The socialist network

We develop and test machine learning-based tools for the classification of personal relationships in biographical texts, and the induction of social networks from these classifications. A case study is presented based on several hundreds of biographies of notable persons in the Dutch social movement. Our classifiers mark relations between two persons (one being the topic of a biography, the other being mentioned in this biography) as positive, neutral, or unknown, and do so at an above-baseline level. A training set centering on a historically important person is contrasted against a multi-person training set; the latter is found to produce the most robust generalization performance. Frequency-ranked predictions of positive and negative relationships predicted by the best-performing classifier, presented in the form of person-centered social networks, are scored by a domain expert; the mean average precision results indicate that our system is better in classifying and ranking positive relations (around 70% MAP) than negative relations (around 40% MAP).     

Calibration of Fluxset sensors for the measurement of spatially strongly inhomogeneous magnetic fields

A procedure developed for the calibration of a magnetic sensor in spatially strongly inhomogeneous magnetic field is presented in this paper. Assuming that the sensor is linear and it does not significantly disturb the magnetic field to be measured, its output signal is approximated as the weighted sum of the field values calculated theoretically around the sensor. The weighting coefficients are obtained by finding the best fit of the actual experimental output and the theoretical prediction of the measured field in the least square sense. Using the presented procedure, sensors can be calibrated for the measurement of spatially strongly inhomogeneous magnetic fields, consequently such sensors can be applied to get the field distribution map of inhomogeneous fields.     

The coloroid color system

Developed over two decades at the Technical University, Budapest, the Coloroid color system is an aesthetically uniform system, in which scales of hue, saturation, and lightness appear to change uniformly over their entire length, when viewed as a whole. This is not the same as perceptually uniform in the sense of even intervals of small color differences. This article discusses the concepts and derivation of the Coloroid system, relates it to the Munsell and Ostwald systems, and derives the relations of its coordinates to those of the CIE XYZ system.     

Tubular structures in the endothelia of the retina and in retinoblastoma (author's transl)]

Tubular inclusions in the capillary endothelium were observed in three retinoblastomas. The structure of these inclusions is the same as that observed in the capillary endothelium of the dog's retina.     

Color characteristic of Castle District built on the hill

In this article the used of the colordynamic planning method is described and applied as an example to the façade of a building in Buda. The method of colordynamic planning consists of 3 essential parts. In the first part we decide on the limits of the color range to be used, based upon the requirements of the subject of planning. The decision on these limits is closely linked to the coordinates of the Coloroid system. In the second part the planner creates harmonic color scales from the previously selected color range. In this work he is helped by rules of the Coloroid system, based on harmony thresholds. In the third part the planner selects the color harmony combinations considered suitable by him. Following that, he finalizes the Coloroid coordinates of the proposed colors most suitable for the project. For the presentation of the colordynamic planning method, based on the Coloroid system, we use a real database of a colordynamic plan, which was awarded the first prize in an international competition.     

Preference and harmony of neutral colours in 50‐year apart

Within the framework of this article the results of two experiments are compared, on the preference and harmony content of neutral colours, carried out 50‐year apart, in 1967 and 2017. The experimental conditions and sample boards, shown to the experimental subjects were identical in both occasions. Result shows that in 2017 the very light and very dark colours have been preferred over other colours, against the findings in1967. At the same time, the experimental subjects found the colour pairs, formed of colours with higher contrast, more harmonic in 2017 than 50‐year earlier in 1967.     

Thermal reactivity of YBa2Cu3O7-δ with Al2O3 addition in air atmosphere

The high–temperature thermal reactivity of YBa₂Cu₃O_7-δ (Y123) compound with Al₂O₃ addition (0.5–10?wt%) was investigated and the thermal processes were described. Experimentally obtained results showed that Al₂O₃ firstly reacted with Y123 at temperatures far below the peritectic melting point of Y123. During this solid state reaction Al partially diffused into Y123 and formed a solid solution. Also, the formation of Al-rich complex oxides, mainly with barium, and basic secondary phases as Y₂BaCuO₅ and CuO, was observed with increasing Al₂O₃ content. The formation of additional secondary phases with Al₂O₃ provoked their reactivity with Y123 or between themselves. After increasing the temperature of the powder mixtures above the peritectic melting point of Y123 it was found that Al was incorporated in Y123 at higher concentrations than during the solid state reaction. The reason for that could be a partial or full dissolution of Al-rich complex oxides formed at lower temperatures which in turn increased the source of Al for the incorporation in Y123.The thermal behaviour of powder mixtures was investigated with the help of simultaneous differential thermal analysis and thermogravimetry. Morphology and microstructure were examined using powder X-ray diffraction and scanning electron microscopy in combination with energy dispersive X-ray spectroscopy.     

Melt spinning of conducting polymeric composites containing carbonaceous fillers

Fibers produced by melt spinning of conductive polymer composites are attractive for several applications; the main drawback is however reduced processability at high filler concentrations. Carbon nanotubes (CNTs) are considered suitable fillers for conductive polymer composites, replacing conductive grades of carbon black (CB). In this study, the fiber‐forming properties of conductive polymer composites based on a conductive grade of CB and two masterbatches with CNT in a polyethylene matrix were investigated. The CB was also used in a polypropylene matrix for comparison. The rheological properties of the filler‐containing melts in shear and their extensional behavior were evaluated. A piston‐driven device was used to extrude the molten materials through a capillary; different capillary geometries were tested. Fibers were produced at various draw ratios, and their conductivity was determined. To assess the ultimate extensibility, a modified Rheotens method was used. The results showed that a conductive CB grade can have a lower percolation threshold and higher conductivity than a material with CNT. Conductivity decreased with increasing melt draw ratio for both types of fillers. The spinnability of the materials decreased with increasing concentration of filler material and correlations were found between spinnability and melt elasticity. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011