24 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Circuits"  
Results: 1 - 24
open access

Low-cost inertial measurement unit.

Description: Sandia National Laboratories performs many expensive tests using inertial measurement units (IMUs)--systems that use accelerometers, gyroscopes, and other sensors to measure flight dynamics in three dimensions. For the purpose of this report, the metrics used to evaluate an IMU are cost, size, performance, resolution, upgradeability and testing. The cost of a precision IMU is very high and can cost hundreds of thousands of dollars. Thus the goals and results of this project are as follows: (1) … more
Date: March 1, 2005
Creator: Deyle, Travis Jay
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Robust hermetic packaging techniques for MEMS integrated microsystems.

Description: This work is the result of a Sandia National Laboratories LDRD funded fellowship at the University of Michigan. Although, guidance and suggestions were offered by Sandia, the work contained here is primarily the work of Brian H. Stark, and his advisor, Professor Khalil Najafi. Junseok Chae, Andrew Kuo, and their coworkers at the University of Michigan helped to record some of the data. The following is an abstract of their work. We have developed a vacuum packaging technology using a thick nick… more
Date: March 1, 2005
Creator: Chae, Junseok (University of Michigan); Stark, Brian H. (University of Michigan); Kuo, Andrew (University of Michigan); Oliver, Andrew David & Najafi, Khalil (University of Michigan)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Final Report Providing the Design for Low-Cost Wireless Current Transducer and Electric Power Sensor Prototype

Description: This report describes the design and development of a wireless current transducer and electric power sensor prototype. The report includes annotated schematics of the power sensor circuitry and the printed circuit board. The application program used to illustrate the functionality of the wireless sensors is described in this document as well.
Date: January 31, 2005
Creator: Kintner-Meyer, Michael CW; Burghard, Brion J. & Reid, Larry D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Engineering and Physics Optimization of Breed and Burn Fast Reactor Systems: Annual and Final Report

Description: The Idaho National Laboratory (INL) contribution to the Nuclear Energy Research Initiative (NERI) project number 2002-005 was divided into reactor physics, and thermal-hydraulics and plant design. The research targeted credible physics and thermal-hydraulics models for a gas-cooled fast reactor, analyzing various fuel and in-core fuel cycle options to achieve a true breed and burn core, and performing a design basis Loss of Coolant Accident (LOCA) analysis on that design. For the physics analys… more
Date: October 1, 2005
Creator: Weaver, Kevan D.; Marshall, Theron & Parry, James
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Hybrid FDTD Analysis for Periodic On-Chip Terahertz (THZ) Structures

Description: We present electromagnetic analysis and radiation efficiency calculations for on-chip terahertz (THz) structures based on a hybrid, finite-difference, time-domain (HFDTD) technique. The method employs the FDTD technique to calculate S-parameters for one cell of a periodic structure. The transmission ABCD matrix is then estimated and multiplied by itself n times to obtain the n-cell periodic structure ABCD parameters that are then converted back to S-parameters. Validation of the method is carri… more
Date: June 7, 2005
Creator: Hussein, Yasser A. & Spencer, James E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

System Dynamics and Control System for a High Bandwidth Rotary Actuator and Fast Tool Servo

Description: This paper explores some of the system dynamics and control issues for a short-stroke rotary actuator that we designed and tested for a new fast tool servo referred to as the 10 kHz rotary fast tool servo. The use of a fast tool servo (FTS) with a diamond turning machine for producing non-axisymmetric or textured surfaces on a workpiece is well known. In a previous paper [1] the authors provide details on the mechanical design and trade-off issues that were considered during the design phase fo… more
Date: August 5, 2005
Creator: Montesanti, R C & Trumper, D L
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Large Scale Nanolaminate Deformable Mirror

Description: This work concerns the development of a technology that uses Nanolaminate foils to form light-weight, deformable mirrors that are scalable over a wide range of mirror sizes. While MEMS-based deformable mirrors and spatial light modulators have considerably reduced the cost and increased the capabilities of adaptive optic systems, there has not been a way to utilize the advantages of lithography and batch-fabrication to produce large-scale deformable mirrors. This technology is made scalable by … more
Date: November 30, 2005
Creator: Papavasiliou, A.; Olivier, S.; Barbee, T.; Miles, R. & Chang, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

3D Active photonic crystal devices for integrated photonics and silicon photonics.

Description: Over the past 15 years, basic photonic crystals operating in optical wavelengths have been theoretically investigated and experimentally realized. New directions must now be set to understand fundamental photon-matter interactions and thus realize active photonic components for integrated and silicon-based photonic applications. This proposal aims at two key areas to study. They are: (1) Thermal emission and silicon photonic crystal lasers--an aspect of photon-phonon interaction. (2) Optical in… more
Date: November 1, 2005
Creator: Clem, Paul Gilbert; Chow, Weng Wah; Subramania,Ganapathi Subramanian; Fleming, James Grant; Wendt, Joel Robert & El-Kady, Ihab Fathy
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Radiative Characteristics of On-Chip Terahertz (THz) Structures

Description: Previously, we explored possibilities for producing narrow-band THz radiation using either free or bound electrons (solid state) in micro-undulatory configurations [1] because integrated circuit technology appeared well matched to this region extending from about 300 GHz to 30 THz. This range [2]-[3] has largely been neglected until recently because it runs from the limit of WR-3 waveguide around 300 GHz up to CO{sub 2} lasers where the laser regime becomes dominant. There are mainly two approa… more
Date: June 7, 2005
Creator: Hussein, Yasser A. & Spencer, James E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Fundamental Studies of Fluid Mechanics: Stability in Porous Media

Description: This work has been concerned with theoretical, computational and experimental studies of a variety of flow and transport problems that are of generic interest and applicability in energy-related and energy-intensive processes. These include the following. (1) Problems associated with oil recovery: the global economy continues to be dependent on the stable and predictable supply of oil and fossil fuels. This will remain the case for the near term, as current estimates are that world production o… more
Date: April 28, 2005
Creator: Homsy, George M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Chemistry, Detection, and Control of Metals during Silicon Processing

Description: This dissertation focuses on the chemistry, detection, and control of metals and metal contaminants during manufacturing of integrated circuits (ICs) on silicon wafers. Chapter 1 begins with an overview of IC manufacturing, including discussion of the common aqueous cleaning solutions, metallization processes, and analytical techniques that will be investigated in subsequent chapters. Chapter 2 covers initial investigations into the chemistry of the SC2 clean - a mixture of HCl, H2O2, and DI wa… more
Date: May 2005
Creator: Hurd, Trace Q.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Gain dispersion in Visible Light Photon Counters as a function of counting rate

Description: We present measurements of light signals using Visible Light Photon Counters (VLPC), that indicate an increase in gain dispersion as the counting rate increases. We show that this dispersion can be understood on the basis of a recent observation of localized field reduction in VLPCs at high input rates.
Date: March 1, 2005
Creator: Bross, A.; Buscher, V.; Estrada, J.; Ginther, G. & Molina, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Test results for the SVX4 version of A/B chip

Description: We present and summarize the test results for the SVX4 version A/B chip. After all tests, we are confident that the SVX4 version A/B chip satisfies all requirements for full production.
Date: June 1, 2005
Creator: Christofek, L.; Hanagaki, K.; Jun, M.; Kau, D.; Rapidis, P. & Utes, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Efficient Modeling of PIN Diode Switches Employing Time-Domain Electromagnetic-Physics-Based Simulators

Description: This paper presents an efficient full-wave time-domain simulator for accurate modeling of PIN diode switches. An equivalent circuit of the PIN diode is extracted under different bias conditions using a drift-diffusion physical model. Net recombination is modeled using a Shockley-Read-Hall process, while generation is assumed to be dominated by impact ionization. The device physics is coupled to Maxwell's equations using extended-FDTD formulism. A complete set of results is presented for the on … more
Date: September 20, 2005
Creator: Hussein, Y. A.; Spencer, J. E.; El-Ghazaly, S. M. & Goodnick, S. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Pixel multi chip module development at Fermilab

Description: At Fermilab, there is an ongoing pixel detector R&D effort for High Energy Physics with the objective of developing high performance vertex detectors suitable for the next generation of HEP experiments. The pixel module presented here is a direct result of work undertaken for the canceled BTeV experiment. It is a very mature piece of hardware, having many characteristics of high performance, low mass and radiation hardness driven by the requirements of the BTeV experiment. The detector pres… more
Date: October 1, 2005
Creator: Turqueti, M. A.; Cardoso, G.; Andresen, J.; Appel, J. A.; Christian, D. C.; Kwan, S. W. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Small circuits for cryptography.

Description: This report examines a number of hardware circuit design issues associated with implementing certain functions in FPGA and ASIC technologies. Here we show circuit designs for AES and SHA-1 that have an extremely small hardware footprint, yet show reasonably good performance characteristics as compared to the state of the art designs found in the literature. Our AES performance numbers are fueled by an optimized composite field S-box design for the Stratix chipset. Our SHA-1 designs use register… more
Date: October 1, 2005
Creator: Torgerson, Mark Dolan; Draelos, Timothy John; Schroeppel, Richard Crabtree; Miller, Russell D. & Anderson, William Erik
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mitotic Exit Control as an Evolved Complex System

Description: The exit from mitosis is the last critical decision a cell has to make during a division cycle. A complex regulatory system has evolved to evaluate the success of mitotic events and control this decision. Whereas outstanding genetic work in yeast has led to rapid discovery of a large number of interacting genes involved in the control of mitotic exit, it has also become increasingly difficult to comprehend the logic and mechanistic features embedded in the complex molecular network. Our view is… more
Date: April 25, 2005
Creator: Bosl, W & Li, R
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Final Progress Report: FRACTURE AND SUBCRITICAL DEBONDING IN THIN LAYERED STRUCTURES: EXPERIMENTS AND MULTI-SCALE MODELING

Description: Final technical report detailing unique experimental and multi-scale computational modeling capabilities developed to study fracture and subcritical cracking in thin-film structures. Our program to date at Stanford has studied the mechanisms of fracture and fatigue crack-growth in structural ceramics at high temperature, bulk and thin-film glasses in selected moist environments where we demonstrated the presence of a true mechanical fatigue effect in some glass compositions. We also reported on… more
Date: August 30, 2005
Creator: Dauskardt, Reinhold H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

DCal: A custom integrated circuit for calorimetry at the International Linear Collider

Description: A research and development collaboration has been started with the goal of producing a prototype hadron calorimeter section for the purpose of proving the Particle Flow Algorithm concept for the International Linear Collider. Given the unique requirements of a Particle Flow Algorithm calorimeter, custom readout electronics must be developed to service these detectors. This paper introduces the DCal or Digital Calorimetry Chip, a custom integrated circuit developed in a 0.25um CMOS process speci… more
Date: October 1, 2005
Creator: Hoff, James R.; Mekkaoui, Abderrazek; Yarema, Ray; /Fermilab; Drake, Gary; Repond, Jose et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Final report on LDRD project :leaky-mode VCSELs for photonic logic circuits.

Description: This report describes the research accomplishments achieved under the LDRD Project ''Leaky-mode VCSELs for photonic logic circuits''. Leaky-mode vertical-cavity surface-emitting lasers (VCSELs) offer new possibilities for integration of microcavity lasers to create optical microsystems. A leaky-mode VCSEL output-couples light laterally, in the plane of the semiconductor wafer, which allows the light to interact with adjacent lasers, modulators, and detectors on the same wafer. The fabrication o… more
Date: November 1, 2005
Creator: Hargett, Terry W.; Hadley, G. Ronald; Serkland, Darwin Keith; Blansett, Ethan L.; Geib, Kent Martin; Sullivan, Charles Thomas et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Robust large-scale parallel nonlinear solvers for simulations.

Description: This report documents research to develop robust and efficient solution techniques for solving large-scale systems of nonlinear equations. The most widely used method for solving systems of nonlinear equations is Newton's method. While much research has been devoted to augmenting Newton-based solvers (usually with globalization techniques), little has been devoted to exploring the application of different models. Our research has been directed at evaluating techniques using different models tha… more
Date: November 1, 2005
Creator: Bader, Brett William; Pawlowski, Roger Patrick & Kolda, Tamara Gibson (Sandia National Laboratories, Livermore, CA)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Persistence Length Control of the Polyelectrolyte Layer-by-Layer Self-Assembly on Carbon Nanotubes

Description: One-dimensional inorganic materials such as carbon nanotubes1 and semiconductor nanowires have been central to important advances in materials science in the last decade. Unique mechanical and electronic properties of these molecular-scale wires enabled a variety of applications ranging from novel composite materials, to electronic circuits, to new sensors. Often, these applications require non-covalent modification of carbon nanotubes with organic compounds, DNA and biomolecules, and polymers … more
Date: April 30, 2005
Creator: Huang, S. J.; Artyukhin, A. B.; Wang, Y.; Ju, J.; Stroeve, P. & Noy, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Solid-state modulators for RF and fast kickders

Description: As the switching capabilities of solid-state devices increase, these devices are being incorporated into modulator designs for high voltage accelerator applications. Solid-state modulators based on inductive adder circuit topology have demonstrated great versatility with regard to pulse width and pulse repetition rate while maintaining fast pulse rise and fall times. Additionally, these modulators are capable of being scaled to higher output voltage and power levels. An explanation of the basic… more
Date: May 5, 2005
Creator: Cook, E. G.; Akana, G.; Gower, E. J.; Hawkins, S. A.; Hickman, B. C.; Brooksby, C. A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen