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1 – 10 of 117
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

Keywords

Article
Publication date: 9 May 2008

Laiq Khan, Tariq Saeed and K.L. Lo

Modern power systems suffer from a well‐known problem of low‐frequency oscillations. Flexible AC transmission systems devices are used to overcome this problem. The aim of…

Abstract

Purpose

Modern power systems suffer from a well‐known problem of low‐frequency oscillations. Flexible AC transmission systems devices are used to overcome this problem. The aim of this paper is to develop a particle swarm optimization (PSO) based supplementary damping control system design for thyristor control series compensator (TCSC).

Design/methodology/approach

The problem is formulated as an optimization problem with an eigenvalue‐based multi‐objective function. PSO is then used to find optimal set of controller parameters by minimizing the objective function.

Findings

The performance and robustness of the proposed approach is validated through small signal and large signal for different loading conditions of a multi‐machine power system.

Originality/value

The paper presents a novel PSO‐based control system design that exhibits robustness and excellent damping performance.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 27 no. 3
Type: Research Article
ISSN: 0332-1649

Keywords

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

Keywords

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…

1326

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

Keywords

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

Keywords

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. 17 no. 3
Type: Research Article
ISSN: 1746-5664

Keywords

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

Article
Publication date: 21 September 2021

Umair Saeed Bhutta, Aws AlHares, Yasir Shahab and Adeel Tariq

This study aims to investigate two important research questions. First, this research examines the impact of real earnings management on investment inefficiency of the…

Abstract

Purpose

This study aims to investigate two important research questions. First, this research examines the impact of real earnings management on investment inefficiency of the non-financial listed firms in Pakistan. Second, this research further explores the moderating role of short-term debt on the nexus between real earnings management and investment inefficiency. This study attempts to highlight an important research problem i.e. the jinx of real earnings management from the context of an emerging economy.

Design/methodology/approach

This study employs the data from non-financial listed firms in Pakistan over the period from 2008 to 2018. The study uses panel data methodologies with firm and year fixed-effects to examine the proposed hypotheses. The results are robust to the use of sensitivity analysis, different estimation techniques and endogeneity issues (using two-stage least squares (2SLS) and generalized method of moments (GMM) techniques).

Findings

The results of the research are twofold. First, consistent with the theoretical arguments, the findings reveal that real earnings management increases investment inefficiency and results in over-investments by the firms. Second, short-term debt attenuates the relationship between real earnings management and investment inefficiency. It implies that a higher level of short-term debt weakens the adverse effects of real earnings management on the investment efficiency of the firm.

Originality/value

This study offers original findings on the issues pertaining to the quality of accounting and financial reporting in an emerging economy like Pakistan, where the implementation of regulations is weak in the corporate world and management frequently exploits shareholders' wealth for the short-term benefits.

Details

Journal of Accounting in Emerging Economies, vol. 12 no. 2
Type: Research Article
ISSN: 2042-1168

Keywords

Article
Publication date: 10 February 2022

Aaisha Khatoon, Nawab Ali Khan, Farhana Parvin, Mohammad Salman Wahid, Mohd Tariq Jamal and Saad Azhar

The objective of the work is to have an insight into the degree of the contemporary concept of greening the organization through human resource management (HRM) and to…

Abstract

Purpose

The objective of the work is to have an insight into the degree of the contemporary concept of greening the organization through human resource management (HRM) and to attempt to bridge the gap toward environmental awareness, as well as to observe the dimensions of green HRM (GHRM) practices and its impression toward environmental sustainability by using analytical hierarchy process (AHP) and FAHP.

Design/methodology/approach

The research was carried out in two phases; multi-method was employed. The first phase mainly includes a systematic review to convene comprehensive knowledge of widespread GHRM practices to leverage environmental sustainability. In the second phase, the AHP and fuzzy AHP (FAHP) were employed to examine the influence of the respective dimension of GHRM practices toward environmental sustainability.

Findings

This study emphasizes the status of GHRM practices such as green recruitment and green selection, green performance management, green training and development, green compensation and rewards, green welfare aspects as a way to aid environmental issues. The findings suggest that these initiatives help to leverage environmental sustainability. Further, this paper reveals that green compensation and rewards have the highest impact on leveraging environmental sustainability. However, this study also emphasizes the comparative study of GHRM dimensions through AHP and FAHP.

Originality/value

As existing studies reveal, there is least research carried on this field of study and no study was conducted using AHP and FAHP in this field. Thus, this study reveals the necessity to discover the degree of concern toward GHRM practices in context to India.

Article
Publication date: 4 September 2017

Wei Xie, Tariq Ali, Qi Cui and Jikun Huang

The purpose of this paper is to examine the potential economic impacts of China’s insect-resistant GM maize and provide new evidence for decision making concerning its…

Abstract

Purpose

The purpose of this paper is to examine the potential economic impacts of China’s insect-resistant GM maize and provide new evidence for decision making concerning its commercialization.

Design/methodology/approach

This study uses data drawn from the production trials of insect-resistant GM maize and expert interviews to determine the impacts of commercializing GM maize at farm level under three scenarios with varying severity of insect pest attacks in maize production. Economic impacts are simulated using a modified Global Trade Analysis Project model.

Findings

In farm terms, insect-resistant GM maize increases crop yield and reduces both pesticide and labor inputs. In national terms, China can increase its GDP by USD8.6 billion and maize self-sufficiency by about 2 percent given normal insect pest attacks if China commercializes GM maize. Additional beneficiaries include consumers and the livestock industry. Non-maize crops can also benefit from land saving through GM maize commercialization. Chemical is a sector with the decrease in its output because demand for pesticides will fall.

Originality/value

Although China has announced a roadmap for commercializing GM crops for use as feed and in processing after nearly two decades of producing GM cotton, no clear timetable for producing GM maize as feed has been established due to several concerns, including the potential for economic gains from GM maize. This study is the first to assess the economic impacts of commercializing China’s GM maize. The findings should have significant policy implications for the development and commercialization of GM crops in general and GM maize in particular.

Details

China Agricultural Economic Review, vol. 9 no. 3
Type: Research Article
ISSN: 1756-137X

Keywords

1 – 10 of 117