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Pasquill`s influence: on the evaporation from various liquids into the atmosphere

Description: Pasquill`s development of an evaporation model as well as his experimental work on the subject are important in view of the recent emphasis on toxic chemical releases to the environment. Pasquill`s contributions to the field of atmospheric diffusion are enormous and well-known. The Pasquill stability classification enables us to apply the Gaussian diffusion model in our daily life. The Gaussian diffusion model has been widely and routinely applied in industry for the estimate of the air concentration ant to manage the radioactive and hazardous wastes in recent years. Equally important bus no less than his contribution to the Gaussian diffusion model is Pasquill`s influence on the subject of evaporation from various liquid surfaces into the atmosphere. An evaporation model taking into account the vertical variations of the mean wind speed and the eddy exchange was first introduced by Sutton. The Sutton model made it possible to estimate toxic chemical release from a smooth liquid surface to the environment. In the Sutton model, the process of vapor transfer is based on the momentum exchange involving a parameter of the air viscosity. Pasquill modified Sutton`s evaporation theory by introducing another new parameter, the molecular diffusivity. This replaced the viscosity in the Sutton model, an important missing parameter. The Sutton-Pasquill evaporation model has found wide applications in industry for half a century. Out of these two parameters, a non-dimensional parameter can be formed; it can be used to modify the Pasquill evaporation model. Experimental data in the laboratories and the fields indicate that the rate of evaporation from a liquid surface is dependent on a Schmidt number. Thus, in this study, we will consider the modification of the Sutton-Pasquill model and provide some theoretical justifications.
Date: September 1, 1995
Creator: Huang, C.H.
Partner: UNT Libraries Government Documents Department

Gust-rise exceedance statistics for wind turbine design

Description: When designing a wind machine, the number of large amplitude gusts for the design-life exposure of a wind machine should be estimated, because velocity change controls the acceleration rate of a rotor. Since the record length of data is insufficient, the theoretical study of gust rise may shed some light on the empirical formulation in which some important parameters may have been ignored. Fichtl developed an equation based on Rice's theory (1944, 1945), which estimates the total number of crossings with positive slope per unit of time that exceeds a prescribed level of velocity change. The analytical representation of Fichtl's formulation is presented, and useful results of the velocity change for the design life of a wind energy conversion system (WECS) are included.
Date: July 1, 1979
Creator: Huang, C.H. & Fichtl, G.H.
Partner: UNT Libraries Government Documents Department

Mass-consistent, interpolated wind fields for complex terrain

Description: Mass-consistent modeling is an attempt to derive snapshots of the mean wind field over a section of terrain from given sets of measured wind fields. The modeling scheme presented is based on the assumption that the best mass-conserving wind field is a strong function of the interpolation technique for the measured winds and a weak function of the mass conservation scheme. The proposed scheme includes the following special features: a terrain-following coordinate system, an arbitrarily defined upper boundary, and a provision for density stratification. The accuracy and utility of the scheme was tested against an analytically derived wind field flowing over an analytically defined terrain.
Date: September 1, 1980
Creator: Drake, R.L. & Huang, C.H.
Partner: UNT Libraries Government Documents Department

Shiva: An astronomical data analysis framework

Description: A key online and off-line software component of the Sloan Digital Sky Survey (SDSS) is Shiva. Shiva provides a readily extendible framework upon which the SDSS data reduction pipeline software is built. In this paper we present an introduction to the Shiva data analysis framework. We briefly discuss the features and the inherent prototyping and rapid development capabilities that make Shiva an integral part in the on-going development of SDSS software.
Date: December 1, 1995
Creator: Sergey, G.; Berman, E.; Huang, C.H.; Kent, S.; Newberg, H; Nicinski, T. et al.
Partner: UNT Libraries Government Documents Department

Object-oriented modeling and design for sloan digital sky survey retained data

Description: The SDSS project will produce tens of terabytes of data with nonionships among them and with uncertain complexity in their usage. The survey is being conducted by an international collaboration of eight institutions scattered throughout the US and Japan as well as numerous individuals at other sites. The data archive must provide adequate access to all collaborating partners during the five-year survey lifetime to support: development and testing of software algorithms; quality analysis on both the raw and processed data; selection of spectroscopic targets from the photometric catalogs; and scientific analysis. Additionally, the archive will serve as the basis for the public distribution of the final calibrated data on a timely basis. In this paper, we document how we applied Object-Oriented modeling design to the development of data archives. In the end, based on the experiences, we put Object-Orientation in a proper perspective.
Date: December 1, 1995
Creator: Huang, C.H.; Munn, J.; Yanny, B.; Kent, S.; Petravick, D.; Pordes, R. et al.
Partner: UNT Libraries Government Documents Department

X/Qs and unit dose calculations for Central Waste Complex interim safety basis effort

Description: The objective for this problem is to calculate the ground-level release dispersion factors (X/Q) and unit doses for onsite facility and offsite receptors at the site boundary and at Highway 240 for plume meander, building wake effect, plume rise, and the combined effect. The release location is at Central Waste Complex Building P4 in the 200 West Area. The onsite facility is located at Building P7. Acute ground level release 99.5 percentile dispersion factors (X/Q) were generated using the GXQ. The unit doses were calculated using the GENII code. The dimensions of Building P4 are 15 m in W x 24 m in L x 6 m in H.
Date: April 3, 1996
Creator: Huang, C. H.
Partner: UNT Libraries Government Documents Department

Determination of X/Qs for solid waste facility MSAR

Description: The purpose of this document is to provide a single referenceable document that provides the X/Qs for the solid waste facilities in the 200 Area, that is to provide the X/Qs for the Solid Waste Dispersal Facilities Master Safety Analysis Report (WHC-SD-WM-MSAR-001, REV. 0, 1996). The X/Qs will be used for the radiological dose estimates in the accident safety analyses. Thus, this document is also to provide the information necessary to perform bounding estimates of the radiological consequences for hypothetical accidents for various solid waste facilities. This document is to examine the variations in the plume dispersion factors associated with the various solid waste facilities. Specifically examined are X/Qs associated with different receptors located in different sectors and at different distances. Examination of one facility included a large area X/Q, while examination of another facility included an elevated release. Generally, the X/Qs are determined for ground releases with and without building wake. In addition, sensitivity of how plume characteristics were affected by using different meteorological data was examined. Each receptor described in this document was evaluated for both 99.5% and 50% meteorological data. Attributes such as plume meander, plume rise, settling and wash-out are not considered in this document.
Date: May 22, 1997
Creator: Huang, C. H.
Partner: UNT Libraries Government Documents Department

The X/Q values unit doses for spent nuclear fuel projects

Description: The purpose of this document is to provide a single referenceable document that provides the X/Qs for all the facilities in the spent nuclear fuel projects, and includes the bases for the X/Q calculations. The X/Q values for the nuclear fuel projects were calculated over the past several years. The values currently used in the nuclear fuel project were documented in letter reports and as attached to various PSEs and Safety Analysis documents. Therefore, there is a need to consolidate these documents or reports into a single referenceable document. The final document includes the X/Qs for KE and KW Basins, the cold vacuum drying facility, and the canister storage building.
Date: May 14, 1997
Creator: Huang, C. H.
Partner: UNT Libraries Government Documents Department