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in subjects: "Capacitors"

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Development of passive electronic components for instrumentation of improved geothermal logging tools and components. Annual progress report

Short term objectives for well-logging instrumentation are circuits which can operate at temperatures in the range 275/sup 0/C to 350/sup 0/C; the medium term goal is operation up to 500/sup 0/C, and the long term goal is to achieve operation at 1000/sup 0/C. It is apparent that useful electronic circuits will require the combination of both passive components and active devices. In order to meet the compatibility requirements, the basic technology which has been selected in this project is the… more

Date: October 20, 1977

Creator: Raymond, L.S.; Hamilton, D.J. & Kerwin, W.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

TRANSIENT RADIATION EFFECTS IN CAPACITORS AND DIELECTRIC MATERIALS

Measurements of dielectric leakage, capacitance, electric strength, andd charge scattering phenomena were performed at the Kukla and Godiva III critical assemblies for tantalum and aluminum electrolytic, wax- and oilimpregnated paper, mylar, mica, and ceramic capacitors, and for mylar and Vitamin B-impregnated paper. Leakage data indicate that gamma induced conductivity in capacitor dielectric varies directly with gamma DELTA , where gamma is the gamma radiation rate and DELTA is 0.9 for mylar,… more

Date: August 15, 1961

Creator: Wicklein, H. W. & Dickhaut, R. H.

Item Type: Book

Partner: UNT Libraries Government Documents Department

open access

Fractional charge search

A device to search for fractional charge in matter is described. The sample is coupled to a low-noise amplifier by a periodically varying capacitor and the resulting signal is synchronously detected. The varying capacitor is constructed as a rapidly spinning wheel. Samples of any material in volumes of up to 0.05 ml may be searched in less than an hour.

Date: June 1, 1982

Creator: Innes, W.; Klein, S.; Perl, M. & Price, J.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Development of a high-density energy-storage capacitor for Nova

This paper covers Maxwell's approach to developing energy storage capacitors. Based on previous capacitor designs of 3 KJ, 5 KJ and 10 KJ, the final Nova 12.5 KJ capacitor evolved. At the outset of the Nova capacitor development program, a relatively new dielectric system, polypropylene-paper-DOP, seemed to show superiority in volumetric efficiency, life, and more importantly cost. However, as a result of studies performed at Maxwell, a high-density, energy-storage capacitor was developed utili… more

Date: October 22, 1981

Creator: Haskell, D. K.; Cooper, R. A.; Sevigny, J. A.; Merritt, B. T.; Carder, B. M. & Whitham, K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A novel charge sensitive preamplifier without the feedback resistor

A novel charge sensitive preamplifier which has no resistor in parallel with the feedback capacitor is presented. No external device or circuit is required to discharge the feedback capacitor. The detector leakage and signal current flows away through the gate of the first JFET which works with its gate to source junction slightly forward biased. The DC stabilization of the preamplifier is accomplished by an additional feedback loop, which permits to equalize the current flowing through the for… more

Date: January 1, 1992

Creator: Bertuccio, G. (Politecnico di Milano, Milan (Italy). Dipt. di Elettronica e Informazione); Rehak, P. & Xi, D. (Brookhaven National Lab., Upton, NY (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Design of the ZT-40 power crowbar system

The design for a power crowbar system for ZT-40 to sustain a total current greater than 10/sup 7/ A with less than a 7% variation for 250 ..mu..s is discussed. The circuit performance without the power crowbar system is used to determine the power required. Several methods for supplying the power crowbar energy were investigated and simulated before choosing the final system. The advantages and disadvantages of the various options are also presented.

Date: January 1, 1977

Creator: Nunnally, W.C. & Boicourt, G.P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Development of Passive Electronic Components for Instrumentation of Improved Geothermal Logging Tools and Components. Semiannual Progress Report. Report No. 1. [For Temperatures Up to 500/sup 0/C]

Research progress is reported on the development of passive components, resistors, capacitors, metallization, and passivation, that will withstand well logging temperatures to 500/sup 0/C and have extremely low temperature coefficients. The lower the temperature coefficients, the more exacting the instrumentation designs can be without elaborate compensation techniques. The method of fabricating the thin film components is that of chemical vapor deposition (CVD) which is a major deviation from … more

Date: April 20, 1977

Creator: Raymond, L. S.; Hamilton, D. J. & Kerwin, W. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Design and test of a 40-kV, 80-A, 10-msec, neutral-beam power supply series

To meet neutral-beam source requirements, a combination series switch/regulator system has been developed that can provide up to 40-kV at 80A output for 10-ms from the continuously decaying voltage of a charged capacitor bank. The system uses 100% feedback control of a series hard tube regulator. This feedback regulator is able to maintain a 40-kV output level for 100% load variations while the source voltage for the capacitor bank is drained from an initial 55-kV down to as low as 43-kV during… more

Date: October 18, 1977

Creator: North, G.G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Engineering description of the LASL ZT-40 Toroidal Z-Pinch

The ZT-40 Toroidal Z-Pinch experiment is the largest and newest Z-Pinch to be built at Los Alamos. The experiment consists of a discharge tube with a minor diameter of 40 cm and an aspect ratio of 5.7 to 1. The theta and Z-fields are produced by two capacitor banks, each with 650 KJ (at 50 kV) of stored energy. The experiment is controlled by a ''Prime 400'' computer which is dedicated for ZT-40 use. The experiment is to be constructed in two phases. First with a passive crowbar system and then… more

Date: January 1, 1977

Creator: Hammer, C. F.; Dike, R. S. & Nunnally, W. C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Development of high-reliability, multikilohertz repetition-rate, fast-discharge components

The two basic components in pulsed-power technology are capacitors and switches. In order to develop these high-voltage components, a unique laboratory has been constructed using state-of-the-art diagnostic and shielding techniques. The laboratory is comprised of three basic systems: charging systems, (2) diagnostic systems, and (3) grounding and shielding systems.

Date: January 1, 1980

Creator: McDuff, G.; Rust, K.; Sarjeant, W. J. & Mace, P. N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Understanding and managing the effects of battery charger and inverter aging

An aging assessment of battery chargers and inverters was conducted under the auspices of the NRC's Nuclear Plant Aging Research (NPAR) Program. The intentions of this program are to resolve issues related to the aging and service wear of equipment and systems at operating reactor facilities and to assess their impact on safety. Inverters and battery chargers are used in nuclear power plants to perform significant functions related to plant safety and availability. The specific impact of a batt… more

Date: January 1, 1992

Creator: Gunther, W. (Brookhaven National Lab., Upton, NY (United States)) & Aggarwal, S. (Nuclear Regulatory Commission, Washington, DC (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Development of the switching components for ZT-40

Switching of the main capacitor banks for ZT-40 will be accomplished by spark gap switches. Initially, there will be 576 start switches and 288 crowbar switches. A development program is under way to develop three switches; (1) a versatile start switch, which can be used for both the I/sub z/ and the I/sub theta/ capacitor banks, with a wide operating voltage range, (2) a crowbar switch which is capable of crowbarring the circuit without the power crowbar bank, and (3) a power crowbar switch, w… more

Date: January 1, 1977

Creator: Melton, J. G.; Dike, R. S.; Hanks, K. W. & Nunnally, W. C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Development and fabrication of a solar cell junction processing system. Quarterly report No. 2, July 1980

The basic objectives of the program are the following: (1) to design, develop, construct and deliver a junction processing system which will be capable of producing solar cell junctions by means of ion implantation followed by pulsed electron beam annealing; (2) to include in the system a wafer transport mechanism capable of transferring 4-inch-diameter wafers into and out of the vacuum chamber where the ion implantation and pulsed electron beam annealing processes take place; (3) to integrate,… more

Date: July 1, 1980

Creator: Siesling, R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Characterization of internal boundary layer capacitors

Internal boundary layer capacitors were characterized by scanning transmission electron microscopy and by microscale electrical measurements. Data are given for the chemical and physical characteristics of the individual grains and boundaries, and their associated electric and dielectric properties. Segregated internal boundary layers were identified with resistivities of 10/sup 12/-10/sup 13/ ..cap omega..-cm. Bulk apparent dielectric constants were 10,000-60,000. A model is proposed to explai… more

Date: May 1, 1980

Creator: Park, H. D. & Payne, D. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Capacitor energy needed to induce transitions from the superconducting to the normal state

The purpose of this paper is to describe a technique to turn a long length of superconducting wire normal by dumping a charged capacitor into it and justify some formulae needed in the design. The physical phenomenon is described. A formula for the energy to be stored in the capacitor is given. There are circumstances where the dc in an electrical circuit containing superconducting elements has to be turned off quickly and where the most convenient way to switch the current off is to turn a lar… more

Date: August 1, 1985

Creator: Eberhard, P.H. & Ross, R.R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Investigation of multi-layer thin films for energy storage.

We investigate here the feasibility of increasing the energy density of thin-film capacitors by construction of a multi-layer capacitor device through ablation and redeposition of the capacitor materials using a high-power pulsed ion beam. The deposition experiments were conducted on the RHEPP-1 facility at Sandia National Laboratories. The dielectric capacitor filler material was a composition of Lead-Lanthanum-Zirconium-Titanium oxide (PLZT). The energy storage can be increased by using mater… more

Date: January 1, 2009

Creator: Renk, Timothy Jerome & Monson, Todd

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Barriers to the Application of High-Temperature Coolants in Hybrid Electric Vehicles

This study was performed by the Oak Ridge National Laboratory (ORNL) to identify practical approaches, technical barriers, and cost impacts to achieving high-temperature coolant operation for certain traction drive subassemblies and components of hybrid electric vehicles (HEV). HEVs are unique in their need for the cooling of certain dedicated-traction drive subassemblies/components that include the electric motor(s), generators(s), inverter, dc converter (where applicable), and dc-link capacit… more

Date: September 30, 2006

Creator: Hsu, J.S.; Staunton, M.R. & Starke, M.R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

A test protocol to screen capacitors for radiation-induced charge loss.

This report presents a test protocol for screening capacitors dielectrics for charge loss due to ionizing radiation. The test protocol minimizes experimental error and provides a test method that allows comparisons of different dielectric types if exposed to the same environment and if the same experimental technique is used. The test acceptance or screening method is fully described in this report. A discussion of technical issues and possible errors and uncertainties is included in this repor… more

Date: September 1, 2008

Creator: Zarick, Thomas Andrew & Hartman, E. Frederick

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

275 C Downhole Switched-Mode Power Supply

A vee-square (V2) control based controller IC is developed for a switch mode power supply capable of operating at extreme temperature/harsh environment conditions. A buck type regulator with silicon carbide power junction field effect transistors (JFET) as power devices is used to analyze the performance of controller. Special emphases are made on the analog sub-blocks--voltage reference, operational transconductance amplifier and comparator as individual building blocks. Transformer coupled ga… more

Date: August 31, 2008

Creator: Hutchens, Chris & Madhuravasal, Vijay

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Metal oxide coating of carbon supports for supercapacitor applications.

The global market for wireless sensor networks in 2010 will be valued close to $10 B, or 200 M units. TPL, Inc. is a small Albuquerque based business that has positioned itself to be a leader in providing uninterruptible power supplies in this growing market with projected revenues expected to exceed $26 M in 5 years. This project focused on improving TPL, Inc.'s patent-pending EnerPak{trademark} device which converts small amounts of energy from the environment (e.g., vibrations, light or temp… more

Date: July 1, 2008

Creator: Boyle, Timothy J.; Tribby, Louis, J.; Lakeman, Charles D. E.; Han, Sang M.; Lambert, Timothy N. & Fleig, Patrick F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Nanowires, Capacitors, and Other Novel Outer-Surface Components Involved in Electron Transfer to Fe(III) Oxides in Geobacter Species

The overall goal of this project was to better understand the mechanisms by which Geobacter species transfer electrons outside the cell onto Fe(III) oxides. The rationale for this study was that Geobacter species are often the predominant microorganisms involved in in situ uranium bioremediation and the growth and activity of the Geobacter species during bioremediation is primarily supported by electron transfer to Fe(III) oxides. These studies greatly expanded the understanding of electron tra… more

Date: December 22, 2008

Creator: Lovley, Derek, R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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ADC and TDC implemented using FPGA

Several tests of FPGA devices programmed as analog waveform digitizers are discussed. The ADC uses the ramping-comparing scheme. A multi-channel ADC can be implemented with only a few resistors and capacitors as external components. A periodic logic levels are shaped by passive RC network to generate exponential ramps. The FPGA differential input buffers are used as comparators to compare the ramps with the input signals. The times at which these ramps cross the input signals are digitized by t… more

Date: November 1, 2007

Creator: Wu, Jinyuan; Hansen, Sten & Shi, Zonghan

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

SYNTHESIS AND CHARACTERIZATION OF CARBON AEROGEL NANOCOMPOSITES CONTAINING DOUBLE-WALLED CARBON NANOTUBES

Carbon aerogels (CAs) are novel mesoporous materials with applications such as electrode materials for super capacitors and rechargeable batteries, adsorbents and advanced catalyst supports. To expand the potential application for these unique materials, recent efforts have focused on the design of CA composites with the goal of modifying the structure, conductivity or catalytic activity of the aerogel. Carbon nanotubes (CNTs) possess a number of intrinsic properties that make them promising ma… more

Date: March 11, 2008

Creator: Worsley, M A; Satcher, J H & Baumann, T F

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Evaluation and Characterization of Magnets and Capacitors

Advanced vehicle, fuel cell, hybrid electric vehicle (HEV), and plug in hybrid research and development is conducted by the U.S. Department of Energy (DOE) through its FreedomCAR and Vehicle Technologies (FCVT) program. The mission of this program is to develop more energy efficient and environmentally safe highway transportation technologies. Program activities include research, development, testing, technology validation, and technology transfer. These activities are done at the system and co… more

Date: October 15, 2006

Creator: Seiber, L. E.; Cunningham, J. P.; Golik, S. S. & Armstrong, G.

Item Type: Report

Partner: UNT Libraries Government Documents Department