The Materials Balance-Scientific Fundamentals for the Quality Assurance of Vitrified Waste

1981 ◽  
Vol 11 ◽  
Author(s):  
Edwin Schiewer ◽  
Harald Rabe ◽  
Siegfried Weisenburger
Keyword(s):  
Quality Assurance ◽  
Quantitative Analysis ◽  
Chemical Processes ◽  
Glass Product ◽  
Short Term ◽  
Materials Balance ◽  
Glass Output ◽  
The Stability ◽  
Composition Process

In the vitrification of HLW the aim is to create a product, the stability (thermal, mechanical) of which is, to the greatest possible degree, independent of fluctuations in its composition. Process control during vitrification of HLLW is necessary in order to assure the quality of the final glass product. The chemical processes are controlled by quantitative analysis of all material streams entering and leaving the melting device. There are six material streams to consider: frit input, waste input, corrosion products (generated by the vitrification process), off-gas, recycled off-gas, glass output. Additionally, the capacity of the glass for buffering short-term fluctuations in the incoming streams must be known. Sufficient sampling during non-radioactive vitrification in addition to materials tests can provide the necessary data basis. The results are combined in a materials balance.

scholarly journals Quality assurance on the example of the welding process for gear lever

2018 ◽  
Vol 19 (9) ◽  
pp. 219-224
Author(s):  
Stanisław Pałubicki
Keyword(s):  
Quality Assurance ◽  
Continuous Improvement ◽  
Automotive Industry ◽  
Welding Process ◽  
Product Selection ◽  
Production Processes ◽  
The Stability ◽  
Gear Lever ◽  
Manufacturing Stage

Quality is one of the basics of product selection by customers. Therefore, the main area of quality management is the identification of customers, their requirements and expectations. This is especially important in the automotive industry. Today's enterprises, wanting to strengthen their market position by improving the quality of their products, constantly control their products. Systems responsible for monitoring production allow to ensure the course of production processes in supervised conditions. The monitoring and recording of events that occur during production is of key importance. This is the basis for analyzing the stability of the production process, which is a key aspect of continuous improvement of quality. Thanks to this approach, it is possible to prevent the generation of costs related to the removal of defective products created at the manufacturing stage, as well as to reduce the number of complaints.

scholarly journals Quality assurance and control system for railway track tamping

2018 ◽  
Vol 216 ◽  
pp. 03004 ◽  
Author(s):  
Andrey Ilinykh ◽  
Alexey Manakov ◽  
Andrey Abramov ◽  
Sergey Kolarzh
Keyword(s):  
Quality Assurance ◽  
Quality Criteria ◽  
Railway Track ◽  
Rolling Stock ◽  
Theoretical Studies ◽  
The Stability ◽  
And Control ◽  
Control Methodology ◽  
Quality Assurance And Control

Ensuring stable parameters of a railway track after bringing it into a design position is a key measure of quality for evaluating completed repairs. Identifying quality criteria for sleeper tamping using a special rolling stock is a high-priority problem for a railway track infrastructure. This problem is complicated by a large choice of ballast compaction, leveling and finishing machines, totaling more than 30 types. The paper presents results of theoretical studies aimed at assuring and controlling the quality of tamping by multi-purpose track machines. The factors that determine the stability of railway track parameters in operation were identified. The track repair processes were analyzed. The operating factors that are essential for developing qualitative process parameters were identified for various types of track machines. Based on the findings of these studies, a quality assurance and control methodology was developed for railway track repair and maintenance operations.

Cathartic Effect of Suicide Attempts Not Limited to Depression

Crisis ◽  
2003 ◽  
Vol 24 (2) ◽  
pp. 73-78 ◽  
Author(s):  
Yves Sarfati ◽  
Blandine Bouchaud ◽  
Marie-Christine Hardy-Baylé
Keyword(s):  
Quality Of Life ◽  
Depressive Symptoms ◽  
Personality Traits ◽  
Rating Scales ◽  
Suicide Attempts ◽  
World Health ◽  
Life Questionnaire ◽  
Short Term

Summary: The cathartic effect of suicide is traditionally defined as the existence of a rapid, significant, and spontaneous decrease in the depressive symptoms of suicide attempters after the act. This study was designed to investigate short-term variations, following a suicide attempt by self-poisoning, of a number of other variables identified as suicidal risk factors: hopelessness, impulsivity, personality traits, and quality of life. Patients hospitalized less than 24 hours after a deliberate (moderate) overdose were presented with the Montgomery-Asberg Depression and Impulsivity Rating Scales, Hopelessness scale, MMPI and World Health Organization's Quality of Life questionnaire (abbreviated versions). They were also asked to complete the same scales and questionnaires 8 days after discharge. The study involved 39 patients, the average interval between initial and follow-up assessment being 13.5 days. All the scores improved significantly, with the exception of quality of life and three out of the eight personality traits. This finding emphasizes the fact that improvement is not limited to depressive symptoms and enables us to identify the relative importance of each studied variable as a risk factor for attempted suicide. The limitations of the study are discussed as well as in particular the nongeneralizability of the sample and setting.

Criteria for evaluation of the coordinate measurements quality of parts geometric parameters at pilot-experimental production

2019 ◽  
pp. 3-8
Author(s):  
N.Yu. Bobrovskaya ◽  
M.F. Danilov
Keyword(s):  
Quality Indicators ◽  
Quality Management System ◽  
Technical Specification ◽  
Experimental Production ◽  
Technological Heredity ◽  
Coordinate Measurements ◽  
Reasonable Choice ◽  
The Stability ◽  
Geometric Elements

The criteria of the coordinate measurements quality at pilot-experimental production based on contemporary methods of quality management system and traditional methods of the measurements quality in Metrology are considered. As an additional criterion for quality of measurements, their duration is proposed. Analyzing the problem of assessing the quality of measurements, the authors pay particular attention to the role of technological heredity in the analysis of the sources of uncertainty of coordinate measurements, including not only the process of manufacturing the part, but all stages of the development of design and technological documentation. Along with such criteria as the degree of confidence in the results of measurements; the accuracy, convergence, reproducibility and speed of the results must take into account the correctness of technical specification, and such characteristics of the shape of the geometric elements to be controlled, such as flatness, roundness, cylindrical. It is noted that one of the main methods to reduce the uncertainty of coordinate measurements is to reduce the uncertainty in the initial data and measurement conditions, as well as to increase the stability of the tasks due to the reasonable choice of the basic geometric elements (measuring bases) of the part. A prerequisite for obtaining reliable quality indicators is a quantitative assessment of the conditions and organization of the measurement process. To plan and normalize the time of measurements, the authors propose to use analytical formulas, on the basis of which it is possible to perform quantitative analysis and optimization of quality indicators, including the speed of measurements.

On Being Precarious

2020 ◽  
Vol 50 (1) ◽  
pp. 51-54
Author(s):  
Deirdre Flynn
Keyword(s):  
Quality Of Life ◽  
Short Term ◽  
Teaching Research ◽  
Part Time

In this essay, I reflect on my experience of part-time, fixed term, zero-hour, short-term, and unpaid contracts in academia. Precarious contracts are one of the biggest challenges facing our industry as neo-liberal values rule our institutions, impacting our teaching, research, and quality of life.

Electrical Damage Due to Low Energy Plasma Processing of GaAs Structures

1991 ◽  
Vol 223 ◽  
Author(s):  
Hans P. Zappe ◽  
Gudrun Kaufel
Keyword(s):  
Chemical Processes ◽  
Low Energy ◽  
Electrical Behavior ◽  
Rapid Thermal Anneal ◽  
High Temperature Anneal ◽  
Significant Damage ◽  
Low Energies ◽  
Long Time ◽  
Physical Plasma

ABSTRACTThe effect of numerous plasma reative ion etch and physical milling processes on the electrical behavior of GaAs bulk substrates has been investigated by means of electric microwave absorption. It was seen that plasma treatments at quite low energies may significantly affect the electrical quality of the etched semiconductor. Predominantly physical plasma etchants (Ar) were seen to create significant damage at very low energies. Chemical processes (involving Cl or F), while somewhat less pernicious, also gave rise to electrical substrate damage, the effect greater for hydrogenic ambients. Whereas rapid thermal anneal treatments tend to worsen the electrical integrity, some substrates respond positively to long-time high temperature anneal steps.

CONCEPTUAL BASES OF ADAPTATION OF UKRAINE’S HIGHER EDUCATION TO THE STANDARDS OF EDUCATION QUALITY OF THE EUROPEAN AREA

2018 ◽  
Author(s):  
Nina Batechko
Keyword(s):  
Higher Education ◽  
Quality Assurance ◽  
European Higher Education Area ◽  
Quality Of Higher Education ◽  
European Area ◽  
European Higher Education ◽  
European Standards ◽  
Conceptual Foundations

The article outlines the conceptual framework for adapting Ukrainian higher education to the Standards and Recommendations for Quality Assurance in the European higher education area. The role of the Bologna Declaration in ensuring the quality of higher education in Europe has been explained. The conceptual foundations and the essence of standards and recommendations on quality assurance in the European higher education area have been defined. The Ukrainian realities of the adaptation of higher education of Ukraine to the educational European standards of quality have been characterized.

Statistical Management of Food Production Processes

2020 ◽  
pp. 30-35
Author(s):  
N.A. Jurk ◽  
Keyword(s):  
Production Process ◽  
Control Chart ◽  
Food Production ◽  
Time Interval ◽  
Bakery Products ◽  
Shewhart Control ◽  
Manufactured Products ◽  
Mnemonic Technique ◽  
The Stability

The article presents scientific research in the field of statistical controllability of the food production process using the example of bakery products for a certain time interval using statistical methods of quality management. During quality control of finished products, defects in bakery products were identified, while the initial data were recorded in the developed form of a checklist for registering defects. It has been established that the most common defect is packaging leakage. For the subsequent statistical assessment of the stability of the production process and further analysis of the causes of the identified defect, a Shewhart control chart (p-card by an alternative feature) was used, which allows you to control the quality of manufactured products by the number of defects detected. Analyzing the control chart, it was concluded that studied process is conditionally stable, and the emerging defects are random. At the last stage of the research, the Ishikawa causal diagram was used, developed using the 6M mnemonic technique, in order to identify the most significant causes that affect the occurrence of the considered defect in bakery products. A more detailed study will allow the enterprise to produce food products that meet the established requirements.

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