Titanium-doped sapphire laser research and design study

Three main topics were considered in this study: the fundamental laser parameters of titanium-doped sapphire, characterization of commercially grown material, and design of a tunable, narrow-linewidth laser. Fundamental parameters investigated included the gain cross section, upper-state lifetime as a function of temperature and the surface-damage threshold. Commercial material was found to vary widely in the level of absorption of the laser wavelength with the highest absorption in Czochralski-grown crystals. Several Yi:sapphire lasers were constructed, including a multimode laser with greater than 50mJ of output energy and a single-transverse-mode ring laser, whose spectral and temporal characteristics were completely characterized. A design for a narrow-linewidth (single-frequency) Ti:sapphire laser was developed, based on the results of the experimental work. The design involves the use of a single-frequency, quasi-cw master oscillator, employed as an injection source for a pulsed ring laser

Restoring Identity and Bringing Balance through Navajo Healing Rituals

The primary focus of the ceremonies of the Native American Navajo tribe is to bring balance by re-establishing harmony or hózhó. This article proposes that significant psychological and emotional benefits result from the identity affirmation that occurs in these ceremonies. The ceremonies recalibrate patients regarding social and supernatural relationships, and their attachment to place and time, in what the author calls cosmographic orientation. The Enemyway ceremony is the primary focus of the article

Grandfather Tales of Scarborough

Grandfather Tales of Scarborough by Augustus F. Moulton Foreword by John Clair Minot Katahdin Publishing Company, Augusta, Maine, 1925. Printed in Maine on Maine-Made Paper, LEWISTON JOURNAL PRESS Contents: My Grandfather / The Fabyans and the Millikens / The Stuart Brook / Ezra Carter Homestead / Roads and Highways / The Movement for Better Highways / Dunstan of the Alger Settlement / The Scarboro Marshes and the Dyke / The Rivers and the Old Seaport / The Shipping and the Shipyard / The King Family and Resident People / Old Dunstan Corner / Old Times in the Vicinity / Taverns and Stage Coaches / Over the River District / Charles Pine and the Pioneer Settlers / Random Grandfather Tales / The Indian Wars and Garrison Houses / Black Point and Prouts Neck / The Prouts Neck Title / The Churches and Parishes / How the Old Orthodox Church Became Unpopular / Schools and Educational System / Social Customs and Neighborhood Affairs / The Proprietors of Scarborough / Individual Ownership of Land in America / Three Scarboro Womenhttps://digitalcommons.usm.maine.edu/me_collection/1132/thumbnail.jp

Arctic Thaw: Environmental Exploitation for Economic Profit

“Arctic Thaw: Environmental Exploitation for Economic Profit,” is a comprehensive, interdisciplinary assessment of Arctic climate change (CC) impacts. Arctic CC alters the regions’ temperature, annual ice cover, and sea levels. This alteration influences the global economy through enriched international trade and fossil hydrocarbon extraction developments. This capstone examines the Arctic’s response to CC through economic statistical analysis, tracking relative sea-level (RSL) trends, as well as performing hydrographic and modeling reviews. The Northern Rim Countries (NRCs) economic analysis assesses potential CC and GSLR impacts by applying statistical techniques to calculate its effect on each country’s gross domestic product (GDP). The tidal data analysis includes both Arctic and Pacific NW tidal stations mean sea level trends, which projects GSLR for each station. Arctic sea ice melt also increases shipping opportunities, which consequently amplifies marine casualty statistics. Maritime casualties raise pollution threats to the Arctic’s indigenous communities and its endangered species. The United States Coast Guard (USCG) conducted the Port Access Route Study (PARS) to mitigate casualty risk by identifying vessel traffic routes. This study examines the PARS hydrographic data, as well as the courses implemented to safeguard the environment. This review also interprets model analysis and biota case studies in forecasting the adverse GSLR social and economic impacts (Douglas, 2010). Lastly, this capstone explores existing mitigation strategies and policies in determining its adequacy in addressing the Arctic’s vulnerabilities. The policy review includes NRCs mitigation efforts, the Polar Code, and other Arctic ecosystem legislation implemented to counterbalance the developing economic exploits

Old Prouts Neck

Old Prouts Neck by Augustus F. Moulton. Marks Printing House, Portland, Maine (1924). Contents: I. Black Point and Prouts Neck / II. The Cammock Patent / III. The Occupation of Henry Jocelyn / IV. The General Situation / V. Scottow and the Indian Wars / VI. Troubles in Peace and Troubles in War / VII. The Second Settlement / VIII. This Becomes Prouts Neck / IX. In the Libby Occupation / X. Locations and Historical Planshttps://digitalcommons.usm.maine.edu/me_collection/1097/thumbnail.jp

Taking the Long View: A Case Study of E-Book Usage at a Comprehensive Research University

The University Libraries at Virginia Tech made their first major acquisition of e-books in 2008 with a purchase of new e-book collections from Springer. While the business relationship has evolved over time, it has continued forward to the present day. Currently, the library’s online holdings include most of the frontlist subject collections available from what is now Springer Nature, as well as the Springer book series and the Springer Book Archives. In all, the University Libraries make over 120,000 e-books available to patrons through the SpringerLink platform. The cumulative usage of this material represents over two million chapter downloads by the university community just since 2012. The large number of titles available and the long-term nature of the acquisitions provide unique opportunities for in-depth analysis. The Springer Nature e-book collections also offer a variety of material types including monographs, textbooks, and reference works integrated onto the same platform. This session provides a case study of Springer Nature e-book usage at Virginia Tech and shows how working directly with a vendor partner can provide an enhanced and more multifaceted view of usage

An Alternate Dimensionless Form of the Linearized Rigid-Body Aircraft Equations of Motion with Emphasis on Dynamic Parameters

The equations of motion for an aircraft can be linearized about a reference condition within the assumptions of small disturbances and linear aerodynamics. The resulting system of equations is typically solved to obtain the eigenvalues and eigenvectors that describe the small disturbance motion of the aircraft. Results from such an analysis are often used to predict the rigid-body dynamic modes of the aircraft and associated handling qualities. This process is typically carried out in dimensional form in most text books, or in nondimensional form using dimensionless parameters rooted in aerodynamic theory. Here we apply Buckingham’s Pi theorem to obtain nondimensional parameters based on the aircraft rigid-body dynamics rather than aerodynamics. This approach may be more useful for understanding how aircraft dynamics scale with appropriate design parameters

Simplified Mass and Inertial Estimates for Aircraft with Components of Constant Density

Aircraft mass and inertial properties are required for predicting the dynamics and handling qualities of aircraft. However, such properties can be difficult to estimate since these depend on the external shape and internal structure, systems, and mass distributions within the airframe. Mass and inertial properties of aircraft are often predicted using computer-aided design software, or measured using various experimental techniques. The present paper presents a method for quickly predicting the mass and inertial properties of complete aircraft consisting of components of constant density. Although the assumption of constant density may appear limiting, the method presented in this paper can be used to approximate mass properties of complex internal structures. Inertial estimates for rectangular cuboids, cylinders, spheres, wing segments, and rotors are presented here. The influence of geometric properties of wing segments such as sweep, taper, airfoil geometry, and dihedral are included. The utility of the method is presented and the accuracy is evaluated with various test cases