scholarly journals DEFINIÇÃO ESTRATIGRÁFICA DA FORMAÇÃO MISSÃO VELHA, BACIA DO ARARIPE

2020 ◽  
Vol 30 (2) ◽  
pp. 3-25
Author(s):  
Aerson Barreto Junior ◽  
Gelson Fambrini ◽  
Wellington Silva Filho ◽  
Diego Silvestre ◽  
Virginio Neumann

The Missão Velha Formation corresponds to the fluvial deposits through the Jurassic-Cretaceous interval in the Araripe Basin, deposited under the context of the Afro-Brazilian Depression in the West Gondwana Early Rift Stage. The Missão Velha Formation stands out in the Araripe Basin mainly due to the occurrence of an assembly of silicified coniferous trunks. Although the Missão Velha Formation and the Dom João Stage deposits, in general, do not present diagnostic features of tectonism and active magmatism, a series of investigations in the last decade challenged the obviousness, seeking to understand the conditions of the early rift, through new comparative and interpretative methods. Under the sight of these new data and in order to facilitate communication between the authors, the present work proposes an objective delimitation and definition of the unit through the analysis of its state of the art and delimitation, tectonoestratigraphic conditions, and its geological and paleontological settings. The unit presents an internal unconformity and its lower and upper sequences present a distinction in the paleocurrents patterns that change from S-SE to NW, respectively; the facies association change from riverbeds with interdigitated floodplain deposits to high-energy braided channels deposits with the presence of silicified trunks. The assignment of the silicified trunks to the Dadoxylon-Araucarioxylon taxon should be discouraged, since this denomination is outdated accordingly the rules of the International Code of Botanical Nomenclature.

Author(s):  
P.E. Batson

Use of the STEM to obtain precise electronic information has been hampered by the lack of energy loss analysis capable of a resolution and accuracy comparable to the 0.3eV energy width of the Field Emission Source. Recent work by Park, et. al. and earlier by Crewe, et. al. have promised magnetic sector devices that are capable of about 0.75eV resolution at collection angles (about 15mR) which are great enough to allow efficient use of the STEM probe current. These devices are also capable of 0.3eV resolution at smaller collection angles (4-5mR). The problem that arises, however, lies in the fact that, even with the collection efficiency approaching 1.0, several minutes of collection time are necessary for a good definition of a typical core loss or electronic transition. This is a result of the relatively small total beam current (1-10nA) that is available in the dedicated STEM. During this acquisition time, the STEM acceleration voltage may fluctuate by as much as 0.5-1.0V.


2008 ◽  
Vol 3 (1) ◽  
pp. 91-95
Author(s):  
Ruth Amanda Estupiñán

In the red list of threatened species of Pará State, in Brazil, the salamander Bolitoglossa paraensis was listed as vulnerable. Initially the species was considered a synonym with Bolitoglossa altamazonica, but was recently revalidated. This note discusses the validity of the specimens from the west of the Brazilian Amazon identified as B. paraensis. It is also discussed the categorization of the species as vulnerable, and the records of the species was mapped in the Endemism area Belém. In order to establish a Private Natural Reserve (RPPN), a herpetological survey was carried out in different landscape units of the Nova Amafrutas, in Benevides (Pará), and the records of B. paraensis were mapped in these landscape units. By comparing the abundances recorded by Crump (1971) and those results of the present study, suggested that this species is tolerant to antropic “capoeira” forest (old fallows) next to undisturbed forest. More molecular phylogeographic studies are needed in order to establish a stable the taxonomy status for B. paraensis, and also the definition of its real endemic status in the Center of Endemism of Belém.


2021 ◽  
pp. 088541222199424
Author(s):  
Mauro Francini ◽  
Lucia Chieffallo ◽  
Annunziata Palermo ◽  
Maria Francesca Viapiana

This work aims to reorganize theoretical and empirical research on smart mobility through the systematic literature review approach. The research goal is to reach an extended and shared definition of smart mobility using the cluster analysis. The article provides a summary of the state of the art that can have broader impacts in determining new angles for approaching research. In particular, the results will be a reference for future quantitative developments for the authors who are working on the construction of a territorial measurement model of the smartness degree, helping them in identifying performance indicators consistent with the definition proposed.


2021 ◽  
pp. 1-17
Author(s):  
Jef Vandenberghe ◽  
Xun Yang ◽  
Xianyan Wang ◽  
Shejiang Wang ◽  
Huayu Lu

Abstract This paper describes an assemblage of diverse floodplain facies of reworked loess (facies b, c) in a Middle Pleistocene monsoonal setting of the Hanzhong Basin, central China. The vertical and lateral sedimentary sequences show changing energy conditions. Apart from the highest energy in the channel facies (facies a), a relatively high energy floodplain environment (facies b) prevailed in waterlogged conditions, with small, laterally migrating (sub)channels. Facies b generally interfingers with aggrading horizontal sheets of overbank deposits in alluvial pools and swamps in a floodplain with much lower energy (facies c), in which phases of stability (soil formation) occasionally interrupted overbank deposition. Reworked loess forms the main part of the floodplain deposits. The paleosols are considered to have been formed under low hydrodynamic conditions in an interglacial environment. These interglacial conditions follow the commonly assumed glacial conditions of channel facies a. The sedimentary successions in the floodplain show a recurrent composition and cyclicity between wet and dry floodplain sedimentation terminated by stability with soil formation. The cyclic rhythm of stacked high- and low-energy floodplain sediments is attributed to varied intensity of different hydrodynamic flooding events that may have been due to changing monsoonal rainfall or simple intrinsic fluvial behavior.


2016 ◽  
Vol 9 (6) ◽  
pp. 2152-2158 ◽  
Author(s):  
Joo Hyeong Lee ◽  
Chong S. Yoon ◽  
Jang-Yeon Hwang ◽  
Sung-Jin Kim ◽  
Filippo Maglia ◽  
...  

A Li-rechargeable battery system based on state-of-the-art cathode and anode technologies demonstrated high energy density, meeting demands for vehicle application.


2006 ◽  
Vol 2 (3) ◽  
pp. 403-422 ◽  
Author(s):  
Zhixing Xiao ◽  
Ingmar Björkman

The concept of a high commitment work system (HCWS) has mostly been used in the West to study the relationship between a firm's work systems and organizational performance. In this paper, we introduce a preliminary measure of HCWS in China based on the definition of Baron and Kreps (1999). In study 1, we tested the measure by surveying 442 employees in China's information technology (IT) industry. In study 2, we re-tested the same measure from the perspective of human resource (HR) executives in 126 foreign-invested companies. The analyses not only provided some evidence for the construct validity of this preliminary measure of a high commitment work system, but also produced some interesting results that can only be understood with regards to the history and institutional backgrounds of Chinese organizations.


Author(s):  
Yi. Zhou

Background. The category of style is one of the most used in modern musicology. This is due to objective reasons: the attention of the “consumer” of a cultural product is mostly not focused on its author recently. The coexistence of individual performance versions of composer’s works is one of the reasons that problems of stylistic attribution of musical art do not lose their relevance. In different areas of musical practice these problems are interpreted in different ways and get various degrees of theoretical understanding. The area of vocal art deserves special attention. An analysis of specialized literature suggests that the ever-increasing number of appropriate studies has not yet influenced the crystallization of the definition of “vocal style” in the scientific sense. This is due to the fact that the meaning of the term “vocal style” has many dimensions that reflect technological, aesthetic, historical, individual and national parameters of creativity. This resulted in the purpose of proposed article – to identify the singular and general in the interpretation of the category “vocal style” in Western European and Chinese art discourse. The research methodology is determined by its objectives; it is integrative and based on a combination of general scientific approaches and musicological methods. The leading research methods are historical, genre-stylistic and interpretative analyzes. Results. The word style first appeared in ancient Greece, where it was called a tool for writing on wooden tablets covered with wax. Later, the word style began to be used to describe not only human activity, but himself. At the same time, there is no case in Confucius’s “Analects” of using this definition. Central to the aesthetic block of Confucius’ teaching is not the question of the style of art, but the degree of influence that it has on the formation of the five moral qualities. As for questions directly about the style of artistic creation, Chinese scholars believe that they were first addressed by a contemporary and follower of Confucius, literary theorist Liu Xie, in whose works for the first time in the history of Chinese culture the word “style” was used. We note that in both Europe and China the studies of ancient thinkers have become the foundation for centuries and millennia that determined the essential parameters of the worldview of peoples and civilizations and stimulated the development of human thought. So nowadays style is similarly understood as a certain set of features that characterize either a particular person or the results of his activities. As for a narrower understanding of style (in our case – vocal style), it historically developed much later, which was preceded by a long evolution of vocal art and the accumulation of relevant scientific works. In addition, it is necessary to take into account the specific of vocal performance, the essence of which involves working with verbal texts, their artistic representation, and, consequently, the determinism of not only musical but also artistic embodiment of the work. Thus, in European treatises of Renaissance and Baroque periods it is not about the performer, but about the style of specific musical works, basic parameters of which are determined by the place of performance and the appropriate type of expression. At the same time, there are studies which examine the national aspect of the phenomenon of vocal performance, that is perceived as a consequence of the interaction of several factors: temperament, climate and landscape. It is interesting that even in the baroque treatises maxims about the advantages of the Italian school bel canto can be found; and nowadays it continues to determine the development of not only European but also world vocal art. We emphasize that we can not find Chinese treatises dating from the XVII–XVIII centuries, which are devoted to the comprehension of vocal art in the European sense of the word. After all, academic vocal culture in this country has begun to develop only in the early twentieth century and therefore imitated and appropriated the aesthetic and technology of the dominant European vocal style bel canto. It is known that the definition of bel canto is most often used in two cases: as a designation of a certain historical style, which is most vividly embodied in works of V. Bellini and G. Donizetti, and as a designation of singing technique. So we see that, as in other performing arts, the definition of style contains two interdependent parameters: technological and artistic and aesthetic. And the latter in the case of exactly vocal schools can be interpreted as a mobile factor. The similarity of interpretation of the definition of vocal style (namely one of its varieties – bel canto) in European and Chinese art literature is the result of the fact that eastern and western cultures are gradually approaching each other in the process of historical development. Conclusions. A comparative analysis of European and Chinese scientific sources suggests that the issues of musical stylistics occupied an important place in the minds of thinkers even before our era. And although both in the East and in the West the category of style was perceived as a mean of realization of the individual worldview of the man-creator, we can still talk about the difference in vectors of study of this problem. For example, if in the East it was perceived as a fundamental part of the ethical, in the West – the aesthetic. The formation of the phenomenon of “vocal style” was a natural consequence of the development of European vocal culture, where concepts of “technique” and “style” gradually crystallized. They became the basis of European vocal art, the assimilation of which has led to the phenomenal success of the modern Chinese school bel canto.


2021 ◽  
pp. SP523-2021-76
Author(s):  
Robert W. Dalrymple

AbstractThis study reviews the morphology, hydrodynamics and sedimentology of 33 modern straits, including examples from diverse tectonic and climatic settings. Strait morphology ranges from short, simple straits to long, tortuous passages many 100s of kilometers long; depths range from 10 m to >1 km. The morphological building block of strait sedimentation is a constriction flanked by open basins; a single strait can contain one or several of these. Currents accelerate through the constrictions and decelerate in the basins, leading to a spatial alternation of high- and low-energy conditions. Currents in a strait can be classified as either ‘persistent’ (oceanic currents or density-driven circulation) or ‘intermittent’ (tidally or meteorologically generated currents). Constrictions tend to be bedload partings, with the development of transport paths that diverge outward. Deposition occurs where the flow decelerates, generating paired subaqueous ‘constriction-related deltas’ that can be of unequal size. Cross-bedding predominates in high-energy settings; muddy sediment waves and contourite drifts are present in some straits. In shallow straits that were exposed during the sea-level lowstand, strait deposits typically occur near or at the maximum flooding surface, and can overlie estuarine and fluvial deposits. The most energetic deposits need not occur at the time of maximum inundation.Supplementary material at https://doi.org/10.6084/m9.figshare.c.5746061


Sign in / Sign up

Export Citation Format

Share Document