Showing papers by "Universiti Teknologi Petronas published in 2018"
10 Jul 2018
TL;DR: The IDRiD (Indian Diabetic Retinopathy Image Dataset), is the first database representative of an Indian population and makes it perfect for development and evaluation of image analysis algorithms for early detection of diabetic retinopathy.
Abstract: Diabetic Retinopathy is the most prevalent cause of avoidable vision impairment, mainly affecting the working-age population in the world Recent research has given a better understanding of the requirement in clinical eye care practice to identify better and cheaper ways of identification, management, diagnosis and treatment of retinal disease The importance of diabetic retinopathy screening programs and difficulty in achieving reliable early diagnosis of diabetic retinopathy at a reasonable cost needs attention to develop computer-aided diagnosis tool Computer-aided disease diagnosis in retinal image analysis could ease mass screening of populations with diabetes mellitus and help clinicians in utilizing their time more efficiently The recent technological advances in computing power, communication systems, and machine learning techniques provide opportunities to the biomedical engineers and computer scientists to meet the requirements of clinical practice Diverse and representative retinal image sets are essential for developing and testing digital screening programs and the automated algorithms at their core To the best of our knowledge, IDRiD (Indian Diabetic Retinopathy Image Dataset), is the first database representative of an Indian population It constitutes typical diabetic retinopathy lesions and normal retinal structures annotated at a pixel level The dataset provides information on the disease severity of diabetic retinopathy, and diabetic macular edema for each image This makes it perfect for development and evaluation of image analysis algorithms for early detection of diabetic retinopathy
486 citations
TL;DR: In this paper, the impact of three major strategies for peak load shaving, namely demand side management (DSM), integration of energy storage system (ESS), and integration of electric vehicle (EV) to the grid has been discussed in detail.
Abstract: In this study, a significant literature review on peak load shaving strategies has been presented. The impact of three major strategies for peak load shaving, namely demand side management (DSM), integration of energy storage system (ESS), and integration of electric vehicle (EV) to the grid has been discussed in detail. Discussion on possible challenges and future research directions for each type of the strategy has also been included in this review. For the energy storage system, different technologies used for peak load shaving purpose, which include their methods of operation and control have been elaborated further. Finally, the sizing of the ESS storage system is discussed. For the demand side management system, various management methods and challenges associated with DSM implementation have been thoroughly explained. A detailed discussion on the electric vehicle strategy has also been included in the review, which considers the integration, control and operation techniques for implementing the peak load shaving.
303 citations
TL;DR: In this article, the main challenges in photocatalytic CO2 reduction systems and strategies to improve the efficiency of solar fuels production were discussed. And the challenges lingering on against achieving the higher photocalytic conversion of CO2 into solar fuels are also investigated.
Abstract: The massive burning of fossil fuels to fulfill the augmenting energy demands of world have triggered the ever-increasing emission of carbon dioxide (CO2); the main cause of global warming. Photocatalytic reduction of CO2 into solar fuels and chemicals using everlasting solar energy seems promising technology to contemporaneously curb the globa1 warming and partially fulfill the energy requirements. This study focused on understanding the main challenges in photocatalytic CO2 reduction systems and strategies to improve the efficiency of solar fuels production. The overview of fundamentals and latest developments in titania (TiO2) based photocatalytic CO2 reduction systems have been discussed. More specifically, thermodynamics, mass transfer, selectivity and reaction mechanism of photocatalytic CO2 reduction are critically deliberated. In the main stream, developments have been categorized as strategies to enhance the different aspects such as visible light response, charge separation, CO2 adsorption and morphology of photo-catalysts for TiO2 based photocatalytic CO2 reduction systems. Different modification techniques to overcome the low efficiency by fabricating advance TiO2 nanocomposites through surface modifications, doping of metals, non-metals and semiconductor are discussed. The challenges lingering on against achieving the higher photocatalytic conversion of CO2 into solar fuels are also investigated. In conclusion, brief perspectives and recommendations on the development of efficient photocatalysts are outlined which would be of vital importance for the improvements of conversion efficiency of CO2 reduction system.
275 citations
TL;DR: Future research should focus on the enhancement of geopolymer performance, testing on pollutants other than heavy metals and dyes, and verification on real wastewater in continuous operation.
275 citations
TL;DR: A comprehensive overview of the progress made in the field of petroleum emulsions, principally the roles of particles in combination to asphaltene and resin in stabilizing water-in-oil (w/o)-emulsions is presented in this paper.
231 citations
TL;DR: The metal additive manufacturing (metal-AM) has undergone a remarkable evolution over the past three decades as mentioned in this paper, and it has moved into the mainstream of the industrialised field such as biomedicine.
231 citations
TL;DR: In this paper, the authors conducted a comprehensive review on current status of static stability experiments, macroscopic and microscopic scale experimental studies of nanoparticles-stabilized foam for enhanced oil recovery (EOR) applications.
210 citations
TL;DR: UHPC has several advantages over conventional concrete but the use of it is limited due to the high cost and limited design codes as discussed by the authors, however, it is the future material with the potential to be a viable solution for improving the sustainability of buildings and other infrastructure components.
195 citations
TL;DR: The purpose of the study is to analyze categorically recent advances through qualitative and segmentation methods allowing to reveal trends and areas of opportunity in the industry sense of 4.0 in order to obtain research gaps that may be executed in organizational systems on the value chain.
Abstract: The evolution of markets and customer requirements with highest level of precision, has been achieved created with technology and information systems, a new way of make the operations in the companies, and just the companies with the ability to adapt faster to technological innovations may remain on the market. The last industrial revolution, known as industry 4.0 perceives the operations as a holistic system, its represents a challenge that must be fulfilled and faced in order to achieve stability and permanence in the market, from the point of view of the world economies. In the organizational and business area all the operations must be linked to computer systems and management of information in the network, which causes greater efficiency in the flow. With this new perception of industry and the business, it involves different analytical tools that aim at bigger efficiency in the service to the consumers, resulting in a greater competitiveness in the market and making the differentiator. This work is one of the first surveys that provides an extensive analysis and review of 110 publications that appear from 1/01/12 to 20/02/17. The purpose of the study is to analyze categorically recent advances through qualitative and segmentation methods allowing to reveal trends and areas of opportunity in the industry sense of 4.0 in order to obtain research gaps that may be executed in organizational systems on the value chain. Another point is to be a reference in future research related to the categories selected in this study.
195 citations
TL;DR: In this article, the authors reveal in-depth analysis and discussions on the process of microalgae-based wastewater treatment as well as micro-algae cells disruption technology for lipid extraction.
187 citations
TL;DR: In this article, the authors focus on the nutritional aspects in enhancing the biomass and lipid yields from various microorganism feedstock, serving as impetuses for the production of third generation biofuels.
Abstract: The third generation biofuels derived from oleaginous microorganisms have gained traction recently as the potential feedstock in generating fuel for energy production, reducing the direct dependence on fossil fuels. However, commercialization of microbial technology for biofuel production remains intricate and questionable due to many factors concerning the life cycle assessment and techno-economic feasibility of microorganisms-based biofuels. This review initially focuses on the nutritional aspects in enhancing the biomass and lipid yields from various microorganism feedstock, serving as impetuses for the production of third generation biofuels. Nutrient optimizations in terms of nutrient starvation, supplementation and balancing technique are discussed in relation to their respective effects on the microbial biomass and lipid productions. More importantly, the economic perspectives of oleaginous microorganism cultivations are also reviewed and strategized using alternative and non-conventional nutrient sources for possible technology scale-ups and commercialization.
TL;DR: In this article, the authors investigated the behavior of operational time of heat sinks with respect to specific temperature both for charging and discharging, and showed that at the end of 90min charging, maximum temperature reduction of 25% is noted for RT-35HC/Copper foam at 0.8-2.4
TL;DR: The findings reveal the feasibility of AC-alginate beads composite to be used as a potential and low cost adsorbent for removal of cationic dyes.
TL;DR: In this paper, the thermolytic transformation of lignocellulosic spent coffee grounds to superior redox-active carbocatalyst (denoted as NBC) via nitrogen functionalization in a pyrolytic environment at various temperatures was investigated.
Abstract: The thermolytic transformation of lignocellulosic spent coffee grounds to superior redox-active carbocatalyst (denoted as NBC) via nitrogen functionalization in a pyrolytic environment at various temperatures was investigated. The intrinsic (e.g. surface chemistry, degree of graphitization, etc.) and extrinsic (e.g. specific surface area, morphology, etc.) properties of the catalysts were systematically studied using various characterization techniques. The three main N configurations conducive to redox reactions, namely pyrrolic N, pyridinic N and graphitic N were present at different compositions in all the NBCs prepared at pyrolysis temperature ≥500 °C. The NBCs were used as peroxymonosulfate (PMS) activator for degrading bisphenol A. It was found that NBC-1000 (prepared at 1000 °C) has the highest catalytic performance (kapp = 0.072 min−1) due to the relatively higher specific surface area (438 m2 g−1), excellent degree of graphitization, and optimum N bonding configuration ratio. Based on the radical scavenger and electron paramagnetic resonance studies, the nonradical pathway involving 1O2 generation is identified as the prevailing pathway while the radical pathway involving SO4 −and OH generation is the recessive pathway. Further investigation of the durability of surface active sites revealed that the active sites undergo N bonding configuration reconstruction and cannibalistic oxidation (increase in surface oxygen content) during PMS activation reaction. The graphitic N manifest greater catalytic activity and stability compared to pyridinic N and pyrrolic N under oxidizing environment. The results demonstrated that reaction optimization is critical to improve the durability of the catalyst. This study provides useful insights in converting lignocellulosic biomass waste into functional catalytic material, and the strategy to improve the durability of carbocatalysts for redox-based reactions.
01 Jan 2018
TL;DR: In this paper, the authors provide practical guidelines for researchers to successfully conceptualise, test and interpret mediation models and discourage researchers from using outdated mediation approaches in their theses/manuscripts.
Abstract: This editorial outlines and responds to some of the most frequently asked questions regarding mediation analysis. Specifically, six key issues are addressed with reference to the state-of-the-art mediation literature. In doing this, we provide practical guidelines for researchers to successfully conceptualise, test and interpret mediation models. Recent references are also provided to discourage researchers from using outdated mediation approaches in their theses/manuscripts. It is our hope that this effort will clarify misconceptions regarding mediation analysis and provide up-to-date guidelines for researchers to make informed decisions and conduct the analysis appropriately.
TL;DR: In this article, a review of organic, inorganic perovskite solar cells and the extent of fabrication techniques with a view to understand the material efficiency relationships is presented, which aims to represent an account of the advancement in the organic and inorganic solar cells.
Abstract: Perovskite hybrid solar cells are in vogue in solar cell research. Dye-sensitized solar (DSS) cells, thin film solar cell and silicon solar cell, among others, owing to their efficiencies that are comparable to crystalline Si solar cells and ease of fabrication by a low-temperature solution technique. Although perovskite solar cells have been accounted for to exhibit enhanced output of about 21% from about 9.7%, limited researches have been conducted to find out their low stability that impedes outdoor applications. The issue of degradation of perovskite and the stability of perovskite solar cells should be addressed for good reproducibility and long life time with high conversion efficiencies. The present review aims to represent an account of the advancement in the organic, inorganic perovskite solar cells and the extent of fabrication techniques with a view to understand the material efficiency relationships.
TL;DR: In this paper, the authors considered pyrolysis of high-ash sewage sludge (HASS) as an effective method and a promising way for energy production from solid waste of wastewater treatment facilities.
TL;DR: In this article, mixed matrix membranes (MMMs) were prepared using polydimethylsiloxane (PDMS) as a hydrophobic polymer and ZIF-67 as inorganic filler particle.
TL;DR: In this article, a roller compacted rubbercrete (RCR) was developed by partially replacing fine aggregate with crumb rubber (CR) in RCCP to improve its flexural resistance, ductile behavior and reduce the environmental effect of waste tires.
TL;DR: In this paper, the authors highlight the hydrogen production potential from biomass through gasification technology and review the parameters effect of hydrogen production such as temperature, pressure, biomass and agent ratio, equivalence ratios, bed material, gasifying agents and catalysts effect.
TL;DR: There is a need to embed ethical implication as a construct for user trust leading to user acceptance model in future studies, according to the researcher who proposes that ethical implication can be an important element of user trust toward autonomous technology.
Abstract: The autonomous vehicle innovation has a potential effect on traffic and it’s a widespread issue in the academic municipal. Based on its feature, autonomous vehicle is expected to improve traffic flow, reduce accidents, reduce social exclusion and improve the utility of time on travel. It is increasingly accepted that the next step to the evolution of human transportation is the replacement of human as the driver by the Artificial-intelligence-capable machine. Regardless, the challenges remain especially in convincing the consumers to switch to autonomous cars despite the apparent benefits. In the past, papers highlighted individual trust toward machine as the key point to encourage acceptance of autonomous cars. This paper seeks to highlight the ethical implications of the autonomous technology and how it is related to the user acceptance of the technology. This paper reviewed recent studies on the ethical implications of the autonomous vehicle and the user acceptance of the technology. A systematic review of papers from the literature was done using Scopus, ISI and Web of Science. The results of the review have shown that the level of trust, which may vary on the sociodemographic profile of the users, has been studied as one of the factors for user acceptance. Many researchers also highlight ethical implication as an important aspect of autonomous technology that needs to be tended to. The researcher proposes that ethical implication can be an important element of user trust toward autonomous technology. Hence, there is a need to embed ethical implication as a construct for user trust leading to user acceptance model in future studies. In the line of this research review researcher was addressed the following comprehensive groups: examination of autonomous vehicle topographies and flexibility prototypes, consequences for street traffic and connectivity to substructure (specifically in the urban areas with the medium and low density), communal attitudes and apprehensions, transportable behaviour and plea, possible business models, and strategy implications. Lastly, the main objective of this research article is to recognise critical problems for the growth of an effort cluster investigation to comprehend attitudes of possible manipulators of AVs and to highpoint autonomous vehicle growth issues for Malaysian lawful agencies.
TL;DR: In this paper, the effect of hybridization between hybridization fibres and thermoset polymer as reinforcement for energy absorption tube research and expected would provide an information and idea which to expend the knowledge in future study of the hybridization effect for EIB, moreover the development for future potential as new hybrid composite fiber materials from the natural/synthetic fibres reinforced composite material in employing of high-performance EIB application.
TL;DR: In this article, new types of MMMs are fabricated by incorporating NH2-MIL-53(Al) filler into cellulose acetate (CA) polymer, and the results showed that the presence of NH 2-Mil-53 (Al) in CA matrix had enhanced the CO2 permeability, CO2/N2 and CO 2/CH4 ideal selectivities from 15.5 Barrer to 52.6 Barrer, 8.8 to 23.4 and 10.7 to 28.7, respectively.
TL;DR: In this article, the authors reviewed the recent advances and prospects of the application of polymeric nanofluids in crucial aspects of EOR such as stability and adsorption, wettability alteration, interfacial tension reduction and emulsion stability, and rheology.
TL;DR: In this paper, the effects of pH, metal ions concentration, biosorbent dosages and contact time on the biosorption of selected metallic ions were studied, and it was shown that C. vulgaris in alginate beads constitute a favorable, effective, economical and biodegradable material for the removal of heavy metals pollution in the environment.
TL;DR: In this article, future energy security and environmental issues are major driving forces for increased biomass utilization globally and especially in developing countries like Pakistan, especially in the developing countries of South Asia.
Abstract: Future energy security and environmental issues are major driving forces for increased biomass utilization globally and especially in developing countries like Pakistan. For efficient utilization o ...
TL;DR: Among the synthesized ionic liquids, [C4(Mim)2][(2HSO4)(H2SO4)4] showed higher % yield of LA up to 47.52 from bamboo biomass at 110°C for 60min, which is the better yield at low temperature and short time compared to previous reports.
TL;DR: This paper reviews and critically analyzes the latest developments in the mathematical modeling and simulation techniques that have been reported for the characteristics and mechanisms of nutrient release from CRFs.
TL;DR: In this paper, a comprehensive review sheds light on the use of nanomaterial for gas hydrate promotion and relevant kinetic parameters, and also addresses the factors that might rule the performance of nanofluids as promoters.
TL;DR: A review of the available literature published to date on the reinforcement of metals with carbon-nanofillers (CNTs and graphene), and a specific focus on issues related to the mechanical and tribological properties of nanocomposites is presented in this article.
Abstract: This article reviews the available literature published to date on the reinforcement of metals with carbon-nanofillers (CNTs and graphene), and also offers a specific focus on issues related to the mechanical and tribological properties of nanocomposites. Carbon-nanofillers (later denoted by C-nanofillers) are known to have extraordinary mechanical properties and multifaceted characteristics and are ideal candidates for the reinforcement of metals for numerous applications. However, their incorporation for practical applications has been challenging researchers for decades. The most important issue is uniform dispersion due to sizeable surface differences between carbon-nanofillers and metals. Other concerns are structural integrity, wetting with metals, and interfacial connections. Nanocomposite applications can only be effective when these challenges are properly addressed and overcome.Section 1 assesses the importance of C-nanofillers and expressly highlights current research efforts to optimiz...