We present a description of the Stern–Gerlach type experiments using only the concepts of classical electrodynamics and the Newton’s equations of motion. The quantization of the projections of the spin (or the projections of the magnetic dipole) is not introduced in our calculations. The main characteristic of our approach is a quantitative analysis of the motion of the magnetic atoms at the entrance of the magnetic field region. This study reveals a mechanism which modifies continuously the orientation of the magnetic (...) dipole of the atom in a very short time interval, at the entrance of the magnetic field region. The mechanism is based on the conservation of the total energy associated with a magnetic dipole which moves in a non uniform magnetic field generated by an electromagnet. A detailed quantitative comparison with the (1922) Stern–Gerlach experiment and the didactical (1967) experiment by J.R. Zacharias is presented. We conclude, contrary to the original Stern–Gerlach statement, that the classical explanations are not ruled out by the experimental data. (shrink)

La respuesta a la pregunta del título se ofrece en tres niveles. A veces las diferencias se deben a las limitaciones del equipo empleado, deficiencias en el muestreo o preferencias en la interpretación de los datos. Otras veces se deben a que los investigadores operan en base a paradigmas diferentes..

The effects of the vacuum electromagnetic fluctuations and the radiation reaction fields on the time development of a simple microscopic system are identified using a new mathematical method. This is done by studying a charged mechanical oscillator (frequency Ω 0)within the realm of stochastic electrodynamics, where the vacuum plays the role of an energy reservoir. According to our approach, which may be regarded as a simple mathematical exercise, we show how the oscillator Liouville equation is transformed into a Schrödinger-like stochastic (...) equation with a free parameter h′ with dimensions of action. The role of the physical Planck's constant h is introduced only through the zero-point vacuum electromagnetic fields. The perturbative and the exact solutions of the stochastic Schrödinger-like equation are presented for h′>0. The exact solutions for which h′<h are called sub-Heisenberg states. These nonperturbative solutions appear in the form of Gaussian, non-Heisenberg states for which the initial classical uncertainty relation takes the form 〈(δx 2)〉〈(δp) 2 〉=(h′/2) 2,which includes the limit of zero indeterminacy (h → 0). We show how the radiation reaction and the vacuum fields govern the evolution of these non-Heisenberg states in phase space, guaranteeing their decay to the stationary state with average energy hΩ 0 /2 and 〈(δx) 2 〉〈(δp) 2 〉=h 2 /4 at zero temperature. Environmental and thermal effects-are briefly discussed and the connection with similar works within the realm of quantum electrodynamics is also presented. We suggest some other applications of the classical non-Heisenberg states introduced in this paper and we also indicate experiments which might give concrete evidence of these states. (shrink)

We give an example in which it is possible to understand quantum statistics using classical concepts. This is done by studying the interaction of chargedmatter oscillators with the thermal and zeropoint electromagnetic fields characteristic of quantum electrodynamics and classical stochastic electrodynamics. Planck's formula for the spectral distribution and the elements of energy hw are interpreted without resorting to discontinuities. We also show the aspects in which our model calculation complement other derivations of blackbody radiation spectrum without quantum assumptions.

The overflow of scientific literature stimulates poor reading habits which can aggravate science's reproducibility crisis. Thus, solving the reproducibility crisis demands not only methodological changes, but also changes in our relationship with the scientific literature, especially our reading habits. Importantly, this does not mean reading more, it means reading better.

In recent years there has been a wealth of studies investigating how memories are allocated in the hippocampus. Some of those studies showed that it is possible to manipulate the identity of neurons recruited to represent a given memory without affecting the memory's behavioral expression. Those findings raised questions about how the hippocampus represents memories, with some researchers arguing that hippocampal neurons do not represent fixed stimuli. Herein, an alternative hypothesis is argued. Neurons in high‐order brain regions can be tuned (...) to multiple dimensions, forming complex, abstract representations. It is argued that such complex receptive fields allow those neurons to show some flexibility in their responses while still representing relatively fixed sets of stimuli. Moreover, it is pointed out that changes induced by artificial manipulation of cell assemblies are not completely redundant—the observed behavioral redundancy does not imply cognitive redundancy, as different, but similar, memories may induce the same behavior. (shrink)

Graphical AbstractThis paper discusses how our bad reading habits are starting to influence how we write. This short abstract and the picture next to it summarize the arguments in this paper. Just kidding, they do not. One really needs to read the paper for that.

In this introduction to the first installment of the Common Knowledge symposium on xenophilia, the editor explains the rationale of the new project, citing increases in aggressive xenophobia internationally. He comments on the intergroup-relations theorist Todd Pittinsky's argument that, since tolerance is not logically the antithesis of negative feelings toward out-groups, even long-established traditions of toleration are inadequate to prevent intergroup aggression. Pittinsky proposes that tolerance be replaced, as a principle of peacekeeping, by the encouragement of positive feelings toward out-groups, (...) and the author of this essay responds by showing how the Freudian theory of ambivalence and the history of literature on which Freud drew in constructing it support Pittinsky's viewpoint. Enemies regularly fall in love, above all in Shakespearean drama, which Freud explains by arguing that all human relations are love-hate relations. Thus, this essay suggests, it takes as much psychic energy to repress the love in what appear to be relationships of hatred as to repress the hatred in what appear to be relationships of love. There is a metaphysical component as well to this argument: the xenophobe and xenophile equally presuppose that the identity principle is applicable to society as well as to mathematics; both assume that each discrete social group is self-identical and differs from all other groups more or less radically. The main difference between –phile and –phobe is the latter's relative incapacity to live with ambivalence. Given these arguments, one must expect to find negative as well as positive motives in the etiology and conduct of xenophilia—and the first installment of the Common Knowledge symposium is said to focus on cases of xenophilia in which varieties of enmity accompany that singular and underrated variety of love. (shrink)

Bibliographic negligence, i.e. omission of citation of the relevant work of other researchers, is possibly the most common type of research misconduct, leading to unfair loss of priority of authorship and undermining the reward system of science. We report a case of bibliographic negligence which we recently suffered from a leading biomedical journal. The case is discussed in the context of the editorial policy of the journal and of relevant ethical guidelines. Scientific journals should develop codes of conduct for citations. (...) In addition, the implications and consequences of bibliographic negligence deserve thorough investigation. (shrink)

The effects of the vacuum electromagnetic fluctuations and the radiation reaction fields on the time development of a simple microscopic system are identified using a new mathematical method. This is done by studying a charged mechanical oscillator (frequency Ω 0)within the realm of stochastic electrodynamics, where the vacuum plays the role of an energy reservoir. According to our approach, which may be regarded as a simple mathematical exercise, we show how the oscillator Liouville equation is transformed into a Schrödinger-like stochastic (...) equation with a free parameter h′ with dimensions of action. The role of the physical Planck's constant h is introduced only through the zero-point vacuum electromagnetic fields. The perturbative and the exact solutions of the stochastic Schrödinger-like equation are presented for h′>0. The exact solutions for which h′shrink)

We make a brief review of the Kramers escape rate theory for the probabilistic motion of a particle in a potential well U(x), and under the influence of classical fluctuation forces. The Kramers theory is extended in order to take into account the action of the thermal and zero-point random electromagnetic fields on a charged particle. The result is physically relevant because we get a non-null escape rate over the potential barrier at low temperatures (T → 0). It is found (...) that, even if the mean energy is much smaller than the barrier height, the classical particle can escape from the potential well due to the action of the zero-point fluctuating fields. These stochastic effects can be used to give a classical interpretation to some quantum tunneling phenomena. Relevant experimental data are used to illustrate the theoretical results. (shrink)

We consider the simple case of a nonrelativistic charged harmonic oscillator in one dimension, to investigate how to take into account the radiation reaction and vacuum fluctuation forces within the Schrödinger equation. The effects of both zero-point and thermal classical electromagnetic vacuum fields, characteristic of stochastic electrodynamics, are separately considered. Our study confirms that the zero-point electromagnetic fluctuations are dynamically related to the momentum operator p=−i ℏ ∂/∂ x used in the Schrödinger equation.

The development and use of advanced and innovative neuroscience, neurotechnology and some forms of artificial intelligence have exposed potential threats to the human condition, including human rights. As a result, reconceptualizing or creating human rights (i.e. neurorights) has been proposed to address specific brain and mind issues like free will, personal identity and cognitive liberty. However, perceptions, interpretations and meanings of these issues—and of neurorights—may vary between countries, contexts and cultures, all relevant for an international-consensus definition and implementation of neurorights. (...) Thus, we encourage reflecting on the proactive inclusion of transnational, cross-cultural and contextual considerations and concerns to contribute to the global discourse. This inclusion does not mean endorsing ethical relativism but rather a call to foster a universal understanding of key concepts and concerns. Including contextual and cultural perspectives may truly anticipate global concerns which could be addressed while developing and implementing neurorights. Consequently, any ethical and/or legal regulatory framework(s) for the translational and transnational use of advanced neuroscience, neurotechnology and some forms of artificial intelligence intended to protect and safeguard human dignity should be contextually and culturally mindful, responsible, respectful and inclusive of not only human rights and fundamental freedoms but also of neurocognitive cultural diversity. (shrink)

There is growing interest in tissue procurement for cancer research through autopsy. Establishing an autopsy/tissue donation programme for breast cancer research within an academic medical centre i...

Caracterización de un grupo de comités de ética en investigación en Colombia Caracterização de um grupo de comitês de ética em pesquisa na Colômbia In the last decades, controlled clinical trials sponsored by the pharmaceutical industry have increased considerably. This has led to the need for greater control and assistance by regulators and ethics committees to ensure appropriate compliance with established ethical standards and good clinical practices in general. In Colombia, the National Food and Drug Surveillance Institute, the regulator in (...) the country, controls and monitors the operation of clinical research with drugs. In 2008, this entity issued Resolution 2378, which provides and regulates research actors in Colombia, including ethics committees. After being in force for several years, it is necessary to know whether research ethics committees in Colombia operate in accordance with this regulation and to determine the status of implementation of the requirements therein. For this purpose, a survey was designed to be voluntarily answered and a response was obtained from 25 of the 69 certified committees in Colombia. Twenty-two of them could be analyzed because their information was complete. Compared with previous studies, favorable changes in development and organization were observed in accordance with the current proposed regulation. Para citar este artículo / To reference this article / Para citar este artigo Suárez-Obando F, Reynales H, Urina M, Camacho J, Viteri M. Caracterización de un grupo de comités de ética en investigación en Colombia. pers. bioét. 2018; 22: 303-318. DOI: 10.5294/pebi.2018.22.2.8. (shrink)

The book, volume 42 in the Boston Studies in the Philosophy of Science, consists principally of two interconnected essays in theoretical biology. The first, entitled "Biology of Cognition," was written in 1969 by Humberto R. Maturana, a Chilean neurophysiologist and anatomist whose earlier work included studies of vision in birds and the frog. The second essay, "Autopoiesis: the Organization of the Living," is an expansion of certain sections in the first and was written in 1972 by Maturana and Francisco (...) J. Varela, a philosophical biologist. Although Maturana alone is responsible for the introduction, the two essays are said to represent one point of view, expressed in the concept of "autopoiesis." The term, "a word without a history," was invented to convey "the central feature of the organization of the living, which is autonomy". Autopoiesis, it is claimed, enables us to say at once, through the logic of a self-referring homeostatic system, what is organic life and cognition. "Living systems are cognitive systems, and living as a process is a process of cognition". (shrink)

ABSTRACTThis article reviews Humberto Llavador, John Roemer, and Joaquim Silvistre’s 2015 book on the economics of climate change, Sustainability for a Warming Planet. While the book is written for economists, its arguments should be of interest to environmental philosophers and interdisciplinary scholars of climate change. After summarizing the book’s chapters, I offer modest criticisms and a brief commentary on the scope and limits of economic modeling of climate change decisions.

Manuel Moyano y Humberto M. Trujillo Dept. de Educación, Universidad de Córdoba, España Dept. de Metodología … Read More →.

Today humanity faces radical global climate change, mass species extinctions, and unprecedented transformations to both terrestrial and aquatic ecosystems across the globe. Environmental ethics is an academic subfield of philosophy concerned with normative and evaluative propositions about the world of nature and, perhaps more generally, the moral fabric of relations between human beings and the world we occupy. This Handbook contains 45 newly commissioned essays written by leading experts and emerging voices and represent some of the best and most contemporary (...) thinking in environmental ethics. The chapters range over a broad variety of issues, concepts, and perspectives that are both central to and characteristic of the field, thus providing an authoritative but accessible account of the history, analysis, and prospect of ideas that are essential to contemporary environmental ethics. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:René Girard and the Rhetoric of ConsumptionKathleen M. Vandenberg (bio)The work of René Girard, so productively applied in so many different fields—in theology, in anthropology, in literature, to name a few—has yet to be recognized or applied in the field of rhetorical studies. Yet there exists, I argue, a need precisely for Girard's theories as the over 2000 year-old discipline enters the twenty-first century.Girard's theory of mimetic or triangular (...) desire can be used as a model for understanding persuasion, because it is, among other things, an "expression of a basic set of ideas on... the dynamics of the self and human relations" (1996, vii). Girard's concern is with human relationships and, in a sense, with how individuals in these relationships act rhetorically upon themselves and others. Girard's mimetic theory hinges on the dynamics of imitation and explains how individuals relate through both the conscious and the unconscious sharing of behaviors, attitudes, and beliefs in certain situations. These situations are clearly rhetorical, as can be seen by examining the definition of the "rhetorical situation" set forth by Lloyd Bitzer, in his seminal 1968 article, "The Rhetorical Situation." Bitzer proposes three conditions that must be met for a rhetorical situation to exist: an exigency or imperfection marked by urgency; a rhetorical audience or an audience that can act; and constraints, or elements that have the power to constrain the decision and action needed to modify the exigency (7). In mass-mediated modern rhetoric, I argue that the exigencies exist externally (in the culture) and internally, the audience is both others and self, and the constraints are the alienation, mystification, and desire generated by hierarchies. Twentieth-century rhetorical theorist Kenneth Burke advises that "we must often think of rhetoric not in terms of some one particular address, but as a general body of identifications that owe their convincingness much more to trivial repetition and dull daily reënforcement than to exceptional rhetorical skill" (1950, 26). Such is the case with this particular form of rhetoric, which is generated and propagated by mimetic contagion and thus is best more narrowly defined as sociological propaganda, a type of propaganda [End Page 259] theorized by Jacques Ellul in Propaganda: The Formation of Men's Attitudes (1975).Ellul, the first to distinguish between political propaganda and sociological propaganda, proposes that the latter encompasses social behaviors "much more vast and less certain" than those of political propaganda (1975, 62). These social behaviors permit the penetration of an ideology in a society, a penetration that is achieved through the active participation of the masses. Sociological propaganda, as Ellul describes it, works from within; it is dependent on the individual's willingness and ability to persuade him- or herself and others. Sociological propaganda, Ellul posits, is created when members of a group behave in such a way as to influence the attitudes, actions, and lifestyles of others; often this behavior is unconscious, unintentional, and spontaneous.In these ways, the rhetoric of sociological propaganda operates in a markedly different fashion than more "traditional" rhetoric, which is largely understood to operate as a unilateral transaction in which an individual orator actively, openly, and orally works to move a relatively passive but physically present audience to act in accordance with the orator's own beliefs through a formally delivered speech. In its reliance on the interaction and cooperation of the many rather than the centrality and dominance of one speaker, in its acceptance of unintentional, spontaneous, and unconscious persuasion, in its dependence on the modern mass media, and in the limitless and nebulous nature of its boundaries in time and space, sociological propaganda constitutes a type of rhetoric heretofore insufficiently addressed by rhetorical studies. Although existing perspectives in rhetorical criticism have certainly addressed some aspects of this rhetoric, sociological propaganda is not easily explained with the terminology of traditional rhetorical criticism or easily approached from traditional rhetorical perspectives.This article asserts that the best way to approach and understand such propaganda is through the perspective of René Girard. Approaching this propaganda from a Girardian perspective permits us to look beyond the symbols of sociological propaganda and analyze our own responsibility in rhetorical... (shrink)

In Subjects That Matter, Namita Goswami attends to philosophy’s institutional and disciplinary failures to reconcile its identitarian claims to universality and reason with the feminist and postcolonial modes of thinking it traditionally keeps at bay. This essay places Goswami’s critique within a context of “the thought from outside,” which, beginning with Foucault’s reading of Blanchot, continuing through the geopolitics of Dussel’s philosophy of liberation, and prominent in Catherine Malabou’s conceptualization of plasticity, demonstrates how political critiques of philosophical hegemony contain an (...) implicit theorization of “literature.” If “literature” gives voice to the thought from outside, does it in turn “decolonize” philosophy? If so, what itinerary of thought ought to follow the relationship between this literary decolonization of philosophy and its imbrication within the fold of philosophical thought? How to conceptualize the plastic relation between inside and outside, between center and periphery, without subordinating the latter to the hegemony of the former? This essay argues for a coherence between Goswami’s and Malabou’s materialist understandings of difference and a conceptualization of literature as an “outside” to philosophy that operates “excentrically” “inside” philosophy. (shrink)

The use of platelet rich plasma as a novel treatment is discussed in the context of a qualitative research study comprising 38 interviews with sports medicine practitioners and other stakeholders working within the English Premier League during the 2013–16 seasons. Analysis of the data produced several overarching themes: conservatism versus experimentalism in medical attitudes; therapy perspectives divergence; conflicting versions of appropriate evidence; subcultures; community beliefs/practices; and negotiation of medical decision-making. The contested evidence base for the efficacy of PRP is presented (...) in the context of a broader professional shift towards evidence based medicine within sports medicine. Many of the participants while accepting this shift are still committed to casuistic practices where clinical judgment is flexible and does not recognize a context-free hierarchy of evidentiary standards to ethically justifiable practice. We also discuss a tendency in the data collected to consider the use of deceptive, placebo-like, practices among the clinician participants that challenge dominant understandings of informed consent in medical ethics. We conclude that the complex relation between evidence and ethics requires greater critical scrutiny for this emerging specialism within the medical community. (shrink)

ÖZ “Tanzanya’da Leibzig Misyoner Cemiyeti Misyonerliği, Karşılaşılan Zorluklar ve Kullanılan Yöntemler” isimli makale “Tanzanya’da Misyonerlik Faaliyetler Lutheran Kilise Örneği” isimli yüksek lisans tezine dayanmaktadır. Makale, Lutheran misyonerliğinin Tanzanya’da faaliyetlerine nasıl başladıkları, ilerleme yöntemleri ve karşılaşılan güçlükleri anlama noktasında önem arz etmektedir. Makalede ana konuya odaklanmadan önce, Tanzanya hakkında genel bir bilgilendirme yapılmış, ardından Leibzig Misyon Cemiyeti’nin (LMS) faaliyetlerine nasıl başladığı, kronolojik bir şekilde açmış olduğu istasyonlar, bu istasyonlarda karşılaşmış olduğu zorluklar ve kullanılan yöntemler hakkında bilgi verilmiştir. Ayrıca, Tanzanya’da Lutheran misyoner (...) cemiyetlerinin, Tanzanya Evanjelik Lutheran Kilisesi (Tanzania Evangelical Lutheran Church in Tanzania) ELCT ile tek bir kilise çatı altında toplanması ele alınmıştır. Son olarak, ELCT’nin kabul etmiş olduğu ilkeler ve Martin Luther’in öğretilerinin Afrika’daki yansımaları üzerinde durulmuştur. Makale, sadece misyonerleri ve misyonerlik faaliyetlerini değil, ayrıca muhatap olunan ve yüzyıllardır sömürgeleştirilen Afrika halkını anlamamıza da yardımcı olmaktadır. Araştırma, Lutheran misyonerliğinin Tanzanya’da başlamış olduğu 19. yüzyıl sonu ve yoğunlaştığı 20. yüzyıl ile sınırlandırılmıştır. Otto von Bismarck’ın (1815-1898) katkılarıyla gerçekleşen Berlin Konferansı sayesinde, batılı ülkelerin bayrakları ile haçları da sömürge topraklarına girmiştir. Tanzanya'da Lutheran Misyon, Johann Ludwig Krapf (1810-1881) ve Johannes Rebmann'ın (1820-1876) CMS tarafından görevlendirilmeleri sonucu başlamıştır. LMS, CMS'den 1892 tarihinde görevi devralmıştır ve Machame, Mamba, Old Moshi, Pare, Meru'da faaliyet göstermiştir. Misyon faaliyetleri süresince, savaşlar, kıtlık ve salgın, çok eşlilik, sünnet uygulaması, tanrı anlayışı gibi birçok zorlukla karşılaşılmıştır. Zorluklar, onları ortadan kaldırmaya yardımcı olacak; eğitim, sağlık, bütüncül hizmet, ortak dil (lingua franca), Kutsal Kitap çevirileri, ev ziyaretleri, yerli yardımcılar ve yerlileştirme gibi yöntemleri de beraberinde getirmiştir. Tanzanya’da LMS dışında; Katolik Kutsal Ruh Babaları (Holy Ghost Father/ Spiritanlar), Katolik Beyaz Babalar (Peres Blancs), Katolik Benediktinler, Anglikan Kilise Misyon Topluluğu (Chuch Missionary Society) CMS, Anglikan Üniversitelerin Orta Afrika Misyonu (The Universities’ Mission to Central Africa) UMCA gibi misyon grupları mevcuttur. Tanzanya'da bulunan Lutheran Misyon toplulukları, Evanjelik Lüteriyen Kilisesi (ELCT) adı altında 1963 yılında tek bir çatı altında toplanmıştır. ELCT bugün 5,2 milyon üyesi ile Tanzanya nüfusu içinde hatırı sayılır bir yere sahiptir. Bu çalışmada, deskriptif yöntem kullanılmıştır. Ulaşılabilen tüm ilk kaynaklara inilerek Lutheran misyonerler ve Tanzanya hakkında bilgi verilmiştir. Çalışmada Türkçe kaynaklara yer verilmekle birlikte yabancı kaynak kullanımına ve misyon topluluklarının bilinen kısaltmalarının kullanılmasına önem gösterilmiştir. Anahtar Kelimeler; Tanzanya, Hıristiyanlık, Misyonerlik, Lutheranizm, Leipzig Misyon Cemiyeti. (shrink)