| Ultrasonic Phased Arrays for the Inspection of Thick-Section Welds |
Sep-2009 |
13 pages |
| Authors:
R J Ditchburn; M E Ibrahim; DEFENSE SCIENCE AND TECHNOLOGY ORGANIZATION VICTORIA (AUSTRALIA) MARITIME PLATFORMS DIV
|
 | Ultrasonic phased arrays will eventually replace conventional ultrasonic methods in many nondestructive evaluation (NDE) applications. However, the transition to phased arrays is not without its pitfalls and challenges. In this report we present a summary of the advantages and limitations of phased-array ultrasonics in NDE, with specific reference to the inspection of thick-section welds. The main advantages offered by phased arrays over conventional systems are increased sensitivity, coverage and speed. ... |
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| PSK Shift Timing Information Detection Using Image Processing and a Matched Filter |
Sep-2009 |
152 pages |
| Authors:
Joseph E Kramer; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis investigates the detection of phase shifts contained within a noisy Phase Shift Keyed modulated signal. The approach derived in this work applies image-processing techniques including two-dimensional filters, edge detection, morphological processing, and a two-dimensional cross-correlation matched filter to detect the phase shifts from the angle of the signal temporal correlation function. Results show the proposed algorithm is robust to additive white noise distortions down to SNR levels of ... |
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| Robust Adaptive Control Using a Filtering Action |
Sep-2009 |
120 pages |
| Authors:
Jia-Horng Yang; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This dissertation describes the design of an adaptive controller for single-input single-output (SISO) systems with guaranteed bounds on the transient response, and robustness with external disturbances and unmodeled dynamics. Developed from a current approach called L1 adaptive controller, we show that by adding two properly designed low pass filters at the input and at the estimator we can control the transient response and the sensitivity of the overall system to ... |
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| A Contrasting Look at Network Formation Models and Their Application to the Minimum Spanning Tree |
Sep-2009 |
66 pages |
| Authors:
Deanne B McPherson; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Networks are prevalent in man-made and natural systems throughout the world. Despite recent efforts to characterize and catalog networks of all kinds, there is considerably less known about the forces that drive network formation. For many complex systems, it is unclear whether networks are the result of an explicit effort to achieve some overarching global system objective, or if network structure is just a byproduct of local, selfish decisions. In ... |
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| Development of the Phase Synchronization Circuit for Wirelessly Distributed Digital Phased Array |
Sep-2009 |
129 pages |
| Authors:
Yen-Chang Tsai; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The Wirelessly Distributed Digital Phased Array (WDDPA) is an ongoing research program at the Naval Postgraduate School (NPS) which has numerous possible applications in radar and communication systems. The WDDPA incorporates many array elements randomly or nonuniformly in the environment or on a platform. Array elements are synchronized and controlled over a wireless channel. Compared to conventional phased array systems, its advantages are adaptability, survivability and flexibility. Phase synchronization is ... |
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| NPS-SCAT: Electrical Power System |
Sep-2009 |
103 pages |
| Authors:
Dorn; Lawrence T Jr; NAVAL POSTGRADUATE SCHOOL MONTEREY CA SPACE SYSTEMS ACADEMIC GROUP
|
| The Naval Postgraduate School Solar Cell Array Tester (NPS-SCAT) seeks to expand the CubeSat knowledge base and provide learning possibilities at the Naval Postgraduate School. This thesis discusses the design, testing, and integration of the electrical power sub-system for NPS-SCAT. The current design will be powered by a commercial-off-the-shelf power system developed by Clyde Space systems. Solar power generation will be via Spectrolab's improved triple junction solar cells. Satellite Tool ... |
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| Implementation of Phased Array Antenna Technology Providing a Wireless Local Area Network to Enhance Port Security and Maritime Interdiction Operations |
Sep-2009 |
101 pages |
| Authors:
Andrew P Rivas; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis will focus on field testing to evaluate the feasibility of employing electronically steered (phased array) antennas to provide a ship-to-shore wireless network connection (802.11g) for littoral maritime assets. Specific areas being examined include the evaluation of voice, video, and other data transmitted from a maritime interdiction team, in real time, to a remote command and control center in support of a Visit Board Search and Seizure (VBSS) and ... |
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| Designing a Sensorless Torque Estimator for Direct Torque Control of an Induction Motor |
Sep-2009 |
87 pages |
| Authors:
Athanasios Tsoutsas; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Nowadays, transportation is a major cause of air pollution. Electric propulsion could replace the internal combustion engines of automobiles and reduce the emission of exhaust gases. The propulsion of an electric vehicle requires the design of an accurate electromagnetic torque estimator and an efficient control system in order to control the speed of the vehicle. This concept is conveyed through this thesis. An electromagnetic torque calculator of an induction motor ... |
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| Energy Harvesting for Self-Powered, Ultra-Low Power Microsystems With a Focus on Vibration-Based Electromechanical Conversion |
Sep-2009 |
80 pages |
| Authors:
Sean M Forester; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Wireless distributed microsensor systems offer reliable monitoring and control of a myriad of applications ranging from machine state and perimeter security to nuclear/chemical/biological and other military applications. Historically, batteries have supplied power to mobile, embedded, and ultra-low power microsensors. While there are many obvious short-term advantages of using batteries, they do have a long-term negative environmental impact. An alternative to batteries exists in harnessing the ambient energy surrounding the system ... |
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| Telecommunications Growth in Latin America: A Comparative Analysis, the Development and Policy of Technologies in Emerging Markets |
Sep-2009 |
156 pages |
| Authors:
Westley N Simancas; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF INFORMATION SCIENCES
|
| This thesis will focus on the area of telecommunications technologies and its policies as developed and adopted in Latin America. Though the whole of Latin America would provide a great area of research interest, this thesis will delve into the countries of Colombia, Mexico, and Venezuela. These three countries play vital roles in the development of Latin America and retain unique relationships with the United States as allies and trade ... |
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| Investigation into Contact Resistance And Damage of Metal Contacts Used in RF-MEMS Switches |
Sep-2009 |
578 pages |
| Authors:
Kevin W Gilbert; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| This research examines the physical and electrical processes involved in lifecycle failure of Microelectromechanical (MEMS) Radio-Frequency (RF) cantilever beam ohmic contact switches. Failures of these switches generally occur at the contact, but complete details of performance of microcontacts are difficult to measure and have not been previously reported. This study investigated the mechanics of microcontact behavior by designing and constructing a novel experimental setup. Three representative contact materials of varying ... |
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| Real-Time Computing on Multicore Platforms |
Sep 2009 |
5 pages |
| Authors:
James H Anderson; NORTH CAROLINA UNIV AT CHAPEL HILL
|
| The objective of this project is to develop real-time scheduling and synchronization algorithms that are well-suited for multicore platforms and to implement these algorithms within a real as. Towards this objective, new multiprocessor real-time scheduling algorithms have been developed that are optimized to deal with specific cache layouts and performance asymmetries. |
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| An Ultra Low Power 180-Degree, 1-Bit Phase Shifter using MOSFETS |
Sep 2009 |
13 pages |
| Authors:
Bruce Offord; C Milligan; H Jazo; J Meloling; SPACE AND NAVAL WARFARE SYSTEMS CENTER SAN DIEGO CA
|
| An ultra low power 180-degree, 1-bit phase shifter has been designed using Agilent's Advanced Design Software (ADS) co-simulation. Silicon-on-Insulator (SOI). MOSFETs were used as the switching elements because of their low current draw and low capacitance. A 1-bit 0, 180-degree phase shift has been realized with only two MOSFETs, simplifying manufacture and decreasing power. |
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| Galvanic Corrosion in Silicon Microsystems: Finite Element Simulation Tool Development |
28 Aug 2009 |
7 pages |
| Authors:
Conrad R Stoldt; COLORADO UNIV AT BOULDER OFFICE OF CONTRACTS AND GRANTS
|
| Many microsystems fabrication technologies currently employ a metallic overlayer, such as gold, in electrical contact with silicon (Si) structural layers. During postprocessing in hydrofluoric acid based solutions, a galvanic cell is created between the silicon and the metallic layer. As a consequence, autonomous corrosion (etching) of the silicon layer occurs forming nanoscale porosity at the thin film surface and grain boundaries. Over the past 24 months, our ARO sponsored work ... |
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| High-Resolution, Large-Area, Nano Imprint Lithography |
27 Aug 2009 |
52 pages |
| Authors:
Moonho Jo; Sooyoung Park; Younghee Lee; Kimbum Kim; SEOUL NATIONAL UNIV SEOUL (KOREA SOUTH) SCHOOL OF MATERIALS SCIENCE
|
| This document contains results from four different basic research projects under the Phase I of US-Korea NBIT Program (2007-2010). It is the 2nd year results covering research results from 2008-2009. It begins with the fourth report, High-resolution, Large-Area, Nano Imprint Lithography Using Electron Lattice Images and Electron-emitting Nanoprobes by US primary investigator, Prof. Sungho Jin, UC San Diego, and the Korean primary investigator, Ki-Bum Kim, Seoul National University. It is ... |
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| Energy Decay in Superconducting Josephson-Junction Qubits from Nonequilibrium Quasiparticle Excitations |
26-Aug-2009 |
5 pages |
| Authors:
John M Martinis; M Ansmann; J Aumentado; CALIFORNIA UNIV SANTA BARBARA
|
| We calculate the energy decay rate of Josephson qubits and superconducting resonators from nonequilibrium quasiparticles. The decay rates from experiments are shown to be consistent with predictions based on a prior measurement of the quasiparticle density nqp 10=micrometers3, which suggests that nonequilibrium quasiparticles are an important decoherence source for Josephson qubits. Calculations of the energy-decay and diffusion of quasiparticles also indicate that prior engineered gap and trap structures, which reduce ... |
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| Transition in Gas Turbine Engine Control System Architecture: Modular, Distributed, Embedded |
Aug-2009 |
79 pages |
| Authors:
Al Behbahani; Dennis Culley; Bill Mailander; Dewey Benson; Bruce Wood; Derek Weber; Bill Rhoden; Gary Hunter; Casey Carter; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIRECTORATE
|
| Presentations from the Distributed Engine Control Working Group included: Vision and need for future turbine engine control; Implementation and technology challenges; High temperature electronics; Innovation and entry barriers. |
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| Nanoelectronics of Carbon Nanotube Multi-Terminal Junctions |
27-Jul-2009 |
9 pages |
| Authors:
Madhu Menon; KENTUCKY UNIV LEXINGTON CENTER FOR COMPUTATIONAL SCIENCES
|
| Using the support we have developed and used a novel method to investigate molecular electronic device applications of carbon nanotube multi-terminal junctions in the form of T- and Y-junctions. The theoretical methods included (i) large scale simulations using accurate quantum tight-binding molecular dynamics scheme and (ii) quantum conductivity formalisms. Both methods were developed by the PI's group. All the structures investigated were fully relaxed using quantum tight-binding molecular dynamics methods ... |
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| Genetic Modeling of Battery Performance |
10 Jul 2009 |
|
| Authors:
Albert H Zimmerman; AEROSPACE CORP EL SEGUNDO CA
|
 | A state-of-the-art, first-principles lithium-ion cell model has been used to describe the changes in the performance of a 50- Ah cell during the first 7563 cycles of its life. This model was fit to the life test database using a genetic adaptation algorithm that provided degradation trends for nine different parameters that described the processes most likely to undergo change during the life of the cell. Based on the model ... |
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| Increased Ground Vibration Measurement Speed for Landmine Detection |
09 Jul 2009 |
95 pages |
| Authors:
James M Sabatier; MISSISSIPPI UNIV UNIVERSITY NATIONAL CENTER FOR PHYSICAL ACOUSTICS
|
| The objective of this program, to demonstrate the feasibility of time-division multiplexing for rapid ground vibration measurements, has been achieved. Time-division multiplexing is a technique in which a multiple-beam laser Doppler vibrometer (MBLDV) passes over the ground while each beam measures a portion of the ground vibration. The signal from each beam is combined to determine the vibration pattern of that section of ground. In this way, the ground vibration ... |
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| Frontiers of Engineering: Reports on Leading-Edge Engineering from the 2008 Symposium |
07 Jul 2009 |
172 pages |
| Authors:
Charles L Beames; Ann M Bisantz; Ronald L Boring; Xiaohu Gao; Stephanie Guerlain; Jeff Hrkach; Ali Javey; John D Lee; Joseph C Martz; Samir Mitragotri; Steven D Nixon; Mihrimah Ozkan; Daniel W Pack; Romig; A D Jr; Jeffrey J Welser; Nikolai Zhitenev; NATIONAL ACADEMY OF ENGINEERING WASHINGTON DC
|
| This volume includes 16 papers from the National Academy of Engineering's 2008 U.S. Frontiers of Engineering (USFOE) Symposium. USFOE meetings bring together 100 outstanding engineers (ages 30-45) to exchange information about leading-edge technologies in a range of engineering fields. The 2008 symposium covered four topic areas: drug delivery systems. emerging nanoelectronic devices, cognitive engineering, and countering the proliferation of weapons of mass destruction. The papers focus on cutting-edge developments. |
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| Quantum Enhanced Imaging by Entangled States |
Jul-2009 |
123 pages |
| Authors:
Doyle Nichols; NORTHROP GRUMMAN SYSTEMS CORP LINTHICUM HEIGHTS MD
|
| The use of entangled states in a prospective standoff imaging sensor has been explored. Specifically, the question of whether enhanced performance (in terms of achievable resolution, in particular) may be obtained through the use of entangled states in a ghost imaging configuration has been investigated. The resiliency of such a system in the presence of transmission impairments that necessarily accompany sensors in a tactical environment, such as large optical loss, ... |
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| Simulation Concept - How to Exploit Tools for Computing Hybrids |
Jul-2009 |
53 pages |
| Authors:
Clare D Thiem; Joseph M Hertline; AIR FORCE RESEARCH LAB ROME NY INFORMATION DIRECTORATE
|
| The Simulation Concept - How to Exploit Tools for Computing Hybrids (SCHETCH) project is exploring the design modeling and simulation (M&S) process for developing advanced computing technology for future intelligent systems. The desire is to integrate new alternative computing concepts with existing silicon-based computing technology in hybrid computing architectures. This interim report documents what progress has been made during the first two years of the effort. Literature reviews, past modeling ... |
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| Effects of Differing Carbon Nanotube Field-effect Transistor Architectures |
Jul-2009 |
22 pages |
| Authors:
Andrew M Dorsey; Matthew H Ervin; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| Single-walled carbon nanotube field-effect transistors (SWCNTFETs) were fabricated with varying device architectures. Variations on the standard back-gated architecture included varying the gate oxide material and thickness, changing source and drain contact metallization, suspending the carbon nanotubes to minimize interaction with the gate oxide, and fabricating a topgated architecture employing a thin layer of aluminum oxide (Al2O3) as the gate oxide. Devices were characterized and compared to each other based on ... |
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| Giselle: A Mutually Orthogonal Triple Twin-loop Ground-symmetrical Broadband Receiving Antenna for the HF Band |
Jul-2009 |
95 pages |
| Authors:
W Martinsen; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) COMMAND CONTROL COMMUNICATIONS AND INTELLIGENCE DIV
|
| This report describes development of a tri-axial mutually orthogonal broadband twin-loop receiving antenna for the HF band. The three twin-loops have been arranged so that they exhibit the same distributed parameters between themselves and ground. The upper frequency limit of the antenna is discussed and a method for extending the low frequency cut-off is presented. The antenna noise factor is calculated from measured data. |
|
| UXO Detection and Characterization in the Marine Environment |
Jul 2009 |
71 pages |
| Authors:
Jim McDonald; SCIENCE APPLICATIONS INTERNATIONAL CORP (SAIC) CARY NC
|
| Beginning in 2003 SAIC (formerly AETC) developed the Marine Towed Array for underwater geophysical investigations. The underwater towed platform is a 5 meter wide array containing 8 Cesium vapor magnetomers. It is towed by a 60 foot cable by a pontoon boat. The attitude and depth of the sensor platform is controlled by an autopilot. The inputs to the autopilot include a tactical grade IMU, depth sensors and digital magnetic ... |
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| Semiconductor Terahertz Technology |
15-Jun-2009 |
19 pages |
| Authors:
Gregory Sun; MASSACHUSETTS UNIV BOSTON
|
| During this contract, we have investigated the THz laser source based on group-IV elements and their alloys that can be developed on Si substrates. The design work focused on the structure of the so-called quantum cascade laser (QCL). Specifically, we designed a Ge/Ge0.076Si0.19Sn0.05 QCL using intersubband transitions at L-valleys of the conduction band which has a clean offset of 150meV situated below other energy valleys (Gamma, Chi). The entire structure ... |
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| Electrical and Thermal Analysis of Gallium Nitride HEMTs |
01-Jun-2009 |
109 pages |
| Authors:
Yuchia Wang; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The purpose of this thesis was to build a transient model and to study the electrical and thermal characteristics of the AlGaN/GaN HEMT. We first used Method 3104 of MIL-STD 750D to determine the location of HEMT structure that gate voltage measurement relates to. Secondly, we investigated the performance of single pulse and multiple pulses. Thirdly, we studied and compared the performance between the DC model and the Transient model ... |
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| Characterization of MEMS a Directional Microphone with Solid and Perforated Wings |
01-Jun-2009 |
57 pages |
| Authors:
Norbahrin Muamad; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This goal of this research is to characterize two microelectromechanical system (MEMS) based directional sound sensors with solid and perforated wings. The design of the sensors was based on the structure of Ormia ochracea fly's hearing system that has highly directional hearing through mechanical coupling of the eardrums. The sensors are made of 10 micron thick single crystal silicon layer with dimensions 1 x 2 mm2. The sensors were fabricated ... |
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| Experimental Analysis of Perspective Elongation Effects Using a Laser Guide Star in an Adaptive-Optics System (POSTPRINT) |
01 Jun 2009 |
14 pages |
| Authors:
Kevin P Vitayaudom; Darryl J Sanchez; Denis W Oesch; Patrick R Kelly; Carolyn M Tewksbury-Christle; Julie C Smith; AIR FORCE RESEARCH LAB KIRTLAND AFB NM DIRECTED ENERGY DIRECTORATE
|
| The use of a laser guidestar (LGS) for the purpose of a beacon in an adaptive-optics (AO) system is prone to perspective elongation effects on the spots of a Shack-Hartmann wavefront sensor. The elongated spots can vary in size over the subapertures and affect the gradient sensitivity of the sensor. The Air Force Research Laboratory (AFRL) has developed a LGS model that outputs gradient gains which represent the effects of ... |
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| 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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| Investigating the Electrothermal Characteristics of a Gate Turn Off Thyristor During Turn-Off Using SILVACO ATLAS(TM) |
Jun-2009 |
149 pages |
| Authors:
Gerald E Vineyard; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis presents data from a simulation study of the thermal and electrical characteristics of a Gate Turn Off (GTO) thyristor. At present, most of the research on GTO thyristors has focused on their use in power electronic systems at high switching frequencies. As a result, the behavior of GTO thyristors at very low switching frequencies is not well understood. Previous research projects have shown experimentally that GTO thyristors are ... |
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| Transport Imaging: Developing an Optical Technique to Characterize Bulk Semiconductor Materials for Next Generation Radiation Detectors |
Jun-2009 |
79 pages |
| Authors:
Sarah L Catalano; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Characterization of the mobility-lifetime product is critical to the development of new materials for semiconductor radiation detectors. An optical technique has been developed that allows for the direct determination of the minority carrier diffusion length, drift length, and mobility-lifetime product from a single image of the recombination luminescence in semiconductor materials. Excess carriers are generated using the electron beam in a scanning electron microscope. The charge is then drifted by ... |
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| System Identification of an on Orbit Spacecraft's Antenna Dynamics |
Jun-2009 |
97 pages |
| Authors:
Christopher M Sylvester; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| The research presented here is a follow on to previous efforts [Pachter, Barba, 2007] in which a tight control loop was designed to meet performance specifications while minimizing the control gains of a spacecraft mounted flexible antenna. Emphasis is now shifted to system identification in order to increase nominal plant knowledge, estimate plant uncertainty bounds, as well as determine the disturbance band. Knowledge of the plant dynamics along with the ... |
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| Atomic Layer Deposition Enabled Interconnect Technology for Vertical Nanowire Arrays |
Jun 2009 |
26 pages |
| Authors:
Jen-Hau Cheng; Dragos Seghete; Myongjai Lee; John B Schlager; Kris A Bertness; Norman A Sanford; Ronggui Yang; Steven M George; Y C Lee; COLORADO UNIV AT BOULDER DEPT OF MECHANICAL ENGINEERING
|
| We have demonstrated an atomic layer deposition (ALD) enabled interconnect technology for vertical, c-axis oriented gallium nitride (GaN) nanowire (NW, 5-10 um in length, 80-200 nm in diameter) arrays encapsulated by Benzocyclobutene (BCB). The nano-scaled ALD multilayer is essential to provide conformal co-axial dielectric (ALDalumina)/ conductor (ALD-tungsten) coverage and precise thickness control for nanowire metallization. Furthermore, we have successfully developed a fabrication process to locally remove and connect tungsten (W) ... |
|
| Nonlinearities and Wave Mixing Properties of Negative Index Materials (Nanotechnology Initiative) |
31-May-2009 |
4 pages |
| Authors:
Aref Chowdhury; LUCENT TECHNOLOGIES INC MURRAY HILL NJ
|
| The primary goal of this project was to develop new ideas in the area of nonlinearities in negative refractive index media, with particular focus on the optical regime as this is a regime that exhibits strong nonlinearities. As metamaterials are composed of sub-wavelength unit cells by their very nature, metamaterials in the optical regime are nanostructures. Thus, the research directly addressed novel nonlinear effects in nanostructured negative index metamaterials. The ... |
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| Microchannel Heat Sink with Micro Encapsulated Phase Change Material (MEPCM) Slurry |
31-May-2009 |
83 pages |
| Authors:
Louis Chow; Jian-hua Du; Amit Gupta; Krishna Kota; Ranganathan Kumar; Sarada Kuravi; UNIVERSITY OF CENTRAL FLORIDA ORLANDO OFFICE OF RESEARCH AND COMMERCIALIZATION
|
| High heat flux removal from devices such as Insulated-Gate Bipolar Transistor (IGBT) and Monolithic Microwave Integrated Circuit (MMIC) will be important for future Navy ships. Micro encapsulated phase change material (MEPCM) slurry was used as a heat transfer fluid inside a microchannel instead single phase fluid. Presence of phase change material increases the effective heat capacity of the fluid. The performance of encapsulated phase change material (EPCM) slurry flow in ... |
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| Emergence of Dissipative Structures in Current-Carrying Superconducting Wires (Postprint) |
26-May-2009 |
13 pages |
| Authors:
G A Levin; P N Barnes; J S Bulmer; J P Rodriguez; J A Connors; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIRECTORATE
|
| We discuss the emergence of a spontaneous temperature and critical current spatial modulation in current-carrying high-temperature superconducting wire. The modulation of the critical current along the wire on a scale of 3-10 mm forces a fraction of the transport current to crisscross the resistive interface between the superconducting film and normal metal stabilizer attached to it. This generates additional heat that allows such structure to be self-sustainable. Stability and the ... |
|
| 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. |
|
| Study of Spin Splitting in GaN/AlGaN Quantum Wells |
11-May-2009 |
6 pages |
| Authors:
Ikai Lo; Jih-Chen Chiang; NATIONAL SUN YAT-SEN UNIV KAOHSIUNG (TAIWAN) DEPT OF PHYSICS
|
| In the past year, the electronic properties of device-quality InGaN/GaN and AlGaN/GaN quantum wells were investigated by optical and transport measurements. Spin splitting of two-dimensional electron gas in GaN/AlxGa1-xN heterostructures were studied in detail. The result of the investigation can be separated into two parts. One is the study of HEMT made of AlGaN/GaN heterostructures, from the sample growth (by MBE) to the device process (by FIB), to investigate the ... |
|
| 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. |
|
| 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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| Defense Industrial Base Assessment: U.S. Integrated Circuit Design and Fabrication Capability |
May-2009 |
255 pages |
| Authors:
Christopher Nelson; Mark Crawford; Teresa Telesco; Brad Botwin; DEPARTMENT OF COMMERCE WASHINGTON DC BUREAU OF INDUSTRY AND SECURITY
|
| The capability to design and fabricate integrated circuit (IC) products is critical to the economic and national security of the United States. IC products are fundamental building blocks for commercial, industrial, and national security electronic systems. In recent years, there have been questions about the possible erosion of the U.S. manufacturing base and increasing reliance on offshore producers to supply microprocessors, memory chips, and other IC devices. In July 2007, ... |
|
| The National Nanotechnology Initiative: Research and Development Leading to a Revolution in Technology and Industry. Supplement to the President's FY 2010 Budget |
May-2009 |
43 pages |
| Authors:
NATIONAL SCIENCE AND TECHNOLOGY COUNCIL WASHINGTON DC NANOSCALE SCALE ENGINEERING AND TECH SUBCOMMITTEE
|
| This document provides supplemental information to the President's 2010 Budget and serves as the Annual Report on the NNI called for in the 21st Century Nanotechnology Research and Development Act (P.L. 108-153). In particular, the report summarizes NNI programmatic activities for 2008 and 2009, as well as those planned for in 2010. NNI budgets for 2008-2010 are presented by agency and PCA in Section 2 of this report. Information on ... |
|
| Innovation in Engineering Outreach: Engineering 11 as a Tool for Recruiting Minority Students to Engineering |
30-Apr-2009 |
11 pages |
| Authors:
Jeigh Shelly; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| A unique opportunity for recruiting engineering students has developed in the Antelope Valley of Southern California (AV). While the AV refers to itself as the Aerospace Valley, with a high percentage of the workforce employed by Edwards Air Force Base and the major Aerospace Prime Contractors, it has had no local baccalaureate degree granting institution to support these high-tech industries. A State University College of Engineering has partnered with the ... |
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| Atomic Spectral-Product Representations of Molecular Electronic Structure: Metric Matrices and the Spectral Compositions of Molecular Eigenfunctions (Postprint) |
30-Apr-2009 |
12 pages |
| Authors:
M Ben-Nun; J D Mills; R J Hinde; C L Winstead; J A Boatz; G A Gallup; P W Langhoff; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| Recent progress is reported in development of ab initio computational methods for the electronic structures of molecules employing atomic spectral-product representations. In this approach, the physically significant many-electron eigenstates of constituent atoms provide a computational basis for descriptions of the electronic structure of matter as an alternative to more commonly employed atomic- or molecular-orbital-based representations. Particular attention is focused in the present report on properties of the metric matrix and ... |
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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
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| 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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| Development of Two-Axial Bow-Tie Atom Trap with Near-Field Light |
28-Apr-2009 |
8 pages |
| Authors:
Ito Haruhiko; TOKYO INST OF TECH (JAPAN) DEPT OF PHYSICS
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| We developed a cross-shaped structure with a multilayer film for the 3D atom trap. The spatial profile of near-field light produced in the center gap was obtained from the finite difference time domain simulations, and the trap potential for a single Rb atom was also calculated. Based on the results, we determined the angle of slope, the radius of curvature of edges in the center, the thickness of each layer, ... |
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| Doping Asymmetry Problem in ZnO: Current Status and Outlook. A Review of Experimental and Theoretical Efforts Focused on Achieving P-Type ZnO Suitable for Light-Emitting Optoelectronic Devices for the Blue/Ultraviolet Spectral Range |
24-Apr-2009 |
12 pages |
| Authors:
Hadis Morkoc; Vitaliy Avrutin; Donald Silversmith; VIRGINIA COMMONWEALTH UNIV RICHMOND
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| ZnO has gained considerable interest recently as a promising material for a variety of applications. To a large extent, the renewed interest in ZnO is fueled by its wide direct band gap (3.3 eV at room temperature) and large exciton binding energy (60 meV) making this material, when alloyed with e.g. Cd and Mg, especially attractive for light emitters in the blue/UV spectral region. Unfortunately, as with other wide-gap semiconductors, ... |
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Electrical and Electronic Equipment
