| A Stepwise, Iterative Procedure to Constrain Stress Drop, Regional Attenuation Models, and Site Effects |
30-Sep-2009 |
11 pages |
| Authors:
W S Phillips; Mark D Fisk; ALLIANT TECHSYSTEMS INC SAN DIEGO CA
|
 | Accurate corrections for distance, source size, and site effects are needed for reliable use of regional seismic phases for discrimination and magnitude estimation. Procedures that simultaneously invert for attenuation, geometrical spreading, site, and source parameters have been shown to include many trade-offs and instabilities that have led to significantly inaccurate corrections for distance and source terms. Under previous work, we developed and applied an approach to constrain source parameters, including ... |
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| Cooperative Wideband Spectrum Sensing and Localization Using Radio Frequency Sensor Networks |
Sep-2009 |
109 pages |
| Authors:
Volkan Sonmezer; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis implements spectrum sensing and localization tasks using a radio frequency sensor network and analyzes the performance of this implementation through simulation. A sensor network based cooperative wideband spectrum sensing and localization scheme is proposed for the implementation of the tasks. In the proposed scheme, wavelet-based multi-resolution spectrum sensing and received signal strength-based localization methods, which were originally proposed for cognitive radio applications, are adapted to radio frequency sensor ... |
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| Analysis of Long Wave Infrared (LWIR) Soil Data to Predict Reflectance Response |
Aug-2009 |
43 pages |
| Authors:
Berney; Ernest S IV; Danny W Harrelson; Janet E Simms; Maureen K Corcoran; Ray M Castellane; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS GEOTECHNICAL AND STRUCTURES LAB
|
| The spectral response of quartz is a phenomenon of interest to countermine technologies because of suspected disruption in spectral signature from disturbed soil during emplacement of landmines in the subsurface. The research was divided into two studies: data analysis using spectral information from the Advanced Spaceborne Thermal Emission and Reflection (ASTER) spectral library and a laboratory study using a Fourier transform infrared (FTIR) spectrometer. Spectral and mineralogical data for five ... |
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| The Effects of the Global War on Terrorism on Army Aviation Transformation |
12-Jun-2009 |
76 pages |
| Authors:
Judah Lyons; ARMY COMMAND AND GENERAL STAFF COLL FORT LEAVENWORTH KS
|
| Over the last eight years, combat operations in support of the Global War on Terrorism (GWOT) have put a tremendous strain on the US Army's aviation fleet. In February 2004, the Army canceled the cornerstone of Army Aviation Transformation the $48 billion RAH-66 Comanche Program. In October 2008, the contract for the ARH-70 Arapaho was also canceled. With the cancelation of two helicopter projects in four years, some would argue ... |
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| Intelligence Transition in the United States Army: Are We On the Right Path |
06-Jun-2009 |
54 pages |
| Authors:
Barry Harris; WASHINGTON INST FOR NEAR EAST POLICY DC
|
| This paper examines intelligence transformation in the United States Army and assesses the ability of military intelligence to support full spectrum operations. It analyzes and compares the Army's past, present and future Intelligence structure as well as support to past and ongoing operations. It also compares and contrasts less tangible items such as changes in Military Occupational Specialties, training, culture and mindset. |
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| Subinertial Slope-Trapped Waves in the Northeastern Gulf of Mexico |
Jun-2009 |
12 pages |
| Authors:
Z R Hallock; W J Teague; E Jarosz; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
|
| Current velocity from moored arrays of acoustic Doppler current profilers (ADCPs) deployed on the outer shelf and slope, south of Mobile Bay in the northeastern Gulf of Mexico, shows evidence of alongslope, generally westward-propagating subinertial baroclinic Kelvin waves with periods of about 16 and 21 days, amplitudes of 5-10 cm/sec, and wavelengths of about 500 km. The observed waves were highly coherent over the slope between about 200 and 500 ... |
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| Segue: A Spectroscopic Survey of 240,000 Stars With g = 14-20 |
May-2009 |
24 pages |
| Authors:
SCOTT ANDERSON; Coryn A Bailer-Jones; Steve Bastian; Timothy C Beers; Eric Bell; Vasily Belokurov; Dmitry Bizyaev; Norm Blythe; John J Bochanski; Kurt S Anderson; Deokkeun An; Brian Yanny; Constance Rockosi; Heidi J Newberg; Gillian R Knapp; Jennifer K Adelman-McCarthy; Bonnie Alcorn; Sahar Allam; Carlos A Prieto; William N Boroski; FERMI NATIONAL ACCELERATOR LAB BATAVIA IL
|
| The Sloan Extension for Galactic Understanding and Exploration (SEGUE) Survey obtained nearly equal to 240,000 moderate-resolution (R difference 1800) spectra from 3900 Angstrom to 9000 Angstom of fainter Milky Way stars (14.0 g 20.3) of a wide variety of spectral types, both main-sequence and evolved objects, with the goal of studying the kinematics and populations of our Galaxy and its halo. The spectra are clustered in 212 regions spaced over ... |
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| Vapor-Phase Infrared Absorptivity Coefficient of Pinacolyl Methylphosphonofluoridate |
May-2009 |
23 pages |
| Authors:
Miles; Alan C Samuels; Ronald W Jr; Barry R Williams; Melissa S Hulet; EDGEWOOD CHEMICAL BIOLOGICAL CENTER ABERDEEN PROVING GROUND MD
|
| We measured the vapor-phase absorptivity coefficient of pinacolyl methylphosphonofluoridate, a chemical warfare agent, (GD, Soman) in the mid-infrared (IR) (4000-550 cm') at a spectral resolution of 0.125 cm1. The GD used in the feedstock was purified by fractional distillation and analyzed by nuclear magnetic resonance, gas chromatography (GC)-mass spectrometry, and GC-IR to verify its purity. We describe the experimental method used to acquire the individual spectra that were used to ... |
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| Investigation of Electrical and Optical Properties of Bulk III-V Ternary Semiconductors |
Mar-2009 |
66 pages |
| Authors:
Travis C Gomez; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT/DEPT OF ENGINEERING PHYSICS
|
| Bulk grown III-V ternary semiconductors of In0.08Ga0.92Sb and In0.15Ga0.85As were investigated through Hall-effect and photoluminescence measurements to determine carrier concentration, mobility, sheet resistivity, and luminescence spectrum. In the past, epitaxial layers of ternary compounds have been grown on binary compound substrates, and thus very limited lattice matched ternary alloys were available. Recently, bulk grown ternary substrates have been developed, and it has presented a renewed interest in using these substrates ... |
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| Exploitation of Intra-Spectral Band Correlation for Rapid Feature Selection, and Target Identification in Hyperspectral Imagery |
Mar-2009 |
190 pages |
| Authors:
Michael K Miller; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| This research extends the work produced by Capt. Robert Johnson for detecting target pixels within hyperspectral imagery (HSI). The methodology replaces Principle Components Analysis for dimensionality reduction with a clustering algorithm which seeks to associate spectral rather than spatial dimensions. By seeking similar spectral dimensions, the assumption of no a priori knowledge of the relationship between clustered members can be eliminated and clusters are formed by seeking high correlated adjacent ... |
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| U.S.-Vietnam Relations in 2009: Current Issues and Implications for U.S. Policy |
05-Feb-2009 |
|
| Authors:
Mark E Manyin; LIBRARY OF CONGRESS WASHINGTON DC CONGRESSIONAL RESEARCH SERVICE
|
 | After communist North Vietnam's victory over U.S.-backed South Vietnam in 1975, U.S.- Vietnam relations remained essentially frozen until the mid-1990s. Since then, bilateral ties have expanded to the point where the relationship has been virtually normalized. Indeed, since 2002, overlapping strategic and economic interests have compelled the United States and Vietnam to improve relations across a wide spectrum of issues. Congress played a significant role in the normalization process and ... |
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| Evaluation of the StressWave Cold Working (SWCW) Process on High-Strength Aluminum Alloys for Aerospace |
Feb-2009 |
61 pages |
| Authors:
Eric T Easterbrook; Michael A Landy; STRESSWAVE INC KENT WA
|
| This report was developed under a SBIR contract. A new and innovative cold working process called StressWave Cold Working (SWCW) was investigated and compared to the conventional split sleeve cold working method that is used to enhance the fatigue life of fastener holes in high strength aluminum alloys used on USAF aircraft structures. StressWave cold working was found to be superior in enhancing fatigue lives compared to split sleeve cold ... |
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| Photonic Crystals for Infrared Nonlinear Optics |
Feb-2009 |
|
| Authors:
Yoel Fink; Marin Soljacic; Peter T Rakich; Ayman Abouraddy; Zachary Ruff; Ofer Shopira; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
| Here we summarize our progress in the development of 2- to 5-micron wavelength supercontinuum sources through grant number FA8650-05-C-5426 over the life of the program. The key developments over the past 3 years include 1) A proof-of-principle demonstration of a novel, efficient mid-IR Raman laser source in silica materials system, yielding efficient spectral transfer to 2.41 microns. (The demonstrated system can be naturally extended in wavelength to 5microns and beyond); ... |
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| Wavelength Tuning Limitations in Optically Pumped Type-II Antimonide Lasers |
07-Jan-2009 |
6 pages |
| Authors:
A P Ongstad; R Kaspi; G C Dente; M L Tilton; J R Chavez; R Barresi; AIR FORCE RESEARCH LAB KIRTLAND AFB NM
|
| In this paper, we examine the wavelength tuning limitations of type-II antimonide lasers containing InAs/InGaSb/InAs quantum wells. Wavelength tuning is accomplished by varying the thickness of the InAs electron wells while keeping all else fixed. In principle, these wells can be tuned from lambda approximately equal 2.5 m out to far IR wavelengths by increasing the thickness of the InAs layers. However, a practical upper limit of lambda approximately equal ... |
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| Naval S&T Strategic Plan: Defining the Strategic Direction for Tomorrow |
Jan-2009 |
50 pages |
| Authors:
OFFICE OF NAVAL RESEARCH ARLINGTON VA
|
| The overriding goal of this Naval S&T Strategic Plan is to provide the vision and key objectives guiding the essential science and technology efforts that will assure the continued supremacy of U.S. Naval forces in the 21st century. This plan implements the current guidance and direction of our senior civilian and military leadership. It focuses and aligns Naval S&T with Naval missions and future capability needs that address the complex ... |
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| Laboratory and Numerical Studies of Hydrodynamics Near Jetties |
Jan-2009 |
34 pages |
| Authors:
Zeki Demirbilek; Lihwa Lin; Hajime Mase; Jinhai Zheng; William C Seabergh; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS
|
| Numerical and physical modeling studies were performed by the Coastal Inlets Research Program (CIRP) of the U.S. Army Corps of Engineers to investigate the spatial and temporal behavior of waves and wave-induced currents near jetties of an idealized coastal inlet. Hydrodynamics were examined in the vicinity of two extreme types of jetty structure: a highly absorbing jetty (resembling fairly porous rock rubble structure) and a fully reflective jetty (resembling a ... |
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| Integration of Information Operations in Combat |
Dec-2008 |
121 pages |
| Authors:
Christopher Quick; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The purpose of this thesis is to examine whether the U.S. military is fully integrating information operations in combat operations. Using the organizational theories of Henry Mintzberg and the work of Richard Daft as one frame of reference, and the information theories of Claude Shannon, John Diebold, and Martin Libicki as the second frame of reference, this thesis produced testable propositions to determine which theory had a greater ability to ... |
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| Comparison of NDTI Methodologies to Classify Infrastructure in an Urban Battlespace From Thermal IR Signatures |
Dec-2008 |
9 pages |
| Authors:
Robert Lozar; Michael McInerney; Jonathan Trovillion; ENGINEER RESEARCH AND DEVELOPMENT CENTER CHAMPAIGN IL CONSTRUCTION ENGINEERING RESEARCH LAB
|
| A major challenge of remote infrastructure classification is to distinguish pavements from roofs. We proposed that, due to their differing thermal masses, these elements will heat and cool differently. Therefore, their thermal infrared (IR) signatures will differ throughout a 24-hour cycle. We propose a method to rapidly identify urban infrastructure that will assist the Future Force in dominating the urban battlespace to the same degree that the current force dominates ... |
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| Corrugated QWIP for Tactical Army Applications |
Dec-2008 |
9 pages |
| Authors:
Kwong-Kit Choi; David P Forrai; Darrel W Endres; John J O'Neill; ARMY RESEARCH LAB ADELPHI MD
|
| L-3 Communications Cincinnati Electronics (CE), the Army Research Laboratory (ARL), and the Army Night Vision and Electronic Sensors Directorate (NVESD) have been developing the corrugated quantum well infrared photodetector (C-QWIP) technology for applications in tactical LWIR imaging. The C-QWIP was invented at ARL and shows promise to overcome some of the limitations in commercially available QWIPs. The CQWIP uses micro mirrors on the detector to turn the polarization of the ... |
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| Aligner/Bonder for Fabrication of Nanoscale Spectral and Polarimetric Sensors |
26-Nov-2008 |
5 pages |
| Authors:
Sanjay Krishna; NEW MEXICO UNIV ALBUQUERQUE CENTER FOR HIGH TECHNOLOGY MATERIALS
|
| The Center for High Technology Materials (CHTM) at the University of New Mexico had requested funds to purchase a Mask Aligner/Bond Aligner (for example, Suss-microtech MA-6/BA-6) for development of next generation sensors. The funds from this grant were used to supplement some other funds received from AFOSR and AFRL to purchase a refurbished FC-150 with a solder reflow arm. Although the Pi, Prof. Krishna, worked hard to obtain as much ... |
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| Small-Event Yield and Source Characterization using |
30-Sep-2008 |
10 pages |
| Authors:
Kevin Mayeda; WESTON GEOPHYSICAL LEXINGTON MA
|
| The mission of the Air Force Technical Applications Center (AFTAC) requires accurate yield estimation for nuclear explosions. Historically, the focus has been on larger yield events (m(b) > approx 4.5) using teleseismic body wave magnitudes and applying test-site-specific corrections for yield estimates. The regional coda methodology provides unprecedented stability and avoids test site bias because it is based upon absolute source spectra. Increasingly, however, there is interest in monitoring smaller ... |
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| National Security Strategy: Legislative Mandates, Execution to Date, and Considerations for Congress |
23-Sep-2008 |
|
| Authors:
LIBRARY OF CONGRESS WASHINGTON DC CONGRESSIONAL RESEARCH SERVICE
|
| There is a growing, still highly inchoate, debate among practitioners and scholars, including participants from across the political spectrum, concerning the need to reform the U.S. government s national security system. Reform proponents argue that much of the current architecture was designed to meet the global security challenges of the post-World War II context, and may not be appropriate for addressing 21st-century challenges. That architecture includes the organizations, structures, and ... |
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| Application of Optimization Techniques to Spectrally Modulated, Spectrally Encoded Waveform Design |
01-Sep-2008 |
104 pages |
| Authors:
Todd W Beard; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| A design process is demonstrated for a coexistent scenario containing Spectrally Modulated, Spectrally Encoded (SMSE) and Direct Sequence Spread Spectrum (DSSS) signals. Coexistent SMSE-DSSS designs are addressed under both perfect and imperfect DSSS code tracking conditions using a noncoherent delay-lock loop (DLL). Under both conditions, the number of SMSE subcarriers and subcarrier spacing are the optimization variables of interest. For perfect DLL code tracking conditions, the GA and RSM optimization ... |
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| Holographically Fabricated Photonic Crystals with Large Reflectance |
16-Jul-2008 |
5 pages |
| Authors:
Y C Chen; Geddes; J B III; J T Lee; P V Braun; P Wiltzius; ILLINOIS UNIV AT URBANA-CHAMAPIGN
|
| We report reflection and transmission spectra from three-dimensional polymer photonic crystals fabricated by holographic lithography. The measured peak reflectance matches that predicted by both a finite-difference time-domain method a simple transfer matrix theory and is 70%, significantly higher than previous reports of 30% reflectance. |
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| Vapor-Phase Infrared Absorptivity Coefficient of BIS-(2-Chloroethyl) Sulfide |
01-Jul-2008 |
31 pages |
| Authors:
Alan C Samuels; H D Durst; Barry R Williams; Melissa S Hulet; Ronald W Miles; Frederic J Berg; Leslie McMahon; SCIENCE APPLICATIONS INTERNATIONAL CORP (SAIC) ABINGDON MD
|
| We measured the vapor-phase absorptivity coefficient of the vesicant chemical warfare agent, bis-(2-chloroethyl) sulfide (HD), in the mid-infrared (4000-550/cm) at a spectral resolution of 0.125/cm. The HD used in the feedstock was subjected to a rigorous analysis by gas chromatography (GC) and NMR to verify its purity, and the vapor used to produce the composite spectrum was periodically sampled by GC. In this report, we describe the experimental method employed ... |
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| Breaking the Conflict Cycle: Incorporating Stability Operations into a Cycle Framework |
13-Jun-2008 |
51 pages |
| Authors:
Candy S Smith; ARMY COMMAND AND GENERAL STAFF COLL FORT LEAVENWORTH KS SCHOOL OF ADVANCED MILITARY STUDIES
|
| Failed, failing, and collapsed states and regions all provide opportunities for conflict and intervention in order to promote the security of the United States. Recognizing the opportunity to implement a change in how the United States plans and executes reconstruction and stabilization assistance for foreign states and regions, the President of the United States issued National Security Presidential Directive (NSPD)-44. The result was DoD Directive 3000.5, Military Support for Stability, ... |
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| Observations of Ocean Ambient Noise (10 Hz to 10 kHz) at the Site of a Former Navy Listening Station to the West of Point Sur, California, from January to July of 2007 |
01-Jun-2008 |
55 pages |
| Authors:
Paul Cocker; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Ocean acoustic recordings were obtained from January through June of 2007 at the site of a former Unites States Navy listening station to the west of Point Sur, California. These data were analyzed to determine the characteristics of the ambient acoustic noise. Direct comparisons to previous studies conducted at the same location revealed a near identical match of the pressure spectrum level in the 50 to 120 Hz frequency band ... |
|
| Real-Time Terahertz Imaging Using a Quantum Cascade Laser and Uncooled Microbolometer Focal Plane Array |
01-Jun-2008 |
101 pages |
| Authors:
Barry N Behnken; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Real-time imaging in the terahertz (THz) spectral range was achieved using an uncooled, 160 120 pixel infrared microbolometer camera and a milliwatt-scale quantum cascade laser (QCL). By replacing the camera's original focusing optics with a Tsurupica-based lens and minimizing diffraction effects incurred by the QCL output beam, an imaging scheme was developed in which the camera's focal plane array successfully detected wavelengths that are more than an order of magnitude ... |
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| Temporal-Spectral Detection in Long Wave Infrared Hyperspectral Imagery |
JUN 2008 |
16 pages |
| Authors:
Daniel C. Heinz; Charles E. Davidson; Avishai Ben-David; SCIENCE AND TECHNOLOGY CORP EDGEWOOD MD
|
| Ground-based staring hyperspectral chemical detectors allow for repeated measurements through time with near-perfect image registration. The problem with standard spectral based hyperspectral detection algorithms is that they do not make effective use of this temporal information. In this paper we show that significant improvements in detection performance for staring geometry can be made by making use of statistical information obtained from previous samples and new temporal-spectral detection algorithms are developed. ... |
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| The Sixth Data Release of the Sloan Digital Sky Survey |
APR 2008 |
18 pages |
| Authors:
Jennifer K. Adelman-McCarthy; Marcel A. Agueros; Sahar S. Allam; Carlos A. Prieto; Kurt S. Anderson; Scott F. Anderson; James Annis; Neta A. Bahcall; C. A. Bailer-Jones; Ivan K. Baldry; FERMI NATIONAL ACCELERATOR LAB BATAVIA IL
|
| This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and parameters of roughly 287 million objects over 9583 deg2, including scans over a large range of Galactic latitudes and longitudes. The survey also includes 1.27 million spectra of stars, galaxies, quasars, and blank sky (for sky subtraction) selected ... |
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| Optical Imaging of the Nearshore |
20 MAR 2008 |
6 pages |
| Authors:
Robert A. Holman; OREGON STATE UNIV CORVALLIS COLL OF OCEANIC AND ATMOSPHERIC SCIENCES
|
| This grant supported a variety of studies in the area of littoral processes typically as revealed by the optical remote sensing data of the Argus Program. One principle theme was me development of algorithms for estimating relevant geophysical variables such as longshore currents and wave directional spectra from ground-based optical cameras. The second theme was the study of observed nearshore physics. Much of the latter work focused on the morpho-dynamics ... |
|
| Wireless Robotic Communications in Urban Environments: Issues for the Fire Service |
MAR 2008 |
169 pages |
| Authors:
George Hough; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Firefighters are tasked with conducting search and rescue operations at incidents ranging from minor smoke conditions to multi-agency disasters. In each instance, a rapid risk assessment must be conducted based on preliminary dispatch information. Small lightweight man portable robots are a natural fit for gaining improved situational awareness, yet few have been employed for this application. The problems encountered in using wireless robots in urban environments are among the primary ... |
|
| Investigation of 2-Dimensional Isotropy of Under-Ice Roughness in the Beaufort Gyre and Implications for Mixed Layer Ocean Turbulence |
MAR 2008 |
73 pages |
| Authors:
Timothy P. McGeehan; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The two-dimensional (2D) spectral properties, including the degree of isotropy, of under-ice roughness in the Beaufort Gyre were investigated. Under-ice roughness plays an important role in turbulent ocean heat, salt, and momentum fluxes that determine the delicate balance between surface forcing and the ocean interior that sustains or reduces the perennial ice cover. Accurate characterization of this roughness is important for numerical modeling and prediction of the Arctic air-ice-ocean system, ... |
|
| US Strategy to Deal with Hugo Chavez's Establishment of Militias |
27 FEB 2008 |
35 pages |
| Authors:
Robert D. Peterson; ARMY WAR COLL CARLISLE BARRACKS PA
|
| Hugo Chavez was reelected for another six year term as President of Venezuela in December 2006 and has aggressively put policies in place to remain in power for many years to come. His aggressive Bolivarian Revolution agenda, and anti-US policies, has spread his influence throughout Central and South America in countries like Bolivia, Ecuador, and Nicaragua through democratic elections. After a 2002 failed coups attempt, Hugo Chavez began developing and ... |
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| A Test of Empirical and Semi-Analytical Algorithms for Euphotic Zone Depth with SeaWiFs Data Off Southeastern China |
04 FEB 2008 |
11 pages |
| Authors:
Jingjing Chen; Shaoling Shang; Junwu Tang; ZhongPing Lee; Huasheng Hong; Minhan Dai; Weidong Zhai; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
|
| This study employs SeaWiFS data over the waters off the southern China to evaluate semi-analytical algorithm for euphotic zone depth(Z). This algorithms is based on water's inherent optical properties (IOPs), which can he near-analytically calculated from spectral remote-sensing reflectance, where remote-sensing reflectance can be derived from the normalized water-leaving radiance provided by SeaWiFS. In the Taiwan Strait, compared with in situ Z (+/-3 hour within SeaWiFS collection), average error() is ... |
|
| South China Sea Wave Characteristics During Typhoon Muifa Passage in Winter 2004 |
01-Jan-2008 |
49 pages |
| Authors:
Kuo-Feng Cheng; Peter C Chu; NAVAL POSTGRADUATE SCHOOL MONTEREY CA NAVAL OCEAN ANALYSIS AND PREDICTION LAB
|
| Ocean wave characteristics in the western Atlantic Ocean (Hurricane Region) to tropical cyclones have been investigated extensively, but not the regional seas in the western Pacific such as the South China Sea (Typhoon Region). This is due to the lack of observational and modeling studies in western Pacific regional seas. To fill this gap, Wavewatch-III (WW3) is used to study the response of the South China Sea (SCS) to Typhoon ... |
|
| An Observational Study of the Kuroshio in the East China Sea: Local, Regional, and Basin-Wide Perspectives on a Western Boundary Current |
Jan-2008 |
151 pages |
| Authors:
Magdalena Andres; RHODE ISLAND UNIV NARRAGANSETT GRADUATE SCHOOL OF OCEANOGRAPHY
|
| The Kuroshio is the western boundary current of the North Pacific midlatitude gyre. An observational study of the Kuroshio was conducted using data collected in the East China Sea (ECS) north of Okinawa from December 2002 through November 2004 with an array of inverted echo sounders and acoustic Doppler current profilers. Using these data, Kuroshio velocity structure and transport time series were obtained. Net absolute transport ranges between 4 and ... |
|
| Mixed-Signal Parallel Compressed Sensing and Reception for Cognitive Radio |
Jan-2008 |
5 pages |
| Authors:
Brian M Sadler; Sebastian Hoyos; Zhuizhuan Yu; TEXAS A AND M UNIV COLLEGE STATION DEPT OF ELECTRICAL ENGINEERING
|
| A parallel structure to do spectrum sensing in Cognitive Radio (CR) at sub-Nyquist rate is proposed. The structure is based on Compressed Sensing (CS) that exploits the sparsity of frequency utilization. Specifically, the received analog signal is segmented or time-windowed and CS is applied to each segment independently using an analog implementation of the inner product, then all the samples are processed together to reconstruct the signal. Applying the CS ... |
|
| Army Communicator. Volume 33, Number 1, Winter 2008 |
Jan-2008 |
49 pages |
| Authors:
ARMY SIGNAL CENTER AND FORT GORDON GA
|
| Army Communicator is an authorized, official quarterly professional bulletin of the U.S. Army Signal Center, Fort Gordon, GA. Topics of articles in this issue include: Electromagnetic Spectrum Operations, Net-Centric Warfare, Spectrum Training, Digital Battlefields, and Operational Warfare. |
|
| Quantum State Tomography of a Fiber-Based Source of Polarization-Entangled Photon Pairs |
20-Dec-2007 |
7 pages |
| Authors:
M D Eisaman; J Fan; A Migdall; NATIONAL INST OF STANDARDS AND TECHNOLOGY GAITHERSBURG MD
|
| We report an experimental demonstration of a bright high fidelity single-mode-optical-fiber source of polarization-entangled photon pairs. The source takes advantage of single-mode fiber optics, highly nonlinear microstructure fiber, judicious phase-matching, and the inherent stability provided by a Sagnac interferometer. With a modest average pump power (300 rW), we create all four Bell states with a detected two-photon coincidence rate of 7 kHz per bandwidth of 0.9 nm, in a spectral ... |
|
| Determination of Primary Spectral Bands for Remote Sensing of Aquatic Environments |
20 DEC 2007 |
15 pages |
| Authors:
ZhongPing Lee; K. L. Carder; Robert A. Arnone; MingXia He; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
|
| About 30 years ago, NASA launched the first ocean-color observing satellite: the Coastal Zone Color Scanner. CZCS had 5 bands in the visible-infrared domain with an objective to detect changes of phytoplankton (measured by concentration of chlorophyll) in the oceans. Twenty years later, for the same objective but with advanced technology, the Sea-viewing Wide Field-of-view Sensor (SeaWiFS, 7 bands), the Moderate-Resolution Imaging Spectrometer (MODIS, 8 bands), and the Medium Resolution ... |
|
| An Integrated Architecture to Support Hastily Formed Network (HFN) |
DEC 2007 |
111 pages |
| Authors:
Lim M. Hwee; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis analyzes the nature of Hastily Formed Networks (HFN) and develops a framework and architecture for effective collaboration needs. The analysis considers review of a spectrum of Commercial off-the-shelf (COTS) hardware (including Mobile Command and Control (C2) center and network hardware) and software (i.e., resource optimizing tools) that could support a wider continuum of humanitarian and crisis-relief missions as well as ad-hoc anti-terrorist threats missions Military and Non- Governmental ... |
|
| Suppression of Prostate Tumors by INK4C and PTEN |
DEC 2007 |
22 pages |
| Authors:
Yue Xiong; NORTH CAROLINA UNIV AT CHAPEL HILL
|
| Work during this entire funding period thoroughly characterized mutant mice in the cyclin-dependent kinase (CDK) inhibitor p18Ink4c, which causes hyperplastic cell growth in various tissues including the prostate and the lipid phosphatase Pten, which regulates cell growth and is highly associated with the development of human prostate cancer. The first two years of funding were highly productive and resulted in one manuscript publication supporting a functional collaboration between p18Ink4c and ... |
|
| Assessing the Acceptance and Functional Value of the Asymmetrical Software Kit (ASK) at the Tactical Level |
DEC 2007 |
95 pages |
| Authors:
Peter H. Hopewell; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The Asymmetrical Software Kit (ASK) is a software package built for U.S Army Special Operations Command (USASOC). It is designed to greatly expand and digitize the Intelligence Preparation of the Battlefield (IPB) process for Special Forces units. The purpose of this Thesis is to thoroughly evaluate the Tactical user's acceptance of this technological innovation. Technology Acceptance Model, which psychometrically measures users perceptions of ease-of-use and utility to predict their intention ... |
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| Imaging and Reflectance Spectroscopy for the Evaluation of Effective Camouflage in the SWIR |
DEC 2007 |
|
| Authors:
Ho C. Leong; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The emergence of SWIR (short-wave infrared) sensors and ongoing development of multi-spectral imagers that operate across four wavebands (visible, NIR, SWIR and MWIR) pose new challenges for current camouflage, concealment and deception technologies. For one, they render ineffective conventional camouflage material that worked well in the visible part of the spectrum. The aim of this thesis is to propose means to provide effective camouflage across the visible and SWIR spectrum. ... |
|
| Joint Biological Standoff Detection System increment II: Field Demonstration - SINBAHD Performances |
DEC 2007 |
|
| Authors:
Sylvie Buteau; Jean-Robert Simard; Pierre Lahaie; GILLES ROY; Pierre Mathieu; John McFee; Jim Ho; DEFENCE RESEARCH AND DEVELOPMENT CANADA VALCARTIER (QUEBEC)
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| By the end of the 90s, Defence Research and Development Canada (DRDC) initiated the investigation of a novel LIDAR concept which open the possibility of collecting all at once the detailed spectral information contained in the return signals. This 3-year project called SINBAHD (Stand-off INtegrated Bioaerosol Active Hyperspectral Detection) aimed at evaluating the capability of using UV LIF with intensified range-gated spectrometry to detect and characterize bioaerosol from stand-off position. ... |
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| Origin and Control of the Flow Structure on Unmanned Combat Air Vehicle |
DEC 2007 |
136 pages |
| Authors:
Donald Rockwell; B. Yaniktepe; M. M. Yavuz; T. Goruney; M. A. Kosoglu; Y. Kim; A. Liakopoulos; LEHIGH UNIV BETHLEHEM PA DEPT OF MECHANICAL ENGINEERING AND MECHANICS
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| Flow structure on delta wings having low sweep angle, representative of those used in UCAVs and MAVs, is characterized in detail using; technique of quantitative imaging, high-image-density particle image velocimetry. Cases of stationary wings, wings subjected to control at their trailing-edges, and wings undergoing prescribed pitching maneuvers have been addressed as part of this investigation. The sweep `angle of each wing is sufficiently small, such that the patterns of the ... |
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| Use of L and M Shell Electrons to Trigger Nuclear Spin Isomers |
19 NOV 2007 |
13 pages |
| Authors:
Carl B. Collins; TEXAS UNIV AT DALLAS RICHARDSON CENTER FOR QUANTUM ELECTRONICS
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| Populations of nuclear spin isomers of 178Hfm2 can be triggered to release their stored energies by the absorption of x-rays having energies in the range 9-13 keV. We have found the basic absorption spectrum for triggering to be approximately 0.16% of the cross section for photoionization of the L-shell electrons surrounding the isomeric nuclei. The maximum effect is induced by X-rays with energies exceeding the threshold for the photoionization of ... |
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| Resource-Efficient Digital Communications: Research and Testbed Development in Support of Future Force Warrior and Joint Tactical Radio Systems |
NOV 2007 |
34 pages |
| Authors:
Thomas Fuja; Oliver Collins; Daniel Costello; Yih-Fang Huang; NOTRE DAME UNIV IN DEPT OF ELECTRICAL ENGINEERING
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| This report describes the design and simulation of a bandwidth-efficient waveform suitable for the SLICE radio developed by ITT Aerospace/Communications; this waveform uses quadrature amplitude modulation (QAM) and low-complexity turbo codes developed at Notre Dame. The result is compared with another using continuous phase modulation (CPM). It is shown that the amplifier backoff required for QAM puts it at a disadvantage to CPM at spectral efficiencies where both are feasible ... |
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| Marine Mammal Acoustic Monitoring and Habitat Investigation, Southern California Offshore Region |
NOV 2007 |
42 pages |
| Authors:
John Hildebrand; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
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| The echolocation clicks of five dolphin species found off southern California are described and the use of clicks for species classification is investigated. Spectral and temporal properties are analyzed for the echolocation clicks from short-beaked common, long-beaked common, Risso's, Pacific white-sided and bottlenose dolphins. Two of the species exhibit unique spectral peaks and notches when the complete click is analyzed. A nested ANOVA analysis indicates that spectral peaks and notches ... |
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Reports by Keyword(s)
SPECTRA
