Search Results

You are looking at 1 - 10 of 13 items for

  • Author or Editor: Z. I. Szabó x
Clear All Modify Search

Finslersche Projektivgeometrie. I

Eine Globale Begründung der Finslerschen Projektivzusammenhänge

Acta Mathematica Hungarica
Author: Z. I. Szabó
Restricted access

Finslersche Projektivgeometrie. II

Über Finslersche Projektivbündel mit Weylscher Projektivkrümmung Null

Acta Mathematica Hungarica
Author: Z. I. Szabó
Restricted access
International Review of Applied Sciences and Engineering
Authors: I. Fazekas, Gy. Szabó, Sz. Szabó, M. Paládi, G. Szabó, T. Buday, Z. Túri and A. Kerényi

Abstract

The aim of our report is to refer on the actual state of small biogas power plants in Hungary summarising the increase in their number and capacity and their effects on climatic change. The above is based on the CO2 emission of the energetic utilization of biogas and the calculation of its ecological footprint that were compared to the environmental effects of natural gas energetic utilization. The aim of this paper does not include the complete life cycle analysis therefore the environmental benefits of the energetic utilization of biogas produced from various raw material are presented via only the direct CO2 emission of the production process.

Restricted access

The first steps in studies on the female and male gametophytes of wheat involved the light microscope analysis of semi-thin sections of embryo sacs containing egg-cells developing in planta. The information thus obtained on the development of the egg-cell from its initial formation to maturity contributed to the successful isolation of egg-cells. The morphological and ultrastructural details of egg-cells isolated 3, 6, 9, 12, 15 and 18 days after emasculation were examined to determine the function of the female gametophyte and its suitability for micromanipulation. A sufficient number of gametoplasts in the right stage of development are required for the successful microinjection and in vitro fusion of egg-cells and male gametes. No data are yet available on the fusiogenicity of wheat egg-cells in various stages of development. Various in vitro fertilisation and microinjection techniques could be of service in gamete fusion experiments aimed at the creation of interspecific and intergeneric hybrids which do not occur in nature due to sporophytic incompatibility. The results acquired in investigations on immature embryos can be used for the study of embryos developing from egg-cells fertilised in vitro.

Restricted access

The nucleus accumbens (NAcc), an important basal forebrain structure, has a central integratory function in the control of feeding and metabolism. The primary cytokine interleukin-1β (IL-1β) exerts its neuromodulatory effects on the endocrine functions both centrally and peripherally. The present study was designed to elucidate the possible consequences of direct administration of IL-1β into the NAcc on the endocrine regulation of metabolism. Plasma concentrations of insulin and leptin, two key hormones in the homeostatic control were determined 15 minutes after a single bilateral microinjection of IL-1β into the NAcc of adult male Wistar rats, and the effects were compared with those found in vehicle treated control animals. Insulin plasma levels of the cytokine treated animals were significantly higher than those parameters of the control rats. No differences were found in leptin plasma concentrations between the two groups. Our findings show that IL-1β mediated processes in the NAcc have important roles in the central neuroendocrine control.

Restricted access

In the case of a widely used spice — Origanum vulgare subsp. hirtum — the effect of different drying methods (natural, and by using dryers at temperatures of 30°C, 40 °C, 45°C) was investigated referring to the essential oil amount and composition in the final material. The sensory characteristics of olive oils flavoured by the oregano samples were also determined. The essential oil amount and the area percentage of its main component — carvacrol — were significantly influenced by the different drying temperatures. Compared to the natural way of drying in the case of the essential oil content the drying temperature of 40°C and 45°C was preferable for the higher amounts. Referring to the carvacrol area percentage the drying temperature of 30°C resulted in the highest amounts (89.74±0.28%), that was affirmed by the sensory analysis as well; based on the taste descriptions the consumers found it the most pungent one. According to our results sensory analysis data in most of the cases corresponds to the GC-MS measurements and give a much more complex characterisation of a spice.

Restricted access

Abstract

Rotational atherectomy (RA) is an advanced coronary debulking technique, often used in cases, where traditional percutaneous coronary intervention (PCI) methods (e.g. balloon predilatation, use of cutting balloons, direct stenting etc.) are inadequate. We report a case of a male patient, who previously underwent PCI of the right coronary artery (RCA) and was free of chest pain for several weeks, but his clinical symptoms have developed again. Angiography showed a “de novo”, highly calcified left anterior descending (LAD) lesion that, after high-pressure balloon inflation, failed to dilate, thus the intervention was suspended. RA was scheduled for the patient within one month. As a complication of the previous LAD dilatation attempt, a chronic dissection of the target lesion occurred. Problems arose during the direct wiring attempt of the main vessel and the true lumen was only found via plaque modification, after accessing a small septal branch. Accessing the true lumen was only possible by using a conventional cross-wire. This was exchanged to a RA wire, with the help of an over-the-wire (OTW) balloon catheter. RA and debulking of the target lesion was performed. An everolimus-eluting stent (BioMatrix, Biosensors Europe, Morges, Switzerland) was implanted, with excellent results. The patient is free of clinical symptoms since the intervention, which took place 14 months ago.

Restricted access

Abstract  

Mössbauer spectroscopy was used to study phlogopites from ultramafic xenoliths derived from alkali mafic rocks of the Transdanubian Midmountains. On the basis of evaluation of the Mössbauer spectra the following iron sites were identified /using the nomenclature published by Dyar1/ in the samples:

\documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{upgreek} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} $$Fe_{M1}^{2 + } , Fe_{M2}^{2 + } , Fe_{M3}^{3 + } and Fe_{tet}^{3 + } .$$ \end{document}
Quantitative analysis of all of the iron sites was performed. The Fe2+/Fe3+ ratio was found to be 3.33 for the sample for phlogopite xenolith and 2.05 for the sample from clinopyroxene-phlogopitite xenolith. There are evidences, that Fe3+ can occupy tetrahedral positions in upper mantle phlogopite, even if Si+Al>8. Our data suggest MARID+ glimmerite origin of micas.

Restricted access

Summary  

Thirty-seven episodes of dust intrusion were observed between February 12, 1991 and August 31, 2000 in the Hungarian atmosphere and found to be of Saharan origin. They have been assigned to typical source areas in Northern Africa selected by systematic investigations related to the Mediterranean Basin. Elemental concentrations and regional signatures deduced from PIXE analysis, total suspended particle mass, and black carbon mass have been measured on dust samples collected in Debrecen, Hungary. These data combined with Aerosol Index data, and dust plume axes obtained from TOMS data from NASA satellites were used for assigning the most probable source areas of the dust transported to the sampling site. Our data and conclusions are in accordance with other published investigations on the predominant role of Saharan dust emission in building up the aerosol load of the global atmosphere.

Restricted access

Abstract

The beneficial effects of hippotherapy lie in the transmission of the horse's movements to the patient. The aim of our work was to create a measurement method for objective evaluation that can be used in natural settings without interfering with therapy.

Methodology/Principal findings

Our measurement system consists of three treble axis accelerometers connected to a data logger. Software was developed for data analysis and post processing. A commercial DVD recording camera was used to document the hippotherapy session. In this paper we present the results obtained in pilot measurements on ten children with cerebral palsy. For reference, a skilled rider was measured on the same horse using a passive following seat.

Conclusions

The acceleration diagrams show common characteristics useful to the interpretation of the movement transfer during hippotherapy as well as individual patterns indicating alterations in the movement reactions of different patients.

Restricted access