Energy Efficient Engine: Control system component performance report

An Energy Efficient Engine (E3) program was established to develop technology for improving the energy efficiency of future commercial transport aircraft engines. As part of this program, General Electric designed and tested a new engine. The design, fabrication, bench and engine testing of the Full Authority Digital Electronic Control (FADEC) system used for controlling the E3 Demonstrator Engine is described. The system design was based on many of the proven concepts and component designs used on the General Electric family of engines. One significant difference is the use of the FADEC in place of hydromechanical computation currently used

Energy Efficient Engine (E3) controls and accessories detail design report

An Energy Efficient Engine program has been established by NASA to develop technology for improving the energy efficiency of future commercial transport aircraft engines. As part of this program, a new turbofan engine was designed. This report describes the fuel and control system for this engine. The system design is based on many of the proven concepts and component designs used on the General Electric CF6 family of engines. One significant difference is the incorporation of digital electronic computation in place of the hydromechanical computation currently used

Konzeption, Implementierung und Inbetriebnahme einer postgreSQL-Datenbank - Bericht zum Modul Praxis I

Dieser Bericht befasst sich mit dem Einrichten und der Inbetriebnahme einer Datenbank. Zu diesem Zweck werden zuerst allgemeine Grundlagen im Bereich der Datenbanken dargelegt. Dabei erfolgt auch eine Erläuterung einiger grundlegender SQL-Befehle, die bei der Arbeit auf einer Datenbank unverzichtbar sind. Anschließend wird ein Pythonprogramm, welches die Arbeit auf der Datenbank übernimmt, entworfen und die Einrichtung einer speziellen Tabelle, die die Log-Daten der Prozessierung flugzeuggestützter Radardaten enthält, beschrieben. Der Schwerpunkt liegt hierbei auf dem Entwurf des Tools und der konkreten Implementierung desselben. Dabei wird die innere Struktur des Programms und deren praktische Umsetzung beschrieben

Resources Related to Mathematics, Art and Nature

The purpose of my sabbatical work was to learn about resources related to mathematics and art, nature, music and architecture. These subjects appeal to a wide audience, yet their mathematical connections are often on the periphery of a mathematics student\u27s studies. In this way I planned to increase my knowledge of mathematics but at the same time broaden my understanding of cross-disciplinary subjects

Control means for a gas turbine engine

A means is provided for developing a signal representative of the actual compressor casing temperature, a second signal representative of compressor inlet gas temperature, and a third signal representative of compressor speed. Another means is provided for receiving the gas temperature and compressor speed signals and developing a schedule output signal which is a representative of a reference casing temperature at which a predetermined compressor blade stabilized clearance is provided. A means is also provided for comparing the actual compressor casing temperature signal and the reference casing temperature signal and developing a clearance control system representative of the difference. The clearance control signal is coupled to a control valve which controls a flow of air to the compressor casing to control the clearance between the compressor blades and the compressor casing. The clearance control signal can be modified to accommodate transient characteristics. Other embodiments are disclosed

Integrated control system for a gas turbine engine

A control system for a turbofan engine receives signals from a number of engine sensors and from the engine operator, and generates control signals. One control signal regulates the fan exhaust nozzle area in order to control inlet throat Mach number to maintain a low level of engine noise. Additional control signals regulate fuel flow to control engine thrust and fan pitch to control fan speed. A number of schedules are utilized to maintain a predetermined relationship between the controlled parameters and a number of fixed and calculated limits can override the control signals to prevent unsatisfactory engine performance

Nutritional status and nutritional therapy in pediatric and adolescent patients submitted to autologous hematopoietic stem cell transplantation

Introduction: To assess the use of nutritional support in children and adolescents submitted to autologous hematopoietic stem cell transplantation (HSCT), and analyze changes in nutritional status at hospital discharge after HSCT. Methods: A retrospective observational study was conducted on pediatric oncology patients hospitalized for autologous HSCT between 2010 and 2017. Nutritional therapy was evaluated based on the duration of enteral tube feeding (ETF) and parenteral nutrition (PN), either alone or in combination. The length of hospital stay was measured in days. Nutritional status was assessed at admission and discharge, and classified according to World Health Organization criteria. Results: The sample consisted of 68 patients, 54.4% of whom were boys. Most participants (89.7%) had solid tumors. Nutritional therapy was required in over half (52.9%) of cases, with PN being the most common indication. There was a reduction in the percentage of overweight patients and an increase in the percentage of underweight patients at discharge relative to admission. Conclusions: The use of nutritional therapy is highly prevalent in this population, and HSCT has a negative impact on nutritional status at discharge

An ethnography of the one laptop per child (OLPC) programme in Uruguay

This thesis is an ethnographic study of the Uruguayan programme CEIBAL, which aims to promote social inclusion by providing children and teachers with laptop computers. The novelty of the study lies in the fact that it illustrates empirically the complicated work of conceiving, implementing and sustaining policy in practice, both at the macro level and through local instantiations. This was achieved in three inter-related ways. First, by looking at how the national project of development was conceptualised around themes of techno-modernity and consolidated the promise of inclusiveness through claims on the universality of ‘technical needs’. Technology provided the conceptual space in which to resolve a presumed dichotomy between themes of equality, education and paternalistic state and those of economic development, modernisation and innovation. Second, it was analysed by exploring the way in which heterogeneous assemblages of people, values, laptops, and interests, were mobilized to stabilize the programme’s material and conceptual order across a wide range of sites and actors. This was based on the recognition of a ‘natural affinity’ between CEIBAL and Uruguay, which concealed differences, provided coherence and built a strong sense of ‘national consensus’. And finally, as a result of the other two, it was analysed by examining the relationship between ‘the technical’ and ‘the social’ as inscriptions and ‘fudged’ values objectified in the device faced users and their expectations. This implied looking at how CEIBAL officials attempted to make the laptop embody a political and moral project of inclusion, and its infinite promises, so that it could perform them. People in the three localities studied in this thesis (Montevideo, Paysandú and Queguayar) created very tangible strategies for dealing with notions of ‘social inclusion’, expressed different understandings of how technologies created possibilities for them and enacted these beliefs through a wide range of practices. This included the creation of new metaphors of ‘social inclusion’ through the notion of ‘connectivity,’ reconfiguring both social values and definitions of what constitute ‘connections’ as a result: the laptop’s ability to connect children with each ‘wired up the social fabric.’ These negotiations over the possibility of making connections are explored through a new concept that I refer to as ‘geographies of possibilities,’ which describes topographies of power that influence people’s ability to make technology perform. The key to this notion lies in the recognition of several forms of agency that are enacted in strategies to navigate through different geographies: people are not mere recipients of policy but active constituents of its various forms and instantiations in practice