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2892 documents, page 1 of 290

Effect of working parameters and nozzle wear rate onto the spray quality in use of different fan flat nozzle

The subject of the analysis was the influence of working parameters (working pressure and working speed) on +drop tracks size and changes in flow rate level from flat fan nozzle. New nozzles and nozzles after laboratory wear were tested. The influence of nozzles wear on +drop tracks size was examined. It was found that increase in liquid flow rate results in higher values of mean diameter of +drop track. Increase in working pressure or working speed cause decrease in +drop tracks size and red...

A component model of methods for evaluation of the quality in education

Report published in the Proceedings of the National Conference on "Education in the Information Society", Plovdiv, May, 2013 The paper proposes a component model of criteria systems for evaluation of the quality in education. In it the logic of managing the hierarchical model of the criteria system is separated from the management of functionality, necessary for the different types of evaluative elements, user roles and application cases. The model has been used in building an ...

Weed problem on the newly established prairie cordgrass (Spartina pectinata) plantations intended for energetic purposes

In our research conducted in years 2009-2011 three herbicides were examined in the respect of their usefulness at the plantation of prairie cordgrass (Spartina pectinata) intended for energetic purposes. In the light of the conducted observations, it seems that selectivity of particular herbicides for prairie cordgrass plants and their effectiveness on particular weed species depend mainly on the growing phase of the plants as well as on particular weed species.

GRASS SPECIES FROM C-4 CARBON FIXATION GROUP: POLISH EXPERIMENT WITH A NOVEL ENERGY AND FORAGE PURPOSES CROP

Experiment was conducted during four years 2003-2006. Materials used were three genus grass species of C-4 photosynthesis: Andropogon gerardi Vitman, Panicum virgatum L. and Miscanthus sacchariflorus (Maxim.) Hack. Plants were planted at spring 1998. Agrotechnical part of experiment was conducted in Botanical Garden of Plant Breeding Acclimatization Institute in Bydgoszcz and analytical part in Department of Animal Nutrition and Feed Management, Faculty of Animal Breeding and Biology of Unive...

A New Locality of the Italian Wall Lizard Podarcis siculus (Rafinesque-Schmaltz, 1810) from Turkey

The current paper reviews the current distribution of the Italian Wall Lizard (Podarcis siculus) in Turkey. A new locality at Güzelyalı Belediyesi Resort, south-west of Mudanya City in the country is reported.

PROBLEM OF RISK ELEMENTS ACCUMULATION IN CEREAL RAW MATERIALS AND FOODSTUFFS

Four kinds of cereals- wheat (Triticum aestivum L.), barley (Hordeum sativum L.), triticosecale (Triticosecale sativum L.) and oat (Avena sativa L) were taken from risk region of Slovakia in order to determine risk elements content in individual parts of grain. The results indicate significant differences in the content of the risk elements in four mill streams. Among observed cereals the highest content of risk metals decreased in order: oat>barley>triticosecale >spring wheat>win...

Direct PCR as the platform of Hedera helix, L. genotypying without the extraction of DNA

Hedera helix, L. is a specie that is used for its ornamental and medicinal properties widely. In spite of its very good biochemical characterization, the knowledge about the DNA variability is very limited and no DNA markers were used to analyse the genomic variability of the ivy populations, up to date. Here, a direct PCR approach was used to evaluate a cytochrome P450 sequences based polymorphism by PBA technique. A set of 4 samples from Slovakia, 2 samples from Czech Republic, 2 samples or...

The Library "Venets" [In Bulgarian]

The Library "Venets" is an electronic application to the Belogradchik Daily Illustrated Edition

Word Association Test for Studying Conceptual Structures of Teachers and Students

The paper presents the use of a free word association test for revealing the scientific conceptual structures of teachers and students, concerning two stimulus words – living cell and biodiversity. The stimulus words retrieve a cluster of associations most of which are based on science education and are studied as connected. Associations with the stimulus words are analyzed and classified according to predetermined criteria. The stimulus word ‘living cell’ was quantitatively assessed in order...