Allan Seabridge

Aircraft Systems: Mechanical, Electrical, and Avionics Subsystems Integration, Third Edition

Fight control systems engine control systems fuel systems hydraulic systems electrical systems pneumatic systems envronmental control systems emergency systems helicopter systems advanced systems systems design and development avionics technology.

8. Practical Considerations

Jan Butler has many years experience in the field of equine radiology. She was based at the Animal Health Trust from 1975 to 1997, and now works in private practice at the Willesley Equine Clinic in Gloucestershire. She is coauthor of Clinical Radiology of the Horse, published by Blackwell Publishing, and has lectured on equine radiography and radiation safety. WHEN preparing for radiographic examination of a horse, the projections required, positioning of the animal and centring of the primary x-ray beam are routinely considered, whereas other aspects of the procedure, such as choice of screens and films, and processing techniques, can easily be overlooked. The ideal would be to select the best of each of the many factors that affect the quality of a radiograph when establishing a radiographic technique. Ultimately, however, the final choice is a compromise, as selecting the best option for one factor often has a negative effect on another. In deciding how to obtain the best images possible, the whole procedure, from positioning of the horse to darkroom technique, needs to be considered. This article provides guidance on some key aspects and draws attention to the requirements of current radiation safety regulations. Future articles will discuss radiography of specific anatomical regions of the horse, commencing in the next issue with the foot and pastern.

5. Systems Architectures

Describes the benefits of synthesizing from a hardware description language (HDL). These benefits are illustrated using ELLA descriptions of simple architectures. The architectures are described at a high level of abstraction. The reference level for synthesis is raised above what was previously available. This makes it possible for system engineers to design ASICs.

The Design Process

At the beginning of each activity, students are asked to identify the problem that their designs will address. This step is important because it informs the rest of the design process and defines how success will be measured. The scenarios presented in the book vary. Some are true problems that need to be solved, such as how to safely filter water samples. Others focus on improving an existing design, such as building a device that allows students to flip a light switch from across the room. A handful are more conceptual in nature. For example, students would not be expected to design an actual dam and experiment with water flow to observe effects on the environment. The purpose of activities such as these is to help students understand some basic design concepts and apply those concepts to different problems or tasks.