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Journal of Geoscience and Environment Protection 2022年第4期10卷 82-100页

作者： md. Kabirul Islam md. Munsur rahman Department of Civil Engineering Military Institute of Science and Technology (MIST) Dhaka Bangladesh Institute of Water and Flood Management (IWFM) Bangladesh University of Engineering and Technology (BUET) Dhaka Bangladesh

The Payra is a tidal river with meandering planform in which around 6.5 km long landmass is formed naturally during the last 40 years that is selected for an establishment by the Government of Bangladesh. However, the site experiences intermittent erosion at several locations and poses threat to the newly developed infrastructures. In the present study, a Rouse type simple model is used to estimate the equilibrium profiles of suspended sediment concentration below which the system is likely to be eroded and regarded as “Sediment Deficit System, SDS” and above which the system is likely to be sedimented and regarded as “Sediment Surplus System, SSS”. The model was then tested at the study reach using the measured flow-sediment data complemented by field observation and Landsat images-based planform analysis. The analysis revealed that the residual flow-sediment regime in the study site is representing the “sediment deficit system” that causes continuous threat for erosion throughout the tidal cycles. Therefore, the availability of new landmass should not be the only criterion for the quick selection of a project site, and residual flow-sediment regime needs to consider as an additional parameter for such decision-making process.

关键词： Suspended Sediment Concentration Sediment Surplus System Sediment Deficit System Residual Flow-Sediment Regime

Soul-Searching on Performance of TV and Public Service Information Broadcast in Bangladesh

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Journalism and Mass Communication 2012年第6期2卷 684-690页

作者： md. Golam rahman University of Dhaka Dhaka Bangladesh

In Bangladesh, more than a dozen of private TV channels are operating and about 10 new channels are waiting with green signal for transmission. Bangladesh Television （BTV）, the only government owned and administered, and known as structurally a biased institution serves the audience the public service information most. At the same time it serves purposes of incumbent government. Public information （PI） broadcast means broadcasting towards public welfare which may bring about change in the betterment of life and work of people. Its main focus would be on information, education, and motivation values rather than entertainment. In case of information, dissemination, and documentation, all private TV channels in Bangladesh serve more entertainment and less public service information, whereas, BTV＇s focus is evident on more PI. The owners and operators of private channels think first of their business profit as well as pressure from government and political parties. During formulating planning and strategies or building program content, they become cautious as they fear that the government become angry and shut down the channel.

关键词： public information (PI) private channel TV contents

Functioning Hydraulic and Morphological Sustainability of River Training Works in Bangladesh

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Journal of Civil Engineering and Architecture 2013年第6期7卷 756-766页

作者： md. Mosiur rahman md. Abu Hena Mostofa Kamal md. Munsur rahman Institute of Water and Flood Management Bangladesh University of Engineering and Technology (BUET) Dhaka 1000Bangladesh Department of Civil Engineering Rajshahi University of Engineering and Technology (RUET) Rajshahi 6204 Bangladesh

River dynamics play the most vital role in the socio-economic of the country. These rivers are highly dynamic in nature which causes extensive riverbank erosion. Active river bank erosion and bed scouring, is apprehended to change the scenario, leading to loss of limited valuable land of Bangladesh. River training is being practiced in Bangladesh since 1960s but the process is very expensive especially in the Ganges and the Jamuna Rivers. Five types of river training works were selected at different reaches. Hydro-morphological characteristics of the major rivers are being evaluated not only in engineering concepts but also in socio-economic and environmental aspects. PRA （participatory rural appraisal） tools were applied to evaluate protection safety, hydraulic and hydrological connectivity, ecological and environmental characteristics, causes of failure and social acceptability. This comparative study is being carried out for closing the gap between the modem river training works and in country experience through adaptation of research findings with a view to effectively arresting river bank erosion. Sirajganj Hardpoint, Chandpur Town Protection work and Nakalia Revetment are found to be suitable and effective. A technically suitable structure may not have good social acceptance without IWRM （integrated water resource management）.

关键词： Sustainability river training works river morphology socio-economic PRA tools IWRM.

Protection of large partitioned MTDC Networks Using DC-DC converters and circuit breakers

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Protection and Control of Modern Power Systems 2016年第1期1卷 170-178页

作者： md.habibur rahman Lie Xu Liangzhong Yao University of Strathclyde GlasgowUK China Electric Power Research Institute BeijingChina.

This paper proposes a DC fault protection strategy for large multi-terminal HVDC(MTDC)network where MMC based DC-DC converter is configured at strategic locations to allow the large MTDC network to be operated interconnected but partitioned into islanded DC network zones following *** DC network zone is protected using either AC circuit breakers coordinated with DC switches or slow mechanical type DC circuit breakers to minimize the capital *** case of a DC fault event,DC-DC converters which have inherent DC fault isolation capability provide‘firewall’between the faulty and healthy zones such that the faulty DC network zone can be quickly isolated from the remaining of the MTDC network to allow the healthy DC network zones to remain *** validity of the proposed protection arrangement is confirmed using MATLAB/SIMULINK simulations.

关键词： DC circuit breaker DC-DC converter DC fault HVDC Modular multilevel converter(MMC) Network

Availability and Equality of Health Services: The Reduction of the Influence of Social Class on Obstetric Health Behavior in Northern Bangladesh

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Health 2019年第9期11卷 1186-1205页

作者： md. Bokul Hossain md. Siddiqur rahman Department of Sociology First Capital University of Bangladesh Chuadanga Bangladesh Department of Sociology University of Rajshahi Rajshahi Bangladesh

The present study attempts to examine the influence of social class (in terms of educational qualification, the occupation of the husband and monthly family income of the respondents) on obstetric health behavior (in terms of antenatal care or ANC visits, the intake of iron tablets, tetanus toxoid vaccination of mother, types of birth attendant, sources of information about obstetric health) in some suburban places of northern Bangladesh. Mix methods have been executed to conduct the present study. A total of one hundred and twenty-five (125) women who gave birth within the last two years have been selected through purposive sampling. Besides ten (10) case studies and five (5) key informants analysis have been performed in this study. As all the variables;both dependent and independent;used in this study are categorical, the Chi-square test has been used to assess the relationship between social class and obstetric health behavior. In this study, a significant association has been found between taking of iron tablets and occupation of the husband (P = 0.026);taking of iron tablets and educational qualification (P = 0.029);vaccination of mother (TT) and educational qualification (P = 0.004), whereas the association of other variables regarding social class and obstetric health behavior has been found insignificant. So the present study shows that the influence of social class on obstetric health behavior has been significantly reduced. It is evidenced that nowadays the effect of social class on obstetric health behavior has significantly faded by the availability, equality-based health services, and services through satellite clinics in the study area. Stakeholders and concerned authorities should give top priority to the findings while developing strategies to improve the condition of maternal health of Bangladesh to acquire the aims of reducing maternal mortality to less than 70 deaths per 100,000 live births.

关键词： Social Class Obstetric Health Obstetric Health Behavior (OHB) Suburban

Design of a Multiband Patch Antenna for 5G Communication Systems

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Open Journal of Antennas and Propagation 2018年第1期6卷 1-14页

作者： Atik Mahabub md. Mostafizur rahman md. Al-Amin md. Sayedur rahman md. Masud Rana Department of Electronics and Communication Engineering KUET Khulna Bangladesh Department of Electrical and Electronic Engineering KUET Khulna Bangladesh

Currently, communication system requires multiband small antennas for 5G mobile applications. Driven this motivation, this paper proposes a multiband patch antenna for Wi-Fi, WiMAX and 5G applications. The proposed antenna can effectively operate at 2.4 GHz as Wi-Fi, 7.8 GHz as WiMAX and 33.5 GHz as 5G communication purposes. The proposed antenna arrays have given directional radiation patterns, very small voltage standing wave ratio, high gain (VSWR) and directivity for each aforementioned systems operating frequency. This antenna is made for multiband purpose which can be effective for not only Wi-Fi and WiMAX but also 5G applications.

关键词： 5G Communication Systems Multiband Patch Antenna Wi-Fi and WiMAX Systems

Efficient Algorithm for Prolonging Network Lifetime of Wireless Sensor Networks

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Tsinghua Science and Technology 2011年第6期16卷 561-568页

作者： md.Nafees rahman M A Matin Department of Electrical Engineering and Computer Science North South University

One of the fundamental design challenges in designing a Wireless Sensor Network （WSN） is to maximize the network lifetime, as each sensor node of the network is equipped with a limited power battery. To overcome this challenge, different methods were developed in the last few years using such techniques as network protocols, data fusion algorithms using low power, energy efficient routing, and locating optimal sink position. This paper focuses on finding the optimal sink position. Relay nodes are introduced in conjunction with the sensor nodes to mitigate network geometric deficiencies since in most other approaches the sensor nodes close to the sink become heavily involved in data forwarding and, thus, their batteries are quickly depleted. A Particle Swarm Optimization （PSO） based algorithm is used to locate the optimal sink position with respect to those relay nodes to make the network more energy efficient. The relay nodes communicate with the sink instead of the sensor nodes. Tests show that this approach can save at least 40% of the energy and prolong the network lifetime.

关键词： wireless sensor network lifetime sensor node relay node particle swarm optimization sink

Morphological and Genetical Variability among Rhizoctonia solani Isolates Causing Sheath Blight Disease of Rice

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Rice science 2016年第1期23卷 42-50页

作者： Zakiah rahman MONI md.Ansar ALI md.Shahidul ALAM md.Asif rahman md.Rejwan BHUIYAN md.Salim MIAN Khandakar md.IFTEKHARUDDAULA md.Abdul LATIF Mohammad Ashik Iqbal KHAN Plant Breeding Division Bangladesh Rice Research Institute Director Research Bangladesh Rice Research Institute Department of Botany Rajshahi University Department of Genetics and Plant Breeding Bangabandhu Sheikh Mujibur Rahman Agricultural University Plant Pathology Division Bangladesh Rice Research Institute

Eighteen isolates of Rhizoctonia solani collected from infected rice plants in four different locations of Bangladesh were studied by using morphological characters and molecular markers. Anastomosis study with a reference isolate confirmed that all the isolates belonged to R. solani. Significant variation was observed in sclerotial size, shape and distribution. Un-weighted pair group method with arithmetic mean dendrogram constructed based on the Gower＇s general similarity coefficient showed that these isolates were grouped into four clusters at the 0.68 similarity coefficent according to morphological characters. Cluster I was a major cluster consisting of 13 isolates, while clusters Ⅱ to Ⅳ consisted of 1 or 2 isolates. Analyses by variable number of tandem repeat and amplified fragment length polymorphism markers showed that the isolates were grouped into five and three clusters at a similarity coefficient of 0.64 and 0.69, respectively. Although most of the variability was found between isolates from different regions as expected, significant variation was observed within the isolates collected from similar agro-ecological regions. Our results suggest the presence of different races of R. solani within the same local geographic regions.

关键词： rice Rhizoctonia solani fungal variability molecular marker morphological character

Nutritional Analysis and Determination of Heavy Metal Content of Some Spices from the Northern Region, Bangladesh

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Food and Nutrition Sciences 2022年第6期13卷 558-567页

作者： md. Zahidul Islam Shaikh Shahinur rahman Apurba Kumar Das md. Kamruzzaman md. Hafizur rahman Natore Agro Limited Natore Bangladesh Department of Applied Nutrition and Food Technology Islamic University Kushtia Bangladesh Khulna Medical College Hospital Khulna Bangladesh

Spices are generally consumed because of their medicinal properties, taste, and add flavor to food. Objectives: To determine the nutrient contents and heavy metals of five commonly consumed spices, namely turmeric (Curcuma longa), bay leaf (Laurus nobilis), red chili (Capsicum annuum), coriander (Coriander sativum), and black cumin (Nigella sativa) were collected from the local market of Northern zone, Bangladesh and were analyzed. Methods: Nutrient composition was assessed by proximate analysis, trace and heavy metals by atomic absorption spectrophotometry while the indophenol method was used to determine vitamin C. Result: The results revealed that spices are good sources of carbohydrate, fiber, and fat. The highest levels of carbohydrates, dietary fiber, protein, and fat were observed in turmeric (71.1%), black cumin (40.0%), red chili (16.77%), and coriander (17.8%) respectively. Vitamin C was present in trace amounts ranging from 0.04 to 0.1 mg/100g, except black cumin (35.0 mg/100g). Essential trace minerals like sodium, potassium, calcium, magnesium, and iron were significantly present in black cumin and bay leaf. Most of the heavy metal levels in the spices were appreciable amounts i.e. much lesser than the statutory safe limit approved by WHO and FAO for some of the samples. Conclusion: The current study concluded that the investigated spices are nutritionally rich, and heavy metal levels in the examined samples are safe for human consumption.

关键词： Spices Heavy Metals Nutrients Nutritional Composition Atomic Absorption Spectrophotometer

A Systematic Review Towards Big Data Analytics in Social Media

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Big Data Mining and Analytics 2022年第3期5卷 228-244页

作者： md.Saifur rahman Hassan Reza School of Electrical Engineering and Computer Science University of North DakotaGrand ForksND 58202USA

The recent advancement in internet 2.0 creates a scope to connect people worldwide using society 2.0 and web 2.0 *** new era allows the consumer to directly connect with other individuals,business corporations,and the *** are open to sharing opinions,views,and ideas on any topic in different formats out *** creates the opportunity to make the"Big Social Data"handy by implementing machine learning approaches and social data *** study offers an overview of recent works in social media,data science,and machine learning to gain a wide perspective on social media big data *** explain why social media data are significant elements of the improved data-driven decision-making *** propose and build the"Sunflower Model of Big Data"to define big data and bring it up to date with technology by combining 5 V’s and 10 *** discover the top ten social data analytics to work in the domain of social media platforms.A comprehensive list of relevant statistical/machine learning methods to implement each of these big data analytics is discussed in this work."Text Analytics"is the most used analytics in social data analysis to *** create a taxonomy on social media analytics to meet the need and provide a clear ***,techniques,and supporting data type are also discussed in this research *** a result,researchers will have an easier time deciding which social data analytics would best suit their needs.

关键词： big data social media big data analytics social media analytics text analytics image analytics audio analytics video analytics predictive analytics descriptive analytics prescriptive analytics diagnostic analytics