Violation of action--reaction and self-forces induced by nonequilibrium fluctuations

We show that the extension of Casimir-like forces to fluctuating fluids driven out of equilibrium can exhibit two interrelated phenomena forbidden at equilibrium: self-forces can be induced on single asymmetric objects and the action--reaction principle between two objects can be violated. These effects originate in asymmetric restrictions imposed by the objects' boundaries on the fluid's fluctuations. They are not ruled out by the second law of thermodynamics since the fluid is in a nonequilibrium state. Considering a simple reaction--diffusion model for the fluid, we explicitly calculate the self-force induced on a deformed circle. We also show that the action--reaction principle does not apply for the internal Casimir forces exerting between a circle and a plate. Their sum, instead of vanishing, provides the self-force on the circle-plate assembly.Comment: 4 pages, 1 figure. V2: New title; Abstract partially rewritten; Largely enhanced introductory and concluding remarks (incl. new Refs.

Sub-Plate Overlap Code Documentation

An expansion of the plate overlap method of astrometric data reduction to a single plate has been proposed and successfully tested. Each plate is (artificially) divided into sub-plates which can then be overlapped. This reduces the area of a 'plate' over which a plate model needs to accurately represent the relationship between measured coordinates and standard coordinates. Application is made to non-astrographic plates such as Schmidt plates and to wide-field astrographic plates. Indeed, the method is completely general and can be applied to any type of recording media

Sensitivity analysis of the input parameters of a physical based ductile failure model of Ti-6Al-4V for the prediction of surface integrity

In machining of Ti-6Al-4V, it is commonly reported the appearance of segmented chip produced by adiabatic shearing (at high cutting speeds) and lack of ductility (at low cutting speeds). Moreover, machining is a manufacturing process that is based on applying external energy to the workpiece to produce a separation of a material layer. Thus, to analyze the physics involved in the new surface generation and in the chip segmentation process, it is necessary to apply ductile failure models. However, the characterization of fracture models in machining conditions (temperature, strain rate, stress triaxiality, Lode angle etc.) is an arduous task. Therefore, to define a ductile failure model applicable to machining it is almost inevitable to apply inverse simulations strategies to obtain reliable results in the not tested conditions. Nevertheless, there is few information about the influence of the input parameters of ductile failure model in fundamental outputs and even less in surface integrity aspects. The aim of this research was to conduct a sensitivity analysis of the influence of the input parameters of a physical based ductile failure model not only in fundamental variables (forces, temperatures and chip morphology) but also on surface integrity (surface drag). To this end, a subroutine was developed for the ductile failure model and it was implemented in the Finite Element Method (FEM) software AdvantEdge. Subsequently, using a statistical software and the Design of Experiments (DOE) technique the influence of the input parameters of the failure model on the outputs was analyzed

Adubação verde no crescimento e na produção de Schinus terebinthifolius, Hibiscus sabdariffa e Jacaranda decurrens.

bitstream/item/68608/1/005-moreira-adubacao.pdfPublicado também no Cadernos de Agroecologia, v. 7, n.2, 2012

Pr\ue9cis du Plurilinguisme et du pluriculturalisme

This handbook is organized around linguistic and cultural plurality. The French concept of \uab plurality \ubb has different political connotations than the Angloamerican term \uab diversity \ubb. While \uab diversity \ubb is the ideal of a neo-liberal democracy, \uab plurality \ubb is the ideal of a republican society committed to the tenets of the French Revolution. Following Bourdieu (1977), it defines language as an \uab instrument of action (or of power) \ubb and aims to reconstruct the complexity of social and linguistic practices that constitute our relationship to the foreign. Plurality here is not defined as the mere coexistence of various languages, but rather as a specific social activity characterized by the circulation of values across borders, the negotiation of identities, and the inversions\u2013indeed, the inventions\u2013of meaning that are often masked by the shared illusion of successful communication. Plurality is approached in this book: - as a complex aggregate, rather than as the simplified object of a communicatively oriented language pedagogy primarily concerned with intelligibility - as a coherent system of relationships whose description cannot be reduced to a series of mechanical operations - as a socio-historical construct, observable from many simultaneous, spatiotemporal points of view, such as that of everyday interactions or that of institutions whose symbolic force cannot be accounted for from one point of view alone

A Case of a Reversible Cause of Psychosis: Thyroid Storm

Thyroid storm, an exaggerated manifestation of thyrotoxicosis, is a rare and life-threatening endocrine emergency. Physical and emotional stressors can precipitate thyroid storm in patients with underlying thyrotoxic conditions. Patients present with cardiac, GI and CNS dysfunction. The Burch-Wartofsky point scale predicts the likelihood of thyroid storm based upon the presence of these CNS, GI, and cardiovascular symptoms along with thermoregulatory dysfunction. A score of 45 or greater on this scale is indicative of thyroid storm. Treatment of thyroid storm includes a beta blocker, a thionamide, iodine solution, a glucocorticoid, and a bile acid sequestrant. Thyroid storm is a recognized cause of secondary psychosis. Though psychosis due to thyrotoxicosis was first reported in the literature in 1840, few cases have been reported since that time. The most common symptoms of psychosis in these patients include mania, paranoia, hallucinations, and delusions. Abnormal vital signs such as tachycardia, hypertension, and an irregular pulse can help distinguish secondary from primary psychosis. If thyrotoxicosis is a suspected cause of psychosis, then TSH, thyroxine, and thyroid antibodies should be measured. Treatment of the underlying thyrotoxicosis is curative. We present the case of a 28-year-old female with a several psychosocial stressors that presented to the emergency department with symptoms of a manic episode. Work-up included CBC, CMP, CSF studies, HIV panel, urinalysis, UDS, salicylate levels, urine drug screen, K2, Spice, LSD, lead level, Head CT, and Brain MRI. All tests were negative or within normal limits. The patient was initially started on benzodiazepines and then switched to an antipsychotic. After discontinuation of benzodiazepines, the patient\u27s heart rate increased from 110-150s with sinus tachycardia. TSH was In conclusion, thyroid storm should be listed as a differential in patients presenting with psychosis and abnormal vital signs