Infrared attenuation of thallium bromo-iodide fibers

Analysis of attenuation measurements in the near infrared of an unclad fiber of Thallium Bromo-Iodide (Th(Br,I)), a polycrystalline thallium halide, is presented. A general overview is given of the properties of fiber optics. Two groups of attenuation measurements, for the region 1.2 to 3.4 and for 3 to 11 microns, respectively, are presented, analyzed, and compared with those of two other groups of researchers

Etude des variations de l'indice micronaire, de la maturité et de la finesse de la fibre de trois variétés de cotonnier dans les essais régionaux campagne 1984-1985 en Côte d'Ivoire

Les variations de l'indice micronaire des cotons des trois variétés étudiées en fonction des localités sont expliquées de façon satisfaisante par les variations de la maturité des fibres. Elles sont totalement expliquées par les deux caractéristiques à savoir : finesse standard et maturit

Expansion of neopterin and beta2-microglobulin in cerebrospinal fluid reaches maximum levels early and late in the course of human immunodeficiency virus infection

Inhaltsverzeichnis fehlt

Towards Physical Hybrid Systems

Some hybrid systems models are unsafe for mathematically correct but physically unrealistic reasons. For example, mathematical models can classify a system as being unsafe on a set that is too small to have physical importance. In particular, differences in measure zero sets in models of cyber-physical systems (CPS) have significant mathematical impact on the mathematical safety of these models even though differences on measure zero sets have no tangible physical effect in a real system. We develop the concept of "physical hybrid systems" (PHS) to help reunite mathematical models with physical reality. We modify a hybrid systems logic (differential temporal dynamic logic) by adding a first-class operator to elide distinctions on measure zero sets of time within CPS models. This approach facilitates modeling since it admits the verification of a wider class of models, including some physically realistic models that would otherwise be classified as mathematically unsafe. We also develop a proof calculus to help with the verification of PHS.Comment: CADE 201

Teleportation-based realization of an optical quantum two-qubit entangling gate

In recent years, there has been heightened interest in quantum teleportation, which allows for the transfer of unknown quantum states over arbitrary distances. Quantum teleportation not only serves as an essential ingredient in long-distance quantum communication, but also provides enabling technologies for practical quantum computation. Of particular interest is the scheme proposed by Gottesman and Chuang [Nature \textbf{402}, 390 (1999)], showing that quantum gates can be implemented by teleporting qubits with the help of some special entangled states. Therefore, the construction of a quantum computer can be simply based on some multi-particle entangled states, Bell state measurements and single-qubit operations. The feasibility of this scheme relaxes experimental constraints on realizing universal quantum computation. Using two different methods we demonstrate the smallest non-trivial module in such a scheme---a teleportation-based quantum entangling gate for two different photonic qubits. One uses a high-fidelity six-photon interferometer to realize controlled-NOT gates and the other uses four-photon hyper-entanglement to realize controlled-Phase gates. The results clearly demonstrate the working principles and the entangling capability of the gates. Our experiment represents an important step towards the realization of practical quantum computers and could lead to many further applications in linear optics quantum information processing.Comment: 10 pages, 6 figure

Historicism

As the rebuilding of Berlin’s eighteenth-century Stadtschloss nears completion, German History turns its attention to the phenomenon of historicism: to the recreation of historical artefacts and practices (sometimes at astonishing expense). Historicism reached its high point in the nineteenth century, when individuals and communities turned to the medieval period to address some of the challenges of modernization. But the urge to revive extended back into the medieval period itself and continues into the twenty-first century. What motivated and what continues to motivate such recreations? As a theme, historicism provides an opportunity for fruitful dialogue between premodern and modern scholars. It also challenges us as historians to consider the value of revivals, whether produced by Berlin politicians, by Hollywood filmmakers or by medieval re-enactors. What happens — or what should happen — when academic scholarship encounters..