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Asociația Ad Astra a anunțat câștigătorii Premiilor Ad Astra 2022: http://premii.ad-astra.ro/. Proiectul și-a propus identificarea și popularizarea modelelor de succes, a rezultatelor excepționale ale cercetătorilor români din țară și din afara ei.
Publicatii proprii
Molecular modelling and spectral investigation of some triphenyltetrazolium chloride derivatives
The molecular parameters of 2,3,5-triphenyl-2H-tetrazolium chloride (TTC) and some compounds based on triphenylformazans (TPFs) — resulting from the enzymatic transformation of TTC, were subjected to comparative investigation on the basis of semi-empirical quantum-chemical simulations, revealing some changes in dipole moment and polarisability in the TPFs in comparison with TTC. Chemical shift due to substituents was discussed using electronic
Read moreWet milling versus co-precipitation in magnetite ferrofluid preparation
Various uses of ferrofluids for technical applications continuously raise the interest in improvement and optimization of preparation methods. This paper deals with preparation of finely granulated magnetite particles coated with oleic acid in hydrocarbon suspensions following either chemical co-precipitation from iron salt precursors or wet milling of micron size magnetite powder with the goal to compare the benefits and disadvantages of each method.
Read moreProcessing and characterization of Al-Mg-Si based Composites Reinforced with Steel
The aim of this paper was to experimental study of obtaining composites with Al-Mg-Si alloy as matrix reinforced with steel in two versions: steel strip of 0.3 mm thick and steel wire (F 0.8 mm). The composites was prepared in an induction furnace at 700-740oC. The casting semi-products composites were than hot-rolled (plastic deformation temperature was 460oC) and heat treated (solution treated at 500oC for 60 minutes and quenched in water (30-50oC)
Read morePhysical-Mathematical Model of Lorentz Factor for the Integrated Intensity of Single Crystal Diffraction
The Lorentz factor is a sensitive issue of X –ray diffraction because it is taking into account some factors witch influence the intensity of diffracted X-radiation, such as: (i) the geometry of the experiment and also (ii) the single crystal or poly-crystals size in the irradiation case of a set of crystallites (crystalline powder) . The difficulty of the subject consists in the possibility of different interpretation of the influence of these
Read moreA numerical dynamic behaviour model for 3D contact problems with friction
ABSTRACT This paper proposes a novel algorithm for the condition detection in which the slip state transitions in a stick-slip motion, or the solution breaks down and also to study the state transition of nodes belonging to the contact area: stick, slip or open contact state. We designed a Matlab Simulink program to simulate the occurrence conditions for the slip-stick transition analysing three types of contact surface materials, with respectively
Read moreCurrent Directions of Research and Trends in Economic Science
The paper aims to assess the main theoretical evolutions and directions of research in contemporary economic science. To this aim, we set off with an analysis of the highest distinction in economics, the Nobel Prize for Economic Science. The analysis reveals a strong focus on theoretical, formal approaches – particularly mathematical formulation – but also quantitative methods – particularly econometrics. Other important features include the
Read moreThe communication process in the business environment. Economic and Moral principles from the perspective of sustainable development.
The economic communication is more than a decade a point of interest due to the communication supports development and the diversity of information, on one hand, and due to the need for documentation and knowledge, both at the individual level and at the level of society, on the other hand. Thus the freedom into thinking and expression led to the development of communication activities and collecting them in a new vision. The process of communication
Read moreEconomic principles and moral values of the communication process in the context of sustainable development
In the last decade of the XXth century, freedom of thought and expression has led to the development of communication activities and their perception from a new perspective. The beginning of the XXI century accentuated this trend, so that communication has become, in a relatively short time, one of the engines of the economy, but also an integral part of what we want to call today, the psycho-sociology of modern human communities. In this context,
Read moreLabour force and agricultural sector from the perspective of sustainable economic development
The aim of our study is to provide a comprehensive and objective analysis of the dynamics of labor, in general, and the employment of the population in the agricultural sector, in particular, by reference to the European Union member states. The problem becomes even more important in the context of the economic crisis’ effects and in relation to the Europe 2020 Strategy requirements. The article starts from an analysis of the figures recorded in
Read moreThe impact of the image of the organization in terms of the online communication paradigm
The impact of the image of the organization on the consumer of social media is growing strongly. Although, the release of a modern business pattern in the post-crisis economy leads to finding new interpretative ways of the relationship between the organization and the various categories of audience. The vision of building a successful organizational pattern, regardless of the domain of the organization revolves around the so-called "investments on
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