Introduction: Behavioural-based safety (BBS) programme is an accident prevention programme emphasized on the aspect of unsafe behaviour, which considerably new in Malaysia. The oil and gas industry is among the industries in Malaysia that has successfully implemented and sustaining the programme. The aim of this study is to measure and evaluate the effectiveness of BBS towards the safety performance in the oil and gas industry in Malaysia that certainly has owned an outstanding safety performance.
Methodology: A cross-sectional study using secondary data involving five indicators in the safety performance in the department of health, safety and environment (HSE) was performed at one of the oil and gas refinery companies in Malaysia. These indicators were chosen based on the frequency of its occurrence from January 2004 to December 2008.
Result: The results of the study show the presence of a significant difference in the incidence rates of near misses (p=0.008) and medical treatment cases (p=0.035) before and after the implementation of BBS and a very strong negative relationship (r=-0.885) between the incidence rates of near-misses and the rates of BBS observations done. However, analysis on unsafe behaviour does not show a significant reduction from 2006 to 2008. Instead, a significant reduction was seen on equipments failure from year 2006 to 2007 (p=0.021) and 2006 to 2008 (p=0.032).
Conclusion: The study has proven that the BBS is effective towards the reduction of the indicators in the safety performance, involving only the incidence rates of the nearmisses and the medical treatment cases. However, a very strong negative relationship only involves the incidence rate of near misses. A significant reduction was also seen on the occurrence of instrument failure, which is one of the root causes of near-misses. Although there is no significant reduction on thye unsafe behaviour, the reduction of equipment failure is expected to be related to the increase in the level of awareness and safe behaviour as a result of BBS implementation.
MeSH terms: Accident Prevention; Accidents; Oil and Gas Industry; Cross-Sectional Studies; Equipment Failure; Malaysia; Ownership; Safety; Incidence
Introduction: Pre-pregnancy care is an important strategy in prevention of adverse maternal and fetal health as well as continuity of good child care. In multi-ethnicity country such as Malaysia there are many cultural, religion and beliefs related to certain life stages.
Methodology: A cross sectional study was conducted among the Indian ethnic group to assess the prevalence and factors associated with pre-pregnancy care. A study was conducted in Taman Manickavasangam Hulu Langat Selangor among the age group of 18-45 year old women.
Result: There were 90 respondents participated in self administered questionnaires. There were 65 respondents (72.2%) married, 24 (26.7%) single and one widow (1.1%). Using a scoring method of analysis (high and low) showed that 55 (61.1%) have high score in knowledge on pre-pregnancy care. The prevalence of pre-pregnancy care practice showed that 63 (70%) scored as high practice. Using correlation analysis showed that there was a significant association between the practice score and increasing age (P=0.03). However, only history of previous pregnancy showed a significant association with the pre-pregnancy care practice and no association found between the practice and knowledge score.
Conclusion: Prepregnancy care helps in screening risk factors of women before conception. This will help in prevention of adverse effect on maternal and foetal. Giving awareness on the importance of having prepregnancy care screening may help women to continue practicing good antenatal care.
Introduction: The aim of this study was to assess the overall diet quality of husbands and wives in a selected urban area in Selangor.
Methodology: This cross-sectional study was carried out in Bandar Baru Bangi, Selangor among 150 married couples aged 20 and above, who voluntarily agreed to participate and were not practicing any special diet. Data were collected using a 2-day 24-Hour Dietary Recall and a Food Frequency Questionnaire (FFQ) to evaluate the quality of diet among husbands and wives using the Diet Quality Index Revised (DQI-R).
Result: Majority of husbands and wives in this study were in the middle-age group, had received tertiary education, had household monthly income of more than RM3, 500 and encompass household size of 3 to 5 persons. The mean DQI-R score for husbands (mean age= 43.33 + 11.16 years) and wives (mean age= 41.28 + 10.93 years) were 67.8 + 9.1 and 64.4 + 9.3 respectively and there was a significant different in scores between the husbands and wives (p < 0.001). In general, the diet quality of this study population was not satisfactory and that the diet quality of husbands was better compared to their wives.
Conclusion: This study gives an insight picture of husbands and wives’ quality of diet. It can be used as a guideline to improve health intervention programs in the future.
Introduction: Back pain associated with sense of pain and less comfort in back part of the body especially at the lower back area. Back pain is an occupational health problem with significant impact to productivity of workers.
Methodology: A cross sectional study was conducted to study the prevalence of back pain towards individual, physical and psychosocial factors associated among body shop’s operators at national Automotive Manufacturers.
Result: A total of 32 operators were involved in this study. Nordic Musculoskeletal questionnaire has been used in this study and body position assessment was done by using Ovako Working Posture Analyzing System (OWAS) method. Study showed the prevalence of back pain among operators throughout their work and in the last 12 months was 93.8% and 87.5% respectively. There are significant association (p0.05) between prevalence of back pain with another individual, physical and psychosocial factor.
Conclusion: This study shows that back pain prevalence were influenced by types of activity and body posture during working at assembling division among workers. Attention should be given to ergonomics factors to prevent back pain incident among automotive industry assembly workers.
MeSH terms: Attention; Back Pain; Cross-Sectional Studies; Human Engineering; Occupational Diseases; Posture; Surveys and Questionnaires; Prevalence; Occupational Health
Introduction: The purpose of this article is to review the definitions of food security and food insecurity as well as the concepts related to food security.
Methodology: This is a systematic review on a few papers, research, and articles according to studies and research by various organizations, experts, scholars on food security in developed and developing countries.
Result: The first definition of food security was given to reflect the comprehensive concerns on the availability of world food supplies. The definition was expanded to incorporate accessibility of food for all people at all times. Then, the complex definitions of food security incorporated food accessibility and availability as well as the quality of food intake. Latest definition integrates the social aspect of food that should be accessed in a socially acceptable way. Broad definition of food insecurity and several terms that closely related were also discovered. The four main concepts of food security from these definitions were identified; availability, accessibility, acceptability and adequacy. These concepts of food security are relevant to micro, meso and macro levels of social and administrative organizations. Conclusion: Understanding definitions and concepts of food security can assist researchers, policy makers and program implementers to conduct research that address the issues of food security.
MeSH terms: Developing Countries; Food; Food Supply; Research; Research Personnel
Traumatic brain injury (TBI) is known to inflict significant morbidity and mortality worldwide. In severe TBI cases, the resulting physical and cognitive impairments incur high management and rehabilitation costs that crucially involve monitoring intracranial pressure (ICP) and improving brain oxygenation. Normobaric Hyperoxia Treatment (NBOT) is a therapeutic strategy to improve brain oxygen metabolism and to decrease ICP by reducing tissue swelling and deactivating toxin. NBOT is administered by increasing the inspired oxygen concentration to 100% in normal atmospheric pressure. Previous studies involving NBOT had explored its effectiveness to salvage the TBI-related cognitive and motor deficits. However, the focus of these studies has frequently been on the cortical lesions despite the known facts that TBI often inflicts tissue damage to the subcortical areas such as the basal ganglia. There are growing evidence to support recent functional theories that implicate a pivotal role of the basal ganglia in regulating normal movements and cognition through dopamine (DA) and glutamate interaction. Thus, tissue damages leading to TBI-related motor and cognitive deficits may involve the different affected brain regions. This minireview attempts to highlight the key processes involved in the pathophysiology of severe TBI and offers insights into the role of NBOT by exploring its potential effects on the cerebral energy metabolism and gene expression patterns of dopamine receptor in a mouse model.
Neural tube defects (NTDs) are the leading cause of disability in humans arising from the malformation of the central nervous system. The genes responsible and their involvement in causing neural tube defects in humans are poorly understood. Gene expression analysis in a whole organism enables the identification of the possible role of the gene being studied. If the gene is expressed in a particular tissue at a certain period of development, this spatiotemporal pattern of the gene of interest signals the possibility that the gene serves a function of being switched on in those tissues at that particular time. In this report, we have identified possible gene candidates in the mouse which may be required for the development of the neural tube, the precursor to the brain and the spinal cord. Development of the brain occurs by closure of the anterior neuropore (forms the cranial neural tube) while the spinal cord forms due to resolution of the posterior neuropore (forms the caudal neural tube). The genes Tiaml and T-cadherin were found to be likely candidate genes for the development of the spinal cord and may serve as potential human NTDs genes.
This paper investigates the confidence intervals of R2 MAD, the coefficient of determination based on
median absolute deviation in the presence of outliers. Bootstrap bias-corrected accelerated (BCa)
confidence intervals, known to have higher degree of correctness, are constructed for the mean and standard deviation of R2 MAD for samples generated from contaminated standard logistic distribution. The results indicate that by increasing the sample size and percentage of contaminants in the samples, and perturbing the location and scale of the distribution affect the lengths of the confidence intervals. The results obtained can also be used to verify the bound of R2 MAD.
Surface sediment samples were collected from five locations at the downstream of Klang River in January 2007 to examine the spatial distribution, composition, and sources of 19 parent polycyclic aromatic hydrocarbons (PAHs) and aliphatic hydrocarbon (n-alkanes) using gas chromatographymass spectrometry. The total concentrations of the 19 PAHs in the sediments were found to range from 1304 to 2187 ng g-1 sediment. Meanwhile, total concentrations of n-alkanes ranged from 17008 to 27116 μg g-1 sediment. The concentration of n-alkanes in the sediment was significantly correlated (r = 0.991, p = 0.001) with the content of sediment organic carbon. In this study, all the sediments exhibited phenanthrene/anthracene (PHE/ANT >15) fluoranthene/(fluorantene+pyrene) (FLT/FLT+PYR < 0.4), ethylphenanthrenes/phenanthrene (MP/P >1), combustion PAHs/total PAHs (CombPAH/Σ19PAH
Part of the Seremban flood mitigation project in the state of Negeri Sembilan, Malaysia is to mitigate
the flood at Jalan Rasah. The mitigation is planned to be implemented in packages. Package I and Package II of River Anak Air Rasah are parts of the project work. In these packages, wider and deeper concrete sections for the river are constructed. The existing undersized culverts were replaced by bigger reinforced concrete box culverts. The size of the box culverts was based on 100-years average reoccurrence interval (ARI). One of these culverts intersected with a rail line connecting Singapore and Malaysia. Trenchless jacking technique was used to lay the box culvert. The total length of the box culvert jacked under the railway line is 33 m, whereas the total width of the twin box culvert is 7.8 m with a total height of 3 m. This was the first time that the trenchless jacking techniques were used for the urban flood mitigation purpose in Malaysia, and it is mainly used to minimise traffic disruption. This study reports the success of using jacking technique in the development of the flood mitigation program of DID in Negeri Sembilan. Among other things, it explains significant performance of the technique under local conditions and experiences gained towards the advancement of tunnelling and trenchless technology.
In this paper, a new method known as Grid Base Classifier was proposed. This method carries the advantages of the two previous methods in order to improve the classification tasks. The problem with the current lazy algorithms is that they learn quickly, but classify very slowly. On the other hand, the eager algorithms classify quickly, but they learn very slowly. The two algorithms were compared, and the proposed algorithm was found to be able to both learn and classify quickly. The method was developed based on the grid structure which was done to create a powerful method for classification. In the current research, the new algorithm was tested and applied to the multiclass classification of two or more categories, which are important for handling problems related to practical classification. The new method was also compared with the Levenberg-Marquardt back-propagation neural network in the learning stage and the Condensed nearest neighbour in the generalization stage to examine the performance of the model. The results from the artificial and real-world data sets (from UCI Repository) showed that the new method could improve both the efficiency and accuracy of pattern classification.
Dielectric properties of natural rubber Hevea brasiliensis latex were measured at frequencies 0.2 to 20 GHz, at temperatures of 2, 15, 25, 35, and 50oC and around 30-98% moisture content. Measurements were done using open-ended coaxial line sensor and automated network analyzer. As expected, results showed that dielectric constant increased with increasing moisture. From 0.2 to 2.6 GHz, the losses were governed by conductive losses but for frequencies greater than 2.6 GHz, these were mainly due to dipolar losses. The former is due to conducting phases in hevea latex, while the latter is mainly governed by the orientation of water molecules. The results were analyzed at 2.6, 10, and 18 GHz, respectively. These were then compared with the values predicted by the dielectric mixture equations recommended by Weiner, Bruggeman and Kraszewski. All the measured values were found to be within the Weiner’s boundaries and close to the upper limit of Weiner’s model. It is also close to the predicted values of Bruggeman’s model with a/b = 0.1. All the models including Kraszewski are suitable for predicting the dielectric properties of hevea latex for frequencies 2.6 to 18 GHz, moisture content 30 to 98% and temperatures 2 to 50oC.
Natural ventilation is defined as the number of air exchanges per hour per unit floor area necessary
to reduce high indoor air temperature and humidity. In addition, it maintains the concentration of carbon dioxide. Natural ventilation is preferred in mechanical system as the ventilation opening is built into the greenhouse, with lower construction cost and no energy and maintenance inputs are required. A mathematical model to quantify natural ventilation rates was developed and verified in large-scale greenhouse structures. For this purpose, four Naturally Ventilated Tropical Greenhouse Structures were designed and constructed at the Malaysian Agricultural Research and Development Institute (MARDI). These were single, double, triple, and quadruple span structures with floor areas of 500 m2, 1000 m2, 1500 m2 and 2000 m2, respectively. This paper presents the validation of a mathematical model which was developed to quantify natural ventilation rates which are very crucial to reduce high in-house temperature built up in the tropics. Regression equations of natural ventilation against wind speed were found to be Φw = 0.0632V, Φw= 0.0395V, Φw= 0.0316Vand Φw=0.0276V for the single, double, triple and quadruple spans, respectively. Meanwhile, coefficients of determination showed strong relationships between ventilation rate and wind speed, with R2 = 0.9999 for all structures. Larger floor area was found to have higher in-house temperature than smaller ones. Ventilation rate inside the single-span structure was found to be higher compared to the multi-span structures, which increased linearly with the increasing wind speed at the eaves of structure.
MeSH terms: Carbon Dioxide; Hot Temperature; Humidity; Models, Theoretical; Respiration; Temperature; Ventilation; Wind; Air Pollution, Indoor; Respiratory Rate
Aquaculture is a growing industry with a great potential towards the contribution of the country’s total
fish requirement. Serious efforts have been done to develop and improve the production of fish by rearing high value fish in tanks or ponds. Under the Third National Agricultural Policy (1998-2010), the target is to annually produce 1.93 million tonnes of fish worth approximately RM8.3 billion by the year 2010. Consequently, the development of an automatic fish feeding machine can be very beneficial to the growth of the aquaculture industry. This device was developed to overcome labour problems in the industry and introduce a semi-automatic process in the aquaculture industry. It has the ability to dispense dried fish food in various forms such as pellets, sticks, tablets or granules into fish tanks or ponds in a controlled manner for a stipulated time. The automatic fish feeder is controlled by a digital timer and it is capable of feeding the fish in accordance with a pre-determined time schedule without the presence of an operator, and at a feeding rate of 250g/min. The feeder can be adjusted to the desired height and conveniently moved around to be positioned adjacent to the pond or tank. Meanwhile, its hopper can be covered and easily dissembled to change the size of the hopper to accommodate different capacities of feed. This automatic fish feeder can be implemented in aquaculture system to convenience to fish culturists.
Experiments were conducted to determine the field and economic performances of machines and techniques for crop establishment in lowland paddy in Bangladesh. In machine seeded field, the crops were grown in rows to allow the operation of rotary type weeder for weed control. In hand broadcasted field, crops were not arranged in rows and weed control operation was therefore done through traditional means. Results obtained showed that the effect of rice seeding techniques, using pre-germinated rice seed of BR-1 variety on the effective field capacity, was highly significant. The work rate of hand broadcasting was found to be one to one and a half times faster than that of seeding by manually driven drum type row seeder. Field efficiency of hand broadcasting was about 90 percent, and this was found to be significantly higher than those of machine seeding which ranged from 70-80 percent at both seed rates, since no time was lost in turning. BRRI modified drum type row seeder, with a seeding rate of 60 kg/ha, was shown to be better for an optimum crop yield. Based on partial budget analysis, a farmer can save about US$53.34 per hectare in a year using the BRRI modified drum type row seeder, followed by a rotary weeder as compared to hand seeding, followed by hand weeding.
A series of batch laboratory studies were conducted to investigate the suitability of activated carbon SA2 for the removal of cadmium ions and zinc ions from their aqueous solutions. The single component equilibrium data were analyzed using the Langmuir and Freundlich isotherms. Overall, the Langmuir isotherm showed a better fitting for all adsorptions under investigation in terms of correlation coefficient and error analysis (SSE only 18.2 for Cd2+ and 47.95 for Zn2+). As the binary adsorption is competitive, extended Langmuir models could not predict the binary component isotherm well. The modified extended Langmuir models were used to fit the binary system equilibrium data. The binary isotherm data could be described reasonably well by the modified
extended Langmuir model, as indicated in the error analysis.
Our continuing interest in anthraquinones from the Guttiferae family has led us to look at the genus Cratoxylum. A detailed chemical study on Cratoxylum aborescens resulted in the isolation of three anthraquinones, namely 1,8-dihydroxy-3-methoxy-6-methylanthraquinone (1), vismiaquinone (2) and vismione (3). These compounds were identified using 1D and 2D NMR spectroscopy. This is the first report on the chemistry of Cratoxylum aborescens.
MeSH terms: Anthraquinones; Magnetic Resonance Spectroscopy; Molecular Structure; Clusiaceae
This paper presents investigations into the development of control schemes for end-point vibration
suppression and input tracking of a flexible manipulator. A constrained planar single-link flexible manipulator is considered and the dynamic model of the system is derived using the assumed mode method. To study the effectiveness of the controllers, a Linear Quadratic Regulator (LQR) was initially developed for control of rigid body motion. This is then extended to incorporate a noncollocated PID controller and a feedforward controller based on input shaping techniques to control vibration (flexible motion) of the system. For feedforward controller, positive and modified specified negative amplitude (SNA) input shapers are proposed and designed based on the properties of the system. Results from the simulation of the manipulator responses with the controllers are presented in time and frequency domains. The performances of the control schemes are assessed in terms of level of vibration reduction, input tracking capability and time response specifications. Finally, a comparative assessment of the control techniques is presented and discussed.
An attempt was made in this investigation to trace the dynamic response of roller compacted concrete dam, which is subjected to horizontal ground motion by considering the interactions between flexible foundations, reservoir water, and bottom reservoir sediments. Two-dimensional finiteinfinite element was used for the non-linear elasto-plastic dynamic analysis. In this analysis, special emphasis was given to the non-linear behaviour of discontinuities along RCC dam-bedding rock foundation which was modelled by thin layer interface. Analysis was first carried out under static loading (self-weight and hydrostatic pressure), and this this was followed by seismic analysis, with hydrodynamic pressure effect in a dam-reservoir system. Based on the numerical dynamic results, it is concluded that the bottom reservoir sediment has significant effect on the seismic response of the RCC gravity dam. Moreover, there is a redistribution of the stresses at thin layer interface with significant stresses reduction, which is resulted from the release of energy through different modes of deformation in this region.
MeSH terms: Body Weights and Measures; Foundations; Gravitation; Hydrostatic Pressure; Models, Theoretical; Motion; Plastics; Pressure; Water; Hydrodynamics
Proper integrated management of a dam reservoir requires that all components of the water resource system be known. One of these components is the daily reservoir inflow which is the subject matter of this study, i.e. to establish predictions of what is coming in the next rainfall-runoff process over a catchment. The transformation of rainfall into runoff is an extremely complex, dynamic, and more of a non-linear process. The available six-year average daily rainfall data across the Sembrong dam catchment were computed using the well-known Theissen’s polygon method. Daily reservoir inflow data were extracted by applying the water balance model to the Sembrong dam reservoir. Modelling of relationship between rainfall and reservoir inflow data was done using feed-forward back-propagation neural networks. The final selected model has one hidden layer with 11 neurons in the hidden layer. The selected model was applied for an independent data series testing. Results in relation to specific climatic and hydrologic properties of a small tropical catchment suggested that the model is suitable to be used in forecasting the next day’s reservoir inflow. The efficiencies of the model Abtained indicated the validity of using the neural network for modelling reservoir inflow series.