oalib
Search Results: 1 - 10 of 78 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /78
Display every page Item
First bird remains from the Eocene of Algarrobo, central Chile
Yury-Yá?ez,Roberto E; Otero,Rodrigo A; Soto-Acu?a,Sergio; Suárez,Mario E; Rubilar-Rogers,David; Sallaberry,Michel;
Andean geology , 2012, DOI: 10.5027/andgeoV39n3-a010
Abstract: paleogene records of birds in the eastern margin of the pacific ocean have increased in recent years, being almost exclusively restricted to fossil sphenisciformes (penguins). new avian remains (ornithurae, neornithes) from middle-to-late eocene levels of the estratos de algarrobo unit, in algarrobo, central chile, are disclosed in the present work. these new finds are significant in representing the first non-spheniscid bird remains of middle to late eocene age, recovered in mid-latitudes of the eastern pacific and probably belonging to a procelarid. it complements the regional record of eocene birds, previously known only at high-latitudes such as seymour island (antarctica) and magallanes (chile), and low-latitude locations in peru.
Assessing Quality of Reclaimed Urban Wastewater from Algarrobo Municipality to Be Used for Irrigation  [PDF]
Desireé Mu?oz-Sánchez, Veronika Bogodist, Vicente Manuel García-Ca?izares, David Frías-Gil, María Remedios López-Díaz, Emilio Jaime-Fernández, María Remedios Romero-Aranda
Journal of Water Resource and Protection (JWARP) , 2018, DOI: 10.4236/jwarp.2018.1011064
Abstract: In the European Mediterranean area, the lack of available water resources had led to consider the reclaimed urban waters as an integral part of water resources. Reclaimed urban waters could mitigate water shortage, support agriculture sector and protect rivers and groundwater resources. This work is focused on the evaluation of reclaimed urban water (RW) from Algarrobo municipality, which is located in the Málaga province in the Mediterranean coast at South-East of Spain. Wastewater in the municipal waste water treatment plant, was treated by a membrane bioreactor (MBR) as a tertiary treatment. The main goal of this work was to determine the composition of RW to be compared with fresh local water (LW) from the Algarrobo River, in order to evaluate its suitability for irrigation. Electrical conductivity (EC), pH, sodium absorption ratio (SAR), and mineral content were weekly measured from September 2017 until June 2018. Assessment of RW quality was carried out considering the limit values for each parameter as stated by the current Spanish legislation RD 1620/2007 for reuse of reclaimed water and European Directive for water reuse (EU 91/271/EEC, Annex I). The MBR facility was also focused on preserving essential minerals for plant nutrition to use them for crop fertilization instead of commercial fertilizers. The average content of nitrogen, phosphorous and potassium were, respectively, 72%, 65% and 46% of the amount needed for the Hoagland 1/4 strength solution that was used in this study for irrigation of tomato, avocado and mango crops. From this study it appears that it is possible using membrane technology, to treat urban wastewater in order to supply a good quality of water for irrigation. Water analysis has also proved MBR to be efficient for removal of microbiological pollutants, inorganic compounds, some trace elements and heavy metals. The assessment of RW shows that the evaluated parameters of water-quality are within the range of values stated by Spanish legislation and the current European Directive for secure use of reclaimed water for irrigation.
CARACTERIZACIóN DEL GAS DE SíNTESIS OBTENIDO A PARTIR DE ALGARROBO Y BAGAZO DE CA A CARACTERIZA O DE GáS COM ALGARROBO E BAGA O DE CANA CHARACTERIZATION OF GAS OBTAINED WITH THE ALGARROBO AND SUGARCANE BAGASSE  [cached]
GERARDO CABRERA,SANTIAGO MADRI?ANA,DEYANIRA MU?OZ A
Biotecnología en el Sector Agropecuario y Agroindustrial , 2012,
Abstract: Se gasificó biomasa de madera y carbón del algarrobo (árbol autóctono del Valle geográfico del río Cauca) y del bagazo de ca a. De la gasificación separada de cada una de ellas se obtuvo gas de síntesis, el cual se refinó y se caracterizó químicamente. Se determinó la eficiencia del proceso y del equipo mediante los balances de masa y energía. Se obtuvo un poder calorífico superior de 4 MJ/Nm3, mostrando su potencial como combustible en motores de combustión interna. Se concluye que la madera presenta la mejor eficiencia del 77% en comparación al 71% y 70% del bagazo y del carbón respectivamente. Biomassa de madeira, carv o de alfarroba (feito a partir de uma árvore autóctone do rio Cauca vale) e baga o de cana foram gasificated. A partir da gaseifica o separada de cada um deles, gás de síntese foi obtido, que foi refinada e caracterizados. que a eficiência do processo e do equipamento foi determinada por uma avalia o da massa e do balan o de energia. Um poder calorífico até 4 MJ/Nm3 foi obtido a exibir o seu potencial como combustível em motores de combust o interna. Concluiu-se que a madeira apresenta a melhor eficiência de 77% em compara o com 71% de baga o e 70% de carv o. Wood biomass, carob coal (made from an autochthonous tree of the Cauca river valley) and cane bagasse were gasificated. From the separate gasification of each of them, synthesis gas was obtained, which was refined and chemically characterized. it the efficiency of the process and of the equipment was determinate by an evaluation of the mass and energy balance. A calorific power up to 4 MJ/Nm3 was obtained showing its potential as fuel in internal combustion engines. It is concluded that the wood presents the best efficiency of 77% compared to 71% of bagasse and 70% of coal.
Estudios termométricos de granitoides de Algarrobo del águila, provincia de La Pampa Thermometric Studies from Algarrobo del Aguila granitoids, province of La Pampa  [cached]
T Montenegro,S Quenardelle,E Llambías
Revista de la Asociación Geológica Argentina , 2003,
Abstract: Los plutones graníticos de Algarrobo del águila, provincia de La Pampa, forman parte del Complejo Intrusivo Algarrobo del águila y afloran en el bloque de Las Matras. Tienen edad permo-triásica y constituyen cerros de escasa altura. Los principales afloramientos son Puesto Los Cerros, Puesto Las Tinajeras y Cerro Colorado. Hacia el oeste, cerca del límite con Mendoza, se encuentra, en forma aislada, el monzogranito de Chos Malal. Las edades obtenidas por el método K/Ar sobre roca total son de 256,8 ± 5,5 Ma para Cerro Colorado y 197,9 ± 3,9 Ma para Puesto Los Cerros. Los cuerpos ígneos se caracterizan por una amplia variación textural con transición hacia términos volcánicos, indicativos de una rápida cristalización en ambientes de profundidad somera. La cristalización del cuarzo tiene lugar bajo diferentes presentaciones. A partir de 370o y hasta 260°C los megacristales de cuarzo capturaron fluidos de composición compleja H2O-NaCl-CO2, con salinidad elevada y concentración de CO2 no mayor a 0,04% molar. En las miarolas, el cuarzo cristalizó entre 335o y 235°C y en las venas entre 330o y 300°C, con salinidades de hasta 14% equivalente en peso NaCl. Los feldespatos potásicos tienen un grado de ordenamiento intermedio lo que indica un enfriamiento rápido a temperaturas inferiores a 400°C. Estas temperaturas son congruentes con la cristalización de microclino sin las maclas según leyes de Albita-Periclino. La presencia de minerales como fluorita, apatito y turmalina, sumado a todas las anteriores características, son indicativos de la cúpula de un plutón emplazado en niveles someros. The granitic stocks of Algarrobo del Aguila, in the province of La Pampa, are assembled in "Complejo Intrusivo Algarrobo del Aguila" and they crop out in Las Matras Block forming smooth and small hills. Main outcrops of these Permian-Triassic granites are Puesto Los Cerros, Puesto Las Tinajeras and Cerro Colorado. The isolated outcrops of the Chos Malal monzogranite are close to the border with the province of Mendoza. Two new K/Ar whole rock ages yielded 256.8 ± 5.5 Ma for the Cerro Colorado aplite and 197.9 ± 3.9 Ma for the Puesto Los Cerros aplite. The granites show a wide textural variety, from fully plutonic to volcanic ones indicating a quick process of crystallization in a high level of the crust. Quartz crystallized in different modes. Complex composition fluids (H2O-NaCl-CO2) with high salinity, were captured from 370 to 260°C in megacrysts. The CO2 did not pass 0.04% molar. The miarolitic quartz crystallized between 335 and 235°C, and the quartz of the veins between
Shoreline changes in Concón and Algarrobo bays, central Chile, using an adjustment model
Martinez,Carolina;
Investigaciones marinas , 2007, DOI: 10.4067/S0717-71782007000200010
Abstract: adjustment models for both algarrobo and concón bays, central chile, are presented herein; the results show a nearly logarithmic spiral shape for the shore. spatial-temporal variations in the shorelines of both bays were found based on aerial photographs from different years. the results indicate important variations in the relative position of the concón bay shoreline between 1945 and 2006, with extreme oscillations (-368 to 123.8 m) only occurring in the proximal zone, where the aconcagua estuary is located. on the other hand, the spatial-temporal variations in the algarrobo bay shoreline between 1967 and 2006 are moderate (131 in the proximal and -73 in the distal zone). whereas concón bay exhibits a stable state of equilibrium for the past 60 years, if the estuary zone is excluded, algarrobo bay presents a stable state with a tendency for growth in the proximal zone and retreat in the distal zone. the results are discussed in terms of coastal changes associated with highly urbanized shorelines and applications for coastal area management that are derived from the models
Carbonization of "Algarrobo Negro" (Prosopis Nigra,): a study of its microstructure and main volatile components
López Pasquali,C.E; Wottitz,C. A.; Martinez,R.G.; Herrera,H. A.;
Latin American applied research , 2002,
Abstract: modifications in the microstructure of wood from algarrobo negro (prosopis nigra) in function of the temperature were studied by scanning electronic microscopy (sem). some non condensable gases obtained by isothermal pyrolysis were investigated employing gas chromatography (gc). the results showed that the basic anatomic structure of wood remains almost unchanged in the working temperature range. it was also found that in the gas phase and with increasing temperature, the concentrations relative to carbon monoxide and water decrease whereas there is a pronounced increase in the concentration of methane from 300oc.
Tiempos, rendimientos y costos del aserrado de Algarrobo blanco (Prosopis alba) en Santiago del Estero, Argentina
Coronel de Renolfi,M.; Díaz,F.; Cardona,G.; Ruiz,A. P.;
Quebracho (Santiago del Estero) , 2012,
Abstract: the prosopis alba wood is one of the most sought after by furniture manufacturers, due to, among other qualities, its excellent grain and nobility that enables processing without drying. in santiago del estero, there are not studies about lumber recovery, productivity and costs of sawn timber in general or in particular prosopis alba. therefore an evaluation of the working times, lumber recovery and productivity of sawing process was carried out into ten small sawmills from santiago del estero province. the aim was to estimate the costs of sawing. for this purpose, 40 logs of prosopis alba with a volume of 9.47 m3 without bark were sawed. these logs generated 260 boards of different dimensions with a sawed volume of 5.59 m3, indicating a lumber recovery factor of 58% with bark. the average time process was 920 seconds. productivity was established in 232 ft2/h. the direct cost of sawing amounts to $2.33/ft2.
Almacenamiento de barras de cereales elaboradas con cotiledones de algarrobo (Prosopis chilensis (Mol) Stuntz)
Escobar A.,Berta; Estévez A.,Ana María; Gui?ez C.,M Alejandra;
Archivos Latinoamericanos de Nutrición , 2000,
Abstract: storage of cereal bars with mezquite cotiledon (prosopis chilensis (mol) stuntz). the use of walnut or peanut in the elaboration of cereal bars represents a possible risk of undesirable changes during their storage due to their high content of unsaturated fatty acids in the oil; oxidizing of the fatty acids is one of the main causes of deterioration. development of new snack products implies the use of packages that should protect the food against the damage caused by light and reduce the oxygen concentration of in their interior. the objective of this investigation was to evaluate the physical, chemical and sensory changes in the storage of cereal bars with peanut or walnut and mezquite cotiledon subjected to two thermal treatments, packed in cellophane or milky polypropilene. four types of bars were elaborated with 6% of mezquite cotiledon, treated by microwaves or toasted, and with 18% of peanut or walnut. the bars were stored for 90 days at room temperature; and each 30 days it was measured moisture content, peroxides index, water activity, sensory quality and acceptability. the peroxides values (4.9-13.8 meq/kg of oil) indicates that the shelf life of the bars in all the studied treatments was 90 days. the packaging material s used allows to maintain in good conditions, for 3 months, the cereals bars of moisture (7.4-11.2%), water activity (0.50-0.65) and sensory acceptability.
Finding of a Holocene marine layer in Algarrobo (33°22'S), central Chile: Implications for coastal uplift
Encinas,Alfonso; Hervé,Francisco; Villa-Martínez,Rodrigo; Nielsen,Sven N; Finger,Kenneth L; Peterson,Dawn E;
Revista geológica de Chile , 2006, DOI: 10.4067/S0716-02082006000200007
Abstract: a buried holocene marine bed was discovered upon drilling a water well in algarrobo (33°22's), located on the coast of central chile. radiocarbon dating of a wood fragment found within the deposit indicates an age of 6450 cal yr bp. the top of this bed, 0.25 m-thick, was reached at an elevation of 3.8 m above mean sea level. this bed contains abundant monospecific faunas of foraminifers (ammonia tepida) and ostracodes (cyprideis beaconensis), indicative of deposition in a very shallow, transitional marine environment. palynologic analysis reveals a chenopodiaceae-dominated (~70%) assemblage, indicating a relatively arid and warm climate
Propiedades farmacológicas del Algarrobo (Hymenaea courbaril Linneaus) de interés para la industria de alimentos
Alzate Tamayo,Luz María; Arteaga González,Diana María; Jaramillo Garcés,Yamilé;
Revista Lasallista de Investigación , 2008,
Abstract: hymenaea courbaril l., or carob tree, commonly known in spanish as algarrobo, guapinol, locust, jatobá or courbaril, among many other names, is a huge forest tree that produces big and very hard pods containing a pulp with a penetrating scent, but this pulp is edible and the seeds of the fruit have a great size. it is well known because of its multiple antibacterial, antifungal, anti-parasitic and nutritional properties, based on its chemical and bromatological characteristics. the pulp of this fruit contents a fiber rich in antioxidant substances and with a high capacity of water absorption. the great quantity of chemical substances found in the different parts of this plant makes it to be considered as an interesting source of future investigations, regarding the obtaining of natural preservatives, compounds with a capacity of water retention and ingredients with antioxidant capabilities that can be used in foods without any potential risk for the consumer's health.
Page 1 /78
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.