Browsing by Author "Begum, Mahfuza"

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    Energy-dense wearing foods liquefied by germinated-wheat amylase: effects on viscosity, osmolality, macronutrients, and bacterial growth
    (1994-09) Wahed, M.A.; Mahalanabis, Dilip; Begum, Mahfuza; Rahman, M.; Islam, M.S.
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    Optimizing Wheat Growth and Yield: The Synergistic Effects of Nitrogen and Silicon Levels
    (Asian Journal of Research in Crop Science, 2024-11) Hossain, Maruf; Rana, Sohel; Nasim, Roconuzzaman; Rahaman, Sadia; Jote, Jannatul Ferdouse; Shahrin, Kazi Rifat; Begum, Mahfuza; Hasan, Ahmed Khairul
    Enhancing wheat production is essential to meet global food security needs, especially in sustainable agriculture. Among nutrient management practices, Nitrogen (N) and Silicon (Si) are known to improve growth and stress resilience in crops. However, while the individual effects of N and Si on crop performance are well-documented, limited research has explored their combined influence on wheat growth and yield. This study aimed to address this gap by evaluating the synergistic effects of N and Si fertilizer levels on wheat agronomic performance. A field experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, from November 2022 to March 2023. The experiment utilized wheat variety BWMRI 3 in a two-factor Randomized Complete Block Design (RCBD) with three replications. Treatments consisted of four N levels (0, 80, 120, and 160 kg N ha-1) and four Si levels (0, 100, 150, and 200 kg Si ha-1). Statistical analyses using R programming revealed that the combination of 120 kg N ha-1 and 150 kg Si ha-1 (N2:S2) resulted in the highest growth and yield performance, including a 48.32% increase in tiller number, 33.63% improvement in effective spikelets, 12.97% increase in 1000-grain weight, 34.54% rise in grain yield, and a 15.88% increase in biological yield compared to the control (without N and Si). The findings indicate that the combined application of 120 kg N ha-1 and 150 kg Si ha-1 significantly enhanced wheat growth and yield, suggesting that integrating these nutrient management practices is an effective strategy for optimizing wheat production, ultimately contributing to both higher yields and sustainable agriculture.
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    Synthesis, Characterization and Thermoluminescence Properties of LiCaPO4 Phosphor for Ionizing Radiation Dosimetry
    (Elsevier, 2023-12-15) Rahat, Md Raghib; Mimi, Homaira Afia; Islam, Shah Azharul; Kamruzzaman, Md.; Ferdous, Jannatul; Begum, Mahfuza; Hasnat, Md Abul; Abdul-Rashid, H.A.; Muslima, Umme; Khandaker, Mayeen Uddin; Bradley, D.A.; Al-Mamun, Md.; Rahman, A.K.M. Mizanur
    Many minerals and compounds show thermoluminescence (TL) properties but only a few of them can meet the requirements of an ideal dosimeter. Several phosphate materials have been studied for low-dose dosimetryin recent times. Among the various phosphates, ABPO4-type material shows interesting TL properties. In this study, an ABPO4-type (A = Lithium, B=Calcium) phosphor is synthesized using a modified solid-state diffusion method. Temperature is maintained below 800 °C in every step of phosphor preparation to obtain the pure phase of Lithium calcium phosphate (LiCaPO4). The purpose of this work is to synthesize LiCaPO4 using a simple method, examine its structural and luminescence properties in order to gain a deeper understanding of its TL characteristics. The general TL properties, such as TL glow curve, dose linearity, sensitivity, and fading, are investigated. Additionally, this study aims to determine various kinetic parameters through Glow Curve Deconvolution (GCD) method using the Origin Lab software together with the Chen model. XRD analysis confirmed the phase purity of the phosphor with a rhombohedral structure. Lattice parameters, unit cell volume, grain size, dislocated density, and microstrain were also calculated from XRD data. Raman analysis and Fourier Transform Infrared analysis were used to collect information about molecular bonds, vibrations, identity, and structure of the phosphor. To investigate TL properties and associated kinetic parameters, the phosphor was irradiated with 6.0 MV (photon energy) and 6.0 MeV (electron energy) from a linear accelerator for doses ranging from 0.5 Gy to 6.0 Gy. For both photon and electron energy, TL glow curves have two identical peaks near 200 °C and 240 °C.The TL glow curves for 0.5 Gy–6 Gy are deconvoluted, then fitted with the appropriate model and then calculated the kinetic parameters. Kinetic parameters such as geometric factor (μg), order of kinetics, activation energy (E), and frequency factor (s) are obtained from Chen's peak shape method. The dose against the TL intensity curve shows that the response is almost linear in the investigated dose range. For photon and electron energy, the phosphor is found to be the most sensitive at 2.0 Gy and 4.0 Gy, respectively. The phosphor shows a low fading and after 28 days of exposure, it shows a signal loss of better than 3%. The studied TL properties suggest the suitability of LiCaPO4 in radiation dosimetry and associated fields.