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The present study investigated the relationship between the transmission of COVID-19 infections and climate indicators in Dhaka, Bangladesh, using coronavirus infections data available from the Institute of Epidemiology, Disease Control and Research (IEDCR), Bangladesh. The Spearman rank correlation test was carried out to study the association of seven climate indicators, including humidity, air quality, minimum temperature, precipitation, maximum temperature, mean temperature, and wind speed with the COVID-19 outbreak in Dhaka, Bangladesh. The study found that, among the seven indicators, only two indicators (minimum temperature and average temperature) had a significant relationship with new COVID-19 cases. The study also found that air quality index (AQI) had a strong negative correlation with cumulative cases of COVID-19 in Dhaka city. The results of this paper will give health regulators and policymakers valuable information to lessen the COVID-19 spread in Dhaka and other countries around the world.
M. Mofijur; I.M. Rizwanul Fattah; A.B.M. Saiful Islam; M.N. Uddin; S.M. Ashrafur Rahman; M.A. Chowdhury; Asraful Alam; Alhaz Uddin. Relationship between Weather Variables and New Daily COVID-19 Cases in Dhaka, Bangladesh. Sustainability 2020, 12, 8319 .
AMA StyleM. Mofijur, I.M. Rizwanul Fattah, A.B.M. Saiful Islam, M.N. Uddin, S.M. Ashrafur Rahman, M.A. Chowdhury, Asraful Alam, Alhaz Uddin. Relationship between Weather Variables and New Daily COVID-19 Cases in Dhaka, Bangladesh. Sustainability. 2020; 12 (20):8319.
Chicago/Turabian StyleM. Mofijur; I.M. Rizwanul Fattah; A.B.M. Saiful Islam; M.N. Uddin; S.M. Ashrafur Rahman; M.A. Chowdhury; Asraful Alam; Alhaz Uddin. 2020. "Relationship between Weather Variables and New Daily COVID-19 Cases in Dhaka, Bangladesh." Sustainability 12, no. 20: 8319.
The rapid spread of COVID-19 has led to nationwide lockdowns in many countries. The COVID-19 pandemic has played serious havoc on economic activities throughout the world. Researchers are immensely curious about how to give the best protection to people before a vaccine becomes available. The coronavirus spreads principally through saliva droplets. Thus, it would be a great opportunity if the virus spread could be controlled at an early stage. The face mask can limit virus spread from both inside and outside the mask. This is the first study that has endeavoured to explore the design and fabrication of an antiviral face mask using licorice root extract, which has antimicrobial properties due to glycyrrhetinic acid (GA) and glycyrrhizin (GL). An electrospinning process was utilized to fabricate nanofibrous membrane and virus deactivation mechanisms discussed. The nanofiber mask material was characterized by SEM and airflow rate testing. SEM results indicated that the nanofibers from electrospinning are about 15–30 μm in diameter with random porosity and orientation which have the potential to capture and kill the virus. Theoretical estimation signifies that an 85 L/min rate of airflow through the face mask is possible which ensures good breathability over an extensive range of pressure drops and pore sizes. Finally, it can be concluded that licorice root membrane may be used to produce a biobased face mask to control COVID-19 spread.
Mohammad Asaduzzaman Chowdhury; Bengir Ahmed Shuvho; Abdus Shahid; A.K.M. Monjurul Haque; Mohammod Abul Kashem; Su Shiung Lam; Hwai Chyuan Ong; Alhaz Uddin; M. Mofijur. Prospect of biobased antiviral face mask to limit the coronavirus outbreak. Environmental Research 2020, 192, 110294 -110294.
AMA StyleMohammad Asaduzzaman Chowdhury, Bengir Ahmed Shuvho, Abdus Shahid, A.K.M. Monjurul Haque, Mohammod Abul Kashem, Su Shiung Lam, Hwai Chyuan Ong, Alhaz Uddin, M. Mofijur. Prospect of biobased antiviral face mask to limit the coronavirus outbreak. Environmental Research. 2020; 192 ():110294-110294.
Chicago/Turabian StyleMohammad Asaduzzaman Chowdhury; Bengir Ahmed Shuvho; Abdus Shahid; A.K.M. Monjurul Haque; Mohammod Abul Kashem; Su Shiung Lam; Hwai Chyuan Ong; Alhaz Uddin; M. Mofijur. 2020. "Prospect of biobased antiviral face mask to limit the coronavirus outbreak." Environmental Research 192, no. : 110294-110294.
The finite element model based on a higher-order beam theory (HBT) is the most favourable modelling technique for an accurate prediction response of steel-concrete composite beams. The higher-order beam model is achieved by taking a third-order variation of the longitudinal displacement over the beam depth for the steel and concrete layers separately. The deformable shear studs used for connecting the concrete slab with the steel girder are modelled as distributed shear springs along with the interface between these two material layers. For the implementation of finite element formulation, the field consistent technique and full numerical integration of the stiffness matrix is carried out in order to avoid any shear locking and stress oscillation problem. There are four different types of beam elements incorporated to develop models to observe an optimal number of beam element required for good convergence. The proposed model is assessed through validation and verification using existing published results and numerical results produced by detailed 2D finite element modelling of steel-concrete composite beams. The validation and verification show a very good performance of the proposed finite element models.
Alhaz Uddin; Majed Abdulrahman Alzara; Noor Mohammad; Ahmed Yosri. Convergence studies of finite element model for analysis of steel-concrete composite beam using a higher-order beam theory. Structures 2020, 27, 2025 -2033.
AMA StyleAlhaz Uddin, Majed Abdulrahman Alzara, Noor Mohammad, Ahmed Yosri. Convergence studies of finite element model for analysis of steel-concrete composite beam using a higher-order beam theory. Structures. 2020; 27 ():2025-2033.
Chicago/Turabian StyleAlhaz Uddin; Majed Abdulrahman Alzara; Noor Mohammad; Ahmed Yosri. 2020. "Convergence studies of finite element model for analysis of steel-concrete composite beam using a higher-order beam theory." Structures 27, no. : 2025-2033.
A comprehensive finite element model based on a higher-order beam theory (HBT) is developed for an accurate prediction of the response of steel–concrete composite beams with partial shear interaction. The formulation of the proposed one dimensional finite element model incorporated nonlinearities due to large deformations of the beam as well as inelastic material behaviour of its constituent components. The higher-order beam model is achieved by taking a third order variation of the longitudinal displacement over the beam depth for the steel and concrete layers separately. The deformable shear studs used for connecting the concrete slab with the steel girder are modelled as distributed shear springs along the interface between these two material layers. The Green–Lagrange strain vector is used to capture the effect of geometric nonlinearity due to large deflections. The von Mises plasticity theory with an isotropic hardening rule and a damage mechanics model are incorporated within the proposed finite element model for simulating the inelastic response of the beam materials. The nonlinear governing equations are solved by an incremental-iterative technique following the Newton–Raphson method. A dissipation based arc-length method is employed to capture the post peak response of these beams successfully. The capability of the proposed model is assessed through its validation and verification using existing experimental results and numerical results produced by detailed finite element modelling of these beams.
Alhaz Uddin; Abdul Hamid Sheikh; David Brown; Terry Bennett; Brian Uy. Geometrically nonlinear inelastic analysis of steel–concrete composite beams with partial interaction using a higher-order beam theory. International Journal of Non-Linear Mechanics 2018, 100, 34 -47.
AMA StyleAlhaz Uddin, Abdul Hamid Sheikh, David Brown, Terry Bennett, Brian Uy. Geometrically nonlinear inelastic analysis of steel–concrete composite beams with partial interaction using a higher-order beam theory. International Journal of Non-Linear Mechanics. 2018; 100 ():34-47.
Chicago/Turabian StyleAlhaz Uddin; Abdul Hamid Sheikh; David Brown; Terry Bennett; Brian Uy. 2018. "Geometrically nonlinear inelastic analysis of steel–concrete composite beams with partial interaction using a higher-order beam theory." International Journal of Non-Linear Mechanics 100, no. : 34-47.
Jie Wen; Abdul Hamid Sheikh; Alhaz Uddin; Brian Uy. Analytical model for flexural response of two-layered composite beams with interfacial shear slip using a higher order beam theory. Composite Structures 2018, 184, 789 -799.
AMA StyleJie Wen, Abdul Hamid Sheikh, Alhaz Uddin, Brian Uy. Analytical model for flexural response of two-layered composite beams with interfacial shear slip using a higher order beam theory. Composite Structures. 2018; 184 ():789-799.
Chicago/Turabian StyleJie Wen; Abdul Hamid Sheikh; Alhaz Uddin; Brian Uy. 2018. "Analytical model for flexural response of two-layered composite beams with interfacial shear slip using a higher order beam theory." Composite Structures 184, no. : 789-799.
Alhaz Uddin; Abdul Hamid Sheikh; David Brown; Terry Bennett; Brian Uy. A higher order model for inelastic response of composite beams with interfacial slip using a dissipation based arc-length method. Engineering Structures 2017, 139, 120 -134.
AMA StyleAlhaz Uddin, Abdul Hamid Sheikh, David Brown, Terry Bennett, Brian Uy. A higher order model for inelastic response of composite beams with interfacial slip using a dissipation based arc-length method. Engineering Structures. 2017; 139 ():120-134.
Chicago/Turabian StyleAlhaz Uddin; Abdul Hamid Sheikh; David Brown; Terry Bennett; Brian Uy. 2017. "A higher order model for inelastic response of composite beams with interfacial slip using a dissipation based arc-length method." Engineering Structures 139, no. : 120-134.
Alhaz Uddin; Abdul Hamid Sheikh; Terry Bennett; Brian Uy. Large deformation analysis of two layered composite beams with partial shear interaction using a higher order beam theory. International Journal of Mechanical Sciences 2017, 122, 331 -340.
AMA StyleAlhaz Uddin, Abdul Hamid Sheikh, Terry Bennett, Brian Uy. Large deformation analysis of two layered composite beams with partial shear interaction using a higher order beam theory. International Journal of Mechanical Sciences. 2017; 122 ():331-340.
Chicago/Turabian StyleAlhaz Uddin; Abdul Hamid Sheikh; Terry Bennett; Brian Uy. 2017. "Large deformation analysis of two layered composite beams with partial shear interaction using a higher order beam theory." International Journal of Mechanical Sciences 122, no. : 331-340.
This study deals with experimental investigation of strength gaining characteristics of concrete made with Portland Composite Cement (PCC) and Ordinary Portland Cement (OPC). Compressive strength of concrete is often considered as a measure to determine the rate of strength gain of concrete with age and different cement composition. Strength developments of five concrete types have been investigated in terms of cement content and curing duration. Experimental observations on 495 specimens reveal that the early age strength of PCC concrete is lower than that of OPC concrete. Based on the test results, lack of proper pozzolanic reaction in the presence of fly ash in PCC concrete strength is lower at early age. The pozzolanic activity of fly ash also contributes to the strength gain at later stages of continuous curing. This study also concludes that drying ambient conditions reduce the strength potential of PCC concrete as the secondary (pozzolanic) reaction fails to contribute to the development of strength.
Alhaz Uddin; Mohammed Jameel; Habibur Rahman Sobuz; Shahinul Islam; Noor Md. Sadiqul Hasan. Experimental study on strength gaining characteristics of concrete using Portland Composite Cement. KSCE Journal of Civil Engineering 2013, 17, 789 -796.
AMA StyleAlhaz Uddin, Mohammed Jameel, Habibur Rahman Sobuz, Shahinul Islam, Noor Md. Sadiqul Hasan. Experimental study on strength gaining characteristics of concrete using Portland Composite Cement. KSCE Journal of Civil Engineering. 2013; 17 (4):789-796.
Chicago/Turabian StyleAlhaz Uddin; Mohammed Jameel; Habibur Rahman Sobuz; Shahinul Islam; Noor Md. Sadiqul Hasan. 2013. "Experimental study on strength gaining characteristics of concrete using Portland Composite Cement." KSCE Journal of Civil Engineering 17, no. 4: 789-796.
The effect of curing condition of five different composition of Portland composite cement (PCC) and ordinary Portland cement (OPC) were investigated in this study. Compressive strength development of five different concrete types has been investigated in terms of cement content and curing duration. From the experimental observation, it is found that the early age strength of concrete made with PCC is lower than that of concrete made with OPC due to the presence of fly ash in PCC which is responsible for the pozzolanic reaction. The continued pozzolanic activity of fly ash contributes to increase strength gain at later ages at continued curing condition. It is also found that drying ambient conditions reduction of the strength potential of concrete made with PCC because the secondary (pozzolanic) reaction fails to contribute to the development of strength.
Alhaz Uddin; Mohammed Jameel; Habibur Rahman Sobuz; Noor Md. Sadiqul Hasan; Shahinul Islam; Khan Mahmud Amanat. The Effect of Curing Time on Compressive Strength of Composite Cement Concrete. Applied Mechanics and Materials 2012, 204-208, 4105 -4109.
AMA StyleAlhaz Uddin, Mohammed Jameel, Habibur Rahman Sobuz, Noor Md. Sadiqul Hasan, Shahinul Islam, Khan Mahmud Amanat. The Effect of Curing Time on Compressive Strength of Composite Cement Concrete. Applied Mechanics and Materials. 2012; 204-208 ():4105-4109.
Chicago/Turabian StyleAlhaz Uddin; Mohammed Jameel; Habibur Rahman Sobuz; Noor Md. Sadiqul Hasan; Shahinul Islam; Khan Mahmud Amanat. 2012. "The Effect of Curing Time on Compressive Strength of Composite Cement Concrete." Applied Mechanics and Materials 204-208, no. : 4105-4109.
Alhaz Uddin; Mohammed Jameel; Hashim Abdul Razak; A. B. M. Saiful Islam. Response Prediction of Offshore Floating Structure Using Artificial Neural Network. Advanced Science Letters 2012, 14, 186 -189.
AMA StyleAlhaz Uddin, Mohammed Jameel, Hashim Abdul Razak, A. B. M. Saiful Islam. Response Prediction of Offshore Floating Structure Using Artificial Neural Network. Advanced Science Letters. 2012; 14 (1):186-189.
Chicago/Turabian StyleAlhaz Uddin; Mohammed Jameel; Hashim Abdul Razak; A. B. M. Saiful Islam. 2012. "Response Prediction of Offshore Floating Structure Using Artificial Neural Network." Advanced Science Letters 14, no. 1: 186-189.
Externally bonded carbon fiber reinforced polymer (CFRP) sheet has shown excellent performance to repair, restore and increase the load-carrying capacity of RC structures. In this paper results of an experimental test are presented in which fourteen RC beams strengthened with CFRP epoxy bonded sheets in flexure and time-dependent tests are subjected to four-point bending and sustained load respectively. The test variables included different degrees of strengthening scheme and two types of sustained load for both un-cracked and cracked beams. For flexural strengthening, the increase of ultimate strength provided by CFRP was assessed by varying the layers of laminates and incorporating end anchorage. In time-dependent test, deflection reduction coefficient in concrete tension stiffening model is proposed to evaluate the stiffness of the section after cracking for RC beams. It is found that the analytical values based on effective modulus method (EMM) are in general gives conservative estimates of the experimental results.
Habibur Rahman Sobuz; Ehsan Ahmed; Norsuzailina Mohamed Sutan; Noor Md. Sadiqul Hasan; Alhaz Uddin; Jahir Uddin; Habibur Rahman Sobuz. Bending and time-dependent responses of RC beams strengthened with bonded carbon fiber composite laminates. Construction and Building Materials 2012, 29, 597 -611.
AMA StyleHabibur Rahman Sobuz, Ehsan Ahmed, Norsuzailina Mohamed Sutan, Noor Md. Sadiqul Hasan, Alhaz Uddin, Jahir Uddin, Habibur Rahman Sobuz. Bending and time-dependent responses of RC beams strengthened with bonded carbon fiber composite laminates. Construction and Building Materials. 2012; 29 ():597-611.
Chicago/Turabian StyleHabibur Rahman Sobuz; Ehsan Ahmed; Norsuzailina Mohamed Sutan; Noor Md. Sadiqul Hasan; Alhaz Uddin; Jahir Uddin; Habibur Rahman Sobuz. 2012. "Bending and time-dependent responses of RC beams strengthened with bonded carbon fiber composite laminates." Construction and Building Materials 29, no. : 597-611.
This article has been removed: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). Further to an investigation the International Conference on Advances Science and Contemporary Engineering 2012, Procedia Engineering, Volume 50, has been removed by the publisher due to insufficient assurances by the programme organisers that the professional ethical codes of publishing and standards were applied consistently. Where the copyright in individual papers was transferred to the publisher, these transfers are now considered null and void, and revert back to the authors. For author enquiries please contact: [email protected]
A.B.M. Saiful Islam; Mohammed Jameel; Alhaz Uddin; Mohd Zamin Jumaat. Competent Building Elevation for Incorporating Base Isolation in Aseismic Structure. Procedia Engineering 2012, 50, 882 -892.
AMA StyleA.B.M. Saiful Islam, Mohammed Jameel, Alhaz Uddin, Mohd Zamin Jumaat. Competent Building Elevation for Incorporating Base Isolation in Aseismic Structure. Procedia Engineering. 2012; 50 ():882-892.
Chicago/Turabian StyleA.B.M. Saiful Islam; Mohammed Jameel; Alhaz Uddin; Mohd Zamin Jumaat. 2012. "Competent Building Elevation for Incorporating Base Isolation in Aseismic Structure." Procedia Engineering 50, no. : 882-892.
Habibur Rahman Sobuz; Ehsan Ahmed; Noor Md. Sadiqul Hasan; Alhaz Uddin. Strengthening of reinforced concrete beams with U-wrapped CFRP edge strips. International Journal of Structural Engineering 2012, 3, 311 .
AMA StyleHabibur Rahman Sobuz, Ehsan Ahmed, Noor Md. Sadiqul Hasan, Alhaz Uddin. Strengthening of reinforced concrete beams with U-wrapped CFRP edge strips. International Journal of Structural Engineering. 2012; 3 (4):311.
Chicago/Turabian StyleHabibur Rahman Sobuz; Ehsan Ahmed; Noor Md. Sadiqul Hasan; Alhaz Uddin. 2012. "Strengthening of reinforced concrete beams with U-wrapped CFRP edge strips." International Journal of Structural Engineering 3, no. 4: 311.