599,220 research outputs found
Política Institucional de Innovación
No full textEsstablece los lineamientos y el marco normativo para promover, gestionar y consolidar una cultura de innovación dentro de la institución, articulada a sus funciones sustantivas de formación, investigación y responsabilidad social. La política reconoce la importancia del cambio, la creatividad, la colaboración y la apertura a nuevas ideas como pilares para la transformación institucional, buscando generar impacto en la calidad de vida de la comunidad universitaria y contribuir al desarrollo social y humano, tanto a nivel local como nacional. Además, el documento describe la estructura organizacional responsable, los principios, criterios de gestión y los mecanismos de evaluación que garantizan la implementación y mejora continua de las acciones innovadoras, en coherencia con el Proyecto Educativo Institucional y el Plan de Desarrollo Institucional
Betaine as an alternative feed additive to choline and its effect on performance, blood parameters, and egg quality in laying hens rations
No full textABSTRACT: This research aimed to evaluate how using betaine levels as a choline substitute affects productive performance, egg quality parameters, fatty acids profile, and antioxidant status in laying hens. One hundred and forty brown chickens, 45 wk old, were divided into 4 groups, each group of 7 replicates with 5 chickens per replicate. The first group of diets with choline has control (A) 100% choline, the second group (B) 75% choline + 25% betaine, the third group (C) 50% choline + 50% betaine, and the fourth group (D) received 100% betaine. No significant effects were observed in final body weight (BW), body weight gain (BWG), egg production (EW), and feed intake (FI) for laying hens. In the diet in which betaine was replaced choline, egg mass (EM) and egg weight (EW) increased compared to the control group (P < 0.05). Also, after 12 wk of feeding, the egg quality parameters were not influenced; however, yolk color was increased significantly compared with the control group. Serum total cholesterol, LDL-lipoprotein, HDL-lipoprotein, triglyceride, glucose, aspartate transaminase (AST), and alanine transaminase (ALT) were not affected by replacing choline with betaine. Furthermore, liver malondialdehyde (MDA) content, yolk vitamin E, and fatty acid levels were not significantly affected by replacing choline with betaine. Moreover, hens fed betaine displayed an increased antibody titer of the Newcastle disease (ND) virus. EW and EM were increased by 3.50% and 5.43% in 100% betaine group (D) when compared to the control group. Isthmus weight was decreased by 48.28 % in 50% choline + 50% betaine group (C) when compared to the control group. ND was increased by 26.24% in 100% betaine group when compared to the control group. In conclusion, betaine supplementation positively affected productive performance, egg quality measurements, and immunity response in Bovans brown laying hens
STATE INTERVENTIONISM IN THE LATE CLASSIC MAYA PALENQUE POLITY: HOUSEHOLD AND COMMUNITY ARCHAEOLOGY AT EL LACANDON
No full textArchaeological materials from seven excavated households (three commoner, three elite and a super-elite) from El Lacandón, a rural settlement of the Ancient Maya Palenque polity in Chiapas, Mexico; are analyzed to examine how households and communities were articulated and later affected by incorporation into larger sociopolitical entities. The study spans El Lacandón’s foundation in the Late Preclassic period (300 B.C. -A.D. 150), its abandonment as part of its assimilation into the Palenque polity at the beginning of the Classic period (ca. A.D. 150), and its re-foundation as a 2nd level community in the political hierarchy of the Palenque polity at the end of the Late Classic (A.D. 750-850). Economic analyses consider patterns of production and consumption. Obsidian blade manufacturing was organized as a household-level production in both periods, and it was not attached to elite interests during the Late Preclassic, with households of both statuses engaged in paper production, woodworking and paper/cloth imprintings. The pattern changes during the Late Classic, with manufacturing activities restricted to elite households. In terms of consumption, obsidian was available in similar quantities to all households during the Late Preclassic, and became more abundant in elite households during the Late Classic. Ideological patterns of the Late Classic period show that the super-elite household was clearly linked to Palenque’s great tradition expressed in burial practices, according to body position and head orientation. Local elite burials practices were more diverse, which was possibly related to a local little tradition. El Lacandón’s abandonment at the end of the Late Preclassic coincides with the growth of Palenque as a political capital, a pattern frequently observed in cases where rural population moved to growing political capitals. Sociopolitical patterns during the Late Classic were examined by a comparison of civic precinct planning and the differential distribution of elite and commoner households in the districts of the Palenque polity. The analysis concluded that provincial elites exercised less power than the elite of the capital, but were able to negotiate a local identity expressed in Palenque-related elements and also elements of other polities
Numerical analysis of a 3-D printed porous trailing edge for broadband noise reduction
No full textLattice Boltzmann simulations were carried out to investigate the noise mitigation mechanisms of a 3-D printed porous trailing-edge insert, elucidating the link between noise reduction and material permeability. The porous insert is based on a unit cell resembling a lattice of diamond atoms. It replaces the last 20 % chord of a NACA 0018 at zero angle-of-attack. A partially blocked insert is considered by adding a solid partition between 84 % and 96 % of the aerofoil chord. The regular porous insert achieves a substantial noise reduction at low frequencies, although a slight noise increase is found at high frequencies. The partially blocked porous insert exhibits a lower noise reduction level, but the noise emission at mid-to-high frequency is slightly affected. The segment of the porous insert near the tip plays a dominant role in promoting noise mitigation, whereas the solid-porous junction contributes, in addition to the rough surface, towards the high-frequency excess noise. The current study demonstrates the existence of an entrance length associated with the porous material geometry, which is linked to the pressure release process that is responsible for promoting noise mitigation. This process is characterised by the aerodynamic interaction between pressure fluctuations across the porous medium, which is found at locations where the porous insert thickness is less than twice the entrance length. Present results also suggest that the noise attenuation level is related to both the chordwise extent of the porous insert and the streamwise turbulent length scale. The porous inserts also cause a slight drag increase compared to their solid counterpart. Wind Energ
El Tlacuache Núm. 226 (2006). 226 Año 7 (2006) septiembre. El Tlacuache
No full textContra Octavio Paz, el poeta criollo por Ricardo Ferré D´Amaré. - Sobre la participación de la Iniciativa Privada en la explotación del patrimonio histórico. Algunas reflexiones para el caso mexicano a partir de una visita a Machu Picchu y Ayacucho (Perú) por Alfredo Paulo Maya. - El Yauhtli por Margarita Avilés y Macrina Fuentes
Site assessment of multiple sensor approaches for buried utility detection
No full textThe successful operation and maintenance of buried infrastructure within urban environments is fundamental to the conservation of modern living standards. Breakdown in supply of utilities is quickly noticed and requires a swift response to repair the network. Open-cut methods are predominantly used, in preference to trenchless technology, to effect a repair, or replace or install a new section of the network. This is, in part, due to the inability to determine the position of all utilities below the carriageway, making open-cut methods desirable in terms of dealing with uncertainty since the buried infrastructure is progressively exposed during excavation. However, open cut methods damage the carriageway and disrupt society’s functions. This paper describes the progress of a research project that aims to develop a multi-sensor geophysical platform that can improve the probability of complete detection of the infrastructure buried beneath the carriageway. The multi-sensor platform is being developed in conjunction with a knowledge-based system that aims to provide information on how the properties of the ground might affect the sensing technologies being deployed. The fusion of data sources (sensor data and utilities record data) is also being researched to maximise the probability of location. The project has reached a stage where the majority of the sensing technologies being developed for the multi-sensor device have undergone initial testing on site and this has shown some interesting findings. This paper describes the outcome of the initial phase of testing along with the development of the knowledge-based system and the fusing of data to produce utility map
A 2 h periodic variation in the low-mass X-ray binary Ser X-1
No full textSpectroscopy of the low-mass X-ray binary Ser X-1 using the Gran Telescopio Canarias have revealed a ?2 h periodic variability that is present in the three strongest emission lines. We tentatively interpret this variability as due to orbital motion, making it the first indication of the orbital period of Ser X-1. Together with the fact that the emission lines are remarkably narrow, but still resolved, we show that a main-sequence K dwarf together with a canonical 1.4 M? neutron star gives a good description of the system. In this scenario, the most likely place for the emission lines to arise is the accretion disc, instead of a localized region in the binary (such as the irradiated surface or the stream-impact point), and their narrowness is due instead to the low inclination (?10°) of Ser X-1
- …
