Displaying publications 81 - 100 of 520 in total

  1. Mohd Syazwan, S., Aqbal, H.A., Azhar, H., Zulhadi, M., Sharifah Allyana, S.M.R., Baba M.D.
    Pedestrians' fatality trend in road crashes has been improving in recent years though it remains third in rank behind
    motorcyclists and car occupants. Based on the statistics, young pedestrians were the most affected group and the
    commonest injury regions were head and legs. Pedestrian crashes occurred primarily in rural areas and straight roads
    and at low light environment, and often involve cars and motorcycles. In addition to existing issues of careless and
    illegal crossing practices, there are potential new hazards face by pedestrian, which are mobile electronic device use
    and electric vehicle, especially when crossing roads. Road safety programs and interventions shall consider these new
    Matched MeSH terms: Environment
  2. Tawfikur Rahman, Motakabber, S.M.A., Ibrahimy, M.I.
    Scientific Research Journal, 2017;14(2):17-34.
    In recent years, the utility grid system is more essential for the power
    transmission and distribution system because it cannot produce harmful
    gases or no discharge waste in the environment. PWM based phase
    synchronous invert systems are generally utilised in the high efficiency
    energy supply, long distance and higher power quality. The inverter output
    voltage depends on the coupling transformer, input sources and invert
    controllers. An inverter using a three leg IGBT has been designed for utility
    grid and simulated by using MATLAB2014a. In this paper, both sides of
    the LCL filters are used for removing the DC ripple current, reducing the
    noise and synchronous the output phase between inverter and the utility
    grid. The PWM controller has created pulse signal to control the inverter,
    electronic switches and precisely synchronise with grid line frequency. In
    this system, the input DC voltage 500V, switching frequency 1.65 kHz, grid
    frequency 50Hz, 20 km feeder (resistance, inductance and capacitance per
    unit length, which are 0.1153, 1.05e-3 and 11.33e-09 ohms/km) with 30MW
    three phase load (active and inductive reactive power which are 30e6 W
    and 2e6 var) and also a balanced utility grid load of star configuration (00,
    1200, and 2400 degree) are considered in the design. On the other hand,
    three phase transformer consists of three signal phase transformers, normal
    power 100e3, magnetization resistance and inductance which are 500 pu and
    416.67pu are considered in this design. The system conversion efficiency
    is 99.94% and 99.96%, while the total THD are 0.06% on inverter side
    and 0.04% on grid side.
    Matched MeSH terms: Environment
  3. Mohamed Khairi Termizi, Mazlan Ismail
    Various claims have been made about the extinction of Malay Reservation Land in the country. Before
    independence, the land depreciation was due to the acquisition of land by the British colonial
    government for mining, opening of new villages during the communist threat and the mortgage and
    sale activities by the Malay landowners to non-Malays. After independence, land depreciation linked
    with the acquisition of land by the government through the Land Acquisition Act, 1960. This study is a
    content analysis study involving material derived from the secondary source text and earlier research
    findings. Emphasis is given to analyze the statistical size of Malay Reservation Land in the country.
    Results show that the allegations regarding the depreciation trend of the Malay Reservation Land is
    inaccurate and misleading. While the analysis of the size of the Malay Reservation Land found that the
    actual percentage of Malay Reservation Land in 2009 was 30.13 percent instead of 11.83 percent as
    claimed. The percentage grew steadily in 2013 to 31.85 percent. The analysis also found that there was
    confusion about the actual size of Malay Reservation Land in the country.
    Matched MeSH terms: Environment
  4. Mohamed Shahrizan Abu Bakar, Khairuddin Idris, Zoharah Omar, Siti Normaliz Othman
    Workplace deviant behavior is an action performed voluntarily by an individual and harms the
    organizational norms and affects individual, organization or both. Therefore, it is a priority to the
    organization to understand and look at the workplace deviant behavior issue because different
    individual and environment will cause differences in how an individual behaves. Understanding the
    terms, factors, typologies and effects of deviant behavior will enable organization to draw the
    rehabilitation plan so deviant behavior will be curbed from the beginning. Overcoming workplace
    deviant behavior will result in positive impact to the organization management and financial and will
    lead to positive and conducive environment at the workplace.
    Matched MeSH terms: Environment
  5. Mohammed Saleh Alosani, Rushami Zien Yusoff, Ali Musaed Alansi
    Improving organizational performance is the main objective of any organization. Six
    Sigma is one of the most important approaches to improve performance and sustain
    competitive advantage. This article reviewed the literature related to organizational
    performance and explains the potential impact of Six Sigma and innovation culture on
    organizational performance. Given that previous studies have reported inconclusive
    results, this paper tries to establish a mechanism to explain the role of Six Sigma in
    improving organizational performance. Therefore, based on the theoretical foundation
    and comprehensive review of previous literature, a research framework is proposed.
    This proposed framework is grounded in the implementation of Six Sigma projects; it
    also establishes that innovation culture can help organizations to achieve success in a
    turbulent business environment.
    Matched MeSH terms: Environment
  6. Adam, M.B., Norazman, N., Mohamad Kasim, M.R.
    MATEMATIKA, 2018;34(1):113-123.
    Logging activity is one of the most important activities for tropical countries
    including Malaysia, as it produces quality trees for papers. One of the important tree
    species is the Acacia Mangium which it produces a soft tree for papermaking enterprises.
    The papers are exported to Europe and countries which have high demand for paper
    due to the rapid development of the printing industry. Thus we analyzed the height for
    individual trees. We investigate the maximum height of the trees from 1990 to 2006
    and we fit the data using extreme value model. Some of the data are missing and three
    imputation methods we used to solve this problem.
    Matched MeSH terms: Environment
  7. Wang G, Pu X
    Sains Malaysiana, 2014;43:807-812.
    A distinct element approach has been introduced for simulating the plugging performance of granular lost circulation materials (LCM) in a fracture. This approach solves the fully coupled fracture walls, fluid and particles system in an interactive environment. The effects of the particle shape, size distribution and concentration on the fracture-plugging performance of the granular LCM have been investigated using the three-dimensional particle flow code (PFC3D). The simulated results showed that the irregular granular LCM could plug a fracture width larger than the sieving granulation by single-particle bridging type. The particle size distribution (PSD) of LCM dominates the plugging depth and efficiency in a fracture and there exists an optimum concentration for maximum effect of LCM additives.
    Matched MeSH terms: Environment
  8. Othman A. Karim, Crapper M, Ali K.H.M.
    The study of cohesive sediment in the laboratory gives rise to a number of instrumentation problems, especially in the location of mud bed, fluid mud and hindered settling layers and in the measurement of flow velocities. This paper describes the application of medical diagnostic ultrasound technique in the cohesive sediment study conducted at the University of Liverpool, United Kingdom. This paper illustrates that the use of ultrasound technique creates a reasonably flexible environment for the study of fluid mud phenomenon in which bed formation and flow velocities can be measured easily, accurately and non-intrusively. This in turn will assist in development of computer models to predict the environmental impact, siltation rates and dredging requirements in both new and existing ports and harbour developments.
    Kajian endapan berjeleket di dalam makmal mengalami pelbagai masalah peralatan, terutamanya bagi menentukan lokasi dasar lumpur, pengenapan terhalang dan pengukuran halaju aliran. Dalam makalah ini diterangkan penggunaan teknologi diagnosis perubatan ultrabunyi dalam kajian endapan berjeleket, yang dijalankan di University of Liverpool, United Kingdom. Ditunjukkan bahawa penggunaan teknologi ultrabunyi keadaan yang begitu boleh suai bagi kajian fenomenon lumpur yang pembentukan dasar dan halaju aliran dapat diukur dengan mudah, tepat dan tanpa gangguan. lni seterusnya dapat membantu di dalam pembangunan model komputer bagi menjangka kesan sekitaran, kadar enapan dan keperluan mengorek bagi pembangunan kawasan pelabuhan baru dan sedia ada.
    Matched MeSH terms: Environment
  9. Lalang Buana, Ahmad Mahir Razali, Zainodin Haji Jubok
    The changes on the vegetables oil trading environment might change the foundation of palm oil pricing and induce a structural change to the price model. Failing to take it account the structural change in a data series might lead to misspecification of the actual model. This study, however, showed that structural change was not present in the monthly, January 1983 to July 1995, palm oil price, but it was present on the unconditional variance. The underlying model of this series was ARIMA (3, 1, 0) with ARCH (1). The critical change of the unconditional variance took place in April 1989.
    Perubahan dalam suasana perdagangan minyak sayuran boleh mengubah asas harga minyak kelapa sawit. Seterusnya ia merangsang perubahan dalam struktur model harga minyak tersebut. Kegagalan untuk mengambil kira perubahan struktur dalam siri data menjadikan model itu tidak menepati spesifikasi daripada model sebenar. Kajian ini mendapati bahawa perubahan struktur tidak berlaku bagi data harga minyak sawit dari Januari 1983 hingga Julai 1995. Tetapi perubahan berlaku pada varians tidak bersyaratnya. Model asas bagi siri ini adalah ARIMA (3,1,0) dengan ARCH(1). Didapati juga bahawa perubahan yang kritikal bagi varians tidak bersyarat berlaku pada bulan April 1989.
    Matched MeSH terms: Environment
  10. Desa A, Ahmad A, Sharkawi Z
    Jurnal Psikologi Malaysia, 2009;olume 23:19-25.
    This study explores whether differences in levels of psychological well-being exist between the Orang Asli in Pertak and those in Gerachi Jaya. Field studies were conductecl on orang Asli in both these villages by using structured interviews. Psychological well-being questionnaires were modified by the researcher based on the Psychological Well-being Scale (Ryff 1989). Psychological well-being was measured in terms of autonomy, control environment, personal development and positive relationships. This study involved 40 Orang Asli from Gerachi City and 35 Orang Asli from Pertak. Data were analyzed with SPSS software using t-tests. Results show that the levels of psychological well-being between the two groups were not significantly different (t= 0.339, k> 0.05). Implications are also discussed.
    Matched MeSH terms: Environment
  11. Junaidi Asis, Basir Jasin
    Sains Malaysiana, 2015;44:1397-1405.
    Miocene larger benthic foraminifera have been discovered from a limestone unit of the Kalumpang Formation. The limestone is exposed at the Teck Guan Quarry, Tawau, southeast Sabah. The Kalumpang Formation consists predominantly of interbedded mudstone and sandstone (graywacke), conglomerate, limestone, marl, chert and volcanic rocks. Five limestone samples have been collected and processed for petrographic analysis and identification of larger benthic foraminifera. The limestone is classified as packstone and mudstone. A total of seventeen species of larger benthic foraminifera have been identified. The foraminifera are divided into two assemblages namely Assemblage I and Assemblage II. Assemblage I is characterized by the presence of Lepidocyclina (Nephrolepidina) parva, Operculina sp. and Lepidocyclina (Eulepidina) formosa. This assemblage is an indicative of Aquitanian to Burdigalian in age (Early Miocene). Assembalge II comprises of Lepidocyclina (Nephrolepidina) sumatrensis, Lepidocyclina (Nephrolepidina) angulosa, Lepidocyclina (Nephrolepidina) ferreroi Lepidocyclina sp., Miogypsina sp., Katacycloclypeus annulatus, Katacyloclypeus martini, Cycloclypeus carpenteri, Cycloclypeus indopacificus, Cycloclypeus sp., Flosculinella bontangensis, Operculina complanata, Amphistegina bowdenensis and Amphistegina sp. This assemblage is an indicative of Langhian to Serravallian age (Middle Miocene). The foraminiferal assemblages suggest that the depositional environment was a warm tropical shallow-marine at the fore-reef shelf zone.
    Matched MeSH terms: Environment
  12. Norshahida Shaadan, Sayang Mohd Deni, Abdul Aziz Jemain
    Sains Malaysiana, 2015;44:1531-1540.
    In most research including environmental research, missing recorded data often exists and has become a common problem for data quality. In this study, several imputation methods that have been designed based on the techniques for functional data analysis are introduced and the capability of the methods for estimating missing values is investigated. Single imputation methods and iterative imputation methods are conducted by means of curve estimation using regression and roughness penalty smoothing approaches. The performance of the methods is compared using a reference data set, the real PM10 data from an air quality monitoring station namely the Petaling Jaya station located at the western part of Peninsular Malaysia. A hundred of the missing data sets that have been generated from a reference data set with six different patterns of missing values are used to investigate the performance of the considered methods. The patterns are simulated according to three percentages (5, 10 and 15) of missing values with respect to two different sizes (3 and 7) of maximum gap lengths (consecutive missing points). By means of the mean absolute error, the index of agreement and the coefficient of determination as the performance indicators, the results have showed that the iterative imputation method using the roughness penalty approach is more flexible and superior to other methods.
    Matched MeSH terms: Environment
  13. Noor Badshah, Hassan Shah, Muhammad Javid
    Sains Malaysiana, 2015;44:1423-1430.
    Dengue fever is a vector-borne viral disease which is now endemic in more than 100 countries affecting more than 2.5 billion people worldwide. In recent years, dengue fever has become a major threat to public health in Pakistan. In this paper, we derived an explicit formula for reproduction number R0 (the most important epidemiological parameter) and then used real data of dengue fever cases of different hospitals of Lahore (Pakistan) on R0. Conditions for local stability of equilibrium points are discussed. In the end, simulations are carried out for different situations.
    Matched MeSH terms: Environment
  14. Dzulhelmi M, Norma-Rashid Y
    Sains Malaysiana, 2014;43:497-502.
    The seasonal variation of spider assemblages in botanical garden was investigated. The spiders were manually collected by diurnal and nocturnal session between two seasons. A total of 19 families from 65 genera and 96 species were recorded. Richness-estimator indicates the inventory were 67% complete within the botanical garden. The capture rate for web-weavers were higher compared with non-web weavers. The comparison value showed the species composition and abundance were similar between seasons. Spider abundance was not affected between wet and dry season in tropical countries.
    Matched MeSH terms: Environment
  15. Tiew KG, Basri NEA, Deng H, Watanabe K, Zain SM, Wang S
    J Environ Manage, 2019 May 01;237:255-263.
    PMID: 30798044 DOI: 10.1016/j.jenvman.2019.02.033
    After twenty-four years of government efforts, the latest national recycling rate in Malaysia rose from 5% in 1993 to approximately 24.6% in 2017. However, the practice of solid waste recycling in developing countries is still challenging compared to developing countries. Especially in Malaysia, a multi-ethnic country where people with different ethics have different living lifestyles. Still, Malaysia faces rapidly increasing solid waste and management costs, lacks appropriate data on solid waste management and recycling, lacks awareness of the 3R's (reduce, reuse and recycle) culture and lacks policies to promote 3R's culture. In addition, prior to the enforcement of ACT 672, information and networks between stakeholders have been limited for more than 20 years. Some scholars believe that the success of recycling practices is mainly influenced by community recycling behaviours. Therefore, in order to improve and evaluate the effectiveness of current national solid waste recycling management systems, research and assessment of community recycling behaviours are essential. This paper aims to evaluate the factors that attract communities to implement recycling in their daily lives and to obtain data through quantitative survey methods. Face-to-face questionnaires are conducted through purposive sampling and collected data is further analysed by PASW statistical tools. The comparison between recyclers and non-recyclers are presented in terms of frequency, means scores and radar chart. The results indicate that policy makers involved in the planning, organisation, and implementation of community recycling programs have to focus on strategies that engage community members and adopt recycling practices to improve environmental impact by changing their attitudes. Based on the results of means scores, the type of age, occupation and place of life must be taken into consideration in order to organize future recycling campaigns or awareness programs. In conclusion, the information will help policymakers make better solid waste recycling management to meet the needs of the public.
    Matched MeSH terms: Environment
  16. Razieh Shojanoori, Helmi Z.m. Shafri, Shattri Mansor, Mohd Hasmadi Ismail
    Sains Malaysiana, 2016;45:1025-1034.
    The growth of residential and commercial areas threatens vegetation and ecosystems. Thus, an urgent urban management
    issue involves determining the state and the quantity of urban tree species to protect the environment, as well as controlling
    their growth and decline. This study focused on the detection of urban tree species by considering three types of tree
    species, namely, Mesua ferrea L., Samanea saman, and Casuarina sumatrana. New rule sets were developed to detect these
    three species. In this regard, two pixel-based classification methods were applied and compared; namely, the method of
    maximum likelihood classification and support vector machines. These methods were then compared with object-based
    image analysis (OBIA) classification. OBIA was used to develop rule sets by extracting spatial, spectral, textural and color
    attributes, among others. Finally, the new rule sets were implemented into WorldView-2 imagery. The results indicated
    that the OBIA based on the rule sets displayed a significant potential to detect different tree species with high accuracy.
    Matched MeSH terms: Environment
  17. Jiang L, Yue K, Yang Y, Wu Q
    Sains Malaysiana, 2016;45:1041-1047.
    Litter decomposition is vital for carbon and nutrient turnover in terrestrial ecosystems, and this process has now
    been thoroughly demonstrated to be regulated by various mechanisms. The total environment has been continuously
    changing in recent decades, especially in high-latitude regions; these alterations, however, profoundly contribute to the
    decomposition process, but a comprehensive recognition has not available. Here we reviewed the empirical observations
    and current knowledge regarding how hydrological leaching and freeze-thaw events modulate early decomposition of
    plant litter. Leaching contributes a considerable percentage of mass loss and carbon and nutrient release in early stage of
    decomposition, but the magnitudes are different between species levels depending on the chemical traits. Frequent freezing
    and thawing events could positively influence decomposition rate in cold biomes but also hamper soil decomposer and
    there is no general and predictable pattern has been emerged. Further experiments should be manipulated to estimate
    how the altered freezing and thawing effect on carbon and nutrient release from plant litter to better understanding the
    changing environment on litter decomposition.
    Matched MeSH terms: Environment
  18. Mousavi S, Leong SW
    Sains Malaysiana, 2017;46:97-106.
    This paper investigates the compressibility characteristics of compacted clay treated with cement, peat ash and silica
    sand. For this purpose, one dimensional consolidation tests were conducted to determine the soil consolidation properties.
    The test specimens were trimmed from the compaction test specimen. The 1D consolidation test specimen was subjected
    to the normal pressures of 2.5, 5, 10, 20, 40, 80 and 160 kPa in sequence on the test specimen which was saturated with
    distilled water. At the end of the loading period of 80 kPa, the vertical load was removed and the specimen was allowed
    to expand for 24 h for the purpose of evaluating of its swelling behavior. The results showed that void ratio of the soil
    specimens decreased with increasing effective normal pressure. The laboratory investigation clearly demonstrates that,
    settlement is as the compression of a soil specimen due to vertical loading applied at the top surface of the 1D consolidation
    test specimen. It was concluded that, the compression settlement of the stabilized soil with the binder composition of
    18% cement, 2% peat ash and 5% silica sand improved by almost 1.3-fold. A notable discovery is the suitability of the
    stabilized soil for road embankment and low lying marginal area for foundation works; also solving the environmental
    problems in relation to peaty ground. However, sufficient laboratory and field testing are required.
    Matched MeSH terms: Environment
  19. Zong-ji Yang, Taro Uchimura, Jian-ping Qiao, Jian-ping Qiao
    Sains Malaysiana, 2017;46:2029-2034.
    Prevention and mitigation of rainfall induced geological hazards after the Ms=8 Wenchuan earthquake on May 12th, 2008 were significant for rebuild of earthquake hit regions. After the Wenchuan earthquake, there were tens of thousands of fractured slopes which were broken and loosened by the ground shaking, they were very susceptible to heavy rainfall and change forms into potential debris flows. In order to carry out this disaster reduction and prediction effectively in Longmenshan region, careful real-time monitoring and pre-warning of mountain hazards in both regional and site-specific scales is reasonable as alternatives in Wenchuan earthquake regions. For pre-warning the failure of fractured slopes induced by rainfall, the threshold value or the critical value of the precipitation of hazards should be proposed. However, the identification of critical criterion and parameters to pre-warning is the most difficult issue in mountainous hazards monitoring and pre-warning system especially in the elusive and massive fractured slopes widespread in Wenchuan earthquake regions. In this study, a natural coseismic fractured landslide in the Taziping village, Hongkou County, Dujianyan City, was selected to conduct the field experimental test, in order to identify the threshold parameters and critical criterion of the fractured slopes of Taziping. After the field experimental test, the correlation of rainfall intensity, rainfall duration and accumulative rainfall was investigated. The field experimental test was capable of identifying the threshold factors for failure of rainfall-induced fractured slopes after the giant earthquake.
    Matched MeSH terms: Environment
  20. Nelisa Ameera Mohamed Joeharry, Che Aziz Ali, Kamal Roslan Mohamed, Mohd Shafeea Leman
    Sains Malaysiana, 2018;47:1423-1430.
    A single sample from the logged section at eastern side of Gua Panjang limestone hill, southwest of Kampung Kubang
    Rasa Village, Merapoh, has yielded 5 very important conodont species. They are Hindeodus parvus erectus, Hindeodus
    parvus parvus, Hindeodus latidentatus latidentatus, Hindeodus latidentatus praeparvus, Hindeodus postparvus, Hindeodus
    eurypge and Isarcicella staeschi. These Early Triassic conodonts were obtained in a bioclastic dolostone sample, located
    2.5 m above bioclastic grainstone which yielded Late Permian foraminifera. The conodonts found were given Conodont
    Alteration Index (CAI) scale of 5, consistent with the heating of Main Range granitoid during Indosinian Orogeny.
    Limestone harbouring basal Triassic conodonts in Gua Panjang is interpreted to be deposited in an open shallow marine
    shelf environment.
    Matched MeSH terms: Environment
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