Studia Universitatis Moldaviae. Stiinte Exacte si Economice

9-12

Authors: Vasile BOTNARIUC, Boris CINIC, Andrei COVAL, Petru GAŞIN, Leonid GORCEAC, Simion RAEVSCHI

The influence of high temperature annealing in nitrogen and vacuum of GaN layers deposited by chemical reactions transport (HVPE) in (H2-NH3-HCl-Ga-Al) system on their properties was studied. In the photo¬luminescence (PL) spectra at 300 K of the untreated layers two recombination radiation bands with the plats at 370 nm and 555 nm were revealed. At the layers heat treatment the intensity of the radiation band at 370 nm increases when at the intensity of the yellow band (555 nm) decreases not significantly at the treatment in the both ambiances. It was shown that the electrical parameters could as well be controlled by using heat treatment in nitrogen and vacuum and this depends on the annealing duration.

22-30

Authors: Sergiu CATARANCIUC, Elisei MACOVEICIUC

The article examines the center and median problems on graphs with special structure. In scientific works these are frequently called location problems on graphs. Although efficient solutions for graphs with some well-known properties have been found, in general case the problem remains complex. In this paper the structure of median and center in a d-convex simple planar graph G is studied. We evaluate the connection between median/center of a graph G with mentioned properties and median/center of a tree, determined by G.

36-39

Authors: Andrei POŞTARU, Olga BENDERSCHI

The paper examines the role of specially chosen, exercises and problems, which may contribute especially to the formation and development of probabilistic intuition and thinking. There are presented many classical examples, known paradoxes and original problems. It is examined the methodological part of solving proposed problems.

60-70

Authors: Ion GRECU

A loop is called a middle Bol loop if every loop isotope of satisfies the identity (i.e. if the anti-automorphic inverse property is universal in ) [1]. Middle Bol loops are isostrophes of left (right) Bol loops [2, 4]. The left (right, middle) pseudoautomorphisms of middle Bol loops are considered in the present article. The general form of middle Bol loop’s autotopisms is given using right pseudoautomorphisms of the corresponding right Bol loops. Necessary and sufficient conditions when a LP-isotope of a middle Bol loop is isomorphic to are proved. It is shown that in the left (right) Bol loops every middle pseudoautomorphism is a left (right) pseudoautomorphism. Connections between the groups of pseudoautomorphisms (left, right, middle) of a middle Bol loop and of the corresponding left Bol loop are found.

86-97

Authors: Ran BERGMANN

In the knowledge based information society, to which the modern world is moving, in order to enhance their global business performance, organizations must be careful with the quality of their information since it is one of their main assets. But what are the main dimensions of information quality (IQ), how to ensure the desired quality etc.? The purpose of this paper is to demonstrate the importance of the business information quality assessment, in according to analysis of scientific literature, and to perform a summary of principal dimensions, ways and possibilities for IQ management.

109-113

Authors: Maia BAJAN, Alexandrina CIORCHINĂ, Nicoleta TRUDOV

The degree of awareness towards the relationships between accounting and taxation has reached as new level in the context of the actual deep globalization process, the open markets and the need for connection to certain frames. Given that accountancy and taxation are two independent sciences, the economic activity of entities, state institutions or other autonomous administrative bodies is in the end reflected both in accounting and tax documents. Therefore, it is necessary to analyze them as a whole. Nonetheless, there has always existed the issue of conciliating the two domains, because of the differences among accounting and tax principles for evaluation and economic calculation. Tax principles are generally set as to stimulate or inhibit certain activities. It is obvious that they will not always reflect the true and fair view of the operations taking place within the entity.

122-126

Authors: Наталья ДРАГОМИР

In this paper we analyse the approach to classification of financial assets according to the final version of IFRS-9 "Financial Instruments", published by the IFRS council in July 2014. Specifically, we examine the IFRS-9 in terms of the key changes and differences with respect to both the previous version of IFRS standards and the current IAS-39 "Financial Instruments: recognition and measurement" standard.

131-134

Authors: Ina CAVCALIUC

There are many forms of tourism related to grey nomad tourism, developed independently or complementary, in order to promote tourism tolerance and understanding. These forms appear as a result of personalization of tourism services, determined by different motivations and tourist behavior to each element of tourism product. Such individualization of tourism products is becoming more objective in order to adjust efforts of tourism supply to the potential demand.