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266,377 Matching Results

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(open access)

1+ -n+ ECR Ion Source Development Test Stand

A test stand for the investigation of 1+-n+ charge boosting using an ECR ion sources is currently being assembled at the Texas A&M Cyclotron Institute. The ultimate goal is to relate the charge-boosting of ions of stable species to possible charge-boosting of ions of radioactive species extracted from the diverse, low-charge-state ion sources developed for radioactive ion beams.

Date: April 7, 2006

Creator: May, Donald P.

Object Type: Report

System: The UNT Digital Library

E-2 (4-9-17)

None

Date: April 9, 2017

Creator: unknown

Object Type: Photograph

System: The Gateway to Oklahoma History

E-2 (4-20-18)

Photograph of Purcell E-2.

Date: April 20, 2018

Creator: unknown

Object Type: Photograph

System: The Gateway to Oklahoma History

2.5" & 3.5" heavy pressure relief valve

Blueprint depicting technical details of Battleship Texas.

Date: April 23, 1914

Creator: unknown

Object Type: Technical Drawing

System: The Portal to Texas History

$2\beta + \gamma from B^0 to D^\mp K^0 \pi^\pm Decays at BaBar: aSimulation Study$ (open access)

2\beta + \gamma from B^0 to D^\mp K^0 \pi^\pm Decays at BaBar: aSimulation Study

The authors present the results of a simulation study to perform the extraction of 2{beta} + {gamma} from B{sup 0} {yields} D{sup {-+}}K{sup 0}{pi}{sup {+-}} decays through a time-dependent Dalitz analysis of BaBar data.

Date: April 16, 2007

Creator: Polci, Francesco; Schune, Marie-Helene; Stocchi, Achille & /Orsay, LAL

Object Type: Article

System: The UNT Digital Library

(open access)

2-D and 3-D Elastic Modeling with Shared Seismic Models

Several elastic models, both 2-D and 3-D, are being built for use in calculating synthetic elastic seismic data. The models will be made available to the research community, along with the synthetic data that are being calculated from them. These shared models have been proposed or contributed by participants in a collaborative industry, national laboratory, and university research project. The purpose of the modeling is to provide synthetic data to better understand elastic wave propagation and the effects of structural and stratigraphic complexities. The 2-D models are easier to design and change and synthetic calculations can be run relatively quickly in them. It will be possible to alter their layer properties and calculate time-lapse data sets from them. Field data will be available to accompany many of the 2-D models. 3-D models are more realistic, but more difficult to design and change. They also require considerably more computing resources to calculate synthetic data from them. A new 3-D model is being designed, and will be used for computing synthetic elastic data.

Date: April 30, 2002

Creator: House, L.; Marfurt, K. J.; Larsen, S. & Martin, G. S.

Object Type: Article

System: The UNT Digital Library

2" HP valve with locking device for whistle & siren

Blueprint depicting technical details of Battleship Texas.

Date: April 29, 1914

Creator: unknown

Object Type: Technical Drawing

System: The Portal to Texas History

2" Standard High Lift Sea Valve Boiler Blows Pressure 101 - 300 Lbs. [Boiler Room]

Blueprint depicting technical details of Battleship Texas.

Date: April 2, 1927

Creator: unknown

Object Type: Technical Drawing

System: The Portal to Texas History

[$3.00 slide]

Photograph of a sheet of paper taped against a wall that is label "$3.00."

Date: April 4, 1958

Creator: WBAP-TV (Television station : Fort Worth, Tex.)

Object Type: Photograph

System: The UNT Digital Library

E-3 (4-25-21)

Photograph of Goldsby FD Engine 3, a 1999 Freightliner/Central States pumper.

Date: April 25, 2021

Creator: unknown

Object Type: Photograph

System: The Gateway to Oklahoma History

3.5" heavy pressure valve

Blueprint depicting technical details of Battleship Texas.

Date: April 30, 1912

Creator: unknown

Object Type: Technical Drawing

System: The Portal to Texas History

(open access)

A 3-Axis Force Balanced Accelerometer Using a Single Proof-Mass

This paper presents a new method for wideband force balancing a proof-mass in multiple axes simultaneously. Capacitive position sense and force feedback are accomplished using the same air-gap capacitors through time multiplexing. Proof of concept is experimentally demonstrated with a single-mass monolithic surface micromachined 3-axis accelerometer.

Date: April 1997

Creator: Lemkin, M.A.; Boser, B.E.; Auslander, D. & Smith, J.

Object Type: Article

System: The UNT Digital Library

3" Combined Feed [Valve]

Blueprint depicting technical details of Battleship Texas.

Date: April 9, 1935

Creator: unknown

Object Type: Technical Drawing

System: The Portal to Texas History

$3-D elastic wave scattering by a layer containing vertical periodic fractures$ (open access)

3-D elastic wave scattering by a layer containing vertical periodic fractures

None

Date: April 30, 2002

Creator: Nakagawa, Seiji; Nihei, Kurt T.; Myer, Larry R. & Majer, Ernest L.

Object Type: Article

System: The UNT Digital Library

(open access)

A 3-D Model of Signaling and Transport Pathways in Epithelial Cells

A 3-dimensional computer model was developed to simulate the spatial and chemical evolution of calcium ions inside an array of human epithelial kidney cells. This is a prototype model, intended to develop a methodology to incorporate much more complex interactions of metabolic and other processes within many types of cells and lead to increased ability to predict cellular responses to disease as well as to chemical and biological warfare situations. Preliminary tests of the model are described.

Date: April 1, 2005

Creator: Quong, Andrew A. & Westbrook, Charles K.

Object Type: Report

System: The UNT Digital Library

$A 3-Dimensional discrete fracture network generator to examine fracture-matrix interaction using TOUGH2$ (open access)

A 3-Dimensional discrete fracture network generator to examine fracture-matrix interaction using TOUGH2

Water fluxes in unsaturated, fractured rock involve the physical processes occurring at fracture-matrix interfaces within fracture networks. Modeling these water fluxes using a discrete fracture network model is a complicated effort. Existing preprocessors for TOUGH2 are not suitable to generate grids for fracture networks with various orientations and inclinations. There are several 3-D discrete-fracture-network simulators for flow and transport, but most of them do not capture fracture-matrix interaction. We have developed a new 3-D discrete-fracture-network mesh generator, FRACMESH, to provide TOUGH2 with information about the fracture network configuration and fracture-matrix interactions. FRACMESH transforms a discrete fracture network into a 3 dimensional uniform mesh, in which fractures are considered as elements with unique rock material properties and connected to surrounding matrix elements. Using FRACMESH, individual fractures may have uniform or random aperture distributions to consider heterogeneity. Fracture element volumes and interfacial areas are calculated from fracture geometry within individual elements. By using FRACMESH and TOUGH2, fractures with various inclinations and orientations, and fracture-matrix interaction, can be incorporated. In this paper, results of flow and transport simulations in a fractured rock block utilizing FRACMESH are presented.

Date: April 9, 2003

Creator: Ito, Kazumasa & Yongkoo, Seol

Object Type: Article

System: The UNT Digital Library

(open access)

3-dimensional wells and tunnels for finite element grids

Modeling fluid, vapor, and air injection and extraction from wells poses a number of problems. The length scale of well bores is centimeters, the region of high pressure gradient may be tens of meters and the reservoir may be tens of kilometers. Furthermore, accurate representation of the path of a deviated well can be difficult. Incorporating the physics of injection and extraction can be made easier and more accurate with automated grid generation tools that incorporate wells as part of a background mesh that represents the reservoir. GEOMESH is a modeling tool developed for automating finite element grid generation. This tool maintains the geometric integrity of the geologic framework and produces optimal (Delaunay) tetrahedral grids. GEOMESH creates a 3D well as hexagonal segments formed along the path of the well. This well structure is tetrahedralized into a Delaunay mesh and then embedded into a background mesh. The well structure can be radially or vertically refined and each well layer is assigned a material property or can take on the material properties of the surrounding stratigraphy. The resulting embedded well can then be used by unstructured finite element models for gas and fluid flow in the vicinity of wells or tunnels. …

Date: April 1, 1996

Creator: Cherry, T.A.; Gable, C.W. & Trease, H.

Object Type: Report

System: The UNT Digital Library

(open access)

[3 Letters from Donald J. Maison]

Copies of three letters from Donald J. Maison: a carbon copy of a letter from Maison to Chief Prosecutor (dated April 16, 1980), copy of a letter from Maison to Steve Tokoley (dated April 7, 1980), and carbon copy of letter from Maison to Bill Arnold (dated March 26, 1980).

Date: April 16, 1980

Creator: Maison, Donald J.

Object Type: Letter

System: The UNT Digital Library

[3 Levels of Interactions presentation at APAEC 2011]

Photograph of a presentation "3 Levels of Interactions" at APAEC 2011, held by UNT Special Collections. The image shows a room filled with people sitting down, a presenter can be seen at the front of the room near the top right. On the top left a projector screen can be seen, with it containing a chart titled "3 Levels of Interactions" with two columns following it. APAEC stands for Asian Pacific American Empowerment Conference, an annual conference that happens every year at UNT.

Date: April 20, 2011

Creator: unknown

Object Type: Photograph

System: The UNT Digital Library