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.
The recombination pumping scheme for soft X-Ray lasers has better energy scaling, than the collisional-excitation pumping scheme. Implementation of an H-like 3 → 2 Nitrogen recombination laser, at λ∼13.4 nm requires initial conditions of at least 50% fully stripped Nitrogen, kTe∼140eV and ne∼1020cm−3. In order to reach population inversion, the plasma cooling to below 60eV should be faster than the...
In this study we present an efficient image categorization and retrieval system applied to medical image databases, in particular large radiograph archives. The methodology is based on local patch representation of the image content, using a “bag of visual words” approach. We explore the effects of various parameters on system performance, and show best results using dense sampling...
We present an efficient image categorization and retrieval system applied to medical image databases, in particular large radiograph archives. The methodology presented is based on local patch representation of the image content and a bag-of-features approach for defining image categories, with a kernel based SVM classifier. In a recent international competition the system was ranked as one of the...
Summary form only given. A recombination based X-ray laser has a preferred energy scaling compared to the collisional ionization scheme. Implementing a nitrogen recombination laser at lambda~13.4 nm, requires a confined plasma initially at Te~140 eV and Ne~1020 cm-3 to be rapidly cooled to Te<60 eV. The cooling time scale should be shorter than the 3-body recombination time scale of 3-6 ns. The...
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.