Digital Commons Network^™

Conservation And Ecology Of Fringing Salt Marshes Along The Southern Maine/New Hampshire Coast, Pamela Ann Morgan

Doctoral Dissertations

The small, fringing salt marshes that line the edges of estuaries in southern Maine and New Hampshire were the focus of this research. Although larger meadow marshes in New England have been studied extensively, little is known about the ecology of fringing marshes. Not only are fringing marshes much more numerous than meadow marshes in northern New England, they are often restored or created as mitigation for marsh impacts. Five ecological functions (primary production, soil organic matter accumulation, sediment trapping and binding, wave dampening and maintenance of plant diversity) were compared in meadow marsh and fringing marsh sites, and sometimes …

Number, Please: New Hampshire Telephone Operators In The Predial Era, 1877--1973, Judith N. Moyer

Doctoral Dissertations

The predial telephone era in New Hampshire stretched from about 1877 to 1973. This dissertation examines predial telephone operating in the state as a category of women's work. While growing out of and responding to technical invention and development, telephone operating had deep roots in women's social roles; gender defined occupational options, the work environment, the rules of employment, wages, and expectations. As the telephone system developed, differences between telephone operating in large and small exchanges developed; the urban operator eventually worked under conditions of traffic volume, supervision, and control that the rural operator often did not. To uncover the …

Mathematics And Socio -Cultural Behavior: A Case Study Of The Enculturation Of A New Mathematician, Timothy Byron Gutmann

Doctoral Dissertations

Research has shown that mathematics as we know it is a product of the socio-cultural climate in which it was developed. This research attempts to address the related question of how being involved in mathematics influences the socio-cultural lives of mathematicians. A new Ph.D. mathematician hired in his first faculty position was observed for a period of 13 weeks, most during his first semester. Analysis of this long-term, in depth case study followed ethnographic methods and drew on theories of rites of passage, organizational socialization, self-identity, and evolution. The role of mathematics in the departmental culture and in the newcomer's …

Disturbance Indicators For Time Series Reconstruction And Marine Ecosystem Health Impact Assessment, Benjamin Harrison Sherman

Doctoral Dissertations

A systematic reconstruction of Multiple Marine Ecological Disturbances (MMEDs) involving disease occurrence, morbidity and mortality events has been undertaken so that a taxonomy of globally distributed marine disturbance types can be better quantified and common forcing factors identified. Combined disturbance data include indices of morbidity, mortality and disease events affecting humans, marine invertebrates, flora and wildlife populations. In the search for the best disturbance indicators of ecosystem change, the unifying solution for joining data from disparate fields is to organize data into space/time/topic hierarchies that permit convergence of data due to shared and appropriate scaling. The scale of the data …

Impacts Of Wildlife Viewing: A Case Study Of Dixville Notch Wildlife Viewing Area, Judith Kay Anderson Silverberg

Doctoral Dissertations

Major objectives of this study were to examine the motivations, knowledge level and attitudes of wildlife viewers as well as the response of moose to observation and other human caused stimuli at a designated wildlife viewing site. Moose and other wildlife are attracted to areas where road salt runoffs and pools in low areas around culverts and ditches creating wildlife viewing opportunities.

This study examined whether moose behaviors such as visitation time and rate of use of the salt lick changed from preconstruction (1996) of a wildlife blind to wildlife viewing establishment (1999). Trailmaster monitors strategically located on trails entering …

Soil Hydraulic Controls Over Nitrogen Oxide Emissions And Nitrogen Cycling In Tropical Agriculture, Antje M. Weitz

Doctoral Dissertations

Soils are the major natural source of nitrous oxide (N2O). Intensive land use increased atmospheric concentrations of this greenhouse gas. Soil microbes produce and consume nitrogen oxides (NO, N2O) during the processes of nitrification (aerobic) and denitrification (anaerobic). Micro-scale variability of controlling factors cause nitrification and denitrification to occur simultaneously in soils, resulting in high spatial variability of nitrogen oxide emissions. Fertilization increases nutrient availability and thus N2O fluxes. Forest soils in the humid tropics account for 20--50% of all N2O sources. Expansion and intensification of tropical agriculture is expected to increase atmospheric N2O concentrations.

We measured N2O fluxes from …

Changing And Choosing Together: A Case Study On Improving Professional Development And Student Achievement Through A Teacher-Initiated Early Literacy Program, Theresa Connor Molinelli

Doctoral Dissertations

The purpose of this study was to ascertain teacher's perceptions of the success of an early literacy professional development program designed to achieve more meaningful student assessment, facilitate observation of effective teaching practices, promote teacher-centered staff development, and encourage greater teacher collaboration. This research study also examined the extent to which teachers believed that school- and district-administrative support for this program benefited their classroom teaching practices.

The Relationship Among Knowledge Of, Attitudes Toward, And Use Of Portfolios For Assessment By Teacher Education Professors, Naomi C. Coyle

Doctoral Dissertations

The major purpose of this study was to examine the evaluation of portfolios as an alternative assessment tool along with those factors which influence the implementation practices of portfolios by faculty in colleges of education. The specific goals of this study were to determine the relationship between college and university professors' knowledge of portfolio assessment and their attitudes toward using portfolios as an alternative to traditional assessment practices, as well as college and university professors' knowledge of portfolio assessment and use of portfolios in the courses that they teach, and professors' attitudes and use of portfolios. Other areas of investigation …

A Thin-Film Micromanufactured Oxygen Microelectrode, James Clay Mcguyer Jr.

Doctoral Dissertations

The methods for production of recessed oxygen microelectrodes developed by Whalen, et al. (1967) and improved upon by Linsenmeier, et al. (1987) are dated production methods by the standards of sensor production of the current time. The production process for this type of polarographic oxygen sensing electrode has remained unchanged for over 10 years, and is a time consuming, extremely low-yield process. The goal of this project has been to use the techniques of micromanufacturing available at the Institute for Micromanufacturing at Louisiana Tech University to construct a recessed oxygen microelectrode with a batch process that has higher yield than …

The Microchannel Flow Of A Micropolar Fluid, Guohua Liu

Doctoral Dissertations

Micro-channel flows have been computed to investigate the influence of Navier-Stokes formulation for the slip-flow boundary condition, and a micro-polar fluid model, respectively.

The results of the slip boundary condition show that the current methodology is valid for slip-flow regime (i.e., for values of Knudsen number less than approximately 0.1). Drag reduction phenomena apparent in some micro-channels can be explained by slip-flow theory. These results are in agreement with some computations and experiments.

An ad hoc micro-polar fluid model is developed to investigate the influence of micro effects, such as micro-gyration, in micro-scale flows. The foundation of the ad hoc …

Observable Outcomes And Performance Effects Of The Application Of Theory Of Constraints To Organizational Management, Martha Lair Sale

Doctoral Dissertations

The objectives of the study were to empirically examine the relationships among the three elements of the Theory of Constraints (TOC), a number of observable outcomes expected to be associated with application of TOC, and business unit performance. Measures were developed for each of the elements of TOC and a number of observable outcomes (OUTCOMES) expected to be associated with practice of TOC. TOC is defined as consisting of scheduling logistics (LOGISTICS), the Thinking Process (THINKING), and non-traditional performance measures (MEASURES). A previously developed and widely used measure of business unit performance (PERFORMANCE) was employed.

The sampling frame for this …

The Fundamental And Non-Fundamental Components Of Stock Prices: The Role Of Time-Varying Expected Inflation, Maosen Zhong

Doctoral Dissertations

I derive testable implications of fundamental and non-fundamental components of stock prices. In order to control for the role of time-varying expected inflation and to be able to perform reasonable empirical tests, I use a nominal (rather than a real) interpretation of the present-value model (PVM), whereby nominal interest rates approximate expected inflation. I conjecture that the fundamental and non-fundamental components represent the permanent and temporary components of stock prices, respectively. A series of cointegration analysis over the annual period 1871–1997 confirms my conjecture for the model with time-varying expected inflation. Various fundamental and non-fundamental exclusion tests indicate that both …

Environmental Behavior Of Hafnium: The Impact On The Disposition Of Weapons-Grade Plutonium, Gary S. Cerefice '89

Doctoral Dissertations

Experimental and analytical studies were performed to examine the environmental behavior of hafnium and its utility as a neutron poison for the disposition of weapons-grade plutonium in Yucca Mountain. The hydrolysis of hafnium was investigated by potentiometric titration in solutions of varying ionic strength to determine the stability constants for the first four monomeric hydrolysis products. The specific ion interaction theory is used to extrapolate these results to infinite dilution. The solubility of hafnium hydroxide and a meta-stable hafnium carbonate solid phase are studied via solubility experiments using ICP-AES. An upper bound for the stability constant of the first carbonate …

Finite Element Simulation Of Creep Buckling Of Cipp Liners Under External Pressure, Qiang Zhao

Doctoral Dissertations

The problem of long-term structural behavior of CIPP liners under external hydrostatic pressure has been characterized as a structural instability problem which is induced by time-dependent material deformation or creep. It is also a contact problem since the liner deflection is externally constrained by the host pipe. The intrinsically nonlinear problem is investigated by means of finite element simulation, with emphases on (a) the essential structural behaviors and mechanisms of buckling, and (b) the influences of inelastic material properties (i.e. yield strengths and creep rates) and geometrical parameters on liner's buckling resistance.

A liner first deforms as a free pipe …

Cracking In Cycloaliphatic Epoxy/Aluminum Composite Electrical Bushings, Keith Alan Parker

Doctoral Dissertations

The problem of cracking in electrical apparatus bushings as a result of thermal stresses was investigated. The bushings were composed of cycloaliphatic epoxy insulators with embedded aluminum conductors. The problem is due to the difference in coefficients of thermal expansion of the two materials. A solution to the problem had been to coat the conductors before they were formed together with the epoxy insulators. The coating was assumed to prevent cracking by allowing movement between the two materials as their dimensions changed during thermal expansion and contraction. The contribution of the coating was to be established.

The hypothesis was that …

A Systematic Integration Of Register Allocation And Instruction Scheduling, Yukong Zhang

Doctoral Dissertations

In order to achieve high performance, processor architecture has become more and more complicated. As a result, compiler-time optimizations have become more and more important for the effective use of a complex processor. One of the promising compiler-time optimizations is the integration of register allocation and instruction scheduling based on register-reuse chains. In the previous approach, however, the generation of register-reuse chains was not completely systematic and consequently created many unnecessary dependencies that restrict instruction scheduling.

This research proposes a new register allocation technique based on a systematic generation of register-reuse chains. The first phase of the proposed technique is …

Graphical Display And Data Structure For Virtual Prototyping, David William Manry

Doctoral Dissertations

One of the goals of engineering firms is to bring better products to market faster. Although concurrent engineering can aid in this endeavor, it requires that all areas of an organization work simultaneously. Thus, current product data must be accessible to everyone.

Virtual prototyping allows this simultaneous exchange of information. Virtual prototyping not only replaces the physical model in product development with a virtual model, but also it goes further by allowing data associated with each part of the model to be accessed. This data is not limited to just geometric properties but could contain other quantifiable properties, such as …

The Dynamics Of Cyberspace: Examining And Modelling Online Social Structure, Brian S. Butler '89

Doctoral Dissertations

It has been proposed that online social structures represent new forms of organizing which are fundamentally different from traditional social structures. However, while there is a growing body of empirical research that considers behavioral aspects of online activity, research on online social structure structural remains largely anecdotal. This work consists of three papers that combine previous studies of traditional social structures, empirical analysis of longitudinal data from a sample of Internet listservs, and computational modeling to examine the dynamics of social structure development in networked environments.

The first paper (Title: When is a Group not a Group: An Empirical Examination …

Sonar Three-Dimensional Image Formation For Underwater Vehicular Collision Avoidance, Gary Robert Boucher

Doctoral Dissertations

The last ten years have shown a marked increase in research into Autonomous Underwater Vehicles. A key component of this research is the ability to “look” ahead of the vehicle's projected path and translate active sonar returns into three-dimensional (3-D) computer data structures used to navigate and avoid obstacles. This need to avoid obstacles is also common to other underwater vehicles including submersibles.

Of special interest to this research is the “Occupancy Grid Framework.” This technique divides the forward looking sonar field into cells. These cells can be maintained either in spherical or cartesian coordinate systems.

This research demonstrates a …

Organizational Dynamics: Issues And Implications From The Complexity Sciences, Kenneth Michael Mathews

Doctoral Dissertations

Organizational change, both developmental and transformational, is an issue of central and enduring concern in the organizational sciences. However, the processes, mechanisms and sequencing of events that describe how and why social systems change have not been satisfactorily explicated at a theoretical level and constitutes one of the major challenges facing the social sciences. This research examines issues and implications from an emerging perspective—the complexity sciences—developed to explain the mechanisms and processes of change in physical and natural systems. The purpose is to develop a theoretical approach to the study of change in social organization that integrates these implications, while …

The Effect Of Physical And Biological Site Characteristics On The Survival And Expansion Of Transplanted Eelgrass (Zostera Marina L), Ryan Clark Davis

Doctoral Dissertations

Eelgrass (Zostera marina L.) was transplanted at seven sites along the New Hampshire side of the Piscataqua River in 1993 and 1994. The eelgrass transplanting was one component of the New Hampshire Port Authority Mitigation Project, designed to mitigate for impacts to natural resources associated with the expansion of the port facility. Over 2.5 hectares of eelgrass were transplanted using a newly developed transplanting technique, the horizontal rhizome method, and ultimately created eelgrass habitat at several sites. However, transplants did not survive at any of the intertidal areas planted and were greatly reduced at several subtidal sites. The intertidal transplants …

The Long-Term Effects Of Disturbance On Nitrogen Cycling And Loss In The White Mountains, New Hampshire, Christine Lynn Goodale

Doctoral Dissertations

Theories of nitrogen retention suggest that N cycling and loss should increase with ecosystem successional age and with chronic N deposition over time (N saturation). These factors both affect northeastern U.S. forests, most of which receive elevated rates of N deposition and have experienced past disturbances by wind, logging, fire, or agriculture. This work examined the long-term (80--110 year) effects of land-use history on nitrogen cycling and loss in the White Mountains, New Hampshire. Historical land-use maps were used to identify a network of watersheds and plots containing burned, logged, or old-growth forests. Nitrate-N fluxes from old-growth watersheds exceeded those …

Ordinary Women: Government And Custom In The Lives Of New Hampshire Women, 1690-1770, Marcia Schmidt Blaine

Doctoral Dissertations

The prominence of patriarchy and common law has caused many historians to concentrate on the limitations placed on eighteenth-century Anglo-American women. The results often present women as objects, rather than subjects, of study. Using four major primary sources: Governor, Council and Assembly records, petitions, licensing materials, and treasury records, this study examines the relationship between ordinary women and the provincial government of New Hampshire in order to explain the customary options available to women in proceedings with the government. Even with a spouse still living, Anglo-American women acted as family agents and representatives when captured by the Native Americans and …

Three-Dimensional Imaging Of Turbulent Flows: Optical Tomography With Proper Orthogonal Decomposition, Barbara Jeanne Pelliccia

Doctoral Dissertations

Fluid flows with turbulent characteristics are evident in many important engineering and scientific applications. For years researchers have investigated fluid flow turbulence but have not attained a complete physical understanding and quantitative description of the turbulent fluid motion. One approach has been to identify and classify the organized, or coherent, structures imbedded in the turbulence. Research in this area has been restricted by the lack of complete three-dimensional descriptions of the flow. In many studies, the velocity field is measured in either one or two dimensions using mechanical probes which can disrupt the downstream evolution of the flow and offer …

An In Situ Measurement Of Charged Mesopheric Dust During A Sporadic Atom Layer Event, Lynette Jean Gelinas

Doctoral Dissertations

In this thesis we discuss the results of the Sudden Atom Layers (SAL) sounding rocket, launched from Puerto Rico the evening of February 19, 1998, as part of the Coqui II sounding rocket campaign. A charged dust detector was constructed and flown on the Sudden Atom Layers (SAL) sounding rocket. The existence of charged dust population has implications for many upper atmospheric processes, including the formation of sporadic atom layers (Na s), thin layers of neutral atomic metal which form in the Earth's mesosphere. In particular we focus on the interesting results from the charged dust experiment and the electric …

Functional Characterization Of The Ccr4-Not Transcriptional Regulatory Complex, Vasudeo Badarinarayana

Doctoral Dissertations

The CCR4-NOT transcriptional regulatory complex affects expression of a number of genes both positively and negatively. This study demonstrates that the CCR4-NOT complex functionally and physically interacts with TBP and TAFs. Firstly, mutations in CCR4, NOT4, and NOT5 suppressed the his4-912 delta insertion by a mechanism similar to that observed for the defective TBP allele spt15-122. This mechanism appeared to involve stabilization of TBP binding to a specific non-consensus TATA sequence, CATAAA, in the his4-912 delta element. Secondly, using modified HIS3 promoter derivatives containing specific mutations within the TATA sequence, it was found that the NOT proteins were general repressors …

Unbound Pavement Base Courses: Parallel Study Of Stiffness And Drainage Characteristics, Moussa Issa

Doctoral Dissertations

The purpose of this project was to study the effects of fines (minus #4 sieve) on permeability and stiffness characteristics of unbound base materials and to propose an optimumgradation that will satisfy these two parameters. One type of highway base material--crushed limestone--was used in the study. A total of 75 laboratory tests were conducted and distributed--25 respectively on permeability, resilient modulus and unconfined compression. The permeability test data were collected using a low-head permeameter. The resilient modulus and unconfined compression test data were collected by the mean of the MTS (Machine Testing System) with a load cell capacity of 22-kips. …

Controls On Spatial And Temporal Variability In Nitrous Oxide Fluxes Across A Tropical Rainforest Ecosystem In The Luquillo Experimental Forest, Puerto Rico, Claire Patricia Mcswiney

Doctoral Dissertations

Nitrous oxide (N2O) is a trace gas that contributes to the greenhouse effect and participates in the reactions that destroy stratospheric ozone. Soil microbial processes are significant producers of this trace gas, particularly in tropical areas, which are considered major sources in the global N2O budget. Nitrous oxide fluxes to the atmosphere are variable in space and time. In this study, spatial and temporal variability in surface N2O fluxes were assessed as well as the major environmental controls on N2O production for a tropical rainforest watershed in northeastern Puerto Rico. A static chamber technique was used to assess surface fluxes …

Paleoclimatic Significance Of Insoluble Microparticle Records From Canadian Arctic And Greenland Ice Cores, Christian Michel Zdanowicz

Doctoral Dissertations

The past and present variability of climate in the Arctic region is investigated using ice core records of atmospheric dust (microparticles) and volcanic aerosols developed from the Canadian Arctic and Greenland. A high-resolution, 10 4-year long proxy record of atmospheric dust deposition is developed from an ice core (P95) drilled through the Penny Ice Cap, Baffin Island. Snowpit studies indicate that dust deposited on the Penny Ice Cap are representative of background mineral aerosol, and demonstrate that the variability of dust fallout is preserved in the P95 core at multi-annual to longer time scales. The P95 dust record reveals a …

At The Heart Of It: Middle School Writers Use Talk And Multimedia Journals To Forge A Literate Classroom Community, Julie A. Pantano

Doctoral Dissertations

In this research study, I investigated how middle school writers use talk and multi-media journals to forge a literate classroom community. Talk and multi-media journals helped middle school writers to construct and maintain a safe, caring, supportive, and respectful learning environment where transformative literacy and learning experiences could take place.

Classroom talk played a vital role in improving students' relationships in this literate classroom community and engaging them in meaningful ways with their multi-media journals. During the research study, explicit instruction in the social aspects of talk emerged as important as explicit instruction in language arts content.

The multi-media approach …