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Article
Publication date: 1 December 2003

M. Tariq Saeed and Sk. Asrof Ali

A variety of bisquaternary ammonium salts was prepared for the first time by reacting N,N,N′,N′‐tetraallyl‐1,6‐hexanediamine with allyl chloride, propargyl chloride…

Abstract

A variety of bisquaternary ammonium salts was prepared for the first time by reacting N,N,N′,N′‐tetraallyl‐1,6‐hexanediamine with allyl chloride, propargyl chloride, benzyl chloride, and 1‐bromododecane in excellent yields (>90 per cent). Inhibition efficiency for different concentrations of the synthesised compounds for the inhibition of corrosion of carbon steel in 1 M HCl exposed for 6 h at 60°C was determined gravimetrically. The bisquaternary salts exhibited excellent inhibition efficiencies (97‐99 per cent) in the acidic solution containing 400 ppm of the inhibitor. Comparable results were obtained by the electrochemical method using Tafel plots for the inhibition efficiency of the synthesised compounds. The adsorption of these compounds on carbon steel surface was found to obey Temkin's adsorption isotherm. The work marked the beginning of constituting an important class of new inhibitors containing multiple adsorption centres of positive nitrogens as well as π‐donor moieties.

Details

Anti-Corrosion Methods and Materials, vol. 50 no. 6
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 June 2003

M. Tariq Saeed, Sk. Asrof Ali and S.U. Rahman

Several cyclic hydroxylamines containing hydrophobic substituents were prepared. All these hydroxylamines were tested for corrosion inhibition of carbon steel in 1M HCl at…

Abstract

Several cyclic hydroxylamines containing hydrophobic substituents were prepared. All these hydroxylamines were tested for corrosion inhibition of carbon steel in 1M HCl at 60°C by gravimetric and electrochemical methods. All compounds showed excellent corrosion inhibition efficiency (IE per cent) in acidic solutions containing 400 ppm of the inhibitors; Inhibitor Efficiencies in the range 66‐98 per cent were measured by the gravimetric method. Comparable results were obtained by the electrochemical method using Tafel plots for the IE of some of the selected synthesised compounds.

Details

Anti-Corrosion Methods and Materials, vol. 50 no. 3
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 December 2004

M. Tariq Saeed

The cycloaddition of cyclic nitrone1‐pyrroline‐1‐oxide with 1‐dodecene and 1‐hexadecene afford a bicyclic (isoxazolidines). These isoxazolidines were tested for corrosion…

Abstract

The cycloaddition of cyclic nitrone1‐pyrroline‐1‐oxide with 1‐dodecene and 1‐hexadecene afford a bicyclic (isoxazolidines). These isoxazolidines were tested for corrosion inhibition of carbon steel in 1N H2SO4 in the 30‐60°C temperature range by gravimetric and electrochemical methods. The compound isoxazolidines exhibited excellent inhibition efficiency in the acidic corrosion environment. The presence of heteroatoms such as N and O induce greater adsorption of the inhibitor molecules onto the surface of carbon steel and the long hydrocarbon chains ensure coverage of the metal surface. The values of activation energy and free energy of adsorption indicated the physical nature of the adsorption on the surface of the carbon steel. Thermodynamic parameters were determined for the adsorption process (ΔGadso, ΔHadso, ΔSadso), and kinetic parameters for the metal dissolution (or hydrogen evolution) reaction in the presence of the isoxazolidines. The adsorption of inhibitors on the metal surface was found to obey the Langmuir adsorption isotherm. The isoxazolidines were found to be mixed‐type inhibitors. The isoxazolidine which had a tetradecyl hydrophobe was found to be a better inhibitor than was the decyl analogue.

Details

Anti-Corrosion Methods and Materials, vol. 51 no. 6
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 3 January 2017

Khasan S. Karimov, Zubair Ahmad, Noshin Fatima, Muhammad Mansoor Ahmed and Muhammad Abid

The paper aims to study the effects of humidity on the electrical properties of copper phthalocyanine (CuPc) thin films deposited at different gravity conditions.

Abstract

Purpose

The paper aims to study the effects of humidity on the electrical properties of copper phthalocyanine (CuPc) thin films deposited at different gravity conditions.

Design/methodology/approach

Surface-type samples were fabricated on glass substrates with preliminary-deposited copper electrodes. The CuPc solution was prepared in benzene. The thin films of CuPc were deposited on these substrates at diverse gravity conditions by drop-casting and centrifugation at 1 × g and 70 × g, respectively. Impedance and capacitance of the fabricated devices were measured against the different relative humidity ranging from 32 to 98 per cent.

Findings

The impedance and the capacitance of the CuPc film were found to be dependent on the ambient humidity levels (32-98 per cent) and the gravity conditions (1 × g and 70 × g) opted during the fabrication process.

Research limitations/implications

The centrifugation technique can potentially be used in the instrumentation industry for the fabrication of humidity sensors.

Practical implications

The results of the investigations can potentially be used in the instrumentation and optoelectronics industry for the fabrication of humidity sensors.

Originality/value

CuPc films were deposited from a solution in benzene using drop-casting and centrifugation. The electrical properties of the films were found to be dependent on film fabrication conditions and ambient humidity levels. Growth-dependent electrical properties of the CuPc films can be explained by considering their structure.

Details

Pigment & Resin Technology, vol. 46 no. 1
Type: Research Article
ISSN: 0369-9420

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Article
Publication date: 20 May 2021

Muhammad Usman Tariq, Muhammad Babar, Marc Poulin and Akmal Saeed Khattak

The purpose of the proposed model is to assist the e-business to predict the churned users using machine learning. This paper aims to monitor the customer behavior and to…

Abstract

Purpose

The purpose of the proposed model is to assist the e-business to predict the churned users using machine learning. This paper aims to monitor the customer behavior and to perform decision-making accordingly.

Design/methodology/approach

The proposed model uses the 2-D convolutional neural network (CNN; a technique of deep learning). The proposed model is a layered architecture that comprises two different phases that are data load and preprocessing layer and 2-D CNN layer. In addition, the Apache Spark parallel and distributed framework is used to process the data in a parallel environment. Training data is captured from Kaggle by using Telco Customer Churn.

Findings

The proposed model is accurate and has an accuracy score of 0.963 out of 1. In addition, the training and validation loss is extremely less, which is 0.004. The confusion matric results show the true-positive values are 95% and the true-negative values are 94%. However, the false-negative is only 5% and the false-positive is only 6%, which is effective.

Originality/value

This paper highlights an inclusive description of preprocessing required for the CNN model. The data set is addressed more carefully for the successful customer churn prediction.

Details

Journal of Modelling in Management, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1746-5664

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Article
Publication date: 7 May 2019

Essia Ries Ahmed, Md Aminul Islam, Tariq Tawfeeq Yousif Alabdullah and Azlan Bin Amran

This paper aims to investigate the influence of the determinants (pricing, type of structure, Shariah auditing, Shariah risk and Shariah documentation) and the sukuk

Abstract

Purpose

This paper aims to investigate the influence of the determinants (pricing, type of structure, Shariah auditing, Shariah risk and Shariah documentation) and the sukuk legitimacy among Islamic financial institutions using a qualitative approach. The paper further explained the significance of the determinants on legitimacy, evaluated the relationship between sukuk characteristics and sukuk legitimacy and examined the moderating effect of Shariah Supervisory Board (SSB) on the relationship.

Design/methodology/approach

The study used a purposive sampling technique to select the target respondents required for the survey (semi-structured interview). This technique is applied by selecting members of SSBs among Islamic financial institutions. A total number of ten members are selected as the sample size for the study based on their experience and basic knowledge of Fiqh Al-Mua’malat and its application in Islamic financial institutions.

Findings

The findings revealed that the determinants have a significant impact on the sukuk legitimacy, meaning that there is a positive and significant relationship between the determinants and the sukuk legitimacy. In addition, this study indicates the empirical evidence of the moderating effect of SSB on the relationship between the determinants and the sukuk legitimacy.

Practical implications

This study has added to the literature by examining the determinants of sukuk legitimacy while evaluating the moderating effect of SSB on the relationship. Besides, this might add benefits to the numerous Islamic financial institutions relating to the amendment of its regulatory frameworks with the view to pushing the sukuk market investors to move toward asset-backed structure. In addition, the SSB in central banks must also focus its attention regarding the sukuk legitimacy and its application among the various Islamic financial institutions.

Originality/value

This study has added a new discussion to the body of knowledge, i.e. examining the sukuk legitimacy and its relationship with sukuk determinants; hence, an approach that is not widely discussed in the previous studies. Furthermore, conducting such research in the field of Islamic finance provides novelty in the literature among both emerging and developed economies including Malaysia. This is because to the best knowledge of the researchers, there was no empirical study (within the literature) that combined these variables and evaluated their empirical significance. Accordingly, this would enlighten the Islamic Ummah and propel the society’s intensity toward contributing to knowledge and might further provide clarification on the determinants and the sukuk legitimacy to prospective scholars, precisely on the moderating effect of SSB on the relationship between determinants and legitimacy of sukuk.

Details

Journal of Islamic Accounting and Business Research, vol. 10 no. 3
Type: Research Article
ISSN: 1759-0817

Keywords

Content available
Article
Publication date: 29 July 2021

Muhammad Tariq Majeed and Abida Zainab

In recent years, the fast growth of Islamic banks (IBs) has generated debates among policymakers and economists about the sustainability and performance of these…

Abstract

Purpose

In recent years, the fast growth of Islamic banks (IBs) has generated debates among policymakers and economists about the sustainability and performance of these institutions. This paper aims to undertake a comparative analysis of the financial performance of IBs and conventional banks (CBs) in Pakistan over the period 2008–2019 to evaluate how IBs are faring compared to their conventional peers.

Design/methodology/approach

This paper considers financial ratio analysis (FRA) to analyze and compare the performance of the top-10 IBs and CBs operating in Pakistan. The sample includes five full-fledged IBs and five CBs which offer Islamic windows in Pakistan. We have selected the top-5 best performing CBs offering Islamic windows. This study offers a comparative analysis of Islamic v/s conventional banks.

Findings

The results show that Islamic banks are better capitalized, less risky and have higher liquidity. In contrast, the profit of Islamic banks is found lower than CBs. The logical reasoning behind these performance indicators has been discussed in detail.

Research limitations/implications

The study has provided an analysis of financial performance only for Pakistan. A cross-country analysis could be more representative of the performance of Islamic Banks.

Practical implications

The size of Islamic banking industry should be enhanced by opening new branches and promoting Islamic finance literacy.

Originality/value

The study assists investors, borrowers and managers in making better decisions. It also provides the latest valuable information to regulators and policymakers in making rules and policies for the financial industry in Pakistan.

Details

ISRA International Journal of Islamic Finance, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0128-1976

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Book part
Publication date: 23 September 2014

Glenn Growe, Marinus DeBruine, John Y. Lee and José F. Tudón Maldonado

This paper examines the profitability and performance measurement of U.S. regional banks during the period 1994–2011, using the GMM estimator technique. Our study extends…

Abstract

Purpose

This paper examines the profitability and performance measurement of U.S. regional banks during the period 1994–2011, using the GMM estimator technique. Our study extends prior research by including several factors not previously considered using U.S. data.

Approach

We use bank-specific, industry-specific, and macroeconomic determinants of profitability contemporaneous with our performance indicators. We follow the accounting fundamental analysis path in explaining the bank performance.

Findings

Among the performance measures, the efficiency ratio and provisions for credit losses are negatively and equity scaled by assets is positively related to profitability. However, these relationships either reverse (efficiency ratio and provisions for credit losses) or become insignificant (equity scaled by assets) when the target becomes change in profitability. The level of nonperforming assets is negatively related to profitability across all measures of profitability used. Macroeconomic variables are largely unrelated to profitability during the year they are measured. However, they have a significant relationship with earnings change measures, suggesting they have a lagged effect on profitability. The slope of the yield curve is especially strong in this regard.

Originality

We use our determinants to model changes in bank profitability one year ahead, in addition to including several factors not previously considered, using the predictive focus of the fundamental analysis research.

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Article
Publication date: 29 August 2018

Muhammad Masood Rafi, Tariq Aziz and Sarosh Hashmat Lodi

Disaster management information systems (DMISs) have been proposed in different parts of the world for effective response to a disaster. The purpose of this paper is to…

Abstract

Purpose

Disaster management information systems (DMISs) have been proposed in different parts of the world for effective response to a disaster. The purpose of this paper is to: compare design approaches of these DMISs; examine similarities in the design of databases and communication infrastructure; and draw conclusions. Based on the examination of the studies, future opportunities have been identified and discussed.

Design/methodology/approach

The studies in the available literature on the designs of automated DMISs have been reviewed in the presented paper to identify similarities in design premise, conceptual design and design considerations.

Findings

The examination of the available studies indicates that the research on DMIS has increased significantly in different countries of the world since 2004. Data of baseline information and available resources are required by most of the presented studies, as these data are necessary for effective response to a disaster. The communication infrastructures suggested include local area network, wide area network and satellite communication for better coordination between the responders and different relief agencies at different locations. The connectivity to these networks is possible through Ethernet, Wi-Fi, general packet radio service or satellite.

Research limitations/implications

Although the research on DMIS has increased significantly over the last one decade, the studies are still few in numbers. Similarly, only few of the proposed systems have been developed and tested during a real disaster.

Practical implications

The presented review of available studies provides a holistic view of the proposed DMISs which could be useful to the disaster management authorities.

Originality/value

The paper provides valuable information on the differences in the proposed DMISs. This can help in identifying the gaps for future improvements for increased effectiveness of a DMIS. The future opportunities have also been identified in the presented paper and are discussed.

Details

Online Information Review, vol. 42 no. 6
Type: Research Article
ISSN: 1468-4527

Keywords

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Article
Publication date: 14 December 2017

Yasir Tanveer, Qi Jiayin, Umair Akram and Anum Tariq

Conflicts are inevitable in organizations and are a significant challenge for frontline managers (FLMs). This study aims to investigate the relationship between the…

Abstract

Purpose

Conflicts are inevitable in organizations and are a significant challenge for frontline managers (FLMs). This study aims to investigate the relationship between the leadership styles of FLMs and relationship conflicts (RLCs), with the indirect intervention of emotion regulation (ER) and five conflict-handling styles (CHSs).

Design/methodology/approach

Research data were obtained from 243 FLMs in the Pakistan textile industry. SPSS 23 and PROCESS macros software were used to test and verify hypotheses regarding leadership styles, ER, CHSs and RLC. The authors conducted 5,000 bootstrap replications to verify mediation.

Findings

Leadership styles are significantly associated with RLC. A high degree of ER can negatively moderate RLCs through transformational leadership (TFL) and transactional leadership (TCL) styles and positively moderate RLCs through a laissez-faire leadership (LZF) style. Among CHSs, a compromise style mediates the relationship between RLC and the TFL and LZF styles, and a domination style mediates the relationship between RLC and the TCL style.

Practical implications

FLMs should be trained to overcome workplace interpersonal conflicts. Appropriate cognizance of a conflict before it occurs is a requisite skill. FLMs must be able to use all five given CHSs.

Originality/value

This study identifies the association of leadership styles with CHSs and ER to manage RLC in a non-Western context. The study enhances understanding of the use of the ER factor with the different CHSs of FLMs.

Details

International Journal of Conflict Management, vol. 29 no. 1
Type: Research Article
ISSN: 1044-4068

Keywords

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