خيارات البحث
النتائج 121 - 130 من 1,327
La fiscalidad del agua de riego en la UE النص الكامل
2019
Expósito, Alfonso | Montilla-López, Nazaret M. | Berbel, Julio
La fiscalidad sobre el uso del agua incluye diferentes tipos de impuestos y tarifas para financiar los servicios del agua en los países de la Unión Europea. Este trabajo pretende ofrecer una visión general sobre los impuestos y tarifas de agua aplicados en algunos de los países de la UE (especialmente del arco mediterráneo) al uso agrícola del agua, el cual representa una alta proporción del total de las extracciones de agua. En estos países se han implementado diferentes sistemas fiscales sobre las extracciones de agua con el objetivo de recuperar parte de los costes de los servicios, tal y como promueve la Directiva Marco de Aguas. Sin embargo, España es el único país que no recupera ningún tipo de coste relacionado con el uso de aguas subterráneas. Por otro lado, los países del norte de Europa (ej. Países Bajos, Alemania y Dinamarca), no tienen ningún instrumento fiscal para recuperar los costes derivados del servicio de suministro al regadío ni del uso de agua subterránea.
اظهر المزيد [+] اقل [-]Uso da água nas unidades de produção de leite. النص الكامل
2019
WINCKLER, L. T.
Territorios del agua, patrimonio y turismo en Galicia interior النص الكامل
2019
Uña-Álvarez, E. | Villarino-Pérez, M. | Álvarez-Vázquez, M. A.
4 pages | El objetivo de este trabajo es mostrar una visión de conjunto de los estudios elaborados por investigadores de la Universidad de Vigo (grupo geaat, Campus de Ourense) y de la Universidad de Santiago de Compostela en colaboración con el grupo tudistar (Universidad Autónoma de Barcelona). Las áreas objeto de investigación corresponden a territorios del agua en la Galicia interior, en su mayor parte sistemas fluviales.En estos espacios el agua es un elemento vital del territorio. El enfoque de las investigaciones considera los valores del patrimonio y el paisaje del agua, además del potencial que presenta como elemento significativo para el turismo y la educación patrimonial | Peer reviewed
اظهر المزيد [+] اقل [-]NOVA TECNOLOGIA DE MONITORAMENTO DE ÁGUA SUBTERRÂNEA Geotecnologia dProbe النص الكامل
2019
NILTON SILVA | MARCELO HENRIQUE FRITZ | NILTON JORGE MIYASHIRO | MARCOS TANAKA RIYIS | LUIZ FERNANDO MILIORINI
Este trabalho apresenta a geotecnologia dProbe de investigação de água subterrânea em alta resolução, um novo conceito de instrumental de grande versatilidade para amostragem de água subterrânea multinível e nível único, onde diversas limitações dos poços convencionais e multiníveis foram superadas ou minimizadas, sem deixar de atender a essência das normas em vigor. Ao final, são apresentados alguns resultados comparativos do desempenho de purga e amostragem entre um poço convencional e um poço dProbe de nível único, realizados no Centro Universistário SENAC em área não contaminada.
اظهر المزيد [+] اقل [-]Calidad del agua utilizada para consumo humano en el Salar de Pipanaco : Catamarca | Quality of water used for human consumption in the Salar of Pipanaco. Catamarca النص الكامل
2019
Saracho, Marta | Segura, Luis Alberto | Lobo, Patricia | Aguero, N.
El acuífero freático es la única fuente de agua para consumo humano en puestos del Salar de Pipanaco, Pomán, provincia de Catamarca. El objetivo es determinar la calidad química del agua utilizada para bebida por las poblaciones de los parajes: Taco Suna, San Jerónimo, Tucumanao, Balde de la Pampa, San Nicolás, Puesto Corazón de Jesús, San Roque, Maderera de San Antonio y Zapi Cruz, ubicados en el Salar de Pipanaco y su relación con los aspectos hidrogeológicos del área. Se determinaron las concentraciones de iones mayoritarios y minoritarios, se caracterizó geoquímicamente la calidad del agua utilizando los diagramas de Schoeller y Piper, se evaluó su aptitud en función del CAA y la OMS y se analizaron antecedentes hidrogeológicos del Salar de Pipanaco. La magnitud de exposición de las personas a enfermedades de origen hídrico es alta ya que las concentraciones de fluoruro, arsénico y sulfato superan los límites para consumo humano fijados por las normativas consultadas. | The freatic aquifer is the only source of water for human consumption at posts in the Salar de Pipanaco, Pomán, province of Catamarca. The objective is to determine the chemical quality of the water used for drinking by the populations of the places: Taco Suna, San Jerónimo, Tucumanao, Balde de la Pampa, San Nicolás, Puesto Corazón de Jesús, San Roque, Maderera de San Antonio and Zapi Cruz, located in the Salar de Pipanaco and its relationship with the hydrogeological aspects of the area. The concentrations of major and minor ions were determined, water quality was geochemically characterized using the Schoeller and Piper diagrams, their aptitude was evaluated according to the CAA and the WHO and hydrogeological antecedents of the Salar de Pipanaco were analyzed. The magnitude of exposure of people to hydric origin diseases is high since the concentrations of fluoride, arsenic and sulfate exceed the limits for human consumption set by the regulations consulted. | Asociación Argentina de Energías Renovables y Medio Ambiente (ASADES)
اظهر المزيد [+] اقل [-]Propuesta de un sistema para mejorar la calidad de agua de la junta administradora de agua y saneamiento regional San José de Cutuglagua النص الكامل
2019
Betancourth Salazar, Diana Patricia | Sánchez Jaramillo, Karen Daniela
El presente proyecto muestra el proceso realizado para la selección de un sistema de mejora de la calidad de agua de la Junta de Agua y Saneamiento Regional San José de Cutuglagua. Se empezó con la realización de una caracterización en diferentes puntos del recorrido del sistema, se realizaron análisis fisicoquímicos y microbiológicos, los cuales ofrecen una idea de cómo se encuentra el estado del agua actualmente. A partir de esos resultados se buscaron alternativas para mejorar la calidad, se las compararon y se escogieron las que se adaptaron más a las necesidades de la comunidad. Finalmente, se diseñó la alternativa de acuerdo a las características del lugar, siendo esta la mejora de la captación, conducción y desinfección del agua, la cual se presentó a la comunidad junto con el informe de costos y una propuesta donde la comunidad se pueda guiar por sus propios medios. | This project shows the process carried out to select a system that improves the water quality of the San José de Cutuglagua Regional Water and Sanitation Board. It began with the water characterization in different points of the system. Physicochemical and microbiological analyzes were performed, which offered an idea of how water is. Based on these results, alternatives were sought to improve quality. These alternatives were compared and those that were most suitable for the community needs were chosen. Finally, the alternative was designed according to the characteristics of the place, this being the improvement of water collection, conduction and disinfection, then it was shown to the community along with the cost report and a proposal with which the community can be guided in the process by their own means. | Guerra Salcedo, Santiago Stalin, director
اظهر المزيد [+] اقل [-]Rice grass used for water phytoremediation with varying concentrations of 17α-ethinylestradiol hormone = Capim arroz na fitorremediação de água com concentrações variadas do hormônio 17α-etinilestradiol النص الكامل
2019
Rayssa Thainá de Paiva Alves | Braga, Luana Aparecida Silvestre | Braga, Luana Aparecida Silvestre | Fernandes, Katiúcia Dias | Andrade, Sandro José de | Alley Michael da Silva Procópio
Rice grass used for water phytoremediation with varying concentrations of 17α-ethinylestradiol hormone = Capim arroz na fitorremediação de água com concentrações variadas do hormônio 17α-etinilestradiol النص الكامل
2019
Rayssa Thainá de Paiva Alves | Braga, Luana Aparecida Silvestre | Braga, Luana Aparecida Silvestre | Fernandes, Katiúcia Dias | Andrade, Sandro José de | Alley Michael da Silva Procópio
17α-ethinylestradiol (EE2), an endocrine disruptor (ED) excreted by women and is found in contraceptive and hormone replacement pills used at menopause. An increase in EDs requires alternative means of water and sewage treatment, since these compounds threaten human health and the environment, even at trace levels. Phytotechnology stands out from other processes because it is sustainable, given that plants are used to recover the contaminated environment. Thus, the objective of this study was to evaluate rice grass performance in the removal of 17α-ethinylestradiol (EE2), and determine the effect of this hormone on the root anatomy and chlorophyll content of the species. A completely randomized design was used with 4 replications: EE2 concentration composed of 4 study treatments (420, 300, 180 and 60 μg L-1 EE2) and 2 control treatments (positive and negative). The effect of the treatments was evaluated over time (1, 7 and 15 days). EE2 removal from the solution was analyzed by HPLC. Chlorophyll was analyzed by UVvis spectrophotometry, showing that EE2 does not interfere with the photosynthetic activity of rice grass. Aerenchyma was analyzed by microphotographs of root sections, revealing a higher proportion in plants exposed to the hormone, indicating morpho-anatomical adaptations to survive in this medium. Thus, it can be concluded that rice grass has significant phytoremediation potential after 7 days’ exposure, surviving and adapting to the contaminated environment, and can be used to complement water and sewage treatments. = O 17α-etinilestradiol (EE2) é um interferente endócrino (IE) liberado pelo organismo feminino e encontrado em remédios contraceptivos e de reposição hormonal na menopausa. A ascensão dos IEs requer meios alternativos de tratamento de água e esgoto, pois esses compostos ameaçam a saúde humana e o meio ambiente, mesmo em nível traço. A fitotecnologia vem se distinguindo dos demais processos por ser sustentável, tendo em vista que a recuperação do meio contaminado é feita através de plantas. Assim, objetivou-se com este trabalho avaliar o capim arroz na remoção do 17α-etinilestradiol (EE2), bem como verificar o efeito desse hormônio na anatomia radicular e no teor de clorofila dessa espécie. O experimento foi conduzido em delineamento inteiramente casualizado, com 4 repetições. Os tratamentos consistiram das concentrações de EE2 (420, 300, 180 e 60 μg L-1), mais dois controles (positivo e negativo). O efeito dos tratamentos foi avaliado no tempo, sendo: 1, 7 e 15 dias (tempo de remediação). A análise da remoção do EE2 da solução foi feita por HPLC. A análise da clorofila foi feita por espectrofotômetro UV-vis e mostrou que o EE2 não interfere na atividade fotossintética de capim arroz. A análise dos aerênquimas foi executada por microfotografias de secções das raízes, revelando maior proporção de aerênquimas nas plantas que tiveram contato com o hormônio, indicando adaptações morfoanatômicas para sobreviverem nesse meio. Sendo assim, a espécie tem alto potencial fitorremediador com 7 dias de exposição, sobrevivendo e se adaptando no ambiente contaminado, podendo ser empregada como complemento em tratamentos de água e esgoto.
اظهر المزيد [+] اقل [-]Rice grass used for water phytoremediation with varying concentrations of 17α-ethinylestradiol hormone النص الكامل
2019
Rayssa Thainá de Paiva Alves | Luana Aparecida Silvestre Braga | Katiúcia Dias Fernandes | Sandro José de Andrade | Alley Michael da Silva Procópio
17α-ethinylestradiol (EE2), an endocrine disruptor (ED) excreted by women and is found in contraceptive and hormone replacement pills used at menopause. An increase in EDs requires alternative means of water and sewage treatment, since these compounds threaten human health and the environment, even at trace levels. Phytotechnology stands out from other processes because it is sustainable, given that plants are used to recover the contaminated environment. Thus, the objective of this study was to evaluate rice grass performance in the removal of 17α-ethinylestradiol (EE2), and determine the effect of this hormone on the root anatomy and chlorophyll content of the species. A completely randomized design was used with 4 replications: EE2 concentration composed of 4 study treatments (420, 300, 180 and 60 μg L-1 EE2) and 2 control treatments (positive and negative). The effect of the treatments was evaluated over time (1, 7 and 15 days). EE2 removal from the solution was analyzed by HPLC. Chlorophyll was analyzed by UVvis spectrophotometry, showing that EE2 does not interfere with the photosynthetic activity of rice grass. Aerenchyma was analyzed by microphotographs of root sections, revealing a higher proportion in plants exposed to the hormone, indicating morpho-anatomical adaptations to survive in this medium. Thus, it can be concluded that rice grass has significant phytoremediation potential after 7 days’ exposure, surviving and adapting to the contaminated environment, and can be used to complement water and sewage treatments.
اظهر المزيد [+] اقل [-]Environmental determinants of total evaporative water loss in birds at multiple temperatures | Determinantes ambientales de pérdida total de agua por evaporación en aves a múltiples temperaturas النص الكامل
2019
Song, Soorim | Beissinger, Steven R.
Endotherms dissipate heat to the environment to maintain a stable body temperature at high ambient temperatures, which requires them to maintain a balance between heat dissipation and water conservation. Birds are relatively small, contain a large amount of metabolically expensive tissue, and are mostly diurnal, making them susceptible to physiological challenges related to water balance and heat dissipation. We compiled total evaporative water loss (TEWL) measurements for 174 species of birds exposed to different temperatures and used comparative methods to examine their relationships with body size, ambient temperature, precipitation, diet, and diel activity cycle. TEWL in the thermoneutral zone (TNZ) was associated primarily with body mass and activity phase. Larger and more active-phase birds, with their higher metabolic rates, lost more water through evaporation than smaller, resting-phase birds, particularly at higher thermal exposures. However, maximum temperature of the natural habitat became an important determinant of TEWL when birds were exposed to temperatures exceeding the TNZ. Species from hotter climates exhibited higher TEWL. Adaptation to arid climates did not restrict evaporative water loss at thermal conditions within the TNZ, but promoted evaporative water loss at exposures above the TNZ. The TEWL of granivores, which ingest food with low water content, differed little from species with other food habitats under all thermal conditions. The effects of environmental covariates of TEWL were dissimilar across thermal exposures, suggesting no evidence for a tradeoff between water conservation in the TNZ and heat dissipation at exposure to higher temperatures. Thus, birds may be able to acclimate when climate change results in the need to increase heat dissipation due to warming, except perhaps in hot, arid environments where species will need to depend heavily upon evaporative cooling to maintain homeothermy.
اظهر المزيد [+] اقل [-]Effect of water level on trophic dynamics in a flood plane lake | Efecto del nivel del agua sobre la dinámica trófica en un lago de inundación النص الكامل
2019
Tamara, Manuel | Sampedro, Alcides | Caraballo, Pedro
In order to define the trophic interactions in the Caimito swamp complex (municipality of Caimito, department of Sucre 84°7'42.29''N-75°06'48.59''O) and between this and the adjacent ecosystems, the biological communities present were studied. We used the information obtained in previous studies, one in high water period and one in low water period and a sampling of the authors, during the high water period. In each of them, the biotic richness of the body of water and the surrounding environment was studied, the biotic groups were: birds, aquatic macrophytes, aquatic macro invertebrates, fish, zooplankton and reptiles. A list was made of the species and taxonomic groups found, and trophic species were established, which served as the basis for the construction of the food web. The important role of detritus as a source of energy was evidenced in this ecosystem. Most representative groups were the omnivorous fish and the aquatic macro invertebrates, whose broad trophic spectrum and mechanisms for obtaining food make them vital groups in the use of matter and energy and transport to higher trophic levels. The food webs that represent the periods of drought and flood are functionally and structurally different. In period of drought, the community is dependent on detritus and primary producers participate during the flood. | Con el objetivo de definir las interacciones tróficas en el complejo cenagoso de Caimito (municipio de Caimito, departamento de Sucre 8°47'42,29''N- 75°06'48,59''O) y entre este y los ecosistemas adyacentes, se estudiaron las comunidades biológicas presentes. Se utilizó la información obtenida en estudios previos, uno en periodo de aguas altas y uno en periodo de aguas bajas y un muestreo de los autores, durante el período de aguas altas. En cada uno de ellos se estudió la riqueza biótica del cuerpo de agua y el ambiente aledaño, los grupos bióticos estudiados fueron: aves, macrófitas acuáticas, macroinvertebrados acuáticos, peces, zooplancton y reptiles. Se hizo un listado de las especies y grupos taxonómicos hallados y se establecieron trofoespecies, con las que se realizó una matriz binaria de datos, que sirvió de base para construir la red trófica. Se evidenció el papel importante de los detritos, como una fuente de energía en este tipo de ecosistemas. Los grupos más representativos fueron los peces omnívoros y el conjunto de macro invertebrados acuáticos, cuyo amplio espectro trófico y mecanismos de obtención del alimento, los convierte en grupos vitales en el aprovechamiento de materia y energía y transporte a los niveles tróficos superiores. Las redes tróficas que representan los períodos de sequía e inundación son funcional y estructuralmente diferentes. En el periodo de sequía, la comunidad es dependiente del detritus y en la inundación participan los productores primarios.
اظهر المزيد [+] اقل [-]Calidad de agua de la quebrada Mamarramos. Santuario de Flora y Fauna Iguaque, Colombia / Water quality of Mamarramos stream. The Sanctuary of Fauna and Flora Iguaque, Colombia النص الكامل
2019
Alexandra Cerón-Vivas | Yolanda Gamarra | Maryory Villamizar | Ricardo Restrepo | Reynaldo Arenas
El Santuario de Fauna y Flora de Iguaque (SFFI) es un área protegida por Parques Nacionales Naturales de Colombia (SPNN), perteneciente a la región andina colombiana, que abarca ecosistemas de páramo y bosque andino. El objetivo de este trabajo fue evaluar la calidad del agua de la quebrada Mamarramos, ubicada en el SFFI, y formada por la confluencia de las quebradas Francos y Carrizal, fuente de abastecimiento de las comunidades de la región. Se realizaron tres jornadas de muestreo, en estación seca, en diez puntos de monitoreo. Se calcularon índices biológicos a partir de las especies de macroinvertebrados colectados; índices fisicoquímicos, y el índice de calidad ecológica (ICE) basado en análisis multivariante, relacionando la abundancia de macroinvertebrados y las variables fisicoquímicas. Se colectaron 7 521 individuos, distribuidos en ocho clases, 16 órdenes y 57 familias. Leptoceridae (19%), Calamoceratidae (11.8%) y Psephenidae (10.8%) fueron las familias que presentaron mayor frecuencia. Los resultados confirmaron la buena calidad del agua de las quebradas, la cual no es afectada por los sistemas de tratamiento de aguas residuales in situ.
اظهر المزيد [+] اقل [-]