Thought experiments analogous to those discussed by Landau and Peierls are studied in the framework of a manifestly covariant relativistic quantum theory. It is shown that momentum and energy can be arbitrarily well defined, and that the drifts induced by measurement in the positions and times of occurrence of events remain within the (stable) spread of the wave packet in space-time. The structure of the Newton-Wigner position operator is studied in this framework, and it is shown that an analogous time (...) operator can be constructed which satisfies the canonical commutation relation with the energy E but does not commute (due to the presence of a time drift term) with the momentum p. The resulting commutation relation is used as a mathematical basis for the derivation of the Landau-Peierls relation Δt Δp≳ħ/c. (shrink)

Este artigo recorda os principais aspectos e motivações da Expedição Langsdorff, missão de reconhecimento do interior do Brasil iniciada em 1821, composta pelo cônsul russo barão Langsdorff, o pintor alemão Moritz Rugendas, Aimé-Adrien Taunay, Nicolas-Antoine Taunay, o polígrafo Hercules Florence e o especialista em mapas Néster G. Rubtsov. Busca diferenças entre esta expedição e iniciativas outras, a título de exemplo, as dos bandeirantes e jesuítas, bem como a expedição indigenista de Rondon, e propõe o aprofundamento das investiga­ções. Apresenta atributos resgatados (...) pela poesia brasileira contemporânea e elementos cons­titutivos da identidade cultural brasileira presentes na Expedição Langsdorff, os quais os auto­res sugerem ser relevantes para pesquisadores do tema e para a inserção do Brasil no contexto internacional político, diplomático e econômico nos tempos hodiernos. (shrink)

We first consider the entailment logic MC, based on meaning containment, which contains neither the Law of Excluded Middle (LEM) nor the Disjunctive Syllogism (DS). We then argue that the DS may be assumed at least on a similar basis as the assumption of the LEM, which is then justified over a finite domain or for a recursive property over an infinite domain. In the latter case, use is made of Mathematical Induction. We then show that an instance of the (...) LEM is intrumental in the proof of Cantor's Theorem, and we then argue that this is based on a more general form than can be reasonably justified. We briefly consider the impact of our approach on arithmetic and naive set theory, and compare it with intuitionist mathematics and briefly with recursive mathematics. Our "Four Basic Logical Issues" paper would provide useful background, the current paper being an application of the some of the ideas in it. (shrink)

The integration of a Responsible Research and Innovation (RRI) approach to food systems can contribute to redirect research and innovation toward the Sustainable Development Goal (SDG) 2 - Zero hunger - as well as other intertwined SDGs. Even though the scientific literature bridging RRI and food systems has grown over the past years, no critical reviews of this scholarship are currently available. This paper fills this gap by producing a critical review of the scientific literature on RRI in food systems (...) that has been published between 2017 and 2023. Our search led to a selection of 47 research articles that were analysed for this review. Our findings show that studies in this scholarship have focused on the stages of inputs/agricultural production, with a focus on digital technologies for agriculture. When analysing the motivations for applying RRI, we found that this varied from reasons that are more market-related, such as increasing technologies’ societal acceptance, to a reorientation of food systems towards the tackling of societal challenges. Concerning the conceptualization of RRI in food systems, we found that scholars relied on a widely known definition, but its interpretation varied greatly among the studies. Finally, we analysed how RRI has been applied in this literature and found that while some scholars provided examples of responsible innovation, others applied it to analyse innovation governance, and others used RRI to analyze research projects or innovations to ‘improve’ their alignment with this concept. Overall, this literature review showed that there is a need to develop more collaborative and reflexive work to unlock RRI’s potential to inform policy and practice that can foster more responsive and inclusive food systems capable of achieving SDG2. (shrink)

This paper analyzes the basic issues and concepts concerning the knowledge-centered tradition of Indian philosophical quest. As a matter of fact, the present millennium is different from all other such epochs of human history. There is a strong impression that we have failed in making use of 'information' and 'knowledge' hidden in ancient scriptures for the benefit of humanity. It is in this context that knowledge-centered tradition in the Indian philosophy can be of immense help. This kind of study can (...) properly be done in the light of the intellectual traditions of the Western thinkers along with globalization and postmodern developments. (shrink)

The Covid-19 pandemic has resulted in disruption of work and other social activities of so many people. Some were forced to stay at home and many decided to stay at home for fear of being infected with the virus. This phenomenon brought different reactions and even mental stress to many people. However, there were people who turned this kind of tragedy into creative work. This paper discusses the experiences and insights of known plant lovers in Digos City, Davao del Sur (...) Philippines. Digos City is one of the heavily affected places during the series of earthquakes that jolted Davao del Sur last year. While people are still recovering, COVID-19 added an additional burden to the residents. In this paper, we argue that their decision to focus on gardening was not only to fight boredom and to divert their attention during lockdown but this was their way of maintaining their well-being by participating in the on-going work of creation and recreation and to rise from the tragedy. We further argue that it might be good that this creative work will go beyond home gardening and beyond pots and slowly extend to creative work for environmental protection and preservation through more active engagements into reforestation activities. (shrink)

Perhaps the most remarkable feature of the works in which Ausonius of Bordeaux and Libanius of Antioch, writing within a few years of each other, recall their long and varied careers is that there is so little resemblance between them; the impressions given by these experienced and successful teachers could hardly be more disparate. The reader of Ausonius finds in his Protrepticus a familiar enough picture of the terrors of the schoolroom; his Professores offer at first sight a series of (...) bland commemorations apparently deficient in the interesting information which might be expected from such an archive. Libanius' many volumes, on the other hand, compared where appropriate with the Vitae Sophistarum of Eunapius, present a situation which is well summarised by the following sentences from Walden's work The Universities of Ancient Greece : ‘There was, among the sophists of the fourth century…little, if any, of that spirit of brotherhood… that usually exists in a community of scholars at the present day. Instead there were jealousy, spite and often unrelenting hatred’. This striking divergence between Ausonius and his Eastern counterparts is unlikely to reflect a basic difference between East and West, or between Latin- and Greek-speaking milieux; the complaints of Augustine about his problems in Africa and Rome warn against such a simple answer. When one adds the evidence provided seven centuries later by the Frenchman Peter Abelard, whose plaintive Historia Calamitatum — an account of the disasters he suffered, not those which he caused — is remarkably similar to the prickly self-justification of Libanius in its account of bitter scheming and almost military manoeuvres in the educational world, one is forced to consider whether the evidence of Ausonius is not a serious anomaly, and to seek an explanation. (shrink)

Background: Although fair distribution of healthcare services for older patients is an important challenge, qualitative research exploring clinicians’ considerations in clinical prioritisation within this field is scarce. Objectives: To explore how clinicians understand their professional role in clinical prioritisations in healthcare services for old patients. Design: A semi-structured interview-guide was employed to interview 45 clinicians working with older patients. The interviews were analysed qualitatively using hermeneutical content analysis. Participants: 20 physicians and 25 nurses working in public hospitals and nursing homes (...) in different parts of Norway. Results and interpretations: The clinicians struggle with not being able to attend to the comprehensive needs of older patients, and being unfaithful to professional ideals and expectations. There is a tendency towards lowering the standards and narrowing the role of the clinician. This is done in order to secure the vital needs of the patient, but is at the expense of good practice and holistic role modelling. Increased specialisation, advances and increase in medical interventions, economical incentives, organisational structures, and biomedical paradigms, may all contribute to a narrowing of the clinicians’ role. Conclusion: Distributing healthcare services in a fair way is generally not described as integral to the clinicians’ role in clinical prioritisations. If considerations of justice are not included in clinicians’ role, it is likely that others will shape major parts of their roles and responsibilities in clinical prioritisations. Fair distribution of healthcare services for older patients is possible only if clinicians accept responsibility in these questions. (shrink)

This paper reconsiders certain questions about Ausonius’ two incomplete works on historical themes, Fasti and Caesares, with particular attention to points raised in a recent article by R. W. Burgess. Of the Fasti we have only a few tantalizing snippets, the packaging and not the core: what did the work look like when it left Ausonius? What was its coverage? was it in verse or prose? The Caesares as we have it breaks off in mid-quatrain, at line 139: did it (...) go beyond Elagabalus? What of the evidence in Giovanni Mansionario that Ausonius treated certain imperatores from Decius to Diocletian? (shrink)

It may seem faintly absurd to claim or imply that a Vergilian cento has suffered unjustified neglect from scholars. These works—of which there are sixteen, covering a period of over three centuries within Late Antiquity—are usually treated at best with amused tolerance, and at worst with angry disdain. Though always ingenious, sometimes funny, and occasionally informative about the reception of Vergil, they are seldom admired. Even among Italian scholars, some of whom have paid much attention to centos, a recession has (...) set in since the annus mirabilis of 1981, which saw two editions of the Medea of Hosidius Geta. Proba has, deservedly, attracted more attention than most; her aims and methods as a Christian poetess were carefully and illuminatingly studied twenty years ago by Reinhard Herzog, and her interest as a female Roman aristocrat has brought her further attention, especially in recent years. The main aim of the present article is to suggest a particular context and a serious purpose for her cento. A postscript will show that it went on to enjoy considerable popularity until the end of the century, and an introductory section will discuss its date, but very briefly, since Matthews has convincingly said most of what needs to be said about a recent attempt to redate it. Proba's preface, much of it not in cento form, calls for detailed treatment from various angles—textual, literary, historical—and will be explored in a separate article. (shrink)