bluuebunny/crossref_metadata_2025_split huggingface dataset:
Surface Physicochemical Modification of Kenaf Adsorbent for Hydrogen Adsorption Study
Authors: Ezaty S N , Zaini B N , Tsuji T , Jamalullail Putra Albaraqbah W , Mohd Sahri D , Alias N , Shafei N S 
Published: March 2021

Abstract
In supporting the industrial kenaf plan developed by Malaysian government, this research has extended the use of kenaf as a sorbent to investigate its reliability for hydrogen adsorption system. In satisfying the objective, the effect of impregnation time and the effect of nickel nitrate concentration on hydrogen adsorption has been studied. In addition, to study the adsorption and desorption capability of the modified kenaf on hydrogen adsorption, the regeneration study was also accounted. The kenaf core with the range of particle size in between 300-500µm has been modified through the physicochemical modification by experiencing the carbonization and activation process prior to be impregnated in nickel nitrate solution (Ni(NO3)2). The morphological and elemental studies on the modified-kenaf sorbent have been done with the helped of Variable Pressure Scanning Electron Microscopy (VPSEM) and Energy Dispersive X-Ray (EDX) analyser, respectively. The hydrogen adsorption using the hydrogen adsorption system was controlled at the pressure of 5 bar. The results show that the modified-kenaf sorbent able to improve the hydrogen adsorption as compared to the unmodified-kenaf sorbent. Based on the morphological analysis, the modified-kenaf sorbent contain more micropores compares to the unmodified-kenaf sorbent which help in the adsorption capacity. Besides, the modified-kenaf sorbent has potential to be reused with minimum pressure drop of only 0.207 and 0.109 bar up to second regeneration cycles. This study has revealed that the modified-kenaf material has high capability to be used as hydrogen adsorbent and can be competitive technology over the existing current hydrogen storage technology.
Mix Design of High-Strength Concrete Incorporating Spherical and Crushed CRT Funnel Glass Waste
Authors: Pauzi N N M , Sadeghifam A N , Zain M F M 
Published: March 2021

Abstract
Cathode ray tube (CRT) funnel glass, due to its high content of lead oxide (PbO), is considered as hazardous waste. The growing volume of the disposed CRTs technology presents a risk of environmental contamination owing to the potential of toxic Pb metals leaching from glass. A typical way of recycling CRT funnel glass waste is by crushing it and partially replaced the cement and fine aggregates. However, this approach has been facing serious issues in terms of leaching of Pb. Hence, a new recycling method has been developed, that is by performing proper melting and annealing operations in producing the spherical CRT funnel glass (GS). GS does not show any harmful risk of the release of Pb to the environment. The Pb leaching value of CRT concrete specimens with GS is significantly lower than the allowable limit although it contains high concentration of PbO, 25%. While the performance of GS in leaching aspects have been determined, the optimum mix designs of high-strength concrete incorporating both GS and crushed CRT funnel glass (GC) as coarse aggregates yet remains to be investigated. Predominantly to provide a safe method of recycling CRT funnel glass as aggregate and to increase the confidence level of the industries, this paper addresses the mix design of high-strength concrete with GS and GC as coarse aggregates. Given the importance of selecting the materials and its contents, the influence of five parameters, i.e. water/binder (w/b) ratio, coarse aggregate (CA) content, superplasticizers (SP) dosage, and silica fume (SF) content were evaluated. It was found that the incorporating of GS and GC that differ in terms of morphologies (size, shape, texture) and water absorption rate than the natural rock have led to the increase of workability of CRT concrete mixtures, however, decrease the compressive strength. But the results also have highlighted that the CRT specimens that were designed with w/b ratio 0.31, 43% content of CA, 2% SP, and 10% SF were able to achieve the highest strength of 61 MPa, which was only 9% lower than control specimens. The optimum mix design of CRT concrete has greatly improved the strength of concrete and enhance its potential for future applications.
Predictive Growth Model of Indigenous Green Microalgae (Scenedesmus sp. UKM9) in Palm Oil Mill Effluent (POME)
Authors: Mohd N , Yasin N H M , Takriff M S 
Published: March 2021

Abstract
Microalgae cultivation in POME treatment to removed environmental pollutants synchronized with biomass production. Biomass production depends on the proliferation rate of microalgae in wastewater, which is rarely addressed. Thus, growth rate assessment was performed on a local strain of Scenedesmus sp. UKM9 by using four different mathematical models of logistic, modified logistic, modified Gompertz, and Baranyi-Roberts. Statistical analyses, including root-mean-square error (RMSE), R2, adjusted R2, bias factor (BF), accuracy factor (AF), and standard error prediction (%SEP) were applied to verify the accuracy of each model. The findings illustrated that the Baranyi-Roberts model had the highest AF of 1.000, the lowest RMSE and %SEP values of 0.1300 and 5.40%, respectively, and the predicted BF value was 1.0001. These results revealed that the model was relevant to complex environmental conditions, and its parameter was biologically interpretable. The Baranyi-Roberts model regards a suitable model for the growth of indigenous microalgae of Scenedesmus sp. UKM9 in POME.
Electrochemical Treatment of Palm Oil Mill Effluent using Graphite as Electrode Materials
Authors: Rakhmania  , Yuzir M A , Al-Qaim F F 
Published: March 2021

AbstractPalm oil mill effluent (POME) is one of the largest wastes produced by palm oil industries. The electrochemical process offers an alternative to treat POME with several advantages. Anodic oxidation as one of the mechanisms from the electrochemical process has high efficacy to oxidize the organic content. This oxidation ability depends on electrode materials. In this study, graphite was used as electrode materials. The effects of voltage, electrolysis time and electrolyte support was investigated. The results show the highest removal efficiency obtained were 71% of COD reduction and complete color removal at optimum condition. Using graphite as an electrode was found efficient compared to other traditional materials and capable to reduce time the POME treatment compared to conventional methods.
Variation of Green Synthesis Techniques in Fabrication of Zinc Oxide Nanoparticles – A Mini Review
Authors: Mohamed Isa E D , Shameli K , Che Jusoh N W , Mohamad Sukri S N A , Ismail N A 
Published: March 2021

Abstract
The field of nanotechnology has been one of the major focus of research for scientists across the world. This field deals with the production and usage of nanoscale materials. The popularity of nanotechnology is due to its unique properties that cannot be found in its large counterpart. In these recent years, zinc oxide nanoparticles (ZnO NPs) emerged as an important ceramic material that can be utilized across various fields such as medicine, cosmetics, textiles, wastewater treatment and many others. The fabrication of ZnO NPs can proceed through three major pathways which are physical, chemical and green synthesis. Among these synthesis method, green synthesis is preferable as it is more environmentally friendly. In this review, we summarize the various techniques of green synthesis in fabrication of ZnO NPs.
Green Synthesis of Zinc Oxide-Based Nanomaterials for Photocatalytic Studies: A Mini Review
Authors: Mohamad Sukri S N A , Shameli K , Mohamed Isa E D , Ismail N A 
Published: March 2021

Abstract
Due to rapid industrialization, wastewater pollution has become a serious concern that needs to be addressed effectively. Untreated contaminants abundantly discharged into the water bodies have been proven to negatively impact the environment as well as human health. For a long time, zinc oxide (ZnO) has been used to treat these environmental pollutions in a process called semiconductor photocatalysis. In the field of material science, nanosized ZnO synthesized using green route has been used by many researchers as they are usually eco-friendly and cost effective. Even though ZnO nanostructures act as an excellent photocatalyst, there are still a few drawbacks that can limit their efficiency. To overcome these problems, ZnO modifications can be done to produce ZnO-based nanomaterials. In this mini review, we present up-to-date research progress on green synthesized ZnO-based nanomaterials and discusses on the methods used to modify ZnO nanostructures to improve photocatalytic efficiency.
Malaysian Medicinal Plant and Their Potential as Novel Anti-Arthritic Substances
Authors: Abdul Aziz Z A , Mohd Setapar S H , Nasir H M 
Published: March 2021

Abstract
Rheumatoid Arthritis is an autoimmune disease that leads to bone and joint destruction. Statistic showed that rheumatoid arthritis can be suffered by at least 1% of adult population globally. It possesses to significant disability and consequent reduction in quality of life that contribute to substantial socio-economic impact. Current treatment is involving the prescriptions of many steroids, non-steroidal anti-inflammatory drugs (NSAIDs), anti-cytokines and anti-rheumatic drugs. However, the major challenges of these drugs are poor bioavailabity with potent to possess several adverse reactions such as gastrointestinal, cardiovascular disorders, stroke, kidney failures and costly. Therefore, scientific committees suggest medicinal plants extract need to be taken into consideration which most research studies reported for their anti-inflammatory, analgesic and anti-oxidant activities with minimum side effects, which has high potential to be used in arthritis treatment. In Malaysia, almost 2000 medicinal plant species are reported to promote several health benefits. Based on research studies, some medicinal plants possess potential bioactive compounds with the activity related to the various inflammation diseases, including arthritis. Therefore, this review focuses on Malaysian plant extracts with high therapeutic potential for the future development of novel anti-arthritic drugs. There are 5 Malaysian medicinal plants have been reviewed and all plants showed interesting anti-arthritic activities by reduced pro-inflammatory cytokines and enzymes that resulted into inhibitory arthritis manifestation that comparable to positive control group. All reviews concluded that natural active constituents contained inside the extracts as the main cause of successful anti-arthritic potential of each Malaysian medicinal plant.
Evaluation of Henry Constant for Gas / Gas Mixture in Pure and Solvent Mixture Using Simple Functional Mixing Rule
Authors: Lai A J X , Basha A N , Tan L S , Tsuji T , Hoshina T , Funazukuri T , Bharath R 
Published: March 2021

Abstract
Some mixing rules were proposed with simple functional form to predict binary gas mixture solubility in pure solvent/pure gas solubility in binary solvent mixture. The experimental data employed were those of Tsuji et al. (2019) for equimolar binary gas mixture (nitrogen (N2) + oxygen (O2)) solubility in styrene at 303 K, and of Tsuji et al. (2005) for hydrogen (H2) solubility in equimolar mixture of benzene + cyclohexane at 303 K. These solubilities have a linear pressure dependence like Henry’s law at least up to 4.827 MPa. To predict gas solubilities, the mixing rules were proposed for Henry constant of gas mixtures in pure solvent and that of pure gas in solvent mixture just by using Henry constant of pure gas in pure solvent without any binary parameter. The function form was similar to that of van der Waals one fluid model, Q = ∑i ∑j
zi
zj
Q
ij for the mole ratio of constituent of gas or solvent mixture, zi. The Q = H and Q

ij
= (H

i
+ H

j
)/2 show the best reproducibility for (N2 + O2) solubility in styrene with average absolute relative deviation (AARD) 0.667 %. Otherwise, the Q = 1/H and Q

ij
= (1/H

i
+ 1/H

j
)/2 show the best reproducibility for H2 solubility in benzene + cyclohexane with AARD 5.605 %. The results were well described by a universality of physical properties and Lorentz-Berthelot theorem.
Materials Characterisation and Fracture Mechanism of Recycled Aluminium Alloy AA6061 Reinforced with Alumina Oxide
Authors: Issek M L , Mohd Nor M K , Ho C S , Lajis M A 
Published: March 2021

Abstract
This manuscript characterises the tensile behaviour and fracture mechanism of recycled aluminium alloy AA6061 reinforced with alumina oxide undergoing finite strain deformation of a uniaxial tensile test. The tests are conducted at three different strain rates of 6×10−3s−1, 6×10−2s−1, and 6×10−1s−1, at room temperature. The specimens are primarily examined in terms of stress-strain curves and microstructural analysis. The stress strain curve analysis is compared with the primary aluminium alloy AA6061. In general, the flow stress of both materials increases with increasing strain rate. The microstructures are investigated using Field-Emission Scanning Electron Microscopy (FESEM). The analysis on the deformed specimens showed that the deformation is driven by a ductile fracture mechanism via voids nucleation, and sensitive to the strain rate changes. The results of this work provide valuable information to improve the existing recycling process before an appropriate engineering application can be established in relevant areas.
Inventory model for multi-perishable goods with limited storage capacity
Authors: Afiffi F F , Arvitrida N I 
Published: March 2021

Abstract
The warehouse has an important role, namely storing finished products as well as semi-finished, especially in the Agrifood Supply Chain (ASC) which has special characteristics such as limited shelf life, changing variations in demand and prices that can be adjusted to make ASC look more complex and more difficult than other supply chains. In this study, various thoughts are offered to fit the real conditions. Stochastic demand distribution, the presence of constant lead time on each product, exponential decay rates, to limited storage space capacity. Related to this assumption, the ongoing review (Q, r) is aimed at supply policies that are relevant to the agricultural-food supply chain problem. The development of a mathematical model with decision variables Q and r to minimize costs on warehouse procurement is then analyzed using a comparison using parameter ordering costs, storage costs, and shortage costs that have been determined in this study. on items with limited warehouse capacity. In previous research, the process of storing and procuring multi-products did not contain short-lived products. Also, other studies also explain the storage of products in a short shelf life does not contain a shortage of limited storage capacity. It can be done on research that will be carried out adjusted to conditions that occur in the real world It is estimated that it will make a practical contribution and be a reference model of inventory policies for warehouses that have relevant requirements.
The expired period of Liquefied Petroleum Gas (LPG) rubber hose supports consumer safety aspects
Authors: Mulyono A B , Purwanto E H 
Published: March 2021

Abstract
Liquefied Petroleum Gas (LPG) rubber hose has the corrosive characteristic with hydrocarbon compounds (butane and propane). This makes LPG rubber hose has an expired period. Standards or technical specifications are needed to guarantee the quality of the product and increasing product safety. Until now, the expired period of LPG hose has not been regulated in the Indonesian National Standard (SNI). This study aims to analyse expired period of LPG rubber hose for gas stoves. In this study, the descriptive qualitative method is used based on primary data (questionnaire and interview) and secondary data (literature study). The result of this study concluded that the determination of LPG rubber hose expired period based on shelf life and service life. The service life of rubber hose will vary due to different raw materials, additives, and usage conditions (time, temperature, pressure, and environment). Seventy-five percent (75%) of LPG rubber hose industry respondents conducted research on LPG rubber hoses service life and recommended service life period is one year.
Optimization in job shop scheduling problem using Genetic Algorithm (study case in furniture industry)
Authors: Aquinaldo S L , Cucuk N R , Yuniaristanto  
Published: March 2021

Abstract
Job shop scheduling problem belongs to a class of NP-Hard problems. We solve a scheduling problem in a job shop based furniture company. The company produces several products such as chair, table, home decorations, and home accessories. Currently, the company schedules the order using Earliest Due Date (EDD) and First Come First Serve (FCFS) methods. The best schedule resulted from those methods is then chosen and used as the initial solution for Genetic Algorithm (GA) method. The proposed algorithm is implemented in MATLAB 2019a to minimize the makespan. Parameters used in the GA formation of new generations are done by crossover using the Precedence Preservative Crossover (PPX) method and mutations using job-pair exchange mutations. The selection of chromosomes for regeneration in the crossover process is chosen by two chromosomes that have the best fitness and for the mutation process, one chromosome that has the worst fitness is chosen. Solution from genetic algorithm is better than EDD for the case study. From the results, GA produces shorter makespan compared to EDD and FCFS methods. The EDD method gives a makespan of 104,280 minutes and the FCFS method gives a makespan of 118,440 minutes, while GA provides a makespan of 81,780 minutes.
Efficiency measurements of Diponegoro University faculty using the Data Envelopment Analysis hierarchical network model
Authors: Hendrawan B M , Purwanggono B , Suliantoro H 
Published: March 2021

Abstract
Diponegoro University (UNDIP) is a state university located in Semarang city. UNDIP is aiming to become a world-class university. To become a world-class university, UNDIP has to maintain its quality in academic, research, and community service. But UNDIP was facing some challenges, like has to compete with other universities that growing rapidly. To achieve the target, the efficiency of every faculty in UNDIP should be continuously monitored and improved. Measuring the overall efficiency of every faculty is the aim of this research. The samples used in this research were all faculty of undergraduate programs in UNDIP. The hierarchical network data envelopment analysis model measuring the efficiency level of every faculty at UNDIP for systems with a hierarchical structure. In this research, the input variables used were the number of lecturers, the number of students, and amount of operational expenses. While the output variables were the number of graduates, the number of researches, the number of publications, the number of researches, the number of guidance & consultation, and the number of activities. The results of this study would help the management of university especially the dean of faculty to identify the inefficiency at every faculty in UNDIP and then plan for improvement.
Supply-demand optimization in the product distribution process through the branching method
Authors: Lukitosari V , Subriadi A P 
Published: March 2021

Abstract
Interaction and relationship between seller-buyer for the availability of certain products always involve the distribution process from suppliers to a number of customers so that demand at each destination is fulfilled. If the product cannot be fulfilled, the customer will find another supplier to meet the product’s shortcomings. Thus the supplier is trying to prevent the supply of other competitors of the same type. Effective logistical arrangements in the distribution of goods need to pay attention to the behavior characteristics of shipping costs. The purpose of this study is to minimize shipping costs with a distribution scheme that can optimize product loads. By using the Balinski linear approach, the problem of sending fixed costs can be solved by the branching method. The branching method gradually produces new problem-solving branches with different objective functions and constraints. Each value branch could be compared so that the optimal solution for the cost is found.
Proposing predictive maintenance strategy to increase OEE through system upgrade scenarios and AHP
Authors: Prasetyawan Y , Rachmayanti I 
Published: March 2021

Abstract
Maximizing the value of OEE is a crucial thing to do for a company in order to increase their productivity. OEE is one of the most common technique to measure equipment’s effectiveness. To enhance the number of OEE, it is very important to do a maintenance task to keep the equipment in a good condition. Predictive maintenance task is one of the maintenance strategies to see any potential failure in an equipment and do a preventive way to prevent it from a total stop/break down. As a result, understanding the needs to do a maintenance upgrades for better performance and proposing a good predictive maintenance strategy will enhance the value of OEE and result in cost savings. The objective of this paper is to propose the necessary predictive maintenance task using analytical hierarchy process (AHP) using three respondents to decide the AHP process and consistency ratio to get the most suitable maintenance task for fertilizer company as small medium enterprise.
Workload analysis using Modified Full Time Equivalent (M-FTE) and NASA-TLX methods to optimize engineer headcount in the engineering services department
Authors: Rachmuddin Y , Dewi D S , Dewi R S 
Published: March 2021

Abstract
With the increasing number of project initiatives, requests for engineering technical assistance are also increased. This raises a problem in the Engineering Services department which is uneven project workloads assigned among engineers, while there are no standard tools yet used to calculate accurate workload. To achieve maximum engineering productivity and performance, this study conducted to calculate engineer’s physical and mental workload. To calculate physical workload, the modified Full Time Equivalent (M-FTE) method is used, where engineer’s performance rating and allowance factors are also used to combine with the basic FTE calculation method. Estimate hours divided according to project’s level of complexity are converted into an index of FTE categories, i.e. underload, normal, and overloaded. The NASA-TLX method is used to get mental workload subjectively based on the average weight rating of six indicators. FTE index result shows adequate number of electrical engineers where half of them can still be assign to new project, while most of the instrument engineers already overloaded. Engineer’s mental workload from NASA-TLX result shows an average WWL (Weighted Workload) up to 81.72, which categorized as ‘Very High’ and corresponds to the nature of projects that always expected to be on schedule with high quality result.