Matching the BPS Spectra of Heterotic - Type I - Type I' Strings

We give a detailed discussion of the matching of the BPS states of heterotic, type I and type I' theories in d=9 for general backgrounds. This allows us to explicitly identify these (composite) brane states in the type I' theory that lead to gauge symmetry enhancement at critical points in moduli space. An example is the enhancement of $SO(16)\times SO(16)$ to $E_8\times E_8$.Comment: 11 pages; minor typos in eq. (3), (4) and on page 9 have been corrected; two footnotes taking into account additional references have been added; version to appear in Physics Letters

Numerical determination of entanglement entropy for a sphere

We apply Srednicki's regularization to extract the logarithmic term in the entanglement entropy produced by tracing out a real, massless, scalar field inside a three dimensional sphere in 3+1 flat spacetime. We find numerically that the coefficient of the logarithm is -1/90 to 0.2 percent accuracy, in agreement with an existing analytical result

Fostering Reflective Teaching: Using the Student Participation Observation Tool (SPOT) to Promote Active Instructional Approaches in STEM

The Student Participation Observation Tool (SPOT) is a web-based classroom observation protocol developed for higher education STEM courses and based on research on evidence-based practices. The low-inference and objective nature of the SPOT and visual outputs make it an optimal tool for teaching professional development. The SPOT allows novice users to use data from their own classes to reflect on, and make data-driven changes to, their teaching practices. In particular, the SPOT was designed to present faculty with objective data related to their use of active instructional approaches, be easy for practitioners to use, and provide data outputs that are illustrative and non-evaluative. Use of the SPOT in a workshop series revealed that these design features allow faculty to collect reliable observation data with minimal training. Furthermore, SPOT data promoted faculty reflection on teaching practice and motivated faculty to make changes to their teaching that aligned with more learner-centered practices. Beyond teaching professional development, we suggest how the SPOT may be used to increase the usefulness of peer observation for teaching evaluation

Perdas na colheita na cultura da soja.

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Characterization of the TruSense S310 Laser Range System for Contact-less Measurement of Liquid Levels in Large-Volume Neutrino Detectors

Neutrino experiments often use large volumes of water, organic scintillators or noble liquids as active detection material. Due to the large hydrostatic and buoyancy forces involved, precise knowledge of the liquid levels inside the detector tank are mandatory. Here we present the main characteristics of the TruSense S310 Laser Range System. Level measurements can be performed without direct contact to the liquid and through a gas-proof acrylic window, thus preserving the strict radiopurity and chemical requirements of the target liquid. We report the results of a suit of laboratory experiments for short-term precision tests ($\pm$5\,mm) and long-term stability studies. Moreover, we demonstrate that the infrared laser can be used while standard bi-alkali PMTs are operational. We discuss the mechanical layout and integration of the system in the OSIRIS pre-detector that will monitor the radiopurity of the liquid scintillator for the large-volume neutrino experiment JUNO

Preparo do solo pós-colheita do arroz irrigado.

bitstream/CPACT-2010/13008/1/preparo-do-solo.pd