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Rahman, Mizanur,Islam, Mahmuda,Islam, Rofiqul,Sobuj, Norul Alam Institute of Forest Science 2017 Journal of Forest Science Vol.33 No.4
Tropical forests constitute almost half of the global forest cover, account for 35% of the global net primary productivity and thereby have potential to contribute substantially to sequester atmospheric $CO_2$ and offset climate change impact. However, deforestation and degradation lead by unsustainable management of tropical forests contribute to the unprecedented species losses and limit ecosystem services including carbon sequestration. Sustainable forest management (SFM) in the tropics may tackle and rectify such deleterious impacts of anthropogenic disturbances and climatic changes. However, the existing dilemma on the definition of SFM and lack of understanding of how tropical forest sustainability can be achieved lead to increasing debate on whether climate change mitigation initiatives would be successful. We reviewed the available literature with a view to clarify the concept of sustainability and provide with a framework towards the sustainability of tropical forests for enhanced carbon stock and climate change mitigation. We argue that along with securing forest tenure and thereby reducing deforestation, application of reduced impact logging (RIL) and appropriate silvicultural system can enhance tropical forest carbon stock and help mitigate climate change.
Rahman, Mohammad Mizanur,Lee, Won-Ki Wiley Subscription Services, Inc., A Wiley Company 2009 Journal of applied polymer science Vol.114 No.6
<P>Three series of isocyanate-reactive waterborne polyurethane adhesives were prepared with various contents of chain extender (4.25/8.25/12.50 mol %) and polyol (20.75/16.75/12.50 mol %). Each series had a fixed amount of excess (residual) NCO group (0.50–2.00 mol %). FTIR and <SUP>1</SUP>H-NMR spectroscopy identified the formation of urea crosslink structure mainly above 80°C of various cure temperatures (20–120°C) with excess diisocyanate. The molecular weight, tensile strength, Young's modulus, and adhesive strength depend on excess NCO content and cure temperature and also varied with polyol and chain extender content. The optimum cure temperature was 100°C for all the samples. The tensile strength, Young's modulus, and adhesive strength increased with increasing cure temperature above 60°C up to the optimum temperature) (100°C) and then almost leveled off. Among all the samples, the maximum values of tensile strength, Young's modulus, and adhesive strength were found with 63.22 wt % polyol, 0.93 wt % chain extender, and 1.50 mol % excess (residual) NCO content at 100°C optimum cure temperature. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009</P>
Rahman, Md. Mizanur,이영대 한국방재학회 2012 한국방재학회논문집 Vol.12 No.3
This study is based on finite element analyses performed by PLAXIS code to investigate the feasibility of modeling the effect of DCM (Deep Cement Mixing) columns in two dimension by a newly proposed method namely ‘Replacement Weighted Area’. The results of new method have been compared with the existing method of ‘Same Area Replacement Ratio’ as well as with field observations. It has been found that the ‘Replacement Weighted Area’ in plane strain element has provided reasonable predictions. In addition, a parametric study of the stability of geotextile-reinforced soil was performed in different layers of embankment with factors like the effects of tensile stiffness, number and length of reinforced layer. It has been observed that vertical settlements and lateral displacements have been reduced with increasing in tensile stiffness, number and length of reinforcement. However, over certain thresholds, number and length of geotextile did not enhance significant settlements and lateral displacements. This study is based on finite element analyses performed by PLAXIS code to investigate the feasibility of modeling the effect of DCM (Deep Cement Mixing) columns in two dimension by a newly proposed method namely ‘Replacement Weighted Area’. The results of new method have been compared with the existing method of ‘Same Area Replacement Ratio’ as well as with field observations. It has been found that the ‘Replacement Weighted Area’ in plane strain element has provided reasonable predictions. In addition, a parametric study of the stability of geotextile-reinforced soil was performed in different layers of embankment with factors like the effects of tensile stiffness, number and length of reinforced layer. It has been observed that vertical settlements and lateral displacements have been reduced with increasing in tensile stiffness, number and length of reinforcement. However, over certain thresholds, number and length of geotextile did not enhance significant settlements and lateral displacements.
<i>Ferrimonas gelatinilytica</i> sp. nov., isolated from tidal flat sediment
Rahman, Mohammad Mizanur,Cha, Chang-Jun International Union of Microbiological Societies 2013 International journal of systematic and evolutiona Vol.63 No.11
<P>A novel beige-pigmented, Gram-staining-negative, coccoid, motile and facultatively anaerobic bacteria, designated strain CJ24<SUP>T</SUP>, was isolated from the tidal flat sediment of the Yellow Sea in South Korea. Characterization of this strain was performed on the basis of polyphasic taxonomic methods. Phylogenetic analysis of the 16S rRNA and g<I>yr</I>B genes revealed that strain CJ24<SUP>T</SUP> belongs to the genus <I>Ferrimonas</I>, sharing the highest 16S rRNA gene sequence similarity of 96.9 % with <I>Ferrimonas marina</I> DSM 16917<SUP>T</SUP>. Strain CJ24<SUP>T</SUP> was able to grow optimally at 30 °C, at pH 6.0 and in the presence of 2 % NaCl (w/v). As an isoprenoid quinone, menaquinone (MK-7) was predominantly identified from this strain, while ubiquinone (Q-7) was also present as a minor component. The DNA G+C content of strain CJ24<SUP>T</SUP> was 60.2 mol%. The most abundant cellular fatty acids were C<SUB>15 : 0</SUB> iso, C<SUB>18 : 1</SUB>ω9c, C<SUB>16 : 0</SUB> and C<SUB>17 : 0</SUB> iso. Therefore, strain CJ24<SUP>T</SUP> represents a novel species in the genus <I>Ferrimonas</I> for which the name <I>Ferrimonas gelatinilytica</I> sp. nov. is proposed; the type strain is CJ24<SUP>T</SUP> ( = KACC 17065<SUP>T</SUP> = JCM 18720<SUP>T</SUP>).</P>
Rahman, Md. Habibur,Rahman, Mizanur,Kamal, Md. Mostafa,Uddin, Md. Jasim,Fardusi, Most. Jannatul,Roy, Bishwajit Institute of Forest Science 2013 Journal of Forest Science Vol.29 No.1
Present study analyzes the rooftop gardening status, floristic composition and cost and return of the rooftop garden in Sylhet City Corporation of northeastern Bangladesh. Data was collected from 450 rooftop gardeners randomly during July-September 2010. Study reveal that rooftop gardening is generally for mental satisfaction (95.3%) followed by leisure time activity (87.8%) in the study area and almost all the family members of gardeners' were involved; while collection of planting materials, sites preparation and marketing of products were reported to be carried out by males only (male 71.33%). Middle income classes were most interested in rooftop gardening (43.78%). The survey recorded 53 plant species (35 families) of which Cucurbitaceae family represented highest eight species. Shrubs (28%) were highest followed by herbs (26%) among agri-crops (36%) and flower species (30%). About 89% of the rooftop gardeners procured planting materials from nursery, market, fair, neighbor, relative and friends and they mostly prefer to use seedlings (48%) for roof gardening followed by direct seed sowing (21%). Gardeners sell products sporadically in different local markets, directly or through intermediaries, with no uniform pricing for system. Rooftop gardening improves the food security and meet nutritional deficiency to the gardeners. Survey revealed that generally very few people consider rooftop gardening commercially to get profit and from the cost-return analysis this gardening system can be economically viable if proper and scientifically managed. The study conclude that active government and NGOs could play vital role to increasing this activities by providing training and motivate people with technical aspects of rooftop gardening.
Rahman, Mohammad Mizanur,Kim, Han-Do,Lee, Won-Ki Wiley Subscription Services, Inc., A Wiley Company 2008 Journal of applied polymer science Vol.110 No.6
<P>A series of waterborne polyurethane (WBPU)/clay nanocomposite coating materials were prepared by prepolymer process with different clay contents (0–2 wt %). The study investigated surface structure as well as water resistance, thermal, mechanical, and water vapor permeability (WVP) of composite materials as a function of clay contents. The glass transition temperature of composite materials was higher than pristine WBPU and also increased with increasing clay contents. Thermal stability, and water resistance of the nanocomposite films also increased, when compared with pristine WBPU, and these properties increased with an increase in clay content. The maximum tensile strength was found with optimum clay content (1 wt %) of composite films. The WVP of coated nylon fabrics depend on the clay content and temperatures. The rate (%) of WVP of coated nylon fabrics decreased with increasing clay content at a fixed temperature. However, at a fixed clay content the WVP increased with the increase of temperatures. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008</P>