In the years 1878 and 1879 the American physicist Alfred Marshall Mayer published his experiments with floating magnets as a didactic illustration of molecular actions and forms. A number of physicists made use of this analogy of molecular structure. For William Thomson they were a mechanical illustration of the kinetic equilibrium of groups of columnar vortices revolving in circles round their common centre of gravity . A number of modifications of Mayer's experiments were described, which gave configurations which were more (...) or less analogous to Mayer's arrangements. It was Joseph John Thomson who, in publications between 1897 and 1907, used Mayer's results to obtain a good deal of insight into the general laws which govern the configuration of the electrons in his atomic model. This article is mainly concerned with Mayer's experiments with floating magnets and their use by a number of physicists. Through his experiments Mayer made a significant, although small, contribution to the theory of atomic structure. (shrink)

After Jacobus Henricus van't Hoff had passed away on 1 March 1911, his pupil Charles Marinus van Deventer wrote a very personal ‘in memoriam’ in the Dutch literary periodical De Gids, pointing out that van't Hoff had merely been interested in scientific facts, not in the people discovering these facts. Van't Hoff considered the study of the history of chemistry, although by no means uncongenial, a matter of little importance. He once even said: ‘To me historical research appears to be (...) appropriate for a chemist in the decline of life, when he no longer creates professional ideas, and when the laboratory has become a burden to him’. Although van Deventer had studied physical chemistry at van't Hoff's Amsterdam laboratory and had been his assistant from 1885 until 1893, he disagreed with this verdict. Van Deventer was not only a capable physical chemist, he was also an active member of the Tachtigers, a circle of Dutch poets who around 1880 brought about a renewal in Dutch literature. He took a special interest in Greek philosophy. He did not graduate with van't Hoff, but with his colleague Jan Willem Gunning . His thesis was not based on physical-chemical, but on historical research: Schetsen uit de Geschiedenis van de Scheikunde . From 1922 to 1923 he lectured on the history of chemistry at Utrecht University. His fascinating lectures were published as Grepen uit de Historie der Chemie . This work reveals his particular interest in the development of chemical concepts. (shrink)

The Utrecht professor of physics Gerrit Moll , well-known for his defence of British science against Charles Babbage's Reflections on the Decline of Science in England , did—in co-operation with members of the Natuurkundig Gezelschap at Utrecht—important work on the reception in The Netherlands of the new electromagnetic and electrodynamic discoveries . He also carried out fundamental research into the lifting power of electromagnets, which he had seen during his visit to London in 1828. In 1830, Moll published his experiments (...) with strong electromagnets having maximum lifting powers of 38 kilograms. With the results of similar experiments performed in the United States by Joseph Henry and Philip ten Eyck in mind, Moll continued his experiments with stronger electromagnets . Furthermore; he investigated the ability of very small galvanic batteries to develop a perceptible magnetism in a great horseshoe . A practical physicist, Moll was hardly interested in theoretical explanations. In The Netherlands his experiments aroused interest in the practical applications of electro- magnetic force. In the present paper, Moll's contributions to the science of electromagnetism and electrodynamics are discussed. (shrink)

On 17 November 1820 there appeared a Dutch translation of Oersted's pamphlet concerning the discovery of the effect of an electric current on a magnetic needle suspended in the earth's magnetic field . In the Netherlands a number of physicists were immediately interested in the electromagnetic and electrodynamic discoveries made by Oersted and the French physicists. They repeated and extended the experiments, and constructed new modifications of the galvanic battery for better results. They made no fundamental discoveries in this field (...) of physics, but the fact that their work was important follows from the experiments of van Beek, which confirmed Amp`ere's theory of molecular magnetic currents. Van Beek as well as Speyert van der Eyk corresponded with Amp`ere about electromagnetic and electrodynamic phenomena. In the Utrecht Universiteitsmuseum there is an unpublished letter of Amp`ere to van Beek, which is published at the end of this article. (shrink)

This paper describes the introduction of Liebig's ideas on agricultural chemistry into the Netherlands. The aversion to Liebig held by the Utrecht professor G. J. Mulder hindered the direct influence that might have been borne by Liebig's own writings; the introduction was made principally by means of Dutch translations of the text-books of the Scottish agricultural chemist J. F. W. Johnston, who generally followed Liebig's ideas.

The current COVID-19 pandemic has reactivated ancient metaphors but also initiated a new vocabulary: social distancing, lockdown, self-isolation, and sheltering in place. Terminology is not ethically neutral but reflects prevailing value systems. I will argue that there are two metaphorical vocabularies at work: an authoritarian one and a liberal one. Missing is an ecological vocabulary. It has been known for a long time that emerging infectious diseases are associated with the destruction of functioning ecosystems and biodiversity. Ebola and avian influenza (...) viruses have been significant warnings. Obviously, this pandemic will not be the last one. As the planet is our common home, the major metaphor to explore is sheltering at this home. (shrink)

Interactive technology assessment (iTA) provides an answer to the ethical problem of normative bias in evaluation research. This normative bias develops when relevant perspectives on the evaluand (the thing being evaluated) are neglected. In iTA this bias is overcome by incorporating different perspectives into the assessment. As a consequence, justification of decisions based on the assessment is provided by stakeholders having achieved agreement. In this article, agreement is identified with wide reflective equilibrium to show that it indeed has the potential (...) of justifying decisions. We work out several conditions for this agreement to be achievable and just. (shrink)

In this paper, the authors have detected a new effect in the area of geomagnetism, related to the behavior of a magnetic dipole freely floating on water surface. An experiment is described in the present paper in which a magnetic dipole fixed upon a float placed on non- magnetized water surface undergoes displacement along with reorientation caused by fine structure of the earth's magnetic field. This fact can probably be explained by secular decrease of the earth's major dipole moment. Further, (...) a detailed study of the phenomenon may create interesting premises for its practical use, particularly for the analysis of fine structure of geomagnetic field and its time-dependent anomalies. A strange behavior of some sea fish species prior to strong earthquakes may be explained if the fish are assumed as 'live magnetic dipoles'. (shrink)

Philosophy; philosophical theology; philosophical anthropology; history.

BackgroundPublic health scholars have long called for preparedness to help better negotiate ethical issues that emerge during public health emergencies. In this paper we argue that the concept of ethical preparedness has much to offer other areas of health beyond pandemic emergencies, particularly in areas where rapid technological developments have the potential to transform aspects of health research and care, as well as the relationship between them. We do this by viewing the ethical decision-making process as a behaviour, and conceptualising (...) ethical preparedness as providing a health research/care setting that can facilitate the promotion of this behaviour. We draw on an implementation science and behaviour change model, COM-B, to demonstrate that to be ethically prepared requires having the capability, opportunity, and motivation to work in an ethically prepared way.MethodsWe use two case examples from our empirical research—one pandemic and one non-pandemic related—to illustrate how our conceptualisation of ethical preparedness can be applied in practice. The first case study was of the UK NHSX COVID-19 contact tracing application case study involved eight in-depth interviews with people involved with the development/governance of this application. The second case involved a complex case regarding familial communication discussed at the UK Genethics Forum. We used deductive qualitative analysis based on the COM-B model categories to analyse the transcripbed data from each case study.ResultsOur analysis highlighted that being ethically prepared needs to go beyond merely equipping health professionals with skills and knowledge, or providing research governance actors with ethical principles and/or frameworks. To allow or support these different actors to utilise their skills and knowledge, a focus on the physical and social opportunity is important, as is a better understanding the role of motivation.ConclusionsTo understand ethical preparedness, we need to view the process of ethical decision-making as a behaviour. We have provided insight into the specific factors that are needed to promote this behaviour—using examples from both in the pandemic context as well as in areas of health research and medicine where there have been rapid technological developments. This offers a useful starting point for further conceptual work around the notion of being ethically prepared. (shrink)

Background: Older, frail patients with multimorbidity are at an especially high risk for disease severity and death from COVID-19. The social restrictions proved challenging for the residents, their relatives, and the care staff. While these restrictions clearly impacted daily life in Norwegian nursing homes, knowledge about how the pandemic influenced nursing practice is sparse. Aim: The aim of the study was to illuminate ethical difficult situations experienced by Norwegian nurses working in nursing homes during the COVID-19 pandemic. Research design and (...) participants: The research design involved semistructured individual interviews conducted with 15 nurses working in 8 nursing homes in 3 health regions in Norway, within both urban and rural areas. Ethical considerations: Oral and written information about the study was provided before the participants gave their written consent. The transcribed interviews were de-identified. The study was approved by the Norwegian Centre for Research Data. Findings: Four ethical difficult situations were identified: (a) turning the nursing home into a prison; (b) using medication to maintain peace and order; (c) being left alone with the responsibility; and (d) s. impact on decision-making. Conclusions: The nurses’ ethical challenges were intertwined with external factors, such as national and local guidelines, and the nurses’ own internalized factors, which were connected to their subjective professionality. This duality inflicted emotional distress and gave nurses few opportunities to perform nursing in a professionally sound and safe manner. (shrink)

This paper focuses on natural dualities for varieties of bilattice-based algebras. Such varieties have been widely studied as semantic models in situations where information is incomplete or inconsistent. The most popular tool for studying bilattices-based algebras is product representation. The authors recently set up a widely applicable algebraic framework which enabled product representations over a base variety to be derived in a uniform and categorical manner. By combining this methodology with that of natural duality theory, we demonstrate how to build (...) a natural duality for any bilattice-based variety which has a suitable product representation over a dualisable base variety. This procedure allows us systematically to present economical natural dualities for many bilattice-based varieties, for most of which no dual representation has previously been given. Among our results we highlight that for bilattices with a generalised conflation operation. Here both the associated product representation and the duality are new. Finally we outline analogous procedures for pre-bilattice-based algebras. (shrink)