| Next Generation Highly Conducting Organic Films Using Novel Donor-Acceptor Molecules for Opto-Electronic Applications |
Jun-2009 |
16 pages |
| Authors:
Eric Forsythe; Jianmin Shi; David Morton; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
 | This two-year DRI is intended to address the Army's need for two-dimensional, conformal, large-area electronics by developing techniques that will lead to the printing of conducting organic materials as a primary build-block that will enable such low-cost, large area applications. In the first year, we worked on developing novel organic based molecules using the donor-acceptor design concepts and developing a more fundamental understanding of donor acceptor molecule stacking in order ... |
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| Solution Deposition Methods for Carbon Nanotube Field-Effect Transistors |
Jun-2009 |
32 pages |
| Authors:
Matthew Ervin; Natalie Salaets; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| This study evaluated different methods for controlled deposition of carbon nanotubes (CNTs) from solution onto a silicon substrate to make CNT field-effect transistors (FETs). The goal of this deposition was to achieve reproducible device properties through more uniform CNT densities and other traits. This method serves as an easier, room temperature alternative to chemical vapor deposition growth. Three different types of CNT solutions were spun onto substrates: pristine tubes solubilized ... |
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| Nanodevices from Nanocomponents: Memory Logic and Mechanical Nanodevices |
11-May-2009 |
21 pages |
| Authors:
Charles J O'Connor; Jiye Fang; Leonard Spinu; Weilie Zhou; NEW ORLEANS UNIV LA
|
| The purpose of this report is to document the results of the complete effort for this project, which was to investigate the development of nanodevices from nanoscale components. The project focused on exploring the possibilities of employing nanoparticles and other nanocomponents to fabricate nanodevices. The four main components of the project were: quantum dot memory devices, multilevel logic devices, electromechanical devices, and nanosensor devices. |
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| Research and Infrastructure Development Center for Nanomaterials Research |
May-2009 |
63 pages |
| Authors:
Craig Friedrich; MICHIGAN TECHNOLOGICAL UNIV HOUGHTON DEPT OF MECHANICAL ENGINEERING AND ENGINEERING MECHANICS
|
| Funding for the Center for Nanaomaterials Research at Michigan Technological University commenced on 15 August 2003 under Contract DAAD17-03-C-0115. The progress for the period in each of the thrust areas is detailed. Degrees granted, referred journal publications, refereed conference publications, and invention disclosures are listed with each of the thrust areas. |
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| Theory and Operation of Cold Field-effect Transistor (FET) External Parasitic Parameter Extraction |
May-2009 |
22 pages |
| Authors:
Romeo Rosario; Benjamin D Huebschman; Pankaj B Del Shah; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| The design of monolithic microwave integrated circuits (MMIC) is dependent on the ability to generate accurate device models. Prior knowledge of the external parasitic components is required to determine the small-signal model of the intrinsic device. In this report, we describe a technique and its implementation for extracting external device parasitics. The term cold field-effect transistor (FET) refers to measurements taken when the drain is at the same voltage as ... |
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| Spin-Based Devices for Magneto-Optoelectronic Integrated Circuits |
29-Apr-2009 |
37 pages |
| Authors:
M Holub; D Saha; D Basu; P Bhattacharya; L Siddiqui; S Datta; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING
|
| In this project we have designed and demonstrated several fundamental spintronic devices for the first time. The elemental nature of these devices makes them very versatile and they are suitable for wide range of applications. Key results and accomplishments from this research are highlighted below. * Electrical Injection, Threshold Reduction and Output Circular Polarization Modulation in Quantum Well and Quantum Dot Semiconductor Spin Polarized Lasers working at temperatures up to ... |
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| Spin Torque Nano Oscillators as Potential Terahertz (THz) Communications Devices |
Apr-2009 |
20 pages |
| Authors:
Alma E Wickenden; Chris Fazi; Ben Huebschman; Roger Kaul; Andrew C Perrella; William H Rippard; Matthew R Pufall; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| In this report, we describe the complex impedance of spin torque nano oscillator (STNO) devices. We determined that the STNO is a nonreactive, real-resistance device with single-valued resistance in the broadband frequency range of 500 MHz to 10 GHz (the limit of our test conditions), and that STNOs do not require an external circuit or conjugate matching to operate in a transmitter configuration. We report the first demonstration of the ... |
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| Q5 Known Good Substrates Technical Report |
31-Mar-2009 |
12 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. Subcontractor work on CVD modeling and analysis of epitaxy experiments have been the main focus of efforts in Q6. This technical report summarizes the progress by all team members against the tasks and milestones. This is the final technical quarterly summary for the KGS Phase II program. It is part of the contract extension where consideration was ... |
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| A MEMS Multi-Cantilever Variable Capacitor On Metamaterial |
26-Mar-2009 |
130 pages |
| Authors:
Luke Rederus; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Negative refractive index materials are an example of metamaterials that are becoming increasingly popular. Research into these metamaterials could possibly be the first steps toward bending electromagnetic radiation(i.e., microwaves, light, etc.) around an object or person. Split ring resonators (SRR) are classified as metamaterials that create an artificial magnetic response from materials with no inherent magnetic properties. Once fabricated, an SRR has a specific resonant frequency due to its permanent ... |
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| Removing Redundant Logic Pathways in Polymorphic Circuits |
26-Mar-2009 |
129 pages |
| Authors:
Hanseok Kim; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Evaluating the quality of software and circuit obfuscators is a research goal of great interest. However, there exists little research about evaluation of obfuscation effectiveness through analyzing and investigating redundancies found in the obfuscated variants. In this research, we consider programs represented as structural combinational circuits and then analyze obfuscated variants of those circuits through a tool that produces functionally equivalent variants based on subcircuit selection and replacement. We then ... |
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| Characterizing Component Hiding Using Ancestral Entropy |
26-Mar-2009 |
201 pages |
| Authors:
Jason A Williams; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| In this research, the problem of software protection and the attributes that define that protection is considered. Specifically, how to protect programs defined as structural combinational logic gates. Obfuscation is one technique for protecting such circuits and involves replacing an original circuit with a functionally equivalent variant that has some definable hiding property. The difficulty of reverse engineering versus identifying and recovering the original components or sub-circuits within an original ... |
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| Terahertz Diode Development |
23-Mar-2009 |
24 pages |
| Authors:
Lester F Eastman; Quentin Diduck; Barbaros Aslan; CORNELL UNIV ITHACA NY OFFICE OF SPONSORED PROGRAMS
|
| The research efforts to develop a high-efficiency, moderate power THz device are discussed. The device structure is based upon the crystalline properties of GaN and its ability to handle large power and high fields. Physical device models were developed that include thermal and electrical simulations. Several device structures were produced in conjunction with the model development Initial negative differential conduction results from fabricated devices are presented as are the designs ... |
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| Nanostructures for Enhanced Electron/Hole Conversion |
13-Mar-2009 |
9 pages |
| Authors:
Herbert Kroemer; Arthur C Gossard; CALIFORNIA UNIV SANTA BARBARA DEPT OF MATERIALS
|
| In this program we used molecular beam epitaxy (MBE) to create epitaxial metal-semiconductor structures containing embedded metallic nanoparticles, metallic epitaxial films and epitaxial metal-semiconductor junctions. We incorporated epitaxial metallic nanoparticles of erbium arsenide and erbium antimonide in GaAs, InOaAs and GaSb structures by molecular beam epitaxy. The metallic nanoparticles in semiconductors produced: (1) electrical doping of semiconductors, (2) electron/hole recombination enhancement, (3) electron/hole tunnel junction enhancement. (4) thermal conductivity control, ... |
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| A Theoretical Model Analysis of Absorption of a Three level Diode Pumped Alkali Laser |
Mar-2009 |
116 pages |
| Authors:
Lewis; Charlton D II; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| This paper models the absorption phenomena of light in a three level diode pumped alkali laser system. Specifically this model calculates for a user defined set of system parameters the attenuation of the input pump beam and characteristics of the bleached wave. Using Wolfram's Mathematical 6.0 software all necessary physics for an accurate description of absorption was modeled from first principles: energy levels, cross sections, spin-orbit kinetic processes, saturation frequencies, ... |
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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
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| 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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| The Effects of Temperature and Electron Radiation on the Electrical Properties of AlGaN/GaN Heterostructure Field Effect Transistors |
Mar-2009 |
120 pages |
| Authors:
Jeffrey T Moran; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| AlGaN/GaN Heterostructure Field Effect Transistors (HFETs) have come under increased study, in recent years, owing to their highly desirable material and electrical properties, ruggedness, and survivability even during and after exposure to extreme temperature and radiation environments. These devices or similar devices constructed of AlGaN and/or GaN materials are being researched for their potential applications in many military and space based systems. In this study, unpassivated and SiN passivated Al(0.27)Ga(0.73)N/GaN ... |
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| Bio-Mimetic Millimeter-Scale Flapping Wings for Micro Air Vehicles |
Mar-2009 |
22 pages |
| Authors:
Eric Wetzel; Ronald G Polcawich; Christopher Kroninger; Jeffrey Pulskamp; Jessica Bronson; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| In this report, we present designs of Micro-Electro-Mechanical System (MEMS) fabricated millimeter-scale flapping wings with some characterization of their structural properties and flapping performance. Wings of varied bio-mimetic design, including membrane and ribs-like structures, are flapped at resonance from lead zirconate titanate (PZT) bending actuators at their base. Laser Doppler vibrometer (LDV) measurements and finite element (FE) analysis predictions of the flapping frequencies and mode shapes and the flapping amplitude ... |
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| Design and Development of a Single Channel RSNS Direction Finder |
Mar-2009 |
95 pages |
| Authors:
Jessica A Benveniste; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis carried out the design and development of a single channel Robust Symmetrical Number System (RSNS) virtual spacing direction finding (DF) system. This was based on previous work on a three-channel RSNS virtual spacing DF system. Various moduli sets were chosen and run through MATLAB simulations. The results showed unacceptably large errors at low signal-to-noise ratios (SNRs) for all sets. Large dynamic range moduli sets yielded relatively high errors ... |
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| Field Programmable Gate Array (FPGA) Based Software Defined Radio (SDR) Design |
Mar-2009 |
127 pages |
| Authors:
Durke Wright; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| There are existing wideband communications systems that were built using field programmable gate array (FPGA)- based software defined radio (SDR) designs. Despite the inherent advantages of these systems, some are functionally restricted by limited output bandwidth. This thesis was conceived in order to mitigate the restrictions imposed on such designs. This was accomplished by designing an FPGA-based SDR that can compress sampled intermediate frequency (IF) signals. The compression scheme used ... |
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| Suite of Standards for Electromagnetic Material Characterization Using Mode Matching Theory |
Mar-2009 |
114 pages |
| Authors:
Brian Witthoeft; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| The objective of this research is to determine if an acceptable standard can be developed to access the accuracy and precision of measurements taken using waveguide systems. Tiny changes in material fabrication, processing, and environment can cause problems with accuracy and precision in measurement. There is a great deal of research on uncertainty analysis in the literature. A large portion of the effort will be to determine the levels of ... |
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| Patterning and Characterization of Carbon Nanotubes Grown in a Microwave Plasma Enhanced Chemical Vapor Deposition Chamber |
Mar-2009 |
127 pages |
| Authors:
Mauricio Kossler; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT/DEPT OF ENGINEERING PHYSICS
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| This research studies the growth of carbon nanotubes from a nickel catalyst to be used on a field emission device. A triode structure was created to be able to patterned the CNTs to improve the emission of electrons. Studies are performed on the effects of hydrogen pretreatment on nickel catalyst of different thicknesses and deposition methods on a silicon substrate and how it will affect the growth of carbon nanotubes ... |
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| Power Generation by Harvesting Ambient Energy with a Micro-Electromagnetic Generator |
Mar-2009 |
116 pages |
| Authors:
James Shields; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| This thesis investigated the potential power output of micro-electromagnetic generators fabricated using typical microfabrication materials and techniques. The design was intended to eliminate the need for batteries in bio-implanted or remote electronic devices. Such a micro-generator could harvest ambient energy and power such devices inde?nitely. Using electromagnetic theory, designs for the magnet's stator coil and rotor magnets were optimized to produce maximum current density. A method for overlaying two evaporated ... |
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| Dynamic Interactions for Network Visualization and Simulation |
Mar-2009 |
111 pages |
| Authors:
Cigdem Yetisti; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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| This research effort examines related interface studies, interactive techniques and visualization functions to present the design, development and implementation of a new network visualization framework design. From the interface design perspective, this research presents a prototype design to ease the implementation process. The prototype design is introduced to attempt to better facilitate using multiple network visualization functions meeting user needs. With the usage of the mediator tool, the new network ... |
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| Detecting Near-Earth Objects Using Cross-Correlation with a Point Spread Function |
Mar-2009 |
72 pages |
| Authors:
Anthony O'Dell; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT/DEPT OF ENGINEERING PHYSICS
|
| This thesis describes a process to help discover Near-Earth Objects (NEOs) of larger than 140 meters in diameter from ground based telescopes. The process involves using Nyquist sampling rate to take data from a ground-based telescope and measuring the atmospheric seeing parameter, r(0), at the time of data collection. r(0) is then used to create a point spread function (PSF) for a NEO at the visual magnitude limit of the ... |
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| Interrupt Driven RS-232, Pulse Width Modulation, and Control Processing on a Single 8-bit PIC Chip |
Mar-2009 |
22 pages |
| Authors:
Justin Shumarker; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD VEHICLE TECHNOLOGY DIRECTORATE
|
| Autopilots utilizing a single processor allow for smaller, lighter, more cost-effective designs than those using multi-processor architecture. Presented here is a software architecture that allows multiple tasks to operate in a real-time mutually exclusive environment using a single 8-bit processor. This type of architecture will be utilized to create an autopilot using a single processor and sensors. The problem is preventing individual tasks from interfering with one another in a ... |
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| Characterization of Hardening by Design Techniques on Commercial, Small Feature Sized Field-Programmable Gate Arrays |
Mar-2009 |
69 pages |
| Authors:
Thomas E Simmons; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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| This thesis experimentally tests and evaluates programmable logic devices under gamma irradiation to determine radiation effects and characterize improvements of various hardening by design techniques - Error Correction Coding(ECC) and Triple Modular Redundancy (TMR). The TMR circuit includes three different functional implementations of adders compared to TMR voted circuits of those same adders. The TMR is implemented with the same functional adders and as a Functional TMR (FTMR) with three ... |
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| Inverse Source Problem in Non-homogeneous and Metamaterial Background Media: Antenna Synthesis and Performance Bounds |
28-Feb-2009 |
22 pages |
| Authors:
Edwin A Marengo; Anthony Devaney; NORTHEASTERN UNIV BOSTON MA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The central goal of this project was the investigation of the enhancements in antenna performance and in imaging capability by embedding a source or scatterer in a background medium including metamaterials. This effort was motivated mostly by the possibility of embedding antennas in designer background media so as to obtain radiation performance that would not be possible for comparable antennas in free space. This problem was treated in the present ... |
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| Analysis of Implicit Modeling of Complex Geometric Environments |
28-Feb-2009 |
29 pages |
| Authors:
Gregory M Nielson; ARIZONA STATE UNIV TEMPE
|
| 1. Developed methods for extracting mathematical surface description of urban/terrain implicitly defined from scattered point cloud data obtained from scanners and other detecting devices 2. Developed methods for parameterizing surfaces representing urban/terrain environments which are implicitly modeled. 3. Developed a custom software environment for simulating scanner output producing point cloud data sets. 4. Developed and analyzed adaptive, implicit mathematical methods for modeling data scanned from complex geometric environment. 5. Developed, ... |
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| Programmed Pathogen Sense and Destroy Circuits |
18-Feb-2009 |
24 pages |
| Authors:
Ron Weiss; TRUSTEES OF PRINCETON UNIV NEW JERSERY
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| We are creating an anti-microbial sense-and-destroy system by engineering sentinel/killer cells that detect the presence of pathogenic bacteria, report the identity of the pathogen with a coded output signal, and secrete specific bacteriocins/lysins that destroy the pathogen. Engineering cells for detection and targeted destruction of pathogens offers a single integrated solution to eradicate multiple threats with an approach that is a rapid, selective, and highly sensitive. We are engineering a ... |
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| United States Government Support of Pickens' Energy Plan |
18-Feb-2009 |
34 pages |
| Authors:
Matthew N Smith; ARMY WAR COLL CARLISLE BARRACKS PA
|
| Billionaire T. Boone Pickens began a media campaign in July, 2008 to convince the American public and U.S. Congress that the nation should embark on a plan to displace one-third of its oil imports with wind energy within ten years. The plan calls for wind turbines to generate 20 percent of the nation's electricity. This new wind energy will free natural gas, currently used in electricity generation, to replace 47 ... |
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| Four-Channel Threshold Detector With Optical Isolation |
Feb-2009 |
26 pages |
| Authors:
Mark R Morgenstern; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| The four-channel window comparator discussed in this report is a safety switch that can be used to limit a range of test variables such as voltages, currents, temperatures or other values that can be scaled to a voltage within +-13 V. This device is simple, reliable, rugged, and requires no external control hardware or software. This module is scalable and reconfigurable to support nearly any test apparatus. |
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| A Two-Dimensional Deoxyribonucleic Acid (DNA) Matrix Based Biomolecular Computing and Memory Architecture |
Feb-2009 |
25 pages |
| Authors:
Anthony Macula; Russell Deaton; Junghuei Chen; STATE UNIV OF NEW YORK AT ALBANY RESEARCH FOUNDATION
|
| The primary goal of this research was the development of an enabling technology for DNA computing. It focused on the development of two distinct DNA-based nanotechnologies, aqueous computing and DNA arrays. Once merged, these DNA-based nanotechnologies serve as a platform for a hybrid silicon-DNA computing architecture. The aqueous side is where the computing happens and the array side is where the results are preprocessed. The array information passes to an ... |
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| Identification of Text and Symbols on a Liquid Crystal Display. Part 2. Contrast and Luminance Settings to Optimise Legibility |
Feb-2009 |
23 pages |
| Authors:
Kingsley Fletcher; Stuart Sutherland; Karen Nugent; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) MARITIME OPERATIONS DIV
|
| This study aimed to identify the luminance and contrast levels necessary to minimise the threshold identification size of bright letters displayed over a dark background on an LCD under low (1.5 lux) and high (260 lux) lighting conditions. White, pure red, pure green and pure blue upper-case Bailey Lovie letters with a contrast between 3:1 and 300:1 were displayed on an LCD to 20 participants. The threshold identification size was ... |
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| Oxide Semiconductors with Non-Volatile Resistance Switching |
Feb-2009 |
23 pages |
| Authors:
M Skowronski; J A Bain; P A Salvador; CARNEGIE-MELLON UNIV PITTSBURGH PA
|
| Metal-oxide-metal hetero-structures have been deposited by Pulsed Laser Deposition and sputtering and their I-V and switching characteristics investigated as a function of active oxide layer, top metal electrode type and structure, and oxide thickness. Non-volatile switching has been observed for structures containing (Pr,Ca)Mn03, (La,Ca)Mn03, (La,Sr)Mn03, Sr(Zr,Cr)03 and SrTi03 as the active layer and Mg, Cr, Cu, Ag, and Pt as the top metal. The electrical transport was due to space ... |
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| Embedded Meta-Material Antennas |
31-Jan-2009 |
21 pages |
| Authors:
Dennis W Prather; DELAWARE UNIV NEWARK
|
| With the dawn of the Digital Battlefield, a critical capability in the modern warfare environment is the miniaturization of electronic warfare signal and information processing systems. To realize such systems, the key is to miniaturize antennas that transmit and receive signals. In particular, by introducing reconfigurable antennas, one can combine multiple antennas operating at various frequency bands into a single aperture, which can provide significant miniaturization and flexibility to the ... |
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| Ramadi 132-Kilovolt Substation Ramadi, Iraq |
27-Jan-2009 |
36 pages |
| Authors:
Angelina Johnston; Justin Chenault; OFFICE OF INSPECTOR GENERAL ARLINGTON VA SPECIAL INSPECTOR GENERAL FOR IRAQ RECONSTRUCTION
|
| This project assessment was initiated as part of SIGIR's continuing assessments of selected sector reconstruction activities for the electricity sector. The overall objectives were to determine whether selected sector reconstruction contractors were complying with the terms of their contracts or task orders and to evaluate the effectiveness of the monitoring and controls exercised by administrative quality assurance and contract officers. |
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| Time-Reversal Based Range Extension Technique for Ultra-Wideband (UWB) Sensors and Applications in Tactical Communications and Networking |
16-Jan-2009 |
49 pages |
| Authors:
Peng Zhang; Nan Guo; Zhen Hu; Yu Song; Robert C Qui; TENNESSEE TECHNOLOGICAL UNIV COOKEVILLE
|
| This report summarizes our research and development work in the last quarter of year 2008. We have reached a practical limit in terms of sampling rate and bandwidth. Listed below are major achievements during the quarter: (1) improved waveform generator: FPGA coding with respect to readability, quantization at the transmitter has been increased from ternary to 8-bit, and sampling rate has been increased from 500 Ms/s to 1 Gs/s; (2) ... |
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| Electron Spins in Single Electron Transistors |
14-Jan-2009 |
6 pages |
| Authors:
Marc A Kastner; MASSACHUSETTS INST OF TECH CAMBRIDGE MA SCHOOL OF SCIENCE
|
| Measurements of a single electron spin showed that the excited spin state in a GaAs single electron transistor can live for as long as 1s. However, the decoherence time in the excited state is known to be short, because of the coupling to nuclear spins. Therefore, single-electron transistors in Si quantum wells have been fabricated; it is possible in principle to make the decoherence time very long by using isotopically ... |
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| Proceedings of the Antenna Applications Symposium (32nd) Held in Monticello, Illinois on 16-18 September 2008. Volume 2 |
20-Dec-2008 |
265 pages |
| Authors:
Daniel Schaubert; J D Wolf; T L Roach; J T Bernhard; D Filipovic; G Potvin; D Fontaine; Y Saito; J-M Rollin; L M Paulsen; M J Buckley; M W Elsallal; J B West; R J Mailloux; S G Santarelli; T M Roberts; D Luu; M Stasiowski; D Schaubert; Z Popovic; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The Proceedings of the 2007 Antenna Applications Symposium is a collection of state-of-the art papers relating to antenna arrays millimeter wave antennas simulation and measurement of antennas integrated antennas and antenna bandwidth and radiation improvements. |
|
| Proceedings of the Antenna Applications Symposium (32nd) Held in Monticello, Illinois on 16-18 September 2008. Volume 1 |
20-Dec-2008 |
279 pages |
| Authors:
M W Elsallal; T L Roach; J T Bernhard; D Filipovic; G Potvin; D Fontaine; Y Saito; J-M Rollin; Z Popovic; J D Wolf; L M Paulsen; J B West; R J Mailloux; S G Santarelli; T M Roberts; D Luu; M Stasiowski; D Schaubert; M J Buckley; D H Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The Proceedings of the 2008 Antenna Applications Symposium is a collection of state-of-the art papers relating to antenna arrays, millimeter wave antennas, simulation, and measurement of antennas integrated antennas and antenna bandwidth and radiation improvements. |
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| Complexity-Enabled Sensor Networks and Photonic Switching Devices |
20-Dec-2008 |
23 pages |
| Authors:
D J Gauthier; DUKE UNIV DURHAM NC OFFICE OF RESEARCH SUPPORT
|
| The researchers have demonstrated that a holistic, complexity-based design approach can lead to improved functionality or sensitivity of devices. They have developed two different types of devices, each of which is optimized for different applications: an opto-electronic chaotic oscillator that can be used as a building block for an intrusion detection network; and an ultra-low-light-level photonic switch for quantum information networks. Although these devices are quite different, they are both ... |
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| Stochastic Magnetization Dynamics Excited by Spin-Polarized Current in Magnetic Nano-Structures |
17-Dec-2008 |
13 pages |
| Authors:
Andrei M Slavin; OAKLAND UNIV ROCHESTER MI DEPT OF PHYSICS
|
| The work is devoted to theoretical research leading to the fundamental understanding of the influence of thermal noise on the performance of nano-sized spin-torque microwave oscillators for military and space applications. In contrast with the existing theories, the developed theory is not be based on the assumption that the noise power is much smaller than the power generated by the oscillator. The theory takes into account strong nonlinearity of nano-scale ... |
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| Adaptive Filter Techniques for Optical Beam Jitter Control and Target Tracking |
Dec-2008 |
117 pages |
| Authors:
Michael J Beerer; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The objective of this research is to develop advanced control methods to attenuate laser beam jitter using a fast-steering mirror. Adaptive filter controllers using Filtered-X Least Mean Square (FX-LMS) and Filtered-X Recursive Least Square (FX-RLS) algorithms are explored. The disturbances that cause beam jitter include mechanical vibrations on the optical platform (narrowband) and atmospheric turbulence (broadband). Both feedforward filters (with the use of auxiliary reference sensor(s)) and feedback filters (with ... |
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| Reduced Precision Redundancy Applied to Arithmetic Operations in Field Programmable Gate Arrays for Satellite Control and Sensor Systems |
Dec-2008 |
175 pages |
| Authors:
Margaret A Sullivan; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis examines two problems in on-board computing for space vehicles and develops rules for applying Reduced Precision Redundancy (RPR) as a new method of fault tolerance in Field Programmable Gate Arrays against Single Event Effects due to radiation on orbit. RPR was discovered by Snodgrass in 2006 and was first demonstrated using the single-input CORDIC algorithm. This research applies RPR to elementary multiple-input arithmetic operations (addition, subtraction, multiplication, division) ... |
|
| A Validation of a Molecular Dynamics Simulation in Determining the Thermal Conductivity of a La-Zr Pyrochlore |
Dec-2008 |
97 pages |
| Authors:
Jeremiah J Cheatum; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF MECHANICAL ENGINEERING
|
| Semiconductors continue to shrink in size and are now nearing the performance limits of some traditional materials. Silicon Dioxide, which has been used extensively as a gate insulator in MOSFETs, is one such material and so research is focusing on finding a suitable replacement with a high dielectric constant. Oxides of Lanthanum and Zirconium have been identified as possible successors, but these compounds have not been well studied. This thesis ... |
|
| Pulse Mode Light Sensing Using Four-Layer Semiconductor Structures and Their Application in Neural Networks |
Dec-2008 |
91 pages |
| Authors:
Ioannis Siganos; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Existing semiconductor photodetectors produce a steady current or voltage output in response to incident light that depends on the intensity of the light beam. In contrast, biological vision systems produce a stream of pulses with pulse rate representing the amount of incident light power. The goal of this thesis is to explore the use of a four-layer PNPN semiconductor structure as an optical detector that produces pulses instead of steady ... |
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| Efficient Implementation of Filtering and Resampling Operations on Field Programmable Gate Arrays (FPGAs) for Software Defined Radio (SDR) |
Dec-2008 |
79 pages |
| Authors:
Georgios Giannoulis; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| In Software Defined Radios a good portion (or even the entirety) of the modulation and demodulation processes is performed in the digital domain. The data rate of the transmitted information is very important, since efficiency is a key requirement in real time implementations and cost increases considerably with the number of samples per second to be processed. In this thesis, we address the problem of efficient design of the resampling ... |
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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
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| 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
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| 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
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| 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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Electrical and Electronic Equipment
