Several versions exist of pseudo-classical models of the electron using Grassmann variables. Most of these require additional constraints on the variables, and it is these which, when quantized, lead to Dirac's equation. In addition, the Grassmann variables do not have physical interpretations. In this article a model is constructed which does not require constraints and in which the Grassmann variables can be interpreted as observables. Dirac's equation is obtained directly from quantization.

This paper reports on-going work in the eSCAPE Project (Esprit Long Term Research Project 25377) directed to the research and development of electronic landscapes for public use. Our concern here is to elucidate a sociologically informed approach towards the design of electronic landscapes or virtual worlds. We suggest — and demonstrate through ethnographic studies of virtual technologies at a multimedia art museum and information technology trade show — that members sense of space is produced through social practices (...) tied to the accomplishment of activities occurring within the locations their actions are situated. Space, in other words, is socially constructed and shaped through members’ practices for accomplishing situated activities. We explicate, by practical examples, an approach to discovering social practices in and through which a sense of space is constructed and outline how such understandings may be used to formulate requirements for the design of electronic landscapes. In explicating our ethnographically informed approach, we outline how future technologies may bedeveloped through the situated evaluation of experimental prototypes in public use. (shrink)

The specific arrangements of power/knowledge that characterize nurse interactions with the electronic health record form a panopticon. As health care moves into the 21st century, sophisticated technologies like the electronic health record shape the terrain of professional possibilities. The longer it is in use, the more it is possible to excavate the inherent disciplinary function of electronic health record. A panopticon is a generalizable, replicable apparatus of power that cultivates discipline when similar behaviours are desired from a (...) group of people. This paper traces the arrangements of power/knowledge that characterize nurse interactions with the electronic health record rooted in a trauma critical care setting. Examining the apparatuses of power/knowledge enforced through panopticism in nursing makes the invisible visible. This in turn enables nurses to address the intended and unintended consequences of the electronic health record. If nurses are to effectively shape the direction of their own futures and the future of health care, nurses will need to unpack the invisible techniques of power such as the electronic health record as a panopticon. In the process of building a visible identity, contextualizing nursing knowledge to better care for patients on the one hand and understand the relationships of power that limit us on the other, nurses are neither apolitical nor powerless. Considering the dialectic of power/knowledge in the healthcare setting helps to illuminate spaces to recharacterize nursing, reveal the contributions and knowledge of nurses, and consolidate the professional power of nurses to affect meaningful change and self‐governance in the healthcare setting. (shrink)

The introduction of electron microscopy profoundly altered biomedical research, providing a tool for a more detailed but at the same time a spatially and temporally more restricted visual analysis. Examining the case study of Golgi apparatus research in the 1950s and 1960s, it will be shown how microscopists handled these challenges, and how these confrontations modified the general concept of cellular organization. This will also shed light on the artifact debate and on the question of scientific realism in the field (...) of microscopy. (shrink)

Russian abstract: В данном сборнике статей раскрывается формирование структурно-онтологического представления о таком явлении, как городское пространство. Наряду с соответствующей концептуализацией, также представлено и объяснено определение городского сообщества. Обоснована логика классификации городских сообществ. А также проанализированы факторы, обуславливающие их устойчивость. -/- English abstract: This collection of articles reveals the formation of a structural-ontological concept of such a phenomenon as urban space. Along with relevant conceptualization, the definition of an urban community is also presented and explained. The logic of classification of (...) urban communities is substantiated. And also analyzed the factors that determine their stability. (shrink)

The purpose of the two studies reported here was to develop an integrated model of the scientific reasoning process. Subjects were placed in a simulated scientific discovery context by first teaching them how to use an electronic device and then asking them to discover how a hitherto unencountered function worked. To do this task, subjects had to formulate hypotheses based on their prior knowledge, conduct experiments, and evaluate the results of their experiments. In the first study, using 20 adult (...) subjects, we identified two main strategies that subjects used to generate new hypotheses. One strategy was to search memory and the other was to generalize from the results of previous experiments. We described the former group as searching an hypothesis space, and the latter as searching an experiment space. In a second study, with 10 adults, we investigated how subjects search the hypothesis space by instructing them to state all the hypotheses that they could think of prior to conducting any experiments. Following this phase, subjects were then allowed to conduct experiments. Subjects who could not think of the correct rule in the hypothesis generation phase discovered the correct rule only by generalizing from the results of experiments in the experimental phase.Both studies provide support for the view that scientific reasoning can be characterized as search in two problem spaces. By extending Simon and Lea's (1974) Generalized Rule Inducer, we present a general model of Scientific Discovery as Dual Search (SDDS) that shows how search in two problem spaces (an hypothesis space and an experiment space) shapes hypothesis generation, experimental design, and the evaluation of hypotheses. The model also shows how these processes interact with each other. Finally, we interpret earlier findings about the psychology of scientific reasoning in terms of the SDDS model. (shrink)

Space warfare is warfare that takes place in outer space. It involves ground-to-space, space-to-ground, and space-to-space violence between nations or peoples. The violence can involve kinetic weapons, directed energy weapons, or electronic destruction. International law, specifically, the Outer Space Treaty and SALT I, currently bans weapons of mass destruction from being put into space, although one wonders if one country were to violate the ban whether others would follow suit. In this (...) paper, I argue that that if there is a non-consequentialist morality of space war, then one country can unjustly attack a second country’s space vehicles. This in turn depends on property rights. But there is no adequate theory of property rights with regard to space war. Hence, there is no non-consequentialist morality of a space war. (shrink)

The purpose of the two studies reported here was to develop an integrated model of the scientific reasoning process. Subjects were placed in a simulated scientific discovery context by first teaching them how to use an electronic device and then asking them to discover how a hitherto unencountered function worked. To do this task, subjects had to formulate hypotheses based on their prior knowledge, conduct experiments, and evaluate the results of their experiments. In the first study, using 20 adult (...) subjects, we identified two main strategies that subjects used to generate new hypotheses. One strategy was to search memory and the other was to generalize from the results of previous experiments. We described the former group as searching an hypothesis space, and the latter as searching an experiment space. In a second study, with 10 adults, we investigated how subjects search the hypothesis space by instructing them to state all the hypotheses that they could think of prior to conducting any experiments. Following this phase, subjects were then allowed to conduct experiments. Subjects who could not think of the correct rule in the hypothesis generation phase discovered the correct rule only by generalizing from the results of experiments in the experimental phase.Both studies provide support for the view that scientific reasoning can be characterized as search in two problem spaces. By extending Simon and Lea's (1974) Generalized Rule Inducer, we present a general model of Scientific Discovery as Dual Search (SDDS) that shows how search in two problem spaces (an hypothesis space and an experiment space) shapes hypothesis generation, experimental design, and the evaluation of hypotheses. The model also shows how these processes interact with each other. Finally, we interpret earlier findings about the psychology of scientific reasoning in terms of the SDDS model. (shrink)

The electron is conceived here as a complex structure composed of a subparticle that is bound to a nearly circular motion. Although in quantum mechanics the spin is not representable, in classical stochastic physics this corresponds to the angular momentum of the subparticle. In fact, assuming Schrödinger-type hydrodynamic equations of motion for the subparticle, the spin-1/2 representation in configuration space and the corresponding Pauli matrices for the electron are obtained. The Hamiltonian of Pauli's theory as the nonrelativistic limit of (...) Dirac's equation is also derived. (shrink)

SOUL SPACE is a poetic photo book about the ways in which God is manifest as a hidden travel advisor. Challenging the existing religious communities, Soul Space announces the birth of the eMigrant - an electronic Deity that will alter our world in an unprecedented manner. -/- Soul Space combines philosophy and photography in an inquiry into religious experience. The book covers the first part of a trilogy aiming to study and elaborate three different perspectives on (...) the nature of God. Soul Space addresses the human perspective, questioning the ways in which God is manifest as a hidden travel advisor and how this forceful phenomenon can be captured photographically. With a focus on the quest for how to live, the ultimate goal is to show that God is a sign of our evolutionary potential. -/- Isbn 978-90-804240-5-0. (shrink)

This article re-examines Schrödinger’s charge density hypothesis, according to which the charge of an electron is distributed in the whole space, and the charge density in each position is proportional to the modulus squared of the wave function of the electron there. It is shown that the charge distribution of a quantum system can be measured by protective measurements as expectation values of certain observables, and the results as predicted by quantum mechanics confirm Schrödinger’s original hypothesis. Moreover, the physical (...) origin of the charge distribution is also investigated. It is argued that the charge distribution of a quantum system is effective, that is, it is formed by the ergodic motion of a localized particle with the charge of the system. (shrink)

It is argued that some elusive “entropic” characteristics of chemical bonds, e.g., bond multiplicities (orders), which connect the bonded atoms in molecules, can be probed using quantities and techniques of Information Theory (IT). This complementary perspective increases our insight and understanding of the molecular electronic structure. The specific IT tools for detecting effects of chemical bonds and predicting their entropic multiplicities in molecules are summarized. Alternative information densities, including measures of the local entropy deficiency or its displacement relative to (...) the system atomic promolecule, and the nonadditive Fisher information in the atomic orbital resolution(called contragradience) are used to diagnose the bonding patterns in illustrative diatomic and polyatomic molecules. The elements of the orbital communication theory of the chemical bond are briefly summarized and illustrated for the simplest case of the two-orbital model. The information-cascade perspective also suggests a novel, indirect mechanism of the orbital interactions in molecular systems, through “bridges” (orbital intermediates), in addition to the familiar direct chemical bonds realized through “space”, as a result of the orbital constructive interference in the subspace of the occupied molecular orbitals. Some implications of these two sources of chemical bonds in propellanes, π-electron systems and polymers are examined. The current–density concept associated with the wave-function phase is introduced and the relevant phase-continuity equation is discussed. For the first time, the quantum generalizations of the classical measures of the information content, functionals of the probability distribution alone, are introduced to distinguish systems with the same electron density, but differing in their current(phase) composition. The corresponding information/entropy sources are identified in the associated continuity equations. (shrink)

This chapter discusses the roles of ether and electrons in relativity theory. One of the most radical moves made by Albert Einstein was to dismiss the ether from electrodynamics. His fellow physicists felt challenged by Einstein’s view, and they came up with a variety of responses, ranging from enthusiastic approval, to dismissive rejection. Among the naysayers were the electron theorists, who were unanimous in their affirmation of the ether, even if they agreed with other aspects of Einstein’s theory of relativity. (...) The eventual success of the latter theory (circa 1911) owed much to Hermann Minkowski’s idea of four-dimensional spacetime, which was portrayed as a conceptual substitute of sorts for the ether. (shrink)

Announcement: Would you like to see back issues of this column? Electronic copies are now available on Internet/WorldWideWeb as HTML files, with both subject and chronological indexes. About 80 of my columns are available, published in Analog between July-1984 and a few months ago. I plan to add one column to this archive each time a new one is published in Analog. The URL address for this Alternate View column archive is.

It is shown that the de Broglie-Bohm theory has a potential problem concerning the charge distribution of a quantum system such as an electron. According to the guidance equation of the theory, the electron's charge is localized in a position where its Bohmian particle is. But according to the Schrödinger equation of the theory, the electron's charge is not localized in one position but distributed throughout space, and the charge density in each position is proportional to the modulus square (...) of the wave function of the electron there. Although this tension may be resolved by assuming that the electron's charge is not e but 2e, one for its Bohmian particle and the other for its wave function, the resolution will introduce more serious problems. (shrink)

In recent years, there has been a growing interest in the geographies of electronic waste (e-waste). Several studies have examined how e-waste is increasingly exported to processing sites in China, India, Pakistan, Ghana and elsewhere across the global south, where it leads to devastating health effects. Through an interdisciplinary patchwork of human geography, public health, narrative theory, and philosophies of memory, this paper seeks to show how the export of e-waste to the global south—and the toxins it brings along (...) with it—is part of what makes “resilient” urban growth and citizenship possible elsewhere, particularly in the San Francisco Bay Area. The surplus value of technological production is only recuperable, in places like Silicon Valley, if its toxicity is spatially and temporally displaced onto— and hidden within— surplus bodies who are cast into necropolitical terrains of ill- health and danger. Tracing this story of e-waste, which spans from the epigenetic to the geopolitical, from the San Francisco Bay Area to China’s Greater Bay Area, requires a method of empirical allegory that can detect global iniquities on the most granular of scales, and vice versa. (shrink)

According to the BSM Supergravitation Unified Theory, the physical vacuum contains energy that is not of electromagnetic origin. The Heterodyne Resonance Mechanism (HRM) predicted by the theory permits access to this hidden energy by a process involving the anomalous magnetic moment and the quantum mechanical spin flipping of the electron. Plasma experiments and analysis of lightning observations indicate that the HRM effect could be involved in the natural lightning phenomena. Although the energy density of this hidden source is much smaller (...) than nuclear energy, the opportunity to access this energy will lead to some new practical applications. The derived physical model of the HRM effect provides the opportunity for development of new technologies. This book could be an useful handbook for researchers and experimenters. (shrink)

It is a commonplace in the philosophy of physics that any local physical theory can be represented using arbitrary coordinates, simply by using tensor calculus. On the other hand, the physics literature often claims that spinors \emph{as such} cannot be represented in coordinates in a curved space-time. These commonplaces are inconsistent. What general covariance means for theories with fermions, such as electrons, is thus unclear. In fact both commonplaces are wrong. Though it is not widely known, Ogievetsky and Polubarinov (...) constructed spinors in coordinates in 1965, enhancing the unity of physics and helping to spawn particle physicists' concept of nonlinear group representations. Roughly and locally, these spinors resemble the orthonormal basis or "tetrad" formalism in the symmetric gauge, but they are conceptually self-sufficient and more economical. The typical tetrad formalism is de-Ockhamized, with six extra field components and six compensating gauge symmetries to cancel them out. The Ogievetsky-Polubarinov formalism, by contrast, is Ockhamized, with most of the fluff removed. As developed nonperturbatively by Bilyalov, it admits any coordinates at a point, but "time" must be listed first. Here "time" is defined in terms of an eigenvalue problem involving the metric components and the matrix $diag$, the product of which must have no negative eigenvalues in order to yield a real symmetric square root that is a function of the metric. Thus even formal general covariance requires reconsideration; the atlas of admissible coordinate charts should be sensitive to the types and \emph{values} of the fields involved. Apart from coordinate order and the usual spinorial two-valuedness, Ogievetsky-Polubarinov spinors form, with the metric, a nonlinear geometric object, for which important results on Lie and covariant differentiation are recalled. Such spinors avoid a spurious absolute object in the Anderson-Friedman analysis of substantive general covariance. They also permit the gauge-invariant localization of the infinite-component gravitational energy in General Relativity. Density-weighted spinors exploit the conformal invariance of the massless Dirac equation to show that the volume element is absent. Thus instead of an arbitrary nonsingular matrix with 16 components, 6 of which are gauged away by a new local $O$ gauge group and one of which is irrelevant due to conformal covariance, one can, and presumably should, use density-weighted Ogievetsky-Polubarinov spinors coupled to the 9-component symmetric square root of the part of the metric that fixes null cones. Thus $\frac{7}{16}$ of the orthonormal basis is eliminated as surplus structure. Greater unity between spinors and tensors and the like is achieved, such as regarding conservation laws. Regarding the conventionality of simultaneity, an unusually wide range of $\epsilon$ values is admissible, but some extreme values are inadmissible. Standard simultaneity uniquely makes the spinor transformation law linear and independent of the metric, because transformations among the standard Cartesian coordinate systems fall within the conformal group, for which the spinor transformation law is linear. The surprising mildness of the restrictions on coordinate order as applied to the Schwarzschild solution is exhibited. (shrink)

It is a commonplace in the philosophy of physics that any local physical theory can be represented using arbitrary coordinates, simply by using tensor calculus. On the other hand, the physics literature often claims that spinors \emph{as such} cannot be represented in coordinates in a curved space-time. These commonplaces are inconsistent. What general covariance means for theories with fermions, such as electrons, is thus unclear. In fact both commonplaces are wrong. Though it is not widely known, Ogievetsky and Polubarinov (...) constructed spinors in coordinates in 1965, enhancing the unity of physics and helping to spawn particle physicists' concept of nonlinear group representations. Roughly and locally, these spinors resemble the orthonormal basis or "tetrad" formalism in the symmetric gauge, but they are conceptually self-sufficient and more economical. The typical tetrad formalism is de-Ockhamized, with six extra field components and six compensating gauge symmetries to cancel them out. The Ogievetsky-Polubarinov formalism, by contrast, is Ockhamized, with most of the fluff removed. As developed nonperturbatively by Bilyalov, it admits any coordinates at a point, but "time" must be listed first. Here "time" is defined in terms of an eigenvalue problem involving the metric components and the matrix $diag$, the product of which must have no negative eigenvalues in order to yield a real symmetric square root that is a function of the metric. Thus even formal general covariance requires reconsideration; the atlas of admissible coordinate charts should be sensitive to the types and \emph{values} of the fields involved. Apart from coordinate order and the usual spinorial two-valuedness, Ogievetsky-Polubarinov spinors form, with the metric, a nonlinear geometric object, for which important results on Lie and covariant differentiation are recalled. Such spinors avoid a spurious absolute object in the Anderson-Friedman analysis of substantive general covariance. They also permit the gauge-invariant localization of the infinite-component gravitational energy in General Relativity. Density-weighted spinors exploit the conformal invariance of the massless Dirac equation to show that the volume element is absent. Thus instead of an arbitrary nonsingular matrix with 16 components, 6 of which are gauged away by a new local $O$ gauge group and one of which is irrelevant due to conformal covariance, one can, and presumably should, use density-weighted Ogievetsky-Polubarinov spinors coupled to the 9-component symmetric square root of the part of the metric that fixes null cones. Thus $\frac{7}{16}$ of the orthonormal basis is eliminated as surplus structure. Greater unity between spinors and tensors and the like is achieved, such as regarding conservation laws. Regarding the conventionality of simultaneity, an unusually wide range of $\epsilon$ values is admissible, but some extreme values are inadmissible. Standard simultaneity uniquely makes the spinor transformation law linear and independent of the metric, because transformations among the standard Cartesian coordinate systems fall within the conformal group, for which the spinor transformation law is linear. The surprising mildness of the restrictions on coordinate order as applied to the Schwarzschild solution is exhibited. (shrink)

System Requirements System requirements Minimum 80486, 66MHz IBM PC or full compatible ; Minimum 16MB RAM 177MB hard disk space to store and run the Nachlass, an extra 12MB in addition to this should be available during installation. SVGA monitor set to 800x600 pixels, 16-bit colour, or higher setting recommended to use and display the transcription text and facsimiles; Quad-speed CD-ROM drive or higher; Windows 3.1, 3.11; Windows 95/98; Windows NT 4.0; Windows 2000. Microsoft mouse or compatible Network versions (...) Windows NT 4, and Novell networks. Customers with Wide Area Networks should ring Customer Services to discuss specific requirements. Customer Service Contact: Customer Services, Electronic Publishing Tel: +44 1865 267979 Fax: +44 1865 267990 Email: [email protected]. (shrink)

In this paper, we address the relevance of virtual worlds for negotiation using the example of Second Life and AltspaceVR; we take into account mindset issues and an avatar’s influence on this process. The concept of negotiation is related here to the concept of a networked society to describe actions undertaken between two or more individuals, groups, and/or organizations. The network is a milieu for negotiating with oneself and with others. Negotiating in a networked space can be an opportunity (...) for self-exploration, subversion, and compensation for the limitations of physical reality, and it also involves background problems and the displacement of power. The term “negotiation” is used in online communities to describe interactions between people who are not physically present but interact with each other through some technical devices, such as the telephone or the Internet. In the waves of technological development, how people organize their lives and behave is a question of convenience. Virtual worlds, in which the human is extended by an avatar (and the avatar by the electronic space), are now being transformed into worlds where the human is just the avatar. The avatar is in the same space the human is in, i.e., in the physical world. This transformation (in fact, a paradigm shift) involves changing the habits of users, who are now adopting new habits in the form of negotiating the physical world with the values and habits of the virtual world. (shrink)

It is a commonplace in the philosophy of physics that any local physical theory can be represented using arbitrary coordinates, simply by using tensor calculus. On the other hand, the physics literature often claims that spinors \emph{as such} cannot be represented in coordinates in a curved space-time. These commonplaces are inconsistent. What general covariance means for theories with fermions, such as electrons, is thus unclear. In fact both commonplaces are wrong. Though it is not widely known, Ogievetsky and Polubarinov (...) constructed spinors in coordinates in 1965, enhancing the unity of physics and helping to spawn particle physicists' concept of nonlinear group representations. Roughly and locally, these spinors resemble the orthonormal basis or "tetrad" formalism in the symmetric gauge, but they are conceptually self-sufficient and more economical. The typical tetrad formalism is de-Ockhamized, with six extra field components and six compensating gauge symmetries to cancel them out. The Ogievetsky-Polubarinov formalism, by contrast, is Ockhamized, with most of the fluff removed. As developed nonperturbatively by Bilyalov, it admits any coordinates at a point, but "time" must be listed first. Here "time" is defined in terms of an eigenvalue problem involving the metric components and the matrix $diag$, the product of which must have no negative eigenvalues in order to yield a real symmetric square root that is a function of the metric. Thus even formal general covariance requires reconsideration; the atlas of admissible coordinate charts should be sensitive to the types and \emph{values} of the fields involved. Apart from coordinate order and the usual spinorial two-valuedness, Ogievetsky-Polubarinov spinors form, with the metric, a nonlinear geometric object, for which important results on Lie and covariant differentiation are recalled. Such spinors avoid a spurious absolute object in the Anderson-Friedman analysis of substantive general covariance. They also permit the gauge-invariant localization of the infinite-component gravitational energy in General Relativity. Density-weighted spinors exploit the conformal invariance of the massless Dirac equation to show that the volume element is absent. Thus instead of an arbitrary nonsingular matrix with 16 components, 6 of which are gauged away by a new local $O$ gauge group and one of which is irrelevant due to conformal covariance, one can, and presumably should, use density-weighted Ogievetsky-Polubarinov spinors coupled to the 9-component symmetric square root of the part of the metric that fixes null cones. Thus $\frac{7}{16}$ of the orthonormal basis is eliminated as surplus structure. Greater unity between spinors and tensors and the like is achieved, such as regarding conservation laws. Regarding the conventionality of simultaneity, an unusually wide range of $\epsilon$ values is admissible, but some extreme values are inadmissible. Standard simultaneity uniquely makes the spinor transformation law linear and independent of the metric, because transformations among the standard Cartesian coordinate systems fall within the conformal group, for which the spinor transformation law is linear. The surprising mildness of the restrictions on coordinate order as applied to the Schwarzschild solution is exhibited. (shrink)

In this work, a neo-classical relativistic mechanics theory is presented where the spin of an electron is an inherent part of its world space-time path as a point particle. The fourth-order equation of motion corresponds to the same covariant Lagrangian function in proper time as in special relativity except for an additional spin energy term. The theory provides a hidden-variable model of the electron where the dynamic variables give a complete description of its motion, giving a classical mechanics explanation (...) of the electron’s spin, its dipole moments, and Schrödinger’s zitterbewegung, These features are also described mathematically by quantum mechanics theory, of course, but without any physical picture of an underlying reality. The total motion of the electron can be decomposed into a sum of a local spin motion about a point and a global motion of this point, called here the spin center. The global motion is sub-luminal and described by Newton’s Second Law in proper time, the time for a clock fixed at the spin center, while the total motion occurs at the speed of light c, consistent with the eigenvalues of Dirac’s velocity operators having magnitude c. The local spin motion is an inherent perpetual motion, which for a free electron is periodic at the ultra-high zitterbewegung frequency and its path is circular in a spin-center reference frame. In an electro-magnetic field, this spin motion generates magnetic and electric dipole energies through the Lorentz force on the electron’s point charge. The electric dipole energy corresponds to the spin-orbit coupling term involving the electric field that appears in the corrected Pauli non-relativistic Hamiltonian, which has long been used to explain the doublet structure of the spectral lines of the excited hydrogen atom. Pauli’s spin-orbit term is usually derived, however, from his magnetic dipole energy term, including also the effect of Thomas precession, which halves this energy. The magnetic dipole energy from Pauli’s and Dirac’s theory is twice that in the neo-classical theory, a discrepancy that has not been resolved. By defining a spin tensor as the angular momentum of the electron’s total motion about its spin center, the fundamental equations of motion can be re-written in an identical form to those of the Barut–Zanghi electron theory. This allows the equations of motion to be expressed in an equivalent form involving operators applied to a state function of proper time satisfying a neo-classical Dirac–Schrödinger spinor equation. This state function produces the dynamic variables from the same operators as in Dirac’s theory for the electron but without any probability implications. It leads to a neo-classical wave function that satisfies Dirac’s relativistic wave equation for the free electron by applying the Lorentz transformation to express proper time in the state function in terms of an observer’s space-time coordinates, showing that there is a close connection between the neo-classical theory and quantum mechanics theory for the electron’s dynamics. (shrink)

An equation proposed by Levy, Perdew and Sahni (Phys. Rev. A 30:2745, 1984) is an orbital-free formulation of density functional theory. However, this equation describes a bosonic system. Here, we analyze on a very fundamental level, how this equation could be extended to yield a formulation for a general fermionic distribution of charge and spin. This analysis starts at the level of single electrons and with the question, how spin actually comes into a charge distribution in a non-relativistic model. To (...) this end we present a space-time model of extended electrons, which is formulated in terms of geometric algebra. Wave properties of the electron are referred to mass density oscillations. We provide a comprehensive and non-statistical interpretation of wavefunctions, referring them to mass density components and internal field components. It is shown that these wavefunctions comply with the Schrödinger equation, for the free electron as well as for the electron in electrostatic and vector potentials. Spin-properties of the electron are referred to intrinsic field components and it is established that a measurement of spin in an external field yields exactly two possible results. However, it is also established that the spin of free electrons is isotropic, and that spin-dynamics of single electrons can be described by a modified Landau-Lifshitz equation. The model agrees with the results of standard theory concerning the hydrogen atom. Finally, we analyze many-electron systems and derive a set of coupled equations suitable to characterize the system without any reference to single electron states. The model is expected to have the greatest impact in condensed matter theory, where it allows to describe an N-electron system by a many-electron wavefunction Ψ of four, instead of 3N variables. The many-body aspect of a system is in this case encoded in a bivector potential. (shrink)

Proxy signature and group signature are two basic cryptographic primitives. Due to their valuable characteristics, many schemes have been put forward independently and they have been applied in many practical scenarios up to the present. However, with the development of electronic commerce, many special requirements come into being. In this article, we put forward the concept of group–proxy signature, which integrates the merits of proxy signature and group signature for the first time. We also demonstrate how to apply our (...) scheme to construct an electronic cash system. The space, time, and communication complexities of the relevant parameters and processing procedures are independent of group size. Our demonstration of the concrete group–proxy signature scheme shows that the concepts brought forward by us are sure to elicit much consideration in the future. (shrink)

Atiyah and Sutcliffe made a number of conjectures about configurations of N distinct points in hyperbolic 3-space, arising from ideas of Berry and Robbins. In this paper we prove all these conjectures, purely geometrically, but we also provide a physical interpretation in terms of Electrons.

In “Materialized Oppression in Medical Tools and Technologies”, we show how oppression can be inscribed in medical devices. We consider oximeters and spirometers, drawing heavily on the work of anthropologist Amy Moran-Thomas and historian Lundy Braun. Both devices encode racial biases: oximeters because they do not correct for race, and spirometers because they do. We zoom out from these particular devices to examine a wide range of tools and technologies, and we build a theoretical framework that covers not only race (...) but other axes of oppression: gender, ability, class, etc. -/- We are inspired by the peer commentaries and the guest editorial, and we are grateful to the contributors for engaging with our work and sharing their expertise. Their responses to our target article advance our understanding in three directions. First, a set of responses contextualize our framework within the histories of medicine, bioethics, and science and technology studies. Second, a set of responses provide additional examples of oppressive medical tools and technologies: not only material artifacts like oximeters and spirometers, but also spatial environments like inpatient psychiatric units, and cognitive niches comprised of digital technologies like electronic medical records and medical data classifications. Third, a set of responses propose countermeasures: operationalizing anti-oppressive practices for device design and testing; mapping the complex causal relationships involved in real-world problems; and repairing the harms done by materialized oppression through racism-conscious praxis. We reply to these three sets of responses—respectively, the “past, present, and future” of oppressive medical objects and spaces—in what follows. (shrink)

The quantum theory of atoms in molecules (QTAIM) uses physics to define an atom and its contribution to observable properties in a given system. It does so using the electron density and its flow in a magnetic field, the current density. These are the two fields that Schrödinger said should be used to explain and understand the properties of matter. It is the purpose of this paper to show how QTAIM bridges the conceptual gulf that separates the observations of chemistry (...) from the realm of physics and do so in a manner that is both rigorous and conceptually simple. Since QTAIM employs real measurable fields, it enables one to present the findings of complex quantum mechanical calculations in a pictorial manner that isolates the essential physics. The time has arrived for a sea change in our attempts to predict and classify the observations of chemistry, time to replace the use of simplified and arbitrary models with the full predictive power of physics, as applied to an atom in a molecule. (shrink)

Using a concept she calls authenticity maneuvering to explain how clubs, clubbers, and DJs navigate authenticity, branding, and commercialism, Danielle Hidalgo argues that the strategic use of a rave ethos bolsters acceptance in dance music spaces while also making commercial practices less visible or problematic.

The total electron content in the ionosphere widely influences Global Navigation Satellite Systems especially for critical applications by inducing localized positional errors in the GNSS measurements. These errors can be mitigated by measuring TEC from stations located around the world at various temporal and spatial scales and using them for advanced forecasting of TEC. The TEC can be used as a tool in understanding space weather phenomena such as geomagnetic storms which cause disruptions in the ionosphere. This paper examines (...) the causal relationship between perturbations in TEC caused by geomagnetic storms. The causality between two geomagnetic indices auroral electrojet and disturbed storm index and TEC is investigated using Granger causality at two low-latitude stations, Bangalore and Hyderabad. The outcomes of this study strengthen the regional understanding and modeling of ionospheric parameters which can contribute towards the global efforts for modeling and reducing the ionospheric effects on trans-ionospheric communication and navigation. The causal inferences combined with the data-driven model can be useful in identifying the correct and informative physical quantities to improve the forecasting models. (shrink)

Drawing on Vilm Flusser's view of the relationship between humans and the computer (machines), I explore a new ontological framework for our beingin-the-world. I begin by raising critical questions regarding our endeavours and efforts to create endlessly expanding semiotic knowledge spaces based on technological innovation (e.g. Wikipedia or the Universal Electronic Library) in order to reflect on this development from a Flusserian perspective, i.e. as an anthropological challenge to designing interhuman relations. By searching for new ontological conditions for humans, (...) technology and knowledge, I want to probe into responses and new perspectives/models of knowledge sharing. How would we have to rethink the relation between semiotic telematic knowledge spaces and their structure/architecture, and the concrete given (our relationships, intersubjectivity, etc.)? What are the consequences of these findings for the macrosocial structures of encounter where knowledge exchange is a key element? Which are the epistemic models most suited to articulating a productive interdisciplinary knowledge exchange? My approach intends to weave knowledge and space, memory, technology and lived experience into an ontological fabric, and, in so doing, place humans and their communicative needs at the centre of my considerations. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Creating a Learning Space That Is Virtual and ExperientialBette E. Schneiderman (bio)The final product of the Rembrandt Project will be a Web site that is intended primarily for use by middle and high school teachers and their students. It is a celebration of Rembrandt’s work in the contexts of his time, place, and culture and all that may emanate from them. A special feature of the site is (...) the integration of art, aesthetic, and social studies education. Other articles in this issue address the rich content of the project’s work, that is, the artworks themselves, their contextual grounding, and the development of skills that maximize learning. This article looks at the creation of a learning space as a home for the development of the project. It explores issues related to learning spaces and features some of the technologies that can be used within them.The Rembrandt Project will not be a Web site that merely flattens images on a computer screen or conveys facts about Rembrandt and his oeuvre. Rather, it is a portal to a learning place with online features and opportunities for learners to have transformative experiences. Learning may occur online in electronic conversations, in opportunities to view and respond to reproductions in collections that cannot be visited in person, and in the creation and display of learners’ products. Learning is facilitated by access to a range of resources and people. Numerous announcements of activities, events, and products will be posted on the site. Some individuals will work in the space of the works themselves while others might undertake learning activities in museums, galleries, and private homes. In some cases special programs will highlight certain works and relate them to the project. Images of places in the Netherlands will also be presented with accompanying learning opportunities for those who may wish to see the paintings in person or simply ponder their influence from afar. All participants will be encouraged to share creations and reflections on the site. [End Page 38]To provide a sense of what this article is about, three cases are presented, each with two scenarios and a sample online discussion. The purpose of these cases is to draw readers into the experience of a virtual learning space before discussing contemporary learning communities, learning spaces, and technologies. The cases will show how to develop lively democratic conversation that makes communal learning possible. Participants can be of all kinds, from experts to those who simply want to learn. They can be located anywhere and participate at whatever time suits them best.Case A: Two ScenariosScenario 1: Viewing a Masterwork by RembrandtStanding before a work by Rembrandt you are drawn into its space. If you have viewed a Rembrandt in the past, recall your experience. If not, perhaps you might want to travel to a place that has one of his works or access some of his images online.1 Or you might think about a work of art that aroused your interest and prompted you to ponder its import and ask questions. Perhaps you returned to the work many times, experiencing it more deeply and differently upon each visit. What is it, specifically, about the encounter that resulted in a satisfying experience? And what changed the moment you viewed the work in a book reproduction, a slide, or a digitized image on a computer? In pursuing its purposes, the Rembrandt Project explores ways multiple skills can help maximize the experience of a wide range of works both online and off. Case A, Scenario 1, will set the stage for an experience with the work itself.Scenario 2: Viewing a Masterwork OnlineSelect a major work by Rembrandt online.2 What makes experiencing this image worthwhile, despite the fact that certain aspects cannot be captured in this flat digitized space? Upon reflecting on these scenarios, thoughts about experiencing the work may be recorded and discussed with others.3Case B: Two ScenariosScenario 1: An Experience of a LandscapeImagine wandering through an open field, tingled by a gentle breeze, warmed by the sun, refreshed by the aromas of moist grasses, mixed flowers, and the woody smells of trees. A village, visible... (shrink)

The magnetic dipole moment of the Kerr–Newman metric, defined by mass \, electrical charge \ and angular momentum \, is \, corresponding, for all values of \, to a gyromagnetic ratio \, which is also the value of the intrinsic gyromagnetic ratio of the electron, as first noted by Carter. Here, we argue that this result can be understood in terms of the particle-wave complementarity principle. For \ can only be defined at asymptotic spatial infinity, where the metric appears to (...) describe a spinning point particle, and therefore setting \, \, we necessarily have a model of the electron. From the Dirac equation we can construct a covariantly conserved four-current \ that is the source of the electromagnetic field generated by the charge \. The result \ then follows from the minimal gauge principle \ which is implicit in the formulation of the spinorial wave equation, and which can also be justified from the line action for a spin-1/2 point particle interacting with an external electromagnetic field, due to Berezin and Marinov. By contrast, analysis of the gyrogravito-magnetic effect, investigated classically by Wald and quantum mechanically by Adler et al., yields the result \ in all non-relativistic cases, which can be explained from the principle of equivalence. The results are in accord with the correspondence principle. (shrink)

After a century of cinema, accounts of this cultural form see it as divided between documentation and animation (the real and the magical). Yet the challenge that cinema presented in terms of a relocation of perception from the eye to the machine has become occluded. The shock of cinema in its earliest manifestations resided in the body of the spectator, no longer the site of primary perception, but dependent on an other (the camera, the projector) lacking in human qualities. This (...) article argues that the newly configured body–machine relationship provided by cinema became a marginalized feature of cinematic culture, an ex-centric cinema relegated to the sub-fields of science and educational film. In the mid-20th century the project surfaces spectacularly in the work of pioneering designers Charles and Ray Eames, most poignantly in their film Powers of Ten (first made in 1968, remade in 1977), a journey into the cosmos and back again into the body of a man. Bringing together discourses of space travel, cartography, physics and cinema, the film moves us towards an understanding of visual culture as an apparatus of calculated possibilities, where visualization replaces representation. If we take the Powers of Ten as a non-representational film, an ex-centric cinematic practice, we uncover non-linear and non-representational ways of apprehending the relationship between bodies and matter. This literal line of flight is one path that cinema may have taken. Its presence, however, is detectable outside of the cinema, in the software programs of electronic cartography copyrighted as Google Earth. The human body is not made virtual by its engagement with calculated visualization but is in turn part of the field of enquiry, equally porous, and definable in various scales and in different dimensions. (shrink)

This essay is interested in the relationship between electronic waste and emergent regimes of labour control operative within the global logistics industry, the task of which is to manage the movement of people and things in the interests of communication, transport and economic efficiencies. It considers the production of non-governable subjects and spaces as they figure in the relation between electronic waste, global logistics industries and biopolitical technologies of labour control.

This article analyses the way in which websites of conservation foundations organise the affective investments of viewers in animals by the use of webcams. Against a background of—often overly—general speculation on the influence of electronic media on our engagement with the world, it focuses on one particular practice where this issue is at stake. Phenomenological investigation is supplemented with ethnographic observation of user practice. It is argued that conservation websites provide caring spaces in two interrelated ways: by providing affective (...) spaces where users’ feelings are evoked, articulated and organised; and by opening up ethical space where the beauty of animals appears as an incentive to care. As an alternative to thinking of on- and off-line places as clearly delineated and of bodies and technologies as separate entities, the analysis focuses on trajectories of engagement that cut through these in various directions. In actual acts of looking and being affected, users, animals, places and technologies are intimately entwined. The article further suggests how focussing on trajectories of involvement can be developed to evaluate various websites and their user activity in relationship to clearly defined goals, e.g. conservation goals. (shrink)

The double slit experiment for a massive scalar particle is described using intuitionistic logic with quantum real numbers as the numerical values of the particle's position and momentum. The model assigns physical reality to single quantum particles. Its truth values are given open subsets of state space interpreted as the ontological conditions of a particle. Each condition determines quantum real number values for all the particle's attributes. Questions, unanswerable in the standard theories, concerning the behaviour of single particles in (...) the experiment are answered. (shrink)

In this article, we discuss a project that was co-authored by a storyteller and a visual artist in the metaverse of Second Life in 2009. The aim of the project was to create a storytelling space that would be used by its visitors to create their own unique narratives, as well as their own original performances, all of which would take their trajectories by being immersed in a virtual architecture/landscape, through avatar costumes and a substantial library of dramatic poses (...) and animations that were put at their disposal by the authors at the location of the event. The project wove together several concepts: these are Roy Ascott’s tenets of ‘distributed authorship’ and ‘participatory poesis’, which were brought together with a term that was coined by Axel Bruns to describe novel collaborative electronic forms of creative output in which the roles of the ‘user’ and the ‘producer’ have become merged, manifesting as a novel type of online behaviour that the author defines as ‘Produsage’. These primary concepts were substantiated by research that combined the fields of performance art, storytelling, memory arts and the usage of mnemonic devices, including the Renaissance notion of the ‘memory theatre’ with Cyberpsychology, particularly in relation to avatar studies. (shrink)

While philosophers generally agree that there can be no direct experience of the foreign consciousness, Simone de Beauvoir argues that literature makes it possible for us to enter the Other’s world. I will investigate the ways in which the position of the other and the position of the self-become one in the literary experience. Using phenomenology of the body as my point of departure, and analyzing the differences and convergences between verbal and literary communication acts, I will argue that the (...) text takes the place of the “inner speech” in the reading act. Consequently, the literary text acquires a kind of ownness, while it also appears as spoken by the other and having a reader-independent existence as a physical or electronic object. Literature does not provide us with the same possibilities of reciprocity, spatial perception and role-reversals as face-to-face encounters do; yet the very absence of the embodied other facilitates the adaption of his or her position and world as “one’s own”. (shrink)

Rapid advances in biology, electronics, computer and data science have turned invention into products, changing the lives and lifestyles of millions of people around the world. This mini-review will describe some remarkable progress made over the last 10 years which serves both healthy individuals and patients alike. With a forward looking lens towards long term space missions and the potential colonisation of the Moon and Mars, we discuss three technologies under development. We conclude with a distant looking perspective on (...) the prospect of gene mediated human enhancement and highlight the importance of aligning benefit for people on Earth with goals for future space missions and the need to establish regulatory and ethical guidelines. (shrink)

Multicarrier systems, such as car batteries and semiconductors, have surprisingly complex transport properties. Even for steady-state transport, one can find counterexamples to standard assumptions about local electroneutrality, constancy in space of the electric field, linearity in space of the voltage, and the relationship between dissipation, voltage, and current. Moreover, unless recombination processes occur, boundaries impose conditions that can disturb the response far into the bulk to remove memory of the boundaries. Because the demands of the chemical reactions at (...) the electrodes cannot be satisfied by diffusion alone, car batteries are electrically active even when they are neither charging nor discharging. We offer practical advice on battery care for bike-riders, say, who only occasionally use their cars. For semiconductors, recombination does occur, which in transport enables partial currents to adjust from their surface to their bulk values. For mixed ionic electronic conductors, bulk recombination may be essential to an understanding of “blocking electrodes.” The voltage associated with both current-producing and non-current-producing surface reactions provides a natural explanation for the bioelectric fields observed during root and other growth processes. (shrink)