13 research outputs found
Provenance studies of obsidian artifacts in Anatolia: new data from Agean costal sites
No full textBaklatepe and Limantepe are settlements located along the Aegean coast of Anatolia in the Izmir region. The excavations revealed that these sites have been continuously inhabited since the Late Chalcolit hic up to the Early Byzant ine periods (Baklatepe) and since Neolithic t imes up to the present day (Limantepe) . In this study, 40 obsidian and 6 flint artifacts from the Chalcolithic and Early Bronze Age levels of these sites were investigated with an interdisciplinary approach using fission-track (FT)dating, and Instrumental Neutron Activation Analysis (INAA) techniques.
Based upon thei r FTages the obsidian artifacts were classified in two groups. The main group of 37 samples is characterized by FT ages varying between 148 ± 0.47 and 1.80 ± 0.20 Ma,with a mean value of 1.65 ± 0.05 Ma, and low U content (around 3 ppm) These data allow attributing this group to the Aegean Melos Island obsidian sources. The second group is represented by only 3 samples, characterized by a lower FT age (around 1 Ma) and a significantly higher U content (around 9 ppm). This group was identi fied as origina t ing from the volcaniccomplex (Central Anatolia). INAA studies have been carried out on 33 obsidian artifacts at the TRIGA Mark II research reactor of the University of Pavia following the techniques which have been routinely used by the Radiochemist ry Group. Results fully agree with those obtained with FT dating: most artifa cts originated from the Melos -Demenegaki flow, and only 3 samples from Central Anatolia . INAA analyses of the f lint artifacts revealed that these samples, unsuitable for application of FT dating, can be easily discriminated from the obsidian artifacts based on their chemical prop erties, especially considering the trace elements contents. Compa rison with data obtained on samples from other settlements of Anato lia and Italy proved that INAA is an efficient technique for discriminating flint artifacts originat ing from different sources
Reducing energy usage in a manufacturing facility through a behavior change based approach
No full textThesis (M.B.A.)--Massachusetts Institute of Technology, Sloan School of Management; and, (S.M.)--Massachusetts Institute of Technology, Engineering Systems Division; in conjunction with the Leaders for Global Operations Program at MIT, 2010.Cataloged from PDF version of thesis.Includes bibliographical references (p. 98-100).Many companies have developed energy reduction programs for their manufacturing facilities to reduce their operational costs while also decreasing their greenhouse gas emissions. The majority of these manufacturing facilities have made progress in reducing their energy usage through technology changes, such as purchasing more efficient lighting or replacing old chillers, however, these improvements are often capital intensive. The goal of this thesis is to explore the use of low cost employee behavior changes to help a manufacturing facility reduce its energy usage. The author conducted a six month case study at Raytheon's Integrated Air Defense Center (IADC) in which a new approach for achieving energy related employee behavior changes was implemented. The framework is unique to the author but builds upon lean manufacturing principles, social psychology research, and energy management fundamentals. The approach first raises awareness and engages employees, second, helps employees develop energy saving improvements, and lastly, creates a mechanism to sustain improvements and behavior changes moving forward. The benefits of using such an approach are greater employee engagement (the percentage of employees who participated in a voluntary energy reduction program rose from 38% to 78%), more energy saving ideas being implemented (over 60 employee generated energy saving improvements were implemented on the manufacturing floor), and, ultimately, a reduction in wasted energy. Additionally, a real-time feedback system was designed and installed that provided manufacturing employees with information on their cell's energy usage. This real-time feedback system was developed to help sustain improvements and further enable energy reductions through employee behavior changes. While specific tactics and tools of the applied approach may be unique to Raytheon's IADC facility, the strategy and insights can be universally applied.by Michael A. Norelli, IV.S.M.M.B.A
DATAÇĂO DE VIDRO VULCANICO PELO METODO DO TRACO DE FISSĂO: SOBRE A PREPARAÇĂO DA AMOSTRA E SEU ATAQUE QUIMICO
No full textCritical rhetoric and the issue of drug control: A rhetorical commentary on contemporary discourse in the American war on drugs
No full textThe author analyzes rhetoric that addresses the public policy issue of drug control that identifies groups of people who reportedly constitute the drug problem. Because people rarely experience a body of discourse regarding a single issue at one time, the author assembles discursive fragments to represent a rhetorical text. These include presidential drug war declarations, drug war news stories, Partnership for a Drug-Free America (PDFA) announcements, and first-person recountals of drug addicts. This dissertation assumes a postmodern orientation and a critical rhetoric perspective. A postmodern orientation is appropriate for this work because it provides a realm for scholars to argue for a specific assemblage of discursive fragments, to question the political reality the assembled text seemingly creates, and to look to the discourse of the subjects the text creates to explore the text\u27s influence as the subjects themselves define it. A critical rhetoric perspective empowers scholars to explain discursive fragments that constitute our contemporary experience. Postmodern rhetoric is the contemporary fragmented presentation of messages involved with the preservation of status quo power relations that compete for public acceptance to define public and private realities. As a field of study, it examines discourse that involves issues and issue-related human subjects in ways that support or oppose power/knowledge regimes. Presidential drug war declarations state that drugs threaten all Americans, but are limited primarily to cities. News stories extend presidential articulations and provide examples of independent, minor drug war victories--extending presidential knowledge that drugs constitute a minority problem that minorities can solve without Federal assistance. PDFA messages further extend the idea that the drug problem is limited to Others, or not-white-men: women, children, and Hispanic- and African-Americans. White men only are concerned or victimized individuals. Drug addicts\u27 stories reveal awareness that power/knowledge defines them as Others; however, they recount practices that subvert power/knowledge regime apparatus toward their own ends. The author concludes that the drug problem is a problem not for the powerful who express it, but for the citizens the discourse declares to be enemies, for the people involved in the apparatus that the powerful declare will resolve it, and for Americans who live with the lack of resolutions that emanate from the discursive formations of the drug war. The discursive war on drugs perpetuates a status quo of individuals with discursive power, access to ample financial resources, and the ability to enact policies that empower those who maintain the imbalance in the current state of power relations
Collaborative Scholarship in Academic Library Literature: Who, What, and When
No full textAcademic librarianship is very much concerned with the scholarship of others, but what do we know about the scholarship of librarians? This empirical study examines the relationship between author demographics, article topic, and, in particular, faculty and librarian authorship collaboration in the academic library literature. Extensive data collection facilitated the analysis of trends, correlations, and frequencies. Significant findings were found regarding the number of authors, article type, and paper topic in the context of faculty and librarian authorship collaboration
APATITE FROM AN OLIVINE PYROXENITE OF THE CANAÃ VALLEY, ESPÍRITO SANTO, BRAZIL: FISSION-TRACK AGE DETERMINATION AND CONFINED TRACK LENGTH MEASUREMENTS IN ORDER TO ESTABLISH AN INTERNAL STANDARD
No full textCLASSIFICAÇÃO DE ALGUMAS AMOSTRAS DE TECTITOS DO MUSEU NACIONAL, RIO DE JANEIRO, PELO MÉTODO DE TRAÇOS DE FISSÃO
No full textFISSION-TRACK DATING OF A TEPHRA LAYER IN THE ALAT FORMATION OF THE DANDIERO GROUP (DANAKIL DEPRESSION, ERITREA)
No full textAttempts to date a biotite separate from a tephra layer recognized near Buia (Danakil Depression, Eritrea) in the liwer part of the Homo remains – bearing Dandiero group (formerly attributed to the Danakil Formation) using the 39Ar/40Ar method failed because of xenocrystic contamination. For this reason it was applied the fission-track method on glass, since no other phases datable with this technique were present. The quality of glass was very poor for fission-track dating, because of the small size of grains. In addition, after polishing only few glass shards showed useful surfaces for track counting and only 25 spontaneous tracks were counted. The determined fission-track age - 0.75 +/- 0.16 Ma - is a rejuvenated age due to the presence of a certain amount of annealing of spontaneous tracks. An attempt to apply the plateau method for correcting this apparent age failed. A corrected age of 1.3 +/- 0.3 Ma was computed using the size-correction method. In spite of its low precision, this fission-track age represents a significant result, since it corroborates the attribution to Jaramillo Subchron of the normal magnetozone near the base of which the tephra is located
Reutilización de las tumbas en Oaxaca, México. Dimensión Antropológica Vol. 7 Año 3 (1996) mayo-agosto
No full textAcosta, J. R. y J. Romero, Exploraciones en Monte Negro, Oaxaca, México, INAH, serie arqueología (antologías), 1992.Agrinier, R., "The Archaeological Burials at Chiapa de Corzo and their Furniture", en Papers of the New World Archaeological Foundation, vol. 16, New World Archaeological Foundation Provo, 1964.Agrinier, P., "Mound 20, Mirador, Chiapas, México", en Papers of the New World archaeological foundation, vol. 28, New world archaeological foundation, Provo,1970.Arroyo, B., "Enterramientos de Balberta: un sitio en la costa sur de Guatemala", en BAR International series, vol. 559, Oxford, BAR, 1990.Autry, W., Pos Formative burial practices: Valley of Oaxaca, Mexico, MA, Department of Anthropology, University of North Carolina, Chape Hill, 1973.Blanton, R.E., Monte Albán: Settlement Patterns at Ancient Zapotec Capital, Nueva York, Academic Press, 1978.Blanton R.E., S. Kowalewski, G.M. Feinman y J. Appel,"Monte Albán's Hinterland, Part 1: The Prehispanic Settlement Patterns of the Central and Southern Parts of the Valley of Oaxaca, Mexico", en Prehistoric and Human Ecology of the Valley of Oaxaca, núm. 7, Ann Arbor, Museum of Anthropology, University of Michigan, 1982.Borbolla de la, Rubén, “La osamenta humana encontrada en la tumba 7", en Caso (ed.), El tesoro de Monte Albán, Memorias del INAH, vol. III, México, INAH, 1969, pp. 275-324.Caso, Alfonso, El tesoro de Monte Albán; Memorias del Instituto Nacional de Antropología e Historia, III, México, INAH, 1969.Coggins, C., "Comment on Engendering tomb 7 at Monte Albán: Respinning an old Yarn", en Current Anthropology 35(2),1994, p. 153.Drennan, R.D., “Fábrica San José and Middle Formative Society in the Valley of Oaxaca", en Prehistory and Human Ecology of Valley of Oaxaca, vol. 4, Ann Arbor, University of Michigan, 1976.Estrada, B. E., “Funeraria en Chupícuaro, Guanajuato", en Anales del INAH, época 6(3), 1949, pp. 79-84.Feinman, G. M. y L. M. Nicholas, “At The Margins of the Monte Albán state: Settlement Patterns in the Ejutla Valley, Oaxaca, Mexico", en Latin American Antiquity, 1(2), 1990, pp. 16-24.Feinman, G.M. y L.M. Nicholas, "Shell-Ornament Production in Ejutla: Implications for High1and-Coastal Interaction in Ancient Oaxaca", en Ancient Mesoamerica 4(1), 1993, pp. 103-120.Feinman, G. M., L. M. Nicholas y S. Fedick, "Shell Working in Prehispanic Ejutla: Implications for High1and-Coastal Interaction in Ancient Oaxaca", en Mexicon 13,1991, pp. 69-77.Feinman, G. M., L. M. Nicholas y WD. Middleton, "Craft Activities at the Prehispanic Ejutla Site, Oaxaca, Mexico", en Mexicon 15(2),1993, pp. 33-41.Finstein, L.M., "Comment on Engendering Tomb 7 at Monte Albán: Respinning an old Yárn", en Current Anthropology 35(2),1994, p. 155.Flannery, K.V., "Zapotec Warfare: Archaeological Evidence for the Battles of Huitzo and Guiengola", en Flannery (ed.), The Cloud People, Nueva York, Academic Press, 1983, pp. 318-322.Flarnnery, KV y J. Marcus, “An Editorial Opinion on the Mixtec Impact", en Flannery (ed.), The Cloud People, Nueva York, Academic Press, 1983, pp. 277-279.____________, "On the Perils of Political Correct Archaeology", en Current Anthropology 34(4), 1994, pp. 441-442.Gero, J.M., "Comment on Engendering Tomb 7 at Monte Albán: Respinning an old Yarn", en Current Anthropology 35(2), 1994, p. 156.Hammond, N., A. Clark y C. Robin, "Middle Preclassic Buildings and Burials at Cuello, Belize: 1990 Investigations", en Latin American Antiquity 2(4), 1991, pp. 352-363.Joyce, R.A., "On Engendering Monte Albán Tomb 7", en CurrentAnthropology 35(2),1994, p. 157.Klein, C.E, "Comment on Engendering Tomb 7 at Monte Albán: an old Yarn", en Current Anthropology 35(2), 1994, p. 157.Kirchhoff, Paul, "Mesoamérica. Sus límites geográficos, composición étnica y caracteres culturales", en Suplemento de la revista Tlatoani, México, ENAH (original 1943), 1960.Kowalewski, S., "The Archaeological Evidence for Sa'a Yucu', en Flannery (ed.), The Cloud People, Nueva York, Academic Press, 1983, p. 289.Krogman, WM. y Y. M. Iscan, The Human Skeleton in Forensic Medicine, C.C. Thomas, 1986.López, A. S., Zaid Lagunas R. y Carlos Serrano S., Enterramientos humanos de la zona arqueológica de Cholula, Puebla, México, INAH (col. Científica, Antropología Física, vol. 44), 1976.Lovejoy, C.O., R.S. Meindl, TR. Pryzbeck y R.P Mensforth, "Cronological Metamorphosis of the Auricular Surface of the Ilhum: a New Method for Determination of Adult Skeletal Age at Death", en AJPA, 68, 1985, pp. 15-28.Lowe, G.W y R Agrinier, "Mound 1, Chiapa de Corzo, Chiapas, Mexico", en Papers of the New World Archaeological Foundation, vol. 8, Provo, New World Archaeological Foundation, 1960.Mason, J.A., "Mound 12, Chiapa de Corzo, Chiapas, Mexico", en Papers of the New World Archaeological Foundation, vol. 9, Provo, New Worid Archaeological Foundation, 1960.McCafferty S.D. y G.G. McCafferty Engendering Tomb 7 at Monte Albán: Respinning an old Yárn", en Current Anthropology 35(2),1994, pp. 143-166.McKeever-Furts, J.L., "Comment on Engendering Tomb 7 at Monte Albán: Respinning an old Yárn", en Current Anthropology 35(2), 1994, p. 158.Meindl, S.R., C.O. Lovejoy, R.P Mensforth y R.A. Walker, “A Revised Method of Age Determination Using the Os Pubis, with a Review and Tests of Accuracy of Other Current Methods of Pubic Symphyseal Aging", en AJPa, 68, 1985, pp. 29-45.Middlenton, WD., "Patterns of faunal exploitation at the Ejutla site, Oaxaca, Mexico", en Paper Presented at the Midwest Mesoamericanists Meeting, Loyola University, 1994.Monzón, M., Casas prehispánicas en Teotihuacan, México, UNAM, 1989.Morales de, M. M., "The Chalcatzingo burials", en Grove (ed.), Ancient Chalcatzingo, Austin, University of Texas Press, 1987.Müller, E, "Entierro radial de Tulancingo, Hidalgo", en Cuaderno de Trabajo, Departamento de Salvamento Arqueológico, vol. 1, INAH, 1986.Robin, C., "Preclassic Maya burials at Cuelo, Belize", en BAR International Series, vol. 480, Oxford, BAR, 1989.Romano, A., “Sistemas de enterramientos", en Romero (coord.), Bernal (ed.), Antropología física: época prehispánica, Panorama histórico y cultural, III, México, SEP-INAH, 1974.Ruz L., A., "Tombs and Funerary Practices in the Maya Lowlands", en Willy (ed.), Archaeology of Southern Mesoamerica: Part one, pp. 441-461.Séjourné, L., "El simbolismo de los rituales funerarios en Monte Albán", en Paper Presented at the VII Mesa Redonda de la SMA, 1957, México, 1960.Sempowski, M.L. y M.W Spence, Mortuary Practices and Skeletal Reinains at Teotihuacan, Salt Lake City, University of Utah Press, 1994.Serrano, C. y Z. Lagunas, "Sistema de enterramientos y notas sobre el material osteológico de la Ventilla, Teotihuacan, México", en Anales del INAH, época 7a, IV, 1974, pp. 105-144.Suárez, C. S., "Un entierro del Clásico superior en Cholula, Puebla", en Cuaderno de Trabajo 6, México, Centro Regional de Puebla INAH, 1985.Welsh, W. B. M., “Analysis of Classic Lowland Maya Burials", en BAR International Series, vol. 409, Oxford, BAR International, 1988.Whalen, M.E., "Exacavations at Santo Domingo Tomaltepec: Evolution of a Formative Community in the Valley of Oaxaca", en Museum of Anthropology 6, Ann Arbor, University of Michigan, 1981.White, T. D. y P. A. Folkens, Human Osteology, San DiegoAcademic Press, 1991.Wilkinson, R.G. y R.J. Norelli, “A Biocultural Analysis of Social Organization at Monte Albán", en American Antiquity 46(4),1981, pp. 743-758.Winter, M. y C. M. López, "On Engendering Monte Albán Tomb 7”, en Current Anthropology 35(3), 1994, p. 286.Winter, C.M., "Rescate arqueológico en Loma del Mesquite, San Pablo, Huitzo, Etla, Oaxaca", en Estudios de Antropología e Historia 39, Oaxaca, CRO, INAH, 1984.El presente artículo describe una tumba excavada recientemente en Ejutla, Oaxaca. En el uso de la tumba aparecen al menos cinco entierros secuenciales, reflejando lo que llamamos “reutilización continua” de las tumbas. Basados en este término nosotros sugerimos que: la práctica de la reutilización fue más común en Mesoamérica de lo que se ha sospechado hasta ahora. La consideración de esta tercera alternativa de la dicotomía entierro primario/secundario proporciona una nueva perspectiva para evaluar el ensamble esquelético de la tumba 7
Effect of Combined Leukocyte-Poor Platelet-Rich Plasma and Hyaluronic Acid on Bone Marrow–Derived Mesenchymal Stem Cell and Chondrocyte Metabolism
No full text© The Author(s) 2019. Objective: Given the potential applications of combined biologics, the authors sought to evaluate the in vitro effect of combined platelet-rich plasma (PRP) and hyaluronic acid (HA) on cellular metabolism. Design: Bone marrow–derived mesenchymal stem cells (BMSCs) and chondrocytes were obtained from the femurs of Sprague-Dawley rats. An inflammatory model was created by adding 10 ng/mL interleukin-1-beta to culture media. Non-crosslinked high-molecular-weight HA, activated-PRP (aPRP), and unactivated-PRP (uPRP) were tested. Cellular proliferation and gene expression were measured at 1 week. Genes of interest included aggrecan, matrix metalloproteinase (MMP)-9, and MMP-13. Results: Combined uPRP-HA was associated with a significant increase in chondrocyte and BMSC proliferation at numerous preparations. There was a trend of increased chondrocyte aggrecan expression with combined PRP-HA. The greatest and only significant decrease in BMSC MMP-9 expression was observed with combined PRP-HA. While a significant reduction of BMSC MMP-13 expression was seen with PRP and HA-alone, a greater reduction was observed with PRP-HA. MMP-9 chondrocyte expression was significantly reduced in cells treated with PRP-HA. PRP-alone and HA-alone at identical concentrations did not result in a significant reduction. The greatest reduction of MMP-13 chondrocyte expression was observed in chondrocytes plus combined PRP-HA. Conclusions: We demonstrated a statistically significant increase in BMSC and chondrocyte proliferation and decreased expression of catabolic enzymes with combined PRP-HA. These results demonstrate the additive in vitro effect of combined PRP-HA to stimulate cellular growth, restore components of the articular extracellular matrix, and reduce inflammation
