Papers by Mohammad Sakibul Islam
Water research, Nov 19, 2017
Faecal contamination of groundwater from pit latrines is widely perceived as a major threat to th... more Faecal contamination of groundwater from pit latrines is widely perceived as a major threat to the safety of drinking water for several billion people in rural and peri-urban areas worldwide. On the floodplains of the Ganges-Brahmaputra-Meghna delta in Bangladesh, we constructed latrines and monitored piezometer nests monthly for two years. We detected faecal coliforms (FC) in 3.3-23.3% of samples at four sites. We differentiate a near-field, characterised by high concentrations and frequent, persistent and contiguous contamination in all directions, and a far-field characterised by rare, impersistent, discontinuous low-level detections in variable directions. Far-field FC concentrations at four sites exceeded 0 and 10 cfu/100 ml in 2.4-9.6% and 0.2-2.3% of sampling events respectively. The lesser contamination of in-situ groundwater compared to water at the point-of-collection from domestic wells, which itself is less contaminated than at the point-of-consumption, demonstrates the ...
3gpp Edge-Fog Federation: Transparent 3rd-Party Authentication and Application Mobility
SSRN Electronic Journal
European Journal of Business and Management, 2014
Poultry industry is one of the most promising sectors for Bangladesh. This industry can provide v... more Poultry industry is one of the most promising sectors for Bangladesh. This industry can provide various opportunities to increase GDP growth rate plus equitable distribution through arranging food security as well as ensuring self-employment, creating purchasing power and reducing poverty at a large scale. About 44 per cent of daily human intake of animal protein comes from livestock products. The poultry industry has been supplying quality protein to the people of Bangladesh at the lowest price in the world. The study outlined major concerns focusing on the entire problems. The followings points have been finally consider as comprehensive issues; lack of quality chicks, high price of feed, marketing problem, insufficient bank loan, lack of quality vaccine, the vaccine price is very high and bird flu. It is observed that to import poultry related products huge amount of valuable foreign exchange will be spent. We have proposed for providing subsidy to the local industry and protect safeguard to the local entrepreneurs of the poultry industry.
Studies in Literature and Language, 2011
This study is designed to be an empirical study of the nature of the collaboration between three ... more This study is designed to be an empirical study of the nature of the collaboration between three NESTs and three Taiwanese teachers of English (TTEs), who are NNESTs, in elementary schools in Taiwan. The aim of this study is threefold: (a) to explore the nature of collaborative teaching by NESTs and TTEs, (b) to look into the support structures that I might have been developed during the collaboration between NESTs and TTEs, and (c) to gain insights into the experiences of NESTs and TTEs in connection with collaborative teaching in elementary school classrooms. The author wishes to build up knowledge of the practice of collaborative teaching by NESTs and NNESTs and accordingly to make viable suggestions on improving collaborative teaching of this kind.
European Journal of Business and Management, 2013
The aim of this study is to examine and evaluate the profitability and liquidity of a group of 5 ... more The aim of this study is to examine and evaluate the profitability and liquidity of a group of 5 Conventional banks in Bangladesh with a group of 5 Bangladeshi Islamic banks. The study evaluates the profitability and liquidity of two types of banking system in Bangladesh for the period of 2008 to 2012. Different financial ratios i.e. Return on Asset (ROA), Return on Equity (ROE), Profit Expense Ratio (PER), Net Profit Margin (NPM), Earnings per Share (EPS), Profit per branch, Profit per employee have been used for evaluating profitability and Loan to Deposit ratio (LDR), Loan to Assets ratio (LAR) are used for evaluating liquidity of these 2 categories banks. T-test and F-test have been used in determining the significance of the differential performance of the two groups of bank. The study found that Islamic Banks are less preferable than Conventional banks in the year 2008 and 2009 in all the profitability indicators. In 2010, Conventional banks had been more profitable than Islamic banks except ROE, PER. In 2011 and 2012, Islamic banks' profitability performance is better than that of Conventional banks in the performance indicators except EPS, Profit per Branch and Profit per Employee. However, there is no significant difference in liquidity between the two sets of banks. LAR had been constantly higher in Islamic banks in all the years though LDR had not been higher during the same period. In 2010 and 2011, Conventional Banks' LDR is higher than the Islamic Bank. The reasons are that conventional banks in Bangladesh have longer history and experience in doing banking business and hold dominating position in the financial sector with its large share in the overall financial assets of Bangladesh as compared to Islamic banks, which in true sense, started only a few years back with all letter and spirit. The study also found that Islamic Banks are less profitable having less liquidity position during 2008-2012. However, it had improved considerably in its profitability during 2011 and 2012.
Differentials in Under-Five Aged Childhood Mortality in Bangladesh by Demographic Determinants: A Review of Demographic and Health Survey
In Bangladesh, over the past few decades there has been a substantial progress in reducing infant... more In Bangladesh, over the past few decades there has been a substantial progress in reducing infant, child and under-five mortality. However, differentials in trends and patterns of mortality by the demographic determinants have not been explained elaborately. In this regard this paper reviews the Bangladesh Demographic and Health Surveys (BDHS) conducted in 1993-94, 1996-97, 1999-2000, 200, 20074 and 2011 has been which reports information on infant, child and under-five mortality in detail. The evidences reflected in BDHSs show that infant, child and under-five mortality in Bangladesh have declined steadily at least over the past years. The sex differentials in infant and child mortality been narrowed down, especially in 1-4 year age group, following an increased ratio, with the exception of the 1999-2000 and 2011 survey, which indicates faster rate of the ratio resulting in lower sex or gender differentials. In terms of mothers’ age, childhood death has been reduced but the risk of...
Phylogenetic Relationships of Varieties of Tomato (Solanum lycopersicum) using DNA Markers
Journal of Pure and Applied Microbiology
Characteristics of Chilling Symptoms of Cherry Tomato Compared to Beefsteak Tomato Harvested at Different Ripening Stages
Journal of Pure and Applied Microbiology
This study was carried out to determine the characteristics of chilling symptoms between cherry t... more This study was carried out to determine the characteristics of chilling symptoms between cherry tomato 'Unicorn' and beefsteak tomato 'Madison' and to establish the equation for chilling symptoms. Each stage of breakers, turning, pink, light red, and red maturity tomato fruits were harvested from both tomato cultivars, and they were stored at 11°C and 5°C with 85% relative humidity for 21days separately to treat chilling stress and thereafter were stored for 4 days at 20°C with the same relative humidity for returning from chilling stress. The breakers, turning and pink stages of 'Unicorn' showed a lower color a*/b* value than 'Madison' in both temperatures. In addition, tomatoes stored 11°C had better color development than tomatoes stored at 5°C in both cultivars. 'Unicorn' showed higher ion leakage than 'Madison' at both temperatures in all maturity stages. Moreover, 'Unicorn' appeared to have higher respiration rates and ethylene production than 'Madison' under chilling conditions. Also, 'Unicorn' had more sensitive reactions than 'Madison' under chilling conditions, 5°C treatments were more highly sensitive than 11°C, and lower maturity stages had higher chilling-sensitivity than higher maturity stages. Therefore, the identified characteristics of chilling symptoms, appropriate maturity stages and optimum temperature on this research could be useful for optimal fresh merchandising of cherry tomato 'Unicorn' and beefsteak tomato 'Madison'.
This study was carried out in order to determine the effect of 1-Methylcyclopropene (1-MCP) on qu... more This study was carried out in order to determine the effect of 1-Methylcyclopropene (1-MCP) on quality and storability of vine-ripened light red maturity stage of fresh consumed 'Unicorn'tomatoes during commercial handling condition. Tomatoes were harvested and treated by 1-MCP (control, 0.25, 0.50 and 1.00 ppm for 20hrs), packed by carton box (commercial size) and O2 permeability film (20,000 cc/m 2 .day .atm) and stored at 5 for ℃ 35 days with 85% relative humidity. The lower respiration and ethylene production rate of tomato were showed by 1.00 ppm 1-MCP than other treatments in carton box storage on the early storage period. In Modified Atmosphere (MA) storage tomatoes, 0.50 ppm 1-MCP showed lower carbon dioxide than other treatments on the early storage period and 0.50 ppm 1-MCP showed lower ethylene concentration than other treatments during the storage period. As storage period progressed, the fresh weight loss was significantly increased. The shelf life was prolonged of MA storage with 1-MCP compared to carton box storage with 1-MCP at 5°C stored tomatoes. The 0.50 ppm 1-MCP treated tomatoes performed higher to delay color development without showing uneven color. The higher firmness and soluble solids showed by 0.50 ppm 1-MCP and control, respectively in both carton box and MA condition tomatoes. The lower concentration (0.25 ppm) showed higher vitamin C whereas; higher concentration (1.00 ppm) showed lower pH in both cartoon box and MA condition storage tomatoes. So, 0.50 ppm 1-MCP treatment in MA storage has the positive effect to maintain visual quality and retention of firmness by delay color development as well as ripeness.
Effect of Breathable Film for Modified Atmosphere Packaging Material on the Quality and Storability of Tomato in Long Distance Export Condition
The study was carried out to investigate the effect of MA packaging materials on quality and stor... more The study was carried out to investigate the effect of MA packaging materials on quality and storability of tomato in long distance export condition. We found that the fresh weight loss in perforated film was higher than other breathable films. The fresh weight of tomato (cv ‘Madison’) packaged with breathable films, such as 5,000 cc, 10,000 cc, 20,000 cc/㎡ㆍdayㆍatm oxygen permeable films, reduced less than 0.6%, but perforated film that already being used for packaging horticultural crops showed 1.4% fresh weight loss during 5℃ storage for 20 days and then 20℃ storage for last 5 days with 85% relative humidity. The carbon dioxide and oxygen concentration in tomato packages showed proper level for MA storage in 20,000 cc/㎡ㆍdayㆍatm O₂ breathable film treatment at 5℃ storage. Although at 20℃ storage, the carbon dioxide concentration increased sharply, the oxygen concentration decreased remarkably, the change of these gases concentration was the lowest in 20,000 cc film treatment. The ethylene concentration was sharply increased at 20℃ from 21 st day to 25 th day after 5℃ storage for 20 day, and the concentration was lower in 20,000 cc film treatment among the breathable film treatments. Until 20 days, at 5℃ storage all treatments did not exceed the marketability. However, the last 5 days during at 20℃, the fruit appeared fungal rots and the quality rapidly decreased. The 20,000 cc/㎡ㆍdayㆍatm O₂ permeability treated tomato performed higher firmness (9.56 N), vitamin C (16.31 ㎎/100 gFW), and soluble solids (7 °Brix) than other breathable films at final storage day. The results suggest that the 20,000 cc/㎡ㆍdayㆍatm O₂ permeable film treatment of tomato (cv ‘Madison’) performed the highest quality and storability of tomato for long distance exporting.
Effect of Temperature on the Quality and Storability of Cherry Tomato during Commercial Handling Condition
This study was carried out in order to investigate the effect of temperature of treatment and sto... more This study was carried out in order to investigate the effect of temperature of treatment and storage on the longevity of ‘Unicorn’ tomatoes of light red maturity stage during commercial handling conditions encountered while exporting over long distances. Tomato stored at 5℃ and 11℃ temperature with 85% relative humidity by pre-treating handling temperature that was using from field to before shipment as a winter temperature 5℃, spring temperature 11℃ and summer temperature 25℃ for 3 days. On the final storage day, 25℃/11℃ (treated/stored) tomatoes showed the highest respiration and ethylene production rate; whereas the lowest respiration and ethylene production rate was found for 5℃/5℃ treated and stored tomatoes. Tomatoes treated and stored at 5℃/5℃ showed higher marketability, without evidence of fungal rot, decay or spots for 23 days. The fresh weight loss under all treatment conditions increased gradually during 5℃ and 11℃ storage temperatures. The higher firmness and soluble solids were determined from 5℃/5℃ and 5℃/11℃ treated and stored tomatoes repectively, than from others tomatoes on the final day of storage. In addition, 5℃/5℃ tomatoes showed higher vitamin C contents than tomatoes stored at other temperatures, on the final day of storage. As the ripening and storage period progressed, the titratable acidity increased, but declined (P ＜ 0.05) thereafter, due to over ripe tomatoes under all treatment conditions. These results show that 5℃/5℃ treated and stored light red maturity stages of ‘Unicorn’ tomatoes are optimum to export because they show the highest storability and marketability. Moreover, the marketability of light red maturity stage of ‘Unicorn’ tomato maintained for 2 weeks in 25℃/11℃ treated and stored temperature that might be the export temperature from Korea to Japan in summer season. This research result could be useful in helping tomato growers and exporters to get optimum market value by satisfying the buyer and consumer with a fresher product.
This study was conducted to find out the effects of cultural methods on quality and postharvest p... more This study was conducted to find out the effects of cultural methods on quality and postharvest physiology of cherry tomatoes (Lycopersicon esculentum Miller cv Unicorn). Tomatoes were grown in soil and 3 kinds of hydroponics methods using peatmoss, rockwool, and deep flow culture; supplied with the nutrient solutions of the Japanese horticultural experiment station. Light red maturity stage tomatoes were harvested and packaged with perforated film (ø 6 mm, 18 hole/m 2) for storage at 11℃ with 85% relative humidity. The tomatoes have grown in soil depict higher average fruit weight than other cultural methods and presented the highest firmness at the harvest time (0 day) and after storage (16 th day). The tomatoes growing in rockwool and peatmoss displayed higher soluble solids (°Brix), vitamin C and titratable acidity (% citric acid), respectively at the harvest time and after storage compared to other cultural methods. The respiration rate established higher in rockwool, followed by deep flow, soil, and peatmoss cultural method and it was decreased after storage in all treatments. The ethylene production rate pointed the same as a trend of respiration rate; deep flow culture and rockwool treatments indicated the highest ethylene production rate at the harvest time and after storage, but it decreased during storage as maturity advanced. As a storage period progressed, the fresh weight loss of tomatoes increased but did not exceed 1%. Therefore, for producing high quality fruits that have the high soluble solids, tomatoes may be cultivated in rockwool and peatmoss hydroponics methods. And for long-term storage, the tomatoes have grown in soil may be proper because the firmness of soil treatment expressed the highest at the harvest time and retained after storage.
Protected horticulture and Plant Factory, 2014
This study was conducted to find out the appropriate packaging materials to extend the storabilit... more This study was conducted to find out the appropriate packaging materials to extend the storability and maintain the quality of cherry tomato for modified atmosphere (MA) storage. Tomatoes were grown by hydroponic at a plastic house in Gangwon Province. Light red maturity stage tomatoes were harvested and packed with MA condition (10,000; 20,000; 40,000; 60,000; 80,000; and 100,000cc/m 2 .day.atm O 2 permeability film) and perforated film to store at 5 o C, 11 o C and 24 o C. The fresh weight loss was less than 0.6% in all non-perforated breathable films at 5 o C, 11 o C, and 24 o C, but perforated film had less than 2.93% at 5 o C, 13.29% at 11 o C and 27.24% at 24 o C. The 20,000cc at 5 o C and 11 o C, and the 40,000cc film at 24 o C balanced optimum carbon dioxide and oxygen concentration in the package to maintain quality. The 10,000cc film was appeared the significantly highest ethylene concentration at 5 o C, 11 o C, and 24 o C, this film had the lowest O 2 permeability. Visual quality, firmness, and soluble solids were maintained in 20,000cc films both at 5 o C and 11 o C, the 40,000cc film at 24 o C. There was no any trend in titratable acidity and vitamin C content of treated packed film types and temperatures at cherry tomatoes packages. Therefore, the appropriate MA condition for 5 o C and 11 o C is 20,000cc/m 2 .day.atm O 2 permeability film; for 24 o C it is 40,000cc/m 2 .day.atm O 2 permeability film because those films extended the storability through the firmness, soluble solids as well as visual quality.
Estimation of velocity and training overhead constraints for energy efficient cooperative technique in Wireless Sensor Network
2008 10th International Conference on Advanced Communication Technology, 2008
Abstract-A boundary value of the velocity of Data Gathering Node (DGN) and a critical value for t... more Abstract-A boundary value of the velocity of Data Gathering Node (DGN) and a critical value for training overhead beyond which the scheme will not be feasible for a Multiple Input Multiple Output (MIMO) based cooperative communication for energy-limited wireless sensor ...
Soil Science Society of America Journal, 2011
All rights reserved. No part of this periodical may be reproduced or transmitted in any form or b... more All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Permission for printing and for reprinting the material contained herein has been obtained by the publisher.
Soil Science Society of America Journal, 2013
All rights reserved. No part of this periodical may be reproduced or transmitted in any form or b... more All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Permission for printing and for reprinting the material contained herein has been obtained by the publisher. Identifying Soil Patterns at Different Spatial Scales with a Multi-Receiver EMI Sensor Soil Physics T o investigate the soil constitution over shallower depths, EMI soil sensors have proved their functioning. These measure the ECa, which is primarily related to soil salinity (Heilig et al., 2011), and in nonsaline soils to several soil physical properties, such as moisture content and particle-size distribution: wetter soil is more electrically conductive than drier soil and coarser soil tends to be less so than finer soil (Carroll and Oliver, 2005; Inman et al., 2002). This makes multiple ECa measurements appropriate to determine the vertical distribution of soil electrical conductivity (EC). For the quantification of vertical differences in EC from aboveground ECa measurements, empirical relations were established (Rhoades et al., 1989). Rhoades and Corwin (1981) and Slavich (1990) used multiple linear regression to correlate ECa measurements to measured EC-profiles. The obtained coefficients were used to model EC-profiles at locations were EC-measurements were unavailable. Unfortunately, these coefficients are sitespecific. McNeill (1980) presented a linear model of the EMI conductivity depth response. This approach is based on the fact that the response of ground conductivity meters at low conductivities is roughly a linear function of the EC at different depths. Corwin and Rhoades (1982) used these depth response functions to determine the EC of various depth intervals by developing linear combinations of the measurements from different coil orientations. The coefficients are selected to maximize the response of the instrument to EC in the region of interest. Cook and Walker (1992) improved this method by using optimization techniques to select coefficients that are, in a sense, optimal. Borchers et al. (1997) employed measure
Precision Agriculture, 2011
Continuous paddy rice cultivation requires fields to be flooded most of the time limiting serious... more Continuous paddy rice cultivation requires fields to be flooded most of the time limiting seriously the collection of detailed soil information. So far, no appropriate soil sensor technology for identifying soil variability of flooded fields has been reported. Therefore, the primary objective was the development of a sensing system that can float, acquire and process detailed geo-referenced soil information within flooded fields. An additional objective was to determine whether the collected apparent electrical conductivity (EC a) information could be used to support soil management at a within-field level. A floating sensing system (FloSSy) was built to record EC a using the electromagnetic induction sensor EM38, which does not require physical contact with the soil. Its feasibility was tested in an alluvial paddy field of 2.7 ha located in the Brahmaputra floodplain of Bangladesh. The high-resolution (1 9 1 m) EC a data were classified into three classes using the fuzzy k-means classification method. The variation among the classes could be attributed to differences in subsoil (0.15-0.30 m below soil surface) bulk density, with the smallest EC a values representing the lowest bulk density. This effect was attributed to differences in compaction of the plough pan due to differential puddling. There was also a significant difference in rice yield among the EC a classes, with the smallest EC a values representing the lowest yield. It was concluded that the floating sensing system allowed the collection of relevant soil information, opening potential for precision agriculture practices in flooded crop fields.
Geoderma, 2012
Mobile multi-receiver electromagnetic induction sensors provide simultaneous readings of the appa... more Mobile multi-receiver electromagnetic induction sensors provide simultaneous readings of the apparent electrical conductivity (ECa) from overlapping soil volumes. Therefore, small contrasting features can be difficult to identify because they have a limited contribution to the bulk measurement, especially if they are present in the subsoil (i.e. beneath the topsoil). Integrating ECa data from simultaneous measurements with multiple coil configurations has the potential to elucidate the variability within the soil profile as it enables modelling the electrical conductivity (EC) for distinct depth intervals. Therefore, it was our objective to develop a methodology to enhance the delineation of contrasting subsoil features, such as in-filled gullies and archaeological features. We selected a 3.5 ha study site where contrasting features were expected. A three-layered build-up was taken as the initial EC-slicing model. After varying the interface depths, the shallowest and deepest EC-depth slice showed a clear minimum of their combined variances at interface depths of 0.36 m, which corresponded to the ploughing depth, and 0.86 m. This implies that the EC-depth slice in-between these depths, contained a demonstrably higher variability. A sub-area of 0.85 ha was completely excavated to a depth of 0.7 m, revealing the subsoil features and the host material. An automated edge detection algorithm showed that the EC-depth slice was superior to any individual ECa measurement for delineating the contrasting subsoil features. Therefore, we concluded that depth slicing by integrating simultaneous ECa signals from a multi-receiver EMI sensor clearly improved the identification of subsoil features.
Geoderma, 2013
The archaeological evaluation of landscapes in the framework of developer-led archaeology is ofte... more The archaeological evaluation of landscapes in the framework of developer-led archaeology is often based on extensive trenching programmes complemented with auger surveys in wetland environments. During the archaeological evaluation of a 90 ha polder site in the northwest of Belgium, a mobile multi-receiver electromagnetic induction (EMI) survey was used as a main prospecting technique. The use of a mobile survey allowed to map the entire study area at a very fine resolution (over 25 measurements per m 2). Incorporating a multi-receiver EMI instrument enabled measuring the apparent electrical conductivity (ECa) and the apparent magnetic susceptibility (MSa) of four different soil volumes simultaneously at each location. The detailed maps provided insight into the archaeological and geomorphological features of the site. Among the detected structures were a large medieval farmstead, a palaeoriver system and a number of military remains from World War I (WWI). The vertical discrimination potential added insight into the vertical facies changes, which allowed modeling the palaeolandscape and helped determining the depth of detected medieval features. The different MSa measurements gave additional insight into the WWI structures. In this paper, we give an overview of the possibilities of combining multiple ECa measurements for interpreting vertical soil variability together with an example of the added information from simultaneously gathered MSa data. More generally, the diverse potential of multi-receiver EMI survey for geoarchaeological research is demonstrated.
Geoderma, 2013
At present, spatially very detailed data sets can be obtained about soil, landscape and crop vari... more At present, spatially very detailed data sets can be obtained about soil, landscape and crop variability. However, there is a need to select independent key properties to identify management classes needed for precise land management. In a previous study performed in the European loess belt, topsoil pH, apparent electrical conductivity (ECa) and elevation were identified as key properties. In this study we enlarged the number of soil properties by including gamma ray measurements and employed a similar methodology to a field in the sand belt of northern Europe. Based on a principal component analysis we identified the same three variables as key properties. This was surprising given the big differences in landscape topology and pedogenesis between the loess and sand areas. These three key variables were used to delineate management classes using a fuzzy k-means with extragrade classification procedure. This classification was evaluated by mapping the wheat grain yield in the year 2006. A multiple regression model could be constructed that predicted yield from ECa and elevation well (R adj 2 = 0.88). To analyse the influence of ECa on crop yield in depth a boundary line analysis was conducted. The boundary line could be modelled with an excellent R adj 2 of 0.98. It was concluded that ECa, elevation and pH are generic key variables for the delineation of management classes of the aeolian landscapes of northwest Europe. Given its integral nature and strong relationship with crop performances, the authors plea to upgrade ECa from a "secondary" (proxy) source of information to a "primary" variable which can be used directly as a basis for detailed soil mapping of the bulk soil.
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Papers by Mohammad Sakibul Islam