Search results for "gas [meson]"
showing 10 items of 409 documents
Possible role of mannitol as an oxygen radical scavenger in olive
2011
Along with mannose and sucrose, olive produces large amounts of mannitol in photosynthesizing leaves. Leaf mannitol shows large variation among olive genotypes and Sicilian cultivars with different leaf mannitol content were used in our trials to see whether mannitol may function as an additional non-enzymatic system to protect cells from oxygen radicals and photosystem damage. In one experiment, entire shoots of 'Passulunara', 'Castriciana', 'Nocellara del Belice', and 'Moresca' olive trees were taken to a greenhouse, and mature leaves were treated with paraquat solution, which generates oxygen radicals in presence of light. After 48 hours leaves were sampled, photographed and percent of n…
SOIL FERTILITY, GREENHOUSE GAS EMISSIONS AND AGRONOMIC PERFORMANCE IN A VINEYARD WITH DIFFERENT SOIL MANAGEMENT IN A SEMIARID MEDITERRANEAN ENVIRONME…
2017
In the semiarid Mediterranean environment, vineyard soils are often characterised by intensive tillage and large supply of inorganic fertilizers. Those practices, coupled with the semiarid Mediterranean climate features (warm to hot, dry summers and mild, wet winters),speed up the mineralisation of soil organic matter (SOM) so that many lands have lost much fertility. To counteract SOM decline, the introduction of cover crops with or without nitrogen (N) fixing forage legumes, has become a management technique widely used. Indeed, cover crops besides increasing SOM and potentially mineralisable N, it can mitigate soil erosion in sloping vineyards. However, the competition risk for soil wate…
Sensitivity and uncertainty analysis of a plant-wide model for carbon and energy footprint of wastewater treatment plants
2014
This paper presents the sensitivity and uncertainty analysis of a mathematical model for Greenhouse gas (GHG) and energy consumption assessment from wastewater treatment plants (WWTPs). The model is able to simultaneously describe the main biological and physical-chemical processes in a WWTP. Specifically, the mathematical model includes the main processes of the water and sludge lines influencing the methane (CH4), nitrous oxide (N2O), and carbon dioxide (CO2) emissions. Further, the process energy demand and the energy recovery are also taken into account. The main objective of this paper is to analyze the key factors and sources of uncertainty influencing GHG emissions from WWTP at a pla…
Sustainable development in urban transport: Feasibility study for a plant to produce and store hydrogen from wind energy in the urban transport in We…
2005
The emission saving related to the use of renewable energy sources: The case study of solar thermal collectors
2003
The employment of renewable energy sources can represent a useful way to reduce air emissions released by conventional ones. In this paper we describe the results of a Life Cycle Analysis performed upon one of the most world-wide diffused renewable technologies: the solar thermal collectors for warm sanitary water. Two domestic solar plants have been investigated: mono-familiar plant with a passive flat collector and a large solar plant with forced fluid circulation. The first step has been the evaluation of direct and indirect emissions related to the production and use of plants. The main emissions have been categorised in three of the most important indicators (Global Warming Potential, …
ECO-PROFILES OF INNOVATIVE ENERGY SYSTEMS FOR DOMESTIC AND RESIDENTIAL APPLICATIONS
2015
The exponential growth of distributed generation systems (mainly from solar energy through the use of photovoltaic) and the new release on energy markets of new generation technologies, with smaller dimension, are pushing towards rethinking energy systems. "Smart buildings" with the capacity to produce, store and manage flow of information's and energy will become the milestone of the future distribution networks (smart buildings to smart grid). The goal of this study is to evaluate the ecoprofile of 1 kWh of electricity, selected as a functional unit, generated by microcogenerator fuel cells as SOFC. The analysis was performed using the Life Cycle Assessment methodology, which allows to co…
Intrapulmonary 3He Gas Distribution Depending on Bolus Size and Temporal Bolus Placement
2008
OBJECTIVE: Dynamic ventilation (3)He-MRI is a new method to assess pulmonary gas inflow. As differing airway diameters throughout the ventilatory cycle can influence gas inflow this study intends to investigate the influence of volume and timing of a He gas bolus with respect to the beginning of the tidal volume on inspiratory gas distribution. MATERIALS AND METHODS: An ultrafast 2-dimensional spoiled gradient echo sequence (temporal resolution 100 milliseconds) was used for dynamic ventilation (3)He-MRI of 11 anesthetized and mechanically ventilated pigs. The applied (3)He gas bolus was varied in volume between 100 and 200 mL. A 150-mL bolus was varied in its application time after the beg…
Sociālās palīdzības organizatora profesionālā identitāte un profesionālā loma sociālajā darbā Rīgas sociālajā dienestā
2016
Maģistra darba „Sociālās palīdzības organizatora profesionālā identitāte un profesionālā loma sociālajā darbā Rīgas sociālajā dienestā” mērķis ir izpētīt sociālās palīdzības organizatora profesionālo identitāti, profesionālo lomu, sadarbību starp sociālās palīdzības organizatoru un sociālo darbinieku klientu problēmu risināšanā, kā arī noskaidrot, kā sociālās palīdzības organizatora darba nepieciešamību Rīgas sociālajā dienestā redz sociālās palīdzības organizatori un sociālie darbinieki. Teorētiskajā daļā aplūkota profesionālās identitātes un organizatoriskās identificēšanas teorija, sociālās palīdzības organizatora un sociālā darbinieka darbība Rīgas sociālajā dienestā, kā arī Rīgas sociā…
Senioru vientulības problēma ilgstošās sociālās aprūpes institūcijā
2020
Maģistra darba “Senioru vientulības problēma ilgstošās sociālās aprūpes institūcijā” mērķis ir analizēt senioru vientulību kā sociālo problēmu Rīgas pašvaldības ilgstošās sociālās aprūpes institūcijās. Pētījuma teorētisko daļu veido sociālo problēmu apraksts, vientulības analīze, pārsvarā jau iepriekš veikti pētījumi par vientulību senioru vidū, kā arī senioru vecuma īpatnību skaidrojums. Tika analizētas arī tās teorijas, kuras, pēc autores domām, ļauj pamatot sociālā darba iespējas senioru vientulības problēmas analīzē un risinājumā: sistēmiskā teorija un psihodinamiskā teorija. Empīriskajā izpētē tika izmantotas kvantitatīvā pētniecības metode – vientulības skala ‒ un kvalitatīvā pētniecī…
BIOCHARS IN SOILS: TOWARDS THE REQUIRED LEVEL OF SCIENTIFIC UNDERSTANDING
2017
The special issue on Biochar as an Option for Sustainable Resource Management Key priorities in biochar research for future guidance of sustainable policy development have been identified by expert assessment within the COST Action TD1107. The current level of scientific understanding (LOSU) regarding the consequences of biochar application to soil were explored. Five broad thematic areas of biochar research were addressed: soil biodiversity and ecotoxicology, soil organic matter and greenhouse gas (GHG) emissions, soil physical properties, nutrient cycles and crop production, and soil remediation. The highest future research priorities regarding biochar’s effects in soils were: functional …