Excitations and S-matrix for su(3) spin chain combining 3{3} and ${3^{*}}

The associated Hamiltonian for a su(3) spin chain combining ${3}$ and ${3^{*}}$ representations is calculated. The ansatz equations for this chain are obtained and solved in the thermodynamic limit, and the ground state and excitations are described. Thus, relations between the number of roots and the number of holes in each level have been found . The excited states are characterized by means of these quantum numbers. Finally, the exact S matrix for a state with two holes is found.Comment: 17 pages, plaintex, harvmac (to be published in J. of Phys. A

Estudio en un caso particular de osteopatía craneomandibular en un West Highland White Terrier

Se realiza el estudio de un caso de osteopatía craneomandibular en un West Highland White Terrier cuya característica más evidente consistió en la proliferación ósea mandibular. Tras un tratamiento paliativo, el proceso sigue su curso evolutivo, ya que hasta el momento no existe terapia curativa.We realized a study of a Craneomandibular Ostheopathy in a West Highland White Terrier dog which main characteristic consisted in a proliferation process of the jaw. Following a palliative treatment, the process continues its evolutional course and sofar no curative therapy is known

Three-dimensional flow structure and bed morphology in large elongate meander loops with different outer bank roughness characteristics

© 2016. American Geophysical Union. All Rights Reserved. Few studies have examined the three-dimensional flow structure and bed morphology within elongate loops of large meandering channels. The present study focuses on the spatial patterns of three-dimensional flow structure and bed morphology within two elongate meander loops and examines how differences in outer bank roughness influence near-bank flow characteristics. Three-dimensional velocities were measured during two different events—a near-bankfull flow and an overbank event. Detailed data on channel bathymetry and bed form geometry were obtained during a near-bankfull event. Flow structure within the loops is characterized by strong topographic steering by the point bar, by the development of helical motion associated with flow curvature, and by acceleration of flow where bedrock is exposed along the outer bank. Near-bank velocities during the overbank event are less than those for the near-bankfull flow, highlighting the strong influence of the point bar on redistribution of mass and momentum of the flow at subbankfull stages. Multiple outer bank pools are evident within the elongate meander loop with low outer bank roughness, but are not present in the loop with high outer bank roughness, which may reflect the influence of abundant large woody debris on near-bank velocity characteristics. The positions of pools within both loops can be linked to spatial variations in planform curvature. The findings indicate that flow structure and bed morphology in these large elongate loops is similar to that in small elongate loops, but differs somewhat from flow structure and bed morphology reported for experimental elongate loops

Simulation of Suspensions, Torsion Bars, and Fifth Wheel for Semitrailers Using Finite Elements

The objective of this paper is the simulation of some different types of elements for semitrailers, like the suspension, both mechanical with springs and pneumatic with a spring anddiapresses; other parts like the wheels, the torsion bars, the fifth wheel and the suspension of the tractor unit have also been simulated. Then, the numerical simplified FE model of these elements that allows simulating the real behavior of the suspension to apply adequately the boundary conditions of a heavy vehicle has been obtained for a structural simulation using numerical tools with a good accuracy of the local and global behavior of the vehicle

A forced migration due to covid19 from a face-to-face university education service to a total online learning management system support: UDELAS-Panamá study case

The Covid-19 pandemic forced the Specialized University of the Americas (UDELAS, Panamá) to transform their educational service from almost 100% face-to-face to 100% virtual in approximately three weeks. This change involved creating 2,500 virtual courses and integrating nearly 9,000 students and 1,200 teachers into them. The research question to answer: Is it possible to schedule a proposed Learning Management System (LMS) tested on the go, in two effective months to institutionally can adopting latter an effective teaching-learning process total online? For testing which LMS online service to choose, two types of well-known LMS were selected: Moodle, which is an open source LMS centralized with a complete control over its components and services, and Google's Classroom, as a decentralized LMS running essentially in the cloud, which is conducive to a user/personal management, avoiding in the short term, to attend many hardware and software technical issues. Under a methodological process alike Agile style, the expansion of technological capabilities in the Moodle implementation took three weeks. In parallel, to implement Classroom, 12,000 institutional Google accounts were generated using the G Suite for Education license (in agreement with Google Mexico chapter). An institutional email account was established as the digital identity of professors and students, throughout they can access both LMSs. In addition, a group of the professors chose to combine applications instead of using Moodle or Classroom alone, it was called the combined option

Can we detect internal moisture content in hardened concrete with an infrared camera?

The main goal of this paper was to assess the ability of infrared thermography to detect non-superficial moisture content in concrete elements. For this purpose, a commercial camera (Flir i5) was used and firstly its capacities and technical limitations were analyzed by comparing it with other commonly commercialized. Secondly, the experiments were undertaken using a concrete specimen (water/cement=0.5) and water under a pressure of 500 kPa was injected over 72 hours into one side of the specimen. The specimen was then left at room temperature (20ºC) for 24 hours, so the surface moisture disappeared. Prior to the images acquisition, the specimen surface was heated by a lamp located at a distance of 0.68 m from the central point of the specimen. In this way, two areas (dry and injected) to be registered would receive the same energy, since they were equidistant from the heating source. The first record was acquired before heating the specimen and then, the heating process was interrupted every 10 minutes to perform the infrared images acquisitions. Finally, by means of the destructive test, the average water penetration depth was assessed to be 3 cm. The infrared images acquired before heating the specimen showed a small temperature variation as a result of the presence of water, 16,3 ºC in the dry area and 15,8 ºC in the injected area. However, after the heating, due to the greater specific heat of water, the injected part achieved a temperature 4º C lower than the symmetrical dry area. This result was very interesting because, in the initial moment (before heating) the surface specimen was dry, but there was a wet area inside of the specimen that was not visually identifiable. Nevertheless, by means of infrared imaging an indicator was obtained that allowed to detect the presence of this internal moisture content