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Waris, Muhammad Bilal,Ishihara, Takeshi Techno-Press 2012 Coupled systems mechanics Vol.1 No.3
A finite element model is developed for dynamic response prediction of floating offshore wind turbine systems considering coupling of wind turbine, floater and mooring system. The model employs Morison's equation with Srinivasan's model for hydrodynamic force and a non-hydrostatic model for restoring force. It is observed that for estimation of restoring force of a small floater, simple hydrostatic model underestimates the heave response after the resonance peak, while non-hydrostatic model shows good agreement with experiment. The developed model is used to discuss influence of heave plates and modeling of mooring system on floater response. Heave plates are found to influence heave response by shifting the resonance peak to longer period, while response after resonance is unaffected. The applicability of simplified linear modeling of mooring system is investigated using nonlinear model for Catenary and Tension Legged mooring. The linear model is found to provide good agreement with nonlinear model for Tension Leg mooring while it overestimates the surge response for Catenary mooring system. Floater response characteristics under different wave directions for the two types of mooring system are similar in all six modes but heave, pitch and roll amplitudes is negligible in tension leg due to high restraint. The reduced amplitude shall lead to reduction in wind turbine loads.
The Cost Monitoring of Construction Projects through Earned Value Analysis
Waris, Muhammad,Khamidi, Mohd Faris,Idrus, Arazi Korea Institute of Construction Engineering and Ma 2012 Journal of construction engineering and project ma Vol.2 No.4
In construction industry, the term 'procurement' is considered as a project based job where clients and contractors are always keen to observe performance indicators. These indicators represent financial and non-financial efficiency of project activities. Among these, the monitoring of financial indicators such as cost monitoring is an ongoing process and its importance cannot be undermined during the project life cycle. It can be monitored by using traditional approach of direct reporting of actual cost against budget. However, the comparison of budget versus actual spending does not indicate the worth of the work which is completed at any given time. This approach does not represent the true cost performance of the project. Because of these limitations, this paper discusses the applications of Earned Value Analysis (EVA) for cost monitoring of construction projects in Malaysia. Besides traditional approach, EVA is a three-dimensional approach that compares three cost indicators i.e. the budgeted value of work scheduled with the earned value of physical work completed and the actual cost of work completed. Therefore, cost monitoring by EVA is an objective measure of actual work performed. This paper uses a case study, an example application of EVA as a cost monitoring tool. This case study reaffirms the benefits of using EVA for project cash flow analysis and forecasting.
Irfan Waris Muhammad,Muhammad Kaleem Ullah Rana,Wang Man-Qun 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.3
The insect olfactory system is sensitive to the complicated chemical environment. Insect’s chemosensory proteins (CSPs) supposedly act as transport of plant volatiles across the sensillar lymph and competitive fluorescent binding assay was commonly used to test the binding affinities with various plant volatiles. However, extensive research to determine the physiological role of CSPs is necessary and helpful through binding interaction of a protein with the plant volatiles. In this comparative study, we employed phylogenetic analysis, fluorescence spectra, quenching mode, and thermodynamic force to characterize Nilaparvata lugens CSP3 (NlugCSP3). The phylogenetic tree revealed that amino acid sequence of NlugCSP3 showed extremely close similarities with Laodelphax striatella (LstrCSP10 & LstrCSP11) and Sogatella furcifera (SurCSP3). The Stern-Volmer (SV) curve of NlugCSP3 fluorescence quenching indicated that nonadecane and 2-tridecanone clearly quenched NlugCSP3 fluorescence as a stable static quenching mode. Meanwhile, α-terpinene and farnesene collided with NlugCSP3, instead of forming stable complexes. The thermodynamic analysis of NlugCSP3 revealed that spontaneous binding interaction occurred in nonadecane and 2-tridecanone and is driven primarily by hydrophobic in teractions. This study not only provides the information about the binding interaction of protein with the vol atiles, but also improves the efficient recognition of behaviorally elicited volatiles that could be used in the management of brown planthopper.
A Study of Safety and Security Enhancement Measures of Sharing Accommodation Platform ‘Airbnb’
Maryam Waris,김승인 차세대컨버전스정보서비스학회 2023 Journal of Digital Media & Culture Technology Vol.3 No.2
This research examines the intricate challenges of establishing trust and ensuring safety in the sharing economy, focusing on the renowned peer-to-peer platform Airbnb. Despite the platform’s global success, concerns persist regarding safety and security measures. The study employs a mixed-methods approach, combining quantitative surveys and qualitative interviews to comprehensively explore user perceptions and identify areas for improvement. Findings indicate a generally positive outlook on Airbnb’s safety measures, particularly identity verification, payment security, and accuracy. However, nuanced concerns exist, particularly in areas like background checks, neighborhood safety and emergency protocols. The study underscores the importance of sustained investment in safety resources, improved communication, and conflict resolution strategies. Furthermore, it advocates for comprehensive guest/host education programs and collaboration with industry experts to address evolving safety challenges in the dynamic landscape of the sharing economy.
A Comprehensive Study of SARS-CoV-2: From 2019-nCoV to COVID-19 Outbreak
( Abdul Waris ),( Muhammad Ali ),( Atta Ullah Khan ),( Asmat Ali ),( Abdul Baset ) 한국미생물 · 생명공학회 2020 한국미생물·생명공학회지 Vol.48 No.3
The coronavirus disease 2019 (COVID-19) is a highly contagious pneumonia that has spread throughout the world. It is caused by a novel, single stranded RNA virus called severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Genetic analysis revealed that, phylogenetically, the SARS-CoV-2 is related to severe acute respiratory syndrome-like viruses seen in bats. Because of this, bats are considered as a possible primary reservoir. The World Health Organization has declared the COVID-19 outbreak as a pandemic. As of May 27, 2020, more than 5,406,282 confirmed cases, and 343,562 confirmed deaths have been reported worldwide. Currently, there are no approved vaccines or antiviral drugs available against COVID-19. Newly developed vaccines are in the first stage of clinical trials, and it may take a few months to a few years for their commercialization. At present, remdesivir and chloroquine are the promising drugs for treating COVID-19 patients. In this review, we summarize the diversity, genetic variations, primary reservoirs, epidemiology, clinical manifestations, pathogenesis, diagnosis, treatment strategies, and future prospects with respect to controlling the spread of COVID-19.
Review on metallic nanoparticles induced toxicity on renal function and overall health of kidneys
Ammara Waris,Saima Sharif,Shagufta Naz,Farkhanda Manzoor,Farzana Rashid,Sobia Tabassum,Farrukh Jamil,Murid Hussain,Yong Jun Choi,Young-Kwon Park 대한환경공학회 2024 Environmental Engineering Research Vol.29 No.4
Recently, innovative developments have been made in the rapidly developing field of nanotechnology. However, toxicity due to long-term exposure to various types of metal-based nanoparticles, especially metal and metal oxide nanoparticles, is gradually increasing. The kidney is prone to toxin-induced impairment because it is one of the main organs for eliminating multiple potentially dangerous substances, including nanoparticles (NPs), from mammals. However, the mechanisms underlying cytotoxicity triggered by various NPs have not yet been reported. This review summarizes the various mechanisms involved in metal-based nanoparticle-induced nephrotoxicity, focusing on Reactive Oxygen Species (ROS) production, which leads to oxidative stress and apoptosis. The mechanisms by which metal-based NPs cause serious side effects in the renal system and the specific toxicity of different types of metal NPs are also summarized.