Ghulam Ishaq Khan Institute of Engineering Sciences and Technology

About: Ghulam Ishaq Khan Institute of Engineering Sciences and Technology is a education organization based out in Topi, Pakistan. It is known for research contribution in the topics: Thin film & Quantum efficiency. The organization has 618 authors who have published 940 publications receiving 10674 citations.

Religious beliefs as a moderator of the relationships between workplace incivility and counterproductive work behaviours

Abstract: BACKGROUND: The current work describes the relationship between workplace incivility and counterproductive work behaviours as moderated by religious-inspired ethics. Drawing from conservation of resources theory, we consider workplace incivility a type of workplace stressor draining the cognitive and psychological resources of employees that make them effective and productive. We posit that individuals’ religious beliefs and work ethics based on these beliefs provide resources to employees to counter, balance, or offset the loss of productive psychological resources. OBJECTIVE: We investigate the buffering effects of Islamic work ethics on the relationship between workplace incivility and counterproductive work behaviours. METHODS: The sample includes 251 employees working in the healthcare sector in Pakistan. Hierarchical moderated multiple regression analysis was used to explore the relationships between workplace incivility, counterproductive work behaviours and Islamic work ethics. RESULTS: Our study results show that workplace incivility positively covaries with counterproductive work behaviours. However, Islamic work ethics negatively moderate this relationship. CONCLUSION: Theoretically, this study contributes by examining religious beliefs (Islamic work ethics) as a key resource that moderates the relationship between workplace incivility and counterproductive work behaviours. Furthermore, evidence regarding the different impacts of incivility on CWB-I and CWB-O in the Pakistani context agrees with the existing literature.

Precipitation Behavior of Thermo-Mechanically Treated Ti 50 Ni 20 Au 20 Cu 10 High-Temperature Shape-Memory Alloy

Abstract: In the present work, precipitation behavior of TiNiAuCu-based high-temperature shape-memory alloys is studied. Two alloys with compositions Ti50Ni30Au20 and Ti50Ni20Au20Cu10 were prepared. After 30 % cold rolling, both alloys were then annealed at different temperatures. Formation of Cu-rich TiAuCu and Ti-rich Ti3Au precipitates was observed in Ti50Ni20Au20Cu10 alloy when annealed at different temperatures after cold deformation. It was noticed that prior cold deformation has significant effect on the precipitation behavior. A similar kind of precipitation behavior has been previously reported in TiNiPdCu alloys. Both TiAuCu and Ti3Au type precipitates were found to be deficient in Ni content which causes an increase in Ni content of the matrix and a small decrease in transformation temperatures of the Ti50Ni20Au20Cu10 alloy.

Multistress Accelerated Aging and Tracking/Erosion-Resistance Investigation of High Voltage Polymeric Insulators

Abstract: All over the world, room temperature-vulcanized silicone rubber has been widely used for outdoor electrical and non-electrical applications. However, in outdoor applications, the electrical and non-electrical properties of weather-sheds/sheaths of polymeric insulators were gradually degraded over time, which has become an unavoidable issue. In this work, we have presented the 5000-h multistress accelerated laboratory-aging and tracking/erosion-resistance analysis of alumina-tri-hydrate/silica-filled SiR composites, simulating actual field environment of Islamabad (Pakistan). In addition, to quantify the blends surface resistance to tracking and erosion, the inclined plane test was conducted according to ASTM-D2303 standard. To evaluate distinct properties, various stresses such as heat, ultraviolet radiation, salt fog, acid rain and humidity were sequentially applied over weathering period in a multistress accelerated aging chamber. Summer and winter weathering cycles were so designed as they occurred in the actual environment. Moreover, to investigate the physical and chemical changes as a function of time (0–5000 h), critical visual inspection, leakage current statistics, hydrophobicity, Fourier transform infrared (FTIR) spectroscopy and tracking/erosion analysis tests were conducted as planned. Compared to neat SiR sample, slight discoloration/roughness was exhibited by all other specimens. The hydrophobicity, leakage current and tracking/erosion results of SiR composites showed a strong correlation between surface condition and performance with respect to leakage current and applied voltage over the weathering period. Moreover, the FTIR results of all blends showed a considerable hydrocarbon (C–H) loss of chemical groups compared to virgin samples. Hence, it is suggested that multistress accelerated aging along with tracking/erosion analysis tests can be adopted to quantify and analyze the insulators behavior in real world.

LWE-CPPA: a scheme for secure delivery of warning messages in VANETs

Abstract: Conditional privacy preserving authentication (CPPA) schemes preserve privacy of nodes and authenticate warning messages in vehicular ad hoc networks (VANETs). However, the existing key exchange processes are computationally expensive, which compel CPPAs to rely on temper proof devices with pre-installed keys. Moreover, transmission of messages occurs as plaintext, which provides an opportunity to adversaries to intercept and temper communication. Furthermore, CPPAs provide no means for dealing with blackhole attacks. In this paper, we present a novel light-weight encryption-enabled CPPA (LWE-CPPA) scheme that introduces encryption in warning messages. The scheme starts with the exchange of unique symmetric keys among nodes by using our proposed variant of Diffie-Hellman algorithm. After successful key exchange, the scheme uses our proposed VANETs specific novel lightweight encryption algorithm to yield a strong cipher for protection of messages from adversaries. An authentication process follows message encryption that makes our scheme robust. Furthermore, LWE-CPPA provides protection against blackhole attacks by employing a predefined threshold for warning messages acknowledgment. Simulation results demonstrate that LWE-CPPA provides improved security with reduced computational and communication overheads as compared to eminent CPPA schemes.