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Number of results: 4
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Abstract

Leguminous plant products have great nutritional and economic importance in the European Union, which is reflected by its protein policy. These harvested yields are risked by stored product pests, such as Acanthoscelides obtectus Say, which can cause up to 50–60% loss in stored bean items. The bean weevil causes both quantitative and qualitative damage to seeds. We aimed to map the qualitative damage of this devastating pest, which deteriorates the nutritional content of bean kernels. Furthermore, our purpose was to determine accurately the decrease in the volume and density alteration in beans caused by this important stored product pest using CT-assisted imaging analysis. Our results showed that the nutritional arrangement in damaged beans was caused by A. obtectus. The measured nutrient content increment in damaged samples can be explained by the presence of extraneous organic material which originates from perished specimens of the bruchin pest. This is a negative phenomenon in bean items used as forage, because of the loss of valuable proteins and rancidity in herbal oils. Weight loss triggered by developing larvae was 49.42% in examined bean items. The use of 3D technologies has greatly improved and facilitated the detailed investigation of injured seeds. The density (75,834 HU; 41.93%) and the volume (296.162 mm3; 26.21%) values measured by CT of the examined samples were significantly decreased. The decreasing of tissue density in damaged beans can be accounted for by the consumption of starch present at a high ratio and that of the dense reserve components in the cotyledons.
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Authors and Affiliations

Sandor Keszthelyi
Egri Helga Bosnyakne
David Horvath
Adam Csoka
Gyorgy Kovacs
Donko Tamas
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Abstract

Since the 1970s, social psychology has investigated real human behavior to an increasingly smaller degree. The author of the article suggests that the phenomenon of cognitive revolution in psychology naturally boosted the interest of researchers in such phenomena like attitudes, values, social judgments and stereotypes; at the same time, it decreased interest in others important topics like aggression, social influence or altruism. In recent decades, we have also witnessed a growing conviction among social psychologists that explaining why people perform certain actions holds greater importance that demonstrating the conditions under which people really display particular reactions. The key question appears in this situation of whether social psychology remains of science of (real) behavior, and whether the current condiction of the discipline is desirable or rather pathological.

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Authors and Affiliations

Dariusz Doliński
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Abstract

In this work, the 316L austenitic steel based milled and sintered composites with 0.33 wt% and 1 wt% SiC ultra-fine particles addition have been prepared. The high efficient attrition milling provided an efficient size reduction of the 316L steel grains and homogeneous distribution of the SiC nanoparticles before sintering process. Spark plasma sintering (SPS) was used for compaction of milled powder mixtures. The effect of SiC addition on the milling efficiency and the structure of the composites have been studied. It was found that the amount of ceramic addition did not influence the efficiency of milling process, powder mixtures with flake like grains have been obtained. On the other hand, the intensive milling assured an optimal coverage of 316L stainless steel grains with submicron sized ceramic particles in both cases. The sintered composites showed high densities with the presence of small amount of closed porosities. Structural, mechanical and tribological examinations of 316L/SiC composites have been performed and presented.

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Authors and Affiliations

Haroune Rachid Ben Zine
Filiz Cinar Sahin
Zsolt Czigány
Katalin Balázsi
Csaba Balázsi
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Abstract

In this paper we analyze the phenomenon of quitting academic science and show how quitting differs between men and women, academic disciplines and over time. The approach presented is comprehensive: global, based on cohorts of scientists, and longitudinal – we observe the publication activity of individual scientists over time. Using metadata from Scopus, a global bibliometric database of publications and citations, we analyze the publication careers of scientists from 38 OECD countries who began publishing in 2000 ( N = 142 776) and 2010 ( N = 232 843). The paper tests the usefulness of large bibliometric datasets for a global analysis of academic careers.
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Authors and Affiliations

Marek Kwiek
1
ORCID: ORCID
Łukasz Szymula
2
ORCID: ORCID

  1. Institute for Advanced Studies in SocialSciences and Humanities (IAS), Uniwersytet im. Adama Mickiewicza w Poznaniu
  2. Wydział Matematyki i Informatyki, Uniwersytetim. Adama Mickiewicza w Poznaniu

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