This paper presents a numerical investigation of the effects of lamination orientation on the fracture behaviour of rectangular steel wires for civil engineering applications using finite element (FE) analysis. The presence of mid-thickness across-the-width lamination changes the cup and cone fracture shape exhibited by the lamination-free wire to a V-shaped fracture with an opening at the bottom/pointed end of the V-shape at the mid-thickness across-the-width lamination location. The presence of mid-width across-the-thickness lamination changes the cup and cone fracture shape of the lamination-free wire without an opening to a cup and cone fracture shape with an opening at the lamination location. The FE fracture behaviour prediction approach adopted in this work provides an understanding of the effects of lamination orientation on the fracture behaviour of wires for civil engineering applications which cannot be understood through experimental investigations because it is impossible to machine laminations in different orientations into wire specimens.
The discourse on homosexually has largely remained Euro-American with a focus on human right of African homosexuals residing in Africa. However, current debates in Africa have centered on the cultural acceptability, legality as well as mental health concerns presumed to be associated with homosexuality. The paper approaches the issue of homosexuality from a perspective that is sensitive to the cultural context of Ghana and also through a non-Euro-American lens. The author attempts to address some of the misunderstanding about the legal status of homosexuals and the negative attitudes in Ghana. The paper concludes that Ghanaians face a paradox of accepting homosexuality because it cannot be understood to further growth of human society from their perspective. Similarly, if Ghanaians view homosexuality as a mental health issue, then it is more appropriate to decriminalize it as it is not appropriate to criminalize mental disorders. Reconceptualizing the issue as a human rights one in which both anti- and pro-homosexual religious and sexual rights respectively are accommodated may be more progressive than promoting one set of rights at the expense of the other. Though Ghana is the focus of this paper, it is believed that the discussions presented are applicable to the rest of Africa and other non-Western societies.
Twinned dendrites in Al-Zn alloy with high Zn content (40% wt.%) were successfully prepared by directional solidification. At different directional solidification rates (1000 and 1500 μm/s), microstructures and growth orientation variations of Al twinned dendrite and non-twinned dendrite were characterized. By using the inverted trapezoidal graphite sleeve at 1000 μm/s, Al twinned dendrite were formed to developed feather crystal structures in longitudinal section. Its primary and secondary twinned dendrite were grew along [110] direction. Moreover the deviation angle between [110] direction of Al twinned dendrite and the heat flow direction was about 27.15°. While not using the inverted trapezoidal graphite sleeve at 1000 and 1500 μm/s, Al dendrite was the non-twinned dendrite and the twinned dendrite was not appeared. The experimental results showed that the higher temperature gradient, a certain pulling rate and convection environment were the formation conditions of twinned dendrites.
This paper presents results of object-oriented classification of Landsat ETM+ satellite im-age conducted using eCognition software. The classified image was acquired on 7 May 2000. In this particular study, an area of 423 km2 within the borders of Legionowo Community near Warsaw is considered.
Prior to classification, segmentation of the Landsat ETM+ image is performed using panchro-matic channel, fused multispectral and panchromatic data. The applied methods of classification en-abled the identification of 18 land cover and land use classes. After the classification, generalization and raster to vector conversion, verification and accuracy assessment are performed by means of vis-ual interpretation. Overall accuracy of the classification reached 94.6%. The verification and classifi-cation results are combined to form the final database.
This is followed by comparing the object-oriented with traditional pixel-based classification. The latter is performed using the so-called hybrid classification based on both supervised and unsuper-vised classification approaches. The traditional pixel-based approach identified only 8 classes. Com-parison of the pixel-based classification with the database obtained using the object-oriented ap-proach revealed that the former reached 72% and 61% accuracy, according to the applied method.
The article deals with the appropriation of postcolonial studies to look at Central Europe and Galicia. Beginning with the concept of“internal colonialism“, we follow the evolution of postcolonial theory from a basically economy-based concept into a poststructuralist cultural theory, presenting the development and uses of its central concepts, such as Orientalism or othering. Based on some examples, we also highlight its previous appropriation to Central Europe and the political implications it carries in this region.
A particle-level simulation technique has been developed for modelling fibre suspension flow in a converging channel of a papermachine headbox. The fibre model is represented by a chain of elements connected together. The model was verified by the simulation of rigid fibre dynamics in a simple shear flow. The period of rotation was found to be in a very good agreement with theory and reference data. The model was then employed to simulate fibre motion in a converging channel of a papermachine headbox. Fibre suspension motion was resolved using two-step procedure. Velocity field was calculated by means of a commercial CFD code ANSYS Fluent with RSM turbulence model applied and used as an input to the in-house code allowing to simulate fibre dynamics. Results of the calculations were used to construct the fibre orientation probability distribution (FOPD) which was found to be consistent with available experimental data.
Rare earth Nd-Fe-B, a widely used magnet composition, was synthesized in a shape of powders using gas atomization, a rapid solidification based process. The microstructure and properties were investigated in accordance with solidification rate and densification. Detailed microstructural characterization was performed by using scanning electron microscope (SEM) and the structural properties were measured by using X-ray diffraction. Iron in the form of α-Fe phase was observed in powder of about 30 μm. It was expected that fraction of Nd2Fe14B phase increased rapidly with decrease in powder size, on the other hand that of α-Fe phase was decreased. Nd-rich phase diffused from grain boundary to particle boundary after hot deformation due to capillary action. The coercivity of the alloy decreased with increase in powder size. After hot deformation, Nd2Fe14B phase tend to align to c-axis.
Understanding the factors that influence the quality of unmanned aerial vehicle (UAV)-based products is
a scientifically ongoing and relevant topic. Our research focused on the impact of the interior orientation
parameters (IOPs) on the positional accuracy of points in a calibration field, identified and measured in an
orthophoto and a point cloud. We established a calibration field consisting of 20 materialized points and
10 detailed points measured with high accuracy. Surveying missions with a fixed-wing UAV were carried
out in three series. Several image blocks that differed in flight direction (along, across), flight altitude
(70 m, 120 m), and IOPs (known or unknown values in the image-block adjustment) were composed. The
analysis of the various scenarios indicated that fixed IOPs, computed from a good geometric composition,
can especially improve vertical accuracy in comparison with self-calibration; an image block composed
from two perpendicular flight directions can yield better results than an image block composed from a single
flight direction.
In the article the author discusses the relationship between education and socio-cultural needs. The socio – cultural reality is the reality of a permanent change. It is difficult to describe and even more difficult to understand. The specific character of qualitatively new changes in the relations between globality and locality implies a completely new perception of reality, ways of interpreting the world, and a new quality of judgments about the condition of the modern man. This reality is also a ”multiplicity of worlds”, which means a large number of possibilities to create oneself. What individuals perceive as their ”own” has the biggest developmental potential when it is worked out on the proactivity path. proactive people are distinguished by interrelated features: the search for a possibility of change (the environment examination, going beyond limitations of a given situation), establishing effective and change oriented goals (opening new paths of action), foreseeing problems and remedia measures (the analysis of one’s own achievements, looking for signals of threats or dangers), looking for new ways of achieving goals (the ambition is to make a new tradition).
The study considers remittances as part of the lifeworlds of immigrants in multiple interactions with return intentions and communication with those left behind. This is an alternative view of the standard approach to remittances as a possible source of development or as a variable to be explained by family solidarity, investment projects or the reasons for return. The key dependent variable is the home orien-tation of immigrants as a function of remittances, return intentions and communication behaviours, measured in quantitative and typological terms. The typological analysis of home orientation diverges from the standard approach, which is in terms of high or low intensity of cross-border activities of remitting or communicating between immigrants and those they have left behind. It argues for the fact that cross-border activities combine in different ways to generate specific social types of remitting prac-tices. The remitting behaviours of migrants are, in our approach, multidimensional, encompassing eco-nomic, social and cultural content. Three hypotheses are formulated on: 1) collective deprivation in remitting money; 2) survival–development–identification strategies of migrants’ families; and 3) higher predictability of home orientation compared to economic remitting behaviours. In this context, higher predictability means greater variation of the synthetic variable of home orientation by social, cultural and economic factors as compared to the impact of the same factors on the more abstract variable of economic remittances.
In this paper deep neural networks are proposed to diagnose inter-turn short-circuits of induction motor stator windings operating under the Direct Field Oriented Control method. A convolutional neural network (CNN), trained with a Stochastic Gradient Descent with Momentum method is used. This kind of deep-trained neural network allows to significantly accelerate the diagnostic process compared to the traditional methods based on the Fast Fourier Transform as well as it does not require stationary operating conditions. To assess the effectiveness of the applied CNN-based detectors, the tests were carried out for variable load conditions and different values of the supply voltage frequency. Experimental results of the proposed induction motor fault detection system are presented and discussed.