Sagamore Hill National Historic Site, New York, official map and guide /

"*GPO:2000--460-976/00304."

Sagamore Hill National Historic Site, New York, official map and guide /

"*GPO:2001--472-470/40090."

Sagamore Hill National Historic Site, New York, official map and guide /

"*GPO:2002--491-282/40310."

Sagamore Hill National Historic Site, New York, official map and guide /

"*GPO:2003--496-196/40525."

Sagamore Hill National Historic Site, New York /

"*GPO: 2005--310-394/00321."

Sagamore Hill National Historic Site, New York /

"*GPO:2008--339-126/80006 Reprint 2008."

Sagamore Hill National Historic Site, New York /

"*GPO:2010--357-940/80371 Reprint 2010."

Obsolescence and Renewal: Transformation of Post War Concrete Buildings

In this thesis I investigate issues of post-war concrete buildings and how we can both add value and make adaptable what we have traditionally defined as not valuable and not adaptable. 55% of United States’ commercial building stock was built between the years of 1960 and 1980, leaving 36 billion square feet of building material to be adaptively reused or at the bottom of a landfill. Currently, our culture does not value many character defining features of these buildings making the preservation of these buildings difficult, especially at this 50 year critical moment of both the attribution of a “historic” status and time when major renovation of these buildings needs to occur. How can architects add value to a building type, sometimes called “brutalist”, that building culture currently under values and thinks is “obsolete”? I tested this hypothesis using the James Forrestal Building in Washington D.C. After close study of the obsolescence, value,history and existing conditions, I propose a design that adds value to Southwest Washington D.C. and may serve as an example for post-war renewal around the country.

New Jersey Coastal Heritage Trail /

Also shows project area, subregions, and welcome centers.

New Jersey Coastal Heritage Trail /

Also shows project area, subregions, and welcome centers.

New Jersey Coastal Heritage Trail /

Also shows project area, subregions, and welcome centers.

Map of National Zoological Park, D.C. /

Relief shown by contours and hachures.

Incidencia de la desmovilización de las AUC en la política de seguridad ciudadana y convivencia de Bogotá D.C durante el periodo 2004 -2013

El interés de este Estudio de Caso, tiene como objetivo analizar la incidencia de la desmovilización de las Autodefensas Unidas de Colombia (AUC) en la Política de Seguridad Ciudadana y Convivencia de Bogotá (PSCCB) durante el periodo 2004 – 2013. Se identifica y analiza, cómo se incluyó un programa para desmovilizados en la Política de Seguridad Ciudadana y Convivencia; además de la reconfiguración de las estructuras del crimen organizado tras dicha desmovilización. Lo anterior, para explicar el aumento de los delitos de alto impacto y la percepción de inseguridad en la capital durante este periodo de tiempo.

Thermal studies of D.C. traction motors

This paper describes a thorough thermal study on a fleet of DC traction motors which were found to suffer from overheating after 3 years of full operation. Overheating of these traction motors is attributed partly because of the higher than expected number of starts and stops between train terminals. Another probable cause of overheating is the design of the traction motor and/or its control strategy. According to the motor manufacturer, a current shunt is permanently connected across the motor field winding. Hence, some of the armature current is bypassed into the current shunt. The motor then runs above its rated speed in the field weakening mode. In this study, a finite difference model has been developed to simulate the temperature profile at different parts inside the traction motor. In order to validate the simulation result, an empty vehicle loaded with drums of water was also used to simulate the full pay-load of a light rail vehicle experimentally. The authors report that the simulation results agree reasonably well with experimental data, and it is likely that the armature of the traction motor will run cooler if its field shunt is disconnected at low speeds

The development of a conceptual framework for a district 4-Year Pavement Management Plan, implementation of network-level project screening process

The Texas Department of Transportation (TxDOT) is concerned about the widening gap between preservation needs and available funding. Funding levels are not adequate to meet the preservation needs of the roadway network; therefore projects listed in the 4-Year Pavement Management Plan must be ranked to determine which projects should be funded now and which can be postponed until a later year. Currently, each district uses locally developed methods to prioritize projects. These ranking methods have relied on less formal qualitative assessments based on engineers’ subjective judgment. It is important for TxDOT to have a 4-Year Pavement Management Plan that uses a transparent, rational project ranking process. The objective of this study is to develop a conceptual framework that describes the development of the 4-Year Pavement Management Plan. It can be largely divided into three Steps; 1) Network-Level project screening process, 2) Project-Level project ranking process, and 3) Economic Analysis. A rational pavement management procedure and a project ranking method accepted by districts and the TxDOT administration will maximize efficiency in budget allocations and will potentially help improve pavement condition. As a part of the implementation of the 4-Year Pavement Management Plan, the Network-Level Project Screening (NLPS) tool including the candidate project identification algorithm and the preliminary project ranking matrix was developed. The NLPS has been used by the Austin District Pavement Engineer (DPE) to evaluate PMIS (Pavement Management Information System) data and to prepare a preliminary list of candidate projects for further evaluation.