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.
Crystal oscillators and filters are still very important devices in modern telecommunication and measurement equipment. Quartz crystal units are basic elements for those oscillators and filters, due to their extremely stable resonant frequency and Q-factor. Matched crystal filters are consisted of filter sections with the same phase characteristics. In this paper the design and realization of a new...
Paper describes a new technological process of suppression of spurious in fifth overtone crystal units (CU) AT cut type. The development of new crystal filter is based on micro-miniature quartz crystal units, because of the reduced size of new devices in telecommunications. One of the most important characteristics of CU quality is possibility of suppression of spurious resonances, and this method...
Low-pass image filtering, especially averaging, causes edge blurring. To prevent this effect we propose in this paper controlled low-pass filtering. Local dimension is used as a control parameter, favoring only non-edge-like regions for filtering. Multifractal capacities used in that aim are maximum and minimum multifractal capacities, since of their sensitivity on edges. Obtained results are evaluated...
In modern communications, particularly digital one, it is very important to implement quality modules for receiver, transmitter and/or repeater units. One of the most significant components of those modules are crystal filters. This paper presents a computer simulation of crystal filter composed by four crystal units. By changing the filter parameters it is possible to tune the pass-band and stop-band...
Tc-DMSA renal scintigraphy is widely accepted as the most sensitive method for evaluating renal parenchym damage like renal scars. Both qualitative and quantitative evaluation standards are used for improving DMSA scintigraphy interpretation. DMSA scan region of interest detection is the first step towards defect revealing and renal morphology evaluation. This paper considers an approach of using...
In image processing edges are observed as singularities. Calculating gradient is regular procedure for locating edges within the image. However, there are edges with different order of that given by gradient. Hölder exponent gives mathematical background for different types of edges considering differentiation. In this paper we analyze some well known capacities, needed in pointwise Hölder exponent...
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.