On small-time similarity-solution behaviour in the solidification shrinkage of binary alloys

2020 ◽  
pp. 1-27 ◽  
Author(s):  
M. ASSUNÇÃO ◽  
M. VYNNYCKY ◽  
S.L. MITCHELL
Keyword(s):  
Similarity Solution ◽  
Spatial Domain ◽  
Small Time ◽  
General Situation ◽  
Eutectic Solidification ◽  
Liquid Phases ◽  
The One ◽  
Future Work ◽  
Solution Behaviour ◽  
Short Times

In the one-dimensional solidification of a binary alloy undergoing shrinkage, there is a relative motion between solid and liquid phases in the mushy zone, leading to the possibility of macrosegregation; thus, the problem constitutes an invaluable benchmark for the testing of numerical codes that model these phenomena. Here, we revisit an earlier obtained solution for this problem, that was posed on a semi-infinite spatial domain and valid for the case of low superheat, with a view to extending it to the more general situation of a finite spatial domain, arbitrarily large superheat and both eutectic and non-eutectic solidification. We find that a similarity solution is available for short times which contains a boundary layer on the liquid side of the mush–liquid interface; this solution is believed to constitute the correct initial condition for the subsequent numerical solution of the full non-similar problem, which is deferred to future work.

scholarly journals Mathematical Models for Predicting the Biodiesel Properties

2020 ◽  
Vol 9 (5) ◽  
pp. 2362-2376
Keyword(s):  
Fatty Acid ◽  
Physical Properties ◽  
Good Accuracy ◽  
Regression Coefficient ◽  
Cetane Number ◽  
High Accuracy ◽  
Good Relationship ◽  
Combine Fatty Acid ◽  
The One ◽  
Future Work

Density, viscosity and cetane number are important physical properties of biodiesel as they participate in one way or another in the fuel metering, calibration and nozzle process during combustion. High and good accuracy of the physical properties of biodiesel will therefore lead to improved combustion and therefore better efficiency. The aim of this study is therefore to seek good and high precision by combining properties and comparing the analysis between ANN and RSM. Studies have been made by researchers to collect data. In this study the combination of properties is exploited. A total of 1360 data from the various studies has been collected and exploited. From this data after elimination and treatment 39 possible combinations were analyzed and compared by ANN and RSM. The result of simulation is: The best combinations: 𝝆 = 𝒇(𝑭𝒂) , 𝝂 = 𝒇(𝑭𝒂) , 𝒄𝒏 = 𝒇(𝑭𝒂) with 𝑹 𝟐 respectively equal to (0.9998, 0.9998 , 0.9987) and R equal to ( 0.9997,0.99971,0.9984) obtained with ANN simulation provide more accuracy than 𝑹 𝟐 ( 0.912 , 0.799 , 0.766 ) and R ( 0.837, 0.739 , 0.920) obtained with RSM simulation in general 𝑹 𝟐 obtained with ANN (0.9998, 0.9998 , 0.9987) provide good accuracy than 𝑹 𝟐 (0.9112,0.799,0.766) obtained with RSM . Also there is a good relationship between fatty acid and others properties since they provide good result. In general the overall regression coefficient R and the correlation coefficient 𝑹 𝟐 values of the combinations obtained in the simulation with the ANN provide better and good accuracy since their values are close to each other and all close to 1, and their mse tend towards 0. While the one obtained with RSM are distant from each other and distant of 0 so they provide an acceptable accuracy.it is also important to note that high accuracy of properties using RSM must have at least combination of three parameters. Also after every combination, the conclusion says there is a good relationship between fatty acid and other properties. Then for the future work, it will be benefit to combine fatty acid with others properties and evaluate result, also use another network to simulate.

scholarly journals Design and Implementation of a Virtual Reality System for Treating Highway Phobias: VRStreet

2018 ◽  
Author(s):  
Jorge A Fuentes ◽  
Rodrigo Nieto ◽  
Francisca Melis ◽  
Luz María González ◽  
Gonzalo Mauricio Rojas ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Steering Wheel ◽  
Specific Situation ◽  
Virtual Reality System ◽  
Patient Will ◽  
Normal Human ◽  
Immersive Environment ◽  
The One ◽  
Future Work ◽  
Physical Responses

To feel fear in a specific situation is a normal human experience, however, when this fear or aversion becomes excessive and disrupts the day to day life of an individual, it is said the person suffers from a type of anxiety disorder called phobia. One common type of treatment for phobias is exposure therapy (professionals expose the patient gradually to the feared object or situation).The objective of this paper is to implement a Virtual Reality system that simulates a real highway environment which allows to treat patients affected by highway phobias in a safe place.In cooperation with psychologists and psychiatrists, an action protocol was conducted to create and recreate the variables of the virtual environment to which the patient will be subjected to. Once this was completed, a Virtual Reality application was made that simulates a realistic highway which includes exits, overpasses, underpasses, and tunnels, among others.This hardware/software system will include Oculus Rift DK2 VR glasses in order to create an immersive environment that the patient can consider real and who will be able to interact with it. The performance of the vehicle was programmed through physical responses similar to reality as well as techniques of artificial intelligence in the vehicles that will interact with the one controlled by the patient. Also, this system includes a steering wheel, pedals, and a gearshift (manual or automatic).We think that this system will contribute to treating highway phobias, allowing the psychiatrist or psychologist to carry out therapy in an appropriate manner and through the support of technology the professional will have the ability to simulate the anxiogenic environment in a realistic manner so as to achieve effective treatment. In a future work, we must quantify the possible benefits of this type of VR system in phobia patients.

scholarly journals Analytical results in transient brush tyre models: theory for large camber angles and classic solutions with limited friction

Meccanica ◽  
2021 ◽  
Author(s):  
Luigi Romano ◽  
Francesco Timpone ◽  
Fredrik Bruzelius ◽  
Bengt Jacobson
Keyword(s):  
Rolling Direction ◽  
State Theory ◽  
General Situation ◽  
Linear Dynamical Systems ◽  
Transient Conditions ◽  
One Dimensional ◽  
Analytical Results ◽  
Classic Theory ◽  
Uniqueness Of The Solution ◽  
The One

AbstractThis paper establishes new analytical results in the mathematical theory of brush tyre models. In the first part, the exact problem which considers large camber angles is analysed from the perspective of linear dynamical systems. Under the assumption of vanishing sliding, the most salient properties of the model are discussed with some insights on concepts as existence and uniqueness of the solution. A comparison against the classic steady-state theory suggests that the latter represents a very good approximation even in case of large camber angles. Furthermore, in respect to the classic theory, the more general situation of limited friction is explored. It is demonstrated that, in transient conditions, exact sliding solutions can be determined for all the one-dimensional problems. For the case of pure lateral slip, the investigation is conducted under the assumption of a strictly concave pressure distribution in the rolling direction.

scholarly journals Training Public Health Professionals to Tackle Women, Children, and Families Health Issues: A “Skill-Based Qualitative Learning Approach”

2021 ◽  
Vol 9 ◽  
Author(s):  
Cecilia Obeng
Keyword(s):  
Public Health ◽  
Health Professionals ◽  
Teaching And Learning ◽  
Learning Approach ◽  
Learning Approaches ◽  
Health Issues ◽  
Children And Families ◽  
Arduous Task ◽  
The One ◽  
Future Work

Purpose: There are several teaching and learning approaches but finding the one that is appropriate for a particular field or training program is an arduous task. The purpose of this paper is to introduce the “Skill Based Qualitative Learning Approach” (SBQLA) in training health professionals.Description: The SBQLA is a pedagogical approach via which learners are trained in developing qualitative questionnaires and interview skills to learn from experts in the Public Health (PH) field. This teaching approach arms students with interview skills that help them identify and address PH roadblocks and get them authentic information from experts. It also equips them with techniques on how to do formalized presentations and come up with projects and interventions that help mitigate and eliminate drivers of health problems among women, children and families.Assessment: Learners' field experiences are shared in a professional presentation style in a class to help trainees benefit from each other's information and to get formalized feedback on their presentation. Assessment in this learning approach is based on a synthesis and an analysis of data collected from professionals.Conclusion: Findings from this learning approach enables experts to shed light on true stories shared by real and authentic individuals whose faces can be associated with their shared experiences. This learning approach makes it possible for trainees to also initiate projects that help them tackle existing and emerging public health issues in their future work.

scholarly journals The Figure of Distrust: Prince A.S. Menshikov in the Maritime Department during the Period of Reforms, 1826–1828

2020 ◽  
Vol 4 (3) ◽  
pp. 702-733
Author(s):  
Kseniya V. Donik
Keyword(s):  
Methodological Approach ◽  
The Other ◽  
General Situation ◽  
Functional Characteristics ◽  
Problem Context ◽  
Agent Based ◽  
The One ◽  
First Time ◽  
Official Records

The article considers the role of Prince A. Menshikov as a specific type of agent of supreme authority in the process of reforming the maritime administration. The problem context of reforms resulted from the involvement of the naval generals and officials in abuses, which was a consequence of nepotism and unrest in the navy. The involvement of sailors in the Decembrist revolt significantly affected the attitude of the tsar to the general situation in the naval environment. Distrustful of the existing naval administration, Nicholas I needed an intermediary who would implement his idea of the arrangement of the navy on the one hand, and provide him with an objective “impartial” account of maritime problems, on the other hand. As a result of that, Adjutant General Prince A. Menshikov, who had had nothing to do with the naval service earlier, joined the navy to become the monarch’s agent in charge of the naval issues in the bodies of autocratic authority. The objective of the article is to identify the functions of such an agent based on the example of the Maritime Department. The sources of the article include official records and personal documents, some of which are introduced into scientific circulation for the first time. The principal methodological approach to the problem under study is an attempt to bring the appointment of Menshikov beyond the scope of narrow departmental history which was based on the unmotivated decision of the emperor and to propose an interpretation of the events in the context of tsarist government via agents, which has already been described in historiography. The author makes a conclusion about the interconnection between the crisis in the naval department, the attitude of the supreme authority towards it, and the appearance of the monarch’s agent with a number of his own functional characteristics.

Roughness sub-layer wind speed model for tropical wooded areas

2022 ◽  
pp. 0309524X2110500
Author(s):  
Gustavo Richmond-Navarro ◽  
Mariana Montenegro-Montero ◽  
Pedro Casanova-Treto ◽  
Franklin Hernández-Castro ◽  
Jorge Monge-Fallas
Keyword(s):  
Artificial Intelligence ◽  
Wind Speed ◽  
Functional Relationship ◽  
Polynomial Function ◽  
Evolutionary Search ◽  
Search Technique ◽  
Humidity Sensors ◽  
Wind Speeds ◽  
The One ◽  
Future Work

There are few reports in the literature regarding wind speed near the ground. This work presents a model for wind speed from 4 m above the ground, based on year-round measurements in two meteorological towers. Each tower is equipped with anemometers at five heights, as well as thermometers and pressure and relative humidity sensors. The data is processed using Eureqa artificial intelligence software, which determines the functional relationship between variables using an evolutionary search technique called symbolic regression. Using this technique, models are found for each month under study, in which height and temperature are the variables that most affect wind speed. The model that best predicts the measured wind speeds is then selected. A polynomial function directly proportional to height and temperature is identified as the one that provides the best predictions of wind speed on average, within the rough sub-layer. Finally, future work is identified on testing the model at other locations.

Conclusion

2020 ◽  
pp. 243-252
Author(s):  
Ted Nannicelli
Keyword(s):  
Moral Psychology ◽  
Applied Ethics ◽  
The Other ◽  
Ethical Criticism ◽  
Artistic Creation ◽  
Fine Grained ◽  
Parallel Path ◽  
Ethical Context ◽  
The One ◽  
Future Work

This chapter summarizes the book’s central claims and looks at paths for future work on the applied ethics of artistic creation and ethical criticism. It suggests the need for two parallel strands of inquiry: On the one hand, as the term “applied ethics” suggests, there is a need for a finer-grained understanding of both the artistic and ethical contexts of artistic creation—an understanding that will need to be informed by research across a number of fields, including anthropology, art history, and moral psychology. On the other hand, whatever details of that context are revealed by this fine-grained analysis, there will be a more abstract conceptual challenge about how to reconcile the norms of that art-historical and ethical context with those in currency in the art-historical and ethical context from which one is judging the work. So, the parallel path of inquiry is in metaethics.

scholarly journals Cytotaxonomic considerations on the sex chromosome variation observed within Acomys ngurui Verheyen et al. 2011 (Rodentia Muridae)

Zootaxa ◽  
2012 ◽  
Vol 3493 (1) ◽  
pp. 35 ◽  
Author(s):  
RICCARDO CASTIGLIA ◽  
FLAVIA ANNESI
Keyword(s):  
New Species ◽  
Dna Sequences ◽  
Sex Chromosome ◽  
East African ◽  
Chromosome Variation ◽  
Mtdna Sequence ◽  
Two New Species ◽  
Morphologic Analysis ◽  
The One ◽  
Future Work

The taxonomy of the East African Muridae belonging to the Acomys spinosissimus Peters 1852 species complex has been recently revised (Verheyen et al., 2011). Two new species have been described by means of external morphologic analysis, craniometry, enzymes, mitochondrial DNA sequences and karyological information. For one of the two new species, Acomys ngurui Verheyen et al. 2011, a polymorphic karyotype has been observed. In fact, for 19 of the 22 karyotyped individuals, the karyotype is identical to the one described for A. spinosissimus s. s. (2n = 60, aFN = 68), characterized by a sex chromosome constitution of the XX/XY type, with an acrocentric X and a submetacentric Y (Dippenaar and Rautenbach, 1986). The remaining three females possess a karyotype that resembles the one reported by Matthey (1965) and Barome et al. (2001) characterized by a unique giant metacentric X chromosome (Xg), and by a variable diploid number (2n = 59–62). These females were found in the three localities in Tanzania together with specimens with the typical ‘spinosissimus’ karyotype. Specimens carrying the Xg were not distinguishable on the basis of their mtDNA sequence or morphology from the other specimens with XY karyotype (Verheyen et al., 2011). The authors concluded that the available evidence did not allow one to give taxonomic value to this chromosomal configuration, characterized by a particular sex determination, hoping for future work that will study the animals bearing this typical karyotype in more detail.

scholarly journals Comparing Approaches for Evaluating Digital Interventions on the Shop Floor

Technologies ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 116 ◽  
Author(s):  
Francisco Lacueva-Pérez ◽  
Lea Hannola ◽  
Jan Nierhoff ◽  
Stelios Damalas ◽  
Soumyajit Chatterjee ◽  
...  
Keyword(s):  
Industry 4.0 ◽  
Shop Floor ◽  
Use Case ◽  
Individual Level ◽  
Ict System ◽  
The One ◽  
Comparison Of The Results ◽  
Future Work ◽  
Self Learning ◽  
Smart Factories

The introduction of innovative digital tools for supporting manufacturing processes has far-reaching effects at an organizational and individual level due to the development of Industry 4.0. The FACTS4WORKERS project funded by H2020, i.e., Worker-Centric Workplaces in Smart Factories, aims to develop user-centered assistance systems in order to demonstrate their impact and applicability at the shop floor. To achieve this, understanding how to develop such tools is as important as assessing if advantages can be derived from the ICT system created. This study introduces the technology of a workplace solution linked to the industrial challenge of self-learning manufacturing workplaces. Subsequently, a two-step approach to evaluate the presented system is discussed, consisting of the one used in FACTS4WORKERS and the one used in the “Heuristics for Industry 4.0” project. Both approaches and the use case are introduced as a base for presenting the comparison of the results collected in this paper. The comparison of the results for the presented use case is extended with the results for the rest of the FACTS4WORKERS use cases and with future work in the framework.

Levensbeschouwing: een vak dat er toe doet

2007 ◽  
Vol 61 (4) ◽  
pp. 308-318
Author(s):  
Guido Versteegh
Keyword(s):  
Religious Education ◽  
Civic Education ◽  
Personal Development ◽  
World View ◽  
General Situation ◽  
Religious Learning ◽  
Recent Developments ◽  
The Subject ◽  
State Of Affairs ◽  
The One

The subject of this contribution is the present state of affairs regarding religious education and the teaching of worldviews (Dutch: ‘levensbeschouwing’) on the one hand and the quality of the textbooks used on the other. The approach is that of a teacher in secondary education. The author starts by giving a brief outline of the general situation of religious education in the Netherlands. Then he deals with the significance of religious learning for the personal development of young people and asks how the subject should be taught. If it is to contribute to social cohesion and civic education it will have to aim at the development of a personal identity. These aims imply that both teachers and textbooks should meet certain standards with regard to didactics and professionalism. The author argues that due to recent developments, such as the so-called ‘new learning’, religious education and world view education can potentially fulfil a pivotal role for all ongoing learning processes in the schools.

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