Stable fermion mass matrices and the charged lepton contribution to neutrino mixing

We study the general properties of hierarchical fermion mass matrices in which the small eigenvalues are stable with respect to perturbations of the matrix entries and we consider specific applications to the charged lepton contribution to neutrino mixing. In particular, we show that the latter can account for the whole lepton mixing. In this case a value of sin \u3b813 73 me/m\u3bcsin \u3b823 48 0.03, as observed, can be obtained without the need of any fine-tuning, and present data allow to determine the last row of the charged lepton mass matrix with good accuracy. We also consider the case in which the neutrino sector only provides a maximal 12 rotation and show that i) present data provide a 2\u3c3 evidence for a non-vanishing 31 entry of the charged lepton mass matrix and ii) a plausible texture for the latter can account at the same time for the atmospheric mixing angle, the \u3b813angle, and the deviation of the \u3b812angle from \u3c0/2 without fine-tuning or tension with data. Finally, we show that the so-called \u201cinverted order\u201d of the 12 and 23 rotations in the charged lepton sector can be obtained without fine-tuning, up to corrections of order me/m\u3bc. \ua9 2014, The Author(s)

Predictions for the Leptonic Dirac CP Violation Phase: a Systematic Phenomenological Analysis

We derive predictions for the Dirac phase $\delta$ present in the $3\times 3$ unitary neutrino mixing matrix $U = U_e^{\dagger} \, U_{\nu}$, where $U_e$ and $U_{\nu}$ are $3\times 3$ unitary matrices which arise from the diagonalisation respectively of the charged lepton and the neutrino mass matrices. We consider forms of $U_e$ and $U_{\nu}$ allowing us to express $\delta$ as a function of three neutrino mixing angles, present in $U$, and the angles contained in $U_{\nu}$. We consider several forms of $U_{\nu}$ determined by, or associated with, symmetries, tri-bimaximal, bimaximal, etc., for which the angles in $U_{\nu}$ are fixed. For each of these forms and forms of $U_e$ allowing to reproduce the measured values of the neutrino mixing angles, we construct the likelihood function for $\cos \delta$, using i) the latest results of the global fit analysis of neutrino oscillation data, and ii) the prospective sensitivities on the neutrino mixing angles. Our results, in particular, confirm the conclusion reached in earlier similar studies that the measurement of the Dirac phase in the neutrino mixing matrix, together with an improvement of the precision on the mixing angles, can provide unique information about the possible existence of symmetry in the lepton sector

Generalised geometrical CP violation in a T' lepton flavour model

We analyse the interplay of generalised CP transformations and the non-Abelian discrete group T \u2032 and use the semi-direct product G f = T \u2032 caH CP, as family symmetry acting in the lepton sector. The family symmetry is shown to be spontaneously broken in a geometrical manner. In the resulting flavour model, naturally small Majorana neutrino masses for the light active neutrinos are obtained through the type I see-saw mechanism. The known masses of the charged leptons, lepton mixing angles and the two neutrino mass squared differences are reproduced by the model with a good accuracy. The model allows for two neutrino mass spectra with normal ordering (NO) and one with inverted ordering (IO). For each of the three spectra the absolute scale of neutrino masses is predicted with relatively small uncertainty. The value of the Dirac CP violation (CPV) phase \u3b4 in the lepton mixing matrix is predicted to be \u3b4 = \u3c0/2 or 3\u3c0/2. Thus, the CP violating effects in neutrino oscillations are predicted to be maximal (given the values of the neutrino mixing angles) and experimentally observable. We present also predictions for the sum of the neutrino masses, for the Majorana CPV phases and for the effective Majorana mass in neutrinoless double beta decay. The predictions of the model can be tested in a variety of ongoing and future planned neutrino experiments

A General Framework for Large Scale Systems Development

This paper describes a general framework for the modeling, design, simulation, and prototyping of large scale systems. The framework uses a coherent set of tools that model the system at hand, take a control design and analyze, verify, and simulate it; and then can generate code that can be run in a target real-time software platform in the physical system. The paper emphasizes the specification language SHIFT and the simulation tools used by the framework. We present the development of the Automated Highway System as an example. 1 Introduction Large engineering systems, such as automated highway systems (AHS), autonomous vehicle systems (AVS), material handling systems, air traffic management systems (ATMS) face the challenge of providing reliable services using scarce resources. Clients of such systems demand performance, safety, comfort, and efficiency. The problem is often compounded by physical resources that are saturated, inefficiently utilized, or technologically outdated. In ..

The effect of radiologist's experience on the measurement of appendix diameter in children with acute appendicitis [Akut apandisitli çocuklarda apendiks çapinin ölçülmesinde radyoloji uzmaninin deneyiminin etkisi]

Objective: The aim of this study was to determine the importance of radiologist's experience in the diagnosis of appendicitis via comparing the diameter of appendix measured by ultrasonography (US) with manual measurement during surgery. Material and Methods: Sociodemographic data, and preoperative US results of, 50 patients who underwent appendectomy, duration of experience of radiologists, and manually measured diameters of appendices, were retrospectively reviewed. Radiologists who performed US were divided into three groups according to their experience. The diameter of appendices measured by US and manual measurement during surgery were compared as for their concordance in consideration of the experience of radiologists. Results: Thirty-two (64%) patients were male, and 18 (36%) were female. The median age of the patients was 10 (5-18) years. It was observed that diameters of appendices measured by radiologists who had greater professional experience were higher compabilty with diameters of appendces measured during surgery. Conclusion: USG is the first preferred imaging modality in the diagnosis of acute appendicitis. There are studies suggesting further radiology examinations such as computed tomography in the diagnosis of acute appendicitis when ultrasonography can not yield clear-cut information. Repetition of the US examination by a more experienced radiologist is less invasive and may be useful in making the diagnosis. © 2019 Logos Medical Publishing. All Rights Reserved

Device stability of inverted and conventional bulk heterojunction solar cells with MoO3 and ZnO nanoparticles as charge transport layers

The performance and stability of both inverted and conventional organic photovoltaic devices were examined with low temperature chemically synthesized ZnO nanoparticles as electron transporting layer and MoO3 as hole transporting layer. The device efficiency and energy conversion efficiency in inverted devices were found to be 3.48% and 68%, respectively, whereas, in conventional devices these were 2.86% and 55%, respectively. This change of efficiency in inverted and conventional devices relates with the change of flat-band voltage extracted from Mott-Schottky capacitance study. The inverted device shows excellent efficiency even after 250 h in unencapsulated condition. However, the conventional device efficiency degrades very quickly compared with the inverted one. Thus, the films deposition order plays a pivotal role for fabricating a stable and high performance organic photovoltaic device. (C) 2013 Elsevier B.V. All rights reserved

Endoscopic balloon dilatation of benign esophageal strictures in childhood: a 15-year experience

Bahadir, Gulnur Gollu/0000-0001-8163-2226; Aktug, Tanju/0000-0003-0078-7838WOS: 000371535800010PubMed: 25515612The study aims to evaluate the effectiveness and safety of endoscopic balloon dilatation (EBD) in childhood benign esophageal strictures. The medical records of 38 patients who underwent EBD from 1999 to 2013 were retrospectively reviewed. Demographic features, diagnoses, features of strictures, frequency and number of EBD, complications, outcome, and recurrence data were recorded. Median age was 1.5 years (0-14), and female/male ratio was 17/21 (n = 38). Primary diagnoses were corrosive esophageal stricture (n = 19) and esophageal atresia (n = 19). The length of strictures were less than 5cm in 78.9% (n = 30). No complication was seen in 86.8% (n = 33). Perforation was seen in 10.5% (n = 4), and recurrent fistula was seen in 2.7% (n = 1). Total treatment lasted for 1 year (1-11). Dysphagia was relieved in 60.5% (n = 23). Recurrence was seen in 31.6% (n = 12). Treatment effectiveness was higher, and complication rates were lower in strictures shorter than 5cm compared with longer ones (70% vs. 25%, P 0.05). EBD is a safe and efficient treatment choice in esophageal strictures, especially in strictures shorter than 5cm and anastomotic strictures