Abstract Soil Compaction results from compressive forces applied to compressible soil by machinery wheels, combined with tillage operations. Draft animal‐pulled equipment may also cause compaction, but a huge gap exists on experimental data adequately assess their impacts and, actually, animal traction is an option seen increasing potential contribute sustainable agriculture, especially in mountain areas. This study was conducted the compaction of operations motor tractor and draft animals....

Abstract Soil compaction is a serious problem, which aggravated due to its difficulty locate and reverse. Electrical resistivity tomography (ERT) non-invasive geophysical method that can be used identify compacted areas, soil horizon thickness assess physical properties. This study assesses the relationship between ERT compaction. Data were collected on 4-m transect in fallow plot located at Braganca (Portugal). Measurements performed before after tillage tractor passage. samples different...

Portugal’s EPAC silo network, initially planned in the 1930s but constructed and utilized primarily 1970s, consisted of 31 silos with a total capacity 841,100 t. The network’s usage declined, however, due to market liberalization accession European Economic Community 1985. This study focuses on adapting methodology inventory analyse network considering their general features, construction, technological facilities, socioeconomic aspects. are situated 30 cities towns, predominantly country’s...

The article proposes an algebraic synthesis for PWM methods, which is based on a graphical representation of the 2 levels VSI (Voltage Source Inverter). This theory can be starting point every method representation.In order to understand historical evolution methods authors propose two classification groups main techniques. movement neutral (zero-voltage VN0 evolution). details presented here are also seen from perspective.The equivalence between well-known SVM (Space Vector Modulation)...

In the Tras-os-Montes Region (Northeastern Portugal), olive tree plantations cover an area of more than 70 thousand ha (near 6 % regional territory), mostly planted and cultivated under traditional non-mechanised cultural systems. It is fully recognised that sector contributes significantly to agroeconomy, as well conservation certain typical landscapes. The purposes this study were (i) draw a general picture olive-tree spatial distribution in (ii) identify main soil characteristics land...

In the last one hundred years, tractors with much more power replaced animals all over world, except in developing countries.Besides advantage power, use of increases agriculture productivity and time efficiency field operations.Despite unquestionable for performance, recent years interest by animal traction is growing, even developed countries.It important to understand why.This usually linked small scale farming, but not only.Environmental concern most significant reasons, different...

Harvest efficiency is defined as the percentage of fruits harvested by total production.The less than 100% when working with trunk shakers to detach olives.It important increase in order farmer's income.This objective can be achieved knowing evolution main factors affecting fruit detachment.Fruit removal force (FRF), weight (P) and ratio between them are for harvest efficiency.Field trials took place two years (2013-2014) Vilariça Valley, northeast Portugal an olive orchard 'Cobrançosa...

When and how harvest olives are among the most important issues to improve quality quantity ensure best net return growers. Trunk shakers commonly used in mechanical harvesting detach olives. Field trials showed that with this equipment less than 100% of production is detached, usually 70% 90% (Michelakis, 2002). It increase percentage fruits harvested, reduce losses. To achieve goal factors affecting olive must be known, definition season. Some these result orchard management, like tree...

Trunk and bough shakers are common equipment for olive harvesting, therefore information about their performance is becoming available. For less like canopy shakers, there a lack of relative to field work capacity. The Oli-picker harvester commercially available, operates brushing the tree with spiked cylindrical comb mounted on hydraulic articulated arm, making possible operation, inside or around crown. This paper presents results from three years observation in Tras-os-Montes (northeast...

In Portugal, the olive orchard is most representative agricultural crop and one of impactful on national economy. Therefore, a production structure accompanying technological advances in this field would be expected; however, such has not yet been realized, especially within traditional systems. Thus, taking northeastern Portugal as case study, where great expression orchards visible, following aspects are addressed paper: region’s biophysical framework, orchard’s environmental...

In the article there is presented design of a safety clutch for screw conveyor with time-separated modes slipping and axial displacement automatic restoration operating condition in event overload. A calculation has been made using contact stresses engagement elements device, level which determining indicator that affects wear rate surfaces. Using SolidWorks Premium software diagrams distribution during operation were constructed, by results it was established analytical dependencies,...

The development of small-scale power generation units based on biomass gasification is an effective mean to meet the growth interest deployment local exploiting endogenous renewable energy sources. However, significant research and activities are required towards cost-effective solutions suitable be used in several applications with different feedstock. For this purpose, a flexible experimental setup developed. This paper proposes critical review current state art available technologies for...

Nowadays, the climate is undoubtedly one of main threats to sustainability olive orchards, especially in case rainfed traditional production systems. Local warming, droughts, and extreme weather events are some climatological factors responsible for environmental thresholds relation crops being exceeded. The objective this study was investigate influence microclimatic variability on productivity orchards a municipality located northeastern Portugal. For purpose, official data climate,...

Portugal’s EPAC (Empresa Pública do Abastecimiento dos Cereais) silo network, initially planned in the 1930s but constructed and utilised primarily 1970s, consisted of 31 silos with a total capacity 841,100 t. The network’s usage declined, however, due to market liberalisation accession European Economic Community 1985. This study focuses on adapting methodology inventory analyse considering their general features, construction, technological facilities, socioeconomic aspects. are situated...

Este trabalho descreve uma experiência de atividades voltadas para o estímulo e desenvolvimento habilidades coordenação motora, cognitivas sociais, individuais ou em grupos, tendo como objetivo estimular convívio social das idosas residentes instituição longa permanência com vistas a melhorar qualidade vida, partir oficinas interativas. As desenvolvidas as na Instituição Longa Permanência Para Idosos fundamentaram acolhida, forma humanização do cuidado saúde, foram realizadas adotando...

O presente artigo aborda o uso de estacas Mega como uma solução eficaz para reforço fundações em obras civis. Com crescimento urbano e a demanda por estruturas mais robustas, é essencial explorar alternativas que garantam estabilidafde segurança das edificações. Este estudo tem ideal mostrar as apresentam alta capacidade carga versatilidade aplicação estrutural fundações. Para embasar estudo, primeiramente foi feito revisão bibliográfica abrangente sobre profundas método instalação...