Aristotle, Ioannes Gennadios, and the idea of a scholarly library

[Δε διατίθεται περίληψη / no abstract available

Aristotle, Ioannes Gennadios, and the idea of a scholarly library

[Δε διατίθεται περίληψη / no abstract available

Pressure dependence of the magnetization in the ferromagnetic superconductor UGe_2

The recent discovery that superconductivity occurs in several clean itinerant ferromagnets close to low temperature magnetic instabilities naturally invites an interpretation based on a proximity to quantum criticality. Here we report measurements of the pressure dependence of the low temperature magnetisation in one of these materials, UGe_2. Our results show that both of the magnetic transitions observed in this material as a function of pressure are first order transitions and do not therefore correspond to quantum critical points. Further we find that the known pressure dependence of the superconducting transition is not reflected in the pressure dependence of the static susceptibility. This demonstrates that the spectrum of excitations giving superconductivity is not that normally associated with a proximity to quantum criticality in weak itinerant ferromagnets. In contrast our data suggest that instead the pairing spectrum might be related to a sharp spike in the electronic density of states that also drives one of the magnetic transitions.Comment: to appear in Phys. Rev. Let

Solvable Examples of Drift and Diffusion of Ions in Non-uniform Electric Fields

The drift and diffusion of a cloud of ions in a fluid are distorted by an inhomogeneous electric field. If the electric field carries the center of the distribution in a straight line and the field configuration is suitably symmetric, the distortion can be calculated analytically. We examine the specific examples of fields with cylindrical and spherical symmetry in detail assuming the ion distributions to be of a generally Gaussian form. The effects of differing diffusion coefficients in the transverse and longitudinal directions are included

Putting theory into practice: designing a curriculum according to self-determination theory

Building on existing research into the affective domain in legal education, volition and self-determination theory (SDT), we explain how to categorise student motivation types and design a curriculum which meets and supports, or at least does not undermine or damage, students' intrinsic or extrinsic motivations. This categorisation process allows the curriculum designer to obtain a fresh insight into student engagement, particularly by appreciating how to enhance the active forms of extrinsic student motivation, which leads students to internalize their goals, take over the responsibility for their learning and develop a strong sense of value for their choices. That insight, coupled with an appreciation of SDT's identification of the three human motivational needs (autonomy, competence and relatedness), allows the curriculum designer consciously to address learning, teaching and assessment at a macro- and micro-design level. As one method of approaching curriculum design, we show how to change the learning culture; the environment enables a stronger understanding of students’ behaviours, volition and motivation, creating new ways for the students to internalise their extrinsic motivation (own their learning), leading to fully self-determined actions

One dimensional chain of quantum molecule motors as a mathematical physics model for muscle fibre

A quantum chain model of many molecule motors is proposed as a mathematical physics theory on the microscopic modeling of classical force-velocity relation and tension transients of muscle fibre. We proposed quantum many-particle Hamiltonian to predict the force-velocity relation for the slow release of muscle fibre which has no empirical relation yet, it is much more complicate than hyperbolic relation. Using the same Hamiltonian, we predicted the mathematical force-velocity relation when the muscle is stimulated by alternative electric current. The discrepancy between input electric frequency and the muscle oscillation frequency has a physical understanding by Doppler effect in this quantum chain model. Further more, we apply quantum physics phenomena to explore the tension time course of cardiac muscle and insect flight muscle. Most of the experimental tension transients curves found their correspondence in the theoretical output of quantum two-level and three-level model. Mathematically modeling electric stimulus as photons exciting a quantum three-level particle reproduced most tension transient curves of water bug Lethocerus Maximus.Comment: 16 pages, 12 figures, Arguments are adde