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S. S. Sikder,M. A. Hakim,S. Manjura Hoque,Md. Sultan Mahmud,P. Nordblad 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
The temperature and the field dependences of the magnetization have been measured for Fe73:5-xCrxCu1Nb3Si13:5B9 (0 ≤ x ≤ 17.5) prepared by using a melt spin technique. The temperature dependence of the magnetization in the range of 5 to 300 K with an applied field of 1 Tesla for all the compositions follows the relaxation M(T) = M0(1-BT3/2 -CT5/2), which is indicative of the presence of a spin wave excitation. The saturation magnetizations at 5 and 300 K decrease linearly with Cr concentration for the entire composition range, which indicates that a simple dilution of the Fe moment takes place due to Cr substitution. The field-cooled (FC) and the zero-field-cooled (ZFC)magnetizations measured with an applied field of 1 Oe show divergences for x = 10, 12.5, 15 and 17.5, which may be attributed to the magnetic hardening at low temperatures.
M. A. Rahman,T. M. M. Mahmud,J. Kadir,R. Abdul Rahman,M. M. Begum 한국식물병리학회 2009 Plant Pathology Journal Vol.25 No.4
The efficacy of the combination of Burkholderia cepacia B23 with 0.75% chitosan and 3% calcium chloride (CaCl2) as a biocontrol treatment of anthracnose disease of papaya caused by Colletotrichum gloeosporioides, was evaluated during storage. The growth of B. cepacia B23 in papaya wounds and on fruit surfaces was not affected in presence of chitosan and CaCl2 or combination throughout the storage period. The combination of B. cepacia B23 with chitosan-CaCl2 was more effective in controlling the disease than either B. cepacia B23 or chitosan or other combination treatments both in inoculated and naturally infected fruits. Combining B. cepacia B23 with chitosan-CaCl2 gave the complete control of anthracnose infection in artificially inoculated fruits stored at 14 oC and 95% RH for 18 days, which was similar to that obtained with fungicide benocide®. Moreover, this combination offered a greater control by reducing 99% disease severity in naturally infected fruits at the end of 14 days storage at 14 oC and 95% RH and six days post ripening at 28±2oC, which was superior to that found with benocide® or other treatments tested. Thus, postharvest application of B. cepacia B23 with chitosan-CaCl2 as enhancers represents a promising alternative to synthetic fungicides for the control of anthracnose in papaya during storage.
Rahman, M.A.,Mahmud, T.M.M.,Kadir, J.,Rahman, R. Abdul,Begum, M.M. The Korean Society of Plant Pathology 2009 Plant Pathology Journal Vol.25 No.4
The efficacy of the combination of Burkholderia cepacia B23 with 0.75% chitosan and 3% calcium chloride ($CaCl_2$) as a biocontrol treatment of anthracnose disease of papaya caused by Colletotrichum gloeosporioides, was evaluated during storage. The growth of B. cepacia B23 in papaya wounds and on fruit surfaces was not affected in presence of chitosan and $CaCl_2$ or combination throughout the storage period. The combination of B. cepacia B23 with chitosan-$CaCl_2$ was more effective in controlling the disease than either B. cepacia B23 or chitosan or other combination treatments both in inoculated and naturally infected fruits. Combining B. cepacia B23 with chitosan-$CaCl_2$ gave the complete control of anthracnose infection in artificially inoculated fruits stored at $14^{\circ}C$ and 95% RH for 18 days, which was similar to that obtained with fungicide $benocide^{(R)}$. Moreover, this combination offered a greater control by reducing 99% disease severity in naturally infected fruits at the end of 14 days storage at $14^{\circ}C$ and 95% RH and six days post ripening at $28\pm2^{\circ}C$, which was superior to that found with $benocide^{(R)}$ or other treatments tested. Thus, postharvest application of B. cepacia B23 with chitosan-$CaCl_2$ as enhancers represents a promising alternative to synthetic fungicides for the control of anthracnose in papaya during storage.
Enhancement of antimicrobial properties of shoe lining leather using chitosan in leather finishing
Mahmud, Yead,Uddin, Nizam,Acter, Thamina,Uddin, Md. Minhaz,Chowdhury, A.M. Sarwaruddin,Bari, Md. Latiful,Mustafa, Ahmad Ismail,Shamsuddin, Sayed Md. Techno-Press 2020 Advances in materials research Vol.9 No.3
In this study, a chitosan based coating method was developed and applied on the shoe lining leather surface for evaluating its inhibition to bacterial and fungal attacks. At first, chitosan was prepared from raw prawn shells and then the prepared chitosan solution was applied onto the leather surface. Secondly, the characterization of the prepared chitosan and chitosan treated leather was performed by solubility test, ATR-FTIR, XRD pattern, SEM and TGA. Evaluation of antimicrobial efficacy of chitosan was assessed against two gram positive, two gram negative bacteria and a reputed fungi by agar diffusion test. The results of this study demonstrated that chitosan took place in both the surface of collagen fibres and inside the collagen matrix of crust leather. The chitosan showed strong antimicrobial activities against all the tested microorganisms and the inhibition increased with increasing percentage of chitosan. Therefore, the prepared chitosan in this study can be an environment friendly biocide, which functions simultaneously against different spoilage bacteria and fungi on the finished leather surface. Thus by using the prepared chitosan in shoe lining leather, the possibility of microbial attack during shoe wearing can be minimized which is one of the important hygienic requirements of footwear.
A Cost Effective Virtual Cluster with Hadoop Framework for Big Data Analytics
Seraj Al Mahmud Mostafa,A.B.M Moniruzzaman 보안공학연구지원센터 2015 International Journal of Database Theory and Appli Vol.8 No.6
Big data processing is currently becoming increasingly important research field in computer technology professionals due to the continuous growth of the amount of data generated by various fields. However, the processing of large-scale research data requires cluster technology infrastructure which causes huge investments for educational institutions. Hadoop is an open-source framework that allows for distributed storage and processing of very large data sets on computer clusters built from commodity hardware. This technology is being widely used for the analysis of large datasets. This paper focuses on proposes a low cost scalable hadoop virtual cluster platform and the performance of hadoop irtual cluster. We first describe the design and implementation of a virtual datacenter using hadoop framework. Then we perform a set of experiments to investigate the performance of virtual datacenter with standard datasets. For experiment and evaluation, the Cloudera's distribution of Apache Hadoop (CDH) is installed and configured on the DIU Cloud and Big Data Lab as a prototype implementation of a virtual data center and tested with 40 workstations. In this paper, we use TPC BENCHMARK ™ DS” by-Transaction Processing Performance Council (TPC) benchmarks for evaluation virtual data center performance. The contributions of this paper, is to design model and implement a cost effective elastic virtual data center with hadoop framework and resource utilizations for educational institutions to provide high performance for distributed and parallel processing; as well as, Identify the bottlenecks of this systems e.g. bandwidth of network connectivity with all nodes in the lab.
Advanced Design, Fabrication, and Applications of 3D-Printable Piezoelectric Nanogenerators
M. A. Parvez Mahmud,Partho Adhikary,Ali Zolfagharian,Scott Adams,Akif Kaynak,Abbas Z. Kouzani 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.2
Piezoelectric nanogenerator (PENG) is a leading-edge mechanical energy harvesting device used in portable power supplyand self-powered sensor systems. Advanced 3D printers have been recently used to create 3D printed (3DP) PENGs. This hasfacilitated the rapid fabrication of PENGs and their integration into wearable electronics, biomedical systems, and internetof things devices. However, researchers face several critical challenges in developing robust 3DP-PENGs that can produceadequate electrical energy for self-powered systems. Therefore, this review on 3DP-PENGs is conducted to highlight theirrecent developments and challenges. This paper presents the latest 3D-printed piezoelectric nanogenerators in terms of theirmaterials selection and functionalization, design and architecture formation, and applications including pressure sensors,fl ow sensors, microphones, and implants. Finally, crucial challenges and optimization strategies that considerably impactthe output performance of 3DP-PENGs, along with a roadmap for their future enhancement are given. It is envisioned thatthis work will help reduce the gap between 3D printing and PENG technologies and accelerate the research and developmentof 3DP-PENGs.
Fire performance curves for unprotected HSS steel column
M. Shahria Alam,A.H.M. Muntasir Billah,Shahriar Quayyum,Mahmud Ashraf,A.N.M. Rafi,Ahmad Rteil 국제구조공학회 2013 Steel and Composite Structures, An International J Vol.15 No.6
The behaviour of steel column at elevated temperature is significantly different than that atambient temperature due to its changes in the mechanical properties with temperature. Reported literaturesuggests that steel column may become vulnerable when exposed to fire condition, since its strength andcapacity decrease rapidly with temperature. The present study aims at investigating the lateral load resistanceof non-insulated steel columns under fire exposure through finite element analysis. The studied parametersinclude moment-rotation behaviour, lateral load-deflection behaviour, stiffness and ductility of columns atdifferent axial load levels. It was observed that when the temperature of the column was increased, there wasa significant reduction in the lateral load and moment capacity of the non-insulated steel columns. Moreover,it was noted that the stiffness and ductility of steel columns decreased sharply with the increase intemperature, especially for temperatures above 400°C. In addition, the lateral load capacity and the momentcapacity of columns were plotted against fire exposure time, which revealed that in fire conditions, thenon-insulated steel columns experience substantial reduction in lateral load resistance within 15 minutes offire exposure.
Comparison between basal and conventional implants as a treatment modality in atrophied ridges
Shakhawan M,Ali,Kawan S,Othman,Abduljaleel A,Samad,Payman Kh,Mahmud 대한치과이식임플란트학회 2019 The Korean Academy of Implant Dentistry Vol.38 No.2
Implant placement in severely atrophic jaws is especially challenging because of the poor quality and quantity of the future implant bed. Although various bone augmentation procedure like ridge augmentation, sinus lift these procedures are possible today but it may lead to surgical morbidity they increase the risks and costs of dental implant treatment as well as the number of necessary operations. Also sometimes the patient is not agreeing for such extensive surgical procedures, according to the well-known implantological rules for dental restorations, crestal implants are indicated in situations when an adequate amount of bone is present but basal implant a viable treatment option derives support from the basal bone area which usually remains free from the infection and less prone to resorption. This article discusses about the review literature of using basal implants and the differences that exist between basal implants and crestal implants in rehabilitation of atrophied edentulous jaws.