Matrimid-based carbon tubular membrane: Effect of carbonization environment

N. Sazali,W.N.W. Salleh,N.A.H.M. Nordin,A. F. ISMAIL 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.32 No.-

Among gas separation materials, carbon membrane exhibits the most interesting performance in termsof selectivity, stability, and gas permeance. By controlling and optimizing carbonization environment,excellent gas separation performances can be achieved. In this study, tubular supported carbonmembrane was prepared using Matrimid as polymeric precursor. In order to produce high performancecarbon membrane, the effect of carbonization conditions on the gas permeation properties wasinvestigated. The polymer solution was coated on the surface of the tubular support by using dip-coatingmethod. Carbon membranes were fabricated by heat treatment process under controlled carbonizationenvironments; Ar or N2. Pure gas permeation tests were performed using CO2, CH4, and N2 at roomtemperature with pressure 8 bar. Based on the results, the highest CO2/CH4 and selectivity of 87.34 andCO2/N2 selectivity of 79.60 were obtained by carbon membrane carbonized under Ar gas. Despite thehigher carbonization temperature, the carbonization under Ar created more permeable pores ascompared to N2 environment.

Genome-wide profiles of H2AX and H2AX differentiate endogenous and exogenous DNA damage hotspots in human cells

Seo, J.,Kim, S.C.,Lee, H.-S.,Kim, J.K.,Shon, H.J.,Salleh, N.L.M.,Desai, K.V.,Lee, J.H.,Kang, E.-S.,Kim, J.S. Oxford University Press 2012 Nucleic acids research Vol.40 No.13

A Perspective of Malaysian Marine Training Providers and Shipowners on Communication Issues Onboard Merchant Vessels

N. H. M. SALLEH,N. A. ALIAS,J. JEEVAN,R. M. HANAFIAH,A. H. NGAH 국제이네비해양경제학회 2019 International Journal of e-Navigation and Maritime Vol.11 No.1

The IMO Standard Marine Communication Phrases (SMCP) has been established purposely to enhance the greater safety of vessel’s navigation by standardizing the language used among seafarers. However, accidents are still occurred due to communication failures among onboard merchant vessels’ crews. It is worth mentioning that the major cause of marine accidents is human error (80%) where one-third from it was due to communication failures. Ineffective communication, different culture and language among seafarers onboard are some instigators of human error that lead to accidents in marine operations. Therefore, the primary aim of this paper is to investigate and evaluate the causal factors that contributes to communication failures onboard merchant vessels. Then, this paper recommends possible solutions for minimizing the communication failures among seafarers. To achieve this research objectives, two decision-making tools which are the Analytical Hierarchy Process (AHP) and Evidential Reasoning (ER) was applied. Data and judgments are obtained from domains experts from four marine training providers and eight shipowners in Malaysia. The result has shown that lack of SMCP knowledge, prejudice and dialect varieties are the most significant factors that contribute to the communication failures onboard merchant vessels. Few suggestions and opinions from the experts are proposed in this paper. This research can assist marine training providers and shipowners to identify and evaluate the causal factors of communication failures thus corrective action can be taken.

Tailoring the properties of polyamide thin film membrane with layered double hydroxide nanoclay for enhancement in water separation

Tajuddin M.H.,Yusof N.,Fajrina N.,Salleh W.N.W.,Ismail A.F.,Jaafar J.,Aziz F. 한국물리학회 2022 Current Applied Physics Vol.34 No.-

This current paper presented a new candidate and potentially to improve the current membrane materials in water filtration process. With that, the primary materials used in this research study is layered double hydroxides (LDH) nanoclay which can be obtained from earth minerals and self-synthesized from inorganic salts were discussed thoroughly to help a better understanding of these materials. However, the current technologies of water separation were still lagging behind and ineffective especially in removal of divalent metal ions and multivalent salts. Infeasibility of reverse osmosis membrane make it not a viable option for divalent salts filtration. With that, nanofiltration (NF) membrane offered as an alternative to substitute available method. In this study, thin film nanocomposite (TFN) membranes were fabricated by incorporating layered double hydroxides (LDH) nanoclay. The LDH nanoclay with different loading ratio of 0, 0.05, 0.1, 0.15 and 0.2 were impregnated into polyamide layer on top of polysulfone substrates. The fabricated TFN were characterized in terms of physicochemical properties (SEM and FTIR) and membrane hydrophilicity (contact angle). After the addition of LDH, the morphological structures of TFN membranes were changed and the surface hydrophilicity was enhanced significantly. FESEM images displayed a typical ridge and valley morphology with nodule-like structures. As the LDH loading was increased, the contact angle decreased from 34.56◦ to 15.76◦ showing the surface hydrophilicity of membrane is improved. The separation performance of membrane was evaluated in terms of salt rejection ability by cross flow filtration system. The best performance NF membrane was found to be TFN 0.05 with high water flux and MgCl2 rejection with values of 24.18 L/m2.h and 91% respectively. This study has experimentally validated the potential of LDH materials in membrane process for improvement in water separation process.

Willingness to pay for Halal transportation cost: The Stimulus-organism-response model

A. H. NGAH,HD KIM,R.M.HANAFIAH,N. H. M. SALLEH,J. JEEVAN,N.M. ASRI 국제이네비해양경제학회 2019 International Journal of e-Navigation and Maritime Vol.12 No.1

Halal transportations will ensure that the Halal status of the products will be preserved. Halal certification is believed to increase the operation cost for the transport providers, which reflect the price paid by customers who choose to buy products transported by Halal transportation. Hence, it is worthwhile to investigate the willingness of Muslim consumers to pay extra for the Halal transportation cost. The study aims to identify factors influencing Muslim consumers’ attitude towards their willingness to pay for Halal transportation. Using the stimulus-organism-response model, attitude which represents the organism factor will be treated as a mediator for variables representing the stimulus factors and the variable for the response. On the other hand, the study will also examine the effect of knowledge as a moderating factor. The data was collected from Muslim consumers in Kuala Lumpur. Applying the purposive sampling method with a self-administered survey, 202 respondents agreed to participate in the study. The findings revealed that awareness and perceived behavioural control are a stimulus towards attitude, and attitude is a significant organism on willingness to pay. The study also found that attitude mediates the relationship between awareness and perceived behavioural control towards the willingness to pay for Halal transportation. Additionally, the knowledge has a moderating effect of the relationship between attitude and the willingness to pay. The findings of the study are not only beneficial for the Muslim community in Malaysia, but also the Muslims around the world.

Synthesis and Characterisation of Dual Z-Scheme V2O5/g-C3N4 Photocatalysts for Degrading Ciprofloxacin Antibiotics Under Visible Light

Sohaimi Khairunissa Syairah Ahmad,Jaafar Juhana,Dharma Hadi Nugraha Cipta,Samuel Ojo,Ismail A. F.,Othman M. H. D.,Rahman Mukhlis A.,Aziz F.,Salleh W. N. W. 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.3

In this research, an innovative Z-scheme vanadium pentoxide (V 2 O 5 )/graphitic carbon nitride (g-C 3 N 4 ) photocatalyst was synthesised using a facile thermal treatment method, and its photodegradation performance and physicochemical properties were evaluated. The heterostructure provided high Brunauer–Emmett–Teller surface area and pore volume, which encouraged charge carrier separation and transfer, as well as supplied abundant micro-mesoporous structures and active sites for photocatalytic redox reactions. The successful incorporation of V 2 O 5 between g-C 3 N 4 layers can be proven by proposing the synthesis mechanism, as well as conducting morphology, crystal structure, elemental, and chemical analysis through scanning electron microscopy, X-ray diff raction, energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy, respectively. Using these combined photocatalysts, ciprofl oxacin (CIP) was successfully degraded up to 90.17% removal effi ciency in the visible-light spectrum. The superior photocatalytic activity of g-C 3 N 4 composite over V 2 O 5 is primarily due to its increased light absorption capacity, as well as increased surface area, pore size, and volume, eff ective charge transfer, and optimal band alignment between g-C 3 N 4 and V 2 O 5 . This research provides a signifi cant future perspective for the utilisation of Z-scheme V 2 O 5 /g-C 3 N 4 heterojunction photocatalyst for water treatment, especially those involving endocrine-disrupting compounds and antibiotics like CIP.

Health and Safety: Fatigue among Seafarers in Malaysia

FIRDAUS NOR,SITI MARSILA MHD RUSLAN,KASYPI MOKHTAR,N.H.M. SALLEH,J. JEEVAN,A. H. NGAH,R. M. HANAFIAH 국제이네비해양경제학회 2019 International Journal of e-Navigation and Maritime Vol.12 No.1

Fatigue is not a trivial issue and needs much attention. On the other hand, fatigue among seafarers could lead to accidents at sea due to their inability and ineffectiveness in carrying out their work. Some were caused by sleepiness and lack of vigour, which, could not only affect their safety but compromising on other seafarers as well. In this study, factors that cause fatigue among seafarers were examined analytically and their quantitative priorities were determined using Analytic Hierarchy Process (AHP) method. Additionally, the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) is used to identify the best alternatives in minimizing fatigue among seafarers. For this, data is collected through interview involving those working in academic and maritime industry with more than 5 years of experiences in dealing with seafarers. The AHP result shows that fitness is the main cause that could affect fatigue on seafarers’ reliability. Besides, TOPSIS result shows that a well-maintained shipboard is the best way in sustaining seafarers’ energy. In sum, fatigue among seafarers could influence on safety and may lead towards precarious health issue over a long-term.