Analysis of Coupling Segment of Belt Conveyor

2015 ◽  
Vol 647 ◽  
pp. 210-215
Author(s):  
Lenka Klakurková ◽  
Ladislav Čelko ◽  
Martin Juliš ◽  
David Jech ◽  
Jiří Švejcar
Keyword(s):  
Base Material ◽  
Design Solution ◽  
Metallographic Analysis ◽  
Component Part ◽  
Belt Conveyor ◽  
High Alloy ◽  
The Subject ◽  
Microstructure Of The Material ◽  
Eds Microanalysis

The paper focuses on the metallographic analysis of damaged belt-conveyor coupling segments made of high-alloy austenitic steel. The object in question is a weldment – a bar with a ring welded on it at either end. The subject of the analysis is the evaluation of the microstructure of the base material of the two components (weldment and weld metal), the quality of the execution of the weld joints, subsequent heat treatment of the weldment, and the overall state of the component part after operational loading. The suitability of the design solution of the whole weldment is also discussed. The problematic is solved with the aid of a metallographic analysis of the microstructure of the material, using light microscopy, scanning electron microscopy inclusive of the EDS microanalysis of chemical composition, and microhardness measurement.

Analysis of Damage of Solder Joint of Heat Exchanger

2017 ◽  
Vol 270 ◽  
pp. 63-67
Author(s):  
Pavel Gejdoš ◽  
Lenka Klakurková ◽  
Martin Juliš ◽  
Miroslava Horynová ◽  
Lucie Páleníková ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Solder Joint ◽  
Austenitic Steel ◽  
Metallographic Analysis ◽  
High Alloy ◽  
Pressure Test ◽  
The Subject ◽  
Microstructure Of The Material ◽  
Soldered Joint ◽  
Eds Microanalysis

The paper focus on the metallographic analysis of damaged heat exchanger made of high‑alloy austenitic steel by soldering. The object in question is a soldered joint of main mounting plate of the heat exchanger and first heat exchanging plate of it. In this part of the heat exchanger after the vibration and pressure test crack appeared. The subject of the analysis is the evaluation of the microstructure of the solder joint (high-alloy austenitic steel and copper), and evaluation of the appeared crack. The problematic is solved with aid of metallographic analysis of the microstructure of the material, using light microscopy and scanning electron microscopy and the EDS microanalysis of chemical composition.

scholarly journals Application of hard surfacing for repairing of agricultural parts

2013 ◽  
Vol 59 (No. 2) ◽  
pp. 61-67 ◽  
Author(s):  
J. Viňáš ◽  
J. Brezinová ◽  
A. Guzanová ◽  
M. Kotus
Keyword(s):  
Arc Welding ◽  
Base Material ◽  
Wear Test ◽  
Crushed Rock ◽  
Metallographic Analysis ◽  
Shielded Metal Arc Welding ◽  
Metal Arc Welding ◽  
Covered Electrodes ◽  
Material Wear

The contribution deals with the analysis of claddings quality realised by shielded metal arc welding with covered electrodes. For cladding, covered basic electrodes marked as E Z Fe 8 EN 14700 and E Z Fe 15 EN 14700 were used. The third type of electrode was experimentally made basic electrode with operating name EW11 (wolfram content 11%). New share made of C50R EN10083/1-98 was used as reference material. Quality of repairing deposits was evaluated by micro hardness measuring and by metallographic analysis of claddings and base material. Wear resistance of claddings was determined by weight loss during abrasive wear test by wading in following loose abrasive agents &ndash; Al<sub>2</sub>O<sub>3</sub> (corundum), crushed rock and arable soil. &nbsp;

Metallographic Analysis of Stainless Steel Inner Shaft of Centrifugal Pump

2020 ◽  
Vol 405 ◽  
pp. 223-228
Author(s):  
Pavel Gejdoš ◽  
Lenka Klakurková ◽  
Martin Juliš
Keyword(s):  
Electron Microscopy ◽  
Stainless Steel ◽  
Centrifugal Pump ◽  
Metallographic Analysis ◽  
Transmitted Power ◽  
Magnetic Clutch ◽  
Routine Work ◽  
Microstructure Of The Material ◽  
Eds Microanalysis ◽  
Scanning Electron

The paper focuses on the metallographic analysis of the damaged inner shaft of a centrifugal pump with a magnetic clutch. This pump was used for the pumping of viscous suspensions. The damaged part of the centrifugal pump was made of stainless steel and transmitted power from the magnetic clutch to the impeller of the pump. The pump was overhauled by the Manufacturer after ten years of routine work. Slightly worn parts of the pump, including the inner stainless steel shaft, were replaced by the Manufacturer according to the preserved documentation. The overhauled pump failed after two days of running in the original conditions. The problematic is solved by an analysis of three used inner shafts with the aid of a metallographic analysis of the microstructure of the material, using light microscopy and scanning electron microscopy, and an EDS microanalysis of the chemical composition and hardness measurements.

Measuring Service Quality in The Context of Higher Education in Vietnam

2013 ◽  
pp. 77-90
Author(s):  
Yen Nguyen Thi Hoang
Keyword(s):  
Higher Education ◽  
Service Quality ◽  
Exploratory Study ◽  
Measurement Scale ◽  
Education Service ◽  
The Subject

This paper focuses on the understanding of service quality in the context of Vietnamese universities. It proposes an approach for measuring the quality of the higher education service provided by universities in Vietnam. Firstly, an exploratory study was conducted. Then, the set of items which were generated became the subject of a questionnaire that was then administered to 675 students of a Vietnamese university to determine the dimensions of higher education service quality in this context. The obtained results permit us to appropriate a measurement scale which is slightly different from the SERVQUAL scale widely known as the standard for measuring service quality. The results also show that tangible elements, responsiveness and assurance seem to be three specific dimensions of the higher education service of Vietnamese universities.

Thomas More’s Correspondence in a Spanish Ambiance

Moreana ◽  
2002 ◽  
Vol 39 (Number 149) (1) ◽  
pp. 41-60 ◽  
Author(s):  
Eugenio M. Olivares Merino
Keyword(s):  
The Subject ◽  
Selection Of

The recent reprinting of Álvaro de Silva’s 1998 edition of a selection of More’s letters prompts the author to examine the subject of Spanish translations of More, and of de Silva’s general commentary on More’s correspondence and on his relationship to other humanists. The author reflects on aspects of More’s personality as exposed in his letters and uses what he finds as a corrective to several biographical misconceptions. He points out the strengths and weaknesses of de Silva’s work and compares it with that of other translators, particularly Elizabeth Rogers, and notes the particularly Spanish quality of de Silva’s edition.

From the Synergy to the Discrimination - Analysis of Attitudes and Decisions of the Prison Staff Towards Muslim Prisoners in the Context of Multicultural Education

2016 ◽  
Vol 2 (2) ◽  
pp. 81
Author(s):  
Arkadiusz Urbanek
Keyword(s):  
Multicultural Education ◽  
Social Relations ◽  
Ethnically Diverse ◽  
Prison Staff ◽  
Professional Activities ◽  
Personal Attitudes ◽  
The Subject ◽  
Pragmatic Aspects ◽  
Diverse Groups

The aspiration to keep the synergy in relations between majorities and minorities repeatedly emerges as the cause of conflicts in social relations. It is also a subject of the interest of the multicultural education, particularly in countries of Eastern Europe, building contacts with the culturally and ethnically diverse groups to a wider scale. Relations in culturally, religiously and ethnic diverse societies, are becoming more and more related to the personal attitudes and a given policy. These issues acquire in the prison circumstances even greater significance, as given moods and personal attitudes of the prison staff create the pragmatic aspects of the professional activities addressed to the sentenced. Additionally, the key role is played by the quality of the penitentiary policy and the legal culture. The article presents the comparative analysis of the research carried out in 2016 amongst the prison staff in Poland. The subject of the research concerned attitudes that influence the decisive processes. The personal relations have been analyzed in the context of the relation with the sentenced Muslims. The aim of the research was not only to reveal the quality of the decisions concerning the sentenced Muslims, but also the sources of such decisions. The latter, in consequence, may shift, as the research results prove, towards synergy or discrimination. The diversification of the discrimination was one of the intriguing aspects, disclosed at various levels that not always explicitly concerned the discrimination of the minority.

The Implementation of Learning Materials Based on Local Wisdom of Agricultural in Binjai to Improve the Students Problem Solving Abilities

2019 ◽  
Author(s):  
Nur Tsalits Fahman Mughni
Keyword(s):  
Problem Solving ◽  
Control Group ◽  
School Grade ◽  
Teaching Materials ◽  
Quasi Experimental ◽  
Equivalent Control ◽  
The Subject ◽  
And Control ◽  
Experimental Group

Teaching materials by integrating local culture makes easier for students to understand the subject matter in the learning process. The aims of the study is to measure the effectiveness of teaching materials based on local wisdom of agriculture in Binjai in improving the students problem solving abilities. The research method was a quasi experimental which use non equivalent control group in the pretest posttest design. The sample of study were students of Senior High School grade X in Binjai that consisted of experiment group which used teaching materials based on local wisdom of agriculture in Binjai and control group that used student handbooks. Teaching materials are tested by material experts and technology experts to ensure the quality of teaching materials. Data collection was conducted through test. The results showed that the teaching materials based on local wisdom of agriculture in Binjai effective in improving students problem solving abilities in the experimental group students based on the results of N gain value was 0.67 which has medium criteria. It means teaching materials based on agricultural local wisdom of agriculture in Binjai can be used as one of the teaching materials in learning activities.

UPAYA MENINGKATKAN KOMPETENSI GURU DALAM MENYUSUN RENCANA PELAKSANAAN PEMBELAJARAN MELALUI BIMBINGAN BERKELANJUTAN DI SD NEGERI 017 KUNTO DARUSSALAM TAHUN 2017

2020 ◽  
Author(s):  
Sri Winarsih
Keyword(s):  
Learning Strategies ◽  
Learning Process ◽  
School Principal ◽  
Initial Condition ◽  
Research Subjects ◽  
Analysis Techniques ◽  
Pedagogical Competence ◽  
Treatment Data ◽  
The Subject

This study aims to determine the appropriate steps in carrying out academic supervision so as to be able to improve the pedagogical competence of teachers, especially in the learning process which in turn will affect the improvement of the quality of education.The study was conducted in two cycles. Each cycle has different planning, implementation, observation and reflection. Research subjects of the principal and teacher. The school principal with his academic supervision measures, while the Kunto Darussalam Elementary School 017 teacher as an object as well as the subject in providing academic supervision treatment. Data collection techniques through class supervision with stages of supervising teachers in the learning process and observation of classroom learning, to record important events related to research, especially at the time of the processlearning takes place.Data analysis techniques that guide data processing using a percentage (%) of achievement with 100 constants. And to see the interpertation using score interpertation criteria to strengthen the interpretation in conclusions as follows: 80% - 100% (Very Good), 66% - 79 % (Good), 56% - 65% (Enough), and 40% - 55% (Less).The results showed that the ability of teachers in the implementation of the learning process experienced an increase in the percentage at each stage, from the first cycle reached an average of 63% (sufficient) and in the second cycle reached an average of 68% (good). There is an increase in teacher's ability by 5% from cycle I. In detail there is a significant increase in the initial condition of the school when compared to the final condition in the second cycle. The accuracy of teachers entering the class increased by 48%, the use of learning media increased by 32%, varied methods increased by 31%, and learning strategies increased by 36%.

An Ayurvedic Visual Rehabilitation In Lebers Congenital Amaurosis - Prospective Case Study

2018 ◽  
Vol 3 (4) ◽  
Author(s):  
Dr. Vidhyasri M ◽  
Dr. S. M. Pasha
Keyword(s):  
Marked Improvement ◽  
Clinical Case ◽  
Treatment Plan ◽  
Visual Disability ◽  
Visual Rehabilitation ◽  
Potential Risks ◽  
The Subject ◽  
Slow Frequency

Introduction: This is the case report of child who was diagnosed with LCA reported with complaints of large-amplitude, slow-frequency, roving nystagmus, frequent tendency to press on his eyes, enopthalmos, with completely normal ophthalmoscopic examination with normal appearing optic nerve and retina and has a non recordable ERG; considering this condition under the lines of Vataja Nanatmaja Vyadhi treatment was structured to render effective visual rehabilitation which showed marked results. Methods: 4 years old male child who was diagnosed with lebers congenital amaurosis was brought by his parents to Eye OPD, GAMC, Bengaluru. The presentation of this case includes bibliographic review of the subject, presentation of a clinical case and description of the importance of Ayurvedic prespective of handling of these patients. Results: The child showed improvement in fixing for light and also nystagmus showed marked improvement and there were considerable behavioural changes observed. Discussion: It is important to deepen the environment of the disease to know the possible implications in Ayurvedic management, recognize the magnitude of visual disability that our patient presents for the establishment of the treatment plan and provide an integral care of excellence in an interdisciplinary way in favor of visual rehabilitation of our patients and also help to restore quality of life with no potential risks of side effects.

Effects of structural inhomogeneities on the steel balls resistance to loading

2020 ◽  
pp. 29-38
Author(s):  
O. B. Berdnik ◽  
I. N. Tsareva ◽  
L. A. Krivina ◽  
S. V. Kirikov ◽  
S. I. Gerasimov ◽  
...  
Keyword(s):  
Brittle Fracture ◽  
Bearing Steel ◽  
Metallographic Analysis ◽  
Structural Factors ◽  
Steel Shkh15 ◽  
Maximum Hardness ◽  
High Shock ◽  
Steel Balls ◽  
Plasticity Coefficient ◽  
Microstructure Of The Material

When conducting impact tests of protective glasses, nonunique cases of destruction of balls made of bearing steel ShKh15 were recorded. The causes of their destruction were determined. The state of the material was studied by fractographic and metallographic analysis, hardness and microhardness measurement. In the structure of the metal of all the balls, no critical defects were found such as flockens, shells and microcracks, but adverse factors were detected in the microstructure of the material, namely, the presence of fineneedle martensite with excessive carbides. It is established that the detected structural factors lead to liability to brittle fracture, an increase in the hardness of the material, a decrease in plasticity. To prevent brittle fracture of the balls and provide a reserve of plasticity of steel ShKh15 at high shock loads assessment calculations of ductility coefficient were made; and it was recommended to limit the maximum hardness of the material critical value HV=5.70 HPa (54 HRC), with the corresponding plasticity coefficient equal to 0.8.

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