scholarly journals Effects of Casting Conditions for Reduced Pressure Test on Melt Quality of Al-Si Alloy

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1422
Author(s):  
Ho Sung Jang ◽  
Ho Jung Kang ◽  
Jin Young Park ◽  
Yoon Suk Choi ◽  
Sunmi Shin
Keyword(s):  
Sampling Method ◽  
Hydrogen Diffusion ◽  
Heating Temperature ◽  
Reduced Pressure ◽  
Hydrogen Diffusion Coefficient ◽  
Atmospheric Exposure ◽  
Pressure Test ◽  
The Difference ◽  
The One

The present study investigated the effect of the casting conditions for the reduced pressure test (RPT) on the melt quality of Al-Si alloy. The casting conditions considered in RPT were the atmospheric exposure during melting, sampling method, and mold pre-heating temperature. Density Index (DI) was measured to quantify the melt quality of the Al-Si alloy casted with the different casting conditions for the RPT. The sample with blocking atmospheric exposure during melting was 5.6% lower in DI than the one without blocking. DI showed a 1.9% gap between scooping-out and pouring sampling methods. Increasing mold pre-heating temperature from 100 °C to 250 °C increased the DI of the alloy from 8.5% to 18.7%. On the other hand, when the mold pre-heating temperature was 350 °C, the DI of the alloy dropped sharply to 0.9%. The melt quality of the alloys was analyzed by measuring the pores and microstructure and simulating the solidification of the samples. It was presumed that the oxides and inclusions in the molten alloys caused the difference in DI according to the atmospheric exposure and the sampling method. The difference in DI according to the mold pre-heating temperature could be understood by calculating the solidification starting time and hydrogen diffusion coefficient during the solidification of the alloys in RPT.

scholarly journals Hydrogen Diffusion Coefficient, Hydrogen Solution Coefficient and Hydrogen Permeability of Nb-TiNi Eutectic Alloy

2010 ◽  
Vol 638-642 ◽  
pp. 1131-1136
Author(s):  
Wei Liang Wang ◽  
Kazuhiro Ishikawa ◽  
Kiyoshi Aoki
Keyword(s):  
Diffusion Coefficient ◽  
Hydrogen Absorption ◽  
Hydrogen Diffusion ◽  
Hydrogen Permeability ◽  
K Value ◽  
Hydrogen Flow ◽  
Hydrogen Diffusion Coefficient ◽  
High K ◽  
Pressure Region ◽  
The Difference

In general, hydrogen permeabilityΦ of the alloy membrane is expressed as the product of the hydrogen diffusion coefficient D and the hydrogen solution coefficient K. Therefore, to improve the hydrogen permeability efficiently, the values of K and D should be separately considered. In the present study, hydrogen absorption and permeation behaviors of the Nb19Ti40Ni41 alloy consisting of the eutectic phase are investigated by measuring pressure-composition-isotherm (PCI) and by the hydrogen flow method and compared with those of palladium. The hydrogen absorption in the Nb19Ti40Ni41 alloy does not obey the Sieverts’ law in the pressure region of 0-1.0MPa at 523K, but it shows linear relationship between the difference in the square root of hydrogen pressure and hydrogen content between 0.1 and 0.4MPa. Although the value of D for the Nb19Ti40Ni41 alloy is considerably lower than that of palladium, its high K value enhances the hydrogen permeability Φ. It is suggested that the enhancement of D by microstructural control for Nb19Ti40Ni41 alloy is effective for improvement of Φ.

scholarly journals A Comparative Study of Male and Female Hostlers on Spirituality and Quality of Life

2016 ◽  
Vol 3 (2) ◽  
Author(s):  
Deoshree Akhouri ◽  
Kehksha ◽  
S. A. Azmi
Keyword(s):  
Quality Of Life ◽  
Graduate Students ◽  
Sampling Method ◽  
Subjective Feeling ◽  
Male And Female ◽  
Domains Of Life ◽  
The Difference ◽  
Religious Systems ◽  
Daily Spiritual Experience Scale

Spirituality may refer as a subjective feeling and experiences that occur both within and outside of traditional religious systems that influence various domains of life e.g. physical health, mental health, optimism, resilience and quality of life. The aim of the present study is to explore the relation between spirituality and quality of life in male and female hostlers. To accomplish the goal of study, we selected 100 girls and 100 boys post graduate students from Aligarh Muslim University through random sampling method. The entire participants were hostlers whom age ranges from 18-24 years. We applied Daily spiritual experience scale (DSES) and WHOQOL-BREF on the participants to collect data. We analyzed data with the help of t-test and Pearson product moment co-efficient of correlation. The results indicate positive relationship between spirituality and quality of life. Result also shows the difference between male and female hostlers on spirituality and quality of life.

scholarly journals APLIKASI QUALITY FUNGTION DEPLOYMENT (QFD) PADA PENINGKATAN MUTU SUWAR SUWIR TAPE HANDAYANI 82 DI KABUPATEN BONDOWOSO

2018 ◽  
Vol 12 (01) ◽  
pp. 1
Author(s):  
Ade Galuh Rakhmadevi ◽  
Sih Yuwanti ◽  
Bambang Herry Purnomo
Keyword(s):  
Sampling Method ◽  
Heating Temperature ◽  
Mixing Time ◽  
Research Result ◽  
Heating Time ◽  
Raw Material ◽  
Quality Attribute ◽  
Fixed Composition ◽  
Acidity Level

The intensity industrial competition required Tape Handayani 82 factory to develop its quality to compete in the market. The development of quality could be done by searching information about quality attribute of suwar suwir as costumer expectation. The purpose of this research was to identify quality attribute of suwar suwir and technical response requiring improvement, which could fulfill costumer expectation. Data was taken by distributing questionnaire to 65 respondents with non probability sampling method at 4 subdistrict in Bondowoso Regency, and interview to the producer of suwar suwir “Tape Handayani 82”. The research result showed that the quality attributs that needed to be improved were the fixed composition, the self life of the product, the fixed texture, the label of composition, the suitability of the product with the label, the taste variation and packaging form. The technical responses which improved in relation to quality improvement were the composition of the additional materials, the composition of the raw material, the maturity of the tape, the heating temperature, the heating time, the acidity level the tape, the stirring technique, the mixing time, the primary packaging type, smoothing technique, chilling time and fiber removal. The target value to the technical response of the Handayani 82 factory was less than the bencmark. This mean that suwar suwir of Tape Handayani 82 has not met the target in fulfilling the quality of suwar suwir as costumer expectation. Keywords: quality, suwar suwir, quality function deploment (QFD), customer

The Study of Hydrogen Accumulation Dynamics in Ti-6Al-4V Nanocrystalline Alloy

2015 ◽  
Vol 1097 ◽  
pp. 17-21
Author(s):  
Nikita O. Pimenov ◽  
Nikolay N. Nikitenkov ◽  
Vladimir S. Sypchenko ◽  
Ekaterina N. Stepanova ◽  
Yurii I. Tyurin
Keyword(s):  
Vacuum Chamber ◽  
Hydrogen Diffusion ◽  
Nanocrystalline Structure ◽  
Nanocrystalline Alloy ◽  
Electrolytic Cell ◽  
Hydrogen Diffusion Coefficient ◽  
Nanocrystalline Titanium ◽  
Hydrogen Accumulation ◽  
The One ◽  
Effective Hydrogen

This work presents the results of hydrogen diffusion study in macro-and nanocrystalline titanium using the method of combining an electrolytic cell with vacuum chamber through the membrane. It has been stated that the formation of nanocrystalline structure, on the one hand, leads to the decrease in the effective hydrogen diffusion coefficient and, on the other hand, to the increase in the capability to accumulate hydrogen. This is observed due to more developed grain boundaries in nanocrystalline samples as compared with macrocrystalline.

Headlining in Translation

Target ◽  
1995 ◽  
Vol 7 (2) ◽  
pp. 285-304 ◽  
Author(s):  
Maria Sidiropoulou
Keyword(s):  
The Other ◽  
Social Constraints ◽  
Greek Version ◽  
Quality Of Information ◽  
Rule Application ◽  
The Difference ◽  
The One

Abstract A hundred translated article headlines appearing in the Greek press are contrasted to their originals in the English press. The cognitive, cultural and social constraints on headline formation observed relate to a higher degree of directness associated with the Greek version of the corpus, on the one hand, and differences with respect to 'thematic ' preferences, on the other. The quantity and quality of information to be included in the schematic category Headline, in Greek, differs: the quantity of information relates to the genre the article belongs to and the difference in quality is a result of a different 'macro-rule' application.

scholarly journals Customer satisfaction of less than container load cargo service of Logistics companies in HoChiMinh city

2020 ◽  
Author(s):  
Ha Nam Khanh Giao ◽  
Nguyen Thi Anh Thy ◽  
Bui Nhat Vuong ◽  
Tran Ngoc Tu ◽  
Pham Quang Vinh ◽  
...  
Keyword(s):  
Factor Analysis ◽  
Customer Satisfaction ◽  
Sampling Method ◽  
Service Process ◽  
Alpha Coefficient ◽  
Management Implications ◽  
Price Management ◽  
The Difference ◽  
Different Characteristics

This research has four specific objectives: (1) Identifying factors that affect customer satisfaction of less than container load (LCL) cargo service of logistics companies in HoChiMinh city (HCMC), (2) Measuring the level of impact of the factors, (3) Testing the difference in satisfaction among groups of customers with different characteristics in terms of type of business and time of using LCL cargo service, and (4) Proposing some management implications to improve the quality of LCL cargo services, by interviewing 210 customers who enjoyed the LCL cargo service in HCMC for at least the last 6 months, using the convenient sampling method. SPSS 20 was used to analyze the reliability of the scale through the Cronbach's alpha coefficient, Exploratory factor analysis, Multiple linear regression analysisThe result identified the 06 factors that influence positively on customer satisfaction of LCL cargo service of logistics companies in HCMC, by decreasing the importance: Service process, Image, Resource, Price, Management, Outcomes. The results show that there is no difference in customer satisfaction of LCL cargo service by types of business as well as time of using service. The research suggests some management implications to the management of logistics companies in HCMC to enhance the customer satisfaction.

scholarly journals De la calidad de la vida laboral a los riesgos Psicosociales: evaluación de la calidad de vida laboral

2011 ◽  
pp. 5 ◽  
Author(s):  
Marino Martínez Gamarra ◽  
Ricardo Ros Mar
Keyword(s):  
Theoretical Model ◽  
Working Life ◽  
Quality Of Working Life ◽  
Psychosocial Risks ◽  
Calidad De Vida ◽  
Evaluative Process ◽  
The Difference ◽  
The One ◽  
A Company

Mediante este artículo pretendemos mostrar la importancia de comenzar la evaluación de riesgos psicosociales, tal como obliga la Ley de Prevención de Riesgos Laborales, mediante la evaluación de la Calidad de vida laboral, que es la que debe tomarse como referencia en el proceso evaluativo de los problemas de carácter psicosocial y organizativo de una empresa. Definimos el concepto de Calidad de vida laboral, diferenciándolo del término Satisfacción laboral y matizando la diferencia con el concepto de Cultura organizativa. Asimismo, se presenta un modelo teórico y un cuestionario para la evaluación de la calidad de vida laboral, con las variables principales de análisis y las dimensiones de cada una de ellas.With this communication we try to show the importance of beginning the evaluation of psychosocial risks, as it forces the law of prevention of Labour Risks, by means of the evaluation of the quality of working life, that is the one that must be taken like reference in the evaluative process of the problems of psychosocial and organizational character from a company. We define the concept of quality of working life differentiating it from the term Job Satisfaction and clarifying the difference with the concept of Organizational Culture. Also, one appears a theoretical model and a questionnaire for the evaluation of the quality of working life, with the main variables of analysis and the dimensions of each of them.

scholarly journals Quality Evaluation of Remelted A356 Scraps

2016 ◽  
Vol 16 (3) ◽  
pp. 151-156 ◽  
Author(s):  
C. Yuksel ◽  
O. Tamer ◽  
E. Erzi ◽  
U. Aybarc ◽  
E. Cubuklusu ◽  
...  
Keyword(s):  
Cost Reduction ◽  
Quality Evaluation ◽  
Die Casting ◽  
Raw Material ◽  
Reduced Pressure ◽  
Casting Quality ◽  
Aluminium Casting Alloy ◽  
Pressure Test ◽  
Machined Parts

AbstractA356 is one of the widely used aluminium casting alloy that has been used in both sand and die casting processes. Large amounts of scrap metal can be generated from the runner systems and feeders. In addition, chips are generated in the machined parts. The surface area with regard to weight of chips is so high that it makes these scraps difficult to melt. Although there are several techniques evolved to remedy this problem, yet the problem lies in the quality of the recycled raw material. Since recycling of these scrap is quite important due to the advantages like energy saving and cost reduction in the final product, in this work, the recycling efficiency and casting quality were investigated. Three types of charges were prepared for casting: %100 primary ingot, %100 scrap aluminium and fifty-fifty scrap aluminium and primary ingot mixture were used. Melt quality was determined by calculating bifilm index by using reduced pressure test. Tensile test samples were produced by casting both from sand and die moulds. Relationship between bifilm index and tensile strength were determined as an indication of correlation of melt quality. It was found that untreated chips decrease the casting quality significantly. Therefore, prior to charging the chips into the furnace for melting, a series of cleaning processes has to be used in order to achieve good quality products.

scholarly journals Vidas nas fronteiras do presente: da tentativa de controle curricular à diferença

2021 ◽  
Vol 14 (1) ◽  
pp. 367
Author(s):  
João Paulo Lopes dos Santos
Keyword(s):  
The Other ◽  
Quality Of Education ◽  
Proper Place ◽  
Philosophical Thought ◽  
Other Hand ◽  
The Difference ◽  
The One ◽  
And Control ◽  
Pensamiento Filosofico

Meu objetivo, neste texto, é o debate acerca das tensões que envolvem o currículo, tensões provocadas numa arena de disputas entre forças desiguais. Se por um lado, o currículo é instituído a partir de políticas que respondem às demandas conservadoras e neoliberais, cujas tentam silenciar a diferença e controlar vidas; por outro, ele é o próprio lugar da diferença com possibilidades reais de rupturas. Para orientar o debate, utilizo o seguinte questionamento: que afetações os currículos pensados sob a égide dos princípios neoliberais/conservadores incidem na circularidade da existência da diferença no acontecimento escolar? Nesse movimento de análise, opto por trabalhar com as perspectivas pós-fundacional e pós-estrutural como instrumento metodológico, sobretudo com a epistemologia do pensamento filosófico butleriano com a noção de enquadramento.  Apesar da tentativa de controle, os currículos pensados com base nas vozes conservadoras e neoliberais são passíveis de escapes. Assim, a desejada qualidade da educação, via conhecimento monocultural, dificilmente se concretizará. O que os currículos seguem fazendo, portanto, é tentar controlar o incontrolável, desejo do imaginário neoliberal de assegurar sua própria hegemonia.Palavras-chave: Controle curricular. Demandas conservadoras e neoliberais. Diferença.Lives at the borders of the present: from the attempt at curricular control to the difference ABSTRACT My goal in this text is the debate about the tensions surrounding the curriculum, tensions provoked in an arena of disputes between unequal forces. If, on the one hand, the curriculum is instituted based on policies that respond to conservative and neoliberal demands, whose attempts to silence the difference and control lives; on the other hand, it is the proper place of difference with real possibilities of ruptures. To guide the debate, I use the following question: what affects the curricula thought under the aegis of neoliberal/conservative principles affect the circularity of the existence of difference in the school event? In this movement of analysis, I choose to work with the post-foundational and post-structural perspectives as a methodological instrument, especially with the epistemology of butlerian philosophical thought with the notion of frameworking. Despite attempting at control, curricula thought based on conservative and neoliberal voices are subject to escape. Thus, the desired quality of education, via monocultural knowledge, is hardly to materialize. What the curricula continue to do, therefore, is to try to control the uncontrollable, desire of the neoliberal imagination to ensure its own hegemony.Keywords: Curricular control. Conservative and neoliberal demands. Difference.Vidas en las fronteras del presente: del intento de control curricular a la diferenciaRESUMENMi objetivo en este texto es debatir las tensiones que rodean el currículum, tensiones provocadas en una arena de disputas entre fuerzas desiguales. Si, por un lado, el currículum se instituye en base a políticas que responden a las demandas conservadoras y neoliberales, cuyas pretenden silenciar la diferencia y controlar vidas; por otro, él es el propio lugar de la diferencia con posibilidades reales de ruptura. Para guiar el debate, utilizo la siguiente pregunta: ¿qué afectaciones los currículos pensados curricular bajo la égida de principios neoliberales/conservadores que afectan la circularidad de la existencia de la diferencia en el evento escolar? En este movimiento de análisis, elijo trabajar con las perspectivas post-fundacional y post-estructural como herramienta metodológica, especialmente con la epistemología del pensamiento filosófico de Butler con la noción de encuadre. A pesar del intento de control, los currículos pensados en base a las voces conservadoras y neoliberales están sujetos a escape. Así, la calidad de educación deseada, a través del conocimiento monocultural, es poco probable que se materialice. Lo que los currículos siguen haciendo, por lo tanto, es intentar controlar el incontrolable, deseo imaginario neoliberal para asegurar su propia hegemonía.Palabras clave: Control curricular. Demandas conservadoras y neoliberales. Diferencia.

scholarly journals A New Methodology for Improving Service Quality Measurement: Delphi-FUCOM-SERVQUAL Model

Symmetry ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 757 ◽  
Author(s):  
Olegas Prentkovskis ◽  
Živko Erceg ◽  
Željko Stević ◽  
Ilija Tanackov ◽  
Marko Vasiljević ◽  
...  
Keyword(s):  
Service Quality ◽  
Quality Measurement ◽  
Second Phase ◽  
Quality Model ◽  
Chi Square ◽  
Third Phase ◽  
Quality Dimensions ◽  
The Difference ◽  
The One

The daily requirements and needs imposed on the executors of logistics services imply the need for a higher level of quality. In this, the proper execution of all sustainability processes and activities plays an important role. In this paper, a new methodology for improving the measurement of the quality of the service consisting of three phases has been developed. The first phase is the application of the Delphi method to determine the quality dimension ranking. After that, in the second phase, using the FUCOM (full consistency method), we determined the weight coefficients of the quality dimensions. The third phase represents determining the level of quality using the SERVQUAL (service quality) model, or the difference between the established gaps. The new methodology considers the assessment of the quality dimensions of a large number of participants (customers), on the one hand, and experts’ assessments on the other hand. The methodology was verified through the research carried out in an express post company. After processing and analyzing the collected data, the Cronbach alpha coefficient for each dimension of the SERVQUAL model for determining the reliability of the response was calculated. To determine the validity of the results and the developed methodology, an extensive statistical analysis (ANOVA, Duncan, Signum, and chi square tests) was carried out. The integration of certain methods and models into the new methodology has demonstrated greater objectivity and more precise results in determining the level of quality of sustainability processes and activities.

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