Fatigue behavior of precipitation strengthened Cu–Ni–Si alloy modified by Cr and Zr addition

2020 ◽  
Vol 11 (6) ◽  
pp. 861-873
Author(s):  
Ş. Hakan Atapek ◽  
Spiros Pantelakis ◽  
Şeyda Polat ◽  
Apostolos Chamos ◽  
Gülşah Aktaş Çelik
Keyword(s):  
Design Methodology ◽  
Fatigue Behavior ◽  
Fatigue Tests ◽  
Lower Stress ◽  
Content Type ◽  
Hardened Alloy ◽  
Zr Addition ◽  
Nucleation Sites ◽  
The Matrix ◽  
Lower Stress Level

Purpose The purpose of this paper is to investigate the fatigue behavior of precipitation-strengthened Cu‒2.55Ni‒0.55Si alloy, modified by the addition of 0.25 Cr and 0.25 Zr (wt%), using mechanical and fractographical studies to reveal the effect of microstructural features on the fracture. Design/methodology/approach For strengthening, cast and hot forged alloy was subjected to solution annealing at 900°C for 60 min, followed by quenching in water and then aging at 490°C for 180 min. Precipitation-hardened alloy was exposed to fatigue tests at R=−1 and different stress levels. All fracture surfaces were examined within the frame of fractographical analysis. Findings Fine Ni-rich silicides responsible for the precipitation strengthening were observed within the matrix and their interactions with the dislocations at lower stress level resulted in localized shearing and fine striations. Although, by the addition of Cr and Zr, the matrix consisted of hard Ni, Zr-rich and Cr-rich silicides, these precipitates adversely affected the fatigue behavior acting as nucleation sites for cracks. Originality/value These findings contribute to the present knowledge by revealing the effect of microstructural features on the mechanical behavior of precipitation-hardened Cu‒Ni‒Si alloy modified by Cr and Zr addition.

Service quality function deployment by the C-shaped QFD 3D matrix

2018 ◽  
Vol 25 (9) ◽  
pp. 3386-3405 ◽  
Author(s):  
Maryam Hassani ◽  
Arash Shahin ◽  
Manouchehr Kheradmandnia
Keyword(s):  
Quality Function Deployment ◽  
Design Methodology ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Customer Requirements ◽  
Content Type ◽  
Process Characteristics ◽  
The Matrix ◽  
3D Matrix ◽  
Simultaneous Comparison

Purpose The purpose of this paper is to examine the application of C-shaped QFD 3D Matrix in comparing process characteristics (PC), performance aspects (PA) and customer requirements, simultaneously and to prioritize the first two sets, respectively. Design/methodology/approach A three dimensional matrix has been developed with three sets of PC, PA and customers’ requirements and C-shaped matrix has been applied for simultaneous comparison of the dimensions and prioritization of the subsets of PC and PA. The proposed approach has been examined in a post bank. Findings Findings confirm the possibility of simultaneous comparison and prioritization of the three sets of dimensions of this study in post bank services. In addition, “growth and learning” and “bilateral relationship with suppliers” had the first priorities among PA and PC, respectively. Research limitations/implications While the proposed approach has many advantages, filling the matrixes is time-consuming. Since illustrating the 3D matrix was not possible, the matrix was separated into five two-dimensional matrixes. Originality/value Compared to the studied literature, the proposed approach is practically new in the post bank services.

The prevalence and content of police discipline matrices

2015 ◽  
Vol 38 (4) ◽  
pp. 788-804 ◽  
Author(s):  
Christopher J. Harris ◽  
Kristen Chierus ◽  
Timothy C. Edson
Keyword(s):  
Police Officers ◽  
Design Methodology ◽  
Online Survey ◽  
Research Literature ◽  
Police Departments ◽  
Two Phase ◽  
Content Type ◽  
National Surveys ◽  
The Matrix ◽  
Practical Implications

Purpose – The purpose of this paper is to determine the prevalence of the use of discipline matrices across large US police departments, as well as to compare the structure and content of such matrices. Design/methodology/approach – The study employs a two phase approach. Phase I consisted of a brief online survey of a stratified, random sample of police departments with 100 or more sworn police officers and asked about whether or not the agency employed a discipline matrix. Phase II consisted of requesting a copy of the matrix and corresponding materials from all agencies who indicated they employed a matrix, and analyzing the content of those matrices. Findings – In total, 37 percent of responding agencies said they are using or are planning a discipline matrix, and the authors obtained a matrix from 32 police departments. The structure of the matrices and recommended discipline varied widely across these departments, indicating a lack of consensus on the development of this relatively new accountability tool. Research limitations/implications – The survey focussed on large police departments and the response rate was somewhat lower than other past national surveys. Practical implications – Discipline matrices are employed to a greater extent than is implied by the current research literature. The lack of consensus and variability in policies around matrices indicates a need for more research which could contribute toward the formation of a model policy in this regard. Originality/value – To date the prevalence of discipline matrices across US police departments was unknown, and very little was known about how they were structured or what comprised their content.

What am I seen – who do I seem? Hidden discursive processes in the large group of a TC

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Zsolt Zalka
Keyword(s):  
Design Methodology ◽  
Community Level ◽  
Analysis Method ◽  
Structured Interviews ◽  
Content Type ◽  
Large Group ◽  
Content Analysis Method ◽  
The Matrix ◽  
Linguistic Methods ◽  
Practical Implications

Purpose The purpose of the paper is to present a possible way of discourse analysis of the meaning giving processes in a therapeutic community (TC). Design/methodology/approach Presentation of a research project, which aim is to analyse the attitudes towards the large group within the TC, is based on analysing the conceptual metaphors in semi-structured interviews. Findings The findings delineate a possible discourse, namely, the TC’s hidden discourse of working through the mirror-transference at the community level. Practical implications The paper proposes a possible content analysis method for better understanding the deep processes of the TC by examining the large group. Social implications The paper emphasizes the matrix of a TC as a mentalizing scene. Originality/value The use of linguistic methods in understanding the hidden community level mentalizing processes.

Enriching the library subject headings with folksonomy

2020 ◽  
Vol 38 (2) ◽  
pp. 297-315
Author(s):  
Wei Yu ◽  
Junpeng Chen
Keyword(s):  
Design Methodology ◽  
State Of The Art ◽  
Semantic Space ◽  
Semantic Relation ◽  
Data Set ◽  
Content Type ◽  
Weighted Matrix ◽  
Subject Headings ◽  
Effective Performance ◽  
The Matrix

Purpose The purpose of this paper is to explore the potential of enriching the library subject headings with folksonomy for enhancing the visibility and usability of the library subject headings. Design/methodology/approach The WorldCat-million data set and SocialBM0311 are preprocessing and over 210,000 library catalog records and 124,482 non-repeating tags were adopted to construct the matrix to observe the semantic relation between library subject headings and folksonomy. The proposed system is compared with the state-of-the-art methods and the parameters are fixed to obtain effective performance. Findings The results demonstrate that by integrating different semantic relations from library subject headings and folksonomy, the system’s performance can be improved compared to the benchmark methods. The evaluation results also show that the folksonomy can enrich library subject headings through the semantic relationship. Originality/value The proposed method simultaneous weighted matrix factorization can integrate the semantic relation from the library subject headings and folksonomy into one semantic space. The observation of the semantic relation between library subject headings and social tags from folksonomy can help enriching the library subject headings and improving the visibility of the library subject headings.

Tribological problems in shaft hoist ropes wear process

2015 ◽  
Vol 67 (1) ◽  
pp. 47-51 ◽  
Author(s):  
Michal Styp-Rekowski ◽  
Eugeniusz Manka ◽  
Maciej Matuszewski ◽  
Monika Madej ◽  
Dariusz Ozimina
Keyword(s):  
Design Methodology ◽  
Fatigue Tests ◽  
Significant Excess ◽  
Fatigue Wear ◽  
Content Type ◽  
Wear Process ◽  
Current State ◽  
Strength Tests ◽  
Qualitative Index ◽  
Practical Implications

Purpose – The purpose of this paper was to create conditions for the correct decision concerning an exchange of the used rope for a new one. A cognitive goal was to indicate the causes of its wear and determining its mechanism reliability and durability. Design/methodology/approach – The magnetic, organoleptic and strength standard tests of lifting triangle-strand ropes of a mining hoist were carried out. This way the current state of the tested rope was defined. Findings – On the basis of an analysis of the results of the performed tests: magnetic, organoleptic and fatigue tests, it can be said that the magnetic one is accurate enough only to indicate the place of the rope’s biggest weakening, though the degree of weakening is not defined precisely – with significant excess. The accurate rope’s destruction degree is indicated by the strength tests. Practical implications – The results of described investigations can improve safety of the mining rope mechanisms operation, even for an increased resource. Originality/value – The elementary wear processes, which are the basic reason for the destruction of the rope, are indicated. Rope destruction is caused mainly by tribological factors: abrasion, corrosion and fatigue wear. Magnetic tests are accurate enough only to indicate the place of the rope’s biggest weakening (qualitative index). Most precisely, the rope’s destruction degree (quantitative index) can be found by the strength tests.

scholarly journals It takes two to tango

2018 ◽  
Vol 38 (6) ◽  
pp. 1312-1339 ◽  
Author(s):  
Karlos Artto ◽  
Virpi Turkulainen
Keyword(s):  
Design Methodology ◽  
Component Level ◽  
Content Type ◽  
Organizational Network ◽  
Unique Product ◽  
Project Outcome ◽  
The Matrix ◽  
The Empirical Analysis ◽  
Future Project ◽  
Project Level

Purpose The purpose of this paper is to develop further understanding of the interdependence between product and organization subsystems in the context of major projects by empirically elaborating the volume-variety matrix. Design/methodology/approach Projects are perceived as systems that include a product subsystem (the project outcome) and an organization subsystem (the temporary multi-firm organizational network that produces the project outcome). This study addresses product-organization interdependence by analyzing product and organization subsystem components in terms of their uniqueness and reuse across multiple projects. The empirical analysis focuses on four global renewable fuels refinery projects implemented by Neste from 2003 to 2011. The refineries are based on the same proprietary technology but are unique at the project level. Findings The findings indicate interesting interdependencies between product and organization subsystems when analyzed at the component level: the findings suggest both diagonal and off-diagonal positions in the volume-variety matrix. An example of an off-diagonal position is a reused organization subsystem component associated with a unique product subsystem component, meaning that choosing the same organization in a future project can be used for acquiring an improved and, thereby, unique product subsystem component. Originality/value The study elaborates upon the volume-variety matrix in the context of major projects. The findings related to off-diagonal positions in the matrix provide new knowledge on combinations at the component level where a reused organization can be associated with a unique product, and vice versa. This has direct implications for management of projects.

Capturing and analyzing e-WOM for travel products: a method based on sentiment analysis and stochastic dominance

Kybernetes ◽  
2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Yong-Hai Li ◽  
Jin Zheng ◽  
Shan-Tao Yue ◽  
Zhi-Ping Fan
Keyword(s):  
Sentiment Analysis ◽  
Stochastic Dominance ◽  
Design Methodology ◽  
Word Of Mouth ◽  
Service Providers ◽  
Research Problem ◽  
Online Review ◽  
Purchase Decisions ◽  
Content Type ◽  
The Matrix

PurposeIn recent years, electronic word-of-mouth (e-WOM) concerning travel products reflected in online review information has become an important reference for tourists to make their product purchase decisions, while for travel service providers (TSPs), monitoring and improving the e-WOM of their travel products is always an important task. Therefore, based on the online review information, how to capture e-WOM of travel products and find out specific ways to improve the e-WOM is a noteworthy research problem. The purpose of this paper is to develop a method for capturing and analyzing e-WOM toward travel products based on sentiment analysis and stochastic dominance.Design/methodology/approachSpecifically, online review information of travel products is first crawled and preprocessed. Second, sentiment strengths of online review information toward travel products concerning each feature are judged. Then, the matrix of structured online review information toward travel products is formed. Further, the matrix of e-WOM comparisons between any two travel products is constructed, and e-WOM ranking concerning each travel product is determined. Finally, trade-off chart models are constructed to conduct the e-WOM improvement analyses concerning the travel products.FindingsAn empirical study based on the online review information toward six travel products crawled from the Tuniu.com website is given to illustrate the use of the proposed method.Originality/valueThe proposed method can not only realize the real-time e-WOM monitoring to travel products but also be useful for TSPs to improve the e-WOM of their travel products.

Development of a mini-tribometer for in-situ observation of subsurface and the corresponding experiments

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Chen Li ◽  
Heng Wen ◽  
Kun Chen ◽  
Longxiao Zhang ◽  
Ting Xie ◽  
...  
Keyword(s):  
Wear Mechanism ◽  
Design Methodology ◽  
Material Design ◽  
In Situ Observation ◽  
Content Type ◽  
The Matrix ◽  
Frictional Interface ◽  
Dynamic Wear ◽  
Peeling Off

Purpose This paper aims to develop a Mini-Tribometer for in-situ observation of subsurface. Design/methodology/approach To observe the change of the microstructure during wear in real time, an in-situ observation mini-tribometer was developed according to the requirements of the basic frictional experiments and carried out the verification experiments. Findings The subsurface images and the tribological data obtained from the mini-tribometer clearly show that the graphite in the matrix moves to the surface and takes part in lubrication mainly in the form of extrusion and peeling off, and the migration of graphite in the copper-based composite to the frictional interface to act as lubricant and to result in the decrease of the friction coefficient. The experimental results of the developed tribometer are accurate, which can provide important references for further research on the wear mechanism of materials. Originality/value The developed in-situ observation mini-tribometer can be used to observe the dynamic wear mechanism of the frictional pairs, which is very important for optimization of material design and tribological performances.

Solving the coupled Sylvester-like matrix equations via a new finite iterative algorithm

2017 ◽  
Vol 34 (5) ◽  
pp. 1446-1467 ◽  
Author(s):  
Masoud Hajarian
Keyword(s):  
Finite Number ◽  
Iterative Algorithm ◽  
Design Methodology ◽  
Matrix Form ◽  
Matrix Equations ◽  
Content Type ◽  
Numerical Examples ◽  
The Matrix ◽  
Number Of Iterations ◽  
Finite Number Of Iterations

Purpose The purpose of this paper is to obtain an iterative algorithm to find the solution of the coupled Sylvester-like matrix equations. Design/methodology/approach In this work, the matrix form of the conjugate direction (CD) algorithm to find the solution X of the coupled Sylvester-like matrix equations: {A1XB1+M1f1(X)N1=F1,A2XB2+M2f2(X)N2=F2,with fi(X) = X, fi(X) = X¯, fi(X) = XT and fi(X) = XH for i = 1; 2 has been established. Findings It is proven that the algorithm converges to the solution within a finite number of iterations in the absence of round-off errors. Finally, four numerical examples were used to test the proficiency and convergence of the established algorithm. Originality/value The numerical examples have led the author to believe that the generalized CD (GCD) algorithm is efficient and it converges more rapidly in comparison with the CGNR and CGNE algorithms.

Persistence of bribery in West African countries

2020 ◽  
Vol 27 (2) ◽  
pp. 651-662
Author(s):  
Sani Abubakar Saddiq ◽  
Abu Sufian Abu Bakar
Keyword(s):  
Design Methodology ◽  
West African ◽  
Risk Matrix ◽  
Government Officials ◽  
African Countries ◽  
Data Set ◽  
Content Type ◽  
The Matrix ◽  
Policy Measures ◽  
Methods Of Moments

Purpose The purpose of this paper is to empirically test persistence of bribery transactions in West African countries in spite of combative policy measures put in place by various governments in the sub-continent. Design/methodology/approach Data for this paper is obtained from the data set of Trace International’s Bribery Risk Matrix covering 2016 to 2018. The matrix is used to allow firms to determine risks associated with contact with government officials in a particular country. The data set is used to test this paper’s hypotheses. The generalize methods of moments (GMM) was used to estimate panel data of 16 West African Countries in STATA 14.0. Findings The result of the estimations reveals that in spite of combative policy measures put in place and millions of dollars spent, bribery is on the increase in West African countries. Originality/value Prior studies tend to focus on prevalence and pervasiveness of bribery transactions across the globe. This paper is one of the few that focuses on persistence of bribery particularly in West African countries.

Sign in / Sign up

Export Citation Format

Share Document