José C. B. da Silva

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Paying for goods and services creates disutility for the payer. Based on ideas from behavioral economics, we contend that the disutility of paying can be substantially influenced by the method of payment. We develop a model of the consumer that takes into account phenomena such as the pain of paying, the sunk-cost effect, and self-control issues. In a(More)
A very important aspect of any interactive system is its ease of use. Advances in usability, online assistance, help (e.g. contextual help), interaction styles and design techniques (e.g. user-centered design) try to facilitate the use of these systems. However, users still face challenges in accomplishing tasks (e.g. they still have to learn the required(More)
The region of the Middle East around the Red Sea (between 32°E and 44°E longitude and 12°N and 28°N latitude) is a currently undocumented hotspot for atmospheric gravity waves (AGWs). Satellite imagery shows evidence that this region is prone to relatively high occurrence of AGWs compared to other areas in the world, and reveals the characteristics of these(More)
Economics has been for a longtime the social science of choice when it comes to informing policy and policymakers. In the current paper we contemplate what role can behavioral sciences play in enlightening policymakers. In particular we focus on the following three questions 1) What kind of behavioral science is important for policy? 2) What are some(More)
Advances in usability and design techniques (e.g. user-centered design) try to facilitate the use of interactive systems. However, users still have to adapt to interactive systems, i.e. they have to learn the steps required to accomplish a task either by trial and error or by obtaining help. While advanced users are usually able to adapt without much effort(More)
The successful launch of ENVISAT in March 2002 has given a great opportunity to understand the changes of water colour with high spatial resolution. In this study, the potential of MERIS sensor to describe variations of optically active substances of Alqueva artificial lake is investigated. Regular in situ measurements, from May 2004 to July 2005, are used(More)
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