| Z-scan Measurement of the Upconversion Coefficient in Er:YAG |
Sep-2009 |
20 pages |
| Authors:
Jeffrey O White; Robert Dibiano; Alexander B Fick; John E McElhenny; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
 | Solid-state laser research at the U.S. Army Research Laboratory (ARL) is currently emphasizing techniques for power scaling and achieving wavelengths in the eye-safer spectral region. We are studying erbium-doped yttrium aluminum garnet (Er:YAG), because it can be operated with a low quantum defect and has transitions around 1.6 micrometers. However, it suffers from cooperative pair upconversion, which can raise the lasing threshold, and thus lower the output power. In this ... |
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| Measurement and Analysis of Upconversion Rates of Er:YAG at Room Temperature |
Aug-2009 |
14 pages |
| Authors:
M Dubinskii; G A Newburgh; T Sanamyan; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| We have measured upconversion fluorescence resulting from the excitation of room temperature 1% and 5% Er:YAG by a 1532 nm nanosecond pump source. Measurements of the fluorescence decay from the 4I13/2, 4I11/2, 4F9/2 and 4S3/2 manifolds to the 4I15/2 ground state manifold were observed over a wide range of excitation pulse fluence values. A unique set of upconversion parameters were extracted from the measurements using a modification of the traditional ... |
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| Influence of Gas Feed Composition and Pressure on the Catalytic Conversion of CO2 to Hydrocarbons Using a Traditional Cobalt-Based Fischer-Tropsch Catalyst |
25-Jun-2009 |
7 pages |
| Authors:
Heather D Willauer; Dennis R Hardy; Frederick W Williams; Robert W Dorner; Burton H Davis; NAVY TECHNOLOGY CENTER FOR SAFETY AND SURVIVABILITY WASHINGTON DC
|
| The hydrogenation of CO2 using a traditional Fischer-Tropsch Co-Pt/Al2O3 catalyst for the production of valuable hydrocarbon materials is investigated. The ability to direct product distribution was measured as a function of different feed gas ratios of H2 and CO2 (3:1, 2:1, and 1:1) as well as operating pressures (ranging from 450 to 150 psig). As the feed gas ratio was changed from 3:1 to 2:1 and 1:1, the production distribution ... |
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| Identification of the Mechanisms Underlying Antiestrogen Resistance: Breast Cancer Research Partnership between FIU-UM Braman Family Breast Cancer Institute |
Jun-2009 |
13 pages |
| Authors:
Deodutta Roy; FLORIDA INTERNATIONAL UNIV MIAMI
|
| This research proposal has two primary objectives which are to (1) increase FIU investigators' research expertise and competitive ability to succeed as independent breast cancer researchers; and (2) to execute research with the promise of identifying molecular causes of breast tumor resistance to anti-estrogen therapy. This research is of significant merit because of its clinical relevance to breast cancer. Secondly, the research accomplishments through the FIU/BFBCI training program will lead ... |
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| Compressive Optical Imaging Systems -- Theory, Devices and Implementation |
15-Apr-2009 |
34 pages |
| Authors:
David Brady; Richard G Baraniuk; Kevin F Kelly; Rebecca Willett; RICE UNIV HOUSTON TX
|
| In this project we expanded the theory of compressive sensing and explored the connection of CS to advanced optical imaging systems. In regard to theory we incorporated a Hidden Markov Tree signal model into existing CS theory and produced an algorithm for fast signal recover. We physically implemented CS on a single-pixel imaging testbed and analyzed its performance against existing multiplexing schemes. The insight of CS theory and experience in ... |
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| Compressive Optical Imaging Systems - Theory, Devices and Implementation |
Apr-2009 |
34 pages |
| Authors:
David Brady; Richard G Baraniuk; Kevin F Kelly; Rebecca Willett; RICE UNIV HOUSTON TX
|
| In this project we expanded the theory of compressive sensing and explored the connection of CS to advanced optical imaging systems. In regard to theory we incorporated a Hidden Markov Tree signal model into existing CS theory and produced an algorithm for fast signal recover. We physically implemented CS on a single-pixel imaging testbed and analyzed its performance against existing multiplexing schemes. The insight of CS theory and experience in ... |
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| Development of Carbon/Carbon Composites with Through-Thickness Carbon Nanotubes for Thermal and Structural Applications |
Dec-2008 |
34 pages |
| Authors:
Zhiyong (Richard) Liang; Chuck Zhang; FAMU/FSU COLL OF ENGINEERING TALLAHASSEE FL DEPT OF INDUSTRIAL ENGINEERING
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| Carbon/carbon composites offer lightweight thermal protection capable of producing excellent thermal materials. To further improve the thermal conductivity along the thickness direction and the interlaminar shear strength, we studied and demonstrated a novel method to stitch carbon nanotube yarns along the through-thickness direction of carbon fiber two-dimensional precursor felt perform to make novel 3D reinforced carbon/carbon (C/C) composites. By stitching nanotube yarns, high strength and thermal conductive CNTs were incorporated ... |
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| Laser-Pumped Coherent X-Ray FEL |
14-Nov-2008 |
36 pages |
| Authors:
Phillip Sprangle; Joseph Penano; Bahman Hafizi; NAVAL RESEARCH LAB WASHINGTON DC BEAM PHYSICS BRANCH
|
| In a laser-pumped x-ray free electron laser (FEL) an intense laser field replaces the magnetic wiggler field of a conventional FEL. Depending on the intensity and quality of both the electron beam and pump laser, the Thomson backscattered radiation can be coherently amplified. in a conventional FEL, the generation of x-rays requires electron beam energies in the multi-GeV range. In a laser-pumped x-ray FEL, electron beam energies in the multi-MeV ... |
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| Navy Trident Submarine Conversion (SSGN) Program: Background and Issues for Congress |
02-Oct-2008 |
|
| Authors:
Ronald O'Rourke; LIBRARY OF CONGRESS WASHINGTON DC CONGRESSIONAL RESEARCH SERVICE
|
 | The Navy procured 18 Ohio (SSBN-726) class nuclear-powered ballistic missile submarines (SSBNs) between FY1974 and FY1991 to serve as part of the U.S. strategic nuclear deterrent force. They are commonly called Trident submarines because they carry Trident submarine-launched ballistic missiles (SLBMs). The first Trident entered service in 1981, the 18th in 1997. The first 8 (SSBNs 726 through 733) were originally armed with Trident I (C4) SLBMs; the final 10 ... |
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| Qualification of Trivalent Chromate as a Hexavalent Chromate Alternative for Propellant and Cartridge Actuated Devices |
28-Jul-2008 |
62 pages |
| Authors:
Harry L Archer; NAVAL SURFACE WARFARE CENTER INDIAN HEAD DIV MD
|
| A low toxicity trivalent chromate conversion coating (TCP) over a zinc-phosphate conversion coat was qualified to replace toxic hexavalent chromate conversion coating (CCC) on zinc-nickel plated steel. Unpainted test panels exhibited at least 42 days of resistance to cyclic salt fog. These panels lasted at least 4 days when subjected to cyclic sulfur dioxide and cyclic salt fog testing with full red rust evident on the seventh day. Painted and ... |
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| The Rajah Solaiman Islamic Movement (RSIM) and the Rise of Radical Islamic Converts in the Philippines: A Major Security Concern |
01-Jun-2008 |
95 pages |
| Authors:
Jeremy A Bartel; Nayve; Moises M Jr; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| The rise of radical Islamic converts in the Philippines is one of the major security concerns in the Philippines today. The Rajah Solaiman Islamic Movement (RSIM) emerged from various "Balik-Islam" (revert to Islam) organizations that advocate for the conversion of the country to Islam on the belief that the Philippines was an Islamic land prior to western colonization. RSIM, which established links with the various terrorist organizations both in the ... |
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| Navy Trident Submarine Conversion (SSGN) Program: Background and Issues for Congress |
22 MAY 2008 |
|
| Authors:
Ronald O'Rourke; LIBRARY OF CONGRESS WASHINGTON DC CONGRESSIONAL RESEARCH SERVICE
|
| In the covert strike role, the boats can fulfill a substantial portion of the in-theater Tomahawk missile requirements that are established by regional U.S. military commanders, and thereby permit forward-deployed multimission Navy surface combatants and SSNs to concentrate on other missions. The Polk was retired in 1999 at age 33; the Kamehameha was retired in 2002 at age 36. Trident SSGNs and Navy Transformation. The Bush Administration and other supporters ... |
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| Inhibition of Estrogen-induced Growth of Breast Cancer by Targeting Mitochondrial Oxidants |
01-Apr-2008 |
11 pages |
| Authors:
Deodutta Roy; Quentin Felty; Brian Kunkle; FLORIDA INTERNATIONAL UNIV MIAMI
|
| We have completed proposed research of the Second Year Task (iii) and the part of Task (iv) by studying: (a) Foci Formation, (b) Anchorage-independent cell growth, and (c) tumor spheroid formation using new 3D HuBiogel bioassay whether estrogen induced conversion of normal cells to transformed cells is inhibited by treatment with antioxidants, over expression of MnSOD, catalase, PrxIII, Trx2; or mtTFA silencing. Normal breast epithelial cells respond to E2 in ... |
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| ARN VIM IRM Implementation at Kentucky Logistics Operations Center (KYLOC) Central Clothing Distribution Facility (CCDF) |
APR 2008 |
58 pages |
| Authors:
Richard A. Perrin; Robert E. Bona; Dennis A. Brekhus; Douglas D. DeLoach; ADVANTECH INC ANNAPOLIS MD
|
| This Final Technical Report (FTR) covers project work accomplished for the Apparel Research Network (ARN)/Customer Driven Uniform Manufacture (CDUM) project of the Defense Logistics Agency (DLA). The overall project activities for this short term project specifically covered implementing Virtual Item Manager Integrated Retail Module Radio Frequency network in order to provide the Defense Supply Center Philadelphia (DSCP) retail visibility of the DLA owned inventory located at Kentucky Logistics Operation Center ... |
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| Laser Induced Shock Waves and Vaporization in Biological System and Material Science |
30 JAN 2008 |
6 pages |
| Authors:
Bernard S. Gerstman; FLORIDA INTERNATIONAL UNIV MIAMI DEPT OF PHYSICS
|
| Theoretical and computational work was carried out to investigate the underlying physical mechanisms that cause laser induced biological damage and material stress. In order to cause damage to the absorbing material, the electromagnetic energy of the laser pulse must be converted to thermo-mechanical energy. We have developed a computational model that allows the calculation of damage resulting from a laser pulse of any duration or energy due to temperature rise, ... |
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| Binary Chirped Grating Diffractive Element for Sinusoidal to Linear Scanning Conversion: The Beam Propagation Design (Preprint) |
28-Jan-2008 |
15 pages |
| Authors:
William Bailey; Bahareh Haji-saeed; Jed Khoury; John Kierstead; Charles L Woods; AIR FORCE RESEARCH LAB HANSCOM AFB MA SENSORS DIRECTORATE/ELECTROMAGNETICS TECHNOLOGY DIV
|
| We fabricated and tested our previously designed optical correction element with zoom capability to convert nonlinear sinusoidal scans into linear scans. The design methodology is based on derivating a graded index of refraction device as a reference design and converting the graded index of refraction into an amplitude or phase binarized diffractive element. Our graded index of refraction derivation is based on the propagation of an electromagnetic wave in an ... |
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| Unconventional Fossil-Based Fuels. Economic and Environmental Trade-Offs |
Jan-2008 |
|
| Authors:
Michael Toman; Aimee Curtright; David Ortiz; Joel Darmstadter; Brian Shannon; RAND CORP SANTA MONICA CA
|
| Both high import payments for petroleum motor fuels and concerns regarding emissions of carbon dioxide CO2 are motivating interest in possible fuel substitutes. Petroleum products derived from conventional crude oil constitute more than 50 percent of end-use energy deliveries in the United States and more than 95 percent of all energy used in the U.S. transportation sector. Almost 60 percent of liquid fuels are imported. Emissions from the consumption of ... |
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| Ocean Wave Energy Harvesting Devices |
JAN 2008 |
|
| Authors:
Jeffrey T. Cheung; Earl F. Childress III; TELEDYNE SCIENTIFIC AND IMAGING LLC THOUSAND OAKS CA
|
| Development of a mechanically sound buoy design. which generated 10W average power in Beaufort Sea State I. and showed potential for up to 20W in Sea State 4. Development of a wave energy harvesting buoy capable of generating 2W in Sea State I. and with proper mechanical alignment able to generate over 4W. Development of two modeling capabilities: a classical mechanical model used lbr optimizing the electromagnetic design,. and a ... |
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| A Crack Growth Rate Conversion Module: Theory, Development, User Guide and Examples |
SEP 2007 |
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| Authors:
Yu C. Tong; Weiping Hu; David Mongru; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION VICTORIA (AUSTRALIA) AIR VEHICLES DIV
|
| The use of crack growth analysis tools based on plasticity-induced crack closure model, such as FASTRAN, CGAP and AFGROW, requires the conversion of crack growth rate versus the nominal stress intensity range curves to a 'single' curve of crack growth rate versus the effective stress intensity range. In order to minimise the error arising from crack growth rate conversion and judicially utilise these software tools, a user-friendly tool was integrated ... |
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| Conversion and Verification Procedure for Goal-Based Control Programs |
15 AUG 2007 |
19 pages |
| Authors:
Julia M. Braman; Richard M. Murray; CALIFORNIA INST OF TECH PASADENA MATERIALS AND PROCESSES SIMULATION CENTER
|
| Fault tolerance and safety verification of control systems are essential for the success of autonomous robotic systems. A control architecture called Mission Data System, developed at the Jet Propulsion Laboratory, takes a goal-based control approach. In this paper, a method for converting goal network control programs into linear hybrid systems is developed. The linear hybrid system can then be verified for safety in the presence of failures using existing symbolic ... |
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| Autoignition and Combustion of Diesel and JP-8 |
19 JUL 2007 |
51 pages |
| Authors:
Kalyanasundaram Seshadri; CALIFORNIA UNIV SAN DIEGO LA JOLLA OFFICE OF CONTRACT AND GRANT ADMINISTRATION
|
| The Department of Defense directive 4140.25 dated April 12, 2004 mandates that "primary fuel support for land-based air and ground forces in all theaters shall be accomplished using a single kerosene-based fuel, in order of precedence: JP-8, commercial jet fuel (with additive package), or commercial jet fuel (without additives)." The objective of the proposed research is to understand those key aspects of combustion of JP-8 that are required to facilitate ... |
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| Technical Note on Scale Conversion for the Synchronous Impulse Reconstruction (SIRE) Radar |
JUL 2007 |
18 pages |
| Authors:
Kenneth Ranney; Lam Nguyen; Anders Sullivan; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| This technical note describes a calibration method used to convert measurements obtained with the U.S. Army Research Laboratory synchronous impulse reconstruction (SIRE) radar from an integer scale to an absolute, radar cross section (RCS) scale. The required RCS reference point is obtained from highly accurate solutions of Maxwell's equations for a modeled reference target and scene. Electrical characteristics of this modeled target and scene are carefully selected to match those ... |
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| Technical Note on Scale Conversion for the Synchronous Impulse Reconstruction (SIRE) Radar, a Second Method |
JUL 2007 |
18 pages |
| Authors:
Kenneth Ranney; Lam Nguyen; Anders Sullivan; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| This technical note describes a calibration method used to convert measurements obtained with the U.S. Army Research Laboratory (ARL) synchronous impulse reconstruction (SIRE) radar from an integer scale to an absolute, radar cross section (RCS) scale. The required RCS reference point is obtained from highly accurate solutions of Maxwell's equations for a modeled reference target and scene. Electrical characteristics of this modeled target and scene are carefully selected to match ... |
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| Nonlinear Polarization Conversion using Microring Resonators |
08 JUN 2007 |
4 pages |
| Authors:
Chris Fietz; Gennady Shvets; TEXAS UNIV AT AUSTIN DEPT OF PHYSICS
|
| We present a design of a polarization converter between linear, circular, and elliptic accomplished with an on-chip high-Q dielectric microring resonator. Nonlinear polarization switching can be accomplished at modest input intensities because of the high-intensity compression in the ring. We predict an optical bistability effect making the polarization of the transmitted light dependent on its spectral or intensity history. |
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| Basis of Ionospheric Modification by High-Frequency Waves |
JUN 2007 |
21 pages |
| Authors:
S. P. Kuo; POLYTECHNIC UNIV BROOKLYN NY DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| The requirements of achieving ionospheric modification by ground-transmitted HF heating waves are discussed. The directly relevant processes including linear mode conversion and parametric instabilities are explained physically. The nonline & Schrodinger equation for Langmuir waves is reviewed and the initial conditions of two types of nonlinear solutions are discussed; from which the criterion for Langmuir soliton generation is pointed out. |
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| Development of a Fully Interconnected Optical Network Architecture (FIONA) |
07 MAY 2007 |
56 pages |
| Authors:
Mark E. Daniel; NAVAL ACADEMY ANNAPOLIS MD
|
| Networks have been rapidly evolving over the last several decades and continue to do so today. This evolution has been driven by a need for increased performance, as characterized by increased data rates and larger bandwidth. This project focused on the development of a reconfigurable network architecture that connects existing Local Area Networks (LANs) to create an extended LAN. The network uses optical fiber and supports data transparency. This Fully ... |
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| From Service Operational Headquarters to Joint Task Force Capable Headquarters: An Organizational Transition Model |
27-Apr-2007 |
74 pages |
| Authors:
Mark C Strong; OLD DOMINION UNIV NORFOLK VA VIRGINIA MODELING ANALYSIS AND SIMULATION CENTER
|
| The six years of nearly continuous operations in Southwest Asia, coupled with potential global contingencies, have maintained operational requirements for joint command and control, specifically Joint Task Force (JTF) capable headquarters, in excess of available manned, trained, and equipped Service headquarters. The Defense Department, through the 2006 Quadrennial Defense Review, directed the transformation of designated Service operational headquarters into effective and scalable Joint Task Force headquarters capable of immediately commanding ... |
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| Untested Waters: Challenges Facing an Operational Army Reserve |
27 MAR 2007 |
34 pages |
| Authors:
Tracy Thompson; ARMY WAR COLL CARLISLE BARRACKS PA
|
| The Reserve Components of the Army have traditionally been a strategic force. Large scale mobilizations were likely only in times of national crises, such as Operations Desert Storm or Iraqi Freedom. Strategic leaders have ordered a formal conversion of the Army's Reserve Components into an operational force, capable of deploying one year out of every five or six under the Army Force Generation Model. This is a dramatic departure. It ... |
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| Velocity Estimation Using Forward Looking Sonar |
MAR 2007 |
134 pages |
| Authors:
Michael R. Dolbec; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The thesis investigates a method to estimate the forward velocity and heading rate of an autonomous underwater vehicle (AUV). Through relatively new technologies small AUVs are now able to mount a Forward Looking Sonar (FLS) on the vehicle's nose. This can be used for obstacle avoidance and feature based navigation. The sensor can also be used to estimate motion of the AUV, which can be useful for undersea navigation. The ... |
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| Implementing a Multiplexed System of Detectors for Higher Photon Counting Rates |
01-Jan-2007 |
7 pages |
| Authors:
Alan Migdall; Valentina Schettini; Sergey V Polyakov; Ivo P Degiovanni; Giorgio Brida; Stefania Castelletto; NATIONAL INST OF STANDARDS AND TECHNOLOGY GAITHERSBURG MD
|
| Photon counting applications are typically limited by detector deadtime to operate at count rates of a few MHz, at best, and often at significantly lower levels. This limitation is becoming more critical with the advance of photon counting applications such as photon-based quantum information. We present a first experimental proof of principle and review the theoretical foundation of a multiplexed detection scheme that allows photons to be counted at higher ... |
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| Ablation Loss Studies for Capillary - Sustained Plasmas |
NOV 2006 |
18 pages |
| Authors:
Anthony W. Williams; Richard A. Beyer; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| The most common discharge geometry used for efficiently generating plasma from stored electrical energy for gun ignition utilizes a capillary tube to contain, direct, and sustain the discharge. The plasma gas composition is determined by the air in the tube before discharge begins and by materials removed from the capillary tube wall, electrodes, and exploding wire used to start the event. The conductivity of the plasma in the capillary affects ... |
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| Analytical and Practical Analysis of Switched-Capacitor DC-DC Converters |
01 SEP 2006 |
67 pages |
| Authors:
Michael D. Seeman; CALIFORNIA UNIV BERKELEY DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| Switched-capacitor DC-DC converters are useful alternatives to inductor-based converters in many lowpower and medium-power applications. This work develops a straightforward analysis method to determine a switched-capacitor converter's output impedance "a measure of performance and power loss". This resistive impedance is a function of frequency and has two asymptotic limits, one corresponding to very high switching frequency where resistive paths dominate the impedance, and one corresponding to very low switching frequency ... |
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| Design, Implementation and Testing of a Common Data Model Supporting Autonomous Vehicle Compatibility and Interoperability |
SEP 2006 |
359 pages |
| Authors:
Duane T. Davis; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Current autonomous vehicle interoperability is limited by vehicle-specific data formats and support systems. Until a standardized approach to autonomous vehicle command and control is adopted, true interoperability will remain elusive. This work explores the applicability of a data model supporting arbitrary vehicles using the Extensible Markup Language (XML). An exemplar, the Autonomous Vehicle Command Language (AVCL), encapsulates behavior-scripted mission definition, goalbased mission definition, inter-vehicle communication, and mission results. Broad applicability ... |
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| Brothers or Rivals? Iran and the Shi'a of Iraq |
JUN 2006 |
163 pages |
| Authors:
Robert C. Hunter; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis examines the loyalty of the Shi a of Iraq. While some Sunni Arab leaders have recently accused the Shi a of Iraq of pledging loyalty to Iran, in fact the Iraqi Shi a are loyal to their own nation. The Shi a have developed different identities in Iran and Iraq due to different historical legacies and patterns of conversion. Modern religious-based political activists in the two nations have ... |
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| Muslim Prison Ministry: Hindering the Spread of the Radical, Militant, Violent and Irreconcilable Wing of Islam |
25 MAY 2006 |
70 pages |
| Authors:
James K. Dooghan; ARMY COMMAND AND GENERAL STAFF COLL FORT LEAVENWORTH KS SCHOOL OF ADVANCED MILITARY STUDIES
|
| Prisons and detention centers are recruiting grounds for radical Islamists. Unfortunately, the National Military Strategic Plan for the War on Terrorism Campaign Plan is not a sufficient enough strategy to hinder the conversion of detainees into terrorists. However, addressing violent Islamic ideology at the grass roots level may decrease the number of terrorists recruited and increase the number of Muslims favoring a nonviolent interpretation of the Qur'an. The author recommends ... |
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| Conversion of a Mouse Fab into a Whole Humanized IgG Antibody for Detecting Botulinum Toxin |
APR 2006 |
10 pages |
| Authors:
Thomas J. Palys; Kara E. Schmid; John M. Scherer; Randal J. Schoepp; ARMY MEDICAL RESEARCH INST OF INFECTIOUS DISEASES FORT DETRICK MD
|
| Antibodies serve as the gold standard in most immunodiagnostic assays. Recent advances in recombinant DNA technology have offered the production of antibody fragments or Fabs as promising alternatives. However, the lack of the Fc region of the antibody can be difficult in many standard diagnostic platforms. Therefore we sought to convert a murine Fab into a whole humanized IgG. The variable regions from an anti-botulinum Fab were cloned into human ... |
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| The Future of the Ohio Class Submarine |
15 MAR 2006 |
18 pages |
| Authors:
William C. Chinworth; ARMY WAR COLL CARLISLE BARRACKS PA
|
| The Ohio class submarine and its Trident weapons system is an engineering marvel designed to deter the aggression of the former Soviet Union by providing a credible retaliatory strike capability in the event of a nuclear attack. The deterrent effect of the Ohio class submarine was exceptionally successful. Following the collapse of the Soviet Union, the role of the submarine and its weapons system in national strategy is less well ... |
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| Photovoltaically Powered Modulating Retroreflectors |
MAR 2006 |
7 pages |
| Authors:
R. J. Walters; J. L. Murphy; W. S. Rabinovich; G. C. Gilbreath; D. M. Wilt; M. A. Smith; M. J. Krasowski; P. P. Jenkins; D. Schelman; J. H. Warner; NAVAL RESEARCH LAB WASHINGTON DC
|
| Abstract. The development of a photovoltaically PV powered laser communication system that constitutes a miniature, highly energy efficient wireless communication technology is described. The technology is based on the direct integration of a multiquantum well (MQW) modulating retroreflector (MRR) optical communication node and a monolithically integrated module (MIM) PV power source. The MQW MRR optical data link exploits the shift in the MQW absorption peak under an applied reverse bias ... |
|
| A Comparison of Bulk Precipitated Cerium Oxide Powders and Cerium Conversion Coatings and the Influence of Hydrogen Peroxide on Their Formation (Preprint) |
MAR 2006 |
23 pages |
| Authors:
S. A. Hayes; P. Yu; T. J. O'Keefe; J. O. Stoffer; MISSOURI UNIV-ROLLA
|
| To better understand the role of hydrogen peroxide in the formation of cerium conversion coatings and precipitates, hydrated cerium oxide/hydroxide materials obtained from aqueous solutions have been characterized by thermogravimetic methods, X-ray diffraction, and scanning electron microscopy. Powders were prepared by precipitation with sodium hydroxide from cerium (III) chloride solutions using either hydrogen peroxide or oxygen sparging to oxidize Ce(III) species to Ce(IV) species. Cerium conversion coatings were deposited on ... |
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| Navy Aircraft Carriers: Proposed Retirement of USS John F. Kennedy -- Issues and Options for Congress |
21 FEB 2006 |
|
| Authors:
Ronald O'Rourke; LIBRARY OF CONGRESS WASHINGTON DC CONGRESSIONAL RESEARCH SERVICE
|
| The Navy's FY2007 budget proposes retiring the conventionally powered aircraft carrier John F. Kennedy (CV-67) and reducing the size of the carrier force from 12 ships to 11. The Navy's proposed FY2006 budget included a similar proposal. Congress, in acting on the FY2006 defense budget, passed a provision requiring the Navy to maintain a 12-ship carrier force. The issue for Congress for FY2007, as it was for FY2006, is whether ... |
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| Redacting with Confidence: How to Safely Publish Sanitized Reports Converted from Word to PDF |
02 FEB 2006 |
15 pages |
| Authors:
NATIONAL SECURITY AGENCY/CENTRAL SECURITY SERVICE FORT GEORGE G MEADE MD
|
| There are a number of pitfalls for the person attempting to sanitize a Word document for release. This paper describes the issue, and gives a step-by-step description of how to do it with confidence that inappropriate material will not be released. Both the Microsoft Word document format (MS Word) and Adobe Portable Document Format (PDF) are complex, sophisticated computer data formats. They can contain many kinds of information such as ... |
|
| Oxidation of Light Alkanes Using Photocatalytic Thin Films |
2006 |
159 pages |
| Authors:
Troy M. Twesme; WISCONSIN UNIV-MADISON
|
| This investigation studied the photocatalytic oxidation of light alkanes using photocatalytic thin films. In the research presented, nearly complete oxidation of isobutane, n-butane and propane using ZrO2/TiO2 thin films in a single pass reactor was demonstrated. The importance of reactor design on the effectiveness of the photocatalytic reaction is discussed in terms of photocatalyst packing and adequate illumination for catalyst activation. The influence of relative humidity in the contaminant feed ... |
|
| 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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| Efficient Rectenna Design for Wireless Power Transmission for MAV Applications |
DEC 2005 |
|
| Authors:
Lee M. Tan; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF PHYSICS
|
| This thesis is a continuation in part of a NPS project relating to wireless transmission of power to a MAV. The conversion of rf power into usable dc power is done by a rectifying antenna or rectenna. The emphasis of this thesis is an indepth study of all components of the rectenna to determine the limitations of an existing design which has low efficiency, and to determine improvements to the ... |
|
| The Army's Cargo Fleet in World War II |
19 OCT 2005 |
212 pages |
| Authors:
Harold Larson; ARMY CENTER OF MILITARY HISTORY WASHINGTON DC
|
| This monograph on the Army's cargo fleet in World War II contains the following chapters: (I) The Growth and Composition of the Fleet, (II) The Control Status of the Army's Cargo Carriers, (III) Special Types of Cargo Vessels, (IV) Operational Aspects, and (V) Deployment and Utilization. |
|
| Software Vulnerabilities in Java |
OCT 2005 |
|
| Authors:
Fred Long; CARNEGIE-MELLON UNIV PITTSBURGH PA SOFTWARE ENGINEERING INST
|
| Java is essentially a safe language with good security features, However there are several Java features and facilities that can compromise safety if they are misused or improperly implemented. This report briefly describes these potential software vulnerabilities in the current version of Java, Java 5. This brief report is concerned with software vulnerabilities in the current version of Java that is Java 5. Java is essentially a safe language: there ... |
|
| Hysteresis Control of Parallel-Connected Hybrid Inverters |
SEP 2005 |
164 pages |
| Authors:
Bradford P. Little; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Integrated Power Systems will be used on future naval combatants. These systems will allow unprecedented control of shipboard power to propel the ship, sense the battle-space, and engage the enemy. One crucial enabling technology is robust power conversion modules like the hybrid dc to ac inverter. This thesis is a further exploration of the hybrid inverter scheme consisting of a six-step voltage-source inverter (VSI) and a hysteresis controlled current-source inverter ... |
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| Materials and Modulators for True 3-Dimensional Displays |
SEP 2005 |
66 pages |
| Authors:
Michael Bass; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| The research conducted in this program primarily concerned identification of materials that would serve in scalable real time 3D displays. Such materials would have to experience two photon absorption of two different wavelengths near infrared beams of light only at the intersection of the two beams. Upon such excitation the material would have to emit visible light. Our focus on scalable materials led us to first study organic dyes dissolved ... |
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| Ultra-Wideband Analog-to-Digital Conversion Via Signal Expansion |
Sep-2005 |
15 pages |
| Authors:
Brian M Sadler; Sebastian Hoyos; CALIFORNIA UNIV BERKELEY BERKELEY WIRELESS CENTER
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| We consider analog to digital (A/D) conversion, based on the quantization of coefficients obtained via the projection of a continuous time signal over a set of basis functions. The framework presented here for A/D conversion is motivated by the sampling of an input signal in domains which may lead to significantly less demanding A/D conversion characteristics, i.e., lower sampling rates and lower bit resolution requirements. We show that the proposed ... |
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| Navy Trident Submarine Conversion (SSGN) Program: Background and Issues for Congress |
17 AUG 2005 |
7 pages |
| Authors:
Ronald O'Rourke; DEFENSE ACQUISITION UNIV FT BELVOIR VA
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| The Navy's proposed FY2006 budget requests $293 million in procurement funding and $24 million in research and development funding for the Navy's program to refuel and convert four Trident ballistic missile submarines (SSBNs) into cruisemissile- carrying and special operations forces (SOF) support submarines (SSGNs). The total estimated cost of the program, which has been increasing over time, is now $4,018 million. This report will be updated as events warrant. |
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Reports by Keyword(s)
CONVERSION
