Diagrammatic Structure Research Articles

Facilitating Holistic Nursing Through the Development of Mindfulness: A Model for Student Nurses.

Holistic nursing should be a goal for all nurses. Patients that receive holistic nursing feel acknowledged, valued, and appreciated. Caring for patients holistically requires student nurses to possess and display attributes of mindfulness and Ubuntu. Student nurses therefore need to be supported and taught how to provide caring holistically to patients while being aware, being present, and conscious in the caring moment. The purpose of this article was to describe the model developed as a frame of reference to facilitate holistic nursing through developing mindfulness and Ubuntu. A theory generative, exploratory, and contextual research design was followed. A diagrammatic structure was constructed after the concept analysis was conducted. The model consisted of three phases with an outcome of a student nurse who is caring holistically and mindfully. The model provides a framework of reference to facilitate holistic nursing through the development of mindfulness. This study adds a model of mindfulness and a lens of looking at mindfulness through an African philosophy of Ubuntu.

Mathematical topology and geometry-based classification of tauopathies

Neurodegenerative diseases, like Alzheimer’s, are associated with the presence of neurofibrillary lesions formed by tau protein filaments in the cerebral cortex. While it is known that different morphologies of tau filaments characterize different neurodegenerative diseases, there are few metrics of global and local structure complexity that enable to quantify their structural diversity rigorously. In this manuscript, we employ for the first time mathematical topology and geometry to classify neurodegenerative diseases by using cryo-electron microscopy structures of tau filaments that are available in the Protein Data Bank. By employing mathematical topology metrics (Gauss linking integral, writhe and second Vassiliev measure) we achieve a consistent, but more refined classification of tauopathies, than what was previously observed through visual inspection. Our results reveal a hierarchy of classification from global to local topology and geometry characteristics. In particular, we find that tauopathies can be classified with respect to the handedness of their global conformations and the handedness of the relative orientations of their repeats. Progressive supranuclear palsy is identified as an outlier, with a more complex structure than the rest, reflected by a small, but observable knotoid structure (a diagrammatic structure representing non-trivial topology). This topological characteristic can be attributed to a pattern in the beginning of the R3 repeat that is present in all tauopathies but at different extent. Moreover, by comparing single filament to paired filament structures within tauopathies we find a consistent change in the side-chain orientations with respect to the alpha carbon atoms at the area of interaction.

Megadungeon: A Model for Media Complexity

The essay aims to propose the diagrammatic structure of the megadungeon as a metaphor to represent the complexity, interconnectedness, and multi-layered nature of the current media scenario, including its active branches such as new media art and Digital Humanities. The reference is drawn from the concept of the dungeon, which has been successfully introduced into the realm of role-playing games since the 1970s. Conventionally, a dungeon refers to a complex, multi-level maze of corridors, tunnels, rooms, and hidden chambers. The nature of dungeons is to be theoretically infinite floor plans that game designers have learned to produce algorithmically: when they cross a certain size threshold, they are known as megadungeons. In this article, I propose the megadungeon as a productive topological model that intersects different sociotechnical aspects of digital media, drawing on shared characteristics such as a layered structure, labyrinthine exploration, game-derived grammar, and an affinity with computational domain. Additionally, the essay proposes comparisons with similar representation models that challenge outdated cartographic metaphors and addresses specific connections between new media and the concepts of verticality and stratification

Metacognition and diagrams in marking-for-self

Abstract Metacognition relies on representations, which are commonly viewed as internal knowledge structures. We explore the idea that external embodied diagrams, rather than monomodal symbolic-based entities, can provide an accurate description of metacognition in choreographic dance. When marking, dancers use their bodies to represent properties, dynamics, or structures of dance phrases. Marking-for-self occurs when a dancer marks the dance in their own unique manner, potentially allowing for real-time reflection through the manipulation of external signs. These manipulations can be considered diagrammatic semiosis, as diagrams signify shared relational parts analogous to the parts of their objects. Based on Peirce’s semiotics, we argue that semiosis is crucial for metacognition. This paper is structured to first review marking and marking-for-self, followed by an overview of metacognition. We then define marking-for-self as a metacognitive phenomenon and introduce Peirce’s concept of semiosis and diagrams. Finally, we describe marking as a diagrammatic sign and explain how marking-for-self is an embodied metacognitive process achieved through the manipulation of diagrammatic structures.

Diagrammatic structures of the Nielsen identity

The Γ-function, or the effective potential of a gauge field theory should comply with the Nielsen identity, which implies how the effective potential evolves as we shift the gauge-fixing term. In this paper, relying on an abelian toy model, we aim at proving this identity in a diagrammatic form with the R‾ξ gauge. The basic idea is to find out the ghost chain after partially differentiating the diagram by the ξ parameter, and shrink the waists of the diagram into points to separate the bulk-part and C-part of the diagrams. The calculations can be generalized to the models implemented with non-abelian groups, multiple Higgs and fermion multiplets, and to the finite temperature cases.

Deconstructing squark contributions to di-Higgs production at the LHC

We present a novel approach to the study of di-Higgs production via gluon-gluon fusion at the LHC. The relevant Feynman diagrams involving two Standard Model-like Higgs bosons $hh$ are computed within a simplified model approach that enables one to interpret possible signals of new physics in a model-independent way as well as to map these onto specific theories. This is possible thanks to a decomposition of such a signal process into all its squared amplitudes and their relative interferences, each of which has a well-defined coupling structure. We illustrate the power of this procedure for the case of both a minimal and next-to-minimal representation of supersymmetry, for which the new physics effects are due to top squarks entering the loops of $gg\ensuremath{\rightarrow}hh$. The squarks yield both a change of the integrated cross section and peculiar kinematic features in its differential distributions with respect to the Standard Model. These effects can in turn be traced back to the relevant diagrammatic and coupling structures and allow for a detailed analysis of the process. In order to do so, we perform systematic scans of the parameter spaces of such new physics scenarios and identify benchmark points which exhibit potentially observable features during the current and upcoming runs of the LHC.

A formal, diagrammatic, and operational study of normative relations

Abstract In this work, we provide an extensive analysis of Hohfeld’s theory of normative relations, focusing in particular on diagrammatic structures. Our contribution is threefold. First, we specify an extensional formal language to represent the main notions in the two families of normative relations identified by Hohfeld (i.e. the deontic and the potestative family). Our primary focus is on the part of the theory concerning potestative relations. In this regard, we assign a key role to the concept of ability, which is treated as a primitive notion and used to formulate three fine-grained definitions of power (outcome-centered, change-centered and force-centered). Second, on the basis of these definitions we build Aristotelian diagrams of opposition for deontic and potestative relations, improving, extending and systematizing previous proposals formulated in the literature. Third, we present a model-theoretic interpretation and a logic programming (ASP) implementation of the proposed framework, elaborating on the procedural dimension of normative reasoning.

Blubilds – drawing diagrammatic stains

This project adopts the concept of a dance diagram such as Andy Warhol’s Fox Trot (1962) introduced by Rosalind Krauss in her writing on the relationship of material forces in a diagrammatic structure to create a model of notation with actions and objects derived from Edgelands. Coined by Marion Shoard, Edgelands are post-industrial cityscapes, a typology of abandon, dereliction and decay. Shoard notes these sites are characterized by creative cultural practices of photography and graffiti; urban explorers, parkour. My Blubilds project aimed to challenge these cultural practices of parkour and graffiti to provoke new engagement in those sites. To this end, I apply the concept of Rosalind Krauss’s resistant diagram and gravity I adapted from Formless: A User’s Guide (). Gravity is a force of undoing to remake spaces – and I draw with my body and equipment to facilitate gravity within a dance diagram to create a new space. This contrasts the cultural practices such as Graffiti and parkour and breaks with those existing activities to tag, mark and leave a new trace in Edgelands. Blubilds draw a live embodied diagram, based on the movement patterns found in Edgeland sites, since ‘action’ is to draw a line with the body. Tim Ingold’s approach to drawing informs my perspective that lines of movement that draw (in) place engage with the lived narratives of those places. Ingold suggests that the narratives that make place are created by entangled lines created by movement; furthermore, to ‘draw out’ – as in Douglas phrase – suggests that drawing in place ‘draws-out’ new spaces. Blue is emblematic as a nod to Krauss’s ‘rude noise, the blueprint and the acts of Graffiti’, it becomes Blubilds – a dynamic diagrammatic stain.

Review: Descendants of Aztec Pictography: The Cultural Encyclopedias of Sixteenth-Century Mexico, by Elizabeth Hill Boone

Review: <i>Descendants of Aztec Pictography: The Cultural Encyclopedias of Sixteenth-Century Mexico</i>, by Elizabeth Hill Boone

Feynman-Vernon influence functional approach to quantum transport in interacting nanojunctions: An analytical hierarchical study

We present a nonperturbative and formally exact approach for the charge transport in interacting nanojunctions based on a real-time path-integral formulation of the reduced system dynamics. For reservoirs of noninteracting fermions, the exact trace over the leads' degrees of freedom results in the time-nonlocal Feynman-Vernon influence functional, a functional of the Grassmann-valued paths of the nanojunction, which induces correlations among the tunneling transitions in and out of the nanojunction. An expansion of the influence functional in terms of the number of tunneling transitions, and integration of the Grassmann variables between the tunneling times, allows us to obtain a still exact generalized master equation for the populations of the reduced density matrix in the occupation-number representation, as well as a formally exact expression for the current. By borrowing the nomenclature of the famous spin-boson model, we parametrize the two-state dynamics of each single-particle fermionic degree of freedom, in the occupation-number representation, in terms of blips and sojourns. We apply our formalism to the exactly solvable resonant level model (RLM) and to the single-impurity Anderson model (SIAM), the latter being a prototype system for studying strong correlations. For both systems, we demonstrate a hierarchical diagrammatic structure. While the hierarchy closes at the second tier for the RLM, this is not the case for the interacting SIAM. Upon inspection of the current kernel, known results from various perturbative and nonperturbative approximation schemes to quantum transport in the SIAM are recovered. Finally, a noncrossing approximation for the hierarchical kernel is developed, which enables us to systematically decrease temperature at each next level of the approximation. Analytical results for a simplified fourth-tier scheme are presented both in equilibrium and nonequilibrium and with an applied magnetic field.

Presenting possibilities, plans, pathways, programmes: NASA’s use of strategic roadmapping visuals

ABSTRACT Strategic roadmaps provide a visual approach for structuring long-term plans, conveying policy commitments, summarising an organisation’s intent and depicting prospective pathways to realising a vision. When it comes to generating roadmaps and deploying them to enhance communication, NASA is the preeminent author and publisher of these purposeful visualisations. They have a breadth and depth of experience, consistently creating strategic roadmaps since the early 1960s, and have produced a rich array of various types spanning the spectrum of organisational/programme levels and administrative functions. In addition to highlighting notable examples published by NASA, a critique and contrast are made in respect of their presentational style, message design and narrative sequence, content and substance, diagrammatic structure, orientation and format.

Improved Field Theoretical Approach to Noninteracting Brownian Particles in a Quenched Random Potential

We construct a dynamical field theory for noninteracting Brownian particles in the presence of a quenched Gaussian random potential. The main variable for the field theory is the density fluctuation which measures the difference between the local density and its average value. The average density is spatially inhomogeneous for given realization of the random potential. It becomes uniform only after averaged over the disorder configurations. We develop the diagrammatic perturbation theory for the density correlation function and calculate the zero-frequency component of the response function exactly by summing all the diagrams contributing to it. From this exact result and the fluctuation dissipation relation, which holds in an equilibrium dynamics, we find that the connected density correlation function always decays to zero in the long-time limit for all values of disorder strength implying that the system always remains ergodic. This nonperturbative calculation relies on the simple diagrammatic structure of the present field theoretical scheme. We compare in detail our diagrammatic perturbation theory with the one used in a recent paper [B.\ Kim, M.\ Fuchs and V.\ Krakoviack, J.\ Stat.\ Mech.\ (2020) 023301], which uses the density fluctuation around the uniform average, and discuss the difference in the diagrammatic structures of the two formulations.

Intermolecular interaction energies from fourth order many-body perturbation theory. Impact of individual electron correlation contributions.

The performance of Møller-Plesset perturbation theory methods for describing intermolecular interaction energies has been investigated with the focus on illuminating the impact of individual electron correlation energy contributions in fourth order. It is shown that a physically meaningful decomposition of the fourth order correlation energy can be obtained by grouping individual correlation energy terms that share the same diagrammatic loop structure. This decomposition of the fourth order singles (S), doubles (D), triples (T), and quadruples (Q) terms revealed that individual terms from each excitation class can have a huge impact on the energy that is much larger than the total fourth order correlation contribution. A partial summation of S, D, and Q terms has been derived that can reproduce the full fourth order interaction energies with a good accuracy and which does not include the computationally expensive triples energy term.

Quantum field formalism for the higher-derivative nonrelativistic electrodynamics in 1+1 dimensions

Starting from the classical nonrelativistic electrodynamics in 1[Formula: see text]+[Formula: see text]1 dimensions, a higher-derivative version is proposed. This is made by adding a suitable higher-derivative term for the electromagnetic field to the Lagrangian of the original electrodynamics, preserving its gauge invariance. By following the usual Hamiltonian method for singular higher-derivative systems, the canonical quantization for the higher-derivative model is developed. By extending the Faddeev–Senjanovic algorithm, the path integral quantization is carried out. Hence, the Feynman rules are established and the diagrammatic structure is analyzed. The use of the higher-derivative term eliminates in the Landau gauge the ultraviolet divergence of the primitively divergent Feynman diagrams of the original model, where the electromagnetic field propagator is present. A generalization of the BRST quantization is also considered.

Fermi gas throughout the BCS-BEC crossover: Comparative study of t -matrix approaches with various degrees of self-consistency

The diagrammatic t-matrix approximation has often been adopted to describe a dilute Fermi gas. This approximation, originally considered by Galitskii for a repulsive inter-particle interaction (Galitskii-1958), has later been widely utilized for an attractive Fermi gas to describe the BCS-BEC crossover from strongly overlapping Cooper pairs in weak coupling to non-overlapping composite bosons in strong coupling. Several variants of the $t$-matrix approximation have been considered in the literature, which are distinguished by the degree of self-consistency allowed in the building blocks of the diagrammatic structure. Here, we perform a systematic and comparative study of all possible variants on the degree of self-consistency for the $t$-matrix approximation in an attractive Fermi gas, which enables us to confront their outcomes for thermodynamic and dynamical quantities on the same footing in an unbiased way. For definiteness, only the normal phase above the superfluid critical temperature is considered. The dispute that can be raised in this context, about the adequateness of introducing progressive degrees of self-consistency over and above the non-self-consistent $t$-matrix approximation for an attractive Fermi gas, parallels the recent interest in the literature on assessing the importance of various degrees of self-consistency in the context of semiconductors and insulators.

Bringing Inferentialism to Science Education

In this article, I introduce Robert Brandom’s inferentialism as an alternative to common representational interpretations of constructivism in science education. By turning our attention away from the representational role of conceptual contents and toward the norms governing their use in inferences, we may interpret knowledge as a capacity to engage in a particular form of social activity, the game of giving and asking for reasons. This capacity is not readily reduced to a diagrammatic structure defining the knowledge to be acquired. By considering the application of these ideas to the concept of electrical current and the use of analogies in science education, I hope to illustrate how they may be given practical employment as the child comes to explore within the concepts derived from historical scientific endeavours and not merely meander through her individual experiences of scientific phenomena themselves. In moving away from the representational role of analogy, our focus shifts from the quality of the analogy itself toward the quality of the discourse utilising the analogy.

Heavy Ion Charge Exchange Reactions as Probes for Beta–Decay

Peripheral heavy ion single and double charge reactions are described by fully quantum mechanical distorted wave methods. A special class of nuclear double charge exchange (DCE) reactions proceeding as a one-step reaction through a two-body process are shown to proceed by nuclear matrix elements of a diagrammatic structure as found also in 0ν2ß decay. These hadronic Majorana-type DCE reactions (MDCE) have to be distinguished from second order DCE reactions, given by double single charge exchange (DSCE) processes, resembling 2ν2ß decay. The theoretical concepts of MDCE are discussed. First results show that ion-ion DCE reactions are the ideal testing grounds for investigations of rare second order nuclear processes, giving insight into nuclear in-medium two-body correlation.

Structured Image Framework Theory (SIFT): A neurologically based diagrammatic structure enabling the therapist to describe emotionally distressing situations within known brain functions

Structured Image Framework Theory (SIFT): A neurologically based diagrammatic structure enabling the therapist to describe emotionally distressing situations within known brain functions

Constructions of the moving body: drawing and dancing

ABSTRACTThis article explores the author’s practice-led approach to visualising movement through drawing. Haley approaches movement across the disciplines of fine arts and performance, with a focus on dance, drawing and diagramming. In this paper, the author explores the relation between drawing and movement through the lens of the diagram as a graphic archival form. The author proposes that the diagram – as an assemblage of information, rather than a representation of objects in space – is a material and conceptual model for ‘recording’ dance with potential for future animation. Haley’s research begins with recorded material of American choreographer Trisha Brown’s work Accumulation 1971, which is viewed while simultaneously drawing movement. In an iterative process of drawing after drawing, Haley extracts common points of connecting lines within diagrammatic structures. The structures are described by overlaying translucent layers of watercolour to form visualisations that document choreographed movement. Haley’s research creates diagrams for moving through three-dimensional space that aim to forge connections between drawn documentation and the transience of dance in performance.

On the Relation between Equation-of-Motion Coupled-Cluster Theory and the GW Approximation.

We discuss the analytic and diagrammatic structure of ionization potential (IP) and electron affinity (EA) equation-of-motion coupled-cluster (EOM-CC) theory, in order to put it on equal footing with the prevalent GW approximation. The comparison is most straightforward for the time-ordered one-particle Green's function, and we show that the Green's function calculated by EOM-CC with single and double excitations (EOM-CCSD) includes fewer ring diagrams at higher order than does the GW approximation, due to the former's unbalanced treatment of time-ordering. However, the EOM-CCSD Green's function contains a large number of vertex corrections, including ladder diagrams, mixed ring-ladder diagrams, and exchange diagrams. By including triple excitations, the EOM-CCSDT Green's function includes all diagrams contained in the GW approximation, along with many high-order vertex corrections. In the same language, we discuss a number of common approximations to the EOM-CCSD equations, many of which can be classified as elimination of diagrams. Finally, we present numerical results by calculating the principal charged excitations energies of the molecules contained in the so-called GW100 test set [ J. Chem. Theory Comput. 2015 , 11 , 5665 - 5687 ]. We argue that (in molecules) exchange is as important as screening, advocating for a Hartree-Fock reference and second-order exchange in the self-energy.