Optimal Control of Accelerations in a Base-Isolated Building using Magneto-Rheological Dampers and Genetic Algorithms

This article presents a numerical study aimed at improving effectiveness of the isolation system of an actual building by adding magneto-rheological (MR) dampers that act in parallel to the existing rubber bearings (RB). The building itself is modeled with uniaxial elastic elements. Additional elements that include the RBs and the MR dampers are added at the base of the building and two different genetic algorithms are used to optimize operation of the MR dampers. Maximum acceleration and relative displacement at the top of the building are taken as the variables to be minimized. Records of destructive earthquakes are used as input. A comparison is made between the building responses with RB and the one with the additional control system.     

When the Past becomes the Present

L'oracle pour les Recabites (Jr 35,18-19 TM // 42,18-19 LXX) presente quelques differences notables suivant qu'on le lit dans sa version massoretique ou dans la LXX. Il s'agit essentiellement du changement de locuteur et de destinataire, de la construction differente des personnages, ainsi que d'insistances differentes d'une version a l'autre. De la sorte, ce texte se revele etre un bon terrain pour verifier a petite echelle que les differences entre les narrations paralleles des deux versions connues du livre de Jeremie impliquent une strategie narrative differente, ce qui a un impact sur le sens du recit lui-meme pour le lecteur. L'article entend montrer tout l'interet qu'il y a a prendre au serieux separement le TM et la LXX, de sorte qu'apparaisse la specificite de chaque texte dans sa confrontation a l'autre. De la comparaison ressortiront des indications quant a la qualite eraire de chaque texte, mais aussi sans doute l'un ou l'autre indice concernant l'histoire textuelle de ce livre biblique.     

Postlesion Recovery of Motor and Sensory Cortex in the Early Twentieth Century

This article addresses early work on partial recovery that followed small motor cortical lesions. Leyton and Sherrington (1917 Leyton, ASF and Sherrington, CS. 1917. Observations on the excitable cortex of the chimpanzee, orang-utan and gorilla. Q J Exp Physiol, 11: 135–222.  [Google Scholar]) studied the motor cortex in apes, hoping to learn more about the contralateral muscle representations. Then they placed small lesions within the precentral cortex, followed by a loss of the contralateral muscle twitches. The sudden loss remained for about one week, but recovery was observed and continued for weeks, up to a standstill. Sherrington and Graham Brown (1913) Graham Brown, T and Sherrington, CS. 1913. Note on the functions of the cortex cerebri. J Physiol (Lond), 46: xxii [Google Scholar] observed the same results in a serial, chronic experiment on a chimpanzee. The brain was sent to Monakow's Brain-Institute in Zurich for investigating the lesions and the degeneration pattern. Constantin von Monakow (1853–1930) had been a pioneer on recovery after acute lesions, coining the term “diaschisis.” During WWI, Graham Brown and Stewart (1916) Graham Brown, T and Stewart, RM. 1916. On disturbances of the localization and discrimination of sensations in cases of cerebral lesions, and on the possibility of recovery of these functions after a process of training. Brain, 39: 348–454. [Crossref] , [Google Scholar] studied a soldier in a British army hospital who suffered from a cerebral gunshot wound, localized in the sensorimotor cortex. Early and prolonged rehabilitation was successful. In 1950, Glees (1909–1999) and Cole (Oxford) placed a small motor-cortical lesion in macaque monkeys; for a few days, the monkeys had difficulties and were slow for the task. Daily training was resumed and recovery was accelerated by alimentary reward. Finally, Lashley (1890–1958) understood that handicapped patients “achieved their goal with variable means.” This demonstrated the value of active and prolonged rehabilitation, in addition to the (passive) recovery of function.     

Approaches to the Archaeology of Ethnogenesis: Past and Emergent Perspectives

Recently, interest in the archaeology of ethnogenesis has surged. This renewed interest stems from innovations in the historical study of ethnogenesis, theoretical shifts favoring multidirectional agency, and relevant contemporary sociopolitical debates. Theoretical problems surrounding the appropriateness of the social science concept of “ethnicity,” however, have made the comparative study of ethnogenesis difficult. Drawing from past and emergent perspectives adds renewed vigor to comparative studies of ethnogenesis. A methodology that integrates the different types of theory can resolve the theoretical tensions in the archaeological study of ethnogenesis.     

经济一体化背景下的区域溢出分析

从溢出的角度研究区域间的互动关系是一个全新的视角。本文利用协方差统计模型对广东省与其他省区的溢出关系进行分析。结论是:在航空距离影响下,广东对所有省区都具有强度不同的正溢出效果,发挥了区域带动作用。在接受溢出方面,除了四川,甘肃,宁夏和黑龙江以外,其它省区对广东的溢出均表现出强度不同的正效应。对比分析广东对外溢出和获得溢出,可以看出经济水平邻近的长江三角洲地区、地理邻近省区均与广东表现出较强的相互正溢出效应。在区域间信息化缺口的影响下,广东与各区域之间溢出强度下降。     

Archeometric characterization of prehistoric grindstones from Milazzo Bronze Age settlement (Sicily,Italy)

The results of a petrographic and geochemical study carried out on archeological grindstones allow to provide new constraints on protohistoric commercial exchanges over the Mediterranean area. Eleven grindstones, discovered in an archeological site located in Milazzo (Messina, Sicily) and dated from the Early Bronze Age, have been investigated by geochemical and petrographic techniques. The raw materials are mainly volcanic rocks characterized by calc-alkaline and K-alkaline affinities with volcanic arc geochemical signature. Only one sample, made of basalt belonging to the Na-alkaline series, shows an intraplate signature. The comparison with the available literature data for similar rocks allowed constraining the volcanic origin of the exploited lavas. While the intraplate-type raw material came from Mt. Etna Volcano (Sicily), the arc-type volcanic rocks are mostly trachyandesites, basaltic andesites, and one rhyolite. Although most of them come from the Aeolian Arc, a provenance of some samples from the Aegean Arc cannot be excluded. This last region could represent the most probable provenance area for the rhyolite sample.     

The bronze artifacts from the Yejiashan site and the political presence of the Zhou dynasty in the middle Yangtze Plain: an application of lead isotope analysis

Lead isotope ratios of 15 Chinese bronze artifacts from the Yejiashan site (Suizhou City, Hubei Province) were analyzed and compared with copper ores across China. This study attempts to provide a new perspective to discuss the role that Zeng State played among all the vassal states in the early Zhou dynasty (ca. 1046–977 BC). The political presence of the Zhou dynasty in the middle Yangtze Plain is another main content of this paper. The lead isotopic characteristics of Chinese bronze artifacts between different historical periods are also in the scope of the study. By comparison, the lead isotopic ratios of the tested bronzes and copper deposits in the north Jiangxi Province show numerous overlaps. It indicates that the tested bronzes might have a single ore source, and this source was in the south of the Zhou dynasty. Combined with history and archaeological records, it is highly likely that the middle Yangtze Plain might be a part of the Zhou dynasty since the very beginning. Moreover, Zeng State might have a great influence in the ancient middle Yangtze Plain, and the nobles of Zeng State might even have authority to supervise certain area extending to Jiujiang. As lead isotopes of the bronzes appear to show a clear relation to chronology, the change of lead isotope patterns across times may further serve to distinguish the bronzes of the Western Zhou dynasty from the late Shang ones.