The Relationship between Strength and Abrasion Characterizations in Granite Building Stones

2021 ◽  
pp. qjegh2020-045
Author(s):  
A. Cheshomi ◽  
M. Moradizadeh
Keyword(s):  
Dimensionless Parameter ◽  
Empirical Relationship ◽  
Building Stones ◽  
Brazilian Tensile Strength ◽  
Strength Parameters ◽  
Empirical Relationships ◽  
Quartz Content ◽  
Simultaneous Impact ◽  
Rock Abrasion ◽  
The Relationship

The wear of cutting blades during the preparation of building stones is an inevitable issue that occurs due to the contact of the blade with rock components. The present study aims to investigate the feasibility of proposing experimental relations of strength parameters and mineralogical hardness with Cerchar and LCPC tests. For this purpose, 18 samples of granite building stones were selected and Equivalent Quartz Content (EQC), compressive and Brazilian tensile strength (UCS and BTS), Cerchar, and LCPC abrasivity indices (CAI and LAC) were determined. The results showed the lack of any significant relationship between strength and abrasion properties. However, when evaluating the simultaneous impact of EQC and UCS using the rock abrasion index (RAI=UCS×EQC), significant valid empirical relationships between RAI-CAI and RAI-LAC were derived. To investigate the simultaneous effect of UCS, BTS, and EQC, a dimensionless parameter, i.e. modified rock abrasion index (MRAI=(UCSBTS)×EQC) was introduced. Moreover, it was found that the empirical relationship between MRAI-CAI was more significant and valid than the previous relations. Verification of the proposed relationship with the values of other researchers and 6 new samples for estimating CAI and LAC based on UCS, BTS, and EQC was found to be highly accurate for granite building stones.

Understanding gas bubble trauma in an era of hydropower expansion: how do fish compensate at depth?

2020 ◽  
Vol 77 (3) ◽  
pp. 556-563 ◽  
Author(s):  
Naomi K. Pleizier ◽  
Charlotte Nelson ◽  
Steven J. Cooke ◽  
Colin J. Brauner
Keyword(s):  
Bubble Growth ◽  
Gas Bubble ◽  
Hydroelectric Dams ◽  
Dissolved Gas ◽  
Empirical Relationships ◽  
Lethal Effects ◽  
Exposed Fish ◽  
Total Dissolved Gas ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
The Relationship

Hydrostatic pressure is known to protect fish from damage by total dissolved gas (TDG) supersaturation, but empirical relationships are lacking. In this study we demonstrate the relationship between depth, TDG, and gas bubble trauma (GBT). Hydroelectric dams generate TDG supersaturation that causes bubble growth in the tissues of aquatic animals, resulting in sublethal and lethal effects. We exposed fish to 100%, 115%, 120%, and 130% TDG at 16 and 63 cm of depth and recorded time to 50% loss of equilibrium and sublethal symptoms. Our linear model of the log-transformed time to 50% LOE (R2 = 0.94) was improved by including depth. Based on our model, a depth of 47 cm compensated for the effects of 4.1% (±1.3% SE) TDG supersaturation. Our experiment reveals that once the surface threshold for GBT from TDG supersaturation is known, depth protects rainbow trout (Oncorhynchus mykiss) from GBT by 9.7% TDG supersaturation per metre depth. Our results can be used to estimate the impacts of TDG on fish downstream of dams and to develop improved guidelines for TDG.

scholarly journals Knowledge Management and Organizational Culture: An Exploratory Study

2013 ◽  
Vol 3 (1) ◽  
pp. 65-77 ◽  
Author(s):  
Bing Li ◽  
Jianpeng Zhang ◽  
Xiaoxia Zhang
Keyword(s):  
Organizational Culture ◽  
Knowledge Management ◽  
Management Practices ◽  
Empirical Relationship ◽  
Organizational Factors ◽  
Equation Modeling ◽  
Specific Situation ◽  
Knowledge Management Practices ◽  
Cultural Traits ◽  
The Relationship

Abstract Purpose of the article Knowledge has been considered as the strategic assets and become the source of competitive advantage in organizations. Knowledge management thus receives the extraordinary attention from the top management. Many organizational factors have influences on knowledge management practices. This paper attempts to explore the empirical relationship between knowledge management and organizational culture in the specific situation of China’s commercial banking industry. Methodology/methods The relationship between knowledge management and organizational culture is quantitatively investigated by surveying bank managers. The scale of SECI modes is used to measure knowledge management process and the scale of Denison Organizational Culture Survey (DOCS) is used to measure organizational culture. We explore the underlying relationship by employing the statistical analyses such as correlation, regression and structural equation modeling. Scientific aim The research aims at testing the relationship between knowledge management and organizational culture, and furthermore if there exist linkages between cultural traits and SECI modes. Findings The results of the empirical study confirm the great and positive effect that organizational culture has on knowledge management. Different cultural traits contribute to different SECI modes. Conclusions For obtaining successful knowledge management practices in organizations, it is better to concern about the relationship between knowledge management and organizational culture. The limitation in the paper is the sampling size, which will be solved by an industry-wide survey in our future research.

Towards a Theory of Suicide: The Case for Modern Fatalism

1981 ◽  
Vol 11 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Dennis L. Peck
Keyword(s):  
Content Analysis ◽  
Empirical Relationship ◽  
Social Condition ◽  
Case Histories ◽  
Specific Population ◽  
Suicide Notes ◽  
Theoretical Statement ◽  
The Relationship

This paper explores the empirical relationship between fatalism and suicide in a population of youthful victims. Content analysis of case histories and suicide notes was conducted for 132 individuals between the ages of twelve and thirty-four. Almost one-third (N = 43) of the youthful suicide victims were found to have experienced fatalistic thought-ways prior to their death. A model of fatalistic suicide based upon salient interdisciplinary observations consistent with a fatalistic explanation of youthful suicide is presented. Results are discussed relative to a specific population of victims in the light of a theoretical statement promulgating the relationship between a fatalistic social condition and youthful suicide.

A Dynamic Theory of Populism in Power

2021 ◽  
Author(s):  
Julio F. Carrión
Keyword(s):  
Regime Change ◽  
Dynamic Theory ◽  
Empirical Relationship ◽  
The United States ◽  
Democratic Governance ◽  
Theory Of Change ◽  
Popular Participation ◽  
The Andes ◽  
The Impact ◽  
The Relationship

The relationship between populism and democracy is a hotly debated topic. Some believe that populism is inherently bad for democracy because it is anti-pluralist and confrontational. Others argue that populism can reinvigorate worn-out democracies in need of an infusion of greater popular participation. This book advances this debate by examining the empirical relationship between populism in power and democracy. Does populism in power always lead to regime change, that is, the demise of democracy? The answer is no. The impact of populism on democracy depends on the variety of populism in power: the worst outcomes in democratic governance are found under unconstrained populism. This book discusses the conditions that explain how populism becomes unconstrained, and advances a dynamic theory of change that shows how the late victories of populists build on early ones, resulting in greater power asymmetries. The book analyzes five populist presidencies in the Andes. In four of them (Bolivia, Ecuador, Peru, and Venezuela), populism became unconstrained and regime change followed. In one case, Colombia, populism in power was contained and democracy survived. The concluding chapter places the Andean cases in comparative perspective and discusses how unconstrained populism in other cases (Nicaragua and Hungary) also lead to the end of electoral democracy. Where populism in power was constrained (Honduras and the United States), regime change did not materialize. This book advances a theory of populism that help us understand how democracies transition into non-democracies. To that extent, the book illuminates the processes of democratic erosion in our time.

A Study about Factors Influencing the University Performance

2013 ◽  
Vol 64 (2) ◽  
Author(s):  
Rosman Md. Yusoff ◽  
Faisal Khan ◽  
Asad Mubeen ◽  
Kamran Azam
Keyword(s):  
Regression Analysis ◽  
Empirical Relationship ◽  
Decision Makers ◽  
High Tech ◽  
Data Correlation ◽  
Correlation And Regression Analysis ◽  
Factors Influencing ◽  
University Performance ◽  
The University ◽  
The Relationship

The purpose of this study is to find out the empirical relationship and influence of Research Environment, Integration of the university with Industry, High-tech Employment and Professional & Managerial Development on the University Performance.A Questionnaire has been used to collect the data. Correlation and Regression analysis were used to determine the relationship and influence of identified dimensions over the University Performance.The findings of the study show that the identified dimensions significantly relate and influence the University Performance. This study would be helpful for the university administration while making policies to upgrade its performance. Less work has been done in Pakistan for the development of universities. This study distinctively identifies and represents the variables and their influence over the university performance. The findings increase the value of the study as it would help the decision makers at the universities to think ‘out of the box’.

scholarly journals AN INVESTIGATION ON THE EFFECTS OF MICRO-PARAMETERS ON THE STRENGTH PROPERTIES OF ROCK

2021 ◽  
Vol 36 (1) ◽  
pp. 111-119
Author(s):  
Behzad Jafari Mohammadabadi ◽  
Kourosh Shahriar ◽  
Hossein Jalalifar ◽  
Kaveh Ahangari
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Friction Coefficient ◽  
Critical Stress ◽  
Friction Angle ◽  
Strength Properties ◽  
Brazilian Tensile Strength ◽  
The Relationship

Rocks are formed from particles and the interaction between those particles controls the behaviour of a rock’s mechanical properties. Since it is very important to conduct extensive studies about the relationship between the micro-parameters and macro-parameters of rock, this paper investigates the effects of some micro-parameters on strength properties and the behaviour of cracks in rock. This is carried out by using numerical simulation of an extensive series of Uniaxial Compressive Strength (UCS) and Brazilian Tensile Strength (BTS) tests. The micro-parameters included the particles’ contact modulus, the contact stiff ness ratio, bond cohesion, bond tensile strength, the friction coefficient and the friction angle, and the mechanical properties of chromite rock have been considered as base values of the investigation. Based on the obtained results, it was found that the most important micro-parameters on the behaviour of rock in the compressive state are bond cohesion, bond tensile strength, and the friction coefficient. Also, the bond tensile strength showed the largest effect under tensile conditions. The micro-parameter of bond tensile strength increased the rock tensile strength (up to 5 times), minimized destructive cracks and increased the corresponding strain (almost 2.5 times) during critical stress.

On the use of structured time-series to detect and test hypotheses about within-lakes relationships

1995 ◽  
Vol 52 (4) ◽  
pp. 799-803 ◽  
Author(s):  
Yves T. Prairie ◽  
C. Tara Marshall
Keyword(s):  
Time Series ◽  
Empirical Data ◽  
Single System ◽  
Empirical Relationships ◽  
Cross Sectional ◽  
Apparent Relationship ◽  
Field Season ◽  
The Relationship ◽  
Over Time ◽  
Chlorophyll Concentrations

Aquatic scientists using empirical relationships developed from point measurements or averages from different lakes often assume that these relationships also apply to individual lakes over time. However, this assumption is difficult to test because the extent of variation within a single system is generally much smaller and the relationship accordingly less defined than across a number of systems. We present a new method to extract empirical relationships from the internal structure of a time-series within a single lake. When we applied the method to an extreme simulation, we were able to recover accurately the parameters of the relationship in spite of the absence of any apparent relationship between the variables. When applied to empirical data for phosphorus and chlorophyll concentrations collected daily over one field season, the estimated structural relationship was nearly identical to that estimated from cross-sectional data even though the empirical trend appeared much shallower and very weak.

Non-destructive Raman study on the provenance and firing temperature of Guan Wares in the Song Dynasty

2011 ◽  
Vol 1319 ◽  
Author(s):  
Lan Zhao ◽  
Jianmin Miao ◽  
Bairui Yang ◽  
He Li
Keyword(s):  
Firing Temperature ◽  
Song Dynasty ◽  
Empirical Relationship ◽  
Strongly Correlated ◽  
Southern Song ◽  
Kiln Site ◽  
Raman Study ◽  
The Relationship ◽  
Non Destructive ◽  
Beijing China

ABSTRACTNon-destructive Raman spectroscopy was applied to three kinds of porcelain glaze samples: (i) Guan wares of Song Dynasty; (ii) Imitated Guan wares; (Both (i) and (ii) are from the Palace Museum (Beijing, China) collections); (iii) Porcelain shards are collected from the Xiuneisi kiln site which is one of two excavated Guan ware imperial kilns in Hangzhou, the capital of the Southern Song Dynasty. Raman spectra of the glassy phase network were used to discuss the composition and firing temperature of the glaze. The index of polymerization (Ip) is strongly correlated with the firing temperature and the composition of the glaze. According to the Ip values of the glaze, those Guan wares (i) can be classified into three groups. The provenance of Guan wares (i) was discussed by comparing the Ip values to imitations (ii) and shards(iii). The study of classification and provenance are also supported by the X-ray fluorescence data. The Ip values of several recently prepared glazed samples of known firing temperature were measured to build empirical relationship between the Ip value and the firing temperature. Based on the relationship, the firing temperature of the Guan ware glazes was at 1170-1300°C.

Analysis of Mass Transfer Process in the Pore Free Technique

1995 ◽  
Vol 117 (2) ◽  
pp. 215-219 ◽  
Author(s):  
Genick Bar-Meir
Keyword(s):  
Mass Transfer ◽  
Dimensionless Parameter ◽  
Die Casting ◽  
Air Entrainment ◽  
Mass Transfer Process ◽  
Critical Value ◽  
First Case ◽  
Pressure Die Casting ◽  
The Relationship ◽  
Transfer Mechanisms

Air entrainment is one of the most significant problems in pressure die casting. A possible solution is to use the Pore Free technique. In this technique an oxygen is introduced into the die to react with the liquid metal. The vacuum created by the reaction reduces the porosity. The life span of the mold is augmented by the reduction of the pressure during the process. In some cases the Pore Free technique yields acceptable results, i.e., low porosity, while in other cases the results are not satisfactory. These differing results can be explained by an analysis of the mechanisms involved. A simple model is proposed based on conservation laws that describes the relationship between mass transfer mechanisms and pressure deviation. The model indicates that there is a critical dimensionless parameter above which the pressure is decreased and below which the pressure is increased. In the first case, when the parameter exceeds the critical value, the technique is useful. In the second case, when the parameter is less than the critical value, introducing oxygen does not greatly reduce the porosity. The analysis demonstrates that the Pore Free and vacuum venting techniques account for two different extremes. The first case is when the flow is orderly throughout the chamber in which vacuum venting can produce acceptable results. The second case is when the flow is turbulent and the Pore Free technique is the better choice.

Sub-components of the Rule of Law: Reassessing the Relevance of Diminished Subtypes

2013 ◽  
Vol 12 (3) ◽  
pp. 391-421
Author(s):  
Jørgen Møller ◽  
Svend-Erik Skaaning
Keyword(s):  
Rule Of Law ◽  
Empirical Relationship ◽  
Recent Attempt ◽  
The Rule Of Law ◽  
Fine Grained ◽  
Composite Measures ◽  
Composite Indices ◽  
Highly Correlated ◽  
The Relationship ◽  
Component Scores

Abstract The rule of law research agenda is in many ways still in its infancy. This is reflected, inter alia, in the fact that no attempt has been made to investigate the empirical relationship between sub-components of the rule law. In this article, we set out to make such an appraisal. We take our cue from a recent attempt to get at this relationship with a typology of ‘defective’ subtypes of the rule of law. Insofar as the underlying radial logic characterizes the relationship between constituent units of the rule of law, it would mean that countries tend to be situated in a range of so-called diminished subtypes, i.e., combinations defined by the presence of all attributes save one. The upshot of this is that we cannot simply aggregate the sub-component scores into composite indices. However, our analyses show that the scores on different rule of law attributes are highly correlated and that – if less fine-grained distinctions are used – cases tend to be characterized by either the presence of all attributes, by moderate scores on all attributes, or by severe shortcomings in every regard. These findings can be taken to support, first, that the value of constructing diminished subtypes of the rule of law is limited, and, second, that the creation of composite measures by aggregating across the rule of law subcomponents is not hampered by multidimensionality. At the end of the article, we use the extant literature on democratization and state formation to identify some potential reasons for the high co-variation between rule of law attributes.

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