Browsing Investigación by Title
Now showing items 15739-15758 of 19075
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QA Programme of the TLD laboratory of the University of Costa Rica: IEC 61066 testing
(2008)The Thermoluminescence Personal Dosimetry Laboratory of the University of Costa Rica provides dose measurements for around 90% of occupational radiation workers in the country. The assessment of doses to workers routinely ... -
Qbo Robot as an Educational Assistant - Participants Feedback on the Engagement Level Achieved with a Robot in the Classroom
(2019)A non-humanoid robot is used to assist in an educational workshop of Quality Assurance and DevOps. The goal of this research was to determine the level of engagement shown by students of computer science in a presentation ... -
Quadratic Hamiltonians in phase-space quantum mechanics
(1989-07)The dynamical evolution is described within the phase-space formalism by means of the Moyal propagator, which is the symbol of the evolution operator. Quadratic Hamiltonians on the phase space are distinguished in that ... -
Quadratic variation for cylindrical martingale-valued measures
(2023)This article focuses in the definition of a quadratic variation for cylindrical orthogonal martingale-valued measures defined on Banach spaces. Sufficient and necessary conditions for the existence of such a quadratic ... -
Quality assessment in the extemporaneous pediatric preparation of powder papers containing crushed tablets of spironolactone or amiodarone
(2017-08)To elaborate the pediatric medicines the specifics of this population must be considered. Powder papers as extemporaneous formulations may be an option to provide dosing flexibility. The main objective of this research ... -
Quality control performed on liposomal formulations based on guarana extract, vitamins a, c, e, b1, b2, b5, b6, b12, biotin and folic acid, used as nutritional products
(2017)The study of has increased in the last decades. One of the mechanisms that has acquired great relevance is to formulate using liposomal vesicles. Liposomes are structures that enh and transport of active compounds, which ... -
Quality of Science Reports:Analysis of Sports Nutrition 2013 ACSM Annual Meeting Abstracts
(2014-05)The objective of the ACSM Annual Meeting is the exchange of scientific information. Authors of free communications must submi t abstracts by a specific deadline for evaluation. As the written record of those presentations, ... -
Quality verification of six medicines in wholes and halves tablets, re-packaged in individual plastic compartments during sixty days
(2017)Plastic boxes with individual compartments are often used to improve medication compliance and only a few studies have been done on the stability of the tablet halves after placing them on these devices. In this investigation, ... -
Quantification of snake venom proteomes by mass spectrometry-considerations and perspectives.
(2023-05-08)The advent of soft ionization mass spectrometry-based proteomics in the 1990s led to the development of a new dimension in biology that conceptually allows for the integral analysis of whole proteomes. This transition from ... -
Quantifying the benefits of a solar home system-based DC microgrid for rural electrification
(2019)Off-grid solar home systems (SHSs) currently constitute a major source of providing basic electricity needs in un(der)-electrified regions of the world, with around 73 million households having benefited from off-grid solar ... -
Quantitation by enzyme-immunoassay of antibodies against Bothrops myotoxins in four commercially-available antivenoms
(1991)An enzyme-immunoassay (EIA) for the quantitation of antibodies against myotoxins present in the venoms of Bothrops asper (Costa Rica), B. atrox (Colombia) and B. moojeni (Brazil), was developed. This EIA was utilized for ... -
Quantitation of myonecrosis induced by myotoxin a from prairie rattlesnake (Crotalus viridis viridis) venom
(1982)Using a pure myotoxin (myotoxin a) isolated from prairie rattlesnake Crotalus viridis viridis) venom, a comparison between two methods for quantitating myonecrosis in mice was made. Measurement of creatine kinase (CK) ... -
Quantitative genetic analysis of anxiety trait in bipolar disorder
(2017)Background:Bipolar disorder type I (BPI) affects approximately 1% of the world population. Although geneticinfluences on bipolar disorder are well established, identification of genes that predispose to the illness has ... -
Quantitative Physiology Approaches to Understand and Optimize Reducing Power Availability in Environmental Bacteria
(2015-06-04)The understanding of how carbon fluxes are distributed through a metabolic network offers an overview of the pathways that a given microorganism uses to produce energy, reducing power, and biomass. These invaluable data ... -
Quantum electrodynamics in external fields from the spin representation
(1994-07)Systematic use of the infinite-dimensional spin representation simplifies and rigorizes several questions in quantum field theory. This representation permutes "Gaussian" elements in the fermion Fock space, and is necessarily ... -
Quantum ferroelectric instabilities in superconducting SrTiO3
(2018)We examine the effects of strain and cation substitution on the superconducting phase of polar semiconductors near a ferroelectric quantum phase transition with a model that combines a strong coupling theory of ... -
Quantum gauge models without classical Higgs mechanism
(2010-09-15)We examine the status of massive gauge theories, such as those usually obtained by spontaneous symmetry breakdown, from the viewpoint of causal (Epstein-Glaser) renormalization. The BRST formulation of gauge invariance in ... -
Quantum symmetry groups of noncommutative spheres
(2001-08)We show that the noncommutative spheres of Connes and Landi are quantum homogeneous spaces for certain compact quantum groups. We give a general construction of homogeneous spaces which support noncommutative spin geometries. -
Quantum Theory of Triboelectricity
(2020-10-30)We propose a microphysical theory of the triboelectric effect by which mechanical rubbing separates charges across the interface between two materials. Surface electrons are treated as an open system coupled to two baths, ... -
Lo que depara la pandemia al nuevo presidente
(2022-04-05)El 9 de mayo la flamante administración encontrará el país navegando sobre una nueva ola pandémica. Hacia el 8 de junio los nuevos diagnósticos de Covid-19 podrían ser 3.000 diarios.