Buckling and Vibration Performance of a Composite Laminated Plate with Elastic Boundaries Subjected to Local Thermal Loading

In this paper, a model is established for the calculation of the vibrations of a composite laminated plate with elastic boundary conditions subjected to local thermal loading. The model is based on first-order shear deformation theory using the finite element method. The influence of boundary conditions, heating area, and heating location on buckling and vibrations of a composite laminated plate was investigated, and there were two stages in which the critical temperature increased sharply during the transition from free boundary to simply supported and rigid fixed boundaries. The thermal buckling of locally heated laminated plates is generally not checked in practical applications unless the heated area exceeds approximately 10% of the total area of the plates. The stronger the boundary constraint is, the greater the influence of the heated area is on the vibrational frequencies of the composite laminated plate.

Hexagonalization of Fishnet integrals. Part I. Mirror excitations

In this paper we consider a conformal invariant chain of L sites in the unitary irreducible representations of the group SO(1, 5). The k-th site of the chain is defined by a scaling dimension ∆k and spin numbers $$ \frac{\ell_k}{2},\frac{\ell_k}{2} $$ ℓ k 2 , ℓ k 2 The model with open and fixed boundaries is shown to be integrable at the quantum level and its spectrum and eigenfunctions are obtained by separation of variables. The transfer matrices of the chain are graph-builder operators for the spinning and inhomogeneous generalization of squared-lattice “fishnet” integrals on the disk. As such, their eigenfunctions are used to diagonalize the mirror channel of the Feynman diagrams of Fishnet conformal field theories. The separated variables are interpreted as momentum and bound-state index of the mirror excitations of the lattice: particles with SO(4) internal symmetry that scatter according to an integrable factorized $$ \mathcal{S} $$ S -matrix in (1 + 1) dimensions

Role of colour in ecological approach to product and material design

The aim of this research paper is to map, document and classify new, progressive and perspective approaches to colour in product and material design. The purpose is to identify the impact and importance of colour in the creation of new materials and products from an ecological point of view. The majority of current progressive approaches to design creation and research is set in an ecological framework, taking into account their impact on the environment. The question is not whether colour is present in this process, but rather where it stands in this process, whether it can help it and how much it affects it. One of the objectives of this article is to raise awareness in this area and to arouse interest in and discussion on this topic. The theme of colours in design is often overlooked and relegated to the background. The results of several scientific studies on the impact of colour on product evaluation and consumer shopping behaviour suggest the potential of this topic and open up space for further research. In this research paper, we consider the approach of product and material designers and researchers to colour in an ecological context, as a stand-alone design and material creation group. Within this main group, individual approaches can be classified into four basic principles, which the paper defines and describes. They are analysed and researched in more depth through specific examples of the work of various designers. The principles have no fixed boundaries, they are not isolated. They influence or follow each other. This classification of the approach to colour in an ecological context allows us primarily to talk about it more professionally and attempt to define its importance and role in individual approach. Ultimately, it helps us answer the question of whether and how colour can affect the process of changing human interaction with the environment.

Sine finibus

This chapter juxtaposes Ovid’s erotic and his exilic elegy. In Rome people could visit and examine Agrippa’s map; expansion and conquest sit hand in glove with powerful fantasies of imposing order, control, and hierarchy. In his early elegiac works Ovid contemplates feminine self-adornment. Luxury goods from foreign places flow to the capital, and the city’s female inhabitants seek out, then display on their bodies, the commodities of empire. Once the Ovidian women cloak themselves in the trappings of empire, however, they become one with their accoutrements. In the second part of the diptych, exilic Ovid, just like his adorned women before him, suffers in the face of absent fines. At the very margins of empire, in Tomis on the Black Sea, when he finds himself contemplating first-hand the permeable fines at the furthest edge of imperium, stable, fixed boundaries evaporate, and hybridization and melange take over. It becomes increasingly difficult to ascertain where imperium ends and the non-Roman world (not-yet-Roman world) begins. The Greeks, the Getans, the barbarians have already mixed together, and ultimately even the one Roman cannot sustain his Romanness.

Variational principle for local fields

The simplest variational problems (with free, fixed boundaries, the Bolz problem) in Banach spaces are considered. Necessary conditions for a local extremum in these problems are derived. An important class of Lagrangian mechanical systems is considered – local loaded fields, for which the Lagrangian has the form of an integral functional. Necessary conditions for the action functional – the Euler-Ostrogradsky equations and transversality conditions – are obtained. The equations of the theory of elasticity and Maxwell electrodynamics are derived from the variational principle for local fields.

Film fabularny jako narzędzie kuratora i badacza sztuki

In the essay, the author, Łukasz Ronduda, relates his own work as an artist, a film director, an art historian and curator, discussed in the light of the cinematic turn and the formation of common ground between cinema and contemporary art in both artistic and institutional sense. Ronduda looks closely at his two full-length feature films: Performer (2015) and Serce miłości (Heart of Love) (2017) and highlights their wider context. The first frame of reference spans from experimental films to contemporary full-length productions dedicated to wide audience. The second reference is his own work involving academic research, curating, writing a novel and the creation of a found footage film. In this self-presentation, Ronduda discloses his different attempts to find the right medium to speak about and analyze contemporary art. The full-length film turned out to be particularly effective medium in its ability to express the truth by means of fiction, placing him between creation and institutional structure. Film as a medium of interpreting art seems to productively question fixed boundaries between research, criticism and art.

MEMS Vibrational Power Generator for Bridge Slab and Pier Health Monitoring

Micro energy harvesters (MEH) based on microelectromechanical systems (MEMS) are rapidly developing, providing a green and virtually infinite energy source. The electrostatic vibratory power generator outputs electric power when it vibrates, motivating us to apply it to vibrating civil infrastructures excited by ambient and daily traffic loadings. In this study, an innovative monitoring system utilizing MEH devices was proposed for detecting slab damage and pier scours for bridge structures. Its performance was numerically investigated with finite element models, where the damage in slabs was modeled with a reduced Young’s modulus and scours with fixed boundaries of inclined depth. It was shown that the powers generated at each MEH varied as the target structure’s modal frequency shifted and amplitude changed by damage or scour. A power generation index was proposed to identify slab damage and a reference-free method was introduced to detect uneven pier scours. Utilizing an electrostatic vibration-based MEH (MEMS vibrational power generator), this pioneering study showed that MEMS vibrational power generators can work as sensors for an infrastructure structural health monitoring system.

Real-time drone derived thermal imagery outperforms traditional survey methods for an arboreal forest mammal

Koalas (Phascolarctos cinereus) are cryptic and currently face regional extinction. The direct detection (physical sighting) of individuals is required to improve conservation management strategies. We provide a comparative assessment of three survey methods for the direct detection of koalas: systematic spotlighting (Spotlight), remotely piloted aircraft system thermal imaging (RPAS), and the refined diurnal radial search component of the spot assessment technique (SAT). Each survey method was repeated on the same morning with independent observers (03:00–12:00 hrs) for a total of 10 survey occasions at sites with fixed boundaries (28–76 ha) in Port Stephens (n = 6) and Gilead (n = 1) in New South Wales between May and July 2019. Koalas were directly detected on 22 occasions during 7 of 10 comparative surveys (Spotlight: n = 7; RPAS: n = 14; and SAT: n = 1), for a total of 12 unique individuals (Spotlight: n = 4; RPAS: n = 11; SAT: n = 1). In 3 of 10 comparative surveys no koalas were detected. Detection probability was 38.9 ± 20.03% for Spotlight, 83.3 ± 11.39% for RPAS and 4.2 ± 4.17% for SAT. Effective detectability per site was 1 ± 0.44 koalas per 6.75 ± 1.03 hrs for Spotlight (1 koala per 6.75 hrs), 2 ± 0.38 koalas per 4.35 ± 0.28 hrs for RPAS (1 koala per 2.18 hrs) and 0.14 ± 0.14 per 6.20 ± 0.93 hrs for SAT (1 koala per 43.39 hrs). RPAS thermal imaging technology appears to offer an efficient method to directly survey koalas comparative to Spotlight and SAT and has potential as a valuable conservation tool to inform on-ground management of declining koala populations.

What is Culture? Systems of People, Places, and Practices

Culture is a fuzzy concept without fixed boundaries, meaning different things according to situations. To address this issue, I introduce a p-model to understand culture as a system of people, places, and practices, for a purpose such as enacting, justifying, or resisting power. People refers to population dynamics, social relations, and culture in groups. Places refers to ecological dynamics, institutional influences, and culture in contexts. Practices refers to participatory dynamics, community engagement, and culture in action. Power refers to forcing others into compliance (power-over people), controlling access to spaces (power-in places), and behaving as desired (power-to practice). I use racism to illustrate the p-model and suggest applications in theory, research, and practice in developmental sciences.