Displaying publications 101 - 120 of 2919 in total

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  1. Fulltext The Scorching Truth: Investigating the Impact of Heatwaves on Selangor's Elderly Hospitalisations
    Yong KH, Teo YN, Azadbakht M, Phung H, Chu C
    Int J Environ Res Public Health, 2023 May 22;20(10).
    PMID: 37239636 DOI: 10.3390/ijerph20105910
    Global climate change has contributed to the intensity, frequency, and duration of heatwave events. The association between heatwaves and elderly mortality is highly researched in developed countries. In contrast, heatwave impact on hospital admissions has been insufficiently studied worldwide due to data availability and sensitivity. In our opinion, the relationship between heatwaves and hospital admissions is worthwhile to explore as it could have a profound impact on healthcare systems. Therefore, we aimed to investigate the associations between heatwaves and hospitalisations for the elderly by age group in Selangor, Malaysia, from 2010 to 2020. We further explored the impact of heatwaves on the risks of cause-specific hospital admissions across age groups within the elderly. This study applied generalized additive models (GAMs) with the Poisson family and distributed lag models (DLMs) to estimate the effect of heatwaves on hospitalisations. According to the findings, there was no significant increase in hospitalisations for those aged 60 and older during heatwaves; however, a rise in mean apparent temperature (ATmean) by 1 °C significantly increased the risk of hospital admission by 12.9%. Heatwaves had no immediate effects on hospital admissions among elderly patients, but significant delay effects were identified for ATmean with a lag of 0-3 days. The hospital admission rates of the elderly groups started declining after a 5-day average following the heatwave event. Females were found to be relatively more vulnerable than males during heatwave periods. Consequently, these results can provide a reference to improve public health strategies to target elderly people who are at the greatest risk of hospitalisations due to heatwaves. Development of early heatwave and health warning systems for the elderly would assist with preventing and reducing health risks while also minimising the burden on the whole hospital system in Selangor, Malaysia.
    Matched MeSH terms: Hot Temperature*; Temperature
  2. Fulltext Seed/Catalyst-Free Growth of Gallium-Based Compound Materials on Graphene on Insulator by Electrochemical Deposition at Room Temperature
    Rashiddy Wong F, Ahmed Ali A, Yasui K, Hashim AM
    Nanoscale Res Lett, 2015 Dec;10(1):943.
    PMID: 26055478 DOI: 10.1186/s11671-015-0943-y
    We report the growth of gallium-based compounds, i.e., gallium oxynitride (GaON) and gallium oxide (Ga2O3) on multilayer graphene (MLG) on insulator using a mixture of ammonium nitrate (NH4NO3) and gallium nitrate (Ga(NO3)3) by electrochemical deposition (ECD) method at room temperature (RT) for the first time. The controlling parameters of current density and electrolyte molarity were found to greatly influence the properties of the grown structures. The thicknesses of the deposited structures increase with the current density since it increases the chemical reaction rates. The layers grown at low molarities of both solutions basically show grain-like layer with cracking structures and dominated by both Ga2O3 and GaON. Such cracking structures seem to diminish with the increases of molarities of one of the solutions. It is speculated that the increase of current density and ions in the solutions helps to promote the growth at the area with uneven thicknesses of graphene. When the molarity of Ga(NO3)3 is increased while keeping the molarity of NH4NO3 at the lowest value of 2.5 M, the grown structures are basically dominated by the Ga2O3 structure. On the other hand, when the molarity of NH4NO3 is increased while keeping the molarity of Ga(NO3)3 at the lowest value of 0.8 M, the GaON structure seems to dominate where their cubic and hexagonal arrangements are coexisting. It was found that when the molarities of Ga(NO3)3 are at the high level of 7.5 M, the grown structures tend to be dominated by Ga2O3 even though the molarity of NH4NO3 is made equal or higher than the molarity of Ga(NO3)3. When the grown structure is dominated by the Ga2O3 structure, the deposition process became slow or unstable, resulting to the formation of thin layer. When the molarity of Ga(NO3)3 is increased to 15 M, the nanocluster-like structures were formed instead of continuous thin film structure. This study seems to successfully provide the conditions in growing either GaON-dominated or Ga2O3-dominated structure by a simple and low-cost ECD. The next possible routes to convert the grown GaON-dominated structure to either single-crystalline GaN or Ga2O3 as well as Ga2O3-dominated structure to single-crystalline Ga2O3 structure have been discussed.
    Matched MeSH terms: Temperature
  3. Barium(II)-2,4-dinitrophenolate-18-crown-6 at 183 K
    Usman A, Chantrapromma S, Fun HK
    Acta Crystallogr C, 2002 Jan;58(Pt 1):m45-7.
    PMID: 11781470
    The title compound, bis(2,4-dinitrophenolato-kappa2O,O')(1,4,7,10,13,16-hexaoxadecane-kappa6O)barium(II), [Ba(C6H3N2O5)2(C12H24O6)], is a 1:1 complex of barium(II)-2,4-dinitrophenolate and 1,4,7,10,13,16-hexaoxacyclooctadecane (18-crown-6). Its structure is located on a crystallographic inversion centre. The temperature dependence of the crystal structure has been studied. The monoclinic beta angle of the P2(1)/n space group increases with increasing temperature. The packing structure of the complex is stabilized by intermolecular C-H...O interactions.
    Matched MeSH terms: Temperature
  4. Destructive heat and cooling prayer: Malay humoralism in pregnancy, childbirth and the postpartum period
    Laderman C
    Soc Sci Med, 1987;25(4):357-65.
    PMID: 3686085 DOI: 10.1016/0277-9536(87)90274-7
    Malaya, an ancient crossroads of trade, was the recipient of Chinese and Ayurvedic humoral ideas and, later, those of medieval Islam. These ideas were readily accepted by Malays, since they are highly congruent with pre-existing notions among aboriginal peoples of Malaya involving a hot-cold opposition in the material and spiritual universe and its effects upon human health. Islamic Malays have adapted these aboriginal beliefs to correspond to the Greek-Arabic humoral model in matters concerning foods, diseases, and medicines. Although Malay theories of disease causation include such concepts as soul loss and spirit attack, along with 'naturalistic' ideas such as dietary imbalance and systemic reactions to foods, all of these theories can either be reinterpreted in humoral terms, or, at least, are congruent with the basic tenets of Islamic humoral pathology. Behaviors and beliefs regarding human reproduction, however, while essentially following a humoral pattern, diverge from Islamic, as well as traditional Chinese and Indian Ayurvedic, humoral theories. Unlike any other major humoral doctrine, Malay reproductive theory (like that of non-Islamic aboriginal peoples of Malaya) equates coldness with health and fertility and heat with disease and sterility. These ideas, in turn, are related to beliefs regarding the nature of the spirit world: the destructiveness of spiritual heat and the efficacy of cooling prayer.
    Matched MeSH terms: Cold Temperature*; Hot Temperature*
  5. Removal and recovery attempt of liquid crystal from waste LCD panels using subcritical water
    Izhar S, Yoshida H, Nishio E, Utsumi Y, Kakimori N
    Waste Manag, 2019 Jun 01;92:15-20.
    PMID: 31160022 DOI: 10.1016/j.wasman.2019.04.060
    With the advancement of the fourth industrial revolution, the demand for LCD has widely accelerated as monitoring screens for computers and cell phones. Consequently, old LCD panels are expected to end up as a tremendous amount of e-waste. Apart from transparent electrodes and transistor, waste LCD panel also contains hazardous liquid crystal compound that can contaminate the landfill site. Thus, removing the material from waste LCD was investigated. In this study, water at subcritical state was applied at temperatures between 100 and 360 °C. Initially, the liquid crystals were extracted using toluene and were used to compare with subcritical water. The specific compounds of the liquid crystals were not identified. The liquid crystals (12 mg/g-LCD) were entirely removed from the LCD panel when treated above 300 °C by means of extraction with the subcritical water. Although liquid crystal was successfully removed, recovery was complicated due to the degradation of liquid crystals above 250 °C. A recovery of 70% was obtained at 250 °C without deformation of the molecules. Consequently, this study has shown that although it is not practical to recover LC from LCD panel waste using subcritical water, liquid crystals can be removed efficiently. This method is auspicious in reducing hazardous liquid crystal from waste LCD panel before their disposals at landfill sites.
    Matched MeSH terms: Temperature
  6. A one-step self-sustained low temperature carbonization of coconut shell biomass produced a high specific surface area biochar-derived nano-adsorbent
    Samsudin MH, Hassan MA, Idris J, Ramli N, Mohd Yusoff MZ, Ibrahim I, et al.
    Waste Manag Res, 2019 May;37(5):551-555.
    PMID: 30727859 DOI: 10.1177/0734242X18823953
    A one-step self-sustained carbonization of coconut shell biomass, carried out in a brick reactor at a relatively low temperature of 300-500°C, successfully produced a biochar-derived adsorbent with 308 m2/g surface area, 2 nm pore diameter, and 0.15 cm3/g total pore volume. The coconut shell biochar qualifies as a nano-adsorbent, supported by scanning electron microscope images, which showed well-developed nano-pores on the surface of the biochar structure, even though there was no separate activation process. This is the first report whereby coconut shell can be converted to biochar-derived nano-adsorbent at a low carbonization temperature, without the need of the activation process. This is superior to previous reports on biochar produced from oil palm empty fruit bunch.
    Matched MeSH terms: Temperature
  7. The influence of atmospheric electrical factors on the healthy and sick man
    de Langen CD
    Malayan Medical Journal, 1934;9:1-10.
    Matched MeSH terms: Temperature
  8. Fulltext Microstrain, particle size and lattice constant of CaCO3 ceramic by Rietveld analysis
    Irzaman, Jamal, Z., Idris, M.S., Kurnia, D., Barmawi, M.
    Journal of Nuclear and Related Technologies, 2007;2005(1):43-46.
    MyJurnal
    The specimens used were CaCO3 (Sigma Aldrich, purity 99.9 %). We have 23 parameters and 20 iterations, including two theta zero error, scale factor, thermal effect, coefficients for polynomial describing the background; U, V, W and mixing parameters of the profile peak function, lattice constants, positional parameters and overall isotropic temperature factors. Most the samples show that the crystal structure are rhombohedral with lattice constants a = b = 4.981 Å, c = 17.044 Å and space group is R3C. The microstrain (K) and the particle size (V) of CaCO3 ceramic were calculated using 10 the full width at half maximum (FWHM) of diffraction peaks from (0 1 2), (1 0 4), (0 0 6), (1 1 0), (1 1 3), (2 0 2), (0 1 8), (1 1 6), (2 2 1 ), (1 2 2) crystal planes are 2.1 x 10-2 and
    362 nm, respectively.
    Matched MeSH terms: Temperature
  9. Fulltext Influence of calcination parameters on CaCu3Ti4O12 formation and its microstructure
    Julie Juliewatty Mohamed, Mohd Riduan, Hutagalung, Sabar Derita, Zainal Arifin Ahmad
    Journal of Nuclear and Related Technologies, 2007;2007(1):171-176.
    MyJurnal
    Dielectric material CaCu3Ti4O12 (CCTO) prepared by solid state technique, was calcined at different temperatures (700 - 1000 o C) for 6 and 12 hours. The calcined powder were analysed by XRD to identify the CCTO formation. Then the microstructure was observed by SEM. The CCTO single phase formation was firstly detected on sample calcined at 700 o C for 12 hours. The microstructure obtained shows the particles were spherical in shape. The grain getting larger as calcination temperature was increased.
    Matched MeSH terms: Temperature
  10. Fulltext Intermetallic phase formation and thickness of tin-zinc based lead-free solders
    Mayappan, Ramani, Ahmad Badri Ismail, Zainal Arifin Ahmad, Hussain, Luay Bakir, Ariga, Tadashi
    Journal of Nuclear and Related Technologies, 2007;2007(1):143-148.
    MyJurnal
    In this study the intermetallic (IMC) thickness of Sn-Pb, Sn-Zn and Sn-Zn-Bi solders on copper (Cu) substrate were measured at different temperatures using reflow methods. Cu6Sn5 intermetallic phase was detected between Sn-Pb solder and Cu substrate. The J-Cu5Zn8 phase was detected between Sn-Zn and Sn-Zn-Bi lead-free solders with Cu substrate. The thickness of the intermetallics increases with temperature. The IMC thickness for Sn-8Zn-3Bi solder is lower than Sn-9Zn solder for all the soldering temperatures, indicating that Bi has suppressed the initial IMC formation.
    Matched MeSH terms: Temperature
  11. Fulltext Study of CNG combustion under internal combustion engines conditions part I: using quasi-dimensional modelling
    Bakhshan, Y., Shahrir Abdullah
    Pertanika Journal of Science & Technology, 2009;17(2):-.
    MyJurnal
    An in-house quasi-dimensional code has been developed which simulate the overlap, intake, compression, combustion, as well as expansion and exhaust processes of a homogeneous charged internal combustion engine (ICE). A detailed chemical kinetic mechanism, constituting of 39 species and 148 elementary reactions, has been used in conjunction with above code to study the combustion of CNG under IC engine conditions. Two different criteria, based on pressure rise and mass of fuel burned, are used to detect the onset of ignition. Parametric studies are conducted to show the effect of compression ratio, initial pressure, intake temperature and equivalence ratio, on the time of ignition and fuel burning rate. The results obtained from the modelling show a good agreement with the experimental data.
    Matched MeSH terms: Temperature
  12. Fulltext Optimisation of Biomethane production by anaerobic digestion of food waste
    Nurul Shahida Osman, Zainon Mohd Noor, Zatilfarihiah Rasdi, Iwana Izni Zainuddin, Noor Azrimi Umor
    Pertanika Journal of Science & Technology, 2017;25(107):101-110.
    MyJurnal
    Food waste is a mixture of organic residues that affect fermentation process. Thus, appropriate parameters should be optimised to ensure high biomethane production. In this research, response surface methodology (RSM) was utilised for building models, evaluating the significance of several independent factors (pH, temperature, substrate concentration and inocula size) and determining optimum conditions for desirable responses (biomethane yield). The RSM and contour plots set the optimum working factors in order to accomplish the desired biomethane yield. Results suggest that biomethane yield can be increased when pH and temperature are increased. Thus, the main effects of parameters are pH and temperature.
    Matched MeSH terms: Temperature
  13. Fulltext An insight on the relationship between food compressibility and microbial inactivation during high pressure processing
    Fauzi NA, Farid MM, Silva F
    J Food Sci Technol, 2017 Mar;54(3):802-809.
    PMID: 28298695 DOI: 10.1007/s13197-017-2526-7
    This paper investigates the effect of high pressure liquid food compressibility onS. cerevisaeinactivation. Honey with various adjusted sugar with different values of compressibility was selected as a model food.S. cerevisiaecells in different honey concentrations (0-80°Brix), 600 MPa (at ambient temperature) showed an increasing resistance to inactivation with increasing °Brix.D-values ofS. cerevisiaeat 200, 400 and 600 MPa, for 20 min/80°Brix were 136.99 ± 7.97, 29.24 ± 6.44 and 23.47 ± 0.86 min, respectively. TheseD-values resulted the Z
    p
    -value of 526 ± 39 MPa. A significant correlation (p 
    Matched MeSH terms: Temperature
  14. Observations on normal temperatures in Singapore school girls
    Porter EG, Gibson Hill MMH
    Med J Malaya, 1951;5.
    1. Using ordinary clinical thermometers resting oral temperatures were taken in 4,463 schoolgirls between the ages of 6 and 20 years. 2. From 2,500 readings in clinically healthy and apyrexial girls charts were made to show temperature variations. 3. It was demonstrated that in the age group 6-10 the mean temperature was 99.5 F. That in the age group 10-14 the mean temperature was 99.3 F and in the age group 14-20 the mean temperature was 99.1 F. 4. For all age groups the majority fell within the limit of 98.9 – 100 F. 5. It is not uncommon to encounter a temperature of over 100º and up to 100.8º of no pathological significance. 6. Temperature readings are not a reliable guide in the clinical assessment of children unless the above considerations are borne in mind.
    Matched MeSH terms: Temperature
  15. MHD boundary layer flow due to an exponentially stretching sheet with radiation effect
    Anuar Ishak
    Sains Malaysiana, 2011;40.
    The effect of radiation on magnetohydrodynamic (MHD) boundary layer flow of a viscous fluid over an exponentially stretching sheet was studied. The governing system of partial differential equations was transformed into ordinary differential equations before being solved numerically by an implicit finite-difference method. The effects of the governing parameters on the flow field and heat transfer characteristics were obtained and discussed. It was found that the local heat transfer rate at the surface decreases with increasing values of the magnetic and radiation parameters.
    Matched MeSH terms: Hot Temperature
  16. Life form of early spring plants in relation to the altitude and climate change
    Shukurov E, Nabiyev M, ALI-ZADE V
    Sains Malaysiana, 2013;42:1467-1471.
    The purpose of the investigation was to study the early spring plant diversity distributed in different vegetation types and their life forms, in relation to different altitudes. The investigation was carried out in accordance with itinerary method beginning from the shoreline up to the mountain. The results showed that 100% of the totally collected plants from the desert vegetation were therophytes; 100% from steppe vegetation were geophytes; 50 from forest were geophytes and the other 50% were hemicryptophytes. It is concluded that the life forms of early spring plants change depending on the altitude corresponding to changes in the air temperature as well as climatic and edaphic factors.
    Matched MeSH terms: Temperature
  17. Flow and heat transfer of a power-law fluid over a permeable shrinking sheet
    Nor Azizah Yacob, Anuar Ishak
    Sains Malaysiana, 2014;43:491-496.
    The steady, two-dimensional laminar flow of a power-law fluid over a permeable shrinking sheet of constant surface temperature is investigated. The governing partial differential equations were transformed into a system of nonlinear ordinary differential equations using a similarity transformation, before being solved numerically by the Runge-Kutta- Fehlberg method with shooting technique. The results are presented graphically and the effects of the power-law index n, suction parameter fw and Prandtl number Pr were discussed. It was found that stronger suction is necessary for the solution to exist for a pseudoplastic fluid (n<1) compared to a dilatant fluid (n>1).
    Matched MeSH terms: Temperature
  18. Spatial and Temporal Variations in Nutrients During Upwelling Season Off the East Coast of Peninsular Malaysia
    Uning R, Suratman S, Nasir FAM, Latif MT
    Bull Environ Contam Toxicol, 2022 Jan;108(1):145-150.
    PMID: 34296326 DOI: 10.1007/s00128-021-03334-0
    This study determines the bulk surface water (BSW) dissolved inorganic nutrients of nitrogen (DINi) and phosphate (DIP) during the upwelling season off the east coast of Peninsular Malaysia, South China Sea. BSW samples were analysed for DINi and DIP by using a standard automated colorimetric method. BSW DINi and DIP concentrations varied between 0.11 and 2.55 μM (mean 1.12 ± 0.63 μM), and below detection limit, and 0.29 μM (mean 0.11 ± 0.08 μM), respectively. The spatial distribution of higher concentrations between DINi and DIP was distinct. However, the highest concentrations of DINi and DIP were mostly recorded in the month of peak upwelling (July and August), where colder BSW temperatures were also encountered during field sampling. This study provides new evidence on the presence of BSW nutrients of DINi and DIP during upwelling season peak in July and August before their decline in September.
    Matched MeSH terms: Temperature
  19. Recent advances in simultaneous thermostability-activity improvement of industrial enzymes through structure modification
    Nezhad NG, Rahman RNZRA, Normi YM, Oslan SN, Shariff FM, Leow TC
    Int J Biol Macromol, 2023 Mar 31;232:123440.
    PMID: 36708895 DOI: 10.1016/j.ijbiomac.2023.123440
    Engineered thermostable microbial enzymes are widely employed to catalyze chemical reactions in numerous industrial sectors. Although high thermostability is a prerequisite of industrial applications, enzyme activity is usually sacrificed during thermostability improvement. Therefore, it is vital to select the common and compatible strategies between thermostability and activity improvement to reduce mutants̕ libraries and screening time. Three functional protein engineering approaches, including directed evolution, rational design, and semi-rational design, are employed to manipulate protein structure on a genetic basis. From a structural standpoint, integrative strategies such as increasing substrate affinity; introducing electrostatic interaction; removing steric hindrance; increasing flexibility of the active site; N- and C-terminal engineering; and increasing intramolecular and intermolecular hydrophobic interactions are well-known to improve simultaneous activity and thermostability. The current review aims to analyze relevant strategies to improve thermostability and activity simultaneously to circumvent the thermostability and activity trade-off of industrial enzymes.
    Matched MeSH terms: Temperature
  20. Fulltext Daily temperature effects on under-five mortality in a tropical climate country and the role of local characteristics
    Phung VLH, Oka K, Honda Y, Hijioka Y, Ueda K, Seposo XT, et al.
    Environ Res, 2023 Feb 01;218:114988.
    PMID: 36463996 DOI: 10.1016/j.envres.2022.114988
    BACKGROUND: Climate change and its subsequent effects on temperature have raised global public health concerns. Although numerous epidemiological studies have shown the adverse health effects of temperature, the association remains unclear for children aged below five years old and those in tropical climate regions.

    METHODS: We conducted a two-stage time-stratified case-crossover study to examine the association between temperature and under-five mortality, spanning the period from 2014 to 2018 across all six regions in Malaysia. In the first stage, we estimated region-specific temperature-mortality associations using a conditional Poisson regression and distributed lag nonlinear models. We used a multivariate meta-regression model to pool the region-specific estimates and examine the potential role of local characteristics in the association, which includes geographical information, demographics, socioeconomic status, long-term temperature metrics, and healthcare access by region.

    RESULTS: Temperature in Malaysia ranged from 22 °C to 31 °C, with a mean of 27.6 °C. No clear seasonality was observed in under-five mortality. We found no strong evidence of the association between temperature and under-five mortality, with an "M-" shaped exposure-response curve. The minimum mortality temperature (MMT) was identified at 27.1 °C. Among several local characteristics, only education level and hospital bed rates reduced the residual heterogeneity in the association. However, effect modification by these variables were not significant.

    CONCLUSION: This study suggests a null association between temperature and under-five mortality in Malaysia, which has a tropical climate. The "M-" shaped pattern suggests that under-fives may be vulnerable to temperature changes, even with a small temperature change in reference to the MMT. However, the weak risks with a large uncertainty at extreme temperatures remained inconclusive. Potential roles of education level and hospital bed rate were statistically inconclusive.

    Matched MeSH terms: Cold Temperature; Hot Temperature*; Temperature
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