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  • Author: George Constantin x
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Abstract

The study of entrepreneurial intentions has become a topic of interest in the last decades. As most of the decisions to launch a new firm are assumed to be planned for some time, it means that they are preceded by an intention to do so. Thus, identifying and analyzing the factors that influence the entrepreneurial intention represents a key issue in the entrepreneurship research. A review of the scientific literature shows that the determinants of entrepreneurial intentions are to be found in both the psychological approach and the behavioral approach. The psychological approach stresses the importance of various factors such as the locus of control, the propensity to take risk, the self-confidence, the need for achievement, or the innovativeness. On its turn, the behavioral approach puts accent on other elements such as the subjective norms or the personal attitude. The purpose of the paper is to identify and analyze the determinants of entrepreneurial intentions in the case of the Romanian entrepreneurs located in the Southern part of the country. In this respect, it takes into account several factors such as gender, experience or propensity towards risk. The methodological approach was based on a quantitative research method. The method of data collection was a survey by self-administered questionnaire. The paper illustrates the existence of various correlations between the above factors and the entrepreneurial intentions. It contributes to the enrichment of the scientific literature by emphasizing the role played by some of the main determinants of entrepreneurial intentions in the developing of entrepreneurship in Southern Romania.

Abstract

In this study the dyes used are Basic fuchsin and Methylene blue. The adsorption was studied in relation to the metal in the ferrite, time of exposure and dye concentration. The highest adsorbtion capacity was observed for MgFe2O4 at a dye concentration of 0.06 mM, adsorption percent of 88% in 3 hours. Desorption was also studied by redispersion in ethanol. The main adsorption mechanism is thought to be through electrostatic interaction, mainly due to surfactant groups present on the nanoparticles. The nanoparticles have ferromagnetic behavior under magnetic field which allows for effective separation.

Abstract

In this paper is presented a model of locomotion system with omnidirectional wheels for mobile platforms for the industrial environment. In the first part of the paper is made a brief description of the type of wheels used, what are their advantages and disadvantages. In the paper the emphasis is placed on omnidirectional wheels of Mecanum type and all their possibilities of movement are presented. Also presented is the design and sizing of a complete locomotion system for an omnidirectional mobile platform that serves the industrial environment. The chosen kinematic scheme and the calculation of the dimensioning of the necessary motors, the determination of the forces acting on the platform when moving in horizontal plane and the determination of the forces acting on the platform when moving on the ramp are presented.

Abstract

This paper presents a brief description of the main systems found in a platform or in an autonomous omnidirectional mobile robot. Each system is described and presents its important role for the functionality of the robot and what are the advantages and disadvantages of using these systems. Concrete examples are presented for the omnidirectional locomotion system, the kinematics of the omnidirectional locomotion, the sensory system of the robot and the navigation systems that can be implemented. The paper wants to highlight the main systems that we must take into account in creating an autonomous mobile robot with omnidirectional wheels.

Abstract

Creative economies are at the heart of the knowledge-based economy. The main objectives of the study are to present the spatial design of the regional systems of creativity in Romania and to identify the evolutionary trends, by creating spatial models for key economic indicators, specific to such economic activities. This paper focuses on how creative economies are concentrated in the national network of settlements and how they differentiate in terms of regional profile. Consequently, a yearly nationwide database was created for 2000-2012, which includes four-digit creative economic activities, according to the Classification of National Economy Activities, for each administrative unit in Romania. The analyses, conducted for the same period, show a concentration of creative economies as a national polycentric network which includes the capital city and cities with over 300,000 inhabitants, as well as their structured territorial systems emerging around them, representing the local and regional polycentric networks. The analysis of the economic profiles highlights the growing share of creative economies in the national economy that tends to contribute more and more to the increase of the operational complexity of the local and regional economies.