Polynomial–exponential equations and Zilber's conjecture

Assuming Schanuel's conjecture, we prove that any polynomial–exponential equation in one variable must have a solution that is transcendental over a given finitely generated field. With the help of some recent results in Diophantine geometry, we obtain the result by proving (unconditionally) that certain polynomial–exponential equations have only finitely many rational solutions. This answers affirmatively a question of David Marker, who asked, and proved in the case of algebraic coefficients, whether at least the one variable case of Zilber's strong exponential-algebraic closedness conjecture can be reduced to Schanuel's conjecture

Many-body interactions and melting of colloidal crystals

We study the melting behavior of charged colloidal crystals, using a simulation technique that combines a continuous mean-field Poisson-Boltzmann description for the microscopic electrolyte ions with a Brownian-dynamics simulation for the mesoscopic colloids. This technique ensures that many-body interactions between the colloids are fully taken into account, and thus allows us to investigate how many-body interactions affect the solid-liquid phase behavior of charged colloids. Using the Lindemann criterion, we determine the melting line in a phase-diagram spanned by the colloidal charge and the salt concentration. We compare our results to predictions based on the established description of colloidal suspensions in terms of pairwise additive Yukawa potentials, and find good agreement at high-salt, but not at low-salt concentration. Analyzing the effective pair-interaction between two colloids in a crystalline environment, we demonstrate that the difference in the melting behavior observed at low salt is due to many-body interactions

Basisqualifikation für die Alphabetisierungs- und Grundbildungsarbeit: die Fortbildung des Verbundprojekts "Pro Grundbildung" als Beitrag zur Professionalisierung

Vor dem Hintergrund der aktuellen Debatte um Qualifikationen und Kompetenzen der Lehrenden in der Erwachsenenbildung zielt die im Rahmen des Verbundprojekts ProGrundbildung entwickelte Fortbildung "Basisqualifizierung Alphabetisierung / Grundbildung" auf die Professionalisierung von Erwachsenenbildner/inne/n, die im Bereich Alphabetisierung und Grundbildung tätig sind bzw. tätig werden wollen, ab. Die Autorinnen stellen das Konzept der Fortbildung vor und diskutieren die im Rahmen der Evaluation der Qualifizierung erhobenen Daten zur Personalstruktur sowie zu Fortbildungsmotiven und Qualitätsmerkmalen von Fortbildungen. Schließlich wird aufgezeigt, welchen Beitrag die Fortbildung zur Professionalisierung der Alphabetisierung und Grundbildung darstellt

DELight: a Direct search Experiment for Light dark matter with superfluid helium

To reach ultra-low detection thresholds necessary to probe unprecedentedly low Dark Matter masses, target material alternatives and novel detector designs are essential. One such target material is superfluid $^4$He which has the potential to probe so far uncharted light Dark Matter parameter space at sub-GeV masses. The new ``Direct search Experiment for Light dark matter'', DELight, will be using superfluid helium as active target, instrumented with magnetic micro-calorimeters. It is being designed to reach sensitivity to masses well below 100\,MeV in Dark Matter-nucleus scattering interactions.Comment: IDM2022 proceedings submitted to SciPos

Conocimientos y habilidades mínimas, que un estudiante egresado de la carrera de Eduación Física, debiera poseer

Tesis (Profesor de Educación Física para la Enseñanza Básica, Licenciado en Educación)La siguiente investigación es llevada a cabo durante el segundo semestre del año 2017, para el seminario de grado de la carrera de Educación Física de la Universidad Andrés Bello. Se realiza un estudio respecto a los conocimientos o saber y a las habilidades o saber hacer mínimos que debe tener un egresado de la Carrera de Educación Física, esto considerando la opinión de una muestra de estudiantes de último año de dicha carrera. Para que la información sea lo más representativa posible se consultó a estudiantes de la Universidad Católica Silva Henríquez, Universidad Metropolitana de la Ciencias de la Educación (UMCE), Universidad SEK y la Universidad Andrés Bello (UNAB). Se asume que la aludida representatividad es parcial, sin embargo y tal como se explica en la viabilidad del estudio, los permisos y accesos a Instituciones de educación Superior es compleja. El instrumento utilizado fue una encuesta tipo cuestionario que permitió recabar los datos necesarios en breve tiempo. La confección de dicho instrumento estuvo a cargo de los propios tesistas y fue validado a través de tres expertos. El estudio se enmarca dentro las exigencias que se están instalando en la Formación Inicial Docente (FID), así como también, en los procesos de evaluación de los docentes y su formación continua. Todo ello en un marco regulatorio que propicia la Ley de Carrera Docente, (2016)

Spinal cord block with a destructive lesion of the dorsal spine in ankylosing spondylitis

No Abstract.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/37758/1/1780250217_ftp.pd

Melting of tantalum at high pressure determined by angle dispersive x-ray diffraction in a double-sided laser-heated diamond-anvil cell

The high pressure and high temperature phase diagram of Ta has been studied in a laser-heated diamond-anvil cell (DAC) using x-ray diffraction measurements up to 52 GPa and 3800 K. The melting was observed at nine different pressures, being the melting temperature in good agreement with previous laser-heated DAC experiments, but in contradiction with several theoretical calculations and previous piston-cylinder apparatus experiments. A small slope for the melting curve of Ta is estimated (dTm/dP = 24 K/GPa at 1 bar) and a possible explanation for this behaviour is given. Finally, a P-V-T equation of states is obtained, being the temperature dependence of the thermal expansion coefficient and the bulk modulus estimated.Comment: 31 pages, 8 figures, to appear in J.Phys.:Cond.Matte

Emerging evidence for platelets as immune and inflammatory effector cells

pre-printWhile traditionally recognized for their roles in hemostatic pathways, emerging evidence demonstrates that platelets have previously unrecognized, dynamic roles that span the immune continuum. These newly recognized platelet functions, including the secretion of immune mediators, interactions with endothelial cells, monocytes, and neutrophils, toll-like receptor (TLR) mediated responses, and induction of neutrophil extracellular trap formation, bridge thrombotic and inflammatory pathways and contribute to host defense mechanisms against invading pathogens. In this focused review, we highlight several of these emerging aspects of platelet biology and their implications in clinical infectious syndromes

Evidence for the h_b(1P) meson in the decay Upsilon(3S) --> pi0 h_b(1P)

Using a sample of 122 million Upsilon(3S) events recorded with the BaBar detector at the PEP-II asymmetric-energy e+e- collider at SLAC, we search for the $h_b(1P)$ spin-singlet partner of the P-wave chi_{bJ}(1P) states in the sequential decay Upsilon(3S) --> pi0 h_b(1P), h_b(1P) --> gamma eta_b(1S). We observe an excess of events above background in the distribution of the recoil mass against the pi0 at mass 9902 +/- 4(stat.) +/- 2(syst.) MeV/c^2. The width of the observed signal is consistent with experimental resolution, and its significance is 3.1sigma, including systematic uncertainties. We obtain the value (4.3 +/- 1.1(stat.) +/- 0.9(syst.)) x 10^{-4} for the product branching fraction BF(Upsilon(3S)-->pi0 h_b) x BF(h_b-->gamma eta_b).Comment: 8 pages, 4 postscript figures, submitted to Phys. Rev. D (Rapid Communications