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Wyszukujesz frazę "Flores, J.S." wg kryterium: Autor

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Numerical and Experimental Analysis for Shape Improvement of a Cruciform Composite Laminates Specimen
    Numeryczna i eksperymentalna analiza poprawy kształtu próbek o kształcie krzyżowym wykonanych z laminatu
    Autorzy:
    Gutiérrez, J. C.
    Lozano, A.
    Manzano, A.
    Flores, M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/234347.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    polymer-matrix composites
    PMC
    mechanical properties
    finite element analysis
    FEA
    non-destructive testing
    Biaxial testing
    cruciform specimen
    kompozyty z matrycą polimerową
    właściwości mechaniczne
    analiza metodą elementów skończonych
    badania nieniszczące
    testowanie dwuosiowe
    Opis:
    The use of composite materials has spread to different applications among which, those using thin sheet plates subjected to biaxial loads are commonly used in the car and aerospace industries. Hence, there is need of a reliable specimen to test these materials under biaxial loads. This reliability depends on measurements that are accurate and repeatable. Thus these measurements depend on the proper design of specimens. This paper reviews the development of cruciform specimens of carbon fibre composite materials and how the geometric shape has evolved. Based on this review, a new geometric shape is proposed. This improvement is based on numerical analysis of the specimen and tests results of experimental measurements carried out using a four piston rig in an orthogonal arrangement. Deformation is measured in the centre of the specimen using strain gauges. By obtaining the principal stresses, it was found that maximum stresses occur in the centre of the specimen.
    Powszechnie stosowane są kompozyty poddawane testom dwuosiowym. Prawidłowe przeprowadzenie tego rodzaju testów jest trudne biorąc pod uwagę rozkład naprężeń badanych w próbce. Omówiono szereg struktur stosowanych dla uzyskania wyników dokładnych i powtarzalnych. Przeprowadzono analizę poprawy kształtu próbki rozpatrując laminat z udziałem włókien węglowych i żywicy epoksydowej. Przeprowadzono testy rozciągania dwuosiowego. Odkształcenia mierzono w centralnej części próbki stosując specjalne czujniki przesunięcia. Stwierdzono, że maksymalne naprężenia występują w środku próbki.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2016, 2 (116); 89-94
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Size optimization of rectangular cross-section members subject to fatigue constraints
    Autorzy:
    González Mendoza, J. M.
    Alcántara Montes, S.
    Silva Lomelí, J. J.
    Flores Campos, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/949129.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    size optimization
    multiaxial fatigue
    non-proportional
    Opis:
    Although in the scientific literature there are studies regarding optimization of structural members subject to static loads or even cyclic in-phase loads, the optimization of structures subject to cyclic, out-of-phase multiaxial loads is still an unexplored issue. In this paper, we present an approach to the problem of size optimization of rectangular cross-section members subject to multiaxial in-phase and out-of-phase cyclic loads. The objective of the optimization is to minimize the cross sectional area of such elements while retaining their fatigue endurance. Under the proposed methodology, optimum values of the area are achieved for six loading cases and for three values of the height to width ratio of the cross section, and these values are reported. The novelty of the approach lies in the inclusion of two multiaxial high cycle fatigue criteria, i.e., Dang Van and Vu-Halm-Nadot ones, as constraints for size optimization problems, fully integrated within an in-house developed tool, capable of handling non-proportional stresses. A plot of the feasible solution space for this optimization problem is also obtained.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2017, 55, 2; 547-557
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Genetic profile for the detection of susceptibility to poisoning by exposure to pesticides
    Autorzy:
    Galvez, H.R.C.
    Flores, J.S.
    Sanchez, E.D.T.
    Bravo, D.R.
    Villela, M.Z.R.
    Uribe, E.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/28762819.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2021, 28, 2; 208-213
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of instructional materials in physical education to enhance the students’ knowledge and skills in swimming and life-saving techniques
    Autorzy:
    Germo, R. R.
    Sarinas, B. G. S.
    Coo, E. C.
    Teruñez, M. R.
    Gavadan, B. E.
    Jardenil, C. Y.
    Flores, J.R.P.V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2172495.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    maritime education and training
    physical education
    instructional materials
    swimming techniques
    life saving techniques
    bachelor of Science in marine transportation
    life saving appliances
    Opis:
    John B. Lacson Foundation Maritime University (Arevalo), Inc. is mandated to offer aquatic-sports courses such as paddling, rowing, sailing, and swimming to equip students with needed skills essential for survival in case of emergencies. Since, there is a dearth of instructional materials in Physical Education 2 (Advanced Swimming and Life-saving Techniques), the JBLFMU-Arevalo was given a research grant by the CHED (Commission on Higher Education) known as DARE TO (Discovery Applied Research and Extension Trans/Inter-Disciplinary Opportunities) to address the problem. This DARE TO grant aimed to develop instructional materials in PE 2 that will enhance the swimming performance and life-saving techniques of students. That is why the researchers would like to test for the effectiveness of this instructional material in the form of modules over the traditional approach which is lecture in improving the students’ swimming performance and life-saving techniques in terms of their knowledge and skills. This non-equivalent control group under quasi-experimental study was utilized among the BSMT (Bachelor of Science in Marine Transportation) students. A pretest was used to determine swimming performance of the experimental and control groups. An intervention through the use of instructional materials was employed in the experimental group for the whole semester (five months) while the control group was exposed to lecture as a traditional method of instruction. After a semester, the posttest was administered. The statistical tools used were mean, standard deviation, Mann-Whitney test, and Wilcoxon-signed ranks test. The findings of the study revealed that the instructional material is effective in enhancing the swimming performance and life-saving techniques of students both in the aspects of knowledge and skills. Both the experimental and control groups were “Fair” in their knowledge pretest scores but during the posttest, the experimental group was “Good” and the control group was “Fair”. On the other hand, both the experimental and control groups were “Fair” in their skills’ pretest scores but during their posttest, the control group was “Good” while the experimental group was “Excellent”. The experimental group who used the module showed significantly better performance during the posttest both for knowledge and skills compared to the control group who did not use the module (lecture only). The study further showed significant differences in the mean gains between the experimental and control groups after the conduct of pretest and posttest in favor of the experimental group. It can be gleaned from the results that the module can enhance the knowledge and skills in swimming performance and life-saving techniques of the experimental group. It is highly recommended that this module be utilized among maritime schools offering swimming and life-saving courses.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 2; 233--240
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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