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Povzetek: Background. Mammotome is a percutaneous biopsy technique with a large needle, assisted by vacuum aspiration. The single insertion technique allows to collect multiple large tissue samples, which gives a more reliable histological result. The technique can be used under stereotactic, MRl or ultrasound guidance. The technique is used under local anesthesia, on an outpatient basis. Conclusions. Altough it is essentially a diagnostic technique, it has a therapeutic potential in some cases. Recently, the technique has been FDA approved for the removal of benign nodular lesions. Worldwide, over 2 million procedures have already been performed. It has the potential to replace surgical open biopsy, with a similar accuracy and at a lower cost, and it is less invasive.
Objavljeno v DiRROS: 01.12.2023; Ogledov: 204; Prenosov: 54
Celotno besedilo (274,38 KB)

Objavljeno v DiRROS: 06.11.2023; Ogledov: 279; Prenosov: 145
Celotno besedilo (1,52 MB)
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Povzetek: Bridge weigh-in-motion systems use instrumented bridges or culverts to weigh vehicles as they pass over the structures. They also provide data to allow the calculation of several bridge performance indicators. The article starts with the basics of a bridge weigh-in-motion system and briefly describes two key bridge performance indicators, girder distribution factor and dynamic amplification factor, which are also derived from B-WIM measurements. The central part of the article focuses on monitoring of influence lines, the third key parameter that characterises the bridge performance under traffic loads. First, the method of calculating the bending moment influence lines from random heavy traffic is described. A coefficient of rotational stiffness is introduced, which defines the shape of influence lines around the supports as a linear combination of the ideal simply supported and fixed supported influence lines, to allow quantifying the influence line changes. Then the long-term monitoring of influence lines is investigated on four different single-span test bridges. The initial focus is given on the examination of the effect of temperature on the shape of influence lines. Finally, two sets of influence lines are compared on one test bridge, one from before and the other from after replacing the expansion joints and bearings. The work done so far confirms that calculating of influence lines from random vehicles with a B-WIM system is entirely feasible and that differences in their shape can be detected on single-span bridges. What remains to be investigated is the comparison of these differences to the actual damages and under which circumstances the proposed procedure can compete with or better the routine bridge inspection and the conventional monitoring techniques.
Ključne besede: bridge loading, bridge response, temperature dependency, influence line, monitoring
Objavljeno v DiRROS: 12.09.2023; Ogledov: 427; Prenosov: 154
Celotno besedilo (2,38 MB)
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Povzetek: Stresni zlomi medenice po obsevanju so že dolgo znana posledica obsevanja tumorjev v področju medenice. Čeprav so zlasti v področju sakruma relativno pogost pojav, je njihova diagnostika zaradi nespecifičnosti simptomov težavna. V tem preglednem članku smo pregledali literaturo, ki zajema etiologijo, incidenco, dejavnike tveganja, simptome in diagnostiko ter zdravljenje in preprečevanje stresnih zlomov medenice po obsevanju. Na podlagi pridobljenih podatkov smo poskušali strniti in predstaviti najdene ugotovitve z navedenih področij, ki bi nam bile lahko v pomoč v vsakodnevni radioterapevtski klinični praksi, saj standardiziranih priporočil na tem področju nismo našli.
Ključne besede: stresni zlomi medenice, obsevanje, incidenca
Objavljeno v DiRROS: 27.07.2023; Ogledov: 344; Prenosov: 90
Celotno besedilo (231,02 KB)

Povzetek: This study describes the development and testing of a railway bridge weigh-in-motion (RB-WIM) system. The traditional bridge WIM (B-WIM) system developed for road bridges was extended here to calculate the weights of railway carriages. The system was tested using the measured response from a test bridge in Poland, and the accuracy of the system was assessed using statically-weighed trains. To accommodate variable velocity of the trains, the standard B-WIM algorithm, which assumes a constant velocity during the passage of a vehicle, was adjusted and the algorithm revised accordingly. The results showed that the vast majority of the calculated carriage weights fell within %5% of their true, statically-weighed values. The sensitivity of the method to the calibration methods was then assessed using regression models, trained by di%erent combinations of calibration trains.
Ključne besede: bridge weigh-in-motion, railway bridge loading, bridge instrumentation, B-WIM
Objavljeno v DiRROS: 22.05.2023; Ogledov: 351; Prenosov: 165
Celotno besedilo (6,18 MB)
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