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Search Results: 1 - 10 of 446 matches for " Iuliana Stoica "
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Surface Properties and Compatibility with Blood of New Quaternized Polysulfones  [PDF]
Raluca Marinica Albu, Ecaterina Avram, Iuliana Stoica, Emil Ghiocel Ioanid, Dumitru Popovici, Silvia Ioan
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2011, DOI: 10.4236/jbnb.2011.22015
Abstract: The paper describes some properties of new quaternized polysulfones obtained by quaternization of chloromethylated polysulfone with different tertiary amines - N,N-dimethylethylamine and N,N-dimethyloctylamine. Hydrophilic/hydrophobic properties, morphological aspects and compatibility with red blood cells and platelets are affected by the alkyl radicals and by history of the formed films. The results obtained are useful in biomedical applications, including evaluation of bacterial adhesion to the surfaces, or utilization of modified polysulfones as semipermeable membranes.
Food Behavior Correlated with Lifestyle Pattern and Societal Influences in a Romanian Students Population. Part I: Eating General Habits  [PDF]
Iuliana Vintila
Food and Nutrition Sciences (FNS) , 2013, DOI: 10.4236/fns.2013.47091
Abstract: Input data from Students Food Behavior, Preference and Lifestyle Questionnaire conducted with 376 students from University “Dunarea de Jos” Galati (UDJG) were analyzed from socio-demographic criteria. The sample socio-demoraphic characteristics of the student population were investigated beside the general food & eating habits by gender. In the current study, most than three quart of students (76.06%) was of correct (normal) weight. Nearly 65.15% of the students reported having regular daily breakfast. The strongest correlation of having breakfast habit is show with the regular meal behaviour [r(3, 4) = 0.242] and regular meals were associated with reduced trends for BMI [r(4, 2) =-0.055].
General Markowitz Optimization Problems  [PDF]
George Stoica
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.312A281
Abstract:

We solve two Markowitz optimization problems for the one-step financial model with a finite number of assets. In our results, the classical (inefficient) constraints are replaced by coherent measures of risk that are continuous from below. The methodology of proof requires optimization techniques based on functional analysis methods. We solve explicitly both problems in the important case of Tail Value at Risk.

Neutrino Properties Probed by Lepton Number Violating Processes  [PDF]
Sabin Stoica
Open Journal of Microphysics (OJM) , 2013, DOI: 10.4236/ojm.2013.33B002
Abstract:

Study of neutrino properties is nowadays one of the most active domains of research in physics. On the one hand, fundamental properties of the neutrinos like their absolute mass, their character (are they Dirac or Majorana particles?) and the number of neutrino flavors, are still unknown. On the other hand, the knowledge of these properties are of great importance since the neutrinos are very abundant in nature and play a key role in nuclear and particle physics, astrophysics and cosmology. In addition, the results of the neutrino oscillation experiments have convincingly showed that neutrinos have mass and mix, in contradiction to the initial assumptions of the Standard Model. In this context there is an increased interest in the study of the Lepton Number Violating (LNV) processes, since they are capable to decide on the above mentioned neutrino properties. Since recently, the neutrinoless double beta (0nββ) decay was considered the only process able to distinguish between Dirac or Majorana neutrinos and to give a hint on the absolute mass of the electron neutrino. At present, the increased luminosity of the LHC experiments at CERN makes it feasable the search for LNV processes at LHC as well. Besides the neutrino character, these studies can also shed light on the existence of other types of neutrinos (the sterile neutrinos), than the three known ones. In this paper, I make a brief review on our present knowledge about the neutrino properties and on the way they can be probed by LNV processes at low- and high-energies. Particularly, I refer to the 0nββ decay process and to the first attempts of searching of LNV processes in hadron collider experiments, particularly in LHC experiments at CERN-Geneva.

Gnedenko-Raikov’s Theorem Fails for Exchangeable Sequences  [PDF]
George Stoica, Deli Li
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.312A277
Abstract:

We study the connection between the central limit theorem and law of large numbers for exchangeable sequences, and provide a counterexample to the Gnedenko-Raikov theorem for such sequences.

THE IMPACT OF WORLDWIDE CHANGES ON THE ROMANIAN CEREAL SECTOR
IULIANA IONEL
Lucr?ri ?tiin?ifice : Management Agricol , 2009,
Abstract: In the summer of the year 2007, the cereal prices worldwide were at the highest level, and the financial crisis determined their returning to normal parameters. In the present paper we wish to investigate the impact of the worldwide changes upon the European cereal sector and the Romanian cereal sector.
PRIMARY SCHOOL TEACHERS’ SELF-REGULATED LEARNING SKILLS
Iuliana Marchis
Acta Didactica Napocensia , 2011,
Abstract: Self-regulated learning (SRL) skills are very important in problem solving. It is important to strat to develop these skills from the first years of school. Thus, it is essential that primary school teachers master self-regulated learning skills and they know how to develop these skills in their pupils. In this article, we present the results of a research made among 31 primary school teachers regarding their self-regulated learning skills. The tool is a questionnaire developed specially for this purpose. This questionnaire has 19 questions, 16 items are related with the topic of the research and they are affirmations, which have to be evaluated by the respondents on a 5-point Likert scale: from 1- not at all typical for me to 5 – totally describes me. We have formulated the affirmations based on the theory of SRL. The results show that the respondents’ problem analyzing and help-seeking skills are low, but their self-monitoring skills are good. When analyzing the problem, only one third of the respondents rephrases the text of it and makes drawings for a deeper understanding. The respondents has good self-monitoring skills, almost two third of them check if the solution is correct and three quarters of the teachers check if they have used all the data of the problem. The respondents help-seeking abilities are low, only less then half of them are searching for similar worked examples and one third of them ask for the help of a colleague in case of an insuccesful problem solving. These results emphasize the necessity of developing primary school teachers’ problem solving and self-regulated learning skills.
HOW MATHEMATICS TEACHERS DEVELOP THEIR PUPILS’ SELF-REGULATED LEARNING SKILLS
Iuliana Marchis
Acta Didactica Napocensia , 2011,
Abstract: Self-regulated learning skills are important in mathematical problem solving. The aim of the paper is to present a research on how mathematics teachers guide their pupils’ mathematical problem-solving activities in order to increase self-regulation. 62 teachers have filled in a questionnaire developed for this research. The results are show that more than two third of the teachers promote the methods of understanding the problem; develop pupils’ self-efficacy and self-control. But only one third of the teachers ask pupils to use different strategies for solving a problem; ask students to explain the solution to their colleagues. In case of unsuccessful problem solving only one third of the respondents ask pupils to present previous knowledge about the problem or/and recall and try different methods.
The Impact of Food Behaviour, Lifestyle and Societal Influences in the Health & Emotional Status of a Romanian High School Population
Iuliana VINTILA
Revista de Cercetare ?i Interven?ie Social? , 2012,
Abstract: A complex social investigation of food behaviour, lifestyle and societal influences impact in the health & emotional status for a Romanian high school population of teenagers were conducted using input data from Food Behavior and Lifestyle Questionnaire (FBLQ). The impact of occidental model and media information were investigated against the traditional Romanian family model. The present study show that in condition of a good knowledge about healthy eating and no important restriction of healthy food accessibility the greatest influence in food choices, eating/lifestyle pattern were exercised by the parental family (63.3%), followed by media (29.4%) and friends (19.3%). The relevance of the traditional good family model of food choices is dominant but the eating habits (frequency of breakfast, regular meal) and lifestyle (sport, walking and smocking) are already “contaminated’ from media social models.
Key players and activities across the ERP life cycle: A temporal perspective
Iuliana SCORTA
Informatica Economica Journal , 2007,
Abstract: Enterprise Resource Planning (ERP) systems are enterprise wide systems that, because of their integration, automate all of a company's business processes. They have rapidly become the de facto industry standard for replacement of legacy systems. In this paper I analyze using an information theory approach the temporal aspects of key players and activities specific to Romanian SME's ERP implementations with focus on both generic and unique aspects
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