Modelling of Stator Coil–To–Ground Faults in Induction Motor

Three–phase squirrel cage induction motors are the most widespread types of electrical motors which can be found in both industrial and tertiary applications. There are some reasons why they are so often used, such as simple construction, nearly maintenance-free, advantageous price and the possibility to feed them directly from the AC network. Even if their reliability is very high, some unexpected breakdowns can occur during their operation. In this paper, coil–to–ground faults of motor stator winding have been taken into consideration. These failures have been modelled in several points of one stator phase using COMSOL software. As seen from simulation results these failures have a significant impact on current distribution in stator phases causing changes in rotor currents, motor inner torque, speed, etc., depending strongly on the actual point of the failure.

MODEL FOR EVALUATING THE EFFECTIVENESS OF EXTERNAL MUNICIPAL FINANCIAL CONTROL BODIES

External municipal financial control bodies based on the existing models of the evaluating the effec-tiveness of their activities. The authors of this article have developed the model of the effectiveness of the external municipal financial control bodies, composed of complex criteria for control and expert-analytical activities, including the system of indicators for comprehensive assessment of performance, efficiency, intensity and dynamism of the activities of external municipal financial control bodies. The features of the activities of the external municipal financial control bodies of the different subjects of the Russian Federation, their powers, scale and differences in the level of economic development, quantitative results of the activities, the quality of external municipal financial cont-rol, as well as scientific approaches of Russian and foreign authors were taken into account. In order to exclude the impact on the comprehensive assessment of the effectiveness of the external municipal financial control bodies of the dimension of indicators, the method was chosen for normalizing the values of indicators relative to the highest and lowest values, with the conversion of the values of indicators to the point scale in the range from 1 to 10. The convo-lution of point values of indicators into the complex criterion is carried out on the basis of normalization of the sum of actual point values relative to the sum of the maximum possible point value of the indicator. On the basis of complex criteria, generalized criterion for the effectiveness of the external municipal financial control bodies is determined; it is calculated as the geometric weighted average of complex criteria. For the purpose of analyzing the effectiveness of the external municipal financial control bodies, the discriminant function divides them into more or less effective ones.

G.E. Moore and the Problem of the Criterion

In this paper, I offer an understanding of G.E. Moore’s epistemology as presented in, “A Defence of Common Sense” and “Proof of an External World.” To frame the discussion, I look to Roderick Chisholm’s essay, The Problem of the Criterion. I begin by looking at two ways that Chisholm believes one can respond to the problem of the criterion, and, referring back to Moore’s essays, explain why it is not unreasonable for Chisholm to believe that he is following a line of reasoning that Moore might take. I then show why I believe Chisholm is actually trying to do something quite different from what Moore was, and thus misses Moore’s actual point. I conclude that Moore is best understood as rejecting traditional epistemological concerns. By forcing Moore to deal with a traditional epistemological problem, it will become clear how bold Moore’s “epistemology” is.

Cellulose-Based Carbon Molecular Sieve Membranes for Gas Separation: A Review

In the field of gas separation and purification, membrane technologies compete with conventional purification processes on the basis of technical, economic and environmental factors. In this context, there is a growing interest in the development of carbon molecular sieve membranes (CMSM) due to their higher permeability and selectivity and higher stability in corrosive and high temperature environments. However, the industrial use of CMSM has been thus far hindered mostly by their relative instability in the presence of water vapor, present in a large number of process streams, as well as by the high cost of polymeric precursors such as polyimide. In this context, cellulosic precursors appear as very promising alternatives, especially targeting the production of CMSM for the separation of O2/N2 and CO2/CH4. For these two gas separations, cellulose-based CMSM have demonstrated performances well above the Robeson upper bound and above the performance of CMSM based on other polymeric precursors. Furthermore, cellulose is an inexpensive bio-renewable feed-stock highly abundant on Earth. This article reviews the major fabrication aspects of cellulose-based CMSM. Additionally, this article suggests a new tool to characterize the membrane performance, the Robeson Index. The Robeson Index, θ, is the ratio between the actual selectivity at the Robeson plot and the corresponding selectivity—for the same permeability—of the Robeson upper bound; the Robeson Index measures how far the actual point is from the upper bound.

Consumer segmentation in the German meat market: purchasing habits

Only considering consumers’ store format choice seldom provides sufficient information on their choice of the actual point of purchase for meat: self-service counter or service counter. For retailers, however, it is of crucial importance to know how meat shoppers differ in their store format choice, preferred type of meat packaging and how these differences can be explained. This paper investigates how attitudes and sociodemographics influence consumer segmentation regarding store format choice and preferred meat packaging type in the German meat market. 667 consumers were segmented based on their purchasing frequency, store format choice, and preferred type of meat packaging using cluster analysis. Then, an exploratory factor analysis examined attitudinal factors. Finally, the factors and respondents’ sociodemographics were regressed onto the consumer clusters using multinomial logistic regression. The application of appropriately adapted marketing strategies can help increase patronage in the segments.

Un altro ordine del tempo

During the last decade there has been a radical rethink, in the European context of both theatre and performing arts, on how a performance or a spectacle is narrated and enjoyed. Artists like Milo Rau, Tino Sehgal, Marten Spangberg, Rabih Mrouè, Amir Reza Koohestani, and Richard Maxwell structure their practices on a reflection about the concept of time and on how it can be returned on stage. A different order of time is the second chapter of a three-parts essay focused on the analysis of the artists' works; the essay aims to create a dialogue between the artistic works and the actual point of the debate about time through a philosophical, scientific and social perspective. How does performing arts design the relationship between time and our evolution as individuals today? In which manner the collective tale configures itself through this artistic, utopian narrative? And what about the analysis tools we might need to effectively enjoy these works?

Extraction of Rotational Surfaces and Generalized Cylinders from Point-Clouds Using Section Curves

In industrial facilities, there are various types of equipment composed of surfaces that have a high degree of freedom. Rotational surfaces and generalized cylinders are often used for equipment handling liquids and gases. In this paper, we propose methods for reconstructing rotational surfaces and generalized cylinders from noisy and incomplete point-clouds captured by a terrestrial laser scanner. In our method, we convert point-clouds into wireframe models and calculate the intersection points with section planes. Then, we extract ellipses from the intersection points on each section plane and reconstruct the rotational surfaces and generalized cylinders using the extracted ellipses. We also propose a method for subdividing a rotational surface into primitive surfaces. We evaluated our method using actual point-clouds of engineering facilities and confirmed that our method could successfully reconstruct rotational surfaces and generalized cylinders.

Un altro ordine del tempo

During the last decade, there has been a radical rethink, in the European context of both theatre and performing arts, on how a performance or a spectacle is narrated and enjoyed. Artists like Milo Rau, Tino Sehgal, Marten Spangberg, Rabih Mrouè, Amir Reza Koohestani, and Richard Maxwell structure their practices on a reflection about the concept of time and on how it can be returned on stage. "A different order of time" is a three-parts essay focused on the analysis of the artists' works; the essay aims to create a dialogue between the artistic works and the actual point of the debate about time through a philosophical, scientific and social perspective. How does performing arts design the relationship between time and our evolution as individuals today? In which manner the collective tale configures itself through this artistic, utopian narrative? And what about the analysis tools we might need to effectively enjoy these works?

An Improved Version of K-medoid Algorithm using CRO

Clustering is the process of grouping a set of patterns into different disjoint clusters where each cluster contains the alike patterns. Many algorithms had been proposed before for clustering. K-medoid is a variant of k-mean that use an actual point in the cluster to represent it instead of the mean in the k-mean algorithm to get the outliers and reduce noise in the cluster. In order to enhance performance of k-medoid algorithm and get more accurate clusters, a hybrid algorithm is proposed which use CRO algorithm along with k-medoid. In this method, CRO is used to expand searching for the optimal medoid and enhance clustering by getting more precise results. The performance of the new algorithm is evaluated by comparing its results with five clustering algorithms, k-mean, k-medoid, DB/rand/1/bin, CRO based clustering algorithm and hybrid CRO-k-mean by using four real world datasets: Lung cancer, Iris, Breast cancer Wisconsin and Haberman’s survival from UCI machine learning data repository. The results were conducted and compared base on different metrics and show that proposed algorithm enhanced clustering technique by giving more accurate results.

El fin del capitalismo: la interpretación de Wolfgang Streeck del postcapitalismo

With the blast of the financial crisis in 2007, the theme of the end of the capitalism became once again fashionable. This article aims to expose the ideas about it of one of the most recognised german sociologists nowadays, Wolfgang Streeck. First, we will introduce his understandings about “capitalism.” Then, how he interprets the end of the capitalism itself. From there we will be able to appreciate the subtle nuances of the narrative he proposes to explain how we arrived at the actual point where we are now. The last section presents the ideological base that, in Streeck’s opinion, holds the current socioeconomic situation. Key words:Streeck; postcapitalism; postsociety; citizenry; investors.