The significant roles played by eunuchs (castrated slaves) in Rasūlid Yemen have thus far escaped scholarly scrutiny. A systematic study of the historiographic and biographical writings of ʿAlī b. al-Ḥasan al-Khazrajī, chronicler of the Rasūlid court at the turn of the 9th/15th century, reveals that eunuchs figured prominently both in the highest ranks of the dynasty’s political, administrative, and military hierarchy, as well as in the most intimate realms of royal households. The author, however, remains silent on the origins of (...) these men and on the capture, castration, and deracination they suffered as young boys. In order to reconstruct the slave trading practices that supplied the Rasūlids with eunuchs, a late 7th/13th-century collection of administrative documents known as Nūr al-maʿārif shall be drawn upon. This source names an African export hub from which slaves were shipped across the Red Sea to Yemen, lists prices and taxes paid for eunuchs, and reveals that the Rasūlids actively interfered in the Yemeni slave trade in order to secure the most desirable eunuchs for themselves. Taken together, these narrative and administrative sources shed light on the eunuch institution in Rasūlid Yemen and on its role in sustaining the dynasty. (shrink)

We investigate and develop further two models, the GRW model and the K model, in which the Schrödinger evolution of the wave function is spontaneously and repeatedly interrupted by random, approximate localizations, also called “self-reductions” below. In these models the center of mass of a macroscopic solid body is well localized even if one disregards the interactions with the environment. The motion of the body shows a small departure from the classical motion. We discuss the prospects and the difficulties of (...) observing this anomaly. As far a the influence of the surroundings on submacroscopic objects (like dust particles) is concerned, we show that the estimates obtained recently in the theory of continuous measurements and in the K model are compatible. Also, we elaborate upon the relationship between the models. Firstly, borrowing a line of thought from the K model, we find the transition region between macroscopic and microscopic behaviors in the GRW model. Secondly, we refine the propagation rule of the wave function in the K model with the help of the time-evolution equation proposed in the GRW model. (shrink)

In the existing expositions of the Károlyházy model, quantum mechanical uncertainties are mimicked by classical spreads. It is shown how to express those uncertainties through entities of the future unified theory of general relativity and quantum theory.

It is shown in the present note that the degree of the complexity of the time-reading process of the Salecker–Wigner clock depends on the size of the clock. This dependence leads to a relation between the size and the accuracy of the clock, and suggests a precise optimal value for the size in agreement with the order of magnitude value established by Salecker and Wigner.

In this commentary I discuss the role of types of knowledge and conceptual structures in lexical representation, revealing the explanatory potential of frame-based knowledge. Although frame-based lexical semantics is not alien to the theoretical model outlined in Jackendoff's conceptual semantics, testing its relevance to the analysis of the lexical evidence presented in his book has been left out of consideration.

The meaning of material artifacts that remain unchanged in form can change through spatial references and through changes in context. In this volume, spatial, historical, topographical, and discursive contextual changes are analyzed in case studies, and their meanings and intersections are critically reflected upon.

Este estudio tuvo como objetivo caracterizar investigaciones sobre representaciones sociales de docentes y estudiantes acerca de la escritura en la educación superior. La revisión sistemática se efectuó siguiendo la metodología propuesta por la Declaración PRISMA. La búsqueda, que fue realizada en las bases de datos WOS, Scopus, Scielo y ERIC, permitió identificar 20 artículos entre los que predomina el enfoque cualitativo. Como elementos recurrentes se destacan la necesidad de que en la universidad se enseñe explícitamente a escribir y la persistencia (...) de representaciones, que vinculan la escritura con la evaluación. (shrink)

Part I Introduction -/- Passion at a Distance (Don Howard) -/- Part II Philosophy, Methodology and History -/- Balancing Necessity and Fallibilism: Charles Sanders Peirce on the Status of Mathematics and its Intersection with the Inquiry into Nature (Ronald Anderson) -/- Newton’s Methodology (William Harper) -/- Whitehead’s Philosophy and Quantum Mechanics (QM): A Tribute to Abner Shimony (Shimon Malin) -/- Bohr and the Photon (John Stachel) -/- Part III Bell’s Theorem and Nonlocality A. Theory -/- Extending the Concept of an (...) “Element of Reality” to Work with Inefficient Detectors (Daniel M. Greenberger) -/- A General Proof of Nonlocality without Inequalities for Bipartite States (GianCarlo Ghirardi and Luca Marinatto) -/- On the Separability of Physical Systems (Jon P. Jarrett) -/- Bell Inequalities: Many Questions, a Few Answers (Nicolas Gisin) -/- B. Experiment -/- Do Experimental Violations of Bell Inequalities Require a Nonlocal Interpretation of Quantum Mechanics? II: Analysis a la Bell (Edward S. Fry, Xinmei Qu, and Marlan O. Scully) -/- The Physics of 2 = 1 + 1 (Yanhua Shih) -/- Part IV Probability, Uncertainty, and Stochastic Modifications of Quantum Mechanics -/- Interpretations of Probability in Quantum Mechanics: A Case of “Experimental Metaphysics” (Geoffrey Hellman) -/- “No Information Without Disturbance”: Quantum Limitations of Measurement (Paul Busch) -/- How Stands Collapse II (Philip Pearle) -/- Is There a Relation Between the Breakdown of the Superposition Principle and an Indeterminacy in the Structure of the Einsteinian Space-Time? (Andor Frenkel) -/- Indistinguishability or Stochastic Dependence? (D. Costantini and U. Garibaldi) -/- Part V Relativity -/- Plane Geometry in Spacetime (N. David Mermin) -/- The Transient nows (Steven F. Savitt) -/- Quantum in Gravity? (Michael Horne) -/- A Proposed Test of the Local Causality of Spacetime (Adrian Kent) -/- Quantum Gravity Computers: On the Theory of Computation with Indefinite Causal Structure (Lucien Hardy) -/- “Definability,” “Conventionality,” and Simultaneity in Einstein–Minkowski Space-Time (Howard Stein) -/- Part VI Concluding Words -/- Bistro Banter: A Dialogue with Abner Shimony and Lee Smolin -/- Unfinished Work: A Bequest (Abner Shimony) -/- Bibliography of Abner Shimony. (shrink)