Inelastic chaotic scattering on a Bose-Einstein condensate

We devise a microscopic scattering approach to probe the excitation spectrum of a Bose-Einstein condensate. We show that the experimentally accessible scattering cross section exhibits universal Ericson fluctuations, with characteristic properties rooted in the underlying classical field equations.Comment: 11 pages, 5 figure

Hogwash: Coming to Terms with Critical Race Theory in Adult Education

Today’s adult and community education classrooms and sites of practice are increasingly diverse. As adult educators, we have a responsibility to appropriately meet each student at their level of need. Critical race theory provides a non-hegemonic lens for understanding and meeting the needs of our diverse student population

Evaporative-cooling potential for office buildings

This paper presents the results of both a performance and an economic assessment of the evaporative-cooling potential for office buildings in 11 US climate zones. Evaporative-cooling systems of the direct and combined direct/indirect type that are part of the heating, ventilating and air-conditioning (HVAC) system were evaluated. Thermal-storage strategies were not considered in this study. The DOE-2 building-energy-analysis computer program was used to simulate the evaporative-cooling performance of typical single-story and multistory office buildings. Performance results are presented as energy and peak demand reductions for each type of office building in each climate zone. Economic results are summarized as investment targets and aggregate/energy cost savings

Data Compilation for AGR-3/4 Designed-to-Fail (DTF) Fuel Particle Batch LEU04-02DTF

This document is a compilation of coating and characterization data for the AGR-3/4 designed-to-fail (DTF) particles. The DTF coating is a high density, high anisotropy pyrocarbon coating of nominal 20 {micro}m thickness that is deposited directly on the kernel. The purpose of this coating is to fail early in the irradiation, resulting in a controlled release of fission products which can be analyzed to provide data on fission product transport. A small number of DTF particles will be included with standard TRISO driver fuel particles in the AGR-3 and AGR-4 compacts. The ORNL Coated Particle Fuel Development Laboratory 50-mm diameter fluidized bed coater was used to coat the DTF particles. The coatings were produced using procedures and process parameters that were developed in an earlier phase of the project as documented in 'Summary Report on the Development of Procedures for the Fabrication of AGR-3/4 Design-to-Fail Particles', ORNL/TM-2008/161. Two coating runs were conducted using the approved coating parameters. NUCO425-06DTF was a final process qualification batch using natural enrichment uranium carbide/uranium oxide (UCO) kernels. After the qualification run, LEU04-02DTF was produced using low enriched UCO kernels. Both runs were inspected and determined to meet the specifications for DTF particles in section 5 of the AGR-3 & 4 Fuel Product Specification (EDF-6638, Rev.1). Table 1 provides a summary of key properties of the DTF layer. For comparison purposes, an archive sample of DTF particles produced by General Atomics was characterized using identical methods. This data is also summarized in Table 1

Analysis of Energy Efficiency Measures in Rehabilitation of Multifamily Housing Units

An apartment building in Austin, Texas, and one in Boston, Massachusetts, were analyzed to determine the cost-effectiveness of energy efficiency measures. To determine expected energy and cost savings resulting from a set of proposed retrofit measures, hour-by-hour simulations were conducted using the DOE-2.1C building energy analysis computer program. Based on detailed audit data, supplemented by field-measurements in the case of the Austin apartment building, the simulations were run for base case (preretrofit) conditions for each building. Metered electricity and gas consumption was used to calibrate the input data. A series of proposed retrofit measures was run for each building using the calibrated preretrofit model as the reference. Annual energy and cost savings were calculated separately for each measure and for the combined set of measures. For the Austin building the combined set of 11 measures yielded expected savings of $3,710/year, a 42savings in site energy. The combination of the 7 measures considered for the Boston building yielded expected savings of$1.292/year, and annual energy savings of nearly 75%. Measured in situ air conditioner performance for two of the Austin apartments showed EERs of 5.70 and 5.55, indicating an efficiency degradation of 22% and 24%, respectively, after 16 years of operation

Water-Resources Investigations Report 83-4075

From purpose and scope: The purpose of this report is to present an analysis of the stream-aquifer system of the Santa Fe River basin, including the quantity and quality of water available from each source and their interrelation. Much information is available in previously published reports, but the basin has not been previously evaluated as a hydrologic unit

Results from ORNL Characterization of Nominal 350 µm LEUCO Kernels from the BWXT G73D-20-69302 Composite

This document is a compilation of characterization data obtained on the nominal 350 {micro}m low enrichment uranium oxide/uranium carbide kernels (LEUCO) produced by BWXT for the Advanced Gas Reactor Fuel Development and Qualification Program. A 4502 g composite of LEUCO kernels was produced at BWXT by combining kernels from 8 forming runs sintered in 6 separate lots. 2150 grams were shipped to ORNL. ORNL has performed size, shape, density, and microstructural analysis on riffled samples from the kernel composite

Evaluating Texas State University Energy Consumption According to Productivity

The Energy Utilization Index, energy consumption per square foot of floor area, is the most commonly used index of building energy consumption. However, a building or facility exists solely to support the activities of its occupants. Floor area alone is not a complete measure of the amount of service a facility provides. The energy consumption of a service institution, such as a university, could be evaluated according to its annual level of service. However, the variety of services delivered by an institution of higher education cannot be measured by a single, readily available number. Data Envelopment Analysis, a tool used primarily in management science, can find "benchmark" input consumption levels for productive entities with multiple inputs and outputs. It finds a consumption target for each form of energy consumed by an institution, based on the actual performance of comparable institutions. This method is applicable to the energy consumption of Texas state institutions of higher education

Determination of Retrofit Savings Using a Calibrated Building Energy Simulation Model

This paper presents the development of a methodology to determine retrofit energy savings in buildings when few measured preretrofit data are available. Calibration of the DOE-2 building energy analysis computer program for a 250,000 ft2 building at The University of Texas at Austin, using hourly data for a two-month preretrofit period, is detailed.. The process begins with the identification of the DOE-2 input parameters having the greatest uncertainty. Field measurements then determine those uncertain parameters that have a significant impact on total energy use. Finally, the few remaining parameters are systematically adjusted to match the preretrofit data. Using the calibrated model run for the postretrofit period, energy savings were calculated for whole-building electric, cooling, and heating energy use, and were compared with savings calculated using a regression model developed under the LoanSTAR program. Finally, to validate the model, postretrofit DOE-2 results were compared with measured postretrofit data for a seven-month period

Analysis of a Fabric/Desiccant Window Cavity Dehumidifier

This paper presents the results of an exploratory study of a fabric/desiccant window cavity dehumidifier system for possible use in commercial buildings. The objective was to evaluate fabrics commonly used in buildings, and system concepts that employ these fabrics, which can be used to dehumidify room air. We developed a first-order energy/mass balance model to determine the performance of a window cavity dehumidifier that uses silica gel encapsulated in a fabric matrix rotating on a belt alternately through dehumidification and regeneration chambers; the modeling effort was supplemented by environmental chamber measurements of the moisture absorption characteristics of 16 fabric/desiccant combinations. We ran the model for a typical office building module, for outside air design conditions characteristic of the most difficult humidity regime in Texas. Two flow configurations, outside air and return air, were evaluated to determine the capability of such a system to dehumidify the air streams under consideration. Issues addressed included the physical limitations on the amount of desiccant that can be included in this configuration and the degree of dehumidification achievable