Simulated annealing method for equilibrium placement problem

The paper proposes a modification of the simulated annealing algorithm as applied to problems that have a fragmented structure. An algorithm for simulating annealing for the traveling salesman problem is considered and its applicability to the optimization problem on a set of permutations is shown. It is proved that the problem of equilibrium placement of point objects on a plane has a fragmentary structure and, therefore, reduces to an optimization problem on a set of permutations. The results of numerical experiments for various types of algorithms for finding the optimal solution in the equilibrium placement problem are presented.

The ordering effects of an n-Si defect structure, induced by high fluences of ions with MeV energies

The results of studies of the structural and optical properties of silicon irradiated with light ions of MeV energies with fluences exceeding 1016 cm–2 are generalized. The structure of silicon irradiated with ions is con ventionally divided into several regions (ion path, braking, and outside the braking region), the kind of which is determined by the type of ions, their mass, energy, and temperature during irradiation. It is established that the irradiation with high fluences of light ions of MeV energies causes the formation of ordered layers in the bulk of silicon at depths up to several hundred microns, associated with defects whose properties differ from those of the matrix. It is shown that, under such irradiation conditions, the nature of the defect formation (the number and width of the revealed ordered linear structures and their location relative to the braking region of ions) depends on the mass and energy of ions, the ion beam intensity, the irradiation temperature, and the crystal properties. The effect of the ordering of defects in the form of stress lines and their propagation outside the braking region was discovered, when silicon was irradiated with ions of both hydrogen and helium. It is found that this effect depends on the irradiation intensity and occurs, only when the beam current density is less than 0.45 μA/cm2. It is established that, for silicon irradiated with helium ions in the region of ion path, characteristic is not the monocrystalline, but fragmentary structure, which has an aggregate of ordered stress lines (associated with defects) located in parallel to the braking band of helium ions, and the braking band consists of voids etched as a continuous layer and in the form of separate clusters. It is revealed that the irradiation of dis location silicon with deuterium ions leads to the movement of dislocations during the irradiation and to their crossing of the deuteron braking line due to the formation of stacking faults.

A desconstrução (dos limites) do “campo da saúde do trabalhador” | The deconstruction (of the limits) of the “field of the health of worker”

Esse artigo possui o objetivo de refletir sobre os limites do “campo da saúde do trabalhador” (“saúde do trabalhador” ou apenas “campo”) na apreensão/intervenção da “questão da saúde dos trabalhadores” (ou apenas “questão”). A partir da revisão de bibliografia sobre a relação trabalho-saúde foram extraídas as informações pertinentes a essa pesquisa teórica, desenvolvida à luz da perspectiva marxiana/lukácsiana. Demonstramos que o “campo”, para se inserir na ciência estabelecida, reproduz a dinâmica geral dessa ciência, com sua estrutura fragmentária. A proposta original de cunho questionador dos teóricos e militantes da “saúde do trabalhador”, pouco em pouco, assume ares de campo científico, delimitando, com seu objeto de estudo, seu instrumental teórico-metodológico e seu paradigma. Com isso, a apreensão e transformação da “questão” pelo “campo” sempre é parcelar e insuficiente. Defendemos que é preciso a desconstrução (dos limites) do “campo” rumo a uma perspectiva da totalidade social, radicalmente oposta à ciência burguesa.Palavras-Chave: campo científico; marxismo; saúde do trabalhador. Abstract – This article aims to reflect on the limits of the “field of the Health of Worker” (“Health of worker” or just “field”) in the apprehension/intervention on the "issue of the health of workers" (or just “issue”). From the literature review on the work-health relationship, the information was extracted for this theoretical research, developed in light of the Marxian/Lukacsian perspective. The “field”, to be inserted into established science, reproduces the general dynamics of this science with its fragmentary structure. The original proposal elaborated by the theoreticians and militants of the “Health of worker” assumes a character of scientific field, delimited, with its object of study, its theoretical-methodological instrument and its paradigm. The apprehension and transformation of the “issue” by the “field” is always piecemeal and insufficient. We argue that it is necessary to deconstruct the “field” (its limits) towards a perspective of social totality, radically opposed to bourgeois science.Keywords: Scientific field. Marxism. Health of Worker.

Objects, Fragments, Scenes, and the Construction of Narrative

This chapter interrogates the construction of narrative out of lyrical and musical fragments and scenes. Tracing displacements and condensations in the blues reveals a metonymic structure underpinning narrative articulations. Close examination of the contexts of reception—including the minstrel show, the juke joint, and most especially the print advertising of race record labels—unearths a system that guides listeners to construct narrative cohesion out of fragments and pieces. Analyzing Charley Patton’s “High Water Everywhere,” Blind Lemon Jefferson’s “Competition Bed Blues,” and Robert Johnson’s “Hellhound on my Trail” uncovers an unstable oscillation between synchronic and diachronic understandings of time that is foregrounded by the blues’ fundamentally fragmentary structure.

On Not Being Able to Sleep: After the U.S. 2016 Presidential Election

Following the 2016 U.S. presidential election, I find myself struggling, wanting to find a narrative that will let me sleep, but I am unable to find any comfort in the current political landscape. I call upon a fragmentary structure in this autoethnographic essay to display the troubling thoughts and incidents that have assailed me since the election, to point toward a frightening right wing agenda, and to demonstrate why I cannot sleep. Each numbered section offers evidence that the moral core of the United States has been deeply damaged by the election of Donald Trump.

Fragmentary structure in the L1551 molecular outflow

We have obtained a high resolution map of the 12CO J=3—2 emission in the vicinity of HH102 in the L1551 molecular outflow. The data reveal the presence of several bright clumps within the thin shell of low-velocity blue-shifted outflowing gas. There is evidence for further fragmentation in the clumps, as signified by the high derived excitation temperatures and low beam-filling factors. The region of peculiarly energetic activity associated with HH102 coincides with the projected location of impact of a radio jet from IRS5 with the dense ambient gas surrounding the outflow cavity.

Fragmentary structure in the L1551 molecular outflow

We have obtained a high resolution map of the 12CO J=3—2 emission in the vicinity of HH102 in the L1551 molecular outflow. The data reveal the presence of several bright clumps within the thin shell of low-velocity blue-shifted outflowing gas. There is evidence for further fragmentation in the clumps, as signified by the high derived excitation temperatures and low beam-filling factors. The region of peculiarly energetic activity associated with HH102 coincides with the projected location of impact of a radio jet from IRS5 with the dense ambient gas surrounding the outflow cavity.