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Article
Publication date: 21 March 2008

M.A. Quraishi, R. Sardar and S. Khan

This paper mainly aims to study the influence of some thiosemicarbazides, namely, 1‐hydroxyphenyl‐4‐phenyl thiosemicarbazide (HPT), 1,4‐diphenyl thiosemicarbazide (DPT)…

Abstract

Purpose

This paper mainly aims to study the influence of some thiosemicarbazides, namely, 1‐hydroxyphenyl‐4‐phenyl thiosemicarbazide (HPT), 1,4‐diphenyl thiosemicarbazide (DPT), 1‐aminophenyl‐4‐phenyl thiosemicarbazide (APT) and 1‐cinnamyl‐4‐phenyl thiosemicarbazide (CPT) on the corrosion inhibition of carbon steel in hydrochloric and sulphuric acid.

Design/methodology/approach

All inhibition experiments were conducted on carbon steel in 1N HCl and 1N H2SO4 solution. Weight loss experiments were carried out according to the ASTM standard procedure. Polarization studies were carried out in a three‐electrode cell assembly connected to an EG&G Princeton applied research potentiostat/galvanostat (model 173).

Findings

For all the compounds a consistent trend of increase in inhibition efficiency was observed as a function of inhibitor concentration. The adsorption of all the compounds on to the carbon steel surface in the acidic solution was found to obey the Tempkin's adsorption isotherm. The values of activation energy and free energy of adsorption for all the compounds were also calculated. Polarization measurement revealed that the studied thiosemicarbazides act predominantly as mixed inhibitors in both the acid solutions, with the exception of DPT, which predominantly behaved as a cathodic inhibitor in 1N HCl.

Research limitations/implications

These inhibitors could have application in industries, where hydrochloric and sulphuric acid solution are used to remove scale and salts from steel surfaces, such as acid cleaning of tankage and pipeline, and may render dismantling unnecessary.

Originality/value

This paper reveals that thiosemicarbazides can be successfully used for protection of carbon steel corrosion in acid solutions.

Details

Anti-Corrosion Methods and Materials, vol. 55 no. 2
Type: Research Article
ISSN: 0003-5599

Keywords

Book part
Publication date: 18 November 2019

Nana Yaa A. Gyamfi and Yih-teen Lee

Answering to calls for further contextualizing global leadership, this study investigates power dynamics and cultural identities in global leadership in an African…

Abstract

Answering to calls for further contextualizing global leadership, this study investigates power dynamics and cultural identities in global leadership in an African context. We took a grounded theory approach to investigate how a specific cultural context shapes assets and liabilities of global leaders. Drawing on our data comprising semi-structured interviews of managers of multinational enterprises operating in Ghana, we identified key assets and liabilities for being local or foreign in one’s global leadership role. Furthermore, we theorize four specific styles of leadership leveraging: identity leveraging, power leveraging, juxtapositional leveraging, and temporal leveraging. Finally, we integrated the above-mentioned elements and proposed a framework of contextualized assets and liabilities which illustrates how specific cultural context affects the assets and liabilities of localness and foreignness for global leaders, and how these assets and liabilities constitute the four styles of leveraging in such context. Implications of our findings for research and practice are discussed.

Book part
Publication date: 11 April 2017

Ngaire Bissett

This chapter addresses growing concerns that, despite being a radically intentioned community, Critical Management Studies (CMS) lacks an orientation to achieve pragmatic…

Abstract

This chapter addresses growing concerns that, despite being a radically intentioned community, Critical Management Studies (CMS) lacks an orientation to achieve pragmatic change. In response I argue that the failure to address the continuing marginalisation of the subaltern is key to CMS being negatively represented as an elitist self-preoccupied endeavour. This state of affairs is linked to a legacy of the ‘postmodern’ turn, which emerged in the 1980s and 1990s, as evidenced by the nature of contemporary debates continuing to reflect the stylistic fetishes of that time. I contend that the ghost of postmodernism is evident in the continuing predilection to produce signification discourses marked by symbolic absences, which politically confine such texts to the level of epistemology. The lack of integration of ontological concerns means that corporeal aspects of daily life are neglected, resulting in an abstracted ‘subjectless’ mode of representation. To address these limitations, a feminist activist version of post-structuralism (PSF) of the time is revisited, which through its distinctive attention to community concerns, enabled the linking of epistemological and ontological representations; thereby facilitating the creation of a framework for pragmatic change. As the chapter demonstrates, by drawing attention to the integral relationship between the modes of representation, power relations and subsequent social effects, poststructuralist feminists were able to achieve praxis outcomes. Accordingly, I argue this treasure house of ideas needs to be reclaimed and provides illustrations of the design principles proffered to support my contentions.

Details

Feminists and Queer Theorists Debate the Future of Critical Management Studies
Type: Book
ISBN: 978-1-78635-498-3

Keywords

Article
Publication date: 1 July 2021

Subhrapratim Nath, Jamuna Kanta Sing and Subir Kumar Sarkar

Advancement in optimization of VLSI circuits involves reduction in chip size from micrometer to nanometer level as well as fabrication of a billions of transistors in a…

Abstract

Purpose

Advancement in optimization of VLSI circuits involves reduction in chip size from micrometer to nanometer level as well as fabrication of a billions of transistors in a single die where global routing problem remains significant with a trade-off of power dissipation and interconnect delay. This paper aims to solve the increased complexity in VLSI chip by minimization of the wire length in VLSI circuits using a new approach based on nature-inspired meta-heuristic, invasive weed optimization (IWO). Further, this paper aims to achieve maximum circuit optimization using IWO hybridized with particle swarm optimization (PSO).

Design/methodology/approach

This paper projects the complexities of global routing process of VLSI circuit design in mapping it with a well-known NP-complete problem, the minimum rectilinear Steiner tree (MRST) problem. IWO meta-heuristic algorithm is proposed to meet the MRST problem more efficiently and thereby reducing the overall wire-length of interconnected nodes. Further, the proposed approach is hybridized with PSO, and a comparative analysis is performed with geosteiner 5.0.1 and existing PSO technique over minimization, consistency and convergence against available benchmark.

Findings

This paper provides high performance–enhanced IWO algorithm, which keeps in generating low MRST value, thereby successful wire length reduction of VLSI circuits is significantly achieved as evident from the experimental results as compared to PSO algorithm and also generates value nearer to geosteiner 5.0.1 benchmark. Even with big VLSI instances, hybrid IWO with PSO establishes its robustness over achieving improved optimization of overall wire length of VLSI circuits.

Practical implications

This paper includes implications in the areas of optimization of VLSI circuit design specifically in the arena of VLSI routing and the recent developments in routing optimization using meta-heuristic algorithms.

Originality/value

This paper fulfills an identified need to study optimization of VLSI circuits where minimization of overall interconnected wire length in global routing plays a significant role. Use of nature-based meta-heuristics in solving the global routing problem is projected to be an alternative approach other than conventional method.

Details

Circuit World, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0305-6120

Keywords

Article
Publication date: 12 January 2010

Zohreh Shahnavaz, Wan Jeffrey Basirun and Sharifuddin Mohd. Zain

The purpose of this paper is to study the inhibitory activity of benzene‐1,2,4,5‐tetracarboxylic dianhydride (PMDH) on aluminium corrosion in hydrochloric acid 1 M HCl.

Abstract

Purpose

The purpose of this paper is to study the inhibitory activity of benzene‐1,2,4,5‐tetracarboxylic dianhydride (PMDH) on aluminium corrosion in hydrochloric acid 1 M HCl.

Design/methodology/approach

The inhibitive effect of PMDH towards the corrosion of aluminium in 1 M HCl solution is studied by means of electrochemical impedance spectroscopy, polarization curves (LSV) and scanning electron microscopic techniques. The effect of inhibitor concentration and temperature against inhibitor action is investigated.

Findings

In the presence of inhibitor (PMDH), the corrosion resistance of aluminium is improved and the corrosion rate and corrosion current are reduced, therefore the inhibition efficiency and polarization resistance are increased. With increasing temperature and decreasing inhibitor concentrations, the rate of aluminium corrosion increased. The surfactant acts as mixed type inhibitor and obeys a Langmuir isotherm.

Originality/value

The results shown in this paper are an insight to the understanding of the corrosion resistance and electrochemical behaviour of aluminium for future industrial applications and development.

Details

Anti-Corrosion Methods and Materials, vol. 57 no. 1
Type: Research Article
ISSN: 0003-5599

Keywords

Article
Publication date: 1 August 2005

R. Ravichandran, S. Nanjundan and N. Rajendran

Copper and its alloys are widely used in industries because of their good resistance to corrosion and are often used in cooling water systems. Brass has been widely used…

Abstract

Purpose

Copper and its alloys are widely used in industries because of their good resistance to corrosion and are often used in cooling water systems. Brass has been widely used for shipboard condensers, power plant condensers and petrochemical heat exchangers. Brass is susceptible to the corrosion process known as dezincification by means of which brass looses its valuable physical and mechanical properties leading to failure of structure. The aim of this investigation was to control the dezincification of brass in 3 per cent NaCl solution using benzotriazole (BTA) derivatives.

Design/methodology/approach

BTA derivatives namely 1‐hydroxymethylbenzotriazole (HBTA) and N,N‐dibenzotriazol‐l‐ylmethylamine(ABTA) were synthesised and their inhibition behaviour on brass in 3 per cent NaCl solution was investigated by the weight‐loss method, potentiodynamic polarisation, electrochemical impedance and solution analysis techniques. The morphology of the brass after corrosion in the presence and absence of the BTA derivatives was examined using scanning electron microscopy (SEM).

Findings

Potentiodynamic polarisation studies showed that the BTA derivatives investigated were mixed type inhibitors, inhibiting the corrosion of brass by blocking the active sites of the brass surface. Changes in the impedance parameters (charge transfer resistance and double layer capacitance) were related to the adsorption of BTA derivatives on the brass surface, leading to the formation of a protective film. Solution analysis revealed that the BTA derivatives excellently controlled the corrosion of brass. SEM micrographs showed the formation of compact surface film on the brass surface in the presence of inhibitors, thereby providing better corrosion inhibition.

Originality/value

Contributes to research on corrosion protection for copper and its alloys.

Details

Anti-Corrosion Methods and Materials, vol. 52 no. 4
Type: Research Article
ISSN: 0003-5599

Keywords

Article
Publication date: 23 February 2022

Alfonso Mendoza-Velázquez, Luis Carlos Ortuño-Barba and Luis David Conde-Cortés

This paper aims to examine the dynamic nexus between corporate governance (CG) and firm performance in hybrid model countries. It also investigates the effect of…

Abstract

Purpose

This paper aims to examine the dynamic nexus between corporate governance (CG) and firm performance in hybrid model countries. It also investigates the effect of horizontal agency conflicts on CG adherence.

Design/methodology/approach

This research uses vector autoregression methods and dynamic panels to examine the cross-sectional and longitudinal association between CG and performance, using three CG adherence indexes of transparency, management and board governance. The data set includes annual market and firm performance data from a sample of 93 companies trading in the Mexican stock market for the period 2010–2016.

Findings

This study finds evidence of dynamic interdependence between CG and firm performance, as well as weak effects of CG adherence on firms’ performance. The adverse effect of increasing return on equity and return on assets (ROE-ROA) gaps on CG adherence, which results from agency conflicts and insider ownership, is likely behind the weak association between CG and firm performance.

Originality/value

The findings in this study provide evidence that hybrid systems weaken the nexus between CG and firm performance. The propensity to prefer banking and bond debt to issuing stocks, as indicated by a greater ROE-ROA gap, points to favorable provisions for majority shareholders, adverse normative environments for minority shareholders and a low level of compliance with CG measures, among other problems.

Article
Publication date: 1 March 2005

Branka Mraović

Following Braudel's conceptualization of capitalism and Arrighi's periodization of systemic cycles of accumulation, the authors focus on the patterns of recurrence of…

Abstract

Following Braudel's conceptualization of capitalism and Arrighi's periodization of systemic cycles of accumulation, the authors focus on the patterns of recurrence of financial expansions enabling capitalism to revitalize itself through crisis; in this, crisis is considered in both aspects — crisis‐as‐restructuring and crisis‐as‐rupture. The ways in which finance aided by the blocks of governmental and business agencies in the present stage affects investment and business cycles result in a progressive increase of inequality between rich and poor countries, as well as inequality within the most developed countries. The authors tackle the crisis phenomenon through a genealogical analysis of the formation, consolidation and disintegration of the successive regimes of accumulation on a world scale through which the capital economy expands. They furthermore examine the crisis of capitalist accumulation through the relation of money and the state, which leads them to the field of debates on the changed relationship between the global economy and the national state. However, the crisis is also marked by a milestone which, despite dangers and pitfalls, opens up endless possibilities. They end the paper with a critique of the politics of money and advocate a socially responsible finance management, which will pave the way for a structure of society in which humanity will exist as an end in itself, rather than as a resource for the accumulation of money.

Details

Social Responsibility Journal, vol. 1 no. 3/4
Type: Research Article
ISSN: 1747-1117

Article
Publication date: 1 March 2006

Branka Mraovic

Following Braudel’s conceptualization of capitalism and Arrighi’s periodization of systemic cycles of accumulation, the authors focus on the patterns of recurrence of…

Abstract

Following Braudel’s conceptualization of capitalism and Arrighi’s periodization of systemic cycles of accumulation, the authors focus on the patterns of recurrence of financial expansions enabling capitalism to revitalize itself through crisis; in this, crisis is considered in both aspects ‐ crisis‐as‐restructuring and crisis‐as‐rupture. The ways in whichfinance aided by the blocks of governmental and business agencies in the present stage affects investment and business cycles result in a progressive increase of inequality between rich and poor countries, as well as inequality within the most developed countries. The authors tackle the crisis phenomenon through a genealogical analysis of the formation, consolidation and disintegration of the successive regimes of accumulation on a world scale through which the capital economy expands. They furthermore examine the crisis of capitalist accumulation through the relation of money and the state, which leads them to the field of debates on the changed relationship between the global economy and the national state. However, the crisis is also marked by a milestone which, despite dangers and pitfalls, opens up endless possibilities. They end the paper with a critique of the politics of money and advocate a socially responsible finance management, which will pave the way for a structure of society in which humanity will exist as an end in itself, rather than as a resource for the accumulation of money.

Details

Social Responsibility Journal, vol. 2 no. 3/4
Type: Research Article
ISSN: 1747-1117

Keywords

Article
Publication date: 7 January 2019

Chee Yong Fong, Sha Shiong Ng, NurFahana Mohd Amin, Fong Kwong Yam and Zainuriah Hassan

This study aims to explore the applicability of the sol-gel-derived GaN thin films for UV photodetection.

Abstract

Purpose

This study aims to explore the applicability of the sol-gel-derived GaN thin films for UV photodetection.

Design/methodology/approach

GaN-based ultraviolet (UV) photodetector with Pt Schottky contacts was fabricated and its applicability was investigated. The current-voltage (I-V) characteristics of the GaN-based UV photodetector under the dark current and photocurrent were measured.

Findings

The ideality factors of GaN-based UV photodetector under dark current and photocurrent were 6.93 and 5.62, respectively. While the Schottky barrier heights (SBH) for GaN-based UV photodetector under dark current and photocurrent were 0.35 eV and 0.34 eV, respectively. The contrast ratio and responsivity of this UV photodetector measured at 5 V were found to be 1.36 and 1.68 μA/W, respectively. The photoresponse as a function of time was measured by switching the UV light on and off continuously at different forward biases of 1, 3 and 6 V. The results showed that the fabricated UV photodetector has reasonable stability and repeatability.

Originality/value

This work demonstrated that GaN-based UV photodetector can be fabricated by using the GaN thin film grown by low-cost and simple sol-gel spin coating method.

Details

Microelectronics International, vol. 36 no. 1
Type: Research Article
ISSN: 1356-5362

Keywords

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