Digital Commons Network^™

Stress And Strength Of Laminated Composite Containing A Circular Hole., Yi Zhao

LSU Historical Dissertations and Theses

This dissertation is to study the stress and strength of a finite laminated plate containing a circular hole subjected to tension. Efforts were made in three aspects: theoretical modeling, computer simulation using finite element method, and experimental evaluation using unidirectional and crossply Scotchply laminates. The stress concentration factor, normal stress distribution and tensile strength of laminates with various hole sizes and gage lengths were investigated. Theoretically, two models were proposed to describe the normal stress distribution of a laminate with finite width and finite length. By defining a width correction function and a size correction function, the normal stress in …

Down Upon The Fold: Mercenaries In The Twelfth Century., Steven Wayne Isaac

LSU Historical Dissertations and Theses

Despite the trend in recent medieval historiography which has accepted the presence of paid warriors as no longer an aberration, the role of the mercenary within and outside twelfth-century society has still escaped in-depth analysis. Such an approach, however, has the dual merit of building an understanding of the mercenary phenomenon itself and of highlighting the often overlooked social and cultural relations, structures, and breakdowns that produce men willing to fight for profit. The period 1187-1218 provides one of the earliest, richest backgrounds against which to examine the mercenary. The accelerating return of a money economy, hardening of feudal structures, …

An Analysis Of Factors Influencing The Teaching Of Biological Evolution In Louisiana Public Secondary Schools., Donald Wayne Aguillard

LSU Historical Dissertations and Theses

Louisiana public school biology teachers were surveyed to investigate their attitudes toward biological evolution. A mixed method investigation was employed using a questionnaire and open-ended interviews. Results obtained from 64 percent of the sample receiving the questionnaire indicate that although teachers endorse the study of evolution as important, instructional time allocated to evolution is disproportionate with its status as a unifying concept of science. Two variables, number of college courses specifically devoted to evolution and number of semester credit hours in biology, produced a significant correlation with emphasis placed on evolution. The data suggest that teachers' knowledge base emerged as …

Development Of A New Methodology For Particle Transport Calculations Utilizing Pointwise-Continuous Nuclear Data., Mehdi Asgari

LSU Historical Dissertations and Theses

The purpose of this study is to develop a new method to compute a continuous-energy representation of the neutron flux spectrum using the one-dimensional discrete ordinates method. The technique provides a rigorous calculational tool for applications that require a detailed description of the fine-structure variation in the space-dependent neutron energy spectrum over some energy ranges. This technique uses the combination of multigroup (MG) and rigorous pointwise (PW) solutions to the steady state Boltzmann transport equation in the calculations. Also utilized in this methodology are two new methods called "sub-moment" expansion and "cumulative integral" operator to accurately evaluate the Legendre moments …

M1 Strength Distributions In Deformed Nuclei., Thomas Georg Beuschel

LSU Historical Dissertations and Theses

The Elliott SU(3) Model, extended via pseudo-spin for heavy nuclei, is used to study low-lying magnetic dipole excitations in deformed nuclei which axe known as "scissors" modes. Proton and neutron degrees of freedom are handled explicitly and a system Hamiltonian that preserves SU(3) symmetry and one that includes single particle energies as well as quadrupole-quadrupole and pairing two-body interactions are considered. Starting from a basic nuclear Hamiltonian that preserves SU(3) symmetry, a microscopic interpretation of the "scissors" mode of the Two Rotor Model is realized through a linear mapping between invariants of the rotor group and SU(3). The model allows …

Pressure-Induced Changes In Structural And Mechanical Properties Of Gallium Arsenide And Nanophase Silicon Carbide Using Parallel Molecular Dynamics Simulations., Alok Chatterjee

LSU Historical Dissertations and Theses

Large-scale parallel molecular-dynamics (MD) simulations are performed to investigate properties and processes in nanophase silicon carbide (n-SiC) and gallium arsenide (GaAs) under pressure. These simulations involve 10 6 atoms interacting via realistic interatomic potentials. Structure and sintering of crystalline n-SiC are also investigated with neutron scattering experiments performed at the Intense Pulsed Neutron Source Division (IPNS), Argonne National Laboratory. Both MD simulations and neutron scattering experiments indicate the onset of sintering around 1500K. During sintering, the pores shrink in size while maintaining their morphology: Their fractal dimension remains ∼2.4 and their surface roughness exponent is ∼0.45. The pair distribution functions …

Spatial Variability Of Coastal Organic Soil Characteristics., L. Cecil Dharmasri

LSU Historical Dissertations and Theses

This dissertation is a part of the Louisiana NASA/EPSCoR (Experimental Program to Stimulate Competitive Research) global change research, which studied the fate of carbon and sediments within the Barataria Bay Basin, Louisiana. It studied water composition to assess seawater influence within the marsh. Ion exchange resin strips were used to study the effect of salinity and Chloride (Cl) on sulfate (SO4) reduction and their potential for water and soil analysis. Chloride dominated the water system and the Cl/SO 4 ratio can be used to assess the seawater influence. Resin extractable sulfur (S) predicted non-pyritic S fraction for the marsh soils. …

The Effects Of Autocorrelation In The Estimation Of Process Capability Indices., Lawrence Lee Magee

LSU Historical Dissertations and Theses

The current popularity of the process capability index, a measure of a supplier's ability to meet the product specifications demanded by a customer, has become a matter of some controversy. While admitting the validity of much existing criticism, this research demonstrates that sample estimation of the triple index (Cpl, Cp, Cpu), a variant of the widely used index pair (Cp, Cpk), is equivalent to estimation of the natural parameters (mu, sigma) whenever the measured process characteristic X has an unconditional (marginal) normal probability density function. This includes processes which obey the strictly stationary, normal ARMA( p, q) model. By this …

Thermomechanical Characterization Of Heat-Activated Coupling For Advanced Composite Piping Systems., Patrick Fitzgerald Mensah

LSU Historical Dissertations and Theses

A new technology for joining advanced composite piping systems, based on heat-activated coupling (HAC) of a thermosetting pre-impregnated (prepreg) fiber reinforced material has been advanced. The successful design of a heat-activated coupled joint depends on achieving the following requirements: (1) uniformly cured prepreg bonded to the surfaces of coupled pipe; and (2) minimal residual thermal stress as a result of the curing process. In order to address the above concerns, thermal characterization of the uncured and cured prepreg used was undertaken in order to establish prerequisite chemical kinetics parameters and material property data required for the curing process models and …

Placement Of Piezoelectric Actuators For Active Control Of Vibration Using Modal Parameters, Xuegeng Zhu

Mechanical & Aerospace Engineering Theses & Dissertations

An equation is derived to model the piezoelectric actuators incorporation with flexible structures. This equation permits the comparison of the performance indices over the entire structure for a piezoelectric actuator with constant area, which is unachievable if the Finite Element Method is used for complicated structures.

An index has been developed for placement of piezoelectric actuator for control of vibration of a flexible structure. This index is derived from the definition of H2norm. Computation of the proposed index requires only the natural frequencies and corresponding mode shapes of the structures of interest. The method is well suited to large …

A Hierarchical Filtering-Based Monitoring Architecture For Large-Scale Distributed Systems, Ehab Salem Al-Shaer

Computer Science Theses & Dissertations

On-line monitoring is essential for observing and improving the reliability and performance of large-scale distributed (LSD) systems. In an LSD environment, large numbers of events are generated by system components during their execution and interaction with external objects (e.g. users or processes). These events must be monitored to accurately determine the run-time behavior of an LSD system and to obtain status information that is required for debugging and steering applications. However, the manner in which events are generated in an LSD system is complex and represents a number of challenges for an on-line monitoring system. Correlated events axe generated concurrently …

Belted Work Machine, J. J. Burckhartzmeyer, E. R. Crabb, T. F. Lehnhoff, A. L. Watson Jr.

Mechanical and Aerospace Engineering Faculty Research & Creative Works

A heavy duty belt laying work machine includes a frame, a driver wheel mounted in supporting relation to the frame on each lateral side thereof, an idler wheel assembly disposed on each lateral side of the frame. The idler wheel assembly includes an idler wheel and a carry-roller, each of which is rotatably connected to an idler support arm that is pivotally mounted in supporting relation to the frame. A mid-roller is disposed on each lateral side of the frame between the driver wheel and the idler wheel assembly and rotatably connected to a mid-roller support arm mounted in supporting …

Cover And Contents

Turkish Journal of Biology

No abstract provided.

What’S This Work Coming To Anyway? A Look At Trends In Human Resources, American Institute Of Certified Public Accountants (Aicpa)

Guides, Handbooks and Manuals

No abstract provided.

Paradigms, Blindspots, And Real Life, American Institute Of Certified Public Accountants (Aicpa)

Guides, Handbooks and Manuals

No abstract provided.

Global Economic Forces: The Economic Forces Shaping The Future Of Our World, Gideon Malherbe

Guides, Handbooks and Manuals

No abstract provided.

Professor/Practitioner Case Development Program - 1998 Case Studies, American Institute Of Certified Public Accountants. Academic And Career Development Team

Guides, Handbooks and Manuals

No abstract provided.

Aerosol Particle Scavenging By Fog And Haze Droplets, Josef Podzimek

Physics Faculty Research & Creative Works

Droplet imprints in thin gelatin layers have been used for the investigation of coarse particles embedded in fog (haze) droplets in comparison to interstitial particles. Droplet samples were taken in less polluted regions of Missouri and Illinois and also in more polluted marine-urban environment in Italy. Considerable differences in particle size distribution and particle location inside the droplets have been found in samples collected on four sampling sites. The deduced relationships can be applied for the description of the aerosol scavenging process in fogs. The pollution of fog (haze) droplets may be related to the droplet mean volume radius and …

Understanding Business Valuation : A Practical Guide To Valuing Small To Medium-Sized Businesses, Gary R. Trugman

Guides, Handbooks and Manuals

No abstract provided.

Top 10 Technology Opportunities : Tips And Tools, Sandi Smith

Guides, Handbooks and Manuals

No abstract provided.

Cpa's Guide To Understanding Business Insurance, Nino Lama

Guides, Handbooks and Manuals

No abstract provided.

Complexities In Biomedical Decision-Making, George P. Smith Ii

Scholarly Articles

Within the contemporary debate over medical ethics, without question the most striking weakness found is the lack of a basic yardstick against which either the "rightness" or "wrongness" of a physician's actions may be measured. No general agreement is to be found among physicians or ethicists acknowledging what ethical determinant the physician should or should not follow in a particular case. Yet, despite this conflict of uncertainties, a framework for principled decisionmaking does exist and can be found within the rubric of medical ethics.

The Effect Of Tamoxifen On The Neonataldevelopment Of Rat Penis, Engin Deveci̇, Yusuf Nergi̇z, Serap İnalöz, Murat Akkuş, M. Aydın Ketani̇, A. Reşit Ersay

Turkish Journal of Medical Sciences

In rats penis development a seen two stages in prenatal life, the second stage is androgen hormone dependent chondrocyte and osteocyte differentiation period. To investigate Tamoxifane (Tx) administration on the developmental anomalies of penis. The newborn male rats were injected with 100 µg Tamoxifen subcutaneously from the day of birth to fifth day. This changes in Os penis and glans penis were investigated after the rats had been sacrificed and their penis were removed on the days 14.0, 21.0, 28.0, 35.0 and 60.0 Having been fixed in neutral formaline of 10%, the totally taken penis werembedded into paraffin blocks. The …

Cover And Contents

Turkish Journal of Medical Sciences

No abstract provided.

Association Of Hla Type With Pseudoexfoliationof The Lens Capsule, Hakkı Doğan, Türkan Patiroğlu, Engin Baykal, Kuddusi Erkiliç

Turkish Journal of Medical Sciences

Exfoliation of the lens capsule is asymptomatic but it is associated with the development of glaucoma and blindness if undetected and untreated. The occurrence of exfoliation varies widely in different countries where the population is ethnically homogeneous. It is suggested that both genetic and environmental influences are important in the development of exfoliative syndrome (ES). This study was carried out to determine if there was any relation between ES and HLA. HLA antigen types were determined in 45 patients with exfoliative syndrome. We found a strong association between HLA-A2, HLA-DR5, HLA B21 and HLA-DR7 and the existence of ES (Chi …

Helicobacter Pylori Seropositivity In Children Withrecurrent Abdominal Pain, Engin Günel, Duygu Findik, Fatma Çağlayan, Zerrin Topgaç

Turkish Journal of Medical Sciences

Recurrent abdominal pain (RAP) is a significant problem in pediatric patients, and there has been much recent interest in the role that Helicobacter pylori (Hp) might play in this disorder. The aim of the study was to determine the prevalance of Hp infection in children with RAP, and to determine whether there was an association between Hp and RAP. The study was conducted on 50 children with RAP and 20 asymptomatic children admitted for inguinal surgery as a control group. Serum samples from the 70 children were tested for anti-Hp Ig G and anti-Hp Ig A by ELISA. Of the …

Cpa's Guide To The Internet, John Graves, Kim Hill Torrence

Guides, Handbooks and Manuals

No abstract provided.

Cpa's Guide To Document Image Processing, John Graves, Jacqueline Justice, Marge Cataldo

Guides, Handbooks and Manuals

No abstract provided.

Cpa's Guide To Workflow Management, John Graves, Kimberly S. Hill, Lisa F. Allen

Guides, Handbooks and Manuals

No abstract provided.

The International Enforcement Of Software Copyrights And Patents, Siehnai F. Williamson

Computer Law Review and Technology Journal

Upon graduating with a computer science degree, Shannon Smith and her classmates started their own educational computer software firm called ABC Software (ABC). ABC observed that the computer software industry had grown exponentially since the 1980s due in part to industry-wide standards (like the Windows® platform) and the declining costs in computer hardware that have increased demand for computer products. Because ABC believes the software industry is knowledge-based, ABC need incur little research and developmental costs. ABC's ability to protect its software will be the determining factor in deciding where to distribute its products. Since the very nature of computer …