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Muhammad Akhyar Farrukh,Shaista Ali,Muhammad Khaleeq-ur-Rahman 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.11
Synthesis of Magnesium oxide (MgO) nanoparticles and zinc deposited magnesium oxide (Zn/MgO) nanoparticles was carried out using hydrothermal and deposition-precipitation method with the variation of 1-Propanol (organic solvent) concentration, sodium hydroxide and urea concentration. The nanoparticles were characterized by using FTIR, TGA, SEM-EDX, TEM and XRD. The photocatalytic efficiency of MgO and Zn/MgO nanoparticles was studied by degradation of 2,4,6-trinitrophenol (TNP), which is highly acute and toxic and causes skin and eyes diseases, liver malfunction and tumor formation. Photodegradation of TNP was carried out under UV irradiation and confirmed by using HPLC and GC-MS. MgO and Zn/MgO nanoparticles that were synthesized by using urea showed higher firstorder rate constant (k) value and percentage degradation as compared to nanoparticles that were synthesized using NaOH. It was observed that the concentration of solvent has direct relation with the k value of degradation of TNP.
THE BIMA PROJECT: O-C DIAGRAMS OF ECLIPSING BINARY SYSTEMS
HAANS, G.K.,RAMADHAN, D.G.,AKHYAR, S.,AZALIAH, R.,SUHERLI, J.,IRAWATI, P.,SAROTSAKULCHAI, T.,ARIFIN, Z.M.,RICHICHI, A.,MALASAN, H.L.,SOONTHORNTHUM, B. The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
The Eclipsing Binaries Minima (BIMA) Monitoring Project is a CCD-based photometric observational program initiated by Bosscha Observatory - Lembang, Indonesia in June 2012. Since December 2012 the National Astronomical Research Institute of Thailand (NARIT) has joined the BIMA Project as the main partner. This project aims to build an open-database of eclipsing binary minima and to establish the orbital period of each system and its variations. The project is conducted on the basis of multisite monitoring observations of eclipsing binaries with magnitudes less than 19 mag. Differential photometry methods have been applied throughout the observations. Data reduction was performed using IRAF. The observations were carried out in BVRI bands using three different small telescopes situated in Indonesia, Thailand, and Chile. Computer programs have been developed for calculating the time of minima. To date, more than 140 eclipsing binaries have been observed. From them 71 minima have been determined. We present and discuss the O-C diagrams for some eclipsing binary systems.
Mohsan Bashir,Shaista Ali,Muhammad Akhyar Farrukh 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.9
An eco-friendly and economical, green synthesis method has been employed for the synthesis of iron-oxide (Fe2O3) nanoparticles by using orange peel extract as a stabilizing agent. The thermodynamic properties were evaluated using thermogravimetric analysis-diffraction scanning calorimetry (TGA-DSC), the formation of Fe2O3 nanoparticles was confirmed using fourier transform infra-red spectroscopy (FTIR), X-Ray diffraction (XRD) and scanning electron microscopy-energy dispersive X-ray (SEM-EDX) spectroscopy. The hydrodynamic diameter was observed using a dynamic laser scattering-particle size analyser (DLS-PSA). The green synthesized nanoparticles were used to evaluate their antibacterial activity via the agar well diffusion method against gram positive (Bacillus subtilis, Staphylococcus aureusb) and gram negative (Escherichia coli., Pseudomonas aeruginosa) bacteria while keeping benzalkonium chloride, chlorhexidine, hexachlorophene and phenol as controls.
EXPANSION VELOCITY AND SPECTROSCOPIC CLASSIFICATION OF NOVA DELPHINI 2013
AZALIAH, RHISA,MALASAN, HAKIM L.,HAANS, GABRIELA K.,AKHYAR, SAEFUL The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
Low resolution spectra of Nova Delphini 2013 (V339 Del) in the optical range have been obtained at Bosscha Observatory, Indonesia during its maximum light (V = 4.3). Spectra were observed from August 16 to 27, 2013. The GAO-ITB RTS 20.3 cm telescope, and SBIG DSS-7 spectrograph and SBIG ST-7 XE as the detector have been employed throughout the observations. The spectra show P-Cygni profiles in Balmer, NaI'D' and Fe II lines, from which we determined shell expansion velocities of $1421.66{\pm}39.18km/s$, $1227.54{\pm}21.57km/s$ and 1402.86 km/s, respectively. Our spectroscopic observations followed the spectral evolution of V339 Del from the pre-maximum phase to early Orion phase. The characteristics of the nova Delphini 2013 resembles those of Fe II-type novae.