Pristine Early Eocene Wood Buried Deeply in Kimberlite from Northern Canada

We report exceptional preservation of fossil wood buried deeply in a kimberlite pipe that intruded northwestern Canada's Slave Province 53.3±0.6 million years ago (Ma), revealed during excavation of diamond source rock. The wood originated from forest surrounding the eruption zone and collapsed into the diatreme before resettling in volcaniclastic kimberlite to depths >300 m, where it was mummified in a sterile environment. Anatomy of the unpermineralized wood permits conclusive identification to the genus Metasequoia (Cupressaceae). The wood yields genuine cellulose and occluded amber, both of which have been characterized spectroscopically and isotopically. From cellulose d O and d H measurements, we infer that Early Eocene paleoclimates in the western Canadian subarctic were 12-17°C warmer and four times wetter than present. Canadian kimberlites offer Lagerstätte-quality preservation of wood from a region with limited alternate sources of paleobotanical information. © 2012 Wolfe et al.

Dependable wireless real-time communications for open environments

Wireless communication technologies have become widely adopted, appearing in heterogeneous applications ranging from tracking victims, responders and equipments in disaster scenarios to machine health monitoring in networked manufacturing systems. Very often, applications demand a strictly bounded timing response, which, in distributed systems, is generally highly dependent on the performance of the underlying communication technology. These systems are said to have real-time timeliness requirements since data communication must be conducted within predefined temporal bounds, whose unfulfillment may compromise the correct behavior of the system and cause economic losses or endanger human lives. The potential adoption of wireless technologies for an increasingly broad range of application scenarios has made the operational requirements more complex and heterogeneous than before for wired technologies. On par with this trend, there is an increasing demand for the provision of cost-effective distributed systems with improved deployment, maintenance and adaptation features. These systems tend to require operational flexibility, which can only be ensured if the underlying communication technology provides both time and event triggered data transmission services while supporting on-line, on-the-fly parameter modification. Generally, wireless enabled applications have deployment requirements that can only be addressed through the use of batteries and/or energy harvesting mechanisms for power supply. These applications usually have stringent autonomy requirements and demand a small form factor, which hinders the use of large batteries. As the communication support may represent a significant part of the energy requirements of a station, the use of power-hungry technologies is not adequate. Hence, in such applications, low-range technologies have been widely adopted. In fact, although low range technologies provide smaller data rates, they spend just a fraction of the energy of their higher-power counterparts. The timeliness requirements of data communications, in general, can be met by ensuring the availability of the medium for any station initiating a transmission. In controlled (close) environments this can be guaranteed, as there is a strict regulation of which stations are installed in the area and for which purpose. Nevertheless, in open environments, this is hard to control because no a priori abstract knowledge is available of which stations and technologies may contend for the medium at any given instant. Hence, the support of wireless real-time communications in unmanaged scenarios is a highly challenging task. Wireless low-power technologies have been the focus of a large research effort, for example, in the Wireless Sensor Network domain. Although bringing extended autonomy to battery powered stations, such technologies are known to be negatively influenced by similar technologies contending for the medium and, especially, by technologies using higher power transmissions over the same frequency bands. A frequency band that is becoming increasingly crowded with competing technologies is the 2.4 GHz Industrial, Scientific and Medical band, encompassing, for example, Bluetooth and ZigBee, two lowpower communication standards which are the base of several real-time protocols. Although these technologies employ mechanisms to improve their coexistence, they are still vulnerable to transmissions from uncoordinated stations with similar technologies or to higher power technologies such as Wi- Fi, which hinders the support of wireless dependable real-time communications in open environments. The Wireless Flexible Time-Triggered Protocol (WFTT) is a master/multi-slave protocol that builds on the flexibility and timeliness provided by the FTT paradigm and on the deterministic medium capture and maintenance provided by the bandjacking technique. This dissertation presents the WFTT protocol and argues that it allows supporting wireless real-time communication services with high dependability requirements in open environments where multiple contention-based technologies may dispute the medium access. Besides, it claims that it is feasible to provide flexible and timely wireless communications at the same time in open environments. The WFTT protocol was inspired on the FTT paradigm, from which higher layer services such as, for example, admission control has been ported. After realizing that bandjacking was an effective technique to ensure the medium access and maintenance in open environments crowded with contention-based communication technologies, it was recognized that the mechanism could be used to devise a wireless medium access protocol that could bring the features offered by the FTT paradigm to the wireless domain. The performance of the WFTT protocol is reported in this dissertation with a description of the implemented devices, the test-bed and a discussion of the obtained results.

Theorising and analysing digital labour: from global value chains to modes of production

This paper considers the following question—where do computers, laptops and mobile phones come from and who produced them? Specific cases of digital labour are examined—the extraction of minerals in African mines under slave-like conditions; ICT manufacturing and assemblage in China (Foxconn); software engineering in India; call centre service work; software engineering at Google within Silicon Valley; and the digital labour of internet prosumers/users. Empirical data and empirical studies concerning these cases are systematically analysed and theoretically interpreted. The theoretical interpretations are grounded in Marxist political economy. The term ‘global value chain’ is criticised in favour of a complex and multidimensional understanding of Marx’s ‘mode of production’ for the purposes of conceptualizing digital labour. This kind of labour is transnational and involves various modes of production, relations of production and organisational forms (in the context of the productive forces). There is a complex global division of digital labour that connects and articulates various forms of productive forces, exploitation, modes of production, and variations within the dominant capitalist mode of production.

Optimal methodology for distribution systems reconfiguration based on OPF and solved by decomposition technique

This paper presents a new and efficient methodology for distribution network reconfiguration integrated with optimal power flow (OPF) based on a Benders decomposition approach. The objective minimizes power losses, balancing load among feeders and subject to constraints: capacity limit of branches, minimum and maximum power limits of substations or distributed generators, minimum deviation of bus voltages and radial optimal operation of networks. The Generalized Benders decomposition algorithm is applied to solve the problem. The formulation can be embedded under two stages; the first one is the Master problem and is formulated as a mixed integer non-linear programming problem. This stage determines the radial topology of the distribution network. The second stage is the Slave problem and is formulated as a non-linear programming problem. This stage is used to determine the feasibility of the Master problem solution by means of an OPF and provides information to formulate the linear Benders cuts that connect both problems. The model is programmed in GAMS. The effectiveness of the proposal is demonstrated through two examples extracted from the literature.

O discurso teológico e a escravatura

Teólogos e juristas defendiam a escravatura, recorrendo todavia a maiores ou menores atenuantes. Tanto Ribeiro Rocha como Azeredo Coutinho, sustentando pontos de vista que muitas vezes mostram um forte contraste, são disto um bom exemplo.

A caracterização do trabalho análogo ao escravo na jurisprudência dos tribunais brasileiros

Based on bibliographical research and the analysis of court rulings, this study investigates the characterization of slave-like labor by Brazilian courts. After the alteration of article 149 of the Brazilian Penal Code, introduced by Law nº 10.803/2003, which typifies the practice of contemporary slavery in Brazil, divergent characterizations of this practice remain. The courts currently employ the broadest concept of contemporary slave labor, in which the crime is characterized by the engagement in one of the following conducts established as a criminal offense: labor with the restriction of freedom, submission to exhaustive working conditions, degrading working conditions, and debt bondage. The engagement in one of the above is therefore enough to constitute a crime. Contemporary slave labor in Brazil is not characterized only by the restriction of the worker’s freedom, as in the case of forced labor or debt bondage, but also through the submission of the workers to situations that offend their human dignity. Individual freedom and the dignity of the human person, fundamental tenets of the Brazilian Federal Constitution, are juridical resources safeguarded by law. Contemporary slavery is not limited to the mere infringement of labor laws, but represents a severe violation of the human rights of the workers involved.

Scaling In-Memory databases on multicores

Current computer systems have evolved from featuring only a single processing unit and limited RAM, in the order of kilobytes or few megabytes, to include several multicore processors, o↵ering in the order of several tens of concurrent execution contexts, and have main memory in the order of several tens to hundreds of gigabytes. This allows to keep all data of many applications in the main memory, leading to the development of inmemory databases. Compared to disk-backed databases, in-memory databases (IMDBs) are expected to provide better performance by incurring in less I/O overhead. In this dissertation, we present a scalability study of two general purpose IMDBs on multicore systems. The results show that current general purpose IMDBs do not scale on multicores, due to contention among threads running concurrent transactions. In this work, we explore di↵erent direction to overcome the scalability issues of IMDBs in multicores, while enforcing strong isolation semantics. First, we present a solution that requires no modification to either database systems or to the applications, called MacroDB. MacroDB replicates the database among several engines, using a master-slave replication scheme, where update transactions execute on the master, while read-only transactions execute on slaves. This reduces contention, allowing MacroDB to o↵er scalable performance under read-only workloads, while updateintensive workloads su↵er from performance loss, when compared to the standalone engine. Second, we delve into the database engine and identify the concurrency control mechanism used by the storage sub-component as a scalability bottleneck. We then propose a new locking scheme that allows the removal of such mechanisms from the storage sub-component. This modification o↵ers performance improvement under all workloads, when compared to the standalone engine, while scalability is limited to read-only workloads. Next we addressed the scalability limitations for update-intensive workloads, and propose the reduction of locking granularity from the table level to the attribute level. This further improved performance for intensive and moderate update workloads, at a slight cost for read-only workloads. Scalability is limited to intensive-read and read-only workloads. Finally, we investigate the impact applications have on the performance of database systems, by studying how operation order inside transactions influences the database performance. We then propose a Read before Write (RbW) interaction pattern, under which transaction perform all read operations before executing write operations. The RbW pattern allowed TPC-C to achieve scalable performance on our modified engine for all workloads. Additionally, the RbW pattern allowed our modified engine to achieve scalable performance on multicores, almost up to the total number of cores, while enforcing strong isolation.

Le Mariale lyonnais (Paris, BNF, fr. 818). Édition, traduction et étude linguistique

Le manuscrit de Paris, BNF, fr. 818, connu des francoprovençalistes pour sa collection de légendes hagiographiques en scripta lyonnaise, renferme également l'une des plus amples collections de miracles de Notre-Dame en langue vernaculaire du XIIIe siècle. À la différence des Légendes en prose, ce « Mariale » en vers (probablement dû au même auteur anonyme) a été rédigé dans une scripta 'francoprovençalisante', soit dans une langue qui se veut française, mais qui laisse transparaître un bon nombre de traits de l'idiome natal de l'auteur. Longtemps demeuré dans l'ombre des Légendes, le Mariale lyonnais restait jusqu'ici partiellement inédit, et sa langue n'avait jamais fait l'objet d'une étude exhaustive. Le présent ouvrage comble cette double lacune en proposant d'une part l'édition, la traduction et le glossaire des miracles qui restaient à faire connaître, d'autre part une étude linguistique portant sur l'ensemble du corpus et mettant en lumière la richesse des matériaux francoprovençaux offerts par ce recueil.

Forschungen zur Artusepik / von Rudolf Zenker,...

Collection : Beihefte zur "Zeitschrift für romanische Philologie" ; 70

Der Dialekt von Bergün und seine Stellung innerhalb der rätoromanischen Mundarten Graubündens / von C. Martin Lutta ; [Geleitwort von L. Gauchat, J. Jud und F. Frankhauser]

Collection : Beihefte zur "Zeitschrift für romanische Philologie" ; 71. Heft

Recueil de textes littéraires, en prose et en vers : Roman des Sept sages ; Marqués de Rome ; Miracles de Notre-Dame, en vers, par GAUTIER DE COINCY ; la Conception de Notre-Dame, en vers, par WACE.

Contient : IRoman des Sept sages ; « Ci commance li livres des VII sages de Rome... Il ot jadis I emperere à Rome, qui ot non Diocliciens ; il ot eu famme... » ; «... aprés l'ampereour fu son fill ampereres tant coume il vesqui. Explicit. Explicit » ; IIMarqués de Rome ; « Ci commance li romanz de Marqués, le filz Chaton. Jadis out I empereeur à Rome, qui avoit non Diocliciens ; li empereres fu mult vieuz hom... » ; « ... et vesquirent ainsint en samble toutes leurs vies. Ici faut li rommanz de Marqués et des VII sages de Rome » ; IIIMiracles de Notre-Dame, en vers, par GAUTIER DE COINCY, incomplets du début. Exemplaire non cité dans l'édition de l'abbé Poquet ; Fragments du Prologue ; Les Miracles de la sainte Vierge, publiés par l'abbé Poquet, 1857, vers 25-30, 62-69, 99-106, 138-142 ; Suite du Prologue, à partir du vers 143 ; Fin du Prologue : « ... La langue GAUTIER DE CHOISI (sic), Qui por s'amor commance einsi » ; Miracle de Théophile : « Por ceus esbatre et deporter... » ; Les Miracles de la sainte Vierge, col. 50 ; « Un biau miracle vos récite... » ; Les Miracles de la sainte Vierge, col. 423 ; « Tenez silence, bones genz... » ; Les Miracles de la sainte Vierge, col. 355 ; « Un biau miracle vos weil dire... » ; Les Miracles de la sainte Vierge, col. 291 ; « [M]es livres me dit et revelle... » ; Les Miracles de la sainte Vierge., col. 475 ; « Ci aprés vell metre en brief... » ; Les Miracles de la sainte Vierge, col. 501 ; « Queque talant avez d'oïr... » ; Les Miracles de la sainte Vierge, col. 511 ; « De l'abesse qui fu enceinte, que Nostre Dame délivra de son enfant en dormant. Une abesse fu jadis, Qui la dame de Paradis... » ; Ulrich, dans Zeitschrift für romanische Philologie, t. VI (1882), p. 334 ; « Un miracle truis d'un provoire... » ; édit. Poquet, col. 323 ; « Un moine fu d'une abahie... » ; édit. Poquet, col. 327 ; « Por plusors cuers plus enflammer... » ; édit. Poquet, col. 341 ; « Un arcevesque ot à Touleste... », texte très abrégé ; édit. Poquet, col. 77 ; « Tuit li miracle Nostre Dame... » ; édit. Poquet, col. 429 ; « Entendez tuit, et cler et lai... » ; édit. Poquet, col. 517 ; « Tant convolante me semont... » ; édit. Poquet, col. 303 ; « Pour ce qu'oiseuse est mort à l'ame... » ; édit. Poquet, col. 523 ; « [C]i fu un clers, un damoisiaux... » ; édit. Poquet, col. 363 ; « Entendez tuit, faites silence... » ; édit. Poquet, col. 443 ; « Des V siaumes de Maria. Un brief miracle vos veil dire, Conter vos veil d'un simple moinne... » ; édit. Poquet, col. 359 ; « Si com mes [livres] me tesmoigne... » ; édit. Poquet, col. 455 ; « A ceus qui aiment doucement... » ; édit. Poquet, col. 493 ; « A la loange de la Virge... » ; texte abrégé, comprenant seulement les 114 premiers vers ; édit. Poquet, col. 481 ; « Queque d'oïr estes en grant... » ; édit. Poquet, col. 505 ; « A Chartres fu ce truis uns clers... » ; édit. Poquet, col. 297 ; « Bien est que nos le bien dions... » ; édit. Poquet, col. 347 ; « Cele en cui prist humanité... », texte incomplet ; édit. Poquet, col. 461 ; « De la nonnein que li chevalliers espoussa. A la gloire la glorieuse, Une merveille merveilleuse... » ; Ulrich, dans Zeitschrift für romanische Philologie, t. VI (1882), p. 339 ; « ... Et serront tant com Dieux dura, Beneoiz soit qui l'endurra. Amen. Amen. Explicit les miracles de Nostre Dame sainte Marie, la douce dame et la beningne » ; IVLa Conception de Notre-Dame, par WACE ; « Ci commance la vie Nostre Damne. El non Dieu, qui nous doint sa grace, Oiiez que nos dit mestre GASCE... » — Le texte est incomplet des 18 derniers vers, et s'arrête (fol. 200 v°, col. 2) à ces mots : « ... Si Jonas en la mer sauva, Les IIII enfanz el feu garda, Bien pout donques [resusciter...] » ; cf La vie de la vierge Marie, de maître Wace, p. p. V. Luzarche, Tours, 1859, p. 90

Rick Bell Family fonds, 1874-1875, 1879, 1884, 1886, 1888-1889, 1896, 1898, 1909-1910, 1939, 1945, n.d.

Lewis Tyrell married Jane Gains on August 31, 1849 in Culpeper Court House, Virginia. Jane Gains was a spinster. Lewis Tyrell died September 25, 1908 at his late residence, Vine St. and Welland Ave., St. Catharines, Ont. at the age of 81 years, 5 months. Jane Tyrell died March 1, 1886, age 64 years. Their son? William C. Tyrell died January 15, 1898, by accident in Albany, NY, age 33 years, 3 months. John William Taylor married Susan Jones were married in St. Catharines, Ont. on August 10, 1851 by William Wilkinson, a Baptist minister. On August 9, 1894 Charles Henry Bell (1871-1916), son of Stephen (1835?-1876) and Susan Bell, married Mary E. Tyrell (b. 1869?) daughter of Lewis and Alice Tyrell, in St. Catharines Ontario. By 1895 the Bell’s were living in Erie, Pennsylvania where children Delbert Otto (b. 1895) and Edna Beatrice (b. 1897) were born. By 1897 the family was back in St. Catharines where children Lewis Tyrell (b. 1899), Gertrude Cora (b. 1901), Bessie Jane (b. 1902), Charles Henry (b. 1906), Richard Nelson (b. 1911) and William Willoughby (b. 1912) were born. Charles Henry Bell operated a coal and ice business on Geneva Street. In the 1901 Census for St. Catharines, the Bell family includes the lodger Charles Henry Hall. Charles Henry Hall was born ca. 1824 in Maryland, he died in St. Catharines on November 11, 1916 at the age of 92. On October 24, 1889 Charles Hall married Susan Bell (1829-1898). The 1911 Census of Canada records Charles Henry Hall residing in the same household as Charles Henry and Mary Bell. The relationship to the householder is step-father. It is likely that after Stephen Bell’s death in 1876, his widow, Susan Bell married Hall. In 1939, Richard Nelson Bell, son of Charles Henry and Mary Tyrell Bell, married Iris Sloman. Iris (b. 22 May 1912 in Biddulph Township, Middlesex, Ontario) was the daughter of Albert (son of Joseph b. 1870 and Elizabeth Sloman, b. 1872) and Josie (Josephine Ellen) Butler Sloman of London, Ont. Josie (b. 1891) was the daughter of Everett Richard and Elizabeth McCarthy (or McCarty) Butler, of Lucan Village, Middlesex North. According to the 1911 Census of Canada, Albert, a Methodist, was a porter on the railroad. His wife, Josephine, was a Roman Catholic. Residing with Albert and Josie were Sanford and Sadie Butler and Sidney Sloman, likely siblings of Albert and Josephine. The Butler family is descended from Peter Butler, a former slave, who had settled in the Wilberforce Colony in the 1830s. Rick Bell b. 1949 in Niagara Falls, Ont. is the son of Richard Nelson Bell. In 1979, after working seven years as an orderly at the St. Catharines General Hospital while also attending night school at Niagara College, Rick Bell was hired by the Thorold Fire Dept. He became the first Black professional firefighter in Niagara. He is a founding member of the St. Catharines Junior Symphony; attended the Banff School of Fine Arts in 1966 and also performed with the Lincoln & Welland Regimental Band and several other popular local groups. Upon the discovery of this rich archive in his mothers’ attic he became passionate about sharing his Black ancestry and the contributions of fugitive slaves to the heritage Niagara with local school children. He currently resides in London, Ont.

Wirklichkeit und Fiktion : Alfred Döblins „Tatsachenphantasie“ in seinem historischen Roman „November 1918“

Thèse réalisée en co-tutelle avec l'Université Libre de Berlin, Institut für Deutsche und Niederländische Philologie