Reglas de los cinco ordenes de Arquitectura de Vignola : con vn orden Dórico de Posidonia, y vn apéndice que contiene las lecciones elementales de las sombras en la Arquitectura, demostradas por principios naturales / por C.M. Delagardette ... ; dibuxado

Sign.: []1, *2, A-K2, L1

Mineração oceânica: uma alternativa sustentável para o aproveitamento de areias quartzosas.

Este estudo apresenta ao Departamento de Engenharia de Minas e Petróleo (PMI) da Escola Politécnica da USP, e também a toda a sociedade, a importância que os oceanos têm com relação às suas riquezas minerais. Pretende ainda mostrar a grande responsabilidade que um empreendimento mineiro no fundo do mar precisa ter, com relação aos impactos ambientais, sendo possível minerar em regiões profundas no oceano promovendo a sustentabilidade. A ideia da mineração oceânica/submarina está ainda sendo amadurecida, este é o momento adequado para se propor metodologias de trabalho submarino sustentáveis; mitigar seus impactos. Este trabalho abrange o tema de maneira ampla, abordando o aspecto histórico, legal, ambiental, bem como questões técnicas de engenharia de minas, como sondagem submarina, caracterização tecnológica, lavra submarina, beneficiamento de minério oceânico e descarte de rejeitos. O trabalho apresenta os passos e resultados de um caso real de exploração oceânica. Trata-se de um estudo para viabilizar economicamente a extração e o beneficiamento de areia marinha, para fins industriais, proveniente da Baía de Guanabara (RJ). O trabalho apresenta desde o planejamento da amostragem no fundo do mar, execução destes trabalhos, caracterização tecnológica, simulação de processo e estudos específicos do uso industrial da areia após beneficiamento. Apresenta ainda uma proposta de rota de processo para a areia marinha e questões ligadas à lavra e ao descarte de rejeitos.

Evolution of Posidonia oceanica seagrass meadows and its implications for management

Results of the monitoring network of the Posidonia oceanica meadows in the Valencia region in Spain are analysed. For spatial comparison the whole data set has been analysed, however, for temporal trends we only selected stations that have been monitored at least 6 years in the period of 2002–2011 (26 stations in 13 localities). At the south of the studied area, meadows are larger, and they have higher density and covering than that in the Valencia Gulf, excluding Oropesa meadow. Monitoring of P. oceanica meadows in the Valencia region in Spain indicates that most of them are stationary or they are increasing their density and covering while no decline was observed in the studied meadows. These results indicate that there is not a general decline of P. oceanica meadows and that the decline of P. oceanica, when it has been observed in other studies, is produced by local causes that may be managed at the local level. This study also reflects the importance of long series of direct data to analyse trends in the population dynamics for slow-growing species.

Gasification and pyrolysis of Posidonia oceanica in the presence of dolomite

In the present work, a very detailed study of the reforming of syngas produced in the decomposition of Posidonia oceanica is done. The effect of the presence of different amounts of dolomite is analyzed. Also pyrolysis is studied, in nitrogen atmosphere, and gasification in the presence of air, oxygen and different amounts of steam. A detailed discussion on formation and destruction of tars is done. Furthermore, the effect of the heating rate in the decomposition and the residence time of the evolved gases are discussed. Syngas with ratio H2/CO from 0.3 to ca. 3 can be obtained from this interesting material. Marine species (microalgae) are usually studied with the aim of cultivating them for gas or oil production, but in this paper we draw attention to the possibility of using a natural resource with a very small impact in the ecosystem.

Gasification and Pyrolysis of Posidonia oceanica in the Presence of Dolomite

Resumen del póster presentado en Symposium on Renewable Energy and Products from Biomass and Waste, CIUDEN (Cubillos de Sil, León, Spain), 12-13 May 2015

Reglas de los cinco ordenes de arquitectura de Vignola : con un orden dorico de Posidonia, y un apendice que contiene las lecciones elementales de las sombras en la arquitectura, demonstradas por principios naturales /

Mode of access: Internet.

Reglas de los cinco ordenes de arquitectura de Vignola : con un dórico de Posidonia, y un apéndice que contiene las lecciones elementales de las sombras en la arquitectura, demonstradas por principios naturales /

Mode of access: Internet.

Effects of in situ CO2 enrichment on structural characteristics, photosynthesis, and growth of the Mediterranean seagrass Posidonia oceanica

Seagrass is expected to benefit from increased carbon availability under future ocean acidification. This hypothesis has been little tested by in situ manipulation. To test for ocean acidification effects on seagrass meadows under controlled CO2/pH conditions, we used a Free Ocean Carbon Dioxide Enrichment (FOCE) system which allows for the manipulation of pH as continuous offset from ambient. It was deployed in a Posidonia oceanica meadow at 11 m depth in the Northwestern Mediterranean Sea. It consisted of two benthic enclosures, an experimental and a control unit both 1.7 m**3, and an additional reference plot in the ambient environment (2 m**2) to account for structural artifacts. The meadow was monitored from April to November 2014. The pH of the experimental enclosure was lowered by 0.26 pH units for the second half of the 8-month study. The greatest magnitude of change in P. oceanica leaf biometrics, photosynthesis, and leaf growth accompanied seasonal changes recorded in the environment and values were similar between the two enclosures. Leaf thickness may change in response to lower pH but this requires further testing. Results are congruent with other short-term and natural studies that have investigated the response of P. oceanica over a wide range of pH. They suggest any benefit from ocean acidification, over the next century (at a pH of 7.7 on the total scale), on Posidonia physiology and growth may be minimal and difficult to detect without increased replication or longer experimental duration. The limited stimulation, which did not surpass any enclosure or seasonal effect, casts doubts on speculations that elevated CO2 would confer resistance to thermal stress and increase the buffering capacity of meadows.

Relaciones entre mareas y otros fenómenos geodinámicos: estudios en la Península Ibérica y California

En el ámbito de la investigación sobre Mareas, existen controversias que han dado lugar a extensos debates científicos y a la publicación de resultados contradictorios. Dos de estas discusiones, ampliamente conocidas, son la interpretación geofísica de los residuos finales de marea gravimétrica y la existencia o no de correlación entre las mareas y la ocurrencia de terremotos. El objetivo fundamental de esta tesis doctoral es realizar aportaciones a ambos aspectos de forma significativa y relevante. Si a las amplitudes y desfasajes de las componentes armónicas del potencial de mareas obtenidas a partir de datos de observación les restamos la parte correspondiente al modelo teórico de marea sólida y también la parte correspondiente al efecto oceánico, obtenemos un vector residuo final de marea cuya interpretación es un asunto muy debatido en Geodesia. Mientras que algunos autores sugieren que los residuos finales están relacionados con posibles errores instrumentales y de medida o con errores en la evaluación de los cálculos de la carga oceánica, otros proponen ciertas relaciones empíricas entre estos residuos finales de marea gravimétrica y parámetros que implican variaciones estructurales con respecto a un modelo de Tierra elástico homogéneo, como el flujo térmico o la edad tectonotérmica de la litosfera...