Abstract: A prosthetic ankle device is disclosed herein. The prosthetic ankle device includes a hydraulic cylinder with a first chamber, a second chamber, and a piston separating the first chamber and the second chamber. The chambers are filled with hydraulic fluid. During plantarflexion, the hydraulic fluid flows between the first chamber and the second chamber via a first passage and a first check valve. During dorsiflexion, the hydraulic fluid flows between the first chamber and the second chamber via a second passage and a second check valve.

Abstract: A prosthetic ankle device is disclosed herein. The prosthetic ankle device includes a hydraulic cylinder with a first chamber, a second chamber, and a piston separating the first chamber and the second chamber. The chambers are filled with hydraulic fluid. During plantarflexion, the hydraulic fluid flows between the first chamber and the second chamber via a first passage and a first check valve. During dorsiflexion, the hydraulic fluid flows between the first chamber and the second chamber via a second passage and a second check valve. The ankle device includes a third passage and a third check valve, where the third passage diverts flow of the hydraulic fluid from the second passage based at least in part on a system status.

Abstract: Disclosed herein are systems and methods for document based query and information retrieval which rapidly locate similar documents within a document corpora providing a document based search result to the search initiator including one or more estimated measures of similarity for each search result item and appropriate search result document metadata. After providing document based similarity approximation search results, the system also rapidly retrieves and determines more accurate measures of similarity, including the relevant document terms and term statistics used to determine an exact measure of similarity, between the document based query document term collection and individual search result document term collections using one or more computing devices, that are application and platform independent, participating in a distributed multicore processing environment.