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Quality Assessment of Surface and Drinking Water of Nakla Paurosova, Sherpur, Bangladesh

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Advances in Microbiology 2019年第8期9卷 703-727页

作者： Sourav Sarker Shahin Mahmud Razia Sultana Ritu Biswas Partha Protim Sarkar md. Abul Munayem Nur-E-Alam md. Rayhan ali Muhammad Wasim md. Firoz ali md. Omar Faruque Fatematuz Zuhura Evamoni Department of Biotechnology and Genetic Engineering Mawlana Bhashani Science and Technology University Tangail Bangladesh Department of Biotechnology and Genetic Engineering Noakhali Science and Technology University Noakhali Bangladesh Department of Biotechnology and Genetic Engineering Bangabandhu Sheikh Mujibur Rahman Science and Technology University Gopalganj Bangladesh Department of Biotechnology Bangladesh Agricultural University Mymensingh Bangladesh

Water is one of the most vital elements of ecosystem and human being, but unfortunately nowadays, the pollution of surface and drinking water is an alarming problem. The present work deals with the assessment of physicochemical and bacteriological profile of several pond, jar and tube-well water samples to ensure its suitability for using and drinking. Total 30 samples were randomly selected and collected from Nakla Paurosova of Sherpur district by following the standard procedure. Bacteriological analysis was carried out by following the standard bacteriological methods. Most of the surface water sampling points were polluted by dumping of waste, cattle wash and were not suitable for drinking or other domestic purposes. Among three heavy metals, only Iron was detected in six tube-well water samples, one was also positive to arsenic, rest of the water bodies were negative to all of these metals. In case of most of the water bodies, different physicochemical properties were below standard limit. In pond water, the Total Viable Count (TVC) ranged from 2.7 × 107 cfu/100ml to 4.4 × 1015 cfu/100ml and Total Coliform Count (TCC) were 3.4 × 105 cfu/100ml to 4.8 × 1013 cfu/100ml, where the mean concentration of Heterotrophic Plate Count (HPC) was 2.4 × 105 cfu/100ml and 1.8 × 105 cfu/100ml in jar and tube-well water respectively. On the other hand, the Total Coliform Count of supply water was 33 cfu/100ml and tube-well water was 14 cfu/100ml. Fecal coliform was detected in all of the pond water samples, four jar and three tube-well water too. E. coli was present in all pond water samples, and also detected in 80% supply and 50% tube-well water also. Shigella spp. was found in two pond water and in one supply water, where tube-well water was free from it. Salmonella spp. was also detected in 30% of pond and 20% of supply water, whereas absent in tube-well water. 50% of pond, 40% of supply and 30% of tube-well water were contaminated with Vibrio spp. The total counts of these

关键词： Physiochemical Parameters Bacterial Load Antibiogram Public Health Nakla Paurosova

Study on the Development of Water Transport Network for Passengers in the Gulshan-Banani-HatirJheel Lake of the Capital City of Bangladesh

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Journal of Shipping and Ocean Engineering 2015年第4期5卷 195-202页

作者： md. Mashiur Rahaman Mir Tareque ali Laboni Afroz Department of Naval Architecture and Marine Engineering Bangladesh University of Engineering and Technology Dhaka-1000Bangladesh

Dhaka, the capital city of Bangladesh is one of the most overpopulated city in the world and traffic jam is the most severe and regular affliction in the daily life. Also, the existing vehicles are not sufficient in compared to the population of the city. People have to spend many hours simply sitting in the traffic jam. This lessens the productivity of people and brings sufferings to them. Gulshan-Banani-HatirJheel area is the busiest regions within the city and face severe traffic jam during working hours. These lakes are totally unused. Therefore, there is a possibility to build a waterways network for passengers transport through these lakes. This will reduce the affliction of people via reducing traffic jam. The proposed transportation networks will also preserve the natural environment of the lakes and bring a source of entertainment in the city life. Many developed cities in the world like London, New York, Paris, Venice, Shanghai etc. already have implemented waterways network inside the city and successfully made the best use of cistern side.

关键词： Water transport network passengers Gulshan-Banani-HatirJheel Lake.

An Evaluation on Antioxidant Activity, Total Phenolic and Total Flavaonoid Contents of Extracts from <i>Adina cordifolia</i>(Roxb.)

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American Journal of Plant Sciences 2015年第5期6卷 633-639页

作者： md. ali Akbar Hossain md. Selim Hossain Kaniz Fatema Benazir Ahmed Siddique Hanif Sikder md. Sohel Sarker Preeti Jain Department of Pharmaceutical Sciences North South University Bashundhara Dhaka Bangladesh Department of Pharmacy Gono Bishwabidyalay (University) Savar Dhaka Bangladesh Department of Pharmacy University of Asia Pacific Dhanmondhi Dhaka Bangladesh

In this study, in vitro antioxidant activity, total phenolic content and concentration of flavonoids of four different extracts of Adina cordifolia (Roxb.) were determined using spectrophotometric methods. Antioxidant activity of extracts was expressed as percentage of DPPH radicals’ inhibition and IC50 values (μg/ml). IC50 values ranged from 20.39 to 38.96 μg/ml. The total phenolic content ranged from 17.48 to 20.83 mg/g of dry weight of extract, expressed as gallic acid equivalents. The total flavonoid concentrations varied from 17.49 to 22.48 mg/g, expressed as quercetin equivalents. The significant linear correlation was confirmed between the values for the total phenolic content and antioxidant activity of plant extracts. Adina cordifolia (Roxb.) can be regarded as promising candidates for natural plant sources of antioxidants with high value.

关键词： Adina cordifolia Antioxidant Activity Flavonoids Total Phenolic Content DPPH

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Open Journal of Fluid Dynamics 2016年第4期6卷 279-302页

作者： Mohammed Nasir Uddin md. Yeakub ali N. M. Ridwan Zahed md. Jashim Uddin Department of Mathematics Chittagong University of Engineering & Technology Chittagong Bangladesh Department of Electrical & Electronic Engineering International Islamic University Chittagong Chittagong Bangladesh

Unsteady mixed convective boundary layer flow of viscous incompressible fluid along isothermal horizontal plate is analyzed through Similarity Solutions. The governing partial differential equations are transformed into ordinary differential equations using the similarity transformation and solved numerically along with shooting technique. The flow field for the fluid velocity, temperature and concentration at the plate surface are significantly influenced by the governing parameters such as unsteadiness parameter, permeability parameter, Prandtl number, Schmidt number and the other driving parameters. The results show that both fluid velocity and temperature decrease but no significant effect on concentration for the increasing values of Prandtl number. It is also exposed that velocity and concentration is higher at lower Schmidt number for low Prandtl fluid. Finally, the dependency of the Skin-friction co-efficient, Nusselt number and Sherwood number, which are of physical interest, are also illustrated in tabular form for the governing parameters.

关键词： Similarity Solution Unsteady Flow Mixed Convection Boundary Layer Flow Horizontal Plate Incompressible Fluid

A real-time hand-signs segmentation and classification system using fuzzy rule based RGB model and grid-pattern analysis

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Frontiers of Computer Science 2018年第6期12卷 1258-1260页

作者： Muhammad Aminur RAHAMAN Mahmood JASIM md.Haider ali Tao ZHANG md.HASANUZZAMAN Department of Computer Science and Engineering University of DhakaDhaka-1000Bangladesh Department of Automation School of Information Science &EngineeringTsinghua UniversityBeijing 100084China

Computer vision based researches of automatic hand-signs classification using simple camera based image are increasing rapidly in the present world. Hand-signs are the basic unit of the sign languages. So, successful ...

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Surface Morphology and Thermo-Electrical Energy Analysis of Polyaniline (PANI) Incorporated Cotton Fabric

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Energy Engineering 2024年第1期121卷 1-12页

作者： md.Shohan Parvez md.Mustafizur Rahman Mahendran Samykano Mohammad Yeakub ali Automotive Engineering Research Group Faculty of Mechanical and Automotive Engineering TechnologyUniversiti Malaysia Pahang Al-Sultan AbdullahPekanMalaysia Department of Textile Engineering Khulna University of Engineering&Technology(KUET)KhulnaBangladesh Centre for Research in Advanced Fluid and Processes(CARIFF) Universiti Malaysia Pahang Al-Sultan AbdullahLebuhraya Tun RazakGambangMalaysia Mechanical Engineering Programme Area Faculty of EngineeringUniversiti Teknologi BruneiBruneiDarussalam

With the exponential development in wearable electronics,a significant paradigm shift is observed from rigid electronics to flexible wearable ***(PANI)is considered as a dominant material in this sector,as it is endowed with the optical properties of both metal and ***,its widespread application got delineated because of its irregular rigid form,level of conductivity,and precise choice of *** PANI in textile materials can generate promising functionality for wearable *** research work employed a straightforward in-situ chemical oxidative polymerization to synthesize PANI on Cotton fabric surfaces with varying dopant(HCl)***-treatment using NaOH is implemented to improve the conductivity of the fabric surface by increasing the monomer *** research explores the morphological and structural analysis employing SEM,FTIR and *** surface resistivity was measured using a digital multimeter,and thermal stability is measured using *** successful polymerization,a homogenous coating layer is *** is revealed that the simple pre-treatment technique significantly reduces the surface resistivity of Cotton fabric to 1.27 kΩ/cm with increasing acid concentration and thermal *** electro-thermal energy can also reach up to 38.2°C within 50 s with a deployed voltage of 15 *** modified fabric is anticipated to be used in thermal regulation,supercapacitor,sensor,UV shielding,antimicrobial and other prospective functional applications.

关键词： Polyaniline cotton in-situ polymerization SEM TGA heating fabric

Connections with Symplectic Structures

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American Journal of Computational Mathematics 2016年第4期6卷 313-319页

作者： A. K. M. Nazimuddin md. Showkat ali Department of Electronics and Communications Engineering East West University Dhaka Bangladesh Department of Applied Mathematics University of Dhaka Dhaka Bangladesh

A charming feature of symplectic geometry is that it is at the crossroad of many other mathematical disciplines. In this article we review the basic notions with examples of symplectic structures and show the connecti... 详细信息

关键词： Connection Differential Geometry Symplectic Geometry

Study on characterization of bio-oil derived from sugarcane bagasse(Saccharum barberi)for application as biofuel

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Clean Energy 2022年第2期6卷 297-304页

作者： Syahirah Faraheen Kabir Ahmad Umi Fazara md.ali Khairuddin md.Isa Subash CBGopinath Chemical Engineering Programme Faculty of Chemical Engineering&TechnologyUniversiti Malaysia PerlisArauMalaysia Centre of Excellence for Biomass Utilization(COEBU) Universiti Malaysia PerlisArauMalaysia

Lignocellulosic biomass especially,sugarcane bagasse Saccharum barberi sp.,appears to be a more suitable material for partial substi-tution of transport fuel(diesel)than Saccharum officinarum sp.,due to its structural similarity to transport fuel(diesel).Besides that,less research has been implemented on this type of ***-oil can be implemented as biodiesel by processing it further using chemical reactions such as hydrodeoxygenation and cracking with zeolite ***,the purpose of this study is to determine the compatibility of pyrolytic bio-oil produced from Saccharum barberi *** comparison with *** *** use as transport fuel(diesel)in automotive *** purpose can be accomplished by comparing the oil’s bio-physiochemical properties for both *** experiment is conducted on a bench-scale on which bio-oil of Saccharum barberi *** secured from the catalytic pyrolysis process at a temperature of 500°C and heating rate of 50°C/min with the addition of ZSM-Zeolite *** analysis of Saccharum barberi *** that cellulose is more reactive than lignin,evidenced by the high percentage of weight loss at tem-peratures ranging from 251°C to 390°*** high contents of carbon(40.7%)and hydrogen(6.50%),as well as slight traces of sulphur(0.08%)and nitrogen(0.85%),in bio-oil(Saccharum barberi sp.)indicate that it is conceivable to be partially used for replacement in biofuel *** physiochemical properties reveal that Saccharum barberi *** more potential than *** *** chromatography-mass spectrometry analysis reveals that bio-oil consists of high amounts of aromatic hydrocarbon(26.2%),phenol(14.8%)and furfural(13.0%)in comparison to *** sp.

关键词： sugarcane bagasse catalytic pyrolysis bio-oil physiochemical characterization biofuel

Development of New Submergence Tolerant Rice Variety for Bangladesh Using Marker-Assisted Backcrossing

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Rice science 2015年第1期22卷 16-26页

作者： Khandakar md.IFTEKHARUDDAULA Helal Uddin AHMED Sharmistha GHOSAL Zakiah Rahman MONI Al AMIN md.Shamsher ali Plant Breeding Division Bangladesh Rice Research Institute

Submergence tolerant high yielding rice variety was developed using BR11 as a recipient parent applying foreground, phenotypic and background selection approaches. Recombinant selection was found essential to minimize linkage drag by BC2F2 generation. Without recombinant selection, the introgression size in the backcross recombinant lines （BRLs） was approximately 15 Mb on the carrier chromosome. The BRLs were found submergence tolerance compared to the check varieties under complete submergence for two weeks at Bangladesh Rice Research Institute, and produced higher yield compared to the isogenic Subl-line under controlled submerged condition. The BRL IR85260-66-654-Gaz2 was released as BRRI dhan52 in 2010, which was the first high yielding submergence tolerant variety in Bangladesh. BRRI dhan52 produced grain yield ranging from 4.2 to 5.2 t/hm2 under different flash flood prone areas of Bangladesh in three consecutive seasons. The study demonstrated the efficiency of recombinant selection and better adaptability of the newly released submergence tolerant high yielding variety in flash flood prone different areas of the country with respect to submergence tolerance and yield potential.

关键词： backcross recombinant line marker-assisted backcrossing recombinant selection rice submergence tolerance