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The Effects of Externally Solidified Product on Wave Celerity and Quality of Die Cast Products

The Effects of Externally Solidified Product on Wave Celerity and Quality of Die Cast Products

Date: October 10, 2003
Creator: Mobley, Carroll; Sahai, Yogeshwar & Brevick, Jerry
Description: The cold chamber die casting process is used to produce essentially all the die cast aluminum products and about 50% of the die cast magnesium products made today. Modeling of the cold chamber die casting process and metallographic observations of cold chamber die cast products indicate that typically 5 to 20% of the shot weight is solidified in the shot sleeve before or during cavity filling. The protion of the resulting die casting which is solidified in the shot sleeve is referred to as externally solidified product, or, when identified as a casting defect, as cold flakes. This project was directed to extending the understanding of the effects of externally solidified product on the cold chamber die casting process and products to enable the production of defect-free die castings and reduce the energy associated with these products. The projected energy savings from controlling the fraction of externally solidified product in die cast components is 40 x 10 Btu through the year 2025.
Contributing Partner: UNT Libraries Government Documents Department
Effects of extreme surface cooling on boundary-layer transition

Effects of extreme surface cooling on boundary-layer transition

Date: October 1, 1957
Creator: Jack, John R; Wisniewski, Richard J & Diaconis, N S
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Effects of extreme surface cooling on boundary-layer transition

Effects of extreme surface cooling on boundary-layer transition

Date: October 1, 1957
Creator: Jack, J. R.; Wisniewski, R. J. & Diaconis, N. S.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Effects of fabrication-type roughness on turbulent skin friction at supersonic speeds

Effects of fabrication-type roughness on turbulent skin friction at supersonic speeds

Date: July 1, 1958
Creator: Czarnecki, K R; Sevier, John R , Jr & Carmel, Melvin M
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Effects of fast chemical reactions on estimated emission fluxes of NO{sub x} from soil.

Effects of fast chemical reactions on estimated emission fluxes of NO{sub x} from soil.

Date: October 10, 2001
Creator: Kotamarthi, V. R. & Wesely, M. L.
Description: No abstract prepared.
Contributing Partner: UNT Libraries Government Documents Department
Effects of Fault Displacement on Emplacement Drifts

Effects of Fault Displacement on Emplacement Drifts

Date: April 25, 2000
Creator: Duan, F.
Description: The purpose of this analysis is to evaluate potential effects of fault displacement on emplacement drifts, including drip shields and waste packages emplaced in emplacement drifts. The output from this analysis not only provides data for the evaluation of long-term drift stability but also supports the Engineered Barrier System (EBS) process model report (PMR) and Disruptive Events Report currently under development. The primary scope of this analysis includes (1) examining fault displacement effects in terms of induced stresses and displacements in the rock mass surrounding an emplacement drift and (2 ) predicting fault displacement effects on the drip shield and waste package. The magnitude of the fault displacement analyzed in this analysis bounds the mean fault displacement corresponding to an annual frequency of exceedance of 10{sup -5} adopted for the preclosure period of the repository and also supports the postclosure performance assessment. This analysis is performed following the development plan prepared for analyzing effects of fault displacement on emplacement drifts (CRWMS M&O 2000). The analysis will begin with the identification and preparation of requirements, criteria, and inputs. A literature survey on accommodating fault displacements encountered in underground structures such as buried oil and gas pipelines will be conducted. For a ...
Contributing Partner: UNT Libraries Government Documents Department
EFFECTS OF FAULT DISPLACEMENT ON EMPLACEMENT DRIFTS

EFFECTS OF FAULT DISPLACEMENT ON EMPLACEMENT DRIFTS

Date: March 4, 2002
Creator: NA
Description: No abstract prepared.
Contributing Partner: UNT Libraries Government Documents Department
EFFECTS OF FAULTED STRATIGRAPHY ON SATRUATED ZONE FLOW BENEATH YUCCA MOUNTAIN, NEVADA

EFFECTS OF FAULTED STRATIGRAPHY ON SATRUATED ZONE FLOW BENEATH YUCCA MOUNTAIN, NEVADA

Date: January 29, 1999
Creator: OLDENBUR, ANDREW J.B. COHAN AND CURTIS M.
Description: We have analyzed evaporation in high-level waste emplacement boreholes in unsaturated rock. Water dripping onto waste containers is assumed to spread and form a thin film on the container surface. Evaporation will occur due to decay heat and the difference in vapor pressure between water in a flat film and water held in rock pores with curved interfaces. They study evaporation in still air in the one-dimensional system shown in Figure 1. {delta} is the liquid film thickness and L + {delta} is the gap width. They assume motionless liquid-gas interfaces, ideal gases, constant total gas pressure, no gravitational effects, and local thermodynamic equilibrium between water liquid and vapor. Vapor pressure on the water film is described by Clapeyron equation. Vapor pressure in rock pores is described by Kelvin and Clapeyron equations. They solve the coupled energy conduction in liquid and vapor. Vapor pressure on the water film is described by Clapeyron equation. Vapor pressure in rock pores is described by Kelvin and Clapeyron equations. They solve the coupled energy (conduction in liquid and conduction and convection in gas) and mass (vapor-air binary diffusion) transport equations for quasi steady state to obtain the evaporative flux as a function of time.
Contributing Partner: UNT Libraries Government Documents Department
EFFECTS OF FAULTED STRATIGRAPHY ON SATURATED ZONE FLOW BENEATH YUCCA MOUNTAIN, NEVADA

EFFECTS OF FAULTED STRATIGRAPHY ON SATURATED ZONE FLOW BENEATH YUCCA MOUNTAIN, NEVADA

Date: July 29, 1999
Creator: OLDENBURG, ANDREW J.B. COHEN AND CURTIS M.
Description: The S{sup 4}Z Model (''sub-site-scale saturated zone'') is a 3-D TOUGH2 model that was developed to study the saturated zone (SZ) at Yucca Mountain, Nevada, and to aid in the design and analysis of hydrologic tests. Yucca Mountain is the proposed site for a nuclear waste repository for the United States. The model covers an area of approximately 100 km{sup 2} around Yucca Mountain, as shown in Figure 1. The proposed repository is located in the unsaturated zone, immediately above the area of equidimensional gridblocks east of Solitario Canyon fault, which defines the crest of Yucca Mountain. The finely discretized region near the center of the domain corresponds to the area near a cluster of boreholes used for hydraulic and tracer testing. This discretization facilitates simulation of tests conducted there. The hydrogeologic structure beneath the mountain is comprised of dipping geologic units of variable thickness which are offset by faults. One of the primary objectives of the S{sup 4}Z modeling effort is to study the potential effects of the faulted structure on flow. Therefore, replication of the geologic structure in the model mesh is necessary. This paper summarizes (1) the mesh discretization used to capture the faulted geologic structure, and ...
Contributing Partner: UNT Libraries Government Documents Department
Effects of federal policies on extracorporeal shock wave lithotripsy

Effects of federal policies on extracorporeal shock wave lithotripsy

Date: May 1986
Creator: United States. Congress. Office of Technology Assessment.
Description: A report on OTA’s assessment of payment for physician services: strategies for medicare
Contributing Partner: UNT Libraries Government Documents Department