Browsing by Author "Wahab N.A."
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Publication Control of an underactuated double-pendulum overhead crane using improved model reference command shaping: Design, simulation and experiment(Academic Press, 2021) ;Jaafar H.I. ;Mohamed Z. ;Ahmad M.A. ;Wahab N.A. ;Liyana RamliShaheed M.H.This paper presents a new control scheme based on model reference command shaping (MRCS) for an overhead crane, with double-pendulum mechanism effects. The approach has an advantage in achieving an accurate trolley positioning, with low hook and payload oscillations, under various desired trolley positions and parameter uncertainties, without the requirement for measurement or estimation of system parameters. These are challenging in practice. The previously developed MRCS algorithm is improved in order to reduce its design complexity, as well as to ensure that it can be augmented with a feedback controller so that a concurrent controller tuning can be realised. The combined MRCS and feedback controller is used to achieve both, precise trolley positioning, and low hook and payload oscillations. To evaluate the effectiveness and the robustness of the approach, simulations and experiments using a nonlinear model and a laboratory double-pendulum crane are carried out. Under various desired positions and parameter uncertainties that involve varying the cable lengths (payload hoisting) and the payload mass variations, the superiority of the proposed approach is confirmed by achieving higher hook and payload oscillation reductions when compared with a recently proposed feedback controller. In addition, the desired trolley positions are achieved with smoother responses. � 2020 Elsevier Ltd - Some of the metrics are blocked by yourconsent settings
Publication Entrepreneurs’ characteristics from the islamic perspective: A study of muslimpreneurs’ performance(Hampstead Psychological Associates, 2020) ;Ismail A. ;Ismail F.L.M. ;Wahab N.A. ;Latiff L.A. ;Kandil H.M.T.E. ;Centre of Core Studies ;Faculty of Economics and MuamalatUniversiti Sains Islam Malaysia (USIM)This research aims at identifying the Islamic characteristic factors of Muslimpreneures in the business environment. The main sources of this study involve the adaptation characertistics of Muslim scholars in a business environment, including Quran, Hadith, narrations, academic study as well as other reliable sources. As such, this research is an attempt to explore the factors of Islamic characteristic elements of Muslimpreneurs, such as taqwa and planning, and it is hoped to contribute to the further development and understanding of this area in the humanities and social science fields. Moreover, the study will look at the objectives of Muslim entrepreneurs in Islam as part of fulfilling the duty of a vicegerent on earth, strengthening one�s relationship with Allah, finding truth and serving the society. The findings revealed that significant relationships exist between the state of taqwa and planning among Muslimpreneurs in relation to business performance. These findings provide a distinctive perspective on the concept of taqwa and proper planning and its necessity in the Islamic system for the contemporary modern era. In addition, it recommends to investigate the trend and profile of successful Muslimpreneurs and eventually develop global Muslimpreneurs. The outcomes and results of this study are then hoped to stimulate further improvements, advancements and research on the subject matter. � 2020, Hampstead Psychological Associates. All rights reserved. - Some of the metrics are blocked by yourconsent settings
Publication A review relations of optical tomography and optical coherance tomography(Penerbit UTM Press, 2015) ;Rahman N.A.A. ;Hong L.E. ;Rahim R.H.A. ;Yunus M.A.M. ;Wahab N.A. ;Ahmad N. ;Wahab A.R. ;Jumaah M.F. ;Hong L.E. ;Jamaludin J. ;Loon G.C. ;San C.K. ;Universiti Teknologi Malaysia (UTM) ;Institut Latihan Perindustrian Bukit katil ;I-Stone Technology Sdn. BhdUniversiti Sains Islam Malaysia (USIM)Optical Tomography (OT) is a form of computed tomography using a digital model of the volume of an object by reconstructing an image of the light transmitted and scattered by the object. OT is used mostly as a form of research in medical imaging. OT depends on the reference object being at least partially light transmitting or translucent, so it works best on soft tissue, such as breast and brain tissue. Optical Coherence Tomography (OCT) is a new technology for performing high-resolution cross-sectional imaging. OCT is similar to ultrasound imaging, but uses different types of light instead of sound. OCT can provide cross-sectional images of tissue structure on the micrometer scale and in real time. OCT serves as a kind of optical biopsy and is used as a medical diagnostic imaging technology because, unlike conventional histopathology, it does not require the removal and processing of tissue specimens for microscopic examination. The study was carried out to see how the two types of optical imaging and the use of concepts and components used in the system. The light source is used to show different levels of penetration and resolution for both methods is used. The use of an interferometer in optical imaging applications is discussed along with examples of commonly used methods. The optical imaging method contributes significantly to the diversity of tomography systems. � 2015 Penerbit UTM Press. All rights reserved. - Some of the metrics are blocked by yourconsent settings
Publication A systematic review on the beneficial effect of date palm (Phoenix dactylifera) consumption on energy metabolism(American Scientific Publishers, 2017) ;Wahab N.A. ;Zulkifli N.F. ;Shamaan N.A. ;Hamid N.A. ;Zahir N.N.M. ;Faculty of Medicine and Health SciencesUniversiti Sains Islam Malaysia (USIM)Phoenix dactylifera (date palm) produces edible, sweet fruits. The fruits has been mentioned multiple times in Quran as a super food, for its nutritious and numerous medicinal properties. Phoenix dactylifera fruit has been served as a staple food for millions of people around the world since ancient times. Despite the availability of reports on Phoenix dactylifera fruit, robust documentation regarding energy metabolism of dates is still inadequate. Consequently, date palm is hardly recognized as an energy rich food. This systematic review aims to study the beneficial effects of Phoenix dactylifera fruits and its components on energy metabolism in vivo. Published relevant articles were searched in four electronically indexed databases-Science Direct, Ebscohost, Biomed Central, and PubMed without any language or publication status restriction from January 1997 to 2015. Bibliographies of screened studies, relevant reviews and manuscripts were also searched using Google Scholar. Data were reported in the form of a descriptive summary followed by systematic reviews, according to the PRISMA guidelines. There were only three articles included in the qualitative synthesis and discussed the effects of Phoenix dactylifera on energy metabolism. All articles focused on animal studies. This systematic review identified several articles that reported the effect of Phoenix dactylifera on the energy content. Date palm pulp was reported to contain high valuable nutritive values and can be a potential animal feed. Phoenix dactylifera was also shown to have similar energy content compared to a standard animal feed (corn grain) therefore, it also can be an alternative energy source for livestock. The study reported on energy mechanism pathways of Phoenix dactylifera remained inconclusive. In addition, there are still gaps. Hence, further studies are required to provide a comprehensive understanding on this matter. � 2017 American Scientific Publishers All rights reserved.