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295,605 Matching Results

Start Over Decade 2000-2009

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(open access)

Comparison of Dye-Sensitized Rutile- and Anatase-Based TiO2 Solar Cells

The objective of this work is to develop and optimize the new dye-sensitized solar cell technology. In view of the infancy of rutile material development for solar cells, the PV response of the dye-sensitized rutile-based solar cell is remarkably close to that of the anatase-based cell.

Date: January 1, 2000

Creator: Park, N. G.; van de Lagemaat, J. & Frank, A. J.

Object Type: Article

System: The UNT Digital Library

(open access)

Competitive ancillary service procurement in California

California has undertaken a major restructuring of its electricity utility sector. Most electricity is now sold in open markets operated by the PX and other entities. Bilateral contracting among some market participants is also permitted. A group of independent generating companies bids into these markets together with out of state resources. In addition to these markets, CAISO operates markets for both imbalance energy and AS, a quite unusual feature of the California system. These markets were initially quite chaotic and were rife with market power problems. However, various reforms have now created a system that functions well. During the restructuring process, special provisions were made to protect public purpose programs, including renewable generation.

Date: January 1, 2000

Creator: Marnay, Chris; Siddiqui, Afzal S. & Khavkin, Mark

Object Type: Article

System: The UNT Digital Library

(open access)

The Complete Fast Fourier Transform and Cascaded Transition-Band Filters to Reduce the Noise of Deconvolution

A measurement system's components: cabling, delay line, waveform recorder, etc., degrade acquired signals and their respective bandlimited frequency responses. Compensation software corrects for this frequency-dependent spectral degradation by deconvolving the transfer function of the entire measurement system out of the measured signal spectra. This report describes methods to transfer the characteristics of a wide bandwidth repetitive sampling oscilloscope to a single-shot transient digitizer, characterize the measurement system, develop a cascaded transition-band filter, and compensate data acquired with the filtered, characterized measurement system. These procedures are easily implemented, execute quickly, and successfully compensate waveforms possessing endpoint discontinuities. Waveforms possessing endpoint discontinuities are made to appear duration-limited and continuous. The spectra for these modified waveforms are correct, including at dc. The deconvolution process introduces unavoidable noise. Filtering is applied to reduce the deconvolution noise while minimally affecting compensated waveform risetime and amplitude. Resultant compensated data retains its initial dc baseline offset with improved waveform fidelity and low noise of deconvolution.

Date: January 1, 2000

Creator: Patterson, P.E.

Object Type: Report

System: The UNT Digital Library

(open access)

Composite electrodes for advanced electrochemical applications. Quarterly report for the period October 1, - December 31, 1999

The electrochemical industry is one of the most highly energy intensive industries today. However, there have been no significant advances in the electrodes that these industries use. The dimensionally stable anode (DSA), which ELTECH introduced under a license agreement, has been the industry standard for the past twenty-five years. But, DSAs are nearing the end of their technological prevalence. The principal problems with DSAs include high capital and operating costs, and the proprietary nature of the technology. In addition, DSAs experience problems that include: contamination of the process solution by anode materials, failure when the electrocatalytic coating peels from underattack, generally low anode performance due to inherent limitations in operating current density, and short anode lifetime because of corrosion. The proposed innovation combines the low electrical resistance of copper with the corrosion resistance of electrically conductive diamond to achieve energy efficient, long-lifetime electrodes for electrochemistry. The proposed work will ultimately develop a composite electrode that consists of a copper substrate, a conductive diamond coating, and a catalytic precious metal coating. The scope of the current work includes preparation, testing, and evaluation of diamond-coated titanium electrodes.

Date: January 1, 2000

Creator: Kovach, Chris

Object Type: Report

System: The UNT Digital Library

(open access)

Composite wire plasma formation and evolution

The detailed understanding of the formation and evolution of plasma from rapidly heated metallic wires is a long-standing challenge in the field of plasma physics and in exploding wire engineering. This physical process is made even more complicated if the wire material is composed of a number of individual layers. The authors have successfully developed both optical and x-ray backlighting diagnostics. In particular, the x-ray backlighting technique has demonstrated the capability for quantitative determination of the plasma density over a wide range of densities. This diagnostic capability shows that the process of plasma formation is composed of two separate phases: first, current is passed through a cold wire and the wire is heated ohmically, and, second, the heated wire evolves gases that break down and forms a low-density plasma surrounding the wire.

Date: January 1, 2000

Creator: Spielman, Rick B.

Object Type: Report

System: The UNT Digital Library

(open access)

A comprehensive landscape approach for monitoring bats on the Nevada Test Site in south-central Nevada

The Nevada Test Site (NTS) is located in south-central Nevada and encompasses approximately 3,497 square kilometers (1,350 square miles). It straddles both the Mojave and Great Basin Deserts and includes a distinct transition region between these two deserts. Because of its geographical location, a great level of vegetative and physiographic diversity exists on the NTS. Also, numerous mines and tunnels are found on the NTS which are potential roost sites for bats. Multiple technqiues are being used to inventory and monitor the bat fauna on the NTS. These techniques include mistnetting at water sources with concurrent use of the Anabat II bat detection system, conducting road surveys with the Anabat II system, and conducting exit surveys at mine and tunnel entrances using the Anabat II system. To date, a total of 13 species of bats has been documented on the NTS, of which six are considered species of concern by the US Fish and Wildlife Service. These include Townsend's big-eared bat (Corynorhinus townsendii), spotted bat (Euderma maculatum), small-footed myotis (Myotis ciliolabrum), long-eared myotis (M. evotis), fringed myotis (M. thysanodes), and long-legged myotis (M. volans). Results from mistnet and Anabat surveys reveal that all bat species of concern except for the …

Date: January 1, 2000

Creator: Hall, D.

Object Type: Article

System: The UNT Digital Library

(open access)

[Comprehensive Resume]

The detailed resume of an aspiring candidate for the Marcus Fellows Program, offering a comprehensive overview of the individual's academic and professional achievements, skills, and qualifications.

Date: 2000

Creator: unknown

Object Type: Text

System: The UNT Digital Library

(open access)

Computer-specific metrics for the regulation and load following ancillary services

In competitive electricity markets, the costs for each ancillary service should be charged to those who cause the costs to be incurred with charges based on the factors that contribute to these costs. For example, the amount of generating capacity assigned to the regulation service is a function of the short-term volatility of system load. Therefore, the charges for regulation should be related to the volatility of each load, not to its average demand. This report discusses the economic efficiency and equity benefits of assessing charges on the basis of customer-specific costs (rather than the traditional billing determinants, MWh or MW), focusing on two key real-power ancillary services, regulation and load following. The authors determine the extent to which individual customers and groups of customers contribute to the system's generation requirements for these two services. In particular, they analyze load data to determine whether some customers account for shares of these two services that differ substantially from their shares of total electricity consumption.

Date: January 1, 2000

Creator: Kirby, B. & Hirst, E.

Object Type: Report

System: The UNT Digital Library

Concentrations 34: Shirin Neshat [Exhibition Photographs]

Photographs of the exhibition "Concentrations 34: Shirin Neshat," January 13-April 2, 2000, held at the Dallas Museum of Art. Photographs documenting this exhibition include twenty gallery installation views.

Date: 2000

Creator: Dallas Museum of Art

Object Type: Collection

System: The Portal to Texas History

Concentrations 34: Shirin Neshat [Photograph DMA_1580-01]

Photograph of the exhibition "Concentrations 34: Shirin Neshat," January 13-April 2, 2000, held at the Dallas Museum of Art.

Date: 2000

Creator: Dallas Museum of Art

Object Type: Photograph

System: The Portal to Texas History

Concentrations 34: Shirin Neshat [Photograph DMA_1580-02]

Photograph of the exhibition "Concentrations 34: Shirin Neshat," January 13-April 2, 2000, held at the Dallas Museum of Art.

Date: 2000

Creator: Dallas Museum of Art

Object Type: Photograph

System: The Portal to Texas History

Concentrations 34: Shirin Neshat [Photograph DMA_1580-03]

Photograph of the exhibition "Concentrations 34: Shirin Neshat," January 13-April 2, 2000, held at the Dallas Museum of Art.

Date: 2000

Creator: Dallas Museum of Art

Object Type: Photograph

System: The Portal to Texas History

Concentrations 34: Shirin Neshat [Photograph DMA_1580-04]

Photograph of the exhibition "Concentrations 34: Shirin Neshat," January 13-April 2, 2000, held at the Dallas Museum of Art.

Date: 2000

Creator: Dallas Museum of Art

Object Type: Photograph

System: The Portal to Texas History

Concentrations 34: Shirin Neshat [Photograph DMA_1580-05]

Photograph of the exhibition "Concentrations 34: Shirin Neshat," January 13-April 2, 2000, held at the Dallas Museum of Art.

Date: 2000

Creator: Dallas Museum of Art

Object Type: Photograph

System: The Portal to Texas History

Concentrations 34: Shirin Neshat [Photograph DMA_1580-06]

Photograph of the exhibition "Concentrations 34: Shirin Neshat," January 13-April 2, 2000, held at the Dallas Museum of Art.

Date: 2000

Creator: Dallas Museum of Art

Object Type: Photograph

System: The Portal to Texas History

Concentrations 34: Shirin Neshat [Photograph DMA_1580-07]

Photograph of the exhibition "Concentrations 34: Shirin Neshat," January 13-April 2, 2000, held at the Dallas Museum of Art.

Date: 2000

Creator: Dallas Museum of Art

Object Type: Photograph

System: The Portal to Texas History

Concentrations 34: Shirin Neshat [Photograph DMA_1580-08]

Photograph of the exhibition "Concentrations 34: Shirin Neshat," January 13-April 2, 2000, held at the Dallas Museum of Art.

Date: 2000

Creator: Dallas Museum of Art

Object Type: Photograph

System: The Portal to Texas History

Concentrations 34: Shirin Neshat [Photograph DMA_1580-09]

Photograph of the exhibition "Concentrations 34: Shirin Neshat," January 13-April 2, 2000, held at the Dallas Museum of Art.

Date: 2000

Creator: Dallas Museum of Art

Object Type: Photograph

System: The Portal to Texas History

Concentrations 34: Shirin Neshat [Photograph DMA_1580-10]

Photograph of the exhibition "Concentrations 34: Shirin Neshat," January 13-April 2, 2000, held at the Dallas Museum of Art.

Date: 2000

Creator: Dallas Museum of Art

Object Type: Photograph

System: The Portal to Texas History

Concentrations 34: Shirin Neshat [Photograph DMA_1580-11]

Photograph of the exhibition "Concentrations 34: Shirin Neshat," January 13-April 2, 2000, held at the Dallas Museum of Art.

Date: 2000

Creator: Dallas Museum of Art

Object Type: Photograph

System: The Portal to Texas History

Concentrations 34: Shirin Neshat [Photograph DMA_1580-12]

Photograph of the exhibition "Concentrations 34: Shirin Neshat," January 13-April 2, 2000, held at the Dallas Museum of Art.

Date: 2000

Creator: Dallas Museum of Art

Object Type: Photograph

System: The Portal to Texas History

Concentrations 34: Shirin Neshat [Photograph DMA_1580-13]

Photograph of the exhibition "Concentrations 34: Shirin Neshat," January 13-April 2, 2000, held at the Dallas Museum of Art.

Date: 2000

Creator: Dallas Museum of Art

Object Type: Photograph

System: The Portal to Texas History

Concentrations 34: Shirin Neshat [Photograph DMA_1580-14]

Photograph of the exhibition "Concentrations 34: Shirin Neshat," January 13-April 2, 2000, held at the Dallas Museum of Art.

Date: 2000

Creator: Dallas Museum of Art

Object Type: Photograph

System: The Portal to Texas History

Concentrations 34: Shirin Neshat [Photograph DMA_1580-15]

Photograph of the exhibition "Concentrations 34: Shirin Neshat," January 13-April 2, 2000, held at the Dallas Museum of Art.

Date: 2000

Creator: Dallas Museum of Art

Object Type: Photograph

System: The Portal to Texas History