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19.003  Articles
1 of 1.901 pages  |  10  records  |  more records»
The paper goal was to measure the content of bioactive substances, such as hypericins, some flavonoids and hydroxycinnamic acids, and concentrations of chemical elements, including essential macro- (K, Mg and Na), microelements (Zn, Mn, Cu, Fe, Cr, Ni and... see more

A semi-empirical model of carrier recombination accounting for hole localization by composition fluctuations in InGaN alloys is extended to polar and nonpolar quantum-well structures. The model provides quantitative agreement with available data on wavele... see more

The article clarifies the peculiarities of the development of vegetation that is formed on the rock dumps of the Southern Mining and Processing Plant or their rock components (lithoecotopes), that is, only lithophilic vegetation. The problem of researchin... see more

Human activity has disturbed the functioning of river ecosystems all around the globe. The current global climatic fluctuations and local anthropogenic impact lead to rearrangement in the structure and functioning of aquatic communities. One of the most i... see more

Climatic changes observed around the world in recent years are associated with an increase in the solar radiation intensity and temperature and reduction in the humidity. Fluctuations of environmental factors significantly change the conditions for the ex... see more

Compositional and textural attributes of the surficial sediment in deltaic settings typically differ from the sediment load carried by their source rivers. This phenomenon is evaluated here by semiquantitative study of the variability of petrologic charac... see more

AbstractChanges in vegetation cover and species composition in a grassland community during a six year period are reported. The grass Themeda triandra and the dwarf shrub Helichrysum rosum decreased in abundance, whereas the grass Eragrostis obtusa increa... see more

The most accepted definition of biodiesel is stated at the EU technical regulation EN 14214 (2008) or in the USA in ASTM 6751-02. As a result of this highly strict description only methyl esters of fatty acids conform to these definitions, nevertheless th... see more

The methods for determination of spectral composition of random functions of voltage and current of traction substation feeder are proposed. The low frequency components of their spectra (interharmonics) are obtained.

1 of 1.901 pages  |  10  records  |  more records»