National Repository of Grey Literature 13 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
Large-area scans of paintings with high resolution
Vopálenský, Michal ; Kumpová, Ivana
The aim of the measurement was to obtain the radiographs from historical paintings from the Faculty of Restoration of the University Pardubice. Due to the dimensions of the paintings (up to 90 x 110 cm) it was necessary to develop a suitable measurement procedure for successive scanning of the paintings in the TORATOM device. The resulting data are important for the planning of the restoration processes of the paintings and can help to discover otherwise invisible details, like underpaintings etc.
Tomographical investigation of the historical metal bracelets
Kumpová, Ivana ; Vopálenský, Michal
The work was focused on the method definition for the investigation of historical metal artifacts employing the X-ray tomography. Two metal bracelets made of brass and plated with silver were investigated in the laboratory. The goal was to determine the technology of manufacturing and damages, possible also to visualize the silver layer.
Historical lingerie: 18th century corset
Kumpová, Ivana ; Vopálenský, Michal
The work was focused on the methodology using X-ray tomographical imaging for the exploration of the textile-based historical artifacts. The 18th-century corset was investigated by this method. The inspection was conducted to reveal the production technology, design solution, decoration and possible damage in the front area where the whalebones converge. The computed tomography performed on the TORATOM device enabled visualisation of the internal structure of the area of interest with high precision. Sewing details and details of the composition of different material layers are well visible. Fractures and frayed ends of the whalebones were observed. In the area of interest, it is possible to distinguish several materials used for padding of the plastic parts.
Instrumentation of four-point bending test during 4D computed tomography
Kytýř, Daniel ; Fíla, Tomáš ; Koudelka_ml., Petr ; Kumpová, Ivana ; Vopálenský, Michal ; Vavro, Leona ; Vavro, Martin
High-resolution time-lapse micro-focus X-ray computed tomography is an effective method for investigation of deformation processes on volumetric basis including fracture propagation characteristics of non-homogeneous materials subjected to mechanical loading. This experimental method requires implementation of specifically designed loading devices to X-ray imaging setups. In case of bending tests, our background research showed that no commercial solution allowing for reliable investigation of so called fracture process zone in quasi-brittle materials is currently available. Thus, this paper is focused on description of recently developed in-situ four-point bending loading device and its instrumentation for testing of quasi-brittle materials. Proof of concept together with the pilot experiments were successfully performed in a CT scanner TORATOM. Based on results of the pilot experiments, we demonstrate that crack development and propagation in a quasi-brittle material can be successfully observed in 3D using high resolution 4D micro-CT under loading.
Analysis of Baroque sculpture based on X-ray fluorescence imaging and X-ray\ncomputed tomography data fusion
Vavřík, Daniel ; Kumpová, Ivana ; Vopálenský, Michal ; Lauterkranc, J.
It is advantageous to combine information about geometry and the inner structure of historical artifacts with information about the elemental composition of decorative layers, typically covering historical wooden sculptures. X-ray computed tomography describing artifact structure is quite common and easy. Standard X-ray fluorescence (XRF) analysis of decorative layers is typically done for several selected spots of the artifact’s surface utilizing single pad detector. XRF imaging fully describing the surface’s elemental composition is commonly done for flat objects, while time consuming XRF tomography is applied to relatively small objects. It will be shown in this work that an effective fusion combination of XRF imaging and X-ray tomography describing the whole object can be realized even when using a limited number of XRF images.
Optimization of acquisition parameters in radiography and tomography
Vopálenský, Michal ; Vavřík, Daniel ; Kumpová, Ivana
Contrast in radiographic images is one of the most important parameters both in radiography and tomography. This paper investigates the possibility of adjusting the radiographic parameters, in particular the accelerating voltage of the X-ray tube, in order to maximize the difference in the detected intensity in response to the change in the thickness of the investigated object. Simplified model is used that allows finding the optimal operating point for the given material and thickness without an apriory knowledge about the X-ray spectra, detector response and the material composition. It is shown that in case of small changes of thickness, the optimum is met when the detected intensity behind the object of certain thickness is at approx. 37 % of the full range (i.e., of the value that would be measured under the same conditions in the absence of the object). In spite of simplifications made, the theoretical model shows a very good correspondence with the experimental data. A brief consideration is made on the case of a general difference in thicknesses.
Research report 2013-11-08 Calcite_S12
Kumpová, Ivana ; Vopálenský, Michal ; Vavřík, Daniel
Porosity was measured on a irregular sample of calcite, designated Calcite_S12, using the TORATOM device in the Centre of Excellence Telč.
Research report 2013-11-19 Calcite_S11
Kumpová, Ivana ; Vopálenský, Michal ; Vavřík, Daniel
Porosity was measured on a irregular sample of calcite, designated Calcite_S11, using the TORATOM device in the Centre of Excellence Telč.
Research report 2013-11-19 Calcite_S43
Kumpová, Ivana ; Vopálenský, Michal ; Vavřík, Daniel
Porosity was measured on a irregular sample of calcite, designated\nCalcite_S43, using the TORATOM device in the Centre of Excellence Telč.\n
Research report 2013-11-10 Calcite_SS3
Kumpová, Ivana ; Vopálenský, Michal ; Vavřík, Daniel
Porosity was measured on a irregular sample of calcite, designated Calcite_S43, using the TORATOM device in the Centre of Excellence Telč.

National Repository of Grey Literature : 13 records found   1 - 10next  jump to record:
Interested in being notified about new results for this query?
Subscribe to the RSS feed.