Tomaz Dentinho
Universidade dos Açores, Departamento de Ciências Agrárias, Faculty Member
Research Interests:
O sistema de abastecimento de água da cidade do Huambo está bastante degradado em virtude da guerra civil que vitimou Angola durante trinta anos. O objectivo do artigo é determinar a vontade de pagar dos habitantes do Huambo para... more
O sistema de abastecimento de água da cidade do Huambo está bastante degradado em virtude da guerra civil que vitimou Angola durante trinta anos. O objectivo do artigo é determinar a vontade de pagar dos habitantes do Huambo para avaliação a capacidade económica de melhora o sistema de abastecimento de água da cidade. Para isso adoptou-se o método de avaliação contingente e entrevistaram-se trezentas famílias dos diferentes bairros da cidade do Huambo. Seguidamente determinou-se a curva da procura de abastecimento de água da população do Huambo e estimou-se a receita e número de excluídos para diferentes níveis de política preços. Abstract Abstract Abstract Abstract Abstract The water supply system of the City of Huambo is severely degraded due to thirty years of civil war in Angola. The objective of this article is to estimate the willingness to pay of the Huambo residents for the improvement of the water supply system of the city. To achieve that it is used the contingent valuatio...
2 SUHVHQWH DUWLJR SUHWHQGH DYDOLDU D LQflXrQFLD GRV aeroportos no desenvolvimento das diferentes ilhas dos Açores. Para isso assume-se que a evolução da população é uma boa variável proxi para estimar a evolução económica das ilhas e... more
2 SUHVHQWH DUWLJR SUHWHQGH DYDOLDU D LQflXrQFLD GRV aeroportos no desenvolvimento das diferentes ilhas dos Açores. Para isso assume-se que a evolução da população é uma boa variável proxi para estimar a evolução económica das ilhas e testam-se várias variáveis ...
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Nos Açores a produção de beterraba sacarina com fim industrial é exclusiva da ilha de S. Miguel onde, ao longo do último século, tem ocupado áreas com altitude até 300 metros e declives inferiores a 7%. A área variou entre 3000 hectares... more
Nos Açores a produção de beterraba sacarina com fim industrial é exclusiva da ilha de S. Miguel onde, ao longo do último século, tem ocupado áreas com altitude até 300 metros e declives inferiores a 7%. A área variou entre 3000 hectares na década de sessenta e 200 ...
The value of recreational snorkelling in defined underwater routes was evaluated for Marinha Beach, Algarve. The travel cost technique was used for defining the value of recreational use and the benefits of this natural resource. A total... more
The value of recreational snorkelling in defined underwater routes was evaluated for Marinha Beach, Algarve. The travel cost technique was used for defining the value of recreational use and the benefits of this natural resource. A total of 115 questionnaires were analysed, based on surveys carried out from the 15 of July to 15 of September 2008. Regression analysis used considered the number of dives as the independent variable, while dependent variables referred to different costs incurred during the trip and time spent on the activity weighted by a fraction of the declared income. The estimated average surplus per dive was 5€ and the value of the three routes was of 600€/year, corresponding to a total of 30000€, considering a discount rate of 2% and the maintenance of the resource for several years. Assuming a carrying capacity of 1000 dives per year, the total resource rent per year was estimated at 5000€, corresponding to a total economic value for the use of these underwater r...
The value of recreational snorkelling in defined underwater routes was evaluated for Marinha Beach, Algarve. The travel cost technique was used for defining the value of recreational use and the benefits of this natural resource. A total... more
The value of recreational snorkelling in defined underwater routes was evaluated for Marinha Beach, Algarve. The travel cost technique was used for defining the value of recreational use and the benefits of this natural resource. A total of 115 questionnaires were analysed, based on surveys carried out from the 15 of July to 15 of September 2008. Regression analysis used considered the number of dives as the independent variable, while dependent variables referred to different costs incurred during the trip and time spent on the activity weighted by a fraction of the declared income. The estimated average surplus per dive was 5€ and the value of the three routes was of 600€/year, corresponding to a total of 30000€, considering a discount rate of 2% and the maintenance of the resource for several years. Assuming a carrying capacity of 1000 dives per year, the total resource rent per year was estimated at 5000€, corresponding to a total economic value for the use of these underwater r...
The paper starts with the introduction of a simple analytical tool that classifies regions according to their scale and accessibility. Those indicators are closely related to the strategies of European expansion and European integration... more
The paper starts with the introduction of a simple analytical tool that classifies regions according to their scale and accessibility. Those indicators are closely related to the strategies of European expansion and European integration and at the same time translate paradigmatic outcomes of those combined strategies; they are usually labelled as fortress Europe, different speeds Europe, coloniser Europe and, adding
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The aim of this paper is to analyze the impacts of electric mobility in the transportation patterns using a spatial interaction model, with alternative transportation modes and implicit accessibility networks. Beyond the introduction, the... more
The aim of this paper is to analyze the impacts of electric mobility in the transportation patterns using a spatial interaction model, with alternative transportation modes and implicit accessibility networks. Beyond the introduction, the paper is divided into three parts: a) In the first part we design the spatial interaction model for the islands with alternative modes of transportation and implicit accessibility networks; b) In the second part we estimate the prospective demand for electric mobility based on data from a choice experiment; c) in the third part we try to understand the impacts of the attributes of electric mobility in the transportation patterns of the Azores.
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Huambo province in Angola has been detached from the outside world since the begining of the nineties. First due to the civil war in Angola and from then on due to the degradation of the roads and destruction of the railways. Furthermore... more
Huambo province in Angola has been detached from the outside world since the begining of the nineties. First due to the civil war in Angola and from then on due to the degradation of the roads and destruction of the railways. Furthermore there is the lack of integration of the province itself due to transport difficulties and human desertification. The
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Climate change becomes an increasing constraint in IWRM and many effects are expected in coastal watersheds like sea level rise and its consequences (i.e. beach erosion, salt water intrusion, soil salinization, groundwater and surface... more
Climate change becomes an increasing constraint in IWRM and many effects are expected in coastal watersheds like sea level rise and its consequences (i.e. beach erosion, salt water intrusion, soil salinization, groundwater and surface water pollution...) or water budget changes (i.e. seasonal and inter-annual fluctuations) and an increase of extreme events (i.e. floods, rainfalls and droughts). Beside this physical changes
Research Interests: Remote Sensing, Climate Change, Decision Making, Water Availability, Coastal Dunes, and 27 moreSoil Salinity, Water Management, Seasonality, Water Demand, Sea level rise, Spatial Competition, Case Study, Land Use, Surface Water, Data Collection, Groundwater Quality, Population Growth, Coastal Aquifer, Spatial Distribution, Water Use, Beach erosion, Object oriented classification, Spatial Data, Economic Model, Labor Productivity, Economic Modelling, Decision Maker, Water Masses, Integrated Water Resource Management, Water budget, Urban Area, and Coastal Area
ABSTRACT This paper tries to understand urban unsustainability. The main argument is that the story of unsustainable cities is characterized by a ‘tragedy of the commons’ phenomenon not only in the deployment of urban infrastructure but... more
ABSTRACT This paper tries to understand urban unsustainability. The main argument is that the story of unsustainable cities is characterized by a ‘tragedy of the commons’ phenomenon not only in the deployment of urban infrastructure but also in the overuse of the natural capital that sustain the city. We show that, looking at the story of unsustainable cities from the perspective of a simple general equilibrium urban model, open access to urban land leads to high concentrations of population, huge deployment of urban infrastructure and irreversible degradation of the natural capital creating a ‘tragedy of urban infrastructure’ that undermines the sustainability of cities creating preannounced urban ruins.Resumen. Este artículo intenta entender la insostenibilidad urbana. El argumento principal es que la historia de las ciudades insostenibles está caracterizada por el fenómeno de la “tragedia de los comunes” no solo en el despliegue de infraestructura urbana sino también en la sobreexplotación del capital natural que sostiene la ciudad. Mostramos que, observando la historia de ciudades insostenibles desde la perspectiva de un modelo urbano de equilibrio general simple, el acceso libre al suelo urbano causa concentraciones de población elevadas, un despliegue masivo de infraestructura urbana y una degradación irreversible del capital natural, que crean una ‘tragedia de la infraestructura urbana’ que socava la sostenibilidad de las ciudades con el preaviso de la aparición de ruinas urbanas.
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Accross river basins water can have different types of values according not only to its production costs but also due to changes in the willingness to pay across the territory. The generalized view that integrated water management must be... more
Accross river basins water can have different types of values according not only to its production costs but also due to changes in the willingness to pay across the territory. The generalized view that integrated water management must be made through a centralised mechanism does not consider those facts and often assumes that command and control policies are the only
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Huambo has central capacities able to compete and complement other major towns in Africa such as Johannesburg and Nairobi. Nevertheless, Huambo, the second city of Angola, was at war from 1975 till 2002 and continued to be relatively... more
Huambo has central capacities able to compete and complement other major towns in Africa such as Johannesburg and Nairobi. Nevertheless, Huambo, the second city of Angola, was at war from 1975 till 2002 and continued to be relatively isolated from 2002 till 2006, because it took some time to rebuilt former roads. Furthermore the destruction of the export based activities
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Islands are attractive places for tourists and most islands can be, sooner or later, requested by an increasing touristic demand. But islands are also places where natural capital has very defined limits. The aim of this paper is to... more
Islands are attractive places for tourists and most islands can be, sooner or later, requested by an increasing touristic demand. But islands are also places where natural capital has very defined limits. The aim of this paper is to assess the carrying capacity of islands in terms of water in relation to the touristic demand. We use an Input-Output Table
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The usual conceptualisation of farmer production system involves three interrelated production systems: a feed production function which inputs are fertiliser, land, weather machinery and labour; a cattle production function based cows,... more
The usual conceptualisation of farmer production system involves three interrelated production systems: a feed production function which inputs are fertiliser, land, weather machinery and labour; a cattle production function based cows, feed - bought or produced - machinery and labour and a conversion production system that generates milk and beef. The aim of this paper is to conceptualise the spatial
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Islands are one of the most important destinations for tourism and leisure. However, islands exhibit different levels of attractiveness in the course of time and comparing with other islands. The objective of this paper is to analyze this... more
Islands are one of the most important destinations for tourism and leisure. However, islands exhibit different levels of attractiveness in the course of time and comparing with other islands. The objective of this paper is to analyze this subject for the Archipelago of the Azores, using gravity models and the travel cost method. The study aims to understand different performances
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Research Interests:
São Tomé e Príncipe is a small insular country located in the Gulf of Guinea, populated by 160000 persons, living in 1000 square kilometers of a rainforest environment. The GDP pc is 1200 US$ per year, 50% of the economy is... more
São Tomé e Príncipe is a small insular country located in the Gulf of Guinea, populated by 160000 persons, living in 1000 square kilometers of a rainforest environment. The GDP pc is 1200 US$ per year, 50% of the economy is based in auto-consumption and the main engine of the remaining economic system is the external public debt, rents
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Science is driven by research funds, research funds are associated with decision making, and decision making is attached to valuation. Therefore every scientific paradigm tend to devise its own valuation system. Ecconomists prefer cost... more
Science is driven by research funds, research funds are associated with decision making, and decision making is attached to valuation. Therefore every scientific paradigm tend to devise its own valuation system. Ecconomists prefer cost benefit analysis where everything can be translated into money. Planners assume values to infinity which lines in a map difining restrictions and enforceable land uses. Ecologists
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Pollution, increase of water demand, and Global Climatic Changes are the main threats that affect water resources and that make crucial the development of effective planning and management strategies of water resources. Agriculture is one... more
Pollution, increase of water demand, and Global Climatic Changes are the main threats that affect water resources and that make crucial the development of effective planning and management strategies of water resources. Agriculture is one of the most important human activity with a major impact on water resources as it requires huge amounts of water and fertilizers. In the Azores
Research Interests: Water quality, Decision support system, global Climate change, Water Demand, Case Study, and 11 moreGroundwater Quality, Integrated Water Management, Ecological Model, Decision Problem, Human Activity, Water Resource, Water Quality, Management Strategy, Dynamic Modelling, Decision Models, and Dairy Farm
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Research Interests:
Research Interests:
In the Azores, dairy farming is the dominant activity of the primary sector, being forestry the remaining activity mainly dominated by Cryptomeria japonica and Eucalyptus globulus. These two species are those that present greater economic... more
In the Azores, dairy farming is the dominant activity of the primary sector, being forestry the remaining activity mainly dominated by Cryptomeria japonica and Eucalyptus globulus. These two species are those that present greater economic interest, being Cryptomeria the most exploited in the Region. The aim of this paper is to analyze the competitiveness of the forest activity regarding dairy