Sayem Ahmed, Md. Zahid Hasan, Mary MacLennan, Farzana Dorin et al.
OBJECTIVE: This study aims to estimate the technical efficiency of health systems in Asia. SETTINGS: The study was conducted in Asian countries. METHODS: We applied an output-oriented data envelopment analysis (DEA) approach to estimate the technical efficiency of the health systems in Asian countri...
Abu Reza Md. Towfiqul Islam, H. M. Touhidul Islam, Shamsuddin Shahid, Mst Khadiza Khatun et al.
Climate extremes have a significant impact on vegetation. However, little is known about vegetation response to climatic extremes in Bangladesh. The association of Normalized Difference Vegetation Index (NDVI) with nine extreme precipitation and temperature indices was evaluated to identify the nexu...
Mohammad Lutful Hakim, Touhidul Alam, Ali F. Almutairi, Mohd Fais Mansor et al.
Polarization insensitive metamaterial absorbers (MA) are currently very attractive due to their unique absorption properties at different polarization angles. As a result, this type of absorber is widely used in sensing, imaging, energy harvesting, etc. This paper presents the design and characteriz...
Rezaul Azim, AKM Moinul H. Meaze, Adnan Affandi, Md. Mottahir Alam et al.
Abstract This paper presents a low-profile multi-slotted patch antenna for long term evolution (LTE) and fifth-generation (5G) communication applications. The studied antenna comprised of a stepped patch and a ground plane. To attain the required operating band, three slots have been inserted within...
H. M. Touhidul Islam, Abu Reza Md. Towfiqul Islam, Md. Abdullah-Al-Mahbub, Shamsuddin Shahid et al.
Spatiotemporal changes in six precipitation and five temperature extreme indices of Bangladesh and their linkage with nine ocean-atmospheric oscillation indices have been evaluated in this study to provide necessary information for adaptation planning and development of early warning systems. Daily ...
Md. Mominur Rahman, Md. Rezaul Islam, Mohammad Touhidul Islam, Md. Harun-Or-Rashid et al.
Neurodegenerative diseases are a global health issue with inadequate therapeutic options and an inability to restore the damaged nervous system. With advances in technology, health scientists continue to identify new approaches to the treatment of neurodegenerative diseases. Lost or injured neurons ...
Mohammad Kamruzzaman, Shahriar Wahid, Shamsuddin Shahid, Edris Alam et al.
Understanding spatiotemporal variability in precipitation and temperature and their future projections is critical for assessing environmental hazards and planning long-term mitigation and adaptation. In this study, 18 Global Climate Models (GCMs) from the most recent Coupled Model Intercomparison P...
Mohammad Lutful Hakim, Abu Hanif, Touhidul Alam, Mohammad Tariqul Islam et al.
This article presents numerical analysis of an ultrathin concentric hexagonal ring resonator (CHRR) metamaterial absorber (MMA) for ultrawideband visible and infrared optical window applications. The proposed MMA exhibits an absorption of above 90% from 380 to 2500 nm and an average absorbance of 96...
Mohammad Lutful Hakim, Touhidul Alam, Mohammad Tariqul Islam, Mohd Hafiz Baharuddin et al.
The development of metamaterial absorbers has become attractive for various fields of application, such as sensing, detectors, wireless communication, antenna design, emitters, spatial light modulators, etc. Multiband absorbers with polarization insensitivity have drawn significant attention in micr...
Touhidul Alam, Ali F. Almutairi, Md Samsuzzaman, Mengu Cho et al.
Abstract This research article presents a design and performance analysis of a metamaterial inspired ultra-high frequency (UHF) compact planar patch antenna for the CubeSat communication system that could be smoothly integrated with commercially available 2U Cube Satellite structure and onboard subs...
Hasibul Hasan, AKM Shahariar Azad Rabby, Mohammad Touhidul Islam, Syed Akhter Hossain
Student performance prediction is very important to understand a student progress rate. It is said that `Prevention is better than the cure'. In this Research, we are trying to find out student's current status and predict his/her future results. After the outcome, teachers can give him/her proper a...
Md Moniruzzaman, Mohammad Tariqul Islam, Norbahiah Misran, Md Samsuzzaman et al.
Abstract An inductively tuned modified split-ring resonator-based metamaterial (MTM) is presented in this article that provides multiple resonances covering S, C, X, and Ku-bands. The MTM is designed on an FR-4 substrate with a thickness of 1.5 mm and an electrical dimension of 0.063λ × 0.063λ where...
Mohammad Lutful Hakim, Touhidul Alam, Md. Shabiul Islam, M. Salaheldeen M. et al.
Metamaterial absorbers are very attractive due to their significant absorption behavior at optical wavelengths, which can be implemented for energy harvesting, plasmonic sensors, imaging, optical modulators, photovoltaic detectors, etc. This paper presents a numerical study of an ultra-wide-band dou...
Ahmad Musa, Mohammad Lutful Hakim, Touhidul Alam, Mohammad Tariqul Islam et al.
The visible and infrared wavelengths are the most frequently used electromagnetic (EM) waves in the frequency spectrum; able to penetrate the atmosphere and reach Earth’s surface. These wavelengths have attracted much attention in solar energy harvesting; thermography; and infrared imaging applicati...
Mohammad Lutful Hakim, Mohammad Tariqul Islam, Touhidul Alam, Sharul Kamal Abdul Rahim et al.
This article proposes a square split-ring resonator (SSRR) metamaterial absorber (MMA) for sub-6 GHz application. The unit cell of the MMA was designed and fabricated on commercially available low-cost FR-4 substrate material with a dielectric constant o 4.3. The higher effective medium ratio (EMR) ...