Portal de Revistas Académicas UC Temuco
Not a member yet
1040 research outputs found
Sort by
Una carrera hacia los bordes de la sociedad
No full textEsta es una reflexión en torno a un problema de fondo en el análisis antropológico de una forma de marginalidad urbana, la vagabundancia, y de quienes viven de esa forma, los vagabundos. La fuente básica de este relevo reflexivo es la de la etnografía. En este sentido, el material de campo es colocado en un nuevo contexto, el de la escritura ensayística, en el que puede adquirir nuevos matices dependiendo de las vinculaciones que puedan establecerse entre los diversos materiales empíricos, teniendo en cuenta algunas nociones teóricas y conceptuales adecuadas al caso
La "etnicidad marginal" de las comunas de la península de Santa Elena, Ecuador
No full textLas comunas de la Península de Santa Elena representan la continuidad histórica de las antiguas jefaturas Manteño - Huancavilcas. Estas comunas han logrado mantener el control de su territorio y una relativa autonomía socio-económica a lo largo de todo el período colonial y republicano, poniendo en práctica diversas estrategias de articulación con la sociedad dominante. Sin embargo, la supervivencia de estas comunidades se debate, hoy en día, entre las agresiones extemas a su temitodo, y su "etnicidad marginal" que las excluye del marco constitucional ecuatoriano destinado a la protección de los tenitorios étnicos. A continuación se analiza el proceso de resignificación de la diversidad al que están abocadas las comunas de la PSE
Procesos de territorialización Guaraní-Kaiowá y Mapuche: antecedentes histórico- descriptivos para una investigación comparativa
Full text linkEl objetivo de este artículo es ofrecer una descripción histórica y relacional sobre las estrategias de espacialización y demarcación de territorios proyectada en la interacción de poblaciones Guaraní-Kaiowá en el contexto formativo del Estado-nacional brasilero y de los Mapuche en el proceso de formación del Estado-nacional chileno. Nuestra hipótesis es que estos procesos no establecieron una modalidad unilateral, estática y cabalmente impositiva de delimitación espacial, siendo la propia manifestación de una identidad territorial histórica mapuche o guaraní-kaiowá consecuencia de sus intensas relaciones interétnicas. Nuestra intención es que la descripción histórica de ambos procesos nos permita, en el progreso de la investigación, llegar a conclusiones e interpelaciones comparativas
Efficacy of biowaste and bioagent on the growth of coriander and rumex plants.
Full text linkThis investigation was carried out to examine the effect of biowaste (Used Tea powder) and bioagent Trichoderma harzianum (NFCCI 2241) both alone and in combinations on the emergence of seedlings, growth and biomass of Coriander (Coriandrum sativum) and Green sorrel (Rumex acetosa) plants in a pot experiment. The biowaste and bioagent treatments were compared with chemical fertilizer treatment and control. There is a significant variation in the results among the treatments. Germination percentage of Green sorrel was more in the treatments of T2, T3, T4 when compared with T1 treatment. In Coriander, similar trend was observed but the percentage of emergence of seedlings was very much less when compared with Green sorrel. The growth of root and shoot in length in Rumex plants was recorded more with T3 and T1 treatments in coriander plants, whereas root growth was maximum with T3 and T5. For shoot growth, it was maximum in T1, T2 and T3 treatments. Biomass recorded maximum with T3, T4 and T1 treatments in coriander and Rumex plants. Trichoderma harzianum in combination with used tea powder (biowaste) i.e., T3 treatment showed significant effect on the growth and productivity of coriander and Rumex plants
Monsoon associated macroinvertebrate community dynamics in lakes of urban and semi-urban areas of Ranchi, North Eastern India.: Monsoon associated macroinvertebrate dynamics
No full textIn Indian subcontinent monsoon affects billions of lives, even modest alterations in spatiotemporal pattern may lead to significant socioeconomic stress in the region. Monsoon also affect creation, rejuvenation, and sustenance of lakes. Freshwater lakes habitats various biological assemblages that translates in ecological quality of water. During monsoon, heavy inflow of runoff water can significantly alter species assemblages and their association with quality of water. This study evaluated changes in macroinvertebrates dynamics of Ranchi (urban) and Kanke (semi-urban) lakes located in Chota Nagpur Plateau, North-eastern India. Results indicated higher abundance of macroinvertebrate in Ranchi lake than Kanke lake. However, taxa richness was greater in Kanke lake in comparison to Ranchi lake. Monsoon had higher impact on abundance of taxonomic order under family Gastropoda. Post-monsoon increase in abundance of Basommatophora (14%), Neotaenioglossa (14%), and Littorinimorpha (13%) were observed. Likewise, Architaeniogiossa, incertae sedis, Haplotaxida were least affected taxonomical orders during investigated seasons. Both lakes were dominated by collector-gatherers (CG), however, Kanke lake indicated richness in diversity of FFGs. CGs were also less motivated by seasonal alteration before, during and after monsoon. In conclusion, pre-monsoon, monsoon and post-monsoon seasons largely affects abundance of macroinvertebrates in both lakes. Runoff rainwater supports macroinvertebrate development through addition of nutrients. This study indicated that Ranchi lake contains high abundance of scrapers (SC) and grazers (GZ), those are associated with higher anthropogenic activities. Likewise, higher taxonomical richness in Kanke lake indicated more diverse and healthy ecosystem
High efficiency phytoextraction of barium using Amaranthus viridis L.
Full text linkHeavy metal pollutants in the environment are emerging global concern. Barium is one of the heavy metal abundantly used in the manufacture of firecrackers and match industries. This work is aim to eradicate barium from these industrial sites; the new-flanged phytoextraction technology is used to mitigate the metal pollution through hyperaccumulators. Plant used in phytoextraction should accumulate and translocate specific pollutants especially heavy metals. This work aims to assess the tolerance mechanism of Amaranthus viridis L. a selective native hyperaccumulator under barium chloride stress. Morphometric, biochemical, enzymatic activity, accumulation, translocation and mobility of barium form soil to root and leaves were studied in co-cultivated hyperaccumulator (Amaranthus viridis) and hypoaccumulator (Abelmuscus esculentus) at various concentration levels of barium. Amaranthus viridis accumulated fourfold to fivefold barium in roots, shoots and leaves than Abelmuscus esculentusL. This is well understand that Amaranthus viridis showing higher accumulation of barium, more translocation of barium from root to shoot and good mobility. The mobility of barium was increased form level 1 to level 3. It was revealed that the accumulation of barium was more in root and shoot of Amaranthus viridis. It is inferred from the present study that A.esculentus is a hypoaccumulator and is sensitive to barium. When co-cultivated with Amaranthus viridis showing less of metal toxicity because Amaranthus viridis being hyperaccumulator of barium, accumulate more metal and save Abelmuscus esculentus. It is strongly suggest that the hyperaccumulator Amaranthus viridis L. should grown in the barium polluted sites and make the environment sans heavy metal pollution
Numerical analysis of cement panels reinforced with galvanized iron or polypropylene meshes
Full text linkThis paper deals with the numerical analysis of panels reinforced with galvanized iron (GI) or polypropylene (PP) meshes. It has been a common practice to use galvanized iron meshes as reinforcement in panels and is popularly called as ferrocement panels. Elevated humidity level and presence of salts can lead to corrosion of these galvanized iron meshes, leading to reduced service life. A rust-freepolypropylene mesh can be used as an alternate to the steel mesh. This paper presents numerical analysis in ANSYS Workbench based on an experimental study published in the literature” Comparative study of ferrocement panels reinforced with galvanized iron and polypropylene meshes”. A total of 16 rectangular panels tested in flexure was analyzed. Out of 16 panels, 8 were reinforced with GI mesh and 8 with PP mesh. The specimens were simply supported on two short edges and subjected to four-point bending. The parameters investigated include thickness of panels, volume fraction and the material of the mesh. All the GI mesh panels showed better strength than the corresponding PP mesh reinforcedcement panels. However, PP mesh panels exhibited better ductility as compared to GI mesh panels. An increase of 54% is noticed in 40mm thick panels reinforced with GI mesh, when compared to 20mm thick panels. Similarly, an increase of 83% is noticed in 40mm thick panels reinforced with PP mesh, when compared to 20mm thick panels. The results of numerical analysis were found to be comparable with the corresponding experimental results
Hybrid offshore wave energy platform
Full text linkOcean waves are the greatest unexploited renewable energy resource which would reduce our reliance on fossil fuels. It can be harnessed throughout the year using a hybrid offshore platform. In this paper, hybrid offshore wave energy platform and its working principle, is explained explicitly. These devices when use independently are found to be not very efficient in terms of generating energy in a given time when compared to the resources used in establishing them. This in turn discourages the investments which can be made in them. This paper addresses the above issue and provides a solution with the use of hybrid offshore platforms as a step towards exploiting open seawater in a sustainable way to generate energy in a much more efficient way. Combining multiple renewable energy devices in such a manner could potentially offer stable electricity production, despite seasonal changes. The hybrid offshore platforms are conceptual and are undergoing R&D or are in the pre-commercial prototype and demonstration stage. This paper aims to discuss about one such innovative design for a hybrid offshore platform and assess the technical, economic and environmental feasibility of constructing such a platform
Seismic analysis of multi-storeyed building with floating column using fluid viscous dampers.
Full text linkNowadays many multi-storeyed buildings in India have open ground storey for providing better parking facilities, reception lobbies and other amenities. It is required to have column free space due to shortage of space, increase in population and also for functional and aesthetic requirement.For this purpose, building is provided with floating column at one or more storey.Floating column is a vertical member but its lower end is not connected to the foundation. Its lower end rest on beam which is a horizontal member, this beam transfers the load of floating column to other columns below it.The most common use of a floating column is to build a soft storey on the ground floor to provide extra parking or entrance corridor space.But such features are highly unwanted in seismically active region. The present study proposes a practical solution for reducing the risk of earthquake effects associated with floating column building by strengthening them with using fluid viscous dampers. The main aim of the work is to highlights the performance of floating column building and compare floating column building with and without using fluid viscous dampers. Seismic analysis is carried out by using response spectrum analysis as per IS: 1893-2002. The Seismic assessment is executed by using ETABS software
Effect of dust pollution from construction sites on on-site construction workers.
Full text linkThe concern for air pollution and its associated problems are increasing day by day. Unfortunately, construction industry is among the top contributors to air pollution since most of the activities like excavation, tile cutting etc taking place in construction sites result in the generation of dust. These emissions cause negative impacts on humans as well as on the environment. A lack of awareness among construction workers, contractors etc regarding the ill-effects of dust pollution result in these problems not being considered seriously or tackled properly. The identification of dust sources as well as its health consequences and other aspects in construction sites can help increase awareness and aid in the execution of control measures. This could help to reduce dust pollution in construction sites. Here, the health impacts that construction dust cause on on-site construction workers were studied by interviewing the workers. From the data obtained from questionnaire survey, it was found that workers directly involved with dust generating construction activities like wall polishing and tile cutting experienced more health problems compared to other workers. Majority of workers experienced respiratory problems. From correlation analysis, it was found that experience of workers and their age had a moderate correlation with health problems experienced. Some of the dust control measures suggested include regular site monitoring, implementation of control measures designed specifically to reduce the generation of dust from activities causing highest quantities of dust and regular site cleaning