scholarly journals The Impact of the Melting and Pouring Process on the Quality of the Biggest Rocking Bell Called Vox Patris

2019 ◽  
Vol 1 (1) ◽  
pp. 230-237
Author(s):  
Dariusz Bartocha ◽  
Czesław Baron
Keyword(s):  
Liquid Metal ◽  
Computer Simulations ◽  
Final Stage ◽  
Gating System ◽  
System Parameters ◽  
University Of Technology ◽  
Filling System ◽  
Alloy Properties ◽  
The Impact

Abstract The paper describes the process of melting, metalworking and pouring the form of the world's largest 55-ton rocking bell called Vox Patris. The project was carried out by Pracownia Ludwisarska of Jan Felczyński from Przemyśl in cooperation with Rduch Bells & Clocks from Czernica and Metalodlew SA from Kraków. Comprehensive scientific and technical support of the project was provided by the Department of Foundry of the Silesian University of Technology. The bell is made of bronze, which is an alloy of copper and tin with a content of tin at the level of 20%. The foundry, where the melting and pouring process took place, had two 14 ton electric furnaces, 15 ton transport pouring ladle and a 60 ton collection ladle. Therefore, it was necessary to determine the minimum temperature of the pouring and the conditions for holding the liquid metal so that the metal from the first cast would not solidify before accumulating its total amount (four melts) (Bartocha and Baron, 2015; Bartocha and Baron, 2016). The study presents the tests of alloy properties and a series of computer simulations. Thanks to them the maximum and minimum permissible temperature of metal overheating has been determined (Bartocha, 2017). The final stage of the cast was the mold pouring process. The filling system was responsible for the correct performance of this process. This system comprised a tank (collector) under a doublestopper 60-ton main ladle, an eleven-meter tapping spout, an infusion tank and a downgate. The task of the gating system is uniform and continuous supply of liquid metal to the mold until it is completely filled. The unusual layout, that was used, required checking many factors. Various configurations of the system parameters have been tested based on the series of computer simulations (Czochlarski and Bukowski, 1935; Ignaszak, 1999).

scholarly journals Quality of outdoor and indoor environment during the cruise of the tall ship STS Fryderyk Chopin

2018 ◽  
Vol 49 ◽  
pp. 00024
Author(s):  
Szymon Firląg
Keyword(s):  
Relative Humidity ◽  
Ventilation System ◽  
Pm 2.5 ◽  
The North ◽  
University Of Technology ◽  
Open Sea ◽  
The North Sea ◽  
Pm 10 ◽  
The Impact

The aim of this paper is to present the results of measurements, on the quality of internal and external environment, carried out during the cruise of the tall ship STS Fryderyk Chopin. The cruise took place between 16th and 30th September 2017 as part of the scientific seminar of the Warsaw University of Technology (WUT) on the Wave, addressed to students of the WTU. After leaving the port of Edinburgh, crossing the North Sea, the Danish straits, stops in Copenhagen and Kołobrzeg, the tall ship reached Szczecin after two weeks. The measurements carried out on the deck included the temperature and relative humidity of the indoor air in three cabins and the men’s bathroom. In two cabins, the CO2 concentration was measured additionally. The outdoor temperature, relative humidity and concentration of PM 1.0, PM 2.5 and PM 10 were also measured. The obtained results allowed to assess the quality of the internal environment in accordance with the standards and to analyze the effectiveness of the mechanical ventilation system. Measurements of particulate matter have shown significant differences between outdoor air quality in the open sea and in ports or near major shipping routes. It turned out that the impact of emissions from passing ships using diesel engines is clearly visible.

scholarly journals Accreditation of research in the thermo-climatic chamber - various aspects

2018 ◽  
Vol 183 ◽  
pp. 01009
Author(s):  
Artur Gawlik ◽  
Piotr Kucybała ◽  
Danuta Owczarek ◽  
Janusz Pobędza
Keyword(s):  
Quality Management ◽  
Environmental Conditions ◽  
Quality Management System ◽  
New Products ◽  
Heavy Duty ◽  
Climatic Chamber ◽  
High Quality ◽  
University Of Technology ◽  
The Impact

One of the important aspects in the implementation of new products for production in the open field is the assessment of the impact of environmental conditions on their operation. Typically thermo-climatic research is carried out for such project. The laboratory of Techno-climatic Research and Heavy Duty Machines of Cracow University of Technology, equipped with a large-sized thermo-climatic chamber conducts this type of research. Bearing in mind the assurance of high quality of the conducted research, the quality management system (QMS) was developed and implemented. The article describes the requirements, scope and process of obtaining a Polish Centre for Accreditation (PCA) certificate.

Mobility of Engineering and Technology Professionals and its Impact on the Quality of Engineering and Technology Education

2011 ◽  
Vol 1 (2) ◽  
pp. 35-49
Author(s):  
Fredreck Chinyemba
Keyword(s):  
Technology Education ◽  
Research Output ◽  
Engineering And Technology Education ◽  
University Of Technology ◽  
Scientific Research Output ◽  
Engineering And Technology ◽  
Negative Effect ◽  
Part Time ◽  
The Impact

This study explores the impact of mobility of qualified and experienced engineering and technology lecturers on the quality of engineering and technology education. A structured questionnaire was used to collect data from students, lecturers, Heads of Departments and Academic Deans at Chinhoyi University of Technology, Zimbabwe. The findings from this study indicate that the absence of experienced and qualified professionals has a negative effect on the quality of engineering and technology education. The lecturer’s experience is considered a rich legitimate source of quality. Findings also reveal that the use of teaching assistants and part time lecturers as an alternative to experienced professionals, coupled with lack of resources, adversely impacted on the quality of graduates from the institution. Essentially, lectures conducted were characterized by poor instructional delivery, rushing through courses and over burdened lecturers. Scientific research output was significantly low and productive time was being wasted on human resource issues.

scholarly journals Postoperative Quality of Life after Single-Visit Root Canal Treatment Performed with Reciprocating Shaping Systems: An Observational Study

2020 ◽  
Vol 11 (1) ◽  
pp. 273
Author(s):  
Stefania Multari ◽  
Mario Alovisi ◽  
Elio Berutti ◽  
Stefano Corbella ◽  
Silvio Taschieri ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Postoperative Pain ◽  
Root Canal ◽  
Statistical Significance ◽  
Primary Root ◽  
Root Canal Treatment ◽  
Single Visit ◽  
Alloy Properties ◽  
The Impact

Postoperative pain is a frequent complication of root canal treatment. It could worse patients’ quality of life (QoL) and it may be associated to several factors, including the shaping technique. The aim of the study was to compare the impact of WaveOne Gold (WOG) and WaveOne Classic (WOC) reciprocating instrumentation on postoperative QoL after single-visit primary root canal treatment. Healthy subjects with pulp necrosis on multirooted teeth were observed. Canal shaping was performed with WaveOne Gold Primary (n = 25) or WaveOne Classic Primary (n = 29) and canal filling was completed with a carrier-based technique. Mean and maximum scores for postoperative pain were assessed through a Visual Analogue Scale (VAS) and QoL indicators were evaluated with a self-assessment questionnaire based on a Likert scale. Postoperative pain curves were similar in both groups (mean pain p = 0.43; maximum pain p = 0.27) and quality of life indicators showed no significant differences (p > 0.05). There was a more favourable trend of QoL values in the WOG group, reaching statistical significance on day six posttreatment (p = 0.021). Within the limitations of the study, reciprocating instrumentation may have an impact on patients’ QoL, but the innovative geometrical and alloy properties of the WaveOne Gold seemed to induce a faster resolution of the postoperative symptoms.

Role of Self Phase Modulation and Cross Phase Modulation on Quality of Signal in Optical Links

2019 ◽  
Vol 13 ◽  
Author(s):  
Karamjit Kaur ◽  
Anil Kumar
Keyword(s):  
Optical Networks ◽  
Phase Modulation ◽  
Input Power ◽  
Wdm Networks ◽  
Signal Power ◽  
Optical Links ◽  
System Parameters ◽  
Quality Of Transmission ◽  
The Impact

Background: In WDM networks, there is a crucial need to monitor signal degradation factors in order to maintain the quality of transmission. This is more critical in dynamic optical networks as non-linear impairments are network state dependent. Moreover, PLIs are accumulative in nature, so the overall impact is increased tremendously as the length of signal path is increased. The interactions between different impairments along the path also influence their overall impact. Objective: Among the different impairments, the present work focus on phase modulations owing to intensities of signals themselves as well as the neighboring signals. It includes the influence of SPM, SPM and XPM, system parameters like signal power, wavelength and fiber parameters like attenuation coefficient, dispersion coefficient and their influence on Q-value and BER. Method: The analysis is done through a single and two-channel transmitter system with varied power, wavelengths and system parameters. The corresponding optical spectrums are analysed. Result & Conclusion: It has been found that SPM and XPM pose broadening effect on spectrum without any effect on temporal distributions. The magnitude of signal power is among the parameters significantly influencing the broadening of spectrum. Higher is the power, more is the magnitude of broadening. It has been found that in order to neglect the impact of input power; its magnitude must be kept below 20 mW. Also, the dispersion and attenuation value need to be carefully as they pose counteracting effect to SPM and XPM for certain values and hence can be used as compensation measure without any additional cost.

Optimisation of the Deoxidation Degree and Modification on the Cast Steel Properties Improvement at Low Temperature

2013 ◽  
Vol 58 (3) ◽  
pp. 763-767
Author(s):  
Z. Sierant
Keyword(s):  
Low Temperature ◽  
Liquid Metal ◽  
Impact Strength ◽  
Directional Solidification ◽  
Cast Steel ◽  
Steel Grade ◽  
Gating System ◽  
The Impact ◽  
Steel Properties ◽  
Selection Of

Abstract Industrial conditions of obtaining thick-walled and shaped castings intended for operations at temperatures: minus 40÷60°C are presented in the paper. The selection of a cast steel grade is based on known studies [1,10,14], however due to castings wall thickness (70-240mm), the way of preparing liquid metal (deep deoxidation and modification, argon stirring in a ladle) and conditions of filling mould cavities (gating system assuring quiet filling, directional solidification and avoiding a formation of inessential heat centres), were developed to assure the required impact strength. Maintaining these parameters as well as the selection of heat treatments for the produced massive castings allowed to achieve the impact strength over 50 J/cm2 at minus 40°. This value was obtained for walls of various thickness

Self-Compassion and Quality of Life in Adults Who Stutter

2020 ◽  
Vol 29 (4) ◽  
pp. 2097-2108
Author(s):  
Robyn L. Croft ◽  
Courtney T. Byrd
Keyword(s):  
Quality Of Life ◽  
Social Connectedness ◽  
The Self ◽  
Future Research ◽  
Self Compassion ◽  
Adults Who Stutter ◽  
And Gender ◽  
Relationship Of ◽  
The Impact

Purpose The purpose of this study was to identify levels of self-compassion in adults who do and do not stutter and to determine whether self-compassion predicts the impact of stuttering on quality of life in adults who stutter. Method Participants included 140 adults who do and do not stutter matched for age and gender. All participants completed the Self-Compassion Scale. Adults who stutter also completed the Overall Assessment of the Speaker's Experience of Stuttering. Data were analyzed for self-compassion differences between and within adults who do and do not stutter and to predict self-compassion on quality of life in adults who stutter. Results Adults who do and do not stutter exhibited no significant differences in total self-compassion, regardless of participant gender. A simple linear regression of the total self-compassion score and total Overall Assessment of the Speaker's Experience of Stuttering score showed a significant, negative linear relationship of self-compassion predicting the impact of stuttering on quality of life. Conclusions Data suggest that higher levels of self-kindness, mindfulness, and social connectedness (i.e., self-compassion) are related to reduced negative reactions to stuttering, an increased participation in daily communication situations, and an improved overall quality of life. Future research should replicate current findings and identify moderators of the self-compassion–quality of life relationship.

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