It has been proposed some time ago that the large N−limit can be understood as a “classical limit”, where commutators in some sense approach the corresponding Poisson brackets. We discuss this in the light of some recent numerical results for an SU(N) gauge model, which do not agree with this “classicality” of the large N−limit. The world sheet becomes very crumpled. We speculate that this effe...

We report five cases of unexplained retinal hemorrhage after 23-gauge sutureless vitrectomy. A 23-gauge sutureless vitrectomy was performed for four cases of macular holes (MH) and one case of macular hole retinal detachment (MHRD). Retinal hemorrhages were observed on the first day after surgery and disappeared within several months without leaving any recognizable damage. We speculate that th...

Abstract The inclusion of matter fields in spherically symmetric loop quantum gravity has proved problematic at the level implementing constraint algebra including Hamiltonian constraint. Here we consider system with introduction a clock. Using abelianizaton technique introduced previous papers case coupled to matter, can be gauge fixed and rewritten terms restricted set dynamical variables tha...

Following the popularity of smart phones and the development of mobile Internet, the demands for accurate indoor positioning have grown rapidly in recent years. Previous indoor positioning methods focused on plane locations on a floor and did not provide accurate floor positioning. In this paper, we propose a method that uses multiple barometers as references for the floor positioning of smart ...

Coastal sea level variation as an indicator of climate change is extremely important due to its large socioeconomic and environmental impacts. The ground-based global navigation satellite system (GNSS)-reflectometry (GNSS-R) becoming a reliable alternative for surface altimetry. We investigate the impact antenna polarization orientation on GNSS-R altimetric performance at different carrier freq...

Abstract This paper studies hamiltonization of nonholonomic systems using geometric tools, building on [1] , [5] . The main novelty in this is the use symmetries and suitable first integrals system to explicitly define a new bracket reduced space that codifies dynamics carries, additionally, an almost symplectic foliation (determined by common level sets integrals); particular cases interest, P...

We construct ternary self-distributive (TSD) objects from compositions of binary Lie algebras, 3-Lie algebras and, in particular, Nambu-Lie algebras. show that the structures obtained satisfy an invertibility property resembling racks. prove these give rise to Yang-Baxter operators tensor product base vector space upon defining suitable twisting isomorphisms, we obtain representations infinite ...

The close interplay between geometry, topology and algebra turned out to be a most crucial point in the analysis of low dimensional field theories. This is particularly true for the large class of topological and almost topological two-dimensional field theories which can be treated comprehensively in the framework of Poisson-σ models. Examples are provided by pure YangMills and gravity theorie...

This paper investigates the capability of GNSS aided smart sensor network positioning based on Wireless Local Area Network (WLAN) signals incorporating access points, to monitor 3D deformation associated with volcanic activity and other comparable hazardous events. While a small number of GNSS receivers provide the coordinate and time references, low-cost low-power wireless sensor nodes with ra...