Displaying publications 1 - 20 of 284 in total

  1. Raharjo J, Mutchar A, Wan Ramil Wan Daud, Norhamidi Muhamad, Herianto Majlan E
    Sains Malaysiana, 2012;41:95-102.
    Dalam kertas ini dibentangkan hasil kajian sifat fizikal dan terma komposit elektrolit berasaskan samarium terdop seria (Ce0.8Sm0.2O1.9, SDC) dan karbonat (67%mol Li2CO3/ 33%mol Na2CO3). Komposit SDC-(Li/Na)2CO3 adalah pengalir berion yang berpotensi digunakan sebagai bahan elektrolit sel fuel oksida pepejal bersuhu rendah (LT-SOFC). Pencirian komposit elektrolit ini meliputi morfologi, luas permukaan bahan, analisis terma dan keliangan pelet elektrolit. Komposit elektrolit SDC-(Li/Na)2CO3 disediakan dalam dua langkah: (1) penyediaan serbuk samarium terdop seria melalui kaedah sol-gel dan (2) pencampuran samarium terdop seria dan karbonat dalam pelbagai komposisi yang berbeza melalui kaedah tindak balas keadaan pepejal. Pelet elektrolit dihasilkan dengan tekanan mampatan 25, 50, 150 and 200 MPa pada suhu pensinteran 500, 600, 700 dan 800oC. Keputusan XRD menunjukkan bahawa penambahan karbonat tidak mengubah struktur fasa SDC. Keputusan FESEM menunjukkan bahawa sebatian karbonat adalah amorfus dan tersebar dengan baik dalam matriks SDC. Semakin tinggi kandungan karbonat dalam komposit, luas permukaan serbuk komposit didapati semakin kecil. Keputusan analisis terma menunjukkan bahawa takat lebur fasa karbonat berkurang dengan berkurangnya kandungan karbonat. Keliangan optimum yang sesuai bagi elektrolit LT-SOFC iaitu 3.38% dan 4.85% telah dicapai masing-masing untuk sampel dengan kandungan karbonat 20% (SDC8020) dan 30% (SDC7030) dengan suhu pensinteran 600oC dan tekanan mampatan 200 MPa.
    Matched MeSH terms: Ions
  2. Sheikhy Narany T, Ramli MF, Aris AZ, Sulaiman WN, Juahir H, Fakharian K
    ScientificWorldJournal, 2014;2014:419058.
    PMID: 24523640 DOI: 10.1155/2014/419058
    Hydrogeochemical investigations had been carried out at the Amol-Babol Plain in the north of Iran. Geochemical processes and factors controlling the groundwater chemistry are identified based on the combination of classic geochemical methods with geographic information system (GIS) and geostatistical techniques. The results of the ionic ratios and Gibbs plots show that water rock interaction mechanisms, followed by cation exchange, and dissolution of carbonate and silicate minerals have influenced the groundwater chemistry in the study area. The hydrogeochemical characteristics of groundwater show a shift from low mineralized Ca-HCO3, Ca-Na-HCO3, and Ca-Cl water types to high mineralized Na-Cl water type. Three classes, namely, C1, C2, and C3, have been classified using cluster analysis. The spatial distribution maps of Na(+)/Cl(-), Mg(2+)/Ca(2+), and Cl(-)/HCO3 (-) ratios and electrical conductivity values indicate that the carbonate and weathering of silicate minerals played a significant role in the groundwater chemistry on the southern and western sides of the plain. However, salinization process had increased due to the influence of the evaporation-precipitation process towards the north-eastern side of the study area.
    Matched MeSH terms: Ions/analysis; Ions/chemistry
  3. Luqman Chuah Abdullah, Saidatul Shima, J., Choong, Thomas S.Y., Muhammad
    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.
    Matched MeSH terms: Ions
  4. Ahmed, Ibrahim Galadima, Abdurrahman Abubakar, Sulaiman Mohammed, Abdulkarim Ali Deba
    Phytoremediation is considered as a cost-effective and environmentally friendly
    technique for decontaminating environments that have been contaminated with
    heavy metal ions. The technique describes the use of plants and their concomitant
    microbes to mitigate environmental contaminations. However, conventional
    remediation techniques like chemical, thermal and physical treatment methods are
    too costly, and may end of causing more contamination to the environment.
    Phytoremediation practice provides a major information on the utilization of plants
    and their materials in decontaminating polluted environments. Heavy metals and
    other organic contaminants are among the most precarious substances released into
    the environment which have an eminent level of toxicity and sturdiness of both
    aquatic and terrestrial organisms. The review aimed at providing a broad
    understanding of utilizing various plants and their materials in decontaminating
    polluted environments with heavy metals and other organic contaminants. It also
    provided the general methods used in treating the aforementioned contaminants in
    an environment. The review further discussed the classes of phytoremediation like
    phytoextraction, phytovolatilisation, phytostabilization, phytotransformation,
    phytodegradation and phytofiltration. The generalized advantages and disadvantages
    of phytoremediation were ultimately highlighted.
    Matched MeSH terms: Ions
  5. Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Asilar E, Bergauer T, et al.
    Phys Rev Lett, 2017 Mar 24;118(12):122301.
    PMID: 28388204 DOI: 10.1103/PhysRevLett.118.122301
    Charge-dependent azimuthal particle correlations with respect to the second-order event plane in p-Pb and PbPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV have been studied with the CMS experiment at the LHC. The measurement is performed with a three-particle correlation technique, using two particles with the same or opposite charge within the pseudorapidity range |η|<2.4, and a third particle measured in the hadron forward calorimeters (4.4
    Matched MeSH terms: Ions; Heavy Ions
  6. Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, et al.
    Phys Rev Lett, 2019 Apr 19;122(15):152001.
    PMID: 31050516 DOI: 10.1103/PhysRevLett.122.152001
    The modification of jet shapes in Pb-Pb collisions, relative to those in pp collisions, is studied for jets associated with an isolated photon. The data were collected with the CMS detector at the LHC at a nucleon-nucleon center-of-mass energy of 5.02 TeV. Jet shapes are constructed from charged particles with track transverse momenta (p_{T}) above 1  GeV/c in annuli around the axes of jets with p_{T}^{jet}>30  GeV/c associated with an isolated photon with p_{T}^{γ}>60  GeV/c. The jet shape distributions are consistent between peripheral Pb-Pb and pp collisions, but are modified for more central Pb-Pb collisions. In these central Pb-Pb events, a larger fraction of the jet momentum is observed at larger distances from the jet axis compared to pp, reflecting the interaction between the partonic medium created in heavy ion collisions and the traversing partons.
    Matched MeSH terms: Ions; Heavy Ions
  7. Ying, C.K., W.A. Kamil, Matsufuji, Naruhiro
    Charged particle therapy with carbon ions has advantages over conventional radiotherapy using x-ray beams. The application of charged particle therapy has rapidly increased over the last decades. This is due to its characteristic Bragg peak which has relatively low entrance doses and favourable doses distribution. In this research work, Geant4 based Monte Carlo simulation (MC) method has been used to calculate the radiation transportation and dose distributions in tissue-like media. The main objective of the work was to compare the Geant4 simulated depth dose distributions with experimental measurements and verify the capability of the geant4 simulation toolkit. The carbon ion beams for the therapeutic energy of 350 MeV/u and 400 MeV/u respectively were simulated, with the same settings as the experimental work carried out at the treatment room at Heavy Ion Medical Accelerator (HIMAC), National Institute of Radiological Sciences (NIRS), Chiba, Japan. The simulation results were verified with measurements data. The work was to measure the accuracy and quality of the dose distributions by Geant4 MC methods. The results show that the Bragg peak and spread out Bragg peak (SOBP) distributions in simulation has fairly good agreement with measurements.
    Matched MeSH terms: Ions; Heavy Ions
  8. Aziz SB, Hamsan MH, Kadir MFZ, Karim WO, Abdullah RM
    Int J Mol Sci, 2019 Jul 09;20(13).
    PMID: 31323971 DOI: 10.3390/ijms20133369
    Solid polymer blend electrolyte membranes (SPBEM) composed of chitosan and dextran with the incorporation of various amounts of lithium perchlorate (LiClO4) were synthesized. The complexation of the polymer blend electrolytes with the salt was examined using FTIR spectroscopy and X-ray diffraction (XRD). The morphology of the SPBEs was also investigated using field emission scanning electron microscopy (FESEM). The ion transport behavior of the membrane films was measured using impedance spectroscopy. The membrane with highest LiClO4 content was found to exhibit the highest conductivity of 5.16 × 10-3 S/cm. Ionic (ti) and electronic (te) transference numbers for the highest conducting electrolyte were found to be 0.98 and 0.02, respectively. Electrochemical stability was estimated from linear sweep voltammetry and found to be up to ~2.3V for the Li+ ion conducting electrolyte. The only existence of electrical double charging at the surface of electrodes was evidenced from the absence of peaks in cyclic voltammetry (CV) plot. The discharge slope was observed to be almost linear, confirming the capacitive behavior of the EDLC. The performance of synthesized EDLC was studied using CV and charge-discharge techniques. The highest specific capacitance was achieved to be 8.7 F·g-1 at 20th cycle. The efficiency (η) was observed to be at 92.8% and remained constant at 92.0% up to 100 cycles. The EDLC was considered to have a reasonable electrode-electrolyte contact, in which η exceeds 90.0%. It was determined that equivalent series resistance (Resr) is quite low and varies from 150 to 180 Ω over the 100 cycles. Energy density (Ed) was found to be 1.21 Wh·kg-1 at the 1st cycle and then remained stable at 0.86 Wh·kg-1 up to 100 cycles. The interesting observation is that the value of Pd increases back to 685 W·kg-1 up to 80 cycles.
    Matched MeSH terms: Ions/chemistry
  9. Marimuthu K, Thilaga M, Kathiresan S, Xavier R, Mas RH
    J Food Sci Technol, 2012 Jun;49(3):373-7.
    PMID: 23729859 DOI: 10.1007/s13197-011-0418-9
    The effects of different cooking methods (boiling, baking, frying and grilling) on proximate and mineral composition of snakehead fish were investigated. The mean content of moisture, protein, fat and ash of raw fish was found to be 77.2 ± 2.39, 13.9 ± 2.89, 5.9 ± 0.45 and 0.77 ± 0.12% respectively. The changes in the amount of protein and fat were found to be significantly higher in frying and grilling fish. The ash content increased significantly whereas that of the minerals (Na, K, Ca, Mg, Fe, Zn and Mn) was not affected in all cooking methods. Increased in Cu contents and decreased in P contents were observed in all cooking methods except grilling. In the present study, the grilling method of cooking is found to be the best for healthy eating.
    Matched MeSH terms: Ions
  10. Sidik NA, Safdari A
    Nanoscale Res Lett, 2012;7(1):648.
    PMID: 23176814 DOI: 10.1186/1556-276X-7-648
    This work presents some comments concerning the paper entitled 'Lattice Boltzmann simulation of alumina-water nanofluid in a square cavity' by Yurong He, Cong Qi, Yanwei Hu, Bin Qin, Fengchen Li and Yulong Ding which was published in Nanoscale Research Letters in 2011. The comments are related to the numerical parameters and the computed results of average Nusselt number.
    Matched MeSH terms: Ions; Publications
  11. Razak IA, Usman A, Fun HK, Yamin BM, Keat GW
    Acta Crystallogr C, 2002 Feb;58(Pt 2):m122-3.
    PMID: 11828100
    In the title compound, [SbCl(2)(C(4)H(8)N(2)S)(2)]Cl, the coordination around the Sb atom can be described as distorted pseudo-octahedral. Both rings of the trimethylenethiourea ligands [alternatively 3,4,5,6-tetrahydropyrimidine-2(1H)-thione] adopt an envelope conformation. The molecules are connected into dimers in the ab plane by two intermolecular hydrogen bonds. The dimers are arranged into infinite one-dimensional chains along the a axis as a result of the Cl(-) ions forming intermolecular hydrogen bonds with three NH groups.
    Matched MeSH terms: Ions
  12. Radzi Abas M, Ahmad-Shah A, Nor Awang M
    Environ Pollut, 1992;75(2):209-13.
    PMID: 15092035
    A study was carried out to determine the chemical composition of bulk precipitation, throughfall and stemflow in an urban forest in Kuala Lumpur, Malaysia. The mean weekly rainfall recorded during the period of study was 63.2 mm. Throughfall, stemflow and canopy interception of incident precipitation were 77.1%, 1.2% and 21.7% respectively. Bulk precipitation, througfall and stemflow were acidic, the pH recorded being 4.37, 4.71 and 4.15 respectively. In all cases the dominant ions were NO3, SO4, Cl, NH4, K, Ca and Na. Of the ions studied Ca, K, Cl, SO4, Mg and Mn showed net increases in passing through the forest canopy, while NH4, Na, NO3, Zn, H and Fe showed net retention. This study shows that the urban environment of Kuala Lumpur contributes considerable amounts of materials to the atmosphere, as reflected by the high ionic contents in bulk precipitation, throughfall and stemflow.
    Matched MeSH terms: Ions
  13. Peter Michael Barling
    This paper presents the solution to a calculation of the pH of a very dilute solution of a weak acid, taking into account the effect of the hydroxonium ions generated from the ionization of the acid on the ionization of water, also a very weak acid. To be solved successfully, this calculation involves the concepts of conservation of charge, pH, equilibria and the application of the general solution to a cubic equation. Such an exercise requires the application of skills in algebra, and can provide a core of understanding that can prepare advanced students for many different sorts of calculations that represent real-life problems in the chemical sciences. A programme is presented in C++ which enables the work of students to be individualized so that each student in a class can work through a slightly different pH calculation, in such a way that a class supervisor can quickly check each student’s result for accuracy.This exercise is presented as a potential means of enabling students to undertake and master similar types of calculations involving the application of complex algebra to problems related to equilibria and solution dynamics.
    Matched MeSH terms: Ions; Pharmaceutical Solutions
  14. Nor Azah Yusof, Beyan, Appri, Md. Haron Jelas, Nor Azowa Ibrahim
    A molecularly imprinted polymer (MIP), with the ability to bind Pb(II) ion, was prepared using the non-covalent molecular imprinting methods and evaluated as a sorbent for the Pb(II) ion uptake. 4-vinylbenzoic acid was chosen as the complexing monomer. The imprinted polymer was synthesized by radical polymerization. The template (Pb(II) ions) was removed using 0.1 M HCl. As a result, the efficient adsorption was found to occur at pH 7. The result also showed the applicability of the Langmuir model for the sorption, with the maximum sorption capacity of 204.08 μg/mg.
    Matched MeSH terms: Ions
  15. Jesudason, C.G.
    ASM Science Journal, 2007;1(1):7-18.
    Molecular dynamics reaction simulation showed that the rate constant is not constant over the concentration profile of reactants and products over a fixed temperature regime, and this variation is expressed in terms of the defined reactivity coefficients. The ratio of these coefficients for the forward and backward reactions were found to equal that of the activity coefficient ratio for the product and reactant species. A theory was developed to explain kinetics in general based on these observations. Several other theorems had first to be developed, most striking of all was the inference that the excess Helmholtz free energy was the thermodynamical function which had a direct relation to these activity factors than the Gibbs free energy. The theory is applied to a class of ionic reactions which could not be rationalized using the standard Bjørn-Bjerrum theory of ionic reactions.
    Matched MeSH terms: Ions
  16. Sharif, J.M., Latiff, M.S.A., Ngadi, M.A.
    ASM Science Journal, 2007;1(2):109-128.
    Spatio-temporal datasets are a collection of datasets where data can vary in both space and time. Theoretically, such datasets can be considered as continuous and discrete. For example, specification of the function, F: Ed  T Rn, where Ed denotes d-dimensional Euclidean space, T = R* ∩ {} the domain of time and Rn an n-dimensional scalar field. Examples of such data sets include time-varying simulation results, film and videos, time-varying medical datasets, geometry models with motion or deformation, meteorological measurements, and many more. It is therefore highly desirable to use visualisation to summarize meaningful information in higher dimensional spatio-temporal datasets. Our aim is to conceive an efficient visual study to facilitate scientists in identifying temporal association among complex and chaotic atom movements in ion trajectories. An application that uses a streamline for spatial motion of ion trajectories and Colour Number Coding Scheme for temporal encoding of high degree of timeline events among mobile ions is proposed. With an anthology of the visual examples, it was revealed that this application would be beneficial for scientists to visually mine any 3D spatio-temporal dataset.
    Matched MeSH terms: Ions
  17. Chong, Chee Kheong, Vijayakumar, G., Teoh, Leong Hooi, Siti Zubaidah, A.R., Mohamed Sapian, M., Abdul Rahim, A.
    Water filters are being increasingly promoted and used in the home. There are many types of commercial water jilters available for domestic use but almost all of them employ a physical filter media and an activated substance. The study showed that water filters effectively removed suspended solids and residual chlorine. However, as far as removing colhform bacteria is concerned, in ZZ .5% of the cases, bacteria were in fact introduced into the water. And in 20% ofthe cases, the amount of bacteria introduced was “too numerous to count (TNTC)". Furthermore, water hlters can lose their ability to filter bacteria without losing their ability to filter suspended solids and residual chlorine. This highlights the necessity of some authorized body looking into the claims made by these water filter manufacturers and impose certain standards to ensure that at the very least, the water quality ofthe hltered water is not worse than the unfiltered water.
    Matched MeSH terms: Ions
  18. Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, et al.
    Phys Rev Lett, 2018 Apr 06;120(14):142302.
    PMID: 29694107 DOI: 10.1103/PhysRevLett.120.142302
    Data from heavy ion collisions suggest that the evolution of a parton shower is modified by interactions with the color charges in the dense partonic medium created in these collisions, but it is not known where in the shower evolution the modifications occur. The momentum ratio of the two leading partons, resolved as subjets, provides information about the parton shower evolution. This substructure observable, known as the splitting function, reflects the process of a parton splitting into two other partons and has been measured for jets with transverse momentum between 140 and 500 GeV, in pp and PbPb collisions at a center-of-mass energy of 5.02 TeV per nucleon pair. In central PbPb collisions, the splitting function indicates a more unbalanced momentum ratio, compared to peripheral PbPb and pp collisions.. The measurements are compared to various predictions from event generators and analytical calculations.
    Matched MeSH terms: Heavy Ions
  19. Ling I, Kumari H, Mirzamani M, Sobolev AN, Garvey CJ, Atwood JL, et al.
    Chem Commun (Camb), 2018 Sep 25;54(77):10824-10827.
    PMID: 30140821 DOI: 10.1039/c8cc05650a
    We report on the assembly of three-fold axially compressed icosahedral arrays of the bowl shaped p-sulfonatocalix[4]arene molecules in the solid-state, intricately bound to dipicolinate and yttrium(iii) ions, with the compression reflected in Hirshfeld surface analyses. Solution studies show dissolution of the icosahedra intact, but with a geometrical rearrangement to regular icosahedra.
    Matched MeSH terms: Ions
  20. Kim J, Sambudi NS, Cho K
    J Environ Manage, 2019 Feb 01;231:788-794.
    PMID: 30419434 DOI: 10.1016/j.jenvman.2018.10.100
    Owing to their high-risk factor, many attempts have been made to remove radionuclides from water. Sr2+ ions are the target of removal by synthesized hydroxyapatite in this research. A facile method for synthesizing high-surface-area hydroxyapatite by in-situ precipitation using excess diammonium phosphate solution and without any additive was developed. The highest surface area achieved using this method was 177.00 m2/g, and the synthesized hydroxyapatite was also mesoporous. The effects of different pH, temperatures, and ion concentrations during synthesis on the properties of the hydroxyapatite were assessed, and it was found that a low temperature and high pH were optimal for synthesizing high-surface-area hydroxyapatite. The maximum strontium removal capacity of 28.51 mg/g was achieved when the pH-7.5 solution was used. This performance is competitive in comparison with previously developed synthesized materials. Synthesized hydroxyapatite could effectively remove radioactive strontium from an aqueous solution for nuclear waste management.
    Matched MeSH terms: Ions
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