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We present a novel approximation algorithm for k-median that achieves an approximation guarantee of 1 + √3 + ε, improving upon the decade-old ratio of 3+ε. Our approach is based on two components, each of which, we believe, is of independent interest. Firs ...
The average unit exergy cost and CO2 emissions of the electricity generated in Brazil are evaluated using the national electricity mix and considering the representative profiles of the electricity generation routes. The Brazilian installed capacity is com ...
Transportation patterns in big cities are redefined by the growing trend of car ownership and usage costs (e.g. the initial cost of buying a car, the constantly growing fuel prices, additional maintenance and insurance costs and the increased parking deman ...
This thesis presents the development of a low-power analog-to-digital converter (ADC) which is intended to be used in WPAN receivers. WPAN devices are usually mobile and, therefore, operate on batteries. This puts a strict limitation on the power dissipati ...
Basic properties of plasma-deposited amorphous and microcrystalline layers are summarized. Limitations for solar cell performance, which are a result of these basic properties are pointed out. Efficiencies and other solar cell parameters obtained for the b ...
This study presents a methodology based on the process integration techniques and multiple representation of heating and cooling requirement concept to improve the energy efficiency of a large-scale chemical plant. Considering the difficulties of data gath ...
The availability of about 18 million hectares of grassland in Para State, Brazil, and the possibility of increasing the livestock density display a good perspective for the oil palm expansion in pasture land. A life cycle assessment is performed for a pros ...
Problems dealing with the design and the operations of gas transmission networks are challenging. The difficulty mainly arises from the simultaneous modeling of gas transmission laws and of the investment costs. The combination of the two yields a non-line ...
A tunable and self-regulating on-chip carbon nanotube based mass balance is presented for small-size and low-cost environmental and healthcare applications. Tube stretching and a phase-locked loop topology make the system widely universal and invariant to ...
The paper provides analytical evidence of the added-value of flexibility for air transportation systems. More specifically, the impact of a new innovative modular aircraft on the operations of an airline is deeply analyzed. The impact analysis is carried o ...