Studies of the Mobilization of Thoriun from the Norro Do Ferro

1981 ◽  
Vol 11 ◽  
Author(s):  
H. Eiseneud ◽  
W. Lei ◽  
R. Ballad ◽  
E. Penna Franca ◽  
N. Niekeley ◽  
...  

The Morro do Ferro1,2,3 is a hill on the Pocos de Caldas plateau in the state of of Minas Gerais, Brazil which, except for a few monazite beaches, may have the highest levels of natural radioactivity of any place on the surface of the earth (1–3 mK/hr). The radioactivity originates from an ore body located on the upper slopes of the hill (Fig. 1), which rises about 140 m above its surroundings to a maximum altitude of 1540 m. The ore body is estimated to contain about 20,000 metric tons of Th and a somewhat greater quantity of rare earths. The Morro do Ferro has been the site of a number of radiobiological studies conducted during the past 20 years.4,5,6,7

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
E. Anagnostou ◽  
E. H. John ◽  
T. L. Babila ◽  
P. F. Sexton ◽  
A. Ridgwell ◽  
...  

Abstract Despite recent advances, the link between the evolution of atmospheric CO2 and climate during the Eocene greenhouse remains uncertain. In particular, modelling studies suggest that in order to achieve the global warmth that characterised the early Eocene, warmer climates must be more sensitive to CO2 forcing than colder climates. Here, we test this assertion in the geological record by combining a new high-resolution boron isotope-based CO2 record with novel estimates of Global Mean Temperature. We find that Equilibrium Climate Sensitivity (ECS) was indeed higher during the warmest intervals of the Eocene, agreeing well with recent model simulations, and declined through the Eocene as global climate cooled. These observations indicate that the canonical IPCC range of ECS (1.5 to 4.5 °C per doubling) is unlikely to be appropriate for high-CO2 warm climates of the past, and the state dependency of ECS may play an increasingly important role in determining the state of future climate as the Earth continues to warm.


2019 ◽  
Vol 23 (2) ◽  
pp. 863
Author(s):  
Flávia de Paula Duque Brasil ◽  
Ricardo Carneiro ◽  
Fernando Resende Anelli ◽  
Luísa de Paulo Longuinho

Os Fóruns Regionais de Governo de Minas Gerais foram criados em 2015 com a intenção de viabilizar um canal para as demandas provenientes da população das diferentes regiões do estado. A nova instância participativa se desenvolveu nos últimos quatro anos, sob o slogan do governo de Minas Gerais (2015-2018) de “ouvir para governar”. O presente trabalho teve como objetivo analisar características centrais do desenho institucional e do processo participativo, a partir das reflexões teóricas de Fung e Wright (2003) sobre a Empowered Participatory Governance e de Tarragó, Brugué e Cardoso Jr. (2015), a respeito da construção de uma Administração Pública Deliberativa. Na análise, foram identificados potencialidades e desafios na implementação dos Fóruns Regionais de Governo (2015-2018) e levantadas reflexões sobre sua consolidação como inovação democrática no modelo mineiro de gestão.  Palavras-chave: Participação social. Administração pública deliberativa. Desenho institucional participativo. Inovação democrática. Fóruns Regionais.PARTICIPATION AND DELIBERATION IN PUBLIC MANAGEMENT: challenges and potentialities of the Regional Government ForumsAbstractThe Minas Gerais Regional Government Forums were created to provide a channel for the demands of the population of the different regions of the state. The new participatory instance has developed, over the past four years, under the slogan of the Minas Gerais government (2015-2018) of "listening to govern". The objective of this study was to analyze the central characteristics of the institutional design and the participatory process, based on the theoretical reflections of Fung and Wright (2003) on Empowered Participatory Governance and Tarragó, Brugué and Cardoso Jr. (2015) on the construction ofa Deliberative Public Administration. In the analysis, were identified potentialities and challenges in the implementation of the Regional Government Forums and raise reflections on its consolidation as a democratic innovation in the Minas Gerais management model.Keywords: Social participation. Deliberative public administration. Participatory institutional design. Democratic innovation. Regional Forums.


1919 ◽  
Vol 6 (2) ◽  
pp. 57-59 ◽  
Author(s):  
R. M. Deeley

Sir Charles Lyell in his Principles of Geology, published in 1834, remarks upon the accumulating proofs that the climate of the earth had undergone great changes in the past, and he endeavoured to show that these changes might have been produced by the varying distribution of sea and land. He says, “But if, instead of vague conjectures as to what might have been the state of the planet at the era of its creation, we fix our thoughts steadily on the connexion at present between climate and the distribution of land and sea; and if we then consider what influence former fluctuations in the physical geography of the earth must have had on superficial temperature, we may perhaps approximate to a true theory.”


1888 ◽  
Vol 9 ◽  
pp. 264-271
Author(s):  
D. G. Hogarth ◽  
M. R. James

Tombs of all periods were opened during the past season, a few archaic ones at Leontari Vouno, which have been described by Mr. James in his account of that site, and others at Kuklia of all subsequent ages, down to the very latest. They are usually cut in the rock or earth of a gentle slope, in many cases, as in the Xylino valley at Kuklia, tier above tier: but they are also found in level ground, approached by a sloping passage now filled with earth. The whole plateau to the east of Kuklia above the is honey-combed with earth-tombs of this kind, consisting mainly of one or two vaulted chambers, leading one out of the other, without niches for the bodies, and entered by a vaulted opening closed by a slab. Such are probably tombs of the poor: the richer Cypriotes were for the most part laid in rock-tombs, such as abound in the plain north of New Paphos, and were found by us at Old Paphos on the slopes between the Temple of Aphrodite and the sea. From their greater durability and accessibility the latter were often used two or three times over, being sometimes sanctified at last for Christian burial by innumerable crosses, cut over the niches, as is the case at Cape Drepano: thus they are usually less profitable to the explorer of to-day than the earth-chambers, which were left undisturbed in the possession of their original tenants, and were not so easily detected by the τυμβωρύχος of the early centuries of our era. Of the work of the latter we found ample evidence at Kuklia: tomb after tomb was opened on the eastern slopes, in which broken glass and pottery were lying in a huge heap either in the middle or near the door, what the thieves did not want having apparently been wantonly destroyed: the lids of the sarcophagi were either hewn in pieces or wrenched aside, and even, in some cases, in order probably to evade notice, carefully replaced in statu quo. The door was by no means the favourite place of ingress, for we often dug down to find the slab quite undisturbed, while the tomb was in the state described above, and search would reveal the presence of a hole or passage cut through the solid rock from above or at the side.


2009 ◽  
Vol 62 (3) ◽  
pp. 271-276 ◽  
Author(s):  
Renata Salles Kurusu ◽  
Arthur Pinto Chaves ◽  
Christian Fonseca de Andrade ◽  
Claret Antônio Vidal Abreu

Companhia Brasileira de Alumínio (CBA) has bauxite processing plants at Poços de Caldas and Itamarati de Minas, and a new processing plant at Miraí that has been operating since June, 2008; all of them are in the State of Minas Gerais. The plants haveunits for the crushing, scrubbing and screening operations. The screened oversize is the concentrate or washed bauxite. At Itamarati de Minas, the fines are de-slimed and concentrated by gravity separation of the iron-titanium minerals in Reichert spirals followed by HIWMS. The tailings still contain bauxite, which can be separated by reverse froth flotation (flotation of the quartz and depression of the bauxite), using starch as a depressant and amine as a promoter; the pH must be around 10.0. The iron and titanium bearing minerals are depressed with the bauxite and an additional magnetic separation operation is necessary on the depressed bauxite. This paper describes the work performed on Itamarati de Minas samples on a bench scale at Escola Politécnica, University of S. Paulo.


1962 ◽  
Vol 14 ◽  
pp. 133-148 ◽  
Author(s):  
Harold C. Urey

During the last 10 years, the writer has presented evidence indicating that the Moon was captured by the Earth and that the large collisions with its surface occurred within a surprisingly short period of time. These observations have been a continuous preoccupation during the past years and some explanation that seemed physically possible and reasonably probable has been sought.


Author(s):  
VICTOR BURLACHUK

At the end of the twentieth century, questions of a secondary nature suddenly became topical: what do we remember and who owns the memory? Memory as one of the mental characteristics of an individual’s activity is complemented by the concept of collective memory, which requires a different method of analysis than the activity of a separate individual. In the 1970s, a situation arose that gave rise to the so-called "historical politics" or "memory politics." If philosophical studies of memory problems of the 30’s and 40’s of the twentieth century were focused mainly on the peculiarities of perception of the past in the individual and collective consciousness and did not go beyond scientific discussions, then half a century later the situation has changed dramatically. The problem of memory has found its political sound: historians and sociologists, politicians and representatives of the media have entered the discourse on memory. Modern society, including all social, ethnic and family groups, has undergone a profound change in the traditional attitude towards the past, which has been associated with changes in the structure of government. In connection with the discrediting of the Soviet Union, the rapid decline of the Communist Party and its ideology, there was a collapse of Marxism, which provided for a certain model of time and history. The end of the revolutionary idea, a powerful vector that indicated the direction of historical time into the future, inevitably led to a rapid change in perception of the past. Three models of the future, which, according to Pierre Nora, defined the face of the past (the future as a restoration of the past, the future as progress and the future as a revolution) that existed until recently, have now lost their relevance. Today, absolute uncertainty hangs over the future. The inability to predict the future poses certain challenges to the present. The end of any teleology of history imposes on the present a debt of memory. Features of the life of memory, the specifics of its state and functioning directly affect the state of identity, both personal and collective. Distortion of memory, its incorrect work, and its ideological manipulation can give rise to an identity crisis. The memorial phenomenon is a certain political resource in a situation of severe socio-political breaks and changes. In the conditions of the economic crisis and in the absence of a real and clear program for future development, the state often seeks to turn memory into the main element of national consolidation.


Author(s):  
Walter Lowrie ◽  
Alastair Hannay

A small, insignificant-looking intellectual with absurdly long legs, Søren Kierkegaard (1813–1855) was a veritable Hans Christian Andersen caricature of a man. A strange combination of witty cosmopolite and melancholy introvert, he spent years writing under a series of fantastical pseudonyms, lavishing all the splendor of his mind on a seldom-appreciative world. He had a tragic love affair with a young girl, was dominated by an unforgettable Old Testament father, fought a sensational literary duel with a popular satiric magazine, and died in the midst of a violent quarrel with the state church for which he had once studied theology. Yet this iconoclast produced a number of brilliant books that have profoundly influenced modern thought. This classic biography presents a charming and warmly appreciative introduction to the life and work of the great Danish writer. It tells the story of Kierkegaard's emotionally turbulent life with a keen sense of drama and an acute understanding of how his life shaped his thought. The result is a wonderfully informative and entertaining portrait of one of the most important thinkers of the past two centuries.


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