Mountain Scholar

Mountain Scholar is an open access repository service that collects, preserves, and provides access to digitized library collections and other scholarly and creative works from Colorado State University and the University Press of Colorado. It also serves as a dark archive for the Open Textbook Library.

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Colorado State University, Fort Collins 27623
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Open Textbook Library Archive 25
A limited number of titles are available here. To see all OTL titles, please visit the Open Textbook Library at https://open.umn.edu/opentextbooks. Only Open Textbook Library staff have access to all OTL Archive titles held in Mountain Scholar.
University Press of Colorado 1088
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Recent Submissions

Access status: Open Access ,
Loss analysis and loss based seismic design for woodframe structures
(2007) Pei, Shiling, author; van de Lindt, John W., advisor; Criswell, Marvin E., committee member; Heyliger, Paul R., committee member; Hoeting, Jennifer A., committee member
Light frame wood structures serve as the vast majority of construction type for residential structures throughout North America. This type of structure utilizes mainly wood shearwalls and a joist-sheathing floor system to resist the live and dead loads. Compared to concrete and steel structures, light frame wood structures typically have a relatively low construction cost, i.e. overall value. However, recent earthquake surveys and studies revealed that the costs involved in repairing these structures after earthquakes can be quite significant even when the structure survives the event without collapse. As a result of the large stock of residential construction in the U.S., earthquake-induced losses for this type of structure could have a detrimental financial impact on both the building owner and the community as a whole. During the 1994 Northridge earthquake in California, the economic loss directly connected with residential wood structures was more than $20 billion, and provides the impetus for this study. The limitation of current woodframe structural design philosophy is that it focuses only on life safety and does not address providing damage-limitations. The idea that financial losses for a structure during an earthquake should be addressed during the design stage leads to loss-based seismic design, which falls under a more comprehensive framework, performance-based seismic design (PBSD). The objective of this study is twofold. The first objective is to develop a method to establish a probabilistic model for earthquake-induced loss of existing or newly designed wood frame structures for a given period of time into the future; then this method is to be incorporated into a performance-based seismic design framework to conduct loss-based design/optimization for wood frame structures. The first objective involves the modeling of the structural behavior during earthquake loading, financial loss estimation of the structures, and probabilistic modeling/simulation of the seismic hazard. An improved non-linear structural model for light frame wood structures was proposed and used in the structural analysis. A vulnerability based loss estimation framework was developed to incorporate multiple uncertainty sources which contribute to financial losses. Bayesian techniques were used in the modeling of the framework elements in order to include as much usable information as possible. An alternative loss estimation procedure based on Monte-Carlo simulation was also proposed with the ability to consider more realistic situations such as damage accumulation and structural degradation. The results of the long-term earthquake-induced loss were obtained in the form of simulated sample pools conditional on time span. Based on the results from the first objective, simplified loss estimation in the design stage was introduced in order to obtain the vulnerability target for loss-based optimization. This optimization procedure was later used to implement loss-based design in the numerical examples. The most significant anticipated contribution of this study to the woodframe design and research communities will be the development of a long-term seismic induced loss estimation framework/procedure for woodframe structures that enables loss-based design and evaluations. Although this procedure will only be applied to woodframe structures in this dissertation, the general solution can also be used to analyze other structure types provided the necessary details are addressed. The automated analysis package developed in this study will essentially be a practical implementation of the performance-based seismic design (PBSD) concept for most commonly constructed residential structures (in North America). Other contributions will include a new formulation for the hysteretic models for wood shearwalls, a performance-based seismic design procedure for woodframe residential buildings, and a generalized user-friendly woodframe building seismic analysis tool package for the research community.
Access status: Open Access ,
The role of developmental experience in the career development of fire chiefs in the United States
(2007) Jones, Warren D., author; Feller, Richard, advisor; Grosse, Larry, advisor; Banning, James, committee member; Littrell, John, committee member
This study examined the career experiences of fire chiefs. It goes beyond an examination of the traditional technical competencies and time in position elements of a fire chief's career development by focusing on specific experiences that produced change in their leadership and management behaviors. These are called developmental experiences. The audience for this study is fire chiefs, those that aspire to this position and other fire service professionals seeking to better understand the career development of fire chiefs. The research approach used was qualitative and the methodology was multiple case study using narrative analysis technique. Developmental experience has emerged as an experiential learning strategy that improves a leader's ability to adapt to and positively influence organizational success under conditions of change. The literature indicates that positive changes in leadership and management behaviors derived from developmental experience come from challenging on-the-job experiences, which result in personal learning and changes in leadership and management behaviors. The results of this study indicate that the 14 participants described nine common themes that met the definition of developmental experience in accordance with the Center for Creative Leadership developmental experience model. The participants furthermore described 26 examples of personal learning in seven developmental experience themes and 23 examples of changes in leadership and management behavior in four developmental experience themes. Two developmental experience themes, (1) the first fire chief and (2) hardship produced the strongest learning and change in leadership and management behaviors. The results of this study challenge the conventional fire service career development systems in place today. It recommends that (1) developmental experience opportunities be made available to fire service personnel much earlier in their careers, especially for those who display leadership talent; (2) that more focus be placed on leadership and management experience in the early career; (3) that learning from hardship be incorporated into leadership development; and (4) that more opportunities be provided to learn political skills outside the confines of the internally focused fire service world.
Access status: Open Access ,
The dual roles of DNA-PKcs, NBS1, and TRF2 proteins in DNA repair and telomere end-capping
(2007) Williams, Eli Stowe, author; Ullrich, Robert L., advisor; Bailey, Susan M., committee member; Bedford, Joel S., committee member; Cornforth, Michael N., committee member; Ranu, Rajinder S., committee member
Telomeres are the nucleoprotein structures located at the ends of linear chromosomes that distinguish naturally occurring chromosome ends from DNA double-strand breaks (DSBs). The ability to properly distinguish telomeres as such is critical to long term cellular survival as failure to do so can result in genomic instability and favor the progression towards cancer, cellular senescence or apoptosis. Cells unable to efficiently cap their chromosome ends are recognized cytogenetically as dicentric chromosomes which maintain telomere sequence at the point of fusion (telomere fusions). It has been shown that deficiencies in Telomere Repeat Binding Factor 2 (TRF2), a telomere binding protein, results in massive telomere dysfunction characterized by high numbers of telomere fusions, thus establishing TRF2 as an essential telomere end-capping protein. Surprisingly, TRF2 is rapidly and abundantly recruited to laser microbeam-induced damage, implicating this telomere protein in the early cellular response to DNA damage. We demonstrate that TRF2 is, in fact, not recruited to localized IR- or UV-induced DNA damage, arguing against a role for TRF2 in the DNA damage response, as well as illustrating important differences between damage produced by laser microbeams, as compared to other types of radiation. An abundance of evidence, however, confirms significant overlap between DNA repair proteins and telomeres. Most strikingly, deficiencies of key proteins involved in the cellular response to DNA damage, particularly the catalytic subunit of the DNA dependent protein kinase (DNA-PKcs), also lead to the formation of telomere fusions, suggesting a role for these proteins in telomere end-capping. We show here that auto-phosphorylation of DNA-PKcs is critical for its function at telomeres, as well as establish the utility of the BALB/c mouse in investigating the contribution of telomere dysfunction in driving genomic instability. NBS1, a homologous recombination (HR) protein critical in the cell's initial response to damage, has also been implicated in telomere end-capping. We demonstrate that cells depleted of NBS1 show an increase in telomere associations. Overall, this study helps to further clarify the complex interplay between DNA repair proteins and telomeres.
Access status: Open Access ,
Evaluation and characterization of tuberculosis serodiagnostic biomarkers
(2007) Sartain, Mark Jonathan, author; Belisle, John T., advisor; Curthoys, Norman P., committee member; Reardon, Kenneth F., committee member; Schweizer, Herbert P., committee member; Slayden, Richard A., committee member
Detection of the antibody response has the potential to provide early and sensitive diagnosis of infection and disease, a critical element of tuberculosis control. The objective of this study was to discover and evaluate Mycobacterium tuberculosis antigens with protein microarray technology. Techniques were established for separation of native M. tuberculosis cytosol and culture filtrate proteins, resulting in 960 protein fractions that were used to generate protein microarrays. Evaluation of serological reactivity from 42 patients in three tuberculosis disease states and healthy purified-protein-derivative positive individuals demonstrated distinct reactivity profiles. Identification of antigens within the reactive fractions yielded eleven products recognized by both cavitary and noncavitary TB patients, and four proteins (HspX, MPT64, PstS1, and TrxC) specific to cavitary tuberculosis patients. Moreover, this approach identified four novel B cell antigens (BfrB, LppZ, SodC, and TrxC) of human tuberculosis, and the seroreactivity of these antigens was validated with more conventional techniques. SodC is one of two superoxide dismutases produced by M. tuberculosis and was previously shown to contribute to virulence. SodC is also a putative lipoprotein and like other sec-translocated mycobacterial proteins it was suggested to be modified with glycosyl residues. The objective of this study was to define the sites and extent of SodC glycosylation. An approach was developed that combined site-directed mutagenesis, lectin binding, and mass spectrometry. Six O-glycosylated residues within a 13 amino acid region were identified near the N-terminus. Each residue was modified with one to three hexosyl units, and the most dominant SodC glycoform was modified with nine hexosyl units. In addition to O-glycosylation of threonine residues, this study provides the first evidence of serine O-glycosylation in mycobacteria. When combined with bioinformatic analyses, the clustering of Oglycosylation appeared to occur in a region of SodC with a disordered structure and not in regions important to the enzymatic activity of SodC. The use of recombinant amino acid substitutions to alter glycosylation sites provided further evidence that glycosylation influences proteolytic processing and ultimately positioning of cell wall proteins.
Access status: Open Access ,
Estimating overland flow soil transport capacity and surface erosion rate using unit stream power
(2007) Shih, Hui-Ming, author; Yang, Chih Ted, advisor; Watson, Chester C., committee member; Wohl, Ellen E., committee member; Julien, Pierre Y., committee member
The unit stream power was used to develop a physically-based model to estimate overland flow soil transport capacities and corresponding surface erosion rates in the study. This model considers the impact that physical factors have on computed overland soil transport capacities including varying hydraulic conditions and a maximum sediment concentration limit. This new soil transport capacity relationship, which is developed in this study, was incorporated in the CASC2D-SED watershed model. The revised CASC2D-SED model was applied to eight basins in three different watersheds to validate the overland flow soil transport capacity relationship and provide a practical tool for water and soil conservation management. In past studies of event-based overland flow soil erosion, both empirical and physically-based approaches have been used to define soil transport capacity relationships and corresponding erosion rates. However, these previous relationships only provide a description of the factors that influence transport capacity based on site-specific data sets that considered only a limited range of conditions. In contrast, the overland soil transport capacity relationship developed as part of this study provides a more complete description of the factors that determine transport capacity. A correlation analysis was used to determine the significant factors that impact transport capacity. The correlation analysis results show that unit stream power is the most dominant factor for soil transport. A bounded regression formula was used to reflect the limits that transported sediment concentrations cannot be less than zero or greater than a maximum value. The coefficients used in this new model were determined from nonlinear regressions using published experiment measurements. A one-dimensional overland flow diffusive wave model was used in conjunction with the new soil transport capacity equation to simulate field conditions and validate the model. The computed results were in good agreement with laboratory and field plot data. To further validate the performance of the new overland soil transport equation and to provide a practical tool for watershed-scale application, the new equation was incorporated into a revised CASC2D-SED watershed model. Unlike the Kilinc-Richardson equation originally used in CASC2D-SED, the crop management factor (C) of Universal Soil Loss Equation is not required as a model input because unit stream power and other physical factors in the transport capacity equation can reflect the effects of dynamic flow resistance. Eight basins in three different watersheds were used to validate the revised CASC2D-SED model. Sensitivity analyses show that overland roughness using the Manning coefficient is more sensitive for sediment yield calculations than it is for hydrology simulations. By comparing with observed data, the variation range of predicted results is considered acceptable using the revised model.