Anal canal duplication with heterotopic gastric mucosa and anal stenosis: first case report and literature review

IntroductionAnal canal duplication (ACD) is a rare entity of gastrointestinal duplication that may be asymptomatic or present complications, such as abscess, fistulae, or malignant changes.The diagnosis and rational management of ACD still need to be clarified.Case presentationWe present a case of an 18-month-old girl with intractable perianal eros

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A Novel Vibration Control System Applying Annularly Arranged Thrusters for Multiple Launch Rocket System in Launching Process

Multiple Launch Rocket System (MLRS) Welding Positioner has been widely used in recent years; vibration control in launching process is an effective way to improve its dispersion characteristics.In this paper, a novel vibration control system applying Annularly Arranged Thrusters (AAT) for MLRS in launching process is introduced and the prototype o

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