This paper deals with signal processing techniques for non-destructive fault detection on gearbox of helicopter by using time synchronous averaging. Time synchronous averaging is a signal processing technique that is used to extract repetitive signals from additive noise. This process requires an accurate measurement of the repetitive frequency of the desired signal or a signal that is synchron...

Synchronous programming is a school of thought in embedded software which has been in the air for a while but without being always given clear and thorough explanations. This has led to many misunderstandings as, for instance, opinions like: “we do not use synchronous programming because null execution time is not realistic and infinitely fast machines do not exist”. At the same time many pract...

Synchronous languages have been designed to ease the de velopment of reactive systems by providing a methodological frame work for assisting system designers from the early stages of requirement speci cations to the nal stages of code generation or circuit produc tion Synchronous languages enable a very high level speci cation and an extremely modular design of complex reactive systems We de ne...

To speed up production systems, many researchers have turned to parallel implementations. We describe a system called PARS that executes production rules in parallel. PARS is novel because it (1) executes many rules simultaneously, (2) runs in a highly asynchronous fashion, and (3) runs on a distributed memory machine. Item (1) improves available concurrency over systems that only perform the M...

Synchronous languages are dedicated to hardware, software, or mixed reactive systems that maintain a continuous interaction with their environment. They come in two classes: data-oriented languages such as Lustre and Signal, .which are targeted to data-intensive applications such as continuous control or signal processing, and control-oriented languages or visual formalisms such as Esterel, Sta...

Synchronous carcinomas have been recognized for over a century, with synchronous primary adenocarcinoma of the colon reported to range from 2-11% of cases involving this type of malignancy. Small cell carcinomas occur frequently with colorectal adenomas; however, despite these reports and a known adenoma-to-carcinoma sequence, scarce literature exists on synchronous colorectal adenocarcinoma an...

Synchronous programming languages have been extensively used in the area of critical embedded systems. Synchronous machines, a specific class of labelled transition systems, are often used to give denotational semantics of these languages. In this work, we study the categorical structure of the aforementioned machines. We first show that the category S of synchronous machines can be given a tra...

Various electric machines can be the candidate for electric vehicles applications, including induction machines, permanent magnet synchronous machines, switched reluctance machines, etc. Another class of machine, which has been relatively ignored, is synchronous reluctance machines. In order to enhance and increase torque density of pure synchronous reluctance machines, the low cost permanent m...

The overall accuracy of a system is primarily decided by how correctly the synchronous machines within the system are modelled. The use of a second order model of synchronous generator is usually assumed to be sufficient to simulate the machine response. Yet this is inadequate for transient study. A simulation model is set up to examine the response of the synchronous machine during transient s...

abstract thymic carcinoid is an uncommon neoplasm that can present with cushing syndrome. we report a 39-year old woman with symptoms of cushing syndrome secondary to thymic carcinoid and synchronous with tuberculous lymphadenitis and pulmonary tuberculosis.