WorldWideScience

Sample records for circle cliffs deposit

  1. CIRCLES

    Institute of Scientific and Technical Information of China (English)

    王雷

    2008-01-01

    <正>A circle is a set of points in the xy- plane that hare a fixed distance r from a fixed point(h,k).The fixed distance r is called the radius,and the fixed point (h,k)is called the center of the circle.

  2. Recent Atmospheric Deposition and its Effects on Sandstone Cliffs in Bohemian Switzerland National Park, Czech Republic

    Czech Academy of Sciences Publication Activity Database

    Vařilová, Z.; Navrátil, Tomáš; Dobešová, Irena

    2011-01-01

    Roč. 220, 1/4 (2011), s. 117-130. ISSN 0049-6979 Institutional research plan: CEZ:AV0Z30130516 Keywords : acid deposition * sandstone percolates * chemical weathering * salt efflorescence * Black Triangle * aluminum * sulfates Subject RIV: DD - Geochemistry Impact factor: 1.625, year: 2011

  3. Remembering Cliff Swartz

    Science.gov (United States)

    Graf, Erlend H.

    2011-01-01

    In recalling my 40-year friendship with Cliff Swartz, there are naturally a great many interesting anecdotes I could relate. But as amusing or poignant as they might be, they would tend to be rather disjointed—you could never tell what Cliff might do or think of next—without some overarching theme. Accordingly, since this is a magazine about teaching physics, I will concentrate on Cliff's teaching style and some of the many devices he used to enhance it.

  4. Cliffs User Manual

    CERN Document Server

    Tolkova, Elena

    2014-01-01

    Cliffs is an open-source relative of MOST (Method Of Splitting Tsunamis) numerical model, implemented as described in (Tolkova, 2014, Pure and Appl. Geophys., 171(9), 2289-2314). Cliffs features: Shallow-Water approximation with an option to manipulate numerical dispersion; Use of Cartesian or spherical (lon/lat) coordinates; 1D and 2D configurations; Structured co-located grid with (optionally) varying spacing; Runup on land; Initial conditions or boundary forcing; Grid nesting with one-way coupling; Parallelized with OpenMP; NetCDF format of input/output data. This user manual accompanies Cliffs code distribution.

  5. Study of cliff shoreline erosion

    OpenAIRE

    Gomez-Pina, Gregorio; Muñoz-Perez, Juan J.; Figueres, Miguel; Garrido, Joaquin; Ponce de León, Daniel; Perez, Angela; Velasco, Marta; Lizondo, Susana

    2012-01-01

    In this paper the cliff shoreline erosion on the coastline between Punta Montijo and the Chipiona Port (Cadiz, Spain) is studied. The reasons which cause this erosive phenomenon and the future erosive tendency of these cliffs are estimated, obtaining magnitudes of recession and the rate at which it will occur. Analysis of the current situation has been carried out by determining its plan shape, the study of the theoretical erosion profile of the cliffs and the verification of their failure. T...

  6. Cliffs at Gruchy

    Directory of Open Access Journals (Sweden)

    David Middleton

    2005-01-01

    Full Text Available Downward from Gruchy, past its wind-wrenched elm,The path drops under pastures to a cliffWhere outcrop boulder-stones glint blue and iron,Breaking above great sweeps of sea and sky.Below the rocks, rowing in close to shoreThe fishermen, no bigger than the gullsThat turn above them crying at their catch,Glide over green and lavender to sand.Outside the scene, a higher, flatter rockProvided the perspective for these stonesThat point toward the horizon’s shining line,Insight’s limitless limit bo...

  7. White Cliffs: Operating Experience

    Science.gov (United States)

    Kaneff, S.

    1984-01-01

    The fourteen dish white cliffs solar power station area is remote and subject to extreme environmental conditions, solution of the associated problems required careful and thoughtful attention and the application of resources. Notwithstanding the wide range and harshness of conditions, the difficulties caused by remoteness and the lack of a technological base and the need for relatively rapid demonstration of success, the project has had a very positive outcome. Qualitative and quantitative information and lessons are now available to enable considerable simplifications to be made for a new system, reducing both hardware and operation and maintenance costs. Experience and lessons are presented, particularly in relation to: system performance in various environmental conditions; design philosophies for collectors, the array, control systems, engine and plant; operation and maintenance strategies and cost reducing possibilities. Experience so far gives encouragement for the future of such paraboloidal dish systems in appropriate areas.

  8. Research circles

    DEFF Research Database (Denmark)

    Nordentoft, Helle Merete; Thomsen, Rie; Möller, Jonas;

    lifelong guidance policies. This paper presents `research circles´ as a way to develop guidance practices through long-term research relationships between practice and research. Research circles support a bottom up approach to policy development just like ELGPN considers to be necessary and required in...... career guidance development. In the paper we draw on the preliminary findings from an ongoing Nordic project: “The future of career guidance and educational counselling”. Specifically, we explore the career guidance practitioners´ response to research circles as means to professional development. We...... argue that this practicebased way of organizing research facilitates learning, and potentially, qualifies practice. The collaboration between researchers and practitioners in the research circle fosters a joint venture and an academic perspective on practice, which stimulates practitioners to step out...

  9. River response to climate and sea level changes during the Late Saalian/Early Eemian in northern Poland – a case study of meandering river deposits in the Chłapowo cliff section

    Directory of Open Access Journals (Sweden)

    Moskalewicz Damian

    2016-03-01

    Full Text Available Fluvial sediments in the Chłapowo cliff section were studied in order to reconstruct their palaeoflow conditions and stratigraphical position. Lithofacies, textural and palaeohydraulic analyses as well as luminescence dating were performed so as to achieve the aim of study. Sedimentary successions were identified as a record of point bar cycles. The fluvial environment probably functioned during the latest Saalian, shortly after the retreat of the Scandinavian Ice Sheet. Discharge outflow was directed to the northwest. The river used the older fluvioglacial valley and probably was directly connected to the Eem Sea. Good preservation and strong aggradation of point-bar cycles were related to a rapid relative base level rise. The meandering river sediments recognised showed responses to climate and sea level changes as illustrated by stratigraphical, morphological and sedimentological features of the strata described. The present study also revealed several insights into proper interpretation of meandering fluvial successions, in which the most important were: specific lithofacies assemblage of GSt (St, Sp → Sl → SFrc → Fm (SFr and related architectural elements: channel/sandy bedforms CH/SB → lateral accretion deposits LA → floodplain fines with crevasse splays FF (CS; upward-fining grain size and decreasing content of denser heavy minerals; estimated low-energy flow regime with a mean depth of 1.6–3.3 m, a Froude number of 0.2–0.4 and a sinuosity of 1.5.

  10. River response to climate and sea level changes during the Late Saalian/Early Eemian in northern Poland - a case study of meandering river deposits in the Chłapowo cliff section

    Science.gov (United States)

    Moskalewicz, Damian; Sokołowski, Robert J.; Fedorowicz, Stanisław

    2016-03-01

    Fluvial sediments in the Chłapowo cliff section were studied in order to reconstruct their palaeoflow conditions and stratigraphical position. Lithofacies, textural and palaeohydraulic analyses as well as luminescence dating were performed so as to achieve the aim of study. Sedimentary successions were identified as a record of point bar cycles. The fluvial environment probably functioned during the latest Saalian, shortly after the retreat of the Scandinavian Ice Sheet. Discharge outflow was directed to the northwest. The river used the older fluvioglacial valley and probably was directly connected to the Eem Sea. Good preservation and strong aggradation of point-bar cycles were related to a rapid relative base level rise. The meandering river sediments recognised showed responses to climate and sea level changes as illustrated by stratigraphical, morphological and sedimentological features of the strata described. The present study also revealed several insights into proper interpretation of meandering fluvial successions, in which the most important were: specific lithofacies assemblage of GSt (St, Sp) → Sl → SFrc → Fm (SFr) and related architectural elements: channel/sandy bedforms CH/SB → lateral accretion deposits LA → floodplain fines with crevasse splays FF (CS); upward-fining grain size and decreasing content of denser heavy minerals; estimated low-energy flow regime with a mean depth of 1.6-3.3 m, a Froude number of 0.2-0.4 and a sinuosity of 1.5.

  11. Small circles

    DEFF Research Database (Denmark)

    Ling, Richard; Bjelland, Johannes; Sundsøy, Pål;

    2014-01-01

    This article examines how we use mobile telephony to maintain our physically and socially closest social circle. The analysis is based on traffic data gathered from Norway using approximately 24 million calls and texts made by private individuals. Previous research has shown that our temporal and...

  12. Lessons learned at Calvert Cliffs

    Energy Technology Data Exchange (ETDEWEB)

    Lawrence, C.C. III (Baltimore Gas and Electric Co.); Graf, D.V.; Honey, J.A.

    1976-01-01

    Initial operation of the Calvert Cliffs-1 Reactor yielded significant reliability information in the following areas: circulating water system, primary system valve leakage, steam generator blowdown recovery, spare parts availability, breathing air systems, primary system water chemistry, secondary system water chemistry, RPS/ESFAS interactions, in-core detectors, and computer trending.

  13. CliffsQuickReview Physics

    Science.gov (United States)

    Huetinck, Linda; Ph., D.; Adams, Scott

    2001-06-01

    CliffsQuickReview course guides cover the essentials of your toughest subjects. Get a firm grip on core concepts and key material, and test your newfound knowledge with review questions. Whether you need a course supplement, help preparing for a physics exam, or a concise reference for physics, CliffsQuickReview Physics can help. This guide provides a valuable introduction to the concepts of classical mechanics, thermodynamics, magnetism, and electricity. In no time, you'll be ready to tackle other concepts in this book such as Wave motion and sound Current and resistance Electromagnetic induction Geometrical optics Nuclear physics Quantum mechanics CliffsQuickReview Physics acts as a supplement to your other learning material. Use this reference in any way that fits your personal style for study and review -- you decide what works best with your needs. You can flip through the book until you find what you're looking for -- it's organized to gradually build on key concepts. Or, here are just a few other ways you can search for topics: Use the free Pocket Guide full of essential information Get a glimpse of what you'll gain from a chapter by reading through the Chapter Check-In at the beginning of each chapter Use the Chapter Checkout at the end of each chapter to gauge your grasp of the important information you need to know Test your knowledge more completely in the CQR Review and look for additional sources of information in the CQR Resource Center Use the glossary to find key terms fast. With titles available for all the most popular high school and college courses, CliffsQuickReview guides are a comprehensive resource that can help you get the best possible grades.

  14. Development of cliff-top dunes in the Hengchun Peninsula of the southern Taiwan

    Science.gov (United States)

    Ho, Lih-Der; Wong, Yi-Chia; Lüthgens, Christopher; Chyi, Shyhjeng; Yen, Jiun-Yee

    2016-04-01

    Fung-Chuei-Sha cliff-top dune is located on a 60-meter-high cliff surface in the Hengchun Peninsula of Taiwan. It is still unclear that the history of the aeolian sediment deposition on the top of the cliff, and what factors may influence the evolution of the cliff-top dune. This study aims to investigate the evolutionary history of the Fung-Chuei-Sha cliff-top dune by analyzing the grain size, CaCO3 concentration and absolute dates of the dune sediment, and the land snail species found in the deposit.The results show three phases of aeolian sand accumulation in the Fung-Chuei-Sha cliff-top dune. 1. Phase I: aeolian sediment may accumulate in the bottom of the cliff between 2800 yr BP and 2100 yr BP. 2. Phase II: the cliff-top dune accumulated a 3.1-meter-thick sediment layer from 1500 yr BP to 1300 yr BP. In this phase, dune sediment deposited in a rate of 1.55 cm/yr. The paleoclimate proxy data from the nearby area indicate that the environment was cool and dry, and the Asian winter monsoon was strong during 1500-1300 yr BP. It blew the old coastal dune deposit at the bottom of the cliff up to the cliff top, and induced the C14 age reverse phenomenon. The aeolian deposition began to stabilize because of the wetter environment in the end of the Phase II. At the same time, the stable dune formed the silt and clay layer on the surface of the dune. A layer cemented by CaCO3 may indicate the position of the palaeo-groundwater table. 3. Phase III: the phase stared from 1500-1300 yr BP to the present. A 2.4-meter-thick eolian deposit was accumulated in a rate of 0.18 cm/yr during this phase. Four kinds of land snail shells, Cyclophorus formosensis, Hemiphaedusa similaris, Platyrhaphe swinhoei, Odontartemon heudei, which prefer to live in a relatively humid environment, were commonly observed in the dune deposit, indicating the environment was wet and consequently caused a slower aeolian deposition rate at this phase. Between 1000 yr BP and 500 yr BP, there was a

  15. 76 FR 4391 - Calvert Cliffs Nuclear Power Plant, LLC, Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2...

    Science.gov (United States)

    2011-01-25

    ... COMMISSION Calvert Cliffs Nuclear Power Plant, LLC, Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2; Exemption 1.0 Background Calvert Cliffs Nuclear Power Plant, LLC, the licensee, is the holder of Facility Operating License Nos. DPR-53 and DPR-69 which authorizes operation of the Calvert Cliffs Nuclear...

  16. 76 FR 1469 - Calvert Cliffs Nuclear Power Plant, LLC; Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2...

    Science.gov (United States)

    2011-01-10

    ... COMMISSION Calvert Cliffs Nuclear Power Plant, LLC; Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2... Cliffs Nuclear Power Plant, LLC, the licensee, for operation of the Calvert Cliffs Nuclear Power Plant... for light-water nuclear power reactors,'' which requires that the calculated emergency core...

  17. 76 FR 39908 - Calvert Cliffs Nuclear Power Plant, LLC; Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2...

    Science.gov (United States)

    2011-07-07

    ... COMMISSION Calvert Cliffs Nuclear Power Plant, LLC; Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2.... DPR-53 and DPR-69, for the Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2 (CCNPP), respectively... (ISFSI), currently held by Calvert Cliffs Nuclear Power Plant, LLC as owner and licensed...

  18. 75 FR 66802 - Calvert Cliffs Nuclear Power Plant, LLC; Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2...

    Science.gov (United States)

    2010-10-29

    ... COMMISSION Calvert Cliffs Nuclear Power Plant, LLC; Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2... Regulatory Commission (the Commission) has granted the request of Calvert Cliffs Nuclear Power Plant, LLC... Operating License Nos. DPR-53 and DPR-69 for the Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and...

  19. A contrasting study: cliff and bank swallows

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The purpose of the project was to contrast as population of Cliff Swallows and a population of Bank Swallows. Both populations had nests located in a gravel pit...

  20. CliffsNotes Statistics Quick Review

    CERN Document Server

    Voelker, David H; Adams, Scott

    2011-01-01

    Inside the Book: Graphic displays Numerical measures Probability Sampling Principles of testing Univariate inferential tests Bivariate relationships Review questions Resource center Glossary Common mistakes Tables Why CliffsNotes? Go with the name you know and trust Get the information you need-fast! CliffsNotes Quick Review guides give you a clear, concise, easy-to-use review of the basics. Introducing each topic, defining key terms, and carefully walking you through sample problems, this guide helps you grasp and understand the important concepts needed to succeed. Access 500

  1. 2012 Cliff Weiss Memorial Essay Contest Winners

    Science.gov (United States)

    Techniques: Connecting Education and Careers (J3), 2012

    2012-01-01

    This article presents the winners of the 2012 Cliff Weiss Memorial Essay Contest. They are Naim Owens from Washington, DC, and Colissa Menke from Warrensburg, Missouri. The 2012 essay topic is "How do you feel CTE prepares individuals, including yourself, for a future career?"

  2. Comprehensive knowledge base of two- and three-dimensional activity cliffs for medicinal and computational chemistry [v1; ref status: indexed, http://f1000r.es/5ir

    Directory of Open Access Journals (Sweden)

    Ye Hu

    2015-06-01

    Full Text Available Activity cliffs are formed by pairs or groups of structurally similar or analogous active compounds with large differences in potency. They can be defined in two or three dimensions by comparing graph-based molecular representations or compound binding modes, respectively. Through systematic analysis of publicly available compound activity data and ligand-target X-ray structures we have in a series of studies determined all currently available two- and three-dimensional activity cliffs (2D- and 3D-cliffs, respectively. Furthermore, we have systematically searched for 2D extensions of 3D-cliffs. Herein, we specify different categories of activity cliffs we have explored and introduce an open access data deposition in ZENODO (doi: 10.5281/zenodo.18490 that makes the entire knowledge base of current activity cliffs freely available in an organized form.

  3. Technological kinship circles

    OpenAIRE

    Camilo Mejía Moncayo; David Fernando Lara Sepúlveda; Ernesto Córdoba Nieto

    2010-01-01

    This document describes a graphic group technology-based methodology for defining a new layout for an industrial production plant. This methodology (technological kinship circles) sought to optimise an industrial plant’s physical resources and minimise its production lead time through a new layout (i.e. an improvement and standardisation system) (Lara, 2007). The technological kinship circles methodology arose from the need for integrating manufacturing cells with defining their layout; ...

  4. Vertical cliff surveys with a phoswich

    International Nuclear Information System (INIS)

    A prototype backpack-portable phoswich detector system developed by Umbarger and Wolf, micro-R meters, and standard mountaineering techniques were used to survey 20m (60 ft) high cliff faces in the effluent outfall area of a former treatment plant for transuranic and fission product waste from the Los Alamos Scientific Laboratory. Selection of the phoswich system was based on the requirement to use the most sensitive survey meter system available to monitor for transuranics. Standard techniques for descending a fixed rope (considered to be the most practical and probably safest method) permitted ready access to all portions of the cliff face to determine the extent, if any, of residual contamination. This paper provides a brief summary of the characteristics and detection limits of the ruggedized phoswich system, and the survey methods used. (author)

  5. Origin of caves and notches observed on the Antalya Tufa Cliffs

    Science.gov (United States)

    Dipova, Nihat; Emine Sukran, Okudan; Uzunsakal, Levent

    2010-05-01

    This study aims the investigation of caves and notches observed on the Antalya tufa cliffs from the geological, biological and morphological points of view. Through observations, sampling and measurements on the 13 km long Antalya cliffs, geological and biological definitions have been made. Through topographical surveys morphology of caves have been determined. The caves on Antalya tufa cliffs are of three origin; 1) The sea caves occurred due to wave action on weak parts of the tufa, 2) The flank margin caves occurred due to mixing corrosion, 3) The caves occurred as blind holes behind tufa curtains which deposited on tufa cascade environment of deposition. In this study more attention has been paid on porosity development and related cave formation due to mixing corrosion. The mixing corrosion is a process in which mixed water dissolves calcium carbonate rock where groundwater and sea water interfere. Cavities which occur in this process can join together and form big chambers. When rock load on this chambers exceeds rocks strength, the roof may collapse and fall into the chamber. This fallen block is also subject to further dissolution resulting in enlargement of the cave. The idea that the flank margin caves have been formed on Antalya cliffs due to mixing corrosion have been proven making in-situ water chemistry tests. Entrances of the caves on the cliffs are concentrated between present sea level and 5 m below this level. Similarly, on the sea level caves depth of the caves is around 5 m. Starting from a time of constant sea level, and following sea level rise, mixing corrosion and flank margin cave development should have been continued. Formation of notches on the Antalya tufa cliffs should have been affected by wave direction, wave force, rock strength and bioerosion-bioconstruction. From the biological point of view, rocks on the notches and caves serve as substrate for various organisms. Especially notches are the places where covering organisms live

  6. The Sensitivity of Coastal Cliffs to Changes in Sea Level

    Science.gov (United States)

    Rosser, N.; Lim, M.; Petley, D.

    2007-12-01

    The impact of waves upon coastal cliffs is a significant control on erosion and subsequent cliff retreat. It is widely anticipated that climatically-driven sea-level rise will result in an increase in the rate of erosion, and thus the retreat, of coastal cliffs. Quantifying the changes in the rate of coastal erosion remains problematic, primarily due to the difficulty of collecting high-precision and high-frequency monitoring data on both cliff change and the variations in environmental conditions at the coast. In the UK, local authorities now have to produce a "Shoreline Management Plan" (SMP), indicating how the coastline will be managed for the future. This requires the estimation of rates of coastal retreat over the next century, making the impact of sea-level change a critical consideration. This study presents the results from a three year monitoring survey of a section of near-vertical coastal cliffs in north-east England. Data have been collected using a high-resolution terrestrial laser scanner to obtain cliff surfaces. Analysis of successive 3D cliff models is used to derive sequential change, from which the precise nature, geometry and rate of retreat can be measured. In parallel, data has been collected on the micro-seismic impact of waves onto the cliff to gain a direct measure of the delivery of energy at any given sea-level, rather than using a function of wave and tide gauge records. The coastline studied has a significant tidal range, in excess of 6 m, in addition to a large seasonal variability in mean tide heights, allowing a range of sea-level conditions to be assessed. For comparison weather, tide and wave monitoring has been undertaken. The results suggest a close link between the magnitude and frequency of wave impact and the loss of material from the cliff face. Marked changes in wave impact are apparent as the tide level fluctuates on an inter-monthly and inter-annual basis. Thresholds are identified which appear to reflect discrete changes

  7. Multi-temporal Terrestrial Laser Scanner monitoring of coastal instability processes at Coroglio cliff

    Science.gov (United States)

    Caputo, Teresa; Somma, Renato; Marino, Ermanno; Matano, Fabio; Troise, Claudia; De Natale, Giuseppe

    2016-04-01

    small (> 50 cm wide) erosion forms have been recognized. Finally, the upper part of the cliff, characterized by loose pyroclastic deposits covered by vegetation, resulted affected by small collapses, which can involve the public gardens of Virgiliano Park, located at the top of the cliff.

  8. General minisum circle location

    DEFF Research Database (Denmark)

    Körner, Mark; Brimberg, Jack; Juel, Henrik;

    2009-01-01

    In our paper we approximate a set of given points by a general circle. More precisely, we consider the problem of locating and scaling the unit ball of some given norm k1 with respect to xed points on the plane such that the sum of weighted distances between the circle and the xed points is...... minimized, where the distance is measured by a norm k2. We present results for the general case. In the case that k1 and k2 are both block norms, we are able to identify a nite dominating set in R3 for the problem, which can be obtained as the intersection of cones....

  9. Circles and Clifford Algebras

    OpenAIRE

    Timorin, Vladlen

    2002-01-01

    Consider a smooth map from a neighborhood of the origin in a real vector space to a neighborhood of the origin in a Euclidean space. Suppose that this map takes all germs of lines passing through the origin to germs of Euclidean circles, or lines, or a point. We prove that under some simple additional assumptions this map takes all lines passing though the origin to the same circles as a Hopf map coming from a representation of a Clifford algebra does. We also describe a connection between ou...

  10. Literature Circles Go Digital

    Science.gov (United States)

    Bromley, Karen; Faughnan, Michelle; Ham, Susan; Miller, Melissa; Armstrong, Traci; Crandall, Cassandra; Garrison, Julia; Marrone, Nicholas

    2014-01-01

    This article describes a literature circle of seven pre-service teacher education students who read "Al Capone Shines My Shoes" (G. Choldenko, 2009). Students used the Internet to complete their roles, shared what they learned as they discussed the book, and then wrote about the digital experience. Four themes emerged from an analysis of…

  11. QWL Strategies: Quality Circles.

    Science.gov (United States)

    Martell, Charles; Tyson, John

    1983-01-01

    Proposes use of quality circles (QCs)--groups of employees who meet to learn and apply techniques for solving problems affecting work or workplace--to involve library employees in decision-making process and improve morale and product/service quality. Basic philosophy, establishment of QC, and QC techniques are noted. Twelve references are…

  12. Locating Problems with Quality Circles.

    Science.gov (United States)

    White, Donald D.; Bednar, David A.

    1985-01-01

    Five categories of common quality circles problems are identified to help firms anticipate difficulties and avert circle failures. These categories include encountered internal problems, encountered external problems, created internal problems, created external problems, and interface problems. Solutions are suggested. (CT)

  13. A game magically circling

    DEFF Research Database (Denmark)

    Ejsing-Duun, Stine

    This chapter analyses the relationship between players, the game world, and the ordinary world in alternative reality games (ARGs) and location-based games (LBGs). These games use technology to create a game world in the everyday scene. The topic of this chapter is the concept of the 'magic circle......', which defines the relationship between play and the ordinary world, and how this concept relates to a new kind of game....

  14. Sea-cliff erosion as a function of beach changes and extreme wave runup during the 1997-1998 El Nino

    Science.gov (United States)

    Sallenger, A.H., Jr.; Krabill, W.; Brock, J.; Swift, R.; Manizade, S.; Stockdon, H.

    2002-01-01

    Over time scales of hundreds to thousands of years, the net longshore sand transport direction along the central California coast has been driven to the south by North Pacific winter swell. In contrast, during the El Nin??o winter of 1997-1998, comparisons of before and after airborne lidar surveys showed sand was transported from south to north and accumulated on the south sides of resistant headlands bordering pocket beaches. This resulted in significant beach erosion at the south ends of pocket beaches and deposition in the north ends. Coincident with the south-to-north redistribution of sand, shoreline morphology became prominently cuspate with longshore wavelengths of 400-700 m. The width and elevation of beaches were least where maximum shoreline erosion occurred, preferentially exposing cliffs to wave attack. The resulting erosional hotspots typically were located in the embayments of giant cusps in the southern end of the pocket beaches. The observed magnitude of sea cliff retreat, which reached 14 m, varied with the number of hours that extreme wave runup exceeded certain thresholds representing the protective capacity of the beach during the El Nin??o winter. A threshold representing the width of the beach performed better than a threshold representing the elevation of the beach. The magnitude of cliff erosion can be scaled using a simple model based on the cross-shore distance that extreme wave runup exceeded the pre-winter cliff position. Cliff erosion appears to be a balance between terrestrial mass wasting processes, which tend to decrease the cliff slope, and wave attack, which removes debris and erodes the cliff base increasing the cliff slope. ?? 2002 Elsevier Science B.V. All rights reserved.

  15. The Dictator's Inner Circle

    OpenAIRE

    Patrick Francois; Ilia Rainer; Francesco Trebbi

    2014-01-01

    We posit the problem of an autocrat who has to allocate access to the executive positions in his inner circle and define the career profile of his own insiders. Statically, granting access to an executive post to a more experienced subordinate increases political returns to the post, but is more threatening to the leader in case of a coup. Dynamically, the leader monitors the capacity of staging a coup by his subordinates, which grows over time, and the incentives of trading a subordinate's o...

  16. Cliff swallow populations in the southern Askinuk Mountains, Alaska

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — During breeding season, cliff swallows are widely distributed throughout Alaska and North America south to Mexico, and they are locally common in western and...

  17. Life strategies of bryophytes on loess cliffs in Vojvodina, Serbia

    Directory of Open Access Journals (Sweden)

    Sabovljević Marko S.

    2004-01-01

    Full Text Available The loess cliffs of Vojvodina present a special ecosystem type. The main plant components in these habitats are cryptogams (bryophytes and lichens. The biology and life strategies of bryophytes recorded on loess in Vojvodina are studied in the present work, whose results confirm a very special ecology in such habitats. Colonist species with xeropottioid characteristics are dominant among bryophytes. It is stressed that loess cliff habitats are especially important from the standpoint of conservation.

  18. Uranophane at the Silver Cliff Mine Near Lusk, Niobrara County, Wyoming

    Energy Technology Data Exchange (ETDEWEB)

    Wilmarth, V.R.; Johnson, D.H.

    1952-05-01

    In 1950, the U.S. Geological Survey studied a uranium deposit, previously exploited, at the Silver Cliff mine near Lusk, Wyoming. The deposit consists primarily of uranophane that occurs as fracture fillings and small replacement pockets in faulted and fractured quartzite of Cambrian (?) age. The country rock in the vicinity of the mine is schist of pre-Cambrian age intruded by pegmatite dikes and unconformably overlain by flat-lying Cambrian (?) quartzite. The mine is at the southern end of the Lusk Dome, a local structure probably related to the Hartville uplift. In the immediate vicinity of the mine, this dome is cut by the Silver Cliff fault, which is a north-trneding high-angle reverse fault approximately 1,200 feet in length with a stratigraphic throw of 70 feet. The fractured quartzite has been the locus for the deposition of uranophane, metatorbernite, pitchblende, calcite, native silver, native copper, chalcocite, azurite, malachite, chrysocolla, and cuprite. The fault was probably mineralized throughout its length, but owing to erosion the mineralized zone is now discontinuous. The principal ore body is about 800 feet long. The width and depth of the mineralized zone are not accurately known but are at least 20 feet and 60 feet, respectively. The uranium content of material sampled in the mine ranges from 0.001 to 0.23 percent uranium, whereas dump samples range from 0.076 to 3.39 percent uranium.

  19. Stability of permafrost dominated coastal cliffs in the Arctic

    Science.gov (United States)

    Hoque, Md. Azharul; Pollard, Wayne H.

    2016-03-01

    Block failure is considered to be an important component of coastal retreat in permafrost regions. A comprehensive model is developed to study the effects of thermoerosional niche and ice wedge morphology on the stability of permafrost dominated coastal cliff against block failure. The model is formulated by coupling slope stability analysis with a time dependent progression of thermoerosional niches and the morphology of the nearby ice wedges. Model computations are initially performed for failure conditions for a given cliff height, frozen soil strength, ice content, water pressure in the active layer, thermoerosional niche depth and ice wedge morphology. Under these conditions block failures are found to be predominantly overturning failures and are governed by the tensile strength of frozen soil, thermoerosional niche depth and ice wedge location and depth. The effects of ice wedges are then examined by analyzing failure conditions for ice wedges of different locations and depths. For a given cliff height, strength and thermoerosional niche, block failure may occur at a range of different combinations of ice wedge locations and depths. Two stability nomograms are developed through repeated model calculations for range of cliff heights and frozen soil tensile strength. These nomograms can be used to determine the critical combinations of thermoerosional niche depth, ice wedge distance and ice wedge depth that lead to block collapse of a cliff of known height and soil strength. Some analytical expressions are also derived to determine potential block failure criteria along Arctic coasts.

  20. Deformable templates for circle recognition

    International Nuclear Information System (INIS)

    An algorithm for the circle recognition, using deformable templates, was carried out and its performance was studied. The displacement of the points from circles and the presence of noise that appear in real situations were taken into account. The deformable templates algorithm is initialized by Hough transform, which performs a rough evaluation of parameters. However due to inefficiency of the standard Hough transform, a new fast Hough transform procedure was proposed with an automatic choice of the appropriate cut on histograms and handling of splitting peaks. Having the approximate number of arms and the corresponding initial values of the parameters from the Hough transform as input, a neural network finds circles with high resolution. To avoid getting stuck into local minima we decrease the interaction between the arms and use the simulated annealing procedure where the system is allowed to thermalize for a sequence of temperature according to the Boltzmann distribution. Besides we penalize the case in which an elastic circle stopped its evolution having not enough points on it. Simulated data were used to study the efficiency of the algorithm depending on such factors as the noise level, displacements of the points from circles, the number of points per circle and the distance between the centre of two overlapped circles. Results show the satisfactory robustness of our algorithm to background contaminations. Then this technique was successfully applied to real data obtained in Au-Pb interactions from the RICH detectors used in CERES/NA45 experiment

  1. Power laws statistics of cliff failures, scaling and percolation

    CERN Document Server

    Baldassarri, Andrea

    2014-01-01

    The size of large cliff failures may be described in several ways, for instance considering the horizontal eroded area at the cliff top and the maximum local retreat of the coastline. Field studies suggest that, for large failures, the frequencies of these two quantities decrease as power laws of the respective magnitudes, defining two different decay exponents. Moreover, the horizontal area increases as a power law of the maximum local retreat, identifying a third exponent. Such observation suggests that the geometry of cliff failures are statistically similar for different magnitudes. Power laws are familiar in the physics of critical systems. The corresponding exponents satisfy precise relations and are proven to be universal features, common to very different systems. Following the approach typical of statistical physics, we propose a "scaling hypothesis" resulting in a relation between the three above exponents: there is a precise, mathematical relation between the distributions of magnitudes of erosion ...

  2. Cliff House Hotel: Dessert Menu 5th of September, 2014.

    OpenAIRE

    Cliff House Hotel

    2014-01-01

    The Cliff House Hotel is a five-star, privately owned luxury hotel located close to Cork and Waterford. The building seems to cling to a cliff on the south side of Ardmore Bay where there has long been a fishing village, and a Christian settlement that pre-dates St. Patrick. From sun-drenched terraces and private balconies it is possible to see Ardmore’s sands, lobster pots and dolphins that play out on the water. All our luxury rooms and suites are sea facing while many are interconnected...

  3. Cliff House Hotel: Dinner Menu 5th of September, 2014.

    OpenAIRE

    Cliff House Hotel

    2014-01-01

    The Cliff House Hotel is a five-star, privately owned luxury hotel located close to Cork and Waterford. The building seems to cling to a cliff on the south side of Ardmore Bay where there has long been a fishing village, and a Christian settlement that pre-dates St. Patrick. From sun-drenched terraces and private balconies it is possible to see Ardmore’s sands, lobster pots and dolphins that play out on the water. All our luxury rooms and suites are sea facing while many are interconnected...

  4. Cliff House Hotel: Tasting Menu 4th of September, 2014.

    OpenAIRE

    Cliff House Hotel

    2014-01-01

    The Cliff House Hotel is a five-star, privately owned luxury hotel located close to Cork and Waterford. The building seems to cling to a cliff on the south side of Ardmore Bay where there has long been a fishing village, and a Christian settlement that pre-dates St. Patrick. From sun-drenched terraces and private balconies it is possible to see Ardmore’s sands, lobster pots and dolphins that play out on the water. All our luxury rooms and suites are sea facing while many are interconnected...

  5. CliffsNotes Writing Grammar, Usage, and Style Quick Review

    CERN Document Server

    Eggenschwiler, Jean; Reinhardt, Claudia L W

    2011-01-01

    Inside the Book: Nouns - Verbs - Pronouns - Modifiers - Connecting Words and Phrases - Clauses, Phrases, and Sentences - Common Sentence Errors - Periods, Question Marks, and Exclamation Marks - Commas, Semicolons, and Colons - Dashes, Parentheses, and Quotation Marks - Idioms, Clichés, Jargon, and Wordiness - How to Begin a Writing Assignment - How to Research and Organize Your Writing - Revising and Editing - Review Questions - Resource Center - Glossary - Frequently Confused Words Why CliffsNotes? Go with the name you know and trust - Get the information you need-fast! CliffsNotes Quick Rev

  6. Persistence for Circle Valued Maps

    OpenAIRE

    Burghelea, Dan; Dey, Tamal K.

    2011-01-01

    We study circle valued maps and consider the persistence of the homology of their fibers. The outcome is a finite collection of computable invariants which answer the basic questions on persistence and in addition encode the topology of the source space and its relevant subspaces. Unlike persistence of real valued maps, circle valued maps enjoy a different class of invariants called Jordan cells in addition to bar codes. We establish a relation between the homology of the source space and of ...

  7. Mapping of landslide susceptibility of coastal cliffs : the Mont-Roig del Camp case study

    OpenAIRE

    Montoya-Montei, I.; Rodríguez-Santalla, I.; Sánchez-García, M.J.; Alcántara-Carrió, Javier; Martín-Velázquez, S.; Gómez-Ortiz, D.; Martín-Crespo, T.

    2012-01-01

    The weathered and fractured conglomerate cliffs of Mont Roig del Camp constitute a rock fall hazard for the surrounding pocket beaches and, therefore, for the population that frequent them, especially over the summer. Landslide susceptibility of the cliff has been assessed using the Rock Engineering System method (RES). The determinant and triggering factors considered in this study include: wave exposure, shoreline variations, cliff height, cliff slope, geotechnical quality of the rocky mass...

  8. Transportation Distances on the Circle

    CERN Document Server

    Rabin, Julien; Gousseau, Yann

    2009-01-01

    In this contribution, we study Monge-Kantorovich distances between discrete set of points on the unit circle, when the ground distance between two points x and y on the circle is defined as the L1-shortest path. We first prove that computing a Monge-Kantorovich distance between two given sets of pairwise different points boils down to cut the circle at a well chosen point and to compute the same distance on the real line. This result is then used to prove a formula on the Earth Mover's Distance which is a particular Monge-Kantorovich distance. This formula asserts that the Earth Mover's Distance between two discrete circular normalized histograms can be computed from their cumulative histograms. This formula is used in recent papers on the matching of local features between images, where the Earth Mover's Distance is used to compare circular histograms of gradient orientations.

  9. Closing the circle

    International Nuclear Information System (INIS)

    The used uranium oxide fuel discharged from CANDU nuclear power reactors has physical and chemical properties similar to those of natural uranium oxide found in uranium ore bodies in the earth's crust. When discharged from the reactor, less than 1% of the initial uranium atoms have been transmuted to new radioactive atoms. The long-term hazard is associated with four exceptionally long-lived radionuclides: iodine-129, cesium-135, technetium-99 and plutonium-239. These long-lived radionuclides can do harm only if they are ingested. The only practical way for this to occur is for the uranium oxide grains to be dissolved in groundwater. Since 1978, AECL has been developing the technology to dispose of used fuel in a vault excavated, 500 m to 1,000 m beneath the surface, in plutonic rock of the Precambrian Canadian Shield. Used-fuel bundles would be sealed in corrosion-resistant containers which would be placed in clay-lined holes bored in the floor of the vault. When filled with used-fuel containers, the vault would be backfilled and sealed with a mixture of clay and crushed rock. Compelling evidence for the safety of the disposal concept is provided from recent studies of uranium ore bodies in the earth's crust, most notably at Cigar Lake. The uranium-ore body at Cigar Lake was formed about 1.3 billion years ago and, in spite of continuous contact with groundwater over this period, there has been no significant movement of uranium. Our understanding of the hydrogeology and geochemistry associated with the deposit gives us confidence that used fuel can be put back into the geological environment and isolated for its hazardous lifetime

  10. On a Family of Circles

    Science.gov (United States)

    Feeman, Timothy G.

    2011-01-01

    We generalize a standard example from precalculus and calculus texts to give a simple description in polar coordinates of any circle that passes through the origin. We discuss an occurrence of this formula in the context of medical imaging. (Contains 1 figure.)

  11. Apollonian circles and hyperbolic geometry

    CERN Document Server

    Klén, Riku

    2010-01-01

    The goal of this paper is to study two basic problems of hyperbolic geometry. The first problem is to compare the hyperbolic and Euclidean distances. The second problem is to find hyperbolic counterparts of some basic geometric constructions such as the construction of the middle point of a hyperbolic geodesic segment. Apollonian circles have a key role in this study.

  12. Digital Storytelling: Reinventing Literature Circles

    Science.gov (United States)

    Tobin, Maryann Tatum

    2012-01-01

    New literacies in reading research demand the study of comprehension skills using multiple modalities through a more complex, multi-platform view of reading. Taking into account the robust roll of technology in our daily lives, this article presents an update to the traditional literature circle lesson to include digital storytelling and…

  13. The modes of instability of the Antalya (SW-Turkey) coastal cliffs

    Science.gov (United States)

    Dipova, Nihat

    2010-05-01

    Cliff erosion and the consequent instabilities present a significant risk to Antalya city (SW-Turkey). Erosional processes include the chemical action of mixing zone water, the mechanical action of waves, salt erosion and biological degradation. The rock properties (lithology, stratification, strength etc) are the controlling factors to this erosion. The coastal cliffs of Antalya are composed of tufa type carbonate rocks which occur in a wide range, from collapsible soil to hard rock. The instability problems of the cliffs of Antalya tufa commonly involve: rock fall, cave collapse, raveling, washout of weakly lithified tufa, shear failure and secondary toppling. Secondary toppling type instabilities, Culmann type failures and complex failures, a combination of these two, are widespread on the cliffs. The occurrence of large failures are usually associated with heavy rainfall as heavy rainfall causes the saturation of pores, increases pore water pressures and reduces the strength of the rock. Comparison between aerial photographs and topographic maps of different dates, do not provide evidence of considerable retreat. According to the historical data there has been little or no cliff retreat for 2000 years. Therefore the erosion rate of the Antalya tufa cliffs is said to be so very slow that retreat is valid only in a geological timescale. However in an engineering timescale these cliffs are subjected to instabilities and to local failures causing local retreats. Keywords: Antalya, Coastal cliff, Cliff erosion, Cliff instability, Tufa

  14. Aerial Photogrammetric Analysis of a Scree Slope and Cliff

    Science.gov (United States)

    Saunders, Greg; Galland, Olivier; Mair, Karen

    2014-05-01

    Mapping the physical features of landslide tracks provides information about factors controlling landslide movement. The increasing availability of unmanned aerial vehicles (UAV) provides the opportunity to efficiently and cost effectively map terrain. The main goal of this field study is to create a streamlined work-flow from acquisition to interpretation for the photogrammetric analysis of landslide tracks. Here an open source software package MicMac is used for ortho-image and point-cloud creation. A series of two flights were conducted over a scree (rockfall) slope in Kolsas, Norway. The slope runs roughly 500 m north-south with a maximum width of 60 m. A cliff to the west is the source area for the scree. The cliff consists of conglomerate, basalt, and porphyry from bottom to top respectively. The grain size of boulders in the scree slope apparently varies due to lateral differences in the cliff composition. The flights were completed under cloud cover and consisted of multiple lengthwise passes over the scree field. There was a minimum of 75% overlap between images. During the first flight the altitude was roughly 100 m, the camera was positioned normal to the scree (60 degrees from horizontal), and the resolution was 2.7 cm per pixel. The second flight had an altitude of 200 m, the camera orientation was 30 degrees from horizontal, and the resolution was 4.0 cm per pixel. Using the Micmac engine, Ortho-photos and Digital Elevation Models (DEM) were created for both the scree and the cliff. This data will allow for analysis of grain-size, surface roughness, grain-shape, fracture plane orientation, as well as geological mapping. Further work will focus the quantitative assessment of the significance different camera altitudes and angles have on the results. The work-flow used in this study provides a repeatable method for aerial photogrammetric surveys of scree slopes.

  15. Ancient "Red Cliff" battlefield: a historical-geographic study

    Institute of Scientific and Technical Information of China (English)

    Zhang Xiugui

    2006-01-01

    The famous battle of Chibi,or "battle of Red Cliff",took place in 208 CE,the 13th year of the Jian'an period of the Eastern Han dynasty.This paper holds that the whole battle consisted of three inseparable stages,namely the initial clash at Chibi,the chase battle to Wulin,and Cao Cao's disorganized escape along Huarong Road.The Red Cliff battlefield thus extended across a distance of more than 300 li (150km).Even if the Chibi where the initial military engagement took place (that is,Chiji Hill,southwest of Wuchang in modern Wuhan City) has already disappeared,it should be restored to its proper historical position.The chase battle along the Yangzi River came to an end at Wulin,across the river is Chibi Hill in today's Chibi City.Although this Chibi is not the Chibi where the initial combat took place,it nonetheless forms an integral part of the ancient Chibi battlefield as a whole.The Huarong Road along which Cao Cao escaped runs through the middle of today's Jianghan Plain.Finally,the text aims to show that Chibi (Red Nose)1 Hill in modern Huangzhou City has nothing to do with the Chibi of the "battle of Red Cliff."

  16. Three-manifolds, Foliations and Circles, I

    OpenAIRE

    Thurston, William P.

    1997-01-01

    This paper investigates certain foliations of three-manifolds that are hybrids of fibrations over the circle with foliated circle bundles over surfaces: a 3-manifold slithers around the circle when its universal cover fibers over the circle so that deck transformations are bundle automorphisms. Examples include hyperbolic 3-manifolds of every possible homological type. We show that all such foliations admit transverse pseudo-Anosov flows, and that in the universal cover of the hyperbolic case...

  17. Locating a minisum circle in the plane

    DEFF Research Database (Denmark)

    Brimberg, Jack; Juel, Henrik; Schöbel, Anita

    2009-01-01

    We consider the problem of locating a circle with respect to existing facilities in the plane such that the sum of weighted distances between the circle and the facilities is minimized, i.e., we approximate a set of given points by a circle regarding the sum of weighted distances. If the radius of...

  18. Creating collaborative advantage through students' quality circles

    OpenAIRE

    Ennals, Richard; KOKSAL, Hayal

    2011-01-01

    Turkey has played a pioneering role in the Quality movement in both industry and education, providing sound foundations for current development processes. Students’ Quality Circles, or Imece Circles, have provided a focus in Turkey and internationally. In the context of Knowledge Society and Knowledge Economy, new forms of work organisation offer collaborative advantage. Keywords: collaboration, empowerment, Imece, Quality, social capital, Students’ Quality Circles

  19. Learning circles: a strategy for clinical practicum.

    Science.gov (United States)

    Hiebert, J L

    1996-01-01

    The author describes the use of learning circles as a strategy to increase critical-thinking skills. The author describes the origins of the learning circle strategy in experiential and cooperative learning theory, the development of a pilot project using learning circles to explore ethical issues in a clinical course, and student and instructor perceptions of the effectiveness of this strategy. PMID:8788825

  20. Sun Circle: An Archeoastronomical Monument

    Science.gov (United States)

    Tanz, C.

    2013-04-01

    The Sun Circle is a ceremonial structure in a public park in Tucson, Arizona, designed to track the Sun's movement through the sky over the course of the year. It is also a place where people who use the park—walkers, joggers, bikers, skaters—can pause and sit down and enjoy a little rest. Although it is a modern construction, it draws its inspiration from ancient archeoastronomical structures of the American southwest.

  1. Creating Circle of Courage Schools

    Science.gov (United States)

    Van Bockern, Steve; McDonald, Tim

    2012-01-01

    Dream what a school would be like in which the purpose is to meet the needs of children and the larger community so that all can lead a good life. Using the Circle of Courage[TM]--a model grounded in values of deep respect for the dignity of all--the authors of this article outline overarching goals and indicators that can turn this dream into…

  2. A pliocene cliff-line around the Giza Pyramids Plateau, Egypt

    OpenAIRE

    Aigner, Thomas

    1982-01-01

    Aigner, T., 1983. A Pliocene cliff-line around the Giza Pyramids Plateau, Egypt. Palaeogeogr., Palaeoclimatol., Palaeoecol., 4 2 : 313—322. Escarpments bordering the Giza Pyramids Plateau represent the cliff-line of a Pliocene transgression up the pre-Nile ("Eonile") Valley. Geomorphologically, a limestone cliff can be distinguished from a slip-block shore associated with a distinct fining-up sequence. Differences in bedrock lithology and in structure (Joint pattern, faults) are morphogen...

  3. Extraction of Circle from Digital Images

    Directory of Open Access Journals (Sweden)

    Nitasha Singla

    2012-08-01

    Full Text Available As we know, we wouldn’t be able to drive our cars. Because wheels are circles, so are steering wheels. When we play sports we use balls- which are spheres, or three dimensional representations of circles. So circle plays very important role in our life. In this paper, we detect circle using two algorithms. First one is Canny Edge Detection Algorithm with the help of this algorithm we find out edge detected digital image. Second is Freeman Chain Code Algorithm for contour tracing or find out the arcs which are part of circle or not. All this is done in MATLAB R2010a.

  4. Test method improves motor bearing wear assessment at Calvert Cliffs

    International Nuclear Information System (INIS)

    This article describes how motor current signature analysis is helping plant maintenance engineers assess the condition of inaccessible motors during plant operation. At Baltimore Gas ampersand Electric Co.'s Calvert Cliffs Nuclear Power Plant, maintenance activities are based on reliability-centered maintenance (RCM) concepts and guided by a non-intrusive condition evaluation (NICE) policy wherever achievable. One technique that fits these criteria is motor current signature analysis (MCSA). The new technique has helped plant maintenance personnel assess the condition of relatively inaccessible containment cooling fan motors inside reactor containment during normal plant operation

  5. Nature of short-period microtremors on the cliff-like ground. 3; Gakechi kinbo no tanshuki bido . 3

    Energy Technology Data Exchange (ETDEWEB)

    Maiguma, T.; Matsuzawa, H. [Saitama University, Saitama (Japan). Faculty of Engineering

    1996-05-01

    Vibration characteristics were investigated of the ground in the vicinity of a cliff-like sharp slope. Short-period microtremors were observed in the vicinity of an artificially made cliff-like test ground, height 8m and inclination 90{degree}, and a natural cliff, height approximately 9m and inclination approximately 35{degree}. The artificial cliff was reinforced by a virtually vertical retaining wall of concrete, and the ground was prepared for testing with a belt approximately 20m wide and 50m long along the cliff face. All the vibration components were simultaneously measured at measuring spots that were located 5-40m apart from the cliff end and orientated perpendicular to the cliff face. It was then found that in case of artificial cliff there is a conspicuous 3.1Hz prevalent ground vibration in the component squarely meeting the cliff face, that the prevalent ground vibration is not particularly great near the cliff end because the retaining wall and the ground are artificially prepared, that there is no influence of the cliff-like ground in the ground vibration parallel to or vertical along the cliff face, and that in case of natural ground there are no vibration characteristic proper to a cliff-like ground in any of the vibration components. 3 refs., 7 figs.

  6. Information flow through the disaster circle

    DEFF Research Database (Denmark)

    Egedorf, Maren Marie; Villanueva Holm-Nielsen, Pablo

    2015-01-01

    The traditional view of the disaster circle is phase based. Disaster and development professionals recognize that the actions carried out in the various phases of the disaster management cycle are overlapping and build upon each other, having resilience as the overall goal. However information does...... of the disaster management circle and organizations involved. This could be achieved through a platform that gathers and shares information from assessments and evaluations from previous phases of the disaster management circle. A donor requirement for organizations to document how effectively they...... not necessarily flow across the phases of the circle in an effective manner. This is particularly true for the information that crosses the disaster point of the circle. Organisations carry out assessments, surveys and baselines for various purposes, at various points of time in the disaster circle...

  7. Interactions and management of the Stakeholders-Tourists-Trails-Environment system at Látrabjarg Cliffs (Iceland): a comparative study with Moher Cliffs (Ireland)

    OpenAIRE

    Legatelois, Marie Jannie Madeleine, 1989-

    2014-01-01

    Látrabjarg Cliffs (Iceland) are the biggest cliffs and sea bird colony of Europe. This site attracts an increasing number of international tourists. However, the current infrastructure presents on the site is not adapted for this tourism and the resulting pressure on the environment raises issues for the sustainability of this important site. Stakeholders are currently transforming Látrabjarg into a National Park and developing conservation and land-use plans to address these issues. The rese...

  8. "Take Me to the Mathematical Circle!"

    OpenAIRE

    Veilande, Ingrida

    2012-01-01

    Preparing the students for various mathematical contests are the key goals of mathematical circles in Latvian schools. The reason why mathematical circles for students of primary schools are organised rather seldom is that problem sets of Olympiads are mainly created for students of 5th to 12th grades. The young participants of circles have to be introduced with the basic principles of Olimpiads mathematics too.

  9. Three techniques for obtaining algebraic circle packings

    OpenAIRE

    Louder, Larsen; Mishchenko, Andrey M.; Souto, Juan

    2014-01-01

    The main purpose of this article is to demonstrate three techniques for proving algebraicity statements about circle packings. We give proofs of three related theorems: (1) that every finite simple planar graph is the contact graph of a circle packing on the Riemann sphere, equivalently in the complex plane, all of whose tangency points, centers, and radii are algebraic, (2) that every flat conformal torus which admits a circle packing whose contact graph triangulates the torus has algebraic ...

  10. 77 FR 10784 - Calvert Cliffs Nuclear Power Plant, LLC; Notice of Withdrawal of Application for Amendment to...

    Science.gov (United States)

    2012-02-23

    ... COMMISSION Calvert Cliffs Nuclear Power Plant, LLC; Notice of Withdrawal of Application for Amendment to... of Calvert Cliffs Nuclear Power Plant, LLC, the licensee, to withdraw its application dated October... the Calvert Cliffs Nuclear Plant, Units 1 and 2, respectively, located in Calvert County,...

  11. Circle discrepancy for checkerboard measures

    CERN Document Server

    Kolountzakis, Mihail N

    2012-01-01

    Consider the plane as a union of congruent unit squares in a checkerboard pattern, each square colored black or white in an arbitrary manner. The discrepancy of a curve with respect to a given coloring is the difference of its white length minus its black length, in absolute value. We show that for every radius t>1 there exists a full circle of radius either t or 2t with discrepancy greater than ct^(1/2) for some numerical constant c>0. We also show that for every t>1 there exists a circular arc of radius exactly t with discrepancy greater than ct^(1/2). Finally we investigate the corresponding problem for more general curves and their interiors. These results answer questions posed by Kolountzakis and Iosevich.

  12. Developing Soft Skills Using "Literature Circles"

    Science.gov (United States)

    Azmi, Mohd Nazri Bin Latiff

    2013-01-01

    This study investigates the impact of the implementation of "Literature Circles" in an Active Learning classroom in relations to developing soft skills among university students. The use of Literature Circles is a well-known strategy in teaching the students to be more creative, independent, and think out of the box. A group of…

  13. Circle-preserving transformations in Finsler spaces

    OpenAIRE

    Bidabad, Behroz; Shen, Zhongmin

    2011-01-01

    Here, by extending the definition of circle to Finsler geometry, we show that, every circle-preserving local diffeomorphism is conformal. This result implies that in Finsler geometry, the definition of concircular change of metrics, a priori, does not require the conformal assumption.

  14. Locating a circle on a sphere

    DEFF Research Database (Denmark)

    Brimberg, Jack; Juel, Henrik; Schöbel, Anita

    2007-01-01

    We consider the problem of locating a spherical circle with respect to existing facilities on a sphere, such that the sum of distances between the circle and the facilities is minimized or such that the maximum distance is minimized. The problem properties are analyzed, and we give solution...... contexts such as search-and-rescue missions and medical or biological studies....

  15. Unit Circles and Inverse Trigonometric Functions

    Science.gov (United States)

    Barrera, Azael

    2014-01-01

    Historical accounts of trigonometry refer to the works of many Indian and Arab astronomers on the origin of the trigonometric functions as we know them now, in particular Abu al-Wafa (ca. 980 CE), who determined and named all known trigonometric functions from segments constructed on a regular circle and later on a unit circle (Moussa 2011;…

  16. A note on circle patterns on surfaces

    OpenAIRE

    Guo, Ren

    2007-01-01

    In this paper we give two different proofs of Bobenko and Springborn's theorem of circle pattern: there exists a hyperbolic (or Euclidean) circle pattern with proscribed intersection angles and cone angles on a cellular decomposed surface up to isometry (or similarity).

  17. The Circle of Courage and Positive Psychology

    Science.gov (United States)

    Brendtro, Larry K.; Brokenleg, Martin; Van Bockern, Steve

    2005-01-01

    The Circle of Courage identifies four universal needs of all children: Belonging, Mastery, Independence, and Generosity. When these needs are met, children grow and thrive. But when these growth needs are frustrated, multiple problems follow. The Circle of Courage defines problems of youth in terms of strengths and developmental needs. These…

  18. Management perspective of the Alloy 600 issue at Calvert Cliffs

    International Nuclear Information System (INIS)

    In response to the question posed in the agenda regarding this presentation, let it be known at the onset that the impact of the pressurizer nozzle primary water stress corrosion cracking (PWSCC) on Calvert Cliffs was gigantic. It reached all levels of the Company management, including the Board of Directors. The investigation and repair cost over $20 million without any consideration for replacement power or consequential lost work by those who were involved in the repairs to the pressurizer. It occupied the attention of management and was a major ingredient to most decision processes for about eight months. It caused organizational modifications, capital commitments, and major resource reallocation. It became the focal point around which much of the site work revolved for approximately 6 months (until the repair process was well in hand and other issues prevailed). I will try and describe the impact it had on management, the ingredients used to reach certain important decisions and the concerns that influenced the decisions

  19. Survey on Cosmogenic 26Al in Lewis Cliff Meteorites

    Science.gov (United States)

    Welten, K. C.; Alderliesten, C.; Lindner, L.

    1992-07-01

    INTRODUCTION: We have embarked upon a ^26Al gamma-ray survey of meteorites selected from about 2000 samples recently recovered from the Lewis Cliff Ice Fields (84 degrees 18'S/161 degrees 20'E). Due to its 705-ka half-life ^26Al can be used for estimating terrestrial ages and thus contribute to further characterization of Antarctic meteorites in addition to their classification and thermoluminescence (TL) properties. The ^26Al survey is also useful for identifying meteorites with unusual exposure histories, which merit additional measurements of cosmogenic radionuclides (by AMS) and noble gases. In addition, it provides clues on possible pairings. METHOD: Low-level gamma-ray spectroscopy is well suited for ^26Al survey work, since bulk meteorite samples can be measured routinely and nondestructively without any previous sample preparation. The required size of the samples (30-500 g) makes the method relatively independent of depth effects and compositional inhomogeneities. The use of a high-resolution GeLi detector also allows the determination of the natural ^40K activity and thus the K content of the samples, which can be used as an additional pairing criterion for ordinary chondrites. Also ^137Cs, a fall-out surface contamination [1], is simultaneously measured; low values may be characteristic for meteorites recently fallen or released from the ablating ice. For the detector an efficiency calibration curve has been made that adequately accounts for differences in size and shape of the meteorite samples. RESULTS and DISCUSSION: TERRESTRIAL AGES: So far, we have measured over 30 Lewis Cliff equilibrated H and L chondrites, collected from widely differing locations. Normalized to L-chondrite composition, the ^26Al contents range from 27 to 110 dpm/kg with peaks around 43 and 53 dpm/kg. This bimodal ^26Al distribution is reminiscent of that observed for Allan Hills ordinary chondrites [2]. Tentative terrestrial ages, calculated on the basis of ^26Al saturation

  20. Shakespeare Cliff, rempart symbolique aux portes du royaume

    Directory of Open Access Journals (Sweden)

    Jeremy Price

    2006-02-01

    Full Text Available Figure 1 : Clarkson STANFIELD, Shakespeare Cliff, Dover, 1849, 1862« Il est une falaise, dont le front haut et courbeRegarde avec effroi dans l’abîme qu’elle enserre :Conduis-moi jusqu’à son bordEt je remédierai à la misère que tu souffresPar quelque riche objet ; de cet endroitJe n’aurai point besoin de guide. »Les lignes ci-dessus, tirées de l’Acte IV, Scène I du Roi Lear, font allusion aux falaises de Douvres, plus particulièrement à leur point culminant, un grand bloc de calcaire et de cr...

  1. Survey on Cosmogenic 26Al in Lewis Cliff Meteorites

    Science.gov (United States)

    Welten, K. C.; Alderliesten, C.; Lindner, L.

    1992-07-01

    INTRODUCTION: We have embarked upon a ^26Al gamma-ray survey of meteorites selected from about 2000 samples recently recovered from the Lewis Cliff Ice Fields (84 degrees 18'S/161 degrees 20'E). Due to its 705-ka half-life ^26Al can be used for estimating terrestrial ages and thus contribute to further characterization of Antarctic meteorites in addition to their classification and thermoluminescence (TL) properties. The ^26Al survey is also useful for identifying meteorites with unusual exposure histories, which merit additional measurements of cosmogenic radionuclides (by AMS) and noble gases. In addition, it provides clues on possible pairings. METHOD: Low-level gamma-ray spectroscopy is well suited for ^26Al survey work, since bulk meteorite samples can be measured routinely and nondestructively without any previous sample preparation. The required size of the samples (30-500 g) makes the method relatively independent of depth effects and compositional inhomogeneities. The use of a high-resolution GeLi detector also allows the determination of the natural ^40K activity and thus the K content of the samples, which can be used as an additional pairing criterion for ordinary chondrites. Also ^137Cs, a fall-out surface contamination [1], is simultaneously measured; low values may be characteristic for meteorites recently fallen or released from the ablating ice. For the detector an efficiency calibration curve has been made that adequately accounts for differences in size and shape of the meteorite samples. RESULTS and DISCUSSION: TERRESTRIAL AGES: So far, we have measured over 30 Lewis Cliff equilibrated H and L chondrites, collected from widely differing locations. Normalized to L-chondrite composition, the ^26Al contents range from 27 to 110 dpm/kg with peaks around 43 and 53 dpm/kg. This bimodal ^26Al distribution is reminiscent of that observed for Allan Hills ordinary chondrites [2]. Tentative terrestrial ages, calculated on the basis of ^26Al saturation

  2. Seismic response analysis of a tuff cliff by an effective stress non-linear 2D model approach: an example in Sorrento Peninsula, Italy

    Science.gov (United States)

    di Fiore, V.; Angelino, A.; Buonocunto, F. P.; Rapolla, A.; Tarallo, D.

    2009-04-01

    We present a model to describe the behavior of a tuff cliff under the dynamic stress considering a law reference input motion. The studied area is located in the Sorrento Peninsula, a major Quaternary morpho-structural unit of the western flank of Southern Apennines. The peninsula forms a narrow and elevated mountain range (up to 1444 m) that separates two major embayments of the eastern Tyrrhenian margin and is characterized by a carbonate bedrock capped by pyroclastic deposits (i.e. "Campania Ignimbrite"), originated from the Campi Flegrei volcanic district. The occurrence of steep slopes and the high relief energy of the area, along with the marine erosion at the base of the coastal cliff creates favorable conditions for the occurrence of a generalized instability of the slopes that is manifested by tuff rock falls as prevailing landslide phenomena. These events are highly dangerous because of the sudden detachments of conspicuous volumes of rocks with high speed, especially when the rock fall initiates in the upper part of the slopes. Prediction of such landslides is difficult if not accompanied by accurate hydrogeologic and geotechnical monitoring and assessment. The geometry of our model is represented by a tuff cliff of 48 m height, covered by a 8 m thick volcaniclastic layer. At the base of the tuff cliff marine sand deposits occur. The geotechnical parameters used for the analysis were selected from the literature. We have used an effective stress non-linear 2D model to determine the dynamic stress field of our model. The effective stress non-linear algorithm uses the Direct Integration Method to compute the motion and excess pore-water pressures arising from inertial forces at user-defined time steps. The seismic response analysis was performed using the field shear stress generated by synthetic 1-30 Hz band-limited accelerogram. The finite elements mesh considered for the test problem was established by 395 element and 401 nodal point. Our results show a

  3. Coastal archaeological heritage in relation to geomorphology of cliffs, west coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    Mascarenhas, A.

    at Dona Paula. Goa: larae cracks make such ~reci~nces vulnerable to coilapse (Photo: H. ~a~i); ' Plate 48. The cliff at Varkala, Kerala, is in the process of continuous erosion as the base is composed of soft clay (Photo: A. Mascarenhas) ~late'49.... Forts atop sea cliffs: (4A) The chapel (in the background) within the fort of Diu on the verge of collapse due to severe erosion of sandstone cliffs (Photo: A. Mascarenhas); Plate 50. The seaside wall of Bekal fort (Kerala) on a granite bedrock...

  4. Circles of quality in radiological safety

    International Nuclear Information System (INIS)

    The concept of Circles of quality arose in Japan like an option to capitalize the enormous potential that the workers had developed as a result of its training in the statistical tools of quality. There are presented a series of steps that could be given with the purpose of implementing a program of ALARA circles. The radiological safety is in it finishes instance responsibility of each hard-working one and there won't be a protection program that can work among apathetic people, it is in this sense where the ALARA circles can provide its maximum contribution creating a conscience of responsibility and participation

  5. Cliff Richard hakkab veini tootma. Marilyn Manson avab isikliku kunstinäituse

    Index Scriptorium Estoniae

    2002-01-01

    Cliff Richardi Portugali viinamarjaistandusest pärinevast veinist "Vida Nova". 20. septembril avab oma albumit "The Golden Age Of Grotesque" lõpetav laulja Marilyn Manson oma esimese kunstinäituse Los Angeleses Hollywoodis

  6. Connotations of architectural culture transmitted in cliff carvings in the Bashu region

    Institute of Scientific and Technical Information of China (English)

    LIN Cong-hua; ZHANG Xing-guo; LIU Zhi-yong

    2006-01-01

    Based on site studies,historical literature investigation and academic communication,this work aims to dig out the cultural significance in architectural and religious aspects conveyed in cliff carvings in the Bashu region.After casting a glance at the origin and evolution of Bashu culture and religion mainly involving Daoism and Buddhism recorded in forms of cliff carvings,we concentrated on discovering the national,regional and folk architectural characters implicated in cliff carvings at different sites within the Bashu region.The cliff carvings in this region vividly depicted the evolution of the architectural culture hereof.The essence of their religious and architectural connotations can be good stuff to be input in today's architectural design philosophy.

  7. Virginia Tech's Cliff and Rocky selected for Grand Challenge starting line

    OpenAIRE

    Crumbley, Liz

    2005-01-01

    Virginia Tech's "Cliff" and "Rocky" were among an elite group of 23 autonomous vehicles that revved their engines on Oct. 8 at the starting line of the $2 million DARPA Grand Challenge race through the Mojave Desert.

  8. Development of Waterfall Cliff Face: An Implication from Multitemporal High-definition Topographic Data

    Science.gov (United States)

    Hayakawa, Y. S.; Obanawa, H.

    2015-12-01

    Bedrock knickpoints (waterfalls) often act as erosional front in bedrock rivers, whose geomorphological processes are various. In waterfalls with vertical cliffs, both fluvial erosion and mass movement are feasible to form the landscape. Although morphological changes of such steep cliffs are sometimes visually observed, quantitative and precise measurements of their spatiotemporal distribution have been limited due to poor accessibility to such cliffs. For the clarification of geomorphological processes in such cliffs, multi-temporal mapping of the cliff face at a high resolution can be advantaged by short-range remote sensing approaches. Here we carry out multi-temporal terrestrial laser scanning (TLS), as well as structure-from-motion multi-view stereo (SfM-MVS) photogrammetry based on unmanned aerial system (UAS) for accurate topographic mapping of cliffs around a waterfall. The study site is Kegon Falls in central Japan, having a vertical drop of surface water from top of its overhanging cliff and groundwater outflows from its lower portions. The bedrock consists of alternate layers of jointed andesite lava and conglomerates. The latest major rockfall in 1986 caused approximately 8-m recession of the waterfall lip. Three-dimensional changes of the rock surface were detected by multi-temporal measurements by TLS over years, showing the portions of small rockfalls and surface lowering in the bedrock. Erosion was frequently observed in relatively weak the conglomerates layer, whereas small rockfalls were often found in the andesite layers. Wider areas of the waterfall and cliff were also measured by UAS-based SfM-MVS photogrammetry, improving the mapping quality of the cliff morphology. Point clouds are also projected on a vertical plane to generate a digital elevation model (DEM), and cross-sectional profiles extracted from the DEM indicate the presence of a distinct, 5-10-m deep depression in the cliff face. This appears to have been formed by freeze-thaw and

  9. Sea-cliff erosion at Pacifica, California caused by 1997/98 El Nino storms

    Science.gov (United States)

    Snell, Charles B.; Lajoie, K.R.; Medley, Edward W.

    2000-01-01

    Twelve homes were constructed in 1949 at the top of a sea cliff along Esplanade Drive in the City of Pacifica, located on the northern coast of San Mateo County, California. During the heavy storms of the 1997/98 El Nino winter, a severe episode of cliff retreat undermined seven homes and threatened three others. The geologic, tide, wave, rainfall and wind data were analyzed to determine the causes of this erosion events.

  10. Reconstructing 3D coastal cliffs from airborne oblique photographs without ground control points

    OpenAIRE

    Dewez, T.J. B.

    2014-01-01

    Coastal cliff collapse hazard assessment requires measuring cliff face topography at regular intervals. Terrestrial laser scanner techniques have proven useful so far but are expensive to use either through purchasing the equipment or through survey subcontracting. In addition, terrestrial laser surveys take time which is sometimes incompatible with the time during with the beach is accessible at low-tide. By comparison, structure from motion techniques (SFM) are much less costly to ...

  11. Exotic circles of a remarkable group of piecewise generalized (non linear) circle homeomorphisms

    International Nuclear Information System (INIS)

    Let G be a subgroup of Homeo+(S1). An exotic circle of G is a subgroup of G which is conjugate to SO (2) in Homeo+(S1) but not conjugate to SO (2) in G . The existence of exotic circles shows that the subgroup G is far from being a Lie group. Let r ≥ 1 be an integer, r = +∞ or r ω. In this paper, we prove that the subgroup Pr( S1) of Homeo+(S1) consisting of piecewise class P Cr homeomorphisms of the circle has no exotic circles. However, we show that there exist exotic circles of a particular subgroup (denoted P1r (S1)) of Pr(S1) and we determine the conjugacy classes of all exotic circles in P1r (S1). In particular, for the group PL+(S1) consisting of piecewise linear homeomorphisms we give a simple proof of Minakawa's Theorems. (author)

  12. Darboux cyclides and webs from circles

    KAUST Repository

    Pottmann, Helmut

    2012-01-01

    Motivated by potential applications in architecture, we study Darboux cyclides. These algebraic surfaces of order ≤4 are a superset of Dupin cyclides and quadrics, and they carry up to six real families of circles. Revisiting the classical approach to these surfaces based on the spherical model of 3D Möbius geometry, we provide computational tools for the identification of circle families on a given cyclide and for the direct design of those. In particular, we show that certain triples of circle families may be arranged as so-called hexagonal webs, and we provide a complete classification of all possible hexagonal webs of circles on Darboux cyclides. © 2011 Elsevier B.V. All rights reserved.

  13. Nature of short-period microtremors on the cliff-like ground. Part 4; Gakechi kinbo no tanshuki bido. 4

    Energy Technology Data Exchange (ETDEWEB)

    Maiguma, T.; Yoshiike, T. [Waseda University, Tokyo (Japan). School of Science and Engineering

    1996-10-01

    Microtremors were measured on the cliff-like ground with a height about 10 m, to examine the vibration characteristics. Test field-1 near Akabane, Kita-ku, Tokyo is located in a part of Musashino plateau covered with Kanto loam on its surface, and has relatively sound ground. Test field-2 at Machida is located in the western part of Tama hills, and also has Kanto loam on its surface. For the cliff-like ground with inclined angle 70{degree} at Akabane, remarkably predominant frequency 3.2 Hz was observed for the microtremors in the direction perpendicular to the cliff surface. However, this predominant vibration did not become larger due to the damping effects of the reinforcement walls near the end of cliff and the large trees on the cliff. Influence of the cliff-like ground was scarcely observed in the microtremors spectrum in both the directions parallel and vertical to the cliff-surface. From the observation of microtremors with short period on the cliff-like ground with inclined angle around 32{degree} at Machida, influence of cliff-like ground was not observed in the microtremors spectrum in all of the vibrating directions perpendicular, parallel and vertical to the cliff surface. 3 refs., 10 figs.

  14. Sea cliff instability susceptibility at regional scale: a statistically based assessment in the southern Algarve, Portugal

    Science.gov (United States)

    Marques, F. M. S. F.; Matildes, R.; Redweik, P.

    2013-12-01

    Sea cliff evolution is dominated by the occurrence of slope mass movements of different types and sizes, which are a considerable source of natural hazard, making their assessment a relevant issue in terms of human loss prevention and land use regulations. To address the assessment of the spatial component of sea cliff hazards, i.e. the susceptibility, a statistically based study was made to assess the capacity of a set of conditioning factors to express the occurrence of sea cliff failures affecting areas located along their top. The study was based on the application of the bivariate information value and multivariate logistic regression statistical methods, using a set of predisposing factors for cliff failures, mainly related to geology (lithology, bedding dip, faults) and geomorphology (maximum and mean slope, height, aspect, plan curvature, toe protection), which were correlated with a photogrammetry-based inventory of cliff failures that occurred in a 60 yr period (1947-2007). The susceptibility models were validated against the inventory data using standard success rate and ROC curves, and provided encouraging results, indicating that the proposed approaches are effective for susceptibility assessment. The results obtained also stress the need for improvement of the predisposing factors to be used in this type of study and the need for detailed and systematic cliff failure inventories.

  15. Circling particles and drafting in optical vortices

    OpenAIRE

    Reichert, Michael; Stark, Holger

    2004-01-01

    Particles suspended in a viscous fluid circle in optical vortices generated by holographic optical-tweezer techniques [Curtis J E and Grier D G 2003 Phys. Rev. Lett. 90 133901]. We model this system and show that hydrodynamic interactions between the circling particles determine their collective motion. We perform a linear-stability analysis to investigate the stability of regular particle clusters and illustrate the limit cycle to which the unstable modes converge. We clarify that drafting o...

  16. Fluctuations of Quantum Random Walks on Circles

    OpenAIRE

    Inui, Norio; Konishi, Yoshinao; Konno, Norio; Soshi, Takahiro

    2003-01-01

    Temporal fluctuations in the Hadamard walk on circles are studied. A temporal standard deviation of probability that a quantum random walker is positive at a given site is introduced to manifest striking differences between quantum and classical random walks. An analytical expression of the temporal standard deviation on a circle with odd sites is shown and its asymptotic behavior is considered for large system size. In contrast with classical random walks, the temporal fluctuation of quantum...

  17. The Cliffs of Time. Cliffs of the Neuse State Park. An Environmental Education Learning Experience, Designed for Grades 6-8.

    Science.gov (United States)

    O'Neal, Adrian

    This activity packet provides educators with a series of hands-on interdisciplinary classroom and outdoor education activities for grades 6-8 that focus on geology and prehistoric life at Cliffs of the Neuse State Park, North Carolina. The packet was designed to meet established curriculum objectives of the North Carolina Department of Public…

  18. Experiments Testing the Causes of Namibian Fairy Circles.

    Directory of Open Access Journals (Sweden)

    Walter R Tschinkel

    Full Text Available The grasslands on the sandy soils of the eastern edge of the Namib Desert of Namibia are strikingly punctuated by millions of mostly regularly-spaced circular bare spots 2 to 10 m or more in diameter, generally with a margin of taller grasses. The causes of these so called fairy circles are unknown, but several hypotheses have been advanced. In October 2009, we set up experiments that specifically tested four hypothesized causes, and monitored these 5 times between 2009 and 2015. Grass exclusion in circles due to seepage of subterranean vapors or gases was tested by burying an impermeable barrier beneath fairy circles, but seedling density and growth did not differ from barrier-less controls. Plant germination and growth inhibition by allelochemicals or nutrient deficiencies in fairy circle soils were tested by transferring fairy circle soil to artificially cleared circles in the grassy matrix, and matrix soil to fairy circles (along with circle to circle and matrix to matrix controls. None of the transfers changed the seedling density and growth from the control reference conditions. Limitation of plant growth due to micronutrient depletion within fairy circles was tested by supplementing circles with a micronutrient mixture, but did not result in differences in plant seedling density and growth. Short-range vegetation competitive feedbacks were tested by creating artificially-cleared circles of 2 or 4 m diameter located 2 or 6 m from a natural fairy circle. The natural circles remained bare and the artificial circles revegetated. These four experiments provided evidence that fairy circles were not caused by subterranean vapors, that fairy circle soil per se did not inhibit plant growth, and that the circles were not caused by micronutrient deficiency. There was also no evidence that vegetative feedbacks affected fairy circles on a 2 to 10 m scale. Landscape-scale vegetative self-organization is discussed as a more likely cause of fairy circles.

  19. Improved dust handling at Inco's Copper Cliff smelter

    International Nuclear Information System (INIS)

    The Cooper Cliff Smelter Complex comprises three major production departments - a Nickel Smelter for the processing of nickel concentrated to a low iron, nickel - copper sulphide (Bessemer) matte; a Matte Processing plant for the separation of matte sulphides and the production of market nickel oxides and refinery feeds and a Copper Smelter to process copper concentrates to blister copper. Annual production is currently -114,000 tonnes of copper as blister and -110,000 tonnes of nickel. The nickel concentrate (11-13% Ni, 2-3% Cu) is roasted in multi-hearth roasters, smelted in oxy-fuel fired reverberatory furnaces to a 30-35% CuNiCo matte and converted to Bessemer matte (75% CuNiCo) in Peirce-Smith converters. The Bessemer matte is slow cooled and crushed for subsequent separation by mineral dressing techniques in the Matte Processing plant into nickel (sulphide and metallic) concentrates and a copper (chalcocite) concentrate. Nickel sulphides are further processed in fluid bed reactors to oxide market product or refinery feedstock. The copper concentrate (29-30% Cu, 0.9% No.) is dried in fluid bed driers, smelted to a 40-50% copper matte in an Inco oxygen flash furnace and converted to blister copper in Peirce-Smith converters. The chalcocite concentrate from the matte separation stage is flash converted to a semi-blister (3-4% S, 4-5% Ni) and then finished to lighter conventionally. A schematic process flowsheet of the Smelter Complex is shown in this paper

  20. Packing circles and spheres on surfaces

    KAUST Repository

    Schiftner, Alexander

    2009-01-01

    Inspired by freeform designs in architecture which involve circles and spheres, we introduce a new kind of triangle mesh whose faces\\' incircles form a packing. As it turns out, such meshes have a rich geometry and allow us to cover surfaces with circle patterns, sphere packings, approximate circle packings, hexagonal meshes which carry a torsion-free support structure, hybrid tri-hex meshes, and others. We show how triangle meshes can be optimized so as to have the incircle packing property. We explain their relation to conformal geometry and implications on solvability of optimization. The examples we give confirm that this kind of meshes is a rich source of geometric structures relevant to architectural geometry. © 2009 ACM.

  1. ENTREPRENEURSHIP EDUCATION AND THE ECONOMY VICIOUS CIRCLES

    Directory of Open Access Journals (Sweden)

    MEDAR LUCIAN ION

    2015-06-01

    Full Text Available Education for sustainable development, involves training honest, active, social and creative persons for ensuring the link between environment, society, economy and politics. Trained entrepreneurs in sustainable development, are the engine system which can bring an economic prosperity. Lack of entrepreneurial education in the last 25 years has led accentuated conditions to avoiding economic development in all reference fields where added value can be achieved. Running away from excessive taxation led to the establishment of vicious circles in the economy. Vicious circles of the economy can be found in saving, tax policy, productive investment and the informal economy. Through this study will present the importance of entrepreneurship education in the real economy and some specifications to exit entrepreneurs from vicious circles of the economy.

  2. Packing circles and spheres on surfaces

    KAUST Repository

    Schiftner, Alexander

    2009-12-01

    Inspired by freeform designs in architecture which involve circles and spheres, we introduce a new kind of triangle mesh whose faces\\' incircles form a packing. As it turns out, such meshes have a rich geometry and allow us to cover surfaces with circle patterns, sphere packings, approximate circle packings, hexagonal meshes which carry a torsion-free support structure, hybrid tri-hex meshes, and others. We show how triangle meshes can be optimized so as to have the incircle packing property. We explain their relation to conformal geometry and implications on solvability of optimization. The examples we give confirm that this kind of meshes is a rich source of geometric structures relevant to architectural geometry.

  3. Generic Rigidity for Circle Diffeomorphisms with Breaks

    Science.gov (United States)

    Kocić, Saša

    2016-06-01

    We prove that {C^r}-smooth ({r > 2}) circle diffeomorphisms with a break, i.e., circle diffeomorphisms with a single singular point where the derivative has a jump discontinuity, are generically, i.e., for almost all irrational rotation numbers, not {C^{1+\\varepsilon}}-rigid, for any {\\varepsilon > 0}. This result complements our recent proof, joint with Khanin (Geom Funct Anal 24:2002-2028, 2014), that such maps are generically {C^1}-rigid. It stands in remarkable contrast to the result of Yoccoz (Ann Sci Ec Norm Sup 17:333-361, 1984) that {C^r}-smooth circle diffeomorphisms are generically {C^{r-1-κ}}-rigid, for any {κ > 0}.

  4. TRIPLET CIRCULAR HOUGH TRANSFORM FOR CIRCLE DETECTION

    Institute of Scientific and Technical Information of China (English)

    Luo Daisheng; He Xiaohai; Teng Qizhi; Tao Qingchuan

    2002-01-01

    A new method, triplet circular Hough transform, is proposed for circle detection in image processing and pattern recognition. In the method, a curve in an image is first detected.Next, a sequence of three points on the curve are selected, a sequence of parameters (a,b,r)corresponding to the three points are calculated by solving the circle equation of the curve, and two 2-D accumulators A(a,b) and R(a,b) are accumulated with 1 and r, respectively. Then the parameters {(a, b, r)} of the circles fitting the curve are determined from A(a, b) and R(a, b) by searching for the local maximum over A(a,b). Because no computation loops over center (a, b)and/or radius r are needed, the method is faster than the basic and directional gradient methods.It needs also much smaller memory for accumulation.

  5. Sea cliff instability susceptibility at regional scale: a statistically based assessment in southern Algarve, Portugal

    Directory of Open Access Journals (Sweden)

    F. M. S. F. Marques

    2013-05-01

    along their top. The study was based on the application of the bivariate Information Value and multivariate Logistic regression statistical methods, using a set of predisposing factors for cliff failures, mainly related with geology (lithology, bedding dip, faults and geomorphology (maximum and mean slope, height, aspect, plan curvature, toe protection which were correlated with a photogrammetry based inventory of cliff failures occurred in a 60 yr period (1947–2007. The susceptibility models were validated against the inventory data using standard success rate and ROC curves, and provided encouraging results, indicating that the proposed approaches are effective for susceptibility assessment. The results obtained also stress the need for improvement of the predisposing factors to be used in this type of studies and the need of detailed and systematic cliff failures inventories.

  6. Seismic precursory patterns before a cliff collapse and critical-point phenomena

    CERN Document Server

    Amitrano, David; Senfaute, Gloria

    2005-01-01

    We analyse the statistical pattern of seismicity before a 1-2 103 m3 chalk cliff collapse on the Normandie ocean shore, Western France. We show that a power law acceleration of seismicity rate and energy in both 40 Hz-1.5 kHz and 2 Hz-10kHz frequency range, is defined on 3 order of magnitude, within 2 hours from the collapse time. Simultaneously, the average size of the seismic events increases toward the time to failure. These in-situ results are derived from the only station located within one rupture length distance from the rock fall rupture plane. They mimic the "critical point" like behavior recovered from physical and numerical experiments before brittle failures and tertiary creep failures. Our analysis of this first seismic monitoring data of a cliff collapse suggests that the thermodynamic phase transition models for failure may apply for cliff collapse.

  7. On circle map coupled map lattice

    OpenAIRE

    2003-01-01

    The circle map in one and two dimensions is studied. Both its stability and synchronization, using a bounded control and persistence, are discussed. This work is expected to be applicable in ecology where spatial effects are known to be important. Also, it will be relevant to systems where delay effects are not negligible.

  8. Syllable Circles for Pronunciation Learning and Teaching

    Science.gov (United States)

    Whipple, John; Cullen, Charlie; Gardiner, Keith; Savage, Tim

    2015-01-01

    Syllable Circles are interactive visualizations representing prominence as a feature in short phrases or multi-syllable words. They were designed for computer-aided pronunciation teaching. This study explores whether and how interactive visualizations can affect language learners' awareness of prominence, or stress, in English pronunciation. The…

  9. Community Social Work and the Learning Circle

    Science.gov (United States)

    Lavan, Ann

    2008-01-01

    Outlines an approach for introducing students to Community Social Work by use of clear, engaging stated objectives. Approach is called the Learning Circle and was devised as a tool to enhance student participation and to stimulate networking, dialogue and conversation about social work commitment to community intervention and community-based…

  10. Conversations among Writers in Authors Circles.

    Science.gov (United States)

    Villaume, Susan Kidd; Brabham, Edna Greene

    2001-01-01

    Searches for examples of Authors Circles by talking with classroom teachers, surveying recent editions of this and other journals, and scanning library shelves for books on workshops and methods that incorporate student discussion with the teaching of writing. Discovers that descriptions of teacher-student conferences dominate explanations,…

  11. 75 FR 25876 - Notice of Intent To Prepare Resource Management Plans for the Beaver Dam Wash and Red Cliffs...

    Science.gov (United States)

    2010-05-10

    ... Bureau of Land Management Notice of Intent To Prepare Resource Management Plans for the Beaver Dam Wash... Dam Wash and the Red Cliffs National Conservation Areas and an amendment to the St. George Field... BLM SGFO, St. George, Utah intends to prepare RMPs for the Beaver Dam Wash and the Red Cliffs...

  12. 78 FR 4467 - UniStar Nuclear Energy, Combined License Application for Calvert Cliffs Power Plant, Unit 3...

    Science.gov (United States)

    2013-01-22

    ... From the Federal Register Online via the Government Publishing Office NUCLEAR REGULATORY COMMISSION UniStar Nuclear Energy, Combined License Application for Calvert Cliffs Power Plant, Unit 3, Exemption 1.0 Background UniStar Nuclear Energy (UNE), on behalf of Calvert Cliffs Nuclear Project, LLC and UniStar Nuclear Operating Services,...

  13. Assessing species habitat using Google Street View: a case study of cliff-nesting vultures.

    Directory of Open Access Journals (Sweden)

    Pedro P Olea

    Full Text Available The assessment of a species' habitat is a crucial issue in ecology and conservation. While the collection of habitat data has been boosted by the availability of remote sensing technologies, certain habitat types have yet to be collected through costly, on-ground surveys, limiting study over large areas. Cliffs are ecosystems that provide habitat for a rich biodiversity, especially raptors. Because of their principally vertical structure, however, cliffs are not easy to study by remote sensing technologies, posing a challenge for many researches and managers working with cliff-related biodiversity. We explore the feasibility of Google Street View, a freely available on-line tool, to remotely identify and assess the nesting habitat of two cliff-nesting vultures (the griffon vulture and the globally endangered Egyptian vulture in northwestern Spain. Two main usefulness of Google Street View to ecologists and conservation biologists were evaluated: i remotely identifying a species' potential habitat and ii extracting fine-scale habitat information. Google Street View imagery covered 49% (1,907 km of the roads of our study area (7,000 km². The potential visibility covered by on-ground surveys was significantly greater (mean: 97.4% than that of Google Street View (48.1%. However, incorporating Google Street View to the vulture's habitat survey would save, on average, 36% in time and 49.5% in funds with respect to the on-ground survey only. The ability of Google Street View to identify cliffs (overall accuracy = 100% outperformed the classification maps derived from digital elevation models (DEMs (62-95%. Nonetheless, high-performance DEM maps may be useful to compensate Google Street View coverage limitations. Through Google Street View we could examine 66% of the vultures' nesting-cliffs existing in the study area (n = 148: 64% from griffon vultures and 65% from Egyptian vultures. It also allowed us the extraction of fine-scale features of

  14. Soft-Cliff Retreat, Self-Organized Critical Phenomena in the Limit of Predictability?

    Science.gov (United States)

    Paredes, Carlos; Godoy, Clara; Castedo, Ricardo

    2015-03-01

    The coastal erosion along the world's coastlines is a natural process that occurs through the actions of marine and subaerial physico-chemical phenomena, waves, tides, and currents. The development of cliff erosion predictive models is limited due to the complex interactions between environmental processes and material properties over a wide range of temporal and spatial scales. As a result of this erosive action, gravity driven mass movements occur and the coastline moves inland. Like other studied earth natural and synthetically modelled phenomena characterized as self-organized critical (SOC), the recession of the cliff has a seemingly random, sporadic behavior, with a wide range of yearly recession rate values probabilistically distributed by a power-law. Usually, SOC systems are defined by a number of scaling features in the size distribution of its parameters and on its spatial and/or temporal pattern. Particularly, some previous studies of derived parameters from slope movements catalogues, have allowed detecting certain SOC features in this phenomenon, which also shares the recession of cliffs. Due to the complexity of the phenomenon and, as for other natural processes, there is no definitive model of recession of coastal cliffs. In this work, various analysis techniques have been applied to identify SOC features in the distribution and pattern to a particular case: the Holderness shoreline. This coast is a great case study to use when examining coastal processes and the structures associated with them. It is one of World's fastest eroding coastlines (2 m/yr in average, max observed 22 m/yr). Cliffs, ranging from 2 m up to 35 m in height, and made up of glacial tills, mainly compose this coast. It is this soft boulder clay that is being rapidly eroded and where coastline recession measurements have been recorded by the Cliff Erosion Monitoring Program (East Riding of Yorkshire Council, UK). The original database has been filtered by grouping contiguous

  15. A Spring Playscape Project: Building a Tree Circle

    Science.gov (United States)

    Keeler, Rusty

    2009-01-01

    The Tree Circle is a green gathering area for children made by planting trees in a circle. For children, the Tree Circle becomes a magical place for dramatic play, quiet retreat, or lively nature exploration. For teachers and parents it becomes a shady grove for snacks and stories. The trees create a sweet spot that changes during the seasons and…

  16. Multiple Intelligence Literature Circles: A JFL and an EFL Experience

    Science.gov (United States)

    Sai, Michiko; Hsu, Jeng-yih

    2007-01-01

    The idea of literature circles is not new; however, it is hardly adapted in a second language classroom. In Taiwan, using literature circles to teach a second/foreign language is even less seen. The two college teachers-researchers reported their experiences of trying out literature circles in a JFL (Japanese as a Foreign Language) and an EFL…

  17. Cliffs used as communal roosts by Andean condors protect the birds from weather and predators.

    Directory of Open Access Journals (Sweden)

    Sergio A Lambertucci

    Full Text Available The quality and availability of resources influence the geographical distribution of species. Social species need safe places to rest, meet, exchange information and obtain thermoregulatory benefits, but those places may also serve other important functions that have been overlooked in research. We use a large soaring bird that roosts communally in cliffs, the Andean condor (Vultur gryphus, as a model species to elucidate whether roost locations serve as a refuge from adverse weather conditions (climatic refuge hypothesis, CRH, and/or from predators or anthropogenic disturbances (threats refuge hypothesis, TRH. The CRH predicts that communal roosts will face in the opposite direction from where storms originate, and will be located in climatically stable, low precipitation areas. The TRH predicts that communal roosts will be large, poorly accessible cliffs, located far from human-made constructions. We surveyed cliffs used as communal roosts by condors in northwestern Patagonia, and compared them with alternative non-roosting cliffs to test these predictions at local and regional scales. We conclude that communal roosting places provide refuge against climate and disturbances such as, for instance, the threats of predators (including humans. Thus, it is not only the benefits gained from being aggregated per se, but the characteristics of the place selected for roosting that may both be essential for the survival of the species. This should be considered in management and conservation plans given the current scenario of global climate change and the increase in environmental disturbances.

  18. 76 FR 22935 - Calvert Cliffs Nuclear Power Plant, LLC Independent Spent Fuel Storage Installation; Notice of...

    Science.gov (United States)

    2011-04-25

    ... Class C (GTCC) waste and other radioactive materials associated with spent fuel storage at the CCNPP... granted, the renewed license will authorize the applicant to continue to store spent fuel in a dry cask... COMMISSION Calvert Cliffs Nuclear Power Plant, LLC Independent Spent Fuel Storage Installation; Notice...

  19. 75 FR 60147 - Calvert Cliffs Nuclear Power Plant, LLC; Independent Spent Fuel Storage Installation; Notice of...

    Science.gov (United States)

    2010-09-29

    ... COMMISSION Calvert Cliffs Nuclear Power Plant, LLC; Independent Spent Fuel Storage Installation; Notice of... Branch, Division of Spent Fuel Storage and Transportation, Office of Nuclear Material Safety and... Independent Spent Fuel Storage Installation (ISFSI) Technical Specifications (TS) be revised as follows: 1....

  20. Experimental infection of cliff swallows (Petrochelidon pyrrhonota) with varying doses of West Nile virus

    Science.gov (United States)

    Oesterle, P.T.; Nemeth, N.M.; VanDalen, Kaci K.; Sullivan, H.; Bentler, K.T.; Young, G.R.; McLean, R.G.; Clark, L.; Smeraski, C.; Hall, J.S.

    2009-01-01

    Cliff swallows (Petrochelidon pyrrhonota) were inoculated with differing doses of West Nile virus (WNV) to evaluate their potential role as reservoir hosts in nature. Swallows often nest in large colonies in habitats and months associated with high mosquito abundance and early WNV transmission in North America. Additionally, cliff swallow diet consists of insects, including mosquitoes, leading to an additional potential route of WNV infection. The average peak viremia titer among infected cliff swallows was 106.3 plaque-forming units (PFU)/mL serum and the reservoir competence index was 0.34. There was no correlation between dose and probability of becoming infected or viremia peak and duration. Oral shedding was detected from 2 to 14 days post-inoculation with an average peak titer of 1044 PFU/swab. These results suggest that cliff swallows are competent reservoir hosts of WNV and therefore, they may play a role in early seasonal amplification and maintenance of WNV. Copyright ?? 2009 by The American Society of Tropical Medicine and Hygiene.

  1. Cliff or Step? Posture-Specific Learning at the Edge of a Drop-Off

    Science.gov (United States)

    Kretch, Kari S.; Adolph, Karen E.

    2013-01-01

    Infants require locomotor experience to behave adaptively at a drop-off. However, different experimental paradigms (visual cliff and actual gaps and slopes) have generated conflicting findings regarding what infants learn and the specificity of their learning. An actual, adjustable drop-off apparatus was used to investigate whether learning to…

  2. The Cliff Reconnaissance Vehicle: a tool to improve astronaut exploration efficiency.

    Science.gov (United States)

    Souchier, Alain

    2014-05-01

    The close examination of cliff strata on Mars may reveal important information about conditions that existed in the past on that planet. To have access to such difficult-to-reach locations, the Association Planète Mars (France) has, since 2001, been experimenting with designs of manually operated, instrumented vehicles capable of being lowered down the faces of cliffs. The latest tests in the series in which the Cliff Reconnaissance Vehicle (CRV) or Cliffbot was used were conducted as part of the Austrian Space Forum's MARS2013 field analog project in Morocco in February 2013. Experimentation centered on vehicle configuration for maximum all-terrain capabilities; operational procedures, which included use while the operator was wearing an analog space suit; and imaging, mapping, and geological/biological feature detection capabilities. The exercise demonstrated that Cliffbot is capable of examining hard-to-reach rock strata in cliff faces but that it needs further mechanical modification to improve its ability to overcome some particular terrain obstacles and situational awareness by the operator. PMID:24823801

  3. Cliff Collapse Hazard from Repeated Multicopter Uav Acquisitions: Return on Experience

    Science.gov (United States)

    Dewez, T. J. B.; Leroux, J.; Morelli, S.

    2016-06-01

    Cliff collapse poses a serious hazard to infrastructure and passers-by. Obtaining information such as magnitude-frequency relationship for a specific site is of great help to adapt appropriate mitigation measures. While it is possible to monitor hundreds-of-meter-long cliff sites with ground based techniques (e.g. lidar or photogrammetry), it is both time consuming and scientifically limiting to focus on short cliff sections. In the project SUAVE, we sought to investigate whether an octocopter UAV photogrammetric survey would perform sufficiently well in order to repeatedly survey cliff face geometry and derive rock fall inventories amenable to probabilistic rock fall hazard computation. An experiment was therefore run on a well-studied site of the chalk coast of Normandy, in Mesnil Val, along the English Channel (Northern France). Two campaigns were organized in January and June 2015 which surveyed about 60 ha of coastline, including the 80-m-high cliff face, the chalk platform at its foot, and the hinterland in a matter of 4 hours from start to finish. To conform with UAV regulations, the flight was flown in 3 legs for a total of about 30 minutes in the air. A total of 868 and 1106 photos were respectively shot with a Sony NEX 7 with fixed focal 16mm. Three lines of sight were combined: horizontal shots for cliff face imaging, 45°-oblique views to tie plateau/platform photos with cliff face images, and regular vertical shots. Photogrammetrically derived dense point clouds were produced with Agisoft Photoscan at ultra-high density (median density is 1 point every 1.7cm). Point cloud density proved a critical parameter to reproduce faithfully the chalk face's geometry. Tuning down the density parameter to "high" or "medium", though efficient from a computational point of view, generated artefacts along chalk bed edges (i.e. smoothing the sharp gradient) and ultimately creating ghost volumes when computing cloud to cloud differences. Yet, from a hazard point of

  4. Circle Points Discharge Tube Current Controller

    Institute of Scientific and Technical Information of China (English)

    Meng Jinjia; Meng Lisheng

    2005-01-01

    Circle points discharge tube current controller is a new type device to limit theoutput of high voltage discharge current. Circle points uniform corona discharge to form airionization current in the discharge tube. On the outside, even if the discharge electrode is sparkdischarging or the two discharge electrodes are short circuited, the air ionization current in the tuberemains within a stable range, and there is no spark discharge. In this case, when the dischargecurrent only increases slightly, the requirement to limited current is obtained. By installing thecontroller at a discharge pole with a small power but high voltage supply, we can realize the shiftbetween the continuous spark line discharge and corona discharge. This provides a new simpledevice for spark discharge research and is a supplement to the Townsend discharge experiment.

  5. CHARACTERISTICS OF HYDROCARBON EXPLOITATION IN ARCTIC CIRCLE

    Directory of Open Access Journals (Sweden)

    Vanja Lež

    2013-12-01

    Full Text Available The existence of large quantities of hydrocarbons is supposed within the Arctic Circle. Assumed quantities are 25% of the total undiscovered hydrocarbon reserves on Earth, mostly natural gas. Over 500 major and minor gas accumulations within the Arctic Circle were discovered so far, but apart from Snøhvit gas field, there is no commercial exploitation of natural gas from these fields. Arctic gas projects are complicated, technically hard to accomplish, and pose a great threat to the return of investment, safety of people and equipment and for the ecosystem. Russia is a country that is closest to the realization of the Arctic gas projects that are based on the giant gas fields. The most extreme weather conditions in the seas around Greenland are the reason why this Arctic region is the least explored and furthest from the realization of any gas project (the paper is published in Croatian .

  6. The Bakhtin Circle and Applied Linguistics

    Directory of Open Access Journals (Sweden)

    Newton Duarte Molon

    2012-11-01

    Full Text Available This article aims at presenting the relations between the theoretical formulations of the Bakhtin Circle and the current discussion on the scope of the so called Applied Linguistics (AL. In order to do that, we will briefly outline the history of AL, present the main conceptions of the Bakhtin Circle‟s thought, and build possible dialogues between the theoretical formulations of the Russian thinkers and the main issues of the current debate in Applied Linguistics.

  7. Telomeric circles: universal players in telomere maintenance?

    OpenAIRE

    Tomaska, Lubomir; Nosek, Jozef; Kramara, Juraj; Griffith, Jack D.

    2009-01-01

    To maintain linear DNA genomes, organisms have evolved numerous means of solving problems associated with DNA ends (telomeres), including telomere-associated retrotransposons, palindromes, hairpins, covalently bound proteins and the addition of arrays of simple DNA repeats. Telomeric arrays can be maintained through various mechanisms such as telomerase activity or recombination. The recombination-dependent maintenance pathways may include telomeric loops (t-loops) and telomeric circles (t-ci...

  8. Sleep disturbances and PTSD: a perpetual circle?

    OpenAIRE

    Saskia van Liempt

    2012-01-01

    Background : Sleep facilitates the consolidation of fear extinction memory. Nightmares and insomnia are hallmark symptoms of posttraumatic stress disorder (PTSD), possibly interfering with fear extinction and compromising recovery. A perpetual circle may develop when sleep disturbances increase the risk for PTSD and vice versa. To date, therapeutic options for alleviating sleep disturbances in PTSD are limited. Methods : We conducted three studies to examine the relationship between sleep and...

  9. The Bakhtin Circle and Applied Linguistics

    OpenAIRE

    Newton Duarte Molon; Rodolfo Vianna

    2012-01-01

    This article aims at presenting the relations between the theoretical formulations of the Bakhtin Circle and the current discussion on the scope of the so called Applied Linguistics (AL). In order to do that, we will briefly outline the history of AL, present the main conceptions of the Bakhtin Circle‟s thought, and build possible dialogues between the theoretical formulations of the Russian thinkers and the main issues of the current debate in Applied Linguistics.

  10. Rolling circle amplification of metazoan mitochondrialgenomes

    Energy Technology Data Exchange (ETDEWEB)

    Simison, W. Brian; Lindberg, D.R.; Boore, J.L.

    2005-07-31

    Here we report the successful use of rolling circle amplification (RCA) for the amplification of complete metazoan mt genomes to make a product that is amenable to high-throughput genome sequencing techniques. The benefits of RCA over PCR are many and with further development and refinement of RCA, the sequencing of organellar genomics will require far less time and effort than current long PCR approaches.

  11. Walking in circles: a modelling approach.

    Science.gov (United States)

    Maus, Horst-Moritz; Seyfarth, Andre

    2014-10-01

    Blindfolded or disoriented people have the tendency to walk in circles rather than on a straight line even if they wanted to. Here, we use a minimalistic walking model to examine this phenomenon. The bipedal spring-loaded inverted pendulum exhibits asymptotically stable gaits with centre of mass (CoM) dynamics and ground reaction forces similar to human walking in the sagittal plane. We extend this model into three dimensions, and show that stable walking patterns persist if the leg is aligned with respect to the body (here: CoM velocity) instead of a world reference frame. Further, we demonstrate that asymmetric leg configurations, which are common in humans, will typically lead to walking in circles. The diameter of these circles depends strongly on parameter configuration, but is in line with empirical data from human walkers. Simulation results suggest that walking radius and especially direction of rotation are highly dependent on leg configuration and walking velocity, which explains inconsistent veering behaviour in repeated trials in human data. Finally, we discuss the relation between findings in the model and implications for human walking. PMID:25056215

  12. TRIPLET CIRCULAR HOUGH TRANSFORM FOR CIRCLE DETECTION

    Institute of Scientific and Technical Information of China (English)

    LuoDaisheng; HeXiaohai; 等

    2002-01-01

    A new method,triplet circular Hough transform,is proposed for circle detection in image processing and pattern recognition.In the method,a curve in an image is first detected.Next,a sequence of three points on the curve are selected.a sequence of parameters(a,b,r)corresponding to the three points are calculated by solving the circle equation of the curve,and two 2-D accumulators A(a,b)and R(a,b)are accumulated with 1 and r,respectively,Then the parameters{(a,b,r)}of the circles fitting the curve are determined from A(a,b)and R(a,b) by searching for the local maximum over A(a,b).Because no computation loops over center(a,b) and/or radius r are needed,the method is faster than the basic and directional gradient methods It needs also much smaller memory for accumulation.

  13. Detection of morphological changes in cliff face surrounding a waterfall using terrestrial laser scanning and unmanned aerial system

    Science.gov (United States)

    Hayakawa, Yuichi S.; Obanawa, Hiroyuki

    2015-04-01

    Waterfall or bedrock knickpoint appears as an erosional front in bedrock rivers forming deep v-shaped valley downstream. Following the rapid fluvial erosion of waterfall, rockfalls and gravita-tional collapses often occur in surrounding steep cliffs. Although morphological changes of such steep cliffs are sometimes visually observed, quantitative and precise measurements of their spatio-temporal distribution have been limited due to the difficulties in direct access to such cliffs if with classical measurement methods. However, for the clarification of geomorphological processes oc-curring in the cliffs, multi-temporal mapping of the cliff face at a high resolution is necessary. Re-mote sensing approaches are therefore suitable for the topographic measurements and detection of changes in such inaccessible cliffs. To achieve accurate topographic mapping of cliffs around a wa-terfall, here we perform multi-temporal terrestrial laser scanning (TLS), as well as structure-from-motion multi-view stereo (SfM-MVS) photogrammetry based on unmanned aerial system (UAS). The study site is Kegon Falls in central Japan, having a vertical drop of surface water from top of its overhanging cliff, as well as groundwater outflows from its lower portions. The bedrock is composed of alternate layers of andesite lava and conglomerates. Minor rockfalls in the cliffs are often ob-served by local people. The latest major rockfall occurred in 1986, causing ca. 8-m upstream propa-gation of the waterfall lip. This provides a good opportunity to examine the changes in the surround-ing cliffs following the waterfall recession. Multi-time point clouds were obtained by TLS measure-ment over years, and the three-dimensional changes of the rock surface were detected, uncovering the locus of small rockfalls and gully developments. Erosion seems particularly frequent in relatively weak the conglomerates layer, whereas small rockfalls seems to have occurred in the andesite layers. Also, shadows in the

  14. A localized corrosion assessment of 6% molybdenum stainless steel condenser tubing at the Calvert Cliffs Nuclear Power Plant

    International Nuclear Information System (INIS)

    A condition assessment was performed on the Calvert Cliffs Nuclear Power Plant Unit 1 Main Steam Condenser 6% molybdenum stainless steel tubing. This work consisted of eddy current (EC) examination, in-situ visual examination of tubes, and destructive analysis of pulled tubes. The assessment objectives were as follows: to determine the tubing degradation mechanism, to render the condenser leak-tight, to identify methods of improving condenser life management, and to develop a basis for projecting the remaining condenser life. Once the corrosion mechanism was identified, seawater corrosion tests were performed on UNS N08366 and N08367 tubing using vinyl sleeves, Type 316 stainless compression fittings, and epoxy paint as crevice formers. Based on eddy current examination results, greater than 95% of the 49,500 tubes in the condenser had no detectable degradation. Over 1,200 tubes were plugged with either eddy current indications measuring greater than 60% wall loss or with obstructions. One waterbox (11A) contained 52% of all eddy current indications with over half of these in one section (B). Destructive analysis of pulled tubes revealed crevice corrosion, a form of localized corrosion that initiated under deposits. This type of corrosion occurred most often and had the deepest penetration in the weld seam. This was attributed to molybdenum and chromium segregation in the as-welded tubes and to deleterious secondary phases formed during weld solidification

  15. Estimation of pure qubits on circles

    International Nuclear Information System (INIS)

    Gisin and Popescu (Gisin N and Popescu S 1999 Phys. Rev. Lett. 83 432) have shown that more information about their direction can be obtained from a pair of anti-parallel spins compared to a pair of parallel spins, where the first member of the pair (which we call the pointer member) can point equally along any direction in the Bloch sphere. They argued that this was due to the difference in dimensionality spanned by these two alphabets of states. Here we consider similar alphabets, but with the first spin restricted to a fixed small circle of the Bloch sphere. In this case, the dimensionality spanned by the anti-parallel versus parallel alphabet is now equal. However, the anti-parallel alphabet is found to still contain more information in general. We generalize this to having N parallel spins and M anti-parallel spins. When the pointer member is restricted to a small circle these alphabets again span spaces of equal dimension, yet in general, more directional information can be found for sets with smaller |N - M| for any fixed total number of spins. We find that the optimal POVMs for extracting directional information in these cases can always be expressed in terms of the Fourier basis. Our results show that dimensionality alone cannot explain the greater information content in anti-parallel combinations of spins compared to parallel combinations. In addition, we describe an LOCC protocol which extracts optimal directional information when the pointer member is restricted to a small circle and a pair of parallel spins are supplied

  16. Circle Maps and C*-algebras

    DEFF Research Database (Denmark)

    Schmidt, Thomas Lundsgaard; Thomsen, Klaus

    2015-01-01

    We consider a construction of $C^*$-algebras from continuous piecewise monotone maps on the circle which generalizes the crossed product construction for homeomorphisms and more generally the construction of Renault, Deaconu and Anantharaman-Delaroche for local homeomorphisms. Assuming that the map...... is surjective and not locally injective we give necessary and sufficient conditions for the simplicity of the $C^*$-algebra and show that it is then a Kirchberg algebra. We provide tools for the calculation of the K-theory groups and turn them into an algorithmic method for Markov maps....

  17. QUALITY CIRCLE AN EFFECTIVE MANAGEMENT TOOL

    Directory of Open Access Journals (Sweden)

    UDAYSINH R. MANEPATIL

    2013-01-01

    Full Text Available ''A Quality Circle is volunteer group composed of members who meet to talk about workplace and service improvements and make presentations to their management with their ideas. These are related especially to the quality of output or services in order to improve the performance of the organization / department and motivate and enrich the work of employees. This group carries on continuously as a part of organization-wide control activities, self and mutual developments and control and improvement within the workplace utilizing quality control techniques with all the members participating.

  18. Cliff´s Delta Calculator: A non-parametric effect size program for two groups of observations

    OpenAIRE

    Guillermo Macbeth; Eugenia Razumiejczyk; Rubén Daniel Ledesma

    2011-01-01

    The Cliff´s Delta statistic is an effect size measure that quantifies the amount of difference between two non-parametric variables beyond p-values interpretation. This measure can be understood as a useful complementary analysis for the corresponding hypothesis testing. During the last two decades the use of effect size measures has been strongly encouraged by methodologists and leading institutions of behavioral sciences. The aim of this contribution is to introduce the Cliff´s Delta Calcul...

  19. Implementation of a Geographical Information System. GIS, in the Natural National Park, Cliffs of Cali

    International Nuclear Information System (INIS)

    The objective of this project was to generate a tool to improve the handling, conservation and administration of the Park National Natural - Cliffs of Cali, belonging to the Special Administrative Unit of the System of Natural National Parks, UAESPNN, of the Ministry of the Environment. With this purpose it was implemented a System of Geographical Information, GIS, like methodological model. The GIS; Cliffs of Cali used a database relational, developed with the software ACCESS tm, compatible with the used GIS Arc/INFO tm and Arc/View tm (for work station). The data space accessed to the database were those of topography, hydrology, areas of life, geology, limit, fronts, to zone with handling ends, precipitation, indigenous occupation and municipalities; it contain related alphanumeric information, administrative, socioeconomic handling and physique among others

  20. Expanding Circles within the Outer Circle: The Rural Kisii in Kenya

    Science.gov (United States)

    Michieka, Martha M.

    2009-01-01

    This paper evaluates a range of factors that have contributed to the limited spread of English to rural Kisii, Kenya, making the presence of English in this non-urban context fall closer to an English as a Foreign Language (EFL) or Expanding Circle continuum than to the expected English as a Second Language (ESL) context. Kenya is an Outer Circle…

  1. Perturbing the hexagonal circle packing: a percolation perspective

    CERN Document Server

    Benjamini, Itai

    2011-01-01

    We consider the hexagonal circle packing with radius 1/2 and perturb it by letting the circles move as independent Brownian motions for time t. It is shown that, for small enough t, the union of the circles will contain an infinite connected component (module a Monte Carlo estimate for a fixed high dimensional integral). On the other hand, if \\Pi_t is the point process induced by the center of the circles at time t, then, as t goes to infinity, the critical radius for circles centered at \\Pi_t to contain an infinite component converges to that of continuum percolation (which was shown---module a Monte Carlo estimate---by Balister, Bollobas and Walters to be strictly bigger than 1/2). We conjecture the existence of a deterministic critical time marking a phase transition for the existence of an infinite component of the union of the circles. Further open problems are discussed.

  2. Cliff swallows Petrochelidon pyrrhonota as bioindicators of environmental mercury, Cache Creek Watershed, California

    Science.gov (United States)

    Hothem, R.L.; Trejo, B.S.; Bauer, M.L.; Crayon, J.J.

    2008-01-01

    To evaluate mercury (Hg) and other element exposure in cliff swallows (Petrochelidon pyrrhonota), eggs were collected from 16 sites within the mining-impacted Cache Creek watershed, Colusa, Lake, and Yolo counties, California, USA, in 1997-1998. Nestlings were collected from seven sites in 1998. Geometric mean total Hg (THg) concentrations ranged from 0.013 to 0.208 ??g/g wet weight (ww) in cliff swallow eggs and from 0.047 to 0.347 ??g/g ww in nestlings. Mercury detected in eggs generally followed the spatial distribution of Hg in the watershed based on proximity to both anthropogenic and natural sources. Mean Hg concentrations in samples of eggs and nestlings collected from sites near Hg sources were up to five and seven times higher, respectively, than in samples from reference sites within the watershed. Concentrations of other detected elements, including aluminum, beryllium, boron, calcium, manganese, strontium, and vanadium, were more frequently elevated at sites near Hg sources. Overall, Hg concentrations in eggs from Cache Creek were lower than those reported in eggs of tree swallows (Tachycineta bicolor) from highly contaminated locations in North America. Total Hg concentrations were lower in all Cache Creek egg samples than adverse effects levels established for other species. Total Hg concentrations in bullfrogs (Rana catesbeiana) and foothill yellow-legged frogs (Rana boylii) collected from 10 of the study sites were both positively correlated with THg concentrations in cliff swallow eggs. Our data suggest that cliff swallows are reliable bioindicators of environmental Hg. ?? Springer Science+Business Media, LLC 2007.

  3. In the vicious circle of fear

    International Nuclear Information System (INIS)

    Fear is the great driving force, the basic effect, without which there would be no adaption to new living conditions, and no provision for the future. But fear has a positive influence only as long as it does not gain the upper hand, for then it makes human beings blind and stifles activity. What is important, and will remain so, is the equilibrium between fear and courage, caution and the desire for action, optimism und pessimism. This equilibrium has now been disturbed in the western countries - and only here. Our present fears give rise to hardly any positive measures, but prevent provision for the future. We are threatened with failure due to the manipulated conversion of fear from the maintenance of life to an effect which destroys life. In this way we got into a vicious circle of fear: we must try to weaken the imagined dangers by emphasising the true conditions. The author discusses how the viscious circle can be broken. (orig.) 891 UA/orig. 892 MKO

  4. Parallelization Research of Circle Detection Based on Hough Transform

    OpenAIRE

    Suping Wu; Xiangjiao Liu

    2012-01-01

    There is a problem of too long computation time in Circle detection of Hough transform. In this paper, two paralleled methods are given based on Threading Building Blocks (TBB) and CUDA, by utilizing multi-core and GPU, the most timeconsuming part of circle detection is coped with parallelization. Experimental results show that the circle detection algorithms proposed in this paper has extremely good result of acceleration.

  5. Locating a general minisum 'circle' on a plane

    DEFF Research Database (Denmark)

    Brimberg, Jack; Juel, Henrik; Körner, Mark-Christoph;

    2011-01-01

    We approximate a set of given points in the plane by the boundary of a convex and symmetric set which is the unit circle of some norm. This generalizes previous work on the subject which considers Euclidean circles only. More precisely, we examine the problem of locating and scaling the unit circle...... of some given norm k with respect to given points on the plane such that the sum of weighted distances (as measured by the same norm k) between the circumference of the circle and the points is minimized. We present general results and are able to identify a finite dominating set in the case that k...

  6. Locating a circle on the plane using the minimax criterion

    DEFF Research Database (Denmark)

    Brimberg, Jack; Juel, Henrik; Schöbel, Anita

    2009-01-01

    We consider the problem of locating a circle with respect to existing facilities on the plane, such that the largest weighted distance between the circumference of the circle and the facilities is minimized. The problem properties are analyzed, and a solution procedure proposed......We consider the problem of locating a circle with respect to existing facilities on the plane, such that the largest weighted distance between the circumference of the circle and the facilities is minimized. The problem properties are analyzed, and a solution procedure proposed...

  7. GENERATING FRACTAL PATTERNS BY USING p-CIRCLE INVERSION

    Science.gov (United States)

    Ramírez, José L.; Rubiano, Gustavo N.; Zlobec, Borut Jurčič

    2015-10-01

    In this paper, we introduce the p-circle inversion which generalizes the classical inversion with respect to a circle (p = 2) and the taxicab inversion (p = 1). We study some basic properties and we also show the inversive images of some basic curves. We apply this new transformation to well-known fractals such as Sierpinski triangle, Koch curve, dragon curve, Fibonacci fractal, among others. Then we obtain new fractal patterns. Moreover, we generalize the method called circle inversion fractal be means of the p-circle inversion.

  8. Existence of Chimera State on Two Parallel Circles

    Science.gov (United States)

    Lin, Larry; Yang, Pei-Kun

    2016-06-01

    A nonlocal coupling system with oscillators on two parallel circles can evolve into a chimera state for suitable values of the parameters α and β. The parameter β is the distance between the circles and affects the phase-locked areas of the chimera state. The Kuramoto theory successfully describes whether and where the oscillators are phase-locked or drifting. The position difference ΔX describes the displacement of phase-locked areas between the circles. The dynamics of the model with four oscillators also show similar phenomena. The position difference ΔX results from the arrangement of oscillators on the two parallel circles.

  9. Meromorphic Vector Fields and Circle Packings

    DEFF Research Database (Denmark)

    Dias, Kealey

    The objective of the Ph.D. project is to initiate a classification of bifurcations of meromorphic vector fields and to clarify their relation to circle packings. Technological applications are to image analysis and to effective grid generation using discrete conformal mappings. The two branches of...... dynamical systems, continuous and discrete, correspond to the study of differential equations (vector fields) and iteration of mappings respectively. In holomorphic dynamics, the systems studied are restricted to those described by holomorphic (complex analytic) functions or meromorphic (allowing poles as...... singularities) functions. There already exists a well-developed theory for iterative holomorphic dynamical systems, and successful relations found between iteration theory and flows of vector fields have been one of the main motivations for the recent interest in holomorphic vector fields. Restricting to...

  10. The Six-Point Circle Theorem

    CERN Document Server

    Mitrea, Adrian

    2010-01-01

    Given $\\Delta ABC$ and angles $\\alpha,\\beta,\\gamma\\in(0,\\pi)$ with $\\alpha+\\beta+\\gamma=\\pi$, we study the properties of the triangle $DEF$ which satisfies: (i) $D\\in BC$, $E\\in AC$, $F\\in AB$, (ii) $\\aangle D=\\alpha$, $\\aangle E=\\beta$, $\\aangle F=\\gamma$, (iii) $\\Delta DEF$ has the minimal area in the class of triangles satisfying (i) and (ii). In particular, we show that minimizer $\\Delta DEF$, exists, is unique and is a pedal triangle, corresponding to a certain pedal point $P$. Permuting the roles played by the angles $\\alpha,\\beta,\\gamma$ in (ii), yields a total of six such area-minimizing triangles, which are pedal relative to six pedal points, say, $P_1,....,P_6$. The main result of the paper is the fact that there exists a circle which contains all six points.

  11. Fast transport optimization on the circle

    CERN Document Server

    Delon, Julie; Sobolevskii, Andrei

    2009-01-01

    Consider the problem of optimally matching two measures on the circle, or equivalently two periodic measures on the real line, and suppose the cost of matching two points satisfies the Monge condition. We introduce a notion of locally optimal transport plan, motivated by the weak KAM (Aubry-Mather) theory, and show that all locally optimal transport plans are conjugate to shifts. This theory is applied to a transportation problem arising in image processing: for two sets of point masses, both of which have the same total mass, find an optimal transport plan with respect to a given cost function that satisfies the Monge condition. For the case of N real-valued point masses we present an O(N log epsilon) algorithm that approximates the optimal cost within epsilon; when all masses are integer multiples of 1/M, the algorithm gives an exact solution in O(N log M) operations.

  12. KNOWLEDGE OF JOURNALISM IN THE HERMENEUTIC CIRCLE

    Directory of Open Access Journals (Sweden)

    Christa Berger

    2010-12-01

    Full Text Available In the letters written by Voltaire, Juan Luis Cebrián and AlbertoDines, I find a wisdom originating from experience which istransformed into knowledge for the practice of the profession.In this wisdom there are signs that journalism dialogues with thedisciplines of the social sciences and of language, at the same time that their authors point out the issues which will be transformed into the subject for study according to the theories of journalism. From the wisdom of experience to scientific practice and from the latter to the practice of the profession there is a circulation of knowledge which, in this article, I place in the perspective of thehermeneutic circle indicated by Boaventura de Souza Santos.

  13. Distribution of Circles on a Circle and Correlation Between Vortex Rings of Superfluids

    Science.gov (United States)

    Onur Fen, Mehmet; Erkoç, Šakír

    2007-05-01

    Superfluids are characterized by absence of viscosity. When superfluids are rotated, differently from normal fluids, they form more than one vortex in the containers where they are placed. The number of vortices change as the rotation velocity changes, but this change is not linear. M.W. Zwierlein et al. observed the vortices in experiments, observing up to a number of 80. Experiments also showed that the vortex distributions cannot include large spaces. By using experimental data, we noticed that when we think of vortices as vortex rings, their centers are at the same geometric location and these geometric locations are concentric circles. We generalized the distribution of these geometric places and formulized it. Our formula includes the magic circle numbers. When the number of vortices reach these magic numbers, the number of geometric locations increase by 1.

  14. An Effective Time and Management Strategy in Quality Circles.

    Science.gov (United States)

    Halverson, Don E.

    Contending that participation in quality circles enhances effective time management by school administrators and teachers, this guide provides both a theoretical briefing and practical recommendations for better time management. A pre- posttest prefaces a review of basic concepts of quality circles with reference to the work of Abraham Maslow,…

  15. The Japanese Quality Control Circle: Why It Works.

    Science.gov (United States)

    Watanabe, Susumu

    1991-01-01

    The competitiveness of Japanese industry is in part because of their quality circles. Despite the West's interest in most Japanese business practices, quality circles have been difficult to transplant. This may be a result of misconceptions about their nature and the erroneous idea that workers' motivation is sociocultural, whereas in fact it is…

  16. Growing a Circle of Courage Culture: One School's Journey

    Science.gov (United States)

    Espiner, Deborah; Guild, Diane

    2010-01-01

    Mt. Richmond Special School is the first Circle of Courage school in New Zealand. The school reflects the richness of the cultural and learning diversity found in many New Zealand schools. Located in the heart of South Auckland, the school's 130 students represent a wide range of ethnic backgrounds. The universal values in the Circle of Courage…

  17. Families and the Circle of Courage[TM

    Science.gov (United States)

    Garfat, Thom; Van Bockern, Steve

    2010-01-01

    The Circle of Courage philosophy encourages thoughts about the importance of courage in the lives of children and young people--the courage to face what life offers and the resilience to handle life's challenges. Belonging, mastery, independence, and generosity, the four areas identified by the Circle of Courage, are pathways to help young people…

  18. Quality Circles in Higher Education: Quality, Satisfaction, and Climate.

    Science.gov (United States)

    Kay, Carol; Healy, Margaret

    The effect of quality circles at Iowa State University on absenteeism, performance evaluation, perceptions of the organization climate, job satisfaction, and perceived opportunities for professional and personal growth was measured in this study. The process of quality circles is designed to promote job fulfillment and organizational productivity…

  19. Study Circles and the Dialogue to Change Program

    Science.gov (United States)

    Brennan, Mary; Brophy, Mark

    2010-01-01

    The origins of study circles can be traced back to the Chautauqua movement in the USA in the late nineteenth century. However, interest diminished in the USA and the Swedes discovered and enthusiastically imported the study circle idea as a remedy to their problems of poverty and illiteracy and to educate the broadest possible spectrum of society…

  20. From grazing marks to collapsed cliffs - intertidal bioerosion on all scales

    Science.gov (United States)

    Kázmér, Miklós; Taboroši, Danko; Hsieh, Meng-Long; Shafeea Leman, Mohd; Aziz Ali, Che; Roslan Mohamed, Kamal; Choowong, Montri

    2014-05-01

    Rocky shores - particularly in limestone areas of tropical, subtropical, and some temperate regions - are subject to intense bioerosion. Detailed field studies along the Gulf of Siam and the Andaman coast of Thailand, Langkawi Islands of Malaysia, southern Java and Bali in Indonesia, Palau Islands, and Okinawa revealed the presence of rich populations of bioeroding organisms in the intertidal zone. Molluscs capable of damaging rock (the chiton Acanthopleura, limpets, and whelks) leave grazing traces as they feed on bacterial and algal biofilms and chasmolithic and endolithic microorganisms. Boring sponges (Entobia), bivalves (Gastrochaenolites and others), boring sipunculid worms (Caulostrepsis), and sea urchins (Echinometra) drill deeper to hide from predators beneath the rock surface. Individually, members of these taxa leave marks ranging from sub-millimetre to the metre scale, but collectively, their erosion creates marine notches, several-metres-deep features extending between low and high tide marks. When cliffs overhanging these notches collapse, landscape-scale scars are left behind. The various bioeroders display a clear vertical zonation between low and high tide. These are dictated by environmental stress, food availability, competition, and predation. Typical inhabitants of present-day zones include - from top to bottom - littorinid snails, patellid limpets, chitons, boring bivalves, and boring sea urchins. Each organism leaves a characteristic mark in the bedrock. Trace fossils found in the 'wrong place' - either too high or too low compared to the present-day occurrence of the animals - suggest changes in relative sea level. Similarly, sea level changes are suggested by the presence of compound markings produced through overprinting by organisms that live in different ecological zones. Preservation and obliteration of traces depends on the rates of sea level change and coastal denudation. Morphology of bioerosional markings and their vertical zonation

  1. Effects of Long-Term Trampling on the Above-Ground Forest Vegetation and Soil Seed Bank at the Base of Limestone Cliffs

    Science.gov (United States)

    Rusterholz, Hans-Peter; Verhoustraeten, Christine; Baur, Bruno

    2011-11-01

    Exposed limestone cliffs in central Europe harbor a highly divers flora with many rare and endangered species. During the past few decades, there has been increasing recreational use of these cliffs, which has caused local environmental disturbances. Successful restoration strategies hinge on identifying critical limitations. We examined the composition of aboveground forest vegetation and density and species composition of seeds in the soil seed bank at the base of four limestone cliffs in mixed deciduous forests that are intensively disturbed by human trampling and at four undisturbed cliffs in the Jura Mountains in northwestern Switzerland. We found that long-term human trampling reduced total aboveground vegetation cover at the base of cliffs and caused a significant shift in the plant-species composition. Compared with undisturbed cliffs, total seed density was lower in disturbed cliffs. Human trampling also altered the species composition of seeds in the soil seed bank. Seeds of unintentionally introduced, stress-tolerant, and ruderal species dominated the soil seed bank at the base of disturbed cliffs. Our findings indicate that a restoration of degraded cliff bases from the existing soil seed bank would result in a substantial change of the original unique plant composition. Active seed transfer, or seed flux from adjacent undisturbed forest areas, is essential for restoration success.

  2. Ethical dimension of circle Integrative Community Therapy on qualitative research.

    Science.gov (United States)

    Santos, Paula Renata Miranda Dos; Cerencovich, Elisangela; Araújo, Laura Filomena Santos de; Bellato, Roseney; Maruyama, Sonia Ayako Tao

    2014-12-01

    This study discusses ethical issues in research involving human beings and seeks to understand the relationship between qualitative research and the ethical care guidelines for Integrative Community Therapy (ICT) circles based on Resolution 466/12 of the National Health Council of the Ministry of Health of Brazil. This is documentary research, which analyzed Resolution 466/12 and ICT circles seeking to make a connection between the ethical guidelines contained in both. The analysis of the corpus was directed toward the construction of the following results: the person's perception, cultural diversity and community. It also brings in consideration of the influence of the ethical dimension of the ICT circles on qualitative research. We conclude that ICT circles are innovative in the sense of the diversity of participants and respect for cultural and social differences. Thus, ICT circles promote acquisition of quality information for social research as well as compliance with the ethical guidelines outlined in Resolution No. 466/12. PMID:25830749

  3. New phases of near-extremal branes on a circle

    International Nuclear Information System (INIS)

    We study the phases of near-extremal branes on a circle, by which we mean near-extremal branes of string theory and M-theory with a circle in their transverse space. We find a map that takes any static and neutral Kaluza-Klein black hole, i.e. any static and neutral black hole on Minkowski-space times a circle Md x S1, and map it to a corresponding solution for a near-extremal brane on a circle. The map is derived using first a combined boost and U-duality transformation on the Kaluza-Klein black hole, transforming it to a solution for a non-extremal brane on a circle. The resulting solution for a near-extremal brane on a circle is then obtained by taking a certain near-extremal limit. As a consequence of the map, we can transform the neutral non-uniform black string branch into a new non-uniform phase of near-extremal branes on a circle. Furthermore, we use recently obtained analytical results on small black holes in Minkowski-space times a circle to get new information about the localized phase of near-extremal branes on a circle. This gives in turn predictions for the thermal behavior of the non-gravitational theories dual to these near-extremal branes. In particular, we give predictions for the thermodynamics of supersymmetric Yang-Mills theories on a circle, and we find a new stable phase of (2,0) Little String Theory in the canonical ensemble for temperatures above its Hagedorn temperature. (author)

  4. Structural analysis of San Leo (RN, Italy) east and north cliffs using 3D point clouds

    Science.gov (United States)

    Spreafico, Margherita Cecilia; Bacenetti, Marco; Borgatti, Lisa; Cignetti, Martina; Giardino, Marco; Perotti, Luigi

    2013-04-01

    The town of San Leo, like many others in the historical region of Montefeltro (Northern Apennines, Italy), was built in medieval period on a calcarenite and sandstone slab, bordered by subvertical and overhanging cliffs up to 100 m high, for defense purposes. The slab and the underlying clayey substratum show widespread landslide phenomena: the first is tectonized and crossed by joints and faults, and it is affected by lateral spreading with associated rock falls, topples and tilting. Moreover, the underlying clayey substratum is involved in plastic movements, like earth flows and slides. The main cause of instability in the area, which brings about these movements, is the high deformability contrast between the plate and the underlying clays. The aim of our research is to set up a numerical model that can well describe the processes and take into account the different factors that influence the evolution of the movements. One of these factors is certainly the structural setting of the slab, characterized by several joints and faults; in order to better identify and detect the main joint sets affecting the study area a structural analysis was performed. Up to date, a series of scans of San Leo cliff taken in 2008 and 2011, with a Riegl Z420i were analyzed. Initially, we chose a test area, located in the east side of the cliff, in which analyses were performed using two different softwares: COLTOP 3D and Polyworks. We repeated the analysis using COLTOP for all the east wall and for a part of the north wall, including an area affected by a rock fall in 2006. In the test area we identified five sets with different dips and dip directions. The analysis of the east and north walls permitted to identify eight sets (seven plus the bedding) of discontinuities. We compared these results with previous ones from surveys taken by others authors in some areas and with some preliminary data from a traditional geological survey of the whole area. With traditional methods only a

  5. Combined rock slope stability and shallow landslide susceptibility assessment of the Jasmund cliff area (Rügen Island, Germany

    Directory of Open Access Journals (Sweden)

    A. Günther

    2009-05-01

    Full Text Available In this contribution we evaluated both the structurally-controlled failure susceptibility of the fractured Cretaceous chalk rocks and the topographically-controlled shallow landslide susceptibility of the overlying glacial sediments for the Jasmund cliff area on Rügen Island, Germany. We employed a combined methodology involving spatially distributed kinematical rock slope failure testing with tectonic fabric data, and both physically- and inventory-based shallow landslide susceptibility analysis. The rock slope failure susceptibility model identifies areas of recent cliff collapses, confirming its value in predicting the locations of future failures. The model reveals that toppling is the most important failure type in the Cretaceous chalk rocks of the area. The shallow landslide susceptibility analysis involves a physically-based slope stability evaluation which utilizes material strength and hydraulic conductivity data, and a bivariate landslide susceptibility analysis exploiting landslide inventory data and thematic information on ground conditioning factors. Both models show reasonable success rates when evaluated with the available inventory data, and an attempt was made to combine the individual models to prepare a map displaying both terrain instability and landslide susceptibility. This combination highlights unstable cliff portions lacking discrete landslide areas as well as cliff sections highly affected by past landslide events. Through a spatial integration of the rock slope failure susceptibility model with the combined shallow landslide assessment we produced a comprehensive landslide susceptibility map for the Jasmund cliff area.

  6. Middle to late Pleistocene coastal deposits of Alghero, northwest Sardinia (Italy)

    DEFF Research Database (Denmark)

    Andreucci, S; Clemmensen, L; Murray, A.S.;

    2010-01-01

    subdivision of the succession in four unconformity-bounded units (U2, U3a, U3b, U4). Unit U2 of penultimate glacial stage (MIS 6; ca. 150 ka) is composed of dune deposits formed intermittently along rocky coastal areas under strong wind conditions. Subunit U3a is composed of cliff-bounded gravelly dominated...

  7. Sleep disturbances and PTSD: a perpetual circle?

    Directory of Open Access Journals (Sweden)

    Saskia van Liempt

    2012-10-01

    Full Text Available Background : Sleep facilitates the consolidation of fear extinction memory. Nightmares and insomnia are hallmark symptoms of posttraumatic stress disorder (PTSD, possibly interfering with fear extinction and compromising recovery. A perpetual circle may develop when sleep disturbances increase the risk for PTSD and vice versa. To date, therapeutic options for alleviating sleep disturbances in PTSD are limited. Methods : We conducted three studies to examine the relationship between sleep and posttraumatic symptoms: (1 a prospective longitudinal cohort study examining the impact of pre-deployment insomnia symptoms and nightmares on the development of PTSD; (2 a cross-sectional study examining subjective sleep measures, polysomnography, endocrinological parameters, and memory in veterans with PTSD, veterans without PTSD, and healthy controls (HCs; (3 a randomized controlled trial (RCT (n=14 comparing the effect of prazosin and placebo on sleep disturbances in veterans with PTSD. In addition to these studies, we systematically reviewed the literature on treatment options for sleep disturbances in PTSD. Results : Pre-deployment nightmares predicted PTSD symptoms at 6 months post-deployment; however, insomnia symptoms did not. Furthermore, in patients with PTSD, a correlation between the apnea index and PTSD severity was observed, while obstructive sleep apnea syndrome was not more prevalent. We observed a significant increase in awakenings during sleep in patients with PTSD, which were positively correlated with adrenocorticotropic hormone (ACTH levels, negatively correlated with growth hormone (GH secretion, and the subjective perception of sleep depth. Also, heart rate was significantly increased in PTSD patients. Interestingly, plasma levels of GH during the night were decreased in PTSD. Furthermore, GH secretion and awakenings were independent predictors for delayed recall, which was lower in PTSD. In our RCT, prazosin was not associated with

  8. Film Review: Red cliff%影评:《赤壁》

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    @@ 1 As the first film to re-create the 208 A.D. Battle of Chibi, themost famous military feat in Chinese history, John Woo's "RedCliff" is a Pan-Asian project with the word "monumental" written allover it. The 140-minute first half that opened across major Asianterritories is only a prelude that provides the beams and columns forthe narrative framework, but with a few decisive and spot-on actionspectacles, it sufficiently kindles expectations for the climactic clash inupcoming Part 2.

  9. Radiological survey results at 12 Cliff Street, Beverly, Massachusetts (VB010)

    International Nuclear Information System (INIS)

    At the request of the US Department of Energy (DOE), a team from Oak Ridge National Laboratory conducted a radiological survey at 12 Cliff Street, Beverly, Massachusetts. The survey was performed in May 1991. The purpose of the survey was to determine if uranium dust from work performed under government contract at the former Ventron facility had migrated off-site to neighboring areas. The survey included a surface gamma scan and the collection of soil samples for radionuclide analyses. Results of the survey demonstrated no radionuclide concentrations or radiation measurements in excess of the DOE Formerly Utilized Sites Remedial Action Program guidelines

  10. Radiological survey results at 13 Cliff Street, Beverly, Massachusetts (VB015)

    International Nuclear Information System (INIS)

    At the request of the US Department of Energy (DOE), a team from Oak Ridge National Laboratory conducted a radiological survey at 13 Cliff Street, Beverly, Massachusetts. The survey was performed in May 1991. The purpose of the survey was to determine if uranium from work performed under government contract at the former Ventron facility had migrated off-site to neighboring areas. The survey included a surface gamma scan, a beta-gamma scan of paved areas, and the collection of soil samples for radionuclide analyses. Results of the survey demonstrated no radionuclide concentrations or radiation measurements in excess of the DOE Formerly Utilized Sites Remedial Action Program guidelines

  11. Radiological survey results at 14 Cliff Street, Beverly, Massachusetts (VB011)

    International Nuclear Information System (INIS)

    At the request of the US Department of Energy (DOE), a team from Oak Ridge National Laboratory conducted a radiological survey at 14 Cliff Street, Beverly, Massachusetts. The survey was performed in May 1991. The purpose of the survey was to determine if uranium dust from work performed under government contract at the former Ventron facility had migrated off-site to neighboring areas. The survey included a surface gamma scan and the collection of soil samples for radionuclide analyses. Results of the survey demonstrated no radionuclide concentrations or radiation measurements in excess of the DOE Formerly Utilized Sites Remedial Action Program guidelines

  12. Radiological survey results at 20 Cliff Street, Beverly, Massachusetts (VB013)

    International Nuclear Information System (INIS)

    At the request of the US Department of Energy (DOE), a team from Oak Ridge National Laboratory conducted a radiological survey at 20 Cliff Street, Beverly, Massachusetts. The survey was performed in May 1991. The purpose of the survey was to determine if uranium dust from work performed under government contract at the former Ventron facility had migrated off-site to neighboring areas. The survey included a surface gamma scan and the collection of soil samples for radionuclide analyses. Results of the survey demonstrated no radionuclide concentrations or radiation measurements in excess of the DOE Formerly Utilized Sites Remedial Action Program guidelines

  13. Radiological survey results at 2 Cliff Street, Beverly, Massachusetts (VB007)

    International Nuclear Information System (INIS)

    At the request of the US Department of Energy (DOE), a team from Oak Ridge National Laboratory conducted a radiological survey at 2 Cliff Street, Beverly, Massachusetts. The survey was performed in May 1991. The purpose of the survey was to determine if uranium dust from work performed under government contract at the former Ventron facility had migrated off-site to neighboring areas. The survey included a surface gamma scan and the collection of soil samples for radionuclide analyses. Results of the survey demonstrated no radionuclide concentrations or radiation measurements in excess of the DOE Formerly Utilized Sites Remedial Action Program guidelines

  14. Radiological survey results at 10 Cliff Street, Beverly, Massachusetts (VB021)

    International Nuclear Information System (INIS)

    At the request of the US Department of Energy (DOE), a team from Oak Ridge National Laboratory conducted a radiological survey at 10 Cliff Street, Beverly, Massachusetts. The survey was performed in May 1991. The purpose of the survey was to determine if uranium from work performed under government contract at the former Ventron facility had migrated off-site to neighboring areas. The survey included a surface gamma scan, a beta-gamma scan of paved areas, and the collection of soil samples for radionuclide analyses.Results of the survey demonstrated no radionuclide concentrations or radiation measurements in excess of the DOE Formerly Utilized Sites Remedial Action Program guidelines

  15. Radiological survey results at 18 Cliff Street, Beverly, Massachusetts (VB012)

    International Nuclear Information System (INIS)

    At the request of the US Department of Energy (DOE), a team from Oak Ridge National Laboratory conducted a radiological survey at 18 Cliff Street, Beverly, Massachusetts. The survey was performed in May 1991. The purpose of the survey was to determine if uranium dust from work performed under government contract at the former Ventron facility had migrated off-site to neighboring areas. The survey included a surface gamma scan and the collection of soil samples for radionuclide analyses. Results of the survey demonstrated no radionuclide concentrations or radiation measurements in excess of the DOE mannerly Utilized Sites Remedial Action Program guidelines

  16. Radiological survey results at 9 Cliff Street, Beverly, Massachusetts (VB017)

    International Nuclear Information System (INIS)

    At the request of the US Department of Energy (DOE), a team from Oak Ridge National Laboratory conducted a radiological survey at 9 Cliff Street, Beverly, Massachusetts. The survey was performed in May 1991. The purpose of the survey was to determine if uranium from work performed under government contract at the former Ventron facility had migrated off-site to neighboring areas. The survey included a surface gamma scan and the collection of soil samples for radionuclide analyses. Results of the survey demonstrated no radionuclide concentrations or radiation measurements in excess of the DOE Formerly Utilized Sites Remedial Action Program guidelines

  17. Radiological survey results at 15 Cliff Street, Beverly, Massachusetts (VB014)

    International Nuclear Information System (INIS)

    At the request of the US Department of Energy (DOE), a team from Oak Ridge National Laboratory conducted a radiological survey at 15 Cliff Street, Beverly, Massachusetts. The survey was performed in May 1991. The purpose of the survey was to determine if uranium dust from work performed under government contract at the former Ventron facility had migrated off-site to neighboring areas. The survey included a surface gamma scan and the collection of soil samples for radionuclide analyses. Results of the survey demonstrated no radionuclide concentrations or radiation measurements in excess of the DOE Formerly Utilized Sites Remedial Action Program guidelines

  18. Brief communication"Estimating rockfall frequency in a mountain limestone cliff using terrestrial laser scanner"

    Directory of Open Access Journals (Sweden)

    A. Guerin

    2014-01-01

    Full Text Available Using terrestrial laser scanner, 344 rockfalls larger than 0.05 m3 have been detected for a period of 1180 days, in a thinly bedded limestone cliff of width 750 m and height 200 m. The complementary cumulative distribution of the rockfall volume is well fitted by a power law, with an exponent b of 0.75 ± 0.04. In order to compare the rockfall frequencies in different geological contexts, a rockfall activity parameter has been defined, which is the number of rockfalls larger than 1 m3, which occur per century and per hm2.

  19. Inhomogeneous field theory inside the arctic circle

    Science.gov (United States)

    Allegra, Nicolas; Dubail, Jérôme; Stéphan, Jean-Marie; Viti, Jacopo

    2016-05-01

    Motivated by quantum quenches in spin chains, a one-dimensional toy-model of fermionic particles evolving in imaginary-time from a domain-wall initial state is solved. The main interest of this toy-model is that it exhibits the arctic circle phenomenon, namely a spatial phase separation between a critically fluctuating region and a frozen region. Large-scale correlations inside the critical region are expressed in terms of correlators in a (euclidean) two-dimensional massless Dirac field theory. It is observed that this theory is inhomogenous: the metric is position-dependent, so it is in fact a Dirac theory in curved space. The technique used to solve the toy-model is then extended to deal with the transfer matrices of other models: dimers on the honeycomb and square lattice, and the six-vertex model at the free fermion point (Δ =0 ). In all cases, explicit expressions are given for the long-range correlations in the critical region, as well as for the underlying Dirac action. Although the setup developed here is heavily based on fermionic observables, the results can be translated into the language of height configurations and of the gaussian free field, via bosonization. Correlations close to the phase boundary and the generic appearance of Airy processes in all these models are also briefly revisited in the appendix.

  20. Geršgorin and his circles

    CERN Document Server

    Varga, Richard S

    2004-01-01

    TheGer? sgorin CircleTheorem, averywell-known resultin linear algebra today, stems from the paper of S. Ger? sgorin in 1931 (which is reproduced in AppendixD)where,givenanarbitraryn×ncomplexmatrix,easyarithmetic operationsontheentriesofthematrixproducendisks,inthecomplexplane, whose union contains all eigenvalues of the given matrix. The beauty and simplicity of Ger? sgorin’s Theorem has undoubtedly inspired further research in this area, resulting in hundreds of papers in which the name “Ger? sgorin” appears. The goal of this book is to give a careful and up-to-date treatment of various aspects of this topic. The author ?rst learned of Ger? sgorin’s results from friendly conversations with Olga Taussky-Todd and John Todd, which inspired me to work in this area.Olgawasclearlypassionateaboutlinearalgebraandmatrixtheory,and her path-?nding results in these areas were like a magnet to many, including this author! It is the author’s hope that the results, presented here on topics related to Ger? sgorin...

  1. Rotation Intervals for Quasi-Periodically Forced Circle Maps

    OpenAIRE

    Silvia Pina-Romero

    2012-01-01

    This work investigates some aspects of the dynamics of non-invertible quasi-periodic circle maps, from the point of view of rotation numbers and their structure in parameter space.Circle maps and quasi-periodically forced circle maps have been widely used asa model for a broad range of physical phenomena. From the mathematical point of view they have also received considerable attention because of the many interesting features they exhibit.The system used is given by the maps: x_n = [ x_n-1 +...

  2. Yang-Lee Circle Theorem for an Antiferromagnetic Heisenberg Ladder

    Institute of Scientific and Technical Information of China (English)

    王先智

    2001-01-01

    The Yang-Lee zeros of an antiferromagnetic Heisenberg ladder model are determined. It is found that if J4≤0 Yang-Lee zeros are located on the unit circle and on the negative real axis in the complex activity plane. In particular, if J4≤0 and 2J2≥J4, Yang-Lee zeros are located on the unit circle and the Yang-Lee circle theorem is valid. If J4 > 0, Yang-Lee zeros are located on some complicated curves.

  3. Design and Calculation of the Resistance Circles for Wooden Barrels

    Directory of Open Access Journals (Sweden)

    Adriana FOTIN

    2011-03-01

    Full Text Available The aim of this paper is to present a design methodology for the circles of wooden barrels, usingappropriate strength calculations, so as to provide tightness while maintaining the integrity of the woodenmaterial embedded in the barrel structure, in the jacket and bottom staves, respectively.Based on these calculations, the circle dimensions (length, width and thickness can be defined,depending on the barrel type (for transport or storage and their relation to the barrel bottoms.Defining the dimensional characteristics of the circles is mandatory, as these are safety elements in thebarrel operation.

  4. Processes and rate of retreat of the clay and sandstone sea cliffs of the northern Boulonnais (France)

    Science.gov (United States)

    Pierre, Guillaume

    2006-01-01

    Retreat of the clay and sandstone cliffs of the northern Boulonnais (France) has been quantified using stereophotogrammetry. The low retreat rate of this coastal strip — 0.08 m/yr between 1939 and 2003 — is far less than that encountered on chalk and clay-chalk cliffs of either side of the Channel, and even less than a previous estimate of 0.17 m/yr regularly quoted in management studies. The retreat rate is closely related to shore platform morphology and dynamics. The shore platform presents 1) a steeply sloping ramp due to the accumulation of flat calcareous megaclasts that reduce marine erosion; 2) upstanding bare platform surfaces, related to tectonic deformation; and 3) thick platform-beaches trapped in troughs. In all three cases, the reflective behaviour of the nearshore protects the cliff foot from the incoming waves. Two critical eroding segments are the result of changes in the platform sedimentary budget. Around Cran Poulet, and between Plage de la Sirène and Pointe de la Courte Dune, the retreat rate is up to 0.25 and 0.15 m/yr, respectively. At Cran Poulet, recession has been facilitated by the extraction of pebble for more than half a century, whereas erosion of the beach at la Sirène is probably linked to severe erosion of the coastline in the adjacent Wissant Bay. Mass movements on the cliff face are essentially shallow-seated translational slides along with small debris falls and mudflows. The instability of the Argiles de Châtillon is greatly diminished by their sandy and silty texture and by the presence of interstratified solid shelly limestone beds that allow steep slopes to develop in rather weak material. The 'vertical erosion antecedent' is the erosional mode of the cliff, and its reduced efficiency explains the slow recession of the cliff. This study will help to determine the long term evolution of the Boulonnais coast.

  5. Construction of accurate geological cross-sections along trenches, cliffs and mountain slopes using photogrammetry

    Science.gov (United States)

    Martín, Santiago; Uzkeda, Hodei; Poblet, Josep; Bulnes, Mayte; Rubio, Ramón

    2013-02-01

    This paper discusses the application of close range photogrammetry for the construction of geological cross-sections from outcrops located on trenches, cliffs and mountain slopes. Our methodology is based on stereoscopic pairs of photographs of the outcrops on which geological interpretations may be carried out directly using a digital stereo viewer. It is also possible to automatically obtain point clouds. Through control points of known coordinates taken on the field and located in the photographs, the three-dimensional model recovered is correctly geo-referenced and the residual error is minimized. Layers and tectonic structures recognized in the photographs can be easily projected in any desired direction, as, for example, in the direction of the fold axes to obtain a proper view of the geometry of the structures, or in one direction parallel to the tectonic transport vector if a restoration is demanded. The application of this methodology is shown by constructing a detailed geological cross-section at the cliffs of La Conejera Inlet (Asturias, Spain). The studied structures, involving Jurassic rocks, are located in a Permian-Mesozoic extensional basin called Asturian Basin (NW Iberian Peninsula). This basin was partially formed during the opening of the Bay of Biscay and partially inverted during a Cenozoic contraction responsible for the Pyrenees and its western prolongation along the north margin of the Iberian Peninsula.

  6. Vascular Plant and Vertebrate Inventory of Gila Cliff Dwellings National Monument

    Science.gov (United States)

    Powell, Brian F.; Albrecht, Eric W.; Halvorson, William L.; Schmidt, Cecilia A.; Docherty, Kathleen; Anning, Pamela

    2006-01-01

    Executive Summary This report summarizes the results of the first comprehensive biological inventory of Gila Cliff Dwellings National Monument (NM) in western New Mexico. This project was part of a larger effort to inventory plants and vertebrates in eight National Park Service units in Arizona and New Mexico. Our surveys address many of the objectives that were set forth in the monument's natural resource management plan almost 20 years ago, but until this effort, those goals were never accomplished. From 2001 to 2003 we surveyed for vascular plants and vertebrates (amphibians, reptiles, birds, and mammals) at Gila Cliff Dwellings NM to document presence of species within the boundaries of the monument. For all taxonomic groups that we studied, we collected 'incidental' sightings on U.S. Forest Service lands adjacent to the monument, and in a few cases we did formal surveys on those lands. Because we used repeatable study designs and standardized field techniques, these inventories can serve as the first step in a biological monitoring program for Gila Cliff Dwellings NM and surrounding lands. We recorded 552 species at Gila Cliff Dwellings NM and the surrounding lands (Table 1). We found no non-native species of reptiles, birds, or mammals, one non-native amphibian (American bullfrog), and 33 non-native plants. Particularly on lands adjacent to the monument we found that the American bullfrog was very abundant, which is a cause for significant management concern. Species of non-native plants that are of management concern include red brome, bufflegrass, and cheatgrass. For a park unit of its size and geographic location, we found the plant and vertebrate communities to be fairly diverse; for each taxonomic group we found representative species from a wide range of taxonomic orders and/or families. The monument's geographic location, with influences from the Rocky Mountain, Chihuahuan Desert, and Madrean ecological provinces, plays an important role in determining

  7. Bounded Gain of Energy on the Breathing Circle Billiard

    OpenAIRE

    Kamphorst, Sylvie Oliffson; de Carvalho, Sonia Pinto

    1998-01-01

    The Breathing Circle is a 2-dimensional generalization of the Fermi Accelerator. It is shown that the billiard map associated to this model has invariant curves in phase space, implying that any particle will have bounded gain of energy.

  8. Simulation of Induction Motor Characteristics Using a Circle Diagram

    OpenAIRE

    Mesņajevs, A; Ketnere, E; Meišele, A

    2010-01-01

    The circle diagram helps to identify all electromagnetic values, which describe the machin`s opeation mode at different slip values and gives them a better description when machine`s operating mode is changing.

  9. Piecewise-smooth circle homeomorphisms with several break points

    International Nuclear Information System (INIS)

    We prove that the invariant probability measure of an ergodic piecewise-smooth circle homeomorphism with several break points and the product of the jumps at break points non-trivial is singular with respect to Lebesgue measure.

  10. Circle of Life——Symbolism in The Winter's Tale

    Institute of Scientific and Technical Information of China (English)

    李潇雨

    2007-01-01

    This essay tries to illustrate Winter's Tale's symbolic meaning about human life.It draws conclusion that Shakespeare's plan is to combine the natural rule of seasonal cycle with the life circle of human world.

  11. Parhelic-like circle from light scattering in Plateau borders

    Energy Technology Data Exchange (ETDEWEB)

    Tufaile, A., E-mail: tufaile@usp.br; Tufaile, A.P.B.

    2015-03-06

    We are reporting a new simple optical element to generate halos. We have observed interesting patterns of light scattering in Plateau borders in foams. In analogy to the atmospheric phenomena known as parhelic circle, sun dogs, and sun pillars, we have named the features of the patterns observed as parlaseric circle, laser dogs, and laser pillars. The triangular symmetry of the Plateau borders is analogous to the hexagonal symmetry of ice crystals which produce these atmospheric phenomena. Working with one Plateau border at a time, we have observed wave optics phenomena that are not perceived in the atmospheric phenomena, such as diffraction and interference. - Highlights: • We obtained halo formation from light scattering in a Plateau border using an experiment. • We explained halo formation using geometrical theory of diffraction. • An optical element based on a Plateau border is proposed. • We compared some aspects of the parhelic circle with the parlaseric circle.

  12. Optimal impulsive ellipse-to-circle coplanar rendezvous

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    The problem of ellipse-to-circle coplanar rendezvous with chaser spacecraft in low eccentricity was investigated in this paper.With reference frame established in the centroid of the target spacecraft,the process of ellipse-to-circle coplanar rendezvous was described by the relative equations based on cy-lindrical reference frame,and then the solutions and distributions of optimal rendezvous models of a kind of close ellipse-to-circle coplanar rendezvous were provided.The simulation results showed that the guidance law based on the optimal rendezvous model in this research has good performance,and that the distributions of optimal rendezvous models of ellipse-to-circle coplanar rendezvous with the chaser spacecraft in low eccentricity are similar,albeit with slight difference,to those of rendezvous between close circular orbits.The work in this paper is a useful extension to Prussing’s optimal ren-dezvous theory between close circular orbits.

  13. The virtuous circle and the vicious circle in managerial training investment

    Directory of Open Access Journals (Sweden)

    Cristina Călugăru

    2015-05-01

    Full Text Available In parallel with the consolidation of the view that there is a real need to train and improve enterprises’ managerial staff – also in parallel with the increase of expenses incurred by enterprises in this direction, in the past decades this investment in managerial training is rather preparatory for the subsequent professional evolution of the people appointed in management positions of said enterprises – direct beneficiaries of these training or improvement programs. Thus, there appears a gap between what enterprises wish to obtain, by implementing such training and development programs, and what they are actually obtaining: in fact, the investment ‘leaks’ from the virtuous circle1 of acquisition of higher managerial competences and of their application in said enterprises (to obtain better economic performances, in activities that are more and more competitive, into the vicious circle of non-using this investment in management training, for many various reasons that we could identify using the results of empirical research.

  14. Minimal genus in 4-manifolds with a free circle action

    CERN Document Server

    Friedl, Stefan

    2012-01-01

    Let N be a closed irreducible 3-manifold such that its fundamental group is virtually RFRS. Using work of Ian Agol we will improve, for all but finitely many circle bundles M over N, the adjunction inequality for the minimal complexity of embedded surfaces. Appealing to a result of Dani Wise, this allows us to completely determine the minimal complexity of embedded surfaces in all but finitely many circle bundles over a large class of hyperbolic 3-manifolds.

  15. Culture Circles in adolescent empowerment for the prevention of violence

    OpenAIRE

    Monteiro, Estela Maria Leite Meirelles; Neto, Waldemar Brandão; Lima, Luciane Soares de; de Aquino, Jael Maria; Gontijo, Daniela Tavares; Pereira, Beatriz Oliveira

    2015-01-01

    An action research based on Paulo Freire's Culture Circles was developed to implement a health education intervention involving adolescents, in collective knowledge construction about strategies for the prevention of violence. The data collection in the Culture Circles involved 11 adolescents and included observation and field diary, photographic records and recording. The educational action aroused a critical socio-political and cultural position in the adolescents towards the situations of ...

  16. Literature Circles: An Effective Method to Develop Reading Habit

    OpenAIRE

    AVCI, Süleyman; Yüksel, Arzu; AKINCI, Tuncay

    2013-01-01

    The purpose of this study is to inform teachers -who want to develop reading habit in their students and to turn them into efficient readers- on theoretical basis of literature circles method and its application within the classroom. A literature circles is a teaching method in which students select specific books to read, then are classified into discussion groups based on their selections, and finally discuss the parts of these books they individually in their discussion group. The literatu...

  17. Peacemaking Circles & Young Refugees: Building Resilience in Germany

    OpenAIRE

    Ammar, Mounira

    2014-01-01

    This work focuses on a particular form of culture-specific discrimination against refugee minors in Germany. Of central interest is the potential of peacemaking circles in the struggle for the transformation of community spirit in Germany and the restoration of justice for the persons concerned. In order to highlight the Circle's strive for inclusiveness the ideals and reformative philosophy of the peacemaking process will be introduced. The paper examines the theoretical framework of re...

  18. Ethical dimension of circle Integrative Community Therapy on qualitative research

    OpenAIRE

    Paula Renata Miranda dos Santos; Elisangela Cerencovich; Laura Filomena Santos Araújo; Roseney Bellato; Sonia Ayako Tao Maruyama

    2014-01-01

    This study discusses ethical issues in research involving human beings and seeks to understand the relationship between qualitative research and the ethical care guidelines for Integrative Community Therapy (ICT) circles based on Resolution 466/12 of the National Health Council of the Ministry of Health of Brazil. This is documentary research, which analyzed Resolution 466/12 and ICT circles seeking to make a connection between the ethical guidelines contained in both. The analysis of the cor...

  19. Empowering Children Through Circle Time: An Illumination of Practice

    OpenAIRE

    Collins, Bernie

    2011-01-01

    The focus of the research is circle time, a widely used method in Irish primary schools. It involves children sitting in a circle with their teacher using method-specific techniques and strategies to promote self-esteem, develop skills and support positive classroom relationships. The theoretical and conceptual framework adopted has empowerment of children as its central focus, and is supported by theories of self-esteem, emotional intelligence, and voice and participation theory. Learning an...

  20. Analysis of sea cliff slope stability integrating traditional geomechanical surveys and remote sensing

    Directory of Open Access Journals (Sweden)

    S. Martino

    2013-07-01

    Full Text Available An integrated approach to the geomechanical characterization of coastal sea cliffs was demonstrated at Mt. Pucci (Gargano promontory, Southern Italy by performing direct traditional geomechanical and remote geostructural investigations via Terrestrial Laser Scanner (TLS. The consistency of the integrated techniques allowed us to achieve a comprehensive and affordable characterization of the main joint sets on the sea cliff slope. The observed joint sets were observed to evaluate the susceptibility of the slope to rock falls by attributing safety factors (SFs to the topple- and wedge-prone rock blocks under three triggering conditions: (a filling with static water, (b seismic action, and (c weathering of joint surfaces. The results of the susceptibility analysis for the topple-prone blocks show that the critical height of water filling of the joint is up to 50 cm and that the critical pseudo-static acceleration values vary in the range of 0.16–0.3 g depending on the block geometry and slope face orientation. For the wedge blocks, the critical height of water filling of the joint is generally up to several centimeters, and the critical pseudo-static acceleration values vary in the range of 0.05–0.8 g depending on the block geometry and slope face orientation. Moreover, the unstable conditions of the blocks due to weathering generally represent 60% of the joint degradation of the intact rock. The combined action of weathering and static water fill was also considered, resulting in a significant decrease of the SFs. Specifically, unstable conditions are associated with water levels lower than 47% of the water levels observed in intact joints, even if less than 60% of the weathering is attributed to the joints. Furthermore, remote survey analyses via Thermal InfraRed Camera and Terrestrial SAR Interferometry (TInSAR were performed to evaluate the role of the surveyed joint sets in inducing instabilities in the Mt. Pucci sea cliff. The results of

  1. Think Crisis-Think Female : The Glass Cliff and Contextual Variation in the Think Manager-Think Male Stereotype

    NARCIS (Netherlands)

    Ryan, Michelle K.; Haslam, S. Alexander; Hersby, Mette D.; Bongiorno, Renata

    2011-01-01

    The "think manager think male" (TMTM) association underlies many gender inequalities in the workplace. However, research into the "glass cliff" has demonstrated that the suitability of male and female managers varies as a function of company performance such that in times of poor performance people

  2. Thermal Modeling of NUHOMS HSM-15 and HSM-1 Storage Modules at Calvert Cliffs Nuclear Power Station ISFSI

    Energy Technology Data Exchange (ETDEWEB)

    Suffield, Sarah R.; Fort, James A.; Adkins, Harold E.; Cuta, Judith M.; Collins, Brian A.; Siciliano, Edward R.

    2012-10-01

    As part of the Used Fuel Disposition Campaign of the Department of Energy (DOE), visual inspections and temperature measurements were performed on two storage modules in the Calvert Cliffs Nuclear Power Station’s Independent Spent Fuel Storage Installation (ISFSI). Detailed thermal models models were developed to obtain realistic temperature predictions for actual storage systems, in contrast to conservative and bounding design basis calculations.

  3. Reactions to the glass cliff - Gender differences in the explanations for the precariousness of women's leadership positions

    NARCIS (Netherlands)

    Ryan, M.K; Haslam, S.A.; Postmes, T.

    2007-01-01

    Purpose - This paper aims to investigate the phenomenon of the glass cliff, whereby women are more likely than men to be placed in precarious leadership positions. Men's and women's reactions to this subtle form of gender discrimination are examined, the identity processes involved, and the implicat

  4. Structural interpretation of activity cliffs revealed by systematic analysis of structure-activity relationships in analog series.

    Science.gov (United States)

    Sisay, Mihiret T; Peltason, Lisa; Bajorath, Jürgen

    2009-10-01

    Discontinuity in structure-activity relationships (SARs) is caused by so-called activity cliffs and represents one of the major caveats in SAR modeling and lead optimization. At activity cliffs, small structural modifications of compounds lead to substantial differences in potency that are essentially unpredictable using quantitative structure-activity relationship (QSAR) methods. In order to better understand SAR discontinuity at the molecular level of detail, we have analyzed different compound series in combinatorial analog graphs and determined substitution patterns that introduce activity cliffs of varying magnitude. So identified SAR determinants were then analyzed on the basis of complex crystal structures to enable a structural interpretation of SAR discontinuity and underlying activity cliffs. In some instances, SAR discontinuity detected within analog series could be well rationalized on the basis of structural data, whereas in others a structural explanation was not possible. This reflects the intrinsic complexity of small molecule SARs and suggests that the analysis of short-range receptor-ligand interactions seen in X-ray structures is insufficient to comprehensively account for SAR discontinuity. However, in other cases, SAR information extracted from ligands was incomplete but could be deduced taking X-ray data into account. Thus, taken together, these findings illustrate the complementarity of ligand-based SAR analysis and structural information. PMID:19761254

  5. 77 FR 1748 - Atomic Safety and Licensing Board; Calvert Cliffs 3 Nuclear Project, LLC, and UniStar Nuclear...

    Science.gov (United States)

    2012-01-11

    ... Information and Resource Services, Beyond Nuclear, Public Citizen Energy Program, and Southern Maryland Citizens Alliance for Renewable Energy Solutions; (2) UniStar Nuclear Operating Services, LLC and Calvert... be located adjacent to the existing Calvert Cliffs Nuclear Power Plant (CCNPP), Units 1 and 2,...

  6. 76 FR 81994 - UniStar Nuclear Energy; Combined License Application for Calvert Cliffs Nuclear Power Plant, Unit...

    Science.gov (United States)

    2011-12-29

    ... COMMISSION UniStar Nuclear Energy; Combined License Application for Calvert Cliffs Nuclear Power Plant, Unit 3; Exemption 1.0 Background: UniStar Nuclear Energy (UNE) submitted to the U.S. Nuclear Regulatory... in a violation of the Atomic Energy Act of 1954, as amended, or the NRC's regulations. Therefore,...

  7. Juha Manninen and Friedrich Stadtler (eds.), The Vienna Circle and the Nordic countries : networks and transformations of logical empiricism (Vienna: Vienna Circle Institute Yearbook vol.14, Springer, 2010)

    OpenAIRE

    Carlo Penco

    2013-01-01

    A discussion of The Vienna Circle and the Nordic Countries. Networks and Transformations of Logical Empiricism, edited by Juha Manninen and Friedrich Stadtler, Vienna Circle Institute Yearbook vol.14, Springer, 2010.

  8. Juha Manninen and Friedrich Stadtler (eds., The Vienna Circle and the Nordic Countries. Networks and Transformations of Logical Empiricism (Vienna: Vienna Circle Institute Yearbook vol.14, Springer, 2010

    Directory of Open Access Journals (Sweden)

    Carlo Penco

    2013-03-01

    Full Text Available A discussion of The Vienna Circle and the Nordic Countries. Networks and Transformations of Logical Empiricism, edited by Juha Manninen and Friedrich Stadtler, Vienna Circle Institute Yearbook vol.14, Springer, 2010.

  9. Cliff top habitats provide important alternative feeding resources for wading birds of conservation importance wintering on non-estuarine coasts

    Science.gov (United States)

    Furnell, Julie; Hull, Susan L.

    2014-02-01

    Rocky shores and beaches are important over-wintering areas for non-estuarine waders but have rarely been studied. We examined cliff top habitat use by 6 species of wader over 75 km of coast to assess their potential value as alternative feeding sites to rocky and sandy shores. Both the regional and local survey showed that waders occurred on golf courses and recreational grasslands in higher frequencies than expected but arable and pasture use was lower than expected. We also compared local wader densities on rocky and sandy shores, pastures, golf courses, caravan parks and recreational grasslands over two winters. Sanderling predominantly fed on the beach whereas Oystercatcher, Dunlin, Turnstone and Redshank numbers significantly increased on golf courses and recreational grasslands over the winter period, with pasture being rarely used. General linear models were used to relate environmental factors to the presence and absence of each species on the cliff top habitats. Redshank was the only species that showed a higher probability of occurrence on cliff top habitats at high tide whereas the probability of Turnstone, Oystercatcher and Redshank occurring increased as temperatures declined. Using core sampling, we determined that invertebrate richness and abundance was significantly higher on the recreational grasslands and golf courses than on the pasture or the beach. Our data demonstrated that cliff top habitats are important alternative feeding areas for over-wintering waders in areas where the intertidal is bounded by cliffs. Current management creates short sward, open field habitats with a diverse and abundant invertebrate food supply exploited by waders. Any alterations to the land use of these areas should be carefully considered by planning authorities in light of the fact that they support species that are of conservation concern.

  10. The natural thermoluminescence of meteorites. IV - Ordinary chondrites at the Lewis Cliff ice field

    Science.gov (United States)

    Benoit, Paul H.; Sears, Hazel; Sears, Derek W. G.

    1992-01-01

    Results of natural thermoluminescence (TL) measurements of 302 meteorites from the vicinity of the Lewis Cliff in the Beardmore region of Antarctica are presented in order to identify fragments of a single fall and to elucidate ice sheet movements and the mechanisms by which meteorite concentration occurs at this site. From the distribution of meteorites on the ice, the shape of the fields of 'paired' meteorites, and trends in the natural TL data, it is inferred that there is a western component to the movement of the ice at this location, as well as the previously supposed movement to the north. The western vector explains the concentration of meteorites along the western edge of the ice tongue. These new natural TL data identify several recent falls and several meteorites which probably had unusually small perihelia immediately prior to capture by the earth.

  11. Detection probability of gyrfalcons and other cliff-nesting raptors during aerial surveys in Alaska

    Science.gov (United States)

    Booms, Travis L.; Fuller, Mark R.; Schempf, Philip F.; McCaffery, Brian J.; Lindberg, Mark S.

    2011-01-01

    Assessing the status of Gyrfalcons (Falco rusticolus) and other cliffnesting raptors as the Arctic climate changes often requires aerial surveys of their breeding habitats. Because traditional, count-based surveys that do not adjust for differing detection probabilities can provide faulty inference about population status (Link and Sauer 1998, Thompson 2002), it will be important to incorporate measures of detection probability into survey methods whenever possible. To evaluate the feasibility of this, we conducted repeated aerial surveys for breeding cliff-nesting raptors on the Yukon Delta National Wildlife Refuge (YDNWR) in western Alaska to estimate detection probabilities of Gyrfalcons, Golden Eagles (Aquila chrysaetos), Rough-legged Hawks (Buteo lagopus), and also Common Ravens (Corvus corax). Using the program PRESENCE, we modeled detection histories of each species based on single species occupancy modeling following MacKenzie et al. (2002, 2006). We used different observers during four helicopter replicate surveys in the Kilbuck Mountains and five fixed-wing replicate surveys in the Ingakslugwat Hills (hereafter called Volcanoes) near Bethel, Alaska. We used the following terms and definitions throughout: Survey Site: site of a nest used previously by a raptor and marked with a GPS-obtained latitude and longitude accurate to within 20 m. All GPS locations were obtained in prior years from a helicopter hovering approximately 10?20 m from a nest. The site was considered occupied if a bird or an egg was detected within approximately 500 m of the nest and this area served as our sampling unit. When multiple historical nests were located on a single cliff, we used only one GPS location to locate the survey site. Detection probability (p): the probability of a species being detected at a site given the site is occupied. Occupancy (?): the probability that the species of interest is present at a site during the survey period. A site was considered occupied if the

  12. Pressurized thermal shock evaluation of the Calvert Cliffs Unit 1 Nuclear Power Plant

    International Nuclear Information System (INIS)

    An evaluation of the risk to the Calvert Cliffs Unit 1 nuclear power plant due to pressurized thermal shock (PTS) has been completed by Oak Ridge National Laboratory (ORNL) with the assistance of several other organizations. This evaluation was part of a Nuclear Regulatory Commission program designed to study the PTS risk to three nuclear plants, the other two plants being Oconee Unit 1 and H.B. Robinson Unit 2. The specific objectives of the program were to (1) provide a best estimate of the frequency of a through-the-wall crack in the pressure vessel at each of the three plants, together with the uncertainty in the estimated frequency and its sensitivity to the variables used in the evaluation; (2) determine the dominant overcooling sequences contributing to the estimated frequency and the associated failures in the plant systems or in operator actions; and (3) evaluate the effectiveness of potential corrective measures

  13. Radiological survey results at 30 Cliff Street, Beverly, Massachusetts (VB022)

    International Nuclear Information System (INIS)

    At the request of the US Department of Energy (DOE), a team from Oak Ridge National Laboratory conducted a radiological survey at 30 Cliff Street, Beverly, Massachusetts. The survey was performed in May 1991. The purpose of the survey was to determine if uranium from work performed under government contract at the former Ventron facility had migrated off-site to neighboring areas. The survey included a surface gamma scan, a beta-gamma scan of paved areas, and the collection of soil samples for radionuclide analyses. Results of the survey demonstrated no radionuclide concentrations or radiation measurements in excess of the DOE Formerly Utilized Sites Remedial Action Program guidelines. The radionuclide distributions were not significantly different from typical background levels in the Beverly, Massachusetts, area

  14. Pressurized thermal shock evaluation of the Calvert Cliffs Unit 1 Nuclear Power Plant

    Energy Technology Data Exchange (ETDEWEB)

    Abbott, L [ed.

    1985-09-01

    An evaluation of the risk to the Calvert Cliffs Unit 1 nuclear power plant due to pressurized thermal shock (PTS) has been completed by Oak Ridge National Laboratory (ORNL) with the assistance of several other organizations. This evaluation was part of a Nuclear Regulatory Commission program designed to study the PTS risk to three nuclear plants, the other two plants being Oconee Unit 1 and H.B. Robinson Unit 2. The specific objectives of the program were to (1) provide a best estimate of the frequency of a through-the-wall crack in the pressure vessel at each of the three plants, together with the uncertainty in the estimated frequency and its sensitivity to the variables used in the evaluation; (2) determine the dominant overcooling sequences contributing to the estimated frequency and the associated failures in the plant systems or in operator actions; and (3) evaluate the effectiveness of potential corrective measures.

  15. The potential of low-cost RPAS for multi-view reconstruction of rock cliffs

    Science.gov (United States)

    Ettore Guccione, Davide; Thoeni, Klaus; Santise, Marina; Giacomini, Anna; Roncella, Riccardo; Forlani, Gianfranco

    2016-04-01

    RPAS, also known as drones or UAVs, have been used in military applications for many years. Nevertheless, the technology has become accessible to everyone only in recent years (Westoby et al., 2012; Nex and Remondino, 2014). Electric multirotor helicopters or multicopters have become one of the most exciting developments and several off-the-shelf platforms (including camera) are now available. In particular, RPAS can provide 3D models of sub-vertical rock faces, which for instance are needed for rockfall hazard assessments along road cuts and very steep mountains. The current work investigates the potential of two low-cost off-the-shelf quadcopters equipped with digital cameras for multi-view reconstruction of sub-vertical rock cliffs. The two platforms used are a DJI Phantom 1 (P1) equipped with a Gopro Hero 3+ (12MP) and a DJI Phantom 3 Professional (P3). The latter comes with an integrated 12MP camera mounted on a 3-axis gimbal. Both platforms cost less than 1.500€ including camera. The study area is a small rock cliff near the Callaghan Campus of the University of Newcastle (Thoeni et al., 2014). The wall is partly smooth with some evident geological features such as non-persistent joints and sharp edges. Several flights were performed with both cameras set in time-lapse mode. Hence, images were taken automatically but the flights were performed manually since the investigated rock face is very irregular which required adjusting the yaw and roll for optimal coverage since the flights were performed very close to the cliff face. The digital images were processed with a commercial SfM software package. Thereby, several processing options and camera networks were investigated in order to define the most accurate configuration. Firstly, the difference between the use of coded ground control targets versus natural features was studied. Coded targets generally provide the best accuracy but they need to be placed on the surface which is not always possible as rock

  16. Circles of Support and personalization: Exploring the economic case.

    Science.gov (United States)

    Wistow, Gerald; Perkins, Margaret; Knapp, Martin; Bauer, Annette; Bonin, Eva-Maria

    2016-06-01

    Circles of Support aim to enable people with learning disabilities (and others) to live full lives as part of their communities. As part of a wider study of the economic case for community capacity building conducted from 2012 to 2014, we conducted a mixed methods study of five Circles in North West England. Members of these Circles were supporting adults with moderate to profound learning disabilities and provided accounts of success in enabling the core member to live more independent lives with improved social care outcomes within cost envelopes that appeared to be less than more traditional types of support. The Circles also reported success in harnessing community resources to promote social inclusion and improve well-being. This very small-scale study can only offer tentative evidence but does appear to justify more rigorous research into the potential of Circles to secure cost-effective means of providing support to people with learning disabilities than the alternative, which in most cases would have been a long-term residential care placement. PMID:27004913

  17. Ethical dimension of circle Integrative Community Therapy on qualitative research

    Directory of Open Access Journals (Sweden)

    Paula Renata Miranda dos Santos

    2014-12-01

    Full Text Available This study discusses ethical issues in research involving human beings and seeks to understand the relationship between qualitative research and the ethical care guidelines for Integrative Community Therapy (ICT circles based on Resolution 466/12 of the National Health Council of the Ministry of Health of Brazil. This is documentary research, which analyzed Resolution 466/12 and ICT circles seeking to make a connection between the ethical guidelines contained in both. The analysis of the corpus was directed toward the construction of the following results: the person's perception, cultural diversity and community. It also brings in consideration of the influence of the ethical dimension of the ICT circles on qualitative research. We conclude that ICT circles are innovative in the sense of the diversity of participants and respect for cultural and social differences. Thus, ICT circles promote acquisition of quality information for social research as well as compliance with the ethical guidelines outlined in Resolution No. 466/12.

  18. Three-charge black holes on a circle

    Energy Technology Data Exchange (ETDEWEB)

    Harmark, Troels [Niels Bohr Institute, Blegdamsvej 17, 2100 Copenhagen Oe (Denmark); Obers, Niels A. [Niels Bohr Institute, Blegdamsvej 17, 2100 Copenhagen Oe (Denmark); Roenne, Peter B. [Niels Bohr Institute, Blegdamsvej 17, 2100 Copenhagen Oe (Denmark); Kristjansson, Kristjan R. [Nordita, Blegdamsvej 17, 2100 Copenhagen Oe (Denmark)

    2007-01-15

    We study phases of five-dimensional three-charge black holes with a circle in their transverse space. In particular, when the black hole is localized on the circle we compute the corrections to the metric and corresponding thermodynamics in the limit of small mass. When taking the near-extremal limit, this gives the corrections to the finite entropy of the extremal three-charge black hole as a function of the energy above extremality. For the partial extremal limit with two charges sent to infinity and one finite we show that the first correction to the entropy is in agreement with the microscopic entropy by taking into account that the number of branes shift as a consequence of the interactions across the transverse circle. Beyond these analytical results, we also numerically obtain the entire phase of non- and near-extremal three- and two-charge black holes localized on a circle. More generally, we find in this paper a rich phase structure, including a new phase of three-charge black holes that are non-uniformly distributed on the circle. All these three-charge black hole phases are found via a map that relates them to the phases of five-dimensional neutral Kaluza-Klein black holes.

  19. Three-charge black holes on a circle

    International Nuclear Information System (INIS)

    We study phases of five-dimensional three-charge black holes with a circle in their transverse space. In particular, when the black hole is localized on the circle we compute the corrections to the metric and corresponding thermodynamics in the limit of small mass. When taking the near-extremal limit, this gives the corrections to the finite entropy of the extremal three-charge black hole as a function of the energy above extremality. For the partial extremal limit with two charges sent to infinity and one finite we show that the first correction to the entropy is in agreement with the microscopic entropy by taking into account that the number of branes shift as a consequence of the interactions across the transverse circle. Beyond these analytical results, we also numerically obtain the entire phase of non- and near-extremal three- and two-charge black holes localized on a circle. More generally, we find in this paper a rich phase structure, including a new phase of three-charge black holes that are non-uniformly distributed on the circle. All these three-charge black hole phases are found via a map that relates them to the phases of five-dimensional neutral Kaluza-Klein black holes

  20. A Personified Annealing Algorithm for Circles Packing Problem

    Institute of Scientific and Technical Information of China (English)

    ZHANGDe-Fu; LIXin

    2005-01-01

    Circles packing problem is an NP-hard problem and is difficult to solve. In this paper, a hybrid search strategy for circles packing problem is discussed. A way of generating new configuration is presented by simulating the moving of elastic objects, which can avoid the blindness of simulated annealing search and make iteration process converge fast. Inspired by the life experiences of people,an effective personified strategy to jump out of local minima is given. Based on the simulated annealing idea and personification strategy, an effective personified annealing algorithm for circles packing problem is developed. Numerical experiments on benchmark problem instances show that the proposed algorithm outperforms the best algorithm in the literature.

  1. Circles Disturbed The Interplay of Mathematics and Narrative

    CERN Document Server

    Doxiadis, Apostolos

    2012-01-01

    Circles Disturbed brings together important thinkers in mathematics, history, and philosophy to explore the relationship between mathematics and narrative. The book's title recalls the last words of the great Greek mathematician Archimedes before he was slain by a Roman soldier--"Don't disturb my circles"--words that seem to refer to two radically different concerns: that of the practical person living in the concrete world of reality, and that of the theoretician lost in a world of abstraction. Stories and theorems are, in a sense, the natural languages of these two worlds--stories represent

  2. A simple algorithm for computing the smallest enclosing circle

    DEFF Research Database (Denmark)

    Skyum, Sven

    1991-01-01

    Presented is a simple O(n log n) algorithm for computing the smallest enclosing circle of a convex polygon. It can be easily extended to algorithms that compute the farthest-and the closest-point Voronoi diagram of a convex polygon within the same time bound.......Presented is a simple O(n log n) algorithm for computing the smallest enclosing circle of a convex polygon. It can be easily extended to algorithms that compute the farthest-and the closest-point Voronoi diagram of a convex polygon within the same time bound....

  3. Bayreuth circle and the struggle for the new German faith

    Directory of Open Access Journals (Sweden)

    Molnar Aleksandar I.

    2006-01-01

    Full Text Available In the article the author is depicting Bayreuth Circle as a social group of radical right-wing German intellectuals, who were trying not only to propagate and disseminate nationalist and anti-Semite ideas of controversial composer and thinker Richard Wagner, but also to produce substantial changes into the social reality of Second German Reich and Weimar Republic as well. Author's intention is to stress the straight of the mixture of art (mainly music and ideology, which enabled the members of Bayreuth Circle to be extremely successful in their efforts to "regenerate" the "deceased" German nation and, prospectively, the whole world.

  4. An Approach for Self-Calibration by a Quartered Circle

    OpenAIRE

    Yue Zhao; Xiaodan Lv

    2013-01-01

    The camera calibration is a key step for converting a projective reconstruction into a metric one, which is equivalent to recovering the unknown intrinsic parameters with each image. A circle is a common geometric primitive for the camera self-calibration. To avoid the limit of circle center to the camera self-calibration in a planar template, a method how to solve out the vanishing line is proposed. Then using the property of vanishing line, the camera intrinsic parameters are figured out an...

  5. A Phase Transition for Circle Maps and Cherry Flows

    Science.gov (United States)

    Palmisano, Liviana

    2013-07-01

    We study C 2 weakly order preserving circle maps with a flat interval. The main result of the paper is about a sharp transition from degenerate geometry to bounded geometry depending on the degree of the singularities at the boundary of the flat interval. We prove that the non-wandering set has zero Hausdorff dimension in the case of degenerate geometry and it has Hausdorff dimension strictly greater than zero in the case of bounded geometry. Our results about circle maps allow to establish a sharp phase transition in the dynamics of Cherry flows.

  6. A Phase Transition for Circle Maps and Cherry Flows

    CERN Document Server

    Palmisano, Liviana

    2012-01-01

    We study $C^{2}$ weakly order preserving circle maps with a flat interval. The main result of the paper is about a sharp transition from degenerate geometry to bounded geometry depending on the degree of the singularities at the boundary of the flat interval. We prove that the non-wandering set has zero Hausdorff dimension in the case of degenerate geometry and it has Hausdorff dimension strictly greater than zero in the case of bounded geometry. Our results about circle maps allow to establish a sharp phase transition in the dynamics of Cherry flows.

  7. Computing circles and spheres of arithmitic least squares

    Science.gov (United States)

    Nievergelt, Yves

    1994-07-01

    A proof of the existence and uniqueness of L. Moura and R. Kitney's circle of least squares leads to estimates of the accuracy with which a computer can determine that circle. The result shows that the accuracy deteriorates as the correlation between the coordinates of the data points increases in magnitude. Yet a numerically more stable computation of eigenvectors yields the limiting straight line, which a further analysis reveals to be the line of total least squares. The same analysis also provides generalizations to fitting spheres in higher dimensions.

  8. Co-Constructing Knowledge through NGO-Driven Circle Work

    DEFF Research Database (Denmark)

    Agerbæk, Jonas

    This presentation revolves around the question of what degree of control, if any, the users participating in NGO-driven development programs may have over their own development. Based on a multi-sited ethnography of NGO organizing and communication that I conducted in the period of 2010 to 2015......, and with a special analytical focus on the facilitating role of frontline NGO workers in rural East Africa, this presentation discusses enabling and constraining aspects of using circle work to co-produce knowledge in international development. More particularly I am focusing an approach to circle...

  9. Dance in a circle – from prehistory to the kindergarten

    OpenAIRE

    Strežek, Staša

    2013-01-01

    In the graduate thesis I wanted to present dance in a circle through time and its significance and the importance of dance in a circle in pre-school. The theoretical part is divided into six parts. In the beginning, a few words about dance in general (what it is, how they define various authors). In the next part is presented a brief history of the dance, the dance of primitive peoples, what is involved, what used to be a dance was designed and how they are dancing. This is followed by t...

  10. Types of the cerebral arterial circle (circle of Willis in a Sri Lankan Population

    Directory of Open Access Journals (Sweden)

    Gunasekera WSL

    2011-01-01

    Full Text Available Abstract Background The variations of the circle of Willis (CW are clinically important as patients with effective collateral circulations have a lower risk of transient ischemic attack and stroke than those with ineffective collaterals. The aim of the present cadaveric study was to investigate the anatomical variations of the CW and to compare the frequency of prevalence of the different variations with previous autopsy studies as variations in the anatomy of the CW as a whole have not been studied in the Indian subcontinent. Methods The external diameter of all the arteries forming the CW in 225 normal Sri Lankan adult cadaver brains was measured using a calibrated grid to determine the prevalence in the variation in CW. Chisquared tests and a correspondence analysis were performed to compare the relative frequencies of prevalence of anatomical variations in the CW across 6 studies of diverse ethnic populations. Results We report 15 types of variations of CW out of 22 types previously described and one additional type: hypoplastic precommunicating part of the anterior cerebral arteries (A1 and contralateral posterior communicating arteries (PcoA 5(2%. Statistically significant differences (p Conclusion The present study reveals that there are significant variations in the CW among intra and inter ethnic groups (Caucasian, African and Asian: Iran and Sri Lanka dominant populations, and warrants further studies keeping the methods of measurements, data assessment, and the definitions of hypoplasia the same.

  11. CoSMoS (Coastal Storm Modeling System) Southern California v3.0 projections of coastal cliff retreat due to 21st century sea-level rise

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — Summary: This dataset contains projections of coastal cliff-retreat rates and positions for future scenarios of sea-level rise (SLR). Projections were made using...

  12. A review of fast circle and helix fitting

    CERN Document Server

    Frühwirth, R; Waltenberger, W; Wroldsen, J

    2003-01-01

    Circle and helix fitting is of paramount importance in the data analysis of LHC experiments. We review several approaches to exact but fast fitting, including a recent development based on the projection of the measured points onto a second-order surface in space (a sphere or a paraboloid). We present results of a comparison with global and recursive linearized least-squares estimators.

  13. Examining Circle of Security™: A Review of Research and Theory

    Science.gov (United States)

    Mercer, Jean

    2015-01-01

    The Circle of Security™ interventions are psychosocial treatments intended to increase maternal sensitivity and thus child attachment security in infants and young children. A small number of publications have reported empirical research on outcomes of these treatments. This article reviews the research evidence, plausibility, theoretical…

  14. Circle Time for Social and Emotional Learning in Primary School

    Science.gov (United States)

    Cefai, Carmel; Ferrario, Erika; Cavioni, Valeria; Carter, Audrey; Grech, Tracy

    2014-01-01

    This paper discusses the findings and implications of a semi-randomised control trial study on the effectiveness of circle time (CT) on primary school students' social and emotional learning, as well as classroom teachers' and students' experience of CT. A social and emotional learning programme was delivered through CT by trained…

  15. Elliptic open books on torus bundles over the circle

    OpenAIRE

    Etgü, Tolga

    2006-01-01

    As an application of the construction of open books on plumbed 3-manifolds, we construct elliptic open books on torus bundles over the circle. In certain cases these open books are compatible with Stein fillable contact structures and have minimal genus.

  16. An Approach for Self-Calibration by a Quartered Circle

    Directory of Open Access Journals (Sweden)

    Yue Zhao

    2013-07-01

    Full Text Available The camera calibration is a key step for converting a projective reconstruction into a metric one, which is equivalent to recovering the unknown intrinsic parameters with each image. A circle is a common geometric primitive for the camera self-calibration. To avoid the limit of circle center to the camera self-calibration in a planar template, a method how to solve out the vanishing line is proposed. Then using the property of vanishing line, the camera intrinsic parameters are figured out and the camera self-calibration is achieved. The template contains a quartered circle in the study. Firstly, the camera is used to take photographs of the template from three or more direction. Secondly, using the ellipse and two mutually perpendicular diameters which are extracted from the image, according to the polarity principle and making use of the invariant property of cross-ratio of four lines which are intersected in one same point, the vanishing line can be solved out. In the end, the circular points can be figured out by the intersection between vanishing line and the circle. And using the property of the circular points, the self-calibration is realized.

  17. Role of a circle's center in visual interpolation.

    Science.gov (United States)

    Huang, Liqiang; Vul, Edward

    2006-07-01

    Basic geometric patterns like straight lines and circles seem fundamental to human perception and mental imagery. In this study we examined subjects' ability to interpolate circular curves-to derive the whole circle from an arc of 180 degrees or less. Specifically, we tested how the center point is utilized during such visual interpolation. Naturally, a mechanism that interpolates by extending the curvature of the visible arc will be unaffected by the presence or absence of the center point. On the other hand, a mechanism that achieves the same end by completing the circle from estimates of the center and radius will be significantly aided by the presence of the center. We found that when the visible arc was long (180 degrees), presenting the circle's center did not affect the precision with which subjects localized the invisible section. However, when the visible arc was relatively short (90 degrees or 45 degrees), displaying the center point significantly increased spatial precision. Thus, both computational mechanisms appear to exist. PMID:16542702

  18. Arctic circles, domino tilings and square Young tableaux

    CERN Document Server

    Romik, Dan

    2009-01-01

    The arctic circle theorem of Jockusch, Propp, and Shor asserts that uniformly random domino tilings of an Aztec diamond of high order are frozen with asymptotically high probability outside the "arctic circle" inscribed within the diamond. A similar arctic circle phenomenon has been observed in the limiting behavior of random square Young tableaux. In this paper, we show that random domino tilings of the Aztec diamond are asymptotically related to random square Young tableaux in a more refined sense that looks also at the behavior inside the arctic circle. This is done by giving a new derivation of the limiting shape of the height function of a random domino tiling of the Aztec diamond that uses the large-deviation techniques developed for the square Young tableaux problem in a previous paper by Pittel and the author. The solution of the variational problem that arises for domino tilings is almost identical to the solution for the case of square Young tableaux by Pittel and the author. The analytic techniques...

  19. Revisiting Cyberbullying in Schools Using the Quality Circle Approach

    Science.gov (United States)

    Paul, Simone; Smith, Peter K.; Blumberg, Herbert H.

    2012-01-01

    An earlier study reported the use of Quality Circles (QC) in a UK school in the context of understanding and reducing bullying and cyberbullying. Here, we report further work in the same school setting. The QC approach allows explorative analysis of problems in school settings, whereby students embark on a problem-solving exercise over a period of…

  20. The Circle of Courage and Erikson's Psychological Stages.

    Science.gov (United States)

    Coughlan, Felicity; Welsh-Breetzke, Andrea

    2002-01-01

    Describes the application of positive youth development principles to challenges faced by adolescent females in South Africa. A mainline, Euro-centric theory, Erikson's life stages (1963), is compared with the Circle of Courage model based on Native American Tribal wisdom. The differences and correlation in these approaches are explored through…

  1. School of Urban Wilderness Survival and the Circle of Courage

    Science.gov (United States)

    Marlowe, Jay M.; Pearl, Nick L.; Marlowe, Mike J.

    2009-01-01

    Brendtro, Brokenleg, and Van Bockern (2002) describe the Circle of Courage model for creating environments in which all children can thrive. This approach blends youth developmental research, the wisdom of pioneer workers, and Native American philosophies of child care. This model for reclaiming youth at risk posits four elements as essential for…

  2. Literature Circles: A Perfect Match for Online Instruction

    Science.gov (United States)

    Whittingham, Jeff

    2013-01-01

    This article describes the author's search for an appropriate and satisfying online teaching method. After experimenting with several methods (chat room, discussion board, student led discussion), the author reached back to his face-to-face classroom success with literature circles. This article reports the results of research conducted by the…

  3. Sacred Circles: 2000 Years of North American Indian Art

    Science.gov (United States)

    Journal of American Indian Education, 1977

    1977-01-01

    "Sacred Circles" opened April 16, 1977 at the Nelson Gallery of Art-Atkins Museum of Fine Arts in Kansas City for its only showing in the Americas; the 850 objects on loan from 90 museums and private collectors included the "Adena Pipe" (considered the most important archaeological object found in the eastern US). (JC)

  4. Random walks of a quantum particle on a circle

    International Nuclear Information System (INIS)

    When the quantum planar rotor is put on a lattice, its dynamics can be approximated by random walks on a circle. This allows for fast and accurate Monto Carlo simulations to determine the topological charge of different configurations of the system and thereby the Θ-dependency of the lowest energy levels

  5. Combined rock slope stability and shallow landslide susceptibility assessment of the Jasmund cliff area (Rügen Island, Germany)

    OpenAIRE

    Günther, A.; Thiel, C

    2009-01-01

    In this contribution we evaluated both the structurally-controlled failure susceptibility of the fractured Cretaceous chalk rocks and the topographically-controlled shallow landslide susceptibility of the overlying glacial sediments for the Jasmund cliff area on Rügen Island, Germany. We employed a combined methodology involving spatially distributed kinematical rock slope failure testing with tectonic fabric data, and both physically- and inventory-based shallow landslide susceptibility anal...

  6. IRTROCK: A MATLAB toolbox for contactless recognition of surface and shallow weakness of a rock cliff by infrared thermography

    Science.gov (United States)

    Teza, Giordano; Marcato, Gianluca; Castelli, Eugenio; Galgaro, Antonio

    2012-08-01

    Infrared thermography (IRT) can be used in remote recognition of potential weakening features of a rock cliff like shallow holes, high fracturing, moisture or material inhomogeneities, providing useful information for the corresponding rock mass geo-engineering characterization. A method aimed at such a recognition is proposed here together with its MATLAB implementation (IRTROCK package). It is based on the acquisition of a series of IRT images during the night-time cooling of a rock mass and on the search for possible anomalous thermal transients. The IRT alone is unable to completely characterize a rock mass; a meaningful interpretation of the results requires a geological on-contact survey or other on-contact or contactless techniques. Nevertheless, the results obtained in a portion of the cliff, where a detailed study with other techniques has been carried out, can be advantageously extended to the whole cliff. Moreover, the IRT measurements can be easily and safety repeated over time to evaluate possible changes that affect the studied rock mass. The effectiveness of the proposed approach has been verified in two test sites.

  7. Cliff´s Delta Calculator: A non-parametric effect size program for two groups of observations

    Directory of Open Access Journals (Sweden)

    Guillermo Macbeth

    2011-05-01

    Full Text Available The Cliff´s Delta statistic is an effect size measure that quantifies the amount of difference between two non-parametric variables beyond p-values interpretation. This measure can be understood as a useful complementary analysis for the corresponding hypothesis testing. During the last two decades the use of effect size measures has been strongly encouraged by methodologists and leading institutions of behavioral sciences. The aim of this contribution is to introduce the Cliff´s Delta Calculator software that performs such analysis and offers some interpretation tips. Differences and similarities with the parametric case are analysed and illustrated. The implementation of this free program is fully described and compared with other calculators. Alternative algorithmic approaches are mathematically analysed and a basic linear algebra proof of its equivalence is formally presented. Two worked examples in cognitive psychology are commented. A visual interpretation of Cliff´s Delta is suggested. Availability, installation and applications of the program are presented and discussed.

  8. Molecular characterization and geological microenvironment of a microbial community inhabiting weathered receding shale cliffs.

    Science.gov (United States)

    Cockell, Charles S; Pybus, David; Olsson-Francis, Karen; Kelly, Laura; Petley, David; Rosser, Nick; Howard, Kieren; Mosselmans, Fred

    2011-01-01

    Shales play an important role in many earth system processes including coastal erosion, and they form the foundations of many engineering structures. The geobiology of the interior of pyrite-containing receding shale cliffs on the coast of northeast England was examined. The surface of the weathered shales was characterised by a thin layer of disordered authigenic iron oxyhydroxides and localised acicular, platy and aggregated gypsum, which was characterised by Raman spectroscopy, XAS and SEM. These chemical changes are likely to play an important role in causing rock weakening along fractures at the micron scale, which ultimately lead to coastal retreat at the larger scale. The surface of the shale hosts a novel, low-diversity microbial community. The bacterial community was dominated by Proteobacteria, with phylotypes closely associating with Methylocella and other members of the γ-subdivision. The second largest phylogenetic group corresponded to Nitrospira. The archaeal 16S rRNA phylotypes were dominated by a single group of sequences that matched phylotypes reported from South African gold mines and possessed ammonia monooxygenase (amoA) genes. Both the phylogenetic and the mineral data show that acidic microenvironments play an important role in shale weathering, but the shale has a higher microbial diversity than previously described pyritic acid mine drainage sites. The presence of a potentially biogeochemically active microbial population on the rock surface suggests that microorganisms may contribute to early events of shale degradation and coastal erosion. PMID:20683587

  9. Changing the culture at Calvert Cliffs to focus on root cause analysis

    International Nuclear Information System (INIS)

    In the previous decade, the industry has made a significant investment in technical training and procedure revisions. However, many in the industry remain reactive to emergent issues with a frustrating lack of results. This paper will share with the industry an ongoing program at Calvert Cliffs to develop a culture for problem prevention/problem solving. The approach forming the basis for this focus is Kepner-Tregoe's Problem/Decision Analysis process. Rather than individually targeted training or attitude awareness, the approach here was to integrate the process into work systems and jobs, and train to specific roles. In this manner, skills learned are consistently applied, clearly documentable, and positively supported. To date, the program has resulted in millions of dollars saved and at least 15 days outage time prevented, and has identified several opportunities to revise functional relationships to best focus on results. The clear lesson here is that change and continuous improvement can best occur when results and roles are defined and trained to at the organizational level in addition to the individual task level

  10. Replacement steam generators for Calvert Cliffs, Oconee and future replacement design

    International Nuclear Information System (INIS)

    After the completion of steam generators presently being fabricated, a total of forty replacement steam generators will have been built for fourteen reactor units located at ten reactor sites. This represents approximately $1 billion of manufacture excluding installation costs. Replacement steam generator work began with the initiation of the Millstone 2 steam generator replacement program for Northeast Utilities in 1989. Manufacture is presently underway on replacement recirculating steam generators for Calvert Cliffs Units 1 and 2 plants of Constellation Nuclear (OEM Combustion Engineering) and the once-through steam generators for the Oconee 1, 2 and 3 plants of Duke Power (OEM Babcock and Wilcox). These two sites are the first and second respectively to have applied for and received approval for a life extension of 20 years beyond their original operating license. The application and granting of these license extensions reflects a major change in the nuclear industry over the recent past. The attitude to nuclear power has changed from a relatively defensive strategy to a much more optimistic agenda of utility reorganization, purchase of well performing older plants, replacement of aging components, plant refurbishment, and upgrades and applications for license extension. Possible new plants are also being considered. The paper discusses specific features, attributes, performance and operating experience with replacement steam generators (RSGs) both in service and under construction. Industry issues and design features applicable to future replacement steam generators are also reviewed. (author)

  11. Modelling weathering induced retreat of c-φ cliffs with limited tensile strength

    Science.gov (United States)

    Voulgari, C.

    2015-09-01

    Natural cliffs subject to weathering induced retreat are typically made of hard soils and / or weak rocks exhibiting limited tensile strength. In this paper, the morphologic evolution of uniform c, φ slopes subject to weathering is investigated for a range of values of tensile strengths employing the limit analysis upper bound method. This paper extends the analytical framework set up in [1, 2] by accounting for the limited tensile strength of the ground which was previously disregarded. The solutions were obtained by employing the kinematic method of limit analysis providing rigorous upper bounds to the true collapse values. The inclusion of tension cracks leads to modified analytical expressions of the energy balance equation (the balance between external work and dissipated energy) and as a consequence, of the function whose minimum provides the solution in terms of failure mechanisms and associated values of soil strength. Pre-existing cracks are considered, as well as cracks that form as part of the failure mechanism. It turns out that the presence of tension cracks may significantly alter the size of each landslide contributing to the retrogression of the slope. Results in the form of dimensionless ready-to-use charts are produced for any value of engineering interest of friction angle and slope inclination for the case of dry cracks. Moreover, upper bounds for values not included in the charts can be achieved either by interpolation from the charts or by running the minimisation of the analytical functions provided in the paper.

  12. Modeling Block Failure in Vertical Cliffs of Arctic Coasts Underlain by Permafrost

    Science.gov (United States)

    Pollard, W. H.

    2004-12-01

    Arctic coasts lie at the interface between terrestrial systems dominated by permafrost, and marine systems that are characterized by long periods of ice cover and short periods of open water when wave action and storm activity are important. Permafrost, sea ice and wind-wave conditions are driven by regional and local climate forcing and interact in such a way that a change in one produces feedbacks affecting the other two. However, under predicted climate change scenarios of warming, increased storm activity and sea level rise will profoundly affect all three leading to potentially devastating rates of coastal erosion and permafrost degradation. Permafrost coasts are subject to complex erosional processes, however one of the most poorly understood but probably most important is block failure. Thermo-abrasional falls or block collapses provide the most spectacular form of coastal recession in permafrost areas. This study provides computational models for block failure mechanisms and investigates the relative contribution of horizontal thermo-erosional niches and ice wedges to block failure of permafrost cliffs fronted by a beach.

  13. Microaneurysms detection with the radon cliff operator in retinal fundus images

    Energy Technology Data Exchange (ETDEWEB)

    Giancardo, Luca [ORNL; Meriaudeau, Fabrice [ORNL; Karnowski, Thomas Paul [ORNL; Tobin Jr, Kenneth William [ORNL; Li, Yaquin [University of Tennessee, Knoxville (UTK); Chaum, Edward [University of Tennessee, Knoxville (UTK)

    2010-01-01

    Diabetic Retinopathy (DR) is one of the leading causes of blindness in the industrialized world. Early detection is the key in providing effective treatment. However, the current number of trained eye care specialists is inadequate to screen the increasing number of diabetic patients. In recent years, automated and semi-automated systems to detect DR with color fundus images have been developed with encouraging, but not fully satisfactory results. In this study we present the initial results of a new technique for the detection and localization of microaneurysms, an early sign of DR. The algorithm is based on three steps: candidates selection, the actual microaneurysms detection and a final probability evaluation. We introduce the new Radon Cliff operator which is our main contribution to the field. Making use of the Radon transform, the operator is able to detect single noisy Gaussian-like circular structures regardless of their size or strength. The advantages over existing microaneurysms detectors are manifold: the size of the lesions can be unknown, it automatically distinguishes lesions from the vasculature and it provides a fair approach to microaneurysm localization even without post-processing the candidates with machine learning techniques, facilitating the training phase. The algorithm is evaluated on a publicly available dataset from the Retinopathy Online Challenge.

  14. Microaneurysms detection with the radon cliff operator in retinal fundus images

    Science.gov (United States)

    Giancardo, Luca; Mériaudeau, Fabrice; Karnowski, Thomas P.; Tobin, Kenneth W.; Li, Yaqin; Chaum, Edward

    2010-03-01

    Diabetic Retinopathy (DR) is one of the leading causes of blindness in the industrialized world. Early detection is the key in providing effective treatment. However, the current number of trained eye care specialists is inadequate to screen the increasing number of diabetic patients. In recent years, automated and semi-automated systems to detect DR with color fundus images have been developed with encouraging, but not fully satisfactory results. In this study we present the initial results of a new technique for the detection and localization of microaneurysms, an early sign of DR. The algorithm is based on three steps: candidates selection, the actual microaneurysms detection and a final probability evaluation. We introduce the new Radon Cliff operator which is our main contribution to the field. Making use of the Radon transform, the operator is able to detect single noisy Gaussian-like circular structures regardless of their size or strength. The advantages over existing microaneurysms detectors are manifold: the size of the lesions can be unknown, it automatically distinguishes lesions from the vasculature and it provides a fair approach to microaneurysm localization even without post-processing the candidates with machine learning techniques, facilitating the training phase. The algorithm is evaluated on a publicly available dataset from the Retinopathy Online Challenge.

  15. Innovation and Organizational Communication in Corporate America: The Rhetorical Visions of Managers, Facilitators, and Employees on Quality Circles.

    Science.gov (United States)

    Eyo, Bassey A.

    1992-01-01

    Examines the dynamics of organizational communication following corporate implementation of quality circles. Describes the rhetorical visions of people at three organizational levels closely associated with quality circles: (1) managers; (2) facilitators who organize the quality circles; and (3) employees. (SR)

  16. Circles of support and accountability: How and why they work for sex offenders

    OpenAIRE

    Höing, Mechtild; Bogaerts, Stefan; Vogelvang, Bas

    2013-01-01

    Circles of Support and Accountability (COSA) provide re-integrating sex offenders with a group of trained volunteers who support this rehabilitation process. Effect studies show promising results in reduction of recidivism. This study provides a theoretical underpinning and empirical validation of the COSA intervention model, based on a grounded theory analysis of 38 circle narratives, reflecting the experiences of 21 circles. Four circle functions appear to be essential, with inclusion being...

  17. Transaction Circles with Digital Texts as a Foundation for Democratic Practices

    Science.gov (United States)

    Brown, Sally

    2015-01-01

    Transaction circles weave together elements of guided reading and literature circles in an open conversational structure that supports students as agentive learners. Discourse within these circles utilizing digital informational texts assist in the development of democratic practices even in a time when federal mandates limit curricula and…

  18. Native American Values and Management Education: Envisioning an Inclusive Virtuous Circle

    Science.gov (United States)

    Verbos, Amy Klemm; Gladstone, Joe S.; Kennedy, Deanna M.

    2011-01-01

    Circles are symbols of interconnectedness. Behavioral circles can be vicious or virtuous. Many American Indians are caught in a vicious circle of exclusion from the purported benefits of Westernization, entrapment in its negative elements, and the ongoing undermining of their culture and thus their identities. Yet Native Americans, along with many…

  19. The Chicken and the Egg: Inviting Response and Talk through Socratic Circles

    Science.gov (United States)

    Styslinger, Mary E.; Pollock, Timothy

    2010-01-01

    This collaborative inquiry answers the following questions: 1) What is the nature of talk during Socratic Circles? 2) What is student response to talk? 3) How might knowing more about student response to talk and the nature of talk improve teaching during Socratic Circles? The article first describes the process of implementing Socratic Circles,…

  20. Calculation of Latitude and Longitude for Points on Perimeter of a Circle on a Sphere

    Energy Technology Data Exchange (ETDEWEB)

    Morris, Heidi E. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2015-08-14

    This document describes the calculation of the Earth-Centered Earth Fixed (ECEF) coordinates for points lying on the perimeter of a circle. Here, the perimeter of the circle lies on the surface of the sphere and the center of the planar circle is below the surface. These coordinates are converted to latitude and longitude for mapping fields on the surface of the earth.

  1. Incidental discovery of circle contact lens by MRI: you can’t scan my poker face, circle contact lens as a potential MRI hazard

    International Nuclear Information System (INIS)

    Circle contact lenses, also known as color contact lenses and big eye contact lenses, are a type of cosmetic contact lens. It is not generally known that a circle contact lens usually contains iron oxide and other metals, which means their use during magnetic resonance imaging (MRI) is a potential hazard. We present a rare case of incidental discovery of circle contact lenses by MRI and MRI images of circle lenses in vitro. Circle contact lenses usually contain iron oxide, which is a known source of susceptibility artifact on MRI. Not only radiologists and radiographers but also referring physicians should be familiar with the imaging findings and potential risk of scanning circle contact lenses by MRI

  2. Sampling great circles at their rate of innovation

    Science.gov (United States)

    Deslauriers-Gauthier, Samuel; Marziliano, Pina

    2013-09-01

    In this work, we show that great circles, the intersection of a plane through the origin and a sphere centered at the origin, can be perfectly recovered at their rate of innovation. Specifically, we show that 4K(8K - 7) + 7 samples are sufficient to perfectly recover K great circles, given an appropriate sampling scheme. Moreover, we argue that the number of samples can be reduced to 2K(4K - 1) while maintaining accurate results. This argument is supported by our numerical results. To improve the robustness to noise of our approach, we propose a modification that uses all the available information, instead of the critical amount. The increase in accuracy is demonstrated using numerical simulations.

  3. T-duality for circle bundles via noncommutative geometry

    CERN Document Server

    Mathai, Varghese

    2013-01-01

    Recently Baraglia showed how topological T-duality can be extended to apply not only to principal circle bundles, but also to non-principal circle bundles. We show that his results can also be recovered via two other methods: the homotopy-theoretic approach of Bunke and Schick, and the noncommutative geometry approach which we previously used for principal torus bundles. This work has several interesting byproducts, including a study of the K-theory of crossed products by Isom(R), the universal cover of O(2), and some interesting facts about equivariant K-theory for Z/2. In the final section of this paper, these results are extended to the case of bundles with singular fibers, or in other words, non-free O(2)-actions.

  4. Climate Change and Tourism in the Arctic Circle

    OpenAIRE

    Richard S.J. Tol; Sharon Walsh

    2012-01-01

    We estimate grid level tourist numbers to Arctic Circle countries under a number of climate change scenarios. At present, the highest tourism volumes are found in Canada and most of the Scandinavian countries. In general, it appears that tourists are attracted to regions with better infrastructure and nicer cities. Under each climate change scenario, Russia sees a significant increase in tourist numbers because Russia is big, its climate is expected to show some improvement and it is relative...

  5. Taking a literature circles approach to teach Academic English

    OpenAIRE

    Graham-Marr Alastair; Pellowe William

    2016-01-01

    Literature circles (LC), an activity framework for classroom discussion, has been adapted for EFL classes to help students engage more deeply with reading texts. In this approach, students read texts outside of class, and discuss the texts in class, using a specified discussion framework. Originally developed for L1 classes as a tool for teaching literature, LC has been adapted for EFL classes, not only to help develop reading skills, but also to help students develop their discussion skills....

  6. CS Circles: An In-Browser Python Course for Beginners

    OpenAIRE

    Pritchard, David; Vasiga, Troy

    2012-01-01

    Computer Science Circles is a free programming website for beginners that is designed to be fun, easy to use, and accessible to the broadest possible audience. We teach Python since it is simple yet powerful, and the course content is well-structured but written in plain language. The website has over one hundred exercises in thirty lesson pages, plus special features to help teachers support their students. It is available in both English and French. We discuss the philosophy behind the cour...

  7. Phase-Locking Dynamics in Coupled Circle-Map Lattices

    Institute of Scientific and Technical Information of China (English)

    ZHENG Zhi-Gang

    2002-01-01

    The phase-locking dynamics in 1D and 2D lattices of non-identical coupled circle maps is explored. Aglobal phase locking can be attained via a cascade of clustering processes with the increase of the coupling strength.Collective spatiotemporal dynamics is observed when a global phase locking is reached. Crisis-induced desynchronizationis found, and its consequent spatiotemporal chaos is studied.

  8. Confidence circles for correspondence analysis using orthogonal polynomials

    OpenAIRE

    Eric J. Beh

    2001-01-01

    An alternative approach to classical correspondence analysis was developed in [3] and involves decomposing the matrix of Pearson contingencies of a contingency table using orthogonal polynomials rather than via singular value decomposition. It is especially useful in analysing contingency tables which are of an ordinal nature. This short paper demonstrates that the confidence circles of Lebart, Morineau and Warwick (1984) for the classical approach can be applied to ordinal correspondence anal...

  9. The water erosion processes in the retreat erosive of cliff on soft rocks in the province of Cadiz (Spain); Los procesos de erosion hidrica en el retroceso erosivo de acantilados sobre rocas blandas en la provincia de Cadiz

    Energy Technology Data Exchange (ETDEWEB)

    Rendon Aragon, J. J.; Gracia Prieto, F. J.; Rio Rodriguez, L. del

    2009-07-01

    The littoral cliffs on soft materials of the Atlantic Cadiz coast show an important activity of the fresh water erosion processes, sometimes even more significant than the marine erosion processes. The connection of the lower cliffs with sandy beaches favours aeolian sand invasion, which fills previous rills and reduces the water erosion intensity by increasing infiltration. Cliff retreat and rill erosion measurement by using erosion sticks has shown very variables values, most of them higher than the estimated error of the employed methods. This indicates the existence of other factors influencing the distribution of water erosion processes along these cliffs, which have to be studied through different techniques. (Author) 5 refs.

  10. Deviation from Alday-Maldacena duality for wavy circle

    International Nuclear Information System (INIS)

    Alday-Maldacena conjecture is stated in this paper that the area AΠ of the minimal surface in AdS5 space with a boundary Π, located in Euclidean space at infinity of AdS5, coincides with a double integral DΠ along Π, the Abelian Wilson average in an auxiliary dual model. This comes from Alday and Maldacena's original proposal and the BDS conjecture on the extrapolation of the MHV amplitudes. The boundary Π is a polygon formed by momenta of n external light-like particles in N=4 SYM theory, and in a certain n=∞ limit it can be substituted by an arbitrary smooth curve (wavy circle). The Alday-Maldacena conjecture is known to be violated for n>5, when it fails to be supported by the peculiar global dual conformal invariance, however, the structure of deviations remains obscure. The case of wavy lines can appear more convenient for analysis of these deviations due to the systematic method developed in [H. Itoyama, A. Mironov, A. Morozov, Anomaly in n=∞ Alday-Maldacena duality for wavy circle, JHEP 0807 (2008) 024, (arXiv:0803.1547)] for (perturbative) evaluation of minimal areas, which is not yet available in the presence of angles at finite n. We correct a mistake in that paper and explicitly evaluate the h2h-bar2 terms, where the first deviation from the Alday-Maldacena duality arises for the wavy circle.

  11. Localization techniques in circle-equivariant KK-theory

    CERN Document Server

    Emerson, Heath

    2010-01-01

    Let T be the circle and A be a T-C*-algebra. Then the T-equivariant K-theory of A is a module over the representation ring of the circle. The latter is a Laurent polynomial ring. Using the support of the module as an invariant, and techniques of Atiyah, Bott and Segal, we deduce that there are examples of T-C*-algebras A not KK^T-equivalent to any commutative T-C*-algebra. This is in contrast to the non-equivariant situation, in which any C*-algebra in the boostrap category is KK-equivalent to a commutative one. Our examples arise from dynamics, and include Cuntz-Krieger algebras with their usual circle actions. Using similar techniques, we also prove an equivariant version of the Lefschetz fixed-point formula. This is a special case of a result with Ralf Meyer that applies to general compact connected groups. The Lefschetz theorem equates the module trace of the module map of the T-equivariant K-theory of a smooth compact manifold induced by an equivariant self-correspondence of the manifold, with an appropr...

  12. Sphalerons of O(3) nonlinear sigma model on a circle

    International Nuclear Information System (INIS)

    A series of saddle point solutions of O(3) nonlinear sigma model with symmetry breaking term in 1 + 1 dimensions are obtained by imposing boundary condition either periodic or partially antiperiodic (O(3) sphalerons on a circle). Under the periodic boundary condition, classical features of the O(3) sphalerons are similar to scalar sphalerons of φ4 model on a circle by Manton and Samols. Under the partially antiperiodic boundary condition, the lowest of the O(3) sphalerons coincides in the limit of infinite spatial domain with the O(3) sphaleron by Mottola and Wipf. In particular, zero and negative modes of them are examined in detail. An estimate of transition rate over the lowest O(3) sphaleron at finite temperature is made, and some remarks on simulating the transition on a lattice are given. One to one correspondence between these O(3) sphalerons on a circle and a series of (possible) classical solutions of SU(2) gauge-Higgs model, to which the electroweak sphaleron S and new sphaleron S* belong, is discussed. (author)

  13. Influence of meteorological factors on rockfall occurrence in a middle mountain limestone cliff

    Science.gov (United States)

    D'Amato, Julie; Hantz, Didier; Guerin, Antoine; Jaboyedoff, Michel; Baillet, Laurent; Mariscal, Armand

    2016-03-01

    The influence of meteorological conditions on rockfall occurrence has been often highlighted, but knowledge of it is still not sufficient due to the lack of exhaustive and precise rockfall databases. In this study, rockfalls have been detected in a limestone cliff by annual terrestrial laser scanning, and dated by photographic survey over a period of 2.5 years. A near-continuous survey (one photo every 10 min) with a wide-angle lens has made it possible to date 214 rockfalls larger than 0.1 m3, and a monthly survey with a telephoto lens has dated 854 rockfalls larger than 0.01 m3. Analysis of the two databases shows that the rockfall frequency can be multiplied by a factor as high as 7 during freeze-thaw episodes and 26 when the mean rainfall intensity (since the beginning of the rainfall episode) is higher than 5 mmh-1. Based on these results, a three-level scale has been proposed for predicting the temporal variations of rockfall frequency. The more precise database and freeze-thaw episode definition make it possible to distinguish different phases in freeze-thaw episodes: negative temperature cooling periods, negative temperature warming periods and thawing periods. It appears that rockfalls occur more frequently during warming and thawing periods than during cooling periods. It can be inferred that rockfalls are caused by thermal ice dilatation rather than by dilatation due to the phase transition. But they may occur only when the ice melts, because the cohesion of the ice-rock interface can be sufficient to hold the rock compartment which has been cut.

  14. Pre-failure behaviour of an unstable limestone cliff from displacement and seismic data

    Directory of Open Access Journals (Sweden)

    J.-L. Got

    2010-04-01

    Full Text Available We monitored the displacement and seismic activity of an unstable vertical rock slice in a natural limestone cliff of the southeast Vercors massif, southeast France, during the months preceding its collapse. Displacement measurements showed an average acceleration of the movement of its top, with clear increases in the displacement velocity and in the discrete seismic event production rate during periods where temperature falls, with more activity when rainfall or frost occurs. Crises of discrete seismic events produce high amplitudes in periodograms, but do not change the high frequency base noise level rate. We infer that these crises express the critical crack growth induced by water weakening (from water vapor condensation or rain of the rock strength rather than to a rapid change in applied stresses. Seismic noise analysis showed a steady increase in the high frequency base noise level and the emergence of spectral modes in the signal recorded by the sensor installed on the unstable rock slice during the weeks preceding the collapse. High frequency seismic noise base level seems to represent subcritical crack growth. It is a smooth and robust parameter whose variations are related to generalized changes in the rupture process. Drop of the seismic noise amplitude was concomitant with the emergence of spectral modes – that are compatible with high-order eigenmodes of the unstable rock slice – during the later stages of its instability. Seismic noise analysis, especially high frequency base noise level analysis may complement that of inverse displacement velocity in early-warning approaches when strong displacement fluctuations occur.

  15. Population genetics of self-incompatibility in a clade of relict cliff-dwelling plant species

    Science.gov (United States)

    Silva, Jose L.; Brennan, Adrian C.; Mejías, José A.

    2016-01-01

    The mating systems of species in small or fragmented populations impact upon their persistence. Small self-incompatible (SI) populations risk losing S allele diversity, responsible for the SI response, by drift thereby limiting mate availability and leading to population decline or SI system breakdown. But populations of relict and/or endemic species have resisted these demographic conditions over long periods suggesting their mating systems have adapted. To address a lack of empirical data on this topic, we studied the SI systems of three relict cliff-dwelling species of Sonchus section Pustulati (Asteraceae): S. masguindalii, S. fragilis and S. pustulatus in the western Mediterranean region. We performed controlled pollinations within and between individuals to measure index of SI (ISI) expression and identify S alleles in multiple population samples. Sonchus masguindalii and S. pustulatus showed strong SI (ISI = 0.6–1.0) compared to S. fragilis (ISI = 0.1–0.7). Just five S alleles were estimated for Spanish S. pustulatus and a moderate 11-15 S alleles for Moroccan S. pustulatus and S. fragilis, respectively. The fact that autonomous fruit set was generally improved by active self-pollination in self-compatible S. fragilis suggests that individuals with weak SI can show a wide range of outcrossing levels dependent on the degree of self or outcross pollen that pollinators bear. We conclude that frequent S allele dominance interactions that mask the incompatibility interactions of recessive S alleles leading to higher mate availability and partial breakdown of SI leading to mixed mating, both contribute to reproductive resilience in this group. PMID:27154621

  16. Experimental study of circle grid fractal pattern on turbulent intensity in pipe flow

    International Nuclear Information System (INIS)

    Fractal turbulence is deemed much more efficient than grid turbulence in terms of a turbulence generation. In this paper, the hotwire experimental results for the circle grids fractal pattern as a turbulent generator will be presented. The self-similar edge characteristic of the circle grid fractal pattern is thought to play a vital role in the enhancement of turbulent intensity. Three different beta ratios of perforated plates based on circle grids fractal pattern were used in the experimental work and each paired with standard circle grids with similar porosity. The objectives were to study the fractal scaling influence on the flow and also to explore the potential of the circle grids fractal pattern in enhancing the turbulent intensity. The results provided an excellent insight of the fractal generated turbulence and the fractal flow physics. Across the circle grids fractal pattern, the pressure drop was lower but the turbulent intensity was higher than those across the paired standard circle grids

  17. 3-D Resistivity Tomography for Cliff Stability Study at the D-Day Pointe du Hoc Historic Site in Normandy, France

    Science.gov (United States)

    Udphuay, S.; Everett, M. E.; Guenther, T.; Warden, R. R.

    2007-12-01

    The D-Day invasion site at Pointe du Hoc in Normandy, France is one of the most important World War II battlefields. The site remains today a valuable historic cultural resource. However the site is vulnerable to cliff collapses that could endanger the observation post building and U.S. Ranger memorial located just landward of the sea stack, and an anti-aircraft gun emplacement, Col. Rudder's command post, located on the cliff edge about 200 m east of the observation post. A 3-D resistivity tomography incorporating extreme topography is used in this study to provide a detailed site stability assessment with special attention to these two buildings. Multi-electrode resistivity measurements were made across the cliff face and along the top of the cliff around the two at-risk buildings to map major subsurface fracture zones and void spaces that could indicate possible accumulations and pathways of groundwater. The ingress of acidic groundwater through the underlying carbonate formations enlarges pre-existing tectonic fractures via limestone dissolution and weakens the overall structural integrity of the cliff. The achieved 3-D resistivity tomograms provide diagnostic subsurface resistivity distributions. Resistive zones associated with subsurface void spaces have been located. These void spaces constitute a stability geohazard as they become significant drainage routes during and after periods of heavy rainfalls.

  18. Experimental study of turbulent supercritical open channel water flow as applied to the CLiFF concept

    International Nuclear Information System (INIS)

    An experimental study of turbulent open channel water flows was conducted that simulated basic features of the flow of molten salt in the convective liquid flow first-wall (CLiFF) concept, which is a part of the Advanced Power Extraction (APEX) study. Unlike many other studies of open channel flows, the present one concentrates on a supercritical flow regime, in which surface waviness and wave-turbulence interaction are the most important processes that determine the heat transfer rate in CLiFF flows. The current study covers the Reynolds number and Froude number range of 1x104-6x104 and 150-250, respectively, with a fixed chute inclination angle of 30 deg. . The statistical characteristics of the wavy interface were obtained with an ultrasound transducer. A spectral analysis of the oscillating flow thickness shows that a major part of the spectrum is presented by long finite-amplitude waves (f=10-50 Hz), which carry a significant part of the volumetric flux. Based on dye technique observations, short waves are mostly responsible for mixing the liquid at the surface. The surface waviness can be characterized by a parameter built through the mean flow thickness, h, and its standard deviation (S.D.), σ, as 0.5σ/h, which is almost constant, 0.1, in all experiments. The mean flow thickness variations are predicted well with the 'K-ε' model of turbulence [Int. J. Eng. Sci. 40/6 (2002) 693], but the fluctuations are not resolved. Thermal images of the free surface measured by an infrared (IR) camera are very non-uniform and show the 'strike' structures in the form of elongated strips of 'hotter' and 'cooler' liquid. The present observations are the first steps to better understanding and quantitative predictions of liquid wall flows in the CLiFF design

  19. Microbial Biomass and Population Densities of Non-Sorted Circles in High Arctic Ecosystems

    Science.gov (United States)

    Rivera-Figueroa, F.; González, G.; Gould, W. A.; Cantrell, S.; Pérez, J.

    2006-12-01

    Non-sorted circles are small patterned-ground features that occur in arctic soils as a result of intensive frost heave action. This tundra feature has been extensively described. However, little is known about the ecological relationships between this pattern and above- and belowground organisms. In this study, we compare the biomass and populaton densities of microbes in non-sorted circles and the vegetated surrounding soils (inter-circles) in the High Arctic. We collected soil samples during the summer of 2004 and 2005 on Banks and Prince Patrick and Ellef Ringnes Islands, Canada. Soil samples (0-10 cm) were gathered from non- sorted circles and inter-circles along a topographic sequence: dry (ridge), mesic (mid slope) and wet (valley) and along three transects in zonal (mesic) sites on each island. We estimated total microbial biomass and bacterial population densities using substrate induce respiration (SIR) and the most probable number method (MPN), respectively. We also isolated soil fungi using Rose Bengal and Saboraud Dextrose culture media. We are in the process of analyzing the catena samples using a terminal restriction fragment length polymorphism (TRFLP) technique of PCR-amplified 16S rRNA. Based on the SIR trials, the average microbial biomass at the mid slope position in the Banks site (Green Cabin) was 0.49 mg C g-1 dry soil in the non- sorted circles and 0.95 mg C g-1 dry soil in the inter-circles. At Prince Patrick Island (Mould Bay) the microbial biomass was 0.54 mg C g-1 dry soil in the non-sorted circles and 0.74 mg C g-1 dry soil in the inter-circles. In Ellef Ringnes (Isachsen) the microbial biomass was 0.09 mg C g-1 dry soil in the non- sorted circles and 0.14 mg C g-1 dry soil in the inter-circles. At the mesic site at Green Cabin, bacteria vary from 2.92 x 106 cell g-1 dry soil in the non-sorted circles to 6.74 x 106 cell g-1 dry soil in the inter-circles. At Mould Bay the range was 7.67 x 105 cells g-1 dry soil in the non-sorted circles

  20. Application of an LWR operator information systems analysis to the Calvert Cliffs Nuclear Power Plant-Unit 1

    International Nuclear Information System (INIS)

    This report describes the formulation and demonstration of a method to help utilities achieve their objectives of nuclear plant safety and economy. Called The Integrated Approach to Economic and Safe Nuclear Power Production, it is a framework for showing how plant equipment and personnel work together in successful nuclear operations. It is being applied to the Calvert Cliffs Nuclear Power Plant Unit 1 to evaluate the current plant information systems and, should it appear to be desirable, to identify potential cost-beneficial improvements to plant information systems

  1. Stereoscopic Machine-Vision System Using Projected Circles

    Science.gov (United States)

    Mackey, Jeffrey R.

    2010-01-01

    A machine-vision system capable of detecting obstacles large enough to damage or trap a robotic vehicle is undergoing development. The system includes (1) a pattern generator that projects concentric circles of laser light forward onto the terrain, (2) a stereoscopic pair of cameras that are aimed forward to acquire images of the circles, (3) a frame grabber and digitizer for acquiring image data from the cameras, and (4) a single-board computer that processes the data. The system is being developed as a prototype of machine- vision systems to enable robotic vehicles ( rovers ) on remote planets to avoid craters, large rocks, and other terrain features that could capture or damage the vehicles. Potential terrestrial applications of systems like this one could include terrain mapping, collision avoidance, navigation of robotic vehicles, mining, and robotic rescue. This system is based partly on the same principles as those of a prior stereoscopic machine-vision system in which the cameras acquire images of a single stripe of laser light that is swept forward across the terrain. However, this system is designed to afford improvements over some of the undesirable features of the prior system, including the need for a pan-and-tilt mechanism to aim the laser to generate the swept stripe, ambiguities in interpretation of the single-stripe image, the time needed to sweep the stripe across the terrain and process the data from many images acquired during that time, and difficulty of calibration because of the narrowness of the stripe. In this system, the pattern generator does not contain any moving parts and need not be mounted on a pan-and-tilt mechanism: the pattern of concentric circles is projected steadily in the forward direction. The system calibrates itself by use of data acquired during projection of the concentric-circle pattern onto a known target representing flat ground. The calibration- target image data are stored in the computer memory for use as a

  2. Connecting a Set of Circles with Minimum Sum of Radii

    CERN Document Server

    Chambers, Erin Wolf; Hoffmann, Hella-Franziska; Marinakis, Dimitri; Mitchell, Joseph S B; Srinivasan, Venkatesh; Stege, Ulrike; Whitesides, Sue

    2011-01-01

    We consider the problem of assigning radii to a given set of points in the plane, such that the resulting set of circles is connected, and the sum of radii is minimized. We show that the problem is polynomially solvable if a connectivity tree is given. If the connectivity tree is unknown, the problem is NP-hard if there are upper bounds on the radii and open otherwise. We give approximation guarantees for a variety of polynomial-time algorithms, describe upper and lower bounds (which are matching in some of the cases), provide polynomial-time approximation schemes, and conclude with experimental results and open problems.

  3. The Importance of Implementation of the Quality Circles in Romania

    Directory of Open Access Journals (Sweden)

    NELU FLOREA

    2006-01-01

    Full Text Available Quality Circles would represent an effective and less expensive solution in order to improve quality level in Romanian companies which manufacture products, would motivate and turn to account more the human resources potential, transforming it from cost into resource, would generate operative solutions to solve many problems which a company must confront with day by day. The effect is overall better working climate, improved employee health, safety and morale, helping to enlarge a mentality focused on a high quality level for company‘s products.

  4. Random Domino Tilings and the Arctic Circle Theorem

    OpenAIRE

    Jockusch, William; Propp, James; Shor, Peter

    1998-01-01

    In this article we study domino tilings of a family of finite regions called Aztec diamonds. Every such tiling determines a partition of the Aztec diamond into five sub-regions; in the four outer sub-regions, every tile lines up with nearby tiles, while in the fifth, central sub-region, differently-oriented tiles co-exist side by side. We show that when n is sufficiently large, the shape of the central sub-region becomes arbitrarily close to a perfect circle of radius n/sqrt(2) for all but a ...

  5. Deviation from Alday-Maldacena Duality For Wavy Circle

    OpenAIRE

    Galakhov, D.; Itoyama, H.; Mironov, A.; Morozov, A.

    2008-01-01

    Alday-Maldacena conjecture is that the area A_P of the minimal surface in AdS_5 space with a boundary P, located in Euclidean space at infinity of AdS_5, coincides with a double integral D_P along P, the Abelian Wilson average in an auxiliary dual model. The boundary P is a polygon formed by momenta of n external light-like particles in N=4 SYM theory, and in a certain n=infty limit it can be substituted by an arbitrary smooth curve (wavy circle). The Alday-Maldacena conjecture is known to be...

  6. The Phenomenological Circle and the Unity of Life and Thought.

    Science.gov (United States)

    Atwood, George E; Stolorow, Robert D

    2016-06-01

    This paper describes the important role of our deep immersions in philosophy in the development of our phenomenological-contextualist approach to psychoanalysis. Influenced most particularly by the phenomenological movement, our collaborative dialogue over more than four decades has led us to a shared commitment to reflection upon the philosophical underpinnings and constitutive contexts of origin of all our theoretical ideas. The growth of our thinking follows an endlessly recurring phenomenological circle joining theoretical perspectives with the inquirers from whose emotional worlds they arise. PMID:27248037

  7. Social Circles: A 3D User Interface for Facebook

    Science.gov (United States)

    Rodrigues, Diego; Oakley, Ian

    Online social network services are increasingly popular web applications which display large amounts of rich multimedia content: contacts, status updates, photos and event information. Arguing that this quantity of information overwhelms conventional user interfaces, this paper presents Social Circles, a rich interactive visualization designed to support real world users of social network services in everyday tasks such as keeping up with friends and organizing their network. It achieves this by using 3D UIs, fluid animations and a spatial metaphor to enable direct manipulation of a social network.

  8. Detecting Circles Using a Two-Stage Approach

    Institute of Scientific and Technical Information of China (English)

    Wen-Yen Wu

    2014-01-01

    We propose a two-stage method for detecting circular objects in this paper. In the first stage, curves are divided as linear segments or nonlinear segments. A least square estimator is used to find the estimated centers and radii of the nonlinear segments in the second stage. The found centers and radii are then evaluated to see if there exist circles in the nonlinear segments. Both of the broken and occluded circular objects are evaluated for the proposed method. From the experimental results, it is seen that the proposed method is efficient.

  9. Chimera states in coupled sine-circle map lattices

    OpenAIRE

    Nayak, Chitra R.; Gupte, Neelima

    2010-01-01

    Systems of coupled oscillators have been seen to exhibit chimera states, i.e. states where the system splits into two groups where one group is phase locked and the other is phase randomized. In this work, we report the existence of chimera states in a system of two interacting populations of sine circle maps. This system also exhibits the clustered chimera behavior seen earlier in delay coupled systems. Rich spatio-temporal behavior is seen in different regimes of the phase diagram.We carry ...

  10. Slope mass movements on rocky sea-cliffs: A power-law distributed natural hazard on the Barlavento Coast, Algarve, Portugal

    Science.gov (United States)

    Teixeira, Sebastião Braz

    2006-06-01

    The coast of the Central Algarve, Portugal, is dominated by sea-cliffs, cut on Miocene calcarenites; here, the main coastal geologic hazards result from the conflict between human occupation and sea-cliff recession. The evolution of this rocky coast occurs through an intermittent and discontinuous series of slope mass movements, along a 46 km cliff front. For the last 30 years, the increase of tourism occupation has amplified the risks to both people and buildings. In the last decade we have seen several accidents caused by cliff failure, which killed or wounded people and destroyed several buildings. The definition of buffer zones limited by hazard lines parallel to the cliff edge, where land use is restricted, is a widely used and effective preventive measure for mitigating risk. Rocky coasts typically show a slow cliff evolution. The process of gathering statistically significant field inventories of mass movements is, thus, very long. Although mass movement catalogues provide fundamental information on sea cliff evolution patterns and are an outstanding tool in hazard assessment, published data sets are still rare. In this work, we use two inventories of mass movement width, recorded on sea cliffs cut on Miocene calcarenites: a nine year long continuous field inventory (1995-2004) with 140 recorded events, and a 44 year long catalogue based on comparative analysis of aerial photographs (1947-1991), that includes 177 events. The cumulative frequency-width distributions of both data sets fit, above a critical width value corresponding to the threshold of full completeness of the inventories, to power-law distributions. The knowledge of the limits of the catalogues enabled the construction of a 53 year long record inventory over the range of mean width ⩾3 m ( n=167 events) and maximum width ⩾4 m ( n=155 events). The data assembled corresponds to a partial series and was converted to a return period-size distribution. Both return period-width distributions

  11. Experiments to investigate direct containment heating phenomena with scaled models of the Calvert Cliffs Nuclear Power Plant

    International Nuclear Information System (INIS)

    The Surtsey Test Facility is used to perform scaled experiments simulating High Pressure Melt Ejection accidents in a nuclear power plant (NPP). The experiments investigate the effects of direct containment heating (DCH) on the containment load. The results from Zion and Surry experiments can be extrapolated to other Westinghouse plants, but predicted containment loads cannot be generalized to all Combustion Engineering (CE) plants. Five CE plants have melt dispersal flow paths which circumvent the main mitigation of containment compartmentalization in most Westinghouse PWRs. Calvert Cliff-like plant geometries and the impact of codispersed water were addressed as part of the DCH issue resolution. Integral effects tests were performed with a scale model of the Calvert Cliffs NPP inside the Surtsey test vessel. The experiments investigated the effects of codispersal of water, steam, and molten core stimulant materials on DCH loads under prototypic accident conditions and plant configurations. The results indicated that large amounts of coejected water reduced the DCH load by a small amount. Large amounts of debris were dispersed from the cavity to the upper dome (via the annular gap). 22 refs., 84 figs., 30 tabs

  12. Experiments to investigate direct containment heating phenomena with scaled models of the Calvert Cliffs Nuclear Power Plant

    Energy Technology Data Exchange (ETDEWEB)

    Blanchat, T.K.; Pilch, M.M.; Allen, M.D.

    1997-02-01

    The Surtsey Test Facility is used to perform scaled experiments simulating High Pressure Melt Ejection accidents in a nuclear power plant (NPP). The experiments investigate the effects of direct containment heating (DCH) on the containment load. The results from Zion and Surry experiments can be extrapolated to other Westinghouse plants, but predicted containment loads cannot be generalized to all Combustion Engineering (CE) plants. Five CE plants have melt dispersal flow paths which circumvent the main mitigation of containment compartmentalization in most Westinghouse PWRs. Calvert Cliff-like plant geometries and the impact of codispersed water were addressed as part of the DCH issue resolution. Integral effects tests were performed with a scale model of the Calvert Cliffs NPP inside the Surtsey test vessel. The experiments investigated the effects of codispersal of water, steam, and molten core stimulant materials on DCH loads under prototypic accident conditions and plant configurations. The results indicated that large amounts of coejected water reduced the DCH load by a small amount. Large amounts of debris were dispersed from the cavity to the upper dome (via the annular gap). 22 refs., 84 figs., 30 tabs.

  13. Spectra of mothers of premature children about the educative circle of culture.

    Science.gov (United States)

    Couto, Camila Santos do; Tupinambá, Milena Colares; Rangel, Aldecira Uchôa Monteiro; Frota, Mirna Albuquerque; Martins, Elis Mayre da Costa Silveira; Nobre, Caroline Soares; Landim, Átima Luna Pinheiro

    2014-12-01

    We sought to know the spectra of mothers of premature children regarding their experience with circle of culture of educational character and identifying the learning provided by the circle of culture about newborn care after hospital discharge. A descriptive study was performed in a hospital located in Fortaleza, Brazil. Three meetings of a circle of culture with 17 mothers of premature newborns were performed. The interpretation of the corpus was performed using thematic analysis. Emerged from the categories: Maternal experience in a circle of culture; Promoted social support among mothers through the circle of culture; and Learning provided by the circle of culture. It was concluded that teaching parents during the hospitalization of the child should be held in a way to involve parents in the care of the newborn, provide moments of health education, opportunities for support and dialogue between professionals and family. PMID:25830729

  14. SPECTRA OF MOTHERS OF PREMATURE CHILDREN ABOUT THE EDUCATIVE CIRCLE OF CULTURE

    Directory of Open Access Journals (Sweden)

    Camila Santos do Couto

    2014-12-01

    Full Text Available Abstract We sought to know the spectra of mothers of premature children regarding their experience with circle of culture of educational character and identifying the learning provided by the circle of culture about newborn care after hospital discharge. A descriptive study was performed in a hospital located in Fortaleza, Brazil. Three meetings of a circle of culture with 17 mothers of premature newborns were performed. The interpretation of the corpus was performed using thematic analysis. Emerged from the categories: Maternal experience in a circle of culture; Promoted social support among mothers through the circle of culture; and Learning provided by the circle of culture. It was concluded that teaching parents during the hospitalization of the child should be held in a way to involve parents in the care of the newborn, provide moments of health education, opportunities for support and dialogue between professionals and family.

  15. Pre-big-bang cosmology and circles in the cosmic microwave background

    International Nuclear Information System (INIS)

    We examine the possibility that circles in the cosmic microwave background could be formed by the interaction of a gravitational wave pulse emitted in some pre-big-bang phase of the universe with the last scattering surface. We derive the expected size distribution of such circles, as well as their typical ring width and (for concentric circles) angular separation. We apply these results, in particular, to conformal cyclic cosmology, ekpyrotic cosmology as well as loop quantum cosmology with and without inflation in order to determine how the predicted geometric properties of these circles would vary from one model to the other, and thus, if detected, could allow us to differentiate between various pre-big-bang cosmological models. We also obtain a relation between the angular ring width and the angular radius of such circles that can be used in order to determine whether or not circles observed in the cosmic microwave background are due to energetic pre-big-bang events.

  16. Multi Circle Detection on Images Using Artificial Bee Colony (ABC) Optimization

    OpenAIRE

    Cuevas, Erik; Sencion-Echauri, Felipe; Zaldivar, Daniel; Cisneros, Marco Perez

    2014-01-01

    Hough transform (HT) has been the most common method for circle detection, exhibiting robustness, but adversely demanding considerable computational effort and large memory requirements. Alternative approaches include heuristic methods that employ iterative optimization procedures for detecting multiple circles. Since only one circle can be marked at each optimization cycle, multiple executions must be enforced in order to achieve multi detection. This paper presents an algorithm for automati...

  17. SPECTRA OF MOTHERS OF PREMATURE CHILDREN ABOUT THE EDUCATIVE CIRCLE OF CULTURE

    OpenAIRE

    Camila Santos do Couto; Milena Colares Tupinambá; Aldecira Uchôa Monteiro Rangel; Mirna Albuquerque Frota; Elis Mayre da Costa Silveira Martins; Caroline Soares Nobre; átima Luna Pinheiro Landim

    2014-01-01

    Abstract We sought to know the spectra of mothers of premature children regarding their experience with circle of culture of educational character and identifying the learning provided by the circle of culture about newborn care after hospital discharge. A descriptive study was performed in a hospital located in Fortaleza, Brazil. Three meetings of a circle of culture with 17 mothers of premature newborns were performed. The interpretation of the corpus was performed using thematic analysis. ...

  18. High frequency seismic monitoring of debris flows at Chalk Cliffs (CO), USA

    Science.gov (United States)

    Coviello, Velio; Kean, Jason; Smith, Joel; Coe, Jeffrey; Arattano, Massimo; McCoy, Scott

    2015-04-01

    A growing number of studies adopt passive seismic monitoring techniques to investigate slope instabilities and landslide processes. These techniques are attractive and convenient because large areas can be monitored from a safe distance. This is particularly true when the phenomena under investigation are rapid and infrequent mass movements like debris flows. Different types of devices are used to monitor debris flow processes, but among them ground vibration detectors (GVDs) present several, specific advantages that encourage their use. These advantages include: (i) the possibility to be installed outside the channel bed, (ii) the high adaptability to different and harsh field conditions, and (iii) the capability to detect the debris flow front arrival tens of seconds earlier than contact and stage sensors. Ground vibration data can provide relevant information on the dynamics of debris flows such as timing and velocity of the main surges. However, the processing of the raw seismic signal is usually needed, both to obtain a more effective representation of waveforms and to decrease the amount of data that need to be recorded and analyzed. With this objective, the methods of Amplitude and Impulses are commonly adopted to transform the raw signal to a 1-Hz signal that allows for a more useful representation of the phenomenon. In that way, peaks and other features become more visible and comparable with data obtained from other monitoring devices. In this work, we present the first debris flows seismic recordings gathered in the Chalk Cliffs instrumented basin, central Colorado, USA. In May 2014, two 4.5-Hz, three-axial geophones were installed in the upper part of the catchment. Seismic data are sampled at 333 Hz and then recorded by a standalone recording unit. One geophone is directly installed on bedrock, the other one mounted on a 1-m boulder partially buried in colluvium. This latter sensor integrates a heavily instrumented cross-section consisting of a 225 cm2

  19. A six-circle diffractometer system for synchrotron X-ray studies of surfaces and thin film growth by molecular beam epitaxy

    International Nuclear Information System (INIS)

    A new ultrahigh vacuum (UHV) surface diffractometer system equipped with molecular beam epitaxy (MBE) capabilities has been developed. It has a versatile 6-circle configuration for defining the diffraction geometry, and a three-axis translation stage for controlling the sample position. Rugged mechanical components are employed in the design to allow accurate diffraction measurements. Sample cooling is facilitated by passing liquid nitrogen into a reservoir in the base of a sample mount. The sample can be heated to very high temperatures by either direct current heating or electron beam bombardment. During film growth and processing, the sample temperature, monitored by thermocouples, can be continuously and rapidly varied between ∼110 K to above room temperature. A charge coupled device (CCD) camera, attached to the μ circle, allows rapid reciprocal space mapping for real time studies of sample growth and evolution during deposition and annealing. A beam stop and a baffle are implemented to minimize stray scattered radiation

  20. The outcrop and area underlain by the Upper Cretaceous Drip Tank Mb. of the Straight Cliffs Fm. in the Kaiparowits Plateau study area, southern Utah (kaikdtg)

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This is a polygon file of the outcrop and area underlain by the Drip Tank Mb. of the Straight Cliffs Fm. (Upper Cretaceous) east of 112 degrees of longitude in the...

  1. Two personification strategies for solving circles packing problem

    Institute of Scientific and Technical Information of China (English)

    黄文奇[1; 许如初[2

    1999-01-01

    Two personification strategies are presented, which yield a highly efficient and practical algorithm for solving one of the NP hard problems——circles packing problem on the basis of the quasi-physical algorithm. A very clever polynomial time complexity degree approximate algorithm for solving this problem has been reported by Dorit S.Hochbaum and Wolfgang Maass in J. ACM. Their algorithm is extremely thorough-going and of great theoretical significance. But, just as they pointed out, their algorithm is feasible only in conception and even for examples frequently encountered in everyday life and of small scale, it is the case more often than not that up to a million years would be needed to perform calculations with this algorithm. It is suggested toward the end of their paper that a heuristic algorithm of higher practical effectiveness should be sought out. A direct response to their suggestion is intented to provide.

  2. The rotation of the Galaxy within the solar circle

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez, H.; May, J.; Bronfman, L. (Universidad de Chile, Santiago (Chile))

    1990-01-01

    A rotation curve for the Galaxy within the solar circle is found using data from the fourth Galactic quadrant. The observations are consistent with a picture in which the Galaxy rotates with a circular velocity of 209 + or - 2 km/s between Galactocentric distances of 0.24 and 1.0 solar radius. Clouds associated with a part of the Carina spiral arm exhibit an average rotation velocity 12 km/s higher than expected, implying an apparent anomalous motion. An excess in velocity of about the same magnitude observed at the tangent direction of the Centaurus arm is attributed to streaming and internal motions of large molecular complexes. Similar phenomena found in the Sagittarius and Scutum arms by northern observers strongly support the hypothesis that Carina is the continuation of the Sagittarius arm and Centaurus is that of the Scutum arm. 30 refs.

  3. Literature circles book club for science and language arts

    Science.gov (United States)

    Bombard, Britain

    Students from an urban middle school participated in a Science Book Club for one semester using the literature circles format. These students voluntarily attended twice weekly lunch meetings, reading books that followed their Grade 7 science classes. Groups of three to six participants read the same text, each performing rotating jobs to improve group discussions during meetings. When a group completed a book, participants created a presentation to share what they learned with the other groups in the club and the researcher/teacher. This research measured gains in science content knowledge and language arts skills focusing on reading comprehension, and literary response and analysis. Gains were measured using pre-existing district benchmarks. An ANCOVA showed that while no gains were found in science content knowledge, there were gains in language arts in the areas of reading comprehension and literary response and analysis.

  4. BOUNDARY INTEGRAL FORMULA OF ELASTIC PROBLEMS IN CIRCLE PLANE

    Institute of Scientific and Technical Information of China (English)

    DONG Zheng-zhu; LI Shun-cai; YU De-hao

    2005-01-01

    By bianalytic functions, the boundary integral formula of the stress function for the elastic problem in a circle plane is developed. But this integral formula includes a strongly singular integral and can not be directly calculated. After the stress function is expounded to Fourier series, making use of some formulas in generalized functions to the convolutions, the boundary integral formula which does not include strongly singular integral is derived further. Then the stress function can be got simply by the integration of the values of the stress function and its derivative on the boundary. Some examples are given. It shows that the boundary integral formula of the stress function for the elastic problem is convenient.

  5. Planar maps, circle patterns and 2d gravity

    CERN Document Server

    David, Francois

    2013-01-01

    Via circle pattern techniques, random planar triangulations (with angle variables) are mapped onto Delaunay triangulations in the complex plane. The uniform measure on triangulations is mapped onto a conformally invariant spatial point process. We show that this measure can be expressed as: (1) a sum over 3-spanning-trees partitions of the edges of the Delaunay triangulations; (2) the volume form of a K\\"ahler metric over the space of Delaunay triangulations, whose prepotential has a simple formulation in term of ideal tessellations of the 3d hyperbolic space; (3) a discretized version (involving finite difference complex derivative operators) of Polyakov's conformal Fadeev-Popov determinant in 2d gravity; (4) a combination of Chern classes, thus also establishing a link with topological 2d gravity.

  6. Minimalisasi Kekurangan Material Melalui Implementasi Quality Control Circle

    Directory of Open Access Journals (Sweden)

    Togar W. S. Panjaitan

    2011-01-01

    Full Text Available The revolution of traditional quality management concept into total quality management (TQM inspired industry for establishing and implementing quality control circle (QCC. Before starting a project as the implementation of the QCC, the training was held for supporting the knowledge of the QCC team. As the pilot project of the QCC, this research will try to minimize the percentage of the lack material in the production process of 8340 type by working together with the QCC team. The result of QCC implementation could reach the target set by the team, the percentage of the lack material reached less than 3%. The percentage of the lack material kontaktarm reduced from 3.09% to 0.00%, flachdrahtspule reduced from 9.20% to 0.40%, and niet reduced from 7.71% to 2.73%. Besides, the implementation of QCC also resulted in positive impact for all the members of the team about the benefits and experiences gained.

  7. No evidence for anomalously low variance circles on the sky

    CERN Document Server

    Moss, Adam; Zibin, James P

    2010-01-01

    In a recent paper, Gurzadyan & Penrose claim to have found directions on the sky centred on which are circles of anomalously low variance in the cosmic microwave background (CMB). These features are presented as evidence for a particular picture of the very early Universe. We attempted to repeat the analysis of these authors, and we can indeed confirm that such variations do exist in the temperature variance for annuli around points in the data. However, we find that this variation is entirely expected in a sky which contains the usual CMB anisotropies. In other words, properly simulated Gaussian CMB data contain just the sorts of variations claimed. Gurzadyan & Penrose have not found evidence for pre-Big Bang phenomena, but have simply re-discovered that the CMB contains structure.

  8. Periodic orbits of circle homeomorphisms with a break point

    International Nuclear Information System (INIS)

    Let fθ(x) = F0(x) + θ (mod1), x is an element of S1 , θ is an element of [0,1] be a family of preserving orientation circle homeomorphisms with a single break point xb, i.e. with a jump in the first derivative F0 at the point x = xb. Suppose that F'0(x) is absolutely continuous on [xb, xb +1] and F''0(x) is an element of Lα([0,1]) for some α> 1. Consider fθ with rational rotation number ρθ = p/q of rank n, i.e. p/q = [k1, k2, ...,kn]. We prove that for sufficiently large n, the homeomorphism fθ has either a unique periodic orbit of period q or two periodic orbits of period q. Also the renormalization behaviour of fθ with rational rotation number p ρθ = p/q is studied. (author)

  9. G2 cubic transition between two circles with shape control

    Science.gov (United States)

    Habib, Zulfiqar; Sakai, Manabu

    2009-01-01

    This paper describes a method for joining two circles with an S-shaped or with a broken back C-shaped transition curve, composed of at most two spiral segments. In highway and railway route design or car-like robot path planning, it is often desirable to have such a transition. It is shown that a single cubic curve can be used for blending or for a transition curve preserving G2 continuity with local shape control parameter and more flexible constraints. Provision of the shape parameter and flexibility provide freedom to modify the shape in a stable manner which is an advantage over previous work by Meek, Walton, Sakai and Habib.

  10. Landslides: Geomorphology and Sea Cliff Hazard Potential, Santa Barbara - Isla Vista, California J.F. Klath and E.A. Keller

    Science.gov (United States)

    Klath, J. F.; Keller, E. A.

    2015-12-01

    Coastal areas are often characterized by high population densities in an ever changing, dynamic environment. The world's coasts are often dominated by steeply sloping sea cliffs, the morphology of which reflects rock type, wave erosion, and surface erosion, as well as human activities such changing vegetation, urban runoff, and construction of coastal defenses. The Santa Barbara and Goleta area, with over 17 km of sea cliffs and beaches, extends from Santa Barbara Point west to the hamlet of Isla Vista. A deeper understanding of the local geology and the physical processes generating slope failure and, thus, landward cliff retreat is important for general public safety, as well as future development and planning. Our research objective includes assessment of landslide hazard potential through investigation of previous landslides and how these events relate to various physical variables and characteristics within the surrounding bedrock. How does landslide frequency, volume, and type relate to varying local bedrock and structure? Two geologic formations dominate the sea cliffs of the Santa Barbara area: Monterey shale (upper, middle, and lower) and Monterey Sisquoc shale. Geology varies from hard cemented shale and diatomaceous, low specific gravity shale to compaction shale. Variations in landslide characteristics are linked closely to the geology of a specific site that affects how easily rock units are weathered and eroded by wave erosion, naturally occurring oil and water seeps, burnt shale events, and landslide type and frequency on steeply dipped bedding planes/daylighting beds. Naturally occurring features linked to human processes often weaken bedrock and, thus, increase the likelihood of landslides. We categorize landslide frequency, type, and triggers; location of beach access, drainage pipes, and water; and oil and tar seeps in order to develop suggestions to minimize landslide potential. Lastly, using previously published erosion cliff retreat rates and

  11. Detection probability of cliff-nesting raptors during helicopter and fixed-wing aircraft surveys in western Alaska

    Science.gov (United States)

    Booms, T.L.; Schempf, P.F.; McCaffery, B.J.; Lindberg, M.S.; Fuller, M.R.

    2010-01-01

    We conducted repeated aerial surveys for breeding cliff-nesting raptors on the Yukon Delta National Wildlife Refuge (YDNWR) in western Alaska to estimate detection probabilities of Gyrfalcons (Falco rusticolus), Golden Eagles (Aquila chrysaetos), Rough-legged Hawks (Buteo lagopus), and also Common Ravens (Corvus corax). Using the program PRESENCE, we modeled detection histories of each species based on single species occupancy modeling. We used different observers during four helicopter replicate surveys in the Kilbuck Mountains and five fixed-wing replicate surveys in the Ingakslugwat Hills near Bethel, AK. During helicopter surveys, Gyrfalcons had the highest detection probability estimate (p^;p^ 0.79; SE 0.05), followed by Golden Eagles (p^=0.68; SE 0.05), Common Ravens (p^=0.45; SE 0.17), and Rough-legged Hawks (p^=0.10; SE 0.11). Detection probabilities from fixed-wing aircraft in the Ingakslugwat Hills were similar to those from the helicopter in the Kilbuck Mountains for Gyrfalcons and Golden Eagles, but were higher for Common Ravens (p^=0.85; SE 0.06) and Rough-legged Hawks (p^=0.42; SE 0.07). Fixed-wing aircraft provided detection probability estimates and SEs in the Ingakslugwat Hills similar to or better than those from helicopter surveys in the Kilbucks and should be considered for future cliff-nesting raptor surveys where safe, low-altitude flight is possible. Overall, detection probability varied by observer experience and in some cases, by study area/aircraft type.

  12. Migraine without aura is not associated with incomplete circle of Willis

    DEFF Research Database (Denmark)

    Ezzatian-Ahar, Shabnam; Amin, Faisal Mohammad; Obaid, Hayder Ghani;

    2014-01-01

    the prevalence of incomplete circle of Willis in migraineurs and controls. In the present study we compared the prevalence of incomplete circle of Willis in female migraine patients without aura to female healthy non-migraine controls.Using 3-Tesla magnetic resonance angiography we recorded three...

  13. On the Existence of Periodic Orbits for the Fixed Homogeneous Circle Problem

    OpenAIRE

    Azevedo, C.; Ontaneda, P.

    2005-01-01

    We prove the existence of some types of periodic orbits for a particle moving in Euclidean three-space under the influence of the gravitational force induced by a fixed homogeneous circle. These types include periodic orbits very far and very near the homogeneous circle, as well as eight and spiral periodic orbits.

  14. Providing a Full Circle of Support to Teachers in an Inclusive Elementary School

    Science.gov (United States)

    Waldron, Nancy L.; Redd, Lacy

    2011-01-01

    Providing a full circle of support to teachers in an inclusive elementary school, the Newberry Elementary School (NES) principal and staff have worked for 5 years to ensure the inclusion of students with disabilities in general education classrooms. The authors would like to share their perceptions of how this full circle (the multiple systems) of…

  15. RiemCirc: A Generator of Nodes and Weights for Riemann Integration on the Circle

    CERN Document Server

    Mathar, Richard J

    2011-01-01

    RiemCirc is a C++ program which allocates points inside the unit circle for numerical quadrature on the circle, aiming at homogeneous equidistant distribution. The weights of the quadrature rule are computed by the area of the tiles that surround these nodes. The shapes of the areas are polygonal, defined by Voronoi tessellation.

  16. Table or Circles: A Comparison of Two Methods for Choosing among Career Alternatives

    Science.gov (United States)

    Amit, Adi; Gati, Itamar

    2013-01-01

    A sample of 182 young adults about to choose their college major were randomly assigned to 2 guidance methods aimed at facilitating choosing among promising career alternatives: Table-for-Choice and Circles-for-Choice. Table-for-Choice was perceived as more effective, but individuals' confidence in their choice was higher in the Circles-for-Choice…

  17. Systematic comparison of the use of annular and Zernike circle polynomials for annular wavefronts

    NARCIS (Netherlands)

    Mahajan, V.N.; Aftab, M.

    2010-01-01

    The theory of wavefront analysis of a noncircular wavefront is given and applied for a systematic comparison of the use of annular and Zernike circle polynomials for the analysis of an annular wavefront. It is shown that, unlike the annular coefficients, the circle coefficients generally change as t

  18. Employer-employee based quality circles in Japan: human resource policy implications for American firms.

    Science.gov (United States)

    Munchus, G

    1983-04-01

    This paper traces the development of the quality circle in Japan with reference to such traditions as permanent employment, nenko (seniority-based compensation), enterprise unionism, and management paternalism. Quality circles are examined as tools for motivating employees, reducing labor turnover, effecting employee "career expansion," and allowing employee participation in job redesign. PMID:10263059

  19. A surface containing a line and a circle through each point is a quadric

    KAUST Repository

    Nilov, Fedor K.

    2012-06-20

    We prove that a surface in 3-dimensional Euclidean space containing a line and a circle through each point is a quadric. We also give some particular results on the classification of surfaces containing several circles through each point. © 2012 Springer Science+Business Media B.V.

  20. Evaluation for the minimum circumscribed circle based on the rotation method

    International Nuclear Information System (INIS)

    This note presents a novel search algorithm for construction of the alpha hull to determine the minimum circumscribed circle. The candidate points of the minimum circumscribed circle can be obtained based on the rotation method under a known radius. Several examples have been used to validate the effectiveness of the proposed algorithm. (technical design note)

  1. A Variant of K-Theory and Topological T-Duality for Real Circle Bundles

    Science.gov (United States)

    Gomi, Kiyonori

    2015-03-01

    For a space with involutive action, there is a variant of K-theory. Motivated by T-duality in type II orbifold string theory, we establish that a twisted version of the variant enjoys a topological T-duality for Real circle bundles, i.e., circle bundles with real structure.

  2. When Two Circles Determine a Triangle. Discovering and Proving a Geometrical Condition in a Computer Environment

    Science.gov (United States)

    Metaxas, Nikolaos; Karagiannidou, Andromachi

    2010-01-01

    Visualization of mathematical relationships enables students to formulate conjectures as well as to search for mathematical arguments to support these conjectures. In this project students are asked to discover the sufficient and necessary condition so that two circles form the circumscribed and inscribed circle of a triangle and investigate how…

  3. Comparing Interactions in Literature Circles in Both Online and in Class Discussions

    Science.gov (United States)

    Skeen, Christel Ghrist

    2014-01-01

    Discourse analysis of literature circles can lead educators to understand the different types of interactions taking place as students talk about text. Social and academic interactions exist in both face-to-face and online discussions of reading material. This study examines two different settings of literature circles and compares interactions of…

  4. An Action Research Study Involving Motivating Middle School Students' Learning through Online Literature Circles

    Science.gov (United States)

    Falter Thomas, Angela

    2014-01-01

    In this study, I explored the motivation of middle school students participating in online literature circles facilitated by college students, compared to traditional face-to-face literature circles they previously utilized. Sixty-eight rural, middle school students from two English teachers' classrooms took part in two sets of online literature…

  5. Diurnal and annual variations of meteor rates at the arctic circle

    Directory of Open Access Journals (Sweden)

    W. Singer

    2004-01-01

    Full Text Available Meteors are an important source for (a the metal atoms of the upper atmosphere metal layers and (b for condensation nuclei, the existence of which are a prerequisite for the formation of noctilucent cloud particles in the polar mesopause region. For a better understanding of these phenomena, it would be helpful to know accurately the annual and diurnal variations of meteor rates. So far, these rates have been little studied at polar latitudes. Therefore we have used the 33 MHz meteor radar of the ALOMAR observatory at 69° N to measure the meteor rates at this location for two full annual cycles. This site, being within 3° of the Arctic circle, offers in addition an interesting capability: The axis of its antenna field points (almost towards the North ecliptic pole once each day of the year. In this particular viewing direction, the radar monitors the meteoroid influx from (almost the entire ecliptic Northern hemisphere. We report on the observed diurnal variations (averaged over one month of meteor rates and their significant alterations throughout the year. The ratio of maximum over minimum meteor rates throughout one diurnal cycle is in January and February about 5, from April through December 2.3±0.3. If compared with similar measurements at mid-latitudes, our expectation, that the amplitude of the diurnal variation is to decrease towards the North pole, is not really borne out. Observations with the antenna axis pointing towards the North ecliptic pole showed that the rate of deposition of meteoric dust is substantially larger during the Arctic NLC season than the annual mean deposition rate. The daylight meteor showers of the Arietids, Zeta Perseids, and Beta Taurids supposedly contribute considerably to the June maximum of meteor rates. We note, though, that with the radar antenna pointing as described above, all three meteor radiants are close to the local horizon but all three radiants were detected.

  6. A new method for fast circle detection in a complex background image

    Science.gov (United States)

    Wu, Meijun; Yang, Jie; Sun, Yadong

    2011-11-01

    A new method for circle detection, Hough gradient clustering method, has been developed in this paper. By using gradient direction angle to find the diameter of a circle, the new method can rapidly detect the circle in a complex background. The crucial steps in this method are the feature extraction and the clustering of the points which have the same gray direction angle and are collinear along the gradient direction. The application of the two-to-one space mapping and 1-2Hough transform can further reduce the useless calculation in the process of circle detection. Comparing with the Hough gradient method in OpenCV, the newly developed method shows a higher efficiency of circle detection in a complex background image as well as a great improvement in the anti-noise ability.

  7. SusCa circles to activate catering services in the public sector in local and organic food procurement

    OpenAIRE

    Muukka, Eija

    2009-01-01

    SusCa circles working for promoting sustainable foodstuff procurement are starting operations all around Finland. SusCa circles are part of EkoCentria's Sustainable Catering in Public Services project.

  8. The role of Circle women in curbing violence against women and girls in Africa

    Directory of Open Access Journals (Sweden)

    Sylvia Owusu-Ansah

    2016-07-01

    Full Text Available The article looks at the role Circle of Concerned African Women Theologians (the Circle have played in the struggle to end or reduce the rate at which violence against women and girls occurs in West Africa by highlighting the contributions of older Circle women, especially the initiator of the Circle, Mercy Amba Oduyoye. The initiator of the Circle and other older Circle women have left a remarkable legacy that needs to continue by the current and future generations of the Circle. The background information examines the leadership and mentorship of Mercy Amba Oduyoye and the impact she has made in the lives of African women. The essay then looks at the types of violence that women face in West Africa with the specific contributions of Circle women in the struggle to end violence against women and girls. It then argues that Circle women have played very significant roles both in setting the pace and giving the platform for women activities to minimise gender-based violence against women and girls. Circle women have written and presented papers that have addressed many challenges including HIV and/or AIDS, Girl Child trafficking, Marriage of Minors, and almost all kinds of violence against women and girls. Currently, religious violence threatens the fabric of African nations causing insecurity and panic, women and girls being the most vulnerable. The challenge to the present and future Circle members is to contribute in significant ways towards religious harmony in Africa and beyond. The Circle acknowledges the leadership role of women and encourages them to spearhead the liberation of women as well as empower them to be able to aspire to get to the top or become independent. No one understands what someone else feels better than the person experiencing the ordeal. Women can better understand what they go through and also have the passion to strive towards liberation.Intradisciplinary and/or interdisciplinary implications: In this article, the

  9. Kinetics of the forelimb in horses circling on different ground surfaces at the trot.

    Science.gov (United States)

    Chateau, Henry; Camus, Mathieu; Holden-Douilly, Laurène; Falala, Sylvain; Ravary, Bérangère; Vergari, Claudio; Lepley, Justine; Denoix, Jean-Marie; Pourcelot, Philippe; Crevier-Denoix, Nathalie

    2013-12-01

    Circling increases the expression of distal forelimb lameness in the horse, depending on rein, diameter and surface properties of the circle. However, there is limited information about the kinetics of horses trotting on circles. The aim of this study was to quantify ground reaction force (GRF) and moments in the inside and outside forelimb of horses trotting on circles and to compare the results obtained on different ground surfaces. The right front hoof of six horses was equipped with a dynamometric horseshoe, allowing the measurement of 3-dimensional GRF, moments and trajectory of the centre of pressure. The horses were lunged at slow trot (3 m/s) on right and left 4 m radius circles on asphalt and on a fibre sand surface. During circling, the inside forelimb produced a smaller peak vertical force and the stance phase was longer in comparison with the outside forelimb. Both right and left circling produced a substantial transversal force directed outwards. On a soft surface (sand fibre), the peak transversal force and moments around the longitudinal and vertical axes of the hoof were significantly decreased in comparison with a hard surface (asphalt). Sinking of the lateral or medial part of the hoof in a more compliant surface enables reallocation of part of the transversal force into a proximo-distal force, aligned with the limb axis, thus limiting extrasagittal stress on the joints. PMID:24511634

  10. Discovery of an Equilibrium Circle in the Circular Restricted Three Body Problem

    Directory of Open Access Journals (Sweden)

    Fawzy A. Abd El-Salam

    2012-01-01

    Full Text Available Problem statement: A traial to find equilibrium points in out of plane of the restricted three body problem. Approach: Solution of the equations of motion at equilibrium points. Linearizing the equations of motion and computing the eigen values to investigate the stability. Results: New triangular equilibrium points in plane perpendicular to the plane of motion and passing through Lagrange triangular equilibrium points are obtained. A circle of equilibrium points, namely Fawzy equilibrium circle is discovered. Infinite number of equilibrium points located on the circumference of this circle are computed. The obtained solutions are checked via obtaining some special cases. The stability of Fawzy equilibrium circle is studied. The oscillatory stable solutions as η-dependent and ξ-dependent stabilities are derived. Conclusion: The equilibrium points in out of plane of motion of the restricted three body problem is investigated. We obtained the following very new results:- First we obtained Fawzy ξξ-triangular equilibrium points in the plane η = 0. Second we obtained the so called Fawzy equilibrium circle. We checked our solutions via obtaining some special cases. We studied the stability of Fawzy equilibrium circle. We derived the oscillatory stable solutions as η-dependent and ξ-dependent stabilities. The stability of Lagrange as well as Fawzy triangular equilibrium points followed directly because they are subsets of the Fawzy equilibrium circle.

  11. Vienna Circle and Logical Analysis of Relativity Theory

    CERN Document Server

    Andréka, H; Németi, I; Németi, P; Székely, G

    2011-01-01

    In this paper we present some of our school's results in the area of building up relativity theory (RT) as a hierarchy of theories in the sense of logic. We use plain first-order logic (FOL) as in the foundation of mathematics (FOM) and we build on experience gained in FOM. The main aims of our school are the following: We want to base the theory on simple, unambiguous axioms with clear meanings. It should be absolutely understandable for any reader what the axioms say and the reader can decide about each axiom whether he likes it. The theory should be built up from these axioms in a straightforward, logical manner. We want to provide an analysis of the logical structure of the theory. We investigate which axioms are needed for which predictions of RT. We want to make RT more transparent logically, easier to understand, easier to change, modular, and easier to teach. We want to obtain deeper understanding of RT. Our work can be considered as a case-study showing that the Vienna Circle's (VC) approach to doing...

  12. Taking a literature circles approach to teach Academic English

    Directory of Open Access Journals (Sweden)

    Graham-Marr Alastair

    2016-01-01

    Full Text Available Literature circles (LC, an activity framework for classroom discussion, has been adapted for EFL classes to help students engage more deeply with reading texts. In this approach, students read texts outside of class, and discuss the texts in class, using a specified discussion framework. Originally developed for L1 classes as a tool for teaching literature, LC has been adapted for EFL classes, not only to help develop reading skills, but also to help students develop their discussion skills. However, to date, many adaptations of LC have relied on graded fiction as source material, which is not always appropriate for tertiary education. Feeling pressure to match course content with the labour market needs of our contemporary global society, English departments are increasingly being asked to include more academic content in their classes. This requires that non-fiction be used as source material. This preliminary study examines student perceptions of an LC class using non-fiction as source material. The subjects of this short, qualitative, pilot study were engineering students at a university in Japan. Procedures of the class and the issues that emerged are discussed.

  13. End of the line to build a circle

    CERN Multimedia

    2006-01-01

    The installation of the cryogenic distribution line in the LHC tunnel is finally finished! All the sectors have undergone pressure and helium leak tests at room temperature, and one complete sector was cold tested in cryogenic conditions. Some of the QRL team in UJ22 of the LHC tunnel, where the last sector of the cryogenic distribution line was installed.It must have been a joyous moment in UJ22 of the LHC tunnel (near Point 2, Saint Genis Pouilly) on 19 October. This was where the last external weld of the cryogenic distribution line, also known as QRL, was made, thus completing the full distribution ring. The QRL is a circle built in 8 sectors, each approximately 3 km in length. It will circulate helium in liquid and gas phases, at different temperatures and pressures, to provide the cryogenic conditions for the superconducting magnets in the LHC tunnel. The last sector installed (sector 1-2) passed the pressure and helium leak tests at room temperature on 28 October. As part of the warm test, each sector...

  14. Viroid Replication: Rolling-Circles, Enzymes and Ribozymes

    Directory of Open Access Journals (Sweden)

    Marcos De la Peña

    2009-09-01

    Full Text Available Viroids, due to their small size and lack of protein-coding capacity, must rely essentially on their hosts for replication. Intriguingly, viroids have evolved the ability to replicate in two cellular organella, the nucleus (family Pospiviroidae and the chloroplast (family Avsunviroidae. Viroid replication proceeds through an RNA-based rolling-circle mechanism with three steps that, with some variations, operate in both polarity strands: i synthesis of longer-than-unit strands catalyzed by either the nuclear RNA polymerase II or a nuclear-encoded chloroplastic RNA polymerase, in both instances redirected to transcribe RNA templates, ii cleavage to unit-length, which in the family Avsunviroidae is mediated by hammerhead ribozymes embedded in both polarity strands, while in the family Pospiviroidae the oligomeric RNAs provide the proper conformation but not the catalytic activity, and iii circularization. The host RNA polymerases, most likely assisted by additional host proteins, start transcription from specific sites, thus implying the existence of viroid promoters. Cleavage and ligation in the family Pospiviroidae is probably catalyzed by an RNase III-like enzyme and an RNA ligase able to circularize the resulting 5’ and 3’ termini. Whether a chloroplastic RNA ligase mediates circularization in the family Avsunviroidae, or this reaction is autocatalytic, remains an open issue.

  15. Complex velocity potential for an ellipse and a circle in translation and rotation

    Science.gov (United States)

    Sun, R.; Chwang, A. T.

    1997-12-01

    This paper investigates the analytical solutions of two-dimensional Neumann-type external boundary-value problem for an ellipse and a circle in complex analysis treatment. The transformation of harmonics between two planes is expanded in Laurent series. The circle theorem is extended so as to suit to the system of the ellipse and the circle. By means of Basset's process, the harmonic expressions of the system are found in the form of recurrence formulae which are suitable for numerical computations. The complex velocity potential of the system in translation and rotation is represented by the summation of the harmonic expressions.

  16. 17th century arguments for the impossibility of the indefinite and the definite circle quadrature

    DEFF Research Database (Denmark)

    Lützen, Jesper

    2014-01-01

    statements related to the quadrature of the circle. In this paper the impossibility arguments put forward by Wallis, Gregory, Leibniz and Newton are analyzed and the controversies they gave rise to are discussed. They all deal with the impossibility of finding an algebraic expression of the area of a sector...... of a circle in terms of its radius and cord, or of the area of the entire circle. It is argued that the controversies were partly due to a lack of precision in the formulation of the results. The impossibility results were all part of a constructive problem solving mathematical enterprise. They were...

  17. Accurate 3D point cloud comparison and volumetric change analysis of Terrestrial Laser Scan data in a hard rock coastal cliff environment

    Science.gov (United States)

    Earlie, C. S.; Masselink, G.; Russell, P.; Shail, R.; Kingston, K.

    2013-12-01

    Our understanding of the evolution of hard rock coastlines is limited due to the episodic nature and ';slow' rate at which changes occur. High-resolution surveying techniques, such as Terrestrial Laser Scanning (TLS), have just begun to be adopted as a method of obtaining detailed point cloud data to monitor topographical changes over short periods of time (weeks to months). However, the difficulties involved in comparing consecutive point cloud data sets in a complex three-dimensional plane, such as occlusion due to surface roughness and positioning of data capture point as a result of a consistently changing environment (a beach profile), mean that comparing data sets can lead to errors in the region of 10 - 20 cm. Meshing techniques are often used for point cloud data analysis for simple surfaces, but in surfaces such as rocky cliff faces, this technique has been found to be ineffective. Recession rates of hard rock coastlines in the UK are typically determined using aerial photography or airborne LiDAR data, yet the detail of the important changes occurring to the cliff face and toe are missed using such techniques. In this study we apply an algorithm (M3C2 - Multiscale Model to Model Cloud Comparison), initially developed for analysing fluvial morphological change, that directly compares point to point cloud data using surface normals that are consistent with surface roughness and measure the change that occurs along the normal direction (Lague et al., 2013). The surfaces changes are analysed using a set of user defined scales based on surface roughness and registration error. Once the correct parameters are defined, the volumetric cliff face changes are calculated by integrating the mean distance between the point clouds. The analysis has been undertaken at two hard rock sites identified for their active erosion located on the UK's south west peninsular at Porthleven in south west Cornwall and Godrevy in north Cornwall. Alongside TLS point cloud data, in

  18. A Comparison Of The Wind Spectrum According To Different Methods - An Original Project Of A Building On A Cliff In Gdynia

    Directory of Open Access Journals (Sweden)

    Zielińska M.

    2015-08-01

    Full Text Available The article presents numerical simulations of the dynamic wind loads on the structure of a building designed on a cliff in Gdynia. The results obtained from the two methods: Davenport’s and Karman’s are compared. The results allowed a comparison of the two methods, and they provided an answer to the question how a construction, designed in such an unusual condition of a cliff behaves under the influence of the gusting wind. The wind spectrum is presented and compared in both directions: of the X-axis and of the Y-axis. The dynamic calculations are carried out in the Abaqus software. The conducted numerical analyses compare the displacements in two points - at half height of the building and at the top - obtained by the two methods.

  19. Geologic Provinces of the Circum-Arctic, 2008 (north of the Arctic Circle)

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This shapefile includes arcs and polygons that describe U.S. Geological Survey defined 33 geologic provinces of the Circum-Arctic (north of the Arctic Circle). Each...

  20. Introduction of the carbon dioxide absorption method with closed circle breathing into anesthesia practice.

    Science.gov (United States)

    Foregger, R

    2000-07-01

    The circle breathing CO2 absorption system for use during acetylene anesthesia was described by Carl Gauss in 1924/1925. The apparatus was manufactured by Drägerwerk of Lübeck. A considerable number of publications on the apparatus employing the closed circle method of CO2 absorption appeared in the medical press soon thereafter. Later apparatus models, also built by Drägerwerk, were adapted for nitrous oxide-oxygen-ether anesthesia and introduced into practice by Paul Sudeck and Helmut Schmidt. Information about all this was transmitted to America through the German medical press, including the Draeger-Hefte. American anesthesia machine manufacturers began to develop closed circle CO2 absorbers several years later. Claims that the circle breathing CO2 absorption method was introduced into anesthesia practice by Brian Sword are not valid. PMID:10969391

  1. Monitoring debris flow induced channel morphodynamics with terrestrial laser scanning, Chalk Cliffs, CO (Invited)

    Science.gov (United States)

    Wasklewicz, T. A.; Staley, D. M.

    2010-12-01

    between the magnitude of erosion and deposition magnitudes yielded no strong correlations with channel morphometry measures. This would indicate channel point- and reach-scale cannot be used to adequately predict erosion and deposition. Instead, a combination of high-resolution topographic changes and process information from in-situ measurements of flow dynamics are necessary to capture channel morphodynamics in coupled hillslope-channel streams.

  2. Think crisis-think female: the glass cliff and contextual variation in the think manager-think male stereotype.

    Science.gov (United States)

    Ryan, Michelle K; Haslam, S Alexander; Hersby, Mette D; Bongiorno, Renata

    2011-05-01

    The "think manager-think male" (TMTM) association underlies many gender inequalities in the workplace. However, research into the "glass cliff" has demonstrated that the suitability of male and female managers varies as a function of company performance such that in times of poor performance people may "think female" (Ryan & Haslam, 2005, 2007). Three studies examined gender and managerial stereotypes in the context of companies that are doing well or doing badly. Study 1 reproduced TMTM associations for descriptions of managers of successful companies but demonstrated a reversal for managers of unsuccessful companies. Study 2 examined the prescriptive nature of these stereotypes. No TMTM relationship was found for ideal managers of successful companies, but ideal managers of unsuccessful companies were associated with the female stereotype. Study 3 suggested that women may be favored in times of poor performance, not because they are expected to improve the situation, but because they are seen to be good people managers and can take the blame for organizational failure. Together, the studies illustrate the importance of context as a moderator of the TMTM association. Practical and theoretical implications for gender discrimination in the workplace are discussed. PMID:21171729

  3. Progressive Nostalgia: Alfred Stieglitz, his Circle and the Romantic Anti-Capitalist Critique of Modernity

    OpenAIRE

    Berger, C. A.

    2014-01-01

    This thesis examines the involvement of Alfred Stieglitz – photographer, editor, art collector, impresario, talker – and his circle in the development of American modernism in the first three decades of the twentieth century. Through the analysis of photographs and artworks in other media by the Stieglitz group, the journal Camera Work, the gallery 291, a vast correspondence and art theory, criticism and social thought of the period, Stieglitz and his circle are situated in the context of an ...

  4. Detection of HIV cDNA Point Mutations with Rolling-Circle Amplification Arrays

    OpenAIRE

    Zhongwei Wu; Zuhong Lu; Quanjun Liu; Lingwei Wu

    2010-01-01

    In this paper we describe an isothermal rolling-circle amplification (RCA) protocol to detect gene point mutations on chips. The method is based on an allele-specific oligonucleotide circularization mediated by a special DNA ligase. The probe is circularized when perfect complementary sequences between the probe oligonucleotide and HIV cDNA gene. Mismatches around the ligation site can prevent probe circularization. The circularized probe (C-probe) can be amplified by rolling circle amplifica...

  5. The Arithmetic of Elliptic Fibrations in Gauge Theories on a Circle

    OpenAIRE

    Grimm, Thomas W.; Kapfer, Andreas; Klevers, Denis

    2015-01-01

    The geometry of elliptic fibrations translates to the physics of gauge theories in F-theory. We systematically develop the dictionary between arithmetic structures on elliptic curves as well as desingularized elliptic fibrations and symmetries of gauge theories on a circle. We show that the Mordell-Weil group law matches integral large gauge transformations around the circle in Abelian gauge theories and explain the significance of Mordell-Weil torsion in this context. We also use Higgs trans...

  6. A New Archaeoastronomical Investigation of the Irish Axial-Stone Circles

    OpenAIRE

    Prendergast, Frank T.; Ruggles, Clive L.

    1996-01-01

    This paper presents the preliminary results of a project undertaken in 1994 to investigate the astronomical potential of the axial-stone circles (ASCs) of seven or more stones in Counties Cork and Kerry, south-west Ireland. This group of sites is of particular interest in that the monuments in the group bear a striking resemblance to the recumbent stone circles (RSCs) of Aberdeenshire, eastern Scotland, which appear to exhibit a strong pattern of alignment in relation to prominent hilltop sum...

  7. Discriminants and functional equations for polynomials orthogonal on the unit circle

    International Nuclear Information System (INIS)

    We derive raising and lowering operators for orthogonal polynomials on the unit circle and find second order differential and q-difference equations for these polynomials. A general functional equation is found which allows one to relate the zeros of the orthogonal polynomials to the stationary values of an explicit quasi-energy and implies recurrences on the orthogonal polynomial coefficients. We also evaluate the discriminants and quantized discriminants of polynomials orthogonal on the unit circle

  8. Interference of guiding polariton mode in "traffic" circle waveguides composed of dielectric spherical particles

    OpenAIRE

    Polishchuk, I. Ya.; Gozman, M. I.; Blaustein, G. S.; Burin, A. L.

    2008-01-01

    The interference of polariton guiding modes propagating through "traffic circle" waveguides composed of dielectric spherical particles is investigated. The dependence of intensity of the wave on the position of the particle was studied using the multisphere the Mie scattering formalism. We show that if the frequency of light belongs to the passband of the waveguide, electromagnetic waves may be considered as two optical beams running along a circle in opposite directions and interfering with ...

  9. Local Circles in a Circular Economy – the Case of Smartphone Repair in Denmark

    OpenAIRE

    Henrik Riisgaard; Mette Mosgaard; Kristina Overgaard Zacho

    2016-01-01

    Abstract Circular economy has gained increasing attention the last decade, and more often the main focus is on the large  global circles addressing recycling of materials rather than the “inner circles” that address maintenance/repair and reuse. In this article we investigate one such inner circle ofthe circular economy namely repair of smartphones which extends the lifetime of products and adds to a local economy. Local repair of smartphones has increased in the resent years in Denmark. Thes...

  10. Diurnal and annual variations of meteor rates at the Arctic circle

    Directory of Open Access Journals (Sweden)

    W. Singer

    2004-01-01

    Full Text Available Meteors are an important source for (a the metal atoms of the upper atmosphere metal layers and (b for condensation nuclei, the existence of which are a prerequisite for the formation of noctilucent cloud particles in the polar mesopause region. For a better understanding of these phenomena, it would be helpful to know accurately the annual and diurnal variations of meteor rates. So far, these rates have been little studied at polar latitudes. Therefore we have used the 33 MHz meteor radar of the ALOMAR observatory at 69° N to measure the meteor rates at this location for two full annual cycles. This site, being within 3° of the Arctic circle, offers in addition an interesting capability: The axis of its antenna field points (almost towards the North ecliptic pole once each day of the year. In this particular viewing direction, the radar monitors the meteoroid influx from (almost the entire ecliptic Northern hemisphere.

    We report on the observed diurnal variations (averaged over one month of meteor rates and their significant alterations throughout the year. The ratio of maximum over minimum meteor rates throughout one diurnal cycle is in January and February about 5, from April through December 2.3±0.3. If compared with similar measurements at mid-latitudes, our expectation, that the amplitude of the diurnal variation is to decrease towards the North pole, is not really borne out.

    Observations with the antenna axis pointing towards the North ecliptic pole showed that the rate of deposition of meteoric dust is substantially larger during the Arctic NLC season than the annual mean deposition rate. The daylight meteor showers of the Arietids, Zeta Perseids, and Beta Taurids supposedly contribute considerably to the June maximum of meteor rates. We note, though, that with the radar antenna pointing as described above, all three meteor radiants are close to the local horizon. This radiant location should cause most of these

  11. Introspection, empathy, and the semi-circle of mental health.

    Science.gov (United States)

    Kohut, H

    1982-01-01

    Written shortly before his death, Heinz Kohut's last paper opens with a discussion of the paper 'Introspection, empathy, and psychoanalysis', written in 1959, which he presented at the Twenty-fifth Anniversary Meeting of the Chicago Institute for Psychoanalysis. In his first essay on the role of empathy in psychoanalysis, an essay that according to Kohut provided a foundation for many of his subsequent investigations in the field of depth psychology, he advanced the thesis that the introspective-empathic stance of the observer defines the science of psychoanalysis. The author explains that he was moved to propose this operational definition of psychoanalysis twenty-five years before because he felt that the introduction of the psychobiological concept of the drives (as well as various social psychological concepts) had not led to a true integration of psychoanalysis with biology or medicine but to a psychological and moral view of 'Guilty Man' that worked to distort the analyst's perception in the clinical and applied field. Kohut asserts that by defining itself operationally, psychoanalysis can accept itself as psychology, a psychology that studies man in terms of a self attempting to realize the programme laid down in his depth during the span of his life. The final section of the paper is devoted to a re-examination of man's intergenerational relationships in light of the shift Kohut advocates from psychobiology to psychology. The Oedipus complex is not to be understood as the end product of the uninfluentiable conflict of basic opposing instincts but as the result of interferences that impinge on man's development. Acknowledging the mythic power of Freud's formulation of the Oedipus complex, the author offers a dose of mythical counter-magic (to which the 'semi-circle of mental health' in the paper's title refers) and a re-interpretation of the story of King Oedipus. Kohut believes that the essence of human experience is not to be found in the biologically

  12. Safety, dose optimisation and security: the quadrature of the circle

    International Nuclear Information System (INIS)

    The growing concern for potential terrorist acts has lead to a number of new ideas about storing radiological and nuclear materials that are not always compatible with existing practices or infrastructures. This is valid in routine circumstances, but especially poses problems in case of accidents. As such, the management of nuclear safety, radiological protection and security within an evolving world such as a nuclear research centre sometimes looks like implementing the quadrature of the circle. International guidance exists, but is not always easily converted into an adequate policy comprehensible to all levels in a plant, from management to the work floor. Some examples. 1. infrastructure related problems: from a security point of view, fuels are better stored in the heart of a protected zone, while in case of criticality, fire... a more peripheral location is appropriate. 2. Safety related problems: Protection infrastructure may lead to difficulties of evacuation in case of emergencies; access limitations may be a burden in the management of safety interventions, maintenance... 3. Administrative contradictions: inventories of fuel storages and high active sealed sources are a cornerstone of inspections and verifications; yet, this information is a treasure for terrorists aiming at actions to obtain special materials. 4. Dose management: measures taken to secure sources may lead to a dose increase (e.g. labelling of old sources). However, the main difficulty is related to the 'cultural' aspect. There are synergies between safety culture, 'ALARA' culture and security culture. An individual aspect of desirable behaviour (e.g. questioning attitude), complemented with an organisational dimension (e.g. training, raising awareness) are obviously common. The objective is also in line: to avoid reduction of well-being of people, to protect the environment, to prevent damage to facilities. The main difficulties arise however because of the fundamental differences being

  13. Anatomical variations of the circle of Willis and cerebrovascular accidents in transitional Albania

    Directory of Open Access Journals (Sweden)

    Edlira Harizi (Shemsi

    2015-12-01

    Full Text Available Aim: The purpose of this study was twofold: i in a case-control design, to determine the relationship between anatomical variations of the circle of Willis and cerebrovascular accidents; ii to assess the association between anatomical variations of the circle of Willis and aneurisms among patients with subarachnoid hemorrhage. Methods: A case-control study was conducted in Albania in 2013-2014, including 100 patients with subarachnoid hemorrhage and 100 controls (individuals without cerebrovascular accidents. Patients with subarachnoid hemorrhage underwent a CT angiography procedure, whereas individuals in the control group underwent a magnetic resonance angiography procedure. Binary logistic regression was used to assess the association between cerebrovascular accidents and the anatomical variations of the circle of Willis. Conversely, Fisher’s exact test was used to compare the prevalence of aneurisms between subarachnoid hemorrhage patients with and without anatomical variations of the circle of Willis. Results: Among patients, there were 22 (22% cases with anatomical variations of the circle of Willis compared with 10 (10% individuals in the control group (P=0.033. There was no evidence of a statistically significant difference in the types of the anatomical variations of the circle of Willis between patients and controls (P=0.402. In age- and-sex adjusted logistic regression models, there was evidence of a significant positive association between cerebrovascular accidents and the anatomical variations of the circle of Willis (OR=1.87, 95%CI=1.03-4.68, P=0.048. Within the patients’ group, of the 52 cases with aneurisms, there were 22 (42.3% individuals with anatomical variations of the circle of Willis compared with no individuals with anatomical variations among the 48 patients without aneurisms (P<0.001. Conclusion: This study provides useful evidence on the association between anatomical variations of the circle of Willis and

  14. Anatomical Variations of the Circle of Willis in Males and Females on 3D MR Angiograms

    Directory of Open Access Journals (Sweden)

    Kawther A. Hafez, Nahla M. Afifi, Fardous Z. Saudi

    2007-03-01

    Full Text Available Objective: The objective of the present work was to study the anatomical variations of the circle of Willis as regard its component vessels and their average diameters in a sample of adult Egyptians and to detect any sex-related differences in these variations. Material and Methods: One hundred and twenty adult patients were observed (60 males and 60 females. They all had problems unrelated to any ischemic or vascular diseases, so they were considered as healthy control, concerning the morphology of the circle of Willis. In addition, ten cadavers' brains were obtained from the Anatomy department, Faculty of Medicine Ain Shams University for examination of the circle of Willis and for detection of any variations. Results: The anatomical variations of the anterior part, posterior part and completeness of the circle were inspected. Also, the diameters of all component vessels were assessed. The results indicated that, the anterior part of the circle was completed in 70% males and 75% females of the study sample. No statistically significant difference was detected between sexes. The most common variant of the anterior part was the single anterior communicating artery followed by the hypoplastic or absent anterior communicating artery. The posterior part of the circle was completed in 44% males and 58% females. The most common variant was the bilateral posterior communicating arteries, followed by the unilateral posterior communicating artery. An entirely complete circle was found only in 45% of the entire population; and it was higher in the females than the in males. The vessels diameters were smaller in the females than in the males, except for the diameter of the posterior communicating artery. Cadavers' examination revealed six cases with complete circle, 3 cases of unilateral fetal posterior communicating and one case of absent posterior communicating artery. Conclusion: The present study showed the amazing great variability of the anatomy of

  15. Study Circles as a Method of Informing the Adult Population on Radioactivity

    International Nuclear Information System (INIS)

    Public acceptance of the radioactive waste disposal facilities is difficult to achieve. Analysis of the reasons that underlie public rejection of radioactive waste disposal facilities shows that people are not adequately informed about the proposal. They also have a lot of prejudices due to the lack of knowledge and understanding about basic facts on radioactivity and environmental processes. ARAO has proposed that the topic of radioactivity and radioactive waste be included in the program of study circles in order to promote knowledge and understanding of these issues among the adult population in several Slovenian communities. Study circles are self-organized adult learning groups in the local community environment. Two study circles were initially proposed: one in Krsko, the community with a nuclear facility, and one in Radovljica, a community without a nuclear facility. Because of troubles with the unexpected politicization of nuclear issues, the study circle in Krsko was postponed to the later term, so that only the study circle in the community without the nuclear installation was active. The members were found by personal invitations. They worked on different issues dealing with radiation, mainly with the application of radiation and radioactive substances in medicine. Through the study circle activities the interest in radiation issues increased. The members reported that they disseminated their interest and acquired knowledge to their family members and friends. Our experience shows that self-learning in small groups, promoting discussions and the confrontation of different opinions, results in an increase in objective knowledge. Therefore, study circles can provide a good basis for confidence building in the nuclear technology.(author)

  16. Facies analysis and sequence stratigraphic framework of upper Campanian strata (Neslen and Mount Garfield formations, Bluecastle Tongue of the Castlegate sandstone, and Mancos shale), Eastern Book cliffs, Colorado and Utah

    Science.gov (United States)

    Kirschbaum, Mark A.; Hettinger, Robert D.

    2004-01-01

    Facies and sequence-stratigraphic analysis identifies six high-resolution sequences within upper Campanian strata across about 120 miles of the Book Cliffs in western Colorado and eastern Utah. The six sequences are named after prominent sandstone units and include, in ascending order, upper Sego sequence, Neslen sequence, Corcoran sequence, Buck Canyon/lower Cozzette sequence, upper Cozzette sequence, and Cozzette/Rollins sequence. A seventh sequence, the Bluecastle sequence, is present in the extreme western part of the study area. Facies analysis documents deepening- and shallowing- upward successions, parasequence stacking patterns, downlap in subsurface cross sections, facies dislocations, basinward shifts in facies, and truncation of strata.All six sequences display major incision into shoreface deposits of the Sego Sandstone and sandstones of the Corcoran and Cozzette Members of the Mount Garfield Formation. The incised surfaces represent sequence-boundary unconformities that allowed bypass of sediment to lowstand shorelines that are either attached to the older highstand shorelines or are detached from the older highstand shorelines and located southeast of the main study area. The sequence boundary unconformities represent valley incisions that were cut during successive lowstands of relative sea level. The overlying valley-fill deposits generally consist of tidally influenced strata deposited during an overall base level rise. Transgressive surfaces can be traced or projected over, or locally into, estuarine deposits above and landward of their associated shoreface deposits. Maximum flooding surfaces can be traced or projected landward from offshore strata into, or above, coastal-plain deposits. With the exception of the Cozzette/Rollins sequence, the majority of coal-bearing coastal-plain strata was deposited before maximum flooding and is therefore within the transgressive systems tracts. Maximum flooding was followed by strong progradation of

  17. Automatic Detection and Quantification of WBCs and RBCs Using Iterative Structured Circle Detection Algorithm

    Directory of Open Access Journals (Sweden)

    Yazan M. Alomari

    2014-01-01

    Full Text Available Segmentation and counting of blood cells are considered as an important step that helps to extract features to diagnose some specific diseases like malaria or leukemia. The manual counting of white blood cells (WBCs and red blood cells (RBCs in microscopic images is an extremely tedious, time consuming, and inaccurate process. Automatic analysis will allow hematologist experts to perform faster and more accurately. The proposed method uses an iterative structured circle detection algorithm for the segmentation and counting of WBCs and RBCs. The separation of WBCs from RBCs was achieved by thresholding, and specific preprocessing steps were developed for each cell type. Counting was performed for each image using the proposed method based on modified circle detection, which automatically counted the cells. Several modifications were made to the basic (RCD algorithm to solve the initialization problem, detecting irregular circles (cells, selecting the optimal circle from the candidate circles, determining the number of iterations in a fully dynamic way to enhance algorithm detection, and running time. The validation method used to determine segmentation accuracy was a quantitative analysis that included Precision, Recall, and F-measurement tests. The average accuracy of the proposed method was 95.3% for RBCs and 98.4% for WBCs.

  18. A simple technique for morphological measurement of cerebral arterial circle variations using public domain software (Osiris).

    Science.gov (United States)

    Ansari, Saeed; Dadmehr, Majid; Eftekhar, Behzad; McConnell, Douglas J; Ganji, Sarah; Azari, Hassan; Kamali-Ardakani, Shahab; Hoh, Brian L; Mocco, J

    2011-12-01

    This article describes a straightforward method to measure the dimensions and identify morphological variations in the cerebral arterial circle using the general-purpose software program Osiris. This user-friendly and portable program displays, manipulates, and analyzes medical digital images, and it has the capability to determine morphometric properties of selected blood vessels (or other anatomical structures) in humans and animals. To ascertain morphometric variations in the cerebral arterial circle, 132 brains of recently deceased fetuses, infants, and adults were dissected. The dissection procedure was first digitized, and then the dimensions were measured with Osiris software. Measurements of each vessel's length and external diameters were used to identify and classify morphological variations in the cerebral arterial circle. The most commonly observed anatomical variations were uni- and bilateral hypoplasia of the posterior communicating artery. This study demonstrates that public domain software can be used to measure and classify cerebral arterial circle vessels. This method could be extended to examine other anatomical regions or to study other animals. Additionally, knowledge of variations within the circle could be applied clinically to enhance diagnostic and treatment specificity. PMID:22254161

  19. The application of quality control circle in neurosurgery ICU nurses in raising compliance of the head of a bed

    OpenAIRE

    Li, Na; Sun, Jing

    2014-01-01

    Objective: To explore the application of quality control circle in raising compliance of the head of a bed in neurosurgery ICU nurses. Methods: The quality control circle was made up of 4 ICU nurses, determine the subject in order to improve the neurosurgery ICU nurses in raising compliance of the head of a bed, according to the QCC activity steps to formulate plans, including grasp the current situation, goal setting, through analysis, circle members develop strategy and plan implementation ...

  20. Telomeric circles are abundant in the stn1-M1 mutant that maintains its telomeres through recombination

    OpenAIRE

    Evelina Y Basenko; Cesare, Anthony J.; Iyer, Shilpa; Griffith, Jack D.; McEachern, Michael J.

    2009-01-01

    Some human cancers maintain their telomeres using the alternative lengthening of telomeres (ALT) mechanism; a process thought to involve recombination. Different types of recombinational telomere elongation pathways have been identified in yeasts. In senescing yeast telomerase deletion (ter1-Δ) mutants with very short telomeres, it has been hypothesized that copying a tiny telomeric circle (t-circle) by a rolling circle mechanism is the key event in telomere elongation. In other cases more cl...

  1. Application of laser scanning and opto-electronic devices for monitoring cliff instability in the Campi Flegrei coastal area: the Coroglio case study ( Napoli, Italy)

    Science.gov (United States)

    Somma, R.; Caputo, T.; Esposito, G.; Marino, E.; Matano, F.; Carlino, S.; Iuliano, S.; Sacchi, M.; Troise, C.; De Natale, G.

    2013-12-01

    This study introduces a Terrestrial Laser Scanning (TLS) application for the landslides monitoring and its experiment in Gulf of Pozzuoli coastal area (Italy). This area is a part of the Campi Flegrei volcanic district, one of the major volcanic risk zones of the world, with more than 300.000 people and a lot of infrastructures concentrated within it. The cliffs consist of very erodible volcanoclastic lithologies as same as tuffs and ignimbrites, affected by the erosive action of both sea and meteorological agents, very high erosion rate. Furthermore, in this area the bradyseismic phenomenon occurred too, producing differential displacement and fracturing. The Coroglio test site was chosen taking into account cliff's geological and geomorphological properties, as well as aspect, fractures, lithology, and elements at risk located upslope or downslope: The Coroglio site is characterized by lithified upper member of the NYT with stratified, wavy-to-planar alternations of coarse-grained, disorganized, matrix-supported layers, thinly-laminated discontinuous beds and massive, even fine ash layers. The accuracy of the technique used reaches a detailed level in landslide monitoring which allows this methodology to be complementary to the monitoring by setup a geodetic deformation monitoring network. With this aim we have firstly reconstructed a 3D model of the investigated cliff with the use of dedicated softwares and successively analyzed the main lithological, structural and geomorphologic elements related to cliff instability processes. What is possible to confirm after this first study, can be here resumed: (1) These tests were designed to set-up landslide monitoring in highly urbanised areas such as the Campi Flegrei; they are very important sites with a well-established road network, which can be affected by landslide phenomena as occurred in the past causing either traffic interruption and damage to infrastructures insisting along the landslides fronts. (2) In the

  2. Deposited radionuclides

    International Nuclear Information System (INIS)

    The results presented are from the nationwide programme to survey the fall-out levels of radionuclides in Finland. This programme includes results from the vicinities of the nuclear power plants at Loviisa and Olkiluoto. Analysis of deposition samples for their 3H, 89Sr and 90Sr, as well as 137Cs and other gamma radionuclide contents was continued. The results are given as a follow-up to the previous results. The cumulative deposition of long-lived radionuclides retained in soil was measured near the Finnish nuclear power stations. The 90Sr and 137Cs levels in deposition in 1979 were lower than in the previous two years, and no 89Sr was detected. The trend to slightly increasing 3H concentrations of previous years was reversed in 1979. The mean annual deposition of tritium at different sampling stations varied from 85 nCi/m2 (3.1 kBq/m2) to 180 nCi/m2 (6.7 kBq/m2). The total annual deposits of various fission product radionuclides have decreased continuously since the maximum in 1977. No short-lived radionuclides originating from either nuclear explosions or nuclear power plants were observed in 1979. (author)

  3. Deposited radionuclides

    International Nuclear Information System (INIS)

    The measurements presented here were carried out for determination of the fallout levels of radionuclides throughout the country, including the areas surrounding the nuclear power plants at Loviisa and Olkiluoto. The 90Sr, 137Cs and 3H contents of deposition were determined and the results are given as a follow-up to the previous results. 89Sr and other gammaradionuclides in addition to 137Cs were measured from wet and dry deposition. Also 89-90Sr, 239-240Pu, 137Cs and other gammaradionuclides deposited in soil were measured. The radiochemical separation technique was used to determine 89Sr, 90Sr, 137Cs and 239-240Pu. Tritium contents were determined by liquid scintillation counting after electrolytic enrichment. Gammaradionuclides were measured by Ge(Li) spectrometry. In 1977 the contents of the long-lived radionuclides 90Sr and 137Cs in deposition increased to almost the same level as in the early '70s. This is due to the high-yield atmospheric nuclear weapon tests carried out by China. A slight increase in 3H deposition can also be noticed in 1977. The results of soil sample measurements indicate that practically all the activity is found in the top 20 cm layer. (author)

  4. Deposited radionuclides

    International Nuclear Information System (INIS)

    Measurements were carried out to determine the fall-out levels of radionuclides in Finland including those from the surroundings of the nuclear power plants at Loviisa and Olkiluoto. Deposition samples were analysed for their 3H, 89Sr and 90Sr as well as 137Cs and other gamma radionuclide contents. 90Sr, 239,240Pu, as well as 137Cs and other gamma radionuclides deposited in soil were also measured. The 90Sr and 137Cs levels in deposition in 1978 remained at almost the same level as in 1977. The slightly increasing trend in 3H concentrations continued in 1978. The mean annual deposition of tritium at different sampling stations varied from 120 nCi/m2 (4.4 kBq/m2) to 200 nCi/m2 (7.4 kBq/m2). The total annual deposits of various fission product radionuclides during 1978 were smaller than during 1977. No increase in radioactivity originating from nuclear power plants could be observed. (author)

  5. Stream of Consciousness and Symbolism, the“Magic”Used by Heming-way to Characterize Harry as A Dying Man on the Cliff of Kilimanjaro

    Institute of Scientific and Technical Information of China (English)

    蓝清珂

    2016-01-01

    The Snows of Kilimanjaro was written in the 20th century when the realism was still the main stream in the field of litera-ture. However, Hemingway broke the cocoon of realism and flew into a new literary kingdom—modernism, where many new theories such as stream of consciousness and archetypal symbol blossomed and were used in literature. This paper mainly ana-lyzed how stream of consciousness and symbolism were used in the Snows of Kilimanjaro to characterize Harry as a dying man on the cliff of Kilimanjaro.

  6. The many ways of falling down a cliff: Culture- and Language-specific ways of expressing path in Jaminjung and Kriol

    OpenAIRE

    Hoffmann, Dorothea

    2011-01-01

    The many ways of falling down a cliff: Culture- and language-specific ways of expressing path in Jaminjung and KriolThis paper aims to give an overview of the strategies of motion event encoding in narrative and discourse for two Australian Aboriginal Languages. Jaminjung is a highly endangered non-Pama-Nyungan language spoken by approximately fifty people and Kriol is an English-lexified Creole with ca. 20,000 speakers of different varieties across northern Australia. The encoding of path is...

  7. Great circle solution to polarization-based quantum communication (QC) in optical fiber

    Science.gov (United States)

    Nordholt, Jane Elizabeth; Peterson, Charles Glen; Newell, Raymond Thorson; Hughes, Richard John

    2016-03-15

    Birefringence in optical fibers is compensated by applying polarization modulation at a receiver. Polarization modulation is applied so that a transmitted optical signal has states of polarization (SOPs) that are equally spaced on the Poincare sphere. Fiber birefringence encountered in propagation between a transmitter and a receiver rotates the great circle on the Poincare sphere that represents the polarization bases used for modulation. By adjusting received polarizations, polarization components of the received optical signal can be directed to corresponding detectors for decoding, regardless of the magnitude and orientation of the fiber birefringence. A transmitter can be configured to transmit in conjugate polarization bases whose SOPs can be represented as equidistant points on a great circle so that the received SOPs are mapped to equidistant points on a great circle and routed to corresponding detectors.

  8. Mosh pits and Circle pits: Collective motion at heavy metal concerts

    Science.gov (United States)

    Bierbaum, Matthew; Silverberg, Jesse L.; Sethna, James P.; Cohen, Itai

    2013-03-01

    Heavy metal concerts present an extreme environment in which large crowds (~102 -105) of humans experience very loud music (~ 130 dB) in sync with bright, flashing lights, often while intoxicated. In this setting, we find two types of collective motion: mosh pits, in which participants collide with each other randomly in a manner resembling an ideal gas, and circle pits, in which participants run collectively in a circle forming a vortex of people. We model these two collective behaviors using a flocking model and find qualitative and quantitative agreement with the behaviors found in videos of metal concerts. Futhermore, we find a phase diagram showing the transition from a mosh pit to a circle pit as well as a predicted third phase, lane formation.

  9. Effects of Video Modeling on Implementation of Literature Circles in Inclusive Content Area Classrooms

    Directory of Open Access Journals (Sweden)

    Lisa A. Dieker

    2008-07-01

    Full Text Available Trends in special education favor inclusion and concurrently the implementation of inclusive instructional practices. As students with learning disabilities are increasingly placed in general education classrooms, the need to assist general educators in establishing inclusive classrooms becomes a major priority. Cooperative learning, in the form of literature circles, is offered as a means of providing support to academically diverse student populations. In light of research-to-practice challenges, this study investigated the potential for students with learning disabilities and their peers to learn about literature circles by viewing video models of the practice in action. Students in the video modeling group demonstrated significantly more effective implementation of literature circles including cooperative behaviors, suggesting that video modeling could serve as a means of improving the translation of research on effective instructional strategies to actual practice in classrooms.

  10. A SEARCH FOR CONCENTRIC CIRCLES IN THE 7 YEAR WILKINSON MICROWAVE ANISOTROPY PROBE TEMPERATURE SKY MAPS

    International Nuclear Information System (INIS)

    In this Letter, we search for concentric circles with low variance in cosmic microwave background sky maps. The detection of such circles would hint at new physics beyond the current cosmological concordance model, which states that the universe is isotropic and homogeneous, and filled with Gaussian fluctuations. We first describe a set of methods designed to detect such circles, based on matched filters and χ2 statistics, and then apply these methods to the best current publicly available data, the 7 year Wilkinson Microwave Anisotropy Probe (WMAP) temperature sky maps. We compare the observations with an ensemble of 1000 Gaussian ΛCDM simulations. Based on these tests, we conclude that the WMAP sky maps are fully compatible with the Gaussian and isotropic hypothesis as measured by low-variance ring statistics.

  11. Reduced interface recombination in Cu2ZnSnS4 solar cells with atomic layer deposition Zn1-xSnxO buffer layers

    OpenAIRE

    Platzer-Björkman, Charlotte; Frisk, Christoper; Larsen, Jes; Ericson, Tove; Li, Shuyi; Scragg, Jonathan; Keller, Jan; Larsson, Fredrik; Törndahl, Tobias

    2015-01-01

    Cu2ZnSnS4 (CZTS) solar cells typically include a CdS buffer layer in between the CZTS and ZnO front contact. For sulfide CZTS, with a bandgap around 1.5 eV, the band alignment between CZTS and CdS is not ideal ("cliff-like"), which enhances interface recombination. In this work, we show how a Zn1-xSnxOy (ZTO) buffer layer can replace CdS, resulting in improved open circuit voltages (V-oc) for CZTS devices. The ZTO is deposited by atomic layer deposition (ALD), with a process previously develo...

  12. METALS DEPOSITS

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    <正>20111705 An Junbo(Team 603,Bureau of Nonferrous Metals Geological Exploration of Jilin Province,Hunchun 133300,China);Xu Renjie Geological Features and Ore Genesis of Baishilazi Scheelite Deposit in Yanbian Area(Jilin Geology,ISSN1001-2427,CN22-1099/P,29(3),2010,p.39-43,2 illus.,2 tables,7 refs.)Key words:tungsten ores,Jilin ProvinceThe Baishilazi scheelite deposit is located in contacting zone between the marble of the Late Palaeozoic Qinglongcun Group and the Hercynian biotite granite.The vein and lenticular major ore body is obviously controlled by NE-extending faults and con

  13. A Peculiarly Cerebroid Convex Zygo-Dodecahedron is an Axiomatically Balanced “House of Blues”: The Circle of Fifths to the Circle of Willis to Cadherin Cadenzas

    OpenAIRE

    Becker, David A.

    2012-01-01

    A bilaterally symmetrical convex dodecahedron consisting of twelve quadrilateral faces is derived from the icosahedron via a process akin to Fuller’s Jitterbug Transformation. The unusual zygomorphic dodecahedron so obtained is shown to harbor a bilaterally symmetrical jazz/blues harmonic code on its twelve faces that is related to such fundamental music theoretical constructs as the Circle of Fifths and Euler’s tonnetz. Curiously, the patterning within the aforementioned ...

  14. "Socratic Circles are a Luxury": Exploring the Conceptualization of a Dialogic Tool in Three Science Classrooms

    Science.gov (United States)

    Copelin, Michelle Renee

    Research has shown that dialogic instruction promotes learning in students. Secondary science has traditionally been taught from an authoritative stance, reinforced in recent years by testing policies requiring coverage. Socratic Circles are a framework for student-led dialogic discourse, which have been successfully used in English language arts and social studies classrooms. The purpose of this research was to explore the implementation process of Socratic Circles in secondary science classes where they have been perceived to be more difficult. Focusing on two physical science classes and one chemistry class, this study described the nature and characteristics of Socratic Circles, teachers' dispositions toward dialogic instruction, the nature and characteristics of student discussion, and student motivation. Socratic Circles were found to be a dialogic support that influenced classroom climate, social skills, content connections, and student participation. Teachers experienced conflict between using traditional test driven scripted teaching, and exploring innovation through dialogic instruction. Students experienced opportunities for peer interaction, participation, and deeper discussions in a framework designed to improve dialogic skills. Students in two of the classrooms showed evidence of motivation for engaging in peer-led discussion, and students in one class did not. The class that did not show evidence of motivation had not been given the same scaffolding as the other two classes. Two physical science teachers and one chemistry teacher found that Socratic Circles required more scaffolding than was indicated by their peers in other disciplines such as English and social studies. The teachers felt that student's general lack of background knowledge for any given topic in physical science or chemistry necessitated the building of a knowledge platform before work on a discussion could begin. All three of the teachers indicated that Socratic Circles were a

  15. Circle of Willis variation in a complex stroke presentation: a case report

    Directory of Open Access Journals (Sweden)

    Young Carolyn A

    2006-03-01

    Full Text Available Abstract Background The impact of circle of Willis anatomical variation upon the presentation of stroke is probably underrecognised. Case presentation A 63-year-old right-handed woman developed a left hemiparesis and right leg weakness sequentially following a road traffic accident (RTA. Despite initial concern about the possibility of cervical spinal cord injury, the final diagnosis was bilateral artery-to-artery embolic cerebral infarction with dominant right internal carotid artery. Conclusion The case illustrates the complex presentation of stroke as a pseudo-cervical cord lesion and the impact of circle of Willis anatomical variation upon the expression of large vessel cerebrovascular disease.

  16. From the Weyl quantization of a particle on the circle to number–phase Wigner functions

    Energy Technology Data Exchange (ETDEWEB)

    Przanowski, Maciej, E-mail: maciej.przanowski@p.lodz.pl; Brzykcy, Przemysław, E-mail: 800289@edu.p.lodz.pl; Tosiek, Jaromir, E-mail: jaromir.tosiek@p.lodz.pl

    2014-12-15

    A generalized Weyl quantization formalism for a particle on the circle is shown to supply an effective method for defining the number–phase Wigner function in quantum optics. A Wigner function for the state ϱ{sup ^} and the kernel K for a particle on the circle is defined and its properties are analysed. Then it is shown how this Wigner function can be easily modified to give the number–phase Wigner function in quantum optics. Some examples of such number–phase Wigner functions are considered.

  17. From the Weyl quantization of a particle on the circle to number–phase Wigner functions

    International Nuclear Information System (INIS)

    A generalized Weyl quantization formalism for a particle on the circle is shown to supply an effective method for defining the number–phase Wigner function in quantum optics. A Wigner function for the state ϱ^ and the kernel K for a particle on the circle is defined and its properties are analysed. Then it is shown how this Wigner function can be easily modified to give the number–phase Wigner function in quantum optics. Some examples of such number–phase Wigner functions are considered

  18. Investigation of Brain Arterial Circle Malformations Using Electrical Modelling and Simulation

    Directory of Open Access Journals (Sweden)

    Klara Capova

    2006-01-01

    Full Text Available The paper deals with the cerebral arterial system investigation by means of electrical modelling and simulations. The main attention is paid to the brain arterial circle malformations (stenoses and aneurysms and their determination and evaluation by computer-aided methods as tools of a non-invasive diagnostics. The compensation possibilities of brain arterial circle in case of presence of concrete arterial malformations are modelled and simulated. The simulation results of brain arteries blood pressures and volume flow velocities time dependences are presented and discussed under various health conditions.

  19. Shielded transient self-interaction of a bunch entering a circle from a straight path

    International Nuclear Information System (INIS)

    When a short (mm-length) bunch with high (nC-regime) charge is transported through a magnetic bending system, self-interaction via coherent synchrotron radiation (CSR) and space charge may alter the bunch dynamics significantly. The authors consider a Gaussian rigid-line-charge bunch following a straight-path trajectory into a circle, with the trajectory centered between two infinite, parallel, perfectly conducting plates. Transients associated with CSR and space charge generated from source particles both on the straight path and the circle are calculated, and their net effect on the radiated power is contrasted with that of shielded steady-state CSR

  20. Morphine dependence and dopaminergic activity: tests of circling responses in rats with unilateral nigral lesions.

    OpenAIRE

    Halliwell, J. V.; Kumar, R.

    1980-01-01

    1 Rats with unilateral electrolytic lesions involving both parts of the substantia nigra show dose-related, ipsilateral circling responses to apomorphine which are stable over time. 2 In non-tolerant rats, morphine (up to 10 mg/kg) does not elicit any circling behaviour but as tolerance develops to morphine, initially 10 mg/kg daily and then 100 ng/kg daily for about 4 months, the rats show a progressive tendency to walk more towards the side of the lesion. This behaviour is qualitatively dif...

  1. On the Ratio of Circumference to Diameter for the Largest Observable Circles: An Empirical Approach

    CERN Document Server

    Knox, Lloyd

    2012-01-01

    I present here a measurement of pi as determined for the largest observable circles. Intriguingly, the value of 16/5 asserted by the House of Representatives of the State of Indiana in 1897 is still viable, although strongly disfavored relative to 22/7, another popular value. The oft-used `small-circle' value of 3 is ruled out at greater than 5\\sigma. We discuss connections with string theory, sterile neutrinos, and possibilities for (very large) lower limits to the size of the Universe.

  2. Gauge theory duals of black hole – black string transitions of gravitational theories on a circle

    International Nuclear Information System (INIS)

    We study the black hole – black string phase transitions of gravitational theories compactified on a circle using the holographic duality conjecture. The gauge theory duals of these theories are maximally supersymmetric and strongly coupled 1 + 1 dimensional SU(N) Yang-Mills theories compactified on a circle, in the large N limit. We perform the strongly coupled finite temperature gauge theory calculations on a lattice, using the recently developed exact lattice supersymmetry methods based on topological twisting and orbifolding. The spatial Polyakov line serves as relevant order parameter of the confinement – deconfinement phase transitions in the gauge theory duals

  3. Empirical Research on the Urban Development Level of Wuhan Urban Circle

    Directory of Open Access Journals (Sweden)

    Yazhou Xiong

    2013-03-01

    Full Text Available The research object of this paper is the nine cities of Wuhan urban circle. Firstly, this paper establishes the comprehensive evaluation indicator system and evaluation model of the urban development level via systems analysis, then makes a PCA (Principal Components Analysis to the original data by means of SPSS; Next, this paper analyzes the worked data via AHP (Analytic Hierarchy Process and comprehensive score and ranking of the nine cities is obtained and the nine cities are divided into three clusters via K-means clustering analysis; Finally, this paper appraises urban development level of Wuhan urban circle.

  4. METALS DEPOSITS

    Institute of Scientific and Technical Information of China (English)

    2015-01-01

    20150904An Fang(State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi’an 710069,China);Wang Juli Skarn Mineral Assemblage in Representative Ore Districts of Sayak Copper Orefield,Kazakhstan,and Its Genetic Implications(Mineral Deposits,ISSN0258-7106,CN11-1965/P,33(3),2014,p.521-540,

  5. NONMETALS DEPOSITS

    Institute of Scientific and Technical Information of China (English)

    2013-01-01

    <正>20131601 Gao Junbo(College of Resources and Environmental Engineering,Guizhou University,Guiyang 550003,China);Yang Ruidong Hydrothermal Venting-Flowing Sedimentation Characteristics of Devonian Barite Deposits from Leji,Zhenning County,Guizhou Province(Acta Sedimentologica Sinica,ISSN1000-0550,CN62-1038/P,30(3),

  6. Migraine with aura is associated with an incomplete circle of willis: results of a prospective observational study.

    Directory of Open Access Journals (Sweden)

    Brett Cucchiara

    Full Text Available OBJECTIVE: To compare the prevalence of an incomplete circle of Willis in patients with migraine with aura, migraine without aura, and control subjects, and correlate circle of Willis variations with alterations in cerebral perfusion. METHODS: Migraine with aura, migraine without aura, and control subjects were prospectively enrolled in a 1∶1∶1 ratio. Magnetic resonance angiography was performed to examine circle of Willis anatomy and arterial spin labeled perfusion magnetic resonance imaging to measure cerebral blood flow. A standardized template rating system was used to categorize circle of Willis variants. The primary pre-specified outcome measure was the frequency of an incomplete circle of Willis. The association between circle of Willis variations and cerebral blood flow was also analyzed. RESULTS: 170 subjects were enrolled (56 migraine with aura, 61 migraine without aura, 53 controls. An incomplete circle of Willis was significantly more common in the migraine with aura compared to control group (73% vs. 51%, p = 0.02, with a similar trend for the migraine without aura group (67% vs. 51%, p = 0.08. Using a quantitative score of the burden of circle of Willis variants, migraine with aura subjects had a higher burden of variants than controls (p = 0.02. Compared to those with a complete circle, subjects with an incomplete circle had greater asymmetry in hemispheric cerebral blood flow (p = 0.05. Specific posterior cerebral artery variants were associated with greater asymmetries of blood flow in the posterior cerebral artery territory. CONCLUSIONS: An incomplete circle of Willis is more common in migraine with aura subjects than controls, and is associated with alterations in cerebral blood flow.

  7. ULYSSES comes full circle, before revisiting the Sun's poles

    Science.gov (United States)

    1998-04-01

    From its unique perspective, Ulysses has provided scientists with the very first all-round map of the heliosphere, the huge bubble in space filled by the Sun's wind. The Earth swims deep inside the heliosphere, and gusts and shocks in the solar wind can harm satellites, power supplies and ommunications. They may also affect our planet's weather. A better grasp of the solar weather in the heliosphere is therefore one of the major aims of ESA's science programme. In a project of international cooperation between ESA and NASA, Ulysses was launched towards Jupiter in October 1990 by the US space shuttle Discovery. Arriving in February 1992, Ulysses stole energy from the giant planet in a slingshot manoeuvre and was propelled back towards the Sun in an elongated orbit almost at right angles to the ecliptic plane, where the Earth and other planets circle the Sun. "This month Ulysses returns to the point in space where its out-of-ecliptic journey began, but Jupiter isn't there," explains Richard Marsden, ESA's project scientist for Ulysses. "Following its own inexorable path around the Sun, Jupiter is far away on the opposite side of the Solar System. So Ulysses' course will not be changed a second time. The spacecraft is now in effect a man-made comet, forever bound into a 6-year polar orbit around the Sun." Ulysses now starts its second orbit. It will travel over the poles of the Sun in 2000-2001 just as the count of dark sunspots is expected to reach a maximum. With its operational life extended for the Ulysses Solar Maximum Mission, the spacecraft will find the heliosphere much stormier than during its first orbit. Discoveries so far Like its mythical namesake, Ulysses has already had an eventful voyage of discovery. Its unique trajectory has provided the scientific teams with a new perspective, from far out in space and especially in the previously unknown regions of the heliosphere over the Sun's poles. Passing within 9.8 degrees of the polar axis, the highly

  8. Mortality due to a retained circle hook in a longfin mako shark Isurus paucus (Guitart-Manday).

    Science.gov (United States)

    Adams, D H; Borucinska, J D; Maillett, K; Whitburn, K; Sander, T E

    2015-07-01

    A female longfin mako shark Isurus paucus (Guitart-Manday, 1966) was found moribund on the Atlantic Ocean beach near Canaveral National Seashore, Florida; the shark died shortly after stranding. Macroscopic lesions included a partially healed bite mark on the left pectoral fin, a clefted snout, pericardial effusion and a pericardial mass surrounding a 12/0 circle fishing hook. The heart, pericardial mass, gills, ovary, oviduct, shell gland, epigonal organ, liver, kidney and intrarenal and interrenal glands were processed for histopathology and examined by brightfield microscopy. Microscopic examination revealed chronic proliferative and pyogranulomatous pericarditis and myocarditis with rhabdomyolysis, fibrosis and thrombosis; scant bacteria and multifocal granular deposits of iron were found intralesionally. In addition, acute, multifocal infarcts within the epigonal organ and gill filaments were found in association with emboli formed by necrocellular material. The ovary had high numbers of atretic follicles, and the liver had diffuse, severe hepatocellular degeneration, multifocal spongiosis and moderate numbers of melanomacrophage cells. This report provides evidence of direct mortality due to systemic lesions associated with retained fishing gear in a prohibited shark species. Due to the large numbers of sharks released from both recreational and commercial fisheries worldwide, impact of delayed post-release mortality on shark populations is an important consideration. PMID:24974904

  9. Video image cliff notes

    Science.gov (United States)

    Szu, Harold; Hsu, Charles

    2012-06-01

    Can a compressive sampling expert system help to build a summary of a video in a composited picture? Digital Internet age has provided all with an information degree of freedom; but, comes with it, the societal trash being accumulated beyond analysts to sort through, to summary video automatically as a digital library category. While we wish preserve the spirit of democratic Smartphone-Internet to all, we provide an automation and unbiased tool called the compressive sampling expert system (CSpES) to summarize the video content at user's own discretion.

  10. Edge of a cliff

    CERN Document Server

    Shimizu, Yusuke

    2016-01-01

    We discuss the neutrino flavor structures in the Occam's razor approach for the Dirac neutrino mass matrices. We assume that the charged lepton mass matrix takes a diagonal base, while the right-handed Majorana neutrino mass matrix is also diagonal and we consider nine patterns of the four zero textures for the Dirac neutrinos mass matrices. We numerically analyze the left-handed Majorana neutrino mass matrices for nine patterns of the Dirac neutrino mass matrices and we found two interesting patterns where both normal and inverted neutrino mass hierarchies can be realized. We also found if the neutrino mass is normal hierarchy, this scenario will be likely to be excluded by the measurements of the Dirac CP violating phase in the T2K and NO$\

  11. America's fiscal cliff

    OpenAIRE

    Ethan Ilzetzki; Jonathan Pinder

    2012-01-01

    The US economy is still suffering from its most severe recession in seven decades. This article covers the key issue of taxes, spending and public debt, a major point of disagreement between the two candidates in the 2012 US election, President Obama and Governor Romney.

  12. THE INTEGRATED STATE OF THE ROLLING-CIRCLE PLASMID PTB913 IN THE COMPOSITE BACILLUS PLASMID PTB19

    NARCIS (Netherlands)

    OSKAM, L; HILLENGA, DJ; VENEMA, G; BRON, S

    1992-01-01

    pTB19, a 27 kb plasmid originating from a thermophilic Bacillus species, contains integrated copies of two rolling-circle type plasmids on a 10.6 kb DNA fragment. In the present study we analysed the part of pTB19 that contains the rolling-circle plasmid pTB913 and the region in between the two roll

  13. Collusive attacks to "circle-type" multi-party quantum key agreement protocols

    Science.gov (United States)

    Liu, Bin; Xiao, Di; Jia, Heng-Yue; Liu, Run-Zong

    2016-05-01

    We find that existing multi-party quantum key agreement (MQKA) protocols designed for fairness of the key are, in fact, unfair. Our analysis shows that these protocols are sensitive to collusive attacks; that is, dishonest participants can collaborate in predetermining the key without being detected. In fact, the transmission structures of the quantum particles in those unfair MQKA protocols, three of which have already been analyzed, have much in common. We call these unfair MQKA protocols circle-type MQKA protocols. Likewise, the transmission structures of the quantum particles in MQKA protocols that can resist collusive attacks are also similar. We call such protocols complete-graph-type MQKA protocols. A MQKA protocol also exists that can resist the above attacks but is still not fair, and we call it the tree-type MQKA protocol. We first point out a common, easily missed loophole that severely compromises the fairness of present circle-type MQKA protocols. Then we show that two dishonest participants at special positions can totally predetermine the key generated by circle-type MQKA protocols. We anticipate that our observations will contribute to secure and fair MQKA protocols, especially circle-type protocols.

  14. Education, Enlightenment and Positivism: The Vienna Circle's Scientific World-Conception Revisited

    Science.gov (United States)

    Uebel, Thomas E.

    2004-01-01

    The scientific world-conception is properly understood as an enlightenment philosophy only if the current reassessment of the historical Vienna Circle(as opposed to the caricature still prevalent in the popular philosophical imagination) is once more extended to comprehend not only its thorough-going epistemological anti-foundationalism, but also…

  15. Quasi-symmetric Conjugacy of Blaschke Products on the unit Circle

    DEFF Research Database (Denmark)

    Petersen, Carsten Lunde

    2007-01-01

    Let B be a Blaschke product for which the restriction to the unit circle 1 is a degree d > 1 covering. We prove that B is quasi-symmetrically conjugate to z zd on 1, if all its periodic points in 1 are repelling and if 1 does not intersect the -limit set of any recurrent critical point for B....

  16. Role of quality circles in dose control programs at Kaiga generating station

    International Nuclear Information System (INIS)

    To operate the nuclear power station with maximum capacity factors and lowest collective dose it is imperative that a sense of belongingness among the employees is essential. Quality Circles provide an opportunity to the plant personnel irrespective of their grade or discipline to come together to solve the work related problems in a scientific manner to enhance the productivity and safety in the work environment. The concept of Quality Circles came to Kaiga during July 1998. The thought revolution grew slowly and steadily and brought big gains to the station. The organized thoughts and concerted actions in field resulted in development of good work culture among the employees, an important input to achieve super excellence in power generation in the most cost effective manner. This also is a means to set challenging targets and make and break the records among the NPCIL units. The genesis of Quality Circles, the methodology of QC working, promotional activities, the progress and programs of Quality Circles are discussed in this presentation. (author)

  17. Approximation by polynomials and Blaschke products having all zeros on a circle

    CERN Document Server

    Farmer, David W

    2010-01-01

    We show that a nonvanishing analytic function on a domain in the unit disc can be approximated by (a scalar multiple of) a Blaschke product whose zeros lie on a prescribed circle enclosing the domain. We also give a new proof of the analogous classical result for polynomials. A connection is made to universality results for the Riemann zeta function.

  18. The Schwinger model on a circle: Relation between path integral and Hamiltonian approaches

    International Nuclear Information System (INIS)

    We solve the massless Schwinger model exactly in Hamiltonian formalism on a circle. We construct physical states explicitly and discuss the role of the spectral flow and nonperturbative vacua. Different thermodynamical correlation functions are calculated and after performing the analytical continuation are compared with the corresponding expressions obtained for the Schwinger model on the torus in Euclidean Path Integral formalism obtained before. (author)

  19. Encounters with Wisdom: A Case Study of Community Worker Reflection Circles in San Antonio, TX

    Science.gov (United States)

    Arispe, Don D.

    2013-01-01

    This case study focuses upon the transformational experiences of 28 social service and pastoral workers engaged in a Reflection Circle Process (RCP) in San Antonio, TX. The RCP involves the writing of a holistic journal entry, known as a process note, coupled with an in-depth exploration of the note with the help of a group of trusted peers, known…

  20. An Investigation of "Circle of Friends" Peer-Mediated Intervention for Students with Autism

    Science.gov (United States)

    Schlieder, Mary; Maldonado, Nancy; Baltes, Beate

    2014-01-01

    The dramatic rise in children diagnosed with autism spectrum disorder (ASD) is accompanied by a substantial increase in public school inclusion. A growing body of research supports the need for teachers proficient in evidence-based practices to support such students. One strategy involves using peer support networks like Circle of Friends (CoF)…

  1. Strategic Sustainability Management for Enhancing Corporate Value: in the context of Korean Business Circles

    NARCIS (Netherlands)

    Y-G. Ahn

    2007-01-01

    textabstractIn line with the growing importance of Corporate Sustainability Management (CSM) in business circles, the linkages between CSM, corporate values and performance is becoming increasingly higher on the agenda both for internal corporate management purposes and for external relations for co

  2. Effect of hybrid circle reservoir injected with wavelet-neurons on performance of echo state network.

    Science.gov (United States)

    Cui, Hongyan; Feng, Chen; Chai, Yuan; Liu, Ren Ping; Liu, Yunjie

    2014-09-01

    The Echo State Network (ESN) has attracted wide attention for its superior performance in chaos time-series prediction. However, the complicated ESN topologies and the random reservoirs are difficult to implement in practice. We propose a hybrid circle reservoir (HCR) ESN architecture that comprises the following features: (1) built with low complexity circle reservoir; (2) partly injected with wavelet-neurons; (3) uses fixed connection weights in both input matrix and dynamic reservoir matrix. The HCR model has been successfully applied to solve six application problems, and the results are used to compare with the existing low complexity simple circle reservoir (SCR) ESN. Furthermore, we analyze the performance of the new model under different ratios of wavelet-neurons, different circle distributions and different input sign patterns. Simulation results show that the HCR model achieves significantly better performance in prediction accuracy than the SCR model. Additionally, the HCR model has similar low complexity as the SCR. Moreover, the short-term memory capacity (MC) in the HCR is close to the theoretical optimal MC value. PMID:24997457

  3. The Arithmetic of Elliptic Fibrations in Gauge Theories on a Circle

    CERN Document Server

    Grimm, Thomas W; Klevers, Denis

    2015-01-01

    The geometry of elliptic fibrations translates to the physics of gauge theories in F-theory. We systematically develop the dictionary between arithmetic structures on elliptic curves as well as desingularized elliptic fibrations and symmetries of gauge theories on a circle. We show that the Mordell-Weil group law matches integral large gauge transformations around the circle in Abelian gauge theories and explain the significance of Mordell-Weil torsion in this context. We also use Higgs transitions and circle large gauge transformations to introduce a group law for genus-one fibrations with multi-sections. Finally, we introduce a novel arithmetic structure on elliptic fibrations with non-Abelian gauge groups in F-theory. It is defined on the set of exceptional divisors resolving the singularities and divisor classes of sections of the fibration. This group structure can be matched with certain integral non-Abelian large gauge transformations around the circle when studying the theory on the lower-dimensional ...

  4. Circle Justice: A Creative Arts Approach to Conflict Resolution in the Classroom

    Science.gov (United States)

    Gibbons, Karen

    2010-01-01

    This brief report describes a cooperative classroom art therapy intervention in a public elementary school that provided conflict resolution education, social learning, and group cohesion among sixth-grade students. The organizing framework of a "circle justice" group explored the roles of fictional characters in conflict, including group…

  5. Circle of Life HIV/AIDS-Prevention Intervention for American Indian and Alaska Native Youth

    Science.gov (United States)

    Kaufman, Carol E.; Litchfield, Anne; Schupman, Edwin; Mitchell, Christina M.

    2012-01-01

    This article describes the objectives, theoretical bases, development process, and evaluation efforts to-date for the Circle of Life (COL) curricula, HIV/AIDS prevention interventions designed for American Indian and Alaska Native (AI/AN) youth. The curricula are based on Indigenous models of learning and behavior encompassing concepts of Western…

  6. Volunteers in Circles of Support and Accountability : Job demands, job resources, and outcome

    NARCIS (Netherlands)

    Höing, M.A.; Vogelvang, B.; Bogaerts, Stefan

    2016-01-01

    In Circles of Support and Accountability (CoSA), volunteers support a medium- to high-risk sex offender in his process toward desistance by developing a long-term empathic relationship. More knowledge is needed about the impact of this work on volunteers themselves. In a sample of 40 Dutch CoSA volu

  7. 圆环上的逆shadowing映射%Shadowing and inverse shadowing property on circle

    Institute of Scientific and Technical Information of China (English)

    韩英豪; 葛琦; 南华

    2005-01-01

    In this paper we show that the concepts of shadowing and (Tc,Th-)inverse shadowing of circle homeomorphisms are equivalent.%本文证明了圆环上shadowing性质和(Tc,Th-)逆shadowing性质的等价性.

  8. Minimal fixed point set of maps on Torus Fiber Bundles over the Circle

    OpenAIRE

    Silva, Weslem L.

    2013-01-01

    The main purpose this work is to study the minimal fixed point set of fiber-preserving maps for spaces which are fiber bundles over the circle and the fiber is the torus. Using the one-parameter fixed point theory is possible to describe these sets in terms of the fundamental group and the induced homomorphism.

  9. Branch structures at the steps of the devil's staircase of the sine circle map

    International Nuclear Information System (INIS)

    We have discovered substructures consisting of branches at each step of the devil's staircase of the sine circle map. These substructures are found to follow the hierarchy of the Farey tree. We develop a formalism to relate the rational winding number W=p/q to the number of branches in these substructures

  10. Runaway Climate Change as Challenge to the "Closing Circle" of Education for Sustainable Development

    Science.gov (United States)

    Selby, David; Kagawa, Fumiyo

    2010-01-01

    Education for sustainable development (ESD) is the latest and thickest manifestation of the "closing circle" of policy-driven environmental education. Characterised by definitional haziness, a tendency to blur rather than lay bare inconsistencies and incompatibilities, and a cozy but ill-considered association with the globalisation agenda, the…

  11. Talking Circles, Leadership Competencies, and Inclusive Learning: Expanding the Frame of Business Education

    Science.gov (United States)

    Cowan, David A.; Beard Adams, Kathy M.

    2008-01-01

    Business education typically embodies traditional organizational values, structures, and processes that focus learning mostly on uniformity and efficiency. In contrast, many First Nation peoples have long used the imagery of a circle as a guiding metaphor for both organizing and educating in ways that respect diversity and align themselves with…

  12. Talking Books: Gender and the Responses of Adolescents in Literature Circles

    Science.gov (United States)

    Lloyd, Rachel Malchow

    2006-01-01

    The use of student-led discussions, or literature circles, offers the potential to engage all students through a more democratic, dialogic approach. The central goal of this research was to understand how adolescents practise literacy within the context of a peer reading group, and how gender impacts these practices. Transcripts of student-led…

  13. The Listening Circle: Using the SBI Model to Enhance Peer Feedback

    Science.gov (United States)

    Bommelje, Rick

    2012-01-01

    The Listening Circle is a learning activity that is designed to provide students with the opportunity to connect listening knowledge with observed behaviors and to strengthen student peer feedback. Not knowing how to give feedback can result in messages that are confusing, tactless, and counter-productive. Many feedback messages leave the receiver…

  14. The Schwinger Model on a circle: relation between Path Integral and Hamiltonian approaches

    OpenAIRE

    Azakov, Siyavush

    2005-01-01

    We solve the massless Schwinger model exactly in Hamiltonian formalism on a circle. We construct physical states explicitly and discuss the role of the spectral flow and nonperturbative vacua. Different thermodynamical correlation functions are calculated and after performing the analytical continuation are compared with the corresponding expressions obtained for the Schwinger model on the torus in Euclidean Path Integral formalism obtained before.

  15. Some Comments On: A Historical Note on the Proof of the Area of a Circle

    Science.gov (United States)

    Naidu, Jaideep T.; Sanford, John F.

    2011-01-01

    In a recent paper by Wilamowsky et al. [6], an intuitive proof of the area of the circle dating back to the twelfth century was presented. They discuss challenges made to this proof and offer simple rebuttals to these challenges. The alternative solution presented by them is simple and elegant and can be explained rather easily to non-mathematics…

  16. Evaluation Learning Circles: A Sole Proprietor's Evaluation Capacity-Building Strategy

    Science.gov (United States)

    Cohen, Carolyn

    2006-01-01

    This paper presents a case study which illustrates the author's experience as a sole proprietor taking on the collegial roles of both learning partner and coach, using an evaluation capacity-building strategy she called an evaluation learning circle (ELC). Facilitating the ELC was one of a variety of tasks she conducted as part of a multiyear…

  17. Constructing Knowledge about the Trigonometric Functions and Their Geometric Meaning on the Unit Circle

    Science.gov (United States)

    Altman, Renana; Kidron, Ivy

    2016-01-01

    Processes of knowledge construction are investigated. A learner is constructing knowledge about the trigonometric functions and their geometric meaning on the unit circle. The analysis is based on the dynamically nested epistemic action model for abstraction in context. Different tasks are offered to the learner. In his effort to perform the…

  18. Self-calibration of divided circles on the basis of a prime factor algorithm

    International Nuclear Information System (INIS)

    A new method for the self-calibration of divided circles is presented which is based on a known prime factor algorithm for the discrete Fourier transform (DFT). The method, called prime factor division (PFD) calibration, is of interest in angle metrology specially for self-calibrating angle encoders, and generally for a significant shortening of the cross-calibration between two divided circles. It requires that the circular division number N can be expressed as a product N = R × S, whereby the factors R and S are relatively prime integer numbers. For the self-calibration of a divided circle, N difference measurements between R angle positions in a regular distribution and one reference angle position determined by S are evaluated by a two-dimensional DFT, yielding the N absolute division errors. The factor R is preferably chosen small, down to a minimum of R = 2, whereas the factor S may be as large as appropriate for the division number N of interest. In the case of a cross-calibration between two divided circles, the PFD method reduces the number of measurements necessary from N2 to (R + 1) × N. Experimental results are demonstrated for the calibrations of an optical polygon with 24 faces (prime factor product 3 × 8) and a gearwheel with 44 teeth (prime factor product 4 × 11)

  19. "Slow Down, You Move Too Fast:" Literature Circles as Reflective Practice

    Science.gov (United States)

    Sanacore, Joseph

    2013-01-01

    Becoming an effective literacy learner requires a bit of slowing down and appreciating the reflective nature of reading and writing. Literature circles support this instructional direction because they provide opportunities for immersing students in discussions that encourage their personal responses. When students feel their personal responses…

  20. Always Searching for Strengths: Interviewing and Counseling with the Circle of Courage

    Science.gov (United States)

    Frankowski, Barbara; Duncan, Paula

    2013-01-01

    Several excellent frameworks exist that define components of positive youth development and demonstrate an inverse relationship with adolescent risks (Ginsburg, 2007). The authors have found that many of their colleagues have been drawn to the Circle of Courage for its clarity and spirit (Brendtro, Brokenleg, & Van Bockern, 2002). This model is…

  1. Facebook and Virtual Literature Circle Partnership in Building a Community of Readers

    Science.gov (United States)

    Stewart, Paulette

    2009-01-01

    Social networks have given rise to a reading activity called an online literature circle. Generally from four to six students meet together in an online chat room to discuss the same reading. In this environment students engage in critical thinking and reflection as they read, discuss and respond to books. Collaboration is at the heart of this…

  2. Using Social Networks and ICTs to Enhance Literature Circles: A Practical Approach

    Science.gov (United States)

    Walker, Andrea

    2010-01-01

    The purpose of this paper is to describe and demonstrate how social networks such as "Facebook" and "Goodreads", and information and communication technologies (ICTs) tools like laptops and iPods can support and enhance literature circles. The innovation described is implemented by the library and aims to promote reading for all students…

  3. Circle of Willis variant analogous to fetal type primitive trigeminal artery

    International Nuclear Information System (INIS)

    Primitive caroticobasilar anastomoses are uncommon embryonic arterial connections between the carotid (anterior) and vertebrobasilar (posterior) circulations. With the exception of extracranial proatlantal intersegmental arteries, these embryonic arterial anastomoses are named according to the cranial nerves which they parallel. In this report, a previously undescribed variant circle of Willis with supraclinoid caroticobasilar anastomosis, functionally equivalent to a fetal type primitive trigeminal artery, is presented. (orig.)

  4. Reactivation of chromosomally integrated human herpesvirus-6 by telomeric circle formation.

    Directory of Open Access Journals (Sweden)

    Bhupesh K Prusty

    Full Text Available More than 95% of the human population is infected with human herpesvirus-6 (HHV-6 during early childhood and maintains latent HHV-6 genomes either in an extra-chromosomal form or as a chromosomally integrated HHV-6 (ciHHV-6. In addition, approximately 1% of humans are born with an inheritable form of ciHHV-6 integrated into the telomeres of chromosomes. Immunosuppression and stress conditions can reactivate latent HHV-6 replication, which is associated with clinical complications and even death. We have previously shown that Chlamydia trachomatis infection reactivates ciHHV-6 and induces the formation of extra-chromosomal viral DNA in ciHHV-6 cells. Here, we propose a model and provide experimental evidence for the mechanism of ciHHV-6 reactivation. Infection with Chlamydia induced a transient shortening of telomeric ends, which subsequently led to increased telomeric circle (t-circle formation and incomplete reconstitution of circular viral genomes containing single viral direct repeat (DR. Correspondingly, short t-circles containing parts of the HHV-6 DR were detected in cells from individuals with genetically inherited ciHHV-6. Furthermore, telomere shortening induced in the absence of Chlamydia infection also caused circularization of ciHHV-6, supporting a t-circle based mechanism for ciHHV-6 reactivation.

  5. Early-Years Teachers' Concept Images and Concept Definitions: Triangles, Circles, and Cylinders

    Science.gov (United States)

    Tsamir, Pessia; Tirosh, Dina; Levenson, Esther; Barkai, Ruthi; Tabach, Michal

    2015-01-01

    This study investigates practicing early-years teachers' concept images and concept definitions for triangles, circles, and cylinders. Teachers were requested to define each figure and then to identify various examples and non-examples of the figure. Teachers' use of correct and precise mathematical language and reference to critical and…

  6. Univocally determining the cosmic topology from the detection of circles in the sky

    International Nuclear Information System (INIS)

    Full text: While the topology of the spatial sections of the Universe is at present not specified by any known fundamental theory, it may in principle be determined through observations. In particular, a detectable non-trivial topology will generate pairs of matching circles of temperature fluctuations in maps of the cosmic microwave background, the so-called circles-in-the-sky. Each matching circle pair corresponds to an element of the holonomy group that determines the topology. However, generically, a complete set of generators for the holonomy group will not be detected, so it is not clear that the topology can be uniquely determined from such an observation. With that in mind, in the present work we seek to determine I) If, and how, the angular parameters of a correlated circle pair in a CMB map determines univocally the element in the holonomy group generating such correlation, irrespective of the observer's position in the manifold II) If, or to what extent, the detection of one or more elements of the spatial section's holonomy group univocally specifies the topology of the 3-manifold describing spatial sections of the Universe, and determines out position in it. III) If, or to what extent, the detection of one or more elements of the spatial section's holonomy group univocally specifies the geometry (namely, the sign of the curvature) of the 3-manifold describing spatial sections of the Universe IV) How the (possibly partial) determination of the topology of the 3-manifold describing spatial sections of the Universe from the detection of correlated circle pairs, combined with some other measure of its compactification lengths, constrains the cosmological density parameters. We show explicitly that, for many cases of flat manifolds, the full holonomy group, and by extension the full topology, can be completely determined, or severely constrained, by the determination of the geometrical parameters of a single matching circles pair associated with a non

  7. An inversion formula for the spherical transform in S2 for a special family of circles of integration

    Science.gov (United States)

    Salman, Yehonatan

    2016-03-01

    In this article, an inversion formula is obtained for the spherical transform which integrates functions, defined on the unit sphere S2, on circles. The inversion formula is for the case where the circles of integration are obtained by intersections of S2 with hyperplanes passing through a common point overline{a} strictly inside S2. In particular, this yields inversion formulas for two well-known special cases. The first inversion formula is for the special case where the family of circles of integration consists of great circles; this formula is obtained by taking overline{a} = 0. The second inversion formula is for the special case where the circles of integration pass through a common point p on S2; this formula is obtained by taking the limit overline{a}→ p.

  8. New mechanized system for circle spraying of oil palms seedling emergence

    Directory of Open Access Journals (Sweden)

    Darius El Pebrian

    2012-04-01

    Full Text Available A new machine system has been designed, developed and evaluated for extensive circle spraying of oil palms (Elaeis guineensis Jacq. in an effort to overcome the inefficient spraying problem with the conventional spraying system. The machine system consists of a four-wheeled drive 4WD prime mover with front mounted machine attachments for the circle spraying operation. The configuration of the circle spraying attachment consists of a hexagonal curved spray boom, lifting arm, opening-tilting mechanism unit, storage tank, spray pump, solid cone nozzles, and associate hydraulic system. Field performance tests on the machine system showed an average effective field capacity of 7.89 ha per man per day and when compared to the earlier reported effective field capacity of the walking spray-operated equipment using Serena LT16 knapsack sprayer; a difference of 1.97 time for circle spraying of mature palms grove. Reduction in the human energy expenditure of 101.28 kJ man-1 h-1 or 10.68 % but an increase in the spraying cost of 1.53 USD ha-1 or 24.9 % were obtained with the machine system against the walking spraying-operated equipment using Serena LT16 knapsack sprayer. Justification for machine system to be cost effective could be satisfied if the present effective field capacity is increased to 1.263 time with good skilled operator or if the current R&D cost is reduced to 0.41 time. This is because the improved field capacity of new machine system could not rationalize its current R&D cost. Admittedly, the machine system has great potential to overcome the limitations with the current employed machine/equipment in the circle spraying operation of oil palms in the plantation.

  9. Deposit insurance and international bank deposits

    OpenAIRE

    Harry Huizinga; Gaëtan Nicodème

    2003-01-01

    This paper examines how international depositors respond to national deposit insurance policies. Countries with explicit deposit insurance are found to be relatively attractive to international non-bank depositors. Deposit schemes characterized by co-insurance, a private administration, and a low deposit insurance premium appear to be particularly favored by these depositors. The sensitivity of non-bank deposits to deposit insurance policies opens up the possibility of international regulator...

  10. 一种工程图中圆的整体识别方法%A Method of Global Recogniting Circles about Engineering Drawing

    Institute of Scientific and Technical Information of China (English)

    张显全

    2003-01-01

    In study on recognition of engineering drawings,the recognition for circle is a key technology. A newmethod of global recognition circle about engineering drawing is presented. Image of engineering drawing is process-ed. It depends on the circular arc of the image,the circle or circular arc is global recognized by tracing the circle direc-tion and region. Experimental results show that the method is feasibility and availability.

  11. Environmental radionuclide concentrations in the vicinity of the Calvert Cliffs Nuclear Power Plant and the Peach Bottom Atomic Power Station: 1996--1997. Final report

    International Nuclear Information System (INIS)

    The Maryland Power Plant Research Program monitors concentrations of natural, weapons, and power plant produced radionuclides in environmental samples collected from the Chesapeake Bay in the vicinity of the Calvert Cliffs Nuclear Power Plant (CCNPP) and from the Susquehanna River-Chesapeake Bay system in the vicinity of Peach Bottom Atomic Power Station (PBAPS). The purpose of this monitoring is to determine the fate, transport, and potential effects of power plant-produced radionuclides. This report contains a description of monitoring activities and data collected during the 1996 and 1997 calendar years. Radionuclide concentrations in shellfish, finfish, aquatic vegetation, and sediment were measured using high-resolution gamma spectrometry. Radionuclides in environmental samples originated from natural sources, historic atmospheric weapons testing, and normal operations of CCNPP and PBAPS

  12. On the Construction of Mohr Stress Circle and a Graphic Method in Representing the Stress Components on Different Oblique Planes

    Institute of Scientific and Technical Information of China (English)

    Zhubin He; Z. R. Wang; Kunpeng Kang

    2004-01-01

    The Mohr stress circle for three-dimensional stress is usually determined by equations,which is lack of intuitionistic meanings and difficult to understand. In this paper, the construction of Mohr stress circle is illustrated directly by numerical method. The shortcoming of Mohr stress circle in representing the stress components on different oblique planes for three-dimensional stress is analyzed. A three-dimensional figure is given to describe the variation of normal and shear stress on different oblique planes at one point for the first time.

  13. Impact of the DNA extraction method on 2-LTR DNA circle recovery from HIV-1 infected cells

    OpenAIRE

    Badralmaa, Yunden; Natarajan, Ven

    2013-01-01

    Detection of episomal 2-LTR DNA circles is used as a marker for the ongoing virus replication in patients infected with HIV-1, and efficient extraction of episomal DNA is critical for accurate estimation of the 2-LTR circles. The impact of different methods of DNA extraction on the recovery of 2-LTR circles was compared using mitochondrial DNA extracted as an internal control. The bacterial plasmid DNA isolation method extracted less than 10% of cellular DNA, 40% of mitochondrial DNA and 12-2...

  14. A Remark on P ´al Type Interpolation on Non-Uniformly Distributed Nodes on the Unit Circle

    Institute of Scientific and Technical Information of China (English)

    Neha Mathur; P.Mathur

    2014-01-01

    In this paper we study the problem of explicit representation and conver-gence of P ´al type (0;1) interpolation and its converse, with some additional conditions, on the non-uniformly distributed nodes on the unit circle obtained by projecting the interlaced zeros of Pn(x) and P′n(x) on the unit circle. The motivation to this problem can be traced to the recent studies on the regularity of Birkhoff interpolation and P ´al type interpolations on non-uniformly distributed zeros on the unit circle.

  15. NONMETALS DEPOSITS

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    <正>20111761 Chen Hua(115 Geological Party,Guizhou Bureau of Geology and Mineral Exploration & Development,Guiyang 551400,China);Deng Chao Analysis on the Metallogenic Environment of Maochang Bauxite in Guizhou Province(Guizhou Geology,ISSN1000-5943,CN52-1059/P,27(3),2010,p.198-201,2 illus.,1 table,8 refs.)Key words:bauxite deposit,Guizhou Province By long time physical and chemical process,the carbonate rock after Central Guizhou uplidft,becomes red clay,after further weathering,the red clay decomposed into the oxide,hydroxide of Al and Fe,in the dissolution hole and depression,it concentrates primary fragmentary tight and earthy karst bauxite ore.Because the variation of landform,it decomposes and cracks again,affords the material source

  16. Pythagorean hodograph spline spirals that match G3 Hermite data from circles

    KAUST Repository

    Li, Zhong

    2015-04-01

    A construction is given for a G3 piecewise rational Pythagorean hodograph convex spiral which interpolates two G3 Hermite data associated with two non-concentric circles, one being inside the other. The spiral solution is of degree 7 and is the involute of a G2 convex curve, referred to as the evolute solution, with prescribed length, and composed of two PH quartic curves. Conditions for G3 continuous contact with circles are then studied and it turns out that an ordinary cusp at each end of the evolute solution is required. Thus, geometric properties of a family of PH polynomial quartics, allowing to generate such an ordinary cusp at one end, are studied. Finally, a constructive algorithm is described with illustrative examples.

  17. New configuration factor between a circle, a sphere and a differential area at random positions

    International Nuclear Information System (INIS)

    In this Note, a configuration factor between a circle and the three coordinate directions is presented. This new factor brings considerable independence and versatility to radiative transfer analysis as it allows determining the radiative energy for points lying on a plane at an arbitrary position. By virtue of the radiation vector theory, the calculation is performed whether the angles that the plane forms with the coordinate directions are known. If the said plane cuts the disk in two halves a new factor is also presented for the radiant interchange between a half disk and a differential element. Besides, by extension of the case of the circle, the view factor between a sphere and a differential element in a random position is deducted. -- Highlights: •Mathematical treatment of circular and semicircular emitters. •Mathematical treatment of spherical emitters. •Mathematical support for computer simulation software. •New configuration factor for semicircular emitters

  18. Nano rolling-circle amplification for enhanced SERS hot spots in protein microarray analysis.

    Science.gov (United States)

    Yan, Juan; Su, Shao; He, Shijiang; He, Yao; Zhao, Bin; Wang, Dongfang; Zhang, Honglu; Huang, Qing; Song, Shiping; Fan, Chunhai

    2012-11-01

    Although "hot spots" have been proved to contribute to surface enhanced Raman scattering (SERS), less attention was paid to increase the number of the "hot spot" to directly enhance the Raman signals in bioanalytical systems. Here we report a new strategy based on nano rolling-circle amplification (nanoRCA) and nano hyperbranched rolling-circle amplification (nanoHRCA) to increase "hot spot" groups for protein microarrays. First, protein and ssDNA are coassembled on gold nanoparticles, making the assembled probe have both binding ability and hybridization ability. Second, the ssDNAs act as primers to initiate in situ RCA reaction to produced long ssDNAs. Third, a large number of SERS probes are loaded on the long ssDNA templetes, allowing thousands of SERS probes involved in each biomolecular recognition event. The strategy offered high-efficiency Raman enhancement and could detect less than 10 zeptomolar protein molecules in protein microarray analysis. PMID:23046056

  19. NanoCluster Beacons as Reporter Probes in Rolling Circle Enhanced Enzyme Activity Detection†

    Science.gov (United States)

    Juul, Sissel; Obliosca, Judy M.; Liu, Cong; Liu, Yen-Liang; Chen, Yu-An; Imphean, Darren M.; Knudsen, Birgitta R.; Ho, Yi-Ping; Leong, Kam W.; Yeh, Hsin-Chih

    2015-01-01

    As a newly developed assay for the detection of endogenous enzyme activity at the single-catalytic-event level, Rolling Circle Enhanced Enzyme Activity Detection (REEAD) has been used to measure enzyme activity in both single human cells and malaria-causing parasites, Plasmodium sp.. Current REEAD assays rely on organic dye-tagged linear DNA probes to report the rolling circle amplification products (RCPs), the cost of which may hinder the widespread use of REEAD. Here we show that a new class of activatable probes, NanoCluster Beacons (NCBs), can simplify the REEAD assays. Easily prepared without any need for purification and capable of large fluorescence enhancement upon hybridization, NCBs are cost-effective and sensitive. Compared to conventional fluorescent probes, NCBs are also more photostable. As demonstrated in reporting the human topoisomerases I (hTopI) cleavage-ligation reaction, the proposed NCBs suggest a read-out format attractive for future REEAD-based diagnostics. PMID:25901841

  20. Mode-locking in an infinite set of coupled circle maps

    International Nuclear Information System (INIS)

    We show that the mode-locking in coupled circle maps with random phases is very different from that in a single circle map. A finite nonlinearity Kc is needed for a step to appear. The width of the step behaves as (K-Kc)2. The complete mode-locking (at K=1 for uncoupled maps) behaves singularly as the coupling is turned on. We argue that our model describes the mode-locking in charge-density-wave materials. Our results are in qualitative agreement with experimental observations by Sherwin and Zettl that only few true steps exist in I-V characteristics and that in addition to these there are some 'incomplete' steps. (orig.)

  1. Bells Galore: Oscillations and circle-map dynamics from space-filling fractal functions

    Energy Technology Data Exchange (ETDEWEB)

    Puente, C.E.; Cortis, A.; Sivakumar, B.

    2008-10-15

    The construction of a host of interesting patterns over one and two dimensions, as transformations of multifractal measures via fractal interpolating functions related to simple affine mappings, is reviewed. It is illustrated that, while space-filling fractal functions most commonly yield limiting Gaussian distribution measures (bells), there are also situations (depending on the affine mappings parameters) in which there is no limit. Specifically, the one-dimensional case may result in oscillations between two bells, whereas the two-dimensional case may give rise to unexpected circle map dynamics of an arbitrary number of two-dimensional circular bells. It is also shown that, despite the multitude of bells over two dimensions, whose means dance making regular polygons or stars inscribed on a circle, the iteration of affine maps yields exotic kaleidoscopes that decompose such an oscillatory pattern in a way that is similar to the many cases that converge to a single bell.

  2. An Investigation of Seventh Grade Students’ Performances on Conceptual, Procedural and Graphical Problems Regarding Circles

    Directory of Open Access Journals (Sweden)

    Lütfi İncikabı

    2015-04-01

    Full Text Available The purpose of this study is to determine seventh grade students’ preferences among the procedural, conceptual and graphical questions in the subject of circles, to define their success levels in their preferences, and to compare students’ success levels in one question type with their performances in other question types. The methodology adopted during this research was case study. Based on criterion-based purposive sampling strategy, 98 middle school students were selected as the participants. Data were collected through an achievement test consisting of nine questions (three per question type. The results obtained from the study indicated that students mostly preferred graphical question types. Moreover, majority of students could not succeeded high levels in their preferred question types. In addition, the students performed better in graphical question types; however, the failure in procedural question types was remarkable. Keywords: Multiple representations, middle school students, mathematics education, circles

  3. Construction of symplectic structures on 4-manifolds with a free circle action

    CERN Document Server

    Friedl, Stefan

    2011-01-01

    Let $M$ be a closed 4-manifold with a free circle action. If the orbit manifold $N^3$ satisfies an appropriate fibering condition, then we show how to represent a cone in $H^2(M;\\R)$ by symplectic forms. This generalizes earlier constructions by Thurston, Bouyakoub and Fern\\'andez-Gray-Morgan. In the case that $M$ is the product 4-manifold $S^1\\times N$ our construction complements the results of \\cite{FV08} (arXiv:0805:1234 [math.GT]) and allows us to completely determine the symplectic cone of such 4-manifolds. The content of this paper partly overlaps with the content of the unpublished preprint "Symplectic 4-manifolds with a free circle action" (arXiv:0801.1313 [math.GT]).

  4. Peak Trekking of Hierarchy Mountain for the Detection of Cerebral Aneurysm using Modified Hough Circle Transform

    OpenAIRE

    Mitra, Jubin; Chandra, Abhijit; Halder, Tanmay

    2013-01-01

    The Circle of Willis is in the junction of two carotid arteries and two vertebral arteries that supply the brain with nutrition. Junctions where these arteries come together may develop weak spots that can balloon out and fill with blood, creating aneurysms. These sac-like areas may leak or rupture, spilling blood into surrounding tissues which may cause artery spasm leading to potential stroke or even death. Clipping and coiling are two treatment options preferred by neurosurgeon which requi...

  5. On the notion of "von Neumann vicious circle" coined by John Backus

    OpenAIRE

    Ambroszkiewicz, Stanislaw

    2016-01-01

    "The von Neumann vicious circle" means that non-von Neumann computer architectures cannot be developed because of the lack of widely available and effective non-von Neumann languages. New languages cannot be created because of lack of conceptual foundations for non-von Neumann architectures. The reason is that programming languages are high-level abstract isomorphic copies of von Neumann computer architectures. This constitutes the current paradigm in Computer Science. The paradigm is equival...

  6. Review of Barrow Hill: Curse of the Ancient Circle PC Game

    OpenAIRE

    Michael Charno

    2007-01-01

    Archaeological video games are few and far between. Internet Archaeology has reviewed a number of archaeologically-based computer applications, but none that in my opinion would fall under the video game category. Barrow Hill: Curse of the ancient circle from Shadow Tor Studios, is a video game…with archaeology in it. It would be a stretch to claim that Barrow Hill is actually an archaeological video game, but it does have an occasionally solid archaeological foundation and back story.

  7. Child protection network and the intersector implementation of the circle of security as alternatives to medication☆

    OpenAIRE

    Ana Laura Martins M.M. Becker; Souza, Paulo Haddad de; Oliveira, Mônica Martins de; Paraguay, Nestor Luiz Bruzzi B.

    2014-01-01

    Objectives: To describe the clinical history of a child with aggressive behavior and recurring death-theme speech, and report the experience of the team of authors, who proposed an alternative to medication through the establishment of a protection network and the inter-sector implementation of the circle of security concept. Case description: A 5-year-old child has a violent and aggressive behavior at the daycare. The child was diagnosed by the healthcare center with depressive disorder and ...

  8. On Linear Combinations of Two Orthogonal Polynomial Sequences on the Unit Circle

    Directory of Open Access Journals (Sweden)

    Suárez C

    2010-01-01

    Full Text Available Let be a monic orthogonal polynomial sequence on the unit circle. We define recursively a new sequence of polynomials by the following linear combination: , , . In this paper, we give necessary and sufficient conditions in order to make be an orthogonal polynomial sequence too. Moreover, we obtain an explicit representation for the Verblunsky coefficients and in terms of and . Finally, we show the relation between their corresponding Carathéodory functions and their associated linear functionals.

  9. Investigating the Use of Circle in Gear Cutting as a Substitute to Involute Profile

    Directory of Open Access Journals (Sweden)

    A.D. Kibet

    2012-05-01

    Full Text Available Gears are used in various machines and industries for transportation and transmission of power. Other uses are in consumer electronics and many machines used in homes like the washing machines, electric drills and kitchen appliances. Gears come in different sizes ranging from a module of 0.5 to 100 mm. Currently there is a problem of accurately machining gears. This is due to inaccurate positioning of the blank and cutter. The objective of the study was to investigate and determine the appropriate way of producing quality and accurate gears most economically through the use of a circle as a substitute to involute profile in gear cutting. Two different gears of same dimensional characteristics were cut; one using a Computer Numerical Control machine utilizing circle profile and the other using conventional milling machine. Dimensional comparisons were made of the two cut gears against an actual involute profile to determine the margin of error. The circle involute profile made using CNC was found to be exactly as the true involute profile though an error of 0.078 mm was observed in some sections of the profile. For the hobbing case, it was impossible to accurately machine the actual depth and as such, the intended depth of 7.32 was surpassed by 0.2 mm. The tooth was thicker throughout the length of the profile and the fillet radii lucked homogeneity. The involute circle approach was therefore successful and as such can benefit all CNC users and gear cutters in producing accurate gears cheaply.

  10. PHACE(S) Syndrome With Absent Intracranial Internal Carotid Artery and Anomalous Circle of Willis.

    Science.gov (United States)

    Winter, Pieta R; Itinteang, Tinte; Leadbitter, Philip; FitzJohn, Trevor; Tan, Swee T

    2015-06-01

    The authors present a case of PHACE(S) (posterior fossa malformations, hemangioma, arterial anomalies, cardiac defects, eye anomalies, and sternal cleft or supraumbilical raphe) syndrome with a right-sided segmental infantile hemangioma, and describe in detail, the associated absent ipsilateral intracranial internal carotid artery and anomalous Circle of Willis. Propranolol therapy led to accelerated, complete involution. Nadolol may reduce the theoretical risk of treating PHACE(S) patients with β-blockers. PMID:26080245

  11. Picard-Fuchs Equation and Prepotential of Five Dimensional SUSY Gauge Theory Compactified on a Circle

    OpenAIRE

    Kanno, Hiroaki; Ohta, Yuji

    1998-01-01

    Five dimensional supersymmetric gauge theory compactified on a circle defines an effective N=2 supersymmetric theory for massless fields in four dimensions. Based on the relativistic Toda chain Hamiltonian proposed by Nekrasov, we derive the Picard-Fuchs equation on the moduli space of the Coulomb branch of SU(2) gauge theory. Our Picard-Fuchs equation agrees with those from other approaches; the spectral curve of XXZ spin chain and supersymmetric cycle in compactified M theory. By making use...

  12. Directed percolation criticality due to Stochastic switching between Inhibitory and Excitatory Coupling in Coupled Circle maps

    OpenAIRE

    Sonawane, Abhijeet R.

    2010-01-01

    We study a lattice model where the coupling stochastically switches between repulsive (subtractive) and attractive (additive) at each site with probability p at every time instance. We observe that such kind of coupling stabilizes the local fixed point of a circle map, with the resultant globally stable attractor providing a unique absorbing state. Interestingly, a continuous phase transition is observed from the absorbing state to spatiotemporal chaos via spatiotemporal intermittency for a r...

  13. Recombination at Long Mutant Telomeres Produces Tiny Single- and Double-Stranded Telomeric Circles

    OpenAIRE

    Groff-Vindman, Cindy; Cesare, Anthony J.; Natarajan, Shobhana; Griffith, Jack D.; McEachern, Michael J.

    2005-01-01

    Recombinational telomere elongation (RTE) known as alternate lengthening of telomeres is the mechanism of telomere maintenance in up to 5 to 10% of human cancers. The telomeres of yeast mutants lacking telomerase can also be maintained by recombination. Previously, we proposed the roll-and-spread model to explain this elongation in the yeast Kluveromyces lactis. This model suggests that a very small (∼100-bp) circular molecule of telomeric DNA is copied by a rolling circle event to generate a...

  14. Peer Evaluation of Master Programs: Closing the Quality Circle of the CDIO Approach?

    OpenAIRE

    Hussmann, Peter Munkebo; Bisi, Anita; MALMQVIST, Johan; Carlsson, Birgitta; Lysne, Hilde; Högfeldt, Anna-Karin

    2012-01-01

    A quality assurance project was conducted within the framework of the Nordic Five Tech Alliance (N5T), astrategic alliance of the five leading technical universities in Denmark, Finland, Norway, and Sweden. Theproject concerned the development of a common quality enhancement tool for conducting peer evaluations ofeducational programs to enable their further development and close the quality circle. In addition, the projectwill contribute to the consolidation of the N5T alliance by facilitatin...

  15. Anti-racist cultural politics in post-imperial Britain: the New Beacon Circle

    OpenAIRE

    Alleyne, Brian

    2007-01-01

    This chapter explores the activist-pedagogy of one group that sought to negotiate an inclusive place in Britain for the descendants of Black and Brown migrants: New Beacon Circle, based in North London, England. Whereas many contributors to this book have addressed contemporary alternative educational initiatives, I consider one that started in the mid-1960s and is still active today. In this way, I emphasize the continuity in radical experimentation in utopian pedagogy. In the case of New Be...

  16. Evolving Landscape of Scholarly Communications in BC: cIRcle: a new Library 'Publishing' Service

    OpenAIRE

    Colenbrander, Hilde

    2008-01-01

    The evolving landscape of scholarly communications in British Columbia was explored from the perspectives of academic librarians and faculty. Members of the Canadian Association of research Libraries are building and filling institutional repositories so that their faculty can make their own work open access, something that funding agencies are increasingly expecting. Hilde Colenbrander presented on cIRcle, UBC Library's Institutional Repository, just out of pilot mode.

  17. Warp of the Invariant Circle and Onset of Chaos in Josephson Junction Equation

    Institute of Scientific and Technical Information of China (English)

    QIAN Min; WANG Jia-Zeng

    2007-01-01

    The dynamics of the dc and ac driving Josephson junction equation is studied in terms of the tvo-dimensional Poincaré map. The smooth invariant circle on the phase cylinder in over-damped case α > 2 loses smoothness as α decreases and becomes a strange attractor eventually. This triggers two kinds of chaos, one occurs in the regions between two Arnold tongues and the other occurs within the tongues.

  18. Discovery of fairy circles in Australia supports self-organization theory.

    Science.gov (United States)

    Getzin, Stephan; Yizhaq, Hezi; Bell, Bronwyn; Erickson, Todd E; Postle, Anthony C; Katra, Itzhak; Tzuk, Omer; Zelnik, Yuval R; Wiegand, Kerstin; Wiegand, Thorsten; Meron, Ehud

    2016-03-29

    Vegetation gap patterns in arid grasslands, such as the "fairy circles" of Namibia, are one of nature's greatest mysteries and subject to a lively debate on their origin. They are characterized by small-scale hexagonal ordering of circular bare-soil gaps that persists uniformly in the landscape scale to form a homogeneous distribution. Pattern-formation theory predicts that such highly ordered gap patterns should be found also in other water-limited systems across the globe, even if the mechanisms of their formation are different. Here we report that so far unknown fairy circles with the same spatial structure exist 10,000 km away from Namibia in the remote outback of Australia. Combining fieldwork, remote sensing, spatial pattern analysis, and process-based mathematical modeling, we demonstrate that these patterns emerge by self-organization, with no correlation with termite activity; the driving mechanism is a positive biomass-water feedback associated with water runoff and biomass-dependent infiltration rates. The remarkable match between the patterns of Australian and Namibian fairy circles and model results indicate that both patterns emerge from a nonuniform stationary instability, supporting a central universality principle of pattern-formation theory. Applied to the context of dryland vegetation, this principle predicts that different systems that go through the same instability type will show similar vegetation patterns even if the feedback mechanisms and resulting soil-water distributions are different, as we indeed found by comparing the Australian and the Namibian fairy-circle ecosystems. These results suggest that biomass-water feedbacks and resultant vegetation gap patterns are likely more common in remote drylands than is currently known. PMID:26976567

  19. Effects of Video Modeling on Implementation of Literature Circles in Inclusive Content Area Classrooms

    OpenAIRE

    Lisa A. Dieker; Chris O'Brien

    2008-01-01

    Trends in special education favor inclusion and concurrently the implementation of inclusive instructional practices. As students with learning disabilities are increasingly placed in general education classrooms, the need to assist general educators in establishing inclusive classrooms becomes a major priority. Cooperative learning, in the form of literature circles, is offered as a means of providing support to academically diverse student populations. In light of research-to-practice chall...

  20. Empirical Research on the Urban Development Level of Wuhan Urban Circle

    OpenAIRE

    Yazhou Xiong; Xianming Liu

    2013-01-01

    The research object of this paper is the nine cities of Wuhan urban circle. Firstly, this paper establishes the comprehensive evaluation indicator system and evaluation model of the urban development level via systems analysis, then makes a PCA (Principal Components Analysis) to the original data by means of SPSS; Next, this paper analyzes the worked data via AHP (Analytic Hierarchy Process) and comprehensive score and ranking of the nine cities is obtained and the nine cities are divided int...

  1. Sleep disturbances and post-traumatic stress disorder; a perpetual circle?

    OpenAIRE

    Liempt, S. van

    2012-01-01

    Background: Sleep facilitates the consolidation of fear extinction memory. Disrupted sleep has been proposed as a vulnerability factor for the development of posttraumatic stress disorder (PTSD). Moreover, nightmares and insomnia are hallmark symptoms of PTSD, possibly interfering with fear extinction and compromising recovery. A perpetual circle may develop when sleep increases the risk for PTSD, and PTSD leads to an increase of sleep disturbances. To date, therapeutic options for alleviatin...

  2. Social circles: a simple structure for agent-based social network models

    OpenAIRE

    Gilbert, GN; Hamill, L

    2009-01-01

    None of the standard network models fit well with sociological observations of real social networks. This paper presents a simple structure for use in agent-based models of large social networks. Taking the idea of social circles, it incorporates key aspects of large social networks such as low density, high clustering and assortativity of degree of connectivity. The model is very flexible and can be used to create a wide variety of artificial social worlds.

  3. Thermodynamic formalism and circle homeomorphisms with a break-type singularity

    International Nuclear Information System (INIS)

    A renormalization group (RG) transformation on the space of circle homeomorphisms with break-type singularity point and with the rotation number ρ=(√5-1)/2 ('golden mean') has a unique periodic trajectory {T1,T2} with period two. For homeomorphisms T which are C1-conjugate to T1 (or T2) the behavior of Holder's exponents of singular invariant measure are studied. Limit distributions of entrance times are also studied. (author)

  4. Numerical simulation of the blood flow behavior in the circle of Willis

    Directory of Open Access Journals (Sweden)

    Razavi Seyyed Esmail

    2014-06-01

    Full Text Available Introduction: This paper represents the numerical simulation of blood flow in the circle of Willis (CoW. Circle of Willis is responsible for the oxygenated blood distribution into the cerebral mass. To investigate the blood behavior, two Newtonian and non-Newtonian viscosity models were considered and the results were compared under steady state conditions. Methods: Methodologically, the arterial geometry was obtained using 3D magnetic resonance angiography (MRA data. The blood flow through the cerebral vasculature was considered to be steady and laminar, and the Galerkin’s finite element method was applied to solve the systems of non-linear Navier-Stokes equations. Results: Flow patterns including flow rates and shear rates were obtained through the simulation. The minimal magnitude of shear rates was much greater than 100 s-1 through the larger arteries; thus, the non-Newtonian blood viscosity tended to approach the constant limit of infinite shear viscosity through the CoW. So, in larger arteries the non-Newtonian nature of blood was less dominant and it would be treated as a Newtonian fluid. The only exception was the anterior communicating artery (ACoA in which the blood flow showed different behavior for the Newtonian and non-Newtonian cases. Conclusion: By comparing the results it was concluded that the Newtonian viscosity assumption of blood flow through the healthy, complete circle of Willis under the normal and steady conditions would be acceptably accurate.

  5. White Blood Cell Segmentation by Circle Detection Using Electromagnetism-Like Optimization

    Directory of Open Access Journals (Sweden)

    Erik Cuevas

    2013-01-01

    Full Text Available Medical imaging is a relevant field of application of image processing algorithms. In particular, the analysis of white blood cell (WBC images has engaged researchers from fields of medicine and computer vision alike. Since WBCs can be approximated by a quasicircular form, a circular detector algorithm may be successfully applied. This paper presents an algorithm for the automatic detection of white blood cells embedded into complicated and cluttered smear images that considers the complete process as a circle detection problem. The approach is based on a nature-inspired technique called the electromagnetism-like optimization (EMO algorithm which is a heuristic method that follows electromagnetism principles for solving complex optimization problems. The proposed approach uses an objective function which measures the resemblance of a candidate circle to an actual WBC. Guided by the values of such objective function, the set of encoded candidate circles are evolved by using EMO, so that they can fit into the actual blood cells contained in the edge map of the image. Experimental results from blood cell images with a varying range of complexity are included to validate the efficiency of the proposed technique regarding detection, robustness, and stability.

  6. White Blood Cell Segmentation by Circle Detection Using Electromagnetism-Like Optimization

    Science.gov (United States)

    Oliva, Diego; Díaz, Margarita; Zaldivar, Daniel; Pérez-Cisneros, Marco; Pajares, Gonzalo

    2013-01-01

    Medical imaging is a relevant field of application of image processing algorithms. In particular, the analysis of white blood cell (WBC) images has engaged researchers from fields of medicine and computer vision alike. Since WBCs can be approximated by a quasicircular form, a circular detector algorithm may be successfully applied. This paper presents an algorithm for the automatic detection of white blood cells embedded into complicated and cluttered smear images that considers the complete process as a circle detection problem. The approach is based on a nature-inspired technique called the electromagnetism-like optimization (EMO) algorithm which is a heuristic method that follows electromagnetism principles for solving complex optimization problems. The proposed approach uses an objective function which measures the resemblance of a candidate circle to an actual WBC. Guided by the values of such objective function, the set of encoded candidate circles are evolved by using EMO, so that they can fit into the actual blood cells contained in the edge map of the image. Experimental results from blood cell images with a varying range of complexity are included to validate the efficiency of the proposed technique regarding detection, robustness, and stability. PMID:23476713

  7. Linear Determination of a Camera's Intrinsic Parameters Using Two Intersecting Circles

    Directory of Open Access Journals (Sweden)

    Xu Chen

    2014-03-01

    Full Text Available An approach using two intersecting circles is proposed as a linear approach for determining a camera's intrinsic parameters. The two intersecting coplanar circles have four intersection points in the projective plane: two real points and two circular points. In the image plane, the diagonal triangle - on which the image of the four intersection points composes a complete quadrangle - is a self-polar triangle for the projection curves of the circles. The vertex of the self-polar triangle is the null space of the degenerate conic formed by the image of the four intersection points. By solving the three vertices of the self-polar triangle using the image coordinates of the two real intersection points, the degenerate conic can be obtained. The image of the two circular points is then computed from the intersection points of the degenerate conic. Using the image of the circular points from the three images of the same planar pattern with different directions, the intrinsic parameters can be linearly determined.

  8. Design of Circle Array Pattern for Transparent Nanomesh-Type Electrodes.

    Science.gov (United States)

    Shin, Seungsu; Ganorkar, Shraddha; Kim, Jungyoon; Kim, Young-Hwan; Kim, Yong Tae; Kim, Seong-Il

    2015-10-01

    In this study, we report simulation results for the optical properties of nanomesh-type electrodes for transparent electrode. Usually, indium tin oxide (ITO) is commonly used for transparent conductor to solar cell, display, LED and other electronic modules. However, the cost is high due to the rarity of indium. An alternative way is use of transparent nanomesh-type metal electrode for solar cell. Finite different time domain (FDTD) method was used to simulate and analyze their optical properties. Various array patterns (square, circle and circle hexagonal array) of metal on glass (SiO2) substrates were designed and their properties of transmission and reflection were simulated by using the broad band (λ = 300~1200 nm) plane wave source. To compare basic characteristics of each pattern, various structural parameters such as hole diameter, pitch and metal thickness were applied. The effect of three typical metals, such as Ag, Au, and Al was also compared. In the results, we will discuss about large dip of transmission appeared at the particular wavelength region from the circle array pattern, which is design with pitch of 500 nm at the wavelength range 700 to 800 nm. The surface plasmonpolaritons (SPP) effect can be the cause of large dip and we could find a broad and high transmission from the properly designed in nanomesh-type electrodes, which was calculated as a function of wavelength. PMID:26726388

  9. Adaptive circle-ellipse fitting method for estimating tree diameter based on single terrestrial laser scanning

    Science.gov (United States)

    Bu, Guochao; Wang, Pei

    2016-04-01

    Terrestrial laser scanning (TLS) has been used to extract accurate forest biophysical parameters for inventory purposes. The diameter at breast height (DBH) is a key parameter for individual trees because it has the potential for modeling the height, volume, biomass, and carbon sequestration potential of the tree based on empirical allometric scaling equations. In order to extract the DBH from the single-scan data of TLS automatically and accurately within a certain range, we proposed an adaptive circle-ellipse fitting method based on the point cloud transect. This proposed method can correct the error caused by the simple circle fitting method when a tree is slanted. A slanted tree was detected by the circle-ellipse fitting analysis, then the corresponding slant angle was found based on the ellipse fitting result. With this information, the DBH of the trees could be recalculated based on reslicing the point cloud data at breast height. Artificial stem data simulated by a cylindrical model of leaning trees and the scanning data acquired with the RIEGL VZ-400 were used to test the proposed adaptive fitting method. The results shown that the proposed method can detect the trees and accurately estimate the DBH for leaning trees.

  10. Influence of "Holiday Tourism Circle of Beijing" on Chengde Tourism Spatial Alteration and Reconstruction

    Institute of Scientific and Technical Information of China (English)

    Li Chen; Cheng Shengkui; Chen Yuansheng; Zhang Yingqiu

    2006-01-01

    Chengde City, famous for its cultural sightseeing tourism industry, and is located in China's "Capital Holiday Tourism Circle". This location is advantageous, because of the recent boom in China's national tourism industry. This industry has gone through several structural and development changes with in the past several years. A result of these restructuring patterns is the great changes concerning competitive and cooperative relations among tourism destinations, which have precipitated the decline of the traditional sightseeing pattern.Northern China's "Capital Holiday Tourism Circle" is one of nine key areas within the Chinese tourism industry under development during the Eleventh Five-Year Plan. In the present article the method of "Distance Decline of The Tourist Flow" was used to define the flow of tourists in the Capital Holiday Tourism Circle and its influence upon Chengde's tourism spatial distribution. 3 aspects will be discussed: (1) The transformation from sightseeing to leisure markets makes the change possible in Chengde's tourism spatial pattern. (2) The location advantage (adjacent to Beijing and Tianjin) also leads to the change in Chengde tourism spatial pattern. (3) The establishment of freeways also contributes to a great degrees of change.The rapid development of leisure tourism might lead to the change from nucleus model to a diversified one within Chengde's tourism. Specifically, Chengde is developing the tourism industry with the central heritage area as the nucleus and the northern forest,pasture,southern mountain, and rivers as its periphery.

  11. Transformation brackets between U(N)contains SO(N)contains SO(Na)circle-plus SO(Nb) and U(N)contains U(Na)circle-plus U(Nb)contains SO(Na)circle-plus SO(Nb)

    International Nuclear Information System (INIS)

    Transformation brackets between U(N)contains SO(N)contains SO(Na)circle-plus SO(Nb) and U(N)contains U(Na)circle-plus U(Nb)contains SO(Na)circle-plus SO(Nb) for symmetric U(N) irreducible representations are derived for Na, Nb≥2 by using bispherical coordinates in N=Na+Nb dimensions and a convolution identity for generalized Laguerre polynomials. The formula derived for the transformation brackets also applies to the special cases with Na≥2, Nb=1 and Na=1, Nb≥2. copyright 1997 American Institute of Physics

  12. Improving Self-Esteem of Women Offenders through Process-based Writing in a Learning Circle: An Exploratory Study.

    Science.gov (United States)

    Stino, Zandra H.; Palmer, Barbara C.

    1998-01-01

    Over 18 weeks, nine female offenders worked in a collaborative learning circle with process-based writing (prewriting, drafting, sharing, revising, editing, proofreading, publishing). Most showed a significant increase in self-esteem. (SK)

  13. "Really," "Not Possible," "I Can't Believe It": Exploring Informational Text in Literature Circles

    Science.gov (United States)

    Barone, Diane; Barone, Rebecca

    2016-01-01

    Fifth graders' interpretations of nonfiction or informational text were explored. Each literature circle group read and responded to informational text. Discoveries included that students' conversations and written responses were closely connected to text and that students created multimodal responses.

  14. Microstructural asymmetry of the corticospinal tracts predicts right-left differences in circle drawing skill in right-handed adolescents

    DEFF Research Database (Denmark)

    Angstmann, Steffen; Madsen, Kathrine Skak; Skimminge, Arnold;

    2016-01-01

    imaging at 3 Tesla. The right and left CST were defined as regions-of-interest and mean fractional anisotropy (FA) and diffusivity values were calculated for right and left CST. On average, mean FA values were higher in the left CST relative to right CST. The degree of right-left FA asymmetry showed a...... of circle drawing movements was assessed for each hand using a digitizing tablet. Although all participants were right-handed, there was substantial inter-individual variation regarding the relative right-hand advantage for fluent circle drawing. All subjects underwent whole-brain diffusion tensor...... linear relationship with right-left asymmetry in fluent circle drawing after correction for age and gender. The higher the mean FA values were in the left dominant CST relative to the right non-dominant CST, the stronger was the relative right-hand advantage for regular circle drawing. These findings...

  15. A Peculiarly Cerebroid Convex Zygo-Dodecahedron is an Axiomatically Balanced “House of Blues”: The Circle of Fifths to the Circle of Willis to Cadherin Cadenzas

    Directory of Open Access Journals (Sweden)

    David A. Becker

    2012-11-01

    Full Text Available A bilaterally symmetrical convex dodecahedron consisting of twelve quadrilateral faces is derived from the icosahedron via a process akin to Fuller’s Jitterbug Transformation. The unusual zygomorphic dodecahedron so obtained is shown to harbor a bilaterally symmetrical jazz/blues harmonic code on its twelve faces that is related to such fundamental music theoretical constructs as the Circle of Fifths and Euler’s tonnetz. Curiously, the patterning within the aforementioned zygo-dodecahedron is discernibly similar to that observed in a ventral view of the human brain. Moreover, this same pattern is arguably evident during development of the embryonic pharynx. A possible role for the featured zygo-dodecahedron in cephalogenesis is considered. Recent studies concerning type II cadherins, an important class of proteins that promote cell adhesion, have generated data that is demonstrated to conform to this zygo-dodecahedral brain model in a substantially congruous manner.

  16. Family Circle

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Foster care is conducive to giving orphaned children a better life For most children living in orphanages, having a real home is just a pipe dream. Although they may be well looked after, receive a good education and proper nutrition, the love and care that come from being part of a real family just aren't there.

  17. Pronunciation Issues and Varieties of English from an EIL Perspective: A Survey of Outer and Expanding Circle Learners’ Beliefs

    Directory of Open Access Journals (Sweden)

    Abbas Monfared

    2014-11-01

    Full Text Available In a globalized era where English keeps the position of an international language, learnt and spoken by lots of people from diverse linguistic, cultural and national backgrounds, there is a need for a new perspective towards English as an international language which can bridge notions and cultures. The appearance of varieties of English is the consequence of the global dissemination of English. Based on a combination of quantitative and qualitative data using a semi-structured questionnaire (see Appendix A administered to 60 Iranian learners from expanding circle and 60 Indian learners from outer circle, this study surveyed the developing picture of EIL pronunciation and evaluation of different varieties of English from the perspective of learners from two circles which include the most users of English in the globalized world. The results of the questionnaires supplemented by interviews with leaners from expanding and outer circles revealed that expanding-circle learners like more to have a native-like identity with their preference towards nativism. The implications on the findings on the spread of native speaker norms and the status of ELF and its reflections in learning and teaching in expanding and outer circle countries are discussed. Keywords: Pronunciation, Intelligibility, English as an International language, Language Awareness, Identity

  18. 'Anomaly' in n = ∞ Alday-Maldacena duality for wavy circle

    International Nuclear Information System (INIS)

    If the Alday-Maldacena version of string/gauge duality is formulated as an equivalence between double loop and area integrals a la arXiv: 0708.1625, then this pure geometric relation can be tested for various choices of n-side polygons. The simplest possibility arises at n = ∞, with polygon substituted by an arbitrary continuous curve. If the curve is a circle, the minimal surface problem is exactly solvable. If it infinitesimally deviates from a circle, then the duality relation can be studied by expanding in powers of a small parameter. In the first approximation the Nambu-Goto (NG) equations can be linearized, and the peculiar NG Laplacian ΔNG = Δ0-D2+D plays the central role. Making use of explicit zero-modes of this operator (NG-harmonic functions), we investigate the geometric duality in the lowest orders for small deformations of arbitrary shape lying in the plane of the original circle. We find a surprisingly strong dependence of the minimal area on regularization procedure affecting 'the boundary terms' in minimal area. If these terms are totally omitted, the remaining piece is regularization independent, but still differs by simple numerical factors like 4 from the double-loop integral which represents the BDS formula so that we stop short from the first non-trivial confirmation of the Alday-Maldacena duality. This confirms the earlier-found discrepancy for two parallel lines at n = ∞, but demonstrates that it actually affects only a finite number (out of infinitely many) of parameters in the functional dependence on the shape of the boundary, and the duality is only slightly violated, which allows one to call this violation an anomaly.

  19. Genomic insertion of lentiviral DNA circles directed by the yeast Flp recombinase

    Directory of Open Access Journals (Sweden)

    Yáñez-Muñoz Rafael J

    2008-08-01

    Full Text Available Abstract Background Circular forms of viral genomic DNA are generated during infection of cells with retroviruses like HIV-1. Such circles are unable to replicate and are eventually lost as a result of cell division, lending support to the prevalent notion that episomal retroviral DNA forms are dead-end products of reverse transcription. Results We demonstrate that circular DNA generated during transduction with HIV-1-based lentiviral vectors can be utilized as substrate for gene insertion directed by nonviral recombinases co-expressed in the target cells. By packaging of lentiviral genomic RNA in integrase-defective lentiviral vectors, harboring an inactive form of the viral integrase, the normal pathway for viral integration is blocked and circular vector DNA accumulates in transduced cells as a result. We find that the amount of DNA circles is increased 4-fold in cells transduced with integration-defective vectors relative to cells treated with integrase-proficient vectors. By transduction of target cells harboring engineered recognition sites for the yeast Flp recombinase with integration-defective lentiviral vectors containing an ATG-deficient hygromycin B selection gene we demonstrate precise integration of lentiviral vector-derived DNA circles in a drug-selective approach. Moreover, it is demonstrated that trans-acting Flp recombinase can be delivered by Flp-encoding transfected plasmid DNA or, alternatively, by co-transduced integrase-defective lentiviral vectors carrying a Flp expression cassette. Conclusion Our data provide proof-of-principle that nonviral recombinases, like Flp, produced by plasmid DNA or non-integrating lentiviral vectors can gain access to circular viral recombination substrates and facilitate site-directed genomic insertion of such episomal DNA forms. Replacement of the normal viral integration machinery with nonviral mediators of integration represents a new platform for creation of lentiviral vectors with an

  20. An innovative integrated oxidation ditch with vertical circle(IODVC) for wastewater treatment

    Institute of Scientific and Technical Information of China (English)

    XIA Shi-bin; LIU Jun-xin

    2004-01-01

    The oxidation ditch process is economic and efficient for wastewater treatment, but its application is limited in case where land is costly due to its large land area required. An innovative integrated oxidation ditch with vertical circle(IODVC) system was developed to treat domestic and industrial wastewater aiming to save land area. The new system consists of a single-channel divided into two ditches(the top one and the bottom one by a plate), a Kesner type brush, and an innovative integral clarifier. Different from the horizontal circle of the conventional oxidation ditch, the flow of IODVC system recycles from the top zone to the bottom zone in the vertical circle as the brush is running, and then the IODVC saved land area required by about 50% compared with a conventional oxidation ditch with an intrachannel clarifier. The innovative integral clarifier is effective for separation of liquid and solids, and is preferably positioned at the opposite end of the brush in the ditch. It does not affect the hydrodynamic characteristics of the mixed liquor in the ditch, and the sludge can automatically return to the down ditch without any pump. In this study, experiments of domestic and dye wastewater treatment were carried out in bench scale and in full scale, respectively. Results clearly showed that the IODVC efficiently removed pollutants in the wastewaters, i.e., the average of COD removals for domestic and dye wastewater treatment were 95% and 90%, respectively, and that the IODVC process may provide a cost effective way for full scale dye wastewater treatment.

  1. Local Circles in a Circular Economy – the Case of Smartphone Repair in Denmark

    Directory of Open Access Journals (Sweden)

    Henrik Riisgaard

    2016-02-01

    Full Text Available Abstract Circular economy has gained increasing attention the last decade, and more often the main focus is on the large  global circles addressing recycling of materials rather than the “inner circles” that address maintenance/repair and reuse. In this article we investigate one such inner circle ofthe circular economy namely repair of smartphones which extends the lifetime of products and adds to a local economy. Local repair of smartphones has increased in the resent years in Denmark. These loop-closing businesses not only extend the useful lifetime of smartphones; they also entail both environmental benefits and economic value creation. We map the extent ofthe repair sector and investigate the drivers and barriers for its emergence. The study builds on desk studies for identification of repair companiesand telephone interviews with 33 out of 90 identified companies. The mapping of the businessesshows that the repair of smartphones constitute viable business opportunities, and that the main driversarerelated to the economic business potentials as well as motivated entrepreneurs who spot a market potential.The study concludes that the local circular economy within smartphone repair is due to large consumer willingness-to-pay for repair and maintenance services, and this can extend the lifetime of the smartphones. There are some special characteristics that limit the possibility to apply the results directly to other product groups, but further analysis of how to facilitate repair shops within other product groups are interesting in order to facilitate the development of local circles in a circular economy not only in Denmark but also in other countries.   Keywords: Circular economy; Smartphone;Repair; Remanufacturing. 

  2. [From Comte to Carnap. Marcel Boll and the introduction of the Vienna Circle in France].

    Science.gov (United States)

    Schöttler, Peter

    2015-01-01

    The issue of the introduction of viennese "scientific philosophy" in France appears to be resolved. However, the rediscovery of the positivist physicist Marcel Boll (1886-1971), who was the first-well before Louis Rougier-to draw the French public's attention to the works of Schlick, Frank, and Carnap, obliges us to rethink the passage from traditional positivism to neo-positivism during the 1920s and 1930s. The French reception of the Vienna circle can be dated earlier than accepted and is more profound than usualy assumed. PMID:25914078

  3. Aircraft Detection from VHR Images Based on Circle-Frequency Filter and Multilevel Features

    Directory of Open Access Journals (Sweden)

    Feng Gao

    2013-01-01

    Full Text Available Aircraft automatic detection from very high-resolution (VHR images plays an important role in a wide variety of applications. This paper proposes a novel detector for aircraft detection from very high-resolution (VHR remote sensing images. To accurately distinguish aircrafts from background, a circle-frequency filter (CF-filter is used to extract the candidate locations of aircrafts from a large size image. A multi-level feature model is then employed to represent both local appearance and spatial layout of aircrafts by means of Robust Hue Descriptor and Histogram of Oriented Gradients. The experimental results demonstrate the superior performance of the proposed method.

  4. The Increased Production Efficiency and Optimization Terms of Stationarity by Flat Grinding with Abrasive Circle Surface

    Directory of Open Access Journals (Sweden)

    Husseinov Hassan Ahmad

    2014-01-01

    Full Text Available This scientific work deals with the production area. The paper investigates the problems related to the uneven abrasive effect on the processed surface by flat grinding with the abrasive circle surface, and the analytical expression of pattern distribution of the working abrasive grain within the limits of various technological primitives and inaccuracy of geometric shape have been determined. The ways of stationary provision of the grinding surface have been suggested. This paper also focuses on the economic efficiency of the production.

  5. The "Dot in Circle" Sign on MRI in Maduramycosis: A Characteristic Finding

    Directory of Open Access Journals (Sweden)

    Vikash Jain

    2012-01-01

    Full Text Available Mycetoma or Maduramycosis is a localized chronic suppurative infection characterized by exuberant granulation tissue, discharging sinuses, and bone involvement later in the course of the disease. Early clinical diagnosis before the appearance of sinuses and grains (aggregates of organism surrounded by granulation tissue, which are discharged from the draining sinuses is difficult. Delay in diagnosis may lead to amputation of the affected part. Definitive diagnosis is through biopsy and microbiological examination. However, at times diagnosis may still be difficult. The recently described "dot in circle" sign on magnetic resonance imaging (MRI is easy to recognize and highly specific. We present a case of mycetoma foot with characteristic MRI features.

  6. Renormalization and 3-manifolds which fiber over the circle (AM-142)

    CERN Document Server

    McMullen, Curtis T

    2014-01-01

    Many parallels between complex dynamics and hyperbolic geometry have emerged in the past decade. Building on work of Sullivan and Thurston, this book gives a unified treatment of the construction of fixed-points for renormalization and the construction of hyperbolic 3- manifolds fibering over the circle. Both subjects are studied via geometric limits and rigidity. This approach shows open hyperbolic manifolds are inflexible, and yields quantitative counterparts to Mostow rigidity. In complex dynamics, it motivates the construction of towers of quadratic-like maps, and leads to a quantitativ

  7. Great Circle Distance Methode for Improving Operational Control System Based on GPS Tracking System

    Directory of Open Access Journals (Sweden)

    Benny Dwi Kifana

    2012-04-01

    Full Text Available Fleet monitoring conducted to determine the position of the movement of the fleet to a point of reference. There are three applications that are necessary for the implementation of the monitoring system. They are Global Positioning System (GPS, Geographic Information System (GIS and Global System for Mobile Communications (GSM technologies. The Great Circle Distance method with two equations, Vincenty and Haversine, is used to calculate the accurate positioning. The experiment results show that the use of the equation Vincenty have better performance in comparison to Haversine equationon overspeeding detection. Accuracy of monitoring is increasing as evidenced by increased frequency of position reporting.

  8. Probabilistic signatures of spatiotemporal intermittency in the coupled sine circle map lattice

    Indian Academy of Sciences (India)

    Zahera Jabeen; Neelima Gupta

    2008-06-01

    The phase diagram of the coupled sine circle map system exhibits a variety of interesting phenomena including spreading regions with spatiotemporal intermittency, non-spreading regions with spatial intermittency, and coherent structures termed solitons. A spreading to non-spreading transition is seen in the system. A cellular automaton version of the coupled system maps the spreading to non-spreading transition to a transition from a probabilistic to a deterministic cellular automaton. The solitonic sector of the system shows spatiotemporal intermittency with soliton creation, propagation and absorption. A probabilistic cellular automaton mapping is set up for this sector which can identify each one of these phenomena.

  9. Time of arrival operator on the circle. (Variations on two Mielnik's works)

    CERN Document Server

    Przanowski, M; Tosiek, J

    2012-01-01

    Using the orthodox Weyl -- Wigner -- Stratonovich -- Cohen (WWSC) quantization rule we construct a time -- of -- arrival operator for a free particle on the circle. It is shown that this operator is self -- adjoint but the careful analysis of its properties suggests that it cannot represent a `physical' time -- of -- arrival observable. The problem of a time -- of -- arrival observable for the `waiting screen' is also considered. A method of avoiding the quantum Zeno effect is proposed and the positive operator valued measure (POV -- measure) or the generalized positive operator valued measure (GPOV -- measure) describing quantum time -- of -- arrival observable for the waiting screen are found.

  10. Peer Evaluation of Master Programs: Closing the Quality Circle of the CDIO Approach?

    DEFF Research Database (Denmark)

    Hussmann, Peter Munkebo; Bisi, Anita; Malmqvist, Johan;

    2012-01-01

    A quality assurance project was conducted within the framework of the Nordic Five Tech Alliance (N5T), a strategic alliance of the five leading technical universities in Denmark, Finland, Norway, and Sweden. The project concerned the development of a common quality enhancement tool for conducting...... programs within their field at another N5T institution. The article describes the quality enhancement tool in detail, its contribution to the development of the involved programs, and how international peer evaluation can contribute to closing the quality circle. Finally, it assesses the value...

  11. Evaluation of flow dynamics in the circle of Willis with MR angiography

    International Nuclear Information System (INIS)

    This paper reports two- and three- dimensional MR angiography applied to the study of flow dynamics in the circle of Willis. Presaturation was applied to eliminate signal within the vascular territory supplied by a selected vessel, without affecting other vascular territories. The method was applied to two healthy subjects and 12 patients with cerebrovascular pathology. The results were correlated with those of transcranial Doppler sonography and angiography. MR imaging was able to identify collateral flow over the anterior and posterior communicating and ophthalmic arteries, filling of both pericallosal arteries from one side, and fetal posterior circulation. This technique permits noninvasive functional and morphologic analysis of the cerebrovascular system

  12. Rapid identification of bio-molecules applied for detection of biosecurity agents using rolling circle amplification.

    Directory of Open Access Journals (Sweden)

    Jenny Göransson

    Full Text Available Detection and identification of pathogens in environmental samples for biosecurity applications are challenging due to the strict requirements on specificity, sensitivity and time. We have developed a concept for quick, specific and sensitive pathogen identification in environmental samples. Target identification is realized by padlock- and proximity probing, and reacted probes are amplified by RCA (rolling-circle amplification. The individual RCA products are labeled by fluorescence and enumerated by an instrument, developed for sensitive and rapid digital analysis. The concept is demonstrated by identification of simili biowarfare agents for bacteria (Escherichia coli and Pantoea agglomerans and spores (Bacillus atrophaeus released in field.

  13. The Circle Of Security Parenting and parental conflict: a single case study

    OpenAIRE

    ChiaraPazzagli; FrancescaManaresi; BertPowell

    2014-01-01

    The Circle of Security Parenting (COS-P) is an early attachment based intervention that can be used with groups, dyads, and individuals. Created in the USA and now used in many countries, COS-P is a visually based approach that demonstrates its central principles through videos of parent/child interactions. The core purpose of the COS-P is to provide an opportunity for caregivers to reflect on their child’s needs and on the challenges each parent faces in meeting those needs. Even though ther...

  14. The circle of security parenting and parental conflict: a single case study

    OpenAIRE

    Pazzagli, Chiara; Laghezza, Loredana; Manaresi, Francesca; Mazzeschi, Claudia; Powell, Bert

    2014-01-01

    The Circle of Security Parenting (COS-P) is an early attachment based intervention that can be used with groups, dyads, and individuals. Created in the USA and now used in many countries, COS-P is a visually based approach that demonstrates its central principles through videos of parent/child interactions. The core purpose of the COS-P is to provide an opportunity for caregivers to reflect on their child's needs and on the challenges each parent faces in meeting those needs. Even though ther...

  15. The identification of the pigments used to paint statues of Feixiange Cliff in China in late 19th century by micro-Raman spectroscopy and scanning electron microscopy/energy dispersive X-ray analysis

    Science.gov (United States)

    Jin, Pu-jun; Huang, Wei; Jianhua-Wang; Zhao, Gang; Wang, Xiao-ling

    2010-11-01

    The application of micro-Raman spectroscopy (μ-RS) and scanning electron microscopy (SEM)/energy dispersive X-ray spectrometer (EDS) to the research of pigments collected from Statues of Feixiange Cliff No. 67 and No. 69 niche of Tang Dynasty in China is reported. Five kinds of pigments were found in the experimental data, including black (carbon), white (gypsum + quartz), blue (lapis lazuli) and green (Paris green + Barium sulphate). After synthesized in 1814, Paris green was reported for a large import as a light and bright green pigment to paint architectures in China from the late 19th century. The analyzed blue pigment demonstrated the similar Raman spectra to the Lâjvardina blue glazed ceramics, which indicated lapis lazuli was an artificial product. This confirmed the painting of Feixiange Cliff in the early Republic of China as the historical record, and also reveals that some pigments were imported from abroad.

  16. 论藏东吐蕃摩崖造像与吐蕃高僧益西央%On Cliff Carvings in East Tibet from the Tubo Dynasty and Yishi Yang, a Tibetan Monk

    Institute of Scientific and Technical Information of China (English)

    霍巍

    2015-01-01

    Some cliff carvings of the Tubo dynasty have been discovered in the east part of the Qinghai-Tibet pla⁃teau in recent years, among which there are three locations of cliff carvings with explicit records of the organizer of the cliff carving, Yishi Yang (ye-shes-dbyang), a Tibetan monk of the Tubo dynasty. It becomes a key clue for us to comprehend the new archaeological material. Based on the understanding of the inscription found at the three locations and some relevant records in Dunhuang literature, this article explores the life of Yishi Yang so as to know the exact time and the religious background of the cliff carvings.%近年来在青藏高原东麓相继发现了一批吐蕃时期的摩崖造像,其中有三处造像地点都明确记载了造像的组织者为吐蕃高僧益西央(ye-shes-dbyang),这是我们理解这批新发现考古材料关键性的线索之一。文章通过对三处造像题记的解读并结合敦煌出土古藏文文献,探讨吐蕃高僧益西央的生平事迹,进而更为深刻地理解藏东吐蕃摩崖造像产生的时代与宗教背景。

  17. Laser controlled deposition of metal microstructures via nondiffracting Bessel beam illumination

    Science.gov (United States)

    Drampyan, Rafael; Leonov, Nikita; Vartanyan, Tigran

    2016-04-01

    The technique of the laser controlled deposition of sodium and rubidium deposits on the sapphire substrate is presented. The metals were deposited on the clean sapphire substrate from the vapor phase contained in the evacuated and sealed cell. We use an axicon to produce a non-diffracting Bessel beam out of the beam got from the cw diode laser with 200 mW power at the wavelength of 532 nm. After 30 minutes of the laser-controlled deposition the substrates were examined in the optical microscope. The obtained metal deposits form the sharp-cut circles with the pitch of 10 μm, coincident with the tens of dark rings of the Bessel beam. Reduction of the laser power leads to the build up of the continuous metal film over the whole substrate.

  18. Deposition of antimony telluride thin film by ECALE

    Institute of Scientific and Technical Information of China (English)

    GAO Xianhui; YANG Junyou; ZHU Wen; HOU Jie; BAO Siqian; FAN Xi'an; DUAN Xingkai

    2006-01-01

    The process of Sb2Te3 thin film growth on the Pt substrate by electrochemical atomic layer epitaxy (ECALE) was studied. Cyclic voltammetric scanning was performed to analyze the electrochemical behavior of Te and Sb on the Pt substrate. Sb2Te3 film was formed using an automated flow deposition system by alternately depositing Te and Sb atomic layers for 400 circles. The deposited Sb2Te3 films were characterized by XRD, EDX, FTIR and FESEM observation. Sb2Te3 compound structure was confirmed by XRD pattern and agreed well with the results of EDX quantitative analysis and coulometric analysis. FESEM micrographs showed that the deposit was composed of fine nano particles with size of about 20 nm. FESEM image of the cross section showed that the deposited films were very smooth and dense with thickness of about 190 nm. The optical band gap of the deposited Sb2Te3 film was determined as 0.42 eV by FTIR spectroscopy, and it was blue shifted in comparison with that of the bulk Sb2Te3 single crystal due to its nanocrystalline microstructure.

  19. Vertical head and trunk movement adaptations of sound horses trotting in a circle on a hard surface.

    Science.gov (United States)

    Starke, Sandra D; Willems, Egbert; May, Stephen A; Pfau, Thilo

    2012-07-01

    Trotting a horse in circles is a standard and important part of the subjective equine lameness examination, yet objective data on this form of locomotion are sparse. The aim of this study was to investigate the effect of trotting in a circle on head and trunk movement symmetry. Vertical movements of the head, withers, os sacrum and left and right tuber coxae were measured using inertial sensors as 12 sound horses were trotted on a hard surface in a straight line and in a circle on both reins. Seven asymmetry measures and hip hike were calculated for each horse for at least nine strides of comparable stride duration across the three conditions (deviation on horse level ≤3.7% stride duration). Trotting in a circle introduced systematic changes to the movement pattern of all five body landmarks, affecting most asymmetry measures. On average the asymmetry magnitude was comparable for midline locations between reins and for the tuber coxae on opposite reins with few exceptions, although individual horses showed unsystematic differences between the two reins. The results from this study showed that the thresholds for objective discrimination between lame and non-lame horses will need adjustment on the circle due to the observed asymmetry bias. PMID:22104508

  20. The application of quality control circle in neurosurgery ICU nurses in raising compliance of the head of a bed

    Directory of Open Access Journals (Sweden)

    Na LI

    2014-11-01

    Full Text Available Objective: To explore the application of quality control circle in raising compliance of the head of a bed in neurosurgery ICU nurses. Methods: The quality control circle was made up of 4 ICU nurses, determine the subject in order to improve the neurosurgery ICU nurses in raising compliance of the head of a bed, according to the QCC activity steps to formulate plans, including grasp the current situation, goal setting, through analysis, circle members develop strategy and plan implementation and review, finally compared the situation before and after neurosurgery ICU nurses raised bed activities compliance. Results: After implementation of QCC, neurosurgery ICU nurses raised bed to 30 ~ 45 degrees. After activities, circle members in the team cooperation ability, cohesion, to accept new things ability, and innovative thinking ability and to raise the understanding of the relevant knowledge of the head of a bed has improved significantly. Conclusion: The application of quality management circle activity improves the neurosurgery ICU nurses effectively raise the compliance of the head of a bed, improve the comprehensive quality of the clinical nurses.