Forecast analysis of optical waveguide bus performance

Elements to be considered in the design of a data bus include: architecture; data rate; modulation, encoding, detection; power distribution requirements; protocol, work structure; bus reliability, maintainability; interterminal transmission medium; cost; and others specific to application. Fiber- optic data bus considerations for a 32 port transmissive star architecture, are discussed in a tutorial format. General optical-waveguide bus concepts, are reviewed. The electrical and optical performance of a 32 port transmissive star bus, and the effects of temperature on the performance of optical-waveguide buses are examined. A bibliography of pertinent references and the bus receiver test results are included

Liquid droplets act as "compass needles" for the stresses in a deformable membrane

We examine the shape of droplets atop deformable thin elastomeric films prepared with an anisotropic tension. As the droplets generate a deformation in the taut film through capillary forces, they assume a shape that is elongated along the high tension direction. By measuring the contact line profile, the tension in the membrane can be completely determined. Minimal theoretical arguments lead to predictions for the droplet shape and membrane deformation that are in excellent agreement with the data. On the whole, the results demonstrate that droplets can be used as probes to map out the stress field in a membrane

High-dimensional states of light with full control of transverse path and OAM degrees of freedom

We present here a compact scheme for the generation of high-dimensional states of light encoded in the transverse path variable of photons that carry orbital angular momentum. We use a programmable spatial light modulator in phase configuration to create correlations between these two spatial degrees of freedom. With our setup we are able to control, independently, the relative phases and amplitudes of the path superposition in addition to the topological charge of each path. Moreover, we engineer correlations that emulate bipartite quantum states of dimensions $d\times m$. Experimental results from the characterization of different generated states of dimensions up to $9\times 5$ are in excellent agreement with the numerical simulations. Fidelity with the target state is, for all cases, above $95\%$.Comment: minor change

Factors of academic stress: Do they impact English academic performance?

This study investigated the college students’ level of academic performance and determined the impact of academic stress on their English academic performance. This employed a descriptive-exploratory research design with Exploratory Factor Analysis (EFA) and correlation analysis (Pearson r) as main analyses using statistical software. The result suggested that the students (N=250) have a moderate level of stress. Likewise, seven factors were generated through EFA but were reduced to four factors using parallel analysis, the factors are perceived personal stress, classroom stress, performance stress, and time management stress. In the correlation analysis, it was found out that perceived personal stress, classroom stress, and performance stress are significantly correlated except for time management stress. Moreover, these factors were found to have no significant relationship with the English grades of the students. With this result, it is concluded that despite having a moderate level of academic stress, students were able to manage them by using a plethora of coping mechanisms available. The institutions should offer prevention and intervention services that directly address the academic stress of the students to ensure academic success

Non-traumatic chronic shoulder pain is not associated with changes in rotator cuff interval tendon thickness

To determine whether the thickness of the rotator interval tendons is different when comparing both symptomatic and non-symptomatic sides in people with chronic shoulder pain, and to those free of pain. Furthermore, to calculate the level of association between the rotator interval tendon thicknesses and perceived shoulder pain-function. A cross-sectional, observational study. The supraspinatus, subscapularis and biceps brachii tendon thickness of sixty two patients with chronic shoulder pain were determined from standardized ultrasonography measures performed on both shoulders, whereas only the dominant arm was measured for the control subjects. Supraspinatus, subscapularis and biceps brachii tendon thickness was comparable between sides in the symptomatic group and was also comparable between the symptomatic and asymptomatic participants. In addition, the correlation between the tendon thickness and shoulder pain-function was non-significant. Tendon thickness was unaltered in people with chronic shoulder pain. These findings do not rule out the possibility that other changes in the tendon are present such as changes in the elastic properties and cell population and this should be explored in future studies

Reanalysis of the FEROS observations of HIP 11952

Aims. We reanalyze FEROS observations of the star HIP 11952 to reassess the existence of the proposed planetary system. Methods. The radial velocity of the spectra were measured by cross-correlating the observed spectrum with a synthetic template. We also analyzed a large dataset of FEROS and HARPS archival data of the calibrator HD 10700 spanning over more than five years. We compared the barycentric velocities computed by the FEROS and HARPS pipelines. Results. The barycentric correction of the FEROS-DRS pipeline was found to be inaccurate and to introduce an artificial one-year period with a semi-amplitude of 62 m/s. Thus the reanalysis of the FEROS data does not support the existence of planets around HIP 11952.Comment: 7 pages, 8 figures, 1 tabl

The role of building information modeling in a project-based course for integration of design and construction at WPI [2018]

En el entorno competitivo de la actualidad, la Arquitectura, Ingeniería, e Industria de la construcción (A / E / C por sus siglas en inglés: Architecture, Engineering, and Construction), los servicios profesionales que compiten en el mercado para satisfacer las necesidades de los propietarios en cuanto a calidad, eficiencia, costos, y control horario. Para satisfacer estas necesidades, la industria está experimentando cambios fundamentales basados en la integración de las funciones realizadas por las empresas. Para atender las necesidades educativas derivadas de una mayor integración en la industria, en 1993 el Departamento de Ingeniería Civil y Ambiental en el Instituto Politécnico de Worcester (WPI) implementó el Programa Maestro de obras. Un curso de postgrado a nivel de la CE 535 Integración de Diseño y Construcción se desarrolló y se ofreció por primera vez durante el semestre de otoño de 1995 como parte del Programa del Master Builder. Con los años, los dos instructores de clase se han adaptado a los principios de la ingeniería de valor como un modelo pedagógico para entregar el material del curso y establecer un marco formal para apoyar el análisis racional y la toma de decisiones para la integración de diseño, construcción y planificación financiera. Ahora que los estudiantes IPM son cada vez más expuestos al uso de software 3D-OOP programación orientada a objetos y al concepto Building Information Modeling (BIM); el CE 535 se está revisando para exigir a los estudiantes a la utilización de las herramientas BIM y conceptos como parte integral de su desarrollo del proyecto. Para lograr esto, una parte de los laboratorios se dedicarán ahora a facilitar el aprendizaje de los estudiantes de esos elementos BIM que son necesarios para el desarrollo de su proyecto a largo plazo. Este artículo presenta la elaboración de un tutorial que es desarrollado principalmente por el tercer autor durante el verano del 2010. Este tutorial tiene por objeto guiar a los estudiantes en el uso de Autodesk Revit en su proyecto a largo plazo, ya que poco a poco aplicara su experiencia, respondiendo a una solicitud de propuesta para el diseño y construcción de un estacionamiento situado en Lexington Street, Worcester, MA