Search results for "M3"

The Time Calibration System of KM3NeT: The Laser Beacon and the Nanobeacon

2015

The KM3NeT collaboration has started the construction of a deep sea neutrino telescope in the Mediterranean with an instrumented volume of several cubic kilometers. The objective of the KM3NeT telescope is to observe cosmic neutrinos. For this, the detector will consist of a tri-dimensional array of optical modules, each one composed of a pressure resistant glass sphere housing 31 small area photomultipliers. An important element of the KM3NeT detector is the system for the relative time calibration between optical modules with a precision of about 1 ns. The system comprises two independent devices: a nanobeacon inside each optical module for calibration of optical modules in the same verti…

PINGU: a vision for neutrino and particle physics at the South Pole

2017

The Precision IceCube Next Generation Upgrade (PINGU) is a proposed low-energy in-fill extension to the IceCube Neutrino Observatory. With detection technology modeled closely on the successful IceCube example, PINGU will provide a 6Mton effective mass for neutrino detection with an energy threshold of a few GeV. With an unprecedented sample of over 60,000 atmospheric neutrinos per year in this energy range, PINGU will make highly competitive measurements of neutrino oscillation parameters in an energy range over an order of magnitude higher than long-baseline neutrino beam experiments. PINGU will measure the mixing parameters $\theta_{\rm 23}$ and $\Delta m^2_{\rm 32}$, including the octan…

High-Resolution and Low Resource Time To Digital Converters for the KM3NeT Neutrino Telescope

2015

Nanobeacon and laser beacon: KM3NeT time calibration devices

2015

Deep sea tests of a prototype of the KM3NeT digital optical module: KM3NeT Collaboration

2014

The first prototype of a photo-detection unit of the future KM3NeT neutrino telescope has been deployed in the deep waters of the Mediterranean Sea. This digital optical module has a novel design with a very large photocathode area segmented by the use of 31 three inch photomultiplier tubes. It has been integrated in the ANTARES detector for in-situ testing and validation. This paper reports on the first months of data taking and rate measurements. The analysis results highlight the capabilities of the new module design in terms of background suppression and signal recognition. The directionality of the optical module enables the recognition of multiple Cherenkov photons from the same $^{40…

Vanishing Abelian integrals on zero-dimensional cycles

2011

In this paper we study conditions for the vanishing of Abelian integrals on families of zero-dimensional cycles. That is, for any rational function $f(z)$, characterize all rational functions $g(z)$ and zero-sum integers $\{n_i\}$ such that the function $t\mapsto\sum n_ig(z_i(t))$ vanishes identically. Here $z_i(t)$ are continuously depending roots of $f(z)-t$. We introduce a notion of (un)balanced cycles. Our main result is an inductive solution of the problem of vanishing of Abelian integrals when $f,g$ are polynomials on a family of zero-dimensional cycles under the assumption that the family of cycles we consider is unbalanced as well as all the cycles encountered in the inductive proce…

Un enfoque de marketing de relaciones a la educación como un servicio: aplicación a la Universidad de Valencia

2014

Esta investigación se plantea como una aproximación exploratoria a la vez que innovadora, en la medida en que su objetivo básico es el de aplicar el paradigma del marketing de relaciones al análisis de la gestión educativa. Más concretamente, lo que se persigue es construir un modelo integrado de relaciones entre el egresado y la universidad. Se realizaron 500 encuestas a egresados de una universidad española y se utilizaron modelos de ecuaciones estructurales para contrastar las relaciones planteadas. La aportación fundamental del trabajo radica en la conceptuación y medición de variables relativas al comportamiento y percepción de los egresados. Los resultados más relevantes confirman tre…

The Non-neuronal cholinergic system: an emerging drug target in the airways.

2001

The non-neuronal cholinergic system is widely expressed in human airways. Choline acetyltransferase (ChAT) and/or acetylcholine are demonstrated in more or less all epithelial surface cells (goblet cells, ciliated cells, basal cells), submucosal glands and airway smooth muscle fibres. Acetylcholine is also demonstrated in the effector cells of the immune system (lymphocytes, macrophages, mast cells). Epithelial, endothelial and immune cells express nicotinic and muscarinic receptors. Thus the cytomolecule acetylcholine can contribute to the regulation of basic cell functions via auto-/paracrine mechanisms (proliferation, differentiation, ciliary activity, secretion of water, ions and mucus,…

Unfolding the double shuffle structure of q-multiple zeta values

2015

We exhibit the double q-shuffle structure for the qMZVs recently introduced by Y. Ohno, J. Okuda and W. Zudilin.

Como as práticas ecológicas e o desperdício de alimentos influenciam o capital de marca do restaurante?

2020

Resumen El presente trabajo tuvo por objetivo evaluar la incidencia de las prácticas verdes, la innovación sostenible y el manejo del desperdicio alimentario en la construcción del capital de marca de los restaurantes. A partir de una investigación cuantitativa dirigida a responsables de restaurantes en Ecuador, se obtuvieron 120 cuestionarios válidos que permitieron estimar un modelo de ecuaciones estructurales a través de la regresión de mínimos cuadrados parciales. Los resultados obtenidos evidencian que las prácticas verdes orientadas a la formación del empleado y la innovación sostenible contribuyen significativamente a la reducción del desperdicio alimentario, que, a su vez, junto a l…