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Articles by Md. Rafiqul Islam
Total Records ( 6 ) for Md. Rafiqul Islam
  Md. Rafiqul Islam , Othman O. Khalifa , Liakot Ali , Amir Azli and Mohd Zulkarnain
  The tremendous growth of telecommunication industry results the number of hand phone users increases everyday. In order to support the growing number of users, the mobile base stations can be seen in almost everywhere. This scenario has created uncomfortable feelings to the people that they may be affected by the radiations from antennas. A measurement was done at student hostels and office premises near to base stations in International Islamic University Malaysia, Gombak campus. Measured values are compared with Malaysian Communication and Multimedia Commission (MCMC), IEEE and ANSI recommendations for safety guidelines. The results are presented in this study.
  A.H.M. Zahirul Alam , Nurul Arfah , Sheroz Khan and Md. Rafiqul Islam
  Problem statement: The design of Capacitance to Voltage Converter (CVC) for capacitive sensor transducer was presented. The proposed design will reduce the size, power consumption and supply voltage of the circuit and can be used in high frequency band transducer. Approach: The design was implemented using the Operational amplifier (Op amp) and capacitive network. The circuit was simulated using the PSPICE model parameters based on standard 0.13 μm CMOS process. Results: The design was able to measure a wide range of capacitance variations for the capacitive transducer. The performance analysis of the design showed desirable performance parameters in terms of response, low power consumption and a linear output voltage within the wide range of capacitive transducer capacitance variation for the power supply voltage of 1.2 V was achieved. Conclusion/Recommendations: The output voltage of the circuit varied linearly with the variation of capacitive transducer capacitance variation. The improved converter was compact and robust for integration into capacitive measuring systems and suitable for use in environment that making use of higher frequency band.
  Jamil Hossain , Abul Awlad Khan , Md. Ariful Islam , Md. Rafiqul Islam , Md. Abdul Khayer Mian and Md. Dulal Ali Mollah
  Background and Objective: Foliar application of nitrogen (N) is an important technique in overcoming N deficit from different stresses particularly drought of wheat crop. However, the wheat crop response to foliar N are inconstant and there is limited understanding of its effects in Bangladesh. The aim of this study was to evaluate the effect of foliar spray of N on phenology, growth, yield and protein content of late sown wheat in rice-based cropping was pattern in Bangladesh. Materials and Methods: There were 10 treatments such as recommended fertilizer dose in soil (RD) with Foliar Spray (FS) of N at 40 Days After Emergence (DAE) (T1), RD with FS of N at booting stage (T2), RD with FS of N at heading stage (T3), RD with FS of N at milking stage (T4), RD with FS of N at 40 DAE and booting stage (T5), RD with FS of N at 40 DAE+heading stage and milking stage (T6), RD with FS of N at 40 DAE+booting stage and milking stage (T7), RD (T8, control treatment), half RD of N (T9) and half RD of N with FS of N at booting stage (T10). The experiment was laid out in a randomized block design with three replications. Three percent urea was used for foliar spray. Data were analyzed using Analysis of variance ANOVA and mean separation was done by LSD at p = 0.05. Results: The highest dry matter (1811.41 g m–2), grain yield (4.02 t ha–1) and protein content (12.37%) were obtained from T7 treatment. Gross return, gross margin and BCR were also higher in T7 than any other treatments and the lowest BCR (2.43) was calculated in half of recommended fertilizer dose of N (T9). Conclusion: Recommended fertilizer dose with foliar spray of N at 40 DAE+booting stage and milking stage delayed the senescence which lead to lengthen the duration of reproductive phase, increasing the grain yield (28.84%) as well as protein content (29%) compare to half of recommended fertilizer dose of N.
  A.H.M. Zahirul Alam , Md. Rafiqul Islam , Sheroz Khan and Muhammad Mahbubur Rashid
  Problem statement: In this study Microelectrical Mechanical System (MEMS) switches were proposed to design a reconfigurable/multi-band antenna to replaced PIN diode switches or semiconductor switches due to lower insertion losses, good isolation, much lower intermodulation distortion, and lower power consumption. The antenna is able to operate at very high frequencies. Approach: A reconfigurable antenna that is capable to operate at several frequencies was proposed by introducing two adjacent patches along with main radiating patch and two MEMS switches. Parametric analysis of the size of the wing patches was done for finding optimum size. A comparative study was done for Alumina, SiN, GaAs and Teflon as MEMS bridge materials for finding better results in terms of return loss and number of bands. The design was performed by using 3D electromagnetic simulator HFSS considering ideal MEMS switches. Results: It was found that SiN as MEMS bridge material makes the antenna to operate at 16.76, 23.56 and 27.7 GHz in the "OFF" states and operate at 20.9 and 21.91 GHz in the "ON" states of MEMS switches. Conclusion/Recommendations: MEMS cantilever beam material played an important role for providing antenna to operate at multi-band frequencies. The proposed multiband/reconfigurable antenna can be implemented with easy fabrication process steps by the Sandwich method of fabrication.
  Mohammad Abu Sufian , Md. Rafiqul Islam , Tahmida Khanom Chowdhury , Abdur Rahman , Md. Sahab Uddin , Sabiha Ferdowsy Koly and Md. Shahid Sarwar
  Background and Objective: Medicinal plants are stockroom of phytochemical constituents used for the treatment of various ailments from the ancient era. The search for new therapeutic remedies from natural sources is an ongoing process. Therefore, the aim of this study was to examine the analgesic, anti-inflammatory, membrane stabilizing and thrombolytic activity of Atylosia scarabaeoides and Crotalaria spectabilis leaves those are widely used as folkloric medicine in Bangladesh. Materials and Methods: The analgesic and anti-inflammatory effects were assessed by using acetic acid induced writhing test and carrageenan induced paw edema test in mice respectively using aspirin and ketorolac as standards. Membrane stabilizing activity was examined by using hypotonic solution induced human erythrocyte lysis model considering aspirin as standard. In vitro thrombolytic model was used to evaluate the clot lysis effect using streptokinase as standard. One way ANOVA with Dunnett’s post hoc test was used for the statistical analysis using SPSS 20 (Chicago, IL, USA). Results: In the analgesic assay the n-hexane soluble fraction of A. scarabaeoides at 450 mg kg–1 b.wt., displayed height pain inhibitory activity, 63.72% (p<0.001). In carrageenan induced anti-inflammatory assay the highest percentage of inhibition of inflammation, 38.38% (p<0.001) was exhibited by the n- hexane soluble fraction at 450 mg mL–1 at 4th h. All the plant extracts treated for membrane stabilizing showed significant activity (p<0.001) at 1 mg mL–1. Among the two plant extracts, the n-hexane soluble fraction of C. spectabilis exhibited highest thrombolytic activity, 31.553±0.928% (p<0.001) at 10 mg mL–1. However, at 10 mg mL–1 significant (p<0.001) thrombolytic activity was also demonstrated by the ethanolic and its n-hexane soluble fraction of A. scarabaeoides and ethanolic extract of C. spectabilis. Conclusion: In this study both the plant extracts possessed effective analgesic, anti-inflammatory, membrane stabilizing and thrombolytic activities. Therefore, further research may be recommended to find the promising compound(s) of the plant parts.
  Hasibur Rahman , Sayed Mohammad Mohsin , Md. Rafiqul Islam and Mirza Hasanuzzaman
  Background and Objectives: Infested seed can be the source of the pathogen for important diseases. Healthy or pathogen-free seeds are considered as the vital factor for the desired plant population and good harvest. The aim of the study was to examine the cucurbit seed associated fungi and efficacy of salicylic acid and some fungicides against these fungi. Materials and Methods: An investigation was carried out on the seed health status of 5 selected cucurbit seeds (Sweet gourd, Cucurbita maxima ; Bottle gourd, Lagenaria siceraria ; Cucumber, Cucumis sativus ; Ridge gourd, Luffa acutangula and Snake gourd, Trichosanthes cucumerina) collected from 5 different sources of Bangladesh. Five identified (Aspergillus flavus, A. niger, Rhizophus sp., Fusarium sp., Chaetomium sp.) and 2 unidentified fungi were isolated from cucurbit seeds and evaluate the efficacy of some selected chemicals (Dithane M-45 80 WP, Autostin 50 WDG, Tilt 250 EC and salicylic acid) against these isolated fungi. Results: The dry inspection revealed that the highest percentage of infected seeds found from snake gourd species and seeds collected from source 1. Blotter method stated that the maximum incidence found by Aspergillus flavus and Rhizopus sp. in all cucurbit species and seed sources. The seeds collected from source 1 and cucumber species showed the highest germination percentage. The efficacy of chemicals varied significantly in respect of isolated and identified fungi and the highest performance was shown by Tilt 250 EC. Conclusion: It was concluded that the seed health status of cucurbits seeds were not at a satisfactory level. Proper storage management with good chemicals can also give a satisfactory result.
 
 
 
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