76,744 research outputs found
Chan An Ancient Maya Farming Community
No full textThe farming community of Chan thrived for over twenty centuries, surpassing the longevity of many larger Maya urban centers. Between 800 BC and 1200 AD it was a major food production center, and this collection of essays reveals the important role played by Maya farmers in the development of ancient Maya society. Chan offers a synthesis of compelling and groundbreaking discoveries gathered over ten years of research at this one archaeological site in Belize. The contributors develop three central themes, which structure the book. They examine how sustainable farming practices maintained the surrounding forest, allowing the community to exist for two millennia. They trace the origins of elite Maya state religion to the complex religious belief system developed in small communities such as Chan. Finally, they describe how the group-focused political strategies employed by local leaders differed from the highly hierarchical strategies of the Classic Maya kings in their large cities. In breadth, methodology, and findings, this volume scales new heights in the study of Maya society and culture.Cover -- Title -- Copyright -- Contents -- List of Figures -- List of Tables -- Foreword -- Acknowledgments -- 1. Introducing the Chan Site: Farmers in Complex Societies -- Part 1. Time, Space, and Landscapes -- 2. A Changing Cultural Landscape: Settlement Survey and GIS at Chan -- 3. Ceramics and Chronology at Chan -- 4. Agricultural Practices at Chan: Farming and Political Economy in an Ancient Maya Community -- 5. Agroforestry and Agricultural Production of the Ancient Maya at Chan -- Part 2. Life in a Farming Community Center -- 6. Ritual in a Farming Community -- 7. Nonroyal Governance at Chan's Community Center -- 8. "Empty" Spaces and Public Places: A Microscopic View of Chan's Late Classic West Plaza -- Part 3. Diversity across the Chan Community -- 9. Recognizing Difference in Small-Scale Settings: An Examination of Social Identity Formation at the Northeast Group, Chan -- 10. Organization of Chert Tool Economy during the Late and Terminal Classic Periods at Chan: Preliminary Thoughts Based upon Debitage Analyses -- 11. Limestone Quarrying and Household Organization at Chan -- Part 4. Bodies, Material Culture, and Meaning -- 12. The Chan Community: A Bioarchaeological Perspective -- 13. Creating Community with Shell -- 14. Obsidian Acquisition, Trade, and Regional Interaction at Chan -- 15. Contextualizing Ritual Behavior: Caches, Burials, and Problematical Deposits from Chan's Community Center -- Part 5. Conclusion -- 16. Learning from an Ancient Maya Farming Community -- References -- List of Contributors -- Index -- A -- B -- C -- D -- E -- F -- G -- H -- I -- J -- K -- L -- M -- N -- O -- P -- Q -- R -- S -- T -- V -- W -- X -- YThe farming community of Chan thrived for over twenty centuries, surpassing the longevity of many larger Maya urban centers. Between 800 BC and 1200 AD it was a major food production center, and this collection of essays reveals the important role played by Maya farmers in the development of ancient Maya society. Chan offers a synthesis of compelling and groundbreaking discoveries gathered over ten years of research at this one archaeological site in Belize. The contributors develop three central themes, which structure the book. They examine how sustainable farming practices maintained the surrounding forest, allowing the community to exist for two millennia. They trace the origins of elite Maya state religion to the complex religious belief system developed in small communities such as Chan. Finally, they describe how the group-focused political strategies employed by local leaders differed from the highly hierarchical strategies of the Classic Maya kings in their large cities. In breadth, methodology, and findings, this volume scales new heights in the study of Maya society and culture.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
Elevational range size and climatic variaiblity. Chan et al.
No full textData for reproducing the results published in Chan, W.-P., Chen, I.-C., Colwell, R.K., Liu, W.-C., Huang, C.-y. & Shen, S.-F. (2016) Seasonal and daily climate variation have opposite effects on species elevational range size. Science, 351, 1437-1439
O pułapce „skojarzeniowej” w humanistyce. (Na marginesie uroszczenia S. Gałkowskiego w jego próbie „logicznej” wykładni Znanieckiego)
No full textAutor polemiki we wstępie wskazuje na zjawisko "reductio ad absurdum" koncepcji Znanieckiego w wykładni adresata jego krytyki. Dalej jest zarysowana ogólna perspektywa sprzeciwu wobec podejścia Stanisława Gałkowskiego. Przedstawiono także krytycyzm i pochwały wobec Znanieckiego ze strony autora polemiki. W tekście wskazuje się na pułapkę czytania epistemicznego jako etyczne nadużycie logiki. Wreszcie, zamiast zakończenia, mówi się o traktowaniu tradycji myśli humanistycznej i uczula na błędy interpretacyjne popełnione przez krytykowanego autora. Główny błąd polega na skojarzeniach czytelnika blokujących mu głębszy dostęp do znaczenia czytanej koncepcji.In his introduction the author of this polemic indicates the phenomenon of "reductio ad absurdum" of Znaniecki's conception in the exegesis of the addressee of this criticism. Next there is an outline sketched concerning the general perspective of disagreement against the approach by S. Gałkowski. There is also outlined criticism and appraisal towards Znaniecki by the author of this polemics. The text illustrates the trap of an epistemic reading as an ethical abuse of logics. Finally instead of a conclusion one is discussing the ways of treatement of the tradition of humanistic reflection and it warns against interpretative errors committed by the criticised author. The basic error is perceived as the result of domination of application of harmful associations of the leader blocking the way to deeper sense of the conception
Coulter, Chan L., June 17, 1996 [Interview]
No full textProfessor of Philosophy Chan L. Coulter was interviewed on June 17, 1996, by Michael Birkner and David Hedrick about his childhood, his education, his time as an ROTC instructor, and aspects of his career at Gettysburg College.Clouse, Danner; Richardson, Norman E.; Schubart, W. Richard; Portmess, Lisa; Glassick, Charles E.; Holder, Leonard I.; Potts, David B.; Paul, Willard S.; Hanson, C. ArnoldWillard S. Paul Years; Carl Arnold Hanson Years; Charles E. Glassick Years; Gordon A. Haaland Year
Principled Criminal Law Reform: Could Macaulay Survive the Age of Governing through Crime? Reflections from the Floor
No full textChan W.C.,Wright B. & Yeo S.</p
Novel gadolinium(III) polyaminocarboxylate macrocyclic complexes as potential magnetic resonance imaging contrast agents
No full textTwo novel Gd(III) complexes with functionalised polyaminocarboxylate macrocycles, 1,4,7-tris(carboxymethyl)-9,24-dioxo-14,19-dioxa-1,4,7,10,23- pentaazacyclododecane (L 1) and 1,4,7-tris(carboxymethyl)-9,25-dioxo- 14,17,20-trioxa-1,4,7,10,23- pentaazacyclotridecane (L 2), were prepared in good yield. Their potential use as magnetic resonance imaging (MRI) contrast agents (CAs) was evaluated by investigating their relaxation behaviour as a function of pH, temperature and magnetic field strength. The 1/T 1 proton relaxivities at 20 MHz and 25°C of GdL 1 (5.87 mM -1 s -1) and GdL 2 (6.14 mM -1 s -1) were found to be significantly higher than the clinically used Gd 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (Gd(DOTA) -) and Gd diethylenetriaminepentaethanoic acid (Gd(DTPA) 2-). The complexes possess one water molecule in the inner coordination sphere whose mean residence lifetime was estimated to be 1.1 and 1.5 μs at 25°C by variable temperature (VT) 17O NMR spectroscopy. © 2004 Elsevier Inc. All rights reserved.link_to_subscribed_fulltex
Coulter, Chan L., July 23, 1996 [Interview]
No full textProfessor of Philosophy Chan L. Coulter was interviewed on June 17, 1996, by Michael Birkner and David Hedrick about his career at Gettysburg College, including memorable colleagues, classes, and controversies.Dunn, Seymour B.; Glatfelter, Charles H.; Hanson, C. Arnold; Crapster, Basil L.; Barnes, Robert D.; Baskerville, Edward J.; Mara, Richard T.; Qually, Ingolf; Bugbee, Bruce W.; Richardson, Norman E.; Bolich, Harry F.; Arms, Richard A.; Mason, Francis C.; Taylor, Kathrine Kressmann; Schmidt, Emile O.; Glassick, Charles E.; Potts, David B.Willard S. Paul Years; Carl Arnold Hanson Years; Charles E. Glassick Years; Gordon A. Haaland Year
Replication Data for: Spatial microsimulation of carbon tax incidence: An application to Washington State
No full textContains the code and data files needed to replicate the analysis in Nathan W. Chan and Susan S. Sayre "Spatial microsimulation of carbon tax incidence: An application to Washington State
Differences in Radiative Forcing, Not Sensitivity, Explain Differences in Summertime Land Temperature Variance Change Between CMIP5 and CMIP6
No full text© The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Chan, D., Rigden, A., Proctor, J., Chan, P. W., & Huybers, P. Differences in radiative forcing, not sensitivity, explain differences in summertime land temperature variance change between CMIP5 and CMIP6. Earth’s Future, 10(2), (2022): e2021EF002402, https://doi.org/10.1029/2021EF002402.How summertime temperature variability will change with warming has important implications for climate adaptation and mitigation. CMIP5 simulations indicate a compound risk of extreme hot temperatures in western Europe from both warming and increasing temperature variance. CMIP6 simulations, however, indicate only a moderate increase in temperature variance that does not covary with warming. To explore this intergenerational discrepancy in CMIP results, we decompose changes in monthly temperature variance into those arising from changes in sensitivity to forcing and changes in forcing variance. Across models, sensitivity increases with local warming in both CMIP5 and CMIP6 at an average rate of 5.7 ([3.7, 7.9]; 95% c.i.) × 10−3°C per W m−2 per °C warming. We use a simple model of moist surface energetics to explain increased sensitivity as a consequence of greater atmospheric demand (∼70%) and drier soil (∼40%) that is partially offset by the Planck feedback (∼−10%). Conversely, forcing variance is stable in CMIP5 but decreases with warming in CMIP6 at an average rate of −21 ([−28, −15]; 95% c.i.) W2 m−4 per °C warming. We examine scaling relationships with mean cloud fraction and find that mean forcing variance decreases with decreasing cloud fraction at twice the rate in CMIP6 than CMIP5. The stability of CMIP6 temperature variance is, thus, a consequence of offsetting changes in sensitivity and forcing variance. Further work to determine which models and generations of CMIP simulations better represent changes in cloud radiative forcing is important for assessing risks associated with increased temperature variance.This study was supported by the Harvard Global Institute and NSF (Award 1903657). D. Chan was also supported by the Woods Hole Oceanographic Institute Weston Howland Jr. Postdoctoral Fellowship
Resource Management for Advanced Transmission Antenna Satellites
No full textIn satellite communications, narrow spotbeams can provide high power and data rates to the desired location while reducing spatial interference. Advanced transmission antenna technology is critical to generate and switch narrow beams rapidly among a large number of users under quality of service (QoS) constraints such as average delay. In this paper, we jointly optimize resource allocation and congestion control, and compare the performances of two types of satellite transmit antennas: a multiple beam antenna and a phased array antenna. For a multiple beam antenna with traveling wave tube amplifiers (TWTA), throughput is decided by either the most demanding user or the average of all user parameters. For a phased array antenna, joint antenna gain patterning and beam scheduling is given as a function of channel conditions, interference (depending on users' geographical distribution), and average delay requirements. We then develop a low-complexity on-line algorithm of choosing either interference suppression or sequential service for the active users who are closely located within the width of a spotbeam. Due to flexible power allocation, the phased array antenna can provide better performance than the multiple beam antenna when a small number of users are very demanding or many users are densely crowded in a small area.
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