Search Results

You are looking at 1 - 2 of 2 items for

  • Author or Editor: N. T. Nikolić x
  • Refine by Access: All Content x
Clear All Modify Search
Acta Mathematica Hungarica
Authors:
Lj. B. Ćirić
,
Lj. B. Ćirić
,
Lj. B. Ćirić
,
N. T. Nikolić
,
N. T. Nikolić
,
N. T. Nikolić
,
Ume J. S.
,
Ume J. S.
, and
Ume J. S.

Summary  

Recently, Pathak [13] has made an extension of the notion of compatibility to weak compatibility, and extended the coincidence theorem for compatible mappings in Kaneko and Sessa [11] to weakly compatible mappings [13]. In the present paper, we define a new class of weakly compatible mappings (Definition 4) and prove some common fixed point theorems for these mappings, which satisfy Condition (2) below. Although our main theorem is formulated for weakly compatible mappings, its corresponding formulation for commutative mappings is also a new result, thus presenting a generalization of some theorems of Fisher, Das and Naik, Khan and Kubiaczyk, Reich, Ćirić and Rhoades and Watson.

Restricted access
Acta Chromatographica
Authors:
D. Trbović
,
T. Polak
,
L. Demšar
,
N. Parunović
,
M. Dimitrijević
,
D. Nikolić
, and
V. Đorđević

With the aim to reinforce laboratory competence in the field of testing the quality of fish from aquaculture, a study on the precision of fatty acid (FA) analyses in fish meat and fish feed was undertaken. Different methods were performed in laboratories. In situ transesterification method and extraction of lipids from the fish were followed by capillary gas chromatography with flame ionization detection. The reproducibility (R) values of the majority of FAs were less than 3% of their absolute values. Differences in calculating ionization detector response factors and/or autoxidation caused by faulty sample-handling could lead to variation in quantification of FAs in fish, especially for FA C22:6n-3. Statistical analysis showed a significant correlation between the two laboratories' quantifications of FAs in fish and fish feed (Pearson's correlation coefficient; r = 0.987, r = 0.994, and r = 0.997; for fish Z [trout], fish Š [rainbow trout], and fish feed, respectively). Overall, adequate accuracy was obtained in this study. The proposed method provides a fast and efficient means of identifying fish and feed for quality control purposes.

Open access