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.
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...
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...
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; ...
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....
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...
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…
QWL Strategies: Quality Circles.
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…
Locating Problems with Quality Circles.
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)
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....
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...
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
Persistence for Circle Valued Maps
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 ...
Transportation Distances on the Circle
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.
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.)
Apollonian circles and hyperbolic geometry
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.
Digital Storytelling: Reinventing Literature Circles
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…
Three-manifolds, Foliations and Circles, I
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...
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...
Creating collaborative advantage through students' quality circles
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
Learning circles: a strategy for clinical practicum.
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
Sun Circle: An Archeoastronomical Monument
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.
Creating Circle of Courage Schools
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…
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.
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...
"Take Me to the Mathematical Circle!"
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.
Three techniques for obtaining algebraic circle packings
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 ...
Circle discrepancy for checkerboard measures
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.
Developing Soft Skills Using "Literature Circles"
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…
Circle-preserving transformations in Finsler spaces
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.
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....
Unit Circles and Inverse Trigonometric Functions
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;…
A note on circle patterns on surfaces
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).
The Circle of Courage and Positive Psychology
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…
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
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)
Darboux cyclides and webs from circles
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.
Circling particles and drafting in optical vortices
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...
Fluctuations of Quantum Random Walks on Circles
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...
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.
Packing circles and spheres on surfaces
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.
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.
Packing circles and spheres on surfaces
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.
Generic Rigidity for Circle Diffeomorphisms with Breaks
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}.
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.
On circle map coupled map lattice
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.
Syllable Circles for Pronunciation Learning and Teaching
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…
Community Social Work and the Learning Circle
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…
Conversations among Writers in Authors Circles.
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,…
A Spring Playscape Project: Building a Tree Circle
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…
Multiple Intelligence Literature Circles: A JFL and an EFL Experience
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…
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.
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 .
The Bakhtin Circle and Applied Linguistics
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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.
Telomeric circles: universal players in telomere maintenance?
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...
Sleep disturbances and PTSD: a perpetual circle?
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...
The Bakhtin Circle and Applied Linguistics
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.
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.
Walking in circles: a modelling approach.
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
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.
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
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....
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.
Expanding Circles within the Outer Circle: The Rural Kisii in Kenya
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…
Perturbing the hexagonal circle packing: a percolation perspective
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.
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
Parallelization Research of Circle Detection Based on Hough Transform
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.
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...
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...
GENERATING FRACTAL PATTERNS BY USING p-CIRCLE INVERSION
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.
Existence of Chimera State on Two Parallel Circles
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.
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...
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.
Fast transport optimization on the circle
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.
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.
Distribution of Circles on a Circle and Correlation Between Vortex Rings of Superfluids
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.
An Effective Time and Management Strategy in Quality Circles.
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,…
The Japanese Quality Control Circle: Why It Works.
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…
Growing a Circle of Courage Culture: One School's Journey
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…
Families and the Circle of Courage[TM
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…
Quality Circles in Higher Education: Quality, Satisfaction, and Climate.
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…
Study Circles and the Dialogue to Change Program
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…
Ethical dimension of circle Integrative Community Therapy on qualitative research.
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
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)
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
Inhomogeneous field theory inside the arctic circle
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.
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...
Rotation Intervals for Quasi-Periodically Forced Circle Maps
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 +...
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.
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.
Bounded Gain of Energy on the Breathing Circle Billiard
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.
Simulation of Induction Motor Characteristics Using a Circle Diagram
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.
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.
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.
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.
Optimal impulsive ellipse-to-circle coplanar rendezvous
Institute of Scientific and Technical Information of China (English)
无
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.
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.
Minimal genus in 4-manifolds with a free circle action
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.
Culture Circles in adolescent empowerment for the prevention of violence
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 ...
Literature Circles: An Effective Method to Develop Reading Habit
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...
Peacemaking Circles & Young Refugees: Building Resilience in Germany
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...
Ethical dimension of circle Integrative Community Therapy on qualitative research
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...
Empowering Children Through Circle Time: An Illumination of Practice
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...
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.
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.
Circles of Support and personalization: Exploring the economic case.
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
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.
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.
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
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.
Circles Disturbed The Interplay of Mathematics and Narrative
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
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....
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.
An Approach for Self-Calibration by a Quartered Circle
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...
A Phase Transition for Circle Maps and Cherry Flows
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.
A Phase Transition for Circle Maps and Cherry Flows
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.
Computing circles and spheres of arithmitic least squares
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.
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...
Dance in a circle – from prehistory to the kindergarten
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...
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.
A review of fast circle and helix fitting
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.
Examining Circle of Security™: A Review of Research and Theory
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…
Circle Time for Social and Emotional Learning in Primary School
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…
Elliptic open books on torus bundles over the circle
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.
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.
Role of a circle's center in visual interpolation.
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
Arctic circles, domino tilings and square Young tableaux
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...
Revisiting Cyberbullying in Schools Using the Quality Circle Approach
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…
The Circle of Courage and Erikson's Psychological Stages.
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…
School of Urban Wilderness Survival and the Circle of Courage
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…
Literature Circles: A Perfect Match for Online Instruction
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…
Sacred Circles: 2000 Years of North American Indian Art
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)
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
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)
Circles of support and accountability: How and why they work for sex offenders
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...
Transaction Circles with Digital Texts as a Foundation for Democratic Practices
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…
Native American Values and Management Education: Envisioning an Inclusive Virtuous Circle
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…
The Chicken and the Egg: Inviting Response and Talk through Socratic Circles
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,…
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.
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
Sampling great circles at their rate of innovation
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.
T-duality for circle bundles via noncommutative geometry
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.
Climate Change and Tourism in the Arctic Circle
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...
Taking a literature circles approach to teach Academic English
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....
CS Circles: An In-Browser Python Course for Beginners
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...
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.
Confidence circles for correspondence analysis using orthogonal polynomials
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...
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.
Localization techniques in circle-equivariant KK-theory
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...
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)
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
Microbial Biomass and Population Densities of Non-Sorted Circles in High Arctic Ecosystems
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
Stereoscopic Machine-Vision System Using Projected Circles
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
Connecting a Set of Circles with Minimum Sum of Radii
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.
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.
Random Domino Tilings and the Arctic Circle Theorem
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 ...
Deviation from Alday-Maldacena Duality For Wavy Circle
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...
The Phenomenological Circle and the Unity of Life and Thought.
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
Social Circles: A 3D User Interface for Facebook
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.
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.
Chimera states in coupled sine-circle map lattices
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 ...
Spectra of mothers of premature children about the educative circle of culture.
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
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.
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.
Multi Circle Detection on Images Using Artificial Bee Colony (ABC) Optimization
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...
SPECTRA OF MOTHERS OF PREMATURE CHILDREN ABOUT THE EDUCATIVE CIRCLE OF CULTURE
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. ...
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.
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.
Literature circles book club for science and language arts
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.
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.
Planar maps, circle patterns and 2d gravity
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.
Minimalisasi Kekurangan Material Melalui Implementasi Quality Control Circle
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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.
No evidence for anomalously low variance circles on the sky
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.
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)
G2 cubic transition between two circles with shape control
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.
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...
On the Existence of Periodic Orbits for the Fixed Homogeneous Circle Problem
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.
Providing a Full Circle of Support to Teachers in an Inclusive Elementary School
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…
RiemCirc: A Generator of Nodes and Weights for Riemann Integration on the Circle
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.
Table or Circles: A Comparison of Two Methods for Choosing among Career Alternatives
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…
Systematic comparison of the use of annular and Zernike circle polynomials for annular wavefronts
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
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
A surface containing a line and a circle through each point is a quadric
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.
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)
A Variant of K-Theory and Topological T-Duality for Real Circle Bundles
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.
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…
Comparing Interactions in Literature Circles in Both Online and in Class Discussions
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…
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…
A new method for fast circle detection in a complex background image
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.
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.
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
Kinetics of the forelimb in horses circling on different ground surfaces at the trot.
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
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 Î·-dependent and Î¾-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 Î¾Î¾-triangular equilibrium points in the plane Î· = 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 Î·-dependent and Î¾-dependent stabilities. The stability of Lagrange as well as Fawzy triangular equilibrium points followed directly because they are subsets of the Fawzy equilibrium circle.
Vienna Circle and Logical Analysis of Relativity Theory
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...
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.
End of the line to build a circle
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...
Viroid Replication: Rolling-Circles, Enzymes and Ribozymes
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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.
Complex velocity potential for an ellipse and a circle in translation and rotation
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.
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...
Geologic Provinces of the Circum-Arctic, 2008 (north of the Arctic Circle)
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...
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
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 ...
Detection of HIV cDNA Point Mutations with Rolling-Circle Amplification Arrays
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...
The Arithmetic of Elliptic Fibrations in Gauge Theories on a Circle
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...
A New Archaeoastronomical Investigation of the Irish Axial-Stone Circles
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...
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
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 ...
Local Circles in a Circular Economy – the Case of Smartphone Repair in Denmark
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...
Introspection, empathy, and the semi-circle of mental health.
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
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
Anatomical variations of the circle of Willis and cerebrovascular accidents in transitional Albania
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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
Anatomical Variations of the Circle of Willis in Males and Females on 3D MR Angiograms
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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
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)
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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.
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
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 ...
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...
Great circle solution to polarization-based quantum communication (QC) in optical fiber
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.
Mosh pits and Circle pits: Collective motion at heavy metal concerts
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.
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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.
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.
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 ...
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
Circle of Willis variation in a complex stroke presentation: a case report
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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.
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.
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
Investigation of Brain Arterial Circle Malformations Using Electrical Modelling and Simulation
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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.
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
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...
On the Ratio of Circumference to Diameter for the Largest Observable Circles: An Empirical Approach
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.
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
Empirical Research on the Urban Development Level of Wuhan Urban Circle
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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.
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.
ULYSSES comes full circle, before revisiting the Sun's poles
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
THE INTEGRATED STATE OF THE ROLLING-CIRCLE PLASMID PTB913 IN THE COMPOSITE BACILLUS PLASMID PTB19
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
Collusive attacks to "circle-type" multi-party quantum key agreement protocols
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.
Education, Enlightenment and Positivism: The Vienna Circle's Scientific World-Conception Revisited
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…
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....
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)
Approximation by polynomials and Blaschke products having all zeros on a circle
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.
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)
Encounters with Wisdom: A Case Study of Community Worker Reflection Circles in San Antonio, TX
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…
An Investigation of "Circle of Friends" Peer-Mediated Intervention for Students with Autism
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)…
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
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
The Arithmetic of Elliptic Fibrations in Gauge Theories on a Circle
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 ...
Circle Justice: A Creative Arts Approach to Conflict Resolution in the Classroom
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…
Circle of Life HIV/AIDS-Prevention Intervention for American Indian and Alaska Native Youth
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…
Volunteers in Circles of Support and Accountability : Job demands, job resources, and outcome
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
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.
Minimal fixed point set of maps on Torus Fiber Bundles over the Circle
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.
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
Runaway Climate Change as Challenge to the "Closing Circle" of Education for Sustainable Development
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…
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…
Talking Books: Gender and the Responses of Adolescents in Literature Circles
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…
The Listening Circle: Using the SBI Model to Enhance Peer Feedback
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…
The Schwinger Model on a circle: relation between Path Integral and Hamiltonian approaches
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.
Some Comments On: A Historical Note on the Proof of the Area of a Circle
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…
Evaluation Learning Circles: A Sole Proprietor's Evaluation Capacity-Building Strategy
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…
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…
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)
"Slow Down, You Move Too Fast:" Literature Circles as Reflective Practice
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…
Always Searching for Strengths: Interviewing and Counseling with the Circle of Courage
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…
Facebook and Virtual Literature Circle Partnership in Building a Community of Readers
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…
Using Social Networks and ICTs to Enhance Literature Circles: A Practical Approach
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…
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.)
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.
Early-Years Teachers' Concept Images and Concept Definitions: Triangles, Circles, and Cylinders
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…
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
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.
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.
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.
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.
Impact of the DNA extraction method on 2-LTR DNA circle recovery from HIV-1 infected cells
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...
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.
Pythagorean hodograph spline spirals that match G3 Hermite data from circles
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.
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
Nano rolling-circle amplification for enhanced SERS hot spots in protein microarray analysis.
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
NanoCluster Beacons as Reporter Probes in Rolling Circle Enhanced Enzyme Activity Detection†
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
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.)
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.
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
Construction of symplectic structures on 4-manifolds with a free circle action
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]).
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...
On the notion of "von Neumann vicious circle" coined by John Backus
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...
Review of Barrow Hill: Curse of the Ancient Circle PC Game
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.
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 ...
On Linear Combinations of Two Orthogonal Polynomial Sequences on the Unit Circle
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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.
Investigating the Use of Circle in Gear Cutting as a Substitute to Involute Profile
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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.
PHACE(S) Syndrome With Absent Intracranial Internal Carotid Artery and Anomalous Circle of Willis.
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
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...
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...
Recombination at Long Mutant Telomeres Produces Tiny Single- and Double-Stranded Telomeric Circles
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...
Peer Evaluation of Master Programs: Closing the Quality Circle of the CDIO Approach?
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...
Anti-racist cultural politics in post-imperial Britain: the New Beacon Circle
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...
Evolving Landscape of Scholarly Communications in BC: cIRcle: a new Library 'Publishing' Service
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.
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.
Discovery of fairy circles in Australia supports self-organization theory.
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
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...
Empirical Research on the Urban Development Level of Wuhan Urban Circle
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...
Sleep disturbances and post-traumatic stress disorder; a perpetual circle?
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...
Social circles: a simple structure for agent-based social network models
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.
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)
Numerical simulation of the blood flow behavior in the circle of Willis
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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.
White Blood Cell Segmentation by Circle Detection Using Electromagnetism-Like Optimization
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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.
White Blood Cell Segmentation by Circle Detection Using Electromagnetism-Like Optimization
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
Linear Determination of a Camera's Intrinsic Parameters Using Two Intersecting Circles
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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.
Design of Circle Array Pattern for Transparent Nanomesh-Type Electrodes.
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
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.
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.
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
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)
"Really," "Not Possible," "I Can't Believe It": Exploring Informational Text in Literature Circles
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.
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...
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.
Institute of Scientific and Technical Information of China (English)
无
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.
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
'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.
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
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.
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.
[From Comte to Carnap. Marcel Boll and the introduction of the Vienna Circle in France].
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
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.
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.
The "Dot in Circle" Sign on MRI in Maduramycosis: A Characteristic Finding
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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.
Renormalization and 3-manifolds which fiber over the circle (AM-142)
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
Great Circle Distance Methode for Improving Operational Control System Based on GPS Tracking System
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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.
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.
Time of arrival operator on the circle. (Variations on two Mielnik's works)
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.
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...
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
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.
The Circle Of Security Parenting and parental conﬂict: a single case study
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...
The circle of security parenting and parental conflict: a single case study
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...
Vertical head and trunk movement adaptations of sound horses trotting in a circle on a hard surface.
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
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.
Experimental evidence for the occurrence of E8 in nature and the radii of the Gosset circles
Kostant, Bertram
2010-01-01
A recent experimental discovery involving the spin structure of electrons in a cold one-dimensional magnet points to a validation of a Zamolodchikov model involving the exceptional Lie group $E_8$. The model predicts 8 particles and predicts the ratio of their masses. I.e., the vertices of the 8-dimensional Gosset polytope identifies with the 240 roots of $E_8$. Under the 2-D (Peter McMullen) projection of the polytope, the image of the vertices are arranged in 8 concentric circles, here referred to as the Gosset circles. The Gosset circles are understood to correspond to the 8 masses in the model, and it is understood that the ratio of their radii is the same as the ratio of the corres-ponding conjectural masses. A ratio of the two smallest circles (read 2 smallest masses) is the golden number. The conjectures have been now validated experimentally, at least for the first five masses. The McMullen projection generalizes to any complex simple Lie algebra whose rank is greater than 1. The Gosset circles also g...
Gomero, G I; Reboucas, M J
2016-01-01
[Abridge] An observable signature of a detectable nontrivial spatial topology of the Universe is the circles-in-the-sky in the CMB sky. In the most general search, pairs of circles with deviation from antipodality $0^\\circ \\leq \\theta \\leq 169^\\circ$ and radii $10^\\circ \\leq \\lambda \\leq 90^\\circ$ were investigated, but no matching circles were found. Assuming this negative result, we examine the question as to whether there are nearly flat universes with compact topology that would give rise to circles whose observable parameters $\\lambda$ and $\\theta$ fall o outside the ranges covered by this search. We derive the expressions for the deviation from antipodality and for the radius of the circles associated to a pair elements ($\\gamma\\,$,$\\gamma^{-1}$) of the holonomy group $\\Gamma$ which define the spatial section of any positively curved universe with a nontrivial topology. We show that there is a critical position that maximizes the deviation from antipodality, and prove that no matter how nearly flat the ...
New Way of Flank Circle Action Training%全旋类动作训练的新途径
Institute of Scientific and Technical Information of China (English)
薛志英; 祝威
2012-01-01
Pommel horse flank circle motion is a important basic movement to improve the technical level.The analysis and summary of the flank circle movement law,the flank circle movement technology.After years of training and researching,based on seize the flank circle ac- tion key technology.By developing the carousel auxiliary equipment,practice proves that the equipment can accelerate the formation of tech- nology,shortening of the action learning time,accelerate the error corrected,cultivating learning interest improve the flank circle action quality.%鞍马全旋类动作是提高鞍马技术水平的一个重要的基本动作。经过多年的训练、研究，在分析总结全旋类动作的动作规律、全旋动作技术、抓住全旋类动作关键技术的基础上，研制旋转木马辅助训练器，实践证明该设备能加速技术的形成，缩短动作的学习时间，加快错误动作的纠正，培养学习动作的兴趣，提高全旋类动作的动作质量。
Kalman, Calvin S.
2011-02-01
Students can have great difficulty reading scientific texts and trying to cope with the professor in the classroom. Part of the reason for students' difficulties is that for a student taking a science gateway course the language, ontology and epistemology of science are akin to a foreign culture. There is thus an analogy between such a student and an anthropologist spending time among a native group in some remote part of the globe. This brings us naturally to the subject of hermeneutics. It is through language that we attempt to understand an alien culture. The hermeneutical circle involves the interplay between our construct of the unfamiliar with our own outlook that deepens with each pass. It can be argued that for novice students to acquire a full understanding of scientific texts, they also need to pursue a recurrent construction of their comprehension of scientific concepts. In this paper it is shown how an activity, reflective-writing, can enhance students' understanding of concepts in their textbook by getting students to approach text in the manner of a hermeneutical circle. This is illustrated using studies made at three post-secondary institutions.
Yukawa textures in string unified models with SU(4)circle-times O(4) symmetry
International Nuclear Information System (INIS)
We discuss the origin of Yukawa textures in the string-inspired and string-derived models based on the gauge group SU(4)circle-times SU(2)L circle-times SU(2)R supplemented by a U(1)X gauged family symmetry. The gauge symmetries are broken down to those of the minimal supersymmetric standard model which is the effective theory below 1016 GeV. The combination of the U(1)X family symmetry and the Pati-Salam gauge group leads to a successful and predictive set of Yukawa textures involving two kinds of texture zeros: horizontal and vertical texture zeros. We discuss both symmetric and nonsymmetric textures in models of this kind, and in the second case perform a detailed numerical fit to the charged fermion mass and mixing data. Two of the Yukawa textures allow a low energy fit to the data with a total χ2 of 0.39 and 1.02, respectively, for three degrees of freedom. We also make a first attempt at deriving the nonrenormalizable operators required for the Yukawa textures from string theory. copyright 1997 The American Physical Society
Detection of HIV cDNA Point Mutations with Rolling-Circle Amplification Arrays
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Zhongwei Wu
2010-01-01
Full Text Available 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 amplification to generate multimeric singlestranded DNA (ssDNA under isothermal conditions. There are four sequence regions to bind respectively with fluorescent probe, RCA primer, solid probe and HIV cDNA template in the C-probe which we designed. These ssDNA products are hybridized with fluorescent probes and solid probes which are immobilized on a glass slide composing a regular microarray pattern. The fluorescence signals can be monitored by a scanner in the presence of HIV cDNA templates, whereas the probes cannot be circularized and signal of fluorescence cannot be found. The RCA array has capability of high-throughput detection of the point mutation and the single-nucleotide polymorphism (SNP.The development of C-probe-based technologies offers a promising prospect for situ detection, microarray, molecular diagnosis, single nucleotide polymorphism, and whole genome amplification.
Institute of Scientific and Technical Information of China (English)
Li Chen; Cheng Shengkui; Chen Yuansheng; Xu Zengrang
2006-01-01
Holiday Tourism Circle of Beijing (HTCB) is one of the nine key regions of Chinese tourism industry in the period of the 11th Five-Year Project. According to Tourist Marginal Utility Theory, Time-Distance Method is used to define HTCB in this paper. Chengde City, famous for its cultural tourism, is regard as one of the regions in Holiday Tourism Circle of Beijing. And this geographical advantage, in the context of the boom of tourism in China, is featured by the changes of tourist product structure and development model. In this paper, the influence upon Chengde tourism spatial structure has been discussed from tourist market, location and transportation. Chengde tourism spatial structure has been rebuilt with particular references to the factors of tourism destination district, tourist area, nodes, routes, and origin markets. In this paper, Chengde will develop tourism industry with the central heritage area as the center and northern forest and pasture area and southern mountain and lake area as the two wings.
High-throughput genotyping of single nucleotide polymorphisms with rolling circle amplification
Directory of Open Access Journals (Sweden)
Sun Zhenyu
2001-08-01
Full Text Available Abstract Background Single nucleotide polymorphisms (SNPs are the foundation of powerful complex trait and pharmacogenomic analyses. The availability of large SNP databases, however, has emphasized a need for inexpensive SNP genotyping methods of commensurate simplicity, robustness, and scalability. We describe a solution-based, microtiter plate method for SNP genotyping of human genomic DNA. The method is based upon allele discrimination by ligation of open circle probes followed by rolling circle amplification of the signal using fluorescent primers. Only the probe with a 3' base complementary to the SNP is circularized by ligation. Results SNP scoring by ligation was optimized to a 100,000 fold discrimination against probe mismatched to the SNP. The assay was used to genotype 10 SNPs from a set of 192 genomic DNA samples in a high-throughput format. Assay directly from genomic DNA eliminates the need to preamplify the target as done for many other genotyping methods. The sensitivity of the assay was demonstrated by genotyping from 1 ng of genomic DNA. We demonstrate that the assay can detect a single molecule of the circularized probe. Conclusions Compatibility with homogeneous formats and the ability to assay small amounts of genomic DNA meets the exacting requirements of automated, high-throughput SNP scoring.
A CLIQUE algorithm using DNA computing techniques based on closed-circle DNA sequences.
Zhang, Hongyan; Liu, Xiyu
2011-07-01
DNA computing has been applied in broad fields such as graph theory, finite state problems, and combinatorial problem. DNA computing approaches are more suitable used to solve many combinatorial problems because of the vast parallelism and high-density storage. The CLIQUE algorithm is one of the gird-based clustering techniques for spatial data. It is the combinatorial problem of the density cells. Therefore we utilize DNA computing using the closed-circle DNA sequences to execute the CLIQUE algorithm for the two-dimensional data. In our study, the process of clustering becomes a parallel bio-chemical reaction and the DNA sequences representing the marked cells can be combined to form a closed-circle DNA sequences. This strategy is a new application of DNA computing. Although the strategy is only for the two-dimensional data, it provides a new idea to consider the grids to be vertexes in a graph and transform the search problem into a combinatorial problem. PMID:21511001
Niche-Partitioning of Edaphic Microbial Communities in the Namib Desert Gravel Plain Fairy Circles
Ramond, Jean-Baptiste; Pienaar, Annelize; Armstrong, Alacia; Seely, Mary; Cowan, Don A.
2014-01-01
Endemic to the Namib Desert, Fairy Circles (FCs) are vegetation-free circular patterns surrounded and delineated by grass species. Since first reported the 1970's, many theories have been proposed to explain their appearance, but none provide a fully satisfactory explanation of their origin(s) and/or causative agent(s). In this study, we have evaluated an early hypothesis stating that edaphic microorganisms could be involved in their formation and/or maintenance. Surface soils (0–5cm) from three different zones (FC center, FC margin and external, grass-covered soils) of five independent FCs were collected in April 2013 in the Namib Desert gravel plains. T-RFLP fingerprinting of the bacterial (16S rRNA gene) and fungal (ITS region) communities, in parallel with two-way crossed ANOSIM, showed that FC communities were significantly different to those of external control vegetated soil and that each FC was also characterized by significantly different communities. Intra-FC communities (margin and centre) presented higher variability than the controls. Together, these results provide clear evidence that edaphic microorganisms are involved in the Namib Desert FC phenomenon. However, we are, as yet, unable to confirm whether bacteria and/or fungi communities are responsible for the appearance and development of FCs or are a general consequence of the presence of the grass-free circles. PMID:25279514
Research of operators circle marketing system%运营商圈子营销系统研究
Institute of Scientific and Technical Information of China (English)
赵力帅; 武振宇; 曹原铭
2015-01-01
This paper introduced the concept and characteristics of circle marketing, studied the internet enterprises’ successful experience. In light of the problems that the operators faced in the business promotion, proposed the circle marketing construction scheme of telecom operators. Finally, the paper made some suggestions for the development of telecom operators circle marketing business.%介绍了圈子营销的概念和特点，经过研究互联网企业圈子营销的成功经验，针对运营商在业务宣传和推广中面临的问题，提出针对电信运营商的圈子营销系统建设方案，最后对于电信运营商圈子营销业务的开展提出了建议。
Directory of Open Access Journals (Sweden)
Jianwei Zhao
2016-01-01
Full Text Available A circle forming problem for a group of mobile agents governed by first-order system is investigated, where each agent can only sense the relative angular positions of its neighboring two agents with time delay and move on the one-dimensional space of a given circle. To solve this problem, a novel decentralized sampled-data control law is proposed. By combining algebraic graph theory with control theory, some necessary and sufficient conditions are established to guarantee that all the mobile agents form a pregiven circle formation asymptotically. Moreover, the ranges of the sampling period and the coupling delay are determined, respectively. Finally, the theoretical results are demonstrated by numerical simulations.
International Nuclear Information System (INIS)
A novel two-step method for spatial circle orientation with a structured light vision sensor is proposed for a 3D flexible visual inspection system guided by an industrial robot. Firstly the z coordinate of a spatial circle center is estimated, secondly the x and y coordinates are estimated with the center orientation relative to the camera optic center, and then its radius is computed. Simultaneously, the x, y and z coordinate orientation errors are analyzed in detail. It shows that the method is feasible and valid, and the orientation accuracy for the spatial circle exceeds 0.15 mm by experiment. It eliminates the bottleneck of the traditional orientation method with a stereovision sensor, and greatly expands the application of the structured light visual inspection system
Clash of discrete symmetries for the supersymmetric kink on a circle
International Nuclear Information System (INIS)
We consider the N=1 supersymmetric kink on a circle, i.e., on a finite interval with boundary or transition conditions which are locally invisible. For Majorana fermions, the single-particle Dirac Hamiltonian as a differential operator obeys simultaneously the three discrete symmetries of charge conjugation, parity, and time reversal. However, no single locally invisible transition condition can satisfy all three. When calculating sums over zero-point energies by mode number regularization, this gives a new rationale for a previous suggestion that one has to average over different choices of boundary conditions, such that for the combined set all three symmetries are obeyed. In particular it is shown that for twisted periodic or twisted antiperiodic boundary conditions separately both parity and time reversal are violated in the kink sector, as manifested by a delocalized momentum that cancels only in the average
Circle quorum system-based non-stop network service model
Institute of Scientific and Technical Information of China (English)
宋平; 孙建伶; 何志均
2004-01-01
Rapid developments in network systems of business service have resulted in more reliance on distributed computing, typified by "subscriber/push" architectures. Unfortunately, frequent and unexpectable network failures were routine, and downtime was not in hours, but in days. High availability has become the most important factor decreasing business risk and improving Quality of Service. Cluster technology has solved the non-stop problem on Local Area Network. However, most technologies including cluster today fail to ensure the non-stop Internet service based on Routers. With good performance on high availability and fault tolerance, quorum systems are very suitable for application to distributed business service networks. In this work, we modeled and developed a non-stop Internet service system based on a new quorum system, circle quorum system, for Boston Mutual Fund Broker, US. With five protocols, it provided highly available data services for clients on Internet.
Circle quorum system-based non-stop network service model
Institute of Scientific and Technical Information of China (English)
宋平; 孙建伶; 何志均
2004-01-01
Rapid developments in network systems of business service have resulted in more reliance on distributed computing, typified by “subscriber/push” architectures. Unfortunately, frequent and unexpectable network failures were routine, and downtime was not in hours, but in days. High availability has become the most important factor decreasing business risk and improving Quality of Service. Cluster technology has solved the non-stop problem on Local Area Network. However, most technologies including cluster today fail to ensure the non-stop Internet service based on Routers. With good performance on high availability and fault tolerance, quorum systems are very suitable for application to distributed business service networks. In this work, we modeled and developed a non-stop Internet service system based on a new quorum system, circle quorum system, for Boston Mutual Fund Broker, US. With five protocols, it provided highly available data services for clients on Internet.
LINEAR BUNDLES WITHIN THE FRAMEWORK OF COINCIDENCE OF CIRCLE AND ELLIPSE
Directory of Open Access Journals (Sweden)
Polezhaev Yuriy Olegovich
2012-10-01
Full Text Available Compositions represented by geometrical graphic models of circular and elliptical shapes enjoy wide application in architectural and interior design. The research of variations of coincidences of circles and ellipses is a relevant subject of exploration. In the paper, the authors analyze some of the multiplicity of coincidences, and an example of their practical implementation (a church dome model. The section of an object is "amalgamated" into the architectural concept of the structure, the relief and theological ideas. Geometric interlinks, compositions and figurations of interconnected diameters, circular and elliptical arcs, their tangency, incidences and interspaces have always been of interest to researchers; they have triggered the search for harmonious and rational solutions in civil engineering and architecture. Advancements in theoretical geometrography and its software applications facilitate new solutions.
Directory of Open Access Journals (Sweden)
Graham-Marr Alastair
2015-01-01
Full Text Available Improving student understanding of a foreign language culture is anything but a peripheral issue in the teaching of a foreign language. This pilot study reports on a second year required English course in a university in Japan that took a Literature Circles approach, where students were asked to read short stories out of class and then discuss these stories in class. Although students reported that they did not gain any special insights into the target language culture presented, they did report that reading fiction as source material for classroom activity helps with the acquisition of a vocabulary set that is more closely associated with lifestyle and culture. The results suggest that further study is warranted. Procedures of this pilot study are described and interpreted in the context of the English education system in Japan.
Flexible calibration method for an inner surface detector based on circle structured light.
Zhu, Ye; Gu, Yonggang; Jin, Yi; Zhai, Chao
2016-02-10
A new calibration method for an inner surface detector based on circle structured light is proposed in this study. Compared with existing methods, this technique is more flexible and practical and only requires a blank planar board and an additional camera, which is precalibrated under the detector's coordinate system. The board is observed by the detector and the additional camera at a few (at least two) different orientations, which need not be known. The mathematical model of this method considers different alignment errors, which are disregarded in existing methods; therefore, precise assembly is not required. The binocular intersection algorithm is used to calculate the coordinates of the calibration points. The measurement system calibrated by this method performs well in the field test in which the maximum relative error of the measured values is less than 0.18%. The experimental result indicates that this method is highly accurate and can be easily applied in inner surface detection. PMID:26906372
Structurally unstable regular dynamics in 1D piecewise smooth maps, and circle maps
International Nuclear Information System (INIS)
Highlights: ► A discontinuous 1D map with two discontinuity points is considered. ► Dynamic behaviors are either periodic or quasiperiodic. ► Dynamics are always structurally unstable. ► Any small perturbation in one of the parameters leads to different dynamics. - Abstract: In this work we consider a simple system of piecewise linear discontinuous 1D map with two discontinuity points: X′ = aX if ∣X∣ z, where a and b can take any real value, and may have several applications. We show that its dynamic behaviors are those of a linear rotation: either periodic or quasiperiodic, and always structurally unstable. A generalization to piecewise monotone functions X′ = F(X) if ∣X∣ z is also given, proving the conditions leading to a homeomorphism of the circle.
Sonawane, Abhijeet R
2010-05-01
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 instant. We observe that such a 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 range of values of p . It is interesting to note that the transition falls in class of directed percolation. Static and spreading exponents along with relevant scaling laws are found to be obeyed confirming the directed percolation universality class in spatiotemporal intermittency regime. PMID:20866306
Self-Organized Vortices of Circling Self-Propelled Particles and Curved Active Flagella
Yang, Yingzi; Gompper, Gerhard
2014-01-01
Self-propelled point-like particles move along circular trajectories when their translocation velocity is constant and the angular velocity related to their orientation vector is also constant. We investigate the collective behavior of ensembles of such circle swimmers by Brownian dynamics simulations. If the particles interact via a ``velocity-trajectory coordination" rule within neighboring particles, a self-organized vortex pattern emerges. This vortex pattern is characterized by its particle-density correlation function $G_\\rho$, the density correlation function $G_c$ of trajectory centers, and an order parameter $S$ representing the degree of the aggregation of the particles. Here, we systematically vary the system parameters, such as the particle density and the interaction range, in order to reveal the transition of the system from a light-vortex-dominated to heavy-vortex-dominated state, where vortices contain mainly a single and many self-propelled particles, respectively. We also study a semi-dilute...
Circle grid fractal plate as a turbulent generator for premixed flame: an overview
International Nuclear Information System (INIS)
This review paper focuses to ascertain a new approach in turbulence generation on the structure of premixed flames and external combustion using a fractal grid pattern. This review paper discusses the relationship between fractal pattern and turbulence flow. Many researchers have explored the fractal pattern as a new concept of turbulence generators, but researchers rarely study fractal turbulence generators on the structure premixed flame. The turbulent flow field characteristics have been studied tand investigated in a premixed combustion application. In terms of turbulence intensity, most researchers used fractal grid that can be tailored so that they can design the characteristic needed in premixed flame. This approach makes it extremely difficult to determine the exact turbulent burning velocity on the velocity fluctuation of the flow. The decision to carry out additional research on the effect circle grid fractal plate as a turbulent generator for premixed flame should depends on the blockage ratio and fractal pattern of the grid
Ye, Tai; Chen, Jinyang; Liu, Yufei; Ji, Xinghu; Zhou, Guohua; He, Zhike
2014-09-24
A simple method for preparing DNA-stabilized Ag nanoclusters (NCs) nanowires is presented. To fabricate the Ag NCs nanowires, we use just two unmodified component strands and a long enzymatically produced scaffold. These nanowires form at room temperature and have periodic sequence units that are available for fluorescence Ag NCs assembled which formed three-way junction (TWJ) structure. These Ag NCs nanowires can be clearly visualized by confocal microscopy. Furthermore, due to the high efficiency of rolling circle amplification reaction in signal amplification, the nanowires exhibit high sensitivity for the specific DNA detection with a wide linear range from 6 to 300 pM and a low detection limit of 0.84 pM, which shows good performance in the complex serum samples. Therefore, these Ag NCs nanowires might have great potential in clinical and imaging applications in the future. PMID:25116051
MRI of mycetoma of the foot: two cases demonstrating the dot-in-circle sign
International Nuclear Information System (INIS)
Radiological and histological findings of two patients with fungal mycetoma of the foot are presented. MRI revealed multiple 2-5 mm lesions of high signal intensity interspersed within a low-intensity matrix. Within many of the lesions a minute low-intensity focus was identified. Ultrasound showed distinct hyperechoic foci within a hypoechoic mass. We speculate that the low-signal matrix represents fibrous tissue, the high-intensity lesions correspond to granulomata and the central low-signal focus to the characteristic organised fungal elements (grains) present in this condition. This ''dot-in-circle sign'' on MRI reflects the unique pathological features of mycetoma and is likely to be a highly specific sign for this lesion. (orig.)
Quality control circles: will they work at Sandia. Findings from a review of 66 sources
Energy Technology Data Exchange (ETDEWEB)
Jeys, G.H.
1982-01-01
Quality Control Circles (QCC's) meet regularly to solve limited, but important, problems related directly to their work. The QCC is organized so that the worker becomes involved in problem solving and quality awareness in meaningful and creative ways. Participation is voluntary. This concept has been successfully used in Japan for two decades. QCC's are now being implemented at an accelerating rate world-wide. There are questions as to QCC's applicability in the United States and in particular with respect to an R and D facility such as Sandia. This paper summarizes information about the QCC concept with respect to its implementation and applicability to Sandia. Information was extracted from 66 sources as noted in an Annotated Bibliography. Analysis techniques used by QCC's were utilized in the construction of this paper, especially with the Annotated Bibliography.
Topology and Flux of T-Dual Manifolds with Circle Actions
Mathai, Varghese; Wu, Siye
2012-11-01
We present an explicit formula for the topology and H-flux of the T-dual of a general type II, compactification, significantly generalizing earlier results. Our results apply to T-dualities with respect to any circle action on spacetime X. As before, T-duality exchanges type IIA and type IIB string theories. A new consequence is that the T-dual spacetime is a singular space when the fixed point set {X^{T}} is non-empty; the singularities correspond to Kaluza-Klein monopoles. We propose that the Ramond-Ramond charges of type II string theories on the singular dual are classified by twisted equivariant cohomology groups. We also discuss the K-theory approach.
The stochastic dance of circling sperm cells: sperm chemotaxis in the plane
International Nuclear Information System (INIS)
Biological systems such as single cells must function in the presence of fluctuations. It has been shown in a two-dimensional experimental setup that sea urchin sperm cells move toward a source of chemoattractant along planar trochoidal swimming paths, i.e. drifting circles. In these experiments, a pronounced variability of the swimming paths is observed. We present a theoretical description of sperm chemotaxis in two dimensions which takes fluctuations into account. We derive a coarse-grained theory of stochastic sperm swimming paths in a concentration field of chemoattractant. Fluctuations enter as multiplicative noise in the equations for the sperm swimming path. We discuss the stochastic properties of sperm swimming and predict a concentration-dependence of the effective diffusion constant of sperm swimming which could be tested in experiments.
Jin, Shengye; Tamura, Masayuki
2013-10-01
Monte Carlo Ray Tracing (MCRT) method is a versatile application for simulating radiative transfer regime of the Solar - Atmosphere - Landscape system. Moreover, it can be used to compute the radiation distribution over a complex landscape configuration, as an example like a forest area. Due to its robustness to the complexity of the 3-D scene altering, MCRT method is also employed for simulating canopy radiative transfer regime as the validation source of other radiative transfer models. In MCRT modeling within vegetation, one basic step is the canopy scene set up. 3-D scanning application was used for representing canopy structure as accurately as possible, but it is time consuming. Botanical growth function can be used to model the single tree growth, but cannot be used to express the impaction among trees. L-System is also a functional controlled tree growth simulation model, but it costs large computing memory. Additionally, it only models the current tree patterns rather than tree growth during we simulate the radiative transfer regime. Therefore, it is much more constructive to use regular solid pattern like ellipsoidal, cone, cylinder etc. to indicate single canopy. Considering the allelopathy phenomenon in some open forest optical images, each tree in its own `domain' repels other trees. According to this assumption a stochastic circle packing algorithm is developed to generate the 3-D canopy scene in this study. The canopy coverage (%) and the tree amount (N) of the 3-D scene are declared at first, similar to the random open forest image. Accordingly, we randomly generate each canopy radius (rc). Then we set the circle central coordinate on XY-plane as well as to keep circles separate from each other by the circle packing algorithm. To model the individual tree, we employ the Ishikawa's tree growth regressive model to set the tree parameters including DBH (dt), tree height (H). However, the relationship between canopy height (Hc) and trunk height (Ht) is
Molecular clouds outside the solar circle in the first quadrant of our galaxy
International Nuclear Information System (INIS)
We report the detection of extensive low-level CO emission from molecular clouds well outside the solar circle, in the longitude range 550--950. Three strips, at b = 1.3, 1.5, and 1.7, were mapped at intervals of 0.1 in l, covering the LSR velocity range of -10 to -135 km s-1. Maps from the 1.5 strip are presented here. Armlike concentrations are evident, including an extension of the Perseus arm into the first quadrant and a well-defined arm 15 kpc from the galactic center. It is estimated that the amount of molecular material in the outer Galaxy could be comparable to that in the ''molecular ring'' though spread out over a larger area. Detailed maps of five regions show cloud complexes 60--80 pc long, containing one or more localized CO peaks
Iris unwrapping using the Bresenham circle algorithm for real-time iris recognition
Carothers, Matthew T.; Ngo, Hau T.; Rakvic, Ryan N.; Broussard, Randy P.
2015-02-01
An efficient parallel architecture design for the iris unwrapping process in a real-time iris recognition system using the Bresenham Circle Algorithm is presented in this paper. Based on the characteristics of the model parameters this algorithm was chosen over the widely used polar conversion technique as the iris unwrapping model. The architecture design is parallelized to increase the throughput of the system and is suitable for processing an inputted image size of 320 × 240 pixels in real-time using Field Programmable Gate Array (FPGA) technology. Quartus software is used to implement, verify, and analyze the design's performance using the VHSIC Hardware Description Language. The system's predicted processing time is faster than the modern iris unwrapping technique used today∗.
Measurement of the neutron intensity data using the HANARO four circle diffractometer
International Nuclear Information System (INIS)
As the four circle diffractometer(FCD) has been set up in HANARO, it has become possible to study single crystal structures by means of the neutron diffraction. By introducing the constitution and characteristics of FCD, it has been shown that the feature of neutron diffraction experiment are different from that of X-ray or electronic beam. Besides we have explained the processes of determining experimental information in order to acquire intensity data and constructed the experimental system based on geometry of the FCD. As the computer programme performing all experimental processes automatically has been installed and the accuracy of experimental processes were confirmed by KCl single crystal experiment, the original experimental system for single crystal experiments and analyses by the neutron diffraction method using FCD has been established. (Author). 12 refs., 2 tabs., 11 figs
Rigid motions: Action-angles, relative cohomology and polynomials with roots on the unit circle
Françoise, J.-P.; Garrido, P. L.; Gallavotti, G.
2013-03-01
Revisiting canonical integration of the classical solid near a hyperbolic or elliptic uniform rotation, normal canonical coordinates p, q are constructed so that the Hamiltonian becomes a function ("normal form") of x+ = pq or of x- = p2 + q2: the two cases are treated simultaneously distinguishing them, respectively, by a label a = ±, in terms of various power series with coefficients which are shown to be polynomials in a variable r^2_a depending on the inertia moments. The normal forms are derived via the analysis of a relative cohomology problem and shown to be obtainable without reference to the construction of the normal coordinates via elliptic integrals (unlike the derivation of the normal coordinates p, q). Results and conjectures also emerge about the properties of the above polynomials and the location of their roots. In particular a class of polynomials with all roots on the unit circle arises.
The stochastic dance of circling sperm cells: sperm chemotaxis in the plane
Energy Technology Data Exchange (ETDEWEB)
Friedrich, B M; Juelicher, F [Max Planck Institute for the Physics of Complex Systems, Noethnitzer Strasse 38, 01187 Dresden (Germany)], E-mail: ben@pks.mpg.de, E-mail: julicher@pks.mpg.de
2008-12-15
Biological systems such as single cells must function in the presence of fluctuations. It has been shown in a two-dimensional experimental setup that sea urchin sperm cells move toward a source of chemoattractant along planar trochoidal swimming paths, i.e. drifting circles. In these experiments, a pronounced variability of the swimming paths is observed. We present a theoretical description of sperm chemotaxis in two dimensions which takes fluctuations into account. We derive a coarse-grained theory of stochastic sperm swimming paths in a concentration field of chemoattractant. Fluctuations enter as multiplicative noise in the equations for the sperm swimming path. We discuss the stochastic properties of sperm swimming and predict a concentration-dependence of the effective diffusion constant of sperm swimming which could be tested in experiments.
Determination of the synthetic hydroxyapatite life circle used in dental practice
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Teodorović Nevenka
2012-01-01
Full Text Available Dental materials are specific materials that were developed as a general materials for specific aplication in oral environment. To determinate the functional properties of this materials, we are obligated to use nonstandard approach and specific methods. In this study, two methodologies of material testing-artificial agging and quantification of visual informations for life circle assessment of hydroxyapatite (Hap based materials, were used. Hap was chemically synthetized which produced the material with high purity and crystallinity. Artificially produced Hap is used in stomatology for repair of bone tissue, as a filling for periodontal defects, and as a preservative augmentation for alveolar ridges. In the mean time those materials are used for definitive root canal obturation in endodontic therapy procedure as an apical plug or as complete filling material. This research was focused on the analysis of the bonding properties of the Hap based materials to the root canal walls. The methodology of artificial agging was used together with the quantification of visual informations in purpose to quantify the Hap bonding properties and bonding quality. Experiments were done in-vitro, with the artificia saliva as the agressive agent. The experimental tooths were analyzed by the high resolution optical microscope for the morphological characterisation of the bonding layer. The model for the bond life circle assessment was developed. Hap based materials proved that has favorable properties for the dental use. The presented results proved that the combination of two methodologies (artificial agging and quantification of visual informations could be used as the tool for analyzing the material-dentine interaction.
Social constructions of the male contraception pill: When are we going to break the vicious circle?
Dismore, Lorelle; Van Wersch, Anna; Swainston, Katherine
2016-05-01
Social constructions of men towards the availability of a male hormonal contraceptive, the 'male pill', were explored. A qualitative approach applying semi-structured interviews and scenarios with 22 men (mean age 35 years) from the North East of England revealed two core constructs and six sub-constructs using a Thematic-Construct Analysis in line with the method of Toerien and Wilkinson and Clarke and Kitzinger. Verbal accounts were inductively used to balance the deductively created two core constructs 'Constructing the male pill norm: dominant system of sensemaking' and 'Living by the male pill norm' to represent a normative framework within a changing ideology of shared responsibility in contraceptive choice. Constructing the male pill norm was divided into two sub-constructs: 'Male pill: we are going to join the women and become responsible - too!' and 'Male pill: you look so girly - what are they going to think of me?' The 'Living by the male pill norm' was further divided into four sub-constructs 'Male pill - thank you for giving me promises not to have to become a dad as yet!'; 'Male pill: thank you for the idea of fun - sorry about my morals!'; 'Male pill: in stable relations - yes, I would have you now - sorry, I am too late!' and 'Male pill, we love you - but we are too anxious - we are not ready as yet!' From this male discourse, it is clear that discussions over the male pill follow the line of a vicious circle. In order to establish long-term side effects, Phase IV studies are necessary, and these cannot commence without the male hormonal contraception being a marketable product. So, unless this circle gets broken by some brave men, the male pill will remain a virtual rotating idea for a long time. PMID:24997170
A multitude of variations in the configuration of the circle of Willis: an autopsy study.
Klimek-Piotrowska, Wiesława; Rybicka, Monika; Wojnarska, Aleksandra; Wójtowicz, Agnieszka; Koziej, Mateusz; Hołda, Mateusz K
2016-09-01
The circle of Willis (CW) is an anastomotic system of arteries located at the base of the brain. The aim of the study was to evaluate the anatomic configuration of the CW in the Polish population and to compare results with previously conducted research. Brains were obtained from 100 recently deceased human adults, and the diameters of cerebral vessels were measured using a slide caliper. Cerebral vessels were observed, paying attention to their origin, diameter, typical configuration and variations. Twenty-seven percent of cases presented the typical literature pattern. The remaining 73 % of all cases were atypical; in 16 % the CW was incomplete and in 57 % complete. Atypical findings involved the posterior communicating artery (PcomA), 62 %; anterior communicating artery (AcomA), 22 %; anterior cerebral artery (ACA), 14 %; posterior cerebral artery (PCA), 8 %. The most common variations were bilateral hypoplastic PcomAs (27 % of cases) and unilateral hypoplastic PcomAs (19 % of cases). Only 9 of the 22 types of CW variations classified previously in the literature were observed, and 26 variations (36 cases) in our study were labeled as 'other' type. Mean diameter values for typical CW patterns were internal carotid artery = 3.6 mm, ACA = 2.3 mm, AcomA = 1.9 mm, PCA = 2.2 mm and PcomA = 1.4 mm. Circle of Willis variations have a large impact on clinical practice. This study shows many rare variations that should be taken into consideration to avoid any unexpected complications during surgical procedures involving cerebral vessels. PMID:26439730
Steese, Stephanie; Dollette, Maya; Phillips, William; Hossfeld, Elizabeth; Matthews, Gail; Taormina, Giovanna
2006-01-01
The Girls' Circle is a support group for adolescent girls developed by Beth Hossfeld and Giovanna Taormina as a unique program that addresses the needs of girls by focusing on increasing connections, building empathic skills, and developing resiliency. The present study evaluates the effectiveness of the Girls' Circle intervention on improving…
O'Connor, Eileen
2016-01-01
The study outlined here was an attempt to examine the use of "Circle of Friends" as a single intervention approach in addressing the issue of inappropriate social interactions in a child with Asperger Syndrome. The child selected was in a mainstream setting, as the main feature of a circle of friends is peers supporting peers. The child…
Akarsu, Esra; Yilmaz, Süha
2015-01-01
In this study, it was aimed to study the mathematical language skills that the 7th grade students use in defining the circle and its elements. In the study, the mathematical language skills of students that they use in defining the circle and its elements in a scenario were compared to the mathematical language skills they use in defining them…
无向完全图的哈密顿回路%Hamilton Circles of No Direction Graph
Institute of Scientific and Technical Information of China (English)
梁震; 陈新军
2000-01-01
In this article,a way of finding all Hamilton cycles of a perfect no direction graph will be presented.Then we can find out the formula of all Hamilton circles of a perfect no direction graph.Finally the way will be expanded to other cases like finding whether a graph has Hamilton cycles or not.
Control program of the neutron four-circle-diffractometer P32 at the SILOE reactor/CEN Grenoble
International Nuclear Information System (INIS)
The four-circle diffractometer P32 for elastic neutron scattering on single crystals was installed at the SILOE reactor/CEN Grenoble in 1981. The control program, presented here, is a new update of the former program versions used at the FR2 reactor/Kernforschungszentrum Karlsruhe. Important improvements concerning reliability and handling of the diffractometer are added. (orig.)
Directory of Open Access Journals (Sweden)
Enver TATAR
2014-06-01
Full Text Available The aim of the study was to examine the effects of geometry instruction, which was performed with a dynamic software, on the success of prospective elementary mathematics teachers in the analytical analysis of the circle, and to reveal their opinions in this performed geometry instruction. The embedded research design, which is among the mixed research approaches, was used in the study. The research applied 29 prospective elementary mathematics teachers and the data obtained from circle success test and semi-structured focus group interview form. In view of the analysis of the data, it was observed that the instruction, which was performed with a dynamic software, provided a positive contribution to the success of prospective teachers in the subject of the analytical analysis of the circle. Moreover, it was observed that the prospective teachers expressed that geometry instruction in a dynamic environment enabled them to understand point of power and the points on the circle, and it had positive effects on developing thinking skills, visuality, retention, learning in a short time, concretization and focusing the attention of the students with dynamism. In contrast, it was determined that the use of technology was low in mathematics and geometry courses in the secondary education institutions, and prospective teachers wanted to perform geometry instruction in dynamic environments in their teaching profession.
Torres, Cindy L.
2013-01-01
This study explores the perceived effectiveness of an Inner Circle created ELT professional development program implemented in China. The study begins with a review of historical literature of ELT in China (highlighting changes and challenges in educational reforms), moves into a discussion of the program and curriculum, and ends with a merged…
White, Diana; Donaldson, Brianna; Hodge, Angie; Ruff, Adam
2013-01-01
Math Teachers' Circles have been spreading since their emergence in 2006. These professional development programs, aimed primarily at middle-level mathematics teachers (grades 5-9), focus on developing teachers' mathematical problem solving skills, in line with the Common Core State Standards-Standards of Mathematical Practice. Yet, to…
The fascination for the circle. Commentary on the paragraphs 13, 14 and 15 of The birth of tragedy
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Julián Santos Guerrero
2014-07-01
Full Text Available The article tries to fix the attention on the functioning of the figure of the circle inside the thought of the young Nietzsche of The birth of tragedy. At the same time, in it there is a thesis about the origin of the fascination that the above mentioned figure exercises in the Nietzschean text
Schmidt, S. J.; Parmer, M. S.; Bohn, D. M.
2005-01-01
Large undergraduate classes are a challenge to manage, to engage, and to assess, yet such formidable classes can flourish when student participation is facilitated. One method of generating authentic student involvement is implementation of quality circles by means of a Student Feedback Committee (SFC), which is a volunteer problem-solving and…
2012-02-13
... From the Federal Register Online via the Government Publishing Office SECURITIES AND EXCHANGE COMMISSION In the Matter of Gravity Capital Partners, LLC, 6400 S. Fiddlers Green Circle, Suite 1900, Greenwood Village, CO 80111; Notice of Intention To Cancel Registration Pursuant to Section 203(h) of...
The ability to form full-length intron RNA circles is a general property of nuclear group I introns
DEFF Research Database (Denmark)
Nielsen, Henrik; Fiskaa, Tonje; Birgisdottir, Asa Birna; Haugen, Peik; Einvik, Christer; Johansen, Steinar
2003-01-01
at the expense of the host. The circularization pathway has distinct structural requirements that differ from those of splicing and appears to be specifically suppressed in vivo. The ability to form full-length circles is found in all types of nuclear group I introns, including those from the...
Research circles: A method for the development of knowledge and the creation of change in practice
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Sara Högdin
2014-12-01
Full Text Available This article contains a presentation of experiences gained of research circles as a participant-based method for the development of knowledge and the creation of change in practice. The starting point is two international projects whose aim is to develop knowledge about the professional work being done with young people who exhibit violent behavior. In the Swedish sub-studies, research circles are used as a method for developing such knowledge as well as for creating change in practice. The research circle as a method has its theoretical starting point in action research and participant-oriented research. The results of the study illustrate how research circles can contribute to the creation of a knowledge process through the dialogue in the group and the facilitation of reflection over different work approaches in one’s own work, even if it is a method that does not suit everyone. The results also show that the research circle can lead to a change process in the actual work by enhancing transprofessional collaboration and leading to an increase in the participants’ awareness and evaluation of their work with violent children and young people. Este artigo contém uma apresentação de experiências adquiridas com círculos de investigação como método participante capaz de gerar conhecimento e mudança de práticas. Dois projetos internacionais constituem o nosso ponto de partida, cujo objetivo foi o de produzir conhecimento sobre o trabalho profissional que está a ser feito com os jovens que apresentam comportamento violento. Nos sub-estudos suecos, os círculos de investigação são usados como um método para o desenvolvimento de tais conhecimentos, bem como para proporcionar mudança de práticas. O círculo de investigação como método tem o seu ponto de partida teórico na investigação-ação e na investigação participante. Os resultados do estudo demonstram como os círculos de investigação podem contribuir para a cria
Fahy, Paul; Delassus, Patrick; McCarthy, Peter; Sultan, Sheriff; Hynes, Niamh; Morris, Liam
2014-01-01
The Circle of Willis (CoW) is a complex pentagonal network comprised of fourteen cerebral vessels located at the base of the brain. The collateral flow feature within the circle of Willis allows the ability to maintain cerebral perfusion of the brain. Unfortunately, this collateral flow feature can create undesirable flow impact locations due to anatomical variations within the CoW. The interaction between hemodynamic forces and the arterial wall are believed to be involved in the formation of cerebral aneurysms, especially at irregular geometries such as tortuous segments, bends, and bifurcations. The highest propensity of aneurysm formation is known to form at the anterior communicating artery (AcoA) and at the junctions of the internal carotid and posterior communicating arteries (PcoAs). Controversy still remains as to the existence of blood flow paths through the communicating arteries for a normal CoW. This paper experimentally describes the hemodynamic conditions through three thin walled patient specific models of a complete CoW based on medical images. These models were manufactured by a horizontal dip spin coating method and positioned within a custom made cerebral testing system that simulated symmetrical physiological afferent flow conditions through the internal carotid and vertebral arteries. The dip spin coating procedure produced excellent dimensional accuracy. There was an average of less than 4% variation in diameters and wall thicknesses throughout all manufactured CoW models. Our cerebral test facility demonstrated excellent cycle to cycle repeatability, with variations of less than 2% and 1% for the time and cycle averaged flow rates, respectively. The peak systolic flow rates had less than a 4% variation. Our flow visualizations showed four independent flow sources originating from all four inlet arteries impacting at and crossing the AcoA with bidirectional cross flows. The flow paths entering the left and right vertebral arteries dissipated
Floating Circle of Objects Simulation with the Princeton Ocean Model for the Gulf of Thailand
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Chairote YAIPRASERT
2005-01-01
Full Text Available The Princeton Ocean Model (POM was modified to simulate motion of a group of particles floating on the sea surface in the Gulf of Thailand. The particles in this group were set up so that they formed a circle. The radius reflected uncertainties of longitude and latitude directions while the centre was set at the point of interest. POM was incorporated with tidal forcing on the boundary, which included used current forcing on the inflow by wind velocities, high resolution and realistic ocean bottom topography, temperature and salinity. The model domain for the Gulf of Thailand extended from latitude 3°N-14°N and longitude 99°E-109°E. A horizontal grid resolution of 0.1 degree (approximately 11.1 km was used in the model. Therefore, the grids consisted of 101×111 cells. Twenty one levels in sigma coordinate were used in vertical resolution. The model results were verified using TOPEX/Poseidon and JASON satellite data. The results of the simulation were used to gain a better understanding of the sea current and object movement patterns in the Gulf of Thailand.
The Utopia of Unified Science: The Political Struggle of Otto Neurath and the Vienna Circle
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Ivan Ferreira da Cunha
2013-08-01
Full Text Available Neurath’s approach to the problem of the unity of science is different from conceptions we may call traditional, to know, those that consider that what unites in one single concept the diverse sciences is the adoption of a method, or those that defend that this is carried through by certain characteristics which can be found in the body of knowledge considered scientific. Neurath’s stance also diverges from the standpoint that there is no unifying factor for science, that is, the view that the different sciences are only classified under such concept because of the historical origin of such activities. Neurath’s proposal is to consider science as an attitude, a posture in relation to the problems of the world, the scientific world-conception. This text presents such approach in connection to the aspect of social transformation that can be found in Neurath’s thought. This is done following a comprehension of the ideas of the Vienna Circle, seeking to understand a continuity among the ideas of the members of such group, especially Neurath and Carnap. The present text aims, as well, at recovering the Neurathian idea that we can use a philosophical approach to science to struggle against the problems of the world.
The historicity of the circle of the Twelve: All roads lead to Jerusalem1
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Andries van Aarde
1999-01-01
Full Text Available The aricle consists ofive argumentaive sections. The first deals with the textual evidence with regard to the expressions "disciples", "the Twelve" and "apostles". In the second section it is argued that Jesus did not create the idea of "the Twelve". Firstly, the argument focuses on a discussion of the differences and similarities in the lists of twelve names found in the synopic gospels, Acts and the Sayings Gospel Q and, secondly, of the so-called "minor agreement" between Mathew (19:28 and Luke (22:30 with regard to the expressions the "twelve thrones" and the "twelve tribes of Israel". The investigation concludes that all roads lead to Jerusalem with regard to the historicity of the circle of the Twelve. Section three discusses the situaion in pre-70 CE Jerusalem where the earliest Jesus faction linked the idea of "the Twelve" with there surrection of Jesus and the appearances tradition. It is argued that the appearances tradition coincides negaively with an endeavour among leaders of the Jesus movement to seek positions of power and, positively, with the spread of the gospel to people who were previously considered to be excludedfrom being children of God.
Bista, Suman Raj; Sárándi, István.; Dogan, Serkan; Astvatsatourov, Anatoli; Mösges, Ralph; Deserno, Thomas M.
2013-02-01
Computer-aided diagnosis is developed for assessment of allergic rhinitis/rhinoconjunctivitis measuring the relative redness of sclera under application of allergen solution. Images of the patient's eye are taken using a commercial digital camera. The iris is robustly localized using a gradient-based Hough circle transform. From the center of the pupil, the region of interest within the sclera is extracted using geometric anatomy-based apriori information. The red color pixels are extracted thresholding in the hue, saturation and value color space. Then, redness is measured by taking mean of saturation projected into zero hue. Evaluation is performed with 98 images taken from 14 subjects, 8 responders and 6 non-responders, which were classified according to an experienced otorhinolaryngologist. Provocation is performed with 100, 1,000 and 10,000 AU/ml allergic solution and normalized to control images without provocation. The evaluation yields relative redness of 1.01, 1.05, 1.30 and 0.95, 1.00, 0.96 for responders and non-responders, respectively. Variations in redness measurements were analyzed according to alteration of parameters of the image processing chain proving stability and robustness of our approach. The results indicate that the method improves visual inspection and may be suitable as reliable surrogate endpoint in controlled clinical trials.
Finite element modeling of the Circle of Willis from magnetic resonance data
Cebral, Juan R.; Castro, Marcelo; Soto, Orlando; Loehner, Rainald; Yim, Peter J.; Alperin, Noam
2003-05-01
This paper presents a methodology to construct realistic patient-specific computational fluid dynamics models of the circle of Willis (CoW) using magnetic resonance angiography (MRA) data. Anatomical models are reconstructed from MRA images using tubular deformable models along each arterial segment and a surface-merging algorithm. The resulting models are smoothed and used to generate finite element (FE) grids. The incompressible Navier-Stokes equations are solved using a stabilized FE formulation. Physiologic flow conditions are derived from phase-contrast MR velocity measurements. The methodology was tested on image data of a normal volunteer. A pulsatile flow solution was obtained. Measured flow rates were prescribed in the internal carotid arteries, vertebral arteries, middle cerebral arteries and anterior cerebral arteries. Pressure boundary conditions were imposed in the posterior cerebral arteries. Visualizations of the complex flow patterns and wall shear stress distributions were produced. Potential applications of these FE models include: study the role of the communicating arteries during arterial occlusions and after endovsascular interventions, calculate transport of drugs, evaluate accuracy of 1D flow models, and evaluate vascular bed models used to impose boundary conditions when flow data is unavailable or incomplete.
Variation in the pattern of circle of willis in human brain - A morphological study and review
Directory of Open Access Journals (Sweden)
Iman Sinha
2014-01-01
Full Text Available Background: Variation of “Circulus Arteriosus” is frequent. Knowledge of the variations of vascular anatomy of Circle of Willis will guide the neurosurgeons during intracranial surgery. Objectives: This is an analytical study, where the aim of our study is to analyze the variations regarding shape, symmetry, length and diameters of the component arteries. The study also includes other variations like absence, duplication and abnormal origin of component arteries. Methods: In the present study 80 specimens of human brains of both sexes, aged between 20-60 years are obtained from voluntary body donation at the Department of Anatomy and fresh corpses undergoing autopsy at the Department of Forensic and State Medicine in a teaching hospital in Kolkata. Careful observation & measurement of the component arteries are done after proper preservation and necessary dissection. The findings are then recorded and analyzed. Results: 62 out of total 80 specimens (77.5% have been found to be complete, symmetrical and having normal length and caliber. 7 specimens (6.25% were incomplete and not heptagonal in shape. Conclusion: Out of 22.5% variations most of the variations are seen in posterior communicating artery (10%, followed by anterior cerebral artery (6.25% and anterior communicating artery (6.25%. Most common type of variation is hypoplasia.
Institute of Scientific and Technical Information of China (English)
Zhi-Juan Cao; Qian-Wen Peng; Xue Qiu; Cai-Yun Liu; Jian-Zhong Lu
2011-01-01
A robust, selective and highly sensitive chemiluminescent （CL） platform for protein assay was presented in this paper. This novel CL approach utilized rolling circle amplification （RCA） as a signal enhancement technique and the 96-well plate as the immobilization and separation carrier. Typically, the antibody immobilized on the surface of 96-well plate was sandwiched with the protein target and the aptamer-primer sequence. This aptamer-primer sequence was then employed as the primer of RCA. Based on this design, a number of the biotinylated probes and streptavidin-horseradish peroxidase （SA-HRP） were captured on the plate, and the CL signal was amplified. In summary, our results demonstrated a robust biosensor with a detection limit of 10 fM that is easy to be established and utilized, and devoid of light source. Therefore, this new technique .will broaden the perspective for future development of DNA-based biosensors for the detection of other protein biomarkers related to clinical diseases, by taking advantages of high sensitivity and selectivity.
On the organizing role of nonmuscular forces during performance of a giant circle in gymnastics.
Sevrez, Violaine; Rao, Guillaume; Berton, Eric; Bootsma, Reinoud J
2012-02-01
Five elite gymnasts performed giant circles on the high bar under different conditions of loading (without and with 6-kg loads attached to the shoulders, waist or ankles). Comparing the gymnasts' kinematic pattern of movement with that of a triple-pendulum moving under the sole influence of nonmuscular forces revealed qualitative similarities, including the adoption of an arched position during the downswing and a piked position during the upswing. The structuring role of nonmuscular forces in the organization of movement was further reinforced by the results of an inverse dynamics analysis, assessing the contributions of gravitational, inertial and muscular components to the net joint torques. Adding loads at the level of the shoulders, waist or ankles systematically influenced movement kinematics and net joint torques. However, with the loads attached at the level of the shoulders or waist, the load-induced changes in gravitational and inertial torques provided the required increase in net joint torque, thereby allowing the muscular torques to remain unchanged. With the loads attached at the level of the ankles, this was no longer the case and the gymnasts increased the muscular torques at the shoulder and hip joints. Together, these results demonstrate that expert gymnasts skillfully exploit the operative nonmuscular forces, employing muscle force only in the capacity of complementary forces needed to perform the task. PMID:21975422
Dimensional Synthesis of a 3-DOF Parallel Manipulator with Full Circle Rotation
Institute of Scientific and Technical Information of China (English)
NI Yanbing; WU Nan; ZHONG Xueyong; ZHANG Biao
2015-01-01
Parallel robots are widely used in the academic and industrial fields. In spite of the numerous achievements in the design and dimensional synthesis of the low-mobility parallel robots, few research efforts are directed towards the asymmetric 3-DOF parallel robots whose end-effector can realize 2 translational and 1 rotational(2T1R) motion. In order to develop a manipulator with the capability of full circle rotation to enlarge the workspace, a new 2T1R parallel mechanism is proposed. The modeling approach and kinematic analysis of this proposed mechanism are investigated. Using the method of vector analysis, the inverse kinematic equations are established. This is followed by a vigorous proof that this mechanism attains an annular workspace through its circular rotation and 2 dimensional translations. Taking the first order perturbation of the kinematic equations, the error Jacobian matrix which represents the mapping relationship between the error sources of geometric parameters and the end-effector position errors is derived. With consideration of the constraint conditions of pressure angles and feasible workspace, the dimensional synthesis is conducted with a goal to minimize the global comprehensive performance index. The dimension parameters making the mechanism to have optimal error mapping and kinematic performance are obtained through the optimization algorithm. All these research achievements lay the foundation for the prototype building of such kind of parallel robots.
Dimensional synthesis of a 3-DOF parallel manipulator with full circle rotation
Ni, Yanbing; Wu, Nan; Zhong, Xueyong; Zhang, Biao
2015-07-01
Parallel robots are widely used in the academic and industrial fields. In spite of the numerous achievements in the design and dimensional synthesis of the low-mobility parallel robots, few research efforts are directed towards the asymmetric 3-DOF parallel robots whose end-effector can realize 2 translational and 1 rotational(2T1R) motion. In order to develop a manipulator with the capability of full circle rotation to enlarge the workspace, a new 2T1R parallel mechanism is proposed. The modeling approach and kinematic analysis of this proposed mechanism are investigated. Using the method of vector analysis, the inverse kinematic equations are established. This is followed by a vigorous proof that this mechanism attains an annular workspace through its circular rotation and 2 dimensional translations. Taking the first order perturbation of the kinematic equations, the error Jacobian matrix which represents the mapping relationship between the error sources of geometric parameters and the end-effector position errors is derived. With consideration of the constraint conditions of pressure angles and feasible workspace, the dimensional synthesis is conducted with a goal to minimize the global comprehensive performance index. The dimension parameters making the mechanism to have optimal error mapping and kinematic performance are obtained through the optimization algorithm. All these research achievements lay the foundation for the prototype building of such kind of parallel robots.
How to deal with financial risk under the life circles of nuclear power plant
International Nuclear Information System (INIS)
Nuclear power plants don't necessarily form enterprise boundary, in the background of nuclear power booming, what characteristics of financial risk exist in nuclear power plant, how to deal with such financial risk and how to sustain a stable development of nuclear power ? Based on the enterprise boundary theory of transaction fees, the separate of the nuclear power plant owner, engineering company and operating company comply with the cost-efficient principle. The financial risk of the plant owner come from the cash flow characteristics under different life circles of its nuclear power plants, due to the passivation of the asset structure in the construction and early operation periods, considering the effects of asset structure on financial risk is meaningless. Based on the owners with single reactor or constructing reactors, big-scale investment holding company is needed to conduct professional asset management, and to diversify the financial risk, on the other hand, professional engineering and operation companies can realize the scale and the multi-reactor advantages. (author)
Longitudinal Vibration Characteristics Required to Cut a Circle by Ultrasonic Vibration
Takuya Asami,; Hikaru Miura,
2010-07-01
Currently, lasers and water jets are used to cut circles in brittle materials such as ceramics. However, a disadvantage of these methods is that the conventional equipment is large and complex. To resolve this issue, a method using the ultrasonic vibration of a hollow-type stepped horn for cutting is developed. We consider that this equipment can be simplified and miniaturized. The shape of the hollow-type stepped horn and the characteristics of the longitudinal vibration required to obtain excellent cutting properties were examined. As a result, the most appropriate depth of the hollow part is one-quarter of the wavelength for a hollow-type stepped horn that vibrates longitudinally. The amplification factor is proportional to the cross-sectional ratio providing the cross-sectional ratio does not exceed 4.6. The characteristics of the longitudinal vibration of the hollow-type stepped horn when the static pressing force at the tip of the horn is varied were also examined. It was clarified that the ultrasonic vibration of a hollow-type stepped horn can be used to cut brittle materials.
Circles of Consensus: The Preservation of Cultural Diversity through Political Processes
Directory of Open Access Journals (Sweden)
Jordi Jaria i Manzano
2012-01-01
Full Text Available Western modern culture has expanded at the universal level and has thereby become a threat to other cultures, particularly those of chthonic communities. But these cultures have progressively recognized its worth as a source of richness, which can be very useful in facing future challenges to humanity. Moreover, in terms of human dignity and the equality of all human beings, Western modern culture has to be recognized as having an intrinsic value as well. Given these facts, we must find a way to protect this cultural diversity in an effective manner. It is obvious that assimilationist or isolationist models are not satisfactory. So I propose a third way. I call it an integrationist or a deep approach. It consists of giving political density to cultural diversity through the design of federalist strategies that have, as a result, the definition of different levels of decision (circles of consensus. After having exposed my model, I will pay attention to the recent constitutional experiences in Ecuador and Bolivia, where some new developments in this sense are intended. I compare these models with my proposal and, finally, I analyze the main problems that a deep approach to preserving cultural diversity has to face up to.
Joint processing and analysis of seismic gravity measurements in Capital Circle area
Institute of Scientific and Technical Information of China (English)
JIA Min-yu; MA Li; LIU Shao-ming; ZHANG Jing; SUN Shao-an; WANG Wu-xing
2006-01-01
In Capital Circle area, there are three groups of repeated gravity measurements observed by different institutes using different instruments or methods. The simultaneous adjustment of absolute and relative measurements and the elimination of systematic error among the relative measurements have been carried out in this paper. Thus an unified temporal gravity change system with absolute reference has been established. On the basis of this, the crustal subsidence effect on gravity, which belongs to non-tectonic factor, is analyzed and the station displacement corrections are carried out, so that the long-wave disturbance is eliminated. So far our following aims are realized:the advantages of the absolute and relative measurement methods are complementary to each other; the contradiction and environment disturbance are eliminated; the amounts of information are enlarged; the sampling interval of time domain is compressed. In a word, the ability of identifying the tectonic activity process is enhanced. The results show that: there are systematic errors between the two groups of relative measurements and within the data of 10 campaigns; the uneven local crustal subsidence in the southeast of the study area results in a linear rise of gravity value at 10 stations; they can be corrected by the regression analysis. The maps of revised temporal gravity change can obviously and integrally reflect the Ms=5.0 earthquake in Guye on October 6, 1995.
Two vicious circles contributing to a diagnostic delay for tuberculosis patients in Arkhangelsk
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Vladimir N. Kuznetsov
2014-08-01
Full Text Available Setting: Delay in tuberculosis (TB diagnosis increases the infectious pool in the community and the risk of development of resistance of mycobacteria, which results in an increased number of deaths. Objective: To describe patients’ and doctors’ perceptions of diagnostic delay in TB patients in the Arkhangelsk region and to develop a substantive model to better understand the mechanisms of how these delays are linked to each other. Design: A grounded theory approach was used to study the phenomenon of diagnostic delay. Patients with TB diagnostic delay and doctors–phthisiatricians were interviewed. Results: A model named ‘sickness trajectory in health-seeking behaviour among tuberculosis patients’ was developed and included two core categories describing two vicious circles of diagnostic delay in patients with TB: ‘limited awareness of the importance to contact the health system’ and ‘limited resources of the health system’ and the categories: ‘factors influencing health-seeking behaviour’ and ‘factors influencing the health system effectiveness’. Men were more likely to report patient delay, while women were more likely to report health system delay. Conclusions: To involve people in early medical examinations, it is necessary to increase alertness on TB among patients and to improve health systems in the districts.
Peeling-Ballooning Mode Analysis in Shifted-Circle Tokamak Equilibria
Burke, B.; Kruger, S. E.; Hegna, C. C.; Snyder, P. B.; Sovinec, C. R.; Zhu, P.
2009-11-01
Progress in understanding edge localized modes (ELMs) has been made by investigating the stability properties of edge localized peeling-ballooning modes. We focus on the evolution of ideal MHD modes over a large spectrum in two shifted-circle tokamak equilibria, using the extended-MHD code NIMROD. The TOQ-generated equilibria model a H-mode plasma with a pedestal pressure profile and parallel edge currents. A vacuum region is prescribed by a resistivity profile that transitions from a small to very large value at a specified location. The vacuum model is benchmarked against the linear ideal MHD codes ELITE & GATO. We demonstrate vacuum effects on the stability by adjusting the vacuum location relative to the pedestal pressure region. Ballooning-like instabilities dominate distant vacuum cases, whereas peeling mode physics is expected to dominate as the vacuum approaches the pedestal. Numerical simulations of the early nonlinear stages of edge localized MHD instabilities are presented. Comparisons between equilibria that have ``ballooning'' dominated instabilities relative to equilibria that are ``peeling'' dominated are made.
Evidence-based interventions for reading and language difficulties: creating a virtuous circle.
Snowling, Margaret J; Hulme, Charles
2011-03-01
BACKGROUND. Children may experience two very different forms of reading problem: decoding difficulties (dyslexia) and reading comprehension difficulties. Decoding difficulties appear to be caused by problems with phonological (speech sound) processing. Reading comprehension difficulties in contrast appear to be caused by problems with 'higher level' language difficulties including problems with semantics (including deficient knowledge of word meanings) and grammar (knowledge of morphology and syntax). AIMS. We review evidence concerning the nature, causes of, and treatments for children's reading difficulties. We argue that any well-founded educational intervention must be based on a sound theory of the causes of a particular form of learning difficulty, which in turn must be based on an understanding of how a given skill is learned by typically developing children. Such theoretically motivated interventions should in turn be evaluated in randomized controlled trials (RCTs) to establish whether they are effective, and for whom. RESULTS. There is now considerable evidence showing that phonologically based interventions are effective in ameliorating children's word level decoding difficulties, and a smaller evidence base showing that reading and oral language (OL) comprehension difficulties can be ameliorated by suitable interventions to boost vocabulary and broader OL skills. CONCLUSIONS. The process of developing theories about the origins of children's educational difficulties and evaluating theoretically motivated treatments in RCTs, produces a 'virtuous circle' whereby theory informs practice, and the evaluation of effective interventions in turn feeds back to inform and refine theories about the nature and causes of children's reading and language difficulties. PMID:21391960
Guo, Limin; Hao, Lihua; Zhao, Qiang
2016-07-01
We describe a sensitive aptamer-based sandwich assay for protein detection on microplate by using rolling circle amplification (RCA) coupled with thrombin catalysis. This assay takes advantage of RCA generating long DNA oligonucleotides with repeat thrombin-binding aptamer sequence, specific aptamer affinity binding to achieve multiple thrombin labeling, and enzyme activity of thrombin for signal generation. Protein target is specifically captured by antibody-coated microplate. Then, an oligonucleotide containing an aptamer for protein and a primer sequence is added to form a typical sandwich structure. Following a template encoded with complementary sequence of aptamer for thrombin, RCA reaction extends the primer sequence into a long oligonucleotide. Many thrombin molecules bind with the RCA product. Thrombin catalyzes the conversion of its chromogenic or fluorogenic peptide substrates into detectable products for final quantification of protein targets. We applied this strategy to the detection of a model protein target, platelet-derived growth factor-BB (PDGF-BB). Due to double signal amplifications from RCA and thrombin catalysis, this assay enabled the detection of PDGF-BB as low as 3.1 pM when a fluorogenic peptide substrate was used. This assay provides a new way for signal generation in RCA-involved assay through direct thrombin labeling, circumventing time-consuming preparation of enzyme-conjugate and affinity probes. This method has promise for a variety of analytical applications. PMID:27108282
Full-Circle Color Panorama of Phoenix Lander Deck and Landing Site on Northern Mars, Animation
2008-01-01
[figure removed for brevity, see original site] Click on image to view the animation This view combines more than 500 images taken after NASA's Phoenix Mars Lander arrived on an arctic plain at 68.22 degrees north latitude, 234.25 degrees east longitude on Mars. This movie makes a slow tour around highlights of the image including the landscape and the spacecraft's science deck. The full-circle panorama in approximately true color shows the polygonal patterning of ground at the landing area, similar to patterns in permafrost areas on Earth. The center of the image is the westward part of the scene. Trenches where Phoenix's robotic arm has been exposing subsurface material are visible in the right half of the image. The spacecraft's meteorology mast, topped by the telltale wind gauge, extends into the sky portion of the panorama. This view comprises more than 100 different Stereo Surface Imager camera pointings, with images taken through three different filters at each pointing. It is presented here as a cylindrical projection. The Phoenix Mission is led by the University of Arizona, Tucson, on behalf of NASA. Project management of the mission is by NASA's Jet Propulsion Laboratory, Pasadena, Calif. Spacecraft development is by Lockheed Martin Space Systems, Denver.
A New Look at Chern-Simons on Circle Bundles I: The Caloron Correspondence
Mickler, Ryan
2015-01-01
We consider Chern-Simons theory on 3-manifold $M$ that is the total space of a circle bundle over a 2d base $\\Sigma$. We show that this theory is equivalent to a new 2d TQFT on the base, which we call Caloron BF theory, that can be obtained by an appropriate type of push-forward. This is a gauge theory on a bundle with structure group given by the full affine level $k$ central extension of the loop group $LG$. The space of fields of this 2d theory is naturally symplectic, and this provides a new formulation of a result of Beasley-Witten about the equivariant localization of the Chern-Simons path integral. The main tool that we employ is the Caloron correspondence, originally due to Murray-Garland, that relates the space of gauge fields on $M$ with a certain enlarged space of connections on an equivariant version of the loop space of the $G$-bundle. We show that the symplectic structure that Beasley-Witten found is related to a looped version of the Atiyah-Bott construction in 2-dimensional Yang-Mills theory. ...
On a subject of diverse improvisations The uncertainty relations on a circle
Dumitru, S
2002-01-01
The disputed question of uncertainty relations (UR) on a circle is regarded as a particular element of a more general problem which refers to the quantum description of angular observables $L_z$ and $\\phi$. The improvised $L_z$ UR are found to be affected by unsourmontable shortcomings. Also in contradiction with a largely accepted belief it is proved that the usual procedures of quantum mechanics are accurately applicable for the $L_z-\\phi$ pair. The applicability regards both the known circular motions and the less known non-circular rotational motions. The presented facts contribute as arguments to the following indubitable conclusions: (i) the traditional interpretation of UR must be denied as an incorrect doctrine, (ii) for a natural physical consideration of the the $L_z-\\phi$ pair the results from the usual quantum mechanics are sufficient while the improvised $L_z-\\phi$ UR must be rejected as senseless formulas and (iii) the descriptions of quantum measurements have to be done in a framework which is ...
Open cluster survival within the solar circle: Teutsch145 and Teutsch146
Bonatto, Charles; Barbuy, Beatriz; Bica, Eduardo
2009-01-01
Teutsch145 and Teutsch146 are shown to be open clusters (OCs) orbiting well inside the Solar circle, a region where several dynamical processes combine to disrupt most OCs on a time-scale of a few 10^8yrs. BVI photometry from the GALILEO telescope is used to investigate the nature and derive the fundamental and structural parameters of the optically faint and poorly-known OCs Teutsch145 and 146. These parameters are computed by means of field-star decontaminated colour-magnitude diagrams (CMDs) and stellar radial density profiles (RDPs). Cluster mass estimates are made based on the intrinsic mass functions (MFs). We derive the ages 200+100-50Myr and 400+/-100Myr, and the distances from the Sun 2.7+/-0.3kpc and 3.8+/-0.2kpc, respectively for Teutsch145 and 146. Their integrated apparent and absolute magnitudes are m_V ~ 12.4, m_V ~ 13.3, M_V ~- 5.6 and M_V ~- 5.3. The MFs (detected for stars with m>1Msun) have slopes similar to Salpeter's IMF. Extrapolated to the H-burning limit, the MFs would produce total st...
Going around in a Circle: A Norwegian Study of Suicidal Experiences in Old Age
Holm, Anne Lise; Lyberg, Anne; Berggren, Ingela; Åström, Sture; Severinsson, Elisabeth
2014-01-01
Depression has repeatedly been found to be a risk factor for completed suicide, particularly when coupled with a pervasive sense of hopelessness. The aim of this study was to evaluate depressed older persons' suicidal experiences. Data were collected by means of individual in-depth interviews with nine informants living in two districts of Norway. A hermeneutic analysis was performed. One main theme: Going around in a circle and two themes: being alone without meaning in life and struggling to achieve reconciliation emerged from the analysis. An important implication for mental healthcare practice is the need to develop a person's ability to shape and take control of her/his life. The healthcare organisation must be committed to a plan that sets out strategies enabling suicidal individuals to avoid the negative experience of meaninglessness. It was concluded that suicidal depressed elderly persons need help to escape from their desperate situation. More research is urgently required in order to prevent suicide in depressed elderly persons whose emotional pain is unbearable. PMID:25574387
International Nuclear Information System (INIS)
We report on a novel strategy for the electrochemical detection of cocaine. It is based on the use of a supramolecular aptamer, rolling circle amplification (RCA), and multiplex binding of a biotin-strepavidin system. The aptamer fragments were assembled to a supramolecular aptamer which, in the presence of cocaine, conjugates to streptavidin for anchoring of biotinylated circular DNA. This initiates RCA and enables sensitive electrochemical-enzymatic readout. A significant signal amplification was obtained by using streptavidin linked to alkaline phosphatase that binds to the remaining biotinylated detection probes and catalyzes the hydrolysis of the synthetic enzyme substrate α-naphthylphosphate. This dual amplification strategy tremendously increases the detection limit of the aptasensor. Under optimal conditions and using differential pulse voltammetry, cocaine can be detected in the concentration range between 2 and 500 nM with a detection limit as low as 1.3 nM (at S/N = 3). The method is specific and acceptably reproducible. It was successfully applied to the detection of cocaine in (spiked) urine samples. The data were in good agreement with those obtained by the GC-MS reference method. (author)
Sagredo, Sandra; de la Cruz, Fernando; Moncalián, Gabriel
2016-01-01
During bacterial conjugation and rolling circle replication, HUH endonucleases, respectively known as relaxases and replicases, form a covalent bond with ssDNA when they cleave their target sequence (nic site). Both protein families show structural similarity but limited amino acid identity. Moreover, the organization of the inverted repeat (IR) and the loop that shape the nic site differs in both proteins. Arguably, replicases cleave their target site more efficiently, while relaxases exert more biochemical control over the process. Here we show that engineering a relaxase target by mimicking the replicase target, results in enhanced formation of protein-DNA covalent complexes. Three widely different relaxases, which belong to MOBF, MOBQ and MOBP families, can properly cleave DNA sequences with permuted target sequences. Collaterally, the secondary structure that the permuted targets acquired within a supercoiled plasmid DNA resulted in poor conjugation frequencies underlying the importance of relaxase accessory proteins in conjugative DNA processing. Our results reveal that relaxase and replicase targets can be interchangeable in vitro. The new Rep substrates provide new bioconjugation tools for the design of sophisticated DNA-protein nanostructures. PMID:27027740
[The age-specific changes in the wall of the arterial circle of Willis].
Trushel', N A; Pivchenko, P G; Bel'chikov, E I
2013-01-01
The objective of the present study was to create the database of morphometric and morphological characteristics of the wall of the vessels of the Willis arterial circle at the site of their bifurcation throughout the period of postnatal ontogenesis in man to be used for the postmortem determination of human age. Preparations of vascular cross sections were used to measure the intima thickness (intimal pads) in the region of lateral bifurcation angles on the terminal branch of the internal carotid and basilar arteries obtained from 130 corpses of the subjects aged between 0 and 75 years. The histological preparations were stained with hematoxylin/eosin and van Gieson's pyrofuchsin or by the Unnar-Tenzer method. Morphometry was performed using a Bioscan image analyser and the Scion Image v.402 software. The Microsoft Excel 2003 package was used for the primary treatment of the data obtained. They were used to draw the table of intimal pads developing throughout the period of postnatal ontogenesis in man that allows for the postmortem determination of approximate human age. The study showed that the thickening of intimal pads and concomitant thinning of the underlying muscular layer during the postnatal ontogenesis should be regarded as being normal age-related changes. PMID:23802302
Analysis on sale quantity circle of plastics spots every month%塑料现货月销售量周期分析
Institute of Scientific and Technical Information of China (English)
姜彦坡
2015-01-01
本文进行了塑料现货月销售量周期分析,存在一定的"痛苦周期"和"幸福周期",希望对各个领域的大宗原材料销售业务人员尤其是石油化工领域的销售业务人员有所启发.%The sale quantity circle of plastic spots every month was analyzed,which existed "torturous circle"and "happyiness circle" and could be as the reference of of sale businessman.
Directory of Open Access Journals (Sweden)
Malenyuk T.V.
2015-04-01
Full Text Available Purpose: to give foundation for effectiveness of training at sport circle as form of trainings’ organization on the base of analysis of shaping influence on morphological functional indicators of girl students of higher educational establishments’ non special faculties. Material: in research 60 girl students of 17-19 yrs age participated. Duration of pedagogic experiment was 8 months. In both groups trainings were conducted twice a week; duration of every training was 60 minutes. Results: we have worked out methodic of shaping training. It was determined that under influence of shaping harmonious physical development takes place, saving character and mobility of cardio vascular system of girl students is realized. Conclusions: author’s methodic of shaping training in sport circles has been developed, which includes aerobic and power exercises, elements of health related gymnastic, stretching and relaxation. This methodic envisages individual control of loading, considering constitution and girls students’ preferences; it includes recommendations concerning eating.
International Nuclear Information System (INIS)
This paper describes a concurrent measurement of spindle radial, axial and angular motions using concentric circle grating and phase modulation interferometers. In the measurement, a concentric circle grating with fine pitch is the reference artifact. A frequency modulated laser diode is used for the light source of the phase modulation interferometers. The phase modulation interferometers, which consist of three Michelson and three grating interferometers, measure three radial and three axial displacements of the grating. From these six measured displacements, radial, axial and angular motions of a spindle can be determined concurrently. In the paper, a measurement principle, a measurement instrument and experimental results are discussed. Concurrent measurements of spindle radial, axial and angular motions were successfully attained. (paper)
Mateu, Cecilia; Aguilar, Luis; Brown, Anthony; Valenzuela, Octavio; Carigi, Leticia; Hernandez, Fabiola; Velazquez, Hector
2011-01-01
We propose an extension of the GC3 streamer finding method of Johnston et al. 1996 that can be applied to the future Gaia database. The original method looks for streamers along great circles in the sky, our extension adds the kinematical restriction that velocity vectors should also be constrained to lie along these great circles, as seen by a Galactocentric observer. We show how to use these combined criteria starting from heliocentric observables. We test it by using the mock Gaia catalogue of Brown et al. 2005, which includes a realistic Galactic background and observational errors, but with the addition of detailed star formation histories for the simulated satellites. We investigate its success rate as a function of initial satellite luminosity, star formation history and orbit. We find that the inclusion of the kinematical restriction vastly enhances the contrast between a streamer and the background, even in the presence of observational errors, provided we use only data with good astrometric quality ...
Low, R L; Kaguni, J M; Kornberg, A
1984-04-10
An exceptionally potent DNA catenation activity, identified in an extract from Escherichia coli, has been purified and partially characterized. Catenation results from the sequential action of the following two polypeptides: beta, 34 kDa and identical to exonuclease III; and alpha, 101 kDa and identical to DNA topoisomerase I (omega protein). An additional requirement is that a small proportion of the circles be nicked in order to provide the substrate for exonuclease III to generate gaps, estimated to be about 100 nucleotides long. Following exonuclease III digestion, one molecule of topoisomerase I can interlock per minute at 30 degrees C about 20 supercoiled and gapped DNA circles into a massively catenated network. The reaction requires Mg2+ and a hydrophilic polymer (polyvinyl alcohol or polyethylene glycol) at about 7%, but neither ATP nor spermidine. The hydrophilic polymer appears to drive catenation by condensing the DNA; decatenation by topoisomerase I proceeds upon removal of the polymer. PMID:6323479
Directory of Open Access Journals (Sweden)
Shankar Rao Naveen
2015-01-01
Full Text Available Background: Anatomy of circle of Willis (CW shows wide variation in different individuals, population groups, and has vital clinical significance in causation and presentation of clinical disease. This study evaluates the anatomical variations, incidence of various common anomalies of CW in south Indian tertiary hospital set up, using three-dimensional time-of-flight (3D-TOF magnetic resonance angiography (MRA. Materials and Methods: A total of 300 patients referred for neuroimaging study over a period of 2-year were included in the analysis. In this prospective and retrospective study, 198 men and 102 women; mean age, 55 years underwent 3D-TOF MR angiograms of the CW using a 1.5-tesla MR scanner. Images were reviewed for anatomical configuration of the CW using maximum intensity projection (MIP and 3D volume rendered images. Results: On analysis, a complete CW was seen in 50 (16.6% of 300 subjects. An incomplete anterior and posterior CW was found in 66 (22% The remaining 184 (61.3% subjects had partially complete CW configuration. The most common type of CW in a single subject was anterior variant type A and posterior type variant E. Conclusion: We observed wide variation in CW configuration in our patients. The prevalence of complete configuration of the circle is 16.6%; slightly higher in females and younger subjects. Complete anterior circle was present in 77.3%. Most common anterior variant is type A (normal anterior configuration with a prevalence of 66%. The most common posterior circle variant is type E (hypoplasia or absence of both PcomA with 32.6%. Overall, CW variants are slightly more common among the women in comparison to men. Incidence of associated anomalies like aneurysm or arteriovenous malformation (AVM was comparable to that described in literature.
Translation as a virtuous circle: a case of borrowing in Arabic and re-borrowing in English
Mohammad Ahmad Thawabteh
2014-01-01
Abstract – Translation has always been viewed as a virtuous circle throughout history. The present paper examines one of the oldest translation strategies, namely borrowing which also come to be employed by language users to fulfill communicative transaction in daily use of the language. The paper also explores re-borrowing as a translation method used by translators to render borrowed words usually integrated in a Source Language (SL) text by SL author to relay his/her ideology via micro-/ma...
Directory of Open Access Journals (Sweden)
Anastasie M. Maponda
2016-07-01
Full Text Available We can understand that the Circle must work on two dimensions to provide a future for new woman theology in Africa. The first dimension is based on the intuitive fundamental and innovative sense of a woman from Ghana, Mercy Amba Oduyoye, that leads to the creation of the Circle: she impulsed the idea that women should make their own theology from their dailylife experiences and their subjectivity as women, in order to think on faith and Gospel in a different way. It is necessary to question that intuitive sense. The second dimension aims to revisit the great personalities of African woman theologians of the Circle. What are the essential points of their research? How has the research changed African theology? I particularly think of Musimbi Kanyoro, Nyambura Njoroge and Musa Dub� in the Africa English zone and Helene Yinda, Liz Vuadi, Kasa Dovi and Bernadette Mbuyi Beya in Africa French zone. The essence of their thinking is still actual and that is why they are good enough to project in to the future.Intradisciplinary and/or interdisciplinary implications: This article presents the history of the Circle of Concerned African Women Theologians from creation to now. Issues related to traditional culture, gender and sexual-based violence, gender-based injustice, and HIV and AIDS are discussed under different approaches such as the biblical approach, hermeneutical approach, ethical approach, historical approach and practical approach. The impact of African Women Theologians speaking French will be particularly highlighted.Keywords: theology; women theologians; women empowerment; HIV/AIDS; gender
Dean, Frank B.; Nelson, John R.; Giesler, Theresa L.; Lasken, Roger S.
2001-01-01
We describe a simple method of using rolling circle amplification to amplify vector DNA such as M13 or plasmid DNA from single colonies or plaques. Using random primers and φ29 DNA polymerase, circular DNA templates can be amplified 10,000-fold in a few hours. This procedure removes the need for lengthy growth periods and traditional DNA isolation methods. Reaction products can be used directly for DNA sequencing after phosphatase treatment to inactivate unincorporated nucleotides. Amplified ...
Toscano Sharyl E
2007-01-01
Abstract Background This paper describes the nature and characteristics of the dating relationships of adolescent females, including any of their experiences of abuse. Methods A grounded theory approach was used with 22 theoretically sampled female adolescents ages 15–18. Results Several important themes emerged: Seven stages of dating consistently described the relationships of female adolescents. A circle consisting of two interacting same sex peer groups provided structure for each teen as...
Circular-harmonic vector analysis of a dielectric waveguide with a cross-cut-circle cross section.
Yang, S C; Kim, H S; Lee, H J
1995-11-20
Vector-wave solutions of dielectric waveguides with cross-cut-circle cross sections, which are commonly produced by reflow of the waveguide core on a planar substrate at high temperature, are rigorously analyzed by the use of the point-matching method. As a numerical example, the propagation constant, electromagnetic-field distribution, and convergence of mode solutions for a semicircular waveguide are presented, and the properties of these modes are discussed. PMID:21060651
Bannister, Michael J.; Devanny, William E.; Eppstein, David; Goodrich, Michael T.
2014-01-01
Many well-known graph drawing techniques, including force directed drawings, spectral graph layouts, multidimensional scaling, and circle packings, have algebraic formulations. However, practical methods for producing such drawings ubiquitously use iterative numerical approximations rather than constructing and then solving algebraic expressions representing their exact solutions. To explain this phenomenon, we use Galois theory to show that many variants of these problems have solutions that...
Directory of Open Access Journals (Sweden)
Mouscadet Jean-François
2005-05-01
Full Text Available Abstract Retroviral integration is central to viral persistence and pathogenesis, cancer as well as host genome evolution. However, it is unclear why integration appears essential for retrovirus production, especially given the abundance and transcriptional potential of non-integrated viral genomes. The involvement of retroviral endonuclease, also called integrase (IN, in replication steps apart from integration has been proposed, but is usually considered to be accessory. We observe here that integration of a retrovirus from the spumavirus family depends mainly on the quantity of viral DNA produced. Moreover, we found that IN directly participates to linear DNA production from 2-LTR circles by specifically cleaving the conserved palindromic sequence found at LTR-LTR junctions. These results challenge the prevailing view that integrase essential function is to catalyze retroviral DNA integration. Integrase activity upstream of this step, by controlling linear DNA production, is sufficient to explain the absolute requirement for this enzyme. The novel role of IN over 2-LTR circle junctions accounts for the pleiotropic effects observed in cells infected with IN mutants. It may explain why 1 2-LTR circles accumulate in vivo in mutants carrying a defective IN while their linear and integrated DNA pools decrease; 2 why both LTRs are processed in a concerted manner. It also resolves the original puzzle concerning the integration of spumaretroviruses. More generally, it suggests to reassess 2-LTR circles as functional intermediates in the retrovirus cycle and to reconsider the idea that formation of the integrated provirus is an essential step of retrovirus production.
Mihn, Byeong-Hee; Lee, Ki-Won; Ahn, Young Sook; Lee, Yong Sam
2015-03-01
During the reign of King Sejong (世宗, 1418-1450) in the Joseon Dynasty, there were lots of astronomical instruments, including miniaturized ones. Those instruments utilized the technical know-how acquired through building contemporary astronomical instruments previously developed in the Song(宋), Jin(金), and Yuan(元) dynasties of China. In those days, many astronomical instruments had circles, rings, and spheres carved with a scale of 365.25, 100, and 24 parts, respectively, on their circumference. These were called the celestial-circumference degree, hundred-interval (Baekgak), and 24 direction, respectively. These scales are marked by the angular distance, not by the angle. Therefore, these circles, rings, and spheres had to be optimized in size to accomodate proper scales. Assuming that the scale system is composed of integer multiples of unit length, we studied the sizes of circles by referring to old articles and investigating existing artifacts. We discovered that the star chart of Cheonsang yeolcha bunyajido was drawn with a royal standard ruler (周尺) based on the unit length of 207 mm. Interestingly, its circumference was marked by the unit scale of 3 puns per 1 du (or degree) like Honsang (a celestial globe). We also found that Hyeonju ilgu (a equatorial sundial) has a Baekgak disk on a scale of 1 pun per 1 gak (that is an interval of time similar to a quarter). This study contributes to the analysis of specifications of numerous circular elements from old Korean astronomical instruments.
Directory of Open Access Journals (Sweden)
Toscano Sharyl E
2007-09-01
Full Text Available Abstract Background This paper describes the nature and characteristics of the dating relationships of adolescent females, including any of their experiences of abuse. Methods A grounded theory approach was used with 22 theoretically sampled female adolescents ages 15–18. Results Several important themes emerged: Seven stages of dating consistently described the relationships of female adolescents. A circle consisting of two interacting same sex peer groups provided structure for each teen as they navigated the dating course. The circle was the central factor affecting a female adolescent's potential for risk or harm in dating relationships. Teens defined abuse as an act where the intention is to hurt. Having once succumbed to sexual pressure, teens felt unable to refuse sex in subsequent situations. Conclusion An awareness of both the stages of dating and the dynamics of the circle will assist health care providers to plan and implement interventions in the female adolescent population. Study findings on factors and influences that support non-abusive versus abusive relationship might help identify female teens at risk and/or support interventions aimed at preventing dating violence.
Finland.
This document is an English-language abstract (approximately 1,500 words) of Finnish legislation dealing with government financing of study circles. In the adult education system of Finland, a study circle is a working unit based on voluntary membership and aimed at fulfilling the educational needs of its members through group studies in…
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.
Rodrigues, Anderson M; Najafzadeh, Mohammad J; de Hoog, G Sybren; de Camargo, Zoilo P
2015-01-01
Sporothrix infections are emerging as an important human and animal threat among otherwise healthy patients, especially in Brazil and China. Correct identification of sporotrichosis agents is beneficial for epidemiological surveillance, enabling implementation of adequate public-health policies and guiding antifungal therapy. In areas of limited resources where sporotrichosis is endemic, high-throughput detection methods that are specific and sensitive are preferred over phenotypic methods that usually result in misidentification of closely related Sporothrix species. We sought to establish rolling circle amplification (RCA) as a low-cost screening tool for species-specific identification of human-pathogenic Sporothrix. We developed six species-specific padlock probes targeting polymorphisms in the gene encoding calmodulin. BLAST-searches revealed candidate probes that were conserved intraspecifically; no significant homology with sequences from humans, mice, plants or microorganisms outside members of Sporothrix were found. The accuracy of our RCA-based assay was demonstrated through the specificity of probe-template binding to 25 S. brasiliensis, 58 S. schenckii, 5 S. globosa, 1 S. luriei, 4 S. mexicana, and 3 S. pallida samples. No cross reactivity between closely related species was evident in vitro, and padlock probes yielded 100% specificity and sensitivity down to 3 × 10(6) copies of the target sequence. RCA-based speciation matched identifications via phylogenetic analysis of the gene encoding calmodulin and the rDNA operon (kappa 1.0; 95% confidence interval 1.0-1.0), supporting its use as a reliable alternative to DNA sequencing. This method is a powerful tool for rapid identification and specific detection of medically relevant Sporothrix, and due to its robustness has potential for ecological studies. PMID:26696992
Directory of Open Access Journals (Sweden)
Anderson Messias Rodrigues
2015-12-01
Full Text Available Sporothrix infections are emerging as an important human and animal threat among otherwise healthy patients, especially in Brazil and China. Correct identification of sporotrichosis agents is beneficial for epidemiological surveillance, enabling implementation of adequate public-health policies and guiding antifungal therapy. In areas of limited resources where sporotrichosis is endemic, high-throughput detection methods that are specific and sensitive are preferred over phenotypic methods that usually result in misidentification of closely related Sporothrix species. We sought to establish rolling circle amplification (RCA as a low-cost screening tool for species-specific identification of human-pathogenic Sporothrix. We developed six species-specific padlock probes targeting polymorphisms in the gene encoding calmodulin. BLAST-searches revealed candidate probes that were conserved intraspecifically; no significant homology with sequences from humans, mice, plants or microorganisms outside members of Sporothrix were found. The accuracy of our RCA-based assay was demonstrated through the specificity of probe-template binding to 25 S. brasiliensis, 58 S. schenckii, 5 S. globosa, 1 S. luriei, 4 S. mexicana, and 3 S. pallida samples. No cross reactivity between closely related species was evident in vitro, and padlock probes yielded 100% specificity and sensitivity down to 3 x 10 6 copies of the target sequence. RCA-based speciation matched identifications via phylogenetic analysis of the gene encoding calmodulin and the rDNA operon (kappa 1.0; 95% confidence interval 1.0-1.0, supporting its use as a reliable alternative to DNA sequencing. This method is a powerful tool for rapid identification and specific detection of medically relevant Sporothrix, and due to its robustness has potential for ecological studies.
Long term depression of MNTB-LSO synapses is expressed postsynaptically in developing circling mice.
Pradhan, Jonu; Maskey, Dhiraj; Ahn, Seung Cheol
2012-11-30
Early onset long term depression (LTD) during the first postnatal week has rarely been demonstrated at the medial nucleus of trapezoid body (MNTB) - lateral superior olive (LSO) synapses in spite of many favorable conditions, such as depolarizing synapses and glutamate co-release from MNTB terminals. Thus, we tested the early expression of LTD at MNTB-LSO synapses during the first postnatal week using circling mice, whose main transmitter is glutamate at MNTB-LSO synapses. Tetanic stimulation on MNTB elicited LTD of postsynaptic currents recorded at LSO neurons in P0-P3 homozygous (cir/cir) mice (45.8 ± 0.3% of the control, n = 7) and heterozygous (+/cir) mice (43.3 ± 0.4% of the control, n = 7). The magnitude of LTD decreased in P8-P12 heterozygous (+/cir) mice (84.5 ± 0.3% of the control, n = 7), but was maintained in P8-P12 homozygous (cir/cir) mice (38.2 ± 0.3% of the control, n = 9). Glutamatergic LTD observed in homozygous (cir/cir) mice and glycinergic LTD observed heterozygous (+/cir) mice showed similar pattern of change. As currents induced by the pressure application of glycine on LSO neurons were reduced by tetanic stimulation in P0-P3 heterozygous (+/cir) mice, LTD was thought to occur at postsynaptic sites. Our results suggest that LTD might occur in vivo and participate in the synaptic silencing and strengthening of MNTB-LSO synapses, which is most active during the first postnatal week. PMID:23041045
Watch out for the blue circle: a breakthrough in family planning promotional strategy.
Sumarsono
1989-07-01
Realizing the potential of commercial marketing in changing the attitude and behavior of the target audience in the early years of the 4th 5-year development plan, the National Family Planning Program tried to develop new ventures in communicating the concept of the small family norm to the people. The condom was chosen as the 1st product to be sold through the social marketing project because male awareness about family planning was still low. Based on audience research, the pricing, packaging, and branding of the product was developed. The most accepted brand name was Dua Lima because it has a neutral meaning, is easily remembered, and can be described in sign language. The last reason is very important because most consumers have difficulty communicating about condoms in the sales outlet. Social marketing has proved effective because of strong public relations activities and the involvement of formal and informal leaders. This experiment has convinced family planning management that social marketing is workable for promoting the small family norm. In 1987, under the new program of self-sufficiency in family planning, the private sector is invited to participate by providing family planning services for target audiences, using the principles of self-sufficiency and self-support. There are 2 principal activities; 1) the IEC campaign, and 2) product (contraceptive) selling. IEC activities include a media campaign public relations work. Product selling is done through commercial channels such as pharmaceutical firms, drug stores, private doctors, and midwives. It was decided that the campaign would be aided by a name and logo. The blue circle was chosen because it is unique, communicative, and simple. The social marketing of contraceptives in Indonesia can be considered a breakthrough in communication strategy for a national development program. PMID:12282138
The Circle Of Security Parenting and parental conﬂict: a single case study
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ChiaraPazzagli
2014-08-01
Full Text Available 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 there is a wide range of clinical settings in which child/parent attachment is an important component of assessment there is limited empirical data on when and how attachment based interventions are appropriate for specific clinical profiles and contexts. The aim of this paper is to present a clinical application of COS-P in order to explore and reflect on some specific therapeutic tasks where it works and on some clinical indicators and contexts appropriate for its application. A single case study of a father, “M.” (43 yrs. old in conflict for the custody of his 5yrs old daughter is reported. The Adult Attachment Projective Picture System (AAP, the Parenting Stress Index, the Strengths and Difficulties Questionnaire, and the Parental Alliance Measure, were administered pre- and post-intervention. The clinical signiﬁcance analysis method revealed that numerous changes occurred in the father. The AAP showed improvements in the level of agency of self. M. made gains in his capacity to use internal resources and to increase his agency of self. M. was classified as recovered in his perception of the child’s functioning and as improved in his parenting stress and parenting alliance with the mother. Considerations on specific contexts and clinical indicators for the application of COS-P are proposed.
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Stougaard Magnus
2007-11-01
Full Text Available Abstract Background In situ detection of short sequence elements in genomic DNA requires short probes with high molecular resolution and powerful specific signal amplification. Padlock probes can differentiate single base variations. Ligated padlock probes can be amplified in situ by rolling circle DNA synthesis and detected by fluorescence microscopy, thus enhancing PRINS type reactions, where localized DNA synthesis reports on the position of hybridization targets, to potentially reveal the binding of single oligonucleotide-size probe molecules. Such a system has been presented for the detection of mitochondrial DNA in fixed cells, whereas attempts to apply rolling circle detection to metaphase chromosomes have previously failed, according to the literature. Methods Synchronized cultured cells were fixed with methanol/acetic acid to prepare chromosome spreads in teflon-coated diagnostic well-slides. Apart from the slide format and the chromosome spreading everything was done essentially according to standard protocols. Hybridization targets were detected in situ with padlock probes, which were ligated and amplified using target primed rolling circle DNA synthesis, and detected by fluorescence labeling. Results An optimized protocol for the spreading of condensed metaphase chromosomes in teflon-coated diagnostic well-slides was developed. Applying this protocol we generated specimens for target primed rolling circle DNA synthesis of padlock probes recognizing a 40 nucleotide sequence in the male specific repetitive satellite I sequence (DYZ1 on the Y-chromosome and a 32 nucleotide sequence in the repetitive kringle IV domain in the apolipoprotein(a gene positioned on the long arm of chromosome 6. These targets were detected with good efficiency, but the efficiency on other target sites was unsatisfactory. Conclusion Our aim was to test the applicability of the method used on mitochondrial DNA to the analysis of nuclear genomes, in particular as
Kostiuk, I. R.
2014-01-01
Participation in the activity of scientific circle is one of the forms of students’ research work. The leader should not only interpret the science and serve as a data carrier, but he should be able to organize systemic individual activity of the future scientists. Constant active search for opportunities to improve the quality of educational process in order to train highly qualified dental specialists is conducted according to the credit-module system. As scientific circle is one of the mo...
Rothe, J. Peter; Makokis, Patricia; Steinhauer, Lorna; Aguiar, William; Makokis, Lena; Brertton, George
2012-01-01
Objectives. The study’s objective was to better understand alcohol abuse and impaired driving behaviors in a First Nations community as it reflects systemic issues linked to historical, family and community experiences. Study Design and Methods. Fifteen 18- to 29-year-old drivers participated in an exploratory eight-hour Talking Circle held according to traditional cultural practice. Four First Nations researchers, trained in Talking Circle protocol, and a Band Elder facilitated the data coll...
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Valeska Nahas Guimarães
2007-01-01
Full Text Available This paper is about changes in the business world. The main goal is to study the implications related to people’s creativity expression owing to work organization in small groups in the Ambev S.C. branch. This is a qualitative study based on a case study. 21 self-management circles and 18 quality control circles in the organization were found. The self management circles are responsible for achieving the organizational main goals and the quality control circles to bring best practices and new ideas. The result shows that quality control circles are more powerful than the self management circles as a space to develop people creativity and organizational innovation. It is relevant to stress that in the CCQs there are more multidisciplinary and common purpose guided to a collective objective desired by all the members of the team. On the other hand, in the CGA´s there are more discipline to accept the common tactics to people reach the objectives of the group and the corporative aims. The conclusion is that the changes in the business environment make the small work group very important to a company’s creativity and a fundamental strategy differentiation in the process of work organization in the context of the business world.
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
Billy, C. L.
2003-12-01
For more than three decades, American Indian Tribal Colleges and Universities have been working to sustain what is ours: our land, our language, our communities, and our culture. Tribal Colleges have achieved success by helping our communities, located in some of the poorest and most geographically remote areas of the country, develop systems for higher education, research, and economic development that are accessible, culturally responsive, and place-based. American Indian higher education is holistic, focused on the mind, body, spirit, and family. Research is respectful of culture, mindful of community values, and essential to community well-being. Economic development strategies are based on national and international trends, but focused on relationships between local people and their land. In this environment, applied research flourishes and new knowledge, integrating traditional ways of knowing with western science, is created and used. In the 1990s, the American Indian Higher Education Consortium, which is composed of 35 Tribal Colleges and Universities in the U.S. and Canada, launched a major initiative to expand and enhance this capacity through new collaborations and state-of-the-art information and communications technologies. Through a multi-phase effort, the Tribal Colleges developed and are currently implementing a dynamic and broad-based strategic plan. The goal: to reach a "Circle of Prosperity," a place where tribal traditions and new technologies are woven together to build stronger and more sustainable communities through enhanced STEM education and research programs. Our plan, the "Tribal College Framework for Community Technology," is a framework of strategic partnerships, resources, and tools that is helping us create locally based economic and social opportunities through information and communications technology and use of the Internet. During this presentation, we will: (a) discuss the innovative collaborative process we are using to build
Institute of Scientific and Technical Information of China (English)
Hossain O. Yakhlef; Francisco Marcellán
2002-01-01
Given a positive definite matrix measure Ω supported on the unit circle T, then main purpose of this paper is to study the asymptotic behavior of Ln(Ω)Ln(Ω)-1 and Φn(z;Ω)Φn(z;Ω)-1 where Ω(z) = Ω(z) + zδ(z - w); |w| ＞ 1,M is a positive definite matrix and δ is the Dirac matrix measure. Here, Ln ( @ ) means the leading coefficient of the orthonormal matrix polynomials Φn(z; @ ).Finally, we deduce the asymptotic behavior of Φn (w;Ω)Φn (w;Ω) * in the case when M=I.
Ukwatta, T. N.; Linnemann, J. T.; Tollefson, K.; Abeysekara, A. U.; Bhat, P. N.; Sonbas, E.; Gehrels, N.
2011-01-01
We investigate the feasibility of implementing a system that will coordinate ground-based optical telescopes to cover the Fermi GBM Error Circle (EC). The aim of the system is to localize GBM detected GRBs and facilitate multi-wavelength follow-up from space and ground. This system will optimize the observing locations in the GBM EC based on individual telescope location, Field of View (FoV) and sensitivity. The proposed system will coordinate GBM EC scanning by professional as well as amateur astronomers around the world. The results of a Monte Carlo simulation to investigate the feasibility of the project are presented.
Ukwatta, T. N.; Linnemann, J. T.; Tollefson, K.; Abeysekara, A. U.; Bhat, P. N.; Sonbas, E.; Gehrels, N.
2011-01-01
We investigate the feasibility of implementing a system that will coordinate ground-based optical telescopes to cover the Fermi GBM Error Circle (EC). The aim of the system is to localize GBM detected GRBs and facilitate multi-wavelength follow-up from space and ground. This system will optimize the observing locations in the GBM EC based on individual telescope location, Field of View (FoV) and sensitivity. The proposed system will coordinate GBM EC scanning by professional as well as amateu...
International Nuclear Information System (INIS)
The paper describes a program system, written in Fortran, designed to control an automatic four-circle diffractometer for neutrons, either with or without an analyser. A simplified version can be used to control a powder diffractometer. This system, initially developed on the Telemecanique T2000 computer for three diffractometers at the Institut Laue-Langevin at Grenoble, has been rewritten for the Digital Equipment Corporation (DEC)PDP11 computer in such a way as to make the best possible use of the supervisor and the facilities available on this system. (Auth.)
DEFF Research Database (Denmark)
Morace, Renata Erica; Hansen, Hans Nørgaard; De Chiffre, Leonardo
2005-01-01
This paper deals with the uncertainty estimation of measurements performed on optical coordinate measuring machines (CMMs). Two different methods were used to assess the uncertainty of circle diameter measurements using an optical CMM: the sensitivity analysis developing an uncertainty budget and...... the substitution method based on measuring calibrated workpieces. Three holes with nominal diameter values in the range from 2 mm to 6 mm were measured on an optical CMM equipped with a CCD sensor and expanded measuring uncertainties were estimated to be in the range of 1-2 ìm....
VizieR Online Data Catalog: W1J00 and W2J00 Transit Circle Catalogs (Rafferty+, 2016)
Rafferty, T. J.; Holdenried, E. R.; Urban, S. E.
2016-06-01
The W1J00, named because it was the first (of two) Washington transit circle catalog to be referred to the Equinox of J2000.0, is the result of observations made with the Six-inch Transit Circle in Washington, D.C., between September 1977 and July 1982. The observing program was structured to be absolute, in the sense that the positions were not explicitly relying on any previous observations. The absolute positions were defined with respect to an internally consistent frame that was unique to the particular instrument. Following the reductions, comparisons with stars from the Hipparcos Catalogue (European Space Agency 1997) revealed unaccounted for systematic differences on the level of 100-200mas. It was decided, therefore, to include data on both the absolute positions reduced in way common to many past Washington transit circle catalogs, as well as the positions differentially adjusted to the system of the Hipparcos Catalog. The W1J00 contains mean positions of 7267 stars and 4383 observations of solar system objects. The majority of the stars fall into two categories; those from the Fifth Fundamental Catalog (FK5; Fricke et al 1988), and those from the Catalog Of 3539 Zodiacal Stars For The Equinox 1950.0 (Robertson 1940). The solar system objects include the Sun, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, eight minor planets (Eunomia, Flora, Hebe, Iris, Juno, Metis, Pallas, and Vesta), and the dwarf planet Ceres. Characteristics of the W1J00 catalog: Category Range Average ------------------------------------------------------------- Magnitudes -1.6 to 10.4 7.18 RA standard errors of the mean 15 to 460 mas 98 mas Dec standard errors of the mean 10 to 400 mas 107 mas RA Number of observations / star 3 to 187 10 Dec Number of observations / star 2 to 179 10 Declination coverage -39 to +90 degrees ------------------------------------------------------------- Details of the W1J00 can be found in Rafferty, Holdenried, and Urban (2016, Publ. USNO, 2nd
Bathymetric and Hydraulic Survey of the Matanuska River near Circle View Estates, Alaska
Conaway, Jeffrey S.
2008-01-01
An acoustic Doppler current profiler interfaced with a differentially corrected global positioning system was used to map bathymetry and multi-dimensional velocities on the Matanuska River near Circle View Estates, Alaska. Data were collected along four spur dikes and a bend in the river during a period of active bank erosion. These data were collected as part of a larger investigation into channel processes being conducted to aid land managers with development of a long-term management plan for land near the river. The banks and streambed are composed of readily erodible material and the braided channels frequently scour and migrate. Lateral channel migration has resulted in the periodic loss of properties and structures along the river for decades. For most of the survey, discharge of the Matanuska River was less than the 25th percentile of long-term streamflow. Despite this relatively low flow, measured water velocities were as high as 15 feet per second. The survey required a unique deployment of the acoustic Doppler current profiler in a tethered boat that was towed by a small inflatable raft. Data were collected along cross sections and longitudinal profiles. The bathymetric and velocity data document river conditions before the installation of an additional spur dike in 2006 and during a period of bank erosion. Data were collected along 1,700 feet of river in front of the spur dikes and along 1,500 feet of an eroding bank. Data collected at the nose of spur dikes 2, 3, and 4 were selected to quantify the flow hydraulics at the locations subject to the highest velocities. The measured velocities and flow depths were greatest at the nose of the downstream-most spur dike. The maximum point velocity at the spur dike nose was 13.3 feet per second and the maximum depth-averaged velocity was 11.6 feet per second. The maximum measured depth was 12.0 feet at the nose of spur dike 4 and velocities greater than 10 feet per second were measured to a depth of 10 feet
International Nuclear Information System (INIS)
To assess the usefulness of CT angiography(CTA) compared with conventional angiography(CA) in the evaluation of intracranial occlusive vascular disease. We evaluated 26 patients with clinically suspected intracranial occlusive vascular disease studied with both CTA and CA. In cases where there was no vascular lesion on CA, we used CTA to retrospectively review the detection rate and size of individual vessels, and compared the findings with those obtained by CA. In cases of occlusive vascular lesion, we evaluated the degree of stenosis on CTA and compared this with the CA findings. We also measured the time taken to use both modalities. Sixteen patients had no vascular lesion and ten patients had occlusive vascular lesions. Compared with CA, CTA detected 97%(124/128) of normal intracranial arteries ; their diameter measured on CTA was slightly smaller than that on CA. On CTA, the degree of stenosis was correctly estimated in eight lesions, underestimated in one and overestimated in one. Examination time ranged between 15 and 20 minutes with CTA and between 40 and 60 minutes with CA. Compared with CA, CTA shows good correlation in the delineation of intracranial normal and occlusive vessels around the Circle of Willis. CTA may be an additional tool for the evaluation of the Circle of Willis in patients with suspected intracranial occlusive vascular disease. CTA may, additionally, be used as a follow-up method in patients with acute cerebral infarctions after thrombolytic therapy
Navidad, Paolo Dominic; Li, Hao; Mankertz, Annette; Meehan, Brian
2008-09-01
Porcine circovirus type 2 (PCV2) infections in pigs have diverse clinical presentations and are considered economically important diseases worldwide. However, despite intensive research, the early pathogenesis of PCV2 and the primary target cells for PCV2 infections and replication are still unknown. Rolling-circle amplification (RCA) is an amplification technique for small, circular DNA templates that essentially mimics rolling-circle replication in vitro. In this study, the amplification of PCV2-specific DNAs using randomly primed RCA has been demonstrated. This novel approach has circumvented the normal requirement for conventional virus isolation procedures for the characterization of PCV2 DNAs from clinical samples. In addition, the potential utility of a strand-specific derivative of RCA was further investigated. Specifically, strand-specific RCA for the detection of active virus replication following the amplification of complementary sense PCV2 DNAs, which occur as double-stranded replicative intermediates that are present only during de novo viral DNA replication both in vitro and in vivo has been demonstrated. PMID:18606463
Hamidi, Seyed Vahid; Ghourchian, Hedayatollah
2015-10-15
A new colorimetric method for monitoring of rolling circle amplification was developed. At first H5N1 target hybrids with padlock probe (PLP) and then PLP is circularized upon the action of T4 ligase enzyme. Subsequently, the circular probe is served as a template for hyperbranched rolling circle amplification (HRCA) by utilizing Bst DNA polymerase enzyme. By improving the reaction, pyrophosphate is produced via DNA polymerization and chelates the Mg(2+) in the buffer solution. This causes change in solution color in the presence of hydroxy naphthol blue (HNB) as a metal indicator. By using pH shock instead of heat shock and isothermal RCA reaction not only the procedure becomes easier, but also application of HNB for colorimetric detection of RCA reaction further simplifies the assay. The responses of the biosensor toward H5N1 were linear in the concentration range from 0.16 to 1.20 pM with a detection limit of 28 fM. PMID:25974174
Circle Plus Partial Helical Scan Scheme for a Flat Panel Detector-Based Cone Beam Breast X-Ray CT
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Dong Yang
2009-01-01
Full Text Available Flat panel detector-based cone beam breast CT (CBBCT can provide 3D image of the scanned breast with 3D isotropic spatial resolution, overcoming the disadvantage of the structure superimposition associated with X-ray projection mammography. It is very difficult for Mammography to detect a small carcinoma (a few millimeters in size when the tumor is occult or in dense breast. CBBCT featured with circular scan might be the most desirable mode in breast imaging due to its simple geometrical configuration and potential applications in functional imaging. An inherited large cone angle in CBBCT, however, will yield artifacts in the reconstruction images when only a single circular scan is employed. These artifacts usually manifest themselves as density drop and object geometrical distortion that are more noticeable in the reconstructed image areas that are further away from the circular scanning plane. In order to combat this drawback, a circle plus partial helical scan scheme is proposed. An exact circle plus straight line scan scheme is also conducted in computer simulation for the purpose of comparison. Computer simulations using a numerical breast phantom demonstrated the practical feasibility of this new scheme and correction to those artifacts to a certain degree.
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Marco Antonio Stefani
2013-02-01
Full Text Available The present study evaluated the calibers and anatomic configurations based on the Magnetic Resonance analysis (MRA, assaying the cerebral vascular territories and sex-linked variations. A randomized sample of 30 angiographic examinations in adult patients of both sexes was obtained and components of the circle of Willis were identified. Branch diameters were measured on a transversal cut 5mm from the vessel origin in a typical angiographic frontal incidence. For the comparative statistical analysis, tests were divided in the groups considering the patients' sex and age. The classical Circle of Willis configuration was oberved in only 15 samples (50%. Greater calibers were observed in the arteries of the posterior circulation and multiple linear regression analysis established that the caliber of the posterior circulation was influenced by an independent variable related to the gender. Additional variations included unilateral and bilateral fetal and hypoplasic Posterior communicating arteries. In the anterior cerebral artery (ACA, the presence of an accessory developed ACA, an ACA giving branches to the distal portion of the two hemispheres and a third median ACA the variants were observed. Gender influenced the variations on internal diameters of posterior circulation vessels, with larger measurements in men.
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Penido, A. F. B.
2013-12-01
Full Text Available Aims: Characterization of cryptic plasmid pVCM01 (accession number JX133088 isolated from Salmonella enterica Enteritidis. Methodology and results: The complete sequence of pVCM01 was obtained. This plasmid possesses 1981 bp, with G+C content of 57% in agreement of the range of Salmonella genomic DNA. pVCM01 has a high degree of similarity to pB and pJ plasmids. It possesses six main open reading frames, only one have a very high degree of amino acid identity with protein involved in the rolling-circle-like replication (RCR. Based on the sequence similarities, pVCM01 plasmid belonged to the pC194/pUB110 rolling-circle replicating plasmid family. The Rep pVCM01 possesses the motifs: FLTLTVRN, HPHFHTL, SGDGYVKHERW, which were present in all Rep proteins. Conclusion, significance and impact of study: The small size of pVCM01 plasmid and its stability in E. coli cells, make it an attractive candidate to develop new vectors, such as cloning and/or expression vector.
A Personified Annealing Algorithm for Circles Packing Problem%求解圆形packing问题的拟人退火算法
Institute of Scientific and Technical Information of China (English)
张德富; 李新
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.
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Albert Westergren
2010-09-01
Full Text Available Background: Disease-related malnutrition is a major health problem in the elderly population and management issues are under-explored. Objectives: What is the prevalence of undernutrition-risk (UN-risk, underweight, and overweight in special accommodations (SAs? Do study circles and a nutritional care policy (NCP improve the precision in nutritional care (NC and decrease the prevalence of under- and overweight in a short- and/or long-term perspective?Design: Quasi-experimental pre- and post-intervention design with three experimental groups and one control group (CG. Setting: SAs. Participants: In 2005 (Time 1 – T1, 1726 (90.4% residents agreed to participate; in 2007 (Time 2 – T2, 1,526 (81.8%; and in 2009 (Time 3 – T3, 1,459 (81.3% residents participated. Interventions: Experimental groups: between T1 and T2 the first period of study circles was conducted in one municipality; between T2 and T3 a second period of study circles in another municipality was conducted; after T1 a NCP was implemented in one municipality. CG: residents in three municipalities. Measurements: Under- and overweight were defined based on BMI. Risk of undernutrition was defined as involving any of: involuntary weight loss, low BMI, and/or eating difficulties. The ‘precision in NC’ describes the relationship between nutritional treatment (protein- and energy-enriched food (PE-food and/or oral supplements and UN-risk. Results: The prevalence of UN-risk varied between 64 and 66%, underweight between 25 and 30%, and overweight between 30 and 33% in T1–T3. At T2 the prevalence of underweight was significantly lower in the first period study circle municipality, and at T3 in the second period study circle municipality compared to in the CG. The precision in NC was higher in a short-term perspective in the study circle municipalities and both in a short- and long-term perspective in the NCP municipality. At T3 between 54 and 70% of residents at UN-risk did not
Baltic Circle -festivaalin markkinointisuunnitelma kävijämäärän lisäämisen näkökulmasta
Pietilä, Vilma
2010-01-01
Opinnäytetyön tavoitteena oli toteuttaa markkinointisuunnitelma kansainväliselle Baltic Circle -teatterifestivaalille kävijämäärän lisäämisen näkökulmasta. Baltic Circle on marraskuussa vuosittain tapahtuva eurooppalaisen nykyteatterin uusimpia suuntauksia esittelevä festivaali. Se järjestetään seitsemättä kertaa syksyllä 2010, eikä festivaalille ole aiemmin tehty perusteellista markkinointisuunnitelmaa. Baltic Circlen markkinointia on haluttu kehittää ja kävijämäärää lisätä. Tähän tavoi...
Delvaux, Damien
2016-04-01
Paleostress inversion of geological fault-slip data is usually done using the directional part of the applied stress tensor on a slip plane and comparing it with the observed slip lines. However, this method do not fully exploit the brittle data sets as those are composed of shear and tension fractures, in addition to faults. Brittle deformation can be decomposed in two steps. An initial fracture/failure in previously intact rock generate extension/tensile fractures or shear fractures, both without visible opening or displacement. This first step may or not be followed by fracture opening to form tension joints, frictional shearing to form shear faults, or a combination of opening and shearing which produces hybrid fractures. Fractured rock outcrop contain information of the stress conditions that acted during both brittle deformation steps. The purpose here is to investigate how the fracture pattern generated during the initial fracture/failure step might be used in paleostress reconstruction. Each fracture is represented on the Mohr Circle by its resolved normal and shear stress magnitudes. We consider the typical domains on the Mohr circle where the different types de fractures nucleate (tension, hybrid, shear and compression fractures), as well the domain which contain reactivated fractures (faults reactivating an initial fracture plane). In function of the fracture type defined in the field, a "distance" is computed on the Mohr circle between each point and its expected corresponding nucleation/reactivation domain. This "Mohr Distance" is then used as function to minimize during the inversion. We implemented this new function in the Win-Tensor program, and tested it with natural and synthetic data sets from different stress regimes. It can be used alone using only the Mohr Distance on each plane (function F10), or combined with the angular misfit between observed striae and resolved shear directions (composite function F11). When used alone (F10), only the 3
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Nontando M. Hadebe
2016-07-01
Full Text Available Mercy Amba Oduyoye�s untitled poem about a circle sets the context for the renewal of the legacy of The Circle of Concerned African Women Theologians (The Circle at a time when The Circle seems to be moving in circles of uncertainty lacking a clear unified focus. Oduyoye describes a circle as eternal, expansive, evolving and sustained by self-critique, accountability, inclusiveness and connectedness to the reality around it. This continuous movement is expressed in the concept of Sankofa�Kairos which is rooted in the past and radically responsive to the present. This �backward�forward� theological method is critical for The Circle to remain true to its mission as a liberating theological and cultural voice for women and other oppressed groups. In contemporary contexts where oppression is pervasive and includes all groups, an inclusive gender paradigm as well as accountability to oppressed groups is critical for the renewal of The Circle. Trinitarian theology provides a model for liberating relationships characterised by equality, difference, mutuality, communion and oneness. Thus, it will be argued that Trinitarian theology provides theological resources for Sankofa�Kairos theologies for The Circle that will be inclusive and accountable to all oppressed groups. This will contribute to the restoration of The Circle as a critical contributor to liberation theologies in Africa.Intradisciplinary and/or interdisciplinary implications: This article proposes Sankofa�Kairos methodology based on the dual legacies of The Circle of Concerned African Women Theologians and The Kairos Document as the starting point for developing accountable and inclusive liberation theologies rooted in Social Models of the Trinity that could respond to the multiple challenges emerging from the African context.Keywords: Sankofa; Kairos; gender; African-women theologies; accountability;inclusivity; masculinities
Institute of Scientific and Technical Information of China (English)
汪峰; 张荣; 陈志忠; 吴小山; 顾书林; 沈波; 郑有堃; 蒋树声
2001-01-01
Crystal tilts in epitaxially laterally overgrown (ELO) GaN films via hydride vapour phase epitaxy (HVPE) onsapphire substrates have been investigated by using the four-circle x-ray diffraction method. Three diffractionpeaks corresponding to the (0002) reflection of vertically epitaxial and tilted GaN domains are observable in thex-ray rocking curve. The angle separations △ω between the main peak and two lobes change with the azimuthangle φ. The dependence of △ω on φ and the crystal tilt angle θ has been calculated based on the standardkinetic x-ray diffraction model. The crystal tilt angle of a typical HVPE ELO GaN sample has been determinedto be 2.379°.
Liu, Z H Peng Yu-xi; Tsai, J S
2011-01-01
We study a one-step approach to the fast generation of Greenberger-Horne-Zeilinger (GHZ) states in a circuit QED system with superconducting flux qubits. The GHZ state can be generated in about 10 ns, which is much shorter than the coherence time of flux qubits and comparable with the time of single-qubit operation. In our proposal, a time-dependent microwave field is applied to a superconducting transmission line resonator (TLR) and displaces the resonator in a controlled manner, thus inducing indirect qubit-qubit coupling without residual entanglement between the qubits and the resonator. The design of a tunably coupled TLR circle array provides us with the potential for extending this one-step scheme to the case of many qubits coupled via several TLRs.
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Regianne Leila Rolim Medeiros
2013-11-01
Full Text Available Organizational theory has long emphasized the importance of contingent, environmental influences on organizational performance. Similarly, research has demonstrated the importance of local political culture and informal management on the performance of the local health system, establishing vicious and virtuous circles of influence that contribute to increasing inequalities in performance among decentralized local health systems. A longitudinal ethnography studied the relationship between these elements in the same rural municipality in Northeast Brazil after a four-year interval. The second study found the local health system performance much improved. Two main factors appear to have interacted to bring this about: leadership vision and power to implement of one individual; professionalization of the local health system by hiring a significant number of senior health staff. The origins of these influences combine initiatives at local, state and federal levels.
Medeiros, Regianne Leila Rolim; Atkinson, Sarah
2013-11-01
Organizational theory has long emphasized the importance of contingent, environmental influences on organizational performance. Similarly, research has demonstrated the importance of local political culture and informal management on the performance of the local health system, establishing vicious and virtuous circles of influence that contribute to increasing inequalities in performance among decentralized local health systems. A longitudinal ethnography studied the relationship between these elements in the same rural municipality in Northeast Brazil after a four-year interval. The second study found the local health system performance much improved. Two main factors appear to have interacted to bring this about: leadership vision and power to implement of one individual; professionalization of the local health system by hiring a significant number of senior health staff. The origins of these influences combine initiatives at local, state and federal levels. PMID:24196907
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Benjamin Shikwati
2013-10-01
Full Text Available This article formulates a new integrated pastoral care approach to bereavement healing ministry in Africa, termed a circle for pastoral concern. In pursuit of this, the article highlights the pastoral challenge brought about by the occurrence of death and bereavement within the cultural and Christian intermix. Using the example of the Abaluyia of western Kenya, traditional cultural bereavement healing approaches are assessed against the backdrop of Christian influence on the understanding and response to death and bereavement healing and the resultant tension. The article juxtaposes the Abaluyia cultural concept of okhukura[to encircle with loving care] with the biblical koinōnia[fellowship, communion] as springboard for building culturally sensitive and biblically sound Christian caring communities. It is hoped that the juxtaposition helps to establish and promote meaningful engagement between therapeutic traditional beliefs and practices, and the gospel. The gospel-culture engagement within a local church setting provides the context in which bereavement healing and individual growth after the death of a significant other takes place. The juxtaposition is necessitated by the rampant practice in African pluralistic societies where Christians consciously, or otherwise, lurch back to cultural approaches in their effort to provide or find healing when faced with death and bereavement. The ‘circle for pastoral concern’ model encourages inclusiveness by enlisting the means and talents of the community of believers, both ordained and lay. The principle of inclusion ensures that the load of pastoral care is shared and assumes a deeper response due to diversity of gifts and talents within the caring community.
Energy Technology Data Exchange (ETDEWEB)
La Pointe, Paul R.; Hermanson, Jan
2002-09-09
The goal of this project is to improve the recovery of oil from the Circle Ridge Oilfield, located on the Wind River Reservation in Wyoming, through an innovative integration of matrix characterization, structural reconstruction, and the characterization of the fracturing in the reservoir through the use of discrete fracture network models.
BRON, S; HOLSAPPEL, S; VENEMA, G; PEETERS, BPH
1991-01-01
The effects of the rolling-circle mode of replication and the generation of single-stranded DNA (ss DNA) on plasmid deletion formation between short direct repeats in Bacillus subtilis were studied. Deletion units consisting of direct repeats (9, 18, or 27 bp) that do or do not flank inverted repeat
Application of quality control circles for improving drug turnover rate%"品管圈"活动在提高药品周转率中的应用
Institute of Scientific and Technical Information of China (English)
江红星; 严安定; 许杜娟
2013-01-01
Objective To study the effects and experience of quality control circles for the management of drug in pharmacy stores . Methods We set up a " quality control circle " organization, established drug management project, made analysis of the drug turnover rate,and developed appropriate corrective measures for implementing . Results Quality control circle effectively improved the drug turnover rate in pharmacy stores ,and enhanced the awareness of staff in pharmaceutical management and job satisfaction , promoted the staffs enthusiasm,creativity and initiative. Conclusion "Quality control circle" project is effective for improving the turnover rate of drugs .%目的 探索品管圈活动在药库药品管理中的效果与体会.方法 成立"品管圈"组织,确立药品管理项目,对药库药品周转率偏低进行原因分析,制订相应的整改措施并组织实施.结论 提高了药库药品周转率,增强了工作人员参与药品管理的意识和工作满足感,充分地发挥了工作人员的积极性、创造性、主动性.结论 "品管圈"活动在提高药品周转率中取得了较好的效果.
This work characterizes a recently discovered natural tetracycline-resistance plasmid called pMA67 from Paenibacillus larvae—a Gram-positive bacterial pathogen of honey bees. We provide evidence that pMA67 replicates by the rolling circle mechanism, and sequence comparisons place it in the pMV158 fa...
Quesne, C.
2001-01-01
A discrete completeness relation and a continuous one with a positive measure are found for the photon-added squeezed vacuum states. Extension to the photon-added squeezed one-photon states is considered. Photon-added coherent states on a circle are introduced. Their normalization and unity resolution relation are given.
Rafferty, T J; Urban, S E
2016-01-01
The astronomical results contained in this publication represent a continuation of previous work of the United States Naval Observatory Six-inch and Seven-inch transit circles. The results are also the last from United States Naval Observatory transit circles, since those instruments are no longer in service. For the W1J00, we present the results of observations made with the Six-inch Transit Circle in Washington, D.C., between September 1977 and July 1982. The catalog, called W1J00, contains mean positions of 7267 stars, all but five are north of -30 degrees declination, and 4383 observations of solar system objects. Positions of stars are for mean epoch of observation, on equator and equinox J2000.0. Positions of solar system objects are apparent places. Error estimates are about 100 mas per coordinate for the majority of stars. For the W2J00, we present the results of observations made with the Six-inch Transit Circle in Washington, D.C. and the Seven-inch Transit Circle at the Black Birch station near Ble...
Mortality due to a retained circle hook in a longfin mako shark Isurus paucus (Guitart-Manday).
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
Matano, Fumihiro; Murai, Yasuo; Adachi, Koji; Kitamura, Takayuki; Teramoto, Akira
2014-04-01
Cases of moyamoya disease or intracranial arterial stenosis around the circle of Willis (M/IAS) associated with hyperthyroidism have been reported. However, most of these previous reports were of the ischemic form of M/IAS and primary hyperthyroidism. To the best of our knowledge, no studies have documented therapy for M/IAS associated with hyperthyroidism. We discuss four previously unreported cases, including those involving the intracerebral hemorrhage form and thyroid-stimulating hormone (TSH) secretion from a pituitary adenoma (secondary hyperthyroidism). We analyzed data from 52 previously reported cases, including the 4 cases presented here, and discuss M/IAS associated with hyperthyroidism, treatment options, pathophysiology, the ischemic and hemorrhagic forms, secondary hyperthyroidism, and the relevant literature. Hyperthyroidism results in thyrotoxicosis and the stimulation of the superior cervical ganglion by TSH antibodies and f-T3/f-T4. Consequently, hypercoagulability and stenosis of the cerebral artery can occur. There are many reports of ischemic M/IAS associated with hyperthyroidism. A conservative approach to treatment is important in such cases; for example, antithyroid therapy should be the first choice to treat ischemic M/IAS. There have been only a limited number of reports on hemorrhagic M/IAS. We presume that hemorrhagic M/IAS tears the weakened vasculature in a manner similar to that of normal M/IAS (with no complicating hyperthyroidism). The authors also reported M/IAS associated with secondary hyperthyroidism due to pituitary thyroid secreting hormone secreting adenoma. PMID:24249431
Institute of Scientific and Technical Information of China (English)
Hao Zhiyong; Lin Baiquan; Gao Yabin; Cheng Yanying
2012-01-01
There are quite a few studies that have been done on borehole sealing theory both domestically and internationally.The existing researches usually consider drilling of the surroundings as a dense homogeneous elastic body which does not meet the characteristics of real drilling of the fractured body.Based on the loosing-circle theory and analyses of the surrounding rock stress field,cracks and seepage fields,combined with Newtonian fluid spherical grouting model,we deduced the dynamic relationship between the seepage coefficient and rock or grouting parameters of the drilling sealing fluid mode of spherical fissure grouting.In this experiment,mucus was injected in the simulated coal seam and the permeability coefficient of the sealing body was calculated by using the model.To verify the validity of the model,the calculated sealing body number was compared with the extreme negative pressure that the sealing body could withstand.The theoretical model revealed the drilling sealing fluid mechanism,provided a method for the quantitative calculation of the drilling sealing fluid effect by grouting mode and a reference for the subsequent research of sealing mechanism.
El Círculo Católico de Puebla, 1887-1900 Puebla's Catholic Circle, 1887-1900
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Sergio Francisco Rosas Salas
2012-06-01
Full Text Available Este artículo analiza la conformación y los primeros años del Círculo Católico de Puebla, una organización confesional formada por laicos por iniciativa clerical. Destaca la forma en que algunos católicos de la ciudad de Puebla actuaron bajo la política de conciliación del Porfiriato entre 1887 y 1900, y cómo la aprovecharon a su favor, pasando de la práctica pública del catolicismo al apostolado laico.This article analyzes the formation and the early years of Puebla's Catholic Circle, a confessional organization composed of secular persons on a clerical initiative. It draws attention to the actions of a number of Catholics in the city of Puebla under the Porfiriato's conciliation policy between 1887 and 1900, and the ways in which they used it to their advantage, shifting from the public practice of Catholicism to a lay ministry.
Translation as a virtuous circle: a case of borrowing in Arabic and re-borrowing in English
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Mohammad Ahmad Thawabteh
2014-07-01
Full Text Available Abstract – Translation has always been viewed as a virtuous circle throughout history. The present paper examines one of the oldest translation strategies, namely borrowing which also come to be employed by language users to fulfill communicative transaction in daily use of the language. The paper also explores re-borrowing as a translation method used by translators to render borrowed words usually integrated in a Source Language (SL text by SL author to relay his/her ideology via micro-/macro-signs. The data consists of selected examples from the translation of The Square Moon: Supernatural Tales (SMST by Ghada Samman. The writer employs borrowing to steer the SL readership towards her ideology. The findings of the paper show that re-borrowing may bring about optimal translation in the target language (TL, but reveal discrepancies between the SL and the TL caused by failure to render the ideology. Keywords: translation, borrowing, re-borrowing, English, Arabic.
Neimark, Matthew A; Konstas, Angelos-Aristeidis; Laine, Andrew F; Pile-Spellman, John
2007-11-01
A three-dimensional mathematical model was developed to examine the induction of selective brain cooling (SBC) in the human brain by intracarotid cold (2.8 degrees C) saline infusion (ICSI) at 30 ml/min. The Pennes bioheat equation was used to propagate brain temperature. The effect of cooled jugular venous return was investigated, along with the effect of the circle of Willis (CoW) on the intracerebral temperature distribution. The complete CoW, missing A1 variant (mA1), and fetal P1 variant (fP1) were simulated. ICSI induced moderate hypothermia (defined as 32-34 degrees C) in the internal carotid artery (ICA) territory within 5 min. Incorporation of the complete CoW resulted in a similar level of hypothermia in the ICA territory. In addition, the anterior communicating artery and ipsilateral posterior communicating artery distributed cool blood to the contralateral anterior and ipsilateral posterior territories, respectively, imparting mild hypothermia (35 and 35.5 degrees C respectively). The mA1 and fP1 variants allowed for sufficient cooling of the middle cerebral territory (30-32 degrees C). The simulations suggest that ICSI is feasible and may be the fastest method of inducing hypothermia. Moreover, the effect of convective heat transfer via the complete CoW and its variants underlies the important role of CoW anatomy in intracerebral temperature distributions during SBC. PMID:17761787
Wilson, Florence R; Ho, Angus; Walker, John R; Zhu, Xu-Dong
2016-07-01
TRF1, a duplex telomeric DNA binding protein, is implicated in homologous-recombination-based alternative lengthening of telomeres, known as ALT. However, how TRF1 promotes ALT activity has yet to be fully characterized. Here we report that Cdk-dependent TRF1 phosphorylation on T371 acts as a switch to create a pool of TRF1, referred to as (pT371)TRF1, which is recruited to ALT-associated PML bodies (APBs) in S and G2 phases independently of its binding to telomeric DNA. We find that phosphorylation of T371 is essential for APB formation and C-circle production, both of which are hallmarks of ALT. We show that the interaction of (pT371)TRF1 with APBs is dependent upon ATM and homologous-recombination-promoting factors Mre11 and BRCA1. In addition, (pT371)TRF1 interaction with APBs is sensitive to transcription inhibition, which also reduces DNA damage at telomeres. Furthermore, overexpression of RNaseH1 impairs (pT371)TRF1 recruitment to APBs in the presence of campothecin, an inhibitor that prevents topoisomerase I from resolving RNA-DNA hybrids. These results suggest that transcription-associated DNA damage, perhaps arising from processing RNA-DNA hybrids at telomeres, triggers (pT371)TRF1 recruitment to APBs to facilitate ALT activity. PMID:27185864
Theoretical and experimental analysis of AlGaInP micro-LED array with square-circle anode
International Nuclear Information System (INIS)
An array of 320 × 240 micro-light-emitting diodes (micro-LEDs) based on an AlGaInP epitaxial wafer and with a unit size of 100 µm×100 µm was designed and fabricated. The optimum width of the isolation groove between adjacent light-emitting units was determined based on a compromise between full isolation of each LED and maximization of the light emitting area, and was found to be 20 µm. The grooves were filled with a mixed Si granule-polyurethane composite medium, because this type of insulating material can reflect part of the emitted light from the sidewall to the window layer in each light-emitting unit, and could thus improve lighting output efficiency. The 10-µm-wide square-circle anode was designed to increase the light emitting area while simultaneously being simple to fabricate. The device current used was in the 0.42–1.06 mA range to guarantee internal quantum efficiency of more than 85%, with a corresponding voltage range of 2–2.3 V. The layered temperature distribution in a single unit was simulated under a drive voltage of 2.2 V, and the maximum device temperature was 341 K. The micro-opto-electro-mechanical systems (MOEMS) technology-based fabrication process, experimental images of the device and device test results are presented here
Theoretical and experimental analysis of AlGaInP micro-LED array with square-circle anode
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Chao Tian
2015-04-01
Full Text Available An array of 320 × 240 micro-light-emitting diodes (micro-LEDs based on an AlGaInP epitaxial wafer and with a unit size of 100 µm×100 µm was designed and fabricated. The optimum width of the isolation groove between adjacent light-emitting units was determined based on a compromise between full isolation of each LED and maximization of the light emitting area, and was found to be 20 µm. The grooves were filled with a mixed Si granule-polyurethane composite medium, because this type of insulating material can reflect part of the emitted light from the sidewall to the window layer in each light-emitting unit, and could thus improve lighting output efficiency. The 10-µm-wide square-circle anode was designed to increase the light emitting area while simultaneously being simple to fabricate. The device current used was in the 0.42–1.06 mA range to guarantee internal quantum efficiency of more than 85%, with a corresponding voltage range of 2–2.3 V. The layered temperature distribution in a single unit was simulated under a drive voltage of 2.2 V, and the maximum device temperature was 341 K. The micro-opto-electro-mechanical systems (MOEMS technology-based fabrication process, experimental images of the device and device test results are presented here.
Detection of UVA/UVC-induced damage of p53 fragment by rolling circle amplification with AIEgens.
Ou, Xiaowen; Wei, Benmei; Zhang, Zhenyu; Zhang, Mengshi; Zhuang, Yuan; Gao, Pengcheng; Lou, Xiaoding; Xia, Fan; Tang, Ben Zhong
2016-07-21
Absorption of ultraviolet (UV) light by nucleic acid could lead to mutations and skin cancers. Traditional damage detection methods based on fluorescence not only need dye/quencher groups but also display relatively high background interference, causing difficulty in synthesis and purification and thus low specificity of detection. Here, by combining rolling circle amplification (RCA) and aggregation-induced emission molecules (AIE), we made up for the defects of traditional methods to some extent and could also differentiate damaged and undamaged DNA. We also studied radiation damage of the p53 gene fragment both from UVA and UVC, although the mechanism of UVA in mutagenesis remains controversial. To amplify the signal-to-background ratio, we ligated the linear p53 (L p53) gene fragment to be a circular p53 (C p53) gene fragment, which is a key component for RCA. The combination of RCA products and positive TPE-Z (quaternized tetraphenylethene salt) molecules induced the aggregation of AIE molecules, and subsequently resulted in significant fluorescence enhancement (the signal for the undamaged DNA is 598% higher than that of the damaged). Compared with the traditional aggregation-caused quenching (ACQ) based fluorescent method, our assay was more sensitive and more specific. PMID:27194085
International Nuclear Information System (INIS)
We report on an electrochemical method for the determination of the activity of the enzyme methyltransferase (MTase). The methyl-binding domain-1 protein was applied to recognize symmetrically methylated cytosine in CpG (-C-phosphate-G-) islands of ds-DNA which then specifically bind to anti-His tag antibody. Hyperbranched rolling circle amplification (RCA) was used to improve sensitivity. When the dsDNA was treated with M.Sss I methyltransferase, the sequence 5′-CCGG-3′ was methylated and recognized by the methyl binding protein. In turn, the anti-His tag, biotinylated IgG, streptavidin and biotinylated oligonucleotide were captured successively on the surface of an electrode. Subsequently, the RCA reaction was initiated and streptavidin-labeled alkaline phosphatase immobilized on the surface of the electrode. ALP was able to catalyze the hydrolysis of 1-naphthyl phosphate to form 1-naphthol at pH 9.8. The oxidation peak current of 1-naphthol was used to monitor the methylation process. The response obtained by differential pulse voltammetry was linearly related to the concentration of M.Sss I MTase in the range from 0.1 to 40 unit mL−1, and the detection limit was 0.03 unit mL−1 (at an SNR of 3). The inhibitory action of paclitaxel on the activity of M.Sss I MTase also was investigated. (author)
Zhao, Guojie; Hu, Tianyu; Li, Jun; Wei, Hua; Shang, Hong; Guan, Yifu
2015-09-15
Rolling circle amplification (RCA) has been considered as a powerful tool for nucleic acids detection. Here, a novel repressor-RCA-based method for L-tryptophan (L-Trp) detection was developed. This method utilizes the specific interaction between the RCA circular template and the Trp repressor protein (TrpR) involved in trp operon of Escherichia coli (E. coli). In the absence of L-Trp, the TrpR protein could not bind to the RCA template, and the RCA process can be continued. When L-Trp is present, the activated TrpR will bind to the operon sequence on the RCA template and inhibit the RCA reaction. Thus, the concentration of L-Trp is correlated directly with the fluorescent RCA signals. We succeeded in detecting L-Trp in a single step in simple homogeneous reaction system. The detection limit was estimated to be 0.77 μM (S/N=3) with good linearity. The method can unambiguously distinguish L-Trp from other 19 standard amino acids and L-Trp analogs. This strategy is also promising for detecting many small molecules such as other amino acids and carbohydrates. PMID:25889351
Theoretical and experimental analysis of AlGaInP micro-LED array with square-circle anode
Tian, Chao; Wang, Weibiao; Liang, Jingqiu; Liang, Zhongzhu; Qin, Yuxin; Lv, Jinguang
2015-04-01
An array of 320 × 240 micro-light-emitting diodes (micro-LEDs) based on an AlGaInP epitaxial wafer and with a unit size of 100 µm×100 µm was designed and fabricated. The optimum width of the isolation groove between adjacent light-emitting units was determined based on a compromise between full isolation of each LED and maximization of the light emitting area, and was found to be 20 µm. The grooves were filled with a mixed Si granule-polyurethane composite medium, because this type of insulating material can reflect part of the emitted light from the sidewall to the window layer in each light-emitting unit, and could thus improve lighting output efficiency. The 10-µm-wide square-circle anode was designed to increase the light emitting area while simultaneously being simple to fabricate. The device current used was in the 0.42-1.06 mA range to guarantee internal quantum efficiency of more than 85%, with a corresponding voltage range of 2-2.3 V. The layered temperature distribution in a single unit was simulated under a drive voltage of 2.2 V, and the maximum device temperature was 341 K. The micro-opto-electro-mechanical systems (MOEMS) technology-based fabrication process, experimental images of the device and device test results are presented here.
Theoretical and experimental analysis of AlGaInP micro-LED array with square-circle anode
Energy Technology Data Exchange (ETDEWEB)
Tian, Chao [State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 130033 (China); University of Chinese Academy of Sciences, Beijing 100049 (China); Wang, Weibiao, E-mail: wangwbcn@163.com; Liang, Jingqiu, E-mail: liangjq@ciomp.ac.cn; Liang, Zhongzhu; Qin, Yuxin; Lv, Jinguang [State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 130033 (China)
2015-04-15
An array of 320 × 240 micro-light-emitting diodes (micro-LEDs) based on an AlGaInP epitaxial wafer and with a unit size of 100 µm×100 µm was designed and fabricated. The optimum width of the isolation groove between adjacent light-emitting units was determined based on a compromise between full isolation of each LED and maximization of the light emitting area, and was found to be 20 µm. The grooves were filled with a mixed Si granule-polyurethane composite medium, because this type of insulating material can reflect part of the emitted light from the sidewall to the window layer in each light-emitting unit, and could thus improve lighting output efficiency. The 10-µm-wide square-circle anode was designed to increase the light emitting area while simultaneously being simple to fabricate. The device current used was in the 0.42–1.06 mA range to guarantee internal quantum efficiency of more than 85%, with a corresponding voltage range of 2–2.3 V. The layered temperature distribution in a single unit was simulated under a drive voltage of 2.2 V, and the maximum device temperature was 341 K. The micro-opto-electro-mechanical systems (MOEMS) technology-based fabrication process, experimental images of the device and device test results are presented here.
Institute of Scientific and Technical Information of China (English)
WANG Shu-mei; LIU Jun-xin
2005-01-01
Compared to conventional oxidation ditches, an integrated oxidation ditch with vertical circle(IODVC) has the characters of concise configuration, simple operation and maintenance, land saving and automatical sludge returning. By the utilization of vertical circulation, an aerobic zone and an anoxic zone can be unaffectedly formed in the IODVC. Therefore, COD and nitrogen can be efficiently removed. However, the removal efficiency of phosphorus was Iow in the IODVC. In the experiment described, a laboratory scale system to add an anaerobic column to the IODVC has been tested to investigate the removal of phosphorus from wastewater. The experimental results showed that the removal efficiency of TP with the anaerobic column was increased to 54.0 % from 22.3 % without the anaerobic column. After the acetic sodium was added into the influent as carbon sources, the mean TP removal efficency of 77.5 % was obtained. At the same time, the mean removal efficiencies of COD, TN and NH3-N were 92.2%, 81.6% and 98.1%, respectively, at 12 h of HRT and 21-25 d of SRT. The optimal operational conditions in this study were as follows: recycle rate = 1.5-2.0, COD/TN > 6, COD/TP > 40,COD loading rate = 0.26-0.32 kgCOD/(kgSS·d), TN loading rate =0.028-0.034 kgTN/(kgSS·d) and TP loading rate = 0.003-0.005kgTP/(kgSS·d), respectively.
Yin, Tingting; Li, Hao; Zhang, Yuanyuan; Yang, Nana; Sun, Lizhou; Cao, Ya; Xiang, Yang
2016-05-01
Corin is an important member of type II transmembrane serine proteases that is involved in a variety of cardiovascular and pregnancy-related diseases. Herein, a sensitive and low-background electrochemical method is proposed to assay the activity of corin. In principle, a peptide comprising both the substrate motif of corin and binding site of cucurbit[8]uril (CB[8]) is first designed and immobilized on the electrode surface. Thereafter, via CB[8]-mediated supramolecular recognition, a DNA-primer is recruited, subsequently triggering the rolling circle amplification (RCA) reaction. In this way, a succeeding propagation of DNA strands is achieved on the electrode surface, which would produce remarkable repelling effect against the electrochemical species [Fe(CN)6](3-/4-), and thereby yield a highly minimized background signal. However, in the presence of activated corin, the peptide is specifically recognized and cleaved, breaching the recruitment of DNA primer as well as the RCA reaction, which decreases the repulsion to [Fe(CN)6](3-/4-), leading to a remarkable electrochemical response. As a result, the proposed assay method can sensitively determine the activity of corin with a detection limit of 0.92 pM, and can further be directly used in maternal plasma samples. Therefore, this method may provide a promising tool for pathological research and clinical diagnosis of corin-related diseases. PMID:27086096
Filtering of Airborne LiDAR Point Cloud Based on Variable Radius Circle and B-spline Fitting
Directory of Open Access Journals (Sweden)
ZHENG Jitao
2015-12-01
Full Text Available Filtering is the key to acquire digital terrain model from airborne LiDAR point cloud. In this paper, a new LiDAR point cloud filtering method is proposed. First, the scanning lines formed with point sequence are obtained throuth scanning the point cloud along the same direction. Then a circle with the variable radius rolling over the bottom of these scanning lines, the purpose is to acquire the points on the ground surface and delete the points on the objects at the same time. The next step is interval sampling from the scanning lines. On this basis, after fitting terrain surface with uniform B-spline surface, every point is projected to the fitting surface and calculate its height. According to compare the real height and its projection height to judge every point is on the terrain surface or not. The experiments show that filtering precision of the algorithm proposed in this paper is improved 1 to 5 times of the traditional methods, it can be used for the city, mountains and forest, and the time complexity of the algorithm is O(n.
DEFF Research Database (Denmark)
Kristoffersen, Emil Laust; Gonzales, Maria; Stougaard, Magnus;
2015-01-01
-modifying enzymes like type IB Topoisomerases and subsequently amplified by a rolling circle amplification (RCA) mechanism. The RCA process can be followed in real-time by the addition of a molecular beacon with a fluorophore/quencher pair. Upon hybridization to the amplified product, the fluorophore/quencher pair...... is separated, giving rise to a fluorescent signal, measurable in pseudo real-time using a qPCR machine or in a fluorimeter. The RCA products in complex with the molecular beacon can subsequently be moved to microscopic slides and analyzed in a fluorescence microscope. We describe the proof of the principle...... of this molecular beacon-based method combining the qPCR readout format with the standard Rolling circle Enhanced Enzymatic Assay previously reported. Although the qPCR setup is less sensitive, it allows easy, fast, and high-throughput measurement of enzyme activities. Human Topoisomerase IB (TopIB) is a well...
Huang, Jen-Fa; Nieh, Ta-Chun; Chen, Kai-Sheng
2013-01-01
The cyclic period and free spectral range of arrayed-waveguide gratings (AWG) in a wavelength-division multiplexing/optical code division multiple access optical code division multiple access network are exploited. The total optical network unit (ONU) of network capacity is partitioned into groups of different wavelength in accordance with the geographical location of subscribers based on the radial distance of the ONU to the optical line terminal. Combining concentric circles round by round for ONU groups enables a fixed round-trip time in the data transmission and a significant increase in system performance. Using AWG router, the proposed topology of concentric circles retains signature orthogonality and minimizes wavelength collisions on the photo-detector. Furthermore, the adoption of extended M-sequence codes corresponding to the AWG codec provides a simpler, more efficient coding procedure and accommodates more users in a single group.
Afsar, Ozgur; Tirnakli, Ugur
2010-10-01
We investigate the probability density of rescaled sum of iterates of sine-circle map within quasiperiodic route to chaos. When the dynamical system is strongly mixing (i.e., ergodic), standard central limit theorem (CLT) is expected to be valid, but at the edge of chaos where iterates have strong correlations, the standard CLT is not necessarily valid anymore. We discuss here the main characteristics of the probability densities for the sums of iterates of deterministic dynamical systems which exhibit quasiperiodic route to chaos. At the golden-mean onset of chaos for the sine-circle map, we numerically verify that the probability density appears to converge to a q -Gaussian with q<1 as the golden mean value is approached.
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
International Nuclear Information System (INIS)
In a recent analysis of Wilkinson Microwave Anisotropy Probe (WMAP) seven-year temperature maps, Gurzadyan and Penrose claim to find concentric circular patterns in the sky with anomalously low variances. These circles are presented as observational evidence for violent processes in a universe preceding our big bang as predicted by Penrose's Conformal Cyclic Cosmology. We reassess the statistical significance of the detection of the claimed concentric low-variance circles by comparing the WMAP data with Monte Carlo simulations of the cosmic microwave background (CMB) sky plus realistic modeling of WMAP's anisotropic noise. We find no anomaly in the variances compared with the ΛCDM cosmological model. The observed variances in the data are consistent with a Gaussian CMB sky as predicted by the inflationary cosmology model at better than 3σ.
Qarizada, Zabihullah
2015-01-01
Professional development (PD) of teachers is very important and plays a significant role in teachers’ development both in terms of his/her knowledge, skills, and motivation in today’s emerging world. In Afghanistan, the term Teacher Learning Circle (TLC) is used to refer to PD of teachers. TLC focuses on improving teachers’ pedagogical content knowledge and subject knowledge as well as creating a culture of sharing ideas, experiences and having collaboration among them. I present here the fin...
Directory of Open Access Journals (Sweden)
R. Henry Disney
2013-10-01
Full Text Available 64 species of Phoridae, in 6 genera, are reported from the Kola Peninsula, north of the Arctic Circle. The new species Megaselia elenae and M. kozlovi are described. 33 species of Megaselia, only known from females, are given code numbers. Keys to the species of all the females of Megaselia and Phora are provided; and also a key to the males European Megaselia species with a notopleural cleft.
Backert, S; Kunnimalaiyaan, M; Börner, T; Nielsen, B L
1998-12-11
According to the endosymbiotic theory, mitochondrial genomes evolved from the chromosome of an alpha-proteobacterium-like ancestor and developed during evolution an extraordinary variation in size, structure and replication. We studied in vitro DNA replication of the mitochondrial circular plasmid mp1 (1309 bp) from the higher plant Chenopodium album (L.) as a model system that replicates in a manner reminiscent of bacterial rolling circle plasmids. Several mp1 subclones were tested for their ability to support DNA replication using a newly developed in vitro system. Neutral/neutral two-dimensional gel electrophoresis of the in vitro products revealed typical simple Y patterns of intermediates consistent with a rolling circle type of replication. Replication activity was very high for a BamHI-restricted total plasmid DNA clone, a 464 bp BamHI/KpnI fragment and a 363 bp BamHI/SmaI fragment. Further subcloning of a 148 bp BamHI/EcoRI fragment resulted in the strongest in vitro DNA replication activity, while a 1161 bp-template outside of this region resulted in a substantial loss of activity. Electron microscopic studies of in vitro DNA replication products from the highly active clones also revealed sigma-shaped molecules. These results support our in vivo data for the presence of a predominant replication origin between positions 628 and 776 on the plasmid map. This sequence shares homology with double-stranded rolling circle origin (dso) or transfer origin (oriT) nicking motifs from bacterial plasmids. mp1 is the first described rolling circle plasmid in eukaryotes. PMID:9837722
Kong, Fanrong; Tong, Zhongsheng; Chen, Xiaoyou; Sorrell, Tania; Bin WANG; Wu, Qixuan; Ellis, David; Chen, Sharon
2008-01-01
DNA sequencing analyses have demonstrated relatively limited polymorphisms within the fungal internal transcribed spacer (ITS) regions among Trichophyton spp. We sequenced the ITS region (ITS1, 5.8S, and ITS2) for 42 dermatophytes belonging to seven species (Trichophyton rubrum, T. mentagrophytes, T. soudanense, T. tonsurans, Epidermophyton floccosum, Microsporum canis, and M. gypseum) and developed a novel padlock probe and rolling-circle amplification (RCA)-based method for identification o...
2015-01-01
Background: The high degree of phenotypic similarity among Trichophyton species makes their identification difficult. Objectives: The current study aims to establish the use of rolling circle amplification (RCA) based on internal transcribed spacer ribosomal DNA (ITS rDNA) as a powerful, simple, and rapid procedure for distinguishing closely related organisms, and specifically to identify Trichophyton species, which cause human and animal disorders. Materials and Methods: A total of sixty-one...
Puri, A.S.; Erdem, E.
2009-01-01
We describe a case of unusual Enterprise stent navigation through the Circle of Willis in a patient with a basilar tip aneurysm, left internal carotid artery (ICA) occlusion and previous right ICA stenting. Basilar tip aneurysms are known for their therapeutic challenges, especially when the posterior cerebral arteries (PCAs) are incorporated in the aneurysm neck. This becomes more technically demanding if the vertebral artery does not offer a route for stent navigation.
The Barriers and Countermeasures of the Talent Sharing of Wuhan City Circle%武汉城市圈人才共享的障碍及对策
Institute of Scientific and Technical Information of China (English)
朱平利
2011-01-01
The Wuhan city circle has a wealth of talent resources,preferential talent policies and favorable traffic environment,while some barriers have become an obstacle to talent sharing,including the census register system,file management,social security,human resources information system construction and others.Those barriers can be overcome in the following ways：（a） strengthen the Wuhan city circle talent market construction,（b）build shared talent information system within the city circle,（c）perfect the service functions of the talent resource market,（d）construct ＂talent zone＂ in Wuhan City circle,（e）create policy environment for talent sharing.%武汉城市圈人才共享有着丰富的人才资源基础、优惠的人才政策和良好的交通环境基础。在人才共享过程中出现户籍制度、档案管理、社会保障、人才信息系统建设等方面的障碍,可以从加强武汉城市圈人才市场的建设、建立城市圈内人才信息系统共享、完善人才资源市场的服务功能、做好武汉城市圈＂人才特区＂建设和创造人才共享的政策环境等方面来解决。
Mendis, Patrick
1995-01-01
The purpose of this paper is two-fold: the first part is to understand the "virtuous circles" of economic growth and human development; the second part is to review the development literature related to this discussion. For this, the evolving development strategies of Sri Lanka and South Korea and the seemingly convergent two schools of thinking are briefly outlined in Section II. Section III surveys the pace of economic and human progress to give a broad background of the debate. Section IV ...