scholarly journals RELIABILITY OF QUALITY CONTROL OF BUILDING MATERIALS AND PRODUCTS

2021 ◽  
Vol 5 (12) ◽  
pp. 17-21
Author(s):  
V. Loganina
Keyword(s):  
Quality Control ◽  
Quality Assurance ◽  
Quality Indicators ◽  
Building Materials ◽  
Block Diagram ◽  
Concrete Blocks ◽  
Basement Walls ◽  
Tolerance Field ◽  
Six Sigma Methodology ◽  
Quality Of Products

The article deals with the issues of reliability of quality control of building materials and products. The structural diagram of the reliability of control of building materials is presented as a combination of series-connected technological operations. The purpose of the work is to assess the regulatory security of quality control of the production of building materials and products. The block diagram of quality control of concrete blocks for basement walls is presented. On the example of concrete blocks for basement walls, an assessment of the normative provision of product quality indicators is given. It has been established that the quality assurance of concrete blocks for FBS basement walls if all production parameters and quality indicators meet the requirements of regulatory documents and the condition: the mathematical expectation is in the middle of the product tolerance field and ± 3σ in the tolerance field is 0.9576, and the probability the appearance of marriage - 4.238%. The influence of the spread of indicators on the quality assurance is considered. It is found that with an increase in the value of the standard deviation to a value that is within the tolerance range of ± 2.5σ, the quality assurance decreases and amounts to 0,8092, and the probability of the appearance of defects is 19.08 %. It is shown that the application of the Six Sigma methodology at the enterprise will contribute to improving the quality of products

A nationwide evaluation of the prevalence of human papillomavirus in Brazil (POP-Brazil study): protocol of data quality assurance and control (Preprint)

2021 ◽  
Author(s):  
Jaqueline Driemeyer Correia Horvath ◽  
Marina Bessel ◽  
Natalia Luiza Kops ◽  
Flávia Moreno Alves Souza ◽  
Gerson Fernando Mendes Pereira ◽  
...  
Keyword(s):  
Quality Control ◽  
Quality Assurance ◽  
Quality Indicators ◽  
Sampling Errors ◽  
Online Data ◽  
Monitoring Visit ◽  
Multicenter Clinical Trials ◽  
Double Entry ◽  
And Control ◽  
Quality Assurance And Control

BACKGROUND The credibility of a study and its internal and external validity depend crucially on the quality of the data produced. Quality control aims to monitor sampling errors and measurements during the execution of a study and is based mainly on two pillars: planning and standardization of procedures. OBJECTIVE The present article aimed to describe the stages of quality control in the POP-Brazil study and to present an analysis of the quality indicators. METHODS Quality assurance and control included several phases and processes that were initiated with the planning of the study and continued through the development of the project; thus, all centers were trained in loco. RESULTS The data were through a structured questionnaire and collection of biological samples, both performed by more than 250 trained and certified health professionals. Furthermore, to correct possible inadequacies, all 119 centers (public health units) received at least one monitoring visit, which evaluated the professionals' performance and the process of completing the online data platform. The data were monitored daily and were audited through the double entry of data, performed by the central team. The reliability of data was analyzed through the test-retest method, comparing data from the online platform and a second application of the interview, and conducted through telephone, also by the central team. The agreement between the test and retest was considered good (kappa between 0.59 and 0.74). Large multicenter clinical trials are the basis of medical evidence-based and health-based prevention, so their design, logistics, and quality processes should always be carefully considered. CONCLUSIONS This article presents the processes and quality indicators in the POP-Brazil study that allow other studies to generate reliable data.

scholarly journals A Proposal for Six Sigma Integration for Large-Scale Production of Penicillin G and Subsequent Conversion to 6-APA

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Anirban Nandi ◽  
Sharadwata Pan ◽  
Ravichandra Potumarthi ◽  
Michael K. Danquah ◽  
Indira P. Sarethy
Keyword(s):  
Quality Control ◽  
Quality Assurance ◽  
Six Sigma ◽  
Mass Production ◽  
Large Scale ◽  
Penicillin G ◽  
Scale Production ◽  
Large Scale Production ◽  
Subsequent Conversion ◽  
Six Sigma Methodology

Six Sigma methodology has been successfully applied to daily operations by several leading global private firms including GE and Motorola, to leverage their net profits. Comparatively, limited studies have been conducted to find out whether this highly successful methodology can be applied to research and development (R&D). In the current study, we have reviewed and proposed a process for a probable integration of Six Sigma methodology to large-scale production of Penicillin G and its subsequent conversion to 6-aminopenicillanic acid (6-APA). It is anticipated that the important aspects of quality control and quality assurance will highly benefit from the integration of Six Sigma methodology in mass production of Penicillin G and/or its conversion to 6-APA.

Quality Control of Building Materials According to Uncertainty of Measurement and Stability of the Technological Process of Production

2020 ◽  
Vol 299 ◽  
pp. 1161-1165 ◽  
Author(s):  
Valentina I. Loganina ◽  
Yuri Petrovich Skachkov ◽  
Valery S. Lesovik
Keyword(s):  
Quality Control ◽  
Compressive Strength ◽  
Production Process ◽  
Building Materials ◽  
Standard Uncertainty ◽  
The State ◽  
Uncertainty Of Measurement ◽  
Average Value ◽  
Unstable Process ◽  
Tolerance Field

Information on the influence of the state of the production process of production and the uncertainty of the measurement on the decision on the product's suitability is given. It is shown on the example of brick production that the decision to accept a batch of bricks, taking into account the measurement uncertainty under unstable condition of the production process, may be erroneous. Three variants of the state of the production process for the production of 100-grade brick are considered. The first option - the average value of compressive strength does not coincide with the middle of the tolerance field, the production process is characterized as unstable, the second option - the average value of compressive strength does not coincide with the middle of the tolerance field, a greater value of the spread of the indicators compared with the first version and is characterized as an unstable process, the third option is the average value of the tensile strength, and compression coincides with the middle of the tolerance field, is characterized as a stable and reproducible process. It is established, that, if the production process is in a state of statistical controllability, i.e. stable, then taking into account the uncertainty of measurement, the brick grade remains 100. In an unstable process with an increase in the value of the standard uncertainty of type A, the controller's decision to identify the brand of brick 100 may be erroneous. Statistically stable and reproducible process makes it possible to increase the reliability of product quality control and to avoid mistakes in deciding on the rejection of products.

Quality assurance and quality control to ensure durability

2021 ◽  
Author(s):  
B. C. Roy ◽  
Tanmoy Guha ◽  
R. Ekambaram
Keyword(s):  
Quality Control ◽  
Quality Assurance ◽  
Service Life ◽  
Performance Standards ◽  
Full Compliance ◽  
Design Build ◽  
Adequate Quality ◽  
Structural Failures ◽  
High Level ◽  
Fundamental Requirement

<p>High level of quality during design, design-build and construction stages is a fundamental requirement to ensure that structure serves its intended purpose. Establishment of a quality assurance manual is prime necessity. Lack of quality control during design, review and approving design drawings are major reasons for structural failures. Designers and design checkers need to work in tandem to ensure more adequate Quality Assurance &amp; Control (QA/QC).</p><p>In structural design Durability is a key parameter and becomes critical for service life of 100/120 years. In design build and construction stages controlling work quality is important to maintain performance standards. Tailor made quality plan for Design-build Contract is essential. Quality procedures, inspection and testing needs implementation in practice to verify full compliance and prevent occurrence of faults and defects towards durability and service life. This paper deals with Quality with special emphasis on durability in design and construction through case studies of design build contracts.</p>

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