This study aimed to provide evidence of validity and reliability for the Perceived Mattering Questionnaire-Physical Education developed by Richards et al. for the Chinese physical education teachers. The PMQ-PE consisted of two factors with four items in each, measuring four dimensions. PMQ-PE in Chinese was validated among 1,278 elementary and secondary school PE teachers in China, of whom 59.0% were secondary PE teachers and 70.2% were males. Confirmatory factor analysis with the entire sample found a poor model fit. Then exploratory (...) factor analysis using half of the sample indicated there was only one factor in PMQ-PEC. CFA of the other half of the sample suggested a one-factor model with the elimination of three unfitted items showed a better fitness to the data. Cronbach's alpha value was also acceptable. The final version of PMQ-PEC included five items with one factor that demonstrated acceptable validity and reliability and was deemed acceptable among Chinese PE teachers after the above modifications were made. (shrink)

Background In Switzerland, right-to-die organisations assist their members with suicide by lethal drugs, usually barbiturates. One organisation, Dignitas, has experimented with oxygen deprivation as an alternative to sodium pentobarbital. Objective To analyse the process of assisted suicide by oxygen deprivation with helium and a common face mask and reservoir bag. Method This study examined four cases of assisted suicide by oxygen deprivation using helium delivered via a face mask. Videos of the deaths were provided by the Zurich police. Dignitas provided (...) protocol and consent information. Results One man and three women were assisted to death by oxygen deprivation. There was wide variation in the time to unconsciousness and the time to death, probably due to the poor mask fit. Swiss law prevented attendants from effectively managing the face mask apparatus. Purposeless movements of the extremities were disconcerting for Dignitas attendants, who are accustomed to assisting suicide with barbiturates. None of the dying individuals attempted self-rescue. Conclusions The dying process of oxygen deprivation with helium is potentially quick and appears painless. It also bypasses the prescribing role of physicians, effectively demedicalising assisted suicide. Oxygen deprivation with a face mask is not acceptable because leaks are difficult to control and it may not eliminate rebreathing. These factors will extend time to unconsciousness and time to death. A hood method could reduce the problem of mask fit. With a hood, a flow rate of helium sufficient to provide continuous washout of expired gases would remedy problems observed with the mask. (shrink)

Whereas boson coherent states with complex parametrization provide an elegant, and intuitive representation, there is no counterpart for fermions using complex parametrization. However, a complex parametrization provides a valuable way to describe amplitude and phase of a coherent beam. Thus we pose the question of whether a fermionic beam can be described, even approximately, by a complex-parametrized coherent state and define, in a natural way, approximate complex-parametrized fermion coherent states. Then we identify four appealing properties of boson coherent states and (...) show that these approximate complex fermion coherent states fail all four criteria. The inapplicability of complex parametrization supports the use of Grassman algebras as an appropriate alternative. (shrink)

This is a selection of readings about professionalism and ethics in engineering. It addresses topics such as the concept of professionalism, education, and maintenance of competence, registration, professional autonomy, social effects and responsibilities, and enforcement of codes of ethics.

Whereas boson coherent states with complex parametrization provide an elegant, and intuitive representation, there is no counterpart for fermions using complex parametrization. However, a complex parametrization provides a valuable way to describe amplitude and phase of a coherent beam. Thus we pose the question of whether a fermionic beam can be described, even approximately, by a complex-parametrized coherent state and define, in a natural way, approximate complex-parametrized fermion coherent states. Then we identify four appealing properties of boson coherent states (eigenstate (...) of annihilation operator, displaced vacuum state, preservation of product states under linear coupling, and factorization of correlators) and show that these approximate complex fermion coherent states fail all four criteria. The inapplicability of complex parametrization supports the use of Grassman algebras as an appropriate alternative. (shrink)

Hastings Center Report, Volume 52, Issue S1, Page S83-S88, March‐April 2022.

Evidence shows that changes in the architecture, design, and decor of health care facilities can improve patient care and in the long run reduce expenses. These essays detail the state of the research, look inside two hospitals that put some of these innovations into practice, and consider how design fits into the moral mission ofhealth care.

In 1975, the English evolutionist William Donald Hamilton held in Brazil a series of lectures entitled “Population genetics and social behaviour”. The unpublished notes of these conferences—written by Hamilton and recently discovered at the British Library—offer an opportunity to reflect on some of the author’s ideas about evolution. The year of the conference is particularly significant, as it took place shortly after the applications of the Price equation with which Hamilton was able to build a model that (...) included several levels of selection. In this paper I mainly analyse the inaugural lecture in which Hamilton proposes a simple model to disprove the hypothesis supported by the British zoologist C. Vero Wynne-Edwards regarding mechanisms to prevent “over-exploitation of the food supply” in “the interests of the survival of the group”. The document presented here is of great historical interest. Not only because manuscript offers a model that—since it was intended for teaching purposes—had never before appeared in the published version, but also because of the general index of the lectures that accompanies it. The latter allows us to make some hypothetical considerations on the relationship and differences between kin-selection, group-selection and inclusive fitness that Hamilton wanted to present to the attentive, well-prepared audience of the foreign university that had invited him. (shrink)

The environment can elicit biological responses such as oxidative stress (OS) and inflammation as a consequence of chemical, physical, or psychological changes. As population studies are essential for establishing these environment-organism interactions, biomarkers of OS or inflammation are critical in formulating mechanistic hypotheses. By using examples of stress induced by various mechanisms, we focus on the biomarkers that have been used to assess OS and inflammation in these conditions. We discuss the difference between biomarkers that are the result of a (...) chemical reaction (such as lipid peroxides or oxidized proteins that are a result of the reaction of molecules with reactive oxygen species) and those that represent the biological response to stress, such as the transcription factor NRF2 or inflammation and inflammatory cytokines. The high-throughput and holistic approaches to biomarker discovery used extensively in large-scale molecular epidemiological exposome are also discussed in the context of human exposure to environmental stressors. We propose to consider the role of biomarkers as signs and to distinguish between signs that are just indicators of biological processes and proxies that one can interact with and modify the disease process. (shrink)

W.D. Hamilton, Narrow Roads of Gene Land: The Collected Papers of W.D. Hamilton.

According to history texts, philosophers searched for a unifying natural law whereby natural phenomena and numbers are related. More than 2300 years ago, Aristotle postulated that nature requires minimum energy. More than 220 years ago, Euler applied the minimum energy postulate. More than 200 years ago, Lagrange provided a mathematical “proof” of the postulate for conservative systems. The resulting Principle of Least Action served only to derive the differential equations of motion of a conservative system. Then, 170 years ago, (...) class='Hi'>Hamilton presented what he claimed to be a “general method in dynamics.” Hamilton's resulting “Law of Varying Action” was supposed to apply to both conservative and non-conservative systems and was supposed to yield either the differential equations of motion or the integrals of those differential equations. However, no direct evaluation of the integrals of motion ever resulted from Hamilton's law of varying action. In 1975, a scant 29 years ago, following five years of controversy with engineer mechanicians, Dr. Wolfgang Yourgrau, Editor, Foundations of Physics, published my first paper based on Aristotle's postulate, without mathematical proof. That and subsequent papers present, through applications, a true “general method in dynamics.” In this essay, I present the mathematical proof that is missing from my 1975 and subsequent papers. Six fundamental integrals of analytical mechanics are derived from Aristotle's postulate. First, however, Hamilton must be revisited to show why his H function and his “force function” prevents the law of varying action from being the general method in dynamics that he claimed it to be. I have found that Hamilton’s Law of Varying Action (HLVA), as Hamilton presented it, cannot be applied to systems for which the force function is non-integrable. In 1972, Dr. B.E. Gatewood and Dr. D.P. Beres (then a graduate student) discovered that the end-point term associated with the principle of least action does not vanish. I named the new equation, “the general energy equation.” In 1973, because I was doing with it what Hamilton claimed could be done with HLVA, I simply assumed that this new equation was HLVA. I gave the new equation the misnomer HLVA. In 2001, I learned that I had made a grave mistake. I found that HLVA is at most a special case of the general energy equation. My interpretation of Aristotle's postulate permits one to by-pass the differential equations of motion completely for both conservative and non-conservative systems (no calculus of variations). (shrink)

Les œuvres musicales et les sons semblent devoir résister aux tentatives faites pour leur attribuer un sens stable et clairement défini. Historiquement, le flou sémantique qui les caractérise a toujours compliqué la tâche de ceux qui se sont efforcés de leur attribuer une « valeur » esthétique, par exemple au sein d’une hiérarchie des genres. Il s’agit toujours d’endiguer leur dangereux excès asymbolique en les déchiffrant, en leur imposant symboles et prédicats. Le présent essai propose une analyse d’ Un re (...) in ascolto [ Un roi à l’écoute ] d’Italo Calvino (1976), redéfinissant à nouveaux frais la notion de souveraineté afin de mieux comprendre la nature d’une telle stratégie herméneutique, et les raisons de son échec. Le souverain tel que nous le décrit Calvino est-il en mesure de conférer un sens à la musique et au chant en les intégrant au sein d’un système sémantique clos? Ou l’expérience musicale doit-elle au contraire être décrite comme fondamentalement incompatible avec une telle herméneutique totalisante, appelant une analyse fondée sur une vision pluraliste, horizontale, et non-hiérarchique des relations entre les différents modes d’expression artistique? (shrink)

Hamilton's principle and Hamilton's law are discussed. Hamilton's law is then applied to achieve direct solutions to time-dependent, nonconservative, initial value problems without the use of the theory of differential or integral equations. A major question has always plagued competent investigators who use “energy methods,” viz., “Why is it that one can derive the differential equations for a system from Hamilton's principle and then solve these equations (at least in principle) subject to applicable initial and boundary (...) conditions; but one cannot obtain a solution directly from Hamilton's principle except in very special cases?” This paper provides the answer to that question. In Hamilton's own words, “... the peculiar combination it [i.e., Hamilton's law] involves, of the principles of variations with those of partial differentials, for the determination and use of an important class of integrals, may constitute, when it shall be matured by the future labors of mathematicians, a separate branch of analysis.”. (shrink)

Although America’s founders may have been inspired by the political thought of ancient Greece and Rome, the United States is more often characterized by its devotion to the pursuit of commerce. Some have even said that a modern commercial republic such as the United States unavoidably lowers its moral horizon to little more than a concern with securing peace and prosperity so that commerce can flourish. Michael Chan reconsiders this view of America through close readings of Aristotle and Alexander (...) class='Hi'>Hamilton, showing that America at its founding was neither as modern nor as low as we have been led to believe. He challenges the virtue/commerce divide that dominates modern thought by demonstrating that the prevailing views of Aristotle and Hamilton on commerce reflect misleading half-truths. Chan first examines Aristotle’s views of economics as presented in the _Politics_, arguing that Aristotle was not as hostile to commerce as is commonly believed. He points out the philosopher’s belief in the value of commercial acquisition in the interest of supplying citizens with the “equipment of virtue,” citing Aristotle’s praise of commercial Carthage over agrarian but much-esteemed Sparta. Chan then turns to a detailed account of the political economy of Hamilton, a proponent of an advanced industrial republic modeled on Great Britain. While many take Hamilton’s advocacy of public credit, a national bank, and manufacturing as evidence of his rejection of classical republican thought in favor of modernity, Chan contends that Hamilton embraced a classically inspired economic statesmanship that transcended a concern with merely securing peace and prosperity. Leading the reader through the complexities of Hamilton’s thought, Chan shows that he intended commerce to pursue the wider classical goals of forming the character of citizens, establishing harmony and justice, and pursuing national greatness. Rather than attempting to brand Hamilton an Aristotelian, Chan seeks to incorporate into the study of Hamilton’s political economy what Aristotle himself regarded as the statesman’s characteristic virtue, prudence. By reflecting on Hamilton in the context of Aristotle’s own reflections on commerce, Chan casts him in a new light that cuts across the ongoing debate about liberal versus classical republican elements of the American founding. His cogent analysis also raises important questions regarding the American system as it is being challenged by conflicting worldviews. _Aristotle and Hamilton on Commerce and Statesmanship _makes a significant contribution to our understanding of both Hamiltonian thought and the moral worthiness of democratic capitalism. (shrink)