Recommendations for the minimum number of laboratory tests for intact rock

2020 ◽  
Vol 57 (8) ◽  
pp. 1153-1171
Author(s):  
Marie-Hélène Fillion ◽  
John Hadjigeorgiou
Keyword(s):  
South African ◽  
Laboratory Tests ◽  
Quantitative Methods ◽  
Intact Rock ◽  
Data Uncertainty ◽  
Geotechnical Data ◽  
Subjective Assessments ◽  
Geotechnical Database ◽  
Mining Project ◽  
Minimum Number

The design of mining excavations in rock requires access to a representative geotechnical model that includes the mechanical properties of the rock mass. The available geotechnical data provide the necessary input to analytical, numerical, and empirical design tools. Consequently, any geotechnical analysis is influenced by the quality of the input data. Therefore, to understand and mitigate the design risk caused by data uncertainty, it is critical to evaluate the level of confidence in the collected geotechnical data. A practical limitation of current mine design practice is the absence of quantitative guidelines to select the number of laboratory tests required. This investigation employs small-sampling theory to determine the minimum number of tests necessary to obtain predefined confidence intervals in intact rock estimates at South African mines. A key element of this work is the introduction of geotechnical domain complexity as a significant factor in establishing quantitative recommendations for the required minimum number of laboratory tests. A tangible contribution of this work is the development of an original methodology for planning laboratory testing campaigns for a new mining project or for updating the geotechnical database of operating mines. The proposed quantitative methods can eventually replace subjective assessments in addressing data collection requirements.

scholarly journals Application of Data Integrity Algorithm for Geotechnical Data Quality Management

2018 ◽  
Vol 12 (8) ◽  
pp. 85 ◽  
Author(s):  
Tarik Chafiq ◽  
Mohammed Ouadoud ◽  
Hassane Jarar Oulidi ◽  
Ahmed Fekri
Keyword(s):  
Quality Management ◽  
Data Quality ◽  
Processing Time ◽  
Research Work ◽  
Data Integrity ◽  
Data Quality Management ◽  
Sequential Approach ◽  
Geotechnical Data ◽  
Geotechnical Database ◽  
Manual Verification

The aim of this research work is to ensure the integrity and correction of the geotechnical database which contains anomalies. These anomalies occurred mainly in the phase of inputting and/or transferring of data. The algorithm created in the framework of this paper was tested on a dataset of 70 core drillings. In fact, it is based on a multi-criteria analysis qualifying the geotechnical data integrity using the sequential approach. The implementation of this algorithm has given a relevant set of values in terms of output; which will minimalize processing time and manual verification. The application of the methodology used in this paper could be useful to define the type of foundation adapted to the nature of the subsoil, and thus, foresee the adequate budget.

scholarly journals Acoustic nondestructive testing and measurement of tension for steel reinforcing members

2021 ◽  
Author(s):  
Michael McInerney ◽  
Matthew Brenner ◽  
Sean Morefield ◽  
Robert Weber ◽  
John Carlyle
Keyword(s):  
Laboratory Tests ◽  
Quantitative Methods ◽  
Longitudinal Velocity ◽  
Measurement Techniques ◽  
Field Tests ◽  
Shear Velocity ◽  
Structural Members ◽  
Unstressed State ◽  
Testing And Measurement ◽  
Theory And Model

Many concrete structures contain internal post-tensioned steel structural members that are subject to fracturing and corrosion. The major problem with conventional tension measurement techniques is that they use indirect and non-quantitative methods to determine whether there has been a loss of tension. This work developed an acoustics-based technology and method for making quantitative tension measurements of an embedded, tensioned steel member. The theory and model were verified in the laboratory using a variety of steel rods as test specimens. Field tests of the method were conducted at three Corps of Engineers dams. Measurements of the longitudinal and shear velocity were done on rods up to 50 ft long. Not all rods of this length were able to be measured and the quality and consistency of the signal varied. There were fewer problems measuring the longitudinal velocity than shear velocity. While the tension predictions worked in the laboratory tests, the tension could not be accurately calculated for any of the field sites because researchers could not obtain the longitudinal or shear velocities in an unstressed state, or precise measurements of the longitudinal and shear velocities due to the unknown precise length of the rods in the tensioned state.

scholarly journals Does integrated reporting enhance the value relevance of organizational capital? Evidence from the South African context

2019 ◽  
Vol 20 (5) ◽  
pp. 642-661 ◽  
Author(s):  
Maroua Tlili ◽  
Hakim Ben Othman ◽  
Khaled Hussainey
Keyword(s):  
South African ◽  
Financial Reporting ◽  
Quantitative Methods ◽  
Value Relevance ◽  
South African Context ◽  
Organizational Capital ◽  
The South ◽  
Integrated Reporting ◽  
Content Type ◽  
African Context

Purpose Despite the growing literature on integrated reporting (IR) adoption and the emphasis on integrated thinking capitals, prior research works only focused on the financial and non-financial reporting rather than the cornerstones of IR. In order to fill this gap, the purpose of this paper is to investigate the value relevance of organizational capital (OC) after the mandatory adoption of IR in South Africa over the period 2006–2015. Design/methodology/approach The authors have used quantitative methods to test the hypotheses. The South African context is unique since the Johannesburg Stock Exchange is the first to mandate listed firms to adopt IR following King III report in March 2010. Findings The findings provide the first evidence, to the best of the authors’ knowledge, on the positive and significant impact of IR adoption on the value relevance of OC. Originality/value The authors contribute to IR literature by providing new insight on the value relevance of one capital from a new perspective addressing the importance of resources as inputs to the business model highlighted by integrated thinking in the IR framework. The findings derive various implications for the International Integrated Reporting Council, managers, decision makers and the research community.

scholarly journals The use of statistical methods by MBA graduates in South African management and its implications for curriculum design

1994 ◽  
Vol 25 (2) ◽  
pp. 86-93
Author(s):  
Trevor Wegner ◽  
Stephanie Stray ◽  
Peter Naudé
Keyword(s):  
South African ◽  
Statistical Methods ◽  
Curriculum Design ◽  
Quantitative Methods ◽  
Teaching Strategy ◽  
Target Population ◽  
Methods Course ◽  
Course Planning ◽  
The United Kingdom ◽  
Similar Survey

With this study we aim to identify the degree of penetration of statistical methods in South African management. Consequently, that section of the management population with past exposure to quantitative methods is targetted. Thus the target population was all MBA alumni from South African Business Schools operating in South African companies. A response rate of 27% (408 usable responses) was achieved. The findings of this study correlate highly with those of a similar survey conducted in the United Kingdom in 1991. In addition to reporting these findings, we also sought to examine the implications of these results on future statistical methods course planning. We recommend a change in teaching strategy to promote greater utilization of this discipline in practice.

scholarly journals Integrated reporting and financial performance of South African listed banks

2019 ◽  
Vol 14 (2) ◽  
pp. 128-139 ◽  
Author(s):  
Reon Matemane ◽  
Rozane Wentzel
Keyword(s):  
Financial Performance ◽  
South African ◽  
Significant Relationship ◽  
Quantitative Methods ◽  
Value Added ◽  
Reporting Quality ◽  
Financial Statements ◽  
Least Square ◽  
Integrated Reporting ◽  
Reporting Practices

The recent development of integrated reporting intends to address the limitations associated with corporate reporting practices. This paper aims to examine whether a statistically significant relationship exists between integrated reporting quality and financial performance. Secondary data was used, namely the integrated reports and annual financial statements of South African banks listed on the Johannesburg Stock Exchange (JSE) for 2010–2014. For the period 2005–2009, only the financial statements were used, since integrated reporting was not yet mandatory. The research design was longitudinal and it combined qualitative and quantitative methods. Descriptive statistics and Feasible Generalized Least Square (FGLS) were used to explore the relationships between financial performance and integrated reporting quality. The results indicate that there is a positive relationship between integrated reporting quality (IRQ) and earnings per share (EPS). However, there is no significant relationship between IRQ and Tobin’s q (Q-Ratio), IRQ and return on equity (ROE), IRQ and return on assets (ROA) as well as IRQ and economic value added (EVA). Moreover, there are no significant differences on the financial performance of the listed banks before and after the introduction of integrated reporting.

scholarly journals RESEARCH OF RAILWAY AGGREGATE SUB-BALLAST MIXTURE PROPERTIES / GELEŽINKELIO POBALASTINIO SLUOKSNIO IŠ UŽPILDŲ MIŠINIO SAVYBIŲ TYRIMAS

2016 ◽  
Vol 7 (5) ◽  
pp. 540-545
Author(s):  
Deividas Navikas ◽  
Henrikas Sivilevičius
Keyword(s):  
Water Permeability ◽  
Load Distribution ◽  
Laboratory Tests ◽  
Road Construction ◽  
Coefficient Of Determination ◽  
Road Maintenance ◽  
Statistical Parameters ◽  
Minimum Number ◽  
The Relationship ◽  
Representative Samples

Railway sub-ballast layer is a connecting layer between the ballast and other track layers. This layer must ensure even load distribution into the subgrade, drainage surface water, prevent materials of layers mixing. Ensuring these properties allows to extend the explotation of all railway road construction and geometrical parameter of road maintenance. This article analyzes investigated railway sub-ballast mixture properties from large sample sizes (n = 49): gradation, water permeability and density statistical parameters. The regression equation showing the relationship between the fully percent passing through sieves averages and standard deviations is presented. Her coefficient of determination (R2 = 0.909). The minimum number of representative samples of these three properties research is determined. Irregularity in most cases of water permeability (ν = 88,3%), depending on the laboratory tests methodology errors, is indicated. Geležinkelio pobalastinis sluoksnis yra jungiamasis sluoksnis tarp balasto ir grunto sluoksnių. Šis sluoksnis turi užtikrinti tolygų apkrovos perdavimą į sankasą, nudrenuoti paviršinį vandenį, neleisti maišytis sluoksnių medžiagoms. Šių savybių užtikrinimas leidžia prailginti visos kelio konstrukcijos eksploataciją ir geometrinių kelio parametrų išlaikymą. Šiame straipsnyje yra analizuojamos užpildų mišinio, naudojamo geležinkelio pobalastiniame sluoksnyje, iš didelės imties (n = 49) gautos savybės: granuliometrinės sudėties, pralaidumo vandeniui ir tankio statistiniai parametrai. Pateikta granuliometrinės sudėties regresijos lygtis, rodanti sąsają tarp pilnutinių išbirų per sietus vidurkių ir standartinių nuokrypių. Jos determinacijos koeficientas R2 = 0.909. Apskaičiuoti reprezentatyvūs minimalūs bandinių skaičiai šioms trims savybėms tirti. Gauta, kad pralaidumo vandeniui savybė yra labiausiai nevienoda dėl laboratorinių tyrimų metodikos paklaidų, variacijos koeficientas (88,3 %).

scholarly journals Matching Subjective Assessments of Sod Strength to Quantitative Measurements of Peak Shear Force with Predominately Kentucky Bluegrass Sod

HortScience ◽  
2015 ◽  
Vol 50 (8) ◽  
pp. 1248-1251
Author(s):  
Karl Guillard ◽  
Richard J.M. Fitzpatrick ◽  
Holly Burdett
Keyword(s):  
Shear Strength ◽  
Rhode Island ◽  
Shear Force ◽  
Quantitative Methods ◽  
Poa Pratensis ◽  
Kentucky Bluegrass ◽  
Peak Force ◽  
Growing Seasons ◽  
Quantitative Measurements ◽  
Subjective Assessments

Adequate turfgrass sod strength for harvesting and handling is typically determined by the producer’s past experience and subjective appraisal. This study was conducted to determine the relationship between producer subjective sod-strength assessments and quantitative shear-strength measurements with predominantly kentucky bluegrass (Poa pratensis L.) turf. Across three consecutive growing seasons, 93 samples were collected from sod fields in Rhode Island and assessed for sod strength by subjective and quantitative methods. Producer subjective ratings of sod strength were significantly (P < 0.0001) associated with quantitative measurements of peak force required to shear a sod strip. Minimally acceptable strength occurred most frequently when peak shear force was between 55 and 85 kg·m−1 width of sod; whereas preferred sod strength occurred most frequently when peak shear force was between 70 and 140 kg·m−1 width of sod. Once peak force exceeded 58 and 86 kg·m−1, there was a > 50% probability that sod strength would be judged at least adequate and at preferred strength, respectively, up to a peak force of 140 kg·m−1. The results suggest that quantitative measurements of shear strength can be related to producer subjective assessments, and provide unbiased benchmark values to guide management decisions for kentucky bluegrass sod production.

scholarly journals A survey of quantitative methods in South African management

1983 ◽  
Vol 14 (3) ◽  
pp. 120-124 ◽  
Author(s):  
T. Wegner
Keyword(s):  
South African ◽  
Quantitative Methods ◽  
Decision Support Tool ◽  
Management Development ◽  
Development Programme ◽  
Management Decision ◽  
Support Tool ◽  
Frequency Of Use ◽  
Management Decision Making ◽  
The Subject

Academics who are responsible for training South Africa's future pool of management resources need, as part of their management development programme, to emphasize the contribution of Quantitative Methods to management decision making. To give a complete appreciation of Quantitative Methods, practice of the subject in South African management. No current research in this direction exists. This research, undertaken through a mailed questionnaire to South African companies, aimed to establish the relative use of Quantitative techniques; their frequency of use, and their degree of success as useful information generators. This paper summarizes the result and draws tentative conclusions about the state of art in 1982 of Quantitative Methods in South African management as a decision support tool.

scholarly journals CONCEPTUAL APPROACHES TO APPLICATION OF QUANTITATIVE AND QUALITATIVE METHODS OF ASSESSMENT OF ACCOUNTING AND AUDIT RISKS AMOUNT

2017 ◽  
pp. 139-144
Author(s):  
Roman Kulyk ◽  
Yuliya Novak
Keyword(s):  
Qualitative Methods ◽  
Quantitative Methods ◽  
Objective Probability ◽  
Accounting System ◽  
Audit Risk ◽  
Advantages And Disadvantages ◽  
Subjective Assessments ◽  
Relationship Of ◽  
The Relationship ◽  
Quantitative And Qualitative Methods

Introduction. The auditor, when assessing and calculating the level of components of audit risk, often encounters the factors or events. The objective probability of occurrence of these factors or events can not be determined on the basis of statistical observations. Purpose. The article aims to consider the problem of audit risk determination, to indicate the main causes of its occurrence. It is necessary to emphasize the relationship of audit risk and risk to the accounting system and the problems of not only minimizing them, but also transferring users to this information. Quantitative and qualitative methods for determining and assessing audit risk should be analysed. Their advantages and disadvantages must be indicated. Results. For maximum objectivity, it has been proposed to combine quantitative methods for assessing audit risk with qualitative ones on the basis of subjective assessments. A conceptual model for its assessment has been developed in order to carry out the effective audit risk management. His model is based on an optimal combination of quantitative and qualitative methods for evaluating factors that may directly or indirectly influence the size of the audit risk.

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