Utilization of Birefringent Fiber as Sensor of Temperature Field Disturbance

The paper deals with utilization of induced birefringence sensitivity to temperature field in birefringent optical fibers. The propagating optical wave and optical fibers are described by means of coherency and Jones matrices, which are decomposed into unitary matrix and spin matrices. The development of polarization caused by temperature field is interpreted on the Poincare sphere by means of MATLAB® environment. The temperature sensitivity of Panda and bow-tie fiber has been measured for circular polarization excitation. Curves of intensity fluctuation caused by the temperature dependence are presented

Magnetohydrodynamic equilibria of a cylindrical plasma with poloidal mass flow and arbitrary cross section shape

The equilibrium of a cylindrical plasma with purely poloidal mass flow and cross section of arbitrary shape is investigated within the framework of the ideal MHD theory. For the system under consideration it is shown that only incompressible flows are possible and, conscequently, the general two dimensional flow equilibrium equations reduce to a single second-order quasilinear partial differential equation for the poloidal magnetic flux function $\psi$, in which four profile functionals of $\psi$ appear. Apart from a singularity occuring when the modulus of Mach number associated with the Alfv\'en velocity for the poloidal magnetic field is unity, this equation is always elliptic and permits the construction of several classes of analytic solutions. Specific exact equlibria for a plasma confined within a perfectly conducting circular cylindrical boundary and having i) a flat current density and ii) a peaked current density are obtained and studied.Comment: Accepted to Plasma Physics & Controlled Fusion, 14 pages, revte

On the geometry of C^3/D_27 and del Pezzo surfaces

We clarify some aspects of the geometry of a resolution of the orbifold X = C3/D_27, the noncompact complex manifold underlying the brane quiver standard model recently proposed by Verlinde and Wijnholt. We explicitly realize a map between X and the total space of the canonical bundle over a degree 1 quasi del Pezzo surface, thus defining a desingularization of X. Our analysis relys essentially on the relationship existing between the normalizer group of D_27 and the Hessian group and on the study of the behaviour of the Hesse pencil of plane cubic curves under the quotient.Comment: 23 pages, 5 figures, 2 tables. JHEP style. Added references. Corrected typos. Revised introduction, results unchanged

Hydrospatial… A Global Movement !

In two previous articles published as Notes in the International Hydrographic Review (IHR) No.25 and No.23 the topics of “What’s Hydrospatial?” (Hains, 2020) and « So… What is Hydrospatial ? » (Hains & al, 2021), it was suggested to use the new term Hydrospatial as the expansion of hydrography in the context of a sustainable growing Blue Economy. The authors continue to stress and will continue to reaffirm that Hydrospatial is not a replacement for hydrography, it is broader and an expansion of it beyond the realm of sea navigation. The authors have no intention to have hydrography being replaced as a term. The term Hydrospatial is intended to provide a refinement of the concept of Geospatial in the context of the aquatic environment. “Hydrography” is, and will remain, the foundation of the Hydrospatial and continues to be a very relevant term and field of science. More articles and information have been published to clarify Hydrospatial and to define it better. In the momentum of exploring the benefits of using the term Hydrospatial to better address geospatial in the water, a global movement of volunteers has been established to generate discussion and advocate the applications of the term Hydrospatial, which could be simply described as the blue geospatial environment

Neutrino physics at very high energies

NAL presents the opportunity to expand our knowledge of neutrino interactions from energies of less than 10 GeV up to more than 300 GeV. We propose an exploratory experiment which is designed to emphasize the physics of very high energy interactions ({approx}300 GeV)