552 research outputs found
Daring to build fair and sustainable urban food systems: A case study of alternative food networks in Australia
No full textFood systems are under pressure from population growth, climate change, resource scarcity and increasing urbanization. Alternative food networks are initiatives related to food provision that operate at a local level and are concerned with both environmental stewardship and social justice. This paper presents a case study of alternative food networks operating in Brisbane and Melbourne in order to analyze: i) their socio-economic and environmental contributions to the resilience and sustainability of urban food systems; and, ii) the limitations that alternative food networks are facing. The cases researched include examples of urban agriculture, food hubs, buyers’ groups, and specialist retailers. The results indicate that alternative food networks can improve access to healthy food, provide fairer conditions for farmers, reduce food loss/waste, increase environmental protection, and facilitate climate change adaptation. The limitations to the expansion of alternative food networks are also discussed, including the restricted access to land for growing food, low public engagement, and the dependence on volunteer labor. The paper concludes by summarizing the contribution of alternative food networks to urban food systems and identifies issues for future research
A two-step optimisation method for the preliminary design of a hybrid electric vehicle
No full textIn the present investigation an innovative procedure to design a hybrid electric vehicle (HEV) is proposed, based on two steps: optimisation and decision-making. Both steps require a multi-objective approach due to the many goals to be taken into account in the design of a complex system like an HEV. The method has been applied to the preliminary design of the powertrain and tuning of the control strategy of a series hybrid vehicle, simulated with a Matlab-Simulink code. The hardware parameters included the number of axles in the vehicle, number of electric motors per axle, and type and quantity of energy storage system devices (batteries and/or electrochemical capacitors). The control parameters are related to fuel economy conversion factors and the maximum and minimum state of charge allowed to the secondary energy storage systems. Several attributes of performance and fuel consumption evaluated with respect to seven driving cycles were considered as optimisation goals. © 2008, Inderscience Publishers
Andamento dei profili audiometrici nel tempo in due gruppi di lavoratori del settore petrolchimico
No full textPower Electronics Building Block (PEBB) for Static Conversion Apparatus devoted to Low-Voltage Fed Electric Drives
No full textA Two-step Optimization Method for the Preliminary Design of a Hybrid Electric Vehicle
No full textIn the present investigation an innovative procedure to design a Hybrid Electric Vehicle (HEV) is proposed. The procedure is based on two steps: optimization and decision-making. Both steps re-quire a multi-objective approach due to the high number of goals to be taken into account in the de-sign of a complex system like a HEV.
The method has been applied to the preliminary design of the powertrain and the tuning of the con-trol strategy of a series hybrid vehicle, simulated with a Matlab-Simulink code. The hardware pa-rameters included the number of axles in the vehicle, the number of electric motors per axle, the type and quantity of energy storage system devices (batteries and/or electrochemical capacitors). The control parameters are related to the fuel economy conversion factors and the maximum and minimum state of charge allowed to the secondary energy storage systems.
Several attributes of performance and fuel consumption evaluated with respect to seven driving cy-cles were considered as optimization goals
post filter thromboembolic prophylaxis in vena cava filter carriers
No full textpost filter thromboembolic prophylaxis in vena cava filter carrier
Emission Testing for the EMC Performance Evaluationon Electrical Powered Wheelchair
No full textThis paper deals with emission testing of an electrically powered wheelchair with the purpose of a complete and accurate EMC (electromagnetic compatibility) performance evaluation of such a vehicle from different points of view. An extensive experimental test campaign has been carried out in a semi-anechoic chamber with two aims: to assess the influence and the interactions between the main subcomponents of the wheelchair PDS (power drive system) - such as power electronics, driving circuit and control circuit - and to compare emissions related to different typologies of PWM (pulse width modulation) modulation techniques, both deterministic and random, implemented in the inverters feeding the two twin AFPM (axial flux permanent magnet) wheel-motors the under test wheelchair is equipped with. Besides, an investigation of alternative test procedures has been accomplished to estimate the wheelchair EMC performance even during normal modes of operation (i. e. start-up, acceleration, turning, deceleration and braking)
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