The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper, the design of the mechanism and the control system of a planetary wheeled stair-climbing wheelchair is introduced. The dynamic model of the planetary wheel clusters is established based on Lagrange equation, and the angle acceleration curves are studied with various given equivalent torques. Stability margin of the wheelchair is analyzed in detail during a single step climbing procedure...
In this paper, a new multi-function powered wheelchair is introduced, in which the driven mechanics are two sets of hybrid planetary wheels, each of them are consisted of one powered wheel and two free wheels. This wheelchair can work in three modes: stair-climbing mode, powered wheelchair mode and manual mode. In stair-climbing mode, an assistant can control the wheelchair to climb up and down stairs...
Covert-tracking robot refers to the mobile robot that not only can follow a human objective, but at the same time can control itself to keep away from the human's visual field. This paper proposes a head orientation estimation method based on probability model, which can help the robot to implement its covert behaviors. First, the elliptical head contour is tracked out by using a method based on quadrant...
A practical automatic system called ALDS (automatic leak detection system) is presented in this paper, which is implemented for leak detection of sealed radioactive sources used for oil well logging in oilfields. This ALDS is able to accomplish the work of leak detection automatically, which not only guarantees the safety of staff but also offers better quality and reliability. Furthermore, ALDS is...
During the past two decades, concern about the western Pacific Warm Pool (WP) has been growing following the recognition of its significant role in global climate change and its close association with El Nino-Southern Oscillation phenomena. A fundamental issue in WP related studies is to locate its centroid and track its trajectory. The method used by some previous researchers for estimating the WP...
The documentation of the zonal pattern of global wind system can be traced back to centuries ago. The prevailing descriptions in most oceanography books, however, have been of little change during the past decades. The present work represents a new effort to update our knowledge on this issue using the newly available multi-year TOPEX altimeter data. As a result, the positions and intensities of major...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.