This book offers insight into the many identity work processes in play in the construction of yoga categories, inviting readers to consider pop culture yoga, a distinct way of understanding this complex phenomenon.

Societal evaluation of new technologies, specifically nanotechnology and genetically engineered organisms, challenges current practices of governance and science. When a governing body is confronted by a technology whose use has potential environmental risks, some form of risk analysis is typically conducted to help decision makers consider the range of possible benefits and harms posed by the technology. Environmental risk assessment is a critical component in the governance of nanotechnology and genetically engineered organisms because the uncertainties and complexities surrounding these technologies (...) pose such risk potential. However, GEOs are unique technologies, and there is widespread, international recognition that many traditional forms of ERA are not well-suited for evaluating them. Nanotechnology products are also likely to need different models of risk assessment, as there is very little information on their fate, transport, and impacts in the environment. (shrink)

Multifunctional agricultural systems seek to expand upon production-based benefits to enhance family wellbeing and animal health, reduce inputs, and improve environmental services such as biodiversity and water quality. However, in many countries a landscape-level conversion is uneven at best and stalled at worst. This is particularly true across the eastern rural landscape in the United States. We explore the role of social networks as drivers of system transformation within dairy production in the eastern United States, specifically rotational grazing as an (...) alternative management option. We hypothesize the importance of weak ties within farmer social networks as drivers of change. In Wisconsin, Pennsylvania, and New York, we conducted 53 interviews with confinement, low-intensity, and rotational grazing dairy producers as well as 35 interviews with associated network actors. Though confinement and grazier networks had similar proportions of strong and weak ties, confinement producers had more market-based weak ties, while graziers had more weak-ties to government agencies and other graziers in the region. These agency weak ties supported rotational graziers through information exchange and cost sharing, both crucial to farmers’ transitions from confinement-based production to grazing systems. While weak ties were integral to initial innovation, farmers did not maintain these relationships beyond their transition to grazing. Of equal importance, grazier weak-tie networks did not include environmental organizations, suggesting unrealized potential for more diverse networks based on environmental services. By understanding the drivers, we can identify barriers to expanding weak tie networks and emergent properties in order to create institutions and policies necessary for change. (shrink)

The heated debate over the limited impact of integrated pest management (IPM) in Central American agriculture suggests that we need to investigate the mechanisms of IPM technology generation. CATIE/MAG-IPM Nicaragua initiated a comparative study of two prototypic models with tomato farmers in the Sébaco Valley, in 1990–91. I created two ideal types from the literature: the scientist-led and farmer-led models. Each model was represented by three different communities. The study focused on the: 1) technology generation process, 2) IPM technologies and (...) farmer opinion of IPM, 3) forms of participation and empowerment by farmers and scientists, and 4) institutionalization of the two models. The investigation methodology consisted of intensive pre- and post-program interviews, participant observation, and statistical analysis of experimental insect and production variables.This paper focuses on farmer participation, empowerment, and evaluation of the two models. In the farmer-led model, farmer participation was greater than in the scientist-led model in number of farmers and farm units involved. They achieved five forms of influence, and six out of eight levels of empowerment in the farmer-led model. In the scientistled model, farmers achieved two forms of influence and two out of eight levels of empowerment. Farmer evaluations were varied and complex. In general, farmers in the scientist-led model encouraged CATIE/MAG-IPM to host more meetings and expand farmer involvement. In the farmer-led model the farmers enjoyed the biological information, new technologies, and discussion. They suggested changes for future meetings. (shrink)

The COVID-19 pandemic has exacerbated levels of stress and anxiety for P-12 teachers around the globe. The present study aims to understand teachers’ emotional experiences and feelings of burnout during the pandemic, and how individual (i.e., emotion regulation strategies) or contextual factors (e.g., school administrative support) intersect with different facets of their emotional experiences. Using a sequential explanatory mixed methods design, we collected and examined survey and interview data from teachers in the southeastern United States. The structural equation model confirmed (...) the relationships among the following latent variables: negative emotion, emotion regulation, autonomy support, burnout, and teacher enthusiasm. Qualitative findings provide further insight in the contextualized nature of these relationships and how they play out across various schools and districts. (shrink)

The Cambridge Handbook of the Global Work-Family Interface is a response to growing interest in understanding how people manage their work and family lives across the globe. Given global and regional differences in cultural values, economies, and policies and practices, research on work-family management is not always easily transportable to different contexts. Researchers have begun to acknowledge this, conducting research in various national settings, but the literature lacks a comprehensive source that aims to synthesize the state of knowledge, theoretical progression, (...) and identification of the most compelling future research ideas within field. The Cambridge Handbook of the Global Work-Family Interface aims to fill this gap by providing a single source where readers can find not only information about the general state of global work-family research, but also comprehensive reviews of region-specific research. It will be of value to researchers, graduate students, and practitioners of applied and organizational psychology, management, and family studies. (shrink)

Moral stress is an increasingly significant concept in business ethics and the workplace environment. This study compares the impact of moral stress with other job stressors on three important employee variables—fatigue, job satisfaction, and turnover intentions—by utilizing survey data from 305 customer-contact employees of a financial institution’s call center. Statistical analysis on the interaction of moral stress and the three employee variables was performed while controlling for other types of job stress as well as demographic variables. The results reveal that (...) even after including the control variables in the statistical models, moral stress remains a statistically significant predictor of increased employee fatigue, decreased job satisfaction, and increased turnover intentions. Implications for future research and for organizations are discussed. (shrink)

Background: Treating medication-refractory freezing of gait in Parkinson’s disease remains challenging despite several trials reporting improvements in motor symptoms using subthalamic nucleus or globus pallidus internus deep brain stimulation. Pedunculopontine nucleus region DBS has been used for medication-refractory FoG, with mixed findings. FoG, as a paroxysmal phenomenon, provides an ideal framework for the possibility of closed-loop DBS.Methods: In this clinical trial, five subjects with medication-refractory FoG underwent bilateral GPi DBS implantation to address levodopa-responsive PD symptoms with open-loop stimulation. Additionally, PPN (...) DBS leads were implanted for CL-DBS to treat FoG. The primary outcome of the study was a 40% improvement in medication-refractory FoG in 60% of subjects at 6 months when “on” PPN CL-DBS. Secondary outcomes included device feasibility to gauge the recruitment potential of this four-lead DBS approach for a potentially larger clinical trial. Safety was judged based on adverse events and explantation rate.Findings: The feasibility of this approach was demonstrated as we recruited five subjects with both “on” and “off” medication freezing. The safety for this population of patients receiving four DBS leads was suboptimal and associated with a high explantation rate of 40%. The primary clinical outcome in three of the five subjects was achieved at 6 months. However, the group analysis of the primary clinical outcome did not reveal any benefit.Interpretation: This study of a human PPN CL-DBS trial in medication-refractory FoG showed feasibility in recruitment, suboptimal safety, and a heterogeneous clinical effect in FoG outcomes. (shrink)

One of the fundamental roles of memory organisations is to safe-keep collections and this includes activities around their preservation and conservation. Conservators produce documentation records of their work to assist future interpretation of objects and to explain decision making for conservation. This documentation may exist as structured data or free text and in both cases they require vocabularies that can be understood widely in the domain. This paper describes a survey of conservation professionals which allowed us to compile the vocabularies (...) used in the domain. It includes an analysis of the vocabularies with key findings: a) the overlapping terms with multiple definitions, b) the partial coverage of the domain which is lacking controlled vocabularies for condition types and treatment techniques and c) the limited formats in which vocabularies are published, making them difficult to use within Linked Data implementations. The paper then describes an approach to improve the vocabulary landscape in conservation by providing guidelines for encoding and aligning vocabularies as well as considering third party platforms for sharing vocabularies in a sustainable way. The paper concludes with a summary of our findings and recommendations. (shrink)

Compiled by an archaeologist and philosopher of science, Science at the Frontiers: Perspectives on the History and Philosophy of Science supplements current literature in the history and philosophy of science with essays approaching the traditional problems of the field from new perspectives and highlighting disciplines usually overlooked by the canon. William H. Krieger brings together scientists from a number of disciplines to answer these questions and more in a volume appropriate for both students and academics in the field.

Port-wine birthmarks (PWBs) are caused by somatic, mosaic mutations in the G protein guanine nucleotide binding protein alpha subunit q (GNAQ) and are characterized by the formation of dilated, dysfunctional blood vessels in the dermis, eyes, and/or brain. Cutaneous PWBs can be treated by current dermatologic therapy, like laser intervention, to lighten the lesions and diminish nodules that occur in the lesion. Involvement of the eyes and/or brain can result in serious complications and this variation is termed Sturge-Weber syndrome (SWS). (...) Some of the biggest hurdles preventing development of new therapeutics are unanswered questions regarding disease biology and lack of models for drug screening. In this review, we discuss the current understanding of GNAQ signaling, the standard of care for patients, overlap with other GNAQ-associated or phenotypically similar diseases, as well as deficiencies in current in vivo and in vitro vascular malformation models. (shrink)

We present the results of three experiments investigating the interpretation of comparative constructions involving pronominal reference in which binding Principle C is violated. We show that both children and adults retrieve interpretations that are not predicted. On the one hand, children appear to represent elided pronominal material functionally instead of in a strict identity relation with a pronoun on the surface, generating interpretations that are entirely unexpected from the perspective of the adult grammar. On the other, adult participants often appear (...) to ignore Principle C, being influenced by factors such as prosodic focus, the type of comparative, and structural position of the pronoun. We propose that the way in which the sentence processor is deployed in the incremental processing of such comparative constructions gives rise to so-called acceptable ungrammaticality. (shrink)

Bayle est souvent considéré comme sceptique, mais sa conception de la raison n’est pas toujours claire ; ce qui en revanche est clair, c’est qu’il manifeste une profonde méfiance à l’égard des capacités de la raison de livrer une connaissance certaine. Cependant, une nouvelle interprétation de Bayle comme rationaliste « stratonicien » a été développée par Gianluca Mori, qui donne une description détaillée de Bayle comme philosophe critique désireux de rendre compte de toutes positions possibles dans leur complexité et de (...) tirer toutes les conséquences des arguments invoqués au service des principes dits « stratoniciens ». Cette conception de Bayle comme rationaliste critique stratonicien rend possible une interprétation de Bayle moins comme un « supersceptique » à la Richard Popkin, que celui qui permet à la raison d’opérer avec une portée et une autorité plus grandes que ne le permettrait le scepticisme. Mori affirme que la conception de la raison chez Bayle est assez forte ; selon lui, la raison peut aller jusqu’au bout, avec une autorité absolue, et tirer des conclusions. Je soutiens que la conception de la nature et de la fonction de la raison chez Bayle se situe en fait entre le rationalisme stratonicien de Mori et l’interprétation « supersceptique » de Popkin. Comme Mori, je pense qu’il s’agit d’un rationalisme « critique » ; mais contre lui, je pense que la raison elle-même définit et recommande ses propres limites. J’appelle cette conception de la raison « sceptico-rationaliste » et, en suivant Bayle, je suggère comment le « bon sens » (qui fait partie de la raison) aide à définir ces limites. (shrink)

In English, deictic verbs of motion, such ascomecan encode the perspective of the speaker, or another individual, such as the addressee or a narrative protagonist, at a salient reference time and location, in the form of an indexical presupposition. By contrast, Spanish has been claimed to have stricter requirements on licensing conditions forvenir(“to come”), only allowing speaker perspective. An open question is how a bilingual learner acquiring both English and Spanish reconciles these diverging language-specific restrictions. We face this question head (...) on by investigating narrative productions of young Spanish-English bilingual heritage speakers of Spanish, in comparison to English monolingual and Spanish dominant adults and children. We find that the young heritage speakers producevenirin linguistic contexts where most Spanish adult speakersdo not, but where English monolingual speakersdo, and also resemble those of young monolingual Spanish speakers of at least one other Spanish dialect, leading us to generate two mutually-exclusive hypotheses: (a) the encoding of speaker perspective in the young heritage children is cross-linguistically influenced by the more flexible and dominant language (English), resulting in a wider range of productions by these malleable young speakers than the Spanish grammar actually allows, or (b) the young Spanish speakers are exhibiting productions that are in fact licensed in the grammar, but which are pruned away in the adult productions, being supplanted by other forms as the lexicon is enriched. Given independent evidence of the heritage speakers' robust Spanish linguistic competence, we turn to systematically-collected acceptability judgments of three dialectal varieties of monolingual adult Spanish speakers of the distribution of perspective-taking verbs, to assess their competence and adjudicate between (a) and (b). We find that adultsaccept venirin contexts in which they do notproduceit, leading us to argue that (a)venirisnotobligatorily speaker-oriented in Spanish, as has been claimed, (b) adults may not producevenirin these contexts because they instead select more specific motion verbs, and (c) for heritage bilingual children, the more dominant language (English) may support the grammatically licensed but lexically-constrained productions in Spanish. (shrink)

BackgroundUnderstanding sex and gender in health research can improve the quality of scholarship and enhance health outcomes. Funding agencies and academic journals are two key gatekeepers of knowledge production and dissemination, including whether and how sex/gender is incorporated into health research. Though attention has been paid to key issues and practices in accounting for sex/gender in health funding agencies and academic journals, to date, there has been no systematic analysis documenting whether and how agencies and journals require attention to sex/gender, (...) what conceptual explanations and practical guidance are given for such inclusion, and whether existing practices reflect the reality that sex/gender cannot be separated from other axes of inequality.MethodsOur research systematically examines official statements about sex/gender inclusion from 45 national-level funding agencies that fund health research across 36 countries (covering the regions of the EU and associated countries, North America, and Australia) and from ten top-ranking general health (the top five in “science” and the top five in “social science”) and ten sex- and/or gender-related health journals. We explore the extent to which agencies and journals require inclusion of sex/gender considerations and to what extent existing strategies reflect state of the art understandings of sex/gender, including intersectional perspectives.ResultsThe research highlights the following: (a) there is no consistency in whether sex/gender are mentioned in funding and publishing guidelines; (b) there is wide variation in how sex/gender are conceptualized and how researchers are asked to address the inclusion/exclusion of sex/gender in research; (c) funding agencies tend to prioritize male/female equality in research teams and funding outcomes over considerations of sex/gender in research content and knowledge production; and (d) with very few exceptions, agency and journal criteria fail to recognize the complexity of sex/gender, including the intersection of sex/gender with other key factors that shape health.ConclusionsThe conceptualization and integration of sex/gender needs to better capture the interacting and complex factors that shape health—an imperative that can be informed by an intersectional approach. This can strengthen current efforts to advance scientific excellence in the production and reporting of research. We provide recommendations and supporting questions to strengthen consideration of sex/gender in policies and practices of health journals and funding agencies. (shrink)

The opioid epidemic has claimed the lives of more than 183,000 individuals since 1999 and is now the leading cause of accidental death in the United States. Meanwhile, rates of incarceration have quadrupled in recent decades, and drug use is the leading cause of incarceration. Medication-assisted treatment or MAT is the gold standard for treatment of opioid use disorder. Incarcerated individuals with opioid use disorder treated with methadone or buprenorphine have a lower risk of overdose, lower rates of hepatitis C (...) transmission, and lower rates of re-incarceration. Despite evidence of improved outcomes, many jails and prisons do not offer MAT to individuals with opioid use disorder. This seems partly due to a scientifically unjustified preference for an abstinence-only treatment approach. The absence of MAT in prisons and jails results in poor outcomes for individuals and poses a public health threat to communities. Furthermore, it disproportionately harms poor communities and communities of color. Health care providers in prisons and jails have an ethical obligation to offer MAT to individuals with opioid use disorder to mitigate risk of infectious diseases, opioid overdose and health disparities associated with incarceration. (shrink)

Abstrak: Untuk mengembangkan suatu teologi ekologi, yang dikenal sebagai ekoteologi, mesti didasarkan pada fakta mengenai keterhubungan semua ciptaan sebagai suatu ekosistem. Metodologinya adalah induktif dan interdisipliner. Kosmologi dan antropologi amat membantu memberikan data ilmiah. Data-data tersebut merupakan titik awal untuk melakukan teologi ekologi, selain sumber-sumber yang diperoleh dari Wahyu, seperti Kitab Suci, Tradisi dan Magisterium. Artikel ini merupakan suatu upaya mengembangkan teologi ekologi berdasarkan tradisi teologi Kristiani yang menggaris bawahi sejumlah titik pandang teologis, seperti penciptaan sebagai suatu proses melalui itu (...) Allah menciptakan dunia; peran khas manusia sebagai partner Allah Pencipta, selaku gambar dan rupa Allah, merawat dan memelihara ciptaan atas nama Allah; antroposentrisme tidak memiliki akar dalam teologi ekologi Kristiani. Mistisisme kosmik St. Fransiskus sebagaimana diajukan Paus Fransiskus dalam ensiklik Laudato Si’ akan menjadi bagian kedua dari artikel ini, agar dapat memahami spiritualitas ekologis yang meresap dalam seluruh ensiklik. Bagi orang-orang Kristen memelihara ciptaan merupakan suatu kewajiban yang berakar dalam iman Kristiani. Kata-kata Kunci: Teologi ekologi, ekosistem, penciptaan sebagai proses, Teosentrisme, antroposentrisme, gambar dan rupa Allah, mistisisme, penyair ontologis. Abstract: A theology on ecology, known as eco-theology, should be based on the reality of the interconnection of all creations as an ecosystem. The methodology should be both inductive and inter-disciplinary. Cosmology, biology and anthropology are helpful in contributing scientific data. The given data could be the starting points in doing a theology of ecology, besides the resources from Revelation, such as Scriptures, Tradition and Magisterium. This article is an effort to elaborate a theology of ecology based on Christian Tradition of Theology which underlines several theological points of view such as: creation as a process through which God creates the world; a special role as co-partner of the Creator for human being as “imago Dei” has to conserve and to take care of creation as God’s representative; anthropocentrism has no root on Christian theology of ecology. The Cosmic mysticism of St. Francis, promoted by Pope Francis in his encyclical letter Laudato Si’, occupies the second part of this article in order to understand ecological spirituality which emerges throughout the encyclical letter. For Christians, taking care of creation is also an imperative rooted in their Christian faith. Keywords: Theology of ecology, ecosystem, creation as a process, Theocentrism, anthropocentrism, imago Dei, cosmic mysticism, ontological poet. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Reviewed by:Buddhist Inclusivism: Attitudes Towards Religious OthersTerry C. MuckBuddhist Inclusivism: Attitudes Towards Religious Others. By Kristin Beise Kiblinger. Hants, England: Ashgate, 2005. 145 pp.Kristen Beise Kiblinger, who teaches in the religion department at Thiel College, has written a provocative and imaginative book. It is provocative in that [End Page 168] she appears to be doing buddhology even though she resists calling it that. She says she doesn't want (...) to take the voice of a buddhologian. She does not describe what is as a phenomenologist might or what was as an historian of religion might, or what should be as a buddhologian might. She describes what might be, as a—well, as a participant-philosopher might. She writes as an outsider taking the voice of an insider.Kiblinger chooses as her topic the relationship of Buddhists to people of other religions. She begins by noting that Buddhists themselves have not explicitly addressed this topic in their religious philosophizing, at least not to the extent Christians have. But, she suggests, implicitly they behave as if they do have a favored response to this issue. Citing a wide variety of Buddhist sources across the Buddhist spectrum, she concludes that inclusivism is the most natural position for Buddhists to take vis-à-vis the other religions. She describes that position in some detail, all the while persisting in her refusal to be considered a spokesperson in the insider sense.Kiblinger draws her examples from the way two historical figures related to people of non-Buddhist ideologies and from historical contacts Buddhism as a movement had with other religions or sects. The first historical figure is Siddhartha Gautama himself. The Buddha, Kiblinger notes, was not shy about identifying what made any religion (not just his dhamma) useful—the noble eightfold path. This path is the core of Gautama's dhamma, but it also appears in other religions in other forms. The Buddha put forth the presence of this content as the measure of a religion's usefulness (see the Mahaparinibbana Sutta). And of course the parable of the raft relativizes all religious teachings, making them true only to the extent that they enable humans to "cross the stream" of temporal existence, a common tenet of the inclusivist position in all its forms.Asoka represents a second example of Buddhist inclusivism for Kiblinger. In the seventh and twelfth of his Rock Edicts, Asoka makes clear that all members of all religious traditions are welcome to practice in his kingdom, even though he thinks Buddhism is the best position. He makes clear that both exclusivism and intolerance of other religious ideas are not acceptable positions in his way of looking at the spiritual dimension of the world. Existentially, Asoka's life story is a model of a reformed "exclusivist" finally embracing the all-truth-no-matter-where-you-find-it-is-still-truth position.Not just these giant figures model inclusivism. Buddhism as a movement has consistently, Kiblinger argues, behaved toward other movements as inclusivists would. She uses as a first example the Buddhist attitude toward Vedic sacrifice, the religious practice most liable to be cast aside by the new teaching of Gautama. We see in this example, Kiblinger says, "the technique of significant reinterpretation and new application rather than subordination" (p. 41). She also notes that a technique she calls "reinterpretation by ethicization" that does not throw out Vedic teaching altogether but claims at its root a teaching that was originally Buddhist.Evidence for the inclusivist position can also be found in the way Mahayanists treated Theravadins, or Hinayanists as Kiblinger refers to them. Scholars of Buddhism [End Page 169] have for the most part recognized that the term "hinayana," perhaps best translated as "lesser vehicle," is a pejorative term given to Theravadins by the Mahayanists, the "great vehicle" folks. Kiblinger argues that even though Mahayanists consider their tradition superior (a common trait of all inclusivists, Buddhist or not), they do so with an openness to the value of the way Theravadins approach the problem of enlightenment. Their way may not be the best, but it is a way, and in some contexts it may be an effective way. Mahayanists are able... (shrink)

C. S. Lewis' article addresses a critically important issue on which Howard Ahmanson comments. Professor Oliver O'Donovan addresses the same issue in a sermon in Christ Church Oxford on Trinity Sunday 1997. We publish the three articles together in the year of the fiftieth anniversary of the independence of India and Pakistan and invite correspondence on the issues at stake. Eds.

The Battle of Drepana in 249 b.c. marks the most significant defeat of Roman naval forces at the hands of their Carthaginian opponents during the First Punic War. Attempting to take the Punic fleet in the harbour of Drepana by surprise, the consul P. Claudius Pulcher sailed with his ships from Lilybaeum about midnight, and reached Drepana at dawn. Yet, owing to swift and level-headed counter-measures taken by the Punic commander, Adherbal, the unfolding fight – partly in the harbour, mostly (...) off the shore – turned into a fiasco for the Romans. The consul got away; he returned to Rome, where the Senate instructed him to appoint a dictator. How soon he returned, and by what route, is the question. (shrink)

A critical and detailed introduction to Kant's philosophy, with particular reference to the Critique of Pure Reason. Since Broad's death there have been many publications on Kant but Broad's 1978 book still finds a definite place between the very general surveys and the more specialised commentaries. He offers a characteristically clear, judicious and direct account of Kant's work; his criticisms are acute and sympathetic, reminding us forcefully that 'Kant's mistakes are usually more important than other people's correctitudes'. C.D. Broad was (...) Knightsbridge Professor of Moral Philosophy at Cambridge from 1933 to 1953, and this book is based on his undergraduate lectures on Kant. Broad died in 1971 and Dr Lewy has since edited the book for publication. (shrink)

This essay argues that retrieving insights from the ancient Stoic philosophers for Christian ethics is much more difficult than is often assumed and, further, that the "ethics of retrieval" is itself something worth prolonged reflection. The central problem is that in their ancient sense both Christianity and Stoicism are practically dense patterns of reasoning and mutually incompatible forms of life. Coming to see this clearly requires the realization that the encounter between Stoicism and Christianity is a conflict of lived traditions. (...) Precisely because we cannot simply extract Stoic insights from the lives in which they belong, the task of determining how Stoicism is useful for Christianity is exceptionally challenging. Indeed, doing justice to the Stoics has more to do with facing an alternative to Christianity than it does with appropriating insights for our own use. These points are developed in conversation with Elizabeth Agnew Cochran's recent article on the Stoic influence upon Jonathan Edwards. This essay is a response to C. Kavin Rowe's critique of my 2011 argument that certain dimensions of Roman Stoic ethics are at work in Jonathan Edwards's moral thought. Rowe raises questions about the act of selectively retrieving ideas from a philosophical tradition to support constructive work in another tradition. I argue for the importance of acknowledging how Christian thought has been shaped by what Jeffrey Stout describes as moral bricolage, the selective retrieval of ideas from various traditions, and I contend that this bricolage can continue to be a fruitful means through which Christian ethics engages external traditions. Moreover, the importance of Stoicism's retrieval in early modern philosophy makes the work of eighteenth-century theologians such as Edwards a particularly valuable resource for exploring the plausibility of Christian engagement with the Stoics. (shrink)

A coordinate-free formulation is established for (semi) classical particle-field interactions. The exterior language of spacetime chains and De-Rham currents enables the description to include extended strings and membranes besides point particles. Treating physical fields in terms of sections of particular bundles, a unified account of interactions is presented in terms of an intrinsic action principle on a bundle of jets over spacetime. The theory is illustrated by considering the specific model of point particles with intrinsic spin covariantly coupled to theU(1) (...) andSL(2, C) connections describing the electromagnetic and gravitational fields, respectively. The notion of dual spin is examined in this context and coupled equations for this particle-field system are explicitly derived in a local chart. Attention is drawn to the global implications of the theory. (shrink)

The 65th year of a scholar who has devoted 40 years to editing and elucidating Robert Grosseteste provides us with a collection of essays. Not surprisingly, they emanate from colleagues and former students of Richard Dales and reflect his interest, among other concerns, in Grosseteste's aspectus et affectus - range of vision and disposition of mind - those twin peaks with which the 13th century thinker helped to get Christian thought through Aristotle without mutual destruction.