| Interband Cascade Laser Photon Noise |
Dec-2008 |
6 pages |
| Authors:
Patrick A Folkes; ARMY RESEARCH LAB ADELPHI MD
|
 | We report measurements of the low-frequency photon noise and the relative intensity noise of an interband cascade laser as a function of laser current at 30 K and 100 K. Away from threshold, the laser primarily exhibits a frequency-independent photon noise spectral density in agreement with theory. At threshold, the observed photon noise spectral density exhibits large fluctuations at closely-spaced discrete frequencies. Thermal effects at 100 K result in a ... |
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| Chip Generators Study |
Dec-2008 |
33 pages |
| Authors:
Mark Horowitz; Don Stark; Zain Asgar; Omid Azizi; Rehan Hameed; Wajahat Qadeer; Ofer Shacham; Megan Wachs; STANFORD UNIV CA COMPUTER SYSTEMS LAB
|
| This report explores a new way to think about designing digital systems, creating chip generators rather than chips, to resolve the crisis facing the chip industry: the need for high energy efficiency pushes us to create customized computing devices tailored to the user's application, while the high cost of design pushes us to using generic computing solutions. Our research indicates that customized solutions can be orders of magnitude better, and ... |
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| Improved UV Nitride Light Emitting Diode With Engineered Spontaneous and Piezoelectric Charges |
Dec-2008 |
8 pages |
| Authors:
Michael Wraback; Paul H Shen; Meredith L Reed; Eric D Readinger; ARMY RESEARCH LAB ADELPHI MD
|
| Most III-V nitride light emitting diodes have an n-type down structure with Ga polarity. In such a device, the active layer is grown on top of the n-cladding layer and the p-type cladding layer is grown on top of the active layer. We have analyzed the band structure of such a device and found a reduced effective conduction band barrier due to the positive spontaneous and piezoelectric polarization charge, resulting ... |
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| Control and Optimization of Coherence of a Nano-Sized Spin-Torque Microwave Oscillator for Military Nano-Electronics |
30-Nov-2008 |
27 pages |
| Authors:
G Gerhart; E Bankowski; V S Tiberkevich; A N Slavin; ARMY RESEARCH DEVELOPMENT AND ENGINEERING COMMAND WARREN MI
|
| Passage of an electric current through a multilayered magnetic nano structure can lead to the excitation of a persistent magnetization precession in the thinner (free) magnetic layer of the structure. The frequency of the excited auto oscillations is close to the ferromagnetic resonance frequency and typically lies in the microwave frequency range. This effect can be used for the development of a novel class of fully metallic microwave nano sized ... |
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| Theoretical Study of the Saturated Stage of a Relativistic Magnetron |
30-Nov-2008 |
149 pages |
| Authors:
D J Kaup; DJ KAUP INC WINTER SPRINGS FL
|
| The saturated stage of a magnetron or a cross-field amplifier is when the device has powered up and is steadily delivering power. Theoretical studies of this stage had suggested that when the dc current would become sufficiently large in comparison with the rf current, then no steady state solution could be expected to exist. Attempts were made to develop a numerical code which would allow one to numerically solve for ... |
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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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| Josephson Phase Qubit Circuit for the Evaluation of Advanced Tunnel Barrier Materials |
21-Nov-2008 |
8 pages |
| Authors:
David P Pappas; Jeffrey S Kline; Hoahua Wang; Seongshik Oh; John M Martinis; NATIONAL INST OF STANDARDS AND TECHNOLOGY BOULDER CO
|
| We have found that crystalline Josephson junctions have problems with control of critical current density that decrease circuit yield. We present a superconducting quantum bit circuit designed to accommodate a factor of five variation in critical current density from one fabrication run to the next. The new design enables the evaluation of advanced tunnel barrier materials for superconducting quantum bits. Using this circuit design, we compare the performance of Josephson ... |
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| Efficient THZ Source Based on Cascaded Optical Down-Conversion in Orientation-Patterned GaAs Structures |
20-Nov-2008 |
34 pages |
| Authors:
Xiaojun Yu; Walter Hurlbut; Vladimir Kozlov; James Harris; Anjie Lin; Paulina Kuo; Joe Schaar; Martin Fejer; Konstantin Vodopyanov; Candace Lynch; David Bliss; Yun-Shik Lee; STANFORD UNIV CA EDWARD L GINZTON LAB OF PHYSICS
|
| The goal of this DARPA TIFT project was to demonstrate an efficient room temperature source for THz imaging systems based on optical down-conversion in an orientation-patterned GaAs microstructure, incorporated into an optical resonant cavity, and pumped by a compact solid state laser. The main achievements are: (1) quasi-phase-matched (QPM) GaAs microstructures with periodic reversal of crystalline orientation, including orientation-patterned GaAs (OPGaAs), diffusion-bonded GaAs (DB-GaAs) and optically-contacted GaAs (OC-GaAs) suitable for ... |
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| Determining Exchange Splitting in a Magnetic Semiconductor by Spin-Filter Tunneling |
20 Nov 2008 |
12 pages |
| Authors:
T S Santos; J S Moodera; K Venkataraman; E Negusse; J Holroyd; J Dvorak; M Lierati; Y U Idzerda; E Arenholz; CALIFORNIA UNIV BERKELEY LAWRENCE BERKELEY LAB
|
| A large exchange splitting of the conduction band in ultrathin films of the ferromagnetic semiconductor EuO was determined quantitatively, by using EuO as a tunnel barrier and fitting the current-voltage characteristics and temperature dependence to tunneling theory. This exchange splitting leads to different tunnel barrier heights for spin-up and spin-down electrons, and is large enough to produce a near fully spin-polarized current. Moreover, the magnetic properties of these ultrathin films ... |
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| Quantum Computing Graduate Research Fellow for Development of a Short Loop Superconducting Fab Process |
14-Nov-2008 |
|
| Authors:
Terry Orlando; Karl Berggren; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
 | This project dealt with nanofabrication by metal-trilayer evaporation and liftoff. It included fabrication of Josephson-junction structures, and development of novel methods for metal liftoff at the sub-10-nm length scale. The ultra-narrow features developed in this project also have direct relevance to the nanofabrication of nanowire phase-slip qubits, which would provide an interesting alternative approach to superconducting qubits. |
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| Prostate Cancer in African-American Men: Serum Biomarkers for Early Detection Using Nanoparticles |
01-Nov-2008 |
18 pages |
| Authors:
Catherine M Phelan; H LEE MOFFITT CANCER CENTER AND RESEARCH INST TAMPA FL
|
| We have blood samples from 40 African-American men with prostate cancer and 30 ethnically-matched control healthy men with questionnaire data on demographics, general health and cancer family history. Our total accrual goal is 100 cases and 200 controls. The use of nanoscale materials and devices has enhanced the lower limits of detection of proteins and other compounds in plasma and tissues. We have investigated using nanoparticles or quantum dots conjugated ... |
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| Effects of Transient Power Extraction on an Integrated Hardware-in-the-Loop Aircraft/Propulsion/Power System |
Nov-2008 |
9 pages |
| Authors:
Mitch Wolff; Michael Corbett; Michael Boyd; John McNichols; Peter Lamm; KRAUSE (P C) AND ASSOCIATES WEST LAFAYETTE IN
|
| As aircraft continue to increase their power and thermal demands, transient operation of the power and propulsion subsystems can no longer be neglected at the aircraft system level. The performance of the whole aircraft must be considered by examining the dynamic interactions between the power, propulsion, and airframe subsystems. Larger loading demands placed on the power and propulsion subsystems result in thrust, speed, and altitude transients that affect the aircraft ... |
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| Polypeptides Based Molecular Electronics |
06-Oct-2008 |
26 pages |
| Authors:
Yeng M Lam; Subodh Mhaisalkar; Lain-Jong Li; Vinayak P Dravid; Gajendra S Shekhawat; Raman Suri; NANYANG TECHNOLOGICAL UNIV (SINGAPORE)
|
| This report discusses use of polypeptide supramolecules that will self assemble from solution and will form molecular wires that exploit quantum mechanical transport mechanisms thus enabling the formation of molecular devices such as transistors, diodes, and sensors. We have designed the peptides, arranged them on substrates using self-assembly, Dip-PEN nanolithography, and also e-beam assisted lithography. The peptides are characterized using AFM and the electrical properties of the self-assembled interconnects are ... |
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| Memory-Based Structured Application Specific Integrated Circuit (ASIC) Study |
Oct-2008 |
58 pages |
| Authors:
Jay Brockman; Peter Kogge; Michael Niemier; Larry Pileggi; NOTRE DAME UNIV IN
|
| According to the ITRS roadmap, 70 percent of the area of a typical ASIC today is memory and this increases to over 90 percent by the end of the roadmap. Yet despite the fact that ASICs are becoming more memory-intensive, commodity memory and ASIC design and manufacturing technologies are still on divergent paths. In this report, we examine methodologies for the design of Memory-Based Structured ASICs (SASICs) that include large ... |
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| Microstructure-Evolution and Reliability Assessment Tool for Lead-Free Component Insertion in Army Electronics |
Oct-2008 |
181 pages |
| Authors:
Krishna Tunga; Suresh K Sitaraman; GEORGIA INST OF TECH ATLANTA OFFICE OF CONTRACT ADMINISTATION
|
| This work aims to understand the reliability of Sn-Ag-Cu solder interconnects used in plastic ball grid array (PBGA) packages using microstructure evolution, laser moire interferometry and finite-element modeling. A particle coarsening based microstructure evolution of the solder joint material during thermal excursions was studied for extended periods of time lasting for several months. The microstructure evolution and particle coarsening was quantified, and acceleration factors were determined between long-term field-use conditions ... |
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| Enforcing Memory Policy Specifications in Reconfigurable Hardware |
Oct 2008 |
28 pages |
| Authors:
Ted Huffmire; Timothy Sherwood; Ryan Kastner; Timothy Levin; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF COMPUTER SCIENCE
|
| While general-purpose processor based systems are built to enforce memory protection to prevent the unintended sharing of data between processes, current systems built around reconfigurable hardware typically offer no such protection. Several reconfigurable cores are often integrated onto a single chip where they share external resources such as memory. While this enables small form factor and low cost designs, it opens up the opportunity for modules to intercept or even ... |
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| The Hospital of the Future. Megatrends, Driving Forces, Barriers to Implementation, Overarching Perspectives, Major Trends into the Future, Implications for TATRC And Specific Recommendations for Action |
Oct 2008 |
94 pages |
| Authors:
Stephen C Schimpff; ARMY MEDICAL RESEARCH AND MATERIEL COMMAND FORT DETRICK MD TELEMEDICINE AND ADVANCED TECH RESEARCH CENTER
|
| In the coming five to fifteen years we can expect that medicine will change dramatically such that it will become custom tailored [also known as 'personalized medicine']; there will be greater emphasis on prevention; medicine's ability to repair, restore or replace organs, tissues and cells will markedly advance; medical information will finally become fully digitized with instant access, anytime and anyplace; healthcare quality and safety will improve dramatically; and, in ... |
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| SOA-Based Optical Logic Circuit Development and Demonstration |
30-Sep-2008 |
|
| Authors:
Erich P Ippen; Leslie A Kolodziejski; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
| In this program, we investigated the fabrication and optical characterization of a photonic integrated circuit (PIC) designed for telecommunication applications using ultrafast (> 100Gbits/s) optical logic. The basic components in the PIC are active components, such as semiconductor optical amplifiers (SOAs), integrated with passive, light-routing waveguides. Optical switching is accomplished by embedding the amplifiers within the arms of Mach-Zehnder interferometers (MZIs), whereas power splitting of propagating signals is carried out ... |
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| Cost and Performance Report of Electrical Resistance Heating (ERH) for Source Treatment. Addendum |
29-Sep-2008 |
48 pages |
| Authors:
Arun Gavaskar; Wendy Condit; Mohit Bhargava; BATTELLE MEMORIAL INST COLUMBUS OH
|
| Electrical Resistance Heating (ERH) was applied at Site 1 located at the U.S. Naval Station Annapolis from January to June 2006. ERH was applied to treat soils and groundwater at depths up to 66 ft below ground surface and contaminated primarily with 1,1,2,2-tetrachloroethane (TeCA), trichloroethylene (TCE), and 1,1,2-trichloroethane (TCA) at the site. This report summarizes the cost and performance data from this ERH application. |
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| Q4 Known Good Substrates |
25-Sep-2008 |
11 pages |
| Authors:
Gilyong Chung; Mark J Loboda; Eric P Carlson; Rebecca S Lauer; DOW CORNING CORP MIDLAND MI
|
| The Known Good Substrates (KGS) Phase II program was initiated 29 August 2007. Wafer, epitaxy, modeling and metrology work has been the main focus of efforts in Q4. At the end of the fourth program quarter DCCSS has achieved step change improvements in crystal quality of 76mm diameter 4H n+ SiC crystals as assessed by MPD and HRXRD. Crystals grown in this quarter now exhibit an MPD range of 1-5/sq ... |
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| Permalloy Film Array Spin Dynamics and High Performance Integrated Microwave Devices |
25-Sep-2008 |
8 pages |
| Authors:
Pingshan Wang; CLEMSON UNIV SC OFFICE OF SPONSORED PROGRAM
|
| Major contributions of this project include (1) the highest permalloy (Py) array FMR frequency reported so far without DC magnetic bias field, and (2) an ultra-sensitive method for ferromagnetic material characterization. Shape-induced high frequency properties of patterned submicron Py arrays are obtained. Py films are sputtered and patterned on gold (Au) transmission lines. Chromium (Cr) is used as adhesion layers for Au and Py deposition. Each Py bar in the ... |
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| Hierarchical Assemblies of Diblock Copolymer-Based Supramolecules in Thin Films |
22-Sep-2008 |
8 pages |
| Authors:
Ting Xu; CALIFORNIA UNIV BERKELEY SPONSORED PROJECTS OFFICE
|
| The hierarchical assemblies of supramolecules, consisted of polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP) with 3-pentadecylphenol (PDP) hydrogen-bonded to the 4VP, were investigated in thin films after solvent annealing in a chloroform atmosphere. The synergistic co-assembly of PS-b-P4VP and PDP was utilized to generate oriented hierarchical structures in thin films. Hierarchical assemblies, including lamellae-within-lamellae and cylinders-within-lamellae, were simultaneously ordered and oriented from a few to several tens of nanometers over macroscopic length scales. The macroscopic ... |
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| Quantum Chemical Study of the Fe(III)-Desferrioxamine B Siderophore Complex-Electronic Structure, Vibrational Frequencies, and Equilibrium Fe-Isotope Fractionation |
19 Sep 2008 |
13 pages |
| Authors:
S D Comagal-Goldman; K W Paul; D L Sparks; J D Kubicki; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| This study presents molecular orbital/density functional theory (MO/DFT) calculations of the electronic structure, vibrational frequencies, and equilibrium isotope fractionation factors for iron desferrioxamine B (Fe-DFO-B) complexes in aqueous solution. In general, there was good agreement between the predicted properties of Fe(III)-DFO-B and previously published experimental and theoretical results. The predicted fractionation factor for equilibrium between Fe(III)-DFO-B and Fe(III)-catecholate at 22 C, 0.68 0.25, was in good agreement with a previously ... |
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| Test Operations Procedure (TOP) 2-1-007 Dynamic Displacement Measurement |
18-Sep-2008 |
21 pages |
| Authors:
ABERDEEN TEST CENTER MD BALLISTICS INSTRUMENTATION DIVISION
|
| This Test Operations Procedure (TOP) describes the selection, setup and operation of the various instrumentation used for measurement of dynamic displacement events, as a part of vehicle live fire vulnerability testing. |
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| International Semiconductor Device Research Symposium (ISDRS) 2007 College Park, MD on 12-14 Dec 2007. Support and Sponsorship |
17-Sep-2008 |
5 pages |
| Authors:
Agis A Iliadis; MARYLAND UNIV COLLEGE PARK DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Revolutionary technologies may be required to sustain the information economy. Markets such as computing, communications, internet, networking, wireless and appliances have primarily driven the microelectronics industry. In addition to sustain these markets, the microelectronics and nanoelectronics industry needs to develop technologies for emerging markets such as medical/health, security, intelligent appliances/ robotics, energy etc. Early recognition of new possibly disruptive technologies for communication and information processing is a critical defense-relevant issue. ... |
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| Terahertz Plasmon-Induced Conductance Effects in Semiconductor Heterostructures |
05-Sep-2008 |
27 pages |
| Authors:
Robert E Peale; UNIVERSITY OF CENTRAL FLORIDA ORLANDO
|
| Experimental investigation of the coupling of free space radiation to surface plasmons by silver or Pd2Si gratings was performed for different grating profiles at CO2 laser wavelengths. Comparison of the results with the theory of Hessel and Liner 1965 and of Wheeler, Arakawa, and Ritchie 1976 suggests that the former gives the more accurate description in the long-wave IR. For that theory, the comparison gives an empirical non-linear relation between ... |
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| Two-Phase Flow in High-Heat-Flux Micro-Channel Heat Sink for Refrigeration Cooling Applications. Part 1: Micro-Channel Heat Sink for Direct Refrigeration Cooling |
01-Sep-2008 |
340 pages |
| Authors:
Issam Mudawar; Jaeseon Lee; Myung Ki Sung; PURDUE UNIV LAFAYETTE IN SCHOOL OF MECHANICAL ENGINEERING
|
| This report examines the pressure drop and heat transfer characteristics of two-phase micro-channel heat sinks. New models and correlations are proposed for both saturated and subcooled boiling conditions. These tools are shown to provide accurate predictions of pressure drop, two-phase heat transfer coefficient and critical heat flux. Also discussed in this report is a new hybrid cooling system that combines the cooling attributes of micro-channel flow and jet impingement. It ... |
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| Two-Phase Flow in High-Heat-Flux Micro-Channel Heat Sink for Refrigeration Cooling Applications. Part 2: Low Temperature Hybrid Micro-Channel/Micro-Jet Impingement Cooling |
01-Sep-2008 |
172 pages |
| Authors:
Issam Mudawar; Jaeseon Lee; Myung Ki Sung; PURDUE UNIV LAFAYETTE IN SCHOOL OF MECHANICAL ENGINEERING
|
| This report examines the pressure drop and heat transfer characteristics of two-phase micro-channel heat sinks. New models and correlations are proposed for both saturated and subcooled boiling conditions. These tools are shown to provide accurate predictions of pressure drop, two-phase heat transfer coefficient and critical heat flux. Also discussed in this report is a new hybrid cooling system that combines the cooling attributes of micro-channel flow and jet impingement. It ... |
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| Low Temperature Photoluminescence and Leakage Current Characteristics of InAs-GaSb Superlattice Photodiodes |
01-Sep-2008 |
20 pages |
| Authors:
P A Folkes; J Little; S Svensson; K Olver; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| We report the results of a study of the temperature-dependent photoluminescence (PL) and leakage current characteristics of a set of type II idium arsenide (InAs)-gallium antimonide (GaSb) superlattice (SL) photodiode structures. We find that the PL efficiency of high-quality structures is determined by Shockley-Read and trap-assisted tunneling nonradiative recombination processes. Our results suggest a possible correlation between trap-assisted tunneling in some SL structures and an anomalous decrease in the PL ... |
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| Closed-Loop Adaptive Optics Control in Strong Atmospheric Turbulence |
01-Sep-2008 |
151 pages |
| Authors:
Todd M Venema; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| A self-referencing interferometer based closed-loop adaptive optics controller is developed which is designed to operate effectively under strong turbulence conditions. The aberrated optical field is modeled stochastically and then estimates of the state of the system are developed using a steady-state, fixed-gain Kalman filter. The phase of the optical field is considered the state of the system which is wrapped in a limited range of (-pi;pi]. This phase is unwrapped ... |
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| ONR D&I Electronics Technology Programs |
01-Sep-2008 |
7 pages |
| Authors:
Jeong Moon; HRL LABS LLC MALIBU CA
|
| Program Status: One of the D&I program goals is to develop greatly improved field-plated MMW GaN HEMT devices with high ft/fmax, which will improve gain/PAE and output power of GaN HEMT MMIC PAs simultaneously. The 6-wafer MMW GaN MMIC lot is competed with the front-side processing and waiting for the back-side processing. |
|
| Continuum Modeling of Elastic Dielectric Solids with Defects, with Application to Barium Strontium Titanate Thin Films |
01-Sep-2008 |
8 pages |
| Authors:
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| A model is developed for the electromechanical behaviour of dielectric crystals with defects: dislocations, vacancies, and misoriented boundaries. A geometric framework describes the deformation of the lattice in the presence of such defects. Thermodynamic and kinetic relations are formulated, the latter enabling description of diffusion of charged vacancies and mass rearrangement at free surfaces. Analytical and numerical solutions of specific problems offer insight into performance of barium strontium titanate (BST) ... |
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| Development of a Profiling Scanner |
01-Sep-2008 |
38 pages |
| Authors:
ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| This report describes the design, operation, and performance of a two-dimensional (2-D) profiling scanner system using 16 laser diodes, 16 photo sensors, and a personal computer (PC) controller. A profiling scanner provides output images that reveal the size, height, and outline or shape of an object. This information can be useful in various military and related applications. The Radiometric Sensor Development and Applications Team of the Sensors and Electron Devices ... |
|
| The Modal Decomposition of the Quality Factor of an Antenna in Prolate Spheroidal Coordinates |
01-Sep-2008 |
61 pages |
| Authors:
R C Adams; P M Hansen; SPACE AND NAVAL WARFARE SYSTEMS CENTER SAN DIEGO CA
|
| This report discusses extending the results for prolate spheroids by including higher order modes and finding the sum of modes giving the minimum radiation Q. There is no coupling between odd and even modes, but there is coupling between the lowest order even modes. The report also presents a simple result for the values of the degree of mixing of modes 2, 4, and 6 that minimizes Q(sub r). |
|
| Wideband Multiport Matching Phase I: Single-Feed Multiport Antennas |
01-Sep-2008 |
64 pages |
| Authors:
J C Allen; J Rockaway; D Arceo; SPACE AND NAVAL WARFARE SYSTEMS CENTER SAN DIEGO CA
|
| Impedance matching is a canonical problem in electrical engineering. The problem is to maximize power flowing from a generator to a load with an adroit design of a matching network. Typically, matching problems use a single-port load. In contrast, this report develops matching for a load with multiple ports. The specific multiport load is a three-wire antenna. Each wire has a feed port so that the load is a 3-port. ... |
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| Photonic Front-End and Comparator Processor for a Sigma-Delta Modulator |
01-Sep-2008 |
85 pages |
| Authors:
Kenny E Escobar; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis examines the role of photonics and integrated optics (IO) for use in analog-to-digital conversion in electronic warfare (EW) intercept receivers. The IO approach uses a continuous wave (CW) distributed feedback (DFB) laser diode at a peak wavelength of 1550 nm to oversample two Mach-Zehnder interferometers (MZIs). The MZIs are part of sigma-delta ( ) modulator-based analog-to-digital converter (ADC) oversampling architecture. A ring resonator accumulator is embedded within a ... |
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| Modeling and Simulation of a Non-Coherent Frequency Shift Keying Transceiver Using a Field Programmable Gate Array (FPGA) |
01-Sep-2008 |
125 pages |
| Authors:
Konstantinos Voskakis; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| In this thesis, the principals of Software Defined Radio are demonstrated by implementing a Binary Frequency Shift Keying (BFSK) receiver-transmitter in a Field Programmable Gate Array (FPGA). After introducing the theory behind the Non- Coherent BFSK demodulation implemented at the receiver, the design of transmitter and receiver is illustrated. The design environment of choice is Mathworks Simulink and Xilinx System Generator, a dedicated library for Mathworks Simulink. The design is ... |
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| Information Sharing for Computing Trust Metrics on COTS Electronic Components |
01-Sep-2008 |
67 pages |
| Authors:
William J McMillon; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The Department of Defense (DoD) has become highly reliant on commercial-off-the-shelf (COTS) technology in mission-critical unclassified systems to reduce both the cost time to acquire a system, and standardize support for deployed systems. It is challenging for the DoD to determine whether and how much to trust in COTS components, given uncertainty and incomplete information about the developers and suppliers of COTS components as well as the capabilities provided by ... |
|
| Design and Implementation of a Motor Incremental Shaft Encoder |
01-Sep-2008 |
119 pages |
| Authors:
La; Andrew M Valley; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The Department of Electrical and Computer Engineering at the Naval Postgraduate School continuously develops new design applications and searches for new ways to arm the students with the tools necessary to gain a greater understanding of advanced motor applications. One such tool is the Student Design Center (SDC). The SDC utilizes Field Programmable Gate Array (FPGA) technology for digital control of motor applications. One of the key factors in motor ... |
|
| Development of a Distributed Digital Array Radar (DDAR) |
01-Sep-2008 |
180 pages |
| Authors:
Pontus Djerf; Ioannis Tornazakis; NAVAL POSTGRADUATE SCHOOL MONTEREY CA GRADUATE SCHOOL OF BUSINESS AND PUBLIC POLICY
|
| Distributed digital arrays have many potential applications in radar and communication systems. The objective of this thesis is to re-examine previous research on distributed digital array radar (DDAR) and evaluate several critical aspects of a proposed wireless architecture. Self-standing transmit/receive (T/R) modules are synchronized wirelessly. An important issue addressed in this thesis is whether a simple low-cost synchronization circuit would perform adequately. To this end two breadboard T/R modules were ... |
|
| Modeling of Electroresistive and Magnetoelectric Oxide Heterostructures |
Sep-2008 |
3 pages |
| Authors:
Evgeny Tsymbal; NEBRASKA UNIV LINCOLN DEPT OF PHYSICS AND ASTRONOMY
|
| Using first-principles calculations we have predicted new functional properties of oxide ferroic heterostructures. One class of heterostructures utilizes an ultrathin ferroelectric film serving as a barrier between two metal electrodes which makes a ferroelectric tunnel junction (FTJ). The electric-field-induced polarization reversal of the ferroelectric is predicted to have a profound effect on the conductance of the junction leading to a new kind of electroresistive switches. Another class of devices extends ... |
|
| High Energy Density Dielectrics for Pulsed Power Applications |
Sep-2008 |
118 pages |
| Authors:
Richard L Wu; Kevin R Bray; K SYSTEMS INC BEAVERCREEK OH
|
| This report was developed under a SBIR contract. Aluminum oxynitride (AlON) capacitors exhibit several promising characteristics for high energy density capacitor applications in extreme environments. Dielectric constants in the range of 9 and dielectric strength in excess of 650 V/micrometer have been demonstrated in our SBIR Phase II program, resulting in material energy densities greater than 14 J/cc. The dielectric properties remain stable from cryogenic temperatures of -200 deg C ... |
|
| Time-Domain Receiver Design for MIMO Underwater Acoustic Communications |
Sep-2008 |
7 pages |
| Authors:
Wen-Bin Yang; T C Yang; Jun Tao; Yahong R Zheng; Chengshan Xiao; MISSOURI UNIV-COLUMBIA DEPT OF ELECTRICAL ENGINEERING
|
| In this paper, we propose a time-domain receiver design scheme for high data rate single carrier multiple-input, multiple-output (MIMO) underwater acoustic communications. In this scheme, each received packet is artificially partitioned into blocks for processing. The MIMO channel is initially estimated using training blocks at the front of transmitted packets from all transducers. With the estimated MIMO channel, one data block following the training blocks is equalized. The phase rotation ... |
|
| Performance of Improved Channel Allocation for Multicarrier CDMA with Adaptive Frequency Hopping and Multiuser Detection |
29-Aug-2008 |
7 pages |
| Authors:
Alexandra Duel-Hallen; Tao Jia; NORTH CAROLINA STATE UNIV AT RALEIGH OFFICE OF CONTRACTS AND GRANTS
|
| Subchannel allocation for the reverse link of multicarrier code-division multiplex-access (MC-CDMA) system with adaptive frequency hopping (AFH) is investigated. An efficient allocation method that can be employed with the matched filter (MF) receiver as well as with multiuser detectors (MUDs) by exploiting the appropriate signal to interference and noise ratio (SINR) analysis is described. It is demonstrated that combined improved subcarrier allocation and the linear decorrelating detector (LDD) are very ... |
|
| Strategies for Closing the ITRS Funding Gap |
Aug-2008 |
4 pages |
| Authors:
Yaw S Obeng; Stephen Martinez de Knight; Joaquin V Pinillos; NATIONAL INST OF STANDARDS AND TECHNOLOGY GAITHERSBURG MD
|
| For over 35 years, each generation of integrated circuits (ICs) has doubled the transistor count while cutting the cost per function in half. This progress, described by Moore's Law, has resulted primarily from scaling device dimensions and wafer size. In reality, Moore's Law is not a law -- it is not based on physical principles and is thus not assured of continuation. For each generation, it works only if the ... |
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| Design, Fabrication and Characterization of High-Performance Silicon Nanowire Transistors |
Aug-2008 |
5 pages |
| Authors:
Yang Yang; Qiliang Li; Xiaoxiao Zhu; Dimitris E Ioannou; Hao D Xiong; John S Suehle; Curt A Richter; GEORGE MASON UNIV FAIRFAX VA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| We report the fabrication and characterization of double-gated Si nanowire field effect transistors with excellent current-voltage characteristics, low subthreshold slope 85 mV/dec and high on/off current ratio 10(exp 6). The Si nanowire devices are fabricated by using a self-aligned technique with standard photolithographic alignment and metal lift-off processes, enabling the large-scale integration of high-performance nanowire devices. We have also studied the effect of device structure and forming gas rapid thermal ... |
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| The Integration of Molecular Electronic Devices With Traditional CMOS Technologies |
Aug-2008 |
5 pages |
| Authors:
N Gergel-Hackett; A A Hill; C A Hacker; C A Richter; NATIONAL INST OF STANDARDS AND TECHNOLOGY GAITHERSBURG MD
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| This work describes the development of hybrid circuits composed of silicon-based molecular electronic devices and traditional CMOS technology. In the development of these circuits, we first fabricated individual CMOS-compatible molecular electronic devices and established their effectiveness. We then designed and used traditional VLSI tools to layout hybrid circuit that includes CMOS for the on-chip characterization of the molecular devices, as well as a platform composed of the contacts and interconnects ... |
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| Correlating Microstructure with Switching Field Distribution in Nanomagnetic Systems with Transmission Electron Microscopy |
Aug-2008 |
3 pages |
| Authors:
June W Lau; NATIONAL INST OF STANDARDS AND TECHNOLOGY GAITHERSBURG MD
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| This paper examines how nominally identical nanostructures can exhibit different switching behaviors in two model systems. The first system consists of an array of perpendicularly magnetized Co/Pd multilayer nanodots. The authors found that the nonuniformity in switching fields among the nanodots in an array is due to a single grain of weak uniaxial anisotropy. In the second system, which consists of inplane magnetized Permalloy nanodot arrays, they found that edge ... |
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| Carbon Nanotube Field Emission Devices With Integrated Gate for High Current Applications |
Aug-2008 |
5 pages |
| Authors:
Niemann; 2 Jeremy 1; /Silan; 2 Jessica L 1; /Killian; 4 3; Darrell L Kevin; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER
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| We present a fabrication technique for the integration of a gate electrode with an array of carbon nanotube (CNT) emitters. These gated cathode structures have high emission current density and may be utilized in X-ray tubes, traveling wave tubes, and ion propulsion systems. The CNT emitters are grown directly on polished bulk metal substrates and are comprised of CNT bundles that are vertically aligned and can be uniformly produced over ... |
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| The Effect of Size Distribution on the Switching Field Distribution of Co/Pd Multilayered Nanostructure Arrays |
Aug-2008 |
3 pages |
| Authors:
Dmitri Litvinov; Darren Smith; James Rantschler; Paul Ruchhoeft; Sakhrat Khizroev; HOUSTON UNIV TX CENTER FOR NANOMAGNETIC SYSTEMS
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| We use Ion Beam Proximity Lithography (IBPL) to produce 4mm x 4mm arrays of 220 nm dots in perpendicularly-oriented Co/Pd multilayered media. IBPL is used to reduce the size distribution sigmaD of the arrays, and subsequently He+ ion irradiation is used to reduce their anisotropy. The Switching Field Distribution sigma(Hcr)/H(Cr) is measured for each sample before and after irradiation, and a linear relationship is experimentally found between sigma(Hcr)/H(Cr) and sigmaD. ... |
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