Ingeniería Industrial
https://hdl.handle.net/20.500.12724/8984
2024-03-29T15:35:26ZFinite Element Model for End-Plate Beam-to-Column Connections Under Bending and Axial Forces
https://hdl.handle.net/20.500.12724/18906
Finite Element Model for End-Plate Beam-to-Column Connections Under Bending and Axial Forces
Diaz Velazco, Israel Alan Leon Aurelio; Del Savio, Alexandre Almeida
The assessment of steel beam-to-column connections is a fundamental piece in the design process of steel structures according to the guidelines established by standards such as Eurocode 3—Part 1.8 and ANSI/AISC 358-16. In addition, the finite element analysis is an alternative path to determine the behavior of steel beam-to-column connections in contrast to the analytical methods. Furthermore, the axial force in a semi-rigid steel structure connection is usually negligible compared to a bending force. However, there are some scenarios where the influence of axial forces cannot be ignored due to their elevated value. Therefore, a finite element model for end-plate beam-to-column connections is proposed considering the actions of bending and axial forces. The numerical simulation results were validated with experimental data, and an approximate representation of the physical phenomena was obtained.
2023-01-01T00:00:00ZFractionation of Seeds or Grains
https://hdl.handle.net/20.500.12724/18897
Fractionation of Seeds or Grains
Capitani, Marianela; Scilingo, Adriana; Calandri, Edgardo; Giménez, María Alejandra; Martínez, Marcela Lilian; Ixtaína, Vanesa; Chasquibol Silva, Nancy Ascención; Pérez Camino, M. Carmen; Bassett, Natalia; Delgado-Soriano, Víctor; Repo-Carrasco-Valencia, Ritva Ann-Mari; Haros, Claudia M.; Tomás, Mabel
In the last few years, the Latin-American seeds have gained increased importance (also due to the increased demand for gluten-free foods). Worldwide demand for Latin-American seeds and grains has risen in a high proportion. In parallel, seeds and grains´ research from this region in all relevant fields has been intensified. Latin-American Seeds: Agronomic, Processing and Health Aspects summarizes the recent research on Latin-American crops regarding agronomic and botanical characteristics, composition, structure, use, production, technology, and impact on human health.
2023-01-01T00:00:00ZNuclear Magnetic Resonance Spectroscopy in Analyses of Biological Samples
https://hdl.handle.net/20.500.12724/18322
Nuclear Magnetic Resonance Spectroscopy in Analyses of Biological Samples
Stanisic, Danijela; Gelain Martins, Lucas; Tasic, Ljubica
Nuclear magnetic resonance (NMR) spectroscopy can be used for the analysis of almost all biological samples regardless of their complexity and physical state, sometimes requiring minimal sample preparation and handling prior analysis. The variety of molecules for NMR analyses is great from those with very small molecular masses, like metabolites, up to ones with great molecular masses such as proteins and nucleic acids. Nevertheless, for structural analysis of proteins, DNA and RNA or even low molecular mass molecules, there are special requirements for sample preparation with isotope enrichment-common for protein-NMR, samples' purity and many multidimensional experiments. Far more interesting from the bioanalytical applications point of view are NMR applications for complex mixtures studies such as extracts, cells or cell cultures, tissues, and bio-fluids, which require minimal preparations of a sample, dilution, or concentration. Among the most used techniques for lipidomics and metabolomics analyses, we can cite some semisolid and liquid-state NMR mainly based on 1H NMR but also on other spin-active nuclei present in biomolecules, such as 31P, 15N, 13C. This chapter brings some key steps that must be followed when targeting analyses of complex samples by NMR such as sample pretreatment and preparation, correct choice and execution of the most appropriate NMR experiments, then, data and spectral processing, statistical analysis, and identification of key molecules and fingerprints of analyzed samples.
2021-01-01T00:00:00ZCharacterization and Preservation of the Bioactive Compounds of Sacha Inchi (Plukenetia volubilis and P. huayllabambana) Oils
https://hdl.handle.net/20.500.12724/17642
Characterization and Preservation of the Bioactive Compounds of Sacha Inchi (Plukenetia volubilis and P. huayllabambana) Oils
Chasquibol Silva, Nancy Ascención; Alarcón Rivera, Rafael; Gómez Coca, Wenceslao Moreda; Pérez-Camino, M. Carmen
This chapter focuses on the functional properties of sacha inchi (Plukenetia volubilis and P. huayllabambana) oils and reveals the potential of these two widespread taxa. Their balanced composition in ¿-3 and ¿-6 fatty acids and unique taste make them highly valued. Their healthy properties are summarized in the literature, along with the characterization of the oil in terms of fatty acids, triacylglycerol molecular species, sterols, tocopherols, aliphatic hydrocarbons, and alcohol compositions. The data presented correspond to well-controlled genuine oils and commercial samples from the market. The studies on the composition of the commercialized sacha inchi oils reveal that many are not genuine. Their high percentage of polyunsaturated fatty acids, Ln+L (>75%) makes sacha inchi oils especially susceptible to oxidation and the development of rancid odors in a relatively short period of time. The oxidative alteration of these oils endangers the quality and nutritional content of the foods which contain them. Techniques such as seed roasting or oil microencapsulation have emerged as natural alternatives to protect and increase the stability of these special oils. Therefore, it is now possible to safely use them in food preparations, maintaining their bioactive components, thus making them an important ingredient in the development of new functional foods and healthy designer dishes.
Indexado en Scopus
2022-01-01T00:00:00Z