Log in

Relevant bibliographies by topics / Invariantes ends / Journal articles

To see the other types of publications on this topic, follow the link: Invariantes ends.

Journal articles on the topic 'Invariantes ends'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Invariantes ends.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Kar, Aditi, та Graham A. Niblo. "Relative ends, ℓ2-invariants and property (T)". Journal of Algebra 333, № 1 (2011): 232–40. http://dx.doi.org/10.1016/j.jalgebra.2011.02.030.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

BRUHN, HENNING, and MAYA STEIN. "Duality of Ends." Combinatorics, Probability and Computing 19, no. 1 (2009): 47–60. http://dx.doi.org/10.1017/s0963548309990320.

Full text

Abstract:

We investigate the end spaces of infinite dual graphs. We show that there exists a natural homeomorphism * between the end spaces of a graph and its dual, and that * preserves the ‘end degree’. In particular, * maps thick ends to thick ends. Along the way, we prove that Tutte-connectivity is invariant under taking (infinite) duals.

APA, Harvard, Vancouver, ISO, and other styles

3

WȨGRZYN, P. "STRINGS WITH INTERACTING ENDS." Modern Physics Letters A 11, no. 27 (1996): 2223–32. http://dx.doi.org/10.1142/s0217732396002216.

Full text

Abstract:

At the classical level we study open bosonic strings. A generic description of string self-interactions localized at string ends is given. Self-interactions are characterized by two dimensionless coupling constants. The model is rewritten using complex Liouville fields. Using these Lorentz and reparametrization invariant variables, equations of motion get greatly simplified and reduce to some boundary problem for Liouville equation. Henceforth, the Nambu-Goto string model is proved to be still rnathematically tractable if we attach finite masses and interactions at string end points. With the

APA, Harvard, Vancouver, ISO, and other styles

4

Mrowka, Tomasz, Daniel Ruberman, and Nikolai Saveliev. "An index theorem for end-periodic operators." Compositio Mathematica 152, no. 2 (2015): 399–444. http://dx.doi.org/10.1112/s0010437x15007502.

Full text

Abstract:

We extend the Atiyah, Patodi, and Singer index theorem for first-order differential operators from the context of manifolds with cylindrical ends to manifolds with periodic ends. This theorem provides a natural complement to Taubes’ Fredholm theory for general end-periodic operators. Our index theorem is expressed in terms of a new periodic eta-invariant that equals the Atiyah–Patodi–Singer eta-invariant in the cylindrical setting. We apply this periodic eta-invariant to the study of moduli spaces of Riemannian metrics of positive scalar curvature.

APA, Harvard, Vancouver, ISO, and other styles

5

peschke, Georg. "Ends of spaces related by a covering map." Canadian Mathematical Bulletin 33, no. 1 (1990): 110–18. http://dx.doi.org/10.4153/cmb-1990-019-2.

Full text

Abstract:

Consider a covering p : X → B of connected topological spaces. If B is a compact polyhedron, a classical result of H. Hopf [4] says that the end space E(X) of X is an invariant of the group G of covering transformations. Thus it becomes meaningful to define the end space of the finitely generated group G as E(G) := E(X).

APA, Harvard, Vancouver, ISO, and other styles

6

Kubrusly, C. S. "Quasireducible operators." International Journal of Mathematics and Mathematical Sciences 2003, no. 31 (2003): 1993–2002. http://dx.doi.org/10.1155/s0161171203206165.

Full text

Abstract:

We introduce the concept ofquasireducibleoperators. Basic properties and illustrative examples are considered in some detail in order to situate the class of quasireducible operators in its due place. In particular, it is shown thatevery quasinormal operator is quasireducible. The following result links this class with the invariant subspace problem:essentially normal quasireducible operators have a nontrivial invariant subspace, which implies thatquasireducible hyponormal operators have a nontrivial invariant subspace.The paper ends with some open questions on the characterization of the clas

APA, Harvard, Vancouver, ISO, and other styles

7

LOZANO-ROJO, ÁLVARO. "An example of a non-uniquely ergodic lamination." Ergodic Theory and Dynamical Systems 31, no. 2 (2010): 449–57. http://dx.doi.org/10.1017/s0143385710000064.

Full text

Abstract:

AbstractThis paper presents an example of Riemann surface lamination with at least two ergodic invariant measures. The generic leaves for those measures are of different growth and have different numbers of ends.

APA, Harvard, Vancouver, ISO, and other styles

8

Saric, Branko. "Conditions for convergence of the fundamental matrix of linear time-invariant time-delayed singular systems." International Journal of Mathematics and Mathematical Sciences 31, no. 8 (2002): 463–75. http://dx.doi.org/10.1155/s016117120201178x.

Full text

Abstract:

In the introductory part of this paper the so-called generalBromwich-Wagner'stheorem has been generalized. Throughout the main part of the paper, an attempt has been made to derive conditions for convergence of the fundamental matrix of linear time-invariant time-delayed singular systems. The paper ends with a counterexample pointing out the fact that certain results of the theory of linear time-invariant singular systems are incorrect.

APA, Harvard, Vancouver, ISO, and other styles

9

BENJAMINI, ITAI, RUSSELL LYONS, and ODED SCHRAMM. "Unimodular random trees." Ergodic Theory and Dynamical Systems 35, no. 2 (2013): 359–73. http://dx.doi.org/10.1017/etds.2013.56.

Full text

Abstract:

AbstractWe consider unimodular random rooted trees (URTs) and invariant forests in Cayley graphs. We show that URTs of bounded degree are the same as the law of the component of the root in an invariant percolation on a regular tree. We use this to give a new proof that URTs are sofic, a result of Elek. We show that ends of invariant forests in the hyperbolic plane converge to ideal boundary points. We also note that uniform integrability of the degree distribution of a family of finite graphs implies tightness of that family for local convergence, also known as random weak convergence.

APA, Harvard, Vancouver, ISO, and other styles

10

Caraglio, Michele, Boris Marcone, Fulvio Baldovin, Enzo Orlandini, and Attilio L. Stella. "Topological Disentanglement of Linear Polymers under Tension." Polymers 12, no. 11 (2020): 2580. http://dx.doi.org/10.3390/polym12112580.

Full text

Abstract:

We develop a theoretical description of the topological disentanglement occurring when torus knots reach the ends of a semiflexible polymer under tension. These include decays into simpler knots and total unknotting. The minimal number of crossings and the minimal knot contour length are the topological invariants playing a key role in the model. The crossings behave as particles diffusing along the chain and the application of appropriate boundary conditions at the ends of the chain accounts for the knot disentanglement. Starting from the number of particles and their positions, suitable rule

APA, Harvard, Vancouver, ISO, and other styles

11

Lu, Hai Jun, Yu Xiang Lv, Wei Qing Ma, Xiao Long Zhao, and Xue Lian Zheng. "Windage Yaw Angle Detection of Suspension Insulator Strings Based on Edge Feature Matching." Applied Mechanics and Materials 241-244 (December 2012): 98–103. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.98.

Full text

Abstract:

By in-depth analysis and summary of tower suspension insulator strings images collected, a algorithm of edge feature matching of suspension insulator strings was proposed to detect the windage yaw angle in real-time. By filter, image grayscale, interframe difference and edge feature matching which based on invariance Generalized Hough Transform (IGHT) and local feature of suspension insulator strings stored in a database, the coordinates of the ends of suspension insulator strings were determined, and then the size of windage yaw angle of suspension insulator strings was calculated. The algori

APA, Harvard, Vancouver, ISO, and other styles

12

CYNOLTER, G. "WAVE FUNCTION OF THE RADION WITH BPS BRANES." Modern Physics Letters A 20, no. 07 (2005): 519–32. http://dx.doi.org/10.1142/s0217732305016725.

Full text

Abstract:

We investigate coupled gravity and a bulk scalar field on a slice of AdS 5 bulk with special BPS branes at the two ends. With a careful treatment of the general coordinate invariance, the complete tensor–scalar spectrum is presented. There are two massless zero modes in the scalar sector, the radion and a dilatonic zero mode. The four-dimensional effective action is of biscalar–tensor type.

APA, Harvard, Vancouver, ISO, and other styles

13

Morabito, Filippo, та M. Magdalena Rodríguez. "Saddle towers and minimal k-noids in ℍ2 × ℝ". Journal of the Institute of Mathematics of Jussieu 11, № 2 (2011): 333–49. http://dx.doi.org/10.1017/s1474748011000107.

Full text

Abstract:

AbstractGiven k ≥ 2, we construct a (2k − 2)-parameter family of properly embedded minimal surfaces in ℍ2 × ℝ invariant by a vertical translation T, called saddle towers, which have total intrinsic curvature 4π(1 − k), genus zero and 2k vertical Scherk-type ends in the quotient by T. Each of those examples is obtained from the conjugate graph of a Jenkins–Serrin graph over a convex polygonal domain with 2k edges of the same (finite) length. As limits of saddle towers, we obtain properly embedded minimal surfaces, called minimal k-noids, which are symmetric with respect to a horizontal slice (i

APA, Harvard, Vancouver, ISO, and other styles

14

Loya, Paul, Sergiu Moroianu та Jinsung Park. "Adiabatic limit of the eta invariant over cofinite quotients of PSL(2, ℝ)". Compositio Mathematica 144, № 6 (2008): 1593–616. http://dx.doi.org/10.1112/s0010437x0800362x.

Full text

Abstract:

AbstractThe eta invariant of the Dirac operator over a non-compact cofinite quotient of PSL(2,ℝ) is defined through a regularized trace following Melrose. It reduces to the standard definition in terms of eigenvalues in the case of a totally non-trivial spin structure. When the S1-fibers are rescaled, the metric becomes of non-exact fibered-cusp type near the ends. We completely describe the continuous spectrum of the Dirac operator with respect to the rescaled metric and its dependence on the spin structure, and show that the adiabatic limit of the eta invariant is essentially the volume of t

APA, Harvard, Vancouver, ISO, and other styles

15

Zaslavskii, O. B. "HIDDEN OBSERVER: ON ONE INVARIANT MOTIF IN PUSHKIN’S WORKS." Culture and Text, no. 43 (2020): 154–69. http://dx.doi.org/10.37386/2305-4077-2020-4-154-169.

Full text

Abstract:

It is shown that the same scene or situation passes through Pushkin’s works in which an observer watching for two or more objects is present. If an object of dangerous observation is a woman, the scene, as a rule, ends up with her faint or death. The presence of such an observer can be considered as uncontrolled intrusion of fate into human’s life. Uncovering the scheme under consideration is especially important since poetics of Pushkin is extremely laconic, so even in a finished text one is led to reconstruct some implicit details. Then, a given invariant (related just to the property of ret

APA, Harvard, Vancouver, ISO, and other styles

16

Peng, Yan, Mei Liu, Qing Jiu Huang, and Shao Rong Xie. "A Continuous Control for Stabilizing the Extended Nonholonomic Double Integrator." Key Engineering Materials 464 (January 2011): 217–20. http://dx.doi.org/10.4028/www.scientific.net/kem.464.217.

Full text

Abstract:

The extended nonholonomic double integrator (ENDI) cannot be asymptotically stabilized by a continuous and time-invariant feedback controller since it violates the Brockett’s condition. In this paper, a new continuous control scheme is proposed to stabilize the ENDI system without drift. The dynamics of an ENDI system is enlarged to a higher dimensional space where a continuous but time-varying control law is designed for its stabilization. Besides the theoretical proofs, simulations conducted on the dynamics of a mobile robot are also presented to demonstrate the validity and performance of t

APA, Harvard, Vancouver, ISO, and other styles

17

Peng, Yan, Mei Liu, Shao Rong Xie, and Jun Luo. "A Continuous Control for Stabilizing the Extended Nonholonomic Double Integrator: Theory and Simulation Results." Applied Mechanics and Materials 44-47 (December 2010): 3987–91. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.3987.

Full text

Abstract:

The extended nonholonomic double integrator (ENDI) cannot be asymptotically stabilized by a continuous and time-invariant feedback controller since it violates the Brockett’s condition. In this paper, a new continuous control scheme is proposed to stabilize the ENDI system without drift. The dynamics of an ENDI system is enlarged to a higher dimensional space where a continuous but time-varying control law is designed for its stabilization. Besides the theoretical proofs, simulations conducted on the dynamics of a mobile robot are also presented to demonstrate the validity and performance of t

APA, Harvard, Vancouver, ISO, and other styles

18

Tseytlin, Arkady A. "Comments on open string with ‘massive’ boundary term." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 476, no. 2236 (2020): 20190748. http://dx.doi.org/10.1098/rspa.2019.0748.

Full text

Abstract:

We discuss possible definition of open string path integral in the presence of additional boundary couplings corresponding to the presence of masses at the ends of the string. These couplings are not conformally invariant implying that as in a non-critical string case one is to integrate over the one-dimensional metric or reparametrizations of the boundary. We compute the partition function on the disc in the presence of an additional constant gauge field background and comment on the structure of the corresponding scattering amplitudes.

APA, Harvard, Vancouver, ISO, and other styles

19

Malacarne, Sara, and Sergey Neshveyev. "Martin boundaries of the duals of free unitary quantum groups." Compositio Mathematica 155, no. 6 (2019): 1171–93. http://dx.doi.org/10.1112/s0010437x19007322.

Full text

Abstract:

Given a free unitary quantum group $G=A_{u}(F)$, with $F$ not a unitary $2\times 2$ matrix, we show that the Martin boundary of the dual of $G$ with respect to any $G$-${\hat{G}}$-invariant, irreducible, finite-range quantum random walk coincides with the topological boundary defined by Vaes and Vander Vennet. This can be thought of as a quantum analogue of the fact that the Martin boundary of a free group coincides with the space of ends of its Cayley tree.

APA, Harvard, Vancouver, ISO, and other styles

20

Meusburger, Catherine, and Derek K. Wise. "Hopf algebra gauge theory on a ribbon graph." Reviews in Mathematical Physics 33, no. 05 (2021): 2150016. http://dx.doi.org/10.1142/s0129055x21500161.

Full text

Abstract:

We generalize gauge theory on a graph so that the gauge group becomes a finite-dimensional ribbon Hopf algebra, the graph becomes a ribbon graph, and gauge-theoretic concepts such as connections, gauge transformations and observables are replaced by linearized analogs. Starting from physical considerations, we derive an axiomatic definition of Hopf algebra gauge theory, including locality conditions under which the theory for a general ribbon graph can be assembled from local data in the neighborhood of each vertex. For a vertex neighborhood with [Formula: see text] incoming edge ends, the alg

APA, Harvard, Vancouver, ISO, and other styles

21

Rendall, Alan D. "Global properties of locally spatially homogeneous cosmological models with matter." Mathematical Proceedings of the Cambridge Philosophical Society 118, no. 3 (1995): 511–26. http://dx.doi.org/10.1017/s0305004100073837.

Full text

Abstract:

AbstractThe existence and nature of singularities in locally spatially homogeneous solutions of the Einstein equations coupled to various phenoraenological matter models is investigated. It is shown that, under certain reasonable assumptions on the matter, there are no singularities in an expanding phase of the evolution and that unless the spacetime is empty a contracting phase always ends in a singularity where at least one scalar invariant of the curvature diverges uniformly. The class of matter models treated includes perfect fluids, mixtures of non-interacting perfect fluids and collision

APA, Harvard, Vancouver, ISO, and other styles

22

Viola, Lorella. "On the diachrony of giusto? (‘right?’) in Italian." Journal of Historical Pragmatics 21, no. 1 (2020): 83–108. http://dx.doi.org/10.1075/jhp.00037.vio.

Full text

Abstract:

Abstract In Italian, the adjective giusto (‘right’) has performed the discourse function of response marker since at least 1613 (DELI 2008: 671). In this paper, I argue that the adjective has recently undertaken a new process of discoursivization, defined as the diachronic process that ends in discourse (Ocampo 2006: 317). In particular, I maintain that giusto may also serve the function of invariant tag (Andersen 2001), a linguistic item appended to a statement for the purpose of seeking mutual agreement, verification or corroboration of a claim (Millar and Brown 1979). Through diachronic lex

APA, Harvard, Vancouver, ISO, and other styles

23

Beck, Vinicius Carvalho, and João Alberto Da Silva. "Operative Invariants of Algebraic Pattern Present in the Strategies of Students of the 3rd Grade of Elementary School." Acta Scientiae 22, no. 3 (2020): 47–64. http://dx.doi.org/10.17648/acta.scientiae.5735.

Full text

Abstract:

Background: One of the great challenges for mathematics education in the 21st century is to alleviate the difficulties of students in the transition from arithmetic to algebra. There is already a consensus that there should not be a transition, as several experts have indicated algebraic approaches since the early years of schooling. Objectives: This study aims to describe and analyze the operative invariants of algebraic patterns present in the strategies of students of the 3rd grade of an elementary public school in the countryside of the state of Rio Grande do Sul. Design: The methodology u

APA, Harvard, Vancouver, ISO, and other styles

24

Willms, Jürgen. "Asymptotic behaviour of iterated piecewise monotone maps." Ergodic Theory and Dynamical Systems 8, no. 1 (1988): 111–31. http://dx.doi.org/10.1017/s0143385700004351.

Full text

Abstract:

AbstractIn this paper the asymptotic behaviour of piecewise monotone functions f: I → I with a finite number of discontinuities is studied (where I ⊆ ℝ is a compact interval). It is shown that there is a finite number of f-almost-invariant subsets C1,…, Cr, R1,…, Rs, where each Ci is a disjoint union of closed intervals and each Rj is a Cantor-like subset of I, such that if x is a ‘typical’ point in I (in a topological sense) then exactly one of the following three possibilities will happen:(1) {fn (x)}n ≥ 0 eventually ends up in some Ci.(2) {fn (x)}n ≥ 0 is attracted to some Rj.(3) {fn (x): n

APA, Harvard, Vancouver, ISO, and other styles

25

Alvarez, Carlos A., Prema Narayan, Jianing Huang, and David Puett. "Characterization of a Region of the Lutropin Receptor Extracellular Domain Near Transmembrane Helix 1 That Is Important in Ligand-Mediated Signaling*." Endocrinology 140, no. 4 (1999): 1775–82. http://dx.doi.org/10.1210/endo.140.4.6624.

Full text

Abstract:

Abstract The lutropin receptor (LHR), a member of the G protein-coupled receptor family, contains a relatively large N-terminal extracellular domain, accounting for about half of the receptor and responsible for high affinity ligand binding, and a standard heptahelical portion with connecting loops and a C-terminal tail. LHR and the other two glycoprotein hormone receptors, i.e. the follitropin and TSH receptors, contain an invariant 10-amino acid residue sequence, FNPCEDIMGY (residues 328–337 in rat LHR), in the extracellular domain separated by only a few amino acid residues from the beginni

APA, Harvard, Vancouver, ISO, and other styles

26

Henrici, Andreas. "Nekhoroshev Stability for the Dirichlet Toda Lattice." Symmetry 10, no. 10 (2018): 506. http://dx.doi.org/10.3390/sym10100506.

Full text

Abstract:

In this work, we prove a Nekhoroshev-type stability theorem for the Toda lattice with Dirichlet boundary conditions, i.e., with fixed ends. The Toda lattice is a member of the family of Fermi-Pasta-Ulam (FPU) chains, and in view of the unexpected recurrence phenomena numerically observed in these chains, it has been a long-standing research aim to apply the theory of perturbed integrable systems to these chains, in particular to the Toda lattice which has been shown to be a completely integrable system. The Dirichlet Toda lattice can be treated mathematically by using symmetries of the periodi

APA, Harvard, Vancouver, ISO, and other styles

27

BANAKH, TARAS. "INTERPLAY BETWEEN THE ALGEBRAIC STRUCTURE OF A GROUP AND ARITHMETIC PROPERTIES OF ITS SPECTRUM." International Journal of Algebra and Computation 14, no. 01 (2004): 1–34. http://dx.doi.org/10.1142/s0218196704001645.

Full text

Abstract:

We investigate the interplay between the algebraic structure of a group G and arithmetic properties of its spectrum σ(G) which consists of the eigenvalues of all the inner automorphisms of G. A complex number λ is called an eigenvalue of a group automorphism A:G→G if φ◦A|H=λ·φ for some non-trivial homomorphism [Formula: see text] defined on an A-invariant subgroup H⊂G. It is shown that many properties of a group G (such as the presence of a finitely generated subgroup of infinite rank, nilpotence, periodicity, polycyclicity, etc.) are coded in its spectrum. In this paper the spectra are applie

APA, Harvard, Vancouver, ISO, and other styles

28

Intrieri, Robert, and Paige Goodwin. "The Life Orientation Test: A Confirmatory Factor Analysis Across Three Age Groups." Innovation in Aging 4, Supplement_1 (2020): 459. http://dx.doi.org/10.1093/geroni/igaa057.1486.

Full text

Abstract:

Abstract The Life Orientation Test (LOT; Scheier & Carver, 1985) was developed as a measure of dispositional optimism. Optimism has been linked to positive life outcomes and is associated with psychological (Carver & Gaines, 1987; Scheier & Carver, 1985) and physical (Scheier & Carver, 1987; Scheier et al. 1989) well-being. The current study assessed 520 people placed into three age groups: young adult (n =149), middle-age adult (n = 252), and older adult (n = 119). The mean age for the young group was 19.24 (SD = 2.01), middle-aged (47.68 (SD = 4.75), and old was 71.99 (SD = 7

APA, Harvard, Vancouver, ISO, and other styles

29

FEUDEL, FRED, ULRIKE FEUDEL, and AXEL BRANDENBURG. "ON THE BIFURCATION PHENOMENA OF THE KURAMOTO–SIVASHINSKY EQUATION." International Journal of Bifurcation and Chaos 03, no. 05 (1993): 1299–303. http://dx.doi.org/10.1142/s0218127493001045.

Full text

Abstract:

Bifurcation phenomena of the Kuramoto–Sivashinsky equation have been studied numerically. The solutions considered are restricted to the invariant subspace of odd functions. One possible route to chaos via a period-doubling cascade is investigated in detail: The four-modal steady-state loses its stability through a Hopf bifurcation and a branch of periodic motions is created. After a symmetry breaking the periodic solution undergoes a period-doubling cascade which ends up in two antisymmetric chaotic attractors. A merging of these antisymmetric attractors to a symmetric one is observed. The ch

APA, Harvard, Vancouver, ISO, and other styles

30

Saric, Branko. "On the finite Fourier transforms of functions with infinite discontinuities." International Journal of Mathematics and Mathematical Sciences 30, no. 5 (2002): 301–17. http://dx.doi.org/10.1155/s0161171202012619.

Full text

Abstract:

The introductory part of the paper is provided to give a brief review of the stability theory of a matrix pencil for discrete linear time-invariant singular control systems, based on the causal relationship between Jordan's theorem from the theory of Fourier series and Laurent's theorem from the calculus of residues. The main part is concerned with the theory of the integral transforms, which has proved to be a powerful tool in the control systems theory. On the basis of a newly defined notion of the total value of improper integrals, throughout the main part of the paper, an attempt has been

APA, Harvard, Vancouver, ISO, and other styles

31

Grove, Philip M., Jessica M. Byrne, and Barbara J. Gillam. "How Configurations of Binocular Disparity Determine Whether Stereoscopic Slant or Stereoscopic Occlusion is Seen." Perception 34, no. 9 (2005): 1083–94. http://dx.doi.org/10.1068/p5274.

Full text

Abstract:

A partially occluded contour and a slanted contour may generate identical binocular horizontal disparities. We investigated conditions promoting an occlusion resolution indicated by an illusory contour in depth along the aligned ends of horizontally disparate line sets. For a set of identical oblique lines with a constant width added to one eye's view, strength, depth, and stability of the illusory contour were poor, whereas for oblique lines of alternating orientations the illusory contours were strong, indicating a reliance on vertical size disparities rather than vertical positional dispari

APA, Harvard, Vancouver, ISO, and other styles

32

FINUCANE, HILARY. "FINITE VORONOI DECOMPOSITIONS OF INFINITE VERTEX TRANSITIVE GRAPHS." Journal of Topology and Analysis 05, no. 02 (2013): 239–50. http://dx.doi.org/10.1142/s1793525313500088.

Full text

Abstract:

In this paper, we consider the Voronoi decompositions of an arbitrary infinite vertex-transitive graph G. In particular, we are interested in the following question: what is the largest number of Voronoi cells that must be infinite, given sufficiently (but finitely) many Voronoi sites which are sufficiently far from each other? We call this number the survival number s(G). The survival number of a graph has an alternative characterization in terms of the number of balls of radius r-1 required to cover a sphere of radius r. The survival number is not a quasi-isometry invariant, but it remains o

APA, Harvard, Vancouver, ISO, and other styles

33

Havsteen, B. H. "General method for exact evaluation of parameters of the elementary steps of coupled reactions. Invariant analysis." Biochemical Journal 232, no. 3 (1985): 791–97. http://dx.doi.org/10.1042/bj2320791.

Full text

Abstract:

A general method has been devised for the exact evaluation of the rate constants of the elementary steps of a system consisting of any number of coupled reactions. The method is independent of the structure of the network of coupled steps. The precision of the data evaluation is solely dependent on the quality of the detection unit. The application of the method is illustrated with data collected for the binding of the competitive inhibitor proflavine to chymotrypsin under such conditions that five states of the enzyme are required to interpret the results. In the absence of a substance posses

APA, Harvard, Vancouver, ISO, and other styles

34

Kiesselbach, Matthias. "Hobbes's Struggle with Contractual Obligation. On the Status of the Laws of Nature in Hobbes's Work." Hobbes Studies 23, no. 2 (2010): 105–23. http://dx.doi.org/10.1163/187502510x531633.

Full text

Abstract:

AbstractThis paper argues that throughout his intellectual career, Hobbes remains unsatisfied with his own attempts at proving the invariant advisability of contract-keeping. Not only does he see himself forced to abandon his early idea that contractual obligation is a matter of physical laws. He also develops and retains doubts concerning its theoretical successor, the doctrine that the obligatoriness characteristic of contracts is the interest in self-preservation in alliance with instrumental reason – i.e. prudence. In fact, it is during his work on Leviathan that Hobbes notes the doctrine'

APA, Harvard, Vancouver, ISO, and other styles

35

Camassa, R., S. Chen, G. Falqui, G. Ortenzi, and M. Pedroni. "An inertia ‘paradox’ for incompressible stratified Euler fluids." Journal of Fluid Mechanics 695 (February 16, 2012): 330–40. http://dx.doi.org/10.1017/jfm.2012.23.

Full text

Abstract:

AbstractThe interplay between incompressibility and stratification can lead to non-conservation of horizontal momentum in the dynamics of a stably stratified incompressible Euler fluid filling an infinite horizontal channel between rigid upper and lower plates. Lack of conservation occurs even though in this configuration only vertical external forces act on the system. This apparent paradox was seemingly first noticed by Benjamin (J. Fluid Mech., vol. 165, 1986, pp. 445–474) in his classification of the invariants by symmetry groups with the Hamiltonian structure of the Euler equations in two

APA, Harvard, Vancouver, ISO, and other styles

36

AL-Darkazali, Hind, Vithaya Meevootisom, Duangnate Isarangkul, and Suthep Wiyakrutta. "Gene Expression and Molecular Characterization of a Xylanase from Chicken Cecum Metagenome." International Journal of Microbiology 2017 (2017): 1–12. http://dx.doi.org/10.1155/2017/4018398.

Full text

Abstract:

A xylanase genexynAMG1with a 1,116-bp open reading frame, encoding an endo-β-1,4-xylanase, was cloned from a chicken cecum metagenome. The translatedXynAMG1protein consisted of 372 amino acids including a putative signal peptide of 23 amino acids. The calculated molecular mass of the matureXynAMG1was 40,013 Da, with a theoretical pI value of 5.76. The amino acid sequence ofXynAMG1showed 59% identity to endo-β-1,4-xylanase fromPrevotella bryantiiandPrevotella ruminicolaand 58% identity to that fromPrevotella copri.XynAMG1has two conserved motifs, DVVNE and TEXD, containing two active site gluta

APA, Harvard, Vancouver, ISO, and other styles

37

Angelova, Krassimira, and David Puett. "Differential Responses of an Invariant Region in the Ectodomain of Three Glycoprotein Hormone Receptors to Mutagenesis and Assay Conditions." Endocrine 19, no. 2 (2002): 147–54. http://dx.doi.org/10.1385/endo:19:2:147.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Mullick, L., and P. Bandyopadhyay. "Fermions, q-deformed diffeomorphism and the evolution of spin networks." International Journal of Modern Physics D 24, no. 10 (2015): 1550074. http://dx.doi.org/10.1142/s0218271815500741.

Full text

Abstract:

We have considered here the emergence of diffeomorphism symmetry in quantum gravity in the framework of the quantization of a fermion. It is pointed out that a closed loop having the holonomy associated with the SU(2) gauge group is realized from the rotation of the direction vector associated with the quantization of a fermion depicting spin degrees of freedom which appear as SU(2) gauge bundle. During the formation of a loop, a noncyclic path with open ends can be mapped onto a closed loop when the holonomy involves q-deformed gauge group SUq(2). This gives rise to q-deformed diffeomorphism

APA, Harvard, Vancouver, ISO, and other styles

39

Reis, A. Heitor. "Constructal Theory: From Engineering to Physics, and How Flow Systems Develop Shape and Structure." Applied Mechanics Reviews 59, no. 5 (2006): 269–82. http://dx.doi.org/10.1115/1.2204075.

Full text

Abstract:

Constructal theory and its applications to various fields ranging from engineering to natural living and inanimate systems, and to social organization and economics, are reviewed in this paper. The constructal law states that if a system has freedom to morph it develops in time the flow architecture that provides easier access to the currents that flow through it. It is shown how constructal theory provides a unifying picture for the development of flow architectures in systems with internal flows (e.g., mass, heat, electricity, goods, and people). Early and recent works on constructal theory

APA, Harvard, Vancouver, ISO, and other styles

40

Wu, L.-I., and W.-T. Chang. "Analysis of mechanical errors in disc cam mechanisms." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 219, no. 2 (2005): 209–24. http://dx.doi.org/10.1243/095440605x8405.

Full text

Abstract:

This paper presents an analytical method for analysing the mechanical errors of disc cam mechanisms. With the aid of parametric expressions of the cam profile and by employing the concept of equivalent linkage, the error of the follower motion that is due to the variation in each design parameter can be determined analytically. The resulting error equations do not really involve the location of the curvature centre of the cam profile, and thus locating the curvature centre of the cam profile is not essential. The method is validated through analysing a cam mechanism that has an invariant equiv

APA, Harvard, Vancouver, ISO, and other styles

41

Agustín-Hernández, L., R. Argiolas, V. Bagnolo, and M. Sancho Mir. "FROM TLS POINT CLOUD DATA TO GEOMETRICAL GENESIS DETERMINATION OF RIBBED MASONRY VAULTS." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLVI-M-1-2021 (August 28, 2021): 9–16. http://dx.doi.org/10.5194/isprs-archives-xlvi-m-1-2021-9-2021.

Full text

Abstract:

Abstract. The contribution aims to explore the possibility of tracing the geometry of ribbed vaults from two different Mediterranean regions to a single matrix, verifying the presence of possible local variations of the same rules. In particular, the analyses are being carried out in parallel on some case studies of the regions of Sardinia in Italy and Aragon in Spain. The two case studies include the Iglesia Parroquial del Salvador la Seo in Zaragoza and the Church of Santa Lucia in Cagliari. Both constructions can be traced back to the style known as Late Mediterranean Gothic, which characte

APA, Harvard, Vancouver, ISO, and other styles

42

Shimizu, Sota, and Joel W. Burdick. "Eccentricity Estimator for Wide-Angle Fovea Vision Sensor." Journal of Robotics and Mechatronics 21, no. 1 (2009): 128–34. http://dx.doi.org/10.20965/jrm.2009.p0128.

Full text

Abstract:

This paper proposes a method for estimating the eccentricity that corresponds to the incident angle to a fovea sensor. The proposed method uses the Fourier-Mellin Invariant descriptor to estimate rotation, scale, and translation, by taking both geometrical distortion and non-uniform resolution of a space-variant image from the fovea sensor into account. The following 2 points are focused on in this paper. One is to use multi-resolution images by Discrete Wavelet Transform to properly reduce noise caused by foveation. Another is to use a variable window function (although the window function is

APA, Harvard, Vancouver, ISO, and other styles

43

Luse, Donal S., Mrutyunjaya Parida, Benjamin M. Spector, Kyle A. Nilson, and David H. Price. "A unified view of the sequence and functional organization of the human RNA polymerase II promoter." Nucleic Acids Research 48, no. 14 (2020): 7767–85. http://dx.doi.org/10.1093/nar/gkaa531.

Full text

Abstract:

Abstract To better understand human RNA polymerase II (Pol II) promoters in the context of promoter-proximal pausing and local chromatin organization, 5′ and 3′ ends of nascent capped transcripts and the locations of nearby nucleosomes were accurately identified through sequencing at exceptional depth. High-quality visualization tools revealed a preferred sequence that defines over 177 000 core promoters with strengths varying by &gt;10 000-fold. This sequence signature encompasses and better defines the binding site for TFIID and is surprisingly invariant over a wide range of promoter str

APA, Harvard, Vancouver, ISO, and other styles

44

Huseynov, T. K., T. T. Gadirova, B. K. Amiraslanov, N. A. Abdulova, A. I. Quliyeva, and K. R. Haciyeva. "Theoretical and experimental study of vibration-amplitude liquid densimeter on the basis of a high-quality tubular resonator." E3S Web of Conferences 124 (2019): 03004. http://dx.doi.org/10.1051/e3sconf/201912403004.

Full text

Abstract:

This paper is devoted to the current model of vibration-amplitude liquid densimeter developed by the authors. Firstly, the necessity to develop vibration-amplitude liquids densimeters with straigt-flow sensing elements (resonators) belonging to the “low cost low accuracy” category is justified. The resonator structure, developed as the result of the search using the heuristic method, is described. The proposed resonator is a tube rigidly fixed at the ends with additional weights attached symmetrically at the vertical axis at the points of the antinodes of the second fundamental oscillation mod

APA, Harvard, Vancouver, ISO, and other styles

45

Pan, Qingtian, Miao Chen, Baoqi Zuo, and Yucai Hu. "The Inspection of Raw- Silk Defects Using Image Vision." Journal of Engineered Fibers and Fabrics 13, no. 3 (2018): 155892501801300. http://dx.doi.org/10.1177/155892501801300309.

Full text

Abstract:

The inspection of defects is one of the most important aspects in the quality inspection of raw silk. We introduce a raw-silk defect detection system based on image vision and image analysis that is accurate and objective. In the experimental phase, we develop an image-acquisition section—which includes a charge-coupled device (CCD) image sensor, a telecentric lens, a light source, and a raw-silk winding device to capture the raw silk images steadily. After the image capture stage, an image-processing section tasked with threshold segmentation and morphology operations is carried out to obtain

APA, Harvard, Vancouver, ISO, and other styles

46

Arya, Kriti, and Somnath Sarangi. "Effect of damage on the free radial oscillations of an incompressible isotropic tube." Mathematics and Mechanics of Solids 23, no. 8 (2017): 1177–205. http://dx.doi.org/10.1177/1081286517712076.

Full text

Abstract:

The effect of damage on the finite-amplitude, free radial oscillations of an arbitrary incompressible, isotropic, homogeneous cylindrical tube is investigated. Pressure is applied to the inner and outer surfaces of the damaged cylinder and constrained from both ends. A purely radial motion is observed when the pressure is removed. The corresponding equation of motion is obtained, incorporating the effect of damage. A simple exponential front factor damage function is introduced in the tube problem. The damage function is a function of the first invariant of the left Cauchy–Green deformation te

APA, Harvard, Vancouver, ISO, and other styles

47

Prangishvili, David, Hans Peter Arnold, Dorothee Götz, et al. "A Novel Virus Family, the Rudiviridae: Structure, Virus-Host Interactions and Genome Variability of the Sulfolobus Viruses SIRV1 and SIRV2." Genetics 152, no. 4 (1999): 1387–96. http://dx.doi.org/10.1093/genetics/152.4.1387.

Full text

Abstract:

Abstract The unenveloped, stiff-rod-shaped, linear double-stranded DNA viruses SIRV1 and SIRV2 from Icelandic Sulfolobus isolates form a novel virus family, the Rudiviridae. The sizes of the genomes are 32.3 kbp for SIRV1 and 35.8 kbp for SIRV2. The virions consist of a tube-like superhelix formed by the DNA and a single basic 15.8-kD DNA-binding protein. The tube carries a plug and three tail fibers at each end. One turn of the DNA-protein superhelix measures 4.3 nm and comprises 16.5 turns of B DNA. The linear DNA molecules appear to have covalently closed hairpin ends. The viruses are not l

APA, Harvard, Vancouver, ISO, and other styles

48

Banaru, M. "On six-dimensional Vaisman — Gray submanifolds of the octave algebra." Differential Geometry of Manifolds of Figures, no. 50 (2019): 29–35. http://dx.doi.org/10.5922/10.5922/0321-4796-2019-50-4.

Full text

Abstract:

The W1 W4 class of almost Hermitian manifolds (in accordance with the Gray — Hervella classification) is usually named as the class of Vaisman — Gray manifolds. This class contains all Kählerian, nearly Kählerian and locally conformal Kählerian manifolds. As it is known, Vaisman — Gray manifolds are invariant under the conformal transformations of the metric. A criterion in the terms of the configuration tensor for an arbitrary six-dimensional submanifold of Cayley algebra to belong to the Vaisman — Gray class of almost Hermitian manifolds is established. The Cartan structural equations of th

APA, Harvard, Vancouver, ISO, and other styles

49

Dardano, Ulderico, Dikran Dikranjan, and Luigi Salce. "On uniformly fully inert subgroups of abelian groups." Topological Algebra and its Applications 8, no. 1 (2020): 5–27. http://dx.doi.org/10.1515/taa-2020-0002.

Full text

Abstract:

AbstractIf H is a subgroup of an abelian group G and φ ∈ End(G), H is called φ-inert (and φ is H-inertial) if φ(H) ∩ H has finite index in the image φ(H). The notion of φ-inert subgroup arose and was investigated in a relevant way in the study of the so called intrinsic entropy of an endomorphism φ, while inertial endo-morphisms (these are endomorphisms that are H-inertial for every subgroup H) were intensively studied by Rinauro and the first named author.A subgroup H of an abelian group G is said to be fully inert if it is φ-inert for every φ ∈ End(G). This property, inspired by the “dual” n

APA, Harvard, Vancouver, ISO, and other styles

50

Lo Presti, Leonardo, Raffaella Soave, Mariangela Longhi, and Emanuele Ortoleva. "Conformational polymorphism in a Schiff-base macrocyclic organic ligand: an experimental and theoretical study." Acta Crystallographica Section B Structural Science 66, no. 5 (2010): 527–43. http://dx.doi.org/10.1107/s0108768110029514.

Full text

Abstract:

Polymorphism in the highly flexible organic Schiff-base macrocycle ligand 3,6,9,17,20,23-hexa-azapentacyclo(23.3.1.111,15.02,6.016,20)triaconta-1(29),9,11,13,15(30),23,25,27-octaene (DIEN, C24H30N6) has been studied by single-crystal X-ray diffraction and both solid-state and gas-phase density functional theory (DFT) calculations. In the literature, only solvated structures of the title compound are known. Two new polymorphs and a new solvated form of DIEN, all obtained from the same solvent with different crystallization conditions, are presented for the first time. They all have P\bar 1 symm

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!