Fuel character effects on the J79 and F101 engine combustion systems

The effects of select fuel property variations on two major engine classifications are summarized. Thirteen refined and blended fuels were used which exhibited significant variations in hydrogen content, aromatic type, initial boiling point, final boiling point, and viscosity. Trends were very similar but the degree of fuel sensitivity was not constant. For both systems the dominant fuel property during high pressure operation was found to be fuel hydrogen content. For operation at low pressure test points the fuel volatility and viscosity became the dominant fuel properties for both systems. Aromatic type and final boiling point did not significantly affect combustion data. Correlations of other fuel properties with these and other performance parameters are presented

Overlay board for control consoles

Board that fits over the control panel decreases errors and time loss. Device has cutouts for controls and indicators, bears all appropriate labeling information, can be removed with the changing computer assignments, and guards against accidental changes in control settings

The impact of the Hargreaves Review on photographers in the digital age.

This article revisits some of the questions raised in my undergraduate dissertation in 2005 looking at Online Digital Image Copyright and the adequacy of then current legislation to protect the Intellectual Property Rights of photographers. This article is intended to be an initial exploration of developments since 2005 and the possible impacts on photographers in a digital age

The promised city: openness and immigration in the making of a world metropolis

This article was the keynote address for a conference organized by the Federal Reserve Bank of New York in April 2005, "Urban Dynamics in New York City." The goal of the conference was threefold: to examine the historical transformations of the engine-of-growth industries in New York and distill the main determinants of the city's historical dominance as well as the challenges to its continued success; to study the nature and evolution of immigration flows into New York; and to analyze recent trends in a range of socioeconomic outcomes, both for the general population and recent immigrants more specifically.Economic conditions - New York (N.Y.) ; Federal Reserve District, 2nd ; Immigrants

Effect of thermal expansion on the stability of two-reactant flames

The full problem of flame stability for the two-reactant model, which takes into account thermal expansion effects for all disturbance wave lengths, is examined. It is found that the stability problem for the class of two-reactant flames is equivalent to the stability problem for the class of one-reactant flames with an appropriate interpretation of Lewis numbers

USDA-ARS Hydrology Laboratory MISWG Hydrology Workshop

Current research being conducted in remote sensing techniques for measuring hydrologic parameters and variables deals with runoff curve numbers (CN), evapotranspiration (ET), and soil moisture. The CN and ET research utilizes visible and infrared measurements. Soil moisture investigations focus on the microwave region of the electromagnetic spectrum

Air Force fuel mainburner/turbine effects programs

A program for the determination of fuel property effects on aircraft gas turbine engine mainburners and turbines is discussed. The six engines selected as test candidates are the J79, J85, J57, TF30, TF39, and F100. Fuels election is the responsibility of the contractors with two fuels as exceptions. The petroleum JP-4 is to be used as a baseline in all tests. The shale JP-4 is to be used in nearly all tests. Fuel properties are to be correlated with combustion system performance paramters. In addition, life predictions are to be made for combustor and turbine hardware. These predictions are to be based on a typical mission for each system, measured metal temperatures and temperature gradients, and oxidation/corrosion effects

The interpretive approach to religious education : challenging Thompson's interpretation

In a recent book chapter, Matthew Thompson makes some criticisms of my work, including the interpretive approach to religious education and the research and activity of Warwick Religions and Education Research Unit. Against the background of a discussion of religious education in the public sphere, my response challenges Thompson’s account, commenting on his own position in relation to dialogical approaches to religious education. The article rehearses my long held view that the ideal form of religious education in fully state funded schools of a liberal democracy should be ‘secular’ but not ‘secularist’; there should be no implication of an axiomatic secular humanist interpretation of religions

Developmental Evaluation in Practice: Lessons from Evaluating a Market-Based Employment Initiative

Developmental evaluation (DE) has emerged as an approach that is well suited to evaluating innovative early-stage or market-based initiatives that address complex social issues. However, because DE theory and practice are still evolving, there are relatively few examples of its implementation on the ground. This paper reviews the practical experience of a monitoring and evaluation (M&E) team in conducting a developmental evaluation of a Rockefeller Foundation initiative in the field of digital employment for young people, and offers observations and advice on applying developmental evaluation in practice.Through its work with The Rockefeller Foundation's team and its grantees, the M&E team drew lessons relating to context, intentional learning, tools and processes, trust and communication, and adaption associated with developmental evaluation. It was found that success depends on commissioning a highly qualified DE team with interpersonal and communication skills and, whenever possible, some sectoral knowledge. The paper also offers responses to three major criticisms frequently leveled against developmental evaluation, namely that it displaces other types of evaluations, is too focused on "soft" methods and indicators, and downplays accountability.Through its reporting of lessons learned and its response to the challenges and shortcomings of developmental evaluation, the M&E team makes the case for including developmental evaluation as a tool for the evaluation toolbox, recommending that it be employed across a wide range of geographies and sectors. With its recommendation, it calls for future undertakings to experiment with new combinations of methods within the DE framework to strengthen its causal, quantitative, and accountability dimensions