Critical points

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Phase transitions and critical points in the rare-earth region

Phase transitions and critical points in the rare-earth region

Recently, a renewed interest in the study of quantum phase transitions in atomic nuclei has emerged [1, 2, 3, 4]. A new class of symmetries that applies to systems localized at the critical points has been proposed. In particular, the “critical symmetry” E(5) [5] has been suggested to describe critical points in the phase transition from spherical to γ - unstable shapes while X(5) [6] is designed to describe systems lying at the critical point in the transition from spherical to axially deformed systems. These are based originally on particular solutions of the Bohr-Mottelson differential equations, but are usually applied in the context of the Interacting Boson Model (IBM) [7], since the latter provides a simple but detailed framework in which first and second order phase transitions can be studied. In the IBM language, the symmetry E(5) corresponds to the critical point between the U(5) and O(6) symmetry limits, while the X(5) symmetry should describe the phase transition region
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33 Lee mas

Behaviour of fixed and critical points of the  (α, c) −family of iterative methods

Behaviour of fixed and critical points of the (α, c) −family of iterative methods

In this section, we analyze the dynamical behavior of some particular methods lying on the line c = 1−α 2 , along the intervals described in Section 2. The interest of these regions is that, for these elements of the (α, c)-family, there exist a lower number of free critical points. Therefore, a more stable behavior can be expected.

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ANÁLISIS DE PELIGROS  Y PUNTOS CRÍTICOS DE CONTROL EN UNA PLANTA DE HELADOS / ANALYSIS OF DANGERS AND CRITICAL POINTS OF CONTROL IN A ICE CREAM PLANT

ANÁLISIS DE PELIGROS Y PUNTOS CRÍTICOS DE CONTROL EN UNA PLANTA DE HELADOS / ANALYSIS OF DANGERS AND CRITICAL POINTS OF CONTROL IN A ICE CREAM PLANT

22000:2005. It is very important for the company SERVISA Shipyard to offer a product of good hygienic quality, it was decided to make this investigation in the small Plants Icy Lark factory of the Managerial Unit of base of Alimentary Productions, because in the production of the ice cream didn't exist any procedure that measured and guaranteed the innocuousness of this product. The main objective of this paper is to design a procedure for the application of the system of analysis of danger and critical points of control in the small Icy Lark factory that guarantees the innocuousness of the product. This work allowed to evaluate the sanitary state of the areas of foods related with the production of the ice cream.
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9 Lee mas

One-dimensional mesh generation for critical points in an interval

One-dimensional mesh generation for critical points in an interval

In Numerical Methods, such as interpolation, numerical integration or numerical solving of dif- ferential equations, we have to discretize the domain wherein we are looking for an approximate numerical solution of a given problem. As initial approximation to this discretization, usually uni- form meshes are used. However, if some information is known in advance about the function being discretized, such an abrupt change or a violent oscillation in the neighborhood of a point, say a critical point, we can improve the numerical approximation by using non-uniform meshes which concentrate the number of mesh points nearby this critical point.
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12 Lee mas

Vol. 88, Núm. 03 (2017)

Vol. 88, Núm. 03 (2017)

The limitations of this study include the use of patches only at critical points and not the entire face, the use of only 3 types of protective patches and one type of mask. The limitations inherent to the use of a simulated model are also added: absence of skin and / or mechanical properties similar to this, absence of movement in the simulation manikin, which makes mask fixation and seal difficult, as well as variability in respiratory volumes and flows. Two variables not con- sidered in this study and of vital importance in future investigations are the exposure time between protecti- ve patches-mask and the temperature inside the mask. Both two variables could influence the physical-mole- cular properties of force distribution and congruence of a patch. Despite the limitations described, we be- lieve it is relevant to question the empirical use of the commonly used protective patches in the prevention of facial PU secondary to the adjustment of the NIMV mask.
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6 Lee mas

Dynamical Analysis to Explain the NumericalAnomalies in the Family of Ermakov KalitkinType Methods

Dynamical Analysis to Explain the NumericalAnomalies in the Family of Ermakov KalitkinType Methods

As we have previously stated, the dynamical behavior of operator G(z, α) de- pends on the value of parameter α and it is deduced by following the orbit of a free critical point. In this family there are four critical points, but only two of them are independent as they are two-by-two conjugated. The fact that they are conjugated implies that if one critical orbit converges to z = 0 then the other one converges to z = ∞; therefore, it is enough to analyze the asymptotic behavior of one of the conjugated critical orbits, i.e. the orbits of the free inde- pendent critical points, in order to study the existence of any attractor other than the roots, z = 0 and z = ∞. In fact, we only have two different parameter planes, as can be seen in Figure 5.
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Bologna Process within the Italian University

Bologna Process within the Italian University

One of the critical points is the fact that the reform of 1999 «compacted» the previous 4-year system – characterising the most of the Italian degree courses – into the first cycle of the university path (Laurea triennale), through the introduction of the three-cycle university structure (3 + 2 + Doctorate; Specialisation Course; second level Master); that increased the didactic workload for the students, and the number of the exams shattering at a di- dactic level the curricula and the teaching units into little fractions of for- mation 1

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Estudio comparativo de preparación de fármacos peligrosos con varias modalidades de sistemas cerrados mediante simulación con fluoresceína

Estudio comparativo de preparación de fármacos peligrosos con varias modalidades de sistemas cerrados mediante simulación con fluoresceína

Contamination in critical points was also studied. From a qualitative point of view, it was considered con- tamination if any of the 3 critical points were visually present. A quantitative analysis was done by placing the points on cellulose paper and measuring the largest dia- meter of them. To detect safety after the disconnection, the valve of the extension tube was disconnected and a qualitative measurement of fluorescein on cellulose pa- per was then performed.

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Using texting to support students’ transition to university Dave Harley , Sandra Winn, Sarah Pemberton and Paula Wilcox

Using texting to support students’ transition to university Dave Harley , Sandra Winn, Sarah Pemberton and Paula Wilcox

We have demonstrated that an application such as Student Messenger can enhance the support provided to students by an academic department during the transition to university. Text messages from staff, inserted into the existing text message dialogue amongst students at critical points during the first year, can inform the dialogue already taking place and aid students’ social integration into university life. We suggest that, if universities wish to provide forms of social support which will encourage engagement with their institutions, then an awareness of the social importance of texting and an engagement with this medium is essential. It would be a missed opportunity if universities were to continue to neglect texting as a potential means of supporting first-year students when these very same students are already conducting a substan- tial part of their lives via this medium.
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On the MOID computation: a new effective method

On the MOID computation: a new effective method

There is an abundant literature on MOID computation from the mid-20th century to the present day. Some authors use an algebraic approach, obtaining all critical points of the distance function. Others use numerical methods, finding the global minimum by iterations. Others use a hybrid approach, such as Derevyanka (2014). Some key results are summarized in Table 1.

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Ruelle operator and transcendental entire maps

Ruelle operator and transcendental entire maps

If f is a transcendental entire function with only algebraic singularities we calculate the Ruelle operator of f . Moreover, we prove both (i) if f has a summable critical point, then f is not structurally stable under certain topological conditions and (ii) if all critical points of f belonging to Julia set are summable, then there exists no invariant lines fields in the Julia set.

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The Role of Critical Thinking in Effective Decision Making

The Role of Critical Thinking in Effective Decision Making

What are the symptoms of being a critical thinker? The indicator that someone is practicing critical thinking (to some degree) is that they continually question their own and other people’s assumptions, reasons, motivations, and outlook. This questioning must not focus on generat- ing mere contradiction but rather on the discovery of context, reasoning, and point of view. Critical thinkers ask questions to answer questions and seek reason and logic as the founda- tion for understanding.

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The Minimum Number of Points Taking Part in k-Sets in Sets of Unaligned Points

The Minimum Number of Points Taking Part in k-Sets in Sets of Unaligned Points

(Subsection 2.1). Furthermore, the authors prove that a similar example to the presented in Subsection 2.1 cannot be found for the minimum number of k-sets (Section 3). So the authors conclude that the only arrangement of points with the minimum number of k-sets ( 2 k  1 ) is that described by Erdõs et al. [1] and

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SISTEMA DE ASEGURAMIENTO DE LA CALIDAD MEDIANTE LA APLICACIÓN DEL SISTEMA HACCP EN LA INDUSTRIA DE PASTAS ALIMENTICIAS

SISTEMA DE ASEGURAMIENTO DE LA CALIDAD MEDIANTE LA APLICACIÓN DEL SISTEMA HACCP EN LA INDUSTRIA DE PASTAS ALIMENTICIAS

En este trabajo se presenta un estudio del HACCP (Hazard Analysis Critical Control Points) como un sistema de aseguramiento de la calidad en lo referente a la inocuidad para la industria de alimentos, mencionando las técnicas generalmente usadas para llevar a acabo este estudio y mostrando un ejemplo mediante su aplicación en la industria de pastas alimenticias. Como resultado se elaboró la tabla de control HACCP, la misma que recopila los PCC, el peligro posible, los límites críticos, las medidas correctivas, sistema de monitoreo y responsables de las acciones tomadas. In this work is presented the Hazard Analysis Critical Control Points - HACCP as a quality assurance regarding to the food industry safety, mentioning the techniques generally used to achieve the HACCP study and showing an example through it's application in the noodle industry. As main results was elaborated the control chart HACCP it gathers the PCC, the possible hazard, the critical limits, corrective action, monitoring system and the responsible for the taken actions. Palabras clave / Key words
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El sistema internacional -HACCP- en el actual derecho interno argentino . A propósito del acuerdo de medidas sanitarias y fitosanitarias de la OMC y las barreras no arancelarias al comercio internacional

El sistema internacional -HACCP- en el actual derecho interno argentino . A propósito del acuerdo de medidas sanitarias y fitosanitarias de la OMC y las barreras no arancelarias al comercio internacional

Abstract: El programa de Análisis de Peligros y Puntos Críticos de Control conocido por su siglas HACCP, Hazar Análisis Critical Control Points,es un método de fiscalizacalización de productos caracterizado por presentar enfoques preventivos y sistemáticos, para eliminar o minimizar los peligros físicos, químicos y biológicos en los alimentos, constituyendo, en la

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A Consumer Resource Description of Public Goods Production in Microbes

A Consumer Resource Description of Public Goods Production in Microbes

Experimentally, we propose ideas to prove some of the results. One could measure the thresholds of the population density and density of AIs varying the initial values of the resource and bacteria in order to see whether it fits with our theoretical expressions. Furthermore, it is known that the level of resources affects the activation of PGs produc- tion, as in Pseudomonas aeruginosa [26]. It would be interesting to check if the critical value of the resources is a real threshold for the activation. A possible experiment is to use a chemostat (see chapter 4 of [15] for the details of the dynamical system). Using this approach and for a maximum possible concentration of resources of the medium suf- ficiently large, the critical value of the resources R cr becomes a stable stationary value
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41 Lee mas

Sensory Shelf Life of Dulce de Leche.pdf

Sensory Shelf Life of Dulce de Leche.pdf

Consumer panel. Consumers were from the town of Nueve de Julio, Argentina. They consumed DL at least once a week, and their ages were between 18 and 50 yr. For each critical descriptor, 50 consumers were recruited. For plastic flavor, burnt flavor, and dark color, each consumer received the 9 samples corres- ponding to the 9 concentration levels of the descriptor (see Table 2) and evaluated these using the scales shown in Figure 3. For spreadability, consumers re- ceived 7 samples and were asked to spread DL over a cracker with a knife and evaluate it using the scale shown in Figure 3. The samples were presented monad- ically in random order. For plastic and burnt flavors, water and cracker-type biscuits were available. Follow- ing the test, the consumers received a bag with candy and chocolates as a reward for their participation.
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7 Lee mas

Constrained equations with impasse points

Constrained equations with impasse points

In general, phase-equivalence does not imply path-equivalence, but in the case of regular impasse points these two properties are almost the same, except that one has to consider the directions in which the solutions of the equations run through its phase curves. More precisely we have the next theorem

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Characterization of a biomethane like synthetic gas mixture through accurate density measurements from (240 to 350) K and pressures up to 14 MPa

Characterization of a biomethane like synthetic gas mixture through accurate density measurements from (240 to 350) K and pressures up to 14 MPa

In this work the thermodynamic behavior of a synthetic four-component biomethane-like mixture, composed mainly of methane (96.48%), with small amounts of carbon dioxide (2.00%), nitrogen (1.50%), and traces of oxygen (0.02%), is studied using accurate (p,ρ,T) experimental data. Two mixtures of identical nominal compositions were prepared by the gravimetric method at the Spanish National Metrology Institute (Centro Español de Metrología, CEM) and at the Slovak National Metrology Institute (Slovenský Metrologický Ústav, SMÚ). The composition was double checked by Gas Chromatography, at both NMI and at the beginning and end of the measurements. An additional test of the consistency of the given compositions was performed by measuring the density of both mixtures at selected points, with two different techniques, in two different laboratories. Accurate density measurements have been taken over a wide temperature range, from (240 to 350) K, and pressures up to 14 MPa, using a single-sinker densimeter with magnetic suspension coupling. Experimental data are compared with the densities calculated with the GERG-2008 and AGA8-DC92 equations of state. Deviations between experimental and GERG-2008-estimated densities are within a ±0.03% band at all temperatures, which shows the outstanding performance of the current reference equation for natural gases when describing a biomethane-like mixture. Deviations between experimental and AGA-8-estimated densities are higher than 0.04% at 250 K for pressures greater than 10 MPa and also at 240 K for pressures higher than 9 MPa. This work is part of the research project ‘Metrology for Biogas’ supported by the European Metrology Research Program.
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38 Lee mas

Effort points  Programa Gamificado para la Universitat de les Illes Balears

Effort points Programa Gamificado para la Universitat de les Illes Balears

Tres necesidades que cuando están cubiertas sugieren que una actividad valdrá la pena para la gente por sí misma. Y esto se ha probado estudio tras estudio, ámbito tras ámbito, incluido en el de los videojuegos. La interacción social es un elemento presente en muchos videojuegos. Un elemento importante dentro de la gamificación. Kevin Werbach expone varios ejemplos de gamificación basados en Fitocracy. Fitocracy es una plataforma que anima a las personas a hacer ejercicio, entrenarse y ponerse en forma, para ello utiliza todo tipo de los estándares de elementos de juego PBL (Points, Badges and Leaderboard) de una forma coherente y sofisticada, ya que están realmente enfocados a motivar de forma intrínseca a las personas para atraerlas a la actividad. Los ejemplos del profesor Werbach ponen en relieve la importancia de las tres necesidades explicadas y como se van cubriendo gracias a los elementos que utiliza esta plataforma. Es importante destacar que los elementos utilizados no están previamente definidos como motivadores extrínsecos o intrínsecos, sino que dependen del contexto y de la forma en que se apliquen.
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55 Lee mas

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