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Navratilova E.,Institute of Scientific Instruments of the CAS | Rovnanikova P.,Brno University of Technology
Construction and Building Materials | Year: 2016

The article deals with the evaluation of six brick dusts which were characterized regarding their chemical and mineralogical composition, amorphous phase content, granulometry and specific surface area. The pozzolanic activity was determined by the modified Chapelle test. The analysed brick dusts were used to prepare modified lime mortars in which lime hydrate was replaced by 50% of brick dust. The flexural and compressive strengths of the mortars were determined and pozzolanic activity was calculated from the compressive strengths. The pozzolanic activity of brick dusts is dependent in particular on their amorphous phase content, particle size distribution and specific surface area. Pozzolanic activity increases with increasing amorphous phase content in the brick dusts. Pozzolanic activity has an effect on the strength of modified lime mortars. The higher is the pozzolanic activity value of the added brick dust the higher are the initial and long term strengths of the modified lime mortars. © 2016 Elsevier Ltd. Source

Mocioiu V.,Autonomous University of Barcelona | Mocioiu V.,CIBER ISCIII | Ortega-Martorell S.,CIBER ISCIII | Ortega-Martorell S.,Liverpool John Moores University | And 8 more authors.
BMC Bioinformatics | Year: 2015

Background: Magnetic resonance spectroscopy provides metabolic information about living tissues in a non-invasive way. However, there are only few multi-centre clinical studies, mostly performed on a single scanner model or data format, as there is no flexible way of documenting and exchanging processed magnetic resonance spectroscopy data in digital format. This is because the DICOM standard for spectroscopy deals with unprocessed data. This paper proposes a plugin tool developed for jMRUI, namely jMRUI2XML, to tackle the latter limitation. jMRUI is a software tool for magnetic resonance spectroscopy data processing that is widely used in the magnetic resonance spectroscopy community and has evolved into a plugin platform allowing for implementation of novel features. Results: jMRUI2XML is a Java solution that facilitates common preprocessing of magnetic resonance spectroscopy data across multiple scanners. Its main characteristics are: 1) it automates magnetic resonance spectroscopy preprocessing, and 2) it can be a platform for outputting exchangeable magnetic resonance spectroscopy data. The plugin works with any kind of data that can be opened by jMRUI and outputs in extensible markup language format. Data processing templates can be generated and saved for later use. The output format opens the way for easy data sharing- due to the documentation of the preprocessing parameters and the intrinsic anonymization - for example for performing pattern recognition analysis on multicentre/multi-manufacturer magnetic resonance spectroscopy data. Conclusions: jMRUI2XML provides a self-contained and self-descriptive format accounting for the most relevant information needed for exchanging magnetic resonance spectroscopy data in digital form, as well as for automating its processing. This allows for tracking the procedures the data has undergone, which makes the proposed tool especially useful when performing pattern recognition analysis. Moreover, this work constitutes a first proposal for a minimum amount of information that should accompany any magnetic resonance processed spectrum, towards the goal of achieving better transferability of magnetic resonance spectroscopy studies. © 2015 Mocioiu et al. Source

Bok J.,Institute of Scientific Instruments of the CAS | Lalinsky O.,Institute of Scientific Instruments of the CAS | Hanus M.,Charles University | Onderisinova Z.,Charles University | And 2 more authors.
Ultramicroscopy | Year: 2016

Single crystal scintillators are frequently used for electron detection in scanning electron microscopy (SEM). We report gadolinium aluminum gallium garnet (GAGG:Ce) single crystalline films as a new perspective scintillators for the SEM. For the first time, the epitaxial garnet films were used in a practical application: the GAGG:Ce scintillator was incorporated into a SEM scintillation electron detector and it showed improved image quality. In order to prove the GAGG:Ce quality accurately, the scintillation properties were examined using electron beam excitation and compared with frequently used scintillators in the SEM. The results demonstrate excellent emission efficiency of the GAGG:Ce single crystalline films together with their very fast scintillation decay useful for demanding SEM applications. © 2016 Elsevier B.V. Source

Mikmekova E.,Institute of Scientific Instruments of the CAS | Frank L.,Institute of Scientific Instruments of the CAS | Mullerova I.,Institute of Scientific Instruments of the CAS | Li B.W.,Ulsan National Institute of Science and Technology | And 2 more authors.
Diamond and Related Materials | Year: 2016

Scanning electron microscopy with very slow electrons offers a novel tool enabling one to image the graphene samples at nanometer or even sub-nanometer lateral resolution in transmitted as well as reflected electrons and to count reliably the atomic layers in both imaging modes. The study was performed on graphene prepared by chemical vapor deposition on thin copper foil. Observation by slow electrons has also confirmed the underlayer mechanism of nucleation and growth bellow already existing graphene layers on copper. Moreover, electrons with impacted energy below 100 eV can be used for "cleaning" of a material. It leads to elimination of the contamination process during the measurement, which enables to observe the predicted oscillations in reflection mode and to measure the transmissivity of various stacks of layers in transmission mode down to units of eV. © 2015 Elsevier B.V. All rights reserved. Source

Nedela V.,Institute of Scientific Instruments of the CAS | Hrib J.,Institute of Scientific Instruments of the CAS | Havel L.,Mendel University in Brno | Hudec J.,Institute of Scientific Instruments of the CAS | Runstuk J.,Institute of Scientific Instruments of the CAS
Micron | Year: 2016

This article describes the surface structure of Norway spruce early somatic embryos (ESEs) as a typical culture with asynchronous development. The microstructure of extracellular matrix covering ESEs were observed using the environmental scanning electron microscope as a primary tool and using the scanning electron microscope with cryo attachment and laser electron microscope as a complementary tool allowing our results to be proven independently. The fresh samples were observed in conditions of the air environment of the environmental scanning electron microscope (ESEM) with the pressure from 550 Pa to 690 Pa and the low temperature of the sample from -18 °C to -22 °C. The samples were studied using two different types of detector to allow studying either the thin surface structure or material composition. The scanning electron microscope with cryo attachment was used for imaging frozen extracellular matrix microstructure with higher resolution. The combination of both electron microscopy methods was suitable for observation of "native" plant samples, allowing correct evaluation of our results, free of error and artifacts. © 2016 Elsevier Ltd. Source

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