Partner
Oklahoma Historical Society
616
UNT Libraries
233
Sterling Municipal Library
116
Abilene Library Consortium
109
UNT Libraries Government Documents Department
93
Livingston Municipal Library
62
Abilene Christian University Library
59
Comanche Public Library
36
South Plains College
34
Hondo Public Library
33
146 More
Collection
Texas Digital Newspaper Program
1,630
Tocker Foundation Grant
659
Oklahoma Digital Newspaper Program
634
Abilene Library Consortium
177
The Baytown Sun
114
The Oklahoma City Times
72
Chickasha Newspaper Collection
68
Office of Scientific & Technical Information Technical Reports
63
Polk County Newspapers
62
Sapulpa Herald
56
277 More
Country
Decade
Month
Day
Language
2,365 Matching Results
Results open in a new window/tab. Unexpected Results? Search the Catalog Instead.
Results:
1 - 24 of
2,365
next
Conroe Courier (Conroe, Tex.), Vol. 30, No. 35, Ed. 1 Friday, September 1, 1922
Weekly newspaper from Conroe, Texas that includes local, state, and national news along with advertising.
Date:
September 1, 1922
Creator:
Etheridge, O.
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Houston, Tex.), Vol. 44, No. 12, Ed. 1 Friday, February 1, 2013
Free weekly newspaper that includes business and classified advertising.
Date:
February 1, 2013
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 38, No. 624, Ed. 1 Friday, February 1, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
February 1, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Discussion of model calibration and validation for transient dynamics simulation.
Model calibration refers to a family of inverse problem-solving numerical techniques used to infer the value of parameters from test data sets. The purpose of model calibration is to optimize parametric or non-parametric models in such a way that their predictions match reality. In structural dynamics an example of calibration is the finite element model updating technology. Our purpose is essentially to discuss calibration in the broader context of model validation. Formal definitions are proposed and the notions of calibration and validation are illustrated using an example of transient structural dynamics that deals with the propagation of a shock wave through a hyper-foam pad. An important distinction that has not been made in finite element model updating and that is introduced here is that parameters of the numerical models or physical tests are categorized into input parameters, calibration variables, controllable and uncontrollable variables. Such classification helps to define model validation goals. Finally a path forward for validating numerical model is discussed and the relationship with uncertainty assessment is stressed.
Date:
January 1, 2001
Creator:
Hemez, François M.; Doebling, Scott W. & Wilson, Amanda C.
Object Type:
Article
System:
The UNT Digital Library
The Greensheet (Houston, Tex.), Vol. 43, No. 6, Ed. 1 Wednesday, February 1, 2012
Free weekly newspaper that includes business and classified advertising.
Date:
February 1, 2012
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Illustrated Paperboy (Cleveland, Tex.), Vol. 10, No. 6, Ed. 1 Wednesday, May 1, 2002
Weekly newspaper from Cleveland, Texas that includes local, county, and state news along with extensive advertising.
Date:
May 1, 2002
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Illustrated Paperboy (Cleveland, Tex.), Vol. 4, No. 5, Ed. 1 Wednesday, May 1, 1996
Weekly newspaper from Cleveland, Texas that includes local, county, and state news along with extensive advertising.
Date:
May 1, 1996
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Houston, Tex.), Vol. 41, No. 522, Ed. 1 Wednesday, December 1, 2010
Free weekly newspaper that includes business and classified advertising.
Date:
December 1, 2010
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Houston, Tex.), Vol. 44, No. 162, Ed. 1 Wednesday, May 1, 2013
Free weekly newspaper that includes business and classified advertising.
Date:
May 1, 2013
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Houston, Tex.), Vol. 43, No. 218, Ed. 1 Wednesday, August 1, 2012
Free weekly newspaper that includes business and classified advertising.
Date:
August 1, 2012
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Signal (Cleveland, Tex.), Vol. 1, No. 2, Ed. 1 Friday, August 1, 2003
Monthly newspaper from Cleveland, Texas that includes local, county, and state news along with extensive advertising.
Date:
August 1, 2003
Creator:
Johnson, Eugenia
Object Type:
Newspaper
System:
The Portal to Texas History
Illustrated Paperboy (Cleveland, Tex.), Vol. 6, No. 14, Ed. 1 Wednesday, July 1, 1998
Weekly newspaper from Cleveland, Texas that includes local, county, and state news along with extensive advertising.
Date:
July 1, 1998
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Signal (Cleveland, Tex.), Vol. 1, No. 1, Ed. 1 Tuesday, July 1, 2003
Monthly newspaper from Cleveland, Texas that includes local, county, and state news along with extensive advertising.
Date:
July 1, 2003
Creator:
Johnson, Eugenia
Object Type:
Newspaper
System:
The Portal to Texas History
A Metamodel-Based Approach to Model Validation for Nonlinear Finite Element Simulations
None
Date:
October 1, 2001
Creator:
Doebling, Scott W.; Hemez, Francois M.; Schultze, John F. & Cundy, Amanda L.
Object Type:
Article
System:
The UNT Digital Library
Use of response surface metamodels for damage identification of a simple nonlinear system.
The need for low order models capable of performing damage identification has become apparent in many structural dynamics applications where structural health monitoring and damage prognosis programs are implemented. These programs require that damage identification routines have low computational requirements and be reliable with some quantifiable degree of accuracy. Response surface metamodels (RSMs) are proposed to fill this need. Popular in the fields of chemical and industrial engineering, RSMs have only recently been applied in the field of structural dynamics and to date there have been no studies which fully demonstrate the potential of these methods. In this thesis, several RSMs are developed in order to demonstrate the potential of the methodology. They are shown to be robust to noise (experimental variability) and have success in solving the damage identification problem, both locating and quantifying damage with some degree of accuracy, for both linear and nonlinear systems. A very important characteristic of the RSMs developed in this thesis is that they require very little information about the system in order to generate relationships between damage indicators and measureable system responses for both linear and nonlinear structures. As such, the potential of these methods for damage identification has been demonstrated and …
Date:
January 1, 2003
Creator:
Cundy, A. L. (Amanda L.); Hemez, F. M. (François M.); Inman, D. J. & Park, G. H. (Gyu Hae)
Object Type:
Article
System:
The UNT Digital Library
A metamodel-based approach to model validation for nonlinear finite element simulations
Metamodeling, also known as response surface analysis, is the de facto standard for mathematical representation of complex phenomena in many fields, especially when first principles physical relationships are not well-defined, e.g. economics, climatology, and government policy. Metamodels provide a computationally efficient, low-dimension relationship for studying the behavior of a physical system. They can be used for understanding the physical system, predicting its response, optimizing its design or the parameters in a physical model, and performing verification and validation. Metamodels can be derived from simulation results or fit directly to observed test data. In structural dynamics, typical practice is to develop a first-principles-based model such as a finite element model to study the behavior of the system. However, it is common that the features of interest in a structural dynamics simulation are relatively low order (e.g. first few modal frequencies, peak acceleration at certain locations) and sensitive to relatively few model and simulation parameters. In these cases, metamodeling provides a convenient format to facilitate activities of model validation, including parameter screening, sensitivity analysis [3], uncertainty analysis, and test/analysis correlation. This paper describes the creation of metamodels, and presents some examples of how metamodels can be employed to facilitate model validation for …
Date:
January 1, 2001
Creator:
Doebling, S. W. (Scott W.); Hemez, F. M. (François M.); Schultze, J. F. (John F.) & Cundy, A. L. (Amanda L.)
Object Type:
Article
System:
The UNT Digital Library
Utility of Social Modeling in Assessment of a State’s Propensity for Nuclear Proliferation
This report is the third and final report out of a set of three reports documenting research for the U.S. Department of Energy (DOE) National Security Administration (NASA) Office of Nonproliferation Research and Development NA-22 Simulations, Algorithms, and Modeling program that investigates how social modeling can be used to improve proliferation assessment for informing nuclear security, policy, safeguards, design of nuclear systems and research decisions. Social modeling has not to have been used to any significant extent in a proliferation studies. This report focuses on the utility of social modeling as applied to the assessment of a State's propensity to develop a nuclear weapons program.
Date:
June 1, 2011
Creator:
Coles, Garill A.; Brothers, Alan J.; Whitney, Paul D.; Dalton, Angela C.; Olson, Jarrod; White, Amanda M. et al.
Object Type:
Report
System:
The UNT Digital Library
Evaluation of Life History Diversity, Habitat Connectivity, and Survival Benefits Associated with Habitat Restoration Actions in the Lower Columbia River and Estuary, Annual Report 2010
This report describes the 2010 research conducted under the U.S. Army Corps of Engineers (USACE) project EST-P-09-1, titled Evaluation of Life History Diversity, Habitat Connectivity, and Survival Benefits Associated with Habitat Restoration Actions in the Lower Columbia River and Estuary, and known as the 'Salmon Benefits' study. The primary goal of the study is to establish scientific methods to quantify habitat restoration benefits to listed salmon and trout in the lower Columbia River and estuary (LCRE) in three required areas: habitat connectivity, early life history diversity, and survival (Figure ES.1). The general study approach was to first evaluate the state of the science regarding the ability to quantify benefits to listed salmon and trout from habitat restoration actions in the LCRE in the 2009 project year, and then, if feasible, in subsequent project years to develop quantitative indices of habitat connectivity, early life history diversity, and survival. Based on the 2009 literature review, the following definitions are used in this study. Habitat connectivity is defined as a landscape descriptor concerning the ability of organisms to move among habitat patches, including the spatial arrangement of habitats (structural connectivity) and how the perception and behavior of salmon affect the potential for movement …
Date:
October 1, 2011
Creator:
Diefenderfer, Heida L.; Johnson, Gary E.; Sather, Nichole K.; Skalski, J. R.; Dawley, Earl M.; Coleman, Andre M. et al.
Object Type:
Report
System:
The UNT Digital Library
Levelland and Hockley County News-Press (Levelland, Tex.), Vol. 20, No. 1, Ed. 1 Wednesday, April 1, 1998
Semiweekly newspaper from Levelland, Texas that includes local, state, and national news along with advertising.
Date:
April 1, 1998
Creator:
Rigg, John
Object Type:
Newspaper
System:
The Portal to Texas History
Levelland and Hockley County News-Press (Levelland, Tex.), Vol. 21, No. 44, Ed. 1 Wednesday, September 1, 1999
Semiweekly newspaper from Levelland, Texas that includes local, state, and national news along with advertising.
Date:
September 1, 1999
Creator:
Rigg, John
Object Type:
Newspaper
System:
The Portal to Texas History
Levelland and Hockley County News-Press (Levelland, Tex.), Vol. 19, No. 54, Ed. 1 Wednesday, October 1, 1997
Semiweekly newspaper from Levelland, Texas that includes local, state, and national news along with advertising.
Date:
October 1, 1997
Creator:
Rigg, John
Object Type:
Newspaper
System:
The Portal to Texas History
Today Cedar Hill (Duncanville, Tex.), Vol. 38, No. 5, Ed. 1 Thursday, May 1, 2003
Weekly newspaper published in Duncanville, Texas that includes local Cedar Hill, state, and national news along with advertising.
Date:
May 1, 2003
Creator:
Gooch, Robin
Object Type:
Newspaper
System:
The Portal to Texas History
The West News (West, Tex.), Vol. 105, No. 22, Ed. 1 Thursday, June 1, 1995
Weekly newspaper from West, Texas that includes local, state, and national news along with advertising.
Date:
June 1, 1995
Creator:
Knapek, Larry
Object Type:
Newspaper
System:
The Portal to Texas History
Levelland and Hockley County News-Press (Levelland, Tex.), Vol. 17, No. 53, Ed. 1 Sunday, October 1, 1995
Semiweekly newspaper from Levelland, Texas that includes local, state, and national news along with advertising.
Date:
October 1, 1995
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History