Search results for "hierarchy"

Boys Will Be Boys? Subverting Traditional Power Structures in Asian-American Prose

2013

Leaving one’s home country behind and starting a new life on a different continent may also involve being confronted with behaviors and values completely different from the ones that were deemed the only ones back home. This experience is described by the protagonist of the Asian-American author Amy Tan’s story “The Red Candle”, recalling her arrival in California from a small village in China. In her attempt to bridge the gap between the conflicting worlds of “Old East and New West”, the protagonist uses concepts and metaphors that might be transferred and prove valuable in more than one cultural context. In the hierarchy of the culture which is described, a position of power is most of al…

Does the mastery of center-embedded linguistic structures distinguish humans from nonhuman primates?

2005

In a recentScience article, Fitch and Hauser (2004; hereafter, F&H) claimed to have demonstrated that cotton-top tamarins fail to learn an artificial language produced by a phrase structure grammar (Chomsky, 1957) generating center-embedded sentences, whereas adult humans easily learn such a language. We report an experiment replicating the results of F&H in humans but also showing that subjects learned the language without exploiting in any way the center-embedded structure. When the procedure was modified to make the processing of this structure mandatory, the subjects no longer showed evidence of learning. We propose a simple interpretation for the difference in performance observed in F…

Constructing Large 2D Lattices Out of DNA-Tiles.

2021

The predictable nature of deoxyribonucleic acid (DNA) interactions enables assembly of DNA into almost any arbitrary shape with programmable features of nanometer precision. The recent progress of DNA nanotechnology has allowed production of an even wider gamut of possible shapes with high-yield and error-free assembly processes. Most of these structures are, however, limited in size to a nanometer scale. To overcome this limitation, a plethora of studies has been carried out to form larger structures using DNA assemblies as building blocks or tiles. Therefore, DNA tiles have become one of the most widely used building blocks for engineering large, intricate structures with nanometer precis…

Hierarchy of Values and Lifestyle of Managers

2018

Jacobi—Nijenhuis manifolds and compatible Jacobi structures

1999

Abstract We propose a definition of Jacobi—Nijenhuis structures, that includes the Poisson—Nijenhuis structures as a particular case. The existence of a hierarchy of compatible Jacobi structures on a Jacobi—Nijenhuis manifold is also obtained.

Power scaling rules for charmonia production and HQEFT

2001

We discuss the power scaling rules along the lines of a complete Heavy Quark Effective Field Theory (HQEFT) for the description of heavy quarkonium production through a color-octet mechanism. To this end, we firstly derive a tree-level heavy quark effective Lagrangian keeping both particle-antiparticle mixed sectors allowing for heavy quark-antiquark pair annihilation and creation, but describing only low-energy modes around the heavy quark mass. Then we show the consistency of using HQEFT fields in constructing four-fermion local operators a la NRQCD, to be identified with standard color-octet matrix elements. We analyze some numerical values extracted from charmonia production by differen…

On the intrinsic complexity of learning

1995

A new view of learning is presented. The basis of this view is a natural notion of reduction. We prove completeness and relative difficulty results. An infinite hierarchy of intrinsically more and more difficult to learn concepts is presented. Our results indicate that the complexity notion captured by our new notion of reduction differs dramatically from the traditional studies of the complexity of the algorithms performing learning tasks.

Imprenta y poder en el Siglo de Oro. Relaciones y avisos sobre las fiestas reales entre Palermo y Nápoles

2019

Las fiestas reales, con sus ritos y valor simbólico, fueron una herramienta estratégica para fortalecer los vínculos entre el soberano, la nobleza y el pueblo en las provincias del reino. Las relaciones impresas que se conservan sobre las celebraciones reflejan que la monarquía tenía un programa claro para gestionar el consenso político local y reforzar las jerarquías sociales existentes. Se muestran algunos aspectos de esta relación entre imprenta y poder a través de algunas relaciones de sucesos impresas en dos importantes ciudades bajo dominio español: Palermo y Nápoles. Royal celebrations, with their rites and symbolic value, were intended as a strategic tool for the Spanish Crown, in o…

HIERARCHICAL MELTING OF ONE-DIMENSIONAL INCOMMENSURATE STRUCTURES

2016

We study the low—temperature properties of quasi one—dimensional, incommensurate structures which are described by a Frenkel—Kontorova—like model. A new type of renormalization method will be presented, which is determined by the continued fraction expansion of the incommensurability ratio ζ. (This method yields a hierarchy of renormalized Hamiltonians ϰ(n,p) describing the thermal behavior for temperatures T = O(T(n,p)), where T(n,p) follows from the continued fraction expansion of ζ. By means of this method the low—temperature specific heat c(T) and the static structure factor S(q) are calculated for fixed ζ. c(T) possesses a hierarchy of Schottky anomalies related to the rational approxi…

RepeatsDB in 2021: improved data and extended classification for protein tandem repeat structures

2020

The RepeatsDB database (URL: https://repeatsdb.org/) provides annotations and classification for protein tandem repeat structures from the Protein Data Bank (PDB). Protein tandem repeats are ubiquitous in all branches of the tree of life. The accumulation of solved repeat structures provides new possibilities for classification and detection, but also increasing the need for annotation. Here we present RepeatsDB 3.0, which addresses these challenges and presents an extended classification scheme. The major conceptual change compared to the previous version is the hierarchical classification combining top levels based solely on structural similarity (Class > Topology > Fold) with two new lev…