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– 507 , 1988 . [3] H. J . Broersma and H . Tuinstra . Independence trees and Hamilton cycles . J. Graph Theory , 29 : 227 – 237 , 1998 . [4] A . Czygrinow , G . Fan , G . Hurlbert , H. A . Kierstead , and W. T . Trotter . Spanning
, 14, 575–589. Bopp , K. L., Verhaeghen , P. (2005) Aging and Verbal Memory Span: A Meta-Analysis. The Journals of Gerontology Series B: Psychological Sciences and Social Sciences, 60, 223
REFERENCES [1] H . Broersma and H . Tuinstra . Independence trees and Hamilton cycles . J. Graph Theory 29 : 227 – 237 , 1998 . [2] Y . Chen , G . Chen , and Z . Hu . Spanning 3-ended trees in k -connected K 1,4 -free graphs . Sci
References [1] Y . Chen , P. H . Ha and D. D . Hanh . Spanning trees with at most 4 leaves in K 1 , 5 -free graphs . Discrete Math , 342 : 2342 - 2349 , 2019 . [2] R . Gould , W . Shull . On spanning trees with few branch vertices
Abstract
Studies on the life-span of past scientists according to data of theChronicle of Major Events of Natural Sciences have found that the age of optimum peak value of scientific discovery is about half the peak value of their life-span. Achievements of those scientists who made a name before 25 years old are 44 percent more than average and their life efficiency is 1.7 times that of the average. Therefore it is an effective measure to train prococious scientists for a nation in her strive to catch up with or surpass world level in science.
Abstract
A narrow span (E
o
±0.1 V) controlled potential coulometric method has been developed for the determination of neptunium in 1M H2SO4 with a RSD of 0.2%. The main advantage of this method over the existing coulometric methods is that it can tolerate up to a 5-fold excess of plutonium. The method involves carrying out the electrolysis to about 97% and calculating by an iterative computation the formal electrode potential in situ, which is used to calculate the total amount present in the sample. The method consists in oxidation of all the neptunium to Np (VI) by Ce(IV), destruction of excess Ce(IV) and reduction of Np(VI) to Np(V) by NaNO2, destruction of excess nitrite by sulfamic acid followed by coulometric titration of Np(V) to Np(VI).
We show that in almost every random graph process, the hitting time for havingk edge-disjoint spanning trees equals the hitting time for having minimum degreek.
Abstract
The aim of this research is to gain an insight into international recognition of the STM (Science, Technology, and Medicine) Croatian journals measured by citations in SCI-expanded database. The sample for the research was a citation analysis of 142 journals in time span 1975–2001 for papers published in 1975–1998. More than 90% of those journals are not indexed by SCI-expanded. For the purpose of this research we introduced a new scientometric indicator Normalized number of Citations per 100 Papers (NCP) that allows us direct comparison of the journals from various categories (NCP = 100C/P / IF1989). We chose the year 1989 as a mean value for time span 1975–2001. By citation analysis we established the influence of errors on recognition of Croatian journals and their articles. Obtained results show that an article-to-article link is not found for 32% of cited items. The most frequent type of error is journal title, 37%, which indicates that approximately one third of Croatian journals can not be found when searching by journal title only. Some Croatian journals, even not indexed by SCI-expanded, showed relatively high rank in an impact, i.e. their NCP is higher than 100, and number of citations per paper is higher than 1.
mycotoxin extract . Can. J. Plant Pathol. 39 , 444 – 453 . 33. Španic , V. , Lemmens , M. , Drezner , G. ( 2013 ) Variability of components of Fusarium head blight
Summary
Identification of closely related plant species is not a trivial task, and is often difficult on the basis of morphological or anatomical features. To differentiate among analyzed species, a chromatographic fingerprint is usually constructed. This is not easy for very complex samples, however, especially those containing substances spanning a wide polarity range. In such circumstances more than one fingerprint is constructed, e.g. one for polar and the other for apolar constituents. In this paper a new method has been used for resolution of a mixture of 17 coumarins and flavonoids and, subsequently, construction of a fingerprint of closely related species belonging to the Peucedanum genus. This is the first time multidimensional planar chromatography has been applied for such purpose. Distinctive fingerprints are produced for every analyzed plant species, without the need to construct two fingerprints and without the application of more sophisticated multidimensional methods (e.g. hyphenation of HPLC and TLC, HPLC-MS, etc).
