Here, an epidemiological model considering pro and anti-vaccination groups is proposed and analyzed. In this model, susceptible individuals can migrate between these two groups due to the influence of false and true news about safety and efficacy of vaccines. From this model, written as a set of three ordinary differential equations, analytical expressions for the disease-free steady state, the endemic steady state, and the basic reproduction number are derived. It is analytically shown that low vaccination rate and no influx to (...) the pro-vaccination group have similar impacts on the long-term amount of infected individuals. Numerical simulations are performed with parameter values of the COVID-19 pandemic to illustrate the analytical results. The possible relevance of this work is discussed from a public health perspective. (shrink)

There are doubtless many with personal experience of suffering, or of comforting others in distress, who would agree with Milton thus far that philosophic argument is powerless to satisfy those who in their anguish ask the question ‘Why did it happen to me?’ Yet to think so is to underestimate both the necessity and the power of reason: clarity of mind and the disposition to argue are commonly enhanced rather than diminished by suffering; and if reason is an essential part (...) of man's nature, it should serve him, if anywhere, in the trials of life. We have every justification, therefore, despite common opinion, for seeking a rational answer to the question proposed. It must, however, be admitted at the outset that there is no direct answer to the question which can both withstand critical scrutiny and bring genuine comfort to the afflicted, an answer, that is, which accepts the question as it stands with its attendant presuppositions; but there is an indirect answer, which, precisely by rejecting one or more of these presuppositions and restating the question, can indeed satisfy these two requirements. Before such an answer can be outlined, however, the question in its traditional form must be examined and the traditional answers to it critically reviewed. (shrink)

The essays are tied together by the idea that our understanding of cognition is likely to be enhanced by consideration of mechanisms and processes at its ...

The spatial dynamics of the optical emission from an array of 50 times 50 individual microcavity plasma devices is investigated. The array is operated in argon and argon-neon mixtures close to atmospheric pressure with an ac voltage. The optical emission is analysed with phase and space resolution. It has been found that the emission is not continuous over the entire ac period, but occurs once per half period. Each of the observed emission phases shows a self-pulsing of the discharge, with (...) several bursts of emission of fixed width and repetition rate. The number of emission bursts depends on applied voltage and frequency. Spatially resolved measurements prove that the emission bursts are formed by overlapping emission pulses from single discharge cavities. Intensity differences between positive and negative half-wave can be interpreted through spatially resolved measurements of single discharge cavities. (shrink)

Currently living people cannot be said to be wronged because of the wrongless emissons of greenhouse gases by past people. According to the usual subjunctive-historical understanding of harm, currently living people cannot be said to be harmed by the impact of greenhouse emissions on their well-being. By relying on a subjunctive-threshold notion of harm we can justify conclusions about both the present generation’s duties not to violate the rights of future generations, and the present generation’s duties to compensate currently living (...) people for the harms inflicted upon them through the lasting impact of wrongless past harms. This interpretation supports a forward-looking understanding of the grounds of our relating to wrongless past harms. The significance of past harms lies in their consequences for the well-being of currently living and future people. The subjunctive-threshold notion of harm lends support to a standard of minimal, general, and universal justice. Those actors who are in a position to fulfill its requirements are under a duty to do so. Especially the rich and powerful countries ought to counteract the harmful impact of past greenhouse emissions. (shrink)

Let the individuals of a population be divided into two groups with different personal habits. The core group is associated with health risk behaviors; the non-core group avoids unhealthy activities. Assume that the infected individuals of the core group can spread a contagious disease to the whole population. Also, assume that cure does not confer immunity. Here, an epidemiological model written as a set of ordinary differential equations is proposed to investigate the infection propagation in this population. In the model, (...) migrations between these two groups are allowed; however, the transitions from the non-core group into the core group prevail. These migrations can be either spontaneous or stimulated by social pressure. It is analytically shown that, in the scenario of spontaneous migration, the disease is either naturally eradicated or chronically persists at a constant level. In the scenario of stimulated migration, in addition to eradication and constant persistence, self-sustained oscillations in the number of sick individuals can also be found. These analytical results are illustrated by numerical simulations and discussed from a public health perspective. (shrink)

It is difficult to understand the meaning of 'dignity' in human rights, bioethics and nursing literature because the word is used so vaguely. Unless dignity's meaning is spelt out it can disappear beneath more tangible priorities. In this article we define dignity and show how this can help health workers to maintain the dignity of people in their care.