sets ... |
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| Chemical Vapor Composite Silicon Carbide for Space Telescopes (postprint) |
18 SEP 2006 |
23 pages |
| Authors:
Clifford T. Tanaka; Kyle Webb; TREX ENTERPRISES CORP LIHUE HI
|
| The purpose of this figure study was to demonstrate the optical figure and opto-mechanical performance capabilities for Trex's CVC SiC material. In the course of this activity a plano mirror was designed, fabricated, polished, and analyzed using interferometry tools and methods. The opto-mechanical and interferometric performance results are presented and analyzed in this report. |
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| Dynamics of Epitaxy on the Nano-sized Semiconductor Surfaces |
05 SEP 2006 |
17 pages |
| Authors:
Deng-Sung Lin; NATIONAL CHIAO-TUNG UNIV HSINCHU (TAIWAN) INST OF PHYSICS
|
| Semiconductor self assembled quantum dots (QDs) have emerged as one of the simplest subjects for exploring and exploiting the physics and device applications of charge carriers and excitons in the three dimensional confinement regime. Nanoscale-sized surface in the form of mesa or ridges on patterned substrates offer opportunities not only for creating large densities of QDs with great homogeneity but also for novel growth-control engineering. This project aims at a ... |
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| Molecular Simulation of the Vapor-Liquid Phase Behavior of Lennard-Jones Mixtures in Porous Solids |
SEP 2006 |
12 pages |
| Authors:
John K. Brennan; Wei Dong; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| We present vapor-liquid phase coexistence curves for binary fluid mixtures in a disordered porous solid. The porous material is modeled as a collection of randomly dispersed hard spheres. A variant of the Monte Carlo Gibbs ensemble method [J. K. Brennan and W. Dong, J. Chem. Phys. 116, 8948 (2002)] is used to simulate Lennard-Jones fluid mixtures at several porosities: 0.9, 0.95, and 0.975. Effects based on the size and the ... |
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| Synthesis of Multifunctional Materials |
SEP 2006 |
23 pages |
| Authors:
Hadis Morkoc; VIRGINIA COMMONWEALTH UNIV RICHMOND
|
| Single-crystal PbTiO3 layers were grown on (001) SrTiO3 substrates by molecular beam epitaxy using hydrogen peroxide as an oxidant. Phase composition and structural properties of the films were examined as a function of growth parameters. It was found that single-phase PbTiO3 films grew epitaxially at substrate temperatures of 600 degrees C and higher, whereas layers grown at lower temperature contained PbO inclusions. Growth of Pb(ZrTi)O3 (PZT) films by molecular beam ... |
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| The Structure and Dielectric Properties of Plasma-Polymerized Benzene and OFCB Thin Films (Preprint) |
SEP 2006 |
5 pages |
| Authors:
Hao Jiang; Lianggou Hong; N. Venkatasubramanian; John T. Grant; Kurt Eyink; Kevin Wiacek; Sandra Fries-Carr; Jesse Enlow; Timothy J. Bunning; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH SURVIVABILITY AND SENSOR MATERIALS DIV/HARDENED MATERIALS
|
| Polymeric dielectric and photonic thin films can be fabricated using plasma enhanced chemical vapor deposition (PECVD), a room temperature, solvent-free and versatile technique. Many organic precursors have been deposited yielding plasma polymerized thin films with a wide range of functionalities. These films, exhibiting highly cross-linked structures, pin-hole free bulk morphologies and smooth surfaces for a variety of film thicknesses, have been targeted for optical and dielectric applications such as waveguides, ... |
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| The Relationship of Microscopic Material Characteristics & Physical Behavior of Quantum Dots |
25 AUG 2006 |
4 pages |
| Authors:
Shan Torng; Y-C Fang; L. Hsu; CHUNG-SHAN INST OF SCIENCE AND TECHNOLOGY TAO-YUAN (TAIWAN) MATERIAL AND ELECTRO-OPTICS DIV
|
| This research collected and analyzed the composition, structure and microstructure information at microscopic scales for the self-organized InAs/GaAs quantum dots through development of proper characterization techniques. |
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| Identification and Initial Screening of New Compounds to Control Harmful Algal Blooms |
AUG 2006 |
9 pages |
| Authors:
Angela G. Poovey; Michael D. Netherland; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
|
| This technical note identifies, prioritizes, and evaluates "reduced risk" chemical compounds that have the potential to selectively control harmful algal blooms (HAB). Results of these evaluations are shared with key regulatory agencies to expedite development of new algaecide registrations for use in lakes and reservoirs. |
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| Molybdenum Disulfide as a Lubricant And Catalyst in Adaptive Nanocomposite Coatings (Preprint) |
AUG 2006 |
19 pages |
| Authors:
C. Muratore; A. A. Voevodin; UNIVERSAL TECHNOLOGY CORP DAYTON OH
|
| Nanocomposite YSZ-Ag-Mo-MoS2 with different MoS2 additions (0-100 atomic percent) coatings were deposited with a hybrid pulsed laser/magnetron sputtering/filtered cathodic arc process. Wear testing was performed from 25-700 degrees C for each of the coatings. Electron microscopy and other characterization techniques were used to examine the surfaces and wear tracks of the coatings to determine the mechanisms resulting in the measured tribological properties. Adaptive coatings containing 8 atomic percent MoS2 demonstrated ... |
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| Growth of In-rich InGaN Quantum Dots (QDs) by Metalorganic Chemical Vapor Deposition (MOCVD) |
28 JUL 2006 |
9 pages |
| Authors:
Euijoon Yoon; SEOUL NATIONAL UNIV (REPUBLIC OF KOREA) SCHOOL OF MATERIALS SCIENCE AND ENGINEERING
|
| In-rich InGaN/GaN quantum dots (QDs) were successfully grown by metal-organic chemical vapor deposition. Growth at low temperatures below 700 C made it possible to obtain In-rich InGaN layer with In content over 70 % and was confirmed by electron probe microanalysis (EPMA) and x-ray diffraction (XRD). Uniform QDs were obtained with density of 1.3 x 1010 /sq cm with optimizing growth conditions. The density of QDs was further increased to ... |
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| Minority Carrier Lifetimes in Halide Chemical Vapor Deposition SiC |
JUN 2006 |
37 pages |
| Authors:
Marek Skowronski; CARNEGIE-MELLON UNIV PITTSBURGH PA OFFICE OF SPONSORED RESEARCH
|
| High purity 6H-SiC single crystals have been grown by the Halide Chemical Vapor Deposition process. Growth was performed using separate injection of silicon silicon tetrachloride and propane. The growth rates were between 100 micrometers/hr and 300 micrometers/hr. The crystals show very low concentrations of residual impurities with the main contaminants, namely nitrogen and boron, in the 1014 cm-3 range. Crystals grown under Si-rich conditions were n-type with low room temperature ... |
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| Halon Replacement Program (HRP) for U.S. Army Ground Combat Vehicles. Report to Halon Options Technical Working Group Conference |
10 MAY 2006 |
18 pages |
| Authors:
Steve McCormick; Mike Clauson; TACOM RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI
|
| Halon 1301 has been used for decades as the primary fire and explosion extinguishing material for a multitude of industrial and military applications. However, halons have very high ozone depleting potentials and their production was stopped in 1994 in most of the world. The U.S. Army Tank-Automotive Research, Development and Engineering Center (TARDEC), the laboratory of the U.S. Army Tank-automotive and Armament Command (TACOM) that conducts research on issues affecting ... |
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| Hydrophobic Silsesquioxane Nanoparticles and Nanocomposite Surfaces (POSTPRINT) |
04 MAY 2006 |
13 pages |
| Authors:
Joseph M. Mabry; Darrell Marchant; Brent D. Viers; Ashwani Vij; Wade Grabow; Patrick N. Ruth; Isha Vij; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| Fluorinated Polyhedral Oligomeric Silsesquioxanes are hydrophobic nanoparticles. One compound, FD8T8, is ultrahydrophobic, possessing a water contact angle of 154 deg. This is believed to be the most hydrophobic and lowest surface tension crystalline substance known. Analysis of the x-ray crystal structure indicates a large number of Si...F contacts may lead to ultrahydrophobicity. |
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| A Multi-Scale Modeling of Laser Cladding Process (Preprint) |
APR 2006 |
42 pages |
| Authors:
J. Cao; J. Choi; MISSOURI UNIV-ROLLA DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
|
| Laser cladding is an additive manufacturing process that a laser generates a melt-pool on the substrate material while a second material, as a powder or a wire form, is injected into that melt-pool. Among all laser manufacture processes, laser cladding offers the most extensive variety of possibilities to alter a component at its surface. Despite immense potentials and advancements, the process model of microstructure evolution and its coupling with macro ... |
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| Classification Characteristics of Carbon Nanotube Polymer Composite Chemical Vapor Detectors |
MAR 2006 |
169 pages |
| Authors:
Huynh A> Hinshaw; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| The first step in combating a chemical weapons threat is contamination avoidance. This is accomplished by the detection and identification of chemical agents. The Air Force has several instruments to detect chemical vapors, but is always looking for lighter, faster, and more accurate technology for a better capability. This research is focused on using carbon nanotube polymer composite sensors for chemical detection. More specifically, models are developed to classify three ... |
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| Low Temperature Reactivities of Ultra-High Temperature Ceramics (Hf-X System) |
MAR 2006 |
11 pages |
| Authors:
Yigal Blum; SRI INTERNATIONAL MENLO PARK CA
|
| A growing interest in ultra-high temperature ceramics and their aerospace and turbine applications has led to a renewal of activities to fabricate MB2/SiC composites as the materials of choice, because of their high thermal and oxidation resistance stability. Unfortunately, these composites are currently formed by an expensive, size and shape limited hot-press operation at a temperature range of 1900 to 2200 degrees C. The project investigated chemical reactions at and ... |
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| Far-Field Spectral Analysis of a Space Shuttle Vernier Reaction Control System Firing |
22 FEB 2006 |
9 pages |
| Authors:
L. S. Bernstein; M. Braunstein; A. L. Broadfoot; W. L. Dimpfl; R. A. Dressler; Y. Chiu; J. A. Gardner; E. Murad; AIR FORCE RESEARCH LAB HANSCOM AFB MA SPACE VEHICLES DIRECTORATE
|
| Near-UV OH(A-X) and NH(A-X) emission bands at ~3100 and 3360 Angstrom, respectively, have been observed in the far-field radiance from the shuttle vernier reaction control system engine exhaust using the GLO imager spectrograph located in the payload bay during the STS-74 mission. Spectra were collected at a resolution of 4 Angstrom for daytime solar illumination conditions during low-Earth-orbit maneuvers. A temporal analysis (2 s temporal resolution) of spectral features is ... |
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| The Predicted Heat of Formation of Several Si-Cl-O-H and Ti-Cl-O-H Species |
25 JAN 2006 |
16 pages |
| Authors:
J. D. Desain; T. J. Curtiss; AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS
|
| The heat of formation at 298K of several possible SiCl4/O2/H2 and TiCl4/O2/H2 species have been calculated by using Moeller-Plesset perturbation theory (MP2) with 6-31G(3df,2p) basis set. The calculated heats of formation are compared to literature values where available and previous calculations that used bond order corrections to empirically improve the heat of formation calculated by Moeller-Plesset perturbation theory. The known species are found to be predicted with fair agreement to ... |
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| Hybrid Molecomputer Using Vapor Phase Assembly |
10 JAN 2006 |
25 pages |
| Authors:
Mark A. Reed; YALE UNIV NEW HAVEN CT GRANT AND CONTRACT ADMINISTRATION
|
| Current work on molecular electronics relies almost entirely on liquid phase processing. Gas phase processing offers far superior uniformity and reproducibility. The scope of this work was to investigate vapor phase process that will fully integrate the in-situ steps of sample preparation, active organic molecule deposition, and gentle gas-moderated metallic overcoating, which will enable our proposed multi-layer stacked device. The goal of this work is to mate these active molecular ... |
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| A Field Program to Identify TRI Chemicals and Determine Emission Factors from DoD Munitions Activities |
JAN 2006 |
164 pages |
| Authors:
Chester W. Spicer; Michael W. Holdren; Anthony S. Wisbith; Kenneth A. Cowen; Bertram T. Jobson; Jan Satola; William R. Bolt; III Sedlacek Arthur J.; Randall J. Cramer; Jason Szabo; BATTELLE MEMORIAL INST COLUMBUS OH
|
| This project was initiated in 2001 to respond to SERDP Statement of Need (SON) CPSON-01-01 to develop and apply an approach to measure emission factors of Toxic Release Inventory chemicals from munitions under realistic conditions of outdoor use on testing and training ranges. This need was driven by Title III of the Superfund Amendments and Reauthorization Act (SARA), which established the Emergency Planning and Community Right-To-Know Act (EPCRA) requiring the ... |
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| Patterning of Biomolecules on Plasma-Enhanced Chemical Vapor Deposited Generated Surfaces |
JAN 2006 |
17 pages |
| Authors:
Joseph M. Slocik; Eric R. Beckel; Hao Jiang; Jesse O. Enlow; Jr. Zabinsky Jeffrey S.; Timothy J. Bunning; Rajesh R. Naika; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
|
| Micropatterned surfaces have received extensive attention for possible applications in advanced technologies including microelectronics, microfluidics, cell growth confinement and biosensor fabrication. The latter two applications exemplify the increasing coordination between materials science and biology for future generation advanced materials. Plasma-enhanced chemical vapor deposition (PECVD) shows great promise for strengthening this aforementioned materials science and biology intersection. PECVD provides an excellent generalized platform for the incorporation of a wealth of different ... |
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| 1.8 kV, 10 mOmega-square cm 4H-SiC JFETs (Preprint) |
JAN 2006 |
8 pages |
| Authors:
James Scofield; Sei-Hyung Ryu; Sumi Krishnaswami; Husna Fatima; Anant K. Agarwal; CREE RESEARCH INC DURHAM NC
|
| Fabrication and characteristics of high voltage, normally-on junction field effect transistors (JFETs) in 4H-silicon carbide (4H-SiC) are presented. The devices were built on 5x10(exp 15) cm(exp -3) doped, 12 micron thick n-type epilayer grown on a n+ 4H-SiC substrate. A specific on-resistance of 10 mOmega-square cm and a blocking voltage of 1.8 kV were measured. Device characteristics were measured for temperatures up to 300 deg C. An increase of specific ... |
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| Multi-Paradigm Multi-Scale Simulations for Fuel Cell Catalysts and Membranes |
JAN 2006 |
19 pages |
| Authors:
III Goddard W.; B. Merinov; A. van Duin; T. Jacob; M. Blanco; V. Molinero; S. S. Jang; Y. H. Jang; CALIFORNIA INST OF TECH PASADENA DIV OF CHEMISTRY AND CHEMICAL ENGINEERING
|
| Dramatically improving the performance of fuel cell systems with their complex heterogeneous structures involving electrocatalysts, proton conducting membrane, reactant, and interfaces between them requires understanding the fundamental chemical, electrochemical, and physical phenomena at the heart of these complex materials and relating these fundamentals to the properties and performance of the membrane electrode assembly. Our goal is to develop a predictive model that can be used to estimate the changes in ... |
|
| Structural Characterization of POSS Siloxane Dimer and Trimer (POSTPRINT) |
2006 |
9 pages |
| Authors:
Stanley E. Anderson; Timothy S. Haddad; Ashwani Vij; Connie Mitchell; Joseph J. Schwab; Michael T. Bowers; CALIFORNIA UNIV SANTA BARBARA DEPT OF CHEMISTRY AND BIOCHEMISTRY
|
| Ion mobility and molecular modeling methods were used to examine the gas phase conformational properties of POSS (Polyhedral Oligomeric Silsesquioxanes) siloxane oligomers. MALDI generated the sodiated dimers [(Cy7T8)sub2]O(dot)Na+ and [(Cp7T8)sub2]O(dot)Na+, and the trimer ion [Cy7T8O-Cy8Si8O11-OCy7T8] Na+ (T = SiO1.5, Cy = cyclohexyl, and Cp = cyclopentyl); their collision cross-sections were measured in helium using ion mobility based methods. Experimental results are consistent with one observed conformer for each of the ... |
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| Low-Voltage Ferroelectric Phase Shifters From L- to C-Band |
2006 |
9 pages |
| Authors:
J. S. Kenney; Yong K. Yoon; Minsik Ahn; Mark G. Allen; Zhiyong Zhao; Xiaoyan Wang; Andrew Hunt; Dongsu Kim; GEORGIA INST OF TECH ATLANTA SCHOOL OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This paper describes the design, fabrication and test results of a family of integrated low voltage ferroelectric phase shifters ranging in frequency of operation from 0.7 GHz to 6 GHz. All devices use a common material system of BaxSr1-xTiO3 (BST) thin-films on Al2O3 (sapphire), allowing integration with high-Q inductors and other passive microwave elements. Novel bias structures have also been developed to reduce the voltages required to tune the materials, ... |
|
| Magneto-Optics of GaAs Quantum Wire Lattices Grown by Selective-Area MOVPE |
2006 |
5 pages |
| Authors:
H. Tamura; S. Nomura; M. Yamaguchi; T. Akazaki; H. Takayanagi; P. Mohan; J. Motohisa; T. Fukui; NTT CORPORATION KANGAWA (JAPAN) NTT BASIC RESEARCH LAB
|
| We report the magneto-optical measurement of GaAs quantum wire lattices of 0.7 micrometer period grown on GaAs(111)B substrates by using the selective-area MOVPE technique. We measure the photoluminescence (PL) spectra at 60 mK from the triangular and the Kagome lattice patterns as well as from the unpatterned single quantum well (SQW) as a reference. While the PL from acceptors is dominant in all the samples, the PL spectra have a ... |
|
| Supercritical Fluids: Nanotechnology and Select Emerging Applications |
2006 |
69 pages |
| Authors:
B. Chehroudi; ENGINEERING RESEARCH AND CONSULTING INC (ERC INC) EDWARDS AFB CA
|
| In this paper, a selected list of emerging applications of supercritical fluids (SCFs) is presented. In particular, demonstrated facts for the promise of the nanoscale science and technology and its overlap or interface with the SCFs technology are presented. It is argued that nanoengineered materials at the nanoscale have mechanical, optical, chemical, and electrical properties quite different from the bulk material. Examples of enhanced performance of many such materials when ... |
|
| Direct-Write Assembly of Three-Dimensional Photonic Crystals: Conversion of Polymer Scaffolds to Silicon Hollow-Woodpile Structures |
20 DEC 2005 |
6 pages |
| Authors:
Gregory M. Gratson; Florencio Garcia-Santamaria; Virginie Lousse; Mingjie Xu; Shanhui Fan; Jennifer A. Lewis; Paul V. Braun; ILLINOIS UNIV AT URBANA-CHAMPAIGN BECKMAN INST AND COORDINATED SCIENCE LAB
|
| Impressive developments in silicon microfabrication are enabling new applications in photonics, microelectromechanical systems (MEMS), and biotechnology. Yet conventional Si microfabrication techniques require expensive masks and time-consuming procedures, including multiple planarization or bonding steps, to generate three-dimensional (3D) structures. In contrast, direct-write approaches, such as laser scanning and ink deposition, provide rapid, flexible routes for fabricating 3D micro-periodic structures. However, these approaches are currently limited to polymeric structures that lack the ... |
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| Molecular Modeling and Experimental Study of Electrocatalytic and Transport Processes in High Temperature Polymer Electrolyte Fuel Cells |
15 DEC 2005 |
35 pages |
| Authors:
Xiangyang Zhou; Rajiv Srivastava; G. P. Philippidis; FLORIDA INTERNATIONAL UNIV MIAMI
|
| The molecular dynamic simulation correctly predicted the permeabilities of hydroniums and methanol in a temperature range between 20 and 1200C. The calculated conductivity data gradually deviated from the experimental values with increasing temperature. The deviations were much less than one order of magnitude in wide ranges of temperature and humidity. The permeability of methanol in new ABPBI membranes is much lower than that in the Nafion 117 membrane. The ABPBI ... |
|
| Research and Development (R&D) on Advanced Nonstructural Materials. Delivery Order 0001: Cleaning Efficiency Study of Malabar International and Pall Corporation Portable Fluid Purifiers |
OCT 2005 |
29 pages |
| Authors:
Jr. Snyder Carl E.; Shashi K. Sharma; Lois Gschwender; George W. Fultz; Timothy Jenney; DAYTON UNIV OH RESEARCH INST
|
| Hydraulic fluids are a critical, safety-of-flight material for all Air Force aircraft. Hydraulically actuated mechanisms are responsible for a large number of aircraft functions ranging from highly sophisticated flight controls to applications such as accessory door actuation. The Air Force alone uses approximately 1,000,000 gallons of hydraulic fluid per year, costing over $12M in procurement and disposal costs. Used hydraulic fluid currently is the second largest waste stream for the ... |
|
| Application of Solid Phase Microextraction Coupled with Gas Chromatography/Mass Spectrometry as a Rapid Method for Field Sampling and Analysis of Chemical Warfare Agents and Toxic Industrial Chemicals |
17 AUG 2005 |
120 pages |
| Authors:
Gary L. Hook; UNIFORMED SERVICES UNIV OF THE HEALTH SCIENCES BETHESDA MD DEPT OF PREVENTIVE MEDICINE AND BIOMETRICS
|
| The first question that must be answered prior to substantive quantitative exposure monitoring, regardless of the sampling and analysis method employed, is: What chemicals are present? In order to answer this question rapidly, there is increasing demand for field analysis of volatile and semi-volatile organic compounds with instrumentation that provides definitive identification. The military's interest in this capability stems from Presidential Review Directive 5 and other Department of Defense implementing ... |
|
| CVC Silicon Carbide Optical Properties and Systems (Preprint) |
29 JUL 2005 |
11 pages |
| Authors:
Jr Foss Colby A.; TREX ENTERPRISES CORP LIHUE HI
|
| The chemical vapor composites (CVC) process provides for the rapid manufacture of near net shape, reduced residual stress silicon carbide (SIC) suitable for high performance optics. The reduction or elimination of residual stress provides several key advantages: 1) increased growth rate, 2) high yields and 3) near net shape deposition of complex geometries. Near net shape deposition allows for fabrication of spherical and aspherical optics without machining of the optical ... |
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| Reformulation of Spectrometric Standards Using Aqueous Raw Materials |
05 JUL 2005 |
23 pages |
| Authors:
Edward Urbansky; JOINT OIL ANALYSIS PROGRAM PENSACOLA FL TECHNICAL SUPPORT CENTER
|
| Rotrode atomic emission spectrometry is used by all three military oil analysis programs to determine wear debris in engine oil. Instruments are calibrated and standardized with a series of chemical standards that are significant expenditures for the program. Raw materials contribute the most to the cost of the end product. Less expensive commercially available aqueous (rather than oleic) products were explored as raw materials. Aqueous formulation was shown to be ... |
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| Elution of Energetic Compounds from Propellant and Composition B Residues |
JUL 2005 |
37 pages |
| Authors:
Alan D. Hewitt; Susan R. Bigl; ENGINEERING RESEARCH AND DEVELOPMENT CENTER HANOVER NH COLD REGIONS RESEARCH AND ENGINEERING LAB
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| Surface soils from two firing points, an artillery impact range, and soils fortified with propellants were evaluated in column elution experiments assessing the release of energetic compounds from melt-cast crystalline explosives and nitrocellulose-based polymeric propellant formulations. Soils obtained from active military ranges were collected at locations identified as potential source zones for energetic residues. The laboratory columns contained 30 g of a silty-sand loam beneath 5.0 g of soil laden ... |
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| Stimuli-Responsive Disassembly of Nanoparticle Aggregates for Light- Up Colorimetric Sensing |
01 JUN 2005 |
8 pages |
| Authors:
Juewen Liu; Yi Lu; ILLINOIS UNIV AT URBANA-CHAMPAIGN BECKMAN INST FOR ADVANCED SCIENCES AND TECHNOLOGY
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| Controlled assembly of nanomaterials has been the focus of much research. In contrast, controlled disassembly has not received much attention, even though both processes have been shown to be important in biology. By using a Pb(2+)-dependent RNA-cleaving DNAzyme, we demonstrate here control of the disassembly of gold nanoparticle aggregates in response to Pb(2+). In the process, we show that nanoparticle alignment plays an important role in the disassembly process, with ... |
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| Coordinated, High-Resolution Studies of Hydrated Sediments |
05 MAY 2005 |
8 pages |
| Authors:
J. F. Gettrust; W. T. Wood; R. Coffin; J. Pohlman; R. Pandey; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS SEAFLOOR SCIENCES DIRECTORATE
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| The Naval Research Laboratory (NRL) has been conducting coordinated investigations of marine gas hydrates based on precise co-location of both direct sediment cores and data from a deep-tow multichannel seismic system. The seismic instrument (known as the Deep Towed Acoustics/Geophysics System (DTAGS)) was developed by NRL to support detailed studies of deep-ocean marine sediments by towing both the seismic source (220Hz - 1kHz, 200 dB //1 square Pa @ 1m ... |
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| Structural Isomers of bis(pentazolyl)iron(II): A Theoretical Study |
22 APR 2005 |
27 pages |
| Authors:
Jerry A. Boatz; Karl Christe; Ashwani Vij; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
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| The High Energy Density Materials (HEDM) Program objectives are: Identifying and developing advanced chemical propellants for rocket propulsion applications; specific impulse (Isp) is the major metric of a propellant's performance; density can also be a significant contributor. |
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| A New Synthesis of Porphyrins with Extended Conjugation and their Photophysics |
21 APR 2005 |
27 pages |
| Authors:
Noboru Ono; EHIME UNIV (JAPAN) DEPT OF CHEMISTRY
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| The contractor investigated the synthesis and characteristics of highly conjugated porphyrins, with the purpose to relate molecular structure to material properties. These molecules useful non-linear optical and optoelectronic properties. The contractor used a synthesis method based on the retro Diels-Alder reaction of porphyrins fused with bicyclo[2.2.2]octadiene units. This yields a new series of conjugated porphyrins that are difficult to be prepared by any other methods. |
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| Hydrolysis of Phosphorus Esters: A Computational Study |
APR 2005 |
33 pages |
| Authors:
J. B. Wright; Gerald H. Lushington; Margaret Hurley; William E. White; EDGEWOOD CHEMICAL BIOLOGICAL CENTER ABERDEEN PROVING GROUND MD
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| Computational chemistry was used to elucidate the reaction paths, transition structures, and energies of activation for the hydrolysis of a series of phosphinate, phosphonate, and phosphate esters. Calculations were performed at the Hartree-Fock level of theory with the density functional theory and 2nd order Moller-Plesset level using the 6-311G(2d.2p) basis set. The SCI-PCM continuum solvation model was also used to determine the roll that solvation plays in stabilizing the various ... |
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| Demonstration of the Anaerobic Fluidized Bed Reactor for Pinkwater Treatment at McAlester Army Ammunition Plant |
MAR 2005 |
53 pages |
| Authors:
Stephen W. Maloney; Robert L. Heine; ENGINEER RESEARCH AND DEVELOPMENT CENTER CHAMPAIGN IL CONSTRUCTION ENGINEERING RESEARCH LAB
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| This report documents a demonstration project conducted at McAlester Army Ammunition Plant in Oklahoma. The technology is based on anaerobic bacteria which attack dissolved explosives such as TNT and RDX at the nitro groups, converting them to amino groups. Once the explosives are transformed, they become amenable to aerobic degradation. This process functions as a pretreatment for the pinkwater, after which the effluent is discharged to an aerobic treatment plant ... |
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| The National Nanotechnology Initiative. Research and Development Leading to a Revolution in Technology and Industry. Supplement to the President's 2006 Budget |
MAR 2005 |
62 pages |
| Authors:
EXECUTIVE OFFICE OF THE PRESIDENT WASHINGTON DC NATIONAL SCIENCE AND TECHNOLOGY COUNCIL
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| The National Nanotechnology Initiative (NNI) is a multi-agency U.S. Government program aimed at accelerating the discovery, development, and deployment of nanoscale science, engineering, and technology. As outlined in the recently completed NNI Strategic Plan, the NNI's goals are to maintain a world-class research and development (R&D) program; to facilitate technology transfer; to develop educational resources, a skilled workforce, and supporting research infrastructure and tools; and to support responsible development of ... |
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Industrial Chemistry and Chemical Processing
