Search results for "Gram"

Improved Quadratic Time-frequency Distributions for Detecting Inter-turn Short Circuits of PMSMs in Transient States

2020

This paper aims to improve quadratic time-frequency distributions to adapt condition monitoring of electrical machines in transient states. Short-Time Fourier transform (STFT) has been a baseline signal processing technique for detecting fault characteristic frequencies. However, limits of window sizes due to loss of frequency- or time-resolution, make it hard to capture rapid changes in frequencies. Within this study, Choi-Williams and Wigner-Ville distributions are proposed to effectively detect peaks at characteristic frequencies while still maintaining low computation time. The improved quadratic time-frequency distributions allow for generating spectrograms of a longer lasting data sig…

Errors Generated by Uncertain Data

2014

In this chapter, we study effects caused by incompletely known data. In practice, the data are never known exactly, therefore the results generated by a mathematical model also have a limited accuracy. Then, the whole subject of error analysis should be treated in a different manner, and accuracy of numerical solutions should be considered within a framework of a more complicated scheme, which includes such notions as maximal and minimal distances to the solution set and its radius.

Appendix: Feynman rules

2010

Hadronic light-by-light contribution to $(g-2)_\mu$ from lattice QCD with SU(3) flavor symmetry

2020

We perform a lattice QCD calculation of the hadronic light-by-light contribution to $(g-2)_\mu$ at the SU(3) flavor-symmetric point $m_\pi=m_K\simeq 420\,$MeV. The representation used is based on coordinate-space perturbation theory, with all QED elements of the relevant Feynman diagrams implemented in continuum, infinite Euclidean space. As a consequence, the effect of using finite lattices to evaluate the QCD four-point function of the electromagnetic current is exponentially suppressed. Thanks to the SU(3)-flavor symmetry, only two topologies of diagrams contribute, the fully connected and the leading disconnected. We show the equivalence in the continuum limit of two methods of computin…

A comparison of different synchronization measures in electroencephalogram during propofol anesthesia

2016

Electroencephalogram (EEG) synchronization is becoming an essential tool to describe neurophysiological mechanisms of communication between brain regions under general anesthesia. Different synchronization measures have their own properties to reflect the changes of EEG activities during different anesthetic states. However, the performance characteristics and the relations of different synchronization measures in evaluating synchronization changes during propofol-induced anesthesia are not fully elucidated. Two-channel EEG data from seven volunteers who had undergone a brief standardized propofol anesthesia were then adopted to calculate eight synchronization indexes. We computed the predi…

Lack of Good Governance or hazard of consumers e-Health? Evidence through a dynamic outcome based-performance in the Italian healthcare sector about …

This research aims to analyse the management of the health policies to contain the measles outbreaks in Italy. In particular, this study wants to find out what are the key factors that led to the measles outbreak of 2017 and its previous cyclical trend, analysing the impact of ehealth strategy in the management of the epidemics. Understanding the complexity of this issue will help to evaluate the actual policies of the Italian Ministry of Healthcare and to steer the policy-makers to frame sustainable policies to manage the risk of a measles outbreak. The thesis is structured in four chapters. The first chapter, through a literature review, discusses the evolution of the management of epidem…

The use of cryptograms with arithmetic operations in school teaching

2013

The text presents a method of solving cryptograms with arithmetic operations. This method is based on systems of equations. In the case of cryptograms with adding and subtracting operations we have to solve systems of linear equations while in the case of cryptograms with multiplying and dividing operations we have to solve systems of non-linear equations. The method of deciphering cryptograms will be illustrated by examples.

Gauge theory phase diagrams from holography

2014

Socializācijas sekmēšana 1.klašu skolēniem ar smagiem garīgiem attīstības traucējumiem

2020

Diplomdarba temats: „Socializācijas sekmēšana 1. klašu skolēniem ar smagiem garīgiem attīstības traucējumiem” Pētījums veikts ar mērķi atklāt piemērotākās pieejas skolēnu ar garīgās attīstības traucējumiem socializācijas sekmēšanai speciālās izglītības iestādes pedagoģiskā procesa ietvaros. Lai sasniegtu minēto mērķi, darbā teorētiski pētīta skolēnu ar smagiem garīgās attīstības traucējumiem (GAT) attīstības raksturojums un pedagoģiskās iespējas, galveno uzmanību pievēršot skolēnu socializācijas dažādiem aspektiem, kuras sekmēšanas pedagoģiskais pamatuzdevums ir nodrošināt maksimāli iespējamo skolēnu patstāvību. Empīriskajā daļā raksturots pedagoģiskā darba īpatnības četros pamatvirzienos: …

Surrogate-assisted evolutionary multiobjective shape optimization of an air intake ventilation system

2017

We tackle three different challenges in solving a real-world industrial problem: formulating the optimization problem, connecting different simulation tools and dealing with computationally expensive objective functions. The problem to be optimized is an air intake ventilation system of a tractor and consists of three computationally expensive objective functions. We describe the modeling of the system and its numerical evaluation with a commercial software. To obtain solutions in few function evaluations, a recently proposed surrogate-assisted evolutionary algorithm K-RVEA is applied. The diameters of four different outlets of the ventilation system are considered as decision variables. Fr…