An experimental life support system (ELSS) was constructed to study the interactive effects of multiple stressors on coastal and estuarine benthic communities, specifically perturbations driven by global climate change and anthropogenic environmental contamination. The ELSS allows researchers to control salinity, pH, temperature, ultraviolet radiation (UVR), tidal rhythms and exposure to selected contaminants. ...
Wythoff queens is a classical combinatorial game related to very interesting mathematical results. An amazing one is the fact that the P-positions are given by $(\lfloor \phi n, \phi^2 n \rfloor)$ and $(\lfloor \phi^2 n, \phi n \rfloor)$ where $\phi = \frac{1 + \sqrt{5}}{2}$. In this paper, we analyze a different version where one player (Left) plays with a chess bishop and the other (Right) plays with a chess ...
Concrete non-computable functions are usually related to the halting function. Is it possible to present examples of non-computability, which are unrelated to the halting problem and its derivatives? We built an abstract machine based on the historic concept of compass and ruler constructions (a compass construction would suffice) which reveals the existence of non-computable functions not related with the halt...
A microcamada superficial marinha (sea surface microlayer - SML) situa-se na interface entre a hidrosfera e a atmosfera. Esta camada é geralmente definida como o milímetro superior da coluna de água e representa um ambiente único com processos biológicos, químicos e físicos característicos. A SML está envolvida na regulação de processos ambientais e desempenha um importante papel no controlo das trocas de matér...
Esta tese defende o aprofundamento da investigação sobre as noções nucleares para os modelos de deliberação e controlo de agentes inteligentes: Primeiro, o poder individual, definido como o conjunto de aptidões do agente, no que diz res- peito à acção, a vontade, a que compete coordenar os empenhos deste e também o conhecimento sobre o ambiente, construído autonomamente pelo agente. A decisão, para...
OBJECTIVE: To investigate the role of tumor persistence in patients submitted to irradiation therapy and radical hysterectomy. DESIGN: A retrospective analysis of prognostic factors. LOCATION: Hospital A.C. Camargo, São Paulo, Brazil, a private non-profitmaking foundation and tertiary referral centre. PATIENTS: A total of 629 cases of invasive squamous cell carcinoma of the cervix were studied. Criteria for inc...
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