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Search Results: 1 - 10 of 9976 matches for " Shaheed Ahmed Dewan Sagar "
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Improved Self-Pruning for Broadcasting in Ad Hoc Wireless Networks  [PDF]
Raqeebir Rab, Shaheed Ahmed Dewan Sagar, Nazmus Sakib, Ahasanul Haque, Majedul Islam, Ashikur Rahman
Wireless Sensor Network (WSN) , 2017, DOI: 10.4236/wsn.2017.92004
Abstract: Reducing number of forwarding nodes is the main focus of any broadcasting algorithm designed for ad-hoc wireless networks. All reliable broadcasting techniques can be broadly classified under proactive and reactive approaches. In proactive approach, a node selects a subset of its neighbors as forwarding node and announces the forwarding node list in the packet header during broadcast. On the other hand, no such forwarding list is generated in reactive approach. Rather, a node (cognitively) determines by itself whether to forward the packet or not based on neighbor information. Dominant pruning and Self-pruning are two example techniques that fall under proactive and reactive approach respectively. Between the two methods, dominant pruning shows better performance than self-pruning in reducing number of forwarding nodes as they work with extended neighbor knowledge. However, appended forwarding node list increases message overhead and consumes more bandwidth. As a result, the approach becomes non-scalable in large networks. In this paper, we propose a reactive broadcasting technique based on self-pruning. The proposed approach dubbed as “Improved Self-pruning based Broadcasting (ISB)” algorithm completes the broadcast with smaller packet header (i.e., with no overhead) but uses extended neighbor knowledge. Simulation results show that ISB outperforms dominant pruning and self-pruning. Furthermore, as the network gets more spread and denser, ISB works remarkably well.
Effects of Systemic Fungicides on Nutritive Composition of Diseased and Healthy Plants of Triticum aestivum L
Zamin Shaheed Siddiqui,Soaliha Ahmed
Pakistan Journal of Biological Sciences , 2000,
Abstract: Application of systematic fungicides showed significance (p<0.001) decrease in total protein and carbohydrates contents of both diseased and healthy plants as compared to control. Diseased plants more adversely affected than healthy. Whereas substantial increase in total phenol was observed in both diseased and healthy plants. Among the amino acid proline, methionine, and tryptophane were founded in appreciable amount in diseased plants.
Effects of Copper and Lead on Germination, Accumulation and Phenolic Contents of Spinancea oleracea and Lycopersicum esculentum
Neelofur Hameed,Zamin Shaheed Siddiqui,Soaliha Ahmed
Pakistan Journal of Biological Sciences , 2001,
Abstract: Effects of copper and lead chloride on germination, accumulation and stress phenolics were studied. Lead chloride significantly reduced the germination, increased accumulation and total phenols in two tested species (S. oleracea and L. esculentum). Maximum inhibition was recorded in plants when treated with 150ppm lead as compared to copper treated sample and control.
Effect of Systemic Fungicides on Germination, Seedling Growth, DNA, RNA and Phenolic Content of Brassica compestris L.
Zamin Shaheed Siddiqui,Soaliha Ahmed,Abid Stress
Pakistan Journal of Biological Sciences , 1999,
Abstract: Application of systemic fungicides viz. benlate and bayleton showed significant decrease in germination as compared to control. Bayleton more adversely affected on shoot growth as compared to root growth while benlate showed greater inhibition in root growth. Total DNA and RNA contents were decreased by the application of systemic fungicides. An increase in total phenolic content was also recorded in test specie.
Effect of Sodium Tri Polyphosphate (STPP) and Foreign Materials on the Quality of Giant Freshwater Prawn (Macrobrachium rosenbergii) under Ice Storage Condition  [PDF]
Sujay Paul, Md. Shaheed Reza, Abu Saim Mahammed Shadat Mandal, Imrul Mosaddek Ahmed, Mohammed Nurul Absar Khan, Md. Nazrul Islam, Md. Kamal
Food and Nutrition Sciences (FNS) , 2012, DOI: 10.4236/fns.2012.31007
Abstract: There are reports on the use of chemicals like sodium tri polyphosphate (STPP) and foreign materials like pearl tapioca (locally called ‘sagu’), jelly (litchi) to adulterate freshwater prawn (Macrobrachium rosenbergii) prior to freeze processing to increase their weight. Studies were, therefore, undertaken to determine the changes in product quality on the use of different concentrations of STPP, sagu and litchi under ice storage condition. Percent weight gain of prawn was 5.46, 18.87 and 23.50 when dipped in 2%, 4% and 6% STPP solution, respectively. In all cases maximum water uptake by prawn muscle was during the first 6 h with fastest weight gain with STPP solutions containing tap water compared to those of ice and tap water. Organoleptic quality of the STPP treated samples became brown and spongy after 8 h of dipping treatment under iced condition. Quality assessment studies conducted after injecting sagu and litchi in prawn muscle showed little or no difference with those of control samples during the first 6 h, which turned whitish and swollen with severe drip loss after 24 h of ice stored condition, indicating characteristics for easy identification of the injected shrimps by organoleptic method.
Botrytis Rot of Tulip bulbs (Tulipa spp.) – A New Record
Indian Phytopathology , 2011,
A Study on Renewable Energy as a Sustainable Alternative for Ensuring Energy Security in Bangladesh and Related Socio-Economic Aspects
Dewan Mowdudur Rahman,Navid Bin Sakhawat,Riasad Amin,Faisal Ahmed
Engineering Journal , 2012, DOI: 10.4186/ej.2012.16.2.47
Abstract: Deficiency in energy sector is a major problem, which can hinder the development workflow of any country. Being the eighth most populated country in the world with a total electricity generation of only about 5000 MW and consumption of 144 kWh per capita, Bangladesh is one of the most electricity-deprived countries around the globe. In addition, absence of adequate investment and mass people awareness is a major problem in this country. Therefore, it would be very difficult to achieve overall progress without ensuring energy security by utilizing the promising renewable energy sources. In order to achieve the Millennium Development Goal (MDG), it is must for a third world country like Bangladesh to address the issue of energy deficiency promptly. In this context, renewable energy is the sustainable solution of energy security as well as social, environmental and economical problems. This paper summarizes the current energy scenario of Bangladesh, impacts of pollution from conventional energy sources, prospects of renewable energy development, and estimates the total investment required in Bangladesh to promote renewable energy sector by the year 2020.
Performance Optimization of a Six-Strand Tundish  [PDF]
Siddharth Gupta, Anupam Dewan
World Journal of Mechanics (WJM) , 2013, DOI: 10.4236/wjm.2013.33018

The aims of the present study are to predict and improve inclusion separation capacity of a six strand tundish by employing flow modifiers (dams and weirs) and to assess the influence of inclusion properties (diameter and density) together with velocity of liquid steel at the inlet gate on the inclusion removal efficiency of a six-strand tundish. Computational solutions of the Reynolds-Averaged Navier-Strokes (RANS) equations together with the energy equation are performed to obtain the steady, three-dimensional velocity and temperature fields using the standard k-ε model of turbulence. These flow fields are then used to predict the inclusion sepapration by numerically solving the inclusion transport equation. To account for the effects of turbulence on particle paths a discrete random walk model is employed. It was observed that with the employment of flow modifiers, the inclusion separation capacity of tundish increases without any large variation in the outlet temperatures. It is shown that inclusion properties and velocity are important parameters in defining the operating conditions of a six-strand tundish.

Rishikesh*, Mohiuddin Ahmed Bhuyian, Irin Dewan, Drishti Rani Ghosh & Md. Asraful Islam
International Journal of Pharmaceutical Sciences and Research , 2013,
Abstract: Tablet is the most popular among all dosage forms existing today because of its convenience of self-administration, compactness and easy manufacturing; however in many cases immediate onset of action is required than conventional therapy. There are novel types of dosage forms that act very quickly after administration. The basic approach used in development tablets is the use of superdisintegrants like Cross linked carboxymelhylcellulose (Crosscarmellose), Sodium starch glycolate (Primogel), Kollidon Cl etc. which provide instant disintegration of tablet after administration. A new dosage form allows a manufacturer to extend market exclusivity, while offering its patient population a more convenient dosage form or dosing regimen. In this regard, immediate release formulations are similar to many sustained release formulations that are now commonly available.
M. Ahmed, S. Koushik Ahamed, Syed Masudur Rahman Dewan, Md. Mizanur Rahman Moghal*
International Journal of Pharmaceutical Sciences and Research , 2013,
Abstract: ABSTRACT: The objective of the current study was to design an oral sustained release matrix tablet of Ramipril and to evaluate the effect of polymer on release pattern of the drug. Tablets were prepared by direct compression method using Methocel (Hydroxy Propyl Methyl Cellulose) K100MCR and Methocel (Hydroxy Propyl Methyl Cellulose) K4MCR, as matrix forming polymer. Dissolution studies were carried out in 500 ml phosphate buffer (pH 6.5) for 8 hours. The release mechanism was explored with zero order, first order, Higuchi equation and Korsmeyer's equation. The drug release followed Higuchi equation. It was found that the release of drug from matrix tablet decrease with the increasing of percentage of polymer. The two high viscosity polymers (Methocel K4MCR and Methocel K100MCR) were found suitable for the study.
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