Interface concerns of ejector integration in V/STOL aircraft

A number of areas which have in the past contributed to weight, complexity, and thrust losses in the ejector-powered V/STOL vehicle were identified. Most of these interfaces taken singly do not represent a severe compromise to the vehicle; however, the bottom line is that the sum of compromises and the subsequent effects on performance, flight operations and maintenance have rendered the ejector V/STOL aircraft unattractive. In addition to some of the unique ejector/aircraft integration problems, the vehicle by virtue of having a V/STOL capability, is compromised in other areas. To be successful and acceptable, the advantages must outweight the disadvantages and simplicity with minimum penalties must be the rule. It is concluded that more emphasis must be placed on the ejector/aircraft interface for the concept to be successful

I Don\u27t Care If I Ever Get Back: Marathons Lasting 20 or More Innings

This article looks at marathon games of baseball. For purposes of this article, a marathon is defined as a game lasting 20 or more innings. In my research I have discovered 341 marathons. These games are hard to find. Leagues either keep no records, or keep track only of their longest game; only the Texas League keeps records on all marathons. Nobody has ever before explored such questions as: What is the probability a game will go x number of innings? How often should we expect a marathon of 20 or more innings, or 40 or more innings? What is the probability the 26-inning major league record will be broken this year? Which is “rarer,” the 26-inning major league record, 33-inning minor league record, or 45-inning “other” category record? In this article we’ll answer these questions

Quasigeometric Distributions and Extra Inning Baseball Games

Each July, the eyes of baseball fans across the country turn to Major League Baseball’s All-Star Game, gathering the best and most popular players from baseball’s two leagues to play against each other in a single game. In most sports, the All-Star Game is an exhibition played purely for entertainment. Since 2003, the baseball All-Star Game has actually ‘counted’, because the winning league gets home field advantage in the World Series. Just one year before this rule went into effect, there was no winner in the All-Star Game, as both teams ran out of pitchers in the 11th inning and the game had to be stopped at that point. Under the new rules, the All-Star Game must be played until there is a winner, no matter how long it takes, so the managers need to consider the possibility of a long extra inning game. This should lead the managers to ask themselves what the probability is that the game will last 12 innings. What about 20 innings? Longer? In this paper, we address these questions and several other questions related to the game of baseball. Our methods use a variation on the well-studied geometric distribution called the quasigeometric distribution. We begin by reviewing some of the literature on applications of mathematics to baseball. In the second section we will define the quasigeometric distribution and examine several of its properties. The final two sections examine the applications of this distribution to models of scoring patterns in baseball games and, more specifically, the length of extra inning games

Electron beam X-Y deflection system Final report

Design and fabrication of electron beam X-Y deflection system for retrofit on welding gun

Thomas J. Blanchard, carpenter in rural East Tennessee

The primary objective of this thesis was to research and document, utilizing all information currently available, the work and life of a traveling carpenter named Thomas J. Blanchard. Mr. Blanchard lived in East Tennessee from 1846 to 1870, however, little is known of his work. Specific goals were to document his life before he relocated to East Tennessee and to attempt to document any work he accomplished while living in the state of Tennessee in a historically accurate manner. Therefore, the historical setting for this rural area of East Tennessee is also studied and documented, in an attempt to identify the resources available to a carpenter such as Thomas Blanchard during this early era of the United States\u27 architectural history. Primary sources for the study include census records, deeds, a receipt signed by Blanchard, and court documents. In addition early newspapers and oral histories provided further information. Exterior and interior architectural details of houses attributed to Blanchard were photographed and compared to pattern books of the period that may have been used by a carpenter such as Blanchard. This information also identified the style of homes being built at the time and what exterior and interior details these houses had in common with others being built in Tennessee and the United States during the 1840\u27s. This study answers some questions about the type of life Thomas Blanchard led and the sort of work he did, while other questions are left unresolved due to the lack of information and the inability to find any descendents of Thomas J. Blanchard to verify information

Predicting uncertainty in sediment transport and landscape evolution - the influence of initial surface conditions

© 2015. Numerical landscape evolution models were initially developed to examine natural catchment hydrology and geomorphology and have become a common tool to examine geomorphic behaviour over a range of time and space scales. These models all use a digital elevation model (DEM) as a representation of the landscape surface and a significant issue is the quality and resolution of this surface. Here we focus on how subtle perturbations or roughness on the DEM surface can produce alternative model results. This study is carried out by randomly varying the elevations of the DEM surface and examining the effect on sediment transport rates and geomorphology for a proposed rehabilitation design for a post-mining landscape using multiple landscape realisations with increasing magnitudes of random changes. We show that an increasing magnitude of random surface variability does not appear to have any significant effect on sediment transport over millennial time scales. However, the random surface variability greatly changes the temporal pattern or delivery of sediment output. A significant finding is that all simulations at the end of the 10,000 year modelled period are geomorphologically similar and present a geomorphological equifinality. However, the individual patterns of erosion and deposition were different for repeat simulations with a different sequence of random perturbations. The alternative positions of random perturbations strongly influence local patterns of hillslope erosion and evolution together with the pattern and behaviour of deposition. The findings demonstrate the complex feedbacks that occur even within a simple modelled system

Creating a Culture of Security in the University of Maryland Libraries

Citation: Lowry, Charles B. and Lori A. Goetsch, “Creating a Culture of Security in the University of Maryland Libraries,” portal: Libraries and the Academy, 1(4):455-464, October 2001.A critical part of building a shared culture of mutual responsibility for security and safety is a thorough understanding of all the elements of a library’s security environment. To address the need for a more coherent approach to library safety and security that reinforces a philosophy of shared responsibility among all staff, the University of Maryland Libraries embarked upon an assessment of policies, procedures, and facilities in partnership with the Association of Research Libraries. Begun in the fall of 1997, the security study and subsequent development of practice and policy were implemented over a two-year period and serve as a model comprehensive approach for a large academic library system