In the present work we explore the effects that an H impurity produces upon the geometry and electronic structure of the CaTiO 3 crystal considering the cubic and orthorhombic crystallographic lattices of the material. A quantum-chemical method based on the Hartree-Fock formalism and the periodic large-unit-cell model is used throughout the work. The analysis of the results shows that the interstitial H impurity binds to one of the O atoms forming the so-called O-H group. At equilibrium, the O-H distances (...) are found to be equal to 0.89 and 1.04 Å for cubic and orthorhombic lattices respectively. Atomic displacements and relaxation energies are analysed comparing the obtained results in the cubic lattice with those in the orthorhombic lattice. In the cubic phase the computed relaxation energy of vicinity of the O-H group is found to be equal to 1.1 eV and the atomic displacements generally obey the Coulomb law. So, the negatively charged O atoms move outwards from the defective region by about 0.09 Å while the positively charged Ti and Ca atoms move towards the defective region by about 0.05 and 0.01 Å respectively. A similar effect is observed in the orthorhombic lattice of CaTiO 3 doped with an H atom. It is necessary to mention that different O positions in the orthorhombic structure are considered for the O-H bond creation. The computed relaxation energies of the atomic displacements in this structure are found to be equal to 2.3 and 2.1 eV depending on the crystallographic type of the bonding O atom. (shrink)

The field of nanotechnology and nanoscience is growing rapidly in many areas of research, from electronics to biomedicine to material science. Carbon nanotubes are receiving a lot of attention in the research due to their unique properties and many possible applications. This new material is a good example of how nanotechnology provides us with new opportunities, but at the same time leaves us a lot of unknowns to deal with. In order to deal with the unknowns we need to (...) consider both the science and the ethics of the different applications of this novel material. Nanoethics is the study of the ethical issues in nanotechnology. It is a relatively new field of study and a lot of different methods have been suggested in this area. In this article a method is suggested combining an existing ethical theory with a practical approach in order to do a case study of the ethical considerations of using carbon nanotubes in biomedicine. For the case study to be of practical significance the scientific characteristics and properties of carbon nanotubes are reviewed to give the reader an overview of the research field. (shrink)

Philosophers have given relatively little attention to the ethical issues surrounding the nature of intellectual property in spite of the fact that for the past ten years the public policy debate over "fair use" of copyrighted materials in higher education has been heating up. This neglect is especially striking since copyright ethics are at stake in so many aspects of academic life: the photocopying of materials for classroom use and scholarly work, access to electronic texts, and the (...) cost and availability of single-source information technology such as Dialogue, library card catalogues, the Oxford English Dictionary, and a variety of other print and electronic resources. Of course, the ethics of copyright are not only an issue for those of us in the business of education: recent allegations of copyright infringement by Texaco, which regularly photocopied articles from scientific and technical journals for its employees, suggests that questions about copyright ethics may arise regularly for every corporation and business. While the current lawsuit against Kinko's Copies(1) and Texaco may settle some public policy questions in the short run, the legal discourse on fair use depends upon competing ethical intuitions which are not likely to be resolved soon. (shrink)

A superconducting transition temperature as high as 100 K was recently discovered in one monolayer FeSe grown on SrTiO3. The discovery ignited efforts to identify the mechanism for the markedly enhanced Tc from its bulk value of 8 K. There are two main views about the origin of the Tc enhancement: interfacial effects and/or excess electrons with strong electron correlation. Here, we report the observation of superconductivity below 20 K in surface electron-doped bulk FeSe. The doped surface layer possesses all (...) the key spectroscopic aspects of the monolayer FeSe on SrTiO3. Without interfacial effects, the surface layer state has a moderate Tc of 20 K with a smaller gap opening of 4.2 meV. Our results show that excess electrons with strong correlation cannot induce the maximum Tc, which in turn reveals the need for interfacial effects to achieve the highest Tc in one monolayer FeSe on SrTiO3. (shrink)

Slater’s method is an integral part of the undergraduate experience. In actuality, Slater’s method is part of an atomic model and not simply a set of rules. Slater’s rules are a simple means for computing the effective nuclear charge experienced by an orbital. These rules are based on the shell-like structure of the Slater atom in which outer shell electrons are incapable of shielding inner electrons. Slater’s model provides a qualitative description of the valence electrons in multi-electron atoms with tremendous (...) ease. The model is useful for explaining atomic properties such as ionisation energy, electron affinity and atomic radius qualitatively. Slater’s rules also correctly reproduce the Madelung rule of filling and the ionisation sequence (4s before 3d); however, these rules are not able to reproduce the anomalous configurations of atoms such as Cr and Cu. It is found that the atomic properties that Slater’s model reproduces are all related to the exponential decay factor of the Slater orbital. We find—from estimating the polarity of a diatomic molecule using a simple model—that molecular polarity is related to the difference in the exponential decay factors of the valence orbitals of the two atoms, implying that the decay factor acts as the electronegativity of the atom. (shrink)

In Victor Hugo’s novel, Notre-Dame de Paris, 1482, the priest says that, alas, ‘this will destroy that’, meaning that the book upon which his hand was placed would destroy the building opposite. He is looking out of a window at the immense Cathedral of Notre-Dame (Hugo, 1967, p. 197). If the cathedral is a library to be read by the religious, and if the church is the symbol of authority and the repository of medieval knowledge, then the priest means not (...) only that the book, printing and new literacy would undermine the church’s authority, but that human thought will undermine the church’s expression of its authority (Bolter, 1991). The priest continues: the principal idea of each generation would no longer write itself with the same material and in the same way, that the book of stone, so solid and durable, would give place to the book made of paper, yet made more solid and durable. (Hugo, 1967, p. 199; Bolter’s 1991 translation). (shrink)

In Victor Hugo’s novel, Notre-Dame de Paris, 1482, the priest says that, alas, ‘this will destroy that’, meaning that the book upon which his hand was placed would destroy the building opposite. He is looking out of a window at the immense Cathedral of Notre-Dame (Hugo, 1967, p. 197). If the cathedral is a library to be read by the religious, and if the church is the symbol of authority and the repository of medieval knowledge, then the priest means not (...) only that the book, printing and new literacy would undermine the church’s authority, but that human thought will undermine the church’s expression of its authority (Bolter, 1991). The priest continues: the principal idea of each generation would no longer write itself with the same material and in the same way, that the book of stone, so solid and durable, would give place to the book made of paper, yet made more solid and durable. (Hugo, 1967, p. 199; Bolter’s 1991 translation). (shrink)

This article describes a descriptive-qualitative method for analyzing and reviewing several textbooks for high school as samples commonly used by teachers and students in their teaching–learning to reveal possible misconceptions. This study focused on the subjects of quantum numbers and electronic configuration. From the advanced literature review to analyze the samples the occurrence of various misconceptions was noted. All textbooks described correctly the four symbols of quantum numbers, but none correlates correctly the magnetic-angular quantum number to the Cartesian labeled (...) orbitals. All textbooks consider mistakenly the meaning of aufbau as the building-up energy of orbitals by following (n + ℓ, n) rules on describing the electronic configuration for all atoms. Only one textbook states that the electronic configuration of transition metal atoms (3d series) can be described in the following order of shell (n), thus giving rise to two types of electronic configurations, [Ar] 3d 4s (Type I) beside [Ar] 4s 3d (Type II), leading further misconception. All textbooks described favorably an unpaired electron of ms = + ½ due to the specific agreement, which is a potential misconception in applying Hund’s rule. In drawing the diagram boxes of orbitals, they are arranged in increasing or decreasing the numeric mℓ, due to the specific agreement, and again leading to a potential misconception on describing the quantum number of electrons issued. Three textbooks introduced the terms of the last and the xth electron associated with the quantum numbers, leading to serious further misconceptions. No books stated that the ordering energy of the (n + ℓ, n) rule is true only for the first twenty atoms. (shrink)

The chapter has four parts. In the first, I argue that we can be justified in believing that there are mind-independent material objects only if we can be justified in believing that modal properties are exemplified in at least some of the regions of space-time that we take to be occupied by material objects. In the second, I argue that we can be justified in believing that modal properties are exemplified in a region only if we can be (...) justified in classificatory judgments--judgments like 'this region contains an F', where 'F' is a name for a natural kind and furthermore constitutes a metaphysically better answer to the question, "What kind of object is in that region?" than any name for any other kind. In the third part, I dismiss as failures three views about how naturalists might be able to be justified in classificatory judgments. I consider a fourth which presupposes that, if there are material objects, then we are justified in believing that science reveals some of them to have proper functions; and I note that if this fourth proposal fails, there is good reason to think that any other proposal will as well. In the final section I argue that this fourth proposal does indeed fail by showing that there are material objects, science does not reveal any of them to have proper functions. If I am right, and if (as seems plausible) we are justified in believing that there exist mind-independent material objects (e.g. people), then we ought to reject naturalism. (shrink)

The idea of “material plenitude” has been gaining traction in recent discussions of the metaphysics of material objects. My main goal here is to show that this idea may have important dialectical implications for the metaphysics of properties – more specifically, that it provides nominalists with new resources in their attempt to reject an ontology of universals. I will recapitulate one of the main arguments against nominalism – due to David Armstrong – and show how plenitude helps the nominalist (...) overcome the argument. (shrink)

This article focuses on the new economy. While a number of recent analyses have considered how new economic arrangements rework a range of material relations, this article suggests that such considerations have tended to stop short of considering how material relations may be reconstituting vis-à-vis the people who are working in the new economy. This is so, it will be argued, because there is a pervasive assumption of what is termed a social contract model of personhood, where people are assumed (...) to own or at least to strive to accumulate skills, capacities and abilities as forms of property in the person. However, what this article underscores is that the relations between people and their labour in the new economy are being reworked. In particular, it highlights how qualities previously associated with people are being disentangled and are becoming the object of processes of qualification and re-qualification. However, such qualities do not take the form of property in the person as claims towards the ‘ownership’ of this labour lie in the domain of audience effects - that is, in relations external to the person. This shift, it is argued further, locates labour in the new economy firmly in the domain of the production and circulation of cultural value. Indeed, more broadly this article suggests that the now commonplace idea that economy and culture are de-differentiating involves a previously unrecognized restructuring of the relations between people and property and even the end of the modern notion of personhood. (shrink)

MATERIALISTS claim that in principle mentality could be accounted for entirely by properties of matter. They must, of course, clarify, as far as possible, the precise scope of the concept "properties of matter." According to materialists there exists only one type of "substance" in the universe, namely matter. Sophisticated experimental and theoretical analyses have led contemporary physicists to interpret known material entities as being composed of two classes of elementary particles, namely quarks and leptons and constituents of interaction (...) fields that mediate interactions between some or all of the elementary particles and which comprise photons, gluons, intermediate bosons and gravitons. For instance, protons and neutrons are composed--by hypothesis--of quarks, while electrons are probably the most familiar leptons. Whether any analyzed and postulated elementary particles and constituents of interaction fields are "ultimate" components of matter can never be known. It remains always possible that more basic subcomponents of known components will be discovered. This has happened repeatedly throughout the history of physics. Hence, what physicists understand by the "physical properties" of the basic components of matter must always remain expressed in terms of usually intricate hypothetico-deductive theories which are tentative and fallible. Contemporary relativistic quantum mechanics of elementary particles and of interaction fields provide typical examples of such hypothetico-deductive theories relating to present known basic components of matter. (shrink)

Property and political obligation are central issues of Locke's Two Treatises of Government. It is agreed that obligation is somehow contingent upon the government's protecting the property of its members. But ‘property’ in the Two Treatises had two meanings — in the state of nature usually referring to material possessions but in civil society meaning ‘life, liberty and estate’ — and its relationship to political obligation is complex. This complexity results from Locke's varying accounts of the movement from the state (...) of nature to civil society: he combined a traditional natural law justification of ownership with a legalist and semi-Aristotelian conception of the ends of and limitations on the state; he failed to provide a full account of the obligation of landless residents; he left unsettled difficulties inherent in the concept ‘property’ itself. Locke's notions of ‘trust’ and the ‘public good’ pointed to solutions to be worked out by future generations. (shrink)

The Materialist who interests me is the one who identifies such things as thoughts with what he speaks of with a degree of grand unspecificity [[sic]] infuriating to the physiologist as "brain processes" or "brain-states." The casual vagueness with which he invokes the brain happens not to affect the logic of his position, and it will prove more useful than to confront him with a physiologist demanding details to face him instead with a philosophical opponent, even if we must resurrect (...) one for the purpose. Let us, then, summon an Idealist from the shadows. His view, expressed equally grosso modo, is that all brain-states are thoughts. As the "is" of either position is the one of identity, the positions sound at this stage dangerously like mere commutations of one another, so in order to forestall the ignominy of saying the same thing while meaning to sound different, the opponents make sly countermoves. The Materialist says that there are brain-states—or even more unspecifically, that there are "material objects"—which are not thoughts ; and the Idealist, that there are thoughts which are not brain-states. These detrivialize [[sic]] the contest, but they equally disguise the contest’s comical ambiguities. It will appear upon analysis of the main strategies of logical offense that these traditional antagonists have been addressing themselves to different matters all along, and are saying different but quite compatible things. My chief reason for exhuming the contest is to illuminate features of Materialism which hardly can be discerned in the context of current preoccupation with predicates and language-games. Allowing myself the privileges of gross discourse which I have accorded my contestants, I shall say: the Idealist has been speaking of the content of thought, the Materialist about thoughts themselves. Let us now aim for a fraction of precision. (shrink)

This article draws on theoretical resources from economic sociology and sociology of law to intervene in economic debates about the relationship between intellectual property and industrialization. Utilizing historical evidence from the earliest period of American intellectual property law and from a formative company in the New England textile industry, I propose a social process of influence that connects intellectual property law to industrialization. I argue that, consistent with the findings of New Economic Sociology, social relationship structures and social capital are (...) the proximate influential force in industrialization. However, I also argue that transformative changes in those social relationship structures are rooted in the emergence of a particular type of political culture: what I call here, borrowing from Hannah Arendt and Frank Dobbin, a “Natal-Industrial Culture.” A Natal-Industrial Culture, as I propose it here, is a political culture in which collective hopes for the future are placed in new technologies and new cultural products, as means for achieving economic growth. Intellectual property law contributed to the emergence of this new type of political culture by holding out the promise of property, as a reward for the provision of new technologies or new cultural products. Because of the way that hope works on motivation—through cognitive pre-rehearsals of future attainment, which involve semantically-meaningful propositions and contribute to positive emotional experience—the promise of property provided a powerful stimulant to social capital formation. Working through the semantic resonances of property, intellectual property law contributed to a political culture in which invention and creativity were expected to secure a future of growth within the political community, both for particular members and for the political community, as a whole. By fostering a Natal-Industrial Culture, intellectual property law contributed to systematic invention and social capital-formation, leading, in turn, to the transformative changes in working and material provisioning that constitute industrialization. (shrink)

While it is a point of agreement in contemporary republican political theory that property ownership is closely connected to freedom as non-domination, surprisingly little work has been done to elucidate the nature of this connection or the constraints on property regimes that might be required as a result. In this paper, I provide a systematic model of the boundaries within which republican property systems must sit and explore some of the wider implications that thinking of property in these terms may (...) have for republicans. The boundaries I focus on relate to the distribution of property and the application of types of property claims over particular kinds of goods. I develop this model from those elements of non-domination most directly related to the operation of a property regime: (a) economic independence, (b) limiting material inequalities, and (c) the promotion of common goods. The limits that emerge from this analysis support intuitive judgments that animate much republican discussion of property distribution. My account diverges from much orthodox republican theory, though, in challenging the primacy of private property rights in the realization of economic independence. The value of property on republican terms can be realized without private ownership of the means of production. (shrink)