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Sample records for bronze marcos da

  1. Neutralidade de Rede: O caso Comcast v. Netflix e o Marco Civil da Internet

    Directory of Open Access Journals (Sweden)

    Maria Eduarda Cintra

    2015-05-01

    Full Text Available Propósito – O artigo pretende fazer uma reflexão sobre como o Estado brasileiro avançou quanto à defesa do princípio da neutralidade de rede. Para essa análise, será utilizado o caso Comcast vs. Netflix como exemplo para comparar as ações do Estados Unidos e do Brasil sobre o tema. Metodologia/abordagem/design – O texto segue o método de abordagem de análise de problema para poder tirar conclusões sobre as práticas adotadas pelos Estados Unidos e pelo Brasil. Resultados – Foi constatado que o Brasil está na vanguarda sobre governança da internet, especialmente por zelar pela neutralidade de rede. Implicações práticas – O artigo serve para compreensão da discussão sobre neutralidade de rede e, especialmente, sobre o processo do Marco Civil da Internet no Brasil. Originalidade/relevância do texto – O artigo, ao fornecer uma perspectiva comparada entre o Estado americano e brasileiro, mostra como esse bem público, qual seja o da internet neutra e aberta, tem sido preservado.

  2. Marco Civil da Internet: uma lei sem conteúdo normativo

    Directory of Open Access Journals (Sweden)

    Eduardo Tomasevicius Filho

    2016-04-01

    Full Text Available A Lei n.12.965, de 23 de abril de 2014, promulgou o denominado Marco Civil da Internet, com o intuito de estabelecer princípios, garantias, direitos e deveres para os usuários de internet no Brasil. Embora se tenha comemorado sua aprovação, por supostamente as demais normas jurídicas vigentes no Brasil - como a Constituição Federal, o Código Civil e o Código Penal - não terem aplicação nas relações sociais entabuladas pela internet, essa lei apresenta poucas inovações e muitas insuficiências e deficiências de cunho jurídico. Somando-se a esse fato a impossibilidade jurídica de regulação de uma rede mundial de computadores por meio de lei de um único país, os problemas gerados pela internet continuarão a afetar a privacidade, honra e imagem das pessoas, ao mesmo tempo em que conquistas, como a da neutralidade da rede, terão pouco impacto na vida das pessoas.

  3. Marcos legais da propaganda de medicamentos: avanços e retrocessos Legal frameworks of drug advertisement: progress and setbacks

    Directory of Open Access Journals (Sweden)

    Carolina Pires Araújo

    2012-01-01

    Full Text Available Desde o início da civilização brasileira, já existe divulgação de produtos farmacêuticos, sendo os medicamentos os preferidos dos anúncios. A propaganda de medicamentos, enquanto estratégia persuasiva, pode representar risco sanitário, caso não se comprometa com a divulgação de informação correta e segura. Nesse sentido, várias são as tentativas de controle sanitário por parte do Estado, as quais parecem consolidar-se em embates de domínio ético e legal. Em busca de compreender o contexto que norteia a atual conjuntura da problemática sobre propaganda de medicamentos, o presente estudo traça um percurso histórico, a partir dos principais marcos legais: a Junta Central de Higiene (1851, a Lei de Vigilância Sanitária (1976 e a criação da ANVISA (1999. Identificou-se que os marcos acompanham o contexto estrutural do país, contribuindo para a consolidação do campo da regulação hoje.Since the beginning of Brazilian civilization, there is already disclosure of pharmaceutical drugs being the favorite of the ads. The advertising of medicines, while persuasive strategy, may represent health risk, if not compromised with the release of accurate and safe information. For that reason, there are several attempts at sanitary control by the state, which appears to be consolidated in the struggles of the ethical and legal domain. In seeking to understand the context that guides, the current situation of the drug advertising problem, this study provides a historical background, from the main legal frameworks: "Junta Central de Higiene" (1851, "Lei de Vigilância Sanitária" (1976 and the creation of "ANVISA" (1999. It was identified that milestone follows the country structural context, contributing to the consolidation of the regulation's field nowadays.

  4. AVANÇOS E PERSPECTIVAS DA RENAME APÓS NOVOS MARCOS LEGAIS: O DESAFIO DE CONTRIBUIR PARA UM SUS ÚNICO E INTEGRAL

    Directory of Open Access Journals (Sweden)

    José Miguel do Nascimento Júnior

    2015-10-01

    Full Text Available Objetivos: O presente artigo tem por objetivo descrever o processo de atualização da Relação Nacional de Medicamentos Essenciais (RENAME, contextualizando-o à luz de novos marcos legais do Sistema Único de Saúde (SUS. Métodos: Trata-se de um estudo descritivo, de natureza crítica-reflexiva, estruturado em dois momentos: a o processo de atualização da RENAME com a instituição dos novos marcos legais e b discussão dos avanços, desafios e perspectivas da RENAME com o advento dos marcos legais descritos. Resultados: Discute-se a nova concepção da RENAME e sua harmonização com as diretrizes do SUS, discorrendo sobre aspectos dos processos de incorporação, de responsabilização pelo financiamento e de pactuação interfederativa, e seus impactos no acesso aos medicamentos. Conclusões: As mudanças nos marcos legais contribuíram para a aproximação das políticas de incorporação tecnológica e de assistência farmacêutica no âmbito do SUS, tornando a nova RENAME um instrumento importante para a qualificação da gestão e para a garantia do acesso a medicamentos eficazes, efetivos e seguros à população brasileira. Descritores: Medicamentos Essenciais; Assistência Farmacêutica; Gestão em Saúde; Financiamento da Assistência à Saúde; Sistema Único de Saúde.  

  5. Bronze Saddlery

    Institute of Scientific and Technical Information of China (English)

    1996-01-01

    A number of relics were unearthed when Chinese archaeologists discovered a group of graves in Liaoning Province in April, 1976. Dating back to the Spring and Autumn Period and the Warring States Period, the tombs contained many bronze ornaments for saddles that featured such animals as frogs, snakes, tigers and rabbits.

  6. NANOMEDICAMENTOS E OS DESAFIOS DA ANVISA DIANTE DA INEXISTÊNCIA DE UM MARCO REGULATÓRIO NO BRASIL

    Directory of Open Access Journals (Sweden)

    Liziane Paixão Silva Oliveira

    2016-08-01

    Full Text Available A nanotecnologia, em razão de suas propriedades singulares, pode proporcionar inúmeros benefícios em diversas áreas estratégicas: saúde, eletrônica, alimentação, agricultura, meio ambiente entre outras. Um dos ramos mais promissores é o desenvolvimento e comercialização de nanomedicamentos que prometem revolucionar o campo de aplicação da medicina. No Brasil, a Agência Nacional de Vigilância Sanitária (ANVISA, que tem suas atribuições definidas na Lei nº 9.782/1999, é o órgão responsável por fiscalizar a produção e a comercialização desses novos medicamentos. Nesse artigo, será dado enfoque aos desafios da ANVISA considerando a existência de nanomedicamentos no mercado de consumo que não são identificados ou reconhecidos como tais pela vigilância sanitária diante da inexistência de uma norma regulatória nacional.

  7. Aspectos reprodutivos e dieta alimentar dos ninhegos de Rhinoptynx clamator (Aves: Strigidae no campus Marco Zero da Universidade Federal do Amapá, Macapá-AP Nesting and diet of Rhinoptynx clamator (Aves: Strigidae from Campus Marco Zero da Universidade Federal do Amapá, Macapá-AP

    Directory of Open Access Journals (Sweden)

    Kurazo Mateus Okada Aguiar

    2009-03-01

    Full Text Available Este trabalho tem como objetivo relatar os aspectos comportamentais de nidificação, alimentação e desenvolvimento dos ninhegos de Rhinoptynx clamator (Strigidae em um fragmento florestal no Campus Marco Zero da Universidade Federal do Amapá. Apenas um ninho foi encontrado, no solo e na base de um tucumã Astrocaryum oleatum. Três ovos brancos com manchas marrons foram observados, cuja medida foi de 41 x 35 mm em média. A incubação durou 28 dias e foi efetuada pela fêmea, e o último filhote a nascer viveu apenas dois dias. Os filhotes sobreviventes foram medidos durante o seu desenvolvimento. Durante a estação reprodutiva foram coletadas algumas pelotas de regurgitação, sendo encontrados três tipos de vertebrados: Rattus sp., Micoureus cf. regina e Columbina talpacoti.We report nesting behavior, feeding and development of nestling of Rhinoptynx clamator (Strigidae in a forest fragment on Campus Marco Zero of Universidade Federal do Amapá. The nest was located on the ground, close to a palm Astrocaryum oleatum and three eggs were observed. These eggs were white whit brown spots and measured 41 x 35 mm in average. Incubation was made by female and lasted 28 days and the last owlet died two days after born. The remaining birds were measured during its development. Feeding items includes Rattus sp., Micoureus cf. regina and Columbina talpacoti.

  8. Estudio de la caída libre desde marcos de referencia no inerciales usando herramientas computacionales

    Directory of Open Access Journals (Sweden)

    John Hernán Díaz Forero

    2014-05-01

    Full Text Available Se elaboró una propuesta para la enseñanza e implementación del modelo de Galileo (descripción del movimiento del punto material —partícula— en el espacio y en el tiempo en los cursos de física para ciencias e ingeniería, realizando una clase de física mediante la resolución de problemas no convencionales, específicamente la descripción de la caída libre desde sistemas de referencia no inerciales. En particular, se considera en el espacio bidimensional de coordenadas un observador inercial en el origen de coordenadas, que percibe un sistema de dos partículas con la propiedad masa m, con diferentes posiciones iníciales y velocidades iniciales, que están en presencia del campo gravitacional g , y se resuelve el problema desde sistemas de referencia no inerciales montados en las partículas 1 y 2. Se realizó una animación apoyados en el uso de nuevas tecnologías computacionales (el software Interactive Physics.

  9. Bronze rainbow hologram mirrors

    Science.gov (United States)

    Dawson, P.

    2006-02-01

    This project draws on holographic embossing techniques, ancient artistic conventions of bronze mirror design and modelling and casting processes to accomplish portraiture of reflection. Laser scanning, 3D computer graphics and holographic imaging are employed to enable a permanent 3D static holographic image to appear integrated with the real-time moving reflection of a viewer's face in a polished bronze disc. The disc and the figure which holds it (caryatid) are cast in bronze from a lost wax model, a technique which has been used for millennia to make personal mirrors. The Caryatid form of bronze mirror which went through many permutations in ancient Egyptian, Greece and Rome shows a plethora of expressive figure poses ranging from sleek nudes to highly embellished multifigure arrangements. The prototype of this series was made for Australian choreographer Graeme Murphy, Artistic Director of the Sydney Dance Company. Each subsequent mirror will be unique in figure and holographic imagery as arranged between artist and subject. Conceptually this project references both the modern experience of viewing mirrors retrieved from ancient tombs, which due to deterioration of the surface no longer reflect, and the functioning of Chinese Magic mirrors, which have the ability to project a predetermined image. Inspired by the metaphorical potential of these mirrors, which do not reflect the immediate reality of the viewer, this bronze hologram mirror series enables each viewer to reflect upon himself or herself observing simultaneously the holographic image and their own partially obliterated reflection.

  10. Scientific framework of homeopathy: evidence-based homeopathy Marco científico de la homeopatía: homeopatía basada en evidencia Marco científico da homeopatia: homeopatia baseada em evidências

    Directory of Open Access Journals (Sweden)

    Michel Van Wassenhoven

    2008-06-01

    Full Text Available This paper aims at considering all important aspects of the scientific framework of homeopathic practice, looking at the levels of scientific evidence of each aspect in an objective way, through an extensive review of literature. Levels of evidence considered are: I existence of meta-analyses and/or systematic positive reviews of literature; IIa multiple positive randomized controlled trials (RCTs; IIb some positive RCTs; IIIa positive multiple cohorts studies; IIIb positive studies with some cohorts; IV opinion of experts (clinical and daily practice cases. Conclusions are clear: homeopathy must stay within the framework of medical practice, and it is even a necessity for public health. Keywords: Evidence-Based medicine, Homeopathy, Scientific framework, Literature review.   Marco científico da homeopatia: homeopatia baseada em evidências Resumo O presente artigo aborda aspectos importantes do marco científico da prática homeopática, focando os níveis de evidência de cada um deles de maneira objetica, através de uma revisão extensa da literatura. Os níveis de evidência considerados são: I existência de meta-análises e/ou revisões sistemáticas positivas da literatura; IIa múltiplos estudos randomizados controlados (RCTs positivos; IIb alguns RCTs positivos; IIIa estudos de coortes múltiplas positivos; IIIb estudos com algumas coortes positivos; IV opinião de expertos (casos clínicos da prática cotidiana. As conclusões são claras: a homeopatia deve permanecer dentro do marco da prática médica, sendo, inclusive, uma necessidade para a saúde pública. Palavras-chave: Medicina Baseada em Evidências, Homeopatia, Estrutura ciêntifica, Revisão de literatura.   Marco científico de la homeopatía: homeopat

  11. Bronze Age Acrobats

    DEFF Research Database (Denmark)

    Iversen, Rune

    2014-01-01

    immaterial, ritual and cosmological exchange that characterized the second and early firstmillennium BC.Beliefs and ritual practices went hand in hand with the adoption of a series of elite items and an aristocratic lifestyle, thereby creating a unique and fascinating European Bronze Age....

  12. 33 CFR 110.74 - Marco Island, Marco River, Fla.

    Science.gov (United States)

    2010-07-01

    ... ANCHORAGES ANCHORAGE REGULATIONS Special Anchorage Areas § 110.74 Marco Island, Marco River, Fla. Beginning... place will be allowed. Fixed mooring piles or stakes are prohibited. All moorings shall be so...

  13. Vegetables, Coctails & Reflections / Marco Laimre

    Index Scriptorium Estoniae

    Laimre, Marko, 1968-

    2006-01-01

    Pealkirja "Vegetables, Coctails & Reflections" kandis Tallinna Kunstihoones 8.04.-28.05.2006 avatud Elin Kardi, Marko Mäetamme, Marco Laimre ja Andres Tali ühisnäitusel "Vägivald ja propaganda" Marco Laimre installatsioon. Marco Laimre esinemine raadiosaates "kunst.er" Klassikaraadios 16.04.2006

  14. Marco Calamari, La scomparsa della rete

    Directory of Open Access Journals (Sweden)

    Maria Chiara Pievatolo

    2011-12-01

    Full Text Available Chi era in rete prima che fosse invasa dalle moltitudini – scrive Marco Calamari su “Punto Informatico” – temeva principalmente la sua occupazione “militare” da parte degli stati,  tramite una censura e un controllo capillare. Non è andata esattamente così. L’”economia del dono“, per la sua eccellenza tecnica, ha retto alla pressione delle masse e [...

  15. Políticas e gestão da educação superior a distância: novos marcos regulatórios? Politics and management of the superior education in the distance: new regulatory landmarks?

    Directory of Open Access Journals (Sweden)

    Luiz Fernandes Dourado

    2008-10-01

    Full Text Available Ao problematizar as políticas e gestão atuais para a educação básica e superior, o artigo enfoca os novos marcos regulatórios do processo expansionista e analisa as políticas direcionadas à formação de professores, com especial realce para a educação a distância no setor público. Nessa direção, apresenta e analisa alguns indicadores educacionais e busca apreender, no campo das políticas propostas pelo MEC, o papel da " Nova CAPES" como espaço de regulação das políticas de formação de professores, enfatizando a expansão pública, na modalidade EaD, por meio dos desafios da consolidação da Universidade Aberta do Brasil (UAB.To evaluate the current politics and management for the basic and superior education, the article focuses new regulatory landmarks of the expansion process and analyzes the politics directed to the formation of professors, with special distinction for the education in the distance in the public sector. In this direction, it presents and it analyzes some educational pointers and it searchs to apprehend, in the field of the politics proposals for the MEC, the paper of the " New CAPES" as space of regulation of the politics of formation of professors, emphasizing the public expansion, in the EaD modality, by means of the challenges of the consolidation of the Open University of Brazil (UAB.

  16. Marcos referenciais da trajetória das políticas de alimentação e nutrição no Brasil Milestones of the feeding policies and nutrition in Brazil

    Directory of Open Access Journals (Sweden)

    Bertoldo Kruse Grande de Arruda

    2007-09-01

    Full Text Available Os marcos que influenciaram a concepção e a implementação de propostas inovadoras no campo da nutrição surgiram na década de 30. O inquérito promovido por Josué de Castro no Recife, em 1933, sobre as condições de vida das classes operárias revelou a ocorrência de déficit calórico e de nutrientes e motivou o desenvolvimento de novas pesquisas acerca da situação alimentar em Pernambuco, Rio de Janeiro e São Paulo, estabelecendo as relações entre alimentação e salário mínimo. Para dar assistência ao governo na formulação da Política Nacional de Alimentação e Nutrição foi criado o Instituto Nacional de Alimentação e Nutrição (INAN, em 1972, e elaborado o I Programa Nacional de Alimentação e Nutrição (PRONAN, envolvendo 12 subprogramas das diversas estruturas governamentais e, com olhar inovador da desnutrição como uma doença social foi substituído, em 1976, pelo II PRONAN. A extinção do INAN, em 1997, conduziu ao surgimento da Coordenação Geral da Política de Alimentação e Nutrição, responsável pela elaboração da Política Nacional de Alimentação e Nutrição no contexto da Segurança Alimentar e Nutricional, criando em 2001 o Programa Bolsa Alimentação. A criação do Conselho Nacional de Segurança Alimentar, em 1993, fomentou a aprovação do Programa Fome Zero. Identifica-se que na realidade brasileira, a avaliação das políticas públicas é um campo tradicionalmente marcado pela carência de procedimentos sistemáticos.The milestones of the concept and implementation of innovative proposals in the field of nutrition appeared in the 30's. The 1933 survey performed by Josué de Castro in Recife focusing the qualify of life of the working classes determined calories' and nutrients' deficiencies and encouraged the development of new researches focusing on the food situation in Pernambuco, Rio de Janeiro and São Paulo, esta-blishing a relationship between food and minimum wage. To

  17. Ancient Chinese Bronzes: Teacher's Packet.

    Science.gov (United States)

    Smithsonian Institution, Washington, DC. Arthur M. Sackler Gallery.

    The focus of this teacher's packet is the bronze vessels made for the kings and great families of the early Chinese dynasties between 1700 B.C. and 200 A.D. The materials in the guide are intended for use by teachers and students visiting the exhibition, "The Arts of China," at the Arthur M. Sackler Gallery of the Smithsonian Institution in…

  18. Bronze Statuettes in Roman Graves

    Directory of Open Access Journals (Sweden)

    Margherita Bolla

    2014-02-01

    Full Text Available This research follows the investigations about the relationship between bronze statuettes and contexts in Roman times, particularly explored by Annemarie Kaufmann-Heinimann. The rarity of bronze figures (human, divine and animals in Roman tombs of Imperial age has been repeatedly emphasized. The aim of the paper is the collection, not exhaustive, of evidences in funerary contexts, to determine their meaning. From a methodological point of view, it was necessary to exclude figurines placed in graves but with other originary functions and several bronzes whose finding in tombs is unreliable. This preliminary survey has given about eighty all-round bronzes from burials, distributed in different areas, both in the Empire and marginal. Considering the huge amount of Roman burials known today, the overall evidence is scarce but allows some observations; it is evident the pre-eminence of Venus and Mercury, gods which had a funerary role. There is also an attempt to find the reasons of the rarity of metal statuettes in the tombs of roman period.

  19. Marco Grippeling (1966-2014)

    CERN Multimedia

    2014-01-01

    It was with great sadness that we learnt that our former colleague and friend Marco Grippeling was amongst the victims of the Malaysia Airlines crash.   Marco, a Melbourne-based cyber security specialist, boarded flight MH17 on his way back to Australia after spending his last days with friends and family in his home country of the Netherlands. Marco joined CERN as a Technical Student in the PS Division in 1992.  In 1994 he moved to the LHC Division as a Staff Member, leaving for more exotic horizons in 2000. Marco will always be remembered for his enthusiasm and joie de vivre. Our deepest condolences go to his family and friends at this time. His former colleagues and friends at CERN

  20. Decorative layers on tin bronzes

    Directory of Open Access Journals (Sweden)

    Z. Konopka

    2010-10-01

    Full Text Available Decorative layers are decisive for aesthetic value of castings, therefore significant demands are raised towards such layers, e.g. pleasant durable colour, gloss, and smoothness. The work discusses the influence of the type of mechanical working applied to the surfaces of CuSn10 tin bronze castings on the quality and durability of a decorative coating. The scope of the work has included designing and manufacturing of cast samples of tin bronze, mechanical working of the surfaces in order to prepare them for applying coating layers,generating decorative layers as a result of chemical reactions, and the quality assessment and comparison of the obtained coating. Theassessment of thickness and continuity of the obtained decorative layers based on metallographic examinations has been presented.

  1. The Bronze Age Smith as Individual

    DEFF Research Database (Denmark)

    Nørgaard, Heide Wrobel

    During 1550-1100 BC magnificent decorated bronze objects appear in grave and hoard finds in Northwest Europe. While investigating similarities in the decorative elements of bronze objects belonging to the female gender, it is possible to find traces of the production process. These distinctive fe...

  2. New Research on Bronze Age Textile Production

    DEFF Research Database (Denmark)

    Andersson, Eva Birgitta; Mårtensson, Linda; Nosch, Marie-Louise Bech;

    2008-01-01

    presentation of the results from the systematic tests with Bronze Age textile tools. results concerning mesurements of lenght and time consumed.......presentation of the results from the systematic tests with Bronze Age textile tools. results concerning mesurements of lenght and time consumed....

  3. Crystallography properties of solid solution of NaSr{sub 2}(NiNb{sub 4})O{sub 15-{delta}s}tructure of tetragonal tungsten bronze; Propriedades cristalograficas da solucao de NaSr{sub 2}(NiNb{sub 4})O{sub 15-{delta}} de estrutura tetragonal tungstenio bronze

    Energy Technology Data Exchange (ETDEWEB)

    Polini, C.; Dantas, S.A.; Mikaro, C.; Lima, A.R.F.; Nobre, M.A.L.; Lanfredi, S. [Universidade Estadual Paulista (LaCCeF/UNESP), Presidente Prudente, SP (Brazil). Dept. de Fisica, Quimica e Biologia. Lab. de Compositos e Ceramicas Funcionais

    2009-07-01

    In this work was investigated the crystallographic characterization of single phase and nanometric powders of sodium strontium niobate doped with nickel, with NaSr{sub 2}(NiNb{sub 4})O{sub 15-{delta}} stoichiometry, prepared by conventional route from mechanical mixture of oxides / carbonates using the high energy ball milling. The optimization of the parameters as time and calcination temperature for the preparation of the NaSr{sub 2}(NiNb{sub 4})O{sub 15-{delta}} solid solution were monitored by X-ray diffraction, using the Rietveld method. The NaSr{sub 2}(NiNb{sub 4})O{sub 15-{delta}} single phase powders with tetragonal tungsten bronze type structure were obtained with crystallite size at around 30 nm. From crystallographic parameters was constructed the unitary cellule of the NaSr{sub 2}(NiNb{sub 4})O{sub 15-{delta}} using the CaRIne Crystallography 3.1 program. The occupation of sites by the Na{sup +} and Sr{sup 2+} cations and the interatomic distances between nickel and niobium atoms were determined. Changes in structural parameters of sodium strontium niobate by addition of nickel are discussed. (author)

  4. Population genomics of Bronze Age Eurasia.

    Science.gov (United States)

    Allentoft, Morten E; Sikora, Martin; Sjögren, Karl-Göran; Rasmussen, Simon; Rasmussen, Morten; Stenderup, Jesper; Damgaard, Peter B; Schroeder, Hannes; Ahlström, Torbjörn; Vinner, Lasse; Malaspinas, Anna-Sapfo; Margaryan, Ashot; Higham, Tom; Chivall, David; Lynnerup, Niels; Harvig, Lise; Baron, Justyna; Della Casa, Philippe; Dąbrowski, Paweł; Duffy, Paul R; Ebel, Alexander V; Epimakhov, Andrey; Frei, Karin; Furmanek, Mirosław; Gralak, Tomasz; Gromov, Andrey; Gronkiewicz, Stanisław; Grupe, Gisela; Hajdu, Tamás; Jarysz, Radosław; Khartanovich, Valeri; Khokhlov, Alexandr; Kiss, Viktória; Kolář, Jan; Kriiska, Aivar; Lasak, Irena; Longhi, Cristina; McGlynn, George; Merkevicius, Algimantas; Merkyte, Inga; Metspalu, Mait; Mkrtchyan, Ruzan; Moiseyev, Vyacheslav; Paja, László; Pálfi, György; Pokutta, Dalia; Pospieszny, Łukasz; Price, T Douglas; Saag, Lehti; Sablin, Mikhail; Shishlina, Natalia; Smrčka, Václav; Soenov, Vasilii I; Szeverényi, Vajk; Tóth, Gusztáv; Trifanova, Synaru V; Varul, Liivi; Vicze, Magdolna; Yepiskoposyan, Levon; Zhitenev, Vladislav; Orlando, Ludovic; Sicheritz-Pontén, Thomas; Brunak, Søren; Nielsen, Rasmus; Kristiansen, Kristian; Willerslev, Eske

    2015-06-11

    The Bronze Age of Eurasia (around 3000-1000 BC) was a period of major cultural changes. However, there is debate about whether these changes resulted from the circulation of ideas or from human migrations, potentially also facilitating the spread of languages and certain phenotypic traits. We investigated this by using new, improved methods to sequence low-coverage genomes from 101 ancient humans from across Eurasia. We show that the Bronze Age was a highly dynamic period involving large-scale population migrations and replacements, responsible for shaping major parts of present-day demographic structure in both Europe and Asia. Our findings are consistent with the hypothesized spread of Indo-European languages during the Early Bronze Age. We also demonstrate that light skin pigmentation in Europeans was already present at high frequency in the Bronze Age, but not lactose tolerance, indicating a more recent onset of positive selection on lactose tolerance than previously thought. PMID:26062507

  5. The Bronze Age Smith as Individual

    OpenAIRE

    Nørgaard, Heide Wrobel

    2011-01-01

    During 1550-1100 BC magnificent decorated bronze objects appear in grave and hoard finds in Northwest Europe. While investigating similarities in the decorative elements of bronze objects belonging to the female gender, it is possible to find traces of the production process. These distinctive features can help to identify workshops and their sphere of influence. Sometimes these traces have the ability to give much more information than just indicate the crafting process of the object. Errors...

  6. Associação de Vibrio cholerae com o zooplâncton de águas estuárias da Baía de São Marcos/São Luis - MA, Brasil Association between Vibrio cholerae and zooplankton of estuaries of São Marcos Bay/São Luis - MA, Brazil

    OpenAIRE

    Eloisa da Graça do Rosario Gonçalves; Maria José Saraiva Lopes; Eurípedes Gomes de Oliveira; Ernesto Hofer

    2004-01-01

    Foi investigado, no período de outubro de 1997 a outubro de 1998, a possível associação de Vibrio cholerae com o zooplâncton dos estuários dos rios Anil e Bacanga, em São Luis - MA, Brasil, a presença da forma viável, mas não cultivável de Vibrio cholerae O1 e a correlação entre pH, salinidade e temperatura da água com a sobrevivência da bactéria. Amostras de zooplâncton foram coletadas em dois pontos fixos em cada estuário. O método clássico de isolamento e imunofluorescência direta foram em...

  7. Research on the Orientation of Decoration on Bronzes from Yinxu

    Institute of Scientific and Technical Information of China (English)

    岳洪彬

    2003-01-01

    The study of surface decoration is one important aspect of research on Yinxu 殷墟 bronzes and has been a particular focus of investigations of bronzes from the Three Dynasties. Previous scholars have already made great strides in this line of research and they have provided not only an important precedent for making chronological distinctions among the late Shang bronzes.

  8. “Neutron metallography” of archaeological bronzes

    Science.gov (United States)

    Siano, S.; Bartoli, L.; Kockelmann, W.; Zoppi, M.; Miccio, M.

    2004-07-01

    Following a first demonstration on the potentials of time-of-flight neutron diffraction in the microstructural characterisation of archaeological bronzes, we present here the results of a further systematic study on the topic. The experiments were performed on standardised specimens and original archaeological bronze findings at the powder diffractometer ROTAX. The possibility to achieve various metallographic data concerning alloy composition, homogeneity, dendritic structure, metal and mineral phases, as well as the effects of hardening, annealing, and re-crystallisation processes was successfully demonstrated. Furthermore, we also report a texture analysis on a Roman coin, which provided a clear striking fingerprint thus demonstrating a powerful authentication method.

  9. Canção do Amor Demais: marco da música popular brasileira contemporânea Canção do Amor Demais [Song of Too Much Love]: a milestone in contemporary Brazilian popular music

    Directory of Open Access Journals (Sweden)

    Liliana Harb Bollos

    2010-12-01

    Full Text Available Discussão sobre a importância do LP Canção do Amor Demais dentro do panorama da cultura brasileira, mais do que do âmbito da música popular em si, a partir do texto de Vinícius de Moraes na contracapa do disco e da crítica de José da Veiga Oliveira. A fronteira existente entre o popular e erudito fica menos evidente neste disco, por conta do alto grau composicional das canções e pelos arranjos assinados por Jobim, tendo em vista que ali se deu a apresentação de João Gilberto em disco e da batida do violão que iria simbolizar a Bossa Nova.This article discusses the importance of the LP Canção do Amor Demais (Song of Too Much Love within the panorama of Brazilian culture, much more than simply within the area of popular music itself. As the a starting point, this discussion uses the LP's liner notes by Vinícius de Moraes and the critique by José da Veiga Oliveira to demonstrate that the existing border between popular classical music become less evident with this album. This is due to the high compositional quality of the songs and arrangements by Tom Jobim, the introduction of João Gilberto and the guitar rhythms that would come to symbolize bossa nova.

  10. A abordagem cognitiva em pontos de inclusão digital em cidades da Bahia: marco teórico-metodológico Enfoque cognitivo en puntos de acceso a la inclusión digital en ciudades de Bahía: conceptos y método Cognitive Approach in the Digital Inclusion Point in Bahia's Towns: methodologic Theoretical Framework

    Directory of Open Access Journals (Sweden)

    Barbara Coelho Neves

    2009-12-01

    Full Text Available A presente comunicação visa relatar alguns progressos da pesquisa interessada em compreender o processo de mediação desenvolvido pelos pontos de inclusão digital (PIDs em cidades do estado da Bahia (Brasil. O objetivo é verificar se os modelos de acesso desenvolvidos nos PIDs, considerados como os de maior inclusão digital, favorecem a convergência de recursos (físicos, digitais, humanos e sociais. O marco teórico utilizado na investigação é apresentado, descrevendo os conceitos de tecnologia e de mediação pautada na cognição para contextualizar o objeto, centrando na compreensão da convergência de recursos cognitivos. A metodologia é descritiva, estando em desenvolvimento em 10 cidades.La presente comunicación detalla algunos de los avances de la investigación dedicada a comprender el proceso de mediación desarrollado por los puntos de inclusión digital (PIDs en ciudades del estado de Bahía (Brasil. El objetivo es verificar si los modelos de acceso desarrollados en los PIDs, considerados como los de mayor inclusión digital, favorecen la convergencia de recursos (físicos, digitales, humanos y sociales. Se presenta el marco teórico utilizado en la investigación para describir los conceptos de tecnología y de mediación pautada en la cognición, con el propósito de contextualizar el objeto, se enfoca en la comprensión de la convergencia de recursos cognitivos. El método es descriptivo, y se está aplicando en 10 ciudades.This work shows the progress of the research that intended to understand the mediation process developed by the access points of digital inclusion (PIDs in Bahia's towns (Brazil. It describes the first steps of the research, but progress is being made in concepts that allow us to understand the mediation process, focusing on the convergence of cognitive resources. The general purpose is to verify that the access models developed in Bahia's PIDs, which are considered of greater digital inclusion

  11. 75 FR 14257 - Pricing for Bronze Medals

    Science.gov (United States)

    2010-03-24

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF THE TREASURY United States Mint Pricing for Bronze Medals AGENCY: United States Mint, Department of the Treasury. ACTION: Notice. SUMMARY: The United States Mint is announcing the price of the 1\\5/16\\- inch...

  12. Copper and bronze coating with molybdenite

    International Nuclear Information System (INIS)

    The conditions were studied for producing qualitative bronze self-lubricating composite electrochemical coatings (SCEC). The copper composite coatings have been produced from sulfate electrolyte used for copper plating. The bronze SCEC have been obtained from a bath of the composition: tin dichloride-35, copper chloride-40, pyrophosphoric potassium-490. The problem of the optimal planning of Cu-MoS2 composite coatings characteristics has been considered. The matrix of the experiments planning is given, as well as the test results and numerical solution of coefficients of regression equations. The hardness of the bronze SCEC is affected most of all by the concentration and acidity of the suspension, and least of all - by the bath temperature. The friction coefficient of the self-lubricating coatings coupled with brass depends to a greater extent on the temperature and concentration of the suspension. The highest decrease of the friction coefficient can be expected at the minimum value of the abovesaid technological factors. The transient electric conductivity of the couple undergoing friction in air depends mainly on the cathode current density and concentration of dispersion phase in the electrolyte used for bronze plating. With the increase in the suspension concentration (and, therefore, in the amount of MoS2 inclusions into the coatings) the antifriction properties of the SCEC enhance. The dispersion addition increases the transient electric conductivity of the contact, however this does not prevent SCEC from being used in electrocommutation devices

  13. Population genomics of Bronze Age Eurasia

    DEFF Research Database (Denmark)

    Allentoft, Morten E.; Sikora, Martin; Sjögren, Karl-Göran;

    2015-01-01

    The Bronze Age of Eurasia (around 3000-1000 BC) was a period of major cultural changes. However, there is debate about whether these changes resulted from the circulation of ideas or from human migrations, potentially also facilitating the spread of languages and certain phenotypic traits. We inv...... a more recent onset of positive selection on lactose tolerance than previously thought....

  14. The Chalcolithic and the Bronze Age in the river Neiva Basin, NW of Portugal

    OpenAIRE

    Magalhães, Marisa Cardoso

    2016-01-01

    Relatório de estágio de mestrado em Arqueologia O presente relatório deseja expor os resultados da investigação sobre o Calcolítico e a Idade do Bronze da bacia do Neiva, desenvolvida durante o segundo ano de Mestrado em Arqueologia na Universidade do Minho. Relativamente a estes períodos cronológicos podemos destacar a diversidade de estratégias de povoamento, com tendências para ocupações de locais de menor altitude e mais próximas de vales. Estas comunidades que se estabelec...

  15. As estratégias de cooperação Sul-Sul nos marcos da política externa brasileira de 1993 a 2007 South-South cooperation strategies in Brazilian Foreign Policy from 1993 to 2007

    Directory of Open Access Journals (Sweden)

    Miriam Gomes Saraiva

    2007-12-01

    Full Text Available O objetivo do artigo é analisar as duas vertentes da cooperação sul-sul adotadas pela política externa brasileira entre 1993 e 2007. Por um lado, o artigo examina a política externa brasileira em face da América do Sul: o Mercosul e a cooperação sul-americana em termos mais gerais que, dentro do arco das atuações externas do país, é o tipo de cooperação sul-sul identificada como prioritária. Por outro lado, dedicará também algumas reflexões para a cooperação do Brasil com outros países considerados emergentes e system-affecting, em outros continentes, como é o caso da África do Sul, Índia, China e, em diferente medida, da Rússia.The aim of this article is to analyze the two approaches to South-South cooperation evident in Brazilian foreign policy between 1993 and 2007. On one hand the article examines Brazilian foreign policy towards South America. Specifically, cooperation with Mercosur members and South-American cooperation broadly conceptualized. The region is a foreign policy priority among its south-south cooperation activities. On the other hand, this paper reflects on Brazilian cooperation with other emerging and "system-affecting" countries that belong to other continents, such as South Africa, India and China, and to a certain extent, Russia.

  16. Morphometrics and Theriology. Homage to Marco Corti

    Directory of Open Access Journals (Sweden)

    Anna Loy

    2008-02-01

    Full Text Available Abstract This paper discusses the role of museum theriological collections in the context of twenty years of morphometric progresses. It also recalls twenty years of collaboration and friendship with Marco Corti, Italian theriologist and morphometrician, died on January 2007. The synthesis is addressed to the many young students that are picking up the baton and will likely contribute to the growth of the Italian school of morphometrics, to which Marco Corti dedicated most of his work at the University of Rome "La Sapienza". Riassunto Morfometria e teriologia. Omaggio a Marco Corti. Il lavoro discute il ruolo delle collezioni teriologiche alla luce di venti anni di progressi della morfometria. Esso rappresenta anche la sintesi di un’esperienza umana e professionale, avendo l’autore condiviso molte tappe della ‘rivoluzione morfometrica’ degli anni ottanta con molti dei suoi protagonisti, alcuni dei quali oggi non sono più con noi. In particolare Marco Corti, teriologo e morfometrista, scomparso nel 2007. La sintesi è anche dedicata ai molti giovani studenti e ricercatori che stanno contribuendo alla crescita della scuola italiana di morfometria, cui Marco Corti ha dedicato gli ultimi venti anni di insegnamento e ricerca all’Università di Roma "La Sapienza".

  17. Marcos normativos da anticoncepção de emergência e as dificuldades de sua institucionalização nos serviços públicos de saúde Legal framework of emergency contraception and the difficulties of its institutionalization in public health services

    Directory of Open Access Journals (Sweden)

    Rozana Aparecida de Souza

    2009-01-01

    Full Text Available Este artigo discute as dificuldades de implementação da Anticoncepção de Emergência (AE nas práticas do Sistema Único de Saúde, no período de 2000 a 2008, mediante revisão crítica da literatura sobre o tema e análise de documentos oficiais. Aponta avanços no âmbito da legislação em saúde para a utilização da AE, os quais permitem oficialmente reconhecê-la no país como alternativa contraceptiva em situações emergenciais, para além dos casos de violência sexual. O levantamento da literatura nacional e internacional, centrada na América Latina e em alguns estudos da Europa, dos EUA e do Canadá, suscita questões referentes à não-incorporação dessas normas nas práticas cotidianas dos serviços de saúde, revelando representações sociais difíceis de serem revertidas em pouco tempo. Documentos oficiais do MS e do CFM foram analisados para construção do marco legal e político-institucional que pauta a discussão. Os resultados mostram paradoxos entre as normas asseguradas e as práticas existentes nos serviços de saúde: dificuldade no acesso e utilização da AE via serviços públicos de saúde; a pílula do dia seguinte (PDS é comumente considerada abortiva por profissionais de saúde, usuárias e seus parceiros; embora pesquisas apontem aumento significativo do uso desse método, há resistência dos serviços a disponibilizá-lo; persiste a ideia recorrente no senso comum de que a AE levaria os usuários, principalmente adolescentes, a abandonar outros métodos contraceptivos de uso regular, inclusive preservativo, fato não confirmado pelos estudos realizados, pois eles indicam que os adolescentes que recorrem à AE são os que usam tal método.This paper discusses the difficulties to implement emergency contraception (EC in Brazilian Public Health Service, from 2000 to 2008, based on critical literature review and analysis of official documents on the theme. It shows advancements in health legislation

  18. Thermal and Electrical Conductivity Measurements of CDA 510 Phosphor Bronze

    Science.gov (United States)

    Tuttle, James E.; Canavan, Edgar; DiPirro, Michael

    2009-01-01

    Many cryogenic systems use electrical cables containing phosphor bronze wire. While phosphor bronze's electrical and thermal conductivity values have been published, there is significant variation among different phosphor bronze formulations. The James Webb Space Telescope (JWST) will use several phosphor bronze wire harnesses containing a specific formulation (CDA 510, annealed temper). The heat conducted into the JWST instrument stage is dominated by these harnesses, and approximately half of the harness conductance is due to the phosphor bronze wires. Since the JWST radiators are expected to just keep the instruments at their operating temperature with limited cooling margin, it is important to know the thermal conductivity of the actual alloy being used. We describe an experiment which measured the electrical and thermal conductivity of this material between 4 and 295 Kelvin.

  19. 77 FR 14600 - Pricing for 2012 Kennedy Half-Dollar Bags and Rolls, Bronze Medals, the First Spouse Bronze Medal...

    Science.gov (United States)

    2012-03-12

    ... United States Mint Pricing for 2012 Kennedy Half-Dollar Bags and Rolls, Bronze Medals, the First Spouse.... SUMMARY: The United States Mint is announcing 2012 pricing for Kennedy Half-Dollar bags and rolls, bronze..., Associate Director for Sales and Marketing; United States Mint; 801 9th Street NW., Washington, DC 20220;...

  20. Gold and Silver Inlaid Bronze Sheep

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    Gold and silver inlaying is a metal processing technique popular during the Spring and Autumn Period (770-476 B. C.) and the Warring States Period (475-221 B. C.). Patterns on the surface of the bronze figure are chiselled out and gold and silver threads (which can be as thin as hair) are inlaid. Finally the whole figure is filed and polished resulting in a splendid artistic work highlighting the different colours of the three different kinds of metal. The artifact shown here was unearthed from Ningxia'...

  1. Marco Polo Dances Back to China

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    The national theater’s first dance drama premieres in late December The first original dance drama of China’s National Center for the Performing Arts (NCPA) Marco Polo will debut at the theater on December 22, a move to continue the tradition of launching excellent stage works to celebrate the theater’s anniversary.This December marks the theater’s third birthday.

  2. Atomically resolved images of lithium purple bronze

    Energy Technology Data Exchange (ETDEWEB)

    Klinke, Melanie; Bienert, Robert; Waelsch, Michael; Podlich, Tatjana; Matzdorf, Rene [Experimentalphysik II, Universitaet Kassel (Germany); Jin, Rongying [Department of Physics and Astronomy, Lousiana State University (United States)

    2012-07-01

    The lithium molybdenum purple bronze Li{sub 0.9}Mo{sub 6}O{sub 17} is a quasi 1D metal at room temperature showing Luttinger liquid physics. The highly anisotropic conductivity runs along the crystallographic b axis where Mo-O chains, formed by the shared edges of the MoO{sub 6} octahedra, provide the electrical transport. Li{sub 0.9}Mo{sub 6}O{sub 17} samples were investigated with low-temperature scanning tunneling microscopy and spectroscopy. By cleaving the samples at low temperatures (60 K) we obtained atomically resolved images of the surface. In these images the Mo-O chains are visible, which are covered by layers of MoO{sub 6} octahedra and MoO{sub 4} tetrahedra.

  3. Russian meteorite Bronze Age (rock record)

    CERN Document Server

    Vodolazhskaya, Larisa

    2013-01-01

    This paper presents the results of a study of petroglyphs found in the quartzite grotto near the Skelnovsky small village in the Northern Black Sea in the South of Russia. The aim of the study was the analysis and interpretation of the Early Bronze Age petroglyphs using archaeoastronomical methods. The article presents a comparative analysis of Skelnovsky grotto ancient images and contemporary eyewitness accounts of the Sikhote-Alin meteorite fall and meteorite shower. Some petroglyphs were interpreted by us using ethnographic and folklore material. In this study, the magnetic declination for the geographical coordinates Skelnovsky farm was calculated, and the projection of the whole picture Skelnovskih petroglyphs on the topographical map of the area was built. The proposed location of the meteorite fall was determined with this projection. It is confirmed by satellite pictures, on which are the distinguishable terrain features, typical for the meteorite fall, are visible including the possible impact crater...

  4. Stamps of New China Eastern Zhou Dynasty Bronzes

    Institute of Scientific and Technical Information of China (English)

    2004-01-01

    The State Postal Bureau’s latest set of special stamps for 2003 features Eastern Zhou Dynasty (770-256 B,C.) bronzes. This eight-stamp set is the third to feature this type of relic; a set issued in 1964 depicted bronzes from the Yin Dynasty (14th-11th century}, and one featuring Western Zhou Dynasty (11th century-771 B.C.) bronzes was released in 1982.The Eastern Zhou Dynasty followed the Western, and during this period, bronze vessel casting developed remarkably. Artifacts from this period include sacrificial vessels, musical instruments, utensils, weapons and tools.One of these pieces, a rectangular tray decorated with tortoise and fish patterns, dates back to the late Spring and Autumn Period

  5. Reversibility of the lithium-vanadium bronze structure when cycled

    International Nuclear Information System (INIS)

    The positive electrodes of the lithium secondary current sources, manufactured on the basis of the Li1+x V3O8 lithium-vanadium bronze, obtained through the alcoxotechnology, are studied. It is established, that in proportion to the lithium introduction the initial crystalline bronze renders amorphous, remaining a single-phase one. Increase in the x-lithifying rate leads practically to decrease in the α-parameters and increase in the b- and c-parameters of the bronze crystal lattice, whereby these changes are quite reversible by cycling. The obvious degradation of the electrode electrical parameters is not connected with irreversible structural changes and may be explained by formation of passive films on the surface of the particles of the lithium-vanadium bronze

  6. Marcos interpretativos para acercarnos al proceso de emergencia del problema de las violencias hacia las mujeres en Colombia

    Directory of Open Access Journals (Sweden)

    Laura Badillo

    2015-01-01

    Full Text Available El artículo da cuenta de los marcos interpretativos adoptados por lasinstituciones, personas y organizaciones respecto a las políticas públicascontra las violencias hacia las mujeres. Primeramente se hace unaaproximación teórica a la noción de marcos interpretativos, seguidamente seexpone el análisis a partir de la variable de permanencia, y finalmente seaborda estos enmarques en el contexto de Colombia, especialmente la violenciaen el ámbito de la familia.

  7. 75 FR 57825 - Culturally Significant Objects Imported for Exhibition Determinations: “Ancient Chinese Bronzes...

    Science.gov (United States)

    2010-09-22

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF STATE Culturally Significant Objects Imported for Exhibition Determinations: ``Ancient Chinese Bronzes From the... objects to be included in the exhibition ``Ancient Chinese Bronzes from the Shouyang Studio: The...

  8. Electrochemical testing of laser treated bronze surface

    Energy Technology Data Exchange (ETDEWEB)

    Yilbas, B.S., E-mail: bsyilbas@kfupm.edu.sa [Dept. of Mechanical Engineering, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran 31261 (Saudi Arabia); Toor, Ihsan-ul-Haq; Malik, Jahanzaib; Patel, F. [Dept. of Mechanical Engineering, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran 31261 (Saudi Arabia); Karatas, C. [Engineering Faculty, Hacettepe University, Ankara (Turkey)

    2013-06-25

    Highlights: ► Laser treated surface is free from asperities. ► Laser treated layer extends uniformly below the surface with a thickness in the order of 40 μm. ► Presence of Cu{sub 3}N nitrides is evident from X-ray diffractogram. ► Dendritic structure is formed below the surface due to relatively slower cooling rates as compared to that at the surface. ► The corrosion current density for the laser treated surface is much less than that of the as-received surface. -- Abstract: Electrochemical testing of laser treated bronze surface is carried out and corrosion resistance of the surface is assessed. Morphological and metallurgical changes in the laser treated layer are examined using scanning electron microscope, energy dispersive spectroscopy, and X-ray diffraction. The pit sites formed at the surface are analyzed using scanning electron microscope. It is found that laser treatment improves the corrosion resistance of the treated surface. Fine grains are formed in the surface region of the laser treated layer, which are attributed to the large cooling rates from the surface.

  9. Study of patina formation on bronze specimens

    International Nuclear Information System (INIS)

    In this study, bronze samples (94.059% Cu; 0.023% Zn; 0.077% Pb and 5.801% Sn, w/w) were exposed for 8 months to a marine atmosphere (splash zone) at Barra of Tijuca Beach, Rio de Janeiro. X-ray diffraction analysis (XRD) was used to identify the composition of the corrosion products formed on the samples. The electrochemical properties were analyzed using potential and electrochemical impedance measurements. These analyses and measurements were obtained from periodically removed samples, and compared to those exposed to laboratory tests (total and alternating immersion) in 10-2 mol L-1 NaCl solution. The corrosion potential results, allied to XRD analysis, showed that the chemical nature of the films obtained on the surface of the field test samples was very similar to that obtained in the alternating immersion test. The main products identified were cuprite and atacamite. However, the film formed during the total immersion (TI) test was primarily composed of cuprite with nantokite traces, which was not observed in either the field or in alternating tests. The electrochemical impedance measurements obtained in laboratory and field test samples showed the formation of films with a porous structure. The thermodynamic evaluation was also consistent with the corrosion products formed.

  10. Evaluation of Bio-field Treatment on Physical and Structural Properties of Bronze Powder

    OpenAIRE

    Mahendra Kumar Trivedi; Gopal Nayak; Rama Mohan Tallapragada

    2015-01-01

    Bronze, a copper-tin alloy, widely utilizing in manufacturing of gears, bearing, and packing technologies due to its versatile physical, mechanical, and chemical properties. The aim of the present work was to evaluate the effect of bio-field treatment on physical and structural properties of bronze powder. Bronze powder was divided into two samples, one served as control and the other sample was received bio-field treatment. Control and treated bronze samples were characterized using x-ray di...

  11. Evaluation of Biofield Treatment on Physical and Structural Properties of Bronze Powder

    OpenAIRE

    Trivedi, Mahendra; Nayak, Gopal

    2015-01-01

    Bronze, a copper-tin alloy, widely utilizing in manufacturing of gears, bearing, and packing technologies due to its versatile physical, mechanical, and chemical properties. The aim of the present work was to evaluate the effect of biofield treatment on physical and structural properties of bronze powder. Bronze powder was divided into two samples, one served as control and the other sample was received biofield treatment. Control and treated bronze samples were characterized using x-ray diff...

  12. Prompt gamma-ray analysis of archaeological bronze

    International Nuclear Information System (INIS)

    Prompt γ-ray analysis using the internal monostandard method was applied to voluminous archaeological bronze mirrors produced in ancient China. Sn/Cu content ratios were determined nondestructively by this method. Furthermore, Au/Cu, As/Cu, and Sb/Cu content ratios were determined by means of measuring decay γ-rays emitted from radioactive nuclides produced within samples via (n,γ) reactions. It is clear that the Sn/Cu content ratios in bronze mirrors produced in the Sung era is smaller than in ones produced in between the Han and the Tung era. (author)

  13. The Early Bronze Age Dwellings in the Southern Levant

    Directory of Open Access Journals (Sweden)

    Deborah Sebag

    2007-10-01

    Full Text Available The house is a strategic base for the study of any given civilization. By studying the habitations, it is possible to find indications of not only the way of life of its occupants, their social organization, their world view, their needs, their resources but also of the available technologies. In this study, we will give a chronological presentation of the various types of dwellings through the Early Bronze age, in the Southern Levant. It is during the Early Bronze Age (3 100-2 000 B.C., t...

  14. Archaeological investigations of the Bronze Age village of Bagnara di Romagna (RA

    Directory of Open Access Journals (Sweden)

    Maurizio Cattani

    2014-12-01

    Full Text Available This paper summarizes the results of researches carried out in the area next to the modern village of Bagnara di Romagna (RA, where several evidences related to a Bronze Age settlement have been collected. Recently test trenches and surface collections allowed to retrieve bronze and ceramics dating from the Middle Bronze Age (phase BM2 to the Recent Bronze Age (phase BR2. The analysis of landscape and the palaeoenvironmental reconstruction complete the outline of the region of Imola, Faenza and Lugo during the Bronze Age where are well known the ancient settlements of Solarolo, via Ordiere, Monte Castellaccio end S. Giuliano di Toscanella.

  15. Origin of the mysterious Yin-Shang bronzes in China indicated by lead isotopes

    Science.gov (United States)

    Sun, Wei-dong; Zhang, Li-peng; Guo, Jia; Li, Cong-ying; Jiang, Yu-hang; Zartman, Robert E.; Zhang, Zhao-feng

    2016-01-01

    Fine Yin-Shang bronzes containing lead with puzzlingly highly radiogenic isotopic compositions appeared suddenly in the alluvial plain of the Yellow River around 1400 BC. The Tongkuangyu copper deposit in central China is known to have lead isotopic compositions even more radiogenic and scattered than those of the Yin-Shang bronzes. Most of the Yin-Shang bronzes are tin-copper alloys with high lead contents. The low lead and tin concentrations, together with the less radiogenic lead isotopes of bronzes in an ancient smelting site nearby, however, exclude Tongkuangyu as the sole supplier of the Yin-Shang bronzes. Interestingly, tin ingots/prills and bronzes found in Africa also have highly radiogenic lead isotopes, but it remains mysterious as to how such African bronzes may have been transported to China. Nevertheless, these African bronzes are the only bronzes outside China so far reported that have lead isotopes similar to those of the Yin-Shang bronzes. All these radiogenic lead isotopes plot along ~2.0–2.5 Ga isochron lines, implying that deposits around Archean cratons are the most likely candidates for the sources. African cratons along the Nile and even micro-cratons in the Sahara desert may have similar lead signatures. These places were probably accessible by ancient civilizations, and thus are the most favorable suppliers of the bronzes. PMID:26988425

  16. Origin of the mysterious Yin-Shang bronzes in China indicated by lead isotopes

    Science.gov (United States)

    Sun, Wei-Dong; Zhang, Li-Peng; Guo, Jia; Li, Cong-Ying; Jiang, Yu-Hang; Zartman, Robert E.; Zhang, Zhao-Feng

    2016-03-01

    Fine Yin-Shang bronzes containing lead with puzzlingly highly radiogenic isotopic compositions appeared suddenly in the alluvial plain of the Yellow River around 1400 BC. The Tongkuangyu copper deposit in central China is known to have lead isotopic compositions even more radiogenic and scattered than those of the Yin-Shang bronzes. Most of the Yin-Shang bronzes are tin-copper alloys with high lead contents. The low lead and tin concentrations, together with the less radiogenic lead isotopes of bronzes in an ancient smelting site nearby, however, exclude Tongkuangyu as the sole supplier of the Yin-Shang bronzes. Interestingly, tin ingots/prills and bronzes found in Africa also have highly radiogenic lead isotopes, but it remains mysterious as to how such African bronzes may have been transported to China. Nevertheless, these African bronzes are the only bronzes outside China so far reported that have lead isotopes similar to those of the Yin-Shang bronzes. All these radiogenic lead isotopes plot along ~2.0–2.5 Ga isochron lines, implying that deposits around Archean cratons are the most likely candidates for the sources. African cratons along the Nile and even micro-cratons in the Sahara desert may have similar lead signatures. These places were probably accessible by ancient civilizations, and thus are the most favorable suppliers of the bronzes.

  17. Trajetória da política de atenção básica à saúde no Distrito Federal, Brasil (1960 a 2007: análise a partir do marco teórico do neo-institucionalismo histórico A history of primary health care policy in the Federal District, Brazil (1960-2007: an analysis based on the theoretical framework of historical neo-institutionalism

    Directory of Open Access Journals (Sweden)

    Leila Bernardo Donato Göttems

    2009-06-01

    Full Text Available Este artigo analisa a trajetória da política de atenção básica à saúde no Distrito Federal, Brasil, a partir do marco teórico do neo-institucionalismo histórico, identificando as conformações e as tendências predominantes nas gestões da Secretaria de Estado da Saúde (SES-DF no período de 1960 a 2007. O estudo sinaliza que a política de saúde do Distrito Federal apresenta características de dependência da trajetória dos planos de saúde originais na definição de prioridades e metas, bem como na implementação do sistema de saúde. Essa influência, agregada à centralização dos processos decisórios e à limitada participação política, pode contribuir para situar a atenção básica como acessória ao atendimento hospitalar, destituindo-a do seu potencial de produzir mudança no modelo assistencial.This article analyzes the history of primary health care policy in the Federal District, Brazil, based on the theoretical framework of historical neo-institutionalism, identifying the predominant configurations and trends in the various administrations of the State Health Secretariat (SES-DF from 1960 to 2007. The study indicates that the characteristics of the Federal District's health policy are dependent on the history of the original health system plans for setting priorities and goals, as well as for the health system's implementation. This influence, in addition to the centralization of decision-making processes and limited political participation, can contribute to making primary care ancillary to hospital care, thus jeopardizing its potential to produce change in the health care model.

  18. Pantani di Marco Martinelli: una narrazione polifonica

    Directory of Open Access Journals (Sweden)

    Franco Nasi

    2014-05-01

    Full Text Available In questo articolo si analizza il testo drammaturgico Pantani di Marco Martinelli, una veglia epica teatrale di uno dei più noti eroi dello sport italiano degli ultimi anni. Il dramma rilegge anche la storia di Pantani e ricostruisce gli strani avvenimenti che portarono alla sospensione, alla estromissione del ciclista dal Giro d’Italia nel 1999, e in seguito alla sua profonda crisi psicologica e tragica morte in solitudine in un hotel, a soli 34 anni. Oltre alle modalità proprie della veglia rituale, il dramma utilizza anche i metodi del processo giudiziario, e offre testimonianze dettagliate che conducono a una riflessione critica sulla società italiana negli anni del potere politico di Berlusconi e della sua filosofia del consumismo. I tre diversi generi della retorica classica (epidittico, giudiziario e deliberativo si mescolano in questa complessa tessitura teatrale. Coniugando informazioni (processo e rito (veglia, Martinelli riesce a fondere la tragedia greca (forma mimetica e corale e il moderno teatro di narrazione (forma diegetica monologante. Combinando assieme scene intensamente drammatiche, ricordi di imprese sportive epiche, passaggi giocosi e parodici, e giustapponendo vari stili e registri (giornalistico, lirico, parodico, elegiaco, Martinelli crea momenti di forte “straniamento” e sorpresa, e rende particolarmente efficace il rito funebre, la ricostruzione storica della tragica vicenda di Pantani e la critica all’ideologia che ha dominato l’Italia negli anni di Berlusconi. 

  19. Reporting Casting Bronze Plaque Becomes Advisers Class Project

    Science.gov (United States)

    Ross, Charlie

    1977-01-01

    Describes an advisers' class project (at the University of Oklahoma) which consisted of reporting on the casting of a bronze plaque bearing the names of the first school newspaper, "The Students Gazette," and its editor, Samuel M. Fox, for presentation in Philadelphia to commemorate scholastic journalism's Bicentennial. (MB)

  20. Panetta Awarded Bronze Star for Afghanistan Intel Mission

    OpenAIRE

    Naval Postgraduate School Public Affairs Office

    2008-01-01

    Fellow officers in full dress uniform, family and friends ringed the room in rapt attention as Naval Reserve Lt. James Panetta was awarded the Bronze Star Medal by Naval Postgraduate School President Daniel Oliver in a special ceremony in the President's Conference Room, Dec. 9.

  1. Corrosion behavior of leaded-bronze alloys in sea water

    Energy Technology Data Exchange (ETDEWEB)

    Zohdy, K.M., E-mail: khalzohdy@yahoo.com [Higher Technological Institute, 10" t" h of Ramadan City (Egypt); Sadawy, M.M. [Mining and Petroleum Engineering Department, Al-Azhar University, Nasr City, Cairo 11371 (Egypt); Ghanem, M. [Industrial Education, Suez University (Egypt)

    2014-10-15

    The corrosion behavior of leaded-bronze alloys (Cu–5Sn–5Zn–5Pb, Cu–8Sn–8Zn–8Pb and Cu–10Sn–10Zn–10Pb) in sea water was investigated using weight loss method, open-circuit potential measurements (OCP), polarization techniques and electrochemical impedance spectroscopy (EIS). The nature and morphology of the corrosion products were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that the corrosion resistance decreases with decreasing copper content. The XRD indicated that the composition of patina depends on the concentration of Cu, Sn, Zn and Pb in each alloy. - Highlights: • The corrosion potential of leaded bronze shifts to more noble potential. • The corrosion resistance increases with increasing amount of copper content in leaded bronze alloys. • The patina formed on Cu–5Sn–5Zn–5Pb is more uniform and protective than other alloys. • The composition of patina formed on leaded bronze depends on the concentration of Cu, Sn, Zn and Pb in the alloy.

  2. Electrodeposited nanocrystalline bronze alloys as replacement for Ni

    NARCIS (Netherlands)

    Hovestad, A.; Tacken, R.A.; Mannetje, H.H.'t

    2008-01-01

    Nanocrystalline white-bronze, CuSn, electroplating was investigated as alternative to Ni plating as undercoat for noble metals in jewellery applications. A strongly acidic plating bath was developed with an organic additive to suppress hydrogen evolution and obtain bright coatings. Polarization curv

  3. The Marcos de Niza Experience: Teaching in a Community Setting.

    Science.gov (United States)

    Auerbach, Julieta Aviles

    1979-01-01

    The author reports on the multicultural, bilingual art program she created for elementary-age children at the Marcos de Niza community center in Phoenix, Arizona. This article is part of a theme issue on multicultural art education. (SJL)

  4. Kas doktorikooli lõpetajatest saavad doktorid? / Marco Kirm

    Index Scriptorium Estoniae

    Kirm, Marco, 1965-

    2008-01-01

    Materjaliteaduse ja materjalide tehnoloogia doktorikool on TÜ Füüsika-keemiateaduskonna ja Füüsika Instituudi juurde loodud institutsioon. Vastab Tartu Ülikooli Füüsika Instituudi teadusdirektor Marco Kirm

  5. The study of bronze statuettes with the help of neutron-imaging techniques

    OpenAIRE

    Van Langh, R.; Lehmann, E; Hartmann, S.; Kaestner, A.; Scholten, F.

    2009-01-01

    Until recently fabrication techniques of Renaissance bronzes have been studied only with the naked eye, microscopically, videoscopically and with X-radiography. These techniques provide information on production techniques, yet much important detail remains unclear. As part of an interdisciplinary study of Renaissance bronzes undertaken by the Rijksmuseum Amsterdam, neutron-imaging techniques have been applied with the aim of obtaining a better understanding of bronze workmanship during the R...

  6. Characterization of bronzes by abrasive stripping voltammetry and thin layer chromatography

    OpenAIRE

    Komorsky-Lovrić, Šebojka; Horvat, Alka J.M.; Ivanković, Danijela

    2006-01-01

    Corrosion potentials of five samples of bronzes having different compositions and the stripping peak potentials of their main components were determined by abrasive stripping voltammetry. Using thin-layer chromatography in combination with electrochemical dissolution of bronzes in the two electrode sampler, the ions of tin, copper, lead and nickel were detected as the products of electro-oxidation of bronzes. It is shown that the dissolution of tin is preferential at low potential differences...

  7. Rewriting the Central European Early Bronze Age Chronology: Evidence from Large-Scale Radiocarbon Dating.

    Directory of Open Access Journals (Sweden)

    Philipp W Stockhammer

    Full Text Available The transition from the Neolithic to the Early Bronze Age in Central Europe has often been considered as a supra-regional uniform process, which led to the growing mastery of the new bronze technology. Since the 1920s, archaeologists have divided the Early Bronze Age into two chronological phases (Bronze A1 and A2, which were also seen as stages of technical progress. On the basis of the early radiocarbon dates from the cemetery of Singen, southern Germany, the beginning of the Early Bronze Age in Central Europe was originally dated around 2300/2200 BC and the transition to more complex casting techniques (i.e., Bronze A2 around 2000 BC. On the basis of 140 newly radiocarbon dated human remains from Final Neolithic, Early and Middle Bronze Age cemeteries south of Augsburg (Bavaria and a re-dating of ten graves from the cemetery of Singen, we propose a significantly different dating range, which forces us to re-think the traditional relative and absolute chronologies as well as the narrative of technical development. We are now able to date the beginning of the Early Bronze Age to around 2150 BC and its end to around 1700 BC. Moreover, there is no transition between Bronze (Bz A1 and Bronze (Bz A2, but a complete overlap between the type objects of the two phases from 1900-1700 BC. We thus present a revised chronology of the assumed diagnostic type objects of the Early Bronze Age and recommend a radiocarbon-based view on the development of the material culture. Finally, we propose that the traditional phases Bz A1 and Bz A2 do not represent a chronological sequence, but regionally different social phenomena connected to the willingness of local actors to appropriate the new bronze technology.

  8. Quantitative multiphase analysis of archaeological bronzes by neutron diffraction

    CERN Document Server

    Siano, S; Celli, M; Pini, R; Salimbeni, R; Zoppi, M; Kockelmann, W A; Iozzo, M; Miccio, M; Moze, O

    2002-01-01

    In this paper, we report the first investigation on the potentials of neutron diffraction to characterize archaeological bronze artifacts. The preliminary feasibility of phase and structural analysis was demonstrated on standardised specimens with a typical bronze alloy composition. These were realised through different hardening and annealing cycles, simulating possible ancient working techniques. The Bragg peak widths that resulted were strictly dependent on the working treatment, thus providing an important analytical element to investigate ancient making techniques. The diagnostic criteria developed on the standardised specimens were then applied to study two Etruscan museum pieces. Quantitative multiphase analysis by Rietveld refinement of the diffraction patterns was successfully demonstrated. Furthermore, the analysis of patterns associated with different artifact elements also yielded evidence for some peculiar perspective of the neutron diffraction diagnostics in archeometric applications. (orig.)

  9. Friction stir processing / welding of NiAl bronzes

    OpenAIRE

    McNelley, Terry; Menon, Sarath

    2016-01-01

    Research Project Friction stir processing (FSP) of as-cast NiAl bronzes converts the as-cast microstructure to a wrought condition in the volume of materials subjected to the process. This results in improved properties in the absence of component shape change. With the development of portable systems, friction stir processing may enable in situ repair of defective components such as propellers and thus avoid expensive procedures such as dry docking for such repairs.

  10. NUMERICAL MODELING OF HARDENING OF UNINTERRUPTEDLY-CASTED BRONZE CASTING

    Directory of Open Access Journals (Sweden)

    E. I. Marukovich

    2009-01-01

    Full Text Available The three-dimensional numerical model for calculation of thermal fields during solidification of continuously casted bronze casting is developed. Coefficients of heat transfer on borders of calculation areas on the basis of the solution of inverse heat transfer conduction problem are determined. The analysis of thermal fields, depending on loop variables of drawing and the sizes of not cooled zone of crystallizer is curried out.

  11. Prevention of Dealloying in Manganese Aluminium Bronze Propeller: Part II

    OpenAIRE

    Napachat Tareelap; Kaysinee Sriraksasin; Nakorn Srisukhumbowornchai; Swieng Thuanboon; Choochat Nitipanyawong

    2014-01-01

    Due to the failure of manganese aluminium bronze (MAB) propeller caused by dealloying corrosion as described in Part I [1], this work aims to study the prevention of dealloying corrosion using aluminium and zinc sacrificial anodes. The results indicated that both of the sacrificial anodes could prevent the propeller from dealloying. Moreover, the dealloying in seawater was less than that found in brackish water. It was possible that hydroxide ions, from cathodic reaction, reacted with calcium...

  12. The Development of Iron Technology in the Mediterranean Bronze Age

    OpenAIRE

    Leek, Rodney Thomas

    2014-01-01

    In the eastern Mediterranean region in the Bronze Age there were a number of elite controlled, complex societies that through cultural activities and trade and international agreements, participated in a regional exchange economy. In the transition to Iron Age there was a confusing period with wars, migrations and the collapse of most of the elite societies,. At this time, iron technology had already spread to some parts of the region. When the regional economy collapsed in c. 1200 BC it crea...

  13. Tamil Chola Bronzes and Swamimalai Legacy: Metal Sources and Archaeotechnology

    Science.gov (United States)

    Srinivasan, Sharada

    2016-05-01

    This review explores the great copper alloy image casting traditions of southern India from archaeometallurgical and ethnometallurgical perspectives. The usefulness of lead isotope ratio and compositional analysis in the finger-printing and art historical study of more than 130 early historic, Pallava, Chola, later Chola, and Vijayanagara sculptures (fifth-eighteenth centuries) is highlighted, including Nataraja, Buddha, Parvati, and Rama images made of copper, leaded bronze, brass, and gilt copper. Image casting traditions at Swamimalai in Tamil Nadu are compared with artistic treatises and with the technical examination of medieval bronzes, throwing light on continuities and changes in foundry practices. Western Indian sources could be pinpointed for a couple of medieval images from lead isotope analysis. Slag and archaeometallurgical investigations suggest the exploitation of some copper and lead-silver sources in the Andhra and Karnataka regions in the early historic Satavahana period and point to probable copper sources for the medieval images in Karnataka, Tamil Nadu, and Andhra Pradesh. The general lower iron content in southern Indian bronzes perhaps renders the proximal copper-magnetite reserves of Seruvila in Sri Lanka as a less likely source. Given the lack of lead deposits in Sri Lanka, however, the match of the lead isotope signatures of a well-known Ceylonese Buddhist Tara in British Museum with a Buddha image from Nagapattinam in Tamil Nadu may underscore ties between the island nation and the southern Indian Tamil regions.

  14. Matisse to Picasso: a compositional study of modern bronze sculptures.

    Science.gov (United States)

    Young, Marcus L; Schnepp, Suzanne; Casadio, Francesca; Lins, Andrew; Meighan, Melissa; Lambert, Joseph B; Dunand, David C

    2009-09-01

    Inductively coupled plasma-optical emission spectroscopy (ICP-OES) was used to determine the bulk metal elemental composition of 62 modern bronze sculptures cast in Paris in the first half of the twentieth century from the collections of The Art Institute of Chicago and the Philadelphia Museum of Art. As a result, a comprehensive survey of the alloy composition of the sculptures of many prominent European artists of the early twentieth century is presented here for the first time. The sculptures in this study consist of predominantly copper with two main alloying elements (zinc and tin). By plotting the concentrations of these two elements (zinc and tin) against each other for all the sculptures studied, three clusters of data become apparent: (A) high-zinc brass; (B) low-zinc brass; (C) tin bronze. These clusters correlate to specific foundries, which used specific casting methods (sand or lost wax) that were influenced by individual preferences and technical skills of the foundry masters. For instance, the high-zinc brass alloys (with the highest levels of tin and zinc and the lowest melting temperature) correspond to most of the Picasso sculptures, correlate with the Valsuani foundry, and are associated with the most recent sculptures (post-WWII) and with the lost-wax casting method. By expanding the ICP-OES database of objects studied, these material correlations may become useful for identifying, dating, or possibly even authenticating other bronzes that do not bear foundry marks. Figure. PMID:19629458

  15. Tamil Chola Bronzes and Swamimalai Legacy: Metal Sources and Archaeotechnology

    Science.gov (United States)

    Srinivasan, Sharada

    2016-08-01

    This review explores the great copper alloy image casting traditions of southern India from archaeometallurgical and ethnometallurgical perspectives. The usefulness of lead isotope ratio and compositional analysis in the finger-printing and art historical study of more than 130 early historic, Pallava, Chola, later Chola, and Vijayanagara sculptures (fifth-eighteenth centuries) is highlighted, including Nataraja, Buddha, Parvati, and Rama images made of copper, leaded bronze, brass, and gilt copper. Image casting traditions at Swamimalai in Tamil Nadu are compared with artistic treatises and with the technical examination of medieval bronzes, throwing light on continuities and changes in foundry practices. Western Indian sources could be pinpointed for a couple of medieval images from lead isotope analysis. Slag and archaeometallurgical investigations suggest the exploitation of some copper and lead-silver sources in the Andhra and Karnataka regions in the early historic Satavahana period and point to probable copper sources for the medieval images in Karnataka, Tamil Nadu, and Andhra Pradesh. The general lower iron content in southern Indian bronzes perhaps renders the proximal copper-magnetite reserves of Seruvila in Sri Lanka as a less likely source. Given the lack of lead deposits in Sri Lanka, however, the match of the lead isotope signatures of a well-known Ceylonese Buddhist Tara in British Museum with a Buddha image from Nagapattinam in Tamil Nadu may underscore ties between the island nation and the southern Indian Tamil regions.

  16. Chemical and Electrochemical Characterization of Artificial Sulphate Patina on Bronze

    Institute of Scientific and Technical Information of China (English)

    MAO Yangwu; NIE Dunwei; MOMBELLO Domenico

    2014-01-01

    Copper patinas are generally regarded as aesthetically pleasing and are supposed to protect copper against further corrosion. The preparation of artificial sulphate patina on bronzes has been realized by immersing the bronze into CuSO4 solution. The effect of immersion time on the formation of the patina has been investigated. The sulphate patina obtained with immersion time of 500 h in CuSO4 solution consists of flat area and crystals. The flat area in the patina is mainly made of cuprite, whereas the crystals are mainly composed of brochantite. The electrochemical measurement of sulphate patina in simulated acid rain with pH 3.1 shows that the protective effectiveness of patina decreases with time and the dissolution of patina is the key factor leading to the degradation of patina. The investigation of the formation mechanism of sulphate patina shows that the cuprite layer forms on the surface of bronze in the initial patination. Then, crystal brochantite grows on the surface of cuprite by the oxidation of cuprite and the incorporation of CuSO4 solution.

  17. HANDICRAFT IN LATE BRONZE-EARLY IRON AGE IN NAKHCHIVAN

    Directory of Open Access Journals (Sweden)

    Toğrul HALİLOV

    2012-04-01

    Full Text Available The article handicraft have been learnt in the Nakhchivan late bronze-early iron age. It was defined that pottery wasone of the ancient craftsmanship areas in Nakhichivan. At that time Nakhichivan, as well as the other regions of Azerbaijan, was an important centre of craftsmanship. The pottery products differed from one another in their size, shape, ornaments on them, the material the were made of and the technology. The pottery products made by Nakhichivan potters were divided into two groups-welfare and kitchen ceramics. Their similar monuments in the South Caucasus and the Middle East in the same period, the archaeological materials found in the Urmia basin and Eastern Anatolia. As a result of comparative investigation it is defined that oldest labour tools producted from bone and stone in Nakchivan. New type of labour tools are producted connecting to treatmen of metal in following period. Stone and bone tools are used little in iron and bronz period. It is defined that daggers, arrow and spear heads, jewelry founded in archaeological monument belong to epoch late bronze-early iron age in the Nakhchivan have got peculiarity of culture of Khojalı-Gadabay in Azerbaijan. Some of daggers belong to culture Near East.

  18. The moessbauer spectroscopy study of an ancient bronze mirror without sampling

    International Nuclear Information System (INIS)

    The Moessbauer spectra of 119Sn for a bronze mirror of the Han Dynasty are described. A method of measuring Moessbauer spectrum without sampling is established. For the sake of contrast, both the spectra of transmission and of γ-ray scattering were measured. The results show that on the surface of the bronze mirror tin is in the state of Sn4+ oxide

  19. The Philippine Press after Marcos: Restored Freedoms and New Problems.

    Science.gov (United States)

    Guimary, Donald L.

    With the overthrow of Ferdinand Marcos from his 20-year rule of the Philippines, the news media regained its freedom and its voice, and now faces a new set of problems: low circulation, questionable ethical standards of reporters and their lack of experience, and ominous indications from the Corazon Aquino government that the administration might…

  20. Abrasive wear of BA1055 bronze with additives of Si, Cr, Mo and/or W

    Directory of Open Access Journals (Sweden)

    B. P. Pisarek

    2008-10-01

    Full Text Available Aluminium bronzes belong to the high-grade constructional materials applied on the put under strongly load pieces of machines, aboutgood sliding, resistant properties on corrosion both in the cast state how and after the thermal processing. It moves to them Cr and Si in the aim of the improvement of their usable proprieties. The additions Mo and/or W were not applied so far. It was worked out therefore the new kind of bronzes casting including these elements. Make additions to the Cu-Al-Fe-Ni bronze of Si, Cr, Mo and/or W in the rise of these properties makes possible. The investigations of the surface distribution of the concentration of elements in the microstructure of the studied bronze on X-ray microanalyzer were conducted. It results from conducted investigations, that in the aluminium bronze BA1055 after makes additions Si, Cr, Mo and/or W the phases of the type κFe, κNi crystallize, probably as complex silicides. Elements such as: Fe and Si dissolve first of all in phases κ, in smaller stage in the matrix of the bronze; Mn, Ni and W they dissolve in matrix and phases κ. It dissolves Cr and Mo in the larger stage in phases κ than in the matrix. The sizes of the abrasive wear were compared in the state cast multicomponentnew casting Cu-Al-Fe-Ni bronzes with the additives Cr, Mo or W with the wear of the bronze CuAl10Fe5Ni5Si. The investigations of thewear were conducted on the standard device. It results from conducted investigations, that make additions to bronze BA1055 of the additives of Si, Cr, Mo, and/or W it influences the rise of the hardness (HB of the bronze in the cast state, in the result of the enlarged quantity separates of hard phases κ, and in the consequence the decrease of the abrasive wear. The addition of molybdenum made possible obtainment of the microhardness of the phase α and γ 2 on the comparable level. From the microstructure of the bronze CuAl10Fe5Ni5MoSi is characterizes the smallest abrasive wear among

  1. Determining Foundry Area of Bronze Vessel Using REE in Clay Mould Residues

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    The composition of casting clay core might provide clue to the foundry area of the bronze vessels. REE analysis of the residual clay mould was conducted by inductively coupled plasma atomic emission spectrometer (ICP-AES). Results reveal that characteristic of REE of clay mould from different region is dissimilar. It is feasible to restrict the possible foundry area of the bronze vessels on the basis of analysis of REE of clay mould residues on the bronzes. Meanwhile, this paper attempts to determine the foundry area of the bronze vessels unearthed at Jiuliandun tombs of Chu State, dated back to Warring States Period, in Zaoyang City, Hubei Province, and at Zuozhong cemetery, Spring and Autumn Period, in Jingmen City, Hubei Province. REE of clay core provides information on the foundry area of bronze vessels.

  2. Metallurgical and Chemical Characterization of Bronze Remains Found at the Houhe Site in Shanxi Province, China

    Science.gov (United States)

    Mu, D.; Nan, P. H.; Wang, J. Y.; Song, G. D.; Luo, W. G.

    2015-07-01

    This study attempts to determine the metallurgical and chemical characteristics of Chinese bronze artifacts from the early Iron Age by taking the bronze artifacts from the Houhe site as an example. The bronze artifacts included vessels, buckles, mirrors, and bells. Elemental compositions of 10 Chinese bronze artifacts from the Houhe site were determined by an x-ray fluorescence system. Microstructures were observed by a polarizing microscope. Most of the artifacts were cast and lacked external evidence of secondary processing. The copper content of the vessels is higher than the other samples, and the copper content of buckles is the lowest. High tin content is a distinctive characteristic of the mirrors. Through comparisons, bells show a decline in the content of copper from the Western Zhou dynasty to the early Han dynasty, and the content of lead increased over time. Combined with historical studies, the findings show that there may have been industrial standards for bronze production during the Han dynasty.

  3. Preliminary result on the analysis of Late Bronze Age metals

    International Nuclear Information System (INIS)

    Complete text of publication follows. The main event of the complex cultural changes during the transition from Middle to Late Bronze Age was the appearance of Tumulus culture in the Danube-Tisza region. In this period people rose mounds (tumuli) above their graves made from stone and soil. According to our present knowledge we believe that the ethnically inhomogeneous Tumulus culture was made homogenous by commerce (especially bronze commerce). Depots were typical of the final period of Middle Bronze Age called Koszider-phase. During the tumulus period the practice of hiding depots came to its end, bronze objects were put into graves. Therefore, it would be important to analyze the relation between the Koszider and Tumulus metallurgy. The main question to be answered is the following: were the trade connections and exchange of goods discontinued during the time of cultural changes? Examination of archaeological finds is carried out usually by typological methods which provide information on the attire fashion and funeral rite of cultures. The inherent capability of analytical techniques makes it possible to draw conclusions on the provenance of metals, thus facilitating to establish the contemporary trade routes. The metal finds from the southern part of the Great Hungarian Plain has not been investigated yet, though it would be important from the point of view of Tumulus culture. The main question is whether there is any noticeable change between the metallurgical craftsmanship of the consecutive eras. Therefore, it is important to determine the composition of the used raw materials, their sources, as well as the applied manufacturing technologies. For the characterization of archaeological bronze finds both conventional X-ray fluorescence (XRF) method and micro proton induced X-ray fluorescence (micro-PIXE) techniques are applied. The first one serves for the determination of the bulk composition of samples while the second one for the characterization of

  4. Novel polar dielectrics with the tetragonal tungsten bronze structure

    OpenAIRE

    Andrei ROTARU

    2013-01-01

    There is great interest in the development of new polar dielectric ceramics and multiferroic materials with new and improved properties. A family of tetragonal tungsten bronze (TTB) relaxors of composition Ba₆M³⁺Nb₉O₃₀ (M³⁺ = Ga³⁺, Sc³⁺ and In³⁺, and also their solid solutions) were studied in an attempt to understand their dielectric properties to enable design of novel polar TTB materials. A combination of electrical measurements (dielectric and impedance spectroscopy) and powder diffr...

  5. Investigation of laser cleaning on bronze cultural relics

    Science.gov (United States)

    Ling, Xiulan; Wang, Gao; Zhang, Chen

    2016-05-01

    The effects of laser cleaning on the corrosion layers of bronze cultural relics were studied using a pulsed fiber laser. The laser cleaning threshold value of the corrosion layers was obtained. It was found that the corrosion layer was removed successfully by employing a laser fluence value of 0.32 J cm-2 and scanning for three times. To obtain experimental evidence, laser con-focal scanning microscopy, scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDS), laser induced breakdown spectroscopy (LIBS) and laser Raman spectroscopy were employed to investigate the cleaning efficiency of corrosion layers on specimens.

  6. Diffusion bonding of titanium alloy to tin-bronze

    Institute of Scientific and Technical Information of China (English)

    李卓然; 冯吉才; 刘会杰

    2002-01-01

    The vacuum diffusion bonding of titanium alloy to tin-bronze has been studied and the feasibility and appropriate processing parameters have been investigated. The maximum tensile strength of the joints is bonded joint has been observed by SEM, X-ray and EPMA, and the main factors affecting diffusion bonding have been analyzed. The intermetallic compounds Ti2Cu and TiCu were formed near the interface. The width and quantity of the intermetallic compound increases with the increase of the bonding time. The formation of the intermetallic compounds results in embrittlement of the joint and the poor joint properties.

  7. Prevention of Dealloying in Manganese Aluminium Bronze Propeller: Part II

    Directory of Open Access Journals (Sweden)

    Napachat Tareelap

    2014-03-01

    Full Text Available Due to the failure of manganese aluminium bronze (MAB propeller caused by dealloying corrosion as described in Part I [1], this work aims to study the prevention of dealloying corrosion using aluminium and zinc sacrificial anodes. The results indicated that both of the sacrificial anodes could prevent the propeller from dealloying. Moreover, the dealloying in seawater was less than that found in brackish water. It was possible that hydroxide ions, from cathodic reaction, reacted with calcium in seawater to form calcium carbonate film protecting the propeller from corrosion.

  8. Environmental roots of the late bronze age crisis.

    Science.gov (United States)

    Kaniewski, David; Van Campo, Elise; Guiot, Joël; Le Burel, Sabine; Otto, Thierry; Baeteman, Cecile

    2013-01-01

    The Late Bronze Age world of the Eastern Mediterranean, a rich linkage of Aegean, Egyptian, Syro-Palestinian, and Hittite civilizations, collapsed famously 3200 years ago and has remained one of the mysteries of the ancient world since the event's retrieval began in the late 19(th) century AD/CE. Iconic Egyptian bas-reliefs and graphic hieroglyphic and cuneiform texts portray the proximate cause of the collapse as the invasions of the "Peoples-of-the-Sea" at the Nile Delta, the Turkish coast, and down into the heartlands of Syria and Palestine where armies clashed, famine-ravaged cities abandoned, and countrysides depopulated. Here we report palaeoclimate data from Cyprus for the Late Bronze Age crisis, alongside a radiocarbon-based chronology integrating both archaeological and palaeoclimate proxies, which reveal the effects of abrupt climate change-driven famine and causal linkage with the Sea People invasions in Cyprus and Syria. The statistical analysis of proximate and ultimate features of the sequential collapse reveals the relationships of climate-driven famine, sea-borne-invasion, region-wide warfare, and politico-economic collapse, in whose wake new societies and new ideologies were created. PMID:23967146

  9. Environmental roots of the late bronze age crisis.

    Directory of Open Access Journals (Sweden)

    David Kaniewski

    Full Text Available The Late Bronze Age world of the Eastern Mediterranean, a rich linkage of Aegean, Egyptian, Syro-Palestinian, and Hittite civilizations, collapsed famously 3200 years ago and has remained one of the mysteries of the ancient world since the event's retrieval began in the late 19(th century AD/CE. Iconic Egyptian bas-reliefs and graphic hieroglyphic and cuneiform texts portray the proximate cause of the collapse as the invasions of the "Peoples-of-the-Sea" at the Nile Delta, the Turkish coast, and down into the heartlands of Syria and Palestine where armies clashed, famine-ravaged cities abandoned, and countrysides depopulated. Here we report palaeoclimate data from Cyprus for the Late Bronze Age crisis, alongside a radiocarbon-based chronology integrating both archaeological and palaeoclimate proxies, which reveal the effects of abrupt climate change-driven famine and causal linkage with the Sea People invasions in Cyprus and Syria. The statistical analysis of proximate and ultimate features of the sequential collapse reveals the relationships of climate-driven famine, sea-borne-invasion, region-wide warfare, and politico-economic collapse, in whose wake new societies and new ideologies were created.

  10. Corrosion characteristics of copper and leaded bronze in palm biodiesel

    Energy Technology Data Exchange (ETDEWEB)

    Haseeb, A.S.M.A.; Masjuki, H.H.; Ann, L.J.; Fazal, M.A. [Department of Mechanical Engineering, University of Malaya, 50603 Kuala Lumpur (Malaysia)

    2010-03-15

    Biodiesel has become more attractive as alternative fuel for automobiles because of its environmental benefits and the fact that it is made from renewable sources. However, corrosion of metals in biodiesel is one of the concerns related to biodiesel compatibility issues. This study aims to characterize the corrosion behavior of commercial pure copper and leaded bronze commonly encountered in the automotive fuel system in diesel engine. Static immersion tests in B0, B50 and B100 fuels were carried out at room temperature for 2640 h. Similar immersion tests in B0, B100 and B100 (oxidized) fuels were also conducted at 60 C for 840 h. At the end of the test, corrosion behavior was investigated by weight loss measurements and changes in surface morphology. Fuels were analyzed by using TAN analyzer, FTIR, MOA (multi-element oil analyzer) to investigate acid concentration, oxidation level with water content and corrosive impurities respectively. Results showed that under the experimental conditions, pure copper was more susceptible to corrosion in biodiesel as compared to leaded bronze. (author)

  11. Letti in bronzo. Dal modello ellenistico alla Cisalpina romana Bronze beds. From hellenistic model to the Roman Cisalpine

    Directory of Open Access Journals (Sweden)

    Federica Giacobello

    2011-03-01

    Full Text Available

    Il contributo presenta una panoramica generale su una particolare e pregiata classe di arredi domestici quali sono i letti con decorazione in bronzo in età romana. Partendo dai modelli greco-ellenistici  e dalla loro introduzione a Roma, ci si sofferma sulla loro tipologia e sugli elementi da cui erano costituiti, per quindi affrontare nello specifico le problematiche inerenti a ritrovamenti di letti in bronzo in Cisalpina.

    Pezzi eccezionale per completezza e realizzazione sono le gambe di letto tricliniare rinvenute a Modena da una ricca domus della città; tali esemplari, già oggetto di studi ricostruttivi, sono in questa sede esaminati in particolare per la scena plastica che li decorava che presenta l’ immagine di Ercole contro il Centauro. L’ipotesi avanzata è che possa essere una testimonianza della propaganda per immagini di Antonio in un frangente particolare quali le lotte civili che interessarono i territori dell’Italia settentrionale nella tarda repubblica.

    The paper presents a general overview of a particular class and fine home furnishings such as beds decorated with bronze in the roman age. Starting from the hellenistic and greek models since their introduction in Rome, we focus on types and elements from which they then set up, to address the specific issues related to discovery of a bronze bed in Cisalpine.

    Exceptional objects s for completeness and achievement are the legs of bed tricliniar found in Modena in a rich domus of the city; such furniture, already the subject of reconstruction studies, are here examined particularly in the plastic scene which they decorated that has the image of Hercules against the Centaur. The hypothesis is that it can be a testimony to the propaganda images of Antonio in a particular juncture that the civil strife that affected the areas of northern Italy in the late Republic.

  12. La docencia en el marco de la responsabilidad social universitaria

    Directory of Open Access Journals (Sweden)

    Luis José Vera Guadrón

    2012-01-01

    Full Text Available El presente artículo tiene como objetivo analizar la docencia en el marco de la responsabilidad social universitaria del profesor en el Programa Educación de la Universidad Nacional Experimental Rafael María Baralt. El tipo de investigación fue descriptiva, con diseño no experimental, de campo y transeccional; los resultados indicaron que los profesores cumplen con la docencia en el marco de la responsabilidad social universitaria. Se concluye que existe conocimiento del contexto institucional para desarrollar la docencia pero desvinculada de la investigación y extensión; se recomienda planificar talleres de formación para evitar la docencia parcelada, sin pertinencia social y científica.

  13. Programa Regional de Indicadores de Desarrollo Infantil (PRIDI): Marco Conceptual

    OpenAIRE

    Patrice Engle; Santiago Cueto; María Estela Ortíz; Aimee Verdisco

    2011-01-01

    El presente documento entrega el marco conceptual y la fundamentación del Proyecto Regional de Indicadores de Desarrollo Infantil (PRIDI), una iniciativa del Banco Interamericano de Desarrollo (BID), cuyo objetivo es generar un programa regional de compilación y uso de datos e indicadores comparables de resultados sobre Desarrollo Infantil (DI). Inspirado por las experiencias del Banco en apoyar pruebas estandarizadas como son el LLECE y el SERCE, esperamos que el carácter regional de los res...

  14. Palaeoethnobotanical Data from the High Mountainous Early Bronze Age Settlement of Tsaghkasar-1 (Mt. Aragats, Armenia

    Directory of Open Access Journals (Sweden)

    Roman Hovsepyan

    2011-09-01

    Full Text Available Palaeoethnobotanical investigations suggest that at least part of the Early Bronze Age population of Tsaghkasar was settled and practiced agriculture in the high mountainous zone. People there appear to have cultivated hexa‐ and tetraploid wheats (probably bread wheat and emmer and barley (possibly hulled. Bronze Age agriculture in the Southern Caucasus differs from earlier and later period when cultivation of pulses, oil‐producing plants, and other plants was common. This emphasis on the cultivation and use of certain cereal grains at Early Bronze sites such as Tsaghkasar can tentatively be added to a constellation of practices associated with the Kura‐Araxes culture in the South Caucasus.

  15. History of a Bronze Age tell and its environment

    Science.gov (United States)

    Kovács, Gabriella; Füleky, György; Vicze, Magdolna

    2016-04-01

    Százhalombatta-Földvár is the most excessively researched Bronze Age tell site in Hungary. Parallel to the investigation of the settlement structure and activity patterns the changes of the landscape and the effect of human alteration is also studied. Significant changes of the landscape can be detected from the Bronze Age until the recent natural and cultural heritage protection of the area. Archaeological, soil analytical and thin section soil micromorphological methods are used to reconstruct the past 4000 years of the tell and its immediate surroundings. Prior to the Bronze Age the area was covered by forest vegetation, so the initial settling could only be realised after deforestation (2000 BC). The result of the soil corings and the prepared soil thin sections are solid proves of this action. It also became evident that at some areas - so far it seems that at locales where house floors were laid for the very first time - even the topsoil was removed so intensively that only the B horizon of the relict forest soil can be found. This observation needs to be further tested outside the habitation area to define the horizontal extension of the forest clearance and the topsoil removal. The northern side of the settlement is bordered by a natural erosion gully. At 2000 BC it was just a natural depression, but by 1500 BC it was deepened to serve as a fortification ditch. Around 1200 BC the ditch started to be filled in and by 1000 BC it was refilled to such an extent that its surface was utilised again. At about 600 BC (Late Iron Age) a smaller inner rampart was erected on the southern side of the ditch for inner separation. Not much is known about the Roman period of this area (200 AD) but the remnants of a watchtower indicate their presence. During the 18th century AD the area was used for grape cultivation and later for hobby gardens up until the protection of the area in the late 20th century. Since then species of the original vegetation started to grow back

  16. MarcoPolo-R: Asteroid Sample Return Mission

    Science.gov (United States)

    Brucato, John Robert

    2012-07-01

    MarcoPolo-R is a sample return mission to a primitive Near-Earth Asteroid (NEA) selected for the assessment study in the framework of ESA Cosmic Vision 2015-25 program. MarcoPolo-R is an European-led mission with a proposed NASA contribution. MarcoPolo-R will rendezvous with a primitive carbon-rich NEA, scientifically characterize it at multiple scales, and return a unique sample to Earth unaltered by the atmospheric entry process or terrestrial weathering. The baseline target is a binary asteroid (175706) 1996 FG3, which offers a very efficient operational and technical mission profile. A binary target also provides enhanced science return. The choice of this target will allow new investigations to be performed more easily than at a single object, and also enables investigations of the fascinating geology and geophysics of asteroids that are impossible at a single object. Several launch windows have been identified in the time-span 2020-2024. The baseline mission scenario of MarcoPolo-R to 1996 FG3 foresees a single primary spacecraft, carrying the Earth re-entry capsule and sample acquisition and transfer system, launched by a Soyuz-Fregat rocket from Kourou. The scientific payload includes state-of-the-art instruments, e.g. a camera system for high resolution imaging from orbit and on the surface, spectrometers covering visible, near-infrared and mid-infrared wavelengths, a neutral-particle analyser, a radio science experiment and optional laser altimeter. If resources are available, an optional Lander will be added to perform in-situ characterization close to the sampling site, and internal structure investigations. MarcoPolo-R will allow us to study the most primitive materials available to investigate early solar system formation processes. The main goal of the MarcoPolo-R mission is to return unaltered NEA material for detailed analysis in ground-based laboratories. Only in the laboratory can instruments with the necessary precision and sensitivity be

  17. Gestão Social nos marcos neoliberais: única alternativa à democracia?

    Directory of Open Access Journals (Sweden)

    Marília Gonçalves Dal Bello

    2010-07-01

    Full Text Available O trabalho aqui apresentado tem como foco a gestão social nos marcos do neoliberalismo nos anos 1970, momento em que é colocada como estratégia para exaltar o mercado como instância de regulação econômica e política da vida social, em detrimento do cercear da participação da sociedade civil como instância participativa, tendo em vista a construção de uma gestão pública democrática. Assim, o objetivo deste trabalho é tecer uma discussão sobre as distorções teóricas e práticas em torno do termo sociedade civil, a fim de elucidar o sentido de participação, como lócus de proposições e disputas que permeiam a construção democrática. Isso se contrapõe a ideia de sociedade civil como sinônimo de solidariedade, voluntariado ou terceiro setor. A metodologia do trabalho associou-se à revisão bibliográfica, cujos referenciais contribuíram para uma apresentação crítica sobre a gestão social. Os resultados aqui apresentados apontam para a necessidade de uma maior consolidação dos espaços públicos e da sociedade civil como atores de fundamental importância para a construção de uma gestão pública democrática.

  18. Cavitation erosion behavior of nickel-aluminum bronze weldment

    Institute of Scientific and Technical Information of China (English)

    李小亚; 闫永贵; 许振明; 李建国

    2003-01-01

    Cavitation erosion behavior of nickel-aluminum bronze(NAB)weldment in 3.5% NaCl aqueous solution was studied by magnetostrictive vibratory device for cavitation erosion.The results show that cavitation erosion resistance of the weld zone(WZ)of the weldment is superior to that of the base metal.SEM observation of eroded specimens reveals that the phases undergoing selective attack by the stress of cavitation erosion at the early stage of cavitation erosion are:martensite in the WZ,α phase in the heat-affected zone(HAZ)and eutectoidal phase in the base metal; the microcracks causing cavitation damage initiate at the phase boundaries.

  19. LAMQS analysis applied to ancient Egyptian bronze coins

    International Nuclear Information System (INIS)

    Some Egyptian bronze coins, dated VI-VII sec A.D. are analyzed through different physical techniques in order to compare their composition and morphology and to identify their origin and the type of manufacture. The investigations have been performed by using micro-invasive analysis, such as Laser Ablation and Mass Quadrupole Spectrometry (LAMQS), X-ray Fluorescence (XRF), Laser Induced Breakdown Spectroscopy (LIBS), Electronic (SEM) and Optical Microscopy, Surface Profile Analysis (SPA) and density measurements. Results indicate that the coins have a similar bulk composition but significant differences have been evidenced due to different constituents of the patina, bulk alloy composition, isotopic ratios, density and surface morphology. The results are in agreement with the archaeological expectations, indicating that the coins have been produced in two different Egypt sites: Alexandria and Antinoupolis. A group of fake coins produced in Alexandria in the same historical period is also identified.

  20. LAMQS analysis applied to ancient Egyptian bronze coins

    Energy Technology Data Exchange (ETDEWEB)

    Torrisi, L., E-mail: lorenzo.torrisi@unime.i [Dipartimento di Fisica dell' Universita di Messina, Salita Sperone, 31, 98166 Messina (Italy); Caridi, F.; Giuffrida, L.; Torrisi, A. [Dipartimento di Fisica dell' Universita di Messina, Salita Sperone, 31, 98166 Messina (Italy); Mondio, G.; Serafino, T. [Dipartimento di Fisica della Materia ed Ingegneria Elettronica dell' Universita di Messina, Salita Sperone, 31, 98166 Messina (Italy); Caltabiano, M.; Castrizio, E.D. [Dipartimento di Lettere e Filosofia dell' Universita di Messina, Polo Universitario dell' Annunziata, 98168 Messina (Italy); Paniz, E.; Salici, A. [Carabinieri, Reparto Investigazioni Scientifiche, S.S. 114, Km. 6, 400 Tremestieri, Messina (Italy)

    2010-05-15

    Some Egyptian bronze coins, dated VI-VII sec A.D. are analyzed through different physical techniques in order to compare their composition and morphology and to identify their origin and the type of manufacture. The investigations have been performed by using micro-invasive analysis, such as Laser Ablation and Mass Quadrupole Spectrometry (LAMQS), X-ray Fluorescence (XRF), Laser Induced Breakdown Spectroscopy (LIBS), Electronic (SEM) and Optical Microscopy, Surface Profile Analysis (SPA) and density measurements. Results indicate that the coins have a similar bulk composition but significant differences have been evidenced due to different constituents of the patina, bulk alloy composition, isotopic ratios, density and surface morphology. The results are in agreement with the archaeological expectations, indicating that the coins have been produced in two different Egypt sites: Alexandria and Antinoupolis. A group of fake coins produced in Alexandria in the same historical period is also identified.

  1. Elements inter-diffusion in the turning of wear-resistance aluminum bronze

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Inter-diffusion of elements between the tool and the workpiece during the turning of aluminum bronze using high-speed steel and cemented carbide tools have been studied. The tool wear samples were prepared by using M2 high-speed steel and YW1 cemented carbide tools to turn a novel high strength, wear-resistance aluminum bronze without coolant and lubricant. Adhesion of workpiece materials was found on all tools' surface. The diffusion couples made of tool materials and aluminum bronze were prepared to simulate the inter-diffusion during the machining. The results obtained from tool wear samples were compared with those obtained from diffusion couples. Strong inter-diffusion between the tool materials and the aluminum bronze was observed in all samples. It is concluded that diffusion plays a significant role in the tool wear mechanism.

  2. University receives 2009 Governor's Environmental Excellence Bronze Medal for Campus Tree Tour 2008 Event

    OpenAIRE

    West, Hilary

    2009-01-01

    Virginia Tech received the 2009 Governor's Environmental Excellence Bronze Medal in the Environmental Project (Government) category for hosting the Campus Tree Tour 2008 tree planting event in Blacksburg on Oct. 21, 2008.

  3. The Bronze "Ding of Flourishing Olympic "for the Main Stadium of the 2008 Olympic Games

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    @@ The bronze "Ding of Flourishing Olympic" for the main stadium of the 2008Olympic Games has been completed by Yuda Group Company. The "Ding of Flourishing Olympic" was designed by Lanzhou Ludu Chunqiu Cultural Disseminating Co. Ltd.

  4. Influence Cr on Crystallization and the Phase Transformations of the Bronze BA1044

    Directory of Open Access Journals (Sweden)

    B. P. Pisarek

    2007-07-01

    Full Text Available The investigations were introduced in the paper, method of thermal and derivative analysis (TDA, the process of crystallization and phase transformation in the solid state of the aluminium bronze CuA110Fe4Ni4 (BA1044 and with the addition 0.3% Cr. Two intermetallic phase were identified in the microstructure of the bronze BA1044: κFel - rich in Fe and Cu and κFe2 - rich in Fe, and in the microstructure of the bronze BA1044+0.3 % Cr only one phase κFel - rich in Fe, Cu and Cr. The presence of chrome in the bronze BA1044 reduce size the primary crystals of the phase β, reduces the dynamics of the processes of thermal phase transformation in the solid state and lengthens the time their of duration.

  5. Facile Preparation of Molybdenum Bronzes as an Efficient Hole Extraction Layer in Organic Photovoltaics.

    Science.gov (United States)

    Wang, Jiantai; Zhang, Jun; Meng, Bin; Zhang, Baohua; Xie, Zhiyuan; Wang, Lixiang

    2015-06-24

    We proposed a facile and green one-pot strategy to synthesize Mo bronzes nanoparticles to serve as an efficient hole extraction layer in polymer solar cells. Mo bronzes were obtained through reducing the fractional self-aggregated ammonium heptamolybdate with appropriate reducing agent ascorbic acid, and its optoelectronic properties were fully characterized. The synthesized Mo bronzes displayed strong n-type semiconductor characteristics with a work function of 5.2-5.4 eV, matched well with the energy levels of current donor polymers. The presented gap states of the Mo bronzes near the Fermi level were beneficial for facilitating charge extraction. The as-synthesized Mo bronzes were used as hole extraction layer in polymer solar cells and significantly enhanced the photovoltaic performance and stability. The power conversion efficiency was increased by more than 18% compared with the polyethylene dioxythiophene:polystyrenesulfonate-based reference cell. The excellent performance and facile preparation render the as-synthesized solution-processed Mo bronzes nanoparticles a promising candidate for hole extraction layer in low-cost and efficient polymer solar cells.

  6. Investigating Early/Middle Bronze Age copper and bronze axes by micro X-ray fluorescence spectrometry and neutron imaging techniques

    Science.gov (United States)

    Figueiredo, Elin; Pereira, Marco A. Stanojev; Lopes, Filipa; Marques, José G.; Santos, Joana P.; Araújo, M. Fátima; Silva, Rui J. C.; Senna-Martinez, João C.

    2016-08-01

    Micro X-ray fluorescence (micro-XRF) analysis and neutron imaging techniques, namely 2D radiography and 3D tomography, have been applied for the study of four metal axes from the Early/Middle Bronze Age in Western Iberia, a period characterized by a metallurgical change in the use of copper to bronze. Micro-XRF analysis has shown that one of the axes was produced in copper with some arsenic while the other three were produced in a copper-tin alloy (bronze) with variable tin contents and some arsenic and lead. Neutron radiography and tomography were applied to study internal heterogeneities of the axes in a non-invasive way since the specificities of neutron interaction with matter allow a suitable penetration of these relatively thick copper-based objects when compared to the use of a conventional X-ray radiography. Neutron imaging allowed the visualization of internal fissures and pores and the evaluation of their distribution, size and shape. Relevant information for the reconstruction of ancient manufacturing techniques was gathered, revealing that one ax was produced with the mold in an angle of ≈ 25°, probably to facilitate gas escape during metal pouring. Also, information regarding physical weaknesses of the axes was collected, providing relevant data for their conservation. The combination of these non-destructive techniques allowed the evaluation of the metal composition and the internal structure of the axes. Micro-XRF allowed the distinction among copper and bronze axes, and provided data about the composition of early bronzes for which data is scarce. The neutron imaging study allowed for the first time the visualization of internal heterogeneities in early bronze axes, namely pores and large voids, providing relevant information for the reconstruction of ancient manufacturing techniques and raising pertinent information regarding physical weaknesses of these types of objects.

  7. Ley marco de aseguramiento universal en salud, bajo la lupa

    Directory of Open Access Journals (Sweden)

    Leoncio Díaz

    2009-04-01

    Full Text Available La Ley Marco de Aseguramiento Universal en Salud, concebida en el marco del modelo neoliberal conservador, excluyente y polarizante, fue aprobada en circunstancias en la que persisten grandes contrastes entre sistemas de salud. Por un lado, los países que mantienen subsistemas inconexos y privatizados y, por otro, los que unificados y bajo la responsabilidad del Estado, garantizan a todos el acceso integral, gratuito y de calidad a los servicios de salud. En América y el Caribe, existen países cuyos pobladores carecen de derechos y posibilidades, evidenciando las profundas inequidades que mantienen en exclusión a la mayoría pobre y de extrema pobreza, entre ellos, el Perú muestra indicadores de salud que aún se mantienen en cifras alarmantes y por debajo de los que presentan otras realidades en el mundo. En las últimas tres décadas hubo ensayos frustros de reformas, como la integración funcional del Ministerio de Salud con el Instituto Peruano de Seguridad Social, o el Sistema Nacional Coordinado y Descentralizado en Salud. Actualmente se formula la Ley Marco de Aseguramiento Universal, que mantiene los actuales subsistemas sin variación alguna y con sus propias autonomías, ensayando pilotos, estableciendo planes parciales, implementándola de manera progresiva, priorizando la privatización y debilitando la función rectora del Ministerio de Salud, al crear una superintendencia omnipotente, lo cual continuará permitiendo la exclusión social de más de 9 millones de peruanos. Existe, por tanto, la necesidad de plantear la unificación de los subsistemas, para construir un Sistema Único de Salud, capaz de otorgar salud plena, integral, de calidad y sin costo alguno al 100% de ciudadanos.

  8. Análisis del futuro marco de referencia internacional

    Science.gov (United States)

    Cionco, G. R.; Arias, E. F.

    La técnica de interferometría de muy larga línea de base (VLBI) se aplica hoy a la astrometría para el cálculo de posiciones precisas de radiofuentes extragalácticas. Por tratarse de objetos lejanos, sus movimientos propios aparentes pueden considerarse nulos; esta propiedad hace que los catálogos de radiofuentes extragalácticas VLBI constituyan la mejor materialización de un sistema de referencia celeste inercial definido cinemáticamente. La Unión Astronómica Internacional (IAU) recomendó la adopción de un nuevo sistema de referencia celeste internacional materializado por las coordenadas ecuatoriales de objetos extragalácticos observados con le técnica VLBI. Para superar la precisión astrométrica actual es necesaria una mejora en la modelización de aquellos fenómenos que pueden introducir desviaciones sistemáticas en el marco de referencia celeste. El objetivo de este trabajo es poner de manifiesto las sistematicidades presentes en los distintos marcos de referencia elaborados con el próposito de materializar el nuevo sistema de referencia celeste de la IAU. Para la comparación de los distintos marcos de referencia se propone un modelo de tres rotaciones diferenciales más un término lineal que procura absorber los efectos sistemáticos presentes en las coordenadas. Se analiza igualmente la estabilidad de la solución cuando se utilizan distintos conjuntos de objetos de definición.

  9. The multidimensional evaluation and treatment of anxiety in children and adolescents: rationale, design, methods and preliminary findings Avaliação multidimensional e tratamento da ansiedade em crianças e adolescentes: marco teórico, desenho, métodos e resultados preliminares

    Directory of Open Access Journals (Sweden)

    Giovanni Abrahão Salum

    2011-06-01

    Full Text Available OBJECTIVE: This study aims to describe the design, methods and sample characteristics of the Multidimensional Evaluation and Treatment of Anxiety in Children and Adolescents - the PROTAIA Project. METHOD: Students between 10 and 17 years old from all six schools belonging to the catchment area of the Primary Care Unit of Hospital de Clínicas de Porto Alegre were included in the project. It comprises five phases: (1 a community screening phase; (2 a psychiatric diagnostic phase; (3 a multidimensional assessment phase evaluating environmental, neuropsychological, nutritional, and biological factors; (4 a treatment phase, and (5 a translational phase. RESULTS: A total of 2,457 subjects from the community were screened for anxiety disorders. From those who attended the diagnostic interview, we identified 138 individuals with at least one anxiety disorder (apart from specific phobia and 102 individuals without any anxiety disorder. Among the anxiety cases, generalized anxiety disorder (n = 95; 68.8%, social anxiety disorder (n = 57; 41.3% and separation anxiety disorder (n = 49; 35.5% were the most frequent disorders. CONCLUSION: The PROTAIA Project is a promising research project that can contribute to the knowledge of the relationship between anxiety disorders and anxiety-related phenotypes with several genetic and environmental risk factors.OBJETIVO: o objetivo deste estudo é descrever o desenho, os métodos e as características amostrais da Avaliação Multidimensional e Tratamento da Ansiedade em Crianças e Adolescentes - Projeto PROTAIA. MÉTODO: Escolares entre 10 e 17 anos de todas as escolas pertencentes à área de abrangência da unidade de atenção primária do Hospital de Clínicas de Porto Alegre foram incluídos no projeto. O projeto compreende cinco fases: 1 triagem comunitária; 2 diagnóstico psiquiátrico; 3 avaliação multidimensional, incluindo fatores ambientais, neuropsicológicos, nutricionais e marcadores biológicos; 4

  10. Marco de trabajo para gestionar las competencias laborales

    OpenAIRE

    Franklin Sandoval; Doris Pernalete

    2014-01-01

    En este artículo se presenta un marco de trabajo innovador diseñado y desarrollado para posibilitar la realización de estudios inherentes con la gestión por competencia en los entornos laborales de la Administración Pública Venezolana (APV). Se analizaron los principales aspectos involucrados con la Gestión del Talento Humano (GTH), que se basan en la competencia laboral, las cuales mediante su desarrollo efectivo se constituyen en fuente principal para impulsar el logro de los objetivos empr...

  11. Instituciones y desarrollo económico. Un marco conceptual

    OpenAIRE

    Pablo Bandeira

    2009-01-01

    En los últimos años ha habido una explosión de trabajos econométricos que intentan identificar los factores que determinan el desarrollo económico. No obstante, la falta de una teoría que integre los aspectos económicos, políticos y culturales hace muy confusa la interpretación de los resultados. Este artículo propone un marco conceptual que ayude a entender los resultados econométricos de la literatura en ciencias sociales, extraer algunas conclusiones sobre las instituciones políticas y eco...

  12. Comparative solar EUV flux for the San Marco ASSI

    Science.gov (United States)

    Tobiska, W. K.; Chakrabarti, S.; Schmidtke, G.; Doll, H.

    1993-01-01

    The Airglow and Solar Spectrometer Instrument (ASSI) on the San Marco D/L satellite has measured solar extreme ultraviolet irradiances. The data are currently being released for analysis. As a preliminary step in evaluating this important dataset, modeled solar irradiances from 4 to 105 nm are presented for comparison to the San Marco data. The comparable flux for March-December 1988 is obtained from a revised and extended empirical solar EUV model derived from OSO 1, OSO 3, OSO 4, OSO 6, AEROS A, and AE-E satellite and six rocket flight datasets. Solar rotational features are prominent on several occasions in the model time series. A useful example is the modeled integrated flux between 30-31 nm which includes the Si XI (30.3-nm) and He II (30.4-nm) irradiance. The modeled flux in this 1-nm range shows both an absolute 22 percent increase from beginning to end of mission and a solar rotational variability with a typical peak-to-valley ratio of 14 percent.

  13. Marco de trabajo para gestionar las competencias laborales

    Directory of Open Access Journals (Sweden)

    Franklin Sandoval

    2014-12-01

    Full Text Available En este artículo se presenta un marco de trabajo innovador diseñado y desarrollado para posibilitar la realización de estudios inherentes con la gestión por competencia en los entornos laborales de la Administración Pública Venezolana (APV. Se analizaron los principales aspectos involucrados con la Gestión del Talento Humano (GTH, que se basan en la competencia laboral, las cuales mediante su desarrollo efectivo se constituyen en fuente principal para impulsar el logro de los objetivos empresariales orientados en responder las necesidades del entorno laboral y las exigencias del mercado. El desarrollo, se fundamento en el dominio del conocimiento de las competencias laborales y perfiles de cargos que estructura el proceso de gestión sobre tres actividades: 1 identificación, 2 desarrollo y 3 evaluación. El método utilizado, fue proyectivo y permitió obtener un marco de trabajo en el que se describe una metodología, la cual establece formalmente las reglas, estándares, así como secuencias de pasos para la caracterización de la competencia laboral y, sobre todo, la gestión que promueve las tareas y roles para la toma de decisiones.

  14. Flux pinning in bronze-processed Nb3Sn wires

    International Nuclear Information System (INIS)

    The scaling law derived by Kramer for magnetic flux pinning in high magnetic fields was examined for its applicability to the magnetic field dependence of critical-current densities in the bronze processed monofilamentary Nb3Sn wires. From this it was concluded that: (1) its prediction for the form of the dependence of critical current on magnetic field and grain size [/J vector /sub c/ x H vector/ approx. h/sup 1/2/(1-h)2(1-a0√rho)-2] was found to be very good in most cases including wires with very small Nb3Sn grains (approx. 400 A). It was found very useful in comparison of J/sub c/ for different wires and in extrapolating to obtain H/sub c2/ for these wires. (2) However, it could not account consistently for the anisotropy in critical current of a tape which was measured with H applied perpendicular and parallel to the tape face. (3) The values of kappa1 which were determined with the scaling law were too small by a factor of 2 to 3, and the trend in the variation with heat-treating time was opposite to that which is reasonably to be expected. That the behavior of kappa1 is thus seriously in contradiction with the expected behavior for Nb3Sn suggests basic faults in the derivation of the scaling equation for critical currents at high magnetic fields

  15. Understanding metal–insulator transition in sodium tungsten bronze

    Indian Academy of Sciences (India)

    Sanhita Paul; Satyabrata Raj

    2015-06-01

    We have carried out angle-resolved photoemission spectroscopy (ARPES) and spectromicroscopy studies to understand the metal–insulator transition (MIT) observed in sodium tungsten bronzes, NaWO3. The experimentally determined band structure is compared with the theoretical calculation based on full-potential linear augmented plane-wave method. It has been found that there is a good gross agreement between experiment and theory. ARPES spectra on the insulating sample show that the states near F are localized due to the random distribution of Na in WO3 lattice which causes strong disorder in the system. Our spectromicroscopy measurements on both insulating and metallic samples do not approve percolation model to explain MIT in NaWO3. Photoemission spectroscopy on metallic samples does not show any Na-induced impurity band (level), which was one of the models to explain MIT. Electron-like Fermi surface(s) has been found from our experiment for metallic samples at the (X) point which shows good agreement with band calculation.

  16. Exploring the bronzing effect at the surface of ink layers

    Science.gov (United States)

    Hébert, Mathieu; Mallet, Maxime; Deboos, Alexis; Chavel, Pierre; Kuang, Deng-Feng; Hugonin, Jean-Paul; Besbes, Mondher; Cazier, Anthony

    2015-03-01

    We investigate the optical phenomenon responsible for the colored shine that sometimes appears at the surface of ink layers in the specular direction, often called bronzing or gloss differential. It seems to come from the wavelength-dependent refractive index of the ink, which induces a wavelength-dependent reflectance of the ink-air interface. Our experiments on cyan and magenta inkjet inks confirm this theory. Complex refractive indices can be obtained from measurements of the spectral reflectance and transmittance of a transparency film coated with the ink. We propose a correction of the classical Clapper-Yule model in order to include the colored gloss in the prediction of the spectral reflectance of an inked paper. We also explored effects of scattering by the micrometric or nanometric roughness of the ink surface. The micrometric roughness, easy to model with a geometrical optics model, can predict the spreading of the colored gloss over a large cone. Electromagnetic models accounting for the effect of the nanometric roughness of the surface also predict the attenuation of short wavelengths observed under collimated illumination.

  17. Corrosion of Bronzes by Extended Wetting with Single versus Mixed Acidic Pollutants

    Directory of Open Access Journals (Sweden)

    Liliana Gianni

    2014-04-01

    Full Text Available The corrosion of bronzes was examined in the context of single-acid versus mixed-acid (as in urban acid rain solutions. Two bi-component bronzes (copper with either 3% Sn or 7% Sn that closely represent those of historic artifacts were immersed for five weeks in conditions designed to replicate those experienced by statues and ornaments in cities where rainfall and humidity constantly produce an electrolyte layer on the surfaces of bronzes. Ions, acids, and particles of pollutants can dissolve in this layer, resulting in a variety of harsh corrosion processes. The kinetics of corrosion and the properties of the resulting patinas were monitored weekly by electrochemical impedance spectroscopy and open-circuit potential measurements. The sizes and appearances of the corrosion products were monitored and used to estimate the progress of the corrosion, whose crystalline structures were visualized using scanning electron microscopy with energy dispersive spectroscopy, identified by X-ray diffraction, and characterized by spectrocolorimetry. The electrochemical measurements demonstrated that greater damage (in terms of color change and corrosion product formation did not correspond to deficiencies in protection. The mixed-acid solution did not corrode the bronzes, as would be expected from the additive effects of the single acids. The postulated mechanisms of metal dissolution appear to be specific to a particular bronze alloy, with the tin component playing an important role.

  18. Dating simple flakes: Early Bronze Age flake production technology on the Middle Euphrates Steppe, Syria

    Directory of Open Access Journals (Sweden)

    Yoshihiro Nishiaki

    2014-03-01

    Full Text Available Aceramic flint scatters, comprising very crude cores or flakes and no formalised tools, are frequently found on the Middle Euphrates steppe of northern Syria. Previous studies suggest that many of them are residues of short-term activities by the nomads or shepherds of the Early Bronze Age. In order to verify this interpretation, a more precise chronological framework needs to be established for the Early Bronze Age lithic industry. This paper analyses stratified flake assemblages of the Early Bronze Age at Tell Ghanem al-Ali, a securely radiocarbon-dated settlement on the Middle Euphrates, and examines which occupation level yields assemblages most similar to those of the steppe. Results demonstrate that the lithic industry of this period underwent significant diachronic changes in terms of core reduction technology. Based on the chronological framework developed at Tell Ghanem al-Ali, the steppe assemblages in question can be assigned to different phases of the Early Bronze Age. This finding will help identify processes at the beginning of the extensive exploitation of the steppe, which is regarded as one of the most important socioeconomic changes that occurred among Early Bronze Age communities of the Middle Euphrates.

  19. Modele a anticipations rationnelles de la conjoncture simulee : MARCOS.

    OpenAIRE

    Jacquinot, P.; Mihoubi, F.

    2000-01-01

    MARCOS est un modèle étalonné de l'économie française en présence d'anticipations rationnelles. Son principal objectif est la réalisation d'exercices de simulation sur un horizon de moyen long terme. Il a été construit en adoptant l'hypothèse d'un petit pays où les marchés des biens et du travail sont dans un contexte de concurrence monopolistique, les salaires sont négociés suivant un modèle de droit à gérer l'emploi et la consommation des ménages non contraints par les liquidités résulte d'...

  20. Marcos interpretativos, identidad e imaginario en el mexica movement

    Directory of Open Access Journals (Sweden)

    Aquiles Chihu Amparán

    2007-01-01

    Full Text Available El objetivo de este artículo es analizar el mexica movement, a través de su discurso e imaginario, representados en un conjunto de utopías, símbolos, mitos y creencias, que revitalizan la cultura y el pasado mesoamericano. Se aplica la metodología del análisis de los marcos (frame analysis, con sus cinco partes: el protagonista, el problema, el antagonista, las metas y la audiencia. En el estudio de los movimientos sociales ha prevalecido el análisis de los aspectos políticos y estructurales, aquí a dichos movimientos se les observa en función de sus capacidades como productores de significados, que contribuyen a conformar su identidad colectiva.

  1. Marco Polo’s 'Devisement dou monde' and Franco-Italian tradition

    Directory of Open Access Journals (Sweden)

    Alvise Andreose

    2015-02-01

    Full Text Available The manuscript BNF fr. 1116 (F is the best surviving witness of the Devisement dou monde both for the quality of its reading and because it offers the closest version to the original form of the text. The book was written by Marco Polo, who had travelled for 24 years in Asia in the last quarter of the thirteenth century, and Rustichello da Pisa, an Arthurian romance writer, while both were prisoners in Genoa in 1298. The language in which the work was first written – an Old French heavily sprinkled with morphological as well as lexical Italianisms – is considered as a representative example of «Franco-Italian». The great heterogeneity of the texts usually included within this category, however, might provide an incorrect impression as regards both the original linguistic form of the Devisement and the audience to whom it was originally addressed. The language of the MS BNF fr. 1116 does not display strong similarities to the hybrid language used in Northern Italy for chivalric literature, which is traditionally called «Franco-Italian» or «Franco-Venetan». Some linguistic correspondences enable us to connect the MS BNF fr. 1116 with the group of Old French manuscripts copied by Pisan scribes while incarcerated in Genoa prison, following the battle of Meloria (1284. The fragment of the Devisement recently discovered by C. Concina appears to be very similar to F. Both graphic and phonetic evidences suggest that this witness, too, has to be localised to Tuscany.

  2. Monitoring and assessment of regional air quality in China using space observations (Marco Polo)

    NARCIS (Netherlands)

    Ronald, A. van der; Timmermans, R.; Bai, J.; Zhang, Q.; Wal, L. van der

    2013-01-01

    In this paper we will present the FP7-project 'MarcoPolo'. The main objective of MarcoPolo is to improve air quality monitoring, modelling and forecasting over China using satellite data. During the project a new emission inventory will be constructed by combining Chinese and European expertise. It

  3. 青铜乐器自名研究%A Study of the Names Inscribed on Bronze Musical Instruments

    Institute of Scientific and Technical Information of China (English)

    陈双新

    2001-01-01

    Based on his studies of the bronze musical instruments, the author analyses the inscriptions referring the self-named modifiers and tries to give them new explanations. The study is important to understand the function and values of the bronze musical instruments.

  4. Políticas urbanas no Brasil: marcos legais, sujeitos e instituições

    Directory of Open Access Journals (Sweden)

    Celene Tonella

    2013-04-01

    Full Text Available A questão urbana no Brasil - traduzida como o direito à cidade e à moradia digna - nas três últimas décadas passou por intensas transformações tanto em seus marcos regulatórios quanto na forma de envolvimento das diferentes instituições e sujeitos localizados na sociedade e no aparato estatal. Desde os debates que antecederam a Assembleia Nacional Constituinte na década de 1980, a mobilização tem sido intensa e marcada por tensões entre os diversos atores. Busca-se demonstrar as incorporações de diferentes sujeitos por meio de processos democráticos participativos, como conselhos e conferências, os resultados obtidos por meio da consolidação de legislação específica e os limites atuais da Política Urbana.The urban question in Brazil - translated as the right to the city and to dignity housing - in the three last decades has passed by intense transformations in its regulatory landmarks and in its forms of involvement of different institutions and citizens located in the society and in state apparatus. Since the debates that had preceded the National Constituent Assembly, in the decade of 1980, the mobilization has been intense and marked by tensions between diverse actors. We aim to demonstrate the incorporations of different citizens by democratic participatory processes, such as councils and conferences, the achievements of the consolidation of specific legislation and current limits of the Urban Policy.

  5. Preliminary study on corrosion layers of unearthed bronzes relics of Xizhou dynasty, China

    International Nuclear Information System (INIS)

    Engineering barrier for HLW repository is composed of vitrified waste, canister and buffer/backfill material. Assessment of the applicability of metal as candidate materials of canister for HLW has been conducted in some countries.. Many bronze relics in Xizhou Dynasty, China, dated from more than 3000 years ago, have been preserved perfectly. The study on the corrosion of the bronze relics would contribute to the material selection and design of canister for HLW. The corrosion products of ancient bronzes consist of copper carbonate hydrate, lead carbonate, copper oxides etc. The corrosion mechanism of the substrate were mainly characterized by electrochemical corrosion, whereas the corrosion mechanism of surface layers was characterized by direct chemical corrosion and electrochemical corrosion. (author)

  6. DEGRADATION WORKS OF MONUMENTAL ART CAST BRONZE UNDER THE INFLUENCE OF ENVIRONMENTAL FACTORS

    Directory of Open Access Journals (Sweden)

    Delia NICA-BADEA

    2012-11-01

    Full Text Available Intensive pollution, combined with the lack of conservation of monuments exposed to these environments make the main cause of deterioration of cultural objects to atmospheric corrosion metal. This paper proposes a study of the main factors leading to degradation Bronze alloy, cast bronze monuments exposed to open atmosphere: corrosive environmental factors, stability and products of corrosion of bronze. In general, all corrosion products present on a metal surface are indicated as 'skate', can be composed of single-layer or multilayer products. The paper also includes a case study on the influence of environmental factors on degradation Matthias monument statue in Cluj-Napoca, Romania. Visual inspection of the monument informs us that have white spots, gray, reddish not consistent with the base color green patina, surfaces showing depigmentation, the rain washed areas, crystallization, deposition of air-borne particles.

  7. Tool wear mechanism in turning of novel wear-resisting aluminum bronze

    Institute of Scientific and Technical Information of China (English)

    倪东惠; 夏伟; 张大童; 郭国文; 邵明

    2003-01-01

    Tool wear and wear mechanism during the turning of a wear-resisting aluminum bronze have been stud-ied. Tool wear samples were prepared by using M2 high-speed steel and YW1 cemented carbide tools to turn a novelhigh strength, wear resisting aluminum bronze without coolant and lubricant. Adhesion of workpiece materials wasfound on tool's surface. Under the turning condition used in this study major wear mechanisms for turning aluminumbronze using M2 high-speed steel tool are diffusion wear, adhesive wear and plastic deformation and shear on thecrater. Partial melting of high-speed steel on the rake plays a role in the tool wear also. Major wear mechanisms forturning aluminum bronze using YW1 cemented carbide tool are diffusion wear, attrition wear and sliding wear. Tocontrol the machining temperature is essential to reduce tool wear.

  8. The huastec region: a second locus for the production of bronze alloys in ancient mesoamerica.

    Science.gov (United States)

    Hosler, D; Stresser-Pean, G

    1992-08-28

    Chemical analyses of 51 metal artifacts, one ingot, and two pieces of intermediate processed material from two Late Post Classic archeological sites in the Huastec area of Eastern Mesoamerica point to a second production locus for copper-arsenic-tin alloys, copper-arsenic-tin artifacts, and probably copper-tin and copper-arsenic bronze artifacts. Earlier evidence had indicated that these bronze alloys were produced exclusively in West Mexico. West Mexico was the region where metallurgy first developed in Mesoamerica, although major elements of that technology had been introduced from the metallurgies of Central and South America. The bronze working component of Huastec metallurgy was transmitted from the metalworking regions of West Mexico, most likely through market systems that distributed Aztec goods. PMID:17742754

  9. Geochemical and hydrologic data for San Marcos Springs recharge characterization near San Marcos, Texas, November 2008--December 2010

    Science.gov (United States)

    Crow, Cassi L.

    2012-01-01

    During 2008–10, the U.S. Geological Survey, in cooperation with the San Antonio Water System, collected geochemical and hydrologic data in Bexar, Comal, and Hays Counties, Texas, to define and characterize the sources of recharge to San Marcos Springs. Precipitation samples were collected for stable isotope analysis at 1 site and water-quality samples were collected at 7 springs, 21 wells, and 9 stream sites in the study area between November 2008 and December 2010. Continuous water-quality monitors were installed in three springs, two wells, and at one stream site. Three continuous stream-gaging stations were installed to measure gage height and a stagedischarge rating was developed at two of the three sites. Depth to water below land surface was continuously measured in two wells.

  10. Bronze and Iron Age sites in Srem and the stratigraphy of Gomolava

    Directory of Open Access Journals (Sweden)

    Tasić Nikola

    2005-01-01

    Full Text Available Systematic excavation at Gomolava conducted almost interruptedly between 1953 and 1985 provided an almost full insight into the human occupation of the southern Pannonian Plain from the Early Neolithic to the successive arrival of Celts and Romans. This fact makes it possible for many of the excavated short-lived or horizontally-stratified settlements to be defined in relation to Gomolava's stratigraphic sequence. As a result, the paper attempts to establish a relative chronology for Bronze and Iron Age sites in the area between the Sava and Danube rivers. By way of illustration, it offers four maps suggesting synchronous developments. Thus Map 1 shows chronological parallelism between the Early Bronze Age layers and late Vučedol and Vinkovci sites (such as Pećine near Vrdnik, or Belegiš, Vojka and Batajnica belonging to the final Eneolithic and Early Bronze, while Map 2 shows synchronisms between Gomolava IVb-c and the Vinkovci layers at the sites of Gradina on the Bosut, Gradac at Belegiš, Petrovaradin Fortress, and Asfaltna Baza on the outskirts of Zemun. The end of the Bronze Age represented by Gomolava IVb1 to IVc is shown to be synchronous with the settlements, necropolises and hoard horizons of an Ha A1 and A2 date. Finally, Early Iron Age sites are easy to fit in with the Srem sites owing to systematic excavations at Gradina on the Bosut near Šid, Kalakača near Beška and numerous hoards of bronze artefacts marking a clear boundary between the Bronze and Early Iron Ages. At Gomolava this transition is reflected in horizons Va to Vd: the earliest is represented by black channeled pottery of the Gava type, while the other three are connected with the evolution of the Bosut-Basarabi complex.

  11. Dynamic characteristics of Great Bronze Buddha of Kamakura using microtremor

    International Nuclear Information System (INIS)

    The second largest bronze Buddha in Japan built in around 1250AD at Kamakura immediately above the focal region of the 1923 Kanto earthquake. Great Buddha of Kamakura has still remained basically its original shape, though it has been suffered several natural disasters as losing its hall. Especially, although the 1703 and 1923 Kanto earthquakes caused settlement and sliding of the basement over 0.3 m., the body has been not suffered serious damage. This statue was casted in order from the bottom with many joints. The joint between the head and the body was noticed because it is reinforced by FRP, Fiber Reinforced Plastic, at the time of the last major repair in 1961. And ingenuity was exercised to fence off the earthquake motion over 400 Gal with sliding the body on the basement, to reduce the load for the neck during earthquake. This is the first example of the earthquake isolation system for cultural properties in Japan. Over 50 years passed after the during earthquake motion, microtremor measurement was conducted. As a result of the primary investigation in 2009, the surrounding ground was estimated that liquefaction was occurred at the front and right sides of the basement and the basement suffered damage as settlement. However, it is considered that the propagation of the earthquake motion for the statue was interrupted because of the liquefaction. Thus, it seems that the damage for the statue itself was prevented because of namely the natural isolation system. Additional y in 2013 microtremor of the statue itself was measured for making clear the connection status between the body and the head.

  12. Spinal arthritis and physical stress at Bronze Age Harappa.

    Science.gov (United States)

    Lovell, N C

    1994-02-01

    This study examines joint changes in the vertebral skeleton in human remains excavated in 1987 and 1988 at Bronze Age Harappa, an urban center of the Indus Valley civilization. The sample consists of 23 complete skeletons from primary burial context, the partial remains of more than 69 other individuals, and hundreds of skeletal elements from secondary context, totalling 3,084 vertebral joint margins and articular surfaces. Marginal bone proliferation, pitting of articular surfaces, eburnation, and ankylosis were scored macroscopically for vertebral body margins and surfaces and posterior apophyseal facet joints. Marginal lipping is far more prevalent on the vertebral bodies than on the apophyseal facets and surface pitting is also more frequent on vertebral bodies although its expression is relatively low overall. Cervical vertebrae in this sample exhibit the same amount of marginal new bone and much more surface pitting of the vertebral bodies than do either thoracic or lumbar vertebrae; the cervical segment also exhibits the most severe expressions of both types of lesions. In addition, although the frequencies of cervical and lumbar posterior facet involvement are similar, the cervical facets exhibit much more severe lipping as well as the only cases of eburnation and ankylosis. Pitting of the posterior facets is most common in the lumbar segment, but the cervical examples are the only severe cases. It is proposed that the severe joint changes in the cervical spine result from trauma, perhaps accumulated microtrauma from activity stresses. There are no age or sex associated patterns in the frequency of arthritis although this result may be influenced by the small proportions of the total sample for which age and sex could be determined. PMID:8147433

  13. Elemental analysis of ancient Chinese bronze artifacts with external-beam PIXE

    International Nuclear Information System (INIS)

    External-beam PIXE has been applied for the determination of the elemental composition of ancient Chinese bronze artifacts. Characteristic x-ray spectra from the samples bombarded with protons of 3 MeV have been measured with a HPGe detector. At each sample three spots were irradiated per run. Results of measurements on three fragments of bronze drinking vessels and helmet of Chinese ancient Chou and Shang dynasties (17th-8th century B.C.) are presented. To check the analytical method, we have also made measurements on the elemental composition of some modern coins. The results are discussed. (author)

  14. Symbolic metal bit and saddlebag fastenings in a Middle Bronze Age donkey burial.

    Directory of Open Access Journals (Sweden)

    Guy Bar-Oz

    Full Text Available Here we report the unprecedented discovery of the skeleton of a ritually interred donkey with a metal horse bit in association with its teeth and saddlebag fastenings on its back. This discovery in the Middle Bronze Age III sacred precinct (1700/1650-1550 BCE at Tel Haror, Israel, presents a unique combination of evidence for the early employment of equid harnessing equipment, both for chariot bridling (horse bit and pack animals (saddlebags. The ritually deposited donkey with its unique accoutrements advances our understanding of the broad social and religious significance of equids in the Levantine Bronze Age, previously known mainly from textual and iconographical sources.

  15. O bronze final na região de Mértola

    OpenAIRE

    BARROS, Pedro de

    2012-01-01

    Mértola fica localizada num local com boa defensibilidade, no final do longo estuário do Rio Guadiana no Sudoeste Peninsular entre uma peneplanicíe e os vales encaixados, onde as linhas de água subsidiárias têm o seu percurso. A ocupação do Bronze Final de Mértola é revelada pela presença de cerâmica com ornatos brunidos, formas cerâmicas manuais, cerâmica frequentemente designada "tipo Carambolo" e um exemplar de foice em bronze do "tipo Rocanes". Apesar de serem poucos os elementos, estes r...

  16. Pressure Effects on Solid State Phase Transformation of Aluminium Bronze in Cooling Process

    Institute of Scientific and Technical Information of China (English)

    WANG Hai-Yan; CHEN Yan; LIU Yu-Wen; LI Fei; LIU Jian-Hua; PENG Gui-Rong; WANG Wen-Kui

    2009-01-01

    Effects of high pressure (6 GPa) on the solid state phase transformation kinetic parameters of aluminum bronze during the cooling process are investigated, based on the measurement and calculation of its solid state phase transformation temperature, duration and activation energy and the observation of its microstructures. The results show that high pressure treatment can reduce the solid phase transformation temperature and activation energy in the cooling process and can shorten the phase transformation duration, which is favorable when forming fine-grained aluminum bronze.

  17. Bronze Age moss fibre garments from Scotland – the jury’s out

    OpenAIRE

    Harris, Susanna; Gleba, Margarita

    2015-01-01

    In the light of recent discoveries of early to middle Bronze Age burials with mats and fibrous material in Scotland, for example at Langwell farm and Forteviot, it was deemed timely to re-evaluate earlier finds of this period, several of which were discovered and initially reported on nearly a century ago. As part of this research it was noted that three Bronze Age finds from the old literature were reported as clothing or shrouds made of hair moss (Polytrichum commune). Three of these are r...

  18. Vegetation reconstruction of Bronze Age by using microscopic structure of charcoals

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    The microscopic structure of charcoals was determined in two sites of Bronze Age, Chifeng area by using the scanning electronic microscope. The results showed that these charcoals are all timbers of Mongolian oak (Quercus mongolica). It has powerful climatic indicative significance. Based on the assemblage of pollen composition, their eco-climatic index and character of community, the vegetation reconstruction of Bronze Age was obtained. The reconstruction showed that the zonal vegetation was Mongolian oak forest and Chinese pine forest in the loess hills in the Chifeng area, which suggested that the climatic condition was warmer and wetter at that time than present time.

  19. Symbolic Metal Bit and Saddlebag Fastenings in a Middle Bronze Age Donkey Burial

    Science.gov (United States)

    Bar-Oz, Guy; Nahshoni, Pirhiya; Motro, Hadas; Oren, Eliezer D.

    2013-01-01

    Here we report the unprecedented discovery of the skeleton of a ritually interred donkey with a metal horse bit in association with its teeth and saddlebag fastenings on its back. This discovery in the Middle Bronze Age III sacred precinct (1700/1650-1550 BCE) at Tel Haror, Israel, presents a unique combination of evidence for the early employment of equid harnessing equipment, both for chariot bridling (horse bit) and pack animals (saddlebags). The ritually deposited donkey with its unique accoutrements advances our understanding of the broad social and religious significance of equids in the Levantine Bronze Age, previously known mainly from textual and iconographical sources. PMID:23484046

  20. Nomadic pastoralism in the Early Bronze Age of the central Balkans evaluation of background knowledge

    Directory of Open Access Journals (Sweden)

    Porčić Marko

    2008-01-01

    Full Text Available The aim of the paper is to examine background knowledge about the orga­nizational properties of mobile pastoral groups in order to assess the likelihood of the existence of pastoral nomads in the Early Bronze Age in the central Balkans. The patterning found by A. L. Johnson (2002 is taken as a point of departure for the cross-cultural analysis conducted in this study. Johnson’s findings are in the main corroborated. Acquired knowledge about the workings of pastoral societies suggests that highly mobile pastoral groups should not be expected in the Early Bronze Age of the central Balkans.

  1. Formation and Oxidation of Hydrogen Molybdenum Bronze on platinum electrode in sulfuric acid solution

    Institute of Scientific and Technical Information of China (English)

    Jin LU; Jun Hua DU; Wei Shan Li; Jia Mo FU

    2004-01-01

    Hydrogen molybdenum bronze (HxMoO3) can be electrodeposited on platinum and oxidized in two steps to the hydrogen molybdenum bronze with less amount of hydrogen HyMoO3 (y

  2. MarcoPolo-R: Mission and Spacecraft Design

    Science.gov (United States)

    Peacocke, L.; Kemble, S.; Chapuy, M.; Scheer, H.

    2013-09-01

    The MarcoPolo-R mission is a candidate for the European Space Agency's medium-class Cosmic Vision programme, with the aim to obtain a 100 g sample of asteroid surface material and return it safely to the Earth. Astrium is one of two industrial contractors currently studying the mission to Phase A level, and the team has been working on the mission and spacecraft design since January 2012. Asteroids are some of the most primitive bodies in our solar system and are key to understanding the formation of the Earth, Sun and other planetary bodies. A returned sample would allow extensive analyses in the large laboratory-sized instruments here on Earth that are not possible with in-situ instruments. This analysis would also increase our understanding of the composition and structure of asteroids, and aid in plans for asteroid deflection techniques. In addition, the mission would be a valuable precursor for missions such as Mars Sample Return, demonstrating a high speed Earth re-entry and hard landing of an entry capsule. Following extensive mission analysis of both the baseline asteroid target 1996 FG3 and alternatives, a particularly favourable trajectory was found to the asteroid 2008 EV5 resulting in a mission duration of 4.5 to 6 years. In October 2012, the MarcoPolo-R baseline target was changed to 2008 EV5 due to its extremely primitive nature, which may pre-date the Sun. This change has a number of advantages: reduced DeltaV requirements, an orbit with a more benign thermal environment, reduced communications distances, and a reduced complexity propulsion system - all of which simplify the spacecraft design significantly. The single spacecraft would launch between 2022 and 2024 on a Soyuz-Fregat launch vehicle from Kourou. Solar electric propulsion is necessary for the outward and return transfers due to the DeltaV requirements, to minimise propellant mass. Once rendezvous with the asteroid is achieved, an observation campaign will begin to characterise the

  3. Archaeological Geophysics at the San Marcos Pueblo, New Mexico, USA

    Science.gov (United States)

    Grimes, K.; Joiner, C. J.; Musa, D.; Allred, I.; Delhaye, R. P.; Zorin, N.; Feucht, D. W.; Johnston, G.; Pellerin, L.; McPhee, D.; Ferguson, J. F.

    2013-12-01

    The students and faculty of the Summer of Applied Geophysical Experience (SAGE) geophysical field course have studied the San Marcos Pueblo (LA 98) since 2004. This activity has provided instruction in near-surface geophysics and research into the application of geophysical techniques to southwestern archaeological problems. Our study site, the San Marcos Pueblo, is a classical and colonial period (1200-1680) pueblo that was once one of the largest communities in the southwest. Previous SAGE publications have discussed the discovery of archaeological features, the underlying geology and hydrological conditions. This study focuses on the interpretation of 'El Mapo Grande', 150 m X 150 m, high-resolution (0.5 m) maps of magnetic and electrical properties and 12 seismic refraction lines. The map covers room block, plaza and midden areas as well as areas where colonial period metallurgical activities were known to have occurred. We acquired magnetic, electromagnetic (EM), and ground-penetrating radar (GPR) data in 30 m X 30 m quads producing geophysical maps of each quad (2 or 3 produced each year). Total magnetic field measurements were made with a Geometrics cesium vapor magnetometer, GPR data collected using a Sensors and Software 250 MHz radar were on 0.5 m spaced lines, and EM data were acquired with a Geonics EM-31 on 1 m spaced lines. Seismic data were collected on interconnected lines with 0.5 m receiver and 3 m source interval. El Mapo Grande shows anomalies correlated among the diverse physical properties that were mapped. The edges of strong magnetic anomalies correlate with areas of high GPR scattering possibly associated with rocky floors under room blocks. Areas of high magnetic response are associated with hill-slope erosion channels and plumes of debris in the plaza to the south that are apparently washing down from the metallurgical sites near room blocks. EM data display a good correlation with the magnetic map. Debris channels and plumes are more

  4. Identidad, escritura, performance: Marco Paolini, actor y autor

    Directory of Open Access Journals (Sweden)

    Simone Soriani

    2016-01-01

    Full Text Available Marco Paolini es uno de los más representativos actores y autores del llamado "teatro di narrazione". El presente artículo pretende acercarse a algunos aspectos centrales de su poética en tanto actor y escritor, tales como los complejos y articulados procesos a través de los cuales llega a un (más o menos definitivo texto escrito; la fuerte relación que establece entre él y su público, a quien Paolini siempre se dirige consciente y explícitamente con gags y "bromas" en ocasiones tomados de la tradición del teatro popular italiano; o el "lenguaje del cuerpo" que Paolini pone en práctica en el escenario y en las páginas de sus libros publicados, en el que (de un modo personal mezcla el italiano, dialectos venecianos y ecos de poetas y escritores de la tradición literaria italiana.

  5. Hacia un marco conceptual para repensar la accesibilidad cultural

    Directory of Open Access Journals (Sweden)

    Fernando Landini

    2014-02-01

    Full Text Available La accesibilidad de la población al sistema de salud constituye una de las principales preocupaciones de las políticas sanitarias. No obstante, son pocos los trabajos que profundizan conceptualmente en dicha noción. La mayor parte de ellos diferencia entre disponibilidad, accesibilidad y aceptabilidad, o entre accesibilidad geográfica, financiera, administrativa y cultural. En el presente trabajo se discute y analiza la noción de accesibilidad, definiéndosela como un proceso de articulación conflictiva entre demanda y oferta en salud. A la vez, se focaliza en la noción de accesibilidad cultural, la cual es repensada como una interfaz social, es decir, como un espacio conflictivo en el que se articulan marcos de sentido diferentes, en este caso el de los profesionales y el de los pacientes. Esto permite abordar los procesos complejos de apropiación, traducción y reconfiguración de los conocimientos y recomendaciones que se dan en este vínculo.

  6. Strangers in a strange land: Egyptians in southern Palestine during the Bronze Age

    Directory of Open Access Journals (Sweden)

    Rachael Sparks

    2002-10-01

    Full Text Available When the Institute of Archaeology was formally established in 1937, it became responsible for housing Sir Flinders Petrie’s collection of archaeological material from Palestine. This unique inheritance has great value as a research collection, as its curator demonstrates here in her discussion of interaction between Egypt and Palestine in the Bronze Age.

  7. La médaille de bronze du CNRS à un physicien clermontois

    CERN Multimedia

    2005-01-01

    Evey year, the National center for scientific research (CNRS), rewards around fifty of searchers at various stages of their career. The bronze medal rewards the first work of a searcher, making of him a specialist in his field; Philippe Crochet was awarded this medal

  8. Celestial Symbolism in Central European Later Prehistory - Case Studies from the Bronze Age Carpathian Basin

    Science.gov (United States)

    Pásztor, Emília

    It is commonly held that the sun played a particularly important cultural role in later prehistoric Europe. The rise of a general European sun cult has even been suggested for the Bronze Age. During this period, the increasing use of special symbols assumed to represent the sun is easily discernible on different types of archaeological finds.

  9. Antibacterial drugs as corrosion inhibitors for bronze surfaces in acidic solutions

    International Nuclear Information System (INIS)

    Graphical abstract: - Highlights: • All four investigated antibacterial drugs act as corrosion inhibitors for bronze surface. • In the presence of antibiotics, a 3RC electric circuit simulates the corrosion system. • The electrochemical results indicate as best inhibitors Doxy, followed by Strepto. • HOMO–LUMO energy gap increases in the order: Doxy > Strepto > Cipro > Amoxi. • The thin protective film on bronze is reinforced by the presence of the antibiotics. - Abstract: The present study is aiming to investigate the effect of four antibiotics (amoxicillin, ciprofloxacin, doxycycline and streptomycin,) belonging to different classes of antibacterial drugs on bronze corrosion in a solution simulating an acid rain (pH 4). Due to their ability to form protective films on the metal surface, the tested antibiotics act as corrosion inhibitors for bronze. The antibiotics were tested at various concentrations in order to determine the optimal concentration range for the best corrosion inhibiting effect. In evaluating the inhibition efficiency, polarization curves, electrochemical impedance spectroscopy, SEM and XPS measurements were used. Moreover, a correlation between the inhibition efficiency of some antibacterial drugs and certain molecular parameters was determined by quantum chemical computations. Parameters like energies EHOMO and ELUMO and HOMO–LUMO energy gap were used for correlation with the corrosion data

  10. Antibacterial drugs as corrosion inhibitors for bronze surfaces in acidic solutions

    Energy Technology Data Exchange (ETDEWEB)

    Rotaru, Ileana [Department of Chemical Engineering, “Babes-Bolyai” University, 11 Arany-Janos St., 400028 Cluj-Napoca (Romania); Varvara, Simona, E-mail: svarvara@uab.ro [Department of Exact Sciences and Engineering, “1 Decembrie 1918” University, 11-13 Nicolae Iorga St., 510009 Alba Iulia (Romania); Gaina, Luiza [Department of Chemical Engineering, “Babes-Bolyai” University, 11 Arany-Janos St., 400028 Cluj-Napoca (Romania); Muresan, Liana Maria, E-mail: limur@chem.ubbcluj.ro [Department of Chemical Engineering, “Babes-Bolyai” University, 11 Arany-Janos St., 400028 Cluj-Napoca (Romania)

    2014-12-01

    Graphical abstract: - Highlights: • All four investigated antibacterial drugs act as corrosion inhibitors for bronze surface. • In the presence of antibiotics, a 3RC electric circuit simulates the corrosion system. • The electrochemical results indicate as best inhibitors Doxy, followed by Strepto. • HOMO–LUMO energy gap increases in the order: Doxy > Strepto > Cipro > Amoxi. • The thin protective film on bronze is reinforced by the presence of the antibiotics. - Abstract: The present study is aiming to investigate the effect of four antibiotics (amoxicillin, ciprofloxacin, doxycycline and streptomycin,) belonging to different classes of antibacterial drugs on bronze corrosion in a solution simulating an acid rain (pH 4). Due to their ability to form protective films on the metal surface, the tested antibiotics act as corrosion inhibitors for bronze. The antibiotics were tested at various concentrations in order to determine the optimal concentration range for the best corrosion inhibiting effect. In evaluating the inhibition efficiency, polarization curves, electrochemical impedance spectroscopy, SEM and XPS measurements were used. Moreover, a correlation between the inhibition efficiency of some antibacterial drugs and certain molecular parameters was determined by quantum chemical computations. Parameters like energies E{sub HOMO} and E{sub LUMO} and HOMO–LUMO energy gap were used for correlation with the corrosion data.

  11. Protection of bronze artefacts through polymeric coatings based on nanocarriers filled with corrosion inhibitors

    Science.gov (United States)

    de Luna, Martina Salzano; Buonocore, Giovanna; Di Carlo, Gabriella; Giuliani, Chiara; Ingo, Gabriel M.; Lavorgna, Marino

    2016-05-01

    Protective coatings based on polymers synthesized from renewable sources (chitosan or an amorphous vinyl alcohol based polymer) have been prepared for the protection of bronze artifacts from corrosion. Besides acting as an effective barrier against corrosive species present in the environment, the efficiency of the coatings has been improved by adding corrosion inhibitor compounds (benzotriazole or mercaptobenzothiazole) to the formulations. The liquid medium of the formulations has been carefully selected looking at maximizing the wettability on the bronze substrate and optimizing the solvent evaporation rate. The minimum amount of inhibitor compounds has been optimized by performing accelerated corrosion tests on coated bronze substrates. The inhibitors have been directly dissolved in the coating-forming solutions and/or introduced by means of nanocarriers, which allow to control the release kinetics. The free dissolved inhibitor molecules immediately provide a sufficient protection against corrosion. On the other hand, the inhibitor molecules contained in the nanocarriers serve as long-term reservoir, which can be activated by external corrosion-related stimuli in case of particularly severe conditions. Particular attention has been paid to other features which affect the coating performances. Specifically, the adhesion of the protective polymer layer to the bronze substrate has been assessed, as well as its permeability properties and transparency, the latter being a fundamental feature of protective coating for cultural heritages. Finally, the protective efficiency of the produced smart coatings has been assessed through accelerated corrosion tests.

  12. The Agro Pontino region, refuge after the Early Bronze Age Avellino eruption of Mount Vesuvius, Italy?

    NARCIS (Netherlands)

    C. Bakels; J. Sevink; W. Kuijper; H. Kamermans

    2015-01-01

    In recent years it was discovered that the Middle to Late Holocene infi ll of the Agro Pontino graben (Central Italy) held a tephra layer originating from the Avellino eruption of the Vesuvius volcano. The eruption is dated to 1995 ± 10 calBC and took therefore place during the Early Bronze Age. Thi

  13. Corrosion investigation of fire-gilded bronze involving high surface resolution spectroscopic imaging

    Science.gov (United States)

    Masi, G.; Chiavari, C.; Avila, J.; Esvan, J.; Raffo, S.; Bignozzi, M. C.; Asensio, M. C.; Robbiola, L.; Martini, C.

    2016-03-01

    Gilded bronzes are often affected by severe corrosion, due to defects in the Au layer and Au/Cu alloy galvanic coupling, stimulated by large cathodic area of the gilded layer. Galvanic corrosion, triggered by gilding defects, leads to products growth at the Au/bronze interface, inducing blistering or break-up of the Au layer. In this context, fire-gilded bronze replicas prepared by ancient methods (use of spreadable Au-Hg paste) was specifically characterised by compiling complementary spectroscopic and imaging information before/after accelerated ageing with synthetic rain. Fire-gilded bronze samples were chemically imaged in cross-section at nano-metric scale (XPS). We have found a net surface enrichment in Zn and Sn after fire-gilding and presence of metallic Hg, Pb and Cu within the Au layer. Moreover, the composition distribution of the elements together with their oxidation has been determined. It was also revealed that metallic phases including Hg and Pb remain in the gilding after corrosion. Moreover, selective dissolution of Zn and Cu occurs in the crater due to galvanic coupling, which locally induces relative Sn species enrichment (decuprification). The feasibility advantages and disadvantages of chemical imaging using HR-SRPES to study artworks have been investigated on representative replicas.

  14. The study of bronze statuettes with the help of neutron-imaging techniques

    NARCIS (Netherlands)

    Van Langh, R.; Lehmann, E.; Hartmann, S.; Kaestner, A.; Scholten, F.

    2009-01-01

    Until recently fabrication techniques of Renaissance bronzes have been studied only with the naked eye, microscopically, videoscopically and with X-radiography. These techniques provide information on production techniques, yet much important detail remains unclear. As part of an interdisciplinary s

  15. Electrodeposition and corrosion resistance of nanocrystalline white bronze (CuSn) coatings

    NARCIS (Netherlands)

    Hovestad, A.; Lekka, M.; Willemsen, R.M.R.; Tacken, R.A.; Bonora, P.L.

    2008-01-01

    For jewellery applications electroplated white bronze (CuSn) was investigated as undercoating for noble metal finishes as alternative to nickel. A strongly acidic plating bath was developed with an organic additive to suppress hydrogen evolution and obtain bright coatings. An electrochemical study o

  16. Isotopic dietary reconstruction of humans from Middle Bronze Age Lerna, Argolid, Greece

    NARCIS (Netherlands)

    Triantaphyllou, S.; Richards, M. P.; Zerner, C.; Voutsaki, S.

    2008-01-01

    This study presents the results of a carbon and nitrogen stable isotope analysis of 39 human bone and 8 animal samples from Middle Bronze Age (or Middle Helladic, MH, ca. 2100-1700 BC) Lerna, Greece. The isotopic data indicate that the humans had a C-3 terrestrial diet while certain individuals appe

  17. Dating Archaeological Copper/Bronze Artifacts by Using the Voltammetry of Microparticles

    OpenAIRE

    Doménech-Carbó, Antonio; Doménech-Carbó, Maria Teresa; Capelo, Sofia; Pasíes, Trinidad; Martínez-Lázaro, Isabel

    2014-01-01

    A method for dating copper/bronze archaeological objects aged in atmospheric environments is proposed based on the specific signals for cuprite and tenorite corrosion products measured through the voltammtry of microparticles method. The tenorite/cuprite ratio increased with the corrosion time and fitted to a potential law that yielded a calibration curve usable for dating purposes.

  18. Cold Spraying of Cu-Al-Bronze for Cavitation Protection in Marine Environments

    Science.gov (United States)

    Krebs, S.; Gärtner, F.; Klassen, T.

    2015-01-01

    Traveling at high speeds, ships have to face the problem of rudder cavitation-erosion. At present, the problem is countered by fluid dynamically optimized rudders, synthetic, and weld-cladded coatings on steel basis. Nevertheless, docking and repair is required after certain intervals. Bulk Cu-Al-bronzes are in use at ships propellers to withstand corrosion and cavitation. Deposited as coatings with bulk-like properties, such bronzes could also enhance rudder life times. The present study investigates the coating formation by cold spraying CuAl10Fe5Ni5 bronze powders. By calculations of the impact conditions, the range of optimum spray parameters was preselected in terms of the coating quality parameter η on steel substrates with different temperatures. As-atomized and annealed powders were compared to optimize cavitation resistance of the coatings. Results provide insights about the interplay between the mechanical properties of powder and substrate for coating formation. Single particle impact morphologies visualize the deformation behavior. Coating performance was assessed by analyzing microstructures, bond strength, and cavitation resistance. These first results demonstrate that cold-sprayed bronze coatings have a high potential for ensuring a good performances in rudder protection. With further optimization, such coatings could evolve towards a competitive alternative to existing anti-cavitation procedures.

  19. Randomised controlled trials of staged teaching for basic life support. 1. Skill acquisition at bronze stage.

    Science.gov (United States)

    Assar, D; Chamberlain, D; Colquhoun, M; Donnelly, P; Handley, A J; Leaves, S; Kern, K B

    2000-06-01

    We have investigated a method of teaching community CPR in three stages instead of in a single session. These have been designated bronze, silver, and gold stages. The first involves only opening of the airway and chest compression with back blows for choking, the second adds ventilation in a ratio of compressions to breaths of 50:5, and the third is a conversion to conventional CPR. In a controlled randomised trial of 495 trainees we compared the performance in tests immediately after instruction of those who had received a conventional course and those who had had the simpler bronze level tuition. The tests were based on video recordings of simulated resuscitation scenarios and the readouts from recording manikins. Differences occurred as a direct consequence of ventilation being required in one group and not the other, some variation probably followed from unforeseen minor changes in the way that instruction was given, whilst others may have followed from the greater simplicity in the new method of training. A careful approach was followed by slightly more trainees in the conventional group whilst appreciably more in the bronze group remembered to shout for help (44% vs. 71%). A clear advantage was also seen for bronze level training in terms of those who opened the airway as taught (35% vs. 56%), for checking breathing (66% vs. 88%), and for mentioning the need to phone for an ambulance (21% vs. 32%). Little difference was observed in correct or acceptable hand position between the conventional group who were given detailed guidance and the bronze group who were instructed only to push on the centre of the chest. The biggest differences related to the number of compressions given. The mean delay to first compression was 63 s and 34 s, and the mean duration of pauses between compressions was 16 s and 9 s, respectively. Average performed rates were similar in the two groups, but more in the conventional group compressed too slowly whereas more in the bronze group

  20. Grain refinement of bronze alloy by equal-channel angular pressing (ECAP and its effect on corrosion behaviour

    Directory of Open Access Journals (Sweden)

    M.M. Sadawy

    2016-08-01

    Full Text Available The corrosion behaviour of bronze alloy prepared by equal channel angular pressing (ECAP was investigated in 3.5 wt. % NaCl solution. Immersion corrosion tests and different electrochemical techniques were carried out. The results showed that ECAPed bronze samples exhibited higher corrosion resistance compared with the as-cast alloy and the passive current density decreased with increasing number of passes. Moreover, the morphology of alloys indicated that the corrosion damage on the surface of ECAPed bronze was smooth and uniform while the as-cast alloy suffered from selective corrosion.

  1. Selection of the temperature of casting the bronzes to plaster moulds

    Directory of Open Access Journals (Sweden)

    B. Pisarek

    2009-07-01

    Full Text Available The results of the investigations of the process of solidification of the bronze CuSn5Zn5Pb5-C (B555 and CuSn10-C (B10 in the hot plaster mould show in the work. For four temperatures of casting: 1200 ° C, 1180 ° C, 1160 ° C and 1140 ° C was conducted the investi-gation: the size of contraction cavity, the fulfillment of the mould cavity formative the casts of test slats about the thickness: 4 mm, 0,8 mm and 0,5 mm. It was conducted the investigation the processes sets in the arrangement the cast-mould and X-ray analysis phase XRD of compound coming into being in indirect layer created among mould and cast in the result of the thermal decomposition of the anhy-drite. It results that the temperature 1140 ° C is the optimum temperature of casting the bronze to hot plaster mould from carried out investiga-tions. The minimum thickness of the wall of the cast from the bronze B555 is 0.5 mm, and from the bronze B10 0.8 mm.The realization of casts about thinner walls is made difficult because of giving off formed gases in the result of the thermal decomposition of the anhydrite. The products of the decomposition of the anhydrite react with elements steps in the chemical composition of studied bronzes, create in the arrangement the cast-mould the indirect layer folded from: sulphites, sulphides, oxides and clean metals (Pb or their compounds, especially Sn and Sb.

  2. Chemical bath deposition and characterization of electrochromic thin films of sodium vanadium bronzes

    Energy Technology Data Exchange (ETDEWEB)

    Najdoski, Metodija, E-mail: metonajd@yahoo.com [Institute of Chemistry, Faculty of Natural Sciences and Mathematics, Sts. Cyril and Methodius University, POB 162, Arhimedova 5, 1000 Skopje, Republic of Macedonia (Macedonia, The Former Yugoslav Republic of); Koleva, Violeta [Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia (Bulgaria); Demiri, Sani [Institute of Chemistry, Faculty of Natural Sciences and Mathematics, Sts. Cyril and Methodius University, POB 162, Arhimedova 5, 1000 Skopje, Republic of Macedonia (Macedonia, The Former Yugoslav Republic of)

    2012-03-15

    Highlights: Black-Right-Pointing-Pointer We report a new chemical bath method for the deposition of vanadium bronze thin films. Black-Right-Pointing-Pointer The films are phase mixture of NaV{sub 6}O{sub 15} and Na{sub 1.1}V{sub 3}O{sub 7.9} with 10.58% lattice water. Black-Right-Pointing-Pointer The as-deposited vanadium bronze films exhibit two-step electrochromism. Black-Right-Pointing-Pointer They change their yellow-orange color to green and then from green to blue color. Black-Right-Pointing-Pointer The method allows the preparation of films on substrates with low melting point. -- Abstract: Thin yellow-orange films of sodium vanadium oxide bronzes have been prepared from a sodium-vanadium solution (1:1) at 75 Degree-Sign C and pH = 3. The composition, structure and morphology of the films have been studied by XRD, IR spectroscopy, TG and SEM-EDX analyses. It has been established that the prepared films are a phase mixture of hydrated NaV{sub 6}O{sub 15} (predominant component) and Na{sub 1.1}V{sub 3}O{sub 7.9} with total water content of 10.58%. The sodium vanadium bronze thin films exhibit two-step electrochromism followed by color change from yellow-orange to green, and then from green to blue. The cyclic voltammetry measurements on the as-deposited and annealed vanadium bronze films reveal the existence of different oxidation/reduction vanadium sites which make these films suitable for electrochromic devices. The annealing of the films at 400 Degree-Sign C changes the composition, optical and electrochemical properties.

  3. Chemical bath deposition and characterization of electrochromic thin films of sodium vanadium bronzes

    International Nuclear Information System (INIS)

    Highlights: ► We report a new chemical bath method for the deposition of vanadium bronze thin films. ► The films are phase mixture of NaV6O15 and Na1.1V3O7.9 with 10.58% lattice water. ► The as-deposited vanadium bronze films exhibit two-step electrochromism. ► They change their yellow-orange color to green and then from green to blue color. ► The method allows the preparation of films on substrates with low melting point. -- Abstract: Thin yellow-orange films of sodium vanadium oxide bronzes have been prepared from a sodium–vanadium solution (1:1) at 75 °C and pH = 3. The composition, structure and morphology of the films have been studied by XRD, IR spectroscopy, TG and SEM–EDX analyses. It has been established that the prepared films are a phase mixture of hydrated NaV6O15 (predominant component) and Na1.1V3O7.9 with total water content of 10.58%. The sodium vanadium bronze thin films exhibit two-step electrochromism followed by color change from yellow-orange to green, and then from green to blue. The cyclic voltammetry measurements on the as-deposited and annealed vanadium bronze films reveal the existence of different oxidation/reduction vanadium sites which make these films suitable for electrochromic devices. The annealing of the films at 400 °C changes the composition, optical and electrochemical properties

  4. Kinkaleri : teater peab tekitama küsimuse, mitte andma vastuse / Marco Mazzoni ; interv. Andres Keil

    Index Scriptorium Estoniae

    Mazzoni, Marco

    2008-01-01

    1995. a. Itaalias asutatud kuuest kunstnikust - Matteo Bambi, Luca Camilletti, Massimo Conti, Marco Mazzoni, Gina Monaco ja Cristina Rizzo - koosnevast eksperimentaalteatrist Kinkaleri ja Kanuti Gildi saalis 7. ja 8. nov. esiettekandele tulevast lavastusest "Yes, Sir!"

  5. Role of Lysosomes in Silica-Induced Inflammasome Activation and Inflammation in Absence of MARCO

    Directory of Open Access Journals (Sweden)

    Rupa Biswas

    2014-01-01

    Full Text Available MARCO is the predominant scavenger receptor for recognition and binding of silica particles by alveolar macrophages (AM. Previously, it was shown that mice null for MARCO have a greater inflammatory response to silica, but the mechanism was not described. The aim of this study was to determine the relationship between MARCO and NLRP3 inflammasome activity. Silica increased NLRP3 inflammasome activation and release of the proinflammatory cytokine, IL-1β, to a greater extent in MARCO−/− AM compared to wild type (WT AM. Furthermore, in MARCO−/− AM there was greater cathepsin B release from phagolysosomes, Caspase-1 activation, and acid sphingomyelinase activity compared to WT AM, supporting the critical role played by lysosomal membrane permeabilization (LMP in triggering silica-induced inflammation. The difference in sensitivity to LMP appears to be in cholesterol recycling since increasing cholesterol in AM by treatment with U18666A decreased silica-induced NLRP3 inflammasome activation, and cells lacking MARCO were less able to sequester cholesterol following silica treatment. Taken together, these results demonstrate that MARCO contributes to normal cholesterol uptake in macrophages; therefore, in the absence of MARCO, macrophages are more susceptible to a greater inflammatory response by particulates known to cause NLRP3 inflammasome activation and the effect is due to increased LMP.

  6. Fundo Nacional da Assistência Social: da teoria à prática social

    Directory of Open Access Journals (Sweden)

    Pinheiro, Lessí Inês Farias

    2005-01-01

    Full Text Available O presente artigo tem por escopo analisar o financiamento da assistência social no contexto dos ajustes fiscais realizados no Brasil no período 1990-2003. Para tanto, inicialmente, explicita-se o marco político-legal da política de Assistência Social. A seguir, é analisada a execução orçamentária do Fundo Nacional da Assistência Social desde a sua criação até 2003

  7. Sciades herzbergii oxidative stress biomarkers: an in situ study of an estuarine ecosystem (São Marcos' Bay, Maranhão, Brazil

    Directory of Open Access Journals (Sweden)

    Raimunda Nonata Fortes Carvalho-Neta

    2010-01-01

    Full Text Available In order to study the effects of environmental contamination on wild fish, sites were sampled in São Marcos' Bay. The first is located near the ALUMAR/ALCOA port, a potentially contaminated area. The second, located near the Coqueiro beach, was used as a reference area. The activity of antioxidant defence catalase (CAT and glutathione S-transferase (GST in S. herzbergii was compared with the biometric data and gonadosomatic index (GSI. The result showed that GSI decreased significantly in females (pO objetivo desse trabalho foi estudar os efeitos da contaminação ambiental em peixes amostrados em dois locais da Baía de São Marcos. O primeiro ponto está localizado próximo ao porto da ALUMAR/ALCOA, considerado como uma área potencialmente contaminada. O segundo ponto, situado na praia do Coqueiro, foi usado como uma área de referência. Dados da atividade da enzima de defesa antioxidante catalase (CAT e da glutationa S-transferase (GST em S. herzbergii foram comparados com os dados biométricos e o índice gonadossomático (GSI. Resultados mostraram que o GSI diminuiu significativamente em fêmeas (p <0.05 no local contaminado. A atividade da CAT foi mais alta nos peixes do local contaminado. Uma diferença significativa foi observada na atividade de GST de S. herzbergii no local contaminado e no local de referência (p <0.05. GSI possibilitou uma nova abordagem quanto à natureza da resposta de destoxificação nessa espécie de bagre porque este índice não apresentou correlação com as enzimas no local potencialmente contaminado, mas apresentou no local de referência. Assim, sugere-se que a boa correlação da GST/CAT e GSI poderia estar relacionada à reprodução dos animais no local de referência, mas não no local potencialmente contaminado. Se esse for o caso, pode-se concluir que GST/CAT e GSI podem ser utilizados como bons biomarcadores para avaliar contaminação aquática.

  8. Preliminary Study of Corrosion Status on Bronzes Excavated from Qin Dynasty Tombs at Xinfeng Town in China

    Directory of Open Access Journals (Sweden)

    Qian-li Fu

    2012-01-01

    Full Text Available From 2007 to 2008, many bronze wares of Qin Dynasty were excavated from tombs at Xinfeng town. Being an important finding, these bronze wares attracted people’s attention, especially for their conservation. Therefore, the corrosive products were explored by using Scanning Electron Microscope with Energy Dispersive X-ray Detector (SEM/EDS, X-Ray diffraction (XRD, and Raman spectroscopy (RM, which provided much valuable information on the conservation of these bronze wares. According to tested results, the corrosive products of bronzes were found to be comprised of cuprite (Cu2O, covellite (CuS, lead carbonate (PbCO3, and malachite (CuCO3·Cu(OH2. Meantime, the multilayer corrosive structure was found in some samples due to the cracks in Cu2O layer which had formed many microchannels to promote the material migration.

  9. Da escuridão para a luz: origem e extensão da Bíblia em braille no Brasil. Dissertação

    Directory of Open Access Journals (Sweden)

    Marcos Adriano Lovera

    2013-12-01

    Full Text Available LOVERA, Marcos Adriano. Da escuridão para a luz: origem e extensão da Bíblia em braille no Brasil. Dissertação (Mestrado 2013. 176p. - Pontifícia Universidade Católica de Minas Gerais, Programa de Pós-graduação em Ciências da Religião, Belo Horizonte

  10. Grain refinement of bronze alloy by equal-channel angular pressing (ECAP) and its effect on corrosion behaviour

    OpenAIRE

    M.M. Sadawy; Ghanem, M

    2016-01-01

    The corrosion behaviour of bronze alloy prepared by equal channel angular pressing (ECAP) was investigated in 3.5 wt. % NaCl solution. Immersion corrosion tests and different electrochemical techniques were carried out. The results showed that ECAPed bronze samples exhibited higher corrosion resistance compared with the as-cast alloy and the passive current density decreased with increasing number of passes. Moreover, the morphology of alloys indicated that the corrosion damage on the surface...

  11. Characterisation of passive layers of bronze patinas (Cu-Sn alloys) in relation with the tin content of the alloy

    OpenAIRE

    Robbiola, Luc; Fiaud, C.; Harch, A.

    1993-01-01

    International audience In order to develop our knowledge of the relations between the high degree of protectiveness of passive layers and their composition, corroded archaeological bronzes of Bronze Age (1500-950 BC) have been characterised by different methods of analysis. Results reveal that the passive layers have a bilayer structure and are due to the selective dissolution of copper from the copper solid solution of the alloy to the electrolyte. For all of the objects, the ratio [(Sn/C...

  12. Habitabilidad de la vivienda de interés social prioritaria en el marco de la cultura. Reasentamiento de comunidades negras de Vallejuelos a Mirador de Calasanz en Medellín, Colombia. Habitability of the priority-affordable housing within the framework of culture. Resettlement of black communities from Vallejuelos to Mirador de Calasanz in Medellin, Colombia. Habitabilidade na habitação social prioritário no quadro da cultura. Reassentamento de comunidades pretas de Vallejuelos em Mirador de Calasanz em Medellín, Colômbia.

    Directory of Open Access Journals (Sweden)

    Elvia Marina Mena Romaña

    2011-07-01

    solutions built by the municipal administration in the context of public housing policy in Medellin. Methodologically, Mirador de Calazans was taken as a case study that characterizes the vast majority of the projects developed since 2001 to date, especially those built in the Pajarito Macroproject (northwest of Medellin. The method is qualitative and part of an ethnographic approach, which was conducted from life stories and general comments. The interest of this article explains the pervasiveness of this type of construction, lack of social responsibility when running housing, restrictive living conditions in the population and loss of identity that is generated in the different social groups. A moradia é habitada por diferentes pessoas e culturas que elas próprias implantam, pois a cultura é parte das suas vidas, fornecem identidade para os moradores e mesmo são transmitidas às moradias. Portanto, o modelo estandardizado implementado nas moradias chamadas de interesse prioritário (VIP, especificamente aquele desenhado para reassentamento de população, é uma limitante física que choca nos padrões culturais da população e gera conflitos associados à convivência. Neste artigo, indaga-se pela complexidade de morar em soluções habitacionais construídas pela administração municipal no marco da política pública de habitação de Medellín. Metodologicamente, o caso de estudo foi o Mirador de Calasanz, por caracterizar a maior parte dos projetos desenvolvidos desde 2001 até hoje, especialmente aqueles construídos no Macroprojeto de Pajarito (zona noroeste de Medellín. O método for qualitativo e parte duma perspectiva etnográfica, no qual foram realizadas entrevistas abertas, historias de vida e observação geral. O interesse deste artigo é explicado na propagação massiva deste tipo de edificações, falta de responsabilidade social na hora de construir moradias, condições restritivas em que as pessoas moram e a perda de identidade gerada nas

  13. Wet and dry accelerated aging tests in a spray chamber to understand the effects of acid rain frequencies on bronze corrosion

    OpenAIRE

    Gianni, Liliana; Cavallini, Mauro; Natali, Stefano; Adriaens, Annemie

    2013-01-01

    We have conducted controlled laboratory experiments using a series of bronze alloys exposed to frequent, repeated wet and dry cycles, to simulate frequent acid rain exposure and study the resultant corrosion processes in bronze artifacts exposed to an outdoor urban environment. To simulate rainwater and condensation, a spray chamber for the corrosion tests was assembled, which delivered homogeneous vapor diffusion and drop deposition. Three bi-component bronzes, with 3%, 7% and 20% tin conten...

  14. Marks of heliacal rising of Sirius on the sundial of the Bronze Age

    CERN Document Server

    Vodolazhskaya, Larisa N; Nevsky, Mikhail Yu

    2015-01-01

    The article presents the results of interdisciplinary research made with the help of archaeological, physical and astronomical methods. The aim of the study were analysis and interpretation corolla marks of the vessel of the Late Bronze Age, belonging to Srubna culture and which was found near the Staropetrovsky village in the northeast of the Donetsk region (Central Donbass). Performed calculations and measurements revealed that the marks on the corolla of Staropetrovsky vessel are marking of horizontal sundial with a sloping gnomon. Several marks on the corolla of the vessel have star shape. Astronomical calculations show that their position on the corolla, as on "dial" of watch, indicates the time of qualitative change the visibility of Sirius in the day its heliacal rising and the next few days in the Late Bronze Age at the latitude of detection of Staropetrovsky vessel. Published in the article the results of astronomical calculations allow to state that astronomical year in the Srubna tradition began wi...

  15. Chronology for the Aegean Late Bronze Age 1700-1400 B.C.

    Science.gov (United States)

    Manning, Sturt W; Ramsey, Christopher Bronk; Kutschera, Walter; Higham, Thomas; Kromer, Bernd; Steier, Peter; Wild, Eva M

    2006-04-28

    Radiocarbon (carbon-14) data from the Aegean Bronze Age 1700-1400 B.C. show that the Santorini (Thera) eruption must have occurred in the late 17th century B.C. By using carbon-14 dates from the surrounding region, cultural phases, and Bayesian statistical analysis, we established a chronology for the initial Aegean Late Bronze Age cultural phases (Late Minoan IA, IB, and II). This chronology contrasts with conventional archaeological dates and cultural synthesis: stretching out the Late Minoan IA, IB, and II phases by approximately 100 years and requiring reassessment of standard interpretations of associations between the Egyptian and Near Eastern historical dates and phases and those in the Aegean and Cyprus in the mid-second millennium B.C. PMID:16645092

  16. DIFFUSION COUPLE BETWEEN HIGH STRENGTH WEAR-RESISTING ALUMINUM BRONZE AND MACHINING TOOLS MATERIALS

    Institute of Scientific and Technical Information of China (English)

    1999-01-01

    Diffusion couples of tool materials (prepared from commercially available high speed steel and YW1 carbide tools) and the wear-resisting aluminum bronze (KK) were prepared by casting to study the diffusion pattern and phase formation sequence in order to clarify the diffusion wear of the tools during the turning of the wear-resisting aluminum bronze. Optical micrographs show that good contact was obtained at the tool material-KK interface. After annealed at 900 ℃ for 6 h, strong inter-diffusion across the interface was observed. Microprobe analysis was used to study the elemental distribution across the interface and X-ray diffractometry was used to study the phases formed at the interface.

  17. Biological affinities and adaptations of Bronze Age Bactrians: III. An initial craniometric assessment.

    Science.gov (United States)

    Hemphill, B E

    1998-07-01

    Discovery of a previously unknown Bronze Age civilization (Oxus Civilization) centered on the oases of Central Asia immediately raised questions concerning the origin and interregional impacts of this civilization. Fifteen craniometric variables from 12 Bronze Age samples--encompassing 544 adults from Central Asia, Iran, the Indus Valley, and Anatolia--are compared to test which, if any, of the current hypotheses offered by archaeologists are best supported by the pattern of phenetic affinities possessed by the Oxus Civilization inhabitants of the north Bactrian oasis. Craniometric differences between samples are compared with Mahalanobis generalized distance, and patterns of phenetic affinity are assessed with two types of cluster analysis (WPGMA, neighbor-joining method), multidimensional scaling, and principal coordinates analysis. Results obtained by this analysis indicate that current hypotheses for both the origin and interregional impacts of Oxus Civilization populations are incomplete. PMID:9696149

  18. Studies on bronze pre-monetary signs found in Dobroudja using XRF and micro-PIXE

    Science.gov (United States)

    Constantinescu, B.; Cristea-Stan, D.; Talmatchi, G.; Ceccato, D.

    2016-03-01

    We performed compositional analyses on 180 Scythian-type arrowheads and pre-monetary signs using XRF method and on 60 small fragments of such items (approx. 100 microns diameter), sampling being performed on previously corrosion-cleaned areas on their surface, using micro-PIXE. The items are found in Dobroudja, Istros-Histria region. The most relevant for numismatists result is that for each finding place the same type of alloy was used both for fighting arrowheads and for pre-monetary signs. Our analyses revealed three types of alloys: Cu-Sn-Pb ("normal" bronze), Cu-Sn-Mn-Pb and Cu-Sn-Sb-Pb. The presence of antimony suggests the use of fahlore-type poly-metals deposits, most probably from Caucasus Mountains. The problem of ancient bronze containing manganese is more complicated; an explanation could be the use of manganese oxides as flux necessary to smelt oxidized ores.

  19. Radiocarbon dating of ancient bronze statues: Preliminary results from the Riace statues

    Energy Technology Data Exchange (ETDEWEB)

    Calcagnile, L., E-mail: lucio.calcagnile@unile.i [CEDAD, Department of Innovation Engineering, University of Salento, Via per Monteroni, 73100 Lecce (Italy); D' Elia, M.; Quarta, G. [CEDAD, Department of Innovation Engineering, University of Salento, Via per Monteroni, 73100 Lecce (Italy); Vidale, M. [Istituto Centrale per il Restauro, Piazza San Francesco di Paola, 9, 00184 Rome (Italy)

    2010-04-15

    The low amount of material needed for the measurements makes AMS radiocarbon a technique suitable for the dating of ancient bronze artefacts through the analysis of the organic residues contained into the casting cores. We present the results of the AMS radiocarbon dating analyses carried out on the organic remains extracted from the casting cores of the Riace bronzes, among the most famous and well preserved sculptures of the Greek-Classical period. Although different dating hypotheses have been suggested on the base of stylistic considerations, no conclusive answers are, so far, available. The sample selection and preparation protocols of the different kind of organic materials (charred wood, vegetal remains and animal hairs) are described as well as the interpretation of the results in the frame of the current dating hypotheses and available analytical information about the casting technology.

  20. Comparative modeling of Bronze Age land use in the Malatya Plain (Turkey)

    Science.gov (United States)

    Arıkan, Bülent; Restelli, Francesca Balossi; Masi, Alessia

    2016-03-01

    Computational modeling in archeology has proven to be a useful tool in quantifying changes in the paleoenvironment. This especially useful method combines data from diverse disciplines to answer questions focusing on the complex and non-linear aspects of human-environment interactions. The research presented here uses various proxy records to compare the changes in climate during the Bronze Age in the Malatya Plain in eastern Anatolia, which is situated at the northern extremity of northern Mesopotamia. Extensive agropastoral land use modeling was applied to three sites of different size and function in the Malatya Plain during the Early Bronze Age I period to simulate the varying scale and intensity of human impacts in relation to changes in the level of social organization, demography, and temporal length. The results suggest that even in land use types subjected to a light footprint, the scale and intensity of anthropogenic impacts change significantly in relation to the level of social organization.

  1. Connections: the relationships between Neolithic and Bronze Age Megalithic Astronomy in Britain

    CERN Document Server

    Higginbottom, Gail

    2015-01-01

    It has already been empirically verified that for many Bronze Age monuments erected in Scotland between 1400-900 BC, there was a concerted effort on behalf of the builders to align their monuments to astronomical bodies on the horizon. It has also been found that there are two common sets of complex landscape and astronomical patternings, combining specific horizon qualities, like distance and elevation, with the rising and setting points of particular astronomical phenomena. However, it has only been very recently demonstrated by us that that the visible astronomical-landscape variables found at Bronze Age sites on the inner isles and mainland of western Scotland were first established nearly two millennia earlier, with the erection of the mooted first standing-stone 'great circles' in Britain: Callanish and Stenness of Scotland (see G. Higginbottom and R. Clay, The Origins of Standing Stone Astronomy in Britain submitted to Journal of Archaeological Science & available on ArXiv). In the current paper we...

  2. Neolithic and Bronze Age migration to Ireland and establishment of the insular Atlantic genome.

    Science.gov (United States)

    Cassidy, Lara M; Martiniano, Rui; Murphy, Eileen M; Teasdale, Matthew D; Mallory, James; Hartwell, Barrie; Bradley, Daniel G

    2016-01-12

    The Neolithic and Bronze Age transitions were profound cultural shifts catalyzed in parts of Europe by migrations, first of early farmers from the Near East and then Bronze Age herders from the Pontic Steppe. However, a decades-long, unresolved controversy is whether population change or cultural adoption occurred at the Atlantic edge, within the British Isles. We address this issue by using the first whole genome data from prehistoric Irish individuals. A Neolithic woman (3343-3020 cal BC) from a megalithic burial (10.3× coverage) possessed a genome of predominantly Near Eastern origin. She had some hunter-gatherer ancestry but belonged to a population of large effective size, suggesting a substantial influx of early farmers to the island. Three Bronze Age individuals from Rathlin Island (2026-1534 cal BC), including one high coverage (10.5×) genome, showed substantial Steppe genetic heritage indicating that the European population upheavals of the third millennium manifested all of the way from southern Siberia to the western ocean. This turnover invites the possibility of accompanying introduction of Indo-European, perhaps early Celtic, language. Irish Bronze Age haplotypic similarity is strongest within modern Irish, Scottish, and Welsh populations, and several important genetic variants that today show maximal or very high frequencies in Ireland appear at this horizon. These include those coding for lactase persistence, blue eye color, Y chromosome R1b haplotypes, and the hemochromatosis C282Y allele; to our knowledge, the first detection of a known Mendelian disease variant in prehistory. These findings together suggest the establishment of central attributes of the Irish genome 4,000 y ago. PMID:26712024

  3. Computed Tomography and Computed Radiography of late Bronze Age Cremation Urns from Denmark

    DEFF Research Database (Denmark)

    Harvig, Lise Lock; Lynnerup, Niels; Amsgaard Ebsen, Jannie

    2012-01-01

    To improve methods used to study prehistoric cremation rituals, cremation urns from the Danish late Bronze Age were examined using Computed Tomography and Computed Radiography (Digital X-ray). During microexcavation, the digital images were used as registration tool. Our results suggest that oste...... intensity show markedly poorer preservation and recovery than white calcined fragments do. Thus post-excavation estimations of cremation intensity are systematically biased...

  4. The metallurgy in Romagna and surrounding area in the Bronze Age.

    Directory of Open Access Journals (Sweden)

    Marcello Ravaglia

    2009-10-01

    Full Text Available The outline of the metallurgical production in Romagna and western limit represented by the province of Bologna shows a solid activity during the entire Bronze Age. Despite the preliminary state of the research, through the collection of records and the distributive analysis, it is possible to evaluate some of the peculiarities of the region. In particular, the presence of hoards in EBA and FBA suggests the main focus for the analysis of exchange dynamics between Northern and Central Italy.

  5. Electrolytic surface hardening of steel,cast iron and aluminium-bronze

    Institute of Scientific and Technical Information of China (English)

    Suhas Keshav Paknikar

    2006-01-01

    Electrolytic hardening process was developed in USSR in the 1950s. The process was developed but was not commercially exploited. There is no evidence of work done on this process in India. The author has done this original work applied to different materials like steel,cast iron and aluminum-bronze. This paper gives details of microstructural transformations along with hardness value achieved. There is vital scope for this process to become viable for surface hardening and selective hardening of small components.

  6. On the Origin of Bronze Belt Plaques of Ancient Nomads in Northern China

    Institute of Scientific and Technical Information of China (English)

    WUEn; 丁小雷

    2003-01-01

    The bronze plaques decorated with animal, human or geometric designs were the ornaments on the leather belts of the nomadic people, such as Xiongnu (Hun) and Xianbei (Sienpi) in Northern China in the Qin and Han Dynasties. These plaques had unique regional and ethnical characteristics. There have been many different ideas on the origination of this kind of plaques. The author plans to give his own opinion hereby on this issue.

  7. Towards mineralogical and geochemical reference groups for some Bronze Age ceramics 
from Transylvania (Romania)

    OpenAIRE

    Volker Hoeck; Corina Ionescu; Lucretia Ghergari; Carmen Precup

    2009-01-01

    Based on their chemical composition ceramic shards from three Bronze Age sites in Transylvania, i.e., Copăceni, Derşida and Palatca respectively, were distinguished by major, trace, and RE elements. Within the Copăceni samples, two subgroups (A and B) showing different chemistry and mineralogy were additionally separated out. The link between chemistry and mineralogy showed clearly the important contribution of the temper to the overall chemistry of the ceramic shards. In turn, the chemistry ...

  8. Marco Calamari, Lampi di Cassandra: l’altro Steve

    OpenAIRE

    Pievatolo, Maria Chiara

    2011-01-01

    Mentre a Wozniak si devono i pochissimi momenti di apertura del software e del firmware Apple, "Jobs si è anche coperto del “fango” di aver scientemente concepito solo prodotti chiusi e di averli protetti con ogni arma fisica e legale possibile ed immaginabile, contribuendo non poco all’attuale pietoso e grave stato dell’informatica di consumo, e quindi della Rete stessa". Chi si avvicina all’informatica da utente potrebbe considerare tutto questo di interesse soltanto tecnico. Ma noi stu...

  9. 黑豆嘴类型青铜器中的西来因素%Western Elements in the Bronzes of Heidouzui Type

    Institute of Scientific and Technical Information of China (English)

    张文立; 林沄

    2004-01-01

    The cultural elements contained in the bronzes of Heidouzui type have often been studied in academic circles,but no unanimous views have been reached.The present paper discusses two forms of bronze ornaments of the Kayao culture in the Qinghai region and their date,as well as the relationship of some bronzes handed down from ancient times with those unearthed from Qinghai.On the basis of their comparative study the authors put forward that the Heidouzui-type bronzes contain cultural elements coming from the Qinghai region and even farther areas.These western elements might have been spread eastward and northward to still farther regions.

  10. Observações sôbre o bronzeado do algodoeiro Mocó Observations on bronzing of the Mocó cotton

    Directory of Open Access Journals (Sweden)

    A. S. Costa

    1955-01-01

    Full Text Available Uma anomalia do algodoeiro Mocó, denominada bronzeado, vem sendo observada na região do Seridó, Rio Grande do Norte, durante os últimos três anos. Pensou-se, a princípio, que esta anomalia fôsse causada por um vírus, mas as observações relatadas neste trabalho indicam que é causada por um ácaro. As fôlhas das plantas afetadas, especialmente aquelas da metade superior dos galhos, mostram uma coloração bronzeada no lado de baixo. Essa face da fôlha tem também uma superfície rugosa, com brilho vidrado (est. 1, B, as vezes com pequenas áreas de tecido cicatricial. Vistas pelo lado de cima são mais rugosas do que as normais e têm os bordos curvados para baixo. Nos casos graves, as fôlhas do topo dos galhos morrem e caem (est. 2, A e B. A espécie de ácaro causadora do bronzeado do algodoeiro Mocó foi identificada por H. H. Keifer, Sacramento, Calif., como pertencente a um gênero ainda não descrito da família Eriophyidae. Esta espécie está sendo presentemente denominada Anthocoptes sp. até que a sua descrição seja publicada. Populações de 500 a 1.000 indivíduos por centímetro quadrado de fôlha já foram encontradas. Esse ácaro parece ser muito sensível às condições do ambiente, visto que as populações da praga variam entre grandes limites.For the last three years a bronzing anomaly of cotton plants of the Mocó variety (Gossypium hirsutum L. var. maria galante Hutch. has been recorded in the Seridó region (a semi-arid region in the north-eastern part of Brazil, state of Rio Grande do Norte. This anomaly was first thought to be of virus origin, but the observations reported in this paper indicated that it is due to the attack by a species of mite. Leaves from affected plants, especially those on the upper half of the branches, show a bronzing discoloration on the dorsal side, frequently accompanied by a rough and ventral side of these leaves shows some rugosity not present in normal leaves, and in most cases

  11. Nordic and Celtic: religion in southern Scandinavia during the late bronze age and early iron age

    Directory of Open Access Journals (Sweden)

    Marianne Görman

    1990-01-01

    Full Text Available By means of modern archeological research it is today possible to gain much information even from non-written material, This paper covers the late bronze age and early iron age, ca. 1000 B.C. —O. It is based on material from Denmark, the Southwest of Sweden, and the Southeast of Norway. This region formed a cultural unity since the sea bound the area together. Our main sources of knowledge of Nordic religion during this time span are votive offerings and rock-carvings. During the bronze age and early iron age the Nordic peasant population had intensive contacts with the Southeastern and Centralparts of Europe. A great quantity of imported objects bear evidence of widespread connections. The inhabitants of the Nordic area not only brought home objects, but also ideas and religious conceptions. This is clearly reflected in the iconography. The cultures with which connections were upheld and from which ideas were introduced were those of Hallstatt and La Tène. They were both Celtic iron age cultures prospering in Central Europe at the same time as the late bronze age and early iron age in the Nordic area. This means that the new symbols in the Nordic area come from a Celtic environment. Consequently, Celtic religion such as it may be found in the pre-Roman period, can clarify the meaning of the conceptions, linked with these symbols.

  12. Effect of heat treatment on microstructure and properties of hot-extruded nickel-aluminum bronze

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    The effect of heat treatment on the microstructure and properties of a hot-extruded nickel-aluminum bronze was investigated. Experimental materials were heat treated through different processes, including quenching, normalizing, aging and annealing, and their microstructure, corrosion resistance and mechanical properties were characterized. It is found that quenching causes all β phase transformed into β' phase, however, normalizing causes β phase transformed into β', α and κ phases. When the quenched sample is aged, fine κ phase is precipitated from the as-quenched microstructure of β' phase. Annealing causes the transformation of β' into a and κ phases. The results of mechanical property tests show that quenching, normalizing and aging improve the tensile strength and hardness of the experimental material, with a corresponding fall in elongation. Annealing raises the elongation but reduces the tensile strength and hardness. Furthermore, corrosion resistance of nickel-aluminum bronze ranks from worse to better in the following order: aged, quenched, normalized, hot-extruded and annealed. However, with the exposure time of corrosion test increasing, the difference of average corrosion rate between those nickel-aluminum bronzes tums small.

  13. Evaluation of the inhibitive effect of benzotriazole on archeological bronze in acidic medium

    Science.gov (United States)

    Hassairi, Hèla; Bousselmi, Latifa; Khosrof, Slim; Triki, Ezzeddine

    2013-12-01

    An archaeological bronze artefact was a Punic coin excavated from the north east of Tunisia in 2001. The composition of the copper alloy revealed a content of 3.5 % of tin and 1.4 % of lead with the presence of some sulphur heterogeneity. The surface presents some roughnesses and cracks and is covered by a corrosion layer of 20-40 μm thickness. The use of benzotriazole (BTA) as an inhibitor has become a standard element for the preservation of cuprous-based metals. In order to investigate the behaviour of BTA in an acidic medium, an Electrochemical Impedance Spectroscopy (EIS) investigation was performed to characterize the electrochemical behaviour of the interface of the archaeological bronze sample/acidic medium without and with BTA addition. Impedance diagrams obtained at different immersion times show that the presence of the inhibitor prevents the diffusional process observed in the absence of BTA. The inhibition of the pre-polarized bronze surface revealed that the mechanism of action of the benzotriazole molecule in an acidic medium is governed by the chemisorption process.

  14. Analysis of the Quintilii’s Villa Bronzes by Spectroscopy Techniques

    Directory of Open Access Journals (Sweden)

    Fabio Stranges

    2014-01-01

    Full Text Available The aim of this work is the characterization, with different diagnostic tests, of three fragments of bronze artefacts recovered from the Villa of the Quintilii (located in the south of Rome. In particular, the sample alloys were investigated by different chemical and morphological analysis. Firstly, an analysis of the alloy, implemented through the electronic spectroscopy, was taken to discriminate the bronze morphology and its elemental composition. Subsequently, a surface analysis was realized by molecular spectroscopy to identify the alteration patinas on surfaces (such as bronze disease. Two diagnostic techniques are used for the alloy analysis: scanning electron microscopy (SEM connected to the EDX spectroscopy (to study the morphology and alloy composition and Auger electron spectroscopy (AES (to identify the oxidation state of each element. Moreover, for the study of surface patinas, IR and Raman spectroscopies were implemented. All studies were performed on the “as received” samples, covered by a thin layer of excavated soil and on samples processed in an aqueous solution of sulphuric acid (10%, to remove patinas and alterations.

  15. Como antigas estátuas de bronze

    Directory of Open Access Journals (Sweden)

    Oliver Lubrich

    2010-01-01

    Full Text Available A interpretação de América usando motivos classicistas como modelos imperiais de apropriação, "antiquização", é uma das principais estratégias retóricas nos relatos de viagens de Alexander von Humboldt, Relation historique du voyage aux régions équinoxiales du Nouveau Continent (1814-1831. A partir da experiência colonial, esse discurso está carregado de tensão. O conceito de antiguidade é, assim, desautorizado e desconstruído. Os leitores são testemunhas da dissolução do classicismo europeu como dispositivo político-estético produzido pela diferença cultural."Antiquifying" America is a central rhetorical strategy in Alexander von Humboldt's Relation historique du voyage aux régions équinoxiales du Nouveau Continent (1814-1831. Over the course of the colonial experience, tension infuses the discourse and problems in the use of classicist motifs as imperial models of appropriation become apparent: metaphoric and metonymic references collide; positive and negative connotations overlap; incompatible modes of temporalization contrast with one another; colonial and dissident identifications coincide. The concept of "antiquity" is de-authorized, deconstructed. Readers witness the dissolution of European classicism as a politico-aesthetic 'dispositif' due to the experience of cultural difference.

  16. A systematic approach to Bronze corrosion products and the methods of treatment , applied on three bronze anklets from Dhamar museum , Yemen

    Directory of Open Access Journals (Sweden)

    Hazem Mohamed

    2014-04-01

    Full Text Available Three bronze anklets were found during the archaeological excavation of Yemeni mission 2002 A.D, in Gabal al- lawd , Jawf area , Yemen , they dated back to Minaean period in Yemen [sixth century B.C – 24 B.C] , and now they are situated in Dhamar regional museum .They were suffered from the deterioration aspects , two of these anklets had a thick corrosion products of pale green / brown , the third anklet had a rust-colored Black and Brown with the presence of small parts and scattered pale green. The aim of this paper is to examine, in detail, the corrosion of the selected objects that was grown during the long-term burial and identify its products that will help us to understand the corrosive factors and the degradation mechanisms , as well as their constituting metals in order to carry out scientific treatment and conservation .For this purpose ,samples from the objects were examined by Metallographic Microscope (ME , Scanning Electron Microscope (SEM, the corrosion products were analyzed by X-ray diffraction (XRD and X-ray fluorescence( XRF was used to determine the objects metallic constituents . XRD data showed that the corrosion products constitute of cuprite , atacamite , and paratacamite , whereas XRF analysis declared that the anklets compose of bronze alloy . Microscopic examination reveals that the three anklets were suffered from the deterioration spots , which dispersed on the metal surface . Chemical cleaning was chosen for treating the objects , finally they were isolated to preserve them against further attack.

  17. Protection against inhaled oxidants through scavenging of oxidized lipids by macrophage receptors MARCO and SR-AI/II

    DEFF Research Database (Denmark)

    Dahl, Morten; Bauer, Alison K; Arredouani, Mohamed;

    2007-01-01

    Alveolar macrophages (AMs) express the class A scavenger receptors (SRAs) macrophage receptor with collagenous structure (MARCO) and scavenger receptor AI/II (SRA-I/II), which recognize oxidized lipids and provide innate defense against inhaled pathogens and particles. Increased MARCO expression ...... in lungs of ozone-resistant mice suggested an additional role protecting against inhaled oxidants. After ozone exposure, MARCO-/- mice showed greater lung injury than did MARCO+/+ mice. Ozone is known to generate oxidized, proinflammatory lipids in lung lining fluid, such as 5beta,6beta...

  18. The Relationship Between Ambiently Formed Oxides and the Tribological Behavior of Aluminum Bronze

    Science.gov (United States)

    Poggie, Robert Andre

    1992-01-01

    The relationship between ambiently formed oxides and the tribological behavior of aluminum bronze has been investigated. As the aluminum content of Al-bronze increases from zero to eight weight percent, the mechanical properties, oxidation kinetics, and tribological behavior of the alloy are significantly affected. This research has shown that the friction and wear behavior of Al-bronze depends primarily on the composition and mechanical stability of the ambiently formed surface oxide. Adhesive transfer of Al-bronze to the slider counterfaces increased with increasing aluminum content which corresponded to increased damage to the alloy surfaces and the formation of wear debris. The majority of surface damage (plastic deformation and galling) of the Cu-4 and 6 w/o Al alloys occurred during the initial portion (run-in) of wear testing. The Cu-1 w/o Al alloy wore via an oxidative wear mechanism throughout the course of wear testing. Galling, severe plastic deformation, the formation of metallic wear debris, and adhesive transfer were not observed for the Cu-1 AL w/o alloy. XPS and SEM analysis of the Cu-1 w/o Al alloy showed the worn surfaces to consist of a smooth and adherent Cu_2O layer. Long term ambient oxidation of the Cu-4 and 6 w/o Al alloys resulted in a layered oxide structure with Cu(OH)_2 at the surface followed by CuO, Cu_2O, Al_2O_3, and, lastly, the metallic substrate. The differences in elastic moduli, crystal structures, and composition between the copper alloy and the Al _2O_3 enriched surface oxide decreases the mechanical integrity of the surface oxide. The tensile and compressive stresses generated at the surface of the Al-bronze samples via frictional interaction with the opposing slider is sufficient to cause a large differential in strain across the oxide-metal interface and disruption of the brittle, Al_2O _3 enriched surface oxide. The exposed metal immediately repassivates itself by reforming a surface oxide or forming an adhesive bond with

  19. Review for the Volume “Alexei Marco. Destinul unui bijutier din Moldova” / Alexei Marco. The Destiny of a Jeweler from Moldova – Author Liliana Condraticova

    Directory of Open Access Journals (Sweden)

    Antonio SANDU

    2011-12-01

    Full Text Available The volume “Alexei Marco. The Destiny of a Jeweler from Moldova” review historiographical sources on jewelry art study, both worldwide and from Moldova. The historiographic presentation, performed with great professionalism in the use of historical sources, is perfected by the art critic’s sensitivity of Liliana Condraticova. The attraction of gold is alchemized, the metal being transformed into art. To simple economic value is added the esthetic human value.

  20. Intoxication by mining revenues. San Marcos district politics after twelve years of Antamina’s presence

    OpenAIRE

    Guillermo Salas Carreño

    2010-01-01

    This paper describes and analyses the changes in local politicstaken place in the district of San Marcos (Huari, Ancash) associatedwith the arrival of the Canon Minero – a fraction of taxes paid byAntamina mining company to the Peruvian State. Canon Minero hasincreased sudden and spectacularly the municipality’s funds so muchthat currently San Marcos in «ones of the Peruvian richest districts».The paper pays attention to the municipal elections of 2006 and theimplementation of the Plan Piloto...

  1. VAGINAL ECONOMY: Cinema and Globalization in the Post-Marcos Post-Brocka Era

    Directory of Open Access Journals (Sweden)

    Rolando B. Tolentino

    2010-12-01

    Full Text Available This essay explores the trope of the vaginal economy that is proliferated in the political economy and nature of Philippine migration. The vaginal economy is both receptacle and symptom of Philippine development. It represents the discourse through cinema, and historicizes the primal debate in the Marcos and Brocka contestation for image-building of the nation. Primarily through the sex-oriented (bomba films and their permutations in the various political life of the contemporary nation, the vaginal economy is historicized even in the after-life of the post-Marcos and post-Brocka era.

  2. Identidad de los abogados y formación universitaria en un marco de crisis

    OpenAIRE

    Marcelo Héctor Efrón

    2009-01-01

    El presente trabajo, realizado en el marco del Seminario sobre Perspectivas Filosófico-Políticas de la Educación Contemporánea a cargo del Prof. Dr. Carlos Cullen, tiene como objetivo efectuar una breve una aproximación a la idea de identidad de los abogados, para posteriormente abordar algunos enfoques sobre el derecho y justicia, haciendo un rápido pasaje hacia una muy simplificada referencia a la formación de abogados en el marco de lo que entendemos como una crisis de identidad profesion...

  3. El circo criollo en el marco de la construcción de la nacionalidad argentina

    OpenAIRE

    Sánchez, Daniel; Andruchow, Marcela; Cordero, Silvina

    2005-01-01

    El presente trabajo tiene como objetivo analizar desde una perspectiva crítica e interpretativa y como producción simbólica al denominado Circo criollo, en el marco espacial de la Ciudad y la Provincia de Buenos Aires y temporal de la segunda mitad del siglo XIX., partiendo de la premisa de entender a dicha manifestación cultural, como un emergente importante para analizar el proceso histórico y social en un marco de urbanización y modernización acelerada de países con alta inmigración. El ci...

  4. Lead isotopic study of Shang Dynasty bronzes (13-11 B.C.) and their ore sources

    International Nuclear Information System (INIS)

    The Shang Dynasty civilization in China is based on the development of the bronze techniques. A large amount of Shang Dynasty bronzes, excavated from Jiangxi, Hubei and Henan Provinces, have become a focus of world attention. However, the Shang Dynasty center was located at Zhenzhou and Anyang city areas, Henan Province, where no large copper ores have been found so far. Therefore, where did the huge ore material for casting the bronzes come from? It is an unsettled question paid attention by the archaeologists and scientists. 35 Shang Dynasty bronzes and 21 copper and lead ore materials aged in the Shang-Zhou Dynasty, the Spring-Autumn Period and the modern time, have been measured by the use of mass spectrometry. Based upon lead isotopic ratios, the ore material for casting the bronzes with the middle isotopic ratios of 207Pb/206Pb ranged in 0.8∼0.9 could come from the ancient copper mine of Tongling, Jiangxi Province and Tong Lushan , Hubei Province and that with the high isotopic ratios (>0.9) could be from the northern part of the Shang Empire, called 'Gongfang' in the historical records, e.g. today's Hebei and Liaoning Provinces. the others with the low isotopic ratios (238U/204Pb in the ore flux or in the magma

  5. Pioneering farmers cultivating new lands in the North – The expansion of agrarian societies during the Neolithic and Bronze Age in Scandinavia

    DEFF Research Database (Denmark)

    Sørensen, Lasse

    2012-01-01

    Pioneering farmers cultivating new lands in the North – The expansion of agrarian societies during the Neolithic and Bronze Age in Scandinavia......Pioneering farmers cultivating new lands in the North – The expansion of agrarian societies during the Neolithic and Bronze Age in Scandinavia...

  6. Las interpelaciones de la transmodernidad y la cuestión del marco categorial

    Directory of Open Access Journals (Sweden)

    Yamandú Acosta

    2013-11-01

    Full Text Available Se considera a las ciencias sociales y las humanidades desde una perspectiva crítica latinoamericanaa propósito de la integración, focalizando la cuestión del marco categorial desde las interpelaciones de latransmodernidad.

  7. El derecho de asilo en tanto derecho fundamental en el marco del Derecho Comnitario

    OpenAIRE

    Fonseca Morillo, Francisco J.

    2008-01-01

    1.- Introducción. 2.- La protección y el respeto de los derechos fundamentales en el ámbito del derecho comunitario. 3.- El derecho de asilo en el marco del derecho comunitario. 4.- El derecho de asilo como derecho fundamental....

  8. Muid võimalusi ei ole! / Kristina Norman, Marco Laimre ; intervjueerinud Elena Šmakova

    Index Scriptorium Estoniae

    Norman, Kristina, 1979-

    2009-01-01

    53. Veneetsia biennaalil "Making Worlds" ("Konstrueerides maailmu") Eestit esindavast Kristina Normani Tõnismäe pronkssõduri monumenti käsitlevast kunstiprojektist "After-War" ("Järelsõda"). Projekti kuraator Marco Laimre. Eesti ekspositsioon on avatud Palazzo Malipieros 6. juunist 22. novembrini. Biennaali nõukogu otsustas anda suured Kuldsed Lõvid elutöö eest Yoko Onole ja John Baldessarile

  9. Competencias básicas en Infantil, Primaria y Secundaria. Marco teórico.

    OpenAIRE

    Viana Orta, María Isabel

    2007-01-01

    Marco teórico del nuevo modelo educativo tras la aprobación de la LOE, basado en la adquisición y desarrollo de comptencias básicas. El material forma parte de cursos de formación permanente del profesorado.

  10. Project Marco Polo: Bridging the Gap between Natural and Social Sciences.

    Science.gov (United States)

    Bein, Frederick L.; Rea, Patrick

    1992-01-01

    Describes Project Marco Polo in which students, teachers, and staff from "National Geographic" and the U.S. Navy traveled to Japan. Reports that they studied Japanese culture, oceanography, and natural science while on the trip. Includes excerpts from field journals kept by the participants, photographs of the trip, and a map. (DK)

  11. Il Doge and Easter Processions at San Marco in Early Modern Venice

    DEFF Research Database (Denmark)

    Petersen, Nils Holger

    2010-01-01

    –1800. Traditional representational features – from the early Middle Ages – e.g. of the women at Christ’s grave had been incorporated into these ducal processions during the sixteenth century with special roles for the doge. The complex of solemn processions from the ducal palace around the San Marco piazza...

  12. Microstructure and mechanical properties of Ti6Al4V/Cu-10Sn bronze diffusion-bonded joint

    Institute of Scientific and Technical Information of China (English)

    ZHAO He; CAO Jian; FENG Ji-cai

    2009-01-01

    The microstructures and mechanical properties of Ti6Al4V/Cu-10Sn bronze diffusion-bonded joint were studied via scanning electron microscopy(SEM) and energy dispersive spectrometry(EDS). Diffusion bonding of Ti6Al4V to Cu-10Sn bronze was investigated at different holding time. Four obvious interracial layers were observed in the joint. It is revealed that the bonding joint has high shear strength up to 102 MPa bonded at 830 ℃, bonding pressure 10 MPa and bonding time 15 min. Shear test results show that the fracture takes place between the reaction layer and the Cu-10Sn bronze substrate, and the shear strength is strongly related to the formation of Cu-Ti-Sn intermetallic compounds.

  13. Corrosion and wear behaviors of Al-bronzes in 5.0% H2SO4 solution

    Institute of Scientific and Technical Information of China (English)

    LI Wen-sheng; WANG Zhi-ping; LU Yang; YUAN Li-hua; XIAO Rong-zhen; ZHAO Xu-dong

    2009-01-01

    Steady-state corrosion and wear behaviors of two Al-bronzes, Cu-14Al-X and QAl9-4, in 5.0% H2SO4 solution were investigated. It is found that wear loss of bronzes in 5.0% H2SO4 solution is lower than that in water or in air, namely, it exhibits negative synergy between corrosion and wear. Further analysis shows that corrosive solution plays an important role in cooling of specimen during the sliding wear to prevent the reduction of the surface hardness of specimen, induced by frictional heat. On the other hand, the bronzes suffer a de-alloying corrosion, and a noble copper subsurface and patina form on the specimen surface in corrosive solution, which has a passive function for further corrosion. The noble copper subsurface experiences strain hardening during the corrosion and wear, resulting in the increase of the surface hardness thus the increase in wear resistance.

  14. A Preliminary Study of Bronzes in the Kayao Culture%卡约文化青铜器初步研究

    Institute of Scientific and Technical Information of China (English)

    三宅俊彦

    2005-01-01

    A chronological study of its pottery suggests that the Kayao culture remains can be divided into the groups of Huangshui River and Yellow River valleys and each group fall into six phases.On this basis the typology and combination of bronzes in the Kayao culture can be further studied. The results indicate that bronze-making technology in the Huangshui River valley was higher than that in the Yellow River valley, and that the sexual difference of tomb-owners is reflected from the distinction of funeral objects. Furthermore, the chronological study of the Kayao's bronzes provides reference data for dating the phases of this culture. These bronzes possess three categories of cultural elements: the elements of their own, common elements of bronzes in the Central Plains and North China, and those in northern Eurasia.

  15. Teoría de los marcos relacionales y la trasformación de las funciones del estímulo

    OpenAIRE

    Simon Dymond; Bryan Roche; Ruth Anne Rehfeldt

    2005-01-01

    La teoría de los marcos de relaciones es una teoría y tecnología moderna del lenguaje y la cognición que hace gran énfasis en la trasformación de funciones de estímulo de acuerdo con las relaciones múltiples del estímulo. Revisamos la investigación reciente sobre la trasformación de las funciones de estímulo y argumentamos que la trasformación derivada posee importancia clínica, no solo porque da cuenta de la emergencia de nuevas respuestas ante estímulos previamente neutrales ...

  16. Analysis of the Portevin - Le Chatelier effect in tin bronzes at elevated temperatures

    Directory of Open Access Journals (Sweden)

    W. Ozgowicz

    2008-12-01

    Full Text Available Purpose: The aim of the present paper is the determination of the effect of the chemical composition and temperature of deformation of standardized tin bronzes and bronze modified with zirconium on the Portevin – Le Chatelier (PLC phenomenon, mainly basing on the shape of stress-strain curves within the temperature range of 100-300oC and observations of their structure. The reasons of the occurrence of such en effect are so far no fully known and explained and the opinions concerning is physical basis vary.Design/methodology/approach: Of essential design in this research is determination of the dependence of PLC effect on the chemical composition, temperature and strain rate and the preliminary heat treatment and grain size. The main method used in this investigation is tensile test at elevated temperature.Findings: The main conclusions are following: the PLC effect on tin bronzes with a micro-addition of zirconium in an amount of 0.01-0.05% depends the temperature of deformation in the tensile test in the range of 100-300oC and the chemical composition of the alloys; the type of serration revealed on the σ–ε curve depend mainly on the temperature of deformation and can be differ during the respective stages of the analyzed curves.Practical implications: In this paper implications for practice are not taken into consideration.Originality/value: In this paper an additive type of serration observed on the curves σ–ε, denoted by the symbol D, is new.

  17. On the degradation factors of an archaeological bronze bowl belonging to a private collection

    Energy Technology Data Exchange (ETDEWEB)

    Soffritti, C., E-mail: chiara.soffritti@unife.it [TekneHub, Department of Architecture, University of Ferrara, Via Quartieri 8, 44122 Ferrara (Italy); Department of Engineering, University of Ferrara, Via Saragat 1, 44122 Ferrara (Italy); Fabbri, E., E-mail: elettra.fabbri@unife.it [Department of Engineering, University of Ferrara, Via Saragat 1, 44122 Ferrara (Italy); Merlin, M., E-mail: mattia.merlin@unife.it [Department of Engineering, University of Ferrara, Via Saragat 1, 44122 Ferrara (Italy); Garagnani, G.L., E-mail: gian.luca.garagnani@unife.it [Department of Engineering, University of Ferrara, Via Saragat 1, 44122 Ferrara (Italy); “A. Daccò” Corrosion and Metallurgy Study Centre, University of Ferrara, Via Saragat 1, 44122 Ferrara (Italy); Monticelli, C., E-mail: cecilia.monticelli@unife.it [Department of Engineering, University of Ferrara, Via Saragat 1, 44122 Ferrara (Italy); “A. Daccò” Corrosion and Metallurgy Study Centre, University of Ferrara, Via Saragat 1, 44122 Ferrara (Italy)

    2014-09-15

    Highlights: • Bronze bowl from Iran belonging to a private collection. • Style and manufacturing consistent with the Achaemenid art (I century B.C.). • Modified Type I patinas. • Apparently continuous tenorite layer at the metal surface on the internal bowl side. • Fragmentation attributed to a severe intergranular attack. - Abstract: A bronze bowl belonging to a private collection, stylistically consistent with the Achaemenid art was investigated to determine the cause of the artwork local fragmentation. The corrosion products were characterised by energy dispersive X-ray fluorescence spectrometry (EDXRF), Raman spectroscopy and scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS). The last technique was also used to determine the chemical composition of the alloy. The metallographic analysis showed that the bowl was obtained from a monophasic bronze alloy, containing about 11% tin and other elements in traces. The presence of an inhomogeneous microstructure with both thermal twin bands and slip lines was consistent with multiple hammering steps followed by partial annealing treatments. On the bowl a very limited chloride contamination was observed and chlorides were never detected in proximity to the metal. These findings and the morphological/compositional characteristics of the patinas permitted to classify that on the internal side of the bowl as a modified Type I morphology, while the patina on the external side of the bowl was less compact, so that it was judged borderline between a “noble” patina and a disfiguring one. On this side, a significant intergranular attack was found, reputed responsible for the fragmentation occurred.

  18. Characterization and Photocatalytic Activity of KSr_2Nb_5O_(15) with Tungsten Bronze Structure

    Institute of Scientific and Technical Information of China (English)

    ZHANG Gaoke; LI Yiqiu; WANG Junting; TU Haibin; YU Xinyi

    2009-01-01

    Tungsten bronze(TB)type potassium strontium niobate KSr_2Nb_5O_(15) was prepared by solid-state reaction method,and was characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM)and UV-vis diffuse spectrum.The photocatalyst shows high photocatalytic activity of photodegrading acid red G.The effects of photocatalyst dosage and initial concentration of acid red G on the photodegradation process were studied.The kinetics of photocatalytic degradation of acid red G by KSr_2Nb_5O_(15) catalyst follows the first order reaction.

  19. Electrolytic surface hardening of steel,castiron and aluminium-bronze

    Directory of Open Access Journals (Sweden)

    Suhas Keshav Paknik a r

    2006-08-01

    Full Text Available Electrolytic hardening process w as developed in USSR in the 1950s. The process w as developed but w as not com m ercially exploited. There is no evidence of w ork done on this process in India. The author has done this originalw ork applied to different m aterials like steel, castiron and alum inum -bronze.This paper gives details ofm icrostructuraltransform ations along w ith hardness value achieved. There is vitalscope for this process to becom e viable for surfacehardening and selective hardening ofsm allcom ponents.

  20. THE EFFECTS OF PERFORMANCE CHARACTERISTICS TO THE COEFFICIENT OF FRICTION IN SINTERED BRONZE BEARINGS

    Directory of Open Access Journals (Sweden)

    Gültekin KARADERE

    2001-01-01

    Full Text Available In this study, the effects of performance characteristics of self-lubricating, sintered bronze journal bearings to the coefficient of friction is investigated via an experimental test rig. In the experiments, the variation of the coefficient of friction for different velocities and pressures has been investigated for the cases in which an additional oil mass is fed and not fed into the bearing. Furthermore, in the cases where the other parameters are kept constant, the effects of velocity, pressure and temperature to the coefficient of friction are separately investigated, and the results are plotted.

  1. Synthesis and structure of a quadratic oxygen bronze containing uranium of valence six

    International Nuclear Information System (INIS)

    (Nb7.6U2.4)(Ba5.2K0.8)O30 is a quadratic bronze with space group P4bm and lattice parameters a = 12.608(5) and c = 4.012(2) A, Z=1. The structure of a single crystal was refined to R = 0.056 (RW = 0.072) for 967 independent reflections with I ≥ 3σI. The U6+ ion is located inside octahedral sites with Nb5+ and Nb4+. (orig.)

  2. THE PALEODEMOGRAPHIC PATTERN OF OYLUM HOYUK POPULATION (THE MIDDLE BRONZE AGE, KİLİS)

    OpenAIRE

    Ayşen Açıkkol Yıldırım

    2013-01-01

    In this study skeleton remaining of 72 individuals excavated from Middle Bronze Age layers of Oylum Höyük (mound) situated in Kilis province, were studied. Sex and age of skeletons, unearthed between 2007-2012, were determined and life tables of the population were formed. Mortality of infants and children of Oylum population was very high. Death rates were determined as 36.6 % for 0-5 years of age group, 57.75 % for 0-15 years of age group. 34.62 % of infants and children from 0-5 years of a...

  3. ARCHAEOMETALLURGICAL STUDIES OF SPEAR HEADS AND ARROW HEADS OF THE MIDDLE BRONZE AGE SITES OF AZERBAIJAN

    OpenAIRE

    Hasanova, Aziza

    2015-01-01

    Quantitative spectroscopy analysis of spear heads and arrow heads of Middle Bronze Age sites of Azerbaijan (second part of the III to the middle of the II millennium BC) has been made to determine the type of the alloy taking into account the accepted limits of natural impurity in metals ( - 0.5% and more). The analyses have shown that copper is the basic materials in all of them. Metallurgical classification the results of sixteen analysis spear heads have shown three of them made of arsenic...

  4. Compositional analyses of a Reutlingen Bronze Age sword discovered at Giurgiu, Romania

    CERN Document Server

    Olariu, A; Avram, A; Badica, T; Olariu, Agata; Alexandrescu, Emilian; Avram, Alexandru; Badica, Teodor

    2003-01-01

    The compositional scheme of a Bronze Age sword, found near the town of Giurgiu in Romania has been determined by the method of particle-induced X-ray emission (PIXE), at the tandem accelerator of the National Institute for Physics and Nuclear Engineering from Bucharest, Magurele, Romania. The results of the analyses and the comparison with the composition of other swords from the same geographic area, the Danubian plane from Bulgaria and Transylvania regions, show that the sword from Giurgiu could be relatively associated with the swords from Bulgaria, having also the same stylistic, temporal and geographical similitude.

  5. SUSCEPTIBILIDAD GENÉTICA AL CÁNCER:ALGUNAS CONSIDERACIONES BIOÉTICAS BAJO EL MARCO LEGAL VENEZOLANO

    Directory of Open Access Journals (Sweden)

    Flores Angulo Carlos JG

    2010-04-01

    Full Text Available

    El cáncer es una enfermedad que se caracteriza por la proliferación rápida e incontrolada de las células. Existen varios factores de riesgo asociados, entre ellos, el hereditario tal vez sea el más importante, ya que, aunque el fenotipo tiene una gran dependencia de las condiciones ambientales, la base de la carcinogénesis es el daño genético no letal. En este sentido, el estudio de los marcadores genéticos de susceptibilidad adquiere capital importancia, ya que estos permiten identificar a los individuos con alto riesgo genético, estimar su pronóstico y respuesta al tratamiento, adquiriendo la medicina un carácter más predictivo y preventivo. No obstante, esto podría desencadenar problemas éticos de gran impacto, especialmente difíciles de solucionar en una sociedad carente de un marco legal adecuado. Es importante, así,  realizar un análisis del Sistema Legal Venezolano (SLV que protege la información del genoma humano y sus repercusiones bioéticas. Para ello, se realizó una búsqueda e interpretación del marco normativo venezolano vigente, de publicaciones inherentes al cáncer, su susceptibilidad y tecnología diagnóstica. Las conclusiones derivadas son: 1 No es recomendable la oferta masiva de pruebas para la detección de riesgo genético debido a sus repercusiones psicosociales y laborales, 2 El desarrollo del SLV vinculado a la protección del genoma es bastante limitado, y 3 Es necesaria la adecuación del SLV al inminente desarrollo científico, para así controlar el impacto bioético de la información obtenida y garantizar 夏商周青铜器铅同位素示踪研究数据库的构建%A Lead Isotope Ratio Data Base of Ancient Chinese Bronzes

    Institute of Scientific and Technical Information of China (English)

    金正耀

    2005-01-01

    A data base of lead isotope ratio of ancient Chinese bronzes is set up. There are 2 888 members, including bronze objects, casting remains, and related ores, etc. in the file. The file contents of data base are made from analysis work on Chinese bronze previously carried out in several laboratories in China, Japan and USA. The main body of the file contents is formed from records, analysis data, reference documents, and images. The data base is designed for sharing information in provenance study on raw metal material for bronze production in China Bronze Age.

  6. Sobre la instrumentalización de la identidad en el marco de las luchas por el reconocimiento político de los pueblos indígenas en Colombia

    OpenAIRE

    Tobar Tovar, Carlos

    2014-01-01

    En este artículo plantearemos un abordaje a algunos fundamentos históricos y jurídicos del indigenismo en Colombia. Posteriormente, aludiremos a cómo se da el paso de la insurrección a la política describiendo el modo en que se evidencia la colectivización de los pueblos indígenas. Finalmente ofreceremos una lectura sobre la vivencia de la identidad étnica e introduciremos la idea de la instrumentalización de la identidad en el marco de las luchas sociales; también hablaremos del potencial tr...

  7. Para uma Crítica da Razão Psicométrica

    Directory of Open Access Journals (Sweden)

    Patto Maria Helena Souza

    1997-01-01

    Full Text Available A partir da presença de testes e de laudos psicológicos na escola pública de 1º grau, o artigo discute, no marco teórico do materialismo histórico, aspectos epistemológicos e políticos do psicodiagnóstico.

  8. Integrated analytical methodologies for the study of corrosion processes in archaeological bronzes

    Energy Technology Data Exchange (ETDEWEB)

    Alberghina, Maria Francesca; Barraco, Rosita; Brai, Maria; Schillaci, Tiziano, E-mail: tschillaci@unipa.it; Tranchina, Luigi

    2011-02-15

    The investigations on structure and micro-chemical composition of archaeological metal alloys are needed in archaeometry. The aim of this study is devoted both to acquire information about their provenance and production technology, and to improve our understanding about the corrosion processes. In this paper we present the study of the corrosion phenomena of bronze samples, laboratory-made according to binary, ternary and quaternary alloys typical of Roman archaeometallurgical production through an integrated methodology based on the use of non or micro invasive physical techniques. Among the analysed samples, two were artificially aged through burial in the archaeological site of Tharros, along the west coast of Sardinia (Italy). The corrosion products, typical of the bronzes in archaeological sites near the sea, have been characterized by non invasive and micro-destructive measurements. In particular, the corrosion patinas were examined through optical microscopy, scanning electron microscopy and microanalysis, X-ray fluorescence and laser ablation spectroscopy. The use of integrated technologies allowed us to determine both the elemental composition and surface morphology of the patina, highlighting the correlation between patina nature and chemical composition of the burial context. Moreover, data obtained by the laser-induced breakdown spectroscopy along the depth profile on the samples, have yielded information about the stratigraphic layers of corrosion products and their growth. Finally, the depth profiles allowed us to verify both the chemical elements constituting the patina, the metal ions constituting the alloy and the occurrence of migration phenomena from bulk to the surface.

  9. Las Lunas (Yuncler, Toledo. A Bronze Age hoard with metallic materials from the southern Iberian Meseta

    Directory of Open Access Journals (Sweden)

    Urbina Martínez, Dionisio

    2010-06-01

    Full Text Available Here we present the results of the preliminary study carried out on a new group of metallic materials of the Final Bronze Age, recovered at the end of 2008 in the archaeological excavations at the settlement of Las Lunas (Yuncler, Toledo, Spain. Its geographical situation far away from the main zones of distribution of this type of finds, the singularity of the materials, and the evidence of Atlantic and Mediterranean relations make these materials a remarkable sample for the study of the Final Bronze Age in the centre of the Iberian Peninsula.

    Se exponen los resultados del primer estudio realizado sobre un nuevo conjunto de materiales metálicos del Bronce Final recuperado a finales de 2008 en las excavaciones arqueológicas del yacimiento de Las Lunas (Yuncler, Toledo, España. La localización geográfica del hallazgo, lejos de las principales zonas de dispersión conocidas para este tipo de conjuntos, la singularidad de los objetos que integra, y las relaciones atlánticas y mediterráneas que evidencian sus materiales, lo convierten en un ejemplo destacado para el estudio de este período en el centro de la Península Ibérica.

  10. Thermal conductance at millikelvin temperatures of woven ribbon cable with phosphor-bronze clad superconducting wires

    Science.gov (United States)

    Woodcraft, Adam L.; Ventura, Guglielmo; Martelli, Valentina; Holland, Wayne S.

    2010-08-01

    Woven Nomex® ribbon cables made up with superconducting niobium-titanium wire are used at millikelvin temperatures in many large cryogenic instruments. It is important to know how much heat in transmitted down such cables. However, the conductivity of the materials used is not well known. Another problem is that the wires are normally clad with alloys which exhibit some magnetism. This is a potential problem for instruments employing superconducting detectors. A safe non-magnetic alternative to the usual materials is phosphor-bronze clad niobium-titanium wiring. However, there is little experience with such wires. We have therefore measured the conductance of a ribbon cable made up with these wires. The measured values are in good agreement with our predictions, suggesting that the values we have used to model the cable are sufficiently accurate, and could therefore be used to predict the performance of ribbon cables using other cladding materials, so long as the conductivity of the cladding is reasonably well known. As part of our analysis, we consider the likely variation in thermal conductivity values for C51000 phosphor bronze caused by legitimate variations in composition.

  11. Ancient bronze coins from Mediterranean basin: LAMQS potentiality for lead isotopes comparative analysis with former mineral

    Science.gov (United States)

    Torrisi, L.; Italiano, A.; Torrisi, A.

    2016-11-01

    Bronze coins coming from the area of the Mediterranean basin, dated back the II-X Cent. A.D., were analyzed using different physical analytical techniques. Characteristic X-ray fluorescence was used with electrons and photons, in order to investigate the elemental composition of both the surface layers and bulk. Moreover, the quadrupole mass spectrometry coupled to laser ablation (LAMQS technique) in high vacuum was used to analyse typical material compounds from surface contamination. Mass spectrometry, at high resolution and sensitivity, extended up to 300 amu, allowed measuring the 208Pb/206Pb and 207Pb/206Pb isotopic ratios into the coins. Quantitative relative analyses of these isotopic ratios identify the coin composition such as a "fingerprint" depending on the mineral used to extract the lead. Isotopic ratios in coins can be compared to those of the possible minerals used to produce the bronze alloy. A comparison between the measured isotope ratios in the analyzed coins and the literature database, related to the mineral containing Pb as a function of its geological and geophysical extraction mine, is presented. The analysis, restricted to old coins and the mines of the Mediterranean basin, indicates a possible correlation between the coin compositions and the possible geological sites of the extracted mineral.

  12. The bronze shields found at the Ayanis fortress (Van region, Turkey): manufacturing techniques and corrosion phenomena

    Science.gov (United States)

    Ingo, G. M.; Çilingiroğlu, A.; Faraldi, F.; Riccucci, C.; Casaletto, M. P.; Erdem, A.; Batmaz, A.

    2010-09-01

    The manufacturing techniques, chemical composition and corrosion products grown on archaeological bronze shields found during the excavation of the Ayanis fortress (Lake Van region, Eastern Anatolia, Turkey) were studied by means of the combined use of scanning electron microscopy combined with energy dispersive spectrometry (SEM-EDS), X-ray diffraction (XRD) and optical microscopy (OM) techniques. The shields are dated back to 673-645 BC and in some cases are decorated with cuneiform inscriptions and ornaments representing various animals, such as lions and bulls. The micro-chemical and structural results show the presence of corrosion products constituted by copper carbonates (azurite and malachite), cuprite and dangerous chlorine-based compounds (nantokite, atacamite, clinoatacamite and paratacamite) due to the Cl-enriched soil of Ayanis. Furthermore, the results show that the bronze shields are coated with a Sn-enriched thin layer, likely due to an intentional tinning process carried out in ancient times to achieve a silver-like finish. Analytical data show an inter-granular corrosion phenomenon that heavily corroded the boundaries of the large equiassic grains inducing mechanical weakness. This latter phenomenon was induced by the repeated cycles of mechanical work and annealing thermal treatments carried out to restore the ductility and malleability of the alloy. Such processing caused the crystallisation and growth of the flattened grains, as well as impurities segregation phenomena along grain boundaries, thus enhancing the inter-granular long-term corrosion.

  13. Neutron activation analysis of Lerna ceramics (Greece) at Early Bronze Age: local production and trade exchanges

    International Nuclear Information System (INIS)

    Neutron activation analysis is a powerful tool for determining the provenance of ancient ceramics. A sophisticated analytical system for gamma-ray spectrometry, designed specifically for the chemical analysis of ceramics by thermal neutron activation, was used to determine the concentrations of twenty elements in samples of ancient pottery. The measurements were made relative to the standard pottery of Perlman and Asaro. The purpose of the work was to study the production of fine pottery at the settlement of Lerna, in the Argolid of Greece, during the Early Bronze Age (third millennium BC). About half of the 50 samples analysed formed the major compositional group, which was attributed to Lerna. It included, besides the majority of the samples from the second phase of the Early Bronze Age (Lerna III), several samples from the third phase (Lerna IV); that is, from levels immediately succeeding the great destruction which marks the end of the Lerna III settlement. A small number of objects forms a second group of local origin and includes 4 of the 5 clay sealings sampled. Among the archaeologically unusual objects, several could be attributed to Lerna, while others were characterized as imports

  14. The atmospheric corrosion of quaternary bronzes: An evaluation of the dissolution rate of the alloying elements

    Science.gov (United States)

    Bernardi, E.; Chiavari, C.; Martini, C.; Morselli, L.

    2008-07-01

    A comparative evaluation of the corrosion behaviour of a G85 bronze in acid rain solutions was performed. As weathering technique, a wet dry device was used to simulate a cyclic exposure to stagnant rain. The weathering solutions were a collected natural rain and an artificial solution reproducing the natural rain. The solutions were periodically monitored as concerns pH and metallic ion concentrations. On the aged specimens, surface studies were performed through OM, SEM and Raman analyses. At the end of weathering tests (40 days), weight loss measurements were carried out. The aim of this work was to examine the reproducibility in laboratory of the corrosive conditions determined by a natural acid rain. The final goal of this research is to investigate the dissolution of a quaternary alloy exposed to acid rains. The results showed slightly different corrosion behaviours as a consequence of the exposure to natural or synthetic rain. Concerning the mechanism of corrosion of G85 bronze, the innovative approach adopted in this study allowed one to point out the contribution of each alloying element to the general corrosion. Actually, while Cu and Pb progressively form insoluble corrosion compounds, Zn continuously dissolves, without forming detectable insoluble products. The absence of dissolved tin is remarkable.

  15. The Pranemuru project and the radiocarbon chronology of the Sardinian Bronze Age

    Directory of Open Access Journals (Sweden)

    Rubinos, Antonio

    2003-12-01

    Full Text Available New C-14 data collected by a Spanish team working in the Sardinian Pranemuru area, allow usthe possibility of revising the C-14 Chronology for the Nuragic Bronze Age and discussing the reliability of some of the dates, as well as the way they have been published, and their matching with the new official chronology for the Sardinian Bronze and Iron Ages, built on Dendro and C14 sequences for the Italian Peninsula.

    La obtención por parte del Proyecto Pranemuru de cerca de una veintena de dataciones radiocarbónicas para una microregión en época nurágica, de las que aquí se recogen discuten catorce, abre la posibilidad de revisar la cronología de la Edad del Bronce en Cerdeña, a la luz de las dataciones recogidas desde los años 90 por Trump (1990 y Tykot (1994 y, más recientemente, por Webster (2001, discutir la validez de las fechas en función de los criterios de recogida de muestra, contexto arqueológico, desviación estándar y forma en que ha sido publicada, así como contrastarla con la cronología propuesta recientemente para la Protohistoria sarda, de acuerdo con la Dendrocronología y Cronología Radiocarbónica para la Italia peninsular (Lo Schiavo 2002.

  16. $Nb_{3}Sn macrostructure, microstructure, and property comparisons for bronze and internal Sn process strands

    CERN Document Server

    Lee, P J; Larbalestier, D C

    2000-01-01

    The variation in irreversibility field, B*(T), with temperature has been measured for Nb/sub 3/Sn superconducting strands manufactured for ITER using vibrating sample and SQUID magnetometers. The high performance strands were developed for both high transport critical current density, J/sub c/, and low hysteresis loss. Despite a wide variety of designs and components, the strands could be split into two distinctive groups, based on the extrapolated irreversibility fields, which lie about 10% lower than the upper critical field. "Bronze-process" strands exhibited consistently higher B*(T) (28 T to 31 T) compared with "internal Sn" process (24 T to 26 T) conductors. The intrinsic critical current density of the superconductor, J/sub c (sc)/, and the specific pinning force of the grain boundaries, Q/sub gb/, were evaluated using the measured J/sub c/, and image analysis of the macro- and micro-structures. A bronze-processed Nb(-Ta)/sub 3 /Sn was found to have a higher J/sub c(sc)/ but lower Q/sub gb/ than Nb/sub...

  17. Una perspectiva filosófica de la ciencia hoy en día: Entrevista con Alfredo Marcos

    OpenAIRE

    Maia, Eduardo Cesar; Roaro, Jorge

    2012-01-01

    [ES] En el invierno de 2012, el Prof. Alfredo Marcos respondió una serie de preguntas sobre filosofía de la ciencia para el primer número de Disputatio. En esta entrevista, Alfredo Marcos presenta los fundamentos históricos y filosóficos de la ciencia en sentido amplio y nos presenta cómo funciona su aplicación en diferentes ámbitos: comunicación de la ciencia, investigación clínica, política ambiental, poética de la ciencia. [EN] At the winter of 2012, the Prof. Dr. Alfredo Marcos answere...

  18. Investigation on corrosion stratigraphy and morphology in some Iron Age bronze alloys vessels by OM, XRD and SEM-EDS methods

    Science.gov (United States)

    Oudbashi, Omid; Hasanpour, Ata; Davami, Parviz

    2016-04-01

    The recently study of the corrosion in some bronze artefacts from the Sangtarashan Iron Age site, western Iran, was established to identify corrosion morphology and mechanism in these objects. The corrosion layers in 22 samples were studied by optical microscopy, scanning electron microscopy-energy-dispersive X-ray spectroscopy and X-ray diffraction methods. The results showed that a thin corrosion crust has formed on the surface of bronzes with a triple-layer structure, including two internal and one external corrosion layers. The formation of these layers is due to copper leaching from the bronze surface. The internal corrosion part has been a compact, tin-rich corrosion/oxidation product (noble patina) with some evidences from original metallurgical aspects of the bronze as well as a very thin layer beneath the tin-rich layer. External corrosion products have been identified as basic copper carbonates, malachite and azurite. Based on the results, the corrosion morphology in the Sangtarashan Iron Age bronzes is due to long-term burial in an appropriate environment in a moderately corrosive soil. Although it is the first time to investigate Iron Age bronzes from Iran, this corrosion morphology is partially similar to type I corrosion morphology observed in archaeological bronze objects; nevertheless, some deviations are visible in comparison with previously established patterns.

  19. Identidad de los abogados y formación universitaria en un marco de crisis

    Directory of Open Access Journals (Sweden)

    Marcelo Héctor Efrón

    2009-12-01

    Full Text Available El presente trabajo, realizado en el marco del Seminario sobre Perspectivas Filosófico-Políticas de la Educación Contemporánea a cargo del Prof. Dr. Carlos Cullen, tiene como objetivo efectuar una breve una aproximación a la idea de identidad de los abogados, para posteriormente abordar algunos enfoques sobre el derecho y justicia, haciendo un rápido pasaje hacia una muy simplificada referencia a la formación de abogados en el marco de lo que entendemos como una crisis de identidad profesional y, que se presenta temporalmente acompañando una revisión de la justicia como valor y como fin esencial del Estado.

  1. Marco Martiniello, Penser l’ethnicité. Identité, culture et relation sociales

    OpenAIRE

    Rochereuil, Aurélie

    2013-01-01

    Les médias traitent fréquemment de violence ou de conflits dits « ethniques », ayant lieu en Europe ou dans d’autres pays du monde. Dans ce contexte, Marco Martiniello, directeur de recherches FNRS et directeur du Centre d’études de l’ethnicité et des migrations de l’Université de Liège, nous offre « un examen du concept d’ethnicité ». Cet ouvrage permet de comprendre dans quelle mesure les sciences sociales peuvent parler de l’ethnicité et l’étudier. Marco Martiniello définit l’ethnicité, se...

  2. Marco jurídico de la política de telecomunicaciones

    OpenAIRE

    Carlos Labaure Aliseris

    2014-01-01

    Introducción. Generalidades. Concepto de telecomunicación. Monopolio y competencia. Políticade telecomunicaciones. Noción e instrumentos. Evolución de las políticas de telecomunicaciones. Marco jurídico de las telecomunicaciones. Régimen general. Regímenes específicos.Nos vamos a referir al marco jurídico de la política de telecomunicaciones. Se trata de una regulación sectorial, fijada por el Estado, para una actividad en que actúan sujetos públicos y privados.Dicha regulación ha estado suje...

  3. Marco Común Europeo de Referencia en el Aprendizaje de Lenguas Extranjeras

    OpenAIRE

    Díaz-Corralejo, Joaquín

    2003-01-01

    En 1990, el Consejo de Europa propuso a varios paises la experimentación del nuevo entorno metodológico para la enseñanza / aprendizaje de las lenguas en el siglo XXI: el Marco Común Europeo de Referencia para el Aprendizaje, la Enseñanza y la Evaluación de las lenguas extranjeras. Más de quince países respondieron a este reto, España no estaba entre ellos. En 2001, se presenta la traducción al español de dicho Marco. El presente articulo se centra en la descripción de los fimdamentos meto...

  4. 3D scanning and printing as conversation tools: an innovative treatment of a vandalized bronze statue, The Thinker by Rodin

    NARCIS (Netherlands)

    T. Beentjes; R. van der Molen

    2011-01-01

    This contribution discusses the innovative treatment of a severely vandalized bronze sculpture, The Thinker by Auguste Rodin, from the Singer Museum in Laren, The Netherlands. Additional aspects of this controversial treatment such as decision making and documentation are also discussed. In 2007 the

  5. Ecología política y agroecología: marcos cognitivos y diseño institucional

    OpenAIRE

    Garrido Peña, Francisco

    2011-01-01

    La ideología política y el modelo institucional producen “marcos cognitivos” y “marcos institucionales” que favorecen uno u otro tipo de elecciones y conductas. La Ecología Política como generadora de marcos cognitivos (ideología) y marcos institucionales (normas y programas de gobierno). En este trabajo tratamos de identificar las virtualidades que para el desarrollo de la agroecología tiene el contar con marco cognitivos e institucionales afines como los que proponen la Ecolo...

  6. Florida’s primary results: a boring story with a sad ending for Senator Marco Rubio

    OpenAIRE

    Darlington, Rolda L.

    2016-01-01

    With 99 delegates, Florida is one of the most important states in this stage of the presidential primary season. Tuesday’s Republican primary saw Donald Trump win all but one of the Sunshine State’s 67 counties, and all of its delegates. Rolda L. Darlington writes that while the results were not surprising, they were devastating for the state’s US Senator Marco Rubio, who had been banking on a win there to stay in the presidential nomination race.

  7. Genetic variants of MARCO are associated with susceptibility to pulmonary tuberculosis in a Gambian population

    OpenAIRE

    Lack, Nathan A.; Bowdish, Dawn M. E.; Sakamoto, Kaori; Hill, Philip C.; Sirugo, Giorgio; Newport, Melanie J.; Gordon, Siamon; Hill, Adrian V. S.; Vannberg, Fredrick O.

    2013-01-01

    Background The two major class A scavenger receptors are scavenger receptor A (SRA), which is constitutively expressed on most macrophage populations, and macrophage receptor with collagenous structure (MARCO), which is constitutively expressed on a more restricted subset of macrophages, (e.g. alveolar macrophages) but whose expression increases on most macrophages during the course of infection. Although the primary role of SRA appears to be clearance of modified host proteins and lipids,...

  8. Kaasaegses kunstis valitseb turvalisus / Marco Scotini, Andris Brinkmanis ; intervjueerinud Eero Epner

    Index Scriptorium Estoniae

    Scotini, Marco, 1964-

    2010-01-01

    Intervjuu Milano Nuova Accademia di Belle Art'i visuaalkunstide ja kuraatoriõppe osakonna juhataja, kaasaegse kunsti ajaloo ja kuraatoriõppe professori Marco Scotini ja sama akadeemia õppejõu Andris Birkmanisega. M. Scotini pidas Kumus loengu "Kuraator loomemajanduse ajastul. Teisel pool institutsionaalset kriitikat". Muutunud kaasaja kunstimaailmast: institutsioonide kontrollist, estetiseeritud kunsti valitsemisest biennaalidel, riigi kontrollimehhanismi asendumisest majanduslikuga, kuraatoritööst, retrospektiivnäituste rohkusest jm.

  9. A Note on the 'Medieval' Passion Liturgy in San Marco, Venice, in the Eighteenth Century

    DEFF Research Database (Denmark)

    Petersen, Nils Holger

    2008-01-01

    Begravelsen af hostien langfredag eftermiddag i San Marco foregik på stort set samme måde fra det 16. til det 18. århundrede. Og dog er der mindre ændringer, der på én gang kaster lys over og vanskeliggør forståelsen af transmissionen af denne ceremoni i disse århundreder. Artiklen diskuterer - på...

  10. PRIDE and MarcoPolo-R: VLBI applications for Near-Earth Asteroids science

    Science.gov (United States)

    Cimo, G.; Molera-Calves, G.; Duev, D. A.; Pogrebenko, S. V.; Bocanegra Bahamon, T.

    2012-09-01

    The core of the Planetary Radio Interferometry and Doppler Experiment (PRIDE) is the accurate estimation of the state-vector of a spacecraft using Very Long Baseline Interferometry (VLBI) tracking. In this contribution, we will describe the technique and the technical requirements as well as the multidisciplinary scientific outcome of PRIDE as a part of the ESA mission MarcoPolo-R towards the Near-Earth Asteroids.

  11. Intoxication by mining revenues. San Marcos district politics after twelve years of Antamina’s presence

    Directory of Open Access Journals (Sweden)

    Guillermo Salas Carreño

    2010-12-01

    Full Text Available This paper describes and analyses the changes in local politicstaken place in the district of San Marcos (Huari, Ancash associatedwith the arrival of the Canon Minero – a fraction of taxes paid byAntamina mining company to the Peruvian State. Canon Minero hasincreased sudden and spectacularly the municipality’s funds so muchthat currently San Marcos in «ones of the Peruvian richest districts».The paper pays attention to the municipal elections of 2006 and theimplementation of the Plan Piloto de Mantenimiento de la InfraestructuraPública, a program of temporary work for all San Marcos’citizens. The latter was key for launching a novel alliance betweenthe municipality and the rural population, particularly with the ConoSur composed by hamlets which were traditionally unimportantactors in district politics. Hence, district politics had stopped to bedominated by the struggle between two factions of former landlordfamilies and had become articulated by the opposition between therural hamlets and the town of San Marcos with the emergence ofethnic political claims. Also, local politics ceased to revolve aroundAntamina and has become entangled with struggles over the administrationof Canon Minero. Rural communities which have directnegotiations with Antamina remain important political actors whichare independent from the municipality and are even oppose to it.

  12. THE RELATIONSHIP BETWEEN EGYPT AND PALESTINE IN THE MIDDLE BRONZE AGE (CA.2000-1550/1500 BCE.)

    Institute of Scientific and Technical Information of China (English)

    GuoDantong

    2004-01-01

    The relationship between Egypt and Palestine during the Bronze Age has been discussed since the 1940s. For the period of the Middle Bronze Age, the problem is both chronological and interpretative. The end of the Middle Bronze Age is fixed by the initial military activities of Dynasty 18 in Palestine around the end of the 16th century BCE. But the dates for the beginning of this period and the transition from one archaeological phase to another are still debated. Lacking a generally accepted solution, the chronology adopted here is that of Dever --- the transition from MB Ⅰ to MB Ⅱ occurred around 1800 BCE,

  13. Neopentecostalismo na mentalidade do povo brasileiro: um deslocamento da fé para o mercado

    OpenAIRE

    Paulo Passos

    2010-01-01

    A ascensão das denominações pentecostais no mercado formal da religiosidade brasileira simboliza uma verdadeira quebra de paradigmas. Da marginalidade, do estigma de “seita” que caracteriza este segmento, passaram a ocupar um plano privilegiado no campo econômico e espiritual. Essa exponencial visibilidade social em detrimento de outras denominações religiosas, sobretudo da católica, baliza o marco contextual dessa pesquisa.  Entremeio a uma inusitada percepção espiritual da pós-modernidade, ...

  14. Use of portable X-ray fluorescence instrument for bulk alloy analysis on low corroded indoor bronzes

    Energy Technology Data Exchange (ETDEWEB)

    Šatović, D., E-mail: dsatovic@alu.hr [Department of Conservation and Restoration, Academy of Fine Arts, Ilica 85, 10000 Zagreb (Croatia); Desnica, V. [Department of Conservation and Restoration, Academy of Fine Arts, Ilica 85, 10000 Zagreb (Croatia); Fazinić, S. [Laboratory for Ion Beam Interactions, Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb (Croatia)

    2013-11-01

    One of the most often used non-destructive methods for elemental analysis when performing field measurements on bronze sculptures is X-ray fluorescence (XRF) analysis based on portable instrumentation. However, when performing routine in-situ XRF analysis on corroded objects obtained results are sometimes considerably influenced by the corrosion surface products. In this work the suitability of portable XRF for bulk analysis of low corroded bronzes, which were initially precisely characterized using sophisticated and reliable laboratory methods, was investigated and some improvements in measuring technique and data processing were given. Artificially corroded bronze samples were analyzed by a portable XRF instrument using the same methodology and procedures as when performing in-situ analysis on real objects. The samples were first investigated using sophisticated complementary laboratory techniques: Scanning Electron Microscopy, Proton-Induced X-ray Emission Spectroscopy and Rutherford Backscattering Spectrometry, in order to gain precise information on the formation of the corrosion product layers and in-depth elemental profile of corrosion layers for different aging parameters. It has been shown that for corrosion layers of up to ca. 25 μm a portable XRF can yield very accurate quantification results. - Highlights: • XRF quantification is very accurate for bronze corrosion layers of up to ca. 25 μm. • Corrosion layer formation on bronze described in two phases. • Corrosion layers precisely characterized using PIXE, RBS and SEM. • Corrosion approximated as CuO for layer thickness calculations via X-ray attenuations • Increasingly lighter corrosion matrix may cause SnLα radiation intensity inversion.

  15. Uranium-series isotopes transport in surface, vadose and ground waters at San Marcos uranium bearing basin, Chihuahua, Mexico

    International Nuclear Information System (INIS)

    In the U deposit area at San Marcos in Chihuahua, Mexico, hydrogeological and climatic conditions are very similar to the Nopal I, Peña Blanca U deposit, 50 km away. The physicochemical parameters and activity concentrations of several 238U-series isotopes have been determined in surface, vadose and ground waters at San Marcos. The application of some published models to activity ratios of these isotopes has allowed assessing the order of magnitude of transport parameters in the area. Resulting retardation factors in San Marcos area are Rf238 ≈ 250–14,000 for the unsaturated zone and ≈110–1100 for the saturated zone. The results confirm that the mobility of U in San Marcos is also similar to that of the Nopal I U deposit and this area can be considered as a natural analog of areas suitable for geologic repositories of high-level nuclear waste.

  16. INSPIRE and MarCO - Technology Development for the First Deep Space CubeSats

    Science.gov (United States)

    Klesh, Andrew

    2016-07-01

    INSPIRE (Interplanetary NanoSpacecraft Pathfinder In a Relevant Environment) and MarCO (Mars Cube One) will open the door for tiny spacecraft to explore the solar system. INSPIRE serves as a trailblazer, designed to demonstrate new technology needed for deep space. MarCO will open the door for NanoSpacecraft to serve in support roles for much larger primary missions - in this case, providing a real-time relay of for the InSight project and will likely be the first CubeSats to reach deep space. Together, these four spacecraft (two for each mission) enable fundamental science objectives to be met with tiny vehicles. Originally designed for a March, 2016 launch with the InSight mission to Mars, the MarCO spacecraft are now complete and in storage. When launched with the InSight lander from Vandenberg Air Force Base, the spacecraft will begin a 6.5 month cruise to Mars. Soon after InSight itself separates from the upper stage of the launch vehicle, the two MarCO CubeSats will deploy and independently fly to Mars to support telecommunications relay for InSight's entry, descent, and landing sequence. These spacecraft will have onboard capability for deep space trajectory correction maneuvers; high-speed direct-to-Earth & DSN-compatible communications; an advanced navigation transponder; a large deployable reflect-array high gain antenna; and a robust software suite. This talk will present an overview of the INSPIRE and MarCO projects, including a concept of operations, details of the spacecraft and subsystem design, and lessons learned from integration and test. Finally, the talk will outline how lessons from these spacecraft are already being utilized in the next generation of interplanetary CubeSats, as well as a brief vision of their applicability for solar system exploration. The research described here was carried out at the Jet Propulsion Laboratory, Caltech, under a contract with the National Aeronautics and Space Administration (NASA).

  17. Settlement and landscape history of the Northern Franconian Jura during the Bronze and Iron Ages

    Science.gov (United States)

    Kothieringer, Katja; Lambers, Karsten; Seregély, Timo; Schäfer, Andreas

    2014-05-01

    This paper describes the results of initial archaeological and geoarchaeological fieldwork in the Northern Franconian Jura between the cities of Bayreuth and Bamberg. Our research aims at the reconstruction of settlement patterns and strategies of land use during the Metal Ages (Bronze Age and Iron Age) in the catchment area of the river Weismain. The project is designed as a case study for research into the settlement and landscape history of a rural region of the Central German Uplands during the last two millennia before our era. During the Bronze Age and Iron Age (about 2.100 BC to 30 BC), the Northern Franconian Jura must have been densely populated, as evidenced by numerous burial monuments, prominent hillforts like the Staffelberg, and ritual places on the Jurassic plateau. However, little is known about small rural settlements and hamlets which would have accounted for most of the settlement activity in the region. Thus, we lack the most important element for understanding the cultural history and development of the region as well as the consequences of human impact on the landscape. This impact must have induced changes in vegetation and subsequent erosion processes, leading to the formation of geoarchives like colluvial layers. During our initial fieldwork we identified such colluvial layers in depressions on the Jurassic plateau or at footslope positions. As radiocarbon datings of charcoal fragments showed, some of them date from the Metal Ages. The type is wood of these charcoal fragments is oak, which recently only occurs sporadically in mixed forests with beeches. The quantification of the shift of sediments from the plateau to the valleys will be the next important step of geoarchaeological research. Thus, investigations both on the plateau and in the river valleys will accompany archaeological survey. Apart from landscape reconstruction, they will also provide information on the state of preservation and the conditions for identifying archaeological

  18. GPR Surveys for Archaeological Investigation in a Bronze Age site from NW Portugal

    Science.gov (United States)

    Gonçalves, L.; Sampaio, H. A.; Bettencourt, A. M. S.; Alves, M. I. C.

    2012-04-01

    This work describes the use of Ground-penetrating Radar (GPR) surveys in the identification and mapping of subtle cultural remains, from Pego Late Bronze Age settlement, located near the city of Braga, in NW Portugal. Bronze Age settlements from NW Portugal are characterized by the presence archaeological structures such as storage pits, postholes and trenches. These subtle structures have a very low dielectric contrast, making them quite difficult to detect in GPR surveys. In the case of Pego Site, previous investigations using conventional archaeological techniques, during a rescue excavation, partially revealed a residential area, a necropolis, and a stockade foundation trench that encircle the whole settlement. Different GPR prospection approaches were performed using GSSI Sir 3000 System, with 400 MHz antennae, with the objective of identify and define the borders between the different areas of human occupation inside the settlement. For the GPR survey, a grid-based approach with closely spaced parallels transects was defined, covering different areas inside the site. A first survey was conducted with a pseudo-3D methodology, with 50 cm profile separation, followed by a second survey with a dense data acquisition methodology, with 10 cm profile separation. Processed two-dimensional GPR profiles and constructed amplituded-slice maps were produced and analysed. Wave velocities were determined by reflected wave methods and by Hyperbola-Fitting method. The background analysis of the archaeological and geological features of the site, integrated with the preliminary interpretation of GPR data (profiles and amplitude slice-maps) suggest the presence of flat graves, in the west part of the site, and storage pits, post holes and some small trenches, in the centre and north area of the settlement. This interpretation indicates that the settlement is individualized in two different areas, a necropolis and a residential area, such as the first archaeological study

  19. Armorican arrowhead biographies: Production and function of an Early Bronze Age prestige good from Brittany (France

    Directory of Open Access Journals (Sweden)

    Clément Nicolas

    2014-09-01

    Full Text Available Brittany can pride itself on the Armorican arrowheads found in Early Bronze Age graves (2150-1700 BC. In the present state of knowledge, these are the only specialized craft products in knapped flint produced in this region at the western edge of continental Europe. Admired since the 19th century, these flint arrowheads have never really been studied. Due to the wealth of graves and grave-goods, a relatively precise study can be undertaken of the development of these craft products, despite the low number of reliable radiocarbon dates.These arrowheads are characterized by a well-defined type (pointed tang and oblique barbs most often combined with ogival form. Raw materials show the selection of a high quality yellow translucent flint, of which the origin has to be sought at more than 400 kilometers (Lower Turonian flint from Cher Valley. From a technical point of view, Armorican arrowheads reveal a great mastery of retouch by pressure-flaking. This skill is written in stone by the perfection of forms, the extreme thinness (until 2,5 mm thick and very long barbs (until 25 mm long. Such work could not have been done without the use of copper, even bronze, awls. Moreover, some marks may testify to the implication of these tools. On 549 arrowheads that have reached to us, none of them presents diagnostical impact features. However, use-wear analysis indicates that most of them were hafted (adhesive traces, bright spots, blunt edges. These facts suggest that they are less functional arrowheads than objects for the show. In the graves, Armorican arrowheads are frequently set down carefully in wooden boxes taking the shaft off.The Armorican arrowheads with their exotic raw materials, their high-degree of technicality, and their absence of use, have all features of a prestige good. They have been discovered by dozens in few graves under barrows with very rich funeral items (bronze daggers decorated with golden pins, precious bracers, silver beakers

  20. Earthquake and the Catastrophic End of the Late Bronze Age in the Eastern Mediterranean

    Science.gov (United States)

    Nur, A.

    2009-04-01

    The reasons for the catastrophic and wide spread political as well as physical collapse in the Aegean and Eastern Mediterranean areas that define the end of the Bronze age ca. 1225 BC to 1175 BC remain a major enigma. It has been attributed by historian to attacks by outsiders with the most favored group being the (enigmatic) so-called sea people. Unfortunately there is no real evidence for this. However combined geological, geophysical and archaeological evidence suggests that earthquakes may have played a key role in this extraordinary collapse during the late 13th and early 12th centuries . Based on the instrumentally recorded earthquakes occurring in the Aegean and Eastern Mediterranean region during the 20th century, several events that have clear historical information, and the geography of seismically active faults it is obvious that numerous earthquakes of magnitude 6·5 or greater (enough to destroy modern buildings, let alone those of antiquity) occurred here frequently in the past. Furthermore major earthquakes often occur in this region in groups, known as ‘‘sequences'' or ‘‘storms'', in which one large quake is followed days, months, or a few years later by others elsewhere on the plate boundary fault lines. When a map of the areas in the Aegean and Eastern Mediterranean region shaken by 20th century  earthquakes of magnitude 6·5 and greater and with an intensity of VII or greater is overlaid on Robert Drews' map of sites destroyed in these same regions during the so-called ‘‘Catastrophe'' near the end of the Late Bronze Age, it is readily apparent that virtually all of these LBA sites lie within the affected (‘‘high-shaking'') areas. This would suggest that a major ‘‘earthquake storm'' may have occurred in the Late Bronze Age Aegean and Eastern Mediterranean during the years 1225-1175 . This ‘‘storm'' may have interacted with societal, political and economic forces at work in these areas c. 1200  and

  1. Crystallographic conditions for the initiation of cavitation erosion in CuMn11Al11 bronze

    Directory of Open Access Journals (Sweden)

    D. Zasada

    2008-09-01

    Full Text Available Purpose: The basic aim of this paper is to examine and present specific destruction processes connected with cavitation erosion of multi-component Cu-Mn-Al bronzes. In technical operational conditions these processes are ‘masked’ by the effects of electrochemical corrosion phenomena. However, these destructive processes may significantly accelerate the destruction of flow devices and marine propulsion systems. The essential phenomena occurring during these processes are incubation and propagation of brittle cracks in the planes of cleavage planes of the ordered phase β (Cu3Mn2Al that occurs in the examined group of alloys. Additional purpose is the assessment of possible applications of alloys with single-phase structure of intermetallic phases as model materials for research into erosion-cavitation resistance.Design/methodology/approach: This work presents research results concerning erosion cavitation resistance of a model alloy examined at a cavitation jet stand. The destructed areas were examined by gravimetric methods and those using scanning microscopy combined with computer image analysis. As the test materials used were single phase model alloys with the composition simulating selected phase components of Cu-Mn-Al bronzes, it was possible to examine erosion cavitation phenomena in the conditions of minimized effect of electrochemical phenomena.Findings: It has been found that at the initial period of destruction of the phase β in multi-component Mn-Al bronzes the prevailing form of destruction was a classical attack along grain boundaries, starting from the grain boundary junctions while in cases where the Cu3Mn2Al superstructure was present, the major mechanism of the incubation of erosion cavitation damage in the phase β is brittle cracking along cleavage planes {001} oriented at 45° angle to the exposed surface.Research limitations/implications: An essential problem is the verification of the results obtained using the

  2. Structural Analysis and Electrical Property of Tungsten Bronze Prepared by Rare Earth Gaseous Permeation

    Institute of Scientific and Technical Information of China (English)

    李中华; 李昕; 陈刚; 苏铭汉; 韦永德

    2004-01-01

    The cubic sodium tungsten bronzes, NaxWO3(x=0.854 and 0.814)were prepared by rare earths gaseous permeation method. Structural analysis was carried out by Rietveld method from powder X-ray diffraction data. The X-ray diffraction profile calculated with cubic P32 models are in good agreement with the observed X-ray diffraction patterns. There is only a little difference in W-O bond and Na-O bond between Na0.854WO3 and Na0.814WO3. Conductivity measurements indicate that NaxWO3 show anomalous semiconducting behavior and percolation model was used to interpret it.

  3. Influence of precipitate size and morphology on grain refinement in nickel aluminium bronze

    Science.gov (United States)

    Barr, C. J.; Xia, K.

    2015-08-01

    Nickel aluminium bronze (NAB) was subjected to equal channel angular pressing (ECAP) using routes BA and C at 400°C to investigate the effect of precipitate size and morphology on grain refinement in low stacking fault energy alloys. Both routes produced dynamically recrystallised grains of ∼550 nm in size although only route BA was able to create a uniform distribution of the refined grains. The large unrefined regions in NAB processed via route C was thought to arise from its inability to redistribute the various precipitate phases, as recrystallisation was enhanced around the coarse κII rosettes and refined κIII lamellae but reduced in the areas containing fine κIV precipitates.

  4. Aromatic quinoxaline as corrosion inhibitor for bronze in aqueous chloride solution

    Indian Academy of Sciences (India)

    N Saoudi; A Bellaouchou; A Guenbour; A Ben Bachir; E M Essassi; M El Achouri

    2010-06-01

    A new corrosion inhibitor, viz. 3-ethyl-6-méthyl-quinoxalin-2-one, 1-benzyl-6-methyl-quinoxalin- 2-one, 2-benzyloxy-3,6-dimethyl-quinoxaline, 1-benzyl-3-methyl-quinoxalin-2-one, were synthesized in the laboratory. Their influence on the inhibition on corrosion of bronze in aqueous chloride solution (3% NaCl) was studied by electrochemical polarization methods and weight-loss measurements. The impact of temperature on the effectiveness of the substances mentioned above has been determined between 20 and 60°C. The results showed that the corrosion resistance was greatly enhanced in the presence of inhibitor and that the effectiveness depends on some physicochemical properties of the molecule, related to its functional groups. These compounds act through the formation of a protective film on the surface of the alloy.

  5. Paysages funéraires de l’âge du Bronze

    OpenAIRE

    Gomez de  Soto, José

    2015-01-01

    Du 15 au 18 octobre 2008 s’est tenu au musée de Herne en Westphalie un colloque international intitulé « Gräberlandschaften der Bronzezeit. Paysages funéraires de l’âge du Bronze ». Cette manifestation s’insère dans une succession de colloques bi-annuels inaugurée par celui sur le RSFO tenu à Nemours en 1986. Les actes, qui viennent de paraître, réunissent trente-sept contributions, rédigées en allemand, en français ou en anglais. Les résumés, donnés dans les trois langues, permettront à ceux...

  6. Studies of solids at low temperatures. Final scientific report. [Fluoro-tungsten bronzes

    Energy Technology Data Exchange (ETDEWEB)

    Moulton, W.G.

    1970-10-01

    One of the primary objectives of this research has been to investigate the magnetic properties of materials which are likely to exhibit unusual magnetic transitions which may prove to be useful for microwave or switching devices. Experimental techniques used in this research included nuclear magnetic resonance, magnetic susceptibility measurements, optical spectroscopy, and electron spin resonance. A second goal was to develop relationships between magnetic properties and chemical bonding so that eventually magnetic properties could be predicted from the structure of a compound. Another objective of this research was to investigate the possibility of superconductivity in the fluoro-tungsten bronzes. Forty-two of these compounds were synthesized and all were found to have superconducting transition temperatures between one and one half degrees and five degrees kelvin. Relationships between the critical fields and the transition temperature and the composition have been established.

  7. Performance evaluation of grid-enabled registration algorithms using bronze-standards

    CERN Document Server

    Glatard, T; Montagnat, J

    2006-01-01

    Evaluating registration algorithms is difficult due to the lack of gold standard in most clinical procedures. The bronze standard is a real-data based statistical method providing an alternative registration reference through a computationally intensive image database registration procedure. We propose in this paper an efficient implementation of this method through a grid-interfaced workflow enactor enabling the concurrent processing of hundreds of image registrations in a couple of hours only. The performances of two different grid infrastructures were compared. We computed the accuracy of 4 different rigid registration algorithms on longitudinal MRI images of brain tumors. Results showed an average subvoxel accuracy of 0.4 mm and 0.15 degrees in rotation.

  8. Strengthening Mechanisms in NiAl Bronze: Hot Deformation by Rolling and Friction-Stir Processing

    Science.gov (United States)

    Menon, Sarath K.; Pierce, Frank A.; Rosemark, Brian P.; Oh-Ishi, Keiichiro; Swaminathan, Srinivasan; McNelley, Terry R.

    2012-10-01

    Microstructures produced by isothermal hot rolling of a NiAl bronze material were evaluated by quantitative microscopy methods and parameters describing the contributions of precipitate dispersions, grain size, solute content, and dislocation density to the yield strengths of the individual constituents of microstructure were determined. Models for the strengths of the individual constituents were combined to predict the temperature dependence of the yield strength as a function of hot rolling temperature, and the prediction was found to be in good agreement with measured yield strengths. The models were applied to microstructures in a stir zone produced by multipass friction-stir processing (FSP) and, again, found to predict measured yield strengths with high accuracy. Such models may aid in assessing the role of microstructure gradients produced during FSP and other processes.

  9. Silvery hair with bronze-tan in a child: A case of Elejalde disease

    Directory of Open Access Journals (Sweden)

    Inamadar Arun

    2007-01-01

    Full Text Available A 5-year-old boy was admitted for severe neurological impairment including hypotonia and loss of consciousness without preceding febrile illness. On examination, he had silver colored hair and bronze-tan over photo-exposed body parts. He was born of consanguineous parents and three of his elder siblings, who died in early childhood, had similar colored hair. Complete blood count and serum immunoglobulin levels were within normal limits. Peripheral blood smear did not show any cytoplasmic granules in neutrophils. Cerebro-spinal fluid examination did not reveal any abnormality. Light microscopic examination of the hair revealed irregular clumping of the melanin throughout the shafts. The patient died on the second day following admission. A clinical diagnosis of Elejalde disease was made. The clinical and genetic overlapping of the three silvery-hair syndromes has been discussed.

  10. Influence of heat treatment on tribological behaviors of novel wrought aluminum bronze

    Institute of Scientific and Technical Information of China (English)

    张卫文; 倪东惠; 夏伟; 邱诚; 陈维平

    2002-01-01

    Influence of heat treatment on mechanica l properties and tribologica l behaviors of Ti and B modified wrought aluminum bronze were studied. The res ults show that different strength and plasticity combination of the alloy after solu tion treatment can be obtained by adjusting the ageing temperature. When aged at 45 0 ℃, the tensile strength σb, yield strength σ0.2, elongatio n δ and hardness of the alloy are 1 050 MPa, 780 MPa, 4.5%, HB282, respectively. When aged at 650 ℃, those of the alloy are 905 MPa, 600 MPa, 12%, HB232, respectively. Under boundary l ubri cation condition with pressure above 22.2 MPa, alloy with low temperature agei ng has the best wear property. However, under the condition involving impact or sh ock loading, alloy with high temperature ageing is preferable. If the load is no t heavy, the alloy under extrusion state is favorable for wear-resisting parts.

  11. A mineralogical study of Late Bronze Age ceramics from Palatca (Transylvania, Romania

    Directory of Open Access Journals (Sweden)

    Lucretia Ghergari

    2012-01-01

    Full Text Available Our paper studies the mineralogical and petrographical characteristics of 28 ceramic fragments that were excavated in the village of Palatca, Transylvania (Romania. Optical microscopy, X-Ray powder diffraction (XRD, scanning electron microscopy (SEM, grain size analyses, and porosity measurements were used to investigate the samples. Our objective was to describe or reconstruct the corresponding products and to elucidate the manufacturing process, the firing techniques, and the transformation pathways. Based on our results, we conclude that the Late Bronze Age ceramics (1600-1300 BC were produced from clay and temper material such as river sand and ceramoclasts. It has been modeled by hand and fired between 800 and 950°C. For most samples, we can narrow the temperature range to 850-900°C. We interpret the data further from a geoarchaeological point of view with respect to the historical evolution of the local culture.

  12. Corrosion atmosphérique des bronzes et Spectroscopie Mössbauer.

    OpenAIRE

    Sougrati, Moulay Tahar

    2008-01-01

    Afin d'améliorer la compréhension de la corrosion atmosphérique des bronzes, nous avons mis en oeuvre : - La caractérisation des composés d'étain, susceptibles d'être formés en corrosion atmosphérique, par une approche multi-analytique, la spectroscopie Mössbauer joue un rôle central (analyse sélective et quantitative). Les paramètres hyperfins et les facteurs Lamb-Mössbauer de plusieurs oxydes, sulfates et chlorures d'étain ont été déterminés. Les facteurs f sont dispersés et dépendants de t...

  13. Analysis of neutron diffraction profiles in bronze archaeological statuettes produced by solid lost wax casting

    Science.gov (United States)

    Giuliani, Alessandra; Fiori, Fabrizio; Gysens, Jacqueline; Manescu, Adrian; Rustichelli, Franco

    2008-03-01

    In the framework of a research aiming to assess the suitability of neutron/x-ray non-destructive techniques for the characterization of archaeological objects, two bronze items were studied by neutron diffraction. The origins of two small statues are, respectively, Egyptian (XXI-XXX Dynasties, c1070-343 B.C.) and Etruscan (IV-III centuries B.C.), belonging to a private collection. By hard x-ray diffraction we previously verified that both statuettes have a coarse microstructure (big grains). From historical considerations we believe that both items were produced by solid lost wax processes of casting. This processing technique does not completely justify the presence of microstrains; as a consequence, due to unexpected neutron diffraction peak broadening, a non-uniform Sn wt% is suspected. In the present work we discuss this deduction by means of Rietveld analysis of the neutron diffraction profiles.

  14. Combining X-ray based methods to study the protohistoric bronze technology in Western Iberia

    Energy Technology Data Exchange (ETDEWEB)

    Valério, P., E-mail: pvalerio@ctn.ist.utl.pt [Centro de Ciências e Tecnologias Nucleares (C2TN), Instituto Superior Técnico, Universidade de Lisboa, Campus Tecnológico e Nuclear, Estrada Nacional 10 (km 139,7), 2695-066 Bobadela LRS (Portugal); Silva, R.J.C., E-mail: rjcs@fct.unl.pt [CENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa, 2829-516 Monte de Caparica (Portugal); Soares, A.M.M., E-mail: amsoares@ctn.ist.utl.pt [Centro de Ciências e Tecnologias Nucleares (C2TN), Instituto Superior Técnico, Universidade de Lisboa, Campus Tecnológico e Nuclear, Estrada Nacional 10 (km 139,7), 2695-066 Bobadela LRS (Portugal); Araújo, M.F., E-mail: faraujo@ctn.ist.utl.pt [Centro de Ciências e Tecnologias Nucleares (C2TN), Instituto Superior Técnico, Universidade de Lisboa, Campus Tecnológico e Nuclear, Estrada Nacional 10 (km 139,7), 2695-066 Bobadela LRS (Portugal); Gonçalves, A.P., E-mail: apg@ctn.ist.utl.pt [Centro de Ciências e Tecnologias Nucleares (C2TN), Instituto Superior Técnico, Universidade de Lisboa, Campus Tecnológico e Nuclear, Estrada Nacional 10 (km 139,7), 2695-066 Bobadela LRS (Portugal); Soares, R.M., E-mail: ruigusmao@hotmail.com [UNIARQ, Centro de Arqueologia da Universidade de Lisboa, Faculdade de Letras, Alameda da Universidade, 1600-214 Lisboa (Portugal)

    2015-09-01

    The Phoenician arrival at Iberian coastal regions had an actual influence on indigenous technology. A collection of coeval metallurgical remains and artefacts was studied by EDXRF, micro-EDXRF, SEM–EDS and XRD, to identify certain features of the production and utilisation of metal in protohistoric Western Iberia. The composition of artefacts indicates a prevalence of Cu–Sn alloys with low content of impurities (Pb, As, Sb and Fe) during Late Bronze and Early Iron Ages, while the composition of slags points to a smaller loss of copper in Phoenician smelting operations. Moreover, the amount of iron impurities in metal proved to be a helpful discriminator between indigenous and Phoenician-based metallurgies, showing that later alloys have higher amounts of iron. Besides, the indigenous alloys have higher tin contents that can probably be explained by the easier access to metal sources of local communities.

  15. Towards mineralogical and geochemical reference groups for some Bronze Age ceramics 
from Transylvania (Romania

    Directory of Open Access Journals (Sweden)

    Volker Hoeck

    2009-09-01

    Full Text Available Based on their chemical composition ceramic shards from three Bronze Age sites in Transylvania, i.e., Copăceni, Derşida and Palatca respectively, were distinguished by major, trace, and RE elements. Within the Copăceni samples, two subgroups (A and B showing different chemistry and mineralogy were additionally separated out. The link between chemistry and mineralogy showed clearly the important contribution of the temper to the overall chemistry of the ceramic shards. In turn, the chemistry facilitated the provenance study of the raw materials, which were collected in the vicinity of the sites. In combination with the mineralogy of the ceramics, the chemical analyses can serve as a basis for a geochemical reference set used by further studies.

  16. marco organizacional

    Directory of Open Access Journals (Sweden)

    Juan David Velásquez H.

    2006-01-01

    Full Text Available Ha sido ampliamente reconocida la importancia de la predicción en la toma de decisiones, y se han encontrado evidencias de que uno de los métodos más efectivos es el ajuste de los pronósticos obtenidos a partir de modelos matemáticos usando juicios informados. No obstante, existe una amplia cantidad de factores que pueden afectar la calidad y credibilidad de las predicciones; en este trabajo se examinan aquellos factores relacionados con las políticas organizacionales, y se proponen varias estrategias para su mitigación.

  17. The inhibition effect and mechanism of L-cysteine on the corrosion of bronze covered with a CuCl patina

    International Nuclear Information System (INIS)

    Highlights: • CuCl patina was synthesized on bronze electrodes with electrochemical method. • L-cysteine was used as a green inhibitor for bronze covered with CuCl patina. • The inhibition efficiency reached above 90%. • The inhibition mechanism of L-cysteine on CuCl patina was investigated. - Abstract: CuCl patina was synthesized on bronze electrodes with electrochemical method. The inhibition effect and mechanism of L-cysteine (Cys) on bronze covered with CuCl patina have been studied with electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS) techniques. The EIS results show that Cys stabilized the CuCl patina to a great extent. The hydrolysis reaction of CuCl was inhibited effectively and an inhibition efficiency of over 90% was achieved. The XPS analyses indicate that the chemisorption of Cys molecules on CuCl surface occurred through sulfur atom in thiol and nitrogen atom in amino group

  18. Biological affinities and adaptations of Bronze Age Bactrians: IV. A craniometric investigation of Bactrian origins.

    Science.gov (United States)

    Hemphill, B E

    1999-02-01

    Discovery of a previously unknown Bronze Age civilization (Oxus civilization) centered on the oases of Central Asia revealed the presence of large, preplanned urban centers immediately above sterile soil. Given the absence of local antecedents, the sudden appearance and proliferation of these Oxus civilization urban centers in the oases of Bactria and Margiana immediately raised the issue of where the inhabitants of these urban centers came from. Three hypotheses have been offered by archaeologists to account for the origins of Oxus civilization populations. These include the early influence model, the late colonization model, and the trichotomy model. Eleven craniometric variables from 12 Aeneolithic and Bronze Age samples, encompassing 657 adults from Central Asia, Iran, and the Indus Valley, are compared to test which if any of these hypotheses are supported by the pattern of phenetic affinities possessed by the Oxus civilization inhabitants of the north Bactrian oasis. Craniometric differences between samples are compared with Mahalanobis generalized distance (d2), and patterns of phenetic affinity are assessed with two types of cluster analysis (WPGMA, neighbor-joining method), multidimensional scaling, and principal coordinates analysis. Results of this analysis provide no support for either the late colonization model or the trichotomy model but do offer some support for the early influence model. Nevertheless, it is clear that the early influence model fails to account for a shift in interregional contacts, perhaps from western China to the north around 2000 BC, that appears to have played a major role in the origins of the Oxus civilization inhabitants of the north Bactrian oasis. PMID:9988380

  19. Comparison of LIBS and {mu}-XRF measurements on bronze alloys for monitoring plasma effects

    Energy Technology Data Exchange (ETDEWEB)

    Alberghina, M F; Barraco, R; Brai, M; Schillaci, T; Tranchina, L, E-mail: tschillaci@unipa.it [Dipartimento di Fisica e Tecnologie Relative, Universita di Palermo, Viale delle Scienze Ed. 18, 90128 Palermo (Italy)

    2011-01-01

    The laser-induced breakdown spectroscopy (LIBS) technique is often used as atomic spectroscopic technique for elemental analysis of materials. However, it presents some drawbacks that make an accurate quantitative analysis difficult. Since the plasma properties, such as spatial inhomogeneity and plume stoichiometry strongly depend on the experimental conditions, the measurements are less reproducible. In order to evaluate the measurement fluctuations, we propose to use the more established micro X-Ray fluorescence ({mu}-XRF) technique for validating LIBS data. In particular, the quantitative data, obtained by varying the laser fluence, the shot numbers and the temporal acquisition parameters, were compared with those obtained by {mu}-XRF on laboratory made samples of binary, ternary and quaternary bronze alloys. For LIBS measurements a mobile double pulse laser instrument equipped with an high resolution Echelle type monochromator coupled to an intensified CCD camera was used. {mu}-XRF analyses were performed with a portable instrument that uses a micro collimated X-Ray beam and it is equipped with an high resolution detector. The LIBS results show a strong dependence both on the instrumental set up and the chemical-physical properties of the sample. With our findings we could identify the most suitable parameters to be used in the investigation of the different bronze alloys. The possibility to carry out a quantitative analysis by using the LIBS technique was checked through the comparison with related {mu}-XRF data. In particular in this paper we identified a set of reliable LIBS parameters for the quantitative analysis of copper, tin and zinc. Further analyses will be necessary to reach this goal also for the minor constituents as lead.

  20. Late Bronze Age in Alcáçova de Santarém (Portugal

    Directory of Open Access Journals (Sweden)

    Arruda, Ana Margarida

    2015-06-01

    Full Text Available The field work that took place in the restaurant area in Jardim das Portas do Sol (Alcáçova de Santarém recovered well-preserved archaeological layers dated to the Late Bronze Age, lying directly underneath the Iron Age phase. The excavation made it possible to collect an important set of ceramics that incorporate printed and incised decoration, which can be easily decoration related to the Cogotas 1 cultural background. Burnished decorations, with grooves on the inner surface and outer strips, are less common. The formal repertoire does not deviate from what is known about the Late Bronze Age in central and southern Iberian Peninsula. The data allow us to propose a chronology centered in the early 1st millennium BCE for this occupation.Durante los trabajos de campo, realizados en el área del restaurante del Jardim das Portas do Sol, se documentaron, por primera vez en Alcáçova de Santarém, niveles conservados del final de la Edad del Bronce, inmediatamente infrapuestos a los de la Edad del Hierro. Su excavación permitió recoger un conjunto de materiales cerámicos que incorpora varios fragmentos decorados por impresión e incisión, que pueden ser fácilmente relacionados con el universo cultural de Cogotas 1. Las decoraciones bruñidas con surcos en la superficie interna y con franjas al exterior son mucho menos frecuentes. El repertorio formal no difiere del conocido para el Bronce Final del centro y sur de la Península Ibérica. Los datos permiten proponer una cronologia del inicio del 1 milenio a.n.e. (siglo IX para esta ocupación.

  1. Bronze age cosmology and rock art images. Solar ships, deer and charts

    Science.gov (United States)

    Dimitriadis, G.

    Bronze Age societies were technologically complex. The impressive production of metal artefacts embodies clearly their astronomical culture and cosmological viewpoint. Same ascertainment is valid also for rock art. In fact, around the European landscape were discovered several cliffs engraved with solar ships, deer and charts. How one could be interpret them? Which is the hidden mentality? From the end of 3rd millennium-early 2nd millennium B. C. deep technological transformations are made by metals. New inventions such metal extraction for weapon production, horse pulling chariot used for war and the bull pulling one used for trade may shorten the culture and material distances between Central Europe and South Mediterranean area. Indeed, taphonomic studies indicate a specific modification of the human body mortuary traditional disposition (orientated to significant astronomical targets) below a substantial transformation of mortuary apparatus with spot evidence of weapons (halberds, swords, knifes) and ornaments (double spiral, lunar shape pectorals). The famous Trundhold Solar chart, the 2nd millennium terracotta chart form Dupljaja, the solar boats petroglyph in Bohusland and the horse rider carved on Philippi's cliffs were conceived by the same mentality: communion with the divinity. Culture expressions as communicate manifestation attested in rock art were produced by the same mentality presented in Bronze Age art-crafts such as, 1. Culture epidemiologic patterns dispersion took place through out iconographic motives, and, 2. Animals can play a double face function inside an analogical-mythological system: a. animal-reflex; b. animal-agent. The question is: Could such petroglyphs help us to "read" archaeoastronomical properly in an archaeological site?

  2. Archaeological fieldwork in the Bronze Age site of Cerro de la Encina (Monachil, Granada

    Directory of Open Access Journals (Sweden)

    Aranda Jiménez, Gonzalo

    2005-06-01

    Full Text Available New archaeological fieldwork has been carried out from November 2003 to May 2004 in the Bronze Age site of Cerro de la Encina, due to the interest of the regional government of Andalusia in displaying the settlement for visitors. The aim of this fieldwork has been the systematic excavation of a large settlement area partially known thanks to the excavations developed at the beginning of 1980s. A first toccupation period belonging to the Argaric Culture has been documented, highlighting specially the funerary ritual characterized by individual inhumations located below dwellings. After a gap in the occupation of the settlement a new social group belonging to the Late Bronze Age Culture of Southeast of Spain inhabits the Cerro de la Encina.

    El interés de la Consejería de Cultura de la Junta de Andalucía por la musealización del yacimiento del Cerro de la Encina ha motivado el desarrollo de nuevas investigaciones arqueológicas cuya primera fase se ha desarrollado entre Noviembre de 2003 y Mayo de 2004. Los trabajos han consistido en la excavación sistemática de un área de poblado de grandes dimensiones parcialmente conocida por las investigaciones realizadas a principios de los años 80. Los resultados han sido del máximo interés documentándose un primer momento de ocupación perteneciente a la Cultura de El Argar en el que destaca su espectacular registro funerario integrado dentro de las áreas de habitación. Tras un periodo de abandono del yacimiento se produce una nueva ocupación correspondiente a una comunidad del Bronce Final del Sureste.

  3. Effect of additions of Cr, Mo, W and/or Si on the technological properties of aluminum-iron-nickel bronze

    Directory of Open Access Journals (Sweden)

    B. P. Pisarek

    2011-07-01

    Full Text Available The aim of this study was to investigate the effect of additives of Cr, Mo, W and / or Si CuAl10Fe5Ni5 bronze, cast into sand moulds, the bronze technological properties such as: porosity, volumetric shrinkage Sv, linear shrinkage s and prone hot to cracking. The study relate to the newly developed grades aluminum-iron-nickel bronze, with additions of Cr, Mo, W and/or Si. In order to determine the technological properties of the test castings were made in the form of moulding sand, which made the mould cavities designed patterns. To evaluate the porosity and volumetric shrinkage was used for digital image analysis method. Volumetric shrinkage was determined using developed, the new method, the surface shrinkage Svp designation, and then converting it to the volumetric shrinkage, using prepared relation Sv=f(Djs*Svp. It was found that made the bronze alloy additions to reduce the size of pores surface area of gas and shrinkage in the test bronze. The probability of microporosity with an area of 0.002560÷0.120647 mm2 can be described by gamma distribution. Changing the chemical composition of the grades tested bronze strongly alter the first volumetric shrinkage Sv, and less to change the linear shrinkage s. The increase in gas porosity and shrink in bronze reduces the volumetric shrinkage and linear. The addition of Cr, Mo, W and/or Si to the bronze CuAl10Fe5Ni5 does not change its prone to hot cracking.

  4. Corrosion stability of different bronzes in simulsted urban rain: Korozijska stabilnost različnih bronov v umetnem kislem dežju:

    OpenAIRE

    Kosec, Tadeja; Kuhar, Viljem; Legat, Andraž; Švara Fabjan, Erika

    2011-01-01

    Copper and high copper alloys tend to passivate in humid air. In clean humid air, cuprite slowly transforms to black tenorite. If atmosphere contains aggressive species, acid rain might effect the formation of different corrosion products. The patina that forms upon exposure to urban acid rain also depends of the composition of the base alloy. In the present study three different alloys were investigated: leaded bronze, usually used for sculptures, unleaded bronze as an alloy without an impac...

  5. Marco legal do Programa Nacional de Alimentação Escolar: uma releitura para alinhar propósitos e prática na aquisição de alimentos

    Directory of Open Access Journals (Sweden)

    Carla Rosane Paz Arruda Teo

    2012-10-01

    Full Text Available Este ensaio pretende discutir a aquisição de alimentos para o Programa Nacional de Alimentação Escolar à luz do seu marco legal vigente, na perspectiva de promover hábitos alimentares saudáveis e culturalmente articulados que contribuam para a promoção das condições de saúde da população escolar brasileira e para o desenvolvimento local. Apresentase análise da legislação em vigor do Programa Nacional de Alimentação Escolar, evidenciando a intencionalidade de influenciar o sistema alimentar brasileiro e o padrão alimentar de sua população a partir da alimentação escolar, destacandose as lacunas que desafiam a efetivação de mudanças substanciais na execução do programa. Partindo dessa análise e com base no elevado e crescente consumo de alimentos ultraprocessados no Brasil, e considerando as desvantagens desses alimentos diante de alimentos pouco ou não processados, desenvolvese proposta para orientar a construção de uma pauta de alimentos que seja consistente com o marco legal vigente do programa e com seus objetivos. Argumentase que a predominância de alimentos pouco ou não processados na alimentação escolar pode ser estratégia para o resgate do patrimônio alimentar saudável e para o fortalecimento do desenvolvimento local se resultar da aproximação com a agricultura familiar.

  6. Les techniques de soudage de la grande statuaire antique en bronze: étude des paramètres thermiques et chimiques contrôlant le soudage par fusion au bronze liquide

    OpenAIRE

    Azéma, Aurélia

    2013-01-01

    Ces travaux s'inscrivent dans une recherche interdisciplinaire qui concerne l'évolution de l'ensemble des techniques de la grande statuaire antique en bronze (de la 2nd moitié du 6 siècle avant J.C. au 5e siècle après J.C.). L'objectif de la thèse est de contribuer à la compréhension du procédé de soudage par fusion au bronze liquide, en mettant en œuvre une double approche : étude de soudures antiques et essais expérimentaux en laboratoire. Les statues à étudier ont été choisies parmi les œu...

  7. Uranium series isotopes concentration in sediments at San Marcos and Luis L. Leon reservoirs, Chihuahua, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Méndez-García, C.; Montero-Cabrera, M. E., E-mail: elena.montero@cimav.edu.mx [Centro de Investigación en Materiales Avanzados, CIMAV, Miguel de Cervantes 120, 31109, Chihuahua, Chihuahua (Mexico); Renteria-Villalobos, M. [Facultad de Zootecnia y Ecología Universidad Autónoma de Chihuahua, Periferico Francisco R. Almada Km 1, 31410, Chihuahua (Mexico); García-Tenorio, R. [Applied Nuclear Physics Group, University of Seville, ETS Arquitectura, Avda. Reina Mercedes s/n, 41012 Seville (Spain)

    2008-01-01

    Spatial and temporal distribution of the radioisotopes concentrations were determined in sediments near the surface and core samples extracted from two reservoirs located in an arid region close to Chihuahua City, Mexico. At San Marcos reservoir one core was studied, while from Luis L. Leon reservoir one core from the entrance and another one close to the wall were investigated. ²³²Th-series, ²³⁸U-series, ⁴⁰K and ¹³⁷Cs activity concentrations (AC, Bq kg⁻¹) were determined by gamma spectrometry with a high purity Ge detector. ²³⁸U and ²³⁴U ACs were obtained by liquid scintillation and alpha spectrometry with a surface barrier detector. Dating of core sediments was performed applying CRS method to ²¹⁰Pb activities. Results were verified by ¹³⁷Cs AC. Resulting activity concentrations were compared among corresponding surface and core sediments. High ²³⁸U-series AC values were found in sediments from San Marcos reservoir, because this site is located close to the Victorino uranium deposit. Low AC values found in Luis L. Leon reservoir suggest that the uranium present in the source of the Sacramento – Chuviscar Rivers is not transported up to the Conchos River. Activity ratios (AR) ²³⁴U/²³⁸U and ²³⁸U/²²⁶Ra in sediments have values between 0.9–1.2, showing a behavior close to radioactive equilibrium in the entire basin. ²³²Th/²³⁸U, ²²⁸Ra/²²⁶Ra ARs are witnesses of the different geological origin of sediments from San Marcos and Luis L. Leon reservoirs.

  8. Uranium series isotopes concentration in sediments at San Marcos and Luis L. Leon reservoirs, Chihuahua, Mexico

    International Nuclear Information System (INIS)

    Spatial and temporal distribution of the radioisotopes concentrations were determined in sediments near the surface and core samples extracted from two reservoirs located in an arid region close to Chihuahua City, Mexico. At San Marcos reservoir one core was studied, while from Luis L. Leon reservoir one core from the entrance and another one close to the wall were investigated. 232Th-series, 238U-series, 40K and 137Cs activity concentrations (AC, Bq kg−1) were determined by gamma spectrometry with a high purity Ge detector. 238U and 234U ACs were obtained by liquid scintillation and alpha spectrometry with a surface barrier detector. Dating of core sediments was performed applying CRS method to 210Pb activities. Results were verified by 137Cs AC. Resulting activity concentrations were compared among corresponding surface and core sediments. High 238U-series AC values were found in sediments from San Marcos reservoir, because this site is located close to the Victorino uranium deposit. Low AC values found in Luis L. Leon reservoir suggest that the uranium present in the source of the Sacramento – Chuviscar Rivers is not transported up to the Conchos River. Activity ratios (AR) 234U/238U and 238U/226Ra in sediments have values between 0.9–1.2, showing a behavior close to radioactive equilibrium in the entire basin. 232Th/238U, 228Ra/226Ra ARs are witnesses of the different geological origin of sediments from San Marcos and Luis L. Leon reservoirs

  9. Promoción de la lectura en el marco educativo

    Directory of Open Access Journals (Sweden)

    Maite Monar van Vliet

    2012-01-01

    Full Text Available La investigación ofrece una visión teóricopráctica de la promoción de la lectura en un marco educativo concreto. Por una parte, se muestra el estado de la cuestión centrándose en el marco legislativo, la investigación y la promoción de la lectura virtual y, más en concreto, en el caso del País Valenciano, donde se ubica la investigación práctica llevada a cabo. A partir de la UNESCO, la LOE y los planes de lectura se plantea una panorámica de la legislación actual. Diferentes estudios realizados por especialistas en la materia enriquecen la visión y con las plataformas virtuales se completa la descripción teórica planteada. Por otra parte, se realiza un trabajo de campo cualitativo con el objetivo de evaluar los beneficios de la web, el blog y el wiki en el aula para la promoción lectora durante el curso escolar 2010-2011 con tres grupos de tres centros diferentes. El trabajo consiste en observar la aplicación de las plataformas digitales para la promoción de la lectura en el aula y en analizar su utilidad a través del estudio de casos, el grupo de discusión y la triangulación. La investigación concluye con unas reflexiones que invitan al lector a acercarse a la promoción de la lectura en el marco educativo con tecnologías virtuales.

  10. Violencia en el marco escolar de la enseñanza obligatoria : el profesorado como referencia

    OpenAIRE

    Rodríguez Díaz, Francisco Javier; Gutiérrez, Cristina; Herrero Díez, Francisco Javier; Cuesta Izquierdo, Marcelino; Hernández Granda, Eva; Carbonero, Patricia G.; Jiménez, Asunción

    2002-01-01

    El objetivo de este trabaja es explorar las posibles conductas violentas que aparecen en el aula o en el centro educativo a partir de referencias de profesorado en el marco escotar de la enseñanza obligatoria. De esta manera, a través de una muestra de 69 profesores (40`70 hombres y con una media de 40, 5 años) de la Enseñanza Obligatoria (Primaria y Secundaria), que cubrieron de forma anónima un cuestionario específico para el estudio de la Incidencia del Maltratan entre Iguales (Defensor de...

  11. Las Inteligencias Múltiples como marco para atender a los alumnos con adaptaciones curriculares no significativas

    OpenAIRE

    Martí-Saumell, Núria

    2012-01-01

    Nuestra investigación se centra en estudiar las metodologías educativas que facilitan la atención a la diversidad desde la perspectiva de la Teoría de las Inteligencias Múltiples y con una orientación teórico-práctica. El objetivo de nuestro estudio será analizar y seleccionar aquellas metodologías educativas que facilitan la atención a la diversidad dentro del aula, así como analizar el marco que ofrece la Teoría de las Inteligencias Múltiples para atender a la diversidad. A partir de estos ...

  12. LA RECOGIDA DE BASURA EN MEGA-CIUDADES: En el marco de la sostenibilidad

    OpenAIRE

    Fabian Tron

    2010-01-01

    La comprensión de las sociedades urbanas complejas sólo es posible cuando se estudia tanto el sector formal como el informal que las conforma. Para explicar ambos modelos, el rubro de los Residuos surge como una de las herramientas más competentes, capaz de distinguir entre ellos, incluso cuando la demanda de la sociedad supera su marco legislativo. Un cambio de enfoque en el que se defi ne a los residuos sólidos en función a su potencial como recurso, contextualiza realidades muy divergentes...

  13. Auditoría de alineamiento con el Marco europeo de interoperabilidad

    OpenAIRE

    Flórez Ruiz, Alberto

    2015-01-01

    En las bases y principios del Esquema Nacional de Interoperabilidad se hacen una serie de manifestaciones que quieren confirmar cómo este Real Decreto tiene presentes las recomendaciones de la Unión Europea recogidas en el Marco Europeo de Interoperabilidad. También se tienen en cuenta otros instrumentos y actuaciones relativas a la interoperabilidad de las Administraciones Públicas Europeas. Dichas recomendaciones se adaptan conforme a la situación tecnológica de las diferentes Administracio...

  14. Interacción universidad y entorno: marco para el emprendimiento

    OpenAIRE

    Pedro Emilio Sanabria-Rangel; María Eugenia Morales-Rubiano; Carolina Ortiz-Riaga

    2015-01-01

    El documento desarrolla el tema de la relación universidad-entorno, especialmente en lo que se refiere a la vinculación con el sector productivo como parte del desarrollo de la función de extensión universitaria. El propósito fundamental es proporcionar un marco de referencia para la creación o justificación de las unidades de emprendimiento universitarias como mecanismo de enlace para el desarrollo de la función extensión desde una de sus aproximaciones: el enfoque empresarial. Como resultad...

  15. Orden económico-social como marco de la transnacionalidad empresarial

    OpenAIRE

    García Echevarría, Santiago

    2006-01-01

    La relación entre el orden económico-social de cada país, no solo en su dimensión normativa sino también en lo que afecta a su cultura económica y social y la fuerza de la necesaria transnacionalidad de la empresa ha constituido durante década la clave del desarrollo de los pueblos. Los procesos de cambio empresarial, que se suceden en el marco de cada país, buscan en la transnacionalidad su futuro y su desarrollo. Antes y ahora la apertura es, sin duda, la referencia empresarial. La inter...

  16. Marco epistemológico de la enfermería

    OpenAIRE

    María Mercedes Durán de Villalobos

    2002-01-01

    El marco epistemológico de la enfermería pretende mostrar, de manera panorámica, la evolución del conocimiento de la enfermería. En primera instancia, se parte de una clarificación del significado de disciplina profesional y de los componentes de la disciplina: perspectiva, dominio, definiciones y conceptos y patrones del conocimiento. A partir de la definición de la disciplina de la enfermería como el estudio del cuidado de la experiencia o vivencia de la salud humana, s...

  17. Introducción a la accesibilidad web (Universidad Nacional Mayor de San Marcos)

    OpenAIRE

    Luján Mora, Sergio

    2011-01-01

    Materiales del curso "Introducción a la accesibilidad web" impartido en la Facultad de Ingeniería de Sistemas e Informática de la Universidad Nacional Mayor de San Marcos (Lima, Perú) en agosto de 2011. Introducción a la accesibilidad web: ¿Qué es la accesibilidad web?; ¿Accesibilidad = usabilidad?; Ayudas técnicas para los discapacitados; ¿Cómo hago que mi sitio web sea accesible?; Legislación en España; Más información. Universidad de Alicante (España) y Universidad Nacional Mayor de San...

  18. Una propuesta de marco de trabajo orientado al dominio del procesamiento transaccional

    OpenAIRE

    Zbucki, Hernán Enrique; Pons, Claudia

    2015-01-01

    La ingeniería de software establece que la construcción de programas debe ser encarado de la misma forma que los ingenieros construyen otros sistemas complejos. Los sistemas de procesamiento transaccional no son la excepción. Para lidiar con algunos de los desafíos de construir estas soluciones, se desarrolló una propuesta de marco de trabajo, que propone la construcción de una base de conceptos comunes, obtenidos del análisis de soluciones preexistentes, y de experiencias del equipo que desa...

  19. Marco legal en la protección ambiental de los bosques nativos

    OpenAIRE

    Pohl Schnake, Verónica; Vallejos, Víctor Hugo

    2009-01-01

    Con este trabajo se pretende contribuir al debate en torno a los bosques nativos de nuestro país en el marco de la reciente ley 26.331/07 de "Presupuestos mínimos de protección ambiental de los bosques nativos" y su aún más reciente reglamentación. Se realiza en primer término una breve referencia al encuadre de la legislación ambiental en nuestro país, luego se presentan algunos resultados del Primer Inventario Forestal del año 2001. En una segunda instancia se analizan los principales aspec...

  20. Los entornos personales de aprendizaje en el marco de la educación permanente

    OpenAIRE

    Navas, Elvira

    2013-01-01

    En este trabajo se presenta un estudio documental sobre el surgimiento, evolución y estado actual de la utilización y desarrollo de los Entornos Personales de Aprendizaje (Personal Learning Environment, PLE) en el marco de la Educación Permanente o Aprendizaje para Toda la vida (Lifelong Learning). En primer lugar, se hace una revisión del concepto de Educación Permanente desde la literatura de inicios de siglo XX. A continuación, se procede a estudiar el término PLE, desde sus orígenes hasta...

  1. Habitabilidad educativa de las escuelas. Marco de referencia para el diseño de indicadores

    OpenAIRE

    Juan Manuel Hernández Vázquez

    2010-01-01

    Este documento propone el concepto de habitabilidad educativa de la escuela (HEE) para contribuir a subsanar la falta de un marco conceptual que apoye la reflexión y el desarrollo de indicadores sobre las condiciones en que operan los servicios educativos en países con extensa pobreza como el nuestro. Comprende la revisión de ocho dimensiones cuya pertinencia se argumenta con base en la revisión de bibliografía internacional sobre las temáticas involucradas. Las ocho dimensiones planteadas in...

  2. Aprendizaje significativo en el marco del origen de la célula eucariota

    OpenAIRE

    Narváez Palacios, Janeth Patricia

    2012-01-01

    Las ideas desarrolladas por David Ausubel en su teoría de aprendizaje significativo (caracterizado por la interacción entre el nuevo conocimiento y el conocimiento previo) y Marco Antonio Moreira en su propuesta aprendizaje significativo critico (a través del cual el estudiante podrá formar parte de su cultura y, al mismo tiempo, no ser subyugado por ella, por sus ritos, sus mitos y sus ideologías), son aplicadas en el presente trabajo para orientar la enseñanza de la estructura celular, con ...

  3. ASPECTOS ECONÓMICO-INSTITUCIONALES DEL MARCO REGULATORIO MEXICANO DEL SISTEMA NACIONAL DE INNOVACIÓN

    OpenAIRE

    Martín Puchet Anyul; Pablo Ruiz Nápoles

    2008-01-01

    El marco regulatorio de un sistema de innovación está compuesto por reglas de distinto origen. Dichas reglas hacen posible y condicionan el funcionamiento del sistema. A su vez ellas generan incentivos o restricciones para las acciones de los agentes que integran el sistema. Este artículo se concentra en las reglas surgidas de la legislación mexicana de ciencia y tecnología que cambió entre 1999 y 2003 en concordancia con las reformas económicas. Se caracteriza y describe esa parte del ma...

  4. Governança na internet: um estudo sobre o Marco Civil brasileiro

    OpenAIRE

    Laura Vilela Rodrigues Rezende; Meyrielle Rodrigues de Lima

    2016-01-01

    El trabajo tiene como propósito realizar un estudio sobre la legislación que rige el uso de Internet en Brasil, en el Marco Civil de Internet (Ley 12.965/2014). Se trata de una investigación descriptiva, de naturaleza cua litativa, basada en recopilación bibliográfica y estudio comparativo. Se ex pone inicialmente un breve histórico de Internet en Brasil y su panorama actual. Luego, se presenta el concepto de gobernanza en Internet y los su cesos que marcaron ...

  5. Dynamic secondary ion mass spectrometry and X-ray photoelectron spectroscopy on artistic bronze and copper artificial patinas

    International Nuclear Information System (INIS)

    To prevent the natural processes of decay and to develop and improve the treatments of conservation and restoration of artistic bronzes meaning statues and sculptures, it is important understanding the patination processes and the knowledge of artificially corroded surfaces. Chemical and physical characterization of artificial patinas obtained on artistic bronzes and coppers by using the 19th century Western traditional patination techniques and recipes by means of SEM-EDS, light microscopy and ATR/FT-IR has been done in previous studies [I.Z. Balta, L. Robbiola, Characterization of artificial black patinas on artistic cast bronze and pure copper by using SEM-EDS and light microscopy, in: Proceedings of the 13th European Microscopy Congress, 22-27 August 2004, Antwerp, Belgium, EMC 2004 CD-Rom Conference Preprints; I.Z. Balta, L. Robbiola, Traditional artificial artistic bronze and copper patinas-an investigation by SEM-EDS and ATR/FT-IR, in: Proceedings of the 8th International Conference on Non Destructive Investigations and Microanalysis for the Diagnostics and Conservation of the Cultural and Environmental Heritage, 15-19 May 2005, Lecce, Italy, ART'05 CD-Rom Conference Preprints]. Differences in morphology (structure, thickness, porosity, adherence, compactity, uniformity, homogeneity) and also in composition, on both artistic cast bronze and pure copper patinas, were clearly evidenced. Further in-depth investigation is required to be carried out in order to better understand the patinas mechanisms of formation and the layers kinetics of growth. The elemental and chemical analysis, either on a surface monolayer or in a depth profile, by using the Secondary Ion Mass Spectrometry (SIMS) and X-ray Photoelectron Spectroscopy (XPS) techniques, can provide this kind of information, unique at trace-level sensitivity. SIMS has proved to be a suitable analytical technique for analyzing small amounts of material with high atomic sensitivity (ppm or even ppb) and high

  6. Dynamic secondary ion mass spectrometry and X-ray photoelectron spectroscopy on artistic bronze and copper artificial patinas

    Science.gov (United States)

    Balta, I. Z.; Pederzoli, S.; Iacob, E.; Bersani, M.

    2009-04-01

    To prevent the natural processes of decay and to develop and improve the treatments of conservation and restoration of artistic bronzes meaning statues and sculptures, it is important understanding the patination processes and the knowledge of artificially corroded surfaces. Chemical and physical characterization of artificial patinas obtained on artistic bronzes and coppers by using the 19th century Western traditional patination techniques and recipes by means of SEM-EDS, light microscopy and ATR/FT-IR has been done in previous studies [I.Z. Balta, L. Robbiola, Characterization of artificial black patinas on artistic cast bronze and pure copper by using SEM-EDS and light microscopy, in: Proceedings of the 13th European Microscopy Congress, 22-27 August 2004, Antwerp, Belgium, EMC 2004 CD-Rom Conference Preprints; I.Z. Balta, L. Robbiola, Traditional artificial artistic bronze and copper patinas—an investigation by SEM-EDS and ATR/FT-IR, in: Proceedings of the 8th International Conference on Non Destructive Investigations and Microanalysis for the Diagnostics and Conservation of the Cultural and Environmental Heritage, 15-19 May 2005, Lecce, Italy, ART'05 CD-Rom Conference Preprints]. Differences in morphology (structure, thickness, porosity, adherence, compactity, uniformity, homogeneity) and also in composition, on both artistic cast bronze and pure copper patinas, were clearly evidenced. Further in-depth investigation is required to be carried out in order to better understand the patinas mechanisms of formation and the layers kinetics of growth. The elemental and chemical analysis, either on a surface monolayer or in a depth profile, by using the Secondary Ion Mass Spectrometry (SIMS) and X-ray Photoelectron Spectroscopy (XPS) techniques, can provide this kind of information, unique at trace-level sensitivity. SIMS has proved to be a suitable analytical technique for analyzing small amounts of material with high atomic sensitivity (ppm or even ppb) and high

  7. Magnetization and Inter-Filament Contact in HEP and ITER Bronze-Route Nb(3)Sn Wires

    CERN Document Server

    Bordini, B; Devred, A; Richter, D; Bessette, D; Jewell, M; Bottura, L

    2011-01-01

    Magnetization measurements are relevant tests for the characterization of superconductors. Practically they are the only measurements that allow estimating the critical current density at low fields of low temperature superconductors, the effective filament size and the hysteresis losses. For this purpose CERN, in collaboration with the University of Geneva, has carried out magnetization measurements on five types of Nb(3)Sn wires: three bronze route strands used in the ITER project; one Powder In Tube (PIT) and one Internal Tin (IT) wires used for developing next generation accelerator magnets. The field dependent magnetization has been determined using three setups: a Vibrating Sample Magnetometer (VSM), a Superconducting Quantum Interference Device (SQUID) and a special system used for the production control of LHC strands. Samples of different lengths have been tested to check the different coupling between the filaments. Unexpectedly, it was found that the magnetization of the tested bronze wires was str...

  8. Magnetization and Inter-Filament Contact in HEP and ITER Bronze-Route Nb3Sn Wires

    CERN Document Server

    Bordini, B; Bottura, L; Devred, A; Jewell, M; Richter, D; Senatore, C

    2011-01-01

    Magnetization measurements are relevant tests for the characterization of superconductors. Practically they are the only measurements that allow estimating the critical current density at low fields of low temperature superconductors, the effective filament size and the hysteresis losses. For this purpose CERN, in collaboration with the University of Geneva, has carried out magnetization measurements on five types of Nb3Sn wires: three bronze route strands used in the ITER project; one Powder In Tube (PIT) and one Internal Tin (IT) wires used for developing next generation accelerator magnets. The field dependent magnetization has been determined using three set-ups: a Vibrating Sample Magnetometer (VSM), a Superconducting Quantum Interference Device (SQUID) and a special system used for the production control of LHC strands. Samples of different lengths have been tested to check the different coupling between the filaments. Unexpectedly, it was found that the magnetization of the tested bronze wires was stro...

  9. Marco Denevi en la década de los ochenta: Literatura y política Marco Denevi in the decade of eighties: Literature and politics

    Directory of Open Access Journals (Sweden)

    Nicolás Abadie

    2012-01-01

    Full Text Available Con la vuelta de la democracia en Argentina en 1983, comienzan a circular discursos de lo más diversos que tenían como objeto de análisis las causas sociales y políticas que motivaron el último golpe de Estado. Dentro de esta eclosión de objetos literarios, encontramos ficciones que indagan en el modelo de país que se aspiraría a construir y otras que anticipan el futuro de la nación a través de la lectura de los acontecimientos que sucedían en ese momento. Marco Denevi (1922-1998 en esta década incorpora a su particular modo de entender la literatura el rol determinante de la política. Después de haberse iniciado en el relato policial, creado minificciones, escrito piezas teatrales y novelas de gran mimetismo con la clase media argentina, en las obras publicadas en los 80 buscará encontrar las causas del fracaso de esa "anomalía histórica" que se dio en llamar Argentina, sobre todo en la predisposición sicológica y el carácter del porteño rioplatense.With the return of the democracy in Argentina in 1983 they begin to circulate several speeches that took as an object of analysis the social and political reasons that motivated the last military dictatorial government. Inside this great manifestation of literary objects, we find fictions that investigate the model of country who would aspire to construct and others that anticipate the future of the nation across the reading of the events that were happening in this moment. Marco Denevi (1922-1998 in this decade incorporates into his individual way of understanding the literature the determinant role of politics. After writing has begun in the police statement, created minifictions, theatrical pieces and novels of great mimetism with the Argentine middle class, in the works published in the 80 it will seek to find the reasons of the failure of this "historical anomaly" that was given in calling Argentina, especially in the psychological predisposition and the character of the

  10. Oxygen isotope in archaeological bioapatites from India: Implications to climate change and decline of Bronze Age Harappan civilization

    OpenAIRE

    Anindya Sarkar; Arati Deshpande Mukherjee; Bera, M. K.; Das, B.; Navin Juyal; Morthekai, P.; Deshpande, R. D.; Shinde, V. S.; L. S. Rao

    2016-01-01

    The antiquity and decline of the Bronze Age Harappan civilization in the Indus-Ghaggar-Hakra river valleys is an enigma in archaeology. Weakening of the monsoon after ~5 ka BP (and droughts throughout the Asia) is a strong contender for the Harappan collapse, although controversy exists about the synchroneity of climate change and collapse of civilization. One reason for this controversy is lack of a continuous record of cultural levels and palaeomonsoon change in close proximity. We report a...

  11. MEASURING AND MODELING OF THE MECHANICAL PROPERTIES OF COMPOSITE BEARING PAD MADE OF PLASTIC MATRIX AND FINE BRONZE ELASTIC SPRINGS

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    The viscoelastic properties of the normal PTFE plastic and strengthened PTFE plastic for bearing pad are measured. The mechanical properties of the composite material for bearing pad, which is made of the aforementioned plastics as matrix reinforced by fine bronze elastic springs, are modeled and relaxation modulus of the material are presented. The difference between these two kinds of PTFE is studied. The results show that the complex modulus of PTFE plastics for bearing pad is higher than that of normal PTFE plastics.

  12. The Metallurgy of the Sicilian Final Bronze Age/Early Iron Age necropolis of Madonna del Piano (Catania, Sicily)

    OpenAIRE

    Giumlia-Mair, Alessandra; Albanese Procelli, Rosa Maria; Lo Schiavo, Fulvia

    2010-01-01

    This paper presents the analysis results of the copper- based finds, from the important Sicilian necropolis of Madonna del Piano, near Grammichele (Catania), dated between the local Final Bronze Age 2 and the Early Iron Age IA. 122 copper-based finds from the 273 graves (1970-71) of the large cemetery have been analysed. The sampled objects belong to different classes, there are for instance weapons of offence and defence, such as swords and greaves, small decorative objects for personal use,...

  13. Combatentes do gueto, guerreiros da periferia

    Directory of Open Access Journals (Sweden)

    Mônica Rebecca Ferrari Nunes

    2013-01-01

    Full Text Available Combatente do gueto, guerreiro da periferia, militante da causa (... Combatente do gueto é o nome de uma rua atrás do Palácio do Governo (...” conta Jairo, taxista, a propósito de sua inspiração poética, durante as filmagens de Povo lindo, povo inteligente – O Sarau da Cooperifa, documentário dirigido por Sérgio Gagliardi e Maurício Falcão, produzido, em 2008, pela DGT Filmes. O filme narra a história e os bastidores do sarau que acontece na zona sul da cidade de São Paulo, em Campo Limpo, no bar do Zé Batidão. “A periferia não tem museu, não tem teatro nem cinema, o único espaço público que tem é o bar”, explica Sérgio Vaz, um dos idealizadores do movimento que contempla na produção poética, da periferia para a periferia, a força da contestação social. A cultura como arena para a luta entre os signos monossêmicos e a pluralidade sígnica proposta pelo artista que faz da palavra ruído incômodo. O sarau da Cooperifa, o sarau do Binho também já foram objetos de estudos acadêmicos, como a tese As redes de escritura nas periferias de São Paulo, de Marco Antônio Bin, defendida no Programa de Ciências Sociais da PUCSP, em maio de 2009

  14. A theoretical and experimental study on the pulsed laser dressing of bronze-bonded diamond grinding wheels

    Science.gov (United States)

    Deng, H.; Chen, G. Y.; Zhou, C.; Zhou, X. C.; He, J.; Zhang, Y.

    2014-09-01

    A series of theoretical analyses and experimental investigations were performed to examine a pulsed fiber-laser tangential profiling and radial sharpening technique for bronze-bonded diamond grinding wheels. The mechanisms for the pulsed laser tangential profiling and radial sharpening of grinding wheels were theoretically analyzed, and the four key processing parameters that determine the quality, accuracy, and efficiency of pulsed laser dressing, namely, the laser power density, laser spot overlap ratio, laser scanning track line overlap ratio, and number of laser scanning cycles, were proposed. Further, by utilizing cylindrical bronze wheels (without diamond grains) and bronze-bonded diamond grinding wheels as the experimental subjects, the effects of these four processing parameters on the removal efficiency and the surface smoothness of the bond material after pulsed laser ablation, as well as the effects on the contour accuracy of the grinding wheels, the protrusion height of the diamond grains, the sharpness of the grain cutting edges, and the graphitization degree of the diamond grains after pulsed laser dressing, were explored. The optimal values of the four key processing parameters were identified.

  15. Multipeak self-biased magnetoelectric coupling characteristics in four-phase Metglas/Terfenol-D/Be-bronze/PMN-PT structure

    Science.gov (United States)

    Huang, Dongyan; Lu, Caijiang; Bing, Han

    2015-04-01

    This letter develops a self-biased magnetoelectric (ME) structure Metglas/Terfenol-D/Be-bronze/PMN-PT (MTBP) consisting of a magnetization-graded Metglas/Terfenol-D layer, a elastic Be-bronze plate, and a piezoelectric 0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3 (PMN-PT) plate. By using the magnetization-graded Metglas/Terfenol-D layer and the elastic Be-bronze plate, multi-peak self-biased ME responses are obtained in MTBP structure. The experimental results show that the MTBP structure with two layers of Metglas foil has maximum zero-biased ME voltage coefficient (MEVC). As frequency increases from 0.5 to 90 kHz, eleven large peaks of MEVC with magnitudes of 0.75-33 V/(cm Oe) are observed at zero-biased magnetic field. The results demonstrate that the proposed multi-peak self-biased ME structure may be useful for multifunctional devices such as multi-frequency energy harvesters or low-frequency ac magnetic field sensors.

  16. Multipeak self-biased magnetoelectric coupling characteristics in four-phase Metglas/Terfenol-D/Be-bronze/PMN-PT structure

    Directory of Open Access Journals (Sweden)

    Dongyan Huang

    2015-04-01

    Full Text Available This letter develops a self-biased magnetoelectric (ME structure Metglas/Terfenol-D/Be-bronze/PMN-PT (MTBP consisting of a magnetization-graded Metglas/Terfenol-D layer, a elastic Be-bronze plate, and a piezoelectric 0.67Pb(Mg1/3Nb2/3O3-0.33PbTiO3 (PMN-PT plate. By using the magnetization-graded Metglas/Terfenol-D layer and the elastic Be-bronze plate, multi-peak self-biased ME responses are obtained in MTBP structure. The experimental results show that the MTBP structure with two layers of Metglas foil has maximum zero-biased ME voltage coefficient (MEVC. As frequency increases from 0.5 to 90 kHz, eleven large peaks of MEVC with magnitudes of 0.75-33 V/(cm Oe are observed at zero-biased magnetic field. The results demonstrate that the proposed multi-peak self-biased ME structure may be useful for multifunctional devices such as multi-frequency energy harvesters or low-frequency ac magnetic field sensors.

  17. Recent activity in development of bronze-processed Nb3Sn Wires. Improvements in strand performance and cabling

    International Nuclear Information System (INIS)

    Bronze-processed Nb3Sn wires have been used in practical applications of high-field magnets and large-scale magnets. Since the 1980s, Furukawa Electric Co., Ltd. has been developing and manufacturing many high-performance bronze-processed Nb3Sn wires. This paper describes our recent activity in development of the bronze-processed Nb3Sn wires. The non-Cu critical current density of the ITER-type strand was 1,150 A/mm2 at 12 T and 4.2 K, which is 1.8 times higher than that of the ITER-CS model coil 15 years ago. High-strength Nb3Sn wires reinforced with Cu-Ni/Nb-Ti or Cu-Nb composites have been successfully fabricated for high-field magnets. Enhancements of the superconducting properties resulting from pre-bending effects were demonstrated with Cu-Nb reinforced Nb3Sn wires. Mass production of practical cables for JT-60SA CS coils have been completed in exact accordance with the specifications. In addition, experimental manufacture of ITER-CSJA1 cables was properly carried out. Furthermore, a novel type of aluminum-alloy jacketed Nb3Sn conductor has been developed using the friction stir welding (FSW) technique. (author)

  18. Bronze Age pottery from the Aeolian Islands: definition of Temper Compositional Reference Units by an integrated mineralogical and microchemical approach

    Science.gov (United States)

    Brunelli, D.; Levi, S. T.; Fragnoli, P.; Renzulli, A.; Santi, P.; Paganelli, E.; Martinelli, M. C.

    2013-12-01

    An integrated microchemical-petrographic approach is here proposed to discriminate the provenance of archaeological pottery artefacts from distinct production centres. Our study focuses on a statistically significant sampling ( n=186) of volcanic temper-bearing potteries representative of the manufacturing and dispersion among the islands of the Aeolian Archipelago during the Bronze Age. The widespread establishment of new settlements and the abundant recovery of Aeolian-made ceramic in southern Italy attest for the increased vitality of the Archipelago during the Capo Graziano culture (Early Bronze Age-Middle Bronze Age 2; 2300-1430 BC). Potteries from three of the main known ancient communities (Lipari, Filicudi and Stromboli) have been studied integrating old collections and newly excavated material. Volcanic tempers have been first investigated through multivariate analyses of relative abundances of mineral and rock clasts along with petrographic characters. In addition, we performed in-situ mineral chemistry microanalyses by Electron Microprobe and Laser Ablation—Inductively Coupled Plasma Mass Spectrometry to assess major and trace element composition of the most common mineral phases. Four Temper Compositional Reference Units have been recognised based on compositional trends. Two units (AI and AX) are unequivocally distinct by their peculiar trace element enrichment and petrographic composition; they mostly contain samples from the sites of Lipari and Stromboli, respectively. Units AIV and AVIII, restricted to the sites of Filicudi and Stromboli, show distinct petrographic characters but overlapped geochemical fingerprints.

  19. Isotopic Evidence For The Primary Production, Provenance And Trade Of Late Bronze Age Glass In The Mediterranean.

    Science.gov (United States)

    Henderson, J.; Evans, J.; Nikita, K.

    The earliest known man made glass comes from Mesopotamia and dates to the 23rd century BC. By the 16th century BC the first glass vessels appear in Mesopotamia, but the earliest evidence for the fusion of glass from raw materials has been found at the 13th century BC Egyptian site of Qantir. Chemical analyses of this elite Late Bronze Age material have produced compositional distinctions between glasses found in Mesopotamia and Egypt. It is however debatable whether trace element concentrations provide a (geological) provenance for the glasses. By using neodymium and strontium isotopes to fingerprint well-dated chemically analysed 15th to 11th century BC glass samples, we show that independent primary production probably occurred in both Egypt and Mesopotamia in the 14th century BC, and that both of these areas exported glass to Greece. We also discuss the technological implications for glass manufacture and colouring that these new data provide. The results add significant new scientific evidence for glass trade between Late Bronze Age palatial societies. Moreover, it is the first time that this methodology has been used to investigate Bronze Age glass.

  20. Calibration of the San Marco airglow-solar spectrometer instrument in the extreme ultraviolet

    Science.gov (United States)

    Worden, John; Woods, Thomas N.; Rottman, Gary J.; Schmidtke, Gerhard; Tai, Hongsheng; Doll, Harry G.; Solomon, Stanley C.

    1996-02-01

    The San Marco 5 carried the airglow-solar spectrometer instrument (ASSI). This 18-channel spectrometer measured the solar and terrestrial radiation in the wavelength region between 20 and 700 nm for 9 months in 1988. The ASSI extreme ultraviolet (EUV) channels showed significant sensitivity changes during the mission. The sensitivity changes of the EUV channels are quantified by comparing ASSI solar EUV irradiance measurements to the solar EUV irradiance derived from a solar proxy model. A sensitivity change model is developed that shows that exponential curves can adequately describe the sensitivity changes of the ASSI optics and detectors. The November 10 calibration parameters and the sensitivity change model can be used to derive the EUV terrestrial airglow brightness for the time period of the ASSI mission. Analysis of the solar Lyman-(alpha) irradiance measured by the ASSI, the solar mesospheric explorer (SME), and the upper atmosphere research satellite has led to a revised Lyman-(alpha) irradiance for the San Marco mission. For example, the ASSI November 10, 1988, Lyman-(alpha) measurement is 5.3 X 1011 photons cm-2 s-1 versus the reported SME measurement of 3.35 X 1011 photons cm-2 s-1.

  1. Solar measurements from the Airglow-Solar Spectrometer Instrument (ASSI) on the San Marco 5 satellite

    Science.gov (United States)

    Woods, Thomas N.

    1994-04-01

    The analysis of the solar spectral irradiance from the Airglow-Solar Spectrometer Instrument (ASSI) on the San Marco 5 satellite is the focus for this research grant. A pre-print copy of the paper describing the calibrations of and results from the San Marco ASSI is attached to this report. The calibration of the ASSI included (1) transfer of photometric calibration from a rocket experiment and the Solar Mesosphere Explorer (SME), (2) use of the on-board radioactive calibration sources, (3) validation of the ASSI sensitivity over its field of view, and (4) determining the degradation of the spectrometers. We have determined that the absolute values for the solar irradiance needs adjustment in the current proxy models of the solar UV irradiance, and the amount of solar variability from the proxy models are in reasonable agreement with the ASSI measurements. This research grant also has supported the development of a new solar EUV irradiance proxy model. We expected that the magnetic flux is responsible for most of the heating, via Alfen waves, in the chromosphere, transition region, and corona. From examining time series of solar irradiance data and magnetic fields at different levels, we did indeed find that the chromospheric emissions correlate best with the large magnetic field levels.

  2. FIRST REPORT OF SITTING ANOMOEPUS TRACKS IN EUROPEAN LOWER JURASSIC (LAVINI DI MARCO SITE - NORTHERN ITALY

    Directory of Open Access Journals (Sweden)

    MARCO AVANZINI

    2001-03-01

    Full Text Available The palaeontologic site at Lavini di Marco, near to Rovereto (Trento, reveals a wide fossil tidal flat of Early Jurassic age (Calcari Grigi Formations – lower Member; Hettangian to lower Sinemurian . An extensive set of dinosaur prints were discovered a few years ago and are now the subject of ichnological and paleobiological studies. The prints which are described in present short note are believed to represent the right and left foot of the same individual, set in a side-by-side, sub-parallel, sitting posture. The prints can be classified as Anomoepus Hitchcock 1848. Amongst recognised ichnospecies, most of the charachteristics of the prints here described point to Moyenisauropus dodai Ellenberger 1974 (recte Anomoepus dodai Olsen & Galton 1984 of Lesotho. By contrast, the prints found at Lavini di Marco differ from the Anomoepus found in central-east Europe. These characters would seem to confirm the Gondwanic origins of the Rovereto ichnofauna as previously supposed from the study of other taxa. 

  3. MODELOS DE LIDERAZGO POSITIVO: MARCO TEÓRICO Y LÍNEAS DE INVESTIGACIÓN

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    Javier Blanch, Francisco Gil

    2016-09-01

    Full Text Available El objetivo de este artículo es doble, en primer lugar, se define el marco teórico del liderazgo positivo así como las razones de su aparición. Este surge vinculado al paradigma de la psicología organizacional positiva, en cuyo ámbito, se han desarrollado las diferentes formas de liderazgo que lo integran (i.e. transformacional, de servicio, espiritual, auténtico y positivo. Aunque el constructo no parece unívocamente delimitado, los diferentes tipos que se incluyen bajo esta denominaciónpresentan una gran afinidad y elementos comunes. En segundo lugar, se revisan aspectos prácticos vinculados a la investigación empírica que constatan el impacto de este tipo de liderazgo en las organizaciones y se subraya la relación entre estas formas de liderazgo y variables organizacionales positivas. Finalmente, se analizan futuras líneas de investigación para el desarrollo de este marco conceptual.

  4. Reflexiones sobre el marco conceptual de la contabilidad financiera: El caso de Colombia

    Directory of Open Access Journals (Sweden)

    Ernesto María Sierra González

    2004-01-01

    Full Text Available Con el auge del proceso de normalización contable ha surgido una creciente preocupación académica y profesional por el establecimiento de un conjunto coherente de conceptos que sustenten el debido proceso en la emisión de normas de contabilidad y auditoría. Desde finales de los años sesenta, los organismos internacionales emisores de normas han buscado construir un marco conceptual para la contabilidad financiera, elaborado con base en la observación de la práctica contable y las metodologías de investigación propias de la filosofía de las ciencias. En Colombia, el proceso de normalización empezó hacia 1986 con la expedición del Decreto 2160. Esta medida revela la necesidad de construir políticas de estandarización de las prácticas contables y de generar un debate sobre la temática del marco conceptual en el contexto de la jurisdicción local y del desarrollo de la profesión y la disciplina contable, como herramienta fundamental del crecimiento económico y el bienestar social.

  5. LA RECOGIDA DE BASURA EN MEGA-CIUDADES: En el marco de la sostenibilidad

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    Fabian Tron

    2010-01-01

    Full Text Available La comprensión de las sociedades urbanas complejas sólo es posible cuando se estudia tanto el sector formal como el informal que las conforma. Para explicar ambos modelos, el rubro de los Residuos surge como una de las herramientas más competentes, capaz de distinguir entre ellos, incluso cuando la demanda de la sociedad supera su marco legislativo. Un cambio de enfoque en el que se defi ne a los residuos sólidos en función a su potencial como recurso, contextualiza realidades muy divergentes. Con esta acepción, la gestión de residuos dentro de las ciudades de Tokio, México, Madrid y Paris puede ser estudiada a profundidad, denotando sus principales diferencias operativas y principales vulnerabilidades. En este artículo se demuestra cómo, una vez evidenciadas las particularidades, es posible relacionar la interacción de las ciudades frente a los vacíos del marco normativo. Una comparación que destaca la capacidad innata de las sociedades a adaptarse a dichas imperfecciones, llegando a una mejor comprensión de los alcances del sector informal que, particularmente dentro de los países en desarrollo, contribuye a la efi ciencia del sistema urbano.

  6. Governança na internet: um estudo sobre o Marco Civil brasileiro

    Directory of Open Access Journals (Sweden)

    Laura Vilela Rodrigues Rezende

    2016-01-01

    Full Text Available El trabajo tiene como propósito realizar un estudio sobre la legislación que rige el uso de Internet en Brasil, en el Marco Civil de Internet (Ley 12.965/2014. Se trata de una investigación descriptiva, de naturaleza cua litativa, basada en recopilación bibliográfica y estudio comparativo. Se ex pone inicialmente un breve histórico de Internet en Brasil y su panorama actual. Luego, se presenta el concepto de gobernanza en Internet y los su cesos que marcaron las discusiones acerca de esta temática. Se aborda el Marco Civil de Internet en Brasil, el histórico de su creación y los principios que lo rigen. Se concluye que es un importante instrumento oficial regla mentario para asegurar la libertad y los derechos del usuario. Su concep ción se fundamentó en la participación de la sociedad civil, lo que puede considerarse inédito en lo que se refiere a la creación de leyes reglamenta rias. Se considera que esta sea una ley sofisticada en cuanto a sus directri ces, lo que la vuelve una de las más progresistas del mundo. Pese a todo lo anterior, su trayectoria democrática de creación le otorga un carácter ge neralista y superficial.

  7. Bronze Age metal artefacts found on Cyprus - metal from Anatolia and the Western Mediterranean

    Directory of Open Access Journals (Sweden)

    Stos-Gale, Zofia A.

    2010-12-01

    Full Text Available Hundreds of Bronze Age metal artefacts excavated on archaeological sites in Cyprus have been analysed for their lead isotope and elemental composition in the Isotrace Laboratory, University of Oxford, in the years 1982-2002. In parallel, but in particular after 1995, hundreds of samples of minerals and slags collected from the mines and smelting sites around the Troodos Mountains were also analysed. Most of the results were published in various articles over the years, but the interpretation of some of the lead isotope data needs a current revision in view of new research conducted in Spain, Sardinia and southern France. It has been known that the lead isotope data for metal artefacts from the Cypriot Bronze Age sites shows that not all of the copper is consistent with origin from the Cypriot ores. In addition, the lead and silver artefacts found there must have been imported, because there are no lead or silver ores on Cyprus. The re-evaluation of the data shows that about 11 % of the analysed metal artefacts are consistent with the origin from the deposits in the Aegean and Turkey, while about 14 % with sources in the Western Mediterranean. This paper discusses in detail the current interpretation of the research into the sources of imported metal found in the Bronze Age context on Cyprus.

    Cientos de objetos de metal de la Edad del Bronce excavados en yacimientos de Chipre han sido analizados para conocer su composición elemental y sus isótopos de plomo en el Isotrace Laboratory de la Universidad de Oxford entre los años 1982 y 2002. Especialmente con posterioridad a 1995 cientos de muestras de minerales y escorias recogidas de minas y sitios de reducción de minerales localizadas en el entorno de las montañas de Troodos también fueron analizadas. La mayoría de los resultados fueron publicados en varios artículos a lo largo del tiempo, pero la interpretación de algunos análisis de isótopos de plomo necesitan de una revisión a

  8. The Bronze Age in the Northwestern of Iberian Peninsula: an analysis from funerary practices

    Directory of Open Access Journals (Sweden)

    Bettencourt, Ana M. S.

    2010-06-01

    Full Text Available From the analysis of the funerary practices and of their integration in the different chronological-cultural contexts where they develop, the author works out a new interpretation of the mechanism of negotiation of power and the promotion of social identity through the Bronze Age of the NW Iberian Peninsula. When studying an area so wide she distinguishes two great trends in the type and distribution of the funerary architectures throughout the Bronze Age that she associates with different ways of interaction with, and perception of, the world. Thus, she argues that the necropolises of “cloudy” tombs (cists without tumuli, plain graves and pits, located in areas of great agricultural potential and close to the settlements, may have been constructed by sedentary communities, very involved in agricultural activities, with a great sense of territoriality and a great control over, and deep knowledge of, the territory. On the other hand the communities involved with mountain landscapes, eventually more related to cattle and with ways of life that would imply greater mobility, were responsible for the construction of more visible funerary structures, such as small tumuli of megalithic tradition, located away from the settlements. In relation to the social role of the corpse, the author argues for the Early Bronze Age, that, the occupation of new territories, the emergence of a new form of community interaction with the environment and the emergence of new mechanisms of power and legitimacy of the territory were materialized in burial practices and in the social role of some corpses, in copper and gold grave goods. This social role was represented in old and new places. From the Middle Bronze Age she assumes that the corpse loses importance in collective terms and that death becomes more familiar. The new settings of power negotiation and social identity are transferred to other contexts of action more connected with the sphere of the living

  9. A dialética do conflito num mundo fechado. Sentido e limites da teoria política de Carl Schmitt

    OpenAIRE

    Vasques, Rafael Franco

    2015-01-01

    O pensamento e a obra de Carl Schmitt, contínua a constituir um marco importante para vários pensadores contemporâneos. A sua oposição ao retorno da doutrina da guerra justa no ordenamento jurídico internacional, levou-o a tecer severas críticas ao imperialismo americano após o final da I Guerra Mundial. A queda do jus publicum europaeum, no entender, Schmitt, fez antever o aparecimento de uma guerra global, em nome da humanidade e da justiça, incapaz de distinguir militares...

  10. A family of rare earth molybdenum bronzes: Oxides consisting of periodic arrays of interacting magnetic units

    International Nuclear Information System (INIS)

    The family of rare earth molybdenum bronzes, reduced ternary molybdates of composition LnMo16O44, was synthesized and a detailed structural study carried out. Bond valence sum (BVS) calculations clearly show that the molybdenum ions in tetrahedral coordination are hexavalent while the electron count in the primitive unit cell is odd. Yet, measurements show that the phases are semiconductors. The temperature dependence of the magnetic susceptibility of samples containing several different rare earth elements was measured. These measurements verified the presence of a 6.5 K magnetic phase transition not arising from the rare earth constituent, but likely associated with the unique isolated ReO3-type Mo8O36 structural subunits in this phase. To better understand the behavior of these materials, electronic structure calculations were performed within density functional theory. Results suggest a magnetic state in which these structural moieties have an internal ferromagnetic arrangement, with small ~1/8 μB moments on each Mo. We suggest that the Mo8O36 units behave like pseudoatoms with spin 1/2 derived from a single hole distributed over the eight Mo atoms that are strongly hybridized with the O atoms of the subunit. Interestingly, while the compound is antiferromagnetic, our calculations suggest that a field-stabilized ferromagnetic state, if achievable, will be a narrow band half-metal. - Graphical abstract: LnMo16O44 phases comprise corner sharing tetrahedral and octahedral molybdenum ions. The MoO6 octahedra form Mo8O36 units that are well separated and act like pseudo-atoms, accommodating 11 electrons each. - Highlights: • Single crystal X-ray diffraction refinements of LnMo16O44 single crystals for Ln=Ce, Pr, Nd, Tb, Dy and Ho. • DFT calculations based on LaMo16O44. • [Mo8O36] units behaving as superatoms with a net magnetic moment of 1 µB. • Bronze structure containing equal number of molybdenum tetrahedra and octahedral

  11. Alloy characterization of a 7th Century BC archeological bronze vase — Overcoming patina constraints using Monte Carlo simulations

    Energy Technology Data Exchange (ETDEWEB)

    Manso, M. [Laboratório de Instrumentação, Engenharia Biomédica e Fisica da Radiação (LIBPhys-UNL), Departamento de Fisica, Faculdade de Ciências e Tecnologias, Universidade Nova de Lisboa, 2829-516 Monte da Caparica (Portugal); Faculdade de Belas-Artes da Universidade de Lisboa, Largo da Academia Nacional de Belas-Artes, 1249-058 Lisboa (Portugal); Schiavon, N. [Hercules Laboratory, University of Évora, Palácio do Vimioso,Largo Marquês de Marialva 8, 7000-809 Évora Portugal (Portugal); Queralt, I. [Laboratory of X-ray Analytical Applications, Institute of Earth Sciences Jaume Almera, CSIC, Solé Sabaris s/n, 08028 Barcelona (Spain); Arruda, A.M. [Centro de Arqueologia da Universidade de Lisboa (UNIARQ), Alameda da Universidade, 1600-214 Lisboa (Portugal); Sampaio, J.M. [BioISI — Biosystems & Integrative Sciences Institute, Faculdade de Ciências da Universidade de Lisboa (Portugal); Brunetti, A., E-mail: brunetti@uniss.it [Department of Political Science and Communication, University of Sassari, Via Piandanna 2, 07100 Sassari (Italy)

    2015-05-01

    In this work we evaluate the composition of a bronze alloy using X-ray fluorescence spectrometry (XRF) and Monte Carlo (MC) simulations. For this purpose, a 7th Century BC archeological vase from the SW Iberian Peninsula, displaying a well formed corrosion patina was analyzed by means of a portable X-ray fluorescence spectrometer. Realistic MC simulations of the experimental setup were performed with the XRMC code package which is based on an intensive use of variance-reduction techniques and uses XRAYLIB a constantly updated X-ray library of atomic data. A single layer model was applied for simulating XRF of polished/pristine bronze whereas a two-or-three-layer model was developed for bronze covered respectively by a corrosion patina alone or coupled with a superficial soil derived crust. These simulations took into account corrosion (cerussite (PbCO{sub 3}), cuprite (Cu{sub 2}O), malachite (Cu{sub 2}CO{sub 3}(OH){sub 2}), litharge (PbO)) and soil derived products (goethite (FeO(OH)) and quartz (SiO{sub 2})) identified by means of X-ray diffraction and Raman micro analytical techniques. Results confirm previous research indicating that the XRF/Monte Carlo protocol is well suited when a two-layered model is considered, whereas in areas where the patina + soil derived products' crust is too thick, X-rays from the alloy substrate are not able to exit the sample. Quantitative results based on MC simulations indicate that the vase is made of a lead–bronze alloy: Mn (0.2%), Fe (1.0%), Cu (81.8%), As (0.5%), Ag (0.6%), Sn (8.0%) and Pb (8.0%). - Highlights: • We study an archeological bronze vase with patina corrosion using XRF spectrometry. • The experimental setup is modeled using Monte Carlo (MC) simulations. • Combining MC simulations with XRF it is possible to derive concentrations. • We demonstrated that this is possible without removing the patina.

  12. Arranjo produtivo local e desenvolvimento sustentável: uma relação sinérgica no município de marco (CE.

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    Rafaella Alves Medeiros Alvarenga

    2013-10-01

    Full Text Available Com a evolução do próprio conceito de desenvolvimento, mediante o fortalecimento do paradigma da sustentabilidade, torna-se necessária uma evolução das discussões em torno dos arranjos produtivos locais (APLs que incorpore ponderações acerca de tais dimensões. Dessa forma, este estudo tem como objetivo geral analisar a ocorrência de práticas de desenvolvimento sustentável, com base no modelo triple bottom line, em um arranjo produtivo local. Para tanto, escolheu-se como campo empírico de estudo um APL de móveis localizado no município de Marco, no Estado do Ceará. Sua escolha para este trabalho se deveu tanto às características desse tipo de atividade, que, por depender da extração e utilização de recursos naturais, principalmente a madeira, apresenta grande relação com questões da dimensão ambiental da sustentabilidade, quanto ao reconhecimento do forte desempenho econômico do APL de Marco, que fez com que a cidade fosse reconhecida como um dos maiores polos moveleiros do Norte e Nordeste do país. Procurou-se identificar demonstrações econômicas (profit, sociais (people e ambientais (planet, bem como verificar a ocorrência de sinergia na relação arranjo produtivo e desenvolvimento sustentável. Na revisão da literatura, foram construídos tópicos sobre a abordagem teórica de arranjos produtivos locais, o papel do empresário político ou empresário coletivo, o desenvolvimento sustentável e o modelo triple bottom line. A metodologia fundamentou-se em abordagem qualitativa, cujas técnicas de coleta foram a entrevista semiestruturada, a observação e um corpus documental. Foram escolhidos intencionalmente e por acessibilidade seis empreendedores. Pode-se concluir que, com base no modelo triple bottom line, estão presentes algumas características de desenvolvimento sustentável, principalmente relacionadas às dimensões ambiental (planet e econômica (profit. A dimensão social (people ainda precisa ser

  13. La obligatoriedad del Departamento de Gestión Ambiental Empresarial y su marco normativo en Colombia

    Directory of Open Access Journals (Sweden)

    Ana Herrera Flórez

    2010-07-01

    Full Text Available ResumenLa Incidencia en la degradación del medio ambiente ha traído consigo que las empresas e industrias comiencen a concientizarse en el contexto de una nueva ética empresarial. Desde hace algunos años se ha hablado del concepto de Responsabilidad Social empresarial, no obstante, este proceso se veía muy alejado dentro del marco de lo ambiental, es por ello que desde la convención de Estocolmo se da vida a una serie de reglamentaciones internas en nuestro país que hace que las empresas comiencen a retomar su posición en la responsabilidad que les atañe; para referirse al proceso mediante elcual dichas empresas deciden voluntariamente contribuir al logro de una sociedad mejor y de un medio ambiente más limpio. Junto a esta línea de actuación, han surgido otros instrumentos que, asimismo, deben integrarse en esta nueva ética empresarial. El presente ensayo describe el estado en cuestión en nuestro Estado colombiano en cuanto a la obligatoriedad de mantener una oficina de Gestión Ambiental Empresarial Palabras claveResponsabilidad social, gestión empresarial, desarrollo sostenible, político del medio ambiente, normatividad.AbstractThe impact on environmental degradation has resulted in companies and industries begin to become aware in the context of a new business ethics. Now a days there has been explain the concept of business social responsibility, however, this process was very far within the framework of environmental, that is why from the Stockholm convention start a series of internal regulations in our country where companies begin to resume his position of responsibility as they are concerned, to refer to the process by which these companies decide voluntarily to contribute to a better society and a cleaner environment. Along this way of action, other instruments have emerged also be integrated into this new business ethics. This article describes the situation in our Colombian State regarding to

  14. MARCO LEGAL DEL CONTRATO DE ADHESIÓN EN EL COMERCIO ELECTRÓNICO Y LA TELEMÁTICA

    OpenAIRE

    José Arellano

    2004-01-01

    El objetivo de este trabajo se centró en analizar el marco legal del contrato de adhesión en el comercio electrónico. El tipo de investigación fue descriptiva, documental y cualitativa, con diseño no experimental documental bibliográfico. La técnica de recolección de datos fue una guía de observación, la cual permitió recabar la data pertinente al estudio, analizada en forma cualitativa. Los resultados indicaron que al analizar el marco jurídico de las partes (consentimiento, objeto y causa) ...

  15. Implicaciones del marco teórico de lo imaginario en la Psicología Social

    OpenAIRE

    Teresa Aracena Vicente

    2015-01-01

    En el presente estudio abordaremos dos de las principales concepciones sobre los mecanismos implicados en la construcción significativa del mundo. Hablamos de la Teoría de las Representaciones Sociales (TRS), formulada desde la psicología, y del marco teórico de lo imaginario, formulado principalmente desde la antropología y la filosofía. Procederemos exponiendo, primero, la TRS y, posteriormente, los acercamientos al marco teórico de lo imaginario desde diferentes disciplinas, para señalar l...

  16. Holes in teeth - Dental caries in Neolithic and Early Bronze Age populations in Central Germany.

    Science.gov (United States)

    Nicklisch, Nicole; Ganslmeier, Robert; Siebert, Angelina; Friederich, Susanne; Meller, Harald; Alt, Kurt W

    2016-01-01

    This study provides diachronic insight into the epidemiology of carious defects in teeth of Neolithic and Early Bronze Age populations in Central Germany over a period of 4000 years. The data were retrieved from skeletal remains uncovered at 21 sites throughout the Middle Elbe-Saale region (MES), comprising a total of 494 individuals with preserved teeth. The data generated were examined for age- and sex-related differences in order to gain information about the dietary habits and socio-economic structures of the period with the goal of identifying potential diachronic changes. The results indicated that dietary habits changed over the course of the Neolithic period: the prevalence of caries significantly decreased between the Early and Late Neolithic. The adults from the Early Neolithic sample, particularly those from the LBK bore the highest rate of caries. This highlights the essential importance of cereals in the diet of the early farmers in the Middle Elbe-Saale region. As time went on, meat and dairy products became more and more important, which had a positive impact on dental health. The data also show sex-specific differences: women were more often affected by caries than men and female jaws also generally exhibited greater numbers of carious teeth than their male counterparts. Dental health is a reflection of both biological factors and of economic and sociocultural structures. PMID:25765291

  17. Astronomical Interpretation of the Signs on the Vessel of the Bronze Age (Central Donbass)

    CERN Document Server

    Vodolazhskaya, Larisa N; Nevsky, Mikhail Yu

    2015-01-01

    The article presents the results of multidisciplinary study carried out with the help of archaeological and astronomical methods. The aim of the study was to analyze and interpret the signs - elements of the composition, incised on the outer side surface of the vessel of the Late Bronze Age, owned to Srubna culture and discovered near the Staropetrovsky village in the northeast of the Donetsk region. The measurements and astronomical calculations revealed that all signs have astronomical meaning. Fourray star has been interpreted as the star Sirius. The sign polyline has been interpreted as an analog of graphic of equation of time in which the testimony of a water clock correspond with average solar time, and the testimony of a sundial - the true solar time. Sign wheel has been interpreted as a complex of lines, reflecting the regularity changing the direction of the shadows from the gnomon at sunset at the equinoxes and solstices. The sign thin polyline has been interpreted as a symbol of change of height of...

  18. Effect of Annealing Atmosphere on the Mechanical Property of Free-cutting Phosphor Bronze Alloy

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    The present work is focused on the influence of annealing atmosphere on the microstructure and mechanical property of free-cutting phosphor bronze alloy. The annealing of the alloy was conducted in the three kinds of annealing atmosphere such as air, vacuum and nitrogen. After annealing, a discernable difference in recystallized grain size and lead particle size was not appeared with different annealing atmosphere. The tensile strength of the alloy annealed in air or nitrogen atmosphere was higher than that of those annealed in vacuum atmosphere. In thecase of the alloy annealed in vacuum atmosphere, the mechanical strength was reduced by vaporization of zinc. In the case of annealing in nitrogen and in air atmosphere, the sweating of lead was occurred. However, the inverse segregation of lead was suppressed by copper oxide layer on the surface annealed in air. This copper oxide layer leads to a decrease of the yield during fabrication process. Therefore, annealing of the alloy in nitrogen atmosphere is favorable in terms of the mechanical strength and yield.

  19. Computed tomography of a medium size Roman bronze statue of Cupid

    Energy Technology Data Exchange (ETDEWEB)

    Bettuzzi, M.; Brancaccio, R. [University of Bologna, Department of Physics and Astronomy, Bologna (Italy); Casali, F.; Morigi, M.P. [University of Bologna, Department of Physics and Astronomy, Bologna (Italy); Centro Fermi, Rome (Italy); Carson, D.; Chiari, G. [Getty Conservation Institute, Los Angeles, CA (United States); Maish, J. [The J. Paul Getty Museum, Los Angeles, CA (United States)

    2015-01-14

    Diagnostics based on X-ray computed tomography (CT) are becoming increasingly important, not only in the medical field but in industry and cultural heritage. CT devices typical for medical applications, however, can seldom be used on art objects because both they are not easily transportable and they often present high X-ray absorption. It is therefore necessary to make use of portable instrumentation and/or to develop tomographic systems optimized to the characteristics of the objects under examination. This work describes the computed tomography of a first century A.D. Roman bronze statue of Cupid (96.AB.53) in the collection of the J. Paul Getty Museum, within the collaborative framework between the Getty Conservation Institute and the Department of Physics and Astronomy (DIFA) of the University of Bologna (Italy). The tomography performed at the Getty facilities employed a 450 kV X-ray tube and a detection system developed at DIFA. The study highlighted the casting and construction techniques used by Roman foundry workers and provided information on the status of conservation of the statue. A 3D virtual reconstruction allowed the user to define different cross-sections enabling the study of the internal features. (orig.)

  20. The water clock of the Bronze Age (Northern Black Sea Coast)

    CERN Document Server

    Vodolazhskaya, Larisa N; Nevsky, Mikhail Yu

    2015-01-01

    In the article presents the results of the multidisciplinary study conducted with the help of archaeological, physical and astronomical methods. The aim of the study was to analyze and interpret marks and drawings applied to the surface of the vessel of the Bronze Age (Srubna culture) found near the Staropetrovsky village (Donetsk region, Ukraine) near the border between the Donetsk and Lugansk regions. The carried out calculations and measurements possible to prove that staropetrovsky vessel is the most ancient water clock, discovered on the territory of Europe, and have approximately the same age as the oldest known ancient Egyptian water clock. Such vessels - water clocks were needed for Srubna population to mark sundial, which had recently been discovered in the Northern Black Sea Coast. Based on the analysis of marks on the outside of the vessel, it was revealed that Staropetrovsky vessel is unique ancient complex device for measuring time and at the same time using a water clock, and with the help of a ...

  1. Mitochondrial DNA analysis of Bronze Age horses recovered from Chifeng region, Inner Mongolia, China

    Institute of Scientific and Technical Information of China (English)

    Cai Dawei; Han Lu; Xie Chengzhi; Li Shengnan; Zhou Hui; Zhu Hong

    2007-01-01

    In this study, mitochondrial DNA (mtDNA) analysis was carried out on 9 Bronze Age horses recovered from Dashanqian and Jinggouzi archaeological sites in Chifeng region, Inner Mongolia, China to explore the origin of Chinese domestic horses. Both mtDNA 16S rRNA gene and control region (D-loop) fragments of ancient horses were amplified and sequenced. The analysis of the highly conservative 16S rRNA gene sequences indicated that the burial environment of Chifeng region is suitable for the preservation of ancient DNA (aDNA). Combing 465 mtDNA D-loop sequences representing different breeds from East Asia, Central Asia, Near East and Europe, we constructed a phylogenetic network to investigate the relationship between ancient and modern horses. The phylogenetic network showed that the 9 horses were distributed into different modem horse clusters which were closely related to them representing a certain ge-ographical distribution. Our results showed that the maternal genetic line of the ancient horses in Chifeng region was highly diversified,which contributed to the gene pool of modern domestic horses and suggested a complex origin of domestic horses in China.

  2. Leather material found on a 6th B.C. Chinese bronze sword: A technical study

    Science.gov (United States)

    Luo, Wugan; Si, Yi; Wang, Hongmin; Qin, Ying; Huang, Fengchun; Wang, Changsui

    2011-09-01

    During July to November, 2006, an important archaeological excavation was conducted in Yun country, Hubei province, southern China. Chinese archaeologists found some remnant of leather materials, covered with red pigments, on a 6th century B.C. Chinese bronze sword. To understand the technology/ies that may have been utilized for manufacturing the leathers, a combined of Raman spectroscopy, FT-IR and XRF was thus applied to the remnant of leather materials. Raman analyses showed that red pigment on the leather was cinnabar (HgS). FT-IR and XRF analyses indicated that the content of some elements, such as Ca (existing as CaCO 3) and Fe (existing as Fe 2O 3), were much higher than those in the surrounding grave soil. The results inferred an application of lime depilation and retting, and the Fe-Al compound salt as tanning agent. And it was furthermore implicated that the Fe-Al salt tanning technique had been developed in the middle and late Spring and Autumn Period of China.

  3. Origin of ferroelectric polarization in tetragonal tungsten-bronze-type oxides

    Science.gov (United States)

    Olsen, Gerhard Henning; Aschauer, Ulrich; Spaldin, Nicola A.; Selbach, Sverre Magnus; Grande, Tor

    2016-05-01

    The origin of ferroelectric polarization in tetragonal tungsten-bronze- (TTB-) type oxide strontium barium niobate (SBN) is investigated using first-principles density functional calculations. We study in particular the relationship between the polarization and the cation and vacancy ordering on alkali-earth metal lattice sites. Lattice dynamical calculations for paraelectric structures demonstrate that all cation configurations that can be accommodated in a 1 ×1 ×2 supercell result in a single unstable polar phonon, composed primarily of relative Nb-O displacements along the polar axis, as their dominant instability. The majority of the configurations also have a second octahedral tilt-mode instability which couples weakly to the polar mode. The existence of the tilt mode is strongly dependent on the local cation ordering, consistent with the fact that it is not found experimentally. Our results suggest that ferroelectricity in the SBN system is driven by a conventional second-order Jahn-Teller mechanism caused by the d0 Nb5 + cations, and demonstrate the strong influence of the size of Sr and Ba on the lattice distortions associated with polarization and octahedral tilting. Finally, we suggest a mechanism for the relaxor behavior in Sr-rich SBN based on Sr displacement inside pentagonal channels in the TTB structure.

  4. The examination, analysis and conservation of a bronze Egyptian Horus statuette

    Energy Technology Data Exchange (ETDEWEB)

    Smith, A. [Conservation Department, Ditsong: National Museum of Cultural History, PO Box 28088, Sunnyside, Pretoria 0132 (South Africa); Botha, H. [South African Institute for Objects Conservation, PO Box 122, Joubertina 6410 (South Africa); Beer, F.C. de, E-mail: frikkie.debeer@necsa.co.za [Radiation Science, Necsa, PO Box 582, Pretoria 0001 (South Africa); Ferg, E. [Department of Chemistry, Nelson Mandela Metropolitan University, PO Box 77000, Port Elizabeth 6031 (South Africa)

    2011-09-21

    The production techniques, corrosive deterioration, conservation and questions regarding authenticity of a small Egyptian bronze statuette of the Child Horus (in the collection of the Ditsong: National Museum of Cultural History in Pretoria) was scientifically examined and analysed. The statuette dates to Egypt's 12th Dynasty. When the statuette was damaged, it was considered the appropriate time to obtain valuable information about its history and background through scientific research. Neutron tomography (NT), a relatively new non-destructive technique (NDT) to the South African R and D community to study museum objects, was applied to perform this research. The results from NT were supported by additional tests done through XRF and XRD analyses of samples taken from the damaged statuette. Results revealed that the lost-wax method was used in the manufacturing process. The extent of the restoration and materials used can be verified and as a result the deterioration of the object can now be monitored. This paper describes in detail the analytical techniques used in the study and how it contributed to the conservation of the statuette and its authenticity.

  5. Canine transposition in prehistoric Pakistan: Bronze Age and Iron Age case reports.

    Science.gov (United States)

    Lukacs, J R

    1998-10-01

    This report documents two prehistoric cases of canine-first premolar transposition (Mx.C.P1) from the Indo-Pakistan subcontinent. Recent discussion of the etiology of canine transposition and reports of high prevalence for the condition in modern India accentuate the significance of the ancient cases reported there. Case 1 is from the Iron Age site of Sarai Khola in northern Pakistan (1000 BC). The specimen, an adult female, 25 to 30 years of age at death, exhibits unilateral Mx.C.P1 transposition on the left side. The condition is associated with a barrel-shaped maxillary left third molar in an otherwise normal and healthy maxillary dental arch. Case 2 is from the Bronze Age urban site of Harappa (2500 BC), an important center of the Indus Valley Civilization. In this specimen, an adult female, transposition is bilateral, resulting in displacement of premolars and large diastemata between the maxillary lateral incisors and first premolars. Bilateral agenesis of maxillary third molars and rotation of maxillary and mandibular teeth occur with transposition in this specimen. In neither case are the lateral incisors reduced in size, peg-shaped, or congenitally absent. This report of Mx.C.P1 transposition in prehistoric times is significant because it provides historical documentation for the female predilection of the trait and establishes its co-occurrence with specific dental variants, such as agenesis, reduction, and rotation of teeth. PMID:9770107

  6. Dental paleopathology and agricultural intensification in south Asia: new evidence from Bronze Age Harappa.

    Science.gov (United States)

    Lukacs, J R

    1992-02-01

    Patterns of dental disease among Bronze Age people of the Indus Valley Civilization are currently based on early and incomplete reports by non-specialists. This deficiency precludes accurate diachronic analysis of dental disease and its relationship with increasing agriculturalism in the Indian subcontinent. The objective of this paper is to document prevalence of dental disease at Harappa (2500-2000 B.C.), Punjab Province, Pakistan, comparatively evaluate the Harappan dental pathology profile, and use these data to assess theories regarding the dental health consequences of increasingly intensive agricultural dependence. Pathological conditions of the dentition included in the study are abscesses, ante-mortem tooth loss (AMTL), calculus, caries, hypoplasia, hypercementosis, pulp chamber exposure, and alveolar resorption. The Harappan dentition exhibits a dental pathology profile typical of a population whose subsistence base is agriculture. Dental caries at Harappa are present in 6.8% (n = 751) of the teeth and 43.6% (n = 39) of the more completely preserved dental specimens. The use of a caries correction factor is recommended to permit an estimate of caries induced AMTL in calculating the caries prevalence. All dental lesions are present at higher rates in this Harappan study sample than were reported in previous investigations, and important differences in prevalence of dental disease occur between the genders. Prevalence of dental disease increases in the greater Indus Valley as subsistence becomes more intensive and as food preparation and storage technology becomes more efficient. PMID:1543240

  7. Genetic evidence for an origin of the Armenians from Bronze Age mixing of multiple populations.

    Science.gov (United States)

    Haber, Marc; Mezzavilla, Massimo; Xue, Yali; Comas, David; Gasparini, Paolo; Zalloua, Pierre; Tyler-Smith, Chris

    2016-06-01

    The Armenians are a culturally isolated population who historically inhabited a region in the Near East bounded by the Mediterranean and Black seas and the Caucasus, but remain under-represented in genetic studies and have a complex history including a major geographic displacement during World War I. Here, we analyse genome-wide variation in 173 Armenians and compare them with 78 other worldwide populations. We find that Armenians form a distinctive cluster linking the Near East, Europe, and the Caucasus. We show that Armenian diversity can be explained by several mixtures of Eurasian populations that occurred between ~3000 and ~2000 bce, a period characterized by major population migrations after the domestication of the horse, appearance of chariots, and the rise of advanced civilizations in the Near East. However, genetic signals of population mixture cease after ~1200 bce when Bronze Age civilizations in the Eastern Mediterranean world suddenly and violently collapsed. Armenians have since remained isolated and genetic structure within the population developed ~500 years ago when Armenia was divided between the Ottomans and the Safavid Empire in Iran. Finally, we show that Armenians have higher genetic affinity to Neolithic Europeans than other present-day Near Easterners, and that 29% of Armenian ancestry may originate from an ancestral population that is best represented by Neolithic Europeans. PMID:26486470

  8. Aerobic swimming performance of juvenile largemouth bronze gudgeon (Coreius guichenoti) in the Yangtze River.

    Science.gov (United States)

    Tu, Zhiying; Li, Liping; Yuan, Xi; Huang, Yingping; Johnson, David

    2012-06-01

    Largemouth bronze gudgeon (Coreius guichenoti), a fish species once abundant in the Yangtze River, has been rapidly declining in recent years. One important factor, among many, is the interruption of the free-flowing rivers by dams. To obtain data that can be applied to the design of an effective fishway for C. guichenoti and other species in the fish community, a laboratory study of juvenile C. guichenoti's swimming ability and energetics was conducted in a flume-type respirometer equipped with a high-speed video camera system to record swimming behavior. The critical swimming speed (Ucrit ), standard metabolic rate (SMR), and maximum metabolic rate (MO2,max ) were determined during steady swimming at four water temperatures (10, 15, 20, and 25°C). A power function accurately describes the relationship between oxygen consumption rate (MO2 ) and swimming speed (U) at the four temperatures. The Ucrit , SMR, MO2,max , and metabolic scope increased with increasing temperature. The relationship between cost of transport (COT) and U was characteristically inverse bell-shaped, with minimum COT at Uopt = 4.5-5.0 body lengths per second (bl sec(-1)). This investigation provides data on the swimming ability of C. guichenoti that will add to the basic science required for fishway design.

  9. The questionable contribution of the Neolithic and the Bronze Age to European craniofacial form.

    Science.gov (United States)

    Brace, C Loring; Seguchi, Noriko; Quintyn, Conrad B; Fox, Sherry C; Nelson, A Russell; Manolis, Sotiris K; Qifeng, Pan

    2006-01-01

    Many human craniofacial dimensions are largely of neutral adaptive significance, and an analysis of their variation can serve as an indication of the extent to which any given population is genetically related to or differs from any other. When 24 craniofacial measurements of a series of human populations are used to generate neighbor-joining dendrograms, it is no surprise that all modern European groups, ranging all of the way from Scandinavia to eastern Europe and throughout the Mediterranean to the Middle East, show that they are closely related to each other. The surprise is that the Neolithic peoples of Europe and their Bronze Age successors are not closely related to the modern inhabitants, although the prehistoric/modern ties are somewhat more apparent in southern Europe. It is a further surprise that the Epipalaeolithic Natufian of Israel from whom the Neolithic realm was assumed to arise has a clear link to Sub-Saharan Africa. Basques and Canary Islanders are clearly associated with modern Europeans. When canonical variates are plotted, neither sample ties in with Cro-Magnon as was once suggested. The data treated here support the idea that the Neolithic moved out of the Near East into the circum-Mediterranean areas and Europe by a process of demic diffusion but that subsequently the in situ residents of those areas, derived from the Late Pleistocene inhabitants, absorbed both the agricultural life way and the people who had brought it. PMID:16371462

  10. THE PALEODEMOGRAPHIC PATTERN OF OYLUM HOYUK POPULATION (THE MIDDLE BRONZE AGE, KİLİS

    Directory of Open Access Journals (Sweden)

    Ayşen Açıkkol Yıldırım

    2013-12-01

    Full Text Available In this study skeleton remaining of 72 individuals excavated from Middle Bronze Age layers of Oylum Höyük (mound situated in Kilis province, were studied. Sex and age of skeletons, unearthed between 2007-2012, were determined and life tables of the population were formed. Mortality of infants and children of Oylum population was very high. Death rates were determined as 36.6 % for 0-5 years of age group, 57.75 % for 0-15 years of age group. 34.62 % of infants and children from 0-5 years of age group died before they completed their 1st year. Lifespan of males were longer than females (25 for females, 33 years for males. Average age of adults was 29. Mortality for females was highest in young adult period (18-30 ages however it becomes more prominent at adulthood period (30-45 years in males. Oylum Höyük population has one of the shortest lifespan among ancient Anatolian populations with its very high subadult death ratios. Paleopathological data states that, individuals were exposed to serious stress during growth period and reproductive period is the most dangerous period for females.

  11. Sliding Wear Response of a Bronze Bushing: Influence of Applied Load and Test Environment

    Science.gov (United States)

    Prasad, B. K.

    2012-10-01

    This investigation pertains to the examination of the sliding wear behavior of a leaded-tin bronze bushing under the conditions of varying applied loads and test environments against a steel shaft. The test environment was changed by adding 5% of solid lubricants like talc and lead to an oil lubricant separately as well as in combination; the fraction of the two (solid) lubricants within the solid lubricant mixture was varied in the range of 25-75% in the latter case. The wear performance of the bushing was characterized in terms of the wear rate, frictional heating, and friction coefficient. The increasing load led to deterioration in the wear response, while the addition of the solid lubricant particles produced a reverse effect. Further, an appreciable difference in the wear behavior was not observed when the tests were conducted in the oil plus talc and oil plus lead lubricant mixtures. However, the oil containing lead and talc together brought about a significant improvement in the wear response; best results were obtained in the case of the lubricant mixture consisting of lead and talc together in the ratio of 3:1 in the oil. The observed wear behavior of the samples has been discussed in terms of specific characteristics of various microconstituents. The features of the wear surfaces and subsurface regions further substantiated the wear response and enabled us to understand the operating material removal mechanisms.

  12. Fabricating Superior NiAl Bronze Components through Wire Arc Additive Manufacturing

    Directory of Open Access Journals (Sweden)

    Donghong Ding

    2016-08-01

    Full Text Available Cast nickel aluminum bronze (NAB alloy is widely used for large engineering components in marine applications due to its excellent mechanical properties and corrosion resistance. Casting porosity, as well as coarse microstructure, however, are accompanied by a decrease in mechanical properties of cast NAB components. Although heat treatment, friction stir processing, and fusion welding were implemented to eliminate porosity, improve mechanical properties, and refine the microstructure of as-cast metal, their applications are limited to either surface modification or component repair. Instead of traditional casting techniques, this study focuses on developing NAB components using recently expanded wire arc additive manufacturing (WAAM. Consumable welding wire is melted and deposited layer-by-layer on substrates producing near-net shaped NAB components. Additively-manufactured NAB components without post-processing are fully dense, and exhibit fine microstructure, as well as comparable mechanical properties, to as-cast NAB alloy. The effects of heat input from the welding process and post-weld-heat-treatment (PWHT are shown to give uniform NAB alloys with superior mechanical properties revealing potential marine applications of the WAAM technique in NAB production.

  13. Microstructure and properties of an ordered and a disordered ship propeller bronze

    Energy Technology Data Exchange (ETDEWEB)

    Benkisser, G.; Winkel, G. [Rostock Univ. (Germany); Eberlein, J.; Kaps, R. [Mecklenburger Metallguss Waren (Germany)

    2000-07-01

    The purpose of this paper is a presentation of the investigation results on the influence of the chemical composition and the casting conditions on the transformation behaviour, the microstructure and the properties of the complex aluminium bronzes. By the solidification of the melt is produced the bcc high temperature phase {beta}. In dependence on the cooling time the {beta} - phase transforms in several product phases. In the ordered alloy additionally occur an ordering transformation of the {beta} - phase. Both alloys investigated posses in the sand cast state a heterogenous, coarse grained microstructure. The predominant part of the microstructure is the fcc {alpha} - phase. The lamellar quasieutectoid ({alpha} + {kappa}{sub 3}) and several types of {kappa} - segregates are further parts in the microstructure of the ordered alloy. The {gamma}{sub 2} - phase appears not in the microstructure. In the microstructure of the disordered alloy the retained bcc {beta} - phase and also {kappa} - segregates additionaly exist. The mechanical properties of the alloys depend on the chemical composition and the processing, especially on the cast wall thickness, because the thickness determines the cooling time and in connection with it the transformation behaviour and the phase composition, the grain size and the form and distribution of the phases in the microstructure. The ordered alloy has a higher cavitation resistance in comparison to the disordered alloy. (orig.)

  14. High temperature performance of arc-sprayed aluminum bronze coatings for steel

    Institute of Scientific and Technical Information of China (English)

    ZHANG Zhong-li; LI De-yuan; WANG Shui-yong

    2006-01-01

    The high-temperature oxidation behavior of arc-sprayed aluminum bronze coatings on steel substrate was studied during isothermal exposures in air at 900 ℃. The surface morphologies and interface of the coatings after isothermal oxidation at 900 ℃ for different times were observed. The experiments showed that the coatings on steel substrate were not deteriorated and the substrate was protected well, being exposed to high temperatures up to 900 ℃. The coatings withstood more than ten times thermal shock tests without any coating separation. The thermal expansion coefficient of the coatings was measured, revealing not much difference between it and that of steel substrate. After exposure at high temperature, the coatings were still adhered to steel substrate well.Isothermal mass gain of the coatings at elevated temperature in dry air was measured by means of a thermal balance and the oxidation behavior was evaluated by oxidation kinetic curves, exhibiting the oxidation kinetics curve accorded with a parabolic law.The parabolic rate constant of the oxidation kinetic curve is 1.02× 10-9 g2·cm-4·s-1 for the first 60 min and from 150 min to 2 880 min the constant is 5.1 × 10-12 g2·cm-4·s-1.

  15. Potential of 5-methyl 1-H benzotriazole to suppress the dissolution of α-aluminum bronze in sulfide-polluted salt water

    Energy Technology Data Exchange (ETDEWEB)

    Nazeer, Ahmed Abdel; Ashour, E.A. [National Research Centre, Electrochemistry Laboratory, Dokki, Cairo 12622 (Egypt); Allam, Nageh K., E-mail: nageh.allam@aucegypt.edu [National Research Centre, Electrochemistry Laboratory, Dokki, Cairo 12622 (Egypt); Energy Materials Laboratory, Physics Department, School of Sciences and Engineering, The American University in Cairo, P.O. Box 74, New Cairo 11835 (Egypt)

    2014-03-01

    This work investigates the inhibition effect of 5-methyl 1-H benzotriazole (MBT) on the dissolution behavior of α-aluminum bronze in clean and sulfide-polluted salt water using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), electrochemical frequency modulation (EFM) and scanning electron microscopy (SEM) techniques. The inhibition efficiency increases with the increasing MBT concentration and decreases with the increasing temperature. The adsorption process of MBT is spontaneous and follows Langmuir adsorption isotherm model. MBT possesses excellent inhibiting effect for the corrosion of α-Al-bronze, which acts as a mixed type inhibitor. Thermodynamic and kinetic parameters for the adsorption process were determined. The presence of sulfide ions (2 ppm) decreases the inhibition efficiency of MBT against the corrosion of Al-bronze alloy in chloride solutions from 94.7% to 89% as also confirmed via SEM images. The results obtained from the different techniques were in good agreement, which prove the validity of these tools in the measurements of the tested inhibitor. - Highlights: • MBT is an excellent mixed corrosion inhibitor for bronze. • There is a competitive adsorption between MBT and sulfide ions to adsorb on bronze surface. • The adsorption of MBT is spontaneous and follows Langmuir model. • CPE decreases significantly with the increasing MBT concentration.

  16. The effect of low-dose neutron irradiation on mechanical properties, electrical resistivity and fracture of NiAl bronze for ITER

    International Nuclear Information System (INIS)

    Nickel-aluminum bronze is a candidate material for several applications for ITER in-vessel components such as divertor and blanket attachments and remote handling equipment. This paper presents the first results of an experimental investigation of the effect of neutron irradiation on mechanical properties, fracture characteristics and electrical resistivity of NiAl bronze. Specimens of NiAl bronze were irradiated at 150 oC and 300 oC to doses of 10-3; 10-2; 0.7 * 10-1 dpa in the RBT-6 reactor (Φt therm/Φt fast ∼ 1) in Dimitrovgrad. It was shown that irradiation at 150 oC leads to minor changes of tensile properties, whereas irradiation at 300 oC results in significant loss of ductility at damage dose of 0.07 dpa. The change of electrical resistively of NiAl bronze is low, ∼3% at the maximum dose studied. The reasons for the high-radiation resistance of NiAl bronze in comparison with copper and copper alloys are discussed

  17. 古滇王国青铜器的造型艺术研究%Research on Bronze Aesthetic Art of the Ancient Dian Kinadom

    Institute of Scientific and Technical Information of China (English)

    张吉洪

    2012-01-01

    Bronze art from the Ancient Dian Kingdom of Yunnan is an especially charming segment of China' s ancient bronze culture. Ancient Dian bronze art is famous for its outstanding aesthetics and intricate details. The firm conceptualization and practicality underpinning its stunning appearance has put it in a class of its own. The Ancient Dian had rendered numerous aspects of their civilization' s culture on bronze art -- farming, livestock, textiles, hunting and war, among others. They have created their animated history on bronze.%云南古滇青铜器的艺术魅力,是中华民族古代青铜文化中的一支夺目的奇葩,以其造型精美奇特、纹饰细腻丰富闻名于世,其写实性之强,构思巧妙,独树一帜。滇国的先民们把当时耕作、畜牧、纺织、狩猎、战争等各种社会生活场景凝聚在青铜器上,用自己的双手铸造了一部生动的青铜史诗。

  18. Cultura innovativa para la universidad de servicio en el marco de la responsabilidad social universitaria

    Directory of Open Access Journals (Sweden)

    César Ramos Parra

    2012-01-01

    Full Text Available El objetivo de esta investigación fue formular estrategias para impulsar el desarrollo de una cultura innovativa para la universidad de servicio en el marco de la responsabilidad social universitaria. La metodología fue de tipo descriptiva, de campo, no experimental, transeccional, tomando como población las universidades públicas del estado Zulia. Los resultados develan la necesidad de fortalecer una cultura de grupo y de trabajo en equipo, como manera de integrar el valioso capital humano de las universidades -una de sus mayores fortalezas-, como mecanismo viable para incrementar el sentido de pertenencia y compromiso con la institución y las políticas institucionales.

  19. Uranium in the Surrounding of San Marcos-Sacramento River Environment (Chihuahua, Mexico)

    Science.gov (United States)

    Rentería-Villalobos, Marusia; Cortés, Manuel Reyes; Mantero, Juan; Manjón, Guillermo; García-Tenorio, Rafael; Herrera, Eduardo; Montero-Cabrera, Maria Elena

    2012-01-01

    The main interest of this study is to assess whether uranium deposits located in the San Marcos outcrops (NW of Chihuahua City, Mexico) could be considered as a source of U-isotopes in its surrounding environment. Uranium activity concentrations were determined in biota, ground, and surface water by either alpha or liquid scintillation spectrometries. Major ions were analyzed by ICP-OES in surface water and its suspended matter. For determining uranium activity in biota, samples were divided in parts. The results have shown a possible lixiviation and infiltration of uranium from geological substrate into the ground and surface water, and consequently, a transfer to biota. Calculated annual effective doses by ingestion suggest that U-isotopes in biota could not negligibly contribute to the neighboring population dose. By all these considerations, it is concluded that in this zone there is natural enhancement of uranium in all environmental samples analyzed in the present work. PMID:22536148

  20. Solar EUV irradiance from the San Marco ASSI - A reference spectrum

    Science.gov (United States)

    Schmidtke, Gerhard; Woods, Thomas N.; Worden, John; Rottman, Gary J.; Doll, Harry; Wita, Claus; Solomon, Stanley C.

    1992-11-01

    The only satellite measurement of the solar EUV irradiance during solar cycle 22 has been obtained with the Airglow Solar Spectrometer Instrument (ASSI) aboard the San Marco 5 satellite flown in 1988. The ASSI in-flight calibration parameters are established by using the internal capabilities of ASSI and by comparing ASSI results to the results from other space-based experiments on the ASSI calibration rocket and the Solar Mesospheric Explorer (SME). A solar EUV irradiance spectrum derived from ASSI observations on November 10, 1988 is presented as a reference spectrum for moderate solar activity for the aeronomy community. This ASSI spectrum should be considered as a refinement and extension of the solar EUV spectrum published for the same day by Woods and Rottman (1990).

  1. Marco conceptual para la evaluación de programas de salud

    Directory of Open Access Journals (Sweden)

    Montero Rojas, Eiliana

    2004-03-01

    Full Text Available La evaluación como disciplina es un área relativamente nueva de las Ciencias Sociales; consecuentemente, su incorporación explícita en los programas y sistemas de salud ha llegado algo tardíamente. Este artículo presenta elementos de un marco conceptual para concebir y utilizar la evaluación en programas de salud. Se define la evaluación como una herramienta para la toma de decisiones, se discuten tendencias y temáticas de actualidad en el campo y también conceptos clave tales como teoría del programa y valoración de necesidades. Finalmente, se esboza una primera aproximación a dos constructos de gran interés en la evaluación de programas de salud: calidad y equidad.

  2. Interacción universidad y entorno: marco para el emprendimiento

    Directory of Open Access Journals (Sweden)

    Pedro Emilio Sanabria-Rangel

    2015-01-01

    Full Text Available El documento desarrolla el tema de la relación universidad-entorno, especialmente en lo que se refiere a la vinculación con el sector productivo como parte del desarrollo de la función de extensión universitaria. El propósito fundamental es proporcionar un marco de referencia para la creación o justificación de las unidades de emprendimiento universitarias como mecanismo de enlace para el desarrollo de la función extensión desde una de sus aproximaciones: el enfoque empresarial. Como resultado, se evidencian los enfoques, los modelos, los mecanismos y las estrategias de interacción universidad-entorno; se realiza una reflexión sobre el emprendimiento como medio para dicha interacción y se muestran las condiciones estructurales que favorecen el emprendimiento universitario.

  3. Marco conceptual para la evaluación de programas de salud

    Directory of Open Access Journals (Sweden)

    Eiliana Montero Rojas

    2004-01-01

    Full Text Available La evaluación como disciplina es un área relativamente nueva de las Ciencias Sociales; consecuentemente, su incorporación explícita en los programas y sistemas de salud ha llegado algo tardíamente. Este artículo presenta elementos de un marco conceptual para concebir y utilizar la evaluación en programas de salud. Se define la evaluación como una herramienta para la toma de decisiones, se discuten tendencias y temáticas de actualidad en el campo y también conceptos clave tales como teoría del programa y valoración de necesidades. Finalmente, se esboza una primera aproximación a dos constructos de gran interés en la evaluación de programas de salud: calidad y equidad.

  4. Marco de trabajo de presentación para aplicaciones J2EE : MTP

    OpenAIRE

    Alonso de Motta, José

    2012-01-01

    Diseño e implementación de un marco de trabajo de presentación para aplicaciones J2EE. Análisis de los frameworks de mercado Struts 2, JavaServer Faces y Spring MVC. Patrones de diseño MVC, Core J2EE Patterns y patrones de diseño para programación orientada a objetos (Design Patterns, Elements of Reusable Object-Oriented Software). Aplicación de autoservicio de socios para una asociación de padres y madres de alumnos para demostración de uso del framework MTP y de la definición de una arquite...

  5. Teoría de los marcos relacionales y la trasformación de las funciones del estímulo

    Directory of Open Access Journals (Sweden)

    Simon Dymond

    2005-01-01

    Full Text Available La teoría de los marcos de relaciones es una teoría y tecnología moderna del lenguaje y la cognición que hace gran énfasis en la trasformación de funciones de estímulo de acuerdo con las relaciones múltiples del estímulo. Revisamos la investigación reciente sobre la trasformación de las funciones de estímulo y argumentamos que la trasformación derivada posee importancia clínica, no solo porque da cuenta de la emergencia de nuevas respuestas ante estímulos previamente neutrales en ausencia de condicionamiento directo, sino porque también ayuda a explicar el desarrollo de nuevas estrategias de evitación y su rápida generalización. Posteriormente se delinean posibles restricciones sobre el efecto de la trasformación derivada por formas físicas del estímulo. En conclusión, el análisis básico y aplicado en curso del fenómeno de la trasformación de funciones representa uno de los más importantes desafíos y oportunidades para el análisis moderno de la conducta

  6. Los países del Este y la transición al mercado: hacia la formación del marco institucional

    Directory of Open Access Journals (Sweden)

    Luis Fernando Macias

    1994-01-01

    Full Text Available La transición al mercado ha sido para los países del Este de Europa el paso de la euforia inicial al desengaño generalizado. Las medidas adoptadas por los nuevos dirigentes con el propósito de reanimar la economía y sacarla de la crisis han conducido a lo contrario: la caída de la producción, la aparición del desempleo y el desplome del nivel de vida. Esta situación lleva al autor a través del artículo y a la luz de los acontecimientos recientes en la región, que han conducido a una modificación de las formas de propiedad dominantes existentes durante el período del socialismo real, a plantear la necesaria redefinición del marco socio-institucional que conduzca no sólo al desmonte del sistema centralista-burocrático de gestión, sino que se dirija también, y ésto es lo fundamental, al normal funcionamiento de una economía de mercado. Es esto último lo que el artículo se encarga de desglosar mientras explica, en ese nuevo contexto, los cambios que se deben realizar tanto en el factor humano corno en los sistemas legal y contable.

  7. The fallacy of "equal treatment" in Brazil's bill of rights for internet users A falácia da "igualdade de tratamento" na carta brasileira de direitos dos usuários da internet

    Directory of Open Access Journals (Sweden)

    J. Gregory Sidak

    2012-12-01

    Full Text Available The "Brazilian bill of rights for internet users," or "marco civil," has been under consideration at the brazilian congress since 2011. Marco civil's provisions for network neutrality have been particularly controversial. Proponents of network neutrality in Brazil advocate for the "equal treatment" of all data packets, including banning internet service providers from offering to content providers the option to purchase enhanced quality of service in the delivery of data packets. These network neutrality rules conflict with the other goals and principles of marco civil-particularly goals to promote internet access, to foster innovation, and to protect the constitutional right of freedom of speech and the free flow of information.A "carta Brasileira de direitos dos usuários da internet," ou "marco civil," tramita no congresso Brasileiro desde 2011. As disposições do marco civil relativas à neutralidade de rede são particularmente controversas. Os defensores da neutralidade de rede no Brasil advogam pela "igualdade de tratamento" de todos os pacotes de dados, inclusive proibindo que provedores de serviço de acesso à internet ofereçam aos provedores de conteúdo a opção de adquirir uma melhor qualidade de serviço na entrega de pacotes de dados. Essas disposições relativas à neutralidade de rede conflitam com outros objetivos e princípios do marco civil - especialmente os objetivos de promover o acesso à internet, promover a inovação, e garantir o direito constitucional de liberdade de expressão e informação.

  8. Marco Orientador del Ordenamiento Territorial Sustentable – Subsistema de Asentamientos Humanos (mapa Región Metropolitana de Santiago)

    OpenAIRE

    CONTRERAS-ALONSO, Miguel; Opazo, Daniel; UBILLA-BRAVO, Gerardo; Cecilia Núñez-Pino; Oliva-Mellado, Roberto; Hermosilla-Rumié, Vladimir; Saa-Vidal, René

    2004-01-01

    Mapa del Subsistema de Asentamientos Humanos del Marco Orientador del Ordenamiento Territorial (MOT) del Proyecto "Ordenamiento Territorial Ambientalmente Sustentable" (OTAS). El área corresponde a la Región Metropolitana de Santiago y su escala geográfica es 1:250.000.

  9. Marco Orientador del Ordenamiento Territorial Sustentable – Subsistema Socioproductivo (mapa Región Metropolitana de Santiago)

    OpenAIRE

    CONTRERAS-ALONSO, Miguel; UBILLA-BRAVO, Gerardo; Opazo, Daniel; NÚÑEZ-PINO, Cecilia; Oliva-Mellado, Roberto; Hermosilla-Rumié, Vladimir; Saa-Vidal, René

    2004-01-01

    Mapa del Subsistema Socioproductivo del Marco Orientador del Ordenamiento Territorial (MOT) del Proyecto "Ordenamiento Territorial Ambientalmente Sustentable" (OTAS). El área corresponde a la Región Metropolitana de Santiago y su escala geográfica es 1:250.000.

  10. Marco Orientador del Ordenamiento Territorial Sustentable – Subsistema Físico Ambiental (mapa Región Metropolitana de Santiago)

    OpenAIRE

    CONTRERAS-ALONSO, Miguel; UBILLA-BRAVO, Gerardo; Opazo, Daniel; NÚÑEZ-PINO, Cecilia; Oliva-Mellado, Roberto; Hermosilla-Rumié, Vladimir; Saa-Vidal, René

    2004-01-01

    Mapa del Subsistema Físico Ambiental del Marco Orientador del Ordenamiento Territorial (MOT) del Proyecto "Ordenamiento Territorial Ambientalmente Sustentable" (OTAS). El área corresponde a la Región Metropolitana de Santiago y su escala geográfica es 1:250.000.

  11. William R.Johnson,Board Chairman and CEO of HJ.Heinz Company has won the Marco Polo Award 2006

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    @@ Thanks to the contribution in promoting the talents visit and trade communication between America and China,William R.Johnson,Board Chairman and CEO of H.J.Heinz Company has won the Marco Polo Award.Zhang Jianguo,Vice President of China Foreign Experts Bureau granted the award to him.

  12. Kaasaegse Kunsti Eesti Keskus kui kunstidiiler / Rael Artel, Kai Kaljo, Marco Laimre, Marge Monko ; intervjueerinud Reet Varblane

    Index Scriptorium Estoniae

    2010-01-01

    23. augustini 2010 saab KKEK juhataja kohale kandideerida. Vestlusringis osalenud vabakutseline kuraator Rael Artel, Tallinna Ülikooli dotsent, kunstnik Kai Kaljo, EKA fotoosakonna professor, kunstnik Marco Laimre ja EKA fotoosakonna dotsent, kunstnik Marge Monko arutavad, millist rolli peaks KKEK täitma praegu, 21. sajandi teisel kümnendil avatud maailma tingimustes

  13. Un marco de referencia de cinco dimensiones para la evaluación auténtica

    NARCIS (Netherlands)

    Gulikers, Judith; Bastiaens, Theo; Kirschner, Paul A.

    2011-01-01

    Gulikers, J. T. M., Bastiaens, Th. J., & Kirschner, P. A. (2010). Un marco de referencia de cinco dimensiones para la evaluación auténtica. (translation from English). Cuajimalpa, México: Aseguramiento de la Calidad en la Educacion y en el Trabajo.

  14. The formyl peptide receptor like-1 and scavenger receptor MARCO are involved in glial cell activation in bacterial meningitis

    Directory of Open Access Journals (Sweden)

    Jansen Sandra

    2011-02-01

    Full Text Available Abstract Background Recent studies have suggested that the scavenger receptor MARCO (macrophage receptor with collagenous structure mediates activation of the immune response in bacterial infection of the central nervous system (CNS. The chemotactic G-protein-coupled receptor (GPCR formyl-peptide-receptor like-1 (FPRL1 plays an essential role in the inflammatory responses of host defence mechanisms and neurodegenerative disorders such as Alzheimer's disease (AD. Expression of the antimicrobial peptide cathelicidin CRAMP/LL-37 is up-regulated in bacterial meningitis, but the mechanisms underlying CRAMP expression are far from clear. Methods Using a rat meningitis model, we investigated the influence of MARCO and FPRL1 on rCRAMP (rat cathelin-related antimicrobial peptide expression after infection with bacterial supernatants of Streptococcus pneumoniae (SP and Neisseria meningitides (NM. Expression of FPRL1 and MARCO was analyzed by immunofluorescence and real-time RT-PCR in a rat meningitis model. Furthermore, we examined the receptor involvement by real-time RT-PCR, extracellular-signal regulated kinases 1/2 (ERK1/2 phosphorylation and cAMP level measurement in glial cells (astrocytes and microglia and transfected HEK293 cells using receptor deactivation by antagonists. Receptors were inhibited by small interference RNA and the consequences in NM- and SP-induced Camp (rCRAMP gene expression and signal transduction were determined. Results We show an NM-induced increase of MARCO expression by immunofluorescence and real-time RT-PCR in glial and meningeal cells. Receptor deactivation by antagonists and small interfering RNA (siRNA verified the importance of FPRL1 and MARCO for NM- and SP-induced Camp and interleukin-1β expression in glial cells. Furthermore, we demonstrated a functional interaction between FPRL1 and MARCO in NM-induced signalling by real-time RT-PCR, ERK1/2 phosphorylation and cAMP level measurement and show differences between

  15. Implicaciones del marco teórico de lo imaginario en la Psicología Social

    Directory of Open Access Journals (Sweden)

    Teresa Aracena Vicente

    2015-03-01

    Full Text Available En el presente estudio abordaremos dos de las principales concepciones sobre los mecanismos implicados en la construcción significativa del mundo. Hablamos de la Teoría de las Representaciones Sociales (TRS, formulada desde la psicología, y del marco teórico de lo imaginario, formulado principalmente desde la antropología y la filosofía. Procederemos exponiendo, primero, la TRS y, posteriormente, los acercamientos al marco teórico de lo imaginario desde diferentes disciplinas, para señalar las aportaciones que ofrece este último a la psicología social, aportaciones éstas que complementan las de la TRS. Así, este estudio tiene como objetivos realizar un análisis teórico de la TRS y del marco teórico de lo imaginario y especificar las contribuciones e implicaciones del marco teórico de lo imaginario a la psicología social (y, más concretamente, a la psicología cultural de modo a observar cómo el concepto de imaginario social incluye y trasciende al de representación social(RS. Consideraremos las implicaciones ontológicas, epistemológicas, metodológicas y para la salud de la utilización del marco teórico de lo imaginario en la psicología cultural. En este sentido, propondremos la adopción de dicho concepto por la psicología, considerando que el mismo es fundamental por su capacidad explicativa, comprensiva, interpretativa y crítica.

  16. The influence of the chemical composition and temperature of plastic deformation on the PLC effect in tin bronzes

    Directory of Open Access Journals (Sweden)

    W. Ozgowicz

    2006-04-01

    Full Text Available Purpose: The aim of the present paper is the determination of the effect of the chemical composition and temperature of deformation of standardized tin bronzes and bronze modified with zirconium on the Portevin – Le Chatelier (PLC phenomenon, mainly basing on the shape of stress-strain curves within the temperature range of 100÷300oC and observations of their structure. The reasons of the occurrence of such en effect are so far no fully known and explained and the opinions concerning is physical basis vary.Design/methodology/approach: Of essential design in this research is determination of the dependence of PLC effect on the chemical composition, temperature and strain rate and the preliminary heat treatment and grain size. The main method used in this investigation is tensile test at elevated temperature.Findings: The main conclusions are following: the PLC effect on tin bronzes with a miero-addition of zirconium in an amount of 0.01÷0.05% depends the temperature of deformation in the tensile test in the range of 100÷300°C and the chemical composition of the alloys; the type of serration revealed on the δ–ε curve depend mainly on the temperature of deformation and can be differ during the respective stages of the analyzed curves.Practical implications: In this paper implications for practice are not taken into consideration.Originality/value: In this paper an additive type of serration observed on the curves δ–ε, denoted by the symbol D, is new.

  17. Extent of Variation of the Bacillus thuringiensis Toxin Reservoir: the Case of the Geranium Bronze, Cacyreus marshalli Butler (Lepidoptera: Lycaenidae)

    Science.gov (United States)

    Herrero, Salvador; Borja, Marisé; Ferré, Juan

    2002-01-01

    Despite the fact that around 200 cry genes from Bacillus thuringiensis have already been cloned, only a few Cry proteins are toxic towards a given pest. A crucial step in the mode of action of Cry proteins is binding to specific sites in the midgut of susceptible insects. Binding studies in insects that have developed cross-resistance discourage the combined use of Cry proteins sharing the same binding site. If resistance management strategies are to be implemented, the arsenal of Cry proteins suitable to control a given pest may be not so vast as it might seem at first. The present study evaluates the potential of B. thuringiensis for the control of a new pest, the geranium bronze (Cacyreus marshalli Butler), a butterfly that is threatening the popularity of geraniums in Spain. Eleven of the most common Cry proteins from the three lepidopteran-active Cry families (Cry1, Cry2, and Cry9) were tested against the geranium bronze for their toxicity and binding site relationships. Using 125I-labeled Cry1A proteins we found that, of the seven most active Cry proteins, six competed for binding to the same site. For the long-term control of the geranium bronze with B. thuringiensis-based insecticides it would be advisable to combine any of the Cry proteins sharing the binding site (preferably Cry1Ab, since it is the most toxic) with those not competing for the same site. Cry1Ba would be the best choice of these proteins, since it is significantly more toxic than the others not binding to the common site. PMID:12147511

  18. Tungsten bronze-based nuclear waste form ceramics. Part 1. Conversion of microporous tungstates to leach resistant ceramics

    Science.gov (United States)

    Luca, Vittorio; Griffith, Christopher S.; Drabarek, Elizabeth; Chronis, Harriet

    2006-11-01

    The effective immobilization of Cs + and/or Sr 2+ sorbed on hexagonal tungsten oxide bronze (HTB) adsorbent materials has been achieved by heating in air at temperatures in the range 500-1000 °C. Crystalline powdered HTB materials formed by heating at 800 °C displayed leach characteristics comparable to Cs-containing hot-pressed hollandites in the pH range from 0 to 12. If the Cs-loaded HTB sorbents were pressed into pellets prior to calcination, ceramic monoliths could be prepared with negligible Cs volatilization losses. Heating to temperatures in excess of 1250 °C under dynamic air flow resulted in the melting of the sorbent to form phase assemblages consisting of millimetre-sized crystals of bronzoid phases. Up to 5 wt% mass loss was observed for small scale samples of melted materials under dynamic air flow. Both the calcined and melted bronzoid waste forms are multiphase ceramics in which Cs + remains bound within, and appears to stabilize, the hexagonal bronze phase, even after complete melting at 1300 °C. The leachability of Sr from the phases prepared by heating appears to be somewhat worse than that of Cs. Saturation of the HTB adsorbents with lanthanide elements (Nd, La, Ce) gave rise to cubic bronze phases in which we propose that the lanthanides substitute at the tungsten or molybdenum sites rather than the tunnel positions. The lanthanides were rather easily leached from the calcined phases in 0.1 M HNO 3 at 150 °C.

  19. Agricultural production and stability of settlement systems in Upper Mesopotamia during the Early Bronze Age (third millennium BCE)

    Science.gov (United States)

    Kalayci, Tuna

    This study investigates the relationship between rainfall variation and rain-fed agricultural production in Upper Mesopotamia with a specific focus on Early Bronze Age urban settlements. In return, the variation in production is used to explore stability of urban settlement systems. The organization of the flow of agricultural goods is the key to sustaining the total settlement system. The vulnerability of a settlement system increases due to the increased demand for more output from agricultural lands. This demand is the key for the success of urbanization project. However, without estimating how many foodstuffs were available at the end of a production cycle, further discussions on the forces that shaped and sustained urban settlement systems will be lacking. While large scale fluctuations in the flow of agricultural products between settlements are not the only determinants of hierarchical structures, the total available agricultural yield for each urban settlement in a hierarchy must have influenced settlement relations. As for the methodology, first, Early Bronze Age precipitation levels are estimated by using modern day associations between the eastern Mediterranean coastal areas and the inner regions of Upper Mesopotamia. Next, these levels are integrated into a remote-sensing based biological growth model. Also, a CORONA satellite imagery based archaeological survey is conducted in order to map the Early Bronze Age settlement system in its entirety as well as the ancient markers of agricultural intensification. Finally, ancient agricultural production landscapes are modeled in a GIS. The study takes a critical position towards the traditionally held assumption that large urban settlements (cities) in Upper Mesopotamia were in a state of constant demand for food. The results from this study also suggest that when variations in ancient precipitation levels are translated into the variations in production levels, the impact of climatic aridification on ancient

  20. Roman Bronze Vessels From the Late Sarmatian Burial of the Lebedevka Burial-Ground in Western Kazakhstan

    Directory of Open Access Journals (Sweden)

    Treister Mikhail Yuryevich

    2015-12-01

    Full Text Available This paper is devoted to studying cultural monuments – bronze vessels, a jug and a basin from the barrow no. 1/1967 of the Lebedevka Late Sarmatian burial mound (Western Kazakhstan, dating back to the middle of the 3rd century AD at the latest. These items do not find exact parallels among the bronze vessels of provincial Rome. Although the shape of the jug handle with a curved leaf turned upright between two horizontally arranged swan heads has parallels on the so-called “composite jug with handles” (“gegliederten Henkelkrügen”, the cylindrical form of the jug’s neck peculiar of the glass jugs of allegedly Syrian manufacture of the second half of the 3rd-4th centuries AD is very unusual. Even more unusual is a basin with horizontally bent rim and elaborate handles with pearls on a high narrow stand-ring. The XRF analyses of the Lebedevka jug’s metal revealed that its body and handle were made of a copper-based alloy with very high admixtures of zinc (24-27 % and inconsiderable additions of lead (up to 3 %. A similar alloy was used for manufacturing a vessel in the form of a crouching young negro from Niederbieber. Most objects of provincial Roman import reached Western Kazakhstan via the Bosporan kingdom along the Northern branch of the Silk Road. The above discussed bronze vessels from Lebedevka let suggest, that the nomads could receive some import articles that were brought along the caravan routes leading from Egypt and Syria to the East.

  1. Dimensoes da vulnerabilidade para as familias da crianca com dor oncologica em ambiente hospitalar

    Directory of Open Access Journals (Sweden)

    Maria da Graca Corso da Motta

    2013-09-01

    Full Text Available Identificar aspectos que demonstrem as dimensões da vulnerabilidade no universo familiar na ótica da família de crianças com dor oncológica em ambiente hospitalar Trata-se de um estudo descritivo exploratório com abordagem qualitativa, realizada na Unidade de Hematologia e Oncologia Pediátrica, de um hospital de grande porte da cidade de Porto Alegre - RS. Participaram do estudo nove famílias, utilizando-se para coleta dos dados o Método Criativo Sensível, por meio das dinâmicas de criatividade e sensibilidade, analisadas conforme o referencial da Análise de Conteúdo de Minayo, nos meses de Maio e Junho de 2010 Constatou-se que a doença traz à tona situações de vulnerabilidade, conferindo à criança e à família, sofrimento, dor, medo, angústia, desgaste físico e mental, causados pelo câncer. Assim, a Enfermagem, ao apropriar-se do marco conceitual da vulnerabilidade, pode visualizar novas dimensões do processo saúde/doença auxiliando a criança doente e sua família.

  2. Characterizing a Middle Bronze palatial wine cellar from Tel Kabri, Israel.

    Directory of Open Access Journals (Sweden)

    Andrew J Koh

    Full Text Available Scholars have for generations recognized the importance of wine production, distribution, and consumption in relation to second millennium BC palatial complexes in the Mediterranean and Near East. However, direct archaeological evidence has rarely been offered, despite the prominence of ancient viticulture in administrative clay tablets, visual media, and various forms of documentation. Tartaric and syringic acids, along with evidence for resination, have been identified in ancient ceramics, but until now the archaeological contexts behind these sporadic discoveries had been uneven and vague, precluding definitive conclusions about the nature of ancient viticulture. The situation has now changed. During the 2013 excavation season of the Kabri Archaeological Project, a rare opportunity materialized when forty large storage vessels were found in situ in an enclosed room located to the west of the central courtyard within the Middle Bronze Age Canaanite palace. A comprehensive program of organic residue analysis has now revealed that all of the relatively uniform jars contain evidence for wine. Furthermore, the enclosed context inherent to a singular intact wine cellar presented an unprecedented opportunity for a scientifically intensive study, allowing for the detection of subtle differences in the ingredients or additives within similar wine jars of apparently the same vintage. Additives seem to have included honey, storax resin, terebinth resin, cedar oil, cyperus, juniper, and perhaps even mint, myrtle, or cinnamon, all or most of which are attested in the 18th century BC Mari texts from Mesopotamia and the 15th century BC Ebers Papyrus from Egypt. These additives suggest a sophisticated understanding of the botanical landscape and the pharmacopeic skills necessary to produce a complex beverage that balanced preservation, palatability, and psychoactivity. This new study has resulted in insights unachievable in the past, which contribute to a

  3. Fish remnants from the excavations of the Bronze Age barrow near Maryanskoe village (Dnepropetrovsk region, Ukraine

    Directory of Open Access Journals (Sweden)

    O. M. Kovalchuk

    2014-10-01

    Full Text Available The Bronze Age mound (2.5–2.3 kya BC is located near the Maryanskoe village (Apostolovskyi district, Dnepropetrovsk region and was excavated in 1953. The results of determination of the fish remnants, which were found during the excavation, are presented in the paper. Eleven species belonging to 9 genera, 5 families and 5 orders (Acipenseriformes, Cypriniformes, Siluriformes, Esociformes, Perciformes were identified: russian sturgeon Acipenser gueldenstaedtii Brandt et Ratzeburg, 1833, stellate sturgeon A. stellatus Pallas, 1771, common ide Idus idus (Linnaeus, 1758, common roach Rutilus rutilus (Linnaeus, 1758, pontic roach R. frisii (Nordmann, 1840, common bream Abramis brama (Linnaeus, 1758, common carp Cyprinus carpio Linnaeus, 1758, tench Tinca tinca (Linnaeus, 1758, european catfish Silurus glanis Linnaeus, 1758, northern pike Esox lucius (Linnaeus, 1758, and zander Sander lucioperca (Linnaeus, 1758. Most of them are quite common in the Dnieper river basin. It was found that carp fishes predominate in the number of species. Most of the bone remnants in the collection belong to zander, catfish and pike, while common roach, pontic roach and common bream are identified by the few bones. This may indicate a different role of these species in the diet of the local population. The ratio of skeletal elements in the collection is the evidence of the fish cutting on the site. Body length and weight was reconstructed for 64 fish specimens. It was found that they were mature and small-sized, except for catfish, pike and perch. Taking into account the characteristics of the funeral rituals of the Yamna culture population, fish bones from the mound near Maryanskoe can be remnants of the parting meal.

  4. High-Rate Intercalation without Nanostructuring in Metastable Nb2O5 Bronze Phases.

    Science.gov (United States)

    Griffith, Kent J; Forse, Alexander C; Griffin, John M; Grey, Clare P

    2016-07-20

    Nanostructuring and nanosizing have been widely employed to increase the rate capability in a variety of energy storage materials. While nanoprocessing is required for many materials, we show here that both the capacity and rate performance of low-temperature bronze-phase TT- and T-polymorphs of Nb2O5 are inherent properties of the bulk crystal structure. Their unique "room-and-pillar" NbO6/NbO7 framework structure provides a stable host for lithium intercalation; bond valence sum mapping exposes the degenerate diffusion pathways in the sites (rooms) surrounding the oxygen pillars of this complex structure. Electrochemical analysis of thick films of micrometer-sized, insulating niobia particles indicates that the capacity of the T-phase, measured over a fixed potential window, is limited only by the Ohmic drop up to at least 60C (12.1 A·g(-1)), while the higher temperature (Wadsley-Roth, crystallographic shear structure) H-phase shows high intercalation capacity (>200 mA·h·g(-1)) but only at moderate rates. High-resolution (6/7)Li solid-state nuclear magnetic resonance (NMR) spectroscopy of T-Nb2O5 revealed two distinct spin reservoirs, a small initial rigid population and a majority-component mobile distribution of lithium. Variable-temperature NMR showed lithium dynamics for the majority lithium characterized by very low activation energies of 58(2)-98(1) meV. The fast rate, high density, good gravimetric capacity, excellent capacity retention, and safety features of bulk, insulating Nb2O5 synthesized in a single step at relatively low temperatures suggest that this material not only is structurally and electronically exceptional but merits consideration for a range of further applications. In addition, the realization of high rate performance without nanostructuring in a complex insulating oxide expands the field for battery material exploration beyond conventional strategies and structural motifs. PMID:27264849

  5. Ancient road transport devices: Developments from the Bronze Age to the Roman Empire

    Science.gov (United States)

    Rossi, Cesare; Chondros, Thomas G.; Milidonis, Kypros F.; Savino, Sergio; Russo, Flavio

    2016-03-01

    The development of transportation systems has significantly enhanced the welfare and modernization of society. Wooden vehicles pulled by animals have been used for land transportation since the early Bronze Age. Whole-body gharries with rigid wheels pulled by oxen appeared in Crete by 2000 BC or earlier. Horses originating from the East were depicted in early Cretan seal-rings of the same period. The two-wheeled horsedrawn chariot was one of the most important inventions in history. This vehicle provided humanity its first concept of personal transport and was the key technology of war for 2000 years. Chariots of Mycenaean and Archaic Greece with light and flexible four-spoked wheels acting as spring suspensions were depicted in vase paintings. The development of this vehicle incorporated the seeds of a primitive design activity and was important for engineering. The Trojan horse since 1194 BC and the helepolis since 700 BC were the first known machines on a wheeled base transported by horses or self-powered. Ancient engineers invented bearings lubricated with fat, and Romans introduced the ancestors of ball bearings for their wagons and carts. The historic evolution of wheeled transportation systems, along with early traction, suspension, and braking systems, is presented in this paper. Analytical and numerical methods are incorporated to analyze the most conceivable loading situations of typically reconstructed wheeled transportation systems in ancient times. Traction requirements both for horse-driven machines and the power for internal motors are also analyzed. This study can serve as a basis for further development of detailed reconstruction of transportation systems in antiquity.

  6. Cavitation Erosion Corrosion Behaviour of Manganese-nickel -aluminum Bronze in Comparison with Manganese-brass

    Institute of Scientific and Technical Information of China (English)

    Hong Yu; Yugui Zheng; Zhiming Yao

    2009-01-01

    The cavitation erosion corrosion behaviour of ZQMn 12-8-3-2 manganese-nickel-aluminum bronze and ZHMn55-3-1 manganese-brass was investigated by mass loss, electrochemical measurements (polarization curves and electrochemical impedance spectroscopy) and the cavitation damaged surfaces were observed by scanning electron microscopy (SEM). The results showed that ZQMn 12-8-3-2 had better cavitation erosion resistance than ZHMn55-3-l. After the cavitation erosion for 6 h, the cumulative mass loss of ZQMnl2-8-3-2 was about 1/3 that of ZHMn55-3-l. The corrosion current density of ZQMnl2-8-3-2 was less than that of ZHMn55-3-l under both static and cavitaiton condition. The free-corrosion potentials of ZQMnl2-8-3-2 and ZHMn55-3-l were all shifted in positive direction under cavitation condition compared to static condition. In the total cu-mulative mass loss under cavitation condition, the pure erosion played a key role for the two tested materials (74% for ZHMn55-3-l and 60% for ZQMnl2-8-3-2), and the total synergism between corrosion and erosion of ZQMnl2-8-3-2 (39%) was larger than that of ZHMn55-3-l (23%). The high cavitation erosion resistance of ZQMnl2-8-3-2 was mainly attributed to its lower stacking fault energy (SFE), the higher microhardness and work-hardening ability as well as the favorable propagation of cavitation cracks for ZQMn 12-8-3-2, i.e., parallel to the surface rather than perpendicular to the surface for ZHMn55-3-l.

  7. Characterizing a Middle Bronze palatial wine cellar from Tel Kabri, Israel.

    Science.gov (United States)

    Koh, Andrew J; Yasur-Landau, Assaf; Cline, Eric H

    2014-01-01

    Scholars have for generations recognized the importance of wine production, distribution, and consumption in relation to second millennium BC palatial complexes in the Mediterranean and Near East. However, direct archaeological evidence has rarely been offered, despite the prominence of ancient viticulture in administrative clay tablets, visual media, and various forms of documentation. Tartaric and syringic acids, along with evidence for resination, have been identified in ancient ceramics, but until now the archaeological contexts behind these sporadic discoveries had been uneven and vague, precluding definitive conclusions about the nature of ancient viticulture. The situation has now changed. During the 2013 excavation season of the Kabri Archaeological Project, a rare opportunity materialized when forty large storage vessels were found in situ in an enclosed room located to the west of the central courtyard within the Middle Bronze Age Canaanite palace. A comprehensive program of organic residue analysis has now revealed that all of the relatively uniform jars contain evidence for wine. Furthermore, the enclosed context inherent to a singular intact wine cellar presented an unprecedented opportunity for a scientifically intensive study, allowing for the detection of subtle differences in the ingredients or additives within similar wine jars of apparently the same vintage. Additives seem to have included honey, storax resin, terebinth resin, cedar oil, cyperus, juniper, and perhaps even mint, myrtle, or cinnamon, all or most of which are attested in the 18th century BC Mari texts from Mesopotamia and the 15th century BC Ebers Papyrus from Egypt. These additives suggest a sophisticated understanding of the botanical landscape and the pharmacopeic skills necessary to produce a complex beverage that balanced preservation, palatability, and psychoactivity. This new study has resulted in insights unachievable in the past, which contribute to a greater understanding

  8. Archaeomagnetic Dating of Bronze Age Pottery in Syria: New Intensity Data for 2300 to 1000 BCE

    Science.gov (United States)

    Stillinger, M. D.; Feinberg, J. M.; Frahm, E.

    2013-12-01

    In order to construct meaningful site chronologies, Near Eastern archaeologists have traditionally relied on relative dating techniques, such as ceramic seriation and textual/glyptic evidence. The introduction of radiocarbon dating provided archaeologists with an absolute dating tool to address age discrepancies. However, many sites do not contain sufficient or suitable materials for radiocarbon analysis, requiring the need for an alternative absolute dating tool. Archaeomagnetic dating provides such an alternative. Excavations at Tell Mozan (Bronze-Age Urkesh) in northeastern Syria have revealed evidence for nearly 5000 years of occupation in strata containing a variety of diagnostic ceramic artifacts, which form the basis for a well-established relative site chronology. In order to test the agreement between seriation ages and paleomagnetic-derived ages, archaeointensity experiments were conducted on pottery specimens from six well-stratified occupational layers spanning more than a thousand years of the site's primary occupation. Archaeointensity was determined using the IZZI paleointensity protocol of Tauxe and Staudigel (2004), and all estimates were corrected for remanence anisotropy and cooling rate effects, resulting in an 88% success rate (n = 51). The magnetic mineral assemblage of each sample was also characterized using a comprehensive suite of rock magnetic techniques. Final results were compared with previous archaeointensity studies in the region, and 70% of the magnetically-derived ages agree with the archaeologically-derived dates within a 1σ confidence interval, while 76% agreed within 2σ. Artifacts showing disagreement with the seriation chronology are most likely objects in use long after their original firing or the result of contamination of strata from the re-use of previous occupational materials in construction. One specimen appears to confirm the presence of a geomagnetic spike around 1000 BCE previously identified in Syria, Israel

  9. Marcos da história da radioatividade e tendências atuais Landmarks in the history of radioactivity and current tendencies

    OpenAIRE

    Allan Moreira Xavier; André Gomes de Lima; Camila Rosa Moraes Vigna; Fabíola Manhas Verbi; Gisele Gonçalves Bortoleto; Karen Goraieb; Carol Hollingworth Collins; Maria Izabel Maretti Silveira Bueno

    2007-01-01

    The first days of radioactivity, the discoveries of X-rays, radioactivity, of alpha- and beta- particles and gamma- radiation, of new radioactive elements, of artificial radioactivity, the neutron and positron and nuclear fission are reviewed as well as several adverse historical marks, such as the Manhattan project and some nuclear and radiological accidents. Nuclear energy generation in Brazil and the world, as an alternative to minimize environmental problems, is discussed, as are the medi...

  10. Marcos da história da radioatividade e tendências atuais Landmarks in the history of radioactivity and current tendencies

    Directory of Open Access Journals (Sweden)

    Allan Moreira Xavier

    2007-02-01

    Full Text Available The first days of radioactivity, the discoveries of X-rays, radioactivity, of alpha- and beta- particles and gamma- radiation, of new radioactive elements, of artificial radioactivity, the neutron and positron and nuclear fission are reviewed as well as several adverse historical marks, such as the Manhattan project and some nuclear and radiological accidents. Nuclear energy generation in Brazil and the world, as an alternative to minimize environmental problems, is discussed, as are the medicinal, industrial and food applications of ionizing radiation. The text leads the reader to reflect on the subject and to consider its various aspects with scientific and technological maturity.

  11. A report on the examination of animal skin artefacts from the Bronze Age salt mines of Hallstatt, Austria

    OpenAIRE

    Susanna Harris

    2006-01-01

    My PhD research focuses on the social context of cloth from the Neolithic to Bronze Age with case studies from the Alpine area. One aspect of this is the interrelationship of the technologies used to create flexible, thin sheets of material that can be wrapped, folded, shaped and tied. This includes fibre-based cloth such as textiles, netting and twining as well as animal skins (leather and fur). This short report summarises preliminary research findings stemming from the examination of anima...

  12. Identification of ancient paths within the Late Bronze Age enclosure Corneşti-Iarcuri, western Romania

    Science.gov (United States)

    Nykamp, Moritz; Heeb, Bernhard S.; Hoelzmann, Philipp; Knitter, Daniel; Krause, Jan; Krause, Rüdiger; Szentmiklosi, Alexandru; Schütt, Brigitta

    2016-04-01

    This study applies a landscape archaeological approach, combining geoscientific and archaeological data, to shed light into the Holocene landscape development in the environs of the Late Bronze Age enclosure of Corneşti-Iarcuri, Romania. Corneşti-Iarcuri is located at the eastern edge of the Great Hungarian Plain and represents with its four earth-filled wooden ramparts the largest known prehistoric enclosure in Europe. Late Bronze Age settlements are documented for the two innermost enclosures. However, the settlement history in its environs started already in the Copper Age. The aims of this study are i) to link hydro-morphological relief anomalies to evidences of settlement occurrence and ii) to document the variations of Holocene geomorphic activity and stability in a selected sub-catchment. The spatio-temporal relation between unnaturally bending tributaries and settled areas is uncovered and the involved formation processes are discussed. The morphometric analyses of the tributaries in the built-up area of Iarcuri show a clear tendency: unnaturally bending tributaries most often occur in the central valley and tend to cluster in the central part between the two innermost enclosures. By comparison of the locations of the strongly bending tributaries and the locations of the most densely settled areas it appears that both are related. It is well known that such linear features form in relation to settlements as a consequence of repeated passage of humans. Due to soil compaction along regular footpaths and the resulting reduced infiltration capacity gully erosion tends to occur forming hollow ways. Usually these hollow ways form contemporaneously with or subsequent to the occupation period of the site. As a consequence alluvial fans form at the outlet of the tributaries documenting former settlement and geomorphic activities. A sediment core obtained from the alluvial fan dumped by the tributary sourcing in the densely settled southern part of enclosure II

  13. The crystal chemistry of the tetragonal tungsten-bronze: Ba6FeNb9O30

    International Nuclear Information System (INIS)

    Solid state reaction of BaCO3, FeC2O4 x 2 H2O and Nb2O5 gave single crystals of Ba6FeNb9O30. The crystal strucuture was solved by X-ray investigations (a = 12.597, c = 3.990 Ao, space group P4 bm - C4v2, Z = 1). Ba6FeNb9O30 crystallyzes in the tetragonal bronze type with a statistical distribution of Fe3+ and Nb5+ in the octahedral framework. The anisotropic temperature factors of barium are discussed with respect to the oxygen coordination. (Author)

  14. CONTRIBUTIONS TO THE STUDY OF THE VIBRATIONS FREQUENCY OF THE DRILL TOOL IN THE PROCESS OF MANUFACTURING THE BRONZE MATERIALS

    Directory of Open Access Journals (Sweden)

    Cosmin-Mihai MIRIŢOIU

    2013-05-01

    Full Text Available In this paper we present the experimental testings used to study the vibration of the drill tool, during the drilling of the bronze products. We have used the experimental setup presented in Miriţoiu (2013[1]. In this paper the vibrations are analyzed during the drilling on the universal lathe machines. The main purpose of to find a correlation between the cutting speed and the frequency of the vibration by using the experimental results and the regression analysis

  15. Increasing Mobility at the Neolithic/Bronze Age Transition - sulphur isotope evidence from Öland, Sweden

    OpenAIRE

    Anna Linderholm; Elin Fornander; Gunilla Eriksson; Carl-Magnus Mörth; Kerstin Lidén

    2014-01-01

    The objective of this investigation is to look at the use of various aquatic, in this case marine, resources in relation to mobility during the Neolithic and Bronze Age periods. On the island of Öland, in the Baltic Sea, different archaeological cultures are represented in the form of material culture and skeletal remains at three sites. We have analysed δ34S values in human remains representing 36 individuals, as well as faunal remains. We investigated intra-individual patterns of mobility f...

  16. Experimental determination of stability margin in a 27 strand bronze matrix, Nb3Sn cable-in-conduit conductor

    International Nuclear Information System (INIS)

    A small coil of internally cooled cabled superconductor was fabricated for experimental determination of the stability margin. The conductor is 27 strands of Nb3Sn in a bronze matrix. The sheath material is JBK-75 superalloy. The bifilar coil was potted in epoxy in the annulus of a pulse coil set. Experimental results are presented defining critical pulse energy as a function of normalized operating current and background field. The relationships between dB/dt, pulse energy and stability margin are derived by calculation and confirmed by experimental calibration

  17. Effect of microstructure on the mechanical and corrosion behaviors of a hot-extruded nickel aluminum bronze

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    In this paper,the influence of microstructure on the corrosion behavior of a hotextruded nickel aluminum bronze was studied.Three kinds of samples subjected to the hot-extrusion,annealing and quenching conditions were prepared and immersion tests in 3.5% NaCl solution were carried out.Microstructures and corrosion surface morphologies of the samples were observed by SEM.It was found that the retained β martensite and(α+κⅢ) lamella eutectoid in the as hot-extruded material were eliminated after annealing,and...

  18. Tribolayer Formation on Bronze Cu Sn12Ni2 in the Tribological Contact between Cy linder and Cont rol Plate in an Axial Piston Pump with Swashplate Design

    OpenAIRE

    Paulus, Andreas; Jacobs, Georg

    2016-01-01

    The present study investigates the f ormation of tribolayers on bronze CuSn12Ni2. Two different test rigs are used, of which one is a sliding bearing test rig in order to perform lubricated thrust bearing tests. Bronze CuSn12Ni2 is used for the sliding elements and the counter body is made of C45 steel. In addition to that, an axial piston pump test rig was used to determine t he transfera bility of the results to th e axial pist on pump. The test conditions are set up in a way t hat the trib...

  19. Methodology for the Construction of a Rule-Based Knowledge Base Enabling the Selection of Appropriate Bronze Heat Treatment Parameters Using Rough Sets

    Directory of Open Access Journals (Sweden)

    Górny Z.

    2015-04-01

    Full Text Available Decisions regarding appropriate methods for the heat treatment of bronzes affect the final properties obtained in these materials. This study gives an example of the construction of a knowledge base with application of the rough set theory. Using relevant inference mechanisms, knowledge stored in the rule-based database allows the selection of appropriate heat treatment parameters to achieve the required properties of bronze. The paper presents the methodology and the results of exploratory research. It also discloses the methodology used in the creation of a knowledge base.

  20. MarcoPolo-R: Near Earth Asteroid Sample Return Mission candidate as ESA-M3 class mission

    Science.gov (United States)

    Michel, Patrick; Lara, Luisa-M.; Marty, Bernard; Koschny, Detlef; Barucci, Maria Antonietta; Cheng, Andy; Bohnhardt, Hermann; Brucato, John R.; Dotto, Elisabetta; Ehrenfreund, Pascale; Franchi, Ian A.; Green, Simon F.

    2015-03-01

    MarcoPolo-R is a sample return mission to a primitive Near-Earth Asteroid (NEA) selected in February 2011 for the Assessment Study Phase at ESA in the framework of ESAfs Cosmic Vision 2 program. MarcoPolo-R is a European-led mission with a proposed NASA contribution. MarcoPolo-R takes advantage of three industrial studies completed as part of the previous Marco Polo mission (see ESA/SRE (2009)3). The aim of the new Assessment Study is to reduce the cost of the mission while maintaining its high science level, on the basis of advanced studies and technologies, as well as optimization of the mission. MarcoPolo-R will rendezvous with a unique kind of target, a primitive binary NEA, scientifically characterize it at multiple scales, and return a unique pristine sample to Earth unaltered by the atmospheric entry process or terrestrial weathering. The baseline target of MarcoPolo-R is the primitive binary NEA (175706) 1996 FG3, which offers a very efficient operational and technical mission profile. A binary target also provides enhanced science return: the choice of this target will allow new investigations to be performed more easily compared to a single object, and also enables investigations of the fascinating geology and geophysics of asteroids that are impossible to obtain from a single object. Precise measurements of the mutual orbit and rotation state of both components can be used to probe higher-level harmonics of the gravitational potential, and therefore the internal structure. A unique opportunity is offered to study the dynamical evolution driven by the YORP/Yarkovsky thermal effects. Possible migration of regolith on the primary from poles to equator allows the increasing maturity of asteroidal regolith with time to be expressed as a latitude-dependent trend, with the most-weathered material at the equator matching what is seen in the secondary. MarcoPolo-R will allow us to study the most primitive materials available to investigate early solar system

  1. El plan de regionalización del Estado de Bahia (Brasil): “Los Territorios de Identidad" como marco de aplicación de políticas públicas de fomento del desarrollo regional y de lucha contra la desigualdad (2007-2012)

    OpenAIRE

    Blatt, Nadir

    2014-01-01

    A presente tese doutoral teve como objetivo investigar os critérios que levaram o Governo do Estado da Bahia (Brasil) a definir no seu Planejamento Territorial, 27 Territórios de Identidade, incluídos os 417 municípios, utilizando-os como elementos constitutivos para a formulação de políticas públicas, voltadas para o desenvolvimento local e regional. Os Territórios de Identidade foram criados mediante Decreto nº 12.354, de 25.08.2010, constituindo-os como marco territorial de aplicação para ...

  2. Herschel observations of the Marco Polo-R asteroid 175706 (1996 FG3).

    Science.gov (United States)

    O'Rourke, L.; Barucci, A.; Gònzalez-Garcìa, B.; Dotto, E.; Küppers, M.

    2012-09-01

    Background: The Marco Polo-R mission has been selected for the assessment study phase of the ESA M3 missions. This ESA-led sample return mission to the binary asteroid 1996 FG3 (launch window between 2020 and 2024) is proposed with a design that allows it to fit within the pre-defined cost cap of a M-class mission. The binary nature of the target will allow more precise measurements of mass, gravity, and density than for a single object, as well as additional insights into the geology and geophysics of the system. The asteroid has been classified by Binzel et al. [1] as a C-type. It is considered to be a typical example of a primitive object [2]. Dynamically, this is an Apollo asteroid with semimajor axis a of 1.054 AU, eccentricity e of 0.35, and and inclination i of 1.98 degrees. Measurements of the albedo derived from thermal infrared observations give a value of pV = 0.042 (+0.035 -0.017), and a combined diameter of D = 1.84 (+0.56 -0.47) km [3]. The Herschel observations : The MACH-11 (Measurements of 11 Asteroids & Comets) Programme observed this binary asteroid in two occasions in November of 2012. The observations performed had a duration of 0.6 hours with the asteroid pair moving rapidly at 6'/hr thus making removal of the background quite straightforward. The observations were performed in two observing blocks; the first block consisted of a 2 repetition blue/red map, the second block consisted of a 2 repetition green/red map, with the intention to observe the target at different phase angles. Our Results : Our measurements will serve to update the known radiometric properties for this binary asteroid through their inclusion into a thermophysical model (TPM) [4] which has been validated against a large database of asteroids including targets of other spacecraft mission e.g. Lutetia [5], Itokawa [6]. Using existing sets of published thermal observations (Spitzer, TNG NICS), combined with our Herschel observations, applied within this thermophysical model

  3. European asteroid sample return mission: MarcoPolo-R and its future

    Science.gov (United States)

    Barucci, M.

    2014-07-01

    MarcoPolo-R is a sample return mission study to a primitive Near-Earth Asteroid (NEA) carried out at ESA from 2008 in the framework of ESA's Cosmic Vision (CV) programme, with the objective to answer to the fundamental CV questions ''How does the Solar System work?'' and ''What are the conditions for life and planetary formation?''. The returned material will allow us to study in terrestrial laboratories some of the most primitive materials available to investigate early solar system formation processes, to explore initial stages of habitable planet formation, to identify and characterize the organics and volatiles in a primitive asteroid. In fact, only in the laboratory can instruments with the necessary precision and sensitivity be applied to individual components of the complex mixture of materials that forms an asteroid regolith, to determine their precise chemical and isotopic composition. Such measurements are vital for revealing the evidence of interstellar medium, pre-solar nebula and parent body processes that are retained in primitive asteroidal material, unaltered by atmospheric entry or terrestrial contamination. In addition to addressing these major science goals, the MarcoPolo-R mission study (ESA/SRE (2013)4) also involved innovative European technologies for which ESA technical development programs are still under way. As a result of the several industrial studies, ESA designed a remarkably cost-effective and robust asteroid sample return mission scenario. The spacecraft has been defined making use of low-cost units for most of the sub-systems. The key sample return capabilities, i.e. asteroid navigation, touch and go, sampling mechanism and the re-entry capsule have reached at ESA a validation status to enter implementation phase. In this new era of international effort and interest of sample return with the selected missions of Hayabusa-2 (JAXA) and OSIRIS-Rex (NASA), the development of sample return technology represents in Europe a crucial

  4. Marco Benoît Carbone, Tentacle erotica. Orrore, seduzione, immaginari pornografici

    OpenAIRE

    Luca Zenobi

    2015-01-01

    “Mimesis Media/Eros. Sessualità, tecnologia, rappresentazioni” è la collana diretta da Giovanna Maina e Federico Zecca, due giovani studiosi che, assieme ad Enrico Biasin (Porno espanso, Mimesis, 2011, Porn after Porn, Mimesis International, 2014), hanno avuto il merito di “sdoganare” i porn studies in Italia e, soprattutto, di averlo fatto in una maniera tale da renderli un componente di primo livello del dibattito scientifico, grazie alla collaborazione con studiosi internazionali e a un at...

  5. Review for the volume Alexei Marco. The destiny of a jeweler from Moldova, by Liliana Condraticova, work about the monographic study of the artist jeweler Alexei Marco, within Moldovan cultural space

    Directory of Open Access Journals (Sweden)

    Ana CARAS

    2012-06-01

    Full Text Available The present paper represents the review for the volume Alexei Marco. The destiny of a jeweler from Moldova, by Liliana Condraticova, published at Lumen Publishing House, a volume about the monographic study of an artist jeweler from Moldova. The work comes as a novelty element in the cultural context of Moldova. The lack of studies regarding the life and work of the masters of jewelry manufacturing, determined the author to develop a work in order to provide relevant, comprehensive information, in terms of the artistic creation of the most famous jeweler in Moldova – Alexei Marco. The study uses monographic method, a method used particularly in empirical research, which involves direct observation of territorial social unit without the use of sampling and without manipulating variables. The social reality investigated is approached in all its manifestations.

  6. High-Performance Silver Window Electrodes for Top-Illuminated Organic Photovoltaics Using an Organo-molybdenum Oxide Bronze Interlayer.

    Science.gov (United States)

    Tyler, Martin S; Walker, Marc; Hatton, Ross A

    2016-05-18

    We report an organo-molybdenumn oxide bronze that enables the fabrication of high-performance silver window electrodes for top-illuminated solution processed organic photovoltaics without complicating the process of device fabrication. This hybrid material combines the function of wide-band-gap interlayer for efficient hole extraction with the role of metal electrode seed layer, enabling the fabrication of highly transparent, low-sheet-resistance silver window electrodes. Additionally it is also processed from ethanol, which ensures orthogonality with a large range of solution processed organic semiconductors. The key organic component is the low cost small molecule 3-mercaptopropionic acid, which (i) promotes metal film formation and imparts robustness at low metal thickness, (ii) reduces the contact resistance at the Ag/molybdenumn oxide bronze interface, (iii) and greatly improves the film forming properties. Silver electrodes with a thickness of 8 nm deposited by simple vacuum evaporation onto this hybrid interlayer have a sheet resistance as low as 9.7 Ohms per square and mean transparency ∼80% over the wavelength range 400-900 nm without the aid of an antireflecting layer, which makes them well-matched to the needs of organic photovoltaics and applicable to perovskite photovoltaics. The application of this hybrid material is demonstrated in two types of top-illuminated organic photovoltaic devices.

  7. Increasing Mobility at the Neolithic/Bronze Age Transition - sulphur isotope evidence from Öland, Sweden

    Directory of Open Access Journals (Sweden)

    Anna Linderholm

    2014-11-01

    Full Text Available The objective of this investigation is to look at the use of various aquatic, in this case marine, resources in relation to mobility during the Neolithic and Bronze Age periods. On the island of Öland, in the Baltic Sea, different archaeological cultures are represented in the form of material culture and skeletal remains at three sites. We have analysed δ34S values in human remains representing 36 individuals, as well as faunal remains. We investigated intra-individual patterns of mobility from childhood to adulthood, primarily focusing on a passage grave. Taking into account previously published dietary data that demonstrate a wide range of dietary practices involving aquatic resources, we applied a model to estimate the contribution of δ34S from terrestrial protein, to separate mobility from dietary changes, thereby identifying individuals who changed residence, as well as individuals with non-local origins. Evidence of mobility could be demonstrated at two sites. For the third site the consistently marine diet inhibits inferences on mobility based on δ34S analysis. Chronologically, the frequency of non-locals was highest during the Bronze Age, when the diet was very uniform and based on terrestrial resources.

  8. High-Performance Silver Window Electrodes for Top-Illuminated Organic Photovoltaics Using an Organo-molybdenum Oxide Bronze Interlayer.

    Science.gov (United States)

    Tyler, Martin S; Walker, Marc; Hatton, Ross A

    2016-05-18

    We report an organo-molybdenumn oxide bronze that enables the fabrication of high-performance silver window electrodes for top-illuminated solution processed organic photovoltaics without complicating the process of device fabrication. This hybrid material combines the function of wide-band-gap interlayer for efficient hole extraction with the role of metal electrode seed layer, enabling the fabrication of highly transparent, low-sheet-resistance silver window electrodes. Additionally it is also processed from ethanol, which ensures orthogonality with a large range of solution processed organic semiconductors. The key organic component is the low cost small molecule 3-mercaptopropionic acid, which (i) promotes metal film formation and imparts robustness at low metal thickness, (ii) reduces the contact resistance at the Ag/molybdenumn oxide bronze interface, (iii) and greatly improves the film forming properties. Silver electrodes with a thickness of 8 nm deposited by simple vacuum evaporation onto this hybrid interlayer have a sheet resistance as low as 9.7 Ohms per square and mean transparency ∼80% over the wavelength range 400-900 nm without the aid of an antireflecting layer, which makes them well-matched to the needs of organic photovoltaics and applicable to perovskite photovoltaics. The application of this hybrid material is demonstrated in two types of top-illuminated organic photovoltaic devices. PMID:27135377

  9. Aluminum Bronze Alloys to Improve the System Life of Basic Oxygen and Electric Arc Furnace Hoods, Roofs and Side Vents.

    Energy Technology Data Exchange (ETDEWEB)

    Lawrence C. Boyd Jr.; Dr. Vinod K. Sikka

    2006-12-29

    Energy Industries of Ohio was the lead organization for a consortium that examined the current situation involving the service life of electric arc and basic oxygen furnace hoods, roofs and side vents. Republic Engineered Products (REP), one of the project partners, installed a full-scale Al-Bronze “skirt” in their BOF at their Lorain OH facility, believed to be the first such installation of this alloy in this service. In 24 months of operation, the Al-Bronze skirt has processed a total of 4,563 heats, requiring only 2 shutdowns for maintenance, both related to physical damage to the skirt from operational mishaps. Yearly energy savings related to the REP facility are projected to be ~ 10 billion Btu's with significant additional environmental and productivity benefits. In recognition of the excellent results, this project was selected as the winner of the Ohio’s 2006 Governor’s Award for Excellence in Energy, the state’s award for outstanding achievements in energy efficiency.

  10. Manufacture technique of bronze-iron bimetallic objects found in M27 of Liangdaicun Site, Hancheng, Shaanxi

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    Analysis of the fabrication technology of a bronze knife with an iron blade and a bronze Ge with an iron blade, two copper-iron bimetallic wares, unearthed in M27 of Liangdaicun Site, Hancheng of Shaanxi, is performed in this paper by using metallographic, EPMA and AMS-14C dating methods. The micro-structures of the two samples are typical wrought bloomery iron containing a substantial amount of carbon, which is also called carburized steel, made from bloomery iron by cementation in the solid state. The objects can be dated back to the early Spring and Autumn period. This study provides new evidence for understanding the beginning of iron smelting in China. Most of the early known iron wares of the period between the late Western Zhou Dynasty and the early Spring and Autumn were unearthed in the region at the junction of Henan, Shanxi and Shaanxi, at the middle reaches of the Yellow River, suggesting that this region may likely be one of the earliest centers of iron smelting technology in China and deserves further archaeological research. As early iron products were also discovered in the area of the upper reaches of the Yellow River and in Xinjiang, appropriate attention also should be paid to the relationship between these two areas in terms of the origin of iron smelting.

  11. Health-hazard evaluation report HETA-88-244-1951, Orrville Bronze and Aluminum Company, Orrville, Ohio

    Energy Technology Data Exchange (ETDEWEB)

    Montopoli, M.; Seligman, P.; O' Brien, D.; Zaebst, D.

    1989-03-01

    An investigation was made of possible hazardous working conditions at the Orrville Bronze and Aluminum Company, Orrville, Ohio. Medical screening at the site had recently discovered a worker with a blood lead level in excess of 100 micrograms/deciliter (microg/dl) and seven workers with blood lead levels in excess of 40 microg/dl. The facility was a nonferrous foundry specializing in small- to medium-sized bronze, brass, and copper castings. Lead concentrations in six personal breathing-zone samples ranged from 38 to 520 micrograms/cubic meter (microg/m{sup 3}). Airborne copper levels ranged from 26 to 2601 microg/m{sup 3}. Airborne zinc concentrations ranged from 291 to 3165 microg/m{sup 3}. Three of 18 workers had blood lead levels in excess of 60 microg/m{sup 3}, the OSHA level which requires immediate medical removal protection. The report concludes that lead and copper exposures represented a serious health hazard to workers. Measures to reduce exposures, including engineering controls, work practices, and housekeeping are recommended.

  12. Particle size and kind of mica in synthesis of nontoxic bronze and gold pearlescent pigments based on nanoencapsulated hematite

    Directory of Open Access Journals (Sweden)

    Maryam Hosseini-Zori

    2015-12-01

    Full Text Available Nano-encapsulated iron oxide in Zirconium oxide-coated mica pigments are thermally stable,innocuous to human health, non-combustible, and they do not conduct electricity. They could beapplied in several industries such as thermoplastics, cosmetics, food packaging, children toys, paints,automobiles coating, security purposes, and banknotes. Nowadays, they are highly desirable inceramic decoration. In the present study, intensively dark gold to bronze colored mica clay pigments,which were based on mica flakes covered with a layer of nano-iron oxide-Zirconium oxide particles,were prepared by homogeneous precipitation of iron nitrate and Zirconium chloride ammonia in thepresence of mica flakes in two kinds of ore clay-based phlogopite and muscovite minerals. The finalcolor was obtained by thermal annealing of precipitates at a temperature of 800◦C. The pigments werecharacterized by X-Ray Diffraction, Particle size analysis, Scanning electron microscopy,Transmission electron microscopy, X-Ray fluorescence, and Simultaneous thermal analysis. Resultsindicate that nano-encapsulated iron oxide in zirconia particles have been formed on mica flakes andkinds of clay-mica can be related to obtained shade from dark gold to bronze pearl. Higher particlesize of mica flakes about phlogopite type of mica introduced pearl effects with higher L* changes indifferent angles. Muscovite performed higher hue and better pearl effect than phlogopite.

  13. Habitabilidad educativa de las escuelas. Marco de referencia para el diseño de indicadores

    Directory of Open Access Journals (Sweden)

    Juan Manuel Hernández Vázquez

    2010-01-01

    Full Text Available Este documento propone el concepto de habitabilidad educativa de la escuela (HEE para contribuir a subsanar la falta de un marco conceptual que apoye la reflexión y el desarrollo de indicadores sobre las condiciones en que operan los servicios educativos en países con extensa pobreza como el nuestro. Comprende la revisión de ocho dimensiones cuya pertinencia se argumenta con base en la revisión de bibliografía internacional sobre las temáticas involucradas. Las ocho dimensiones planteadas incluyen: 1 disponibilidad de instalaciones y equipamiento en la escuela; 2 condiciones físicas de instalaciones y equipamiento; 3 confort físico en el aula; 4 espacio educativo; 5 sustentabilidad de la escuela; 6 higiene y seguridad física en la escuela; 7 accesibilidad de la escuela; y 8 disponibilidad de infraestructura y servicios de apoyo en la zona de asentamiento. Se puede consultar una versión ampliada de este trabajo en www.inee.edu.mx, en la que se propone un instrumento aplicable a las escuelas de secundaria para levantar información que no ha sido captada en aplicaciones de la Secretaría de Educación Pública o del propio Instituto Nacional para la Evaluación de la Educación.

  14. La familia en el marco de la justicia transicional: retos y reconocimientos

    Directory of Open Access Journals (Sweden)

    José Fernando Valencia Grajales

    2016-07-01

    Full Text Available Dentro del marco del proceso de paz en Colombia existen una gran cantidad de interrogantes que afectan a la sociedad colombiana, sin embargo uno de los elementos que no han sido tenidos en cuenta de forma directa son los efectos producidos durante los últimos 60 años sobre la configuración de la familia, esta situación será estudiada dentro del proyecto de investigación “familia, victimas y justicia transicional”. Este texto intenta una revisión histórica-holística al concepto de Familia, sus cambios al cabo de la historia, por un lado, luego, compara la familia tradicional cristiana, su conflicto con el mundo moderno, su composición dentro de la modernidad para luego planear dicho concepto y concepción de cara al contexto de violencia política, social y armada que ha vivido Colombia, para cerrar con una reflexión en tono al cómo, estas configuraciones, afectan o no, los abordajes y desarrollos de la posible aplicación de la justicia transicional. 

  15. Evaluación de la sustentabilidad del desarrollo regional. El marco de la agricultura

    Directory of Open Access Journals (Sweden)

    Pablo Torres Lima

    2004-01-01

    Full Text Available La sustentabilidad del desarrollo regional puede evaluarse mediante dife rentes metodologías. Los itinerarios metodológicos para estudiar el papel de la agricultura en el desarrollo sustentable en el ámbito regional proveen de importantes elementos de análisis, tales como las relaciones jerárquicas entre sistemas de producción en el marco de distintos niveles espaciales y temporales. Este trabajo examina los principales enfoques metodológicos e indicadores para evaluar la sust e n t abilidad y presenta una propuesta para el estudio del desarrollo regional desde la sustentabilidad y en el contexto de los sistemas agrícolas. Los principales puntos de este planteamiento son: 1 evaluar las tendencias generales del desarrollo en términos de la economía, el medio ambiente y la sustentabilidad; 2 establecer el perfil regional de evaluación de las actividades agropecuarias con base en indicadores socioeconómicos y agroecológicos; y 3 estudiar el desarrollo y las estrategias económicas de las unidades familiares, su calidad de vida y el medio ambiente local. La formulación de indicadores cualitativos y cuantitativos de sustentabilidad es una etapa fundamental del proceso de investigación sobre el desarrollo regional, principalmente de acuerdo con cuatro criterios:económicos,sociales, político-institucionales y ambientales.

  16. Marco Fabio Quintiliano y la retórica democrática

    Directory of Open Access Journals (Sweden)

    Víctor ALONSO ROCAFORT

    2008-01-01

    Full Text Available Desde finales del siglo veinte estamos asistiendo a un resurgir de la retórica en diversos campos académicos, algo a lo que no resulta ajena la teoría política. Se debe precisar que se habla de diversas retóricas, ya se reivindiquen unos u otros autores, o se haga hincapié en determinados aspectos de la misma. Este trabajo se enmarca en una línea comprometida en revisar fundamentos sustanciales del conocimiento, la filosofía, la ética y la praxis política, en lo que algunos califican ya de retórica democrática. Desde ahí recuperamos a uno de sus grandes autores clásicos, Marco Fabio Quintiliano. Sus propuestas enriquecerán aquellas otras que han ido a contracorriente de las visiones triunfales de la ciencia política moderna, y que desde los años cincuenta ha tenido en autores como Hannah Arendt, Sheldon Wolin, Hans G. Gadamer, Eric Voegelin o Leo Strauss a sus mayores adalides.

  17. Marcos Zapata's "Last Supper": a feast of European religion and Andean culture.

    Science.gov (United States)

    Zendt, Christina

    2010-01-01

    In Marcos Zapata's 1753 painting of the Last Supper in Cuzco, Peru, Christian symbolism is filtered through Andean cultural tradition. Zapata was a late member of the Cuzco School of Painting, a group comprised of few European immigrants and handfuls of mestizo and Indian artists. The painters in Cuzco learned mostly from prints of European paintings, and their style tends to blend local culture into the traditional painting of their conquistadors. Imagery was the most successful tool used by the Spaniards in their quest to Christianize the Andean population. By teaching locals to paint Christian subjects, they were able to infuse Christianity into Andean traditions. Zapata's rendering of the Last Supper utilizes this cultural blending while staying true to the Christian symbolism within the subject. Instead of the traditional lamb, Zapata's Last Supper features a platter of cuy, or guinea pig, an Andean delicacy stocked with protein as well as cultural significance. Cuy was traditionally a sacrificial animal at Inca agricultural festivals and in this way it offers poignant parallel to the lamb, as a traditional Christian sacrificial animal. PMID:21568039

  18. Un marco teórico para la investigación jurídica

    Directory of Open Access Journals (Sweden)

    Silvina Pezzetta

    2011-06-01

    Full Text Available ResumenEl presente trabajo tiene como objetivo la utilización de algunos parámetros epistemológicos para distinguir los tipos de trabajos que producen los estudiosos y estudiosas del derecho. Parto de la idea de que un trabajo que pretenda ser considerado como parte de las ciencias sociales no puede carecer de un marco teórico completo, es decir, con tres niveles de abstracción: paradigma, teoría general y teoría sustantiva. Para conseguir los objetivos propuestos describo algunas características propias del campo de producción jurídica y las dificultades que existen para articular teoría, metodología y objetivos. AbstractThe goal of this article is to apply some epistemological concepts in order to classify the papers produced by law researchers. To do that I assume that every social research needs a complete theoretical framework. Law research can avoid this requirement if the intention is to be considered as a social research work. With the intention of complete the objectives; I describe the particular features of the field of juridical production and the difficulties to articulate theory, methodology and specific objectives.

  19. Competitividad de la administración de las aduanas en el marco del comercio internacional

    Directory of Open Access Journals (Sweden)

    América Ivonne Zamora Torres

    2015-01-01

    Full Text Available El paso por aduanas es un acto obligado para todos aquellos agentes que buscan participar en el comercio exterior. No obstante, el despacho aduanero y todos los actos aduaneros pueden ser procesos desalentadores para quienes incursionan en nuevos mercados. Por lo tanto, resulta fundamental que las aduanas funjan como facilitadores del proceso comercial brindando seguridad y garantizando la entrega oportuna de las mercancías y la reducción de costos del comercio internacional. Ello conlleva la optimización de la logística internacional y la ventaja competitiva de las empresas y naciones en la cadena de valor global (Shujie & Zhao, 2009. Este trabajo evalúa, a través del análisis de componentes principales, la competitividad de las aduanas en el marco del comercio internacional. Para ello, se consideraron las variables más importantes que inciden en la competitividad de las aduanas en veintinueve países. Los resultados se muestran a través del indicador denominado índice de competitividad de las aduanas y señalan que los países más competitivos en materia aduanal —de acuerdo con las variables analizadas y en orden descendente— son Panamá seguido de China, India, Alemania, Corea, Suecia, Singapur, Turquía, Tailandia y Chile.

  20. Un Modelo de Credit Scoring para instituciones de microfinanzas en el marco de Basilea II

    Directory of Open Access Journals (Sweden)

    Salvador Rayo Cantón

    2010-06-01

    Full Text Available El crecimiento de los microcréditos a nivel mundial, junto con la normativa internacional sobre requerimientos de capital (Basilea II, están impulsando a las instituciones de microfinanzas (IMFs a una mayor competencia con las entidades bancarias por este segmento de negocio. La banca tradicionalmente ha contado con adecuados modelos de credit scoring para analizar el riesgo de incumplimiento, pero esto no ha sido así en las IMFs supervisadas. El objetivo de esta investigación es diseñar un modelo de credit scoring para una institución sometida a supervisión y especializada en microcréditos, como es la Entidad de Desarrollo de la Pequeña y Micro Empresa (Edpyme del sistema financiero del Perú. El resultado de la investigación muestra la metodología y fases necesarias para diseñar el modelo, así como el proceso de valoración y validación para que pueda ser aplicado en el área de negocio, especialmente para establecer la política de tasas de interés con clientes. Por último, también se muestra cómo puede utilizarse el modelo para desarrollar una gestión del riesgo de crédito en el marco de los métodos IRB de Basilea II.

  1. ¿Es eficaz el terrorismo? Consideraciones, problemas y marco de investigación futura

    Directory of Open Access Journals (Sweden)

    Richard English

    2016-04-01

    Full Text Available La cuestión de «si es eficaz el terrorismo» es de vital importancia tanto desde el punto de vista práctico como intelectual; no obstante, ha sido ampliamente eclipsada por otras consideraciones desarrolladas dentro de la literatura académica sobre el terrorismo. En este contexto, el presente artículo aborda algunas de las aportaciones recientes al debate emergente relacionado con dicha cuestión; destaca varias de las problemáticas inherentes a la discusión académica con respecto a este tema surgidas hasta la fecha; y, por último, esboza un marco para que la investigación académica futura en esta área tenga un carácter más inclusivo, sistemático y fructífero en el plano dialógico que el que ha tenido hasta la fecha.

  2. Petrography and geochronology of the Sao Jose dos Quatro Marcos granitoids, southwestern Mato Grosso, Brazil

    International Nuclear Information System (INIS)

    An area of about 400Km2 was mapped in the region of Sao Jose dos Quatro Marcos, southwestern State of Mato Grosso, western Brazil. Various granitoid rocks were recognized, intrusive into basement gneisses, and mapped as two distinct units, one of massive late granitoids (mostly 3a and 3b granites) and one of foliated granitoids, with oriented mafic minerals, consisting mainly of tonalites and, to a lesser degree, of granodiorites. The sequence of intrusion is from tonalites to granodiorites to late granites. Magmatic textures are usually preserved in the rocks, with the exception of some clearly recrystallized samples. Field aspects, as well as petrography and mineralogy, suggest a genetic relationship between the various granitoid types, showing overall features commonly cited as typical of 'I' lineages. A Rb/Sr whole-rock isochron obtained from 3b granites (six points) shows an age of 1,472 +- 19 Ma, and Sr8786 initial ratio of 0.7037 +- 0.0004; a nine point isochron (adding two tonalites and one granodiorite) yelds similar results (age of 1,505 +- 20 Ma, initial ratio of 0.7029+- 0.0003). The obtained ages confirm the existence of a thermal-magmatic event at about 1,500 Ma at the southern border of the Amazon Craton. (author)

  3. The Silk Road, Marco Polo, a Bible and its proteome: a detective story.

    Science.gov (United States)

    Toniolo, Lucia; D'Amato, Alfonsina; Saccenti, Riccardo; Gulotta, Davide; Righetti, Pier Giorgio

    2012-06-18

    Around the end of XIII century (at the time of young Marco Polo's first trip to China at the court of Khubilai Khan in Khan Baliq) a pocket Bible was delivered by a Franciscan friar to the Mogul Emperor, in the framework of the evangelization program of the Far East. Four centuries later, in 1685, this Bible was rediscovered by the Jesuit Philippe Couplet in the house of a rich Chinese in Nanchin and donated to Cosimo III, Grand Duke of Tuscany. This Bible was recently "unearthed" in the Biblioteca Medicea Laurenziana in Florence, wrapped up in a precious yellow silk cloth, in a rather ruined state. After two years of restoration, the Bible will return to China in 2012 for a celebration of its >700years of life and of its remarkable return trip on the Silk Road. On account of the thinness of the parchment (barely 80μm thickness, the size of each foil being 16.5×11cm) it was widely held that the pages were produced from foetal lambskins. On tiny fragments of the margins of a foil, after several unsuccessful attempts at digesting the vellum, we were able to obtain a tryptic peptide mixture, which, upon mass spectrometry analysis, yielded the identity of 8 unique proteins, belonging to the genus Bos taurus, thus confirming the origin of the vellum from calfskins rather than from foetal lambskins. Our results prove that it is possible to obtain reliable protein extraction and IDs from ancient parchment documents.

  4. Los marcos de acción colectiva compartidos que legitiman las luchas contra la precariedad laboral de una red de activismo autónoma

    OpenAIRE

    Pinto Mascareño, Raquel Mercedes

    2010-01-01

    En este trabajo revisamos los enfoques Clásicos y las teorías de la Movilización de Recursos, de los Nuevos Movimientos Sociales y la actual perspectiva Socioconstruccionista de los ‘marcos de acción colectiva’. Son escasas, sin embargo, las investigaciones que analizan el sentido y la naturaleza compartida de los marcos, como concebidos por Gamson (1992) y Klandermans (1997). Analizamos, por tanto, estos aspectos de los marcos de acción colectiva presentes en documentos y entrevistas con act...

  5. Regional models of metal production in Western Asia in the Chalcolithic, Early and Middle Bronze Ages

    Directory of Open Access Journals (Sweden)

    Avilova, Liudmila

    2008-06-01

    Full Text Available The objective of this work is the reconstruction and comparative analysis of regional models of metal production in the Chalcolithic, Early and Middle Bronze Ages. The work is based on the statistical analysis of unique computer database on archaeological metal finds from four regions of the Near East: Anatolia, Mesopotamia, the Levant, and Iran. The materials are analysed by four indicators: distribution by the chronological periods, artefacts’ function, proportion of used metals and copper- based alloys. The author presents a series of conclusions concerning the preconditions for the beginnings of metal production in Western Asia and the pioneering role of Iran in its emergence, the important role the piedmont territories played in the development of metal production, the leap-like pattern of production dynamics shown by the periods, and its relation to the spread of a producing economy, long-distance exchange, and the emergence of the early civilizations.

    El objetivo de este trabajo es la reconstrucción y análisis comparativo de modelos regionales de producción metalúrgica del Calcolítico y la Edad del Bronce Inicial y Media. Se basa en el análisis estadístico de una base de datos única sobre hallazgos metálicos de cuatro regiones del Próximo Oriente: Anatolia, Mesopotamia, el Levante e Irán. Los materiales se analizan atendiendo a cuatro variables: períodos cronológicos, función de los artefactos, proporción de los metales usados y las distintas aleaciones del cobre. La autora aporta una serie de conclusiones respecto a las precondiciones para los inicios de la producción metalúrgica en el Oeste Asiático; sobre el papel pionero de Irán en su aparición; la importancia de los piedemontes en su desarrollo; el patrón no continuo que se observa en las dinámicas de producción por periodos; y su relación con la expansión de la economía de producción, el intercambio a larga distancia y la aparición de las

  6. Entre los marcos jurídicos y las cartografías indígenas

    OpenAIRE

    Caballero Arias, Hortensia

    2016-01-01

    Este trabajo plantea explorar la dimensión política de las demandas territoriales indígenas y discutir los procesos de demarcación de tierras y las cartografías indígenas en relación con los marcos jurídicos nacionales y la noción de soberanía nacional en Venezuela. En primer lugar, presentaremos un contexto general de las luchas y estrategias heurísticas de disputa territorial por parte de los indígenas en América Latina en defensa de la Pachamama. Luego discutiremos los marcos jurídicos vig...

  7. EL PROYECTO DE INVESTIGACIÓN. ETNOGRÁFICA EN EL AULA MARCO TEÓRICO-OPERATIVO

    Directory of Open Access Journals (Sweden)

    Jorge Bojacá Acosta

    2005-01-01

    Full Text Available El presente estudio enfoca tanto el aspecto teórico como el metodológico en una investigación etnográfica dentro del contexto educativo. El estudio se divide en dos partes: en la primera se aborda el marco teórico desde el punto de vista de la antropología, de la antropología cultural, de la etnología y de la etnografía hasta llegar a la investigación educativa-etnográfica; en la segunda se aborda el tema desde el marco operativo con énfasis en lo epistemológico de las herramientas usadas en la investigación etnográfica educativa.

  8. Effect of two-stage isothermal annealing on microstructure CuAl10Fe5Ni5 bronze with additions of Si, Cr, Mo, W and C

    Directory of Open Access Journals (Sweden)

    B. P. Pisarek

    2011-07-01

    Full Text Available The aim of this study was to investigate the effect of a two-step isothermal annealing respectively at 1000 ̊C for 30 min, then at the range of 900÷450 ̊C increments 50 ̊C on the microstructure CuAl10 Ni5Fe5 bronze with additions of Si, Cr, Mo, W and C, cast into sand moulds. The study concerned the newly developed species, bronze, aluminium-iron-nickel with additions of Si, Cr, Mo, W and C. In order to determine the time and temperature for the characteristic of phase transitions that occur during heat treatment of the test method was used thermal and derivation analysis (TDA. The study was conducted on cylindrical test castings cast in the mould of moulding sand. It was affirmed that one the method TDA can appoint characteristic for phase transformations points about co-ordinates: τ (s, t ( ̊ C, and to plot out curves TTT for the studied bronze with their use. It was also found that there is a fiveisothermalannealingtemperatureranges significantly altering the microstructure of examined bronze.

  9. Robust date for the Bronze Age Avellino eruption (Somma-Vesuvius) : 3945 +/- 10 calBP (1995 +/- 10 calBC)

    NARCIS (Netherlands)

    Sevink, Jan; van Bergen, Manfred J.; van der Plicht, Johannes; Feiken, Hendrik; Anastasia, Carmela; Huizinga, Annika; Maroto, Julià; Vaquero, Manuel; Arrizabalaga, Álvaro; Baena, Javier; Baquedano, Enrique; Jordá, Jesús; Julià, Ramon; Montes, Ramón; Rasines, Pedro; Wood, Rachel; Walsma, A.

    2011-01-01

    We found Bronze Age lake sediments from the Agro Pontino graben (Central Italy) to contain a thin (2-3 cm) continuous tephra layer composed of lithics, crystals and minor volcanic glass. Tephrochronological and compositional constraints strongly suggest that this layer represents the Avellino pumice

  10. Quantitative Analysis of the Combined Funeral Bronze Vessels from Zhou Tombs%两周墓葬青铜容器随葬组合定量分析

    Institute of Scientific and Technical Information of China (English)

    吴十洲

    2001-01-01

    The present paper makes a quantitative analysis of the combined bronze vessels from Zhou tombs by means of the mathematical statistical method. The work is based mainly on the archaeo-logical data related to the date and size (area of tomb-chambers) of the Zhou tombs, the cultural regionto which the Zhou tombs belong, and the tomb-owners' status known from inscriptions in the Zhou tombsthemselves, taking this information as marks for grouping (independent variables) . On the basis ofstatistics by the group, calculations of variable data are carried out to find out the number of the dingtripods used in different groups of tombs, that of the combinations of ding with other bronze vessels, andthat of the combinations of practical vessels with specially-made funeral ones (functions) . Through thisanalysis important data have been obtained as to the movement of the variables related to the combinationof funeral bronze vessels in Zhou tombs. As a result, it has been understood whether there is any relationbetween the nature of tombs and the combination of funeral bronze vessels in the movement of valuablesand what degree this relationship stands at.

  11. A unique late bronze age copper fish-hook from Bet Dwarka Island, Gujarat, west coast of India: Evidence on the advance fishing technology in ancient India

    Digital Repository Service at National Institute of Oceanography (India)

    Gaur, A.S.; Sundaresh

    correspondence. e - mail: jprao2001@hotmail.com A unique Late Bronze Age copper fish - hook from Bet Dwarka Island, Gujarat, west coast of India: Evidence on the advance fis h ing technology in ancient India There are numerous evidences of the e...

  12. Genetic diversity in population of largemouth bronze gudgeon (Coreius guichenoti Sauvage et Dabry) from Yangtze River determined by microsatellite DNA analysis.

    Science.gov (United States)

    Zhang, Futie; Tan, Deqing

    2010-01-01

    Largemouth bronze gudgeon (Coreius guichenoti Sauvage et Dabry 1874), one of the endemic fish species in the upper reaches of the Yangtze River in China, is a benthic and potamodromous fish that is typically found in rivers with torrential flow. Three dams in the Yangtze River, Ertan Dam, Three Gorges Dam and Gezhouba Dam, may have had vital impacts on the habitat and spawning behaviors of largemouth bronze gudgeon, and could ultimately threaten the survival of this fish. We studied the population genetic diversity of C. guichenoti samples collected at seven sites (JH, GLP, BX, HJ, MD, SDP and XB) within the Yangtze River and one of its tributaries, the Yalong River. Genetic diversity patterns were determined by analyzing genetic data from 11 polymorphic microsatellite loci. A high genetic diversity among these largemouth bronze gudgeon populations was indicated by the number of microsatellite alleles (A) and the expected heterozygosity (HE). No significant population variation occurred among GLP, BX, HJ and MD populations, but dramatic population differentiation was observed among JH and XB, two dam-blocked populations, versus other populations. Tests for bottlenecks did not indicate recent dramatic population declines and concurrent losses of genetic diversity in any largemouth bronze gudgeon populations. To the contrary, we found that dams accelerated the population differentiation of this fish. PMID:21317547

  13. Latin American Political Outsiders, Revisited: The Case of Marco Enríquez-Ominami in Chile, 2009

    OpenAIRE

    Kenneth Bunker; London School of Economics and Political Science; Patricio Navia; Universidad Diego Portales in Santiago

    2013-01-01

    This article applies the debate on the recent emergence of outsider candidates in Latin America to independent presidential candidate Marco Enríquez-Ominami (ME-O) in Chile in 2009. We test five competing hypotheses to explain his electoral success. First, his support is explained by the consolidation of democracy, reflected by the disposition of voters to disregard the authoritarian/democratic-aligned candidates. Second, his support is explained by the decline of ideological identification, ...

  14. Envejecimiento activo: un marco político en respuesta a la revolución de la longevidad

    OpenAIRE

    Abellán García, Antonio

    2015-01-01

    Envejecimiento activo no sólo es un concepto sino sobre todo una herramienta o un marco de referencia para el diseño de políticas dirigidas a los individuos y a los grupos de población. El concepto captura una visión positiva y completa del envejecimiento como una aspiración individual y como un objetivo político.

  15. The influence of wall thickness on the microstructure of bronze BA1055 with the additions of Si, Cr, Mo and/or W

    Directory of Open Access Journals (Sweden)

    B.P. Pisarek

    2008-12-01

    Full Text Available Aluminium bronzes belong to the high-grade constructional materials applied on the put under strongly load pieces of machines, about good sliding, resistant properties on corrosion both in the cast state how and after the thermal processing. It moves to them Cr and Si in the aim of the improvement of their usable proprieties. Additions Mo and/or W were not applied so far in the larger concentration, these elements were introduced to the melts of the copper as the components of modifiers. It was worked out therefore the new kind of bronzes casting including these elements. Make additions to the Cu-Al-Fe-Ni bronze of Si, Cr, Mo and/or W in the rise of these properties makes possible. The investigations of the influence of the wall thickness of the cast on size of crystallites were conducted: the primary phase β and intermetallic phase κ and the width separates of the secondary phase α precipitate at phase boundary. It results from conducted investigations, that in the aluminium bronze BA1055 after simultaneous makes additions Si, Cr, Mo and in the primary phase β it undergoes considerable reducing size. The addition W reduce size of the grain phase β in the thin walls of the cast 3-6 mm, and addition Cr in the range of the thickness of the wall of the cast 3-6 mm it favors to reducing size the phase β, in walls 12-25 mm the growth causes it. The addition Mo does not influence the change of the size of the grain of the β phase significantly. The make addition singly or simultaneously of the Cr, Mo and W to the bronze CuAl10Fe5Ni5Si it influences the decrease of the quantity separates of the phase α on the interface boundary and of width it separates independently from the thickness of the wall of the cast. The simultaneous make addition of the Si, Cr, Mo and W it enlarges the surface of the phase κFe, κMo. The make addition to the bronze CuAl10Fe5Ni5Si of the Cr, Mo or W the quantity of crystallizing hard phase κ enlarges and the

  16. Abundance, distribution and conservation status of Siberian ibex, Marco Polo and Blue sheep in Karakoram-Pamir mountain area

    Directory of Open Access Journals (Sweden)

    Babar Khan

    2016-07-01

    Full Text Available This study was carried out to investigate abundance, distribution, structure and conservation status of three major ungulate species viz., Capra sibirica, Pseudois nayaur and Ovis ammon polii, in the Karakoram-Pamir mountain area between China and Pakistan. Results showed that the entire study area had a scattered but worthwhile population of Siberian ibex, Blue sheep and Marco Polo sheep, except Khunjerab Pass, Koksil-Pateshek and Barkhun areas of Khunjerab National Park (KNP. Large groups of Blue sheep were sighted in Shimshal and Barkhun valleys (KNP but it did not show up in the Muztagh part of Taxkorgan Nature Reserve (TNR in China. Despite scarcity of natural vegetation and extreme climate, estimated abundance of ibex and Marco Polo sheep was not different from that in Protected Areas of Nepal, China, and India, except for Blue sheep. Marco Polo sheep, Blue sheep and Snow leopard roam across international borders among China, Pakistan and other adjacent countries. Illegal hunting and poaching, removal of natural vegetation for fodder and firewood, and over grazing of pastures by livestock were main habitat issues whereas, border fencing for security reasons, has been a major impediment restricting free movement of the wildlife across international borders. A science based conservation and development strategy is proposed to restore viable wildlife populations and maintain ecological flows of Karakoram Pamir Mountains to benefit both the wild species and the local human communities.

  17. 河南偃师市二里头遗址发现一件青铜钺%A Bronze Yue Battle-axe Discovered on the Erlitou Site in Yanshi City, Henan

    Institute of Scientific and Technical Information of China (English)

    中国社会科学院考古研究所二里头工作队

    2002-01-01

    A bronze yue battle-axe was picked up in Area Ⅲ of the Erlitou site in June 2000.It has a rectangular plan and seems to come from a tomb.Judging from the shape and the style of decoration,it must be of the late Erlitou culture.This is the earliest among the Chinese bronze yue so far discovered.Metallographical examination and composition analysis reveals that it is made of bronze with low tin content and cast in a double mould.X-ray photography shows insufficient in the compactness of its body structure and other defects,which resulted from a certain primitiveness of its casting technology.

  18. Final report of the key comparison CCQM-K98: Pb isotope amount ratios in bronze

    Science.gov (United States)

    Vogl, Jochen; Yim, Yong-Hyeon; Lee, Kyoung-Seok; Goenaga-Infante, Heidi; Malinowskiy, Dmitriy; Ren, Tongxiang; Wang, Jun; Vocke, Robert D., Jr.; Murphy, Karen; Nonose, Naoko; Rienitz, Olaf; Noordmann, Janine; Näykki, Teemu; Sara-Aho, Timo; Ari, Betül; Cankur, Oktay

    2014-01-01

    Isotope amount ratios are proving useful in an ever increasing array of applications that range from studies unravelling transport processes, to pinpointing the provenance of specific samples as well as trace element quantification by using isotope dilution mass spectrometry (IDMS). These expanding applications encompass fields as diverse as archaeology, food chemistry, forensic science, geochemistry, medicine and metrology. However, to be effective tools, the isotope ratio data must be reliable and traceable to enable the comparability of measurement results. The importance of traceability and comparability in isotope ratio analysis has already been recognized by the Inorganic Analysis Working Group (IAWG) within the CCQM. While the requirements for isotope ratio accuracy and precision in the case of IDMS are generally quite modest, 'absolute' Pb isotope ratio measurements for geochemical applications as well as forensic provenance studies require Pb isotope ratio measurements of the highest quality. To support present and future CMCs on isotope ratio determinations, a key comparison was urgently needed and therefore initiated at the IAWG meeting in Paris in April 2011. The analytical task within such a comparison was decided to be the measurement of Pb isotope amount ratios in water and bronze. Measuring Pb isotope amount ratios in an aqueous Pb solution tested the ability of analysts to correct for any instrumental effects on the measured ratios, while the measurement of Pb isotope amount ratios in a metal matrix sample provided a real world test of the whole chemical and instrumental procedure. A suitable bronze material with a Pb mass fraction between 10 and 100 mg•kg-1 and a high purity solution of Pb with a mass fraction of approximately 100 mg•kg-1 was available at the pilot laboratory (BAM), both offering a natural-like Pb isotopic composition. The mandatory measurands, the isotope amount ratios n(206Pb)/n(204Pb), n(207Pb)/n(204Pb) and n(208Pb)/n(204Pb

  19. Marco Benoît Carbone, Tentacle erotica. Orrore, seduzione, immaginari pornografici

    Directory of Open Access Journals (Sweden)

    Luca Zenobi

    2015-05-01

    Full Text Available “Mimesis Media/Eros. Sessualità, tecnologia, rappresentazioni” è la collana diretta da Giovanna Maina e Federico Zecca, due giovani studiosi che, assieme ad Enrico Biasin (Porno espanso, Mimesis, 2011, Porn after Porn, Mimesis International, 2014, hanno avuto il merito di “sdoganare” i porn studies in Italia e, soprattutto, di averlo fatto in una maniera tale da renderli un componente di primo livello del dibattito scientifico, grazie alla collaborazione con studiosi internazionali e a un attento e competente lavoro su categorie che fanno parte oramai da qualche anno del panorama culturale contemporaneo. I workshop sulla pornografia organizzati all’interno delle attività del FilmForum di Udine e Gorizia sono parte integrante e creativa di un laboratorio che in breve tempo ha scalfito le rigide barriere disciplinari dell’accademia italiana coinvolgendo studiosi di discipline e campi diversi.

  20. Specific corrosion product on interior surface of a bronze wine vessel with loop-handle and its growth mechanism, Shang Dynasty, China

    Energy Technology Data Exchange (ETDEWEB)

    Li Yang; Bao Zhirong; Wu Taotao [School of Physics and Technology, Center for Electron Microscopy and MOE Key Laboratory of Artificial Micro- and Nano-structures, Wuhan University, Wuhan 430072 (China); Jiang, Junchun [Xiaogan Museum, Xiaogan 432000 (China); Chen Guantao [Center for Archaeometry, Wuhan University, Wuhan 430072 (China); Pan Chunxu, E-mail: cxpan@whu.edu.cn [School of Physics and Technology, Center for Electron Microscopy and MOE Key Laboratory of Artificial Micro- and Nano-structures, Wuhan University, Wuhan 430072 (China); Center for Archaeometry, Wuhan University, Wuhan 430072 (China)

    2012-06-15

    In this paper, a kind of specific stalactitic product was found on the interior surface of a covered bronze wine vessel with loop-handle (Chinese name is you), which was fabricated in Shang Dynasty (1700 B.C.-1100 B.C.) and now is collected in Xiaogan Museum, Hubei province of China. The microstructures of the product were characterized systematically by using optical microscopy, scanning electron microscope, transmission electron microscope, X-ray diffraction, and Raman microscopy. The experimental results revealed that the product belonged to a kind of malachite with high purity and high crystallinity. The growth of the product was considered to be a possible reason that the vessel was overly airtight within a museum display cabinet besides a lid of the vessel, which made the excess of H{sub 2}O and CO{sub 2} gas concentrations inside the vessel during long-term storage. This corrosion product is very harmful to bronze cultural relics, because of a large amount of copper consumption from the matrix which will reduce its life. The growth mechanism of the specific stalactitic product and the suggestions for preservation of the similar bronze relics in museum were proposed. - Highlights: Black-Right-Pointing-Pointer The stalactitic product was the high purity and good crystallinity malachite. Black-Right-Pointing-Pointer Its growth was related to the excess of H{sub 2}O and CO{sub 2} gas concentrations in museum. Black-Right-Pointing-Pointer It is harmful to the bronzes, because copper will be consumed from the matrix. Black-Right-Pointing-Pointer The suggestions for preservation of the similar bronzes in museum were proposed.

  1. Specific corrosion product on interior surface of a bronze wine vessel with loop-handle and its growth mechanism, Shang Dynasty, China

    International Nuclear Information System (INIS)

    In this paper, a kind of specific stalactitic product was found on the interior surface of a covered bronze wine vessel with loop-handle (Chinese name is you), which was fabricated in Shang Dynasty (1700 B.C.–1100 B.C.) and now is collected in Xiaogan Museum, Hubei province of China. The microstructures of the product were characterized systematically by using optical microscopy, scanning electron microscope, transmission electron microscope, X-ray diffraction, and Raman microscopy. The experimental results revealed that the product belonged to a kind of malachite with high purity and high crystallinity. The growth of the product was considered to be a possible reason that the vessel was overly airtight within a museum display cabinet besides a lid of the vessel, which made the excess of H2O and CO2 gas concentrations inside the vessel during long-term storage. This corrosion product is very harmful to bronze cultural relics, because of a large amount of copper consumption from the matrix which will reduce its life. The growth mechanism of the specific stalactitic product and the suggestions for preservation of the similar bronze relics in museum were proposed. - Highlights: ► The stalactitic product was the high purity and good crystallinity malachite. ► Its growth was related to the excess of H2O and CO2 gas concentrations in museum. ► It is harmful to the bronzes, because copper will be consumed from the matrix. ► The suggestions for preservation of the similar bronzes in museum were proposed.

  2. A brief analysis of the development of bronze yan's structure and shape%简述青铜形制的时代发展

    Institute of Scientific and Technical Information of China (English)

    胡纬; 解洪兴

    2015-01-01

    青铜器为我国古代重要的礼器,每个时期都有不同的特点。青铜是我国古代重要的炊食器。其在各个时代的造型、特征纹饰都有那个时代的特征。通过对各个时期青铜实物的分析与研究,探究其内在的含义,对其纹饰,造型以及其作为礼器的地位的上升与下降,对我们来分析青铜作为礼器在我国古代社会的重要地位及了解青铜的时代特征,具有十分重要的意义。%As a most important kind of ritual vessel in ancient China,bronze ware has different features in different period in history.The bronze Yan is a important kind of kitchen ware in ancient times, which possess the features of mould and sculpture in the corresponding time.The analysis and research into the bronze Yan in kind of every period, the exploration of bronze Yan’s inherent meaning, and the study of its sculpture,mould as well as the change its position are of great significance for us to analyze the important position and comprehend the characteristics of the times of bronze Yan in ancient China.

  3. Apport de l'analyse statistique de la composition des produits de corrosion à la compréhension des processus de dégradation des bronzes archéologiques (Contribution of statistical analysis of corrosion products to the understanding of the degradation processes of archaeological bronzes)

    OpenAIRE

    Robbiola, Luc; Fiaud, Christian

    1992-01-01

    L'analyse élémentaire des composés de corrosion de trois bronzes monophasés, représentatifs d'un corpus d'objets de l'Age du Bronze, a été effectuée par microanalyse X sur microscope électronique à balayage. Les varations de teneurs en principaux éléments chimiques dans les couches de corrosion ont été caractérisés. Un modèle de formation des deux principales structures de corrosion des bronzes archéologiques enfouis est proposé. La dissolution sélective du cuivre de l'alliage peut être contr...

  4. Plan de las Mujeres: marco conceptual y metodología para el Buen Vivir

    Directory of Open Access Journals (Sweden)

    Julieta Paredes

    2011-01-01

    Full Text Available This article analyzes the impact that neoliberal policies have on women and sets out the epistemological fracture that communitarian feminism produces in Western feminism.  We discuss the circumstances in which, for the first time in the history of Bolivian public policies for women, a Plan de las Mujeres emerges from within women’s social organizations. This article also offers the conceptual frame that guides such a Plan, which relies on five categories or fields of direct action that help us in defending ourselves from a market that has put our very lives on sale. These categories are our bodies, our space, our time, our memory, and the movements that we are able to articulate.Este trabajo analiza el impacto de las políticas neoliberales en la vida de las mujeres y expone el rompimiento epistemológico que el feminismo comunitario produce en el feminismo occidental.  Se discuten las circunstancias en las que, por primera vez en la historia de las políticas públicas para las mujeres en Bolivia, surge un Plan desde la base y las experiencias de las organizaciones sociales de mujeres.  El trabajo presenta el marco conceptual que orienta este Plan de las Mujeres y que descansa en cinco categorías o campos de acción directa que nos ayudan a defendernos de un mercado que puso en venta nuestras propias vidas.  Estas categorías son: nuestros cuerpos, nuestro espacio, nuestro tiempo, nuestra memoria y los movimientos que articulamos.

  5. Marco epistemológico de la enfermería

    Directory of Open Access Journals (Sweden)

    María Mercedes Durán de Villalobos

    2002-01-01

    Full Text Available El marco epistemológico de la enfermería pretende mostrar, de manera panorámica, la evolución del conocimiento de la enfermería. En primera instancia, se parte de una clarificación del significado de disciplina profesional y de los componentes de la disciplina: perspectiva, dominio, definiciones y conceptos y patrones del conocimiento. A partir de la definición de la disciplina de la enfermería como “el estudio del cuidado de la experiencia o vivencia de la salud humana”, se analiza su inmersión en los paradigmas alternos de la ciencia y se definen las visiones (paradigmas propias de la disciplina. Asimismo, se comparan dentro de este contexto los elementos disciplinares y de la práctica, de acuerdo con la jerarquía estructural del conocimiento. Para aclarar las expresiones del conocimiento de la enfermería, se analizan los patrones de conocimiento de Carper: empírico, ético, personal y estético. La segunda parte del artículo explica la necesidad de la relación de la teoría, la práctica y la investigación, como base fundamental del desarrollo de la práctica, y se discuten los tipos de teoría que se trabajan en enfermería, para, finalmente, detenerse en la teoría de mediano rango, o rango medio, y analizar su utilidad para la práctica y la investigación. Al final se muestra un cuadro, tomado de Liehr y Smith, en donde se muestran las teorías de rango medio de la enfermería y sus posibilidades de aplicación práctica.

  6. La cooperación judicial en materia penal en el marco del espacio de libertad, seguridad y justicia de la Unión Europea

    OpenAIRE

    Maeso Bernarás, Iñigo Andoni

    2016-01-01

    Perspectiva general de la situación actual de la cooperación judicial penal en el marco del ELSJ. Se pretende orecer un mapa normativo a nivel comunitario como estatal. Especial mención a la Orden Europea de detención y entrega (Euroorden). Análisis del marco institucional de apoyo a la cooperación judicial penal.

  7. Cyberbulling and otherness at scholl: A study in social representations with students from São José dos Quatro Marcos, Mato Grosso.

    OpenAIRE

    C. H. M. Barbosa

    2014-01-01

    This article born from project entitled "The multiple faces of the violence at school" developed by the Interdisciplinary Nucleus of Research in Education and Society (NIPES), from Quatro Marcos College, Mato Grosso. The aim of this research was to approach of social representations of bullying and cyberbullying and discuss, thus, the impasses for the construction of otherness, among adolescents, students from public schools from São José dos Quatro Marcos, Mato Grosso. The empirical material...

  8. ¿Nuevos modelos, viejos esquemas? El chino y la didáctica de lenguas extranjeras en el marco de convergencia europea

    OpenAIRE

    Casas-Tost, Helena; Rovira-Esteva, Sara

    2009-01-01

    El objetivo de esta presentación es analizar cómo se han llevado a cabo las diferentes aplicaciones del Marco común europeo de referencia para las lenguas al chino en el contexto español. Se hace un repaso de las experiencias previas de aplicación de marcos o modelos supuestamente universales al chino, se presentan los problemas detectados y una serie de propuestas de mejora.

  9. Early atmospheric metal pollution provides evidence for Chalcolithic/Bronze Age mining and metallurgy in Southwestern Europe.

    Science.gov (United States)

    Martínez Cortizas, Antonio; López-Merino, Lourdes; Bindler, Richard; Mighall, Tim; Kylander, Malin E

    2016-03-01

    Although archaeological research suggests that mining/metallurgy already started in the Chalcolithic (3rd millennium BC), the earliest atmospheric metal pollution in SW Europe has thus far been dated to ~3500-3200 cal.yr. BP in paleo-environmental archives. A low intensity, non-extensive mining/metallurgy and the lack of appropriately located archives may be responsible for this mismatch. We have analysed the older section (>2100 cal.yr. BP) of a peat record from La Molina (Asturias, Spain), a mire located in the proximity (35-100 km) of mines which were exploited in the Chalcolithic/Bronze Age, with the aim of assessing evidence of this early mining/metallurgy. Analyses included the determination of C as a proxy for organic matter content, lithogenic elements (Si, Al, Ti) as markers of mineral matter, and trace metals (Cr, Cu, Zn, Pb) and stable Pb isotopes as tracers of atmospheric metal pollution. From ~8000 to ~4980 cal.yr. BP the Pb composition is similar to that of the underlying sediments (Pb 15 ± 4 μg g(-1); (206)Pb/(207)Pb 1.204 ± 0.002). A sustained period of low (206)Pb/(207)Pb ratios occurred from ~4980 to ~2470 cal.yr. BP, which can be divided into four phases: Chalcolithic (~4980-3700 cal.yr. BP), (206)Pb/(207)Pb ratios decline to 1.175 and Pb/Al ratios increase; Early Bronze Age (~3700-3500 cal.yr. BP), (206)Pb/(207)Pb increase to 1.192 and metal/Al ratios remain stable; Late Bronze Age (~3500-2800 cal.yr. BP), (206)Pb/(207)Pb decline to their lowest values (1.167) while Pb/Al and Zn/Al increase; and Early Iron Age (~2800-2470 cal.yr. BP), (206)Pb/(207)Pb increase to 1.186, most metal/Al ratios decrease but Zn/Al shows a peak. At the beginning of the Late Iron Age, (206)Pb/(207)Pb ratios and metal enrichments show a rapid return to pre-anthropogenic values. These results provide evidence of regional/local atmospheric metal pollution triggered by the earliest phases of mining/metallurgy in the area, and reconcile paleo-environmental and

  10. Early atmospheric metal pollution provides evidence for Chalcolithic/Bronze Age mining and metallurgy in Southwestern Europe.

    Science.gov (United States)

    Martínez Cortizas, Antonio; López-Merino, Lourdes; Bindler, Richard; Mighall, Tim; Kylander, Malin E

    2016-03-01

    Although archaeological research suggests that mining/metallurgy already started in the Chalcolithic (3rd millennium BC), the earliest atmospheric metal pollution in SW Europe has thus far been dated to ~3500-3200 cal.yr. BP in paleo-environmental archives. A low intensity, non-extensive mining/metallurgy and the lack of appropriately located archives may be responsible for this mismatch. We have analysed the older section (>2100 cal.yr. BP) of a peat record from La Molina (Asturias, Spain), a mire located in the proximity (35-100 km) of mines which were exploited in the Chalcolithic/Bronze Age, with the aim of assessing evidence of this early mining/metallurgy. Analyses included the determination of C as a proxy for organic matter content, lithogenic elements (Si, Al, Ti) as markers of mineral matter, and trace metals (Cr, Cu, Zn, Pb) and stable Pb isotopes as tracers of atmospheric metal pollution. From ~8000 to ~4980 cal.yr. BP the Pb composition is similar to that of the underlying sediments (Pb 15 ± 4 μg g(-1); (206)Pb/(207)Pb 1.204 ± 0.002). A sustained period of low (206)Pb/(207)Pb ratios occurred from ~4980 to ~2470 cal.yr. BP, which can be divided into four phases: Chalcolithic (~4980-3700 cal.yr. BP), (206)Pb/(207)Pb ratios decline to 1.175 and Pb/Al ratios increase; Early Bronze Age (~3700-3500 cal.yr. BP), (206)Pb/(207)Pb increase to 1.192 and metal/Al ratios remain stable; Late Bronze Age (~3500-2800 cal.yr. BP), (206)Pb/(207)Pb decline to their lowest values (1.167) while Pb/Al and Zn/Al increase; and Early Iron Age (~2800-2470 cal.yr. BP), (206)Pb/(207)Pb increase to 1.186, most metal/Al ratios decrease but Zn/Al shows a peak. At the beginning of the Late Iron Age, (206)Pb/(207)Pb ratios and metal enrichments show a rapid return to pre-anthropogenic values. These results provide evidence of regional/local atmospheric metal pollution triggered by the earliest phases of mining/metallurgy in the area, and reconcile paleo-environmental and

  11. Reconstructing the Palaeogeographies of a Neolithic - Bronze Age Settlement Mound at Ephesos, Turkey

    Science.gov (United States)

    Ehlers, Lisa; Friederike, Stock; Barbara, Horejs; Helmut, Brückner

    2014-05-01

    Although Ephesos and its surroundings has long been an area of archaeological interest and investigations, the focus has mainly been on sites related to Antiquity and Late Antiquity. Until recently systematic research concerning prehistoric phases of occupation within this region have been lacking. Due to the growing interest in these time periods along the West Anatolian coast, archaeological research projects involving the study of the newly discovered prehistoric settlement mounds located in the vicinity of the prominent ancient city were initiated. The aim of this study was to examine the palaeogeographical and geoarchaeological contexts of the mound (tell), Çukuriçi Höyük, in order to determine the thickness and age of the settlement layers as well as the spatial extent of the tell throughout the different periods of settlement. As additional research to the excavations, 20 sediment cores drilled on and around Çukuriçi Höyük were examined and their physical and geochemical properties as well as existing data were used to reconstruct the palaeoenvironment. The chronostratigraphy relies on AMS-14C ages and findings of diagnostic ceramics; a further attempt was made by luminescence dating. The results reveal that the inhabitants intentionally choose the location due to the beneficial topography, initially, i.e. during Pottery Neolithic times in the early 7th mill. BC, lying upon an elevation within a fertile alluvial plain about 1.5-2 km away from the coast. It seems that during the time of settling (Pottery Neolithic - Early Bronze Age) several rivers flowed in the direct vicinity of the tell. The elevated terrain provided the inhabitants security from the torrents. In addition, the corings reveal that the tell covers an area of about 11,000 m2 and a thickness of settlement layers of c. 8 m. Finally, as a possible result of water management conducted by the inhabitants, sediments related to low-energy depositional conditions are identified at the foot of

  12. Environmental impact of copper mining and metallurgy during the Bronze Age at Kargaly (Orenburg region, Russia

    Directory of Open Access Journals (Sweden)

    Vicent García, Juan Manuel

    2010-12-01

    Full Text Available Kargaly (Orenburg, Russia is a copper-producing region in which two main phases of mining activity have taken place: the 4th-2nd millennia BC and the 18th-20th centuries AD. This article is a comparative study on the impact of those mining episodes in the distribution of the forest resources in the region, aimed to estimate the scale of prehistoric mining and metallurgical works. For that purpose two paleopalinological sequences obtained from natural deposits located in Kargaly are analysed by inferential Statistics and Multivariate Methods. The results are compared both with a regional sampling of recent pollen rain supported by an analytical model of the present day landscape, and with the anthracological data coming from the Late Bronze Age settlement of Gorny 1. Analysis confirm the large scale of the prehistoric mining impact on the forest cover from the beginnings, as well as the strong effect of husbandry once mining works ended. These results allow us to dismiss a climatic change as main explanation for the detected diachronic variability in the palinological record. They also prove the viability of the proposed approach as a means of integrating the paleoenvironmental disciplines in Landscape Archaeology.

    Kargaly (región de Orenburgo, Rusia es una región cuprífera explotada entre los milenios IV y II cal BC y los siglos XVIII y XX d.C. El objetivo del artículo es estudiar comparativamente el impacto de estos episodios mineros en la distribución de los recursos forestales de la región, para aproximar la escala de las operaciones minero-metalúrgicas prehistóricas. Para ello se analizan con métodos estadísticos inferenciales y multivariantes dos secuencias paleopalinológicas procedentes de depósitos naturales de la región y se comparan con un muestreo regional de la lluvia polínica reciente apoyado por un modelo analítico del paisaje actual y con los datos antracol

  13. Solvothermal Synthesis of Caesium Tungsten Bronze in the Presence of Various Organic Acids and Its NIR Absorption Properties

    Energy Technology Data Exchange (ETDEWEB)

    Guo, Chongshen; Yin, Shu; Sato, Tsugio [Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai (Japan); Adachi, Kenji; Chonan, Takeshi, E-mail: bigguop@mail.tagen.tohoku.ac.jp [Ichikawa Research Laboratory, Sumitomo Metal Mining Co., Ltd (Japan)

    2011-10-29

    Nanoparticles of caesium tungsten bronze were successfully synthesized by solvothermal reactions in ethanol with the introduction of different organic fatty acids with various carbon numbers of 1 to 5. Compared to the sample prepared in pure ethanol, the samples obtained by mixed solvent of ethanol and fatty acids showed higher production yield, smaller particle size, more uniform particles size distribution and higher Cs/W atomic ratio. In addition, all of samples obtained using acids-ethanol mixed solvent exhibited higher visible light transmittance and greater NIR absorption performance, indicating the potential application for smart window and heat-ray shielding materials. The addition of acetic acid showed the best performance to facilitate the formation of well dispersed Cs{sub x}WO{sub 3} regular nanorods, leading to its excellent optical properties.

  14. Stable Carbon Isotope Evidence for Neolithic and Bronze Age Crop Water Management in the Eastern Mediterranean and Southwest Asia.

    Directory of Open Access Journals (Sweden)

    Michael P Wallace

    Full Text Available In a large study on early crop water management, stable carbon isotope discrimination was determined for 275 charred grain samples from nine archaeological sites, dating primarily to the Neolithic and Bronze Age, from the Eastern Mediterranean and Western Asia. This has revealed that wheat (Triticum spp. was regularly grown in wetter conditions than barley (Hordeum sp., indicating systematic preferential treatment of wheat that may reflect a cultural preference for wheat over barley. Isotopic analysis of pulse crops (Lens culinaris, Pisum sativum and Vicia ervilia indicates cultivation in highly varied water conditions at some sites, possibly as a result of opportunistic watering practices. The results have also provided evidence for local land-use and changing agricultural practices.

  15. Reconstructing hidden landscapes. DC and EM prospections in the Terramara Santa Rosa (bronze age settlement - northern Italy)

    Science.gov (United States)

    Mele, M.; Cremaschi, M.; Giudici, M.; Bassi, A.; Pizzi, C.; Lozej, A.

    2012-04-01

    The Terramara Santa Rosa is an archaeological site, located in the Po alluvial plain (northern Italy), which has been explored since 1986. As as seen by aerial photograph, Santa Rosa site is constituted by two moated villages of the Middle and Late Bronze Ages (1600-1150 BC), delimited by earth rampart. The smaller and older settlement (Villaggio Piccolo; VP), to the North, has a nearly circular shape and was founded during the Middle Bronze age, whereas the larger and younger one, delimited by a wide U-shaped rampart, is mostly dates to the Recent Bronze age. These settlements are surrounded by wide, asymmetrical moats, smooth and gradual on the exterior, steep and inaccessible on the village side, running parallel to the villages fences and being part of a complex hydraulic system; stratigraphic excavation involved the VP, at the transition between the VG and the hydraulic system, to the South. As the Bronze landscape is today sealed by flood plain clays, up to 3-4 m thick, which hide the archeological features and constitutes the present-day topography, a large-scale geophysical survey was planned to integrate to map the buried structure of the settlements and surrounding areas and to yield useful information to plan future archeological excavations. At this purpose, Direct Current Electrical Resistivity Imaging (ERI) and Electro-Magnetic Induction (EMI) geophysical prospections were applied to reveal the near-surface, lateral and vertical heterogeneities in order to improve the likelihood of locating the villages, the moats and other hidden targets in the surroundings. 70 ERI profiles, with Wenner and Wenner-Schlumberger array were collected with roll-along technique and electrode spacing ranging from 1 m to 3 m, for an exploration depth of 15 m below the ground surface and a total length greater than 9000 m. EMI survey was conducted over a 16 ha wide area in order to map shallow heterogeneities at the entire site scale. Data acquisition was conducted with a

  16. Air pollution inside a small bronze foundry plant, measured by the energy dispersive X-ray fluorescence technique

    International Nuclear Information System (INIS)

    The aim of this paper was to evaluate the chemical concentration of some elements in Suspended Particulate Matter (SPM) inside a small bronze (copper and zinc alloy) foundry plant. Using a rotating streaker air-particulate sampler, it was possible to collect fine (aerodynamic diameters between 2.5 to 10 μm) and coarse particulates (aerodynamic diameters larger than 10 μm) in strips deposited on membranes, during eight hours, with a twenty minutes step. This first fraction is particularly important, because it can reach the lung alveoli and, depending on their chemical composition and concentration, cause serious damage to the health. Each sample strip, containing the deposited SPM was analyzed by energy dispersive X-ray Fluorescence (EDXRF) technique, using in the excitation a collimated the X-ray beam coming from a Mo target tube (30 kV, 20 ma, Zr filter). For collimating it was used a bronze collimator with 72 mm long, 10 mm at entrance diameter and 5 x 0.5 mm rectangular slit at exit. The characteristic X-ray detection was carried out using a Si(Li) semiconductor detector coupled to a multi-channel analyzer, and the X-ray spectra were fitted with the AXIL software. The temporal profiles for twelve chemical elements are evaluated. The critical moment to the worker health in that industrial activity was during the molding process, when high concentration peaks for toxic chemical elements were measured: Zn, Pb, Cu e Ni in the fine and coarse fractions, and Cr in the coarse fraction. The Pb concentration found in the suspended particulate was shown very superior to the maximum level established by WHO, suggesting a constant monitoring of the atmosphere in these work places.(Author)

  17. Strong genetic admixture in the Altai at the Middle Bronze Age revealed by uniparental and ancestry informative markers.

    Science.gov (United States)

    Hollard, Clémence; Keyser, Christine; Giscard, Pierre-Henri; Tsagaan, Turbat; Bayarkhuu, Noost; Bemmann, Jan; Crubézy, Eric; Ludes, Bertrand

    2014-09-01

    The Altai Mountains have been a long-term boundary zone between the Eurasian Steppe populations and South and East Asian populations. To disentangle some of the historical population movements in this area, 14 ancient human specimens excavated in the westernmost part of the Mongolian Altai were studied. Thirteen of them were dated from the Middle to the End of the Bronze Age and one of them to the Eneolithic period. The environmental conditions encountered in this region led to the good preservation of DNA in the human remains. Therefore, a multi-markers approach was adopted for the genetic analysis of identity, ancestry and phenotype markers. Mitochondrial DNA analyses revealed that the ancient Altaians studied carried both Western (H, U, T) and Eastern (A, C, D) Eurasian lineages. In the same way, the patrilineal gene pool revealed the presence of different haplogroups (Q1a2a1-L54, R1a1a1b2-Z93 and C), probably marking different origins for the male paternal lineages. To go further in the search of the origin of these ancient specimens, phenotypical characters (i.e. hair and eye color) were determined. For this purpose, we adapted the HIrisPlex assay recently described to MALDI-TOF mass spectrometry. In addition, some ancestry informative markers were analyzed with this assay. The results revealed mixed phenotypes among this group confirming the probable admixed ancestry of the studied Altaian population at the Middle Bronze Age. The good results obtained from ancient DNA samples suggest that this approach might be relevant for forensic casework too. PMID:25016250

  18. RELIGIÃO E NEGAÇÃO DA MODERNIDADE: A LEITURA FUNDAMENTALISTA DA BÍBLIA NAS REVISTAS DE ESCOLA BÍBLICA DOMINICAL DA ASSEMBLÉIA DE DEUS

    Directory of Open Access Journals (Sweden)

    Bertone de Oliveira Sousa

    2010-05-01

    Full Text Available Este artigo investiga as peculiaridades da leitura da Bíblia realizada pelos redatores das revistas de Escola Bíblica Dominical da Assembléia de Deus no Brasil, tendo como ponto de partida a ortodoxia doutrinária professada pela igreja e o fundamentalismo religioso presente em suas representações. Para isso, faz uma breve historicização da igreja, bem como uma problematização do conceito de fundamentalismo, para depois analisar-se as revistas de faixa etária de jovens e adultos da editora CPAD, privilegiando-se as que abordam temas relacionados a questões sociais como secularismo, humanismo, aborto, eutanásia, divórcio, evolucionismo, ateísmo, homossexualismo, entre outros. Investiga-se também como essa leitura se contrapõe a uma concepção histórico-crítica da Bíblia e a aspectos da modernidade que a instituição sente ameaçarem sua integridade doutrinária. Este texto situa-se no marco teórico da História Cultural a fim de apreender as características das representações sociais produzidas pelo grupo religioso aqui estudado.

  19. Políticas Sociales I: Un Marco Conceptual para el Análisis Políticas Sociales I: Un Marco Conceptual para el Análisis

    Directory of Open Access Journals (Sweden)

    Osvaldo Larragaña

    1993-03-01

    Full Text Available This article presents an analytical review of the main aspects that need to be considered in the design and evaluation of social programs. Seven topics are presented and discussed; funding of the Social Policy, costs and benefits of a decentralization process and its impact on the effectiveness of social programs; efficiency in public spending; the targetting of the Social Policy; public provision of public services; cost recovery in social programs; and finally, an analysis of the complementarities among different social programs. Políticas Sociales I: Un Marco Conceptual para el Análisis

  20. CAMAM instrument suite for MarcoPolo-R mission to an asteroid

    Science.gov (United States)

    Tulej, Marek; Riedo, Andreas; Neuland, Maike; Meyer, Stefan; Wurz, Peter; Thomas, Nicolas

    2013-04-01

    CAMAM (Composition And Morphology of Asteroid's Material) is an analytical instrument suite developed for investigation of composition and morphology of asteroidal matter for the MarcoPolo-R sample return mission from a primitive near-Earth asteroid. The instrument combines a microscope-camera system (MCS), a laser ablation time-of-flight mass spectrometer (LMS), and a regolith particle trap (PT). PT uses a charged metallic foil to attract mm-sized or smaller regolith particles from a dust cloud that will be lifted up during the sampling phase. A translational mechanism will deliver the samples to the measurement location inside the CAMAM instrument. CAMAM will conduct measurements by complementary methodologies in a symbiotic way and will allow characterisation of regolith samples by optical investigation and mass spectrometry. MCS will identify and characterise sample components, such as chondrules, matrix, refractory inclusions, down to individual micro-metre-sized grains and particles. Surface features larger than a few µm will be characterised by multicolour imagery, imagery of fluorescence induced by UV sample irradiation, and polarisation analysis of light reflected from the surface. The microscope will yield structural details and morphology of a sample including sample shape, size and texture. Investigation of optical spectral properties of the sample surface will also provide an insight to surface mineralogy and help in identification of organic compound deposits. LMS will conduct measurements of the elemental composition of a sample down to a level of ppm, the isotopic distribution of elements, and also will investigate the molecular compounds that are located on the sample surface. CAMAM studies will allow a comprehensive investigation of the interrelationship between grains, their structure, chemical composition, mineralogy, and adsorbed molecules. We will discuss concepts underlying CAMAM instrument operation and demonstrate instrumental performance

  1. Origin and characteristics of discharge at San Marcos Springs based on hydrologic and geochemical data (2008-10), Bexar, Comal, and Hays Counties, Texas

    Science.gov (United States)

    Musgrove, MaryLynn; Crow, Cassi L.

    2012-01-01

    The Edwards aquifer in south-central Texas is a productive and important water resource. Several large springs issuing from the aquifer are major discharge points, popular locations for recreational activities, and habitat for threatened and endangered species. Discharges from Comal and San Marcos Springs, the first and second largest spring complexes in Texas, are used as thresholds in groundwater management strategies for the Edwards aquifer. Comal Springs is generally understood to be supplied by predominantly regional groundwater flow paths; the hydrologic connection of San Marcos Springs with the regional flow system, however, is less understood. During November 2008–December 2010, a hydrologic and geochemical investigation of San Marcos Springs was conducted by the U.S. Geological Survey (USGS) in cooperation with the San Antonio Water System. The primary objective of this study was to define and characterize sources of discharge from San Marcos Springs. During this study, hydrologic conditions transitioned from exceptional drought (the dry period, November 1, 2008 to September 8, 2009) to wetter than normal (the wet period, September 9, 2009 to December 31, 2010), which provided the opportunity to investigate the hydrogeology of San Marcos Springs under a wide range of hydrologic conditions. Water samples were collected from streams, groundwater wells, and springs at and in the vicinity of San Marcos Springs, including periodic (routine) sampling (every 3–7 weeks) and sampling in response to storms. Samples were analyzed for major ions, trace elements, nutrients, and selected stable and radiogenic isotopes (deuterium, oxygen, carbon, strontium). Additionally, selected physicochemical properties were measured continuously at several sites, and hydrologic data were compiled from other USGS efforts (stream and spring discharge). Potential aquifer recharge was evaluated from local streams, and daily recharge or gain/loss estimates were computed for several

  2. Macrophage receptor with collagenous structure (MARCO) is a dynamic adhesive molecule that enhances uptake of carbon nanotubes by CHO-K1 Cells

    International Nuclear Information System (INIS)

    The toxicity of carbon nanotubes (CNTs), a highly promising nanomaterial, is similar to that of asbestos because both types of particles have a fibrous shape and are biopersistent. Here, we investigated the characteristics of macrophage receptor with collagenous structure (MARCO), a membrane receptor expressed on macrophages that recognizes environmental or unopsonized particles, and we assessed whether and how MARCO was involved in cellular uptake of multi-walled CNTs (MWCNTs). MARCO-transfected Chinese hamster ovary (CHO-K1) cells took up polystyrene beads irrespective of the particle size (20 nm–1 μm). In the culture of MARCO-transfected CHO-K1 cells dendritic structures were observed on the bottom of culture dishes, and the edges of these dendritic structures were continually renewed as the cell body migrated along the dendritic structures. MWCNTs were first tethered to the dendritic structures and then taken up by the cell body. MWCNTs appeared to be taken up via membrane ruffling like macropinocytosis, rather than phagocytosis. The cytotoxic EC50 value of MWCNTs in MARCO-transfected CHO-K1 cells was calculated to be 6.1 μg/mL and transmission electron microscopic observation indicated that the toxicity of MWCNTs may be due to the incomplete inclusion of MWCNTs by the membrane structure. -- Highlights: ►Carbon nanotubes (CNTs) were tethered to MARCO in vitro. ►CNTs were taken up rapidly into the cell body via MARCO by membrane ruffling. ►The incomplete inclusion of CNTs by membranes caused cytotoxicity.

  3. Macrophage receptor with collagenous structure (MARCO) is a dynamic adhesive molecule that enhances uptake of carbon nanotubes by CHO-K1 Cells

    Energy Technology Data Exchange (ETDEWEB)

    Hirano, Seishiro, E-mail: seishiro@nies.go.jp [Environmental Nanotoxicology Project, RCER, National Institute for Environmental Studies (Japan); Fujitani, Yuji; Furuyama, Akiko [Environmental Nanotoxicology Project, RCER, National Institute for Environmental Studies (Japan); Kanno, Sanae [Department of Legal Medicine, St. Marianna School of Medicine (Japan)

    2012-02-15

    The toxicity of carbon nanotubes (CNTs), a highly promising nanomaterial, is similar to that of asbestos because both types of particles have a fibrous shape and are biopersistent. Here, we investigated the characteristics of macrophage receptor with collagenous structure (MARCO), a membrane receptor expressed on macrophages that recognizes environmental or unopsonized particles, and we assessed whether and how MARCO was involved in cellular uptake of multi-walled CNTs (MWCNTs). MARCO-transfected Chinese hamster ovary (CHO-K1) cells took up polystyrene beads irrespective of the particle size (20 nm–1 μm). In the culture of MARCO-transfected CHO-K1 cells dendritic structures were observed on the bottom of culture dishes, and the edges of these dendritic structures were continually renewed as the cell body migrated along the dendritic structures. MWCNTs were first tethered to the dendritic structures and then taken up by the cell body. MWCNTs appeared to be taken up via membrane ruffling like macropinocytosis, rather than phagocytosis. The cytotoxic EC{sub 50} value of MWCNTs in MARCO-transfected CHO-K1 cells was calculated to be 6.1 μg/mL and transmission electron microscopic observation indicated that the toxicity of MWCNTs may be due to the incomplete inclusion of MWCNTs by the membrane structure. -- Highlights: ►Carbon nanotubes (CNTs) were tethered to MARCO in vitro. ►CNTs were taken up rapidly into the cell body via MARCO by membrane ruffling. ►The incomplete inclusion of CNTs by membranes caused cytotoxicity.

  4. Calidad en los servicios de salud desde los marcos de sentido de diferentes actores sociales en colombia y brasil

    OpenAIRE

    Delgado Gallego, Maria Eugenia; Vázquez Navarrete, Maria Luisa; de Moraes Vanderlei, Lygia Carmen

    2012-01-01

    Objetivo Analizar los marcos de sentido en la definición de la calidad de un servicio de salud de los diversos actores sociales en Colombia y Brasil. Método Estudio cualitativo, descriptivo-interpretativo, mediante grupos focales y entrevistas individuales en dos municipios de Colombia y Brasil. Muestra teórica de agentes sociales, buscando variedad del discurso: a. Usuarios y líderes; b. Personal de salud y; c. Formuladores de políticas. Análisis de contenido, con generación mixta de categor...

  5. La educación ambiental en el marco de los foros internacionales: una alternativa de desarrollo

    OpenAIRE

    Beatriz Olivia Camarena Gómez

    2006-01-01

    En este trabajo se presenta una breve caracterización del problema ambiental contemporáneo y se esboza el desarrollo de la educación ambiental en el marco delos foros internacionales. Se reconoce laimportancia de trabajar en la conformación de una sociedad civil informada, consciente y organizada. Esto implica identificar y analizar las condiciones reales de asimilación del saber ambiental dentro de los paradigmas legitimados del conocimiento; y en el terreno educativo, identificar los método...

  6. Los movimientos sociales y los marcos de acción colectiva que apoyan la lucha contra la precariedad laboral

    OpenAIRE

    Pinto Mascareño, Raquel Mercedes

    2009-01-01

    Este trabajo revisa las teorías que han explicado la acción colectiva: los enfoques Clásicos; la perspectiva de la Movilización de Recursos, la perspectiva de los Nuevos Movimientos Sociales y la actual perspectiva Socio Construccionista de los ‘marcos de acción colectiva’. Argumentamos, sin embargo que, aún cuando Gamson (1992) y Klandermans (1997), destaquen la importancia de definir un sentido de injusticia, agencia e identidad colectiva antagónica compartidos para apoyar la acción colecti...

  7. El “análisis de los marcos”en la obra de William Gamson

    OpenAIRE

    Aquiles Chihu Amparán; Alejandro López Gallegos

    2004-01-01

    El estudio de los movimientos sociales ha girado principalmente en torno al análisis de los aspectos políticos, organizativos y estructurales. El enfoque de los ?marcos? (frames) constituye un aporte que enfatiza las condiciones de producción y difusión de elementos ideológicos y culturales. Nuestro artículo intenta contribuir al conocimiento de esta perspectiva de análisis reseñando la obra de William Gamson, de quien exponemos su perspectiva teórica en relación a la cultura política, consti...

  8. PROPUESTA DE UN MARCO FISCAL PROPIO DEL TRABAJO AUTÓNOMO/PROPOSAL FOR AN ATTORNEY'S OWN SELF-EMPLOYMENT

    OpenAIRE

    Alvaro BAJEN GARCÍA

    2008-01-01

    Con la aprobación del Estatuto del Trabajo Autónomo se resalta en nuestro país la figura del empresario individual a través de la prestación que realiza este empresario, surge el concepto de trabajo autónomo como una realidad que tendrá fuerza expansiva en todos los órdenes jurídicos. En materia de fiscalidad el Estatuto no aborda un marco fiscal específico, únicamente mandata a los poderes públicos para que con una política fiscal adecuada promocione el trabajo autónomo. No obstante nuestro ...

  9. La creación de spin-offs universitarias en la universidad española: marco legal

    OpenAIRE

    Beraza Garmendia, José María

    2010-01-01

    La creación, consolidación y proliferación de spin-offs universitarias requiere que se cumplan una serie de requisitos previos: inversión en I+D que contribuya a crear nuevas oportunidades tecnológicas; capital-riesgo para financiar las primeras etapas de desarrollo de una spin-off; una cultura favorable al emprendizaje en el entorno universitario; programas específicos de apoyo a la creación de spin-offs; un marco regulatorio-institucional que favorezca la I+D+i, la protección de la propi...

  10. Marco teórico y metodológico para el estudio del límite

    OpenAIRE

    Claros, Francisco Javier; Sánchez, María Teresa; Coriat, Moisés

    2014-01-01

    Nuestras investigaciones dan cabida, con los mismos métodos, a diferentes nociones del límite, como límite finito de una sucesión o límite finito de una función en un punto. Consideramos tres elementos relacionados: fenomenología, sistemas de representación y pensamiento matemático avanzado. En la primera parte lo explicamos y presentamos ideas de otros marcos teóricos. Hemos usado las mismas herramientas metodológicas para descubrir y estudiar los fenómenos organizados por tres c...

  11. Teorías del crecimiento regional y el desarrollo divergente. Propuesta de un marco de referencia

    OpenAIRE

    Luis Enrique Gutiérrez Casas

    2006-01-01

    Las teorías del crecimiento regional [TCR] son de fundamental importancia no únicamente para la comprensión del proceso de crecimiento, sino de las desigualdades o asimetrías inter e intrarregionales; esto es, del desarrollo divergente. El propósito de este artículo es proponer un marco de referencia general de las TCR bajo el entendido de que éstas son complementarias y no excluyentes. En un principio justificamos la revisión de las TCR y explicamos su pertinenc...

  12. Segurança em África: intervenção da UE no processo de democratização da RDC: a Missão Eupol-Kinshasa

    OpenAIRE

    Gonçalves, José Carlos

    2011-01-01

    Numa vertente de contextualização própria, tratamos o caso da República Democrática do Congo (RDC), um país de enormes recursos, mas onde o conflito tem impedido o desenvolvimento. Para isso, integramos o tema nas referências teóricas relativas a Conflito, Paz e Democracia, conferindo-lhe assim, o enquadramento necessário, ao mesmo tempo que fazemos a delimitação conceptual. Depois de caracterizarmos o país, percorremos os marcos da sua História recente, que é marcada por conflitos sang...

  13. Effect of protective release coatings on the basis of superdispersersed zirconium oxide powder on the formation of gas defects in bronze casting

    Science.gov (United States)

    Martyushev, Nikita V.; Risto, Nikolay A.

    2014-10-01

    This paper investigates the use of nanopowders in the composition of foundry coatings when casting leaded tin bronzes. Influence of the composition of the applied protective coating on surface finish is studied. The effects of the coatings of the following compositions are compared: non-stick coating (a mixture of low-dispersed chromium oxide powder and heat-treated vegetable oil); non-stick lubricant ASPF-2/RgU on the basis of low- dispersed graphite powder and heat-treated vegetable oil; patent #2297300 (a mixture of superdispersed zirconium dioxide powder with industrial oil). It is demonstrated that application of foundry coatings containing superdispersed metal oxide powders with low thermal conductivity makes it possible to significantly reduce irregularities and eliminate gas porosity on the surface of tin-leaded bronze castings.

  14. A Facile One-Step Solvothermal Synthesis and Electrical Properties of Reduced Graphene Oxide/Rod-Shaped Potassium Tungsten Bronze Nanocomposite.

    Science.gov (United States)

    Liu, Bin; Yin, Shu; Wang, Yuhua; Guo, Chongshen; Wu, Xiaoyong; Dong, Qiang; Kobayashi, Makoto; Kakihana, Masato; Sato, Tsugio

    2015-09-01

    Reduced graphene oxide (rGO)/rod-shaped potassium tungsten bronze nanocomposites with the different ratio were successfully synthesized by solvothermal reaction and followed by the reduction in H2(5 vol.%)/N2 atmosphere at 550 degrees C. The coupled samples showed excellent shielding ability of NIR light as well as certain visible lights transparency. The synergistic effects could be observed in the composites, i.e., when 15 wt% and 20 wt% of rGO which was fabricated by chemical reduction of graphene oxide, were composed into K(x)WO3, the composite showed the higher electrical conductivity than those of rGO and potassium tungsten bronze. PMID:26716327

  15. Behavior of the monophosphate tungsten bronzes (PO{sub 2}){sub 4}(WO{sub 3}){sub 2m} (m=4 and 6) in electrochemical lithium insertion

    Energy Technology Data Exchange (ETDEWEB)

    Longoria Rodriguez, F.E.; Martinez-de la Cruz, A.; Lopez Cuellar, E. [Division de Estudios de Posgrado, Facultad de Ingenieria Mecanica y Electrica, Universidad Autonoma de Nuevo Leon, Pedro de Alba s/n, Ciudad Universitaria, C.P. 66451, San Nicolas de los Garza, NL (Mexico)

    2006-10-06

    The electrochemical lithium insertion process has been studied in the family of monophosphate tungsten bronzes (PO{sub 2}){sub 4}(WO{sub 3}){sub 2m}, where m=4 and 6. Structural changes in the pristine oxides were followed as lithium insertion proceeded. Through potentiostatic intermittent technique, the different processes which take place in the cathode during the discharge of the cell were analysed. The nature of the bronzes Li{sub x}(PO{sub 2}){sub 4}(WO{sub 3}){sub 2m} formed was determined by in situ X-ray diffraction experiments. These results have allowed establishment of a correlation with the reversible/irreversible processes detected during the electrochemical lithium insertion. Measurements of resistivity showed that upon lithium insertion, the metallic pristine oxides become insulating. (author)

  16. 论滇文化的青铜贮贝器%On Shell-storing Bronze Containers in the Dian Culture

    Institute of Scientific and Technical Information of China (English)

    肖明华

    2004-01-01

    Shell-storing bronze containers constitute one of the representative objects of the Dian culture. Unique in function and form and rich in cultural content, they have high value to historical study, artistic appreciation and scientific research. In form they can be divided into five types: bronze drums, drum-shaped, piled-drums-shaped, barrel-shaped, and washer-shaped. Such containers made their first appearance in the Dian culture in the late Spring-and-Autumn period, prevailed in the Warring States period to the early and middle Western Han and stopped function at the turn from the Western Han to the Eastern Han. They are decorated with human activity scenes and designs, such as representations of sacrifice, farming, herding, spinning and weaving, fair attending, boating, dancing, fighting and hunting, as well as animal designs, including tiger and ox fight scenes and other figures. Their casting technology is characterized by the use of composite molds and the lost wax method.

  17. 论安阳殷墟墓葬青铜武器的组合%Combination of Bronze Weapons in Tombs on the Yin Ruins in Anyang

    Institute of Scientific and Technical Information of China (English)

    刘一曼

    2002-01-01

    There are 12 combinations of bronze weapons in Yin tombs at Anyang, with ge dag-ger-axes as the most frequently seen key objects. Among the tombs with bronze weapons, as the tomb-owners varied in status before their death, their funeral weapons bear distinct differences in type, number and quality. High-ranking officers possessed yue battle-axes, ge, spears and arrowheads, with swords added in some cases. Their number ranged from dozens to hundreds, and yue and swords were the symbols of commandership. Middle- and low-ranking officers had some dozen weapons in the ge-spear-arrowhead or ge-spear set. Commanders at the grass-root level used only two types of the ge, spear and arrowhead, which number no more than ten. Ordinary soldiers were armed with one of the ge, spear and arrowhead, in one or two pieces in case of the former two.

  18. Modelos para o planejamento centralizado da produçao e o transporte na cadeia de suprimento: uma revisao

    OpenAIRE

    Mula, Josefa; Peidro, David; Díaz-Madronero, Manuel; JORGE E. HERNÁNDEZ

    2011-01-01

    Este artigo apresenta uma revisao bibliográfica sobre os modelos de programaçao matematica para o planejamento centralizado da produçao e a transporte em uma cadeia de suprimento. O propósito desta revisao e identificar a pesquisa atual e futura neste campo e propor um marco de classificaçao baseado nos seguintes elementos: Estrutura da cadeia de suprimento, nivel de decisao, enfoque de modelagem, propósito, informaçao intercambiada e aplicaçao pratica. O objetivo do artigo e proporcionar um ...

  19. Novas abordagens no ensino de enfermagem fundamental: experiência docente no ensino da ética profissional

    Directory of Open Access Journals (Sweden)

    Therezinha Teixeira Vieira

    1985-06-01

    Full Text Available O trabalho apresenta alguns dados históricos do ensino da ética na Escola de Enfermagem da UFBA e situa a disciplina Exercício de Enfermagem e Deontologia no Currículo atual desta Escola. São explicitados o marco conceituai, os objetivos, o conteúdo programático, as estratégias utilizadas e o processo de avaliação. Após as conclusões, são feitas recomendações consideradas adequadas ao assunto.

  20. Infant/child burials and social reproduction in the Bronze Age and Early Iron Age (c. 2100-800 BC) of Central Italy

    OpenAIRE

    Rossenberg, E.A.; Bacvarov, K

    2008-01-01

    Abstract: Special treatment of the remains of children is a well-known feature in Central Italy from the Neolithic onwards. Here I will focus on the evidence for the Bronze Age and Early Iron Age in two adjacent Central Italian regions (Abruzzo and Lazio). It will be argued that mortuary practice involving neonates, infants and children was connected with domestic symbolism, showing the enhanced cultural significance of infant/child burials. Investing child burials with domestic symbolism, bu...

  1. Au-Sn-W-Cu-Mineralization in the Astaneh-Sarband Area, West Central Iran : including a comparison of the ores with ancient bronze artifacts from Western Asia

    OpenAIRE

    Nezafati, Nima

    2006-01-01

    The present study deals with two primary aims; (1) geological, mineralogical, and geochemical investigations of the Deh Hosein, Astaneh, and Nezam Abad mineralizations in the Astaneh-Sarband area, west central Iran, with the aim to understand the characteristics of the occurrences and their conditions of formation, and (2) geochemical investigations on ancient bronze artifacts from Iran and Western Asia in order to compare their characteristics with the high-tin copper ore of Deh Hosein and e...

  2. Provenance of early bronze age metal artefacts in western Switzerland using elemental and lead isotopic compositions and their possible relation with copper minerals of the nearby Valais

    OpenAIRE

    Cattin, Florence; Guénette-Beck, Barbara; Curdy, Philippe; Meisser, Nicolas; Ansermet, Stefan; Hofmann, Beda; Kündig, Rainer; Hubert, Vera; Wörle, Marie; Hametner, Kathrin; Günther, Detlef; Wichser, Adrian; Ulrich, Andrea; Villa, Igor M.; Besse, Marie

    2011-01-01

    Ten Early Bronze Age (BzA1, 2200-2000 BC) copper artefacts from the central Valais region from Switzerland were studied for their elemental composition and lead isotope ratios. In order to answer the archaeological question of a local copper supply, a database for copper minerals across the Valais (Switzerland) has been established. This database contains 69 data on lead isotope ratios as well as additional information on the minerals and geochemical associations for copper minerals from 38 l...

  3. The pots and potters of Assyria: technology and organization of production, ceramics sequence and vessel function at Late Bronze Age Tell Sabi Abyad, Syria

    OpenAIRE

    Duistermaat, Kim

    2007-01-01

    “The Pots and Potters of Assyria” is a comprehensive discussion of all evidence relating to pottery production from the Late Bronze Age site of Tell Sabi Abyad, Syria. Technological, morphological, stylistic and archaeological data are integrated into the understanding of pottery production and use. The pottery itself and its chronological sequence, the shaping and firing techniques, raw materials, wasters and unfired pottery are presented. In addition, workshops and their layout, tools, as w...

  4. Sous l’angle du genre: analyse de nécropoles de l’âge du Bronze (15e-13e siècle av. J.-C.) d’Italie du Nord et comparaisons avec le nord des Alpes

    OpenAIRE

    David-El Biali, Mireille

    2010-01-01

    The scope of my research is to examine the gender roles of women and men in parts of continental Europe during the Bronze Age. Northern Italy is a very interesting area from this point of view. It is divided into two cultural provinces: the Terramare culture east of the river Oglio and the Western province to its west. Many large cemeteries were established in the Middle Bronze Age and continued to be used in the Recent Bronze Age (Bronzo recente, the phase Bronze D of the Central European ch...

  5. Indicadores de desempeño ambiental en el marco de la ISO 2600 RS

    Directory of Open Access Journals (Sweden)

    María Ángela Jiménez Montañés

    2009-12-01

    Full Text Available La Responsabilidad Social Corporativa (RSC es un instrumento que ayuda a conciliar objetivos económicos, sociales y medioambientales, a empresas de todos los tamaños, en cooperación con sus interlocutores o partes interesadas, defendiendo valores comunes y aumentando el sentido de la solidaridad y la cohesión, dentro del debate de la globalización, la competitividad y la sostenibilidad.El impacto de la RSC en la organización se manifiesta en tres dimensiones: económica, social y medioambiental, siendo en esta última, en donde vamos a centrar el trabajo. En el campo medioambiental es necesario la aplicación de sistemas de gestión que garanticen el cumplimiento de los objetivos dentro del marco de la RSC, bien basados en modelos europeos EMAS o bien según lo establecido por la ISO 14000 y por las primeras aproximaciones de la ISO 26000 RS.Uno de los instrumentos necesarios para la aplicación de los sistemas de gestión son los indicadores cuantitativos, que nos sirven como cuantificación del desempeño ambiental conseguido por las organizaciones en base a la política establecida. Los indicadores por sí mismos no nos van a proporcionar demasiada información útil, salvo que sean considerados bajo la práctica de otros métodos adicionales como puede ser el análisis DAFO o bien el benchmarking, para seleccionar estrategias en base a la comparativa de la posición de la organización en relación al resto del entorno económico.Corporate social responsibility is an instrument that helps to reconcile economic, social and environmental objectives to businesses of all sizes, in cooperation with its partners or stakeholders, to defend common values and increase the sense of solidarity and cohesion, within the debate of globalisation, competitiveness and sustainability.The impact of CSR in the organization is shown in three dimensions: economic, social and environmental; where we will focus our paper in the latter. In the environmental

  6. ITS Y SIDA en adolescentes: descripción, prevención y marco legal

    Directory of Open Access Journals (Sweden)

    Tatiana Chacón-Quesada

    2009-09-01

    Full Text Available Los adolescentes son vulnerables a adquirir ITS y VIH/SIDA por factores de riesgo como desconocimiento, sexo temprano, drogadicción, desigualdad social y de género y mitos. Las ITS más comunes son Gonorrea, Sífilis, VPH, VHS y Tricomonosis; todas son transmitidas por vía sexual sin embargo, Sífilis y Tricomonosis se pueden adquirir por otras vías de contacto. El SIDA es ocasionado por un retrovirus VIH, de transmisión sexual y transfusión sanguínea, se presenta en varias fases y lleva a la muerte. Los datos estadísticos de ONUSIDA/OMS muestran prevalencia de SIDA en población de 15 a 49 años, en Costa Rica por cada 10.000 habitantes hay 2.7 habitantes han contraído el virus del VIH/SIDA, según el último informe del Estado de la Nación. Es común que aparezcan nuevos casos de ITS, el 90 % entre los 15 - 30 años, y sobre todo en menores de 25 años. Dentro los métodos de prevención efectivos están la abstinencia, condón masculino y femenino, respecto a geles de nonoxinol-9 los estudios demuestran ineficacia y de las vacunas para VPH todavía está en estudio. Dentro del marco legal, hay penalización del delito de Propagación de enfermedades infecto-contagiosas y delito de Contagio Venéreo, también es vigente la ley del SIDA N° 7771. Además de la legislación que protege a adolescentes y demás población de Violación sexual y abuso sexual. Es necesario informar al adolescente de ITS y SIDA, porque es una población susceptible en el padecimiento de estas enfermedades. Aunque hay legislación en este tema, el derecho y la normativa parecen ir atrás de las necesidades de los posibles afectados.Teenager population due to many risk factors like unknowledge, early sex begining age, drug use and abuse, social and gender inequality and myths, is vulnerable to get transmited disease (STD and HIV/AIDS. The most common STD found are gonorrhea, syphilis and trichomoniasis (HVP, syphilis and trichomoniasis have also other routes

  7. 西周金文中的“贾”%Character“贾”in Bronze Inscriptions of the Western Zhou Period

    Institute of Scientific and Technical Information of China (English)

    彭裕商

    2003-01-01

    The author of the present paper deciphers the character “贾” in Western Zhou bronze inscriptions to be “gu贾”. He believes that its emergence was earlier than that of the character “zhu贮”,and that there was some relationship of inheritance between the “贾”in Warring States period writing and that in Western Zhou bronze inscriptions. In the Western Zhou, it was used mainly as a verb and meant trade and exchange. It could also be used as a noun, meaning officials in charge of commerce, such as “guzheng贾正” and “gushi贾师”.Sometimes it referred to a lcal state. During the early Western Zhou, there must have been traders specially engaged in long-distance transportation of goods for sale, but at present we have no evidence on the Dynastry's management of commercial activities. In the mid Western Zhou, high-ranking officials of the court interposed in trade. In the late Western Zhou, definite records about the Dynastry's sending officials to manage commerce appeared in bronze inscriptions and historical documents.

  8. Genetic characteristics and migration history of a bronze culture population in the West Liao-River valley revealed by ancient DNA.

    Science.gov (United States)

    Li, Hongjie; Zhao, Xin; Zhao, Yongbin; Li, Chunxiang; Si, Dayong; Zhou, Hui; Cui, Yinqiu

    2011-12-01

    In order to study the genetic characteristics of the Lower Xiajiadian culture (LXC) population, a main bronze culture branch in northern China dated 4500-3500 years ago, two uniparentally inherited markers, mitochondrial DNA and Y-chromosome single-nucleotide polymorphisms (Y-SNPs), were analyzed on 14 human remains excavated from the Dadianzi site. The 14 sequences, which contained 13 haplotypes, were assigned to 9 haplogroups, and Y-SNP typing of 5 male individuals assigned them to haplogroups N (M231) and O3 (M122). The results indicate that the LXC population mainly included people carrying haplogroups from northern Asia who had lived in this region since the Neolithic period, as well as genetic evidence of immigration from the Central Plain. Later in the Bronze Age, part of the population migrated to the south away from a cooler climate, which ultimately influenced the gene pool in the Central Plain. Thus, climate change is an important factor, which drove the population migration during the Bronze Age in northern China. Based on these results, the local genetic continuity did not seem to be affected by outward migration, although more data are needed especially from other ancient populations to determine the influence of return migration on genetic continuity.

  9. An Energy-Dispersive X-Ray Fluorescence Spectrometry and Monte Carlo simulation study of Iron-Age Nuragic small bronzes ("Navicelle") from Sardinia, Italy

    Science.gov (United States)

    Schiavon, Nick; de Palmas, Anna; Bulla, Claudio; Piga, Giampaolo; Brunetti, Antonio

    2016-09-01

    A spectrometric protocol combining Energy Dispersive X-Ray Fluorescence Spectrometry with Monte Carlo simulations of experimental spectra using the XRMC code package has been applied for the first time to characterize the elemental composition of a series of famous Iron Age small scale archaeological bronze replicas of ships (known as the "Navicelle") from the Nuragic civilization in Sardinia, Italy. The proposed protocol is a useful, nondestructive and fast analytical tool for Cultural Heritage sample. In Monte Carlo simulations, each sample was modeled as a multilayered object composed by two or three layers depending on the sample: when all present, the three layers are the original bronze substrate, the surface corrosion patina and an outermost protective layer (Paraloid) applied during past restorations. Monte Carlo simulations were able to account for the presence of the patina/corrosion layer as well as the presence of the Paraloid protective layer. It also accounted for the roughness effect commonly found at the surface of corroded metal archaeological artifacts. In this respect, the Monte Carlo simulation approach adopted here was, to the best of our knowledge, unique and enabled to determine the bronze alloy composition together with the thickness of the surface layers without the need for previously removing the surface patinas, a process potentially threatening preservation of precious archaeological/artistic artifacts for future generations.

  10. 西周金文构形特征探析%Structural Features of Inscriptions on Ancient Bronze Objects in Western Zhou Dynasty

    Institute of Scientific and Technical Information of China (English)

    王瑞英

    2012-01-01

    西周金文处于汉字体系的形成和发展时期。西周铜器铭文中图形文字向方块字体转变,偏旁部首增加并趋于成熟,汉字形体结构日益完善,形声结构迅速增长。对西周金文构形特征的考察能够深入了解文字发展变化的过程,从而有助于探求汉字的发展变化规律。%The inscriptions on ancient bronze objects in the Western Zhou Dynasty appeared in the times when Chinese character system formed and developed. In the inscriptions on bronze, the pictographic scripts changed to be square -shaped characters, character components increased and perfected, the form and structure were further perfect and the number of inscriptions rapidly increased. To investigate the structural features of inscriptions on ancient bronze objects will help deepen the understanding of the evolution of Chinese characters.

  11. Marcos regulatórios e inovação no transporte rodoviário de produtos perigosos: o caso das embalagens vazias de agrotóxicos

    Directory of Open Access Journals (Sweden)

    Marne Lieggio Junior

    2011-05-01

    Full Text Available

    Resumo: O objetivo deste trabalho é analisar a inovação provocada pelos marcos regulatórios na logística do transporte rodoviário de produtos perigosos, especificamente na logística das embalagens de agrotóxicos. O quadro teórico de referência aborda a Teoria da Inovação, a questão de marcos regulatórios, riscos no transporte rodoviário de produtos perigosos e o necessário uso de rotinas. A metodologia utilizada na confecção do trabalho teve caráter exploratório, baseando-se em revisão bibliográfica e nas práticas operacionais de mercado. Os resultados da pesquisa mostraram que, ao adaptar-se às novas exigências legais do ambiente institucional em que se insere, a cadeia logística reversa de embalagens de agrotóxicos produziu inovações em seu processo, utilizando-se de “recursos produtos não-utilizados”, rotinas e lições aprendidas em sua trajetória tecnológica.

    Abstract: The objective of this study is to analyze the innovation caused by the regulatory framework in the logistics of transport of dangerous goods, specifically in the logistics of packing of pesticides. The theoretical frame of reference addresses: a Theory of Innovation, the question of regulatory framework, risks in road transport of dangerous goods and necessary use of routines. The methodology used in making the work was exploratory character, based on literature review and the operational practices of the market. The survey results showed that by adapting to new legal requirements of the institutional environment which includes the reverse supply chain of packaging for pesticides produced innovations in their process, applying unused productive resources (waste, routines and lessons learned in its history technology.

  12. Application of the alpha spectrometry for the study of core sediment extracted in the San Marcos dam in Chihuahua

    International Nuclear Information System (INIS)

    The determination of the specific activities of 210Po and isotopic uranium by alpha spectrometry was performed in a sediment core from San Marcos Dam. The objective of this work was to analyze the vertical distribution of isotopic uranium and 210Po and the behavior of these radionuclides along sediment core collected from the San Marcos Dam. Sample was divided into 11 sections, in which 210Po and isotopic uranium were determined using liquid-liquid extraction with tributyl phosphate. Furthermore, it was made a comparison between the tributyl phosphate technique and the technique of extraction chromatography using UTEVA resins for uranium. The results of specific activities for 210Po show a trend to decrease along the core, whereas the uranium isotopic does not show a pointed trend. The results of isotopic ratios between the 234U and 238U show that they are close to secular equilibrium in each of the core sections. The comparison between the two uranium extraction techniques indicates that the chemical yield is better using the UTEVA technique than tributyl phosphate extraction. (Author)

  13. ‘Don’t buy without visiting the House of Apolinar’: the furniture firm of Apolinar Marcos

    Directory of Open Access Journals (Sweden)

    Rodríguez Bernis, Sofía

    2011-06-01

    Full Text Available This study deals with the commercial activities of the Madrid firm Apolinar Marcos during its two main stages, through the use of their archive containing projects for interior decoration and furniture, models, prints, photographs and drawings used as catalogues. The methods employed for obtaining materials, the system of acquiring individual and groups of pieces from other firms, the wide range of suppliers —even outside of Spain— that sent pieces as samples or on deposit, and their habitual sales methods are discussed.

    En este artículo se repasa la actividad comercial de la firma madrileña Apolinar Marcos en sus dos etapas principales, a partir de la exhumación de su archivo personal que incluye proyectos de decoraciones y muebles, modelos, láminas, fotografías y dibujos propios, ofrecidos como catálogos. Se repasan los métodos de aprovisionamiento de materiales, el sistema de adquisición de piezas y conjuntos a otras compañías, la amplia red de proveedores incluso de fuera de España, que le enviaban género a modo de muestrarios o depósitos, y su método usual de venta.

  14. PROPUESTA DE UN MARCO FISCAL PROPIO DEL TRABAJO AUTÓNOMO/PROPOSAL FOR AN ATTORNEY'S OWN SELF-EMPLOYMENT

    Directory of Open Access Journals (Sweden)

    Alvaro BAJEN GARCÍA

    2008-09-01

    Full Text Available Con la aprobación del Estatuto del Trabajo Autónomo se resalta en nuestro país la figura del empresario individual a través de la prestación que realiza este empresario, surge el concepto de trabajo autónomo como una realidad que tendrá fuerza expansiva en todos los órdenes jurídicos. En materia de fiscalidad el Estatuto no aborda un marco fiscal específico, únicamente mandata a los poderes públicos para que con una política fiscal adecuada promocione el trabajo autónomo. No obstante nuestro país debe abordar un marco fiscal general para el trabajo autónomo, promocionando e incentivando las actividades de estos autónomos a través del establecimiento de beneficios fiscales./With the adoption of the Statute of the Autonomous Labor is highlighted in our country the figure of the individual entrepreneur through the provision that makes this businessman, comes the concept of self-employment as a reality that will have expansive force in all legal orders. Taxation the statute does not address a specific tax, only mandate to the authorities so that an appropriate fiscal policy to promote self-employment. But our country must address a fiscal framework for self-employment, promoting and encouraging the activities of these self-employed through the establishment of tax benefits.

  15. Application of the alpha spectrometry for the study of core sediment extracted in the San Marcos dam in Chihuahua

    Energy Technology Data Exchange (ETDEWEB)

    Mendez G, C.; Renteria V, M.; Montero C, M. E. [Centro de Investigacion en Materiales Avanzados, S. C., Miguel de Cervantes No. 120, Complejo Industrial Chihuahua, 31109 Chihuahua (Mexico); Garcia T, R., E-mail: elena.montero@cimav.edu.mx [Universidad de Sevilla, Escuela Tecnica Superior de Arquitectura, Grupo de Fisica Nuclear Aplicada, Av. Reina Mercedes s/n, 41012 Sevilla (Spain)

    2012-06-15

    The determination of the specific activities of {sup 210}Po and isotopic uranium by alpha spectrometry was performed in a sediment core from San Marcos Dam. The objective of this work was to analyze the vertical distribution of isotopic uranium and {sup 210}Po and the behavior of these radionuclides along sediment core collected from the San Marcos Dam. Sample was divided into 11 sections, in which {sup 210}Po and isotopic uranium were determined using liquid-liquid extraction with tributyl phosphate. Furthermore, it was made a comparison between the tributyl phosphate technique and the technique of extraction chromatography using UTEVA resins for uranium. The results of specific activities for {sup 210}Po show a trend to decrease along the core, whereas the uranium isotopic does not show a pointed trend. The results of isotopic ratios between the {sup 234}U and {sup 238}U show that they are close to secular equilibrium in each of the core sections. The comparison between the two uranium extraction techniques indicates that the chemical yield is better using the UTEVA technique than tributyl phosphate extraction. (Author)

  16. Marco conceptual para el fortalecimiento de los Sistemas de Información en Salud en el Perú

    Directory of Open Access Journals (Sweden)

    Walter H Curioso

    2015-06-01

    Full Text Available En este artículo se presentan los componentes esenciales y políticas más relevantes con respecto al marco conceptual para fortalecer los sistemas de información en salud en el Perú. Se presentan, además, las principales políticas, acciones y estrategias más significativas realizadas en el campo de la salud electrónica en el Perú. Los sistemas de información en salud en el Perú cumplen un rol clave y se espera lograr un sistema de información integrado e interoperable que permita que la información en salud sea lo más completa, eficiente, de calidad y esté disponible oportunamente, para lograr mejorar la calidad de vida de las personas y permitir una modernización significativa de la salud pública en el marco de la reforma en salud en el Perú

  17. Marco conceptual para el fortalecimiento de los Sistemas de Información en Salud en el Perú

    Directory of Open Access Journals (Sweden)

    Walter H Curioso

    2015-04-01

    Full Text Available En este artículo se presentan los componentes esenciales y políticas más relevantes con respecto al marco conceptual para fortalecer los sistemas de información en salud en el Perú. Se presentan, además, las principales políticas, acciones y estrategias más significativas realizadas en el campo de la salud electrónica en el Perú. Los sistemas de información en salud en el Perú cumplen un rol clave y se espera lograr un sistema de información integrado e interoperable que permita que la información en salud sea lo más completa, eficiente, de calidad y esté disponible oportunamente, para lograr mejorar la calidad de vida de las personas y permitir una modernización significativa de la salud pública en el marco de la reforma en salud en el Perú

  18. Foraging behaviour in tadpoles of the bronze frog Rana temporalis: Experimental evidence for the ideal free distribution

    Indian Academy of Sciences (India)

    Dheeraj K Veeranagoudar; Bhagyashri A Shanbhag; Srinivas K Saidapur

    2004-06-01

    The ability of bronze frog Rana temporalis tadpoles (pure or mixed parental lines) to assess the profitability of food habitats and distribute themselves accordingly was tested experimentally using a rectangular choice tank with a non-continuous input design. Food (boiled spinach) was placed at two opposite ends of the choice tank in a desired ratio (1 : 1, 1 : 2 or 1 : 4) to create habitat A and B. The tadpoles in Gosner stage 28–33, pre-starved for 24 h, were introduced in an open ended mesh cylinder placed in the center of the choice tank, held for 4 min (for acclimation) and then released to allow free movement and habitat selection. The number of tadpoles foraging at each habitat was recorded at 10, 15, 20, 25 and 30 min time intervals. The actual suitability, (the food available in a habitat after colonization of tadpoles) of each habitat was obtained from the equation = - () where is basic suitability (amount of food provided at each habitat before release of tadpoles), is the rate of depletion of food (lowering effect) with introduction of each tadpole, and is the density of tadpoles in habitat . The expected number of tadpoles at each habitat was derived from the actual suitability. With no food in the choice tank, movement of the tadpoles in the test arena was random indicating no bias towards any end of the choice tank or the procedure. In tests with a 1 : 1 food ratio, the observed ratio of tadpoles (11.71 : 12.28) was comparable with the expected 12 : 12 ratio. The observed number of tadpoles in the habitats with a 1 : 2 food ratio was 8.71 : 15.29 and 7.87 : 16.13 for pure and mixed parental lines respectively. In both cases, the observed ratios were close to the expected values (7 : 17). Likewise, in experiments with a 1 : 4 food ratio, the observed number of tadpoles in the two habitats (10.78 : 37.22) did not differ significantly from the expected ratio of 7 : 41. In all tests, the number of R. temporalis tadpoles matched ideally with

  19. Tantalum and vanadium substitution in hexagonal K{sub 0.3}WO{sub 3} bronze. Synthesis and characterization

    Energy Technology Data Exchange (ETDEWEB)

    Rahman, Md. Shahidur; Murshed, M. Mangir; Gesing, Thorsten M. [Bremen Univ. (Germany). Chemische Kristallographie fester Stoffe; Baabe, Dirk [Technische Univ. Braunschweig (Germany). Inst. fuer Anorganische und Analytische Chemie

    2016-02-01

    Polycrystalline samples of tantalum and vanadium single and double substituted hexagonal potassium tungsten bronzes (K-HTB's) with nominal compositions of K{sub 0.3}(W{sup 6+}{sub 0.7}W{sup 5+}{sub 0.3-y}Ta{sup 5+}{sub y})O{sub 3} (0 ≤ y ≤ 0.3), K{sub 0.3}(W{sup 6+}{sub 0.7}W{sup 5+}{sub 0.3-y}V{sup 5+}{sub y})O{sub 3} (0 ≤ y ≤ 0.18) and K{sub 0.3}(W{sup 6+}{sub 0.7}W{sup 5+}{sub 0.3-y}Ta{sup 5+}{sub y/2}V{sup 5+}{sub y/2})O{sub 3} (0 ≤ y ≤ 0.3) were synthesized by solid state reactions in quartz tubes at 10{sup -7} MPa and 1073 K. The applied synthesis condition allowed K{sub 0.3}WO{sub 3} to crystallize in space group P6{sub 3}22, confirmed by X-ray powder diffraction and Raman spectroscopic analyses. In this K-HTB composition, W{sup 5+} could fully be replaced by Ta{sup 5+}, whereas V{sup 5+} could only be substituted up to y=0.16. The degree of W{sup 5+} substitution was explained in terms of second-order Jahn-Teller (SOJT) distortion of the d{sup 0} cations W{sup 6+}, Ta{sup 5+} and V{sup 5+}. The applied distortion index also demonstrates why a complete substitution of W{sup 5+} in K{sub 0.3}(W{sup 6+}W{sup 5+})O{sub 3} was allowed by a concomitant sharing of Ta{sup 5+} and V{sup 5+}, which are statistically distributed on the W{sup 5+}/W{sup 6+} sites. As W{sup 5+}(d{sup 1}) is not SOJT susceptible, it is also shown that the concentration of W{sup 5+} in tungsten bronzes plays an important role in the local WO{sub 6} octahedral symmetry as well as in its coordination.

  20. On the aesthetic features of the bronze ware in the ancient Dian Kingdom%古滇国青铜器的美学特征

    Institute of Scientific and Technical Information of China (English)

    张贺; 卫乐; 余敏

    2012-01-01

    In 1957, the "Emperor Seal of Dian" was unearthed at Shizhai Hill in Jinning county, which confirms the existence of the "Dian Kingdom" in ancient times (Dian being the short form of Yunnan province). The bronze ware in the ancient Dian kingdom is diversified with kingdom per se, her vivid artistic actuality often awakens strong local color. As "Dian" is a mysterious ancient a kind of experiencing memory and imagination and gives us aesthetic enjoyment. The subject matter of the ancient Dian bronze sculpture and adornments are wide - ranging and filled with the flavor of life and life practice is the basis of the lively bold expression and strong viva- cious style of the ancient Dian kingdom bronze art. In the ancient Dian kingdom bronze ware, the organic blend of carving adornments and apparatuses is its unique way of construction. Moreover, the realistic style of the bronze ware art endows it with rhythmic sense and decorative beauty in the density of the arrangement of its layout.%1957年在晋宁石寨山出土了“滇王印”,证实了古代“滇国”的存在,古滇国的青铜器种类十分繁杂,具有浓烈的地方色彩,“滇”本身就是一个神秘的古国,其艺术的生动真实常常唤起一种经历的记忆与想象。给予我们美的享受。古滇青铜雕刻与图饰的题材内容非常广泛,充满了生活气息。生活实践,是古滇国青铜器艺术生动大胆的表现力、强悍灵动风格的基础。在古滇国青铜器中,雕刻图饰与器物是融为一体的,是古滇青铜艺术特有晦构成形式。古滇国青铜器的艺术风格是非常写实的,布局上,疏密节奏的安排赋予韵律感与装饰美。