Crookes's radiometers: a train of thought manifest

Author(s):  
Jane Wess

The Royal Society is to exhibit its collection of original radiometers by William Crookes in the 350th anniversary re-display, thus providing an opportune moment to study the instruments in some detail. This paper attempts to trace Crookes's line of enquiry as described in a series of papers in Philosophical Transactions , linking the individual objects with the particular experiments in which they participated. From these accounts of painstaking technical endeavours, involving the construction of these exquisite objects, we gain an insight into the challenges, both physical and intellectual, posed by the exploration of new extremes of sensitivity and pressure. The radiometer's charm has been lasting, and Crookes's legacy is to allow us to follow a train of thought through a series of beautiful artefacts.

In the spring of the year 1758 John Dollond (F.R.S., 1761) first came on the market with his new telescope object-glass, in which both the chromatic and spherical aberration were corrected: the small firm of Peter and John Dollond became famous very quickly. On 19 April 1758, Dollond was issued a patent for the duration of 14 years, and later in the year he was awarded the Copley Medal of the Royal Society. However, soon after this, a rumour spread in optical circles that Dollond had stolen the new construction from Chester Moor Hall, the real inventor. Who was Chester Moor Hall? Unfortunately we have very little knowledge of him. He was born in late 1704 on the estates of Moor Hall in Sutton, near Rochfort, in the county of Essex. His baptism took place on 9 December 1704. His parents were well- off and promoted his studies to become a lawyer. He opened a law office and became a bencher of the Inner Temple, an old London legal institution. In 1733, he was one of the subscribers to Dr Jebb’s new edition of Roger Bacon’s Opus Majus , which indicates his extensive scientific education. Later on, he occupied the position of Justice of the Peace on his estates in Essex. Hall never published any information about his research on the achromatic object glass. The only written documents to survive him are some signatures on judicial files. He died on 17 March 1771. Because John Dollond was also very reticent about his methods and train of thought, the invention of the achromatic telescope objective has remained in some mystery and nebulous darkness. The author of this paper is now in possession of three telescopes from the middle of the eighteenth century, of which the object glasses have all the same construction, but differ very much from the normal construction of English object glasses from this time. I shall describe the main optical research on these three objectives. The results of these measurements give us insight into the thoughts and the practical methods of their inventor. In this short paper, some of the details may not be intelligible to readers who are not familiar with theoretical and practical optics. I would, however, be pleased to explain any problems which may occur, for interested readers.


Author(s):  
Andrew M. Yuengert

Although most economists are skeptical of or puzzled by the Catholic concept of the common good, a rejection of the economic approach as inimical to the common good would be hasty and counterproductive. Economic analysis can enrich the common good tradition in four ways. First, economics embodies a deep respect for economic agency and for the effects of policy and institutions on individual agents. Second, economics offers a rich literature on the nature of unplanned order and how it might be shaped by policy. Third, economics offers insight into the public and private provision of various kinds of goods (private, public, common pool resources). Fourth, recent work on the development and logic of institutions and norms emphasizes sustainability rooted in the good of the individual.


2021 ◽  
Vol 9 (5) ◽  
pp. 1087
Author(s):  
Loreley Castelli ◽  
María Laura Genchi García ◽  
Anne Dalmon ◽  
Daniela Arredondo ◽  
Karina Antúnez ◽  
...  

RNA viruses play a significant role in the current high losses of pollinators. Although many studies have focused on the epidemiology of western honey bee (Apis mellifera) viruses at the colony level, the dynamics of virus infection within colonies remains poorly explored. In this study, the two main variants of the ubiquitous honey bee virus DWV as well as three major honey bee viruses (SBV, ABPV and BQCV) were analyzed from Varroa-destructor-parasitized pupae. More precisely, RT-qPCR was used to quantify and compare virus genome copies across honey bee pupae at the individual and subfamily levels (i.e., patrilines, sharing the same mother queen but with different drones as fathers). Additionally, virus genome copies were compared in cells parasitized by reproducing and non-reproducing mite foundresses to assess the role of this vector. Only DWV was detected in the samples, and the two variants of this virus significantly differed when comparing the sampling period, colonies and patrilines. Moreover, DWV-A and DWV-B exhibited different infection patterns, reflecting contrasting dynamics. Altogether, these results provide new insight into honey bee diseases and stress the need for more studies about the mechanisms of intra-colonial disease variation in social insects.


2021 ◽  
Vol 11 (2) ◽  
pp. 157
Author(s):  
Marcell Virág ◽  
Tamas Leiner ◽  
Mate Rottler ◽  
Klementina Ocskay ◽  
Zsolt Molnar

Hemodynamic optimization remains the cornerstone of resuscitation in the treatment of sepsis and septic shock. Delay or inadequate management will inevitably lead to hypoperfusion, tissue hypoxia or edema, and fluid overload, leading eventually to multiple organ failure, seriously affecting outcomes. According to a large international survey (FENICE study), physicians frequently use inadequate indices to guide fluid management in intensive care units. Goal-directed and “restrictive” infusion strategies have been recommended by guidelines over “liberal” approaches for several years. Unfortunately, these “fixed regimen” treatment protocols neglect the patient’s individual needs, and what is shown to be beneficial for a given population may not be so for the individual patient. However, applying multimodal, contextualized, and personalized management could potentially overcome this problem. The aim of this review was to give an insight into the pathophysiological rationale and clinical application of this relatively new approach in the hemodynamic management of septic patients.


Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2278
Author(s):  
Anna Micheluz ◽  
Eva Mariasole Angelin ◽  
João Almeida Lopes ◽  
Maria João Melo ◽  
Marisa Pamplona

Light is a determining factor in the discoloration of plastics, and photodegradation processes can affect the molecular structures of both the polymer and colorants. Limited studies focused on the discoloration of heritage plastics in conservation science. This work investigated the discoloration of red historical polyethylene (PE) objects colored with PR 48:2 and PR 53:1. High-density and low-density PE reference polymers, neat pigment powders, and historical samples were assessed before and after accelerated photoaging. The applied methodology provided insight into the individual light-susceptibility of polyethylenes, organic pigment lakes, and their combined effect in the photoaging of historical plastic formulations. After light exposure, both PE references and historical samples yellowed, PR53:1 faded, and PR 48:2 darkened; however, both organic pigments faded severely in the historical samples. This highlights the role played by the plastic binder likely facilitating the pigment photofading. Fourier transform infrared spectroscopy and mass spectrometry techniques—EGA-MS, PY-GC/MS, and TD-GC/MS—were successfully employed for characterizing the plastic formulations and degradation. The identification of phthalic compounds in both aged β-naphthol powders opens new venues for studies on their degradation. This work’s approach and analytical methods in studying the discoloration of historical plastics are novel, proving their efficacy, reliability, and potentiality.


2020 ◽  
Vol 55 (3) ◽  
pp. 151-162
Author(s):  
Danuta Urban ◽  
Joanna Sender ◽  
Ewelina Tokarz ◽  
Andrzej Różycki

AbstractIn view of the sensitivity of Liparis loeselii to changes in habitat conditions, we carried out a study with the aim to monitor population numbers, identify the individual features of the Liparis loeselii population, analyse habitat conditions, identify threats and propose conservation measures to preserve the species. The investigations were conducted in seven unmanaged objects located in three Natura 2000 areas in eastern Poland. The results of this study provide a new insight into Liparis loeselii ecology. The analysed populations inhabited some habitat types: extremely poor fen, transitional mire, rich fen, calcareous fen, spring-fed fen. The content of nutrients was similar in all the habitats. A CCA analysis revealed that the total carbon content, pH, and redox potential of the substrate determine differences between the habitats analysed. Juvenile individuals represented a maximum of 12% of the analysed populations and were the least abundant group of these plants. The flowering was primarily influenced by hydrological conditions. Based on the long-term observations reported in this article, it can be assumed that the species stands a chance of surviving at the localities analysed, provided that the habitat conditions do not change dramatically.


2005 ◽  
Vol 14 (1) ◽  
pp. 141-162
Author(s):  
Clare Spencer

This essay presents a comparative study of the sociological assumptions implicit, and to some extent explicit, in the work of two famous architects, Charles Rennie Mackintosh and Le Corbusier. The inhabitant implied through the architectural practice of Le Corbusier resembles Elias's homo clausus (closed person), the mode of self experience viewed by Elias as the dominant one in Western society and one which sees the individual person as a ‘thinking subject’ and the starting point of knowledge. Mackintosh's designs, in contrast, imply individual people closer to Elias‘s homines aperti, social beings who are shaped through social interaction and interdependence. This paper demonstrates how, as well as fulfilling social, cultural and political needs, architecture carries, within in its designs, certain assumptions about how people and how they do, and should, live. The adoption of an Eliasian perspective provides an interesting insight into how these assumptions can shape self-experience and social interaction in the buildings of each architect.


2018 ◽  
Author(s):  
Rodrigo M. Braga ◽  
Koene R. A. Van Dijk ◽  
Jonathan R. Polimeni ◽  
Mark C. Eldaief ◽  
Randy L. Buckner

Examination of large-scale distributed networks within the individual reveals details of cortical network organization that are absent in group-averaged studies. One recent discovery is that a distributed transmodal network, often referred to as the ‘default network’, is comprised of two separate but closely interdigitated networks, only one of which is coupled to posterior parahippocampal cortex. Not all studies of individuals have identified the same networks and questions remain about the degree to which the two networks are separate, particularly within regions hypothesized to be interconnected hubs. Here we replicate the observation of network separation across analytical (seed-based connectivity and parcellation) and data projection (volume and surface) methods in 2 individuals each scanned 31 times. Additionally, 3 individuals were examined with high-resolution fMRI to gain further insight into the anatomical details. The two networks were identified with separate regions localized to adjacent portions of the cortical ribbon, sometimes inside the same sulcus. Midline regions previously implicated as hubs revealed near complete spatial separation of the two networks, displaying a complex spatial topography in the posterior cingulate and precuneus. The network coupled to parahippocampal cortex also revealed a separate region directly within the hippocampus at or near the subiculum. These collective results support that the default network is composed of at least two spatially juxtaposed networks. Fine spatial details and juxta-positions of the two networks can be identified within individuals at high resolution, providing insight into the network organization of association cortex and placing further constraints on interpretation of group-averaged neuroimaging data.


2021 ◽  
Author(s):  
Sarah Glen

Very few interdisciplinary participatory video research projects have critically assessed how an individual first engages and then continues Freire's "conscientization" or the transformative process toward civic agency, and the role participatory video plays in this process. See Me. Hear Me. Talk To Me. is a participatory video research project that aimed to break new ground in professional participatory video practice by focusing on the individual transformative processes of a small group of at-risk, street involved youth engaged in a participatory action research (PAR) video project. This participatory video research project aimed to gain a small, but specific insight into the transformative processes of at-risk, street involved youth by exploring their experiences and personal perspectives before, during and after the project. In doing so, it intended to add to the current, but very limited research in participatory video projects with street involved youth in order to encourage further interdisciplinary study, as well as the development of some preliminary reference tools to help governments, non-profits and other interested organizations critically engage street involved youth today. -- Page 8


2011 ◽  
Vol 1 (2) ◽  
pp. 35-44
Author(s):  
Hanne Nørreklit

The purpose of this article is to establish the symbolic forms that are presently used in selected mainstream management models and to assess whether the connection between leadership and individual human reality would be improved if the management models were fundamentally inspired by those used by a successful manager and artist.The theoretical starting point of this article is Cassirer’s (Cassirer 1999) philosophy of symbolic forms. A symbolic form is “a way of having a life world” (own translation) (Cassirer 1999). In a symbolic form, a person discovers and unfolds an ability to build his own universe as an ideal universe which enables the person to “understand and interpret, to articulate and organize, synthesize and universalize his human experience” (Cassirer 1962: 221). Symbolic forms such as art, science, myth and religion thus have common features and structures in their basic function of creating common human existence. When the symbolic form is science, ideals of objectivity and precision in the description of phenomena and their relations dominate man’s formation of his universe. In art, man unfolds an ability to be subjective and create empathetic insight into matters and their diversity (Cassirer 1962). Where science as symbolic form conceptualizes objects, art teaches us empathetic insight. The symbolic forms of art and science perceive a phenomenon differently. For example, science will perhaps see a constellation as a trigonometric function, whereas it may be considered by art as a “Hogarthian shape of beauty” (own translation) (Cassirer 1999: 62). Like the symbolic form of art, the symbolic form of myth builds on emotional sympathy, but differs by believing in the existence of the constellation. It is used to create a natural or magical unity of life. Monotheistic religions also include ideas of striving for a sense of unity, but here the idea is to achieve a universal, ethical sense of unity in an individualized society. Thus the symbolic form of religion helps the individual to choose between right and wrong.With this in mind, we examine the use of symbolic forms embedded in selected mainstream management models. Subsequently, we study the symbolic forms embedded in the management discourse as the concept is unfolded by the successful Artistic Director of the Royal Danish Opera, Kasper Holten, when he talks about management, with a view to determining the extent to which this practice differs from the symbolic forms embedded in the mainstream management models. The analysis shows that mainstream management models are primarily rooted in the symbolic form of science, although they tend to gradually include the symbolic form of religion or the symbolic form of myth. Generally speaking, the mainstream management models tend to exercise power over the individual’s emphatic insight and autonomous reflection and thereby constrain the scope for human creativity and individuality. Distinctively, Kasper Holten’s management discourse integrates the symbolic forms of art and science. With art as the dominant symbolic form, Kasper rejects new public management’s perception about opera and the management of art while at the same time – through discourses that bind to the individuality of the network of players – forming personal and social identities which come together to realize a world of existential ideas about operas in general as well as opera in particular.The article is relevant because it provides insight into the ways in which management models, through the use of myth and science as symbolic forms, exercise influence on human existence and interaction and thereby influence the scope for human freedom and exercise of power and also because it provides insight into the features and structures concerning human existence and co-existence from which mainstream management models cut themselves off by not using art as a form of consciousness. The constructive aspect is a parallel outline of features and structures in a new management discourse which are better suited for postmodern society.


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