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Search Results: 1 - 10 of 221057 matches for " Danilo C. Basista "
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Difficulties in College Algebra of Freshmen Students at the University of Eastern Philippines: Basis for Modular Construction  [PDF]
Olga D. G. Unay, Ida E. Esquierdo, May Jane B. Calpa, Danilo C. Basista, Emilia Vanessa Selena B. Pinca, Fel B. Muncada Jr.
Open Access Library Journal (OALib Journal) , 2016, DOI: 10.4236/oalib.1102597
Abstract: A strong grasp in mathematics is a key factor in ensuring success in mathematics education. This study tried to identify the difficulties in College Algebra of freshmen students in the University of Eastern Philippines during the school year 2013-2014 as basis for modular construction. The performance level was determined by giving a teacher made test to find out the skill areas students were deficient. The causes of their deficiencies were traced as basis for constructing modules. In this study, the descriptive normative method of research was used where the College of Science freshmen students were the respondents. The performance level of the students in College Algebra based on teacher made test given by the researchers was very low, the overall total score of total score of the given items answered correctly by the students was 324, the average was 77.16 and the mean performance was 26.34. The result showed that the mean performance was 26.34. The result showed that the mean performance was very low without mastery. The students had almost no background on the seven areas which resulted to their very low performance. They lacked knowledge, competency and skills in answering questions especially in solving the application of word problems which obtained a mean score of 2.99, followed by special product and factoring, equations and radicals. The result of the study showed that the students were deficient in the application of word problems, special product and factoring, equations and radicals.
Micromechanical modeling of sulphate corrosion in concrete: Influence of ettringite forming reaction
Basista M.,Weglewski W.
Theoretical and Applied Mechanics , 2008, DOI: 10.2298/tam0803029b
Abstract: Two micromechanical models are developed to simulate the expansion of cementitious composites exposed to external sulphate attack. The difference between the two models lies in the form of chemical reaction of the ettringite formation (through-solution vs. topochemical). In both models the Fick's second law with reaction term is assumed to govern the transport of the sulphate ions. The Eshelby solution and the equivalent inclusion method are used to determine the eigenstrain of the expanding ettringite crystals in microcracked hardened cement paste. The degradation of transport properties is studied in the effective medium and the percolation regime. An initial-boundary value problem (2D) of expansion of a mortar specimen immersed in a sodium sulphate solution is solved and compared with available test data. The obtained results indicate that the topochemical mechanism is the one capable of producing the experimentally observed amount of expansion.
Hamiltonian Effective Potential
Beth Basista,Peter Suranyi
Physics , 1992, DOI: 10.1103/PhysRevD.48.3826
Abstract: A Hamiltonian effective potential (the logarithm of the square of the wave functional) is defined and calculated at the tree and one loop levels in a $\phi^4$ scalar field theory. The loop expansion for eigenfunctionals is equivalent to the combination of WKB expansion and an expansion around constant field configurations. The results are compared with those obtained from the Lagrangian effective potential. While at tree level the results from the two methods coincide, at one loop level they differ. Our result at one loop level is that the reflection symmetry is not broken at $m^2\geq0$.
High Purity Germanium, a Review on Principle Theories and Technical Production Methodologies  [PDF]
Danilo C. Curtolo, Semiramis Friedrich, Bernd Friedrich
Journal of Crystallization Process and Technology (JCPT) , 2017, DOI: 10.4236/jcpt.2017.74005
Abstract: Since the early 1950’s the use of Germanium has been continuously growing as new applications are being developed. Its first commercial usage as the main material, from which the semiconductors were made, was later replaced by Silicon. The applications were then shifted to a key component in fiber optics, infrared night vision devices and space solar cells, as well as a polymerization catalyst for polyethylene terephthalate (PET). With the advance development in new technologies, the attentions have been brought back to Germanium due to its excellent semiconductor properties. New applications on the field of high efficiency solar cells, SiGe based chips, LED technologies, etc., are being developed and show a great potential. According to DERA (Deutsche Rohstoffagentur/German Mineral Resources Agency), the demand for Ge will grow considerably by 2030, pushed mostly by the increase in the fiber optics market and advanced materials sector [1]. Therefore, this paper focuses on an overview of the production chain of Germanium, especially from its concentrate up to the single crystal growth of its valuable ultra-pure metallic form to be used in high technological applications.
Sensitization Properties of Propolis and Balsam of Peru in Guinea Pig Maximization Test (GPMT)  [PDF]
Katarzyna Basista-So?tys, Barbara Filipek, Monika Zadro?na, Barbara Nowak, Agata Pietrzycka, Grzegorz Kazek
Food and Nutrition Sciences (FNS) , 2017, DOI: 10.4236/fns.2017.87050
Abstract: Introduction: Propolis is used in Poland as an active ingredient of some drugs administered externally, dietary supplements and cosmetics. According to the literature, propolis is a non-toxic and safe substance, although it may cause allergic contact dermatitis. Aim: The aim of this study was to assess the allergenic properties of propolis and Balsam of Peru. Material and methods: The study was conducted according to the OECD Guideline for testing of chemicals-Skin sensitization with use of Guinea pig maximization test (GPMT). Guinea pigs have similar sensitivity to allergens as human body. Sensitization properties of propolis were tested in comparison with sensitization properties of Balsam of Peru because of the possibility of cross-reaction between those two substances. Results: The skin of guinea pigs in the propolis group showed no visible change compared to the control group during the first (48 h) and second observation (72 h). The skin of guinea pigs from Balsam of Peru group showed discrete erythema in only one case at the first observation (8.33% of the animals). During the second observation, no visible changes were observed compared to the control group. Conclusions: Guinea pig maximization test showed no sensitizing properties of propolis and weak sensitizing properties of Balsam of Peru in concentration of 5%.
Simulation and Control of Turbulence at Tokamaks with Artificial Intelligence Methods  [PDF]
Danilo Rastovic
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.312234
Abstract: The control of turbulence at tokamaks is very complex problem.The idea is to apply the fuzzy Markovian processes and fuzzy Brownian motions as good approximation of general robust drift kinetic equation. It is obtained by using the artificial neural networks for solving of appropriate advanced control problem. The proof of the appropriate theorem is shown.
Over and Undershot Waterwheels in the 18th Century. Science-Technology Controversy  [PDF]
Danilo Capecchi
Advances in Historical Studies (AHS) , 2013, DOI: 10.4236/ahs.2013.23017
Abstract: The present paper concerns the development of theory and experiments on water wheels in the 18th cen- tury. At that time, as a result of a growing demand for energy, a better understanding of the functioning of watermills, even at the theoretical level, was required in order to improve their efficiency. A hint about the evolution of the theory of wheels in the 19th century is reported also. We have tried to clarify the role played by some protagonists as Antoine Parent, Jean-Charles de Borda and John Smeaton. Their role has not been fully recognised even in contemporary studies. Then some considerations are developed on the relationships between science and technology on this particular subject, concluding that it was a happy and well-balanced marriage.
Epistemology of Greek Harmonics  [PDF]
Danilo Capecchi
Advances in Historical Studies (AHS) , 2015, DOI: 10.4236/ahs.2015.43014
Abstract: Greek harmonics is the theory of the organization of notes with respect to the highness or lowness of their pitches. This was a mathematical science, a thorough knowledge of which was not necessary for the professional musician and was thus cultivated essentially by mathematicians and philosophers. For them, harmonics was mixed mathematics, the mix being between experimental assertions derived from hearing and propositions derived from reason, that was, mathematics. This classification was maintained through the Middle Ages and the Renaissance. Despite the important role played by harmonics in ancient science, little consideration has been given by historians of science. This study shows that harmonics merits a careful study and that its methods are the same as other sciences. Particular attention was devoted to Ptolemy who applied the same approach to harmonics as he did to astronomy, astrology and geography.
Experiments, Mathematics and Principles of Natural Philosophy in the Epistemology of Giovanni Battista Baliani  [PDF]
Danilo Capecchi
Advances in Historical Studies (AHS) , 2017, DOI: 10.4236/ahs.2017.62006
Abstract: The epistemology of Giovanni Battista Baliani, a leading 17th century Italian scientist, is the focus of this article. In his treatise on motion, De motu naturali gravium solidorum (1638), Baliani’s epistemology was grounded on empirical principlesthe law of the pendulum essentiallyin the footsteps of the old mixed mathematics. In a new edition, De motu naturali gravium solidorum et liquidorum (1646), Baliani changed his approach and grounded his epistemology on principles of natural philosophy with a metaphysical and not empirical evidence. An analysis of Baliani’s writings reveals a tension between his empiricist philosophy, which he maintained throughout his life, and his mathematical approach, which was still based on experience; but on an experience derived from measurements and intrinsically affected by errors, it was hence uncertain. A comparison with Galileo’s epistemology is also made to better understand trends in mathematical physics at the end of the 1600’s.
Perspectivas y experiencias creativas para estudiantes universitarios
Donolo,Danilo; Rinaudo,María C.;
Cuadernos de la Facultad de Humanidades y Ciencias Sociales. Universidad Nacional de Jujuy , 2008,
Abstract: the proposal collects five prospects on creativity in higher education environments in the context of a research project in the past three years. a first aspect relates to the construction of knowledge and creativity, the second presents the claim of creative leadership. then advances in neuropsychology us a few paragraphs on neural networks in favor of creativity. close the presentation two inputs, a more academic presence and absence of creativity, and another that displays the configuration settings that invite creative action of people like to be creative.
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