The 31st Aerospace Mechanisms Symposium

The proceedings of the 31st Aerospace Mechanisms Symposium are reported. Topics covered include: robotics, deployment mechanisms, bearings, actuators, scanners, boom and antenna release, and test equipment. A major focus is the reporting of problems and solutions associated with the development and flight certification of new mechanisms

Design Development Test and Evaluation (DDT and E) Considerations for Safe and Reliable Human Rated Spacecraft Systems

A team directed by the NASA Engineering and Safety Center (NESC) collected methodologies for how best to develop safe and reliable human rated systems and how to identify the drivers that provide the basis for assessing safety and reliability. The team also identified techniques, methodologies, and best practices to assure that NASA can develop safe and reliable human rated systems. The results are drawn from a wide variety of resources, from experts involved with the space program since its inception to the best-practices espoused in contemporary engineering doctrine. This report focuses on safety and reliability considerations and does not duplicate or update any existing references. Neither does it intend to replace existing standards and policy

Shortest Route at Dynamic Location with Node Combination-Dijkstra Algorithm

Abstract— Online transportation has become a basic requirement of the general public in support of all activities to go to work, school or vacation to the sights. Public transportation services compete to provide the best service so that consumers feel comfortable using the services offered, so that all activities are noticed, one of them is the search for the shortest route in picking the buyer or delivering to the destination. Node Combination method can minimize memory usage and this methode is more optimal when compared to A* and Ant Colony in the shortest route search like Dijkstra algorithm, but can’t store the history node that has been passed. Therefore, using node combination algorithm is very good in searching the shortest distance is not the shortest route. This paper is structured to modify the node combination algorithm to solve the problem of finding the shortest route at the dynamic location obtained from the transport fleet by displaying the nodes that have the shortest distance and will be implemented in the geographic information system in the form of map to facilitate the use of the system. Keywords— Shortest Path, Algorithm Dijkstra, Node Combination, Dynamic Location (key words

Space Transportation Propulsion Technology Symposium. Volume 3: Panel Session Summaries and Presentations

The Space Transportation Propulsion Technology Symposium was held at the Pennsylvania State University on June 25 to 29, 1990. Emphasis was placed on propulsion requirements and initiatives to support current, next generation, and future space transportation systems, with the primary objectives of discerning whether proposed designs truly meet future transportation needs and identifying possible technology gaps, overlaps and other programmatic deficiencies. Key space transportation propulsion issues are addressed through four panels with government, industry, and academia membership. The panel focused on systems engineering and integration; development, manufacturing, and certification; operational efficiency; program development; and cultural issues

Air Traffic Management Abbreviation Compendium

As in all fields of work, an unmanageable number of abbreviations are used today in aviation for terms, definitions, commands, standards and technical descriptions. This applies in general to the areas of aeronautical communication, navigation and surveillance, cockpit and air traffic control working positions, passenger and cargo transport, and all other areas of flight planning, organization and guidance. In addition, many abbreviations are used more than once or have different meanings in different languages. In order to obtain an overview of the most common abbreviations used in air traffic management, organizations like EUROCONTROL, FAA, DWD and DLR have published lists of abbreviations in the past, which have also been enclosed in this document. In addition, abbreviations from some larger international projects related to aviation have been included to provide users with a directory as complete as possible. This means that the second edition of the Air Traffic Management Abbreviation Compendium includes now around 16,500 abbreviations and acronyms from the field of aviation

The effect of mould temperature on properties of flexible PU Foam

Cold-cure flexible polyurethane (PU) foam moulded products are manufactured by mixing a polyol and an isocyanate in a preheated tool. Foam moulded products frequently have defects such as varying density and surface defects. Defects resulting in scrap amount to 2-4% which translates into millions of pounds. Past research to reduce flexible foam moulding scrap and improve quality has focussed on chemical compositions, chemical reactions and materials development. This research set about understanding and improvement through a manufacturing focus to control and improve the foam moulding process. It was suspected that an uneven mould temperature was among the causes of defects in flexible PU foam parts. However, no detailed published work focusing on the effect of mould temperature on high-resilience cold-cure flexible PU foam moulded parts was found. The aim of this research was to analyse and quantify the effect of mould temperature on flexible PU foam surface texture and density. This could then be used to implement either conformal or non-conformal heating channel systems in foam moulding tools. A specially designed mould was built to produce PU foam samples at varying temperatures from 30°C to 80°C. A unique approach using a 3D Laser scanner and a CT scanner was adopted to analyse and quantify the effect of mould temperature on the PU foam samples surface texture and density. It was shown that mould temperature had an effect on foam surface texture and density. The foam density increased as the mould temperature reduced, and foam surface texture was coarse at extreme low and high mould temperatures. Analysis with SEM also showed that mould temperature had an effect on foam density due to its effect on foam cell size. Low mould temperature resulted in small cell size contributing to high foam density. High mould temperature resulted in large cell size contributing to low foam density. Results from this research provide a method of predicting the effect of mould temperature on foam density and surface texture at varying temperatures. Results provide a possible method for customising foam density at various sections by developing a non-conformal heating channel to impose large mould temperature variations. Designers and manufacturers could have multiple density in car seats (such as dual density bucket design seats) if required by controlling mould temperature at various mould sections rather than by changing material composition

Data bases and data base systems related to NASA's Aerospace Program: A bibliography with indexes

This bibliography lists 641 reports, articles, and other documents introduced into the NASA scientific and technical information system during the period January 1, 1981 through June 30, 1982. The directory was compiled to assist in the location of numerical and factual data bases and data base handling and management systems

Illinois Technograph v. 063-064 (1947-1949)

Student engineering magazine University of Illinoi

Drug development progress in duchenne muscular dystrophy

Duchenne muscular dystrophy (DMD) is a severe, progressive, and incurable X-linked disorder caused by mutations in the dystrophin gene. Patients with DMD have an absence of functional dystrophin protein, which results in chronic damage of muscle fibers during contraction, thus leading to deterioration of muscle quality and loss of muscle mass over time. Although there is currently no cure for DMD, improvements in treatment care and management could delay disease progression and improve quality of life, thereby prolonging life expectancy for these patients. Furthermore, active research efforts are ongoing to develop therapeutic strategies that target dystrophin deficiency, such as gene replacement therapies, exon skipping, and readthrough therapy, as well as strategies that target secondary pathology of DMD, such as novel anti-inflammatory compounds, myostatin inhibitors, and cardioprotective compounds. Furthermore, longitudinal modeling approaches have been used to characterize the progression of MRI and functional endpoints for predictive purposes to inform Go/No Go decisions in drug development. This review showcases approved drugs or drug candidates along their development paths and also provides information on primary endpoints and enrollment size of Ph2/3 and Ph3 trials in the DMD space