38 research outputs found
Planteamiento de una solución automatizada al proceso de manufactura de moldes y modelos para ASTEMODEL S.A.S.
En este artículo se presenta una técnica de digitalización 3D usada para la réplica de piezas de autopartes, tales como: Asientos, carteras para puertas, tableros millares, pisos falsos, techos, apoya cabezas, entre otros. Estas piezas son generalmente amorfas, por esta razón el levantamiento de un plano CAD, requiere de largos y complejos trabajos manuales con metodologías especializadas en el dibujo técnico. Es así como en este proyecto se estudian varias alternativas de digitalización mediante el uso de escáner 3D, mostrando las ventajas y desventajas que tiene cada tecnología según su principio físico de funcionamiento, el factor costo beneficio y la factibilidad para la aplicación. Posteriormente, se describe la forma de procesar los datos adquiridos, software usados, ventajas y desventajas de cada uno. Finalmente se muestra un balance de los beneficios que puede tener la implementación de este sistema frente al método tradicional de digitalización de piezas para la fabricación de moldes y modelos utilizada actualmente por la empresa ASTEMODEL S.A.Sthis article presents a 3D scanning technique used for the auto parts' replication such as: seats, doors' pockets, frontal panels, false floors, ceilings, head supports, among others. These pieces are generally amorphous, for this reason, the surveying of a CDA plane requires long and complex manual works with specialized methodologies in technical drawing. Thus, in this project several digitalization alternatives are studied by the use of a 3D scanner, showing the advantages and disadvantages of each technology, according to its physical operation principle, the cost-benefit factor and the application feasibility. Then, the gathered data analysis, software used and the advantages and disadvantages of each one are described. Finally, a balance is presented about the benefits that this implementation system can have compared to the traditional method of parts digitalization for the molds and models' manufacture, currently used by the company ASTEMODEL S.A.SN
Early Science with the Large Millimeter Telescope: an energy-driven wind revealed by massive molecular and fast X-ray outflows in the Seyfert Galaxy IRAS 17020+4544
We report on the coexistence of powerful gas outflows observed in millimeter
and X-ray data of the Radio-Loud Narrow Line Seyfert 1 Galaxy IRAS 17020+4544.
Thanks to the large collecting power of the Large Millimeter Telescope, a
prominent line arising from the 12CO(1-0) transition was revealed in recent
observations of this source. The complex profile is composed by a narrow
double-peak line and a broad wing. While the double-peak structure may be
arising in a disk of molecular material, the broad wing is interpreted as the
signature of a massive outflow of molecular gas with an approximate bulk
velocity of -660 km/s. This molecular wind is likely associated to a
multi-component X-ray Ultra-Fast Outflow with velocities reaching up to ~0.1c
and column densities in the range 10^{21-23.9} cm^-2 that was reported in the
source prior to the LMT observations. The momentum load estimated in the two
gas phases indicates that within the observational uncertainties the outflow is
consistent with being propagating through the galaxy and sweeping up the gas
while conserving its energy. This scenario, which has been often postulated as
a viable mechanism of how AGN feedback takes place, has so far been observed
only in ULIRGs sources. IRAS 17020+4544 with bolometric and infrared luminosity
respectively of 5X10^{44} erg/s and 1.05X10^{11} L_sun appears to be an example
of AGN feedback in a NLSy1 Galaxy (a low power AGN). New proprietary
multi-wavelength data recently obtained on this source will allow us to
corroborate the proposed hypothesis.Comment: Accepted for publication on ApJ Letters, 9 pages, 4 figure
Social representation of family support for diabetic patients in users of a family medicine unit in Chalco, State of Mexico
Con el objetivo de interpretar y comparar el significado del apoyo familiar desde la perspectiva de la familia y del diabético, sobre la base de la teoría de las representaciones sociales desde el enfoque estructural de la teoría de Abric. El estudio se realizó en población de una unidad de medicina familiar del municipio de Chalco, Estado de México. La población estudiada consistió en diez binomios de tipo familiar-diabético. Se realizó la asociación libre de palabras con la finalidad de encontrar los términos o frases relacionadas con “apoyo familiar”, así como su frecuencia de ítem y rango de asociación. Una vez obtenidos los términos o frases se categorizaron de acuerdo a las funciones de “apoyo”, se efectuó una entrevista semiestructurada para cada categoría y se realizó un análisis gráfico de los significados de Friedman. En los resultados se logra percibir diferencias en la centralidad de los términos y frases. Por parte de la familia se presenta más cargada hacia la esfera de actividad y por parte del paciente hacia la esfera afectiva. El trabajo evidencia la necesidad afectiva por parte del enfermo como punto esencial de apoyo. Algo que nos remite a reflexionar sobre modificar las estrategias, en el momento de proponer programas en salud pública, de modo que contemplen el apoyo familiar desde una mirada de la otredad
Effect of electroless coating parameters and ceramic particle size on fabrication of a uniform Ni–P coating on SiC particles
Static charged perfect fluid spheres in general relativity
Interior perfect fluid solutions for the Reissner-Nordstrom metric are
studied on the basis of a new classification scheme. General formulas are found
in many cases. Explicit new global solutions are given as illustrations. Known
solutions are briefly reviewed.Comment: 23 pages, Revtex (galley), journal version, to appear in Phys.Rev.
Evaluación de TuFormulas. Diseño y aplicación de indicadores para medir el impacto y la sostenibilidad de este recurso educativo como herramienta de enseñanza y aprendizaje
Depto. de Química en Ciencias FarmacéuticasFac. de FarmaciaFALSEsubmitte
Improved functionalization of oleic acid-coated iron oxide nanoparticles for biomedical applications
Superparamagnetic iron oxide nanoparticles
can providemultiple benefits for biomedical applications
in aqueous environments such asmagnetic separation or
magnetic resonance imaging. To increase the colloidal
stability and allow subsequent reactions, the introduction
of hydrophilic functional groups onto the particles’
surface is essential. During this process, the original
coating is exchanged by preferably covalently bonded
ligands such as trialkoxysilanes. The duration of the
silane exchange reaction, which commonly takes more
than 24 h, is an important drawback for this approach. In
this paper, we present a novel method, which introduces
ultrasonication as an energy source to dramatically
accelerate this process, resulting in high-quality waterdispersible nanoparticles around 10 nmin size. To prove
the generic character, different functional groups were
introduced on the surface including polyethylene glycol
chains, carboxylic acid, amine, and thiol groups. Their
colloidal stability in various aqueous buffer solutions as
well as human plasma and serum was investigated to
allow implementation in biomedical and sensing
applications.status: publishe
Mortality from gastrointestinal congenital anomalies at 264 hospitals in 74 low-income, middle-income, and high-income countries: a multicentre, international, prospective cohort study
Summary
Background Congenital anomalies are the fifth leading cause of mortality in children younger than 5 years globally.
Many gastrointestinal congenital anomalies are fatal without timely access to neonatal surgical care, but few studies
have been done on these conditions in low-income and middle-income countries (LMICs). We compared outcomes of
the seven most common gastrointestinal congenital anomalies in low-income, middle-income, and high-income
countries globally, and identified factors associated with mortality.
Methods We did a multicentre, international prospective cohort study of patients younger than 16 years, presenting to
hospital for the first time with oesophageal atresia, congenital diaphragmatic hernia, intestinal atresia, gastroschisis,
exomphalos, anorectal malformation, and Hirschsprung’s disease. Recruitment was of consecutive patients for a
minimum of 1 month between October, 2018, and April, 2019. We collected data on patient demographics, clinical
status, interventions, and outcomes using the REDCap platform. Patients were followed up for 30 days after primary
intervention, or 30 days after admission if they did not receive an intervention. The primary outcome was all-cause,
in-hospital mortality for all conditions combined and each condition individually, stratified by country income status.
We did a complete case analysis.
Findings We included 3849 patients with 3975 study conditions (560 with oesophageal atresia, 448 with congenital
diaphragmatic hernia, 681 with intestinal atresia, 453 with gastroschisis, 325 with exomphalos, 991 with anorectal
malformation, and 517 with Hirschsprung’s disease) from 264 hospitals (89 in high-income countries, 166 in middleincome
countries, and nine in low-income countries) in 74 countries. Of the 3849 patients, 2231 (58·0%) were male.
Median gestational age at birth was 38 weeks (IQR 36–39) and median bodyweight at presentation was 2·8 kg (2·3–3·3).
Mortality among all patients was 37 (39·8%) of 93 in low-income countries, 583 (20·4%) of 2860 in middle-income
countries, and 50 (5·6%) of 896 in high-income countries (p<0·0001 between all country income groups).
Gastroschisis had the greatest difference in mortality between country income strata (nine [90·0%] of ten in lowincome
countries, 97 [31·9%] of 304 in middle-income countries, and two [1·4%] of 139 in high-income countries;
p≤0·0001 between all country income groups). Factors significantly associated with higher mortality for all patients
combined included country income status (low-income vs high-income countries, risk ratio 2·78 [95% CI 1·88–4·11],
p<0·0001; middle-income vs high-income countries, 2·11 [1·59–2·79], p<0·0001), sepsis at presentation (1·20
[1·04–1·40], p=0·016), higher American Society of Anesthesiologists (ASA) score at primary intervention
(ASA 4–5 vs ASA 1–2, 1·82 [1·40–2·35], p<0·0001; ASA 3 vs ASA 1–2, 1·58, [1·30–1·92], p<0·0001]), surgical safety
checklist not used (1·39 [1·02–1·90], p=0·035), and ventilation or parenteral nutrition unavailable when needed
(ventilation 1·96, [1·41–2·71], p=0·0001; parenteral nutrition 1·35, [1·05–1·74], p=0·018). Administration of
parenteral nutrition (0·61, [0·47–0·79], p=0·0002) and use of a peripherally inserted central catheter (0·65
[0·50–0·86], p=0·0024) or percutaneous central line (0·69 [0·48–1·00], p=0·049) were associated with lower mortality.
Interpretation Unacceptable differences in mortality exist for gastrointestinal congenital anomalies between lowincome,
middle-income, and high-income countries. Improving access to quality neonatal surgical care in LMICs will
be vital to achieve Sustainable Development Goal 3.2 of ending preventable deaths in neonates and children younger
than 5 years by 2030