A closer look at the structure and gamma-ray shielding properties of newly designed boro -tellurite glasses reinforced by bismuth (III) oxide

Thabit Hammam Abdurabu,Ismail Abd Khamim,Yusof N.N.,Sayyed M.I.,Mahmoud K.G.,Abdullahi I.,Hashim S. 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.5

This work presents the synthesis and preparation of a new glass system described by the equation of (70- x) B2O3e5TeO2 e20SrCO3e5ZnO exBi2O3, x ¼ 0, 1, 5, 10, and 15 mol. %, using the melt quenching technique at a melting temperature of 1100 C. The photon-shielding characteristics mainly the linear attenuation coefficient (LAC) of the prepared glass samples were evaluated using Monte Carlo (MC) simulation N-particle transport code (MCNP-5) at gamma-ray energy extended from 59 keV to 1408 keV emitted by the radioisotopes Am-241, Ba-133, Cs-137, Co-60, Na-22, and Eu-152. Furthermore, we observed that the Bi2O3 content of the glasses had a significantly stronger impact on the LAC at 59 and 356 keV. The study of the lead equivalent thickness shows that the performance of fabricated glass sample with 15 mol.% of Bi2O3 is four times less than the performance of pure lead at low gamma photon energy while it is enhanced and became two times lower the perforce of pure lead at high energy. Therefore, the fabricated glasses special sample with 15 mol.% of Bi2O3 has good shielding properties in low, intermediate, and high energy intervals

Recent trends of heavy metal removal from water/wastewater by membrane technologies

N. Abdullah,N. Yusof,W.J. Lau,J. Jaafar,A.F. Ismail 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.76 No.-

A literature search revealed a lack of up-to-date and detailed review articles on the use of membranetechnologies for heavy metal removal. Thus, this article provides a comprehensive review of theperformance and capability of different membrane processes and discusses the advantages anddisadvantages of each. This review also discusses the technical challenges of existing membrane processand recommends future research to further enhance membrane performance and render it the bestalternative for treating water laden with heavy metals.

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.

RELATIONSHIP BETWEEN LEAN SIX SIGMA, ENVIRONMENTAL MANAGEMENT SYSTEMS, AND ORGANIZATIONAL PERFORMANCE IN THE MALAYSIAN AUTOMOTIVE INDUSTRY

N. F. HABIDIN,S. M. YUSOF 한국자동차공학회 2012 International journal of automotive technology Vol.13 No.7

In the globalization era, lean initiatives and environmental management systems are increasingly implemented in the automotive industry. The aim of this report is to investigate and perform structural analysis of Lean Six Sigma (LSS) and Organizational Performance (OP). Data were obtained from 252 top management leaders in the Malaysian automotive industry. This report presents the results of the Exploratory Factor Analyses (EFA), Confirmatory Factor Analysis (CFA), and reliability analysis, which are empirically verified and validated. A set of assessment measurements of LSS and OP is expected to be suitable for their characteristics and improve their competitiveness. Thus, the main objective of the analysis was to provide additional insight into the relationship between LSS and OP by examining the effects of ISO 14001 certification as a moderator. The results indicate that ISO 14001 certification does not significantly moderate the relationship between LSS and OP in the Malaysian automotive industry. However, the OP values for ISO 14001 certified companies are higher than those without ISO 14001 certification.

Optimization of Several Environmental Factors to Human Performance by Using Taguchi Method

Ismail, A.R.,Haniff, M.H.M.,Yusof, M.Y.M.,Rahman, M.N.A.,Ghani, J.A. Korean Institute of Industrial Engineers 2010 Industrial Engineeering & Management Systems Vol.9 No.2

The objective of this study is to determine the dominance effects of environmental factors such as Illuminance, humidity and Wet Bulb Globe Temperature (WBGT) on the operators' productivity at Malaysian electronic industry. A case study was carried out at an electronic components assembly factory. The environmental factors examined were the Illuminance (lux), humidity and WBGT of the surrounding workstation area. Two sets of representative data including the illuminance, humidity and WBGT level and production rate were collected during the study. The production rate data were collected through observations and survey questionnaires while the illuminance level was measured using photometer model RS 180-7133, the humidity and WBGT level were measured by using Quest Temp apparatus and humidity. Taguchi Method was utilized to find the sequence of dominant factors that contributed to the productivity of operator at that specified production workstation. The study reveals that the dominant factor contributed to the productivity was WBGT, followed by illuminance and humidity.

Cryptography: A New Approach of Classical Hill Cipher

M. Nordin A. Rahman,A. F. A. Abidin,Mohd Kamir Yusof,N. S. M. Usop 보안공학연구지원센터 2013 International Journal of Security and Its Applicat Vol.7 No.2

Optimization of Several Environmental Factors to Human Performance by Using Taguchi Method

A. R. Ismail,M. H. M. Haniff,M. Y. M. Yusof,M. N. A. Rahman,J. A. Ghani 대한산업공학회 2010 Industrial Engineeering & Management Systems Vol.9 No.2

The objective of this study is to determine the dominance effects of environmental factors such as Illuminance, humidity and Wet Bulb Globe Temperature (WBGT) on the operators" productivity at Malaysian electronic industry. A case study was carried out at an electronic components assembly factory. The environmental factors examined were the Illuminance (lux), humidity and WBGT of the surrounding workstation area. Two sets of representative data including the illuminance, humidity and WBGT level and production rate were collected during the study. The production rate data were collected through observations and survey questionnaires while the illuminance level was measured using photometer model RS 180-7133, the humidity and WBGT level were measured by using Quest Temp apparatus and humidity. Taguchi Method was utilized to find the sequence of dominant factors that contributed to the productivity of operator at that specified production workstation. The study reveals that the dominant factor contributed to the productivity was WBGT, followed by illuminance and humidity.