ORCID Profile
0000-0002-6778-7931
Current Organisations
Jahangirnagar University
,
Murdoch University
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Publisher: Elsevier BV
Date: 09-2022
Publisher: IEEE
Date: 08-2018
Publisher: Elsevier BV
Date: 09-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA02550A
Abstract: Transition metal nitride Ti x M 1−x−y N y (M = Al or AlSi) based thin films are evaluated as solar selective surfaces by correlating their spectral selective features with their crystal structure and chemical bonding state including mechanical strength.
Publisher: Elsevier BV
Date: 10-2018
Publisher: Elsevier BV
Date: 11-2016
Publisher: MDPI AG
Date: 05-2020
DOI: 10.3390/MA13092095
Abstract: A high number of technical elastomer products contain plasticizers for tailoring material properties. Some additives used as plasticizers pose a health risk or have inadequate material properties. Therefore, research is going on in this field to find sustainable alternatives for conventional plasticizers. In this paper, two modified bio-based plasticizers (epoxidized esters of glycerol formal from soybean and canola oil) are of main interest. The study aimed to determine the influence of these sustainable plasticizers on the properties of acrylonitrile–butadiene rubber (NBR). For comparison, the influence of conventional plasticizers, e.g., treated distillate aromatic extract (TDAE) and Mesamoll® were additionally investigated. Two types of NBR with different ratios of monomers formed the polymeric basis of the prepared elastomers. The variation of the monomer ratio results in different polarities, and therefore, compatibility between the NBR and plasticizers should be influenced. The mechanical characteristics were investigated. In parallel, dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA) were performed and filler macro-dispersion was determined. Bio-based plasticizers were shown to have better mechanical and thermal properties compared to conventional plasticizers. Further, thermo-oxidative aging was realized for 500 h, and afterwards, mechanical characterizations were done. It was observed that bio-based plasticizers have almost the same aging properties compared to conventional plasticizers.
Publisher: Elsevier BV
Date: 04-2018
Publisher: BMJ
Date: 12-12-2017
DOI: 10.1136/GUTJNL-2017-315333
Abstract: Colorectal cancer (CRC) leads to significant morbidity/mortality worldwide. Defining critical research gaps (RG), their prioritisation and resolution, could improve patient outcomes. RG analysis was conducted by a multidisciplinary panel of patients, clinicians and researchers (n=71). Eight working groups (WG) were constituted: discovery science risk prevention early diagnosis and screening pathology curative treatment stage IV disease and living with and beyond CRC. A series of discussions led to development of draft papers by each WG, which were evaluated by a 20-strong patient panel. A final list of RGs and research recommendations (RR) was endorsed by all participants. Fifteen critical RGs are summarised below: RG1 : Lack of realistic models that recapitulate tumour/tumour micro/macroenvironment RG2 : Insufficient evidence on precise contributions of genetic/environmental/lifestyle factors to CRC risk RG3 : Pressing need for prevention trials RG4 : Lack of integration of different prevention approaches RG5 : Lack of optimal strategies for CRC screening RG6 : Lack of effective triage systems for invasive investigations RG7 : Imprecise pathological assessment of CRC RG8 : Lack of qualified personnel in genomics, data sciences and digital pathology RG9 : Inadequate assessment/communication of risk, benefit and uncertainty of treatment choices RG10 : Need for novel technologies/interventions to improve curative outcomes RG11 : Lack of approaches that recognise molecular interplay between metastasising tumours and their microenvironment RG12 : Lack of reliable biomarkers to guide stage IV treatment RG13 : Need to increase understanding of health related quality of life (HRQOL) and promote residual symptom resolution RG14 : Lack of coordination of CRC research/funding RG15 : Lack of effective communication between relevant stakeholders. Prioritising research activity and funding could have a significant impact on reducing CRC disease burden over the next 5 years.
Publisher: IOP Publishing
Date: 11-2019
DOI: 10.1088/1742-6596/1351/1/012101
Abstract: Graphene Nanosheets (GNs) have been successfully added to the palm oil fuel ash (POFA) based geopolymer with KOH activator to improve the geopolymer compressive strength. The graphene was synthesized using turbulence assisted shear exfoliation (TASE) method and identified using Raman spectroscopy. The influence of concentrations and weight percent of graphene against the compressive strength, porosity, and morphological properties were investigated. The crystallinity phases of geopolymer and graphene were also identified using XRD. Raman spectroscopy revealed that graphene produced by TASE method had ≥ 3 layers (graphene nanosheets, GNs). Furthermore, Raman maping constructed by the intensity D band showed the graphene had different atomic arrangements at the edge (armchair and zigzag). The compressive strength and the porosity tests showed that increasing the concentration and the weight percent of graphene increased the compressive strength and reduced the porosity. The highest compressive strength and the lowest porosity (10.8 MPa and 5.92%, respectively) were exhibited by the geopolymer synthesized using 0.7 wt% graphene with concentrations of 30 mg/ml. The SEM micrographs indicated that the graphene reduced the porosity of geopolymers with a pores fulfilling mechanism due to of very small of graphene nanosheets size (∼60 - ∼80 nm).
Publisher: Bangladesh Journals Online (JOL)
Date: 19-04-2012
Abstract: Spinel Mn-Zn ferrites with composition MnxZn0.4Ca0.6-2xFe2+xO4, where x = 0.10, 0.15, 0.20, 0.25 and 0.30 have been prepared by conventional ceramic technique sintered at 1300 °C for 4 hours. The influence of Ca-substitution on various properties of Mn-Zn ferrites have been studied in this work. Investigations were carried out by the measurements of Curie temperature, permeability, loss tangent, Q-factor, dielectric constant and AC resistivity of the s les. Curie temperature (Tc), the real part of initial permeability (µ´), loss tangent (tan ?), and AC resistivity have been found to be decreased while the Q-factor increases with the increase in Ca-content. The frequency characteristics of the dielectric constant and AC resistivity have been found to be decreased as the frequency increases. Maxwell-Wagner interfacial type of dielectric polarization was observed with the addition of Ca-content over the entire range of frequency considered. Keywords: Spinel ferrites Sintering temperature Initial permeability Dielectric constant.© 2012 JSR Publications. ISSN: 2070-0237 (Print) 2070-0245 (Online). All rights reserved.doi: 0.3329/jsr.v4i2.9752 J. Sci. Res. 4 (2), 297-306 (2012)
Publisher: Elsevier BV
Date: 2019
Publisher: Elsevier BV
Date: 11-2020
Publisher: MDPI AG
Date: 13-11-2018
DOI: 10.3390/INFRASTRUCTURES3040050
Abstract: To facilitate the possible technology and demand changes in a renewable-energy dominated future energy system, an integrated approach that involves Renewable Energy Sources (RES)-based generation, cutting-edge communication strategies, and advanced Demand Side Management (DSM) is essential. A Home Energy Management System (HEMS) with integrated Demand Response (DR) programs is able to perform optimal coordination and scheduling of various smart appliances. This paper develops an advanced DSM framework for microgrids, which encompasses modeling of a microgrid, inclusion of a smart HEMS comprising of smart load monitoring and an intelligent load controller, and finally, incorporation of a DR strategy to reduce peak demand and energy costs. Effectiveness of the proposed framework is assessed through a case study analysis, by investigation of DR opportunities and identification of energy savings for the developed model on a typical summer day in Western Australia. From the case study analysis, it is evident that a maximum amount of 2.95 kWh energy can be shifted to low demand periods, which provides a total daily energy savings of 3%. The total energy cost per day is AU$2.50 and AU$3.49 for a house with and without HEMS, respectively. Finally, maximum possible peak shaving, maximum shiftable energy, and maximum standby power losses and energy cost savings with or without HEMS have been calculated to identify the energy saving opportunities of the proposed strategy for a microgrid of 100 houses with solar, wind, and a back-up diesel generator in the generation side.
Publisher: IOP Publishing
Date: 18-05-2017
Publisher: American Scientific Publishers
Date: 06-2013
Publisher: Wiley
Date: 17-08-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6RA25626K
Abstract: The annealing temperature (200–500 °C) effects of optical frequency response on the dielectric functions of sol–gel derived CuCoO x thin film coatings: experimental and modelling.
Publisher: Elsevier BV
Date: 06-2019
Publisher: Elsevier BV
Date: 05-2018
Publisher: Springer Science and Business Media LLC
Date: 10-09-2022
Publisher: Elsevier BV
Date: 04-2021
Publisher: Elsevier BV
Date: 07-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7RA00342K
Abstract: Cr 1−x Al x N coatings, synthesised by an unbalanced magnetic sputtering system, showed improved microstructure and mechanical properties for ∼14–21% Al content.
Publisher: Elsevier BV
Date: 03-2016
Publisher: Informa UK Limited
Date: 02-11-2019
Publisher: Elsevier BV
Date: 05-2021
Publisher: Elsevier BV
Date: 09-2020
Publisher: Public Library of Science (PLoS)
Date: 02-06-2011
Publisher: Elsevier BV
Date: 12-2014
Publisher: Elsevier BV
Date: 06-2016
Publisher: IOP Publishing
Date: 04-2018
Publisher: Springer Science and Business Media LLC
Date: 14-04-2019
Publisher: Wiley
Date: 18-11-2020
DOI: 10.1111/JFD.13304
Publisher: No publisher found
Date: 2013
Publisher: Springer Science and Business Media LLC
Date: 04-04-2017
Publisher: IEEE
Date: 12-2019
Publisher: IEEE
Date: 12-2016
Publisher: Elsevier BV
Date: 02-2022
Publisher: Elsevier BV
Date: 10-2017
Publisher: Elsevier BV
Date: 09-2021
Publisher: Elsevier BV
Date: 08-2021
Publisher: Elsevier BV
Date: 03-2020
Publisher: Wiley
Date: 06-2013
DOI: 10.1890/12-1213.1
Abstract: Human-induced changes in anthropogenic landscapes are a predominant threat to bio ersity and have been documented to affect mutualistic interactions between plants and animals, such as avian seed dispersal. Interactions between fleshy-fruited plants and frugivorous birds are highly seasonal in temperate ecosystems. Nevertheless, combined effects of landscape modification and seasonal variation on plant-frugivore interactions have never been assessed from a network perspective. Here, we present the first study that simultaneously investigates effects of landscape modification and seasonal variation on plant-frugivore interactions and on functional and interaction ersity of plant-frugivore networks. We recorded visitation rates of 39 frugivorous bird species to 28 fruiting-plant species in Central Germany from early summer to late autumn in hedgerows within three landscape types arranged along a gradient of decreasing anthropogenic modification and increasing structural ersity (i.e., farmland, orchard, forest edge). We analyzed how species richness, abundance, and community composition, as well as functional and interaction ersity of fruiting plants and frugivorous birds changed with landscape type, fruit availability, and season. We found that visitation rates of frugivorous birds were lower in farmland, but only in summer. In autumn, visitation rates were similar in all landscape types and strongly increased with increasing local fruit availability. The functional ersity of fruits and frugivorous birds and their interaction ersity remained surprisingly constant in all landscape types. Due to seasonal changes in communities of fruiting plants and frugivorous birds, functional dispersion of fruiting plants was lower in autumn than in summer, whereas functional richness and dispersion of frugivorous birds was higher in autumn than in summer. Our results indicate that seasonal changes in fruit availability influence the abundance of frugivorous birds along gradients of structural ersity at the landscape scale. Although seasonal fluctuations influenced the functional ersity of avian frugivore communities, we found constant interaction ersity of plant-frugivore networks in space and time, probably due to the functional redundancy of frugivorous birds. These findings indicate a high robustness of avian frugivory to moderate levels of human-induced landscape modification in temperate ecosystems and call for studies testing the generality of these findings for ultimate avian seed dispersal functions.
Publisher: Elsevier BV
Date: 06-2016
Publisher: Bangladesh Journals Online (JOL)
Date: 14-12-2012
Abstract: Polycrystalline spinel MgxZn0.3Cu0.7-2xFe2+xO4, where x = 0.10, 0.20, 0.25, 0.30 and 0.35 ferrites (hereafter abbreviated as Mg-Zn) have been prepared by conventional double sintering technique. The s les were sintered at 1250°C in air for 6 hours. Measurements have been done at temperature and frequency ranges of 0 - 350°C and 0 - 500 kHz, respectively. In this work, some extrinsic magnetic properties such as Curie temperature, initial permeability, loss factor, quality factor, dielectric constant and resistivity of the s les have been studied. The Curie temperature and loss tangent of the s les decreased with increase in Cu-content whereas permeability, Qfactor, resistivity and dielectric constant have been noticed to be increased with the increase in Cucontent. The decrease in Curie temperature related to fact of weakening the strength of exchange AB interaction. Maxwell-Wagner type of interfacial polarization might have found correlated with the normal dielectric behavior of the s les, however no relaxation peaks were observed in the dielectric dispersion curves of the Mg-Zn s les in virgin state or doped state. DOI: 0.3329/jbas.v36i2.12963 Journal of Bangladesh Academy of Sciences, Vol. 36, No. 2, 199-212, 2012
Publisher: Elsevier BV
Date: 11-2022
Publisher: Elsevier BV
Date: 04-2017
Publisher: Springer Science and Business Media LLC
Date: 06-02-2020
Publisher: Elsevier BV
Date: 06-2021
Publisher: Elsevier BV
Date: 06-2022
Publisher: IEEE
Date: 09-2019
Publisher: IEEE
Date: 11-2018
Publisher: IOSR Journals
Date: 2013
DOI: 10.9790/4861-0453035
Publisher: American Scientific Publishers
Date: 03-2013
Publisher: Springer Science and Business Media LLC
Date: 05-09-2012
Publisher: Elsevier BV
Date: 06-2022
Publisher: American Scientific Publishers
Date: 12-2012
Publisher: IEEE
Date: 10-2016
Publisher: Elsevier BV
Date: 09-2021
Publisher: Elsevier BV
Date: 05-2018
Publisher: Elsevier BV
Date: 11-2017
Publisher: Elsevier BV
Date: 06-2019
Publisher: Elsevier BV
Date: 07-2018
Publisher: Elsevier BV
Date: 06-2018
Publisher: Elsevier BV
Date: 2017
Publisher: IEEE
Date: 11-2016
Publisher: Elsevier BV
Date: 10-2019
Publisher: IOP Publishing
Date: 10-2020
DOI: 10.1088/1742-6596/1655/1/012005
Abstract: The compressive strength of coal fly ash-based geopolymers has been improved by integrating the graphene nanosheets (GNs) as additive. Proximate analysis and crystal structure were also investigated using atomic absorption spectroscopy (AAS) and X-ray diffractometer. The geopolymer composites were created by mixing the solid fly ash and sand (weight ratio of 1:3) with 10 M NaOH and sodium silicate (Na 2 SiO 3 ) solutions (weight ratio of 1: 2.5), where the liquid to solid weight ratio reached an economical composition of 1: 4. Low-cost GNs with various concentrations of 5 – 20 mg/ml was then added to the mixtures. The prepared mixtures were poured into mortar molds and allowed to stand for few hours at room temperature before heat treatment (curing) in the oven at various temperatures of 40°C, 60°C, and 80°C for 24 hours. Investigation results showed that the average compressive strength of geopolymer increased about 113.8 % or more than double compared to geopolymer without the addition of GNs. The highest compressive strength (29.5 MPa) was shown by a s le with GNs of 20 mg/mL and a curing temperature of 8°C. Meanwhile, geopolymer without GNs showed the lowest compressive strength in all curing temperatures. Proximate analysis showed that fly ash used in this work was the high calcium of type-C fly ash with the CaO content of 11.18%. XRD analysis results indicated that the GNs had integrated well in the geopolymer matrix. The presence of graphene-like structure was also detected, but it was not agglomerated with GNs. Good compressive strength and inexpensive production processes make this geopolymer very prospective for further development.
Publisher: Elsevier BV
Date: 2018
Publisher: Canadian Science Publishing
Date: 04-2020
Abstract: Accurate description of thermodynamic, structural, and electronic properties for bulk and surfaces of ceria (CeO 2 ) necessitates the inclusion of the Hubbard parameter (U) in the density functional theory (DFT) calculations to precisely account for the strongly correlated 4f electrons. Such treatment is a daunting task when attempting to draw a potential energy surface for CeO 2 -catalyzed reaction. This is due to the inconsistent change in thermo-kinetics parameters of the reaction in reference to the variation in the U values. As an illustrative ex le, we investigate herein the discrepancy in activation and reaction energies for steps underlying the partial and full hydrogenation of acetylene over the CeO 2 (111) surface. Overall, we find that both activation and reaction energies positively correlate with the increase in the U value. In addition to benchmarking against more accurate theoretical methodologies, we suggest that U values are better optimized against kinetics modelling of experimentally observed profiles of products from the catalytic-assisted system of reactions.
Publisher: Elsevier BV
Date: 12-2017
Publisher: Elsevier BV
Date: 2022
Publisher: Oxford University Press (OUP)
Date: 25-01-2014
DOI: 10.1093/HMG/DDU030
Publisher: Cambridge University Press (CUP)
Date: 07-04-2016
DOI: 10.1017/S0021859616000265
Abstract: Conservation agriculture (CA) is inadequately developed for rice-based cropping systems widely practiced in Bangladesh. The current drawback is the implementation of CA for all crops including rice ( Oryza sativa L., ecotype ‘transplanted aman’ [T. aman]) to increase rice–wheat ( Triticum aestivum L.) rotation productivity. It is important to identify the best combination of tillage types and cropping systems to achieve a high yield of component crops and improve soil health. Three tillage practices, assigned to main experimental plots [namely, zero tillage (ZT), conventional tillage using a rotary tiller (CT) and deep tillage using a chisel plough (DT)] and three different cropping systems, assigned to sub-plots [namely, WFT: wheat–fallow–T. aman, WMT: wheat–mungbean ( Vigna radiata L. Wilczek)–T. aman and WDT: wheat–dhaincha ( Sesbania rostrata )–T. aman], were tested. After 4 years, ZT under WDT and WMT significantly increased soil organic matter (SOM) at 0–150 mm depth, and these replicates also held the highest levels of total organic carbon. Soil organic carbon (C) increased at a rate of 1.17 and 1.14 t/ha/y in ZT under WDT and WMT, respectively, while CT and DT under WFT were almost unchanged. After 4 years, SOM build-up by the three-crop system (WDT and WMT) under ZT helped conserve soil moisture and improve other soil properties, such as reduction in soil strength and bulk density and increase plant available water content, thus maintaining an optimum soil water infiltration rate. Zero tillage under WMT and WDT showed significant improvements in root mass density of rice and wheat at increased soil depth. The WDT and WMT plots under DT consistently gave the highest yield followed by WDT and WMT under CT, in contrast with ZT under WMT or WDT, which showed the highest improvement in crop yields over the years. In summary, minimum soil disturbance together with incorporation of a legume/green manure crop into the rice–wheat system as well as the retention of their residues increased soil C status, improved soil properties and maximized grain yields.
Publisher: American Scientific Publishers
Date: 09-2014
Publisher: Elsevier BV
Date: 02-2023
Publisher: IOP Publishing
Date: 13-02-2018
Publisher: IEEE
Date: 07-2017
Publisher: American Chemical Society (ACS)
Date: 05-08-2014
DOI: 10.1021/JP505004P
Publisher: Elsevier BV
Date: 10-2023
Publisher: Elsevier BV
Date: 11-2020
Publisher: Elsevier BV
Date: 2013
Publisher: Springer Science and Business Media LLC
Date: 14-11-2018
Publisher: Oxford University Press (OUP)
Date: 10-11-2011
DOI: 10.1093/HMG/DDR523
Publisher: Springer Science and Business Media LLC
Date: 11-02-2015
DOI: 10.1038/NATURE14177
Publisher: Elsevier BV
Date: 2019
Publisher: Elsevier BV
Date: 12-2021
Publisher: IEEE
Date: 11-2016
Publisher: MDPI AG
Date: 02-11-2017
DOI: 10.3390/EN10111764
Publisher: Informa UK Limited
Date: 11-08-2021
No related grants have been discovered for M Mahbubur Rahman.