Browsing by Autor "Eduardo Palenque"

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    Análisis de correlación entre actividad solar y columna de ozono a latitudes tropicales
    (2002) Flavio Ghezzi; Pablo Saavedra; Eduardo Palenque; Francesco Zaratti
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    Caracteristicas del viento y del potencial eolico del altiplano central
    (2015) Jesus Encinas; Rene Torrez; Flavio Ghezzi; Eduardo Palenque
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    Cinética del ozono superficial en la atmósfera de la ciudad de La Paz
    (2001) Romina Mendez Torrez; Eduardo Palenque
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    Determinación de la Porosidad de un Hormigón Mediante Medidas Eléctricas
    (Latin American Association for the Advancement of Sciences, 2023) Eduardo Palenque; Edwin Choque
    En este trabajo se presenta un método alternativo para la medida de la porosidad de los hormigones ya consolidados, basado en medidas eléctricas. Se aprovecha las relaciones conocidas entre la resistencia mecánica y la porosidad; además de la nueva propuesta de estandarizar la medida de la resistencia mecánica a través de la medida de resistividad eléctrica. Trabajando con los conceptos teóricos y realizando aproximaciones en las ecuaciones base, se presenta una fórmula que relaciona la resistividad eléctrica y la porosidad.
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    Diurnal Circulation of the Bolivian Altiplano. Part I: Observations
    (American Meteorological Society, 2005) Joseph Egger; Luis Blacutt; Flavio Ghezzi; Richard Heinrich; Philip Kolb; Stephan Lämmlein; Martin Leeb; Stephanie Mayer; Eduardo Palenque; Joachim Reuder
    In July and August 2003 a field campaign was conducted to explore the diurnal circulation of the Bolivian Altiplano. Vertical soundings by remote-controlled aircraft yielded profiles of temperature, pressure, and humidity at six passes and in a valley. Pilot balloon observations provided wind profiles. Two permanent stations collected additional data. Typically, inflow toward the Altiplano commences a few hours after sunrise at about the time when the stable nocturnal layer near the ground is transformed by the solar heating into an almost neutrally stratified convective boundary layer. The depth of the inflow layer is comparable to but normally less than that of this boundary layer. There are indications of return flow aloft. The inflow continues at least until sunset. Moisture is imported at the passes leading to the Yungas in the east. Strong upvalley flows were found in the valley of the Rio de La Paz, which connects the wide canyon of La Paz with the tropical lowlands to the east. Inflow was absent at one of the passes despite favorable synoptic conditions. Cases of synoptically forced flows are presented as well where the diurnal signal is difficult to separate. A simple flow scheme is presented that fits the observations reasonably well.
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    Efectos de la radiación ultravioleta sobre la quinua (Chenopodium quinoa Willd.)
    (1997) Eduardo Palenque; Marcos Andrade; Juan Antonio González; Ricardo Forno; Valeria Lairana; Fernando E. Prado; Juan Carlos Salcedo; Sara Urcullo
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    EFECTOS DE LOS CAMBIOS CLIMÁTICOS SOBRE LOS BOSQUES DE ALTURA EN EL ALTIPLANO
    (2022) VANESA SERRUDO; HEIDY MONTECINOS; MARÍA ELENA ANGULO; Peter Zabala Medina; Eduardo Palenque
    The keñua tree (Polylepis tarapacana), found at 5200 m a.s.l. in the Andes Mountains, grows at the highest treeline in the world. We measured the thermal conduction coefficient of keñua bark samples taken from different locations within the Andes Mountains. These measurements were used to find a correlation between environmental inputs and high altitude plant defence mechanisms. We found a new classification method to identify the origin of plant samples.
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    EL POTENCIAL EÓLICO DE LAS JUNTAS
    (2009) Flavio Ghezzi; Eduardo Palenque
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    ELIMINACIÓN DE CIANURO MEDIANTE SISTEMA COMBINADO UV/H2O2/TiO2
    (2011) Luz Quispe; María del Carmen Arteaga; Édgar Enrique Martínez Cárdenas; Luis López c; Carlos Santelices; Eduardo Palenque; Saúl Cabrera
    In the present work, aqueous cyanide has been eliminated by addition of H2O2 as oxidant agent, and by heterogeneousphotocatalysis with titanium oxide activat...
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    Ensayos de impacto sobre la jatata (Geonoma deversa) bajo diversos tratamientos físicos
    (2011) Eduardo Palenque; Flavio Ghezzi; Carol Yohanna Rojas Vargas
    La jatata (Geonoma deversa) es una palmera tropical con un larga historia de aprovechamiento tradicional para la elaboraci´on de pa ˜nos utilizados para techados de adorno, que son elaborados principalmente por el grupo ´etnico T’simane. Estos pa ˜nos han sido introducidos y comercializados en el ´area urbana de las tres capitales principales de Bolivia, sufriendo un deterioro en la estructura misma de la hoja, principalmente en la ciudad de La Paz, lo que provoca una dram´atica disminuci´on en su tiempo de vida, siendo las causas posibles de este da ˜no las condiciones clim´aticas a las que fueron expuestas. En este trabajo se realiz´o un estudio de la fragilidad de las hojas de jatata bajo cambios t´ermicos, h´idricos, y exposiciones a radiaci´on UV. Se encontr´o que los ciclos diarios de humedad de La Paz (saturaci ´on a seco) causan los mayores da ˜nos a las hojas de jatata
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    Estudio preliminar del efecto de la altura sobre la radiación solar ultravioleta B
    (1998) Marcos Andrade; R Forno; Eduardo Palenque; F Zarati
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    EVALUACIÓN DE ESTRUCTURAS DE HORMIGÓN UTILIZANDO EL EQUIPO EYECON DE ULTRASONIDO, MEDIANTE TECNICAS COMPUTACIONALES PARA LA RECONSTRUCCIÓN DE LA IMAGEN SAFT
    (2023) ELBA J. COLQUE ZACARÍAS; Eduardo Palenque
    A new algorithm is proposed based on the SAFT method of END that allows for the management and processing of data from the EYECON equipment without the need for the original device program. In order to characterize the behavior of the wave signal within a medium, a regular classification concrete block with a thickness of 30 𝑐𝑚 was elaborated. Measurements were carried out at different speeds at a frequency of 50 𝑘𝐻𝑧 in order to compare the results of the behavior of the wave signal intensity, between the original program and the one developed in this study. This allows us to determine with greater precision the delimitations of the zones: dead, near field and far field, which helped us to determine the operating characteristics of the equipment.
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    High Levels of Resveratrol in Grapes Cultivated at High Altitude Valleys in Bolivia
    (Taylor & Francis, 2014) Marco Taquichiri; Ruth Ayarde; Pastor Gutierrez; Atma‐Sol Bustos; Carolina Paredes; Juan Carlos Callisaya; Juan Carlos Surco; Eduardo Palenque; Flavio Ghezzi; Juan Alvarado
    Trans-resveratrol, total antioxidant capacity (TAC), and total phenolic compounds were assessed in Bolivian grape cultivars collected at high altitude valleys. The TAC of the grapes ranged from 0.8 to 22 μmol Trolox equivalents/g dry matter determined by 2,2′-azino-bis(3-ethylbenzthiazoline-6-sulphonic acid), and from 0.6 to 10 determined by the ferric reduction antioxidant power. In the present study, we observed that under certain conditions trans-resveratrol levels in Bolivian grapes are 10-fold higher than the reported data from the literature. Additionally, the temporal evolution in three different solar ultraviolet-B radiation levels was carried out to understand their effect on the oxidative processes.
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    High-Altitude Experimental Test of the Wind-Wave Interaction Models
    (2021) Alexander V. Babanin; Eduardo Palenque
    <p>We present the idea to experimentaly test the empirical models used in fluid mechanics. The models consider that the waves develop due the wind energy trasferred from the air to the urface of the water. However, all of those models were validated considering data at sea level, with effectively fixed air density. Here we propose to test the adjustment of the empirical coefficients studying the waves generated in Lake Titikaka, which is located at an altitute high enough (3800 m) to have a reduced atmospheric pressure. Lake Titikaka is located in the North side of the Altiplano (high plateu) in South America. It is shared between Bolivia and Peru, and it is, by far, the largest water body in the region, and at such altitudes in general. So it becomes a dominant geographical and climatic unit in the South American Altiplano, which has a desert–like climate, with monsoon-type rainy season (November to February) and a long dry season (March to October). During the dry season (local winter) the daily temperature cycle goes from maxima around 15 °C (past noon) to freezing minima near -5 °C (before dawn). This temperature span is larger than the seasonal difference, around 5 °C, between summer and winter. Due to its large water mass, the Lake hampers the temperature variations and avoids the freezing of both the lake itself and its shores. The daily temperature fluctuations cause also a daily wind-intensity cycle, with maxima just before the sunset. Lake Titikaka has an alongated shape with a long axis of 120 km in the NW-SE direction, and its short axis of 50 km in the NE-SW direction; with a large peninsula on the South shore (Copacabana). This size, plus deep waters (in excess of 250 m, pelagic condition) allows development of extnsive waves produced by the surface winds, coming predominantly from the North. The shores of Lake Titikaka have several geographical features, among others: delta rivers, sandy beaches and rock cliffs. The (“main”) study site is located in the large portion of the lake, near a mid-point between Santiago de Huata and the Isla de la Luna (Moon Island) as far possible from the shores.</p>
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    Investigations on the effect of high surface albedo on erythemally effective UV irradiance: Results of a campaign at the Salar de Uyuni, Bolivia
    (Elsevier BV, 2007) Joachim Reuder; Flavio Ghezzi; Eduardo Palenque; Rene Torrez; Marcos Andrade; Francesco Zaratti
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    Las desigualdades de Bell
    (1997) Eduardo Palenque; Oscar Daniel López Bernal
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    Las implicaciones filosóficas de teorema de Bell
    (1997) Eduardo Palenque
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    Medidas de RUV-B en una localidad en altura: El caso de La Paz, Bolivia
    (1997) Marcos Andrade; R.N Forno; Eduardo Palenque; Francesco Zaratti