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Search Results: 1 - 10 of 98 matches for " Tahsina Ferdous "
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Social Networks and Social Ties: Changing Trends among Urban Dwellers in Bangladesh  [PDF]
Ahsan Habib, Fahmida Hossain, Tahsina Ferdous, Khalilullah Muhammad Bayezid
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104604
This paper entitled “Social Networks and Social Ties: Changing Trends among Urban Dwellers in Bangladesh” discussed the impact of using social network sites on social ties. The main aim of the article is to reveal how internet and social networking sites reshapes our social relations especially in urban settings. The study followed qualitative way of analyzing social relations and its dynamics. Using empirical data, the article reveals how technological development is changing the contemporary world very rapidly. Changes are taking place in all spheres of life and ultimately these situations change our own society, conventional social thinking patterns and cultural beliefs. The internet is offering new forms of social relations and ties in both private and public sphere through social networking sites like—Facebook, Skype, Twitter, Viber, WeChat, WhatsApp and Imo etc.—that affect the pattern of our day-to-day interaction and relationships within families, communities and society at large. For these changes, human behavior is also changing and therefore, the study is becoming more important in the preset interpersonal relationship. Our contemporary way of living is demanding too much time away from natural social relationships because of technological advancement which is playing a major role for these changes and has a definite consequence on the social and cultural area of Bangladesh.
Heavy Metals, Metalloids, Their Toxic Effect and Living Systems  [PDF]
Ferdous Seraj, Tania Rahman
American Journal of Plant Sciences (AJPS) , 2018, DOI: 10.4236/ajps.2018.913191
Abstract: Pollution of the biosphere by heavy metals is a global hazard that has accelerated since the beginning of the industrial revolution. Toxic heavy metals are harmful to living organisms even at low concentrations whereas heavy metals that are essential trace elements are required by plants at low concentrations but can become toxic at high concentrations. Heavy metals released from different sources accumulate in soil and, where bioavailability is high enough; can adversely affect soil biological functioning and other properties, leading to the loss of soil and ecosystem fertility and health. It is important that heavy metal contaminated sites are remediated as heavy metals do not decompose into less harmful substances like organic contaminants, and thus are retained in the soil. In this review, we survey and analysis our current knowledge and understanding of the abundance of heavy metals in soil, their phytoavailability, their toxicity, their uptake and transport, role of rhizobia and other microbes and overall rhizosphere processes.
Recovery of Image through Alamouti Channel with Incorporation of RSA Algorithm  [PDF]
Aninda Majumder, Mohammad Raihan Ruhin, Tahsina Hashem, Md. Imdadul Islam
Journal of Computer and Communications (JCC) , 2016, DOI: 10.4236/jcc.2016.42001
Abstract: In many applications, it is necessary to transmit images at a remote station, where wired Internet service is not available. In this case, wireless local loop (WLL) can help in making wireless link between one end node of the internet and remote service center. In such link, the communication is heavily affected by large and small scale fading; hence the received signal experiences huge distortion in case of forward error correction. Otherwise, huge service delay arises due to frequent negative acknowledgements. To combat the situation, we can choose Alamouti channel of full rate and fully orthogonal space-time block code (OSTBC). Our aim is to transmit images through Alamouti channel and to observe the quality of the recovered image, in context of bit error rate (BER). We have also observed the impact of fading and additive white Gaussian noise (AWGN) on the image without application of error correction or detection technique of channel coding. To ensure security, we apply the RSA algorithm on each pixel prior transmitting and decrypt them at the receiving end, where we found no impairment from the algorithm. Finally, we observe that the relative performance of the system changes digital modulation schemes.
Available Approaches of Remediation and Stabilisation of Metal Contamination in Soil: A Review  [PDF]
Tania Rahman, Md. Ferdous Seraj
American Journal of Plant Sciences (AJPS) , 2018, DOI: 10.4236/ajps.2018.910148
Abstract: Anthropogenic activities, such as mining of natural resources, manufac-turing industries, modern agricultural practices and energy production have resulted in the release of heavy metals with resultant harmful im-pacts in some natural environments. Toxic heavy metals are harmful to living organisms even at low concentrations. Therefore, heavy metal contaminated sites should be remediated as heavy metals do not decompose into less harmful substances and are retained in the soil. Conventional methods are used for remediation of heavy metal contaminated soils such as heavy metal extraction, immobilization and removal of soils to landfill produce large quantities of toxic products including insoluble hydroxides and are rarely cost effective. The advent of bioremediation technologies like biosparging, bioventing and bioaugmentation has provided an alternative to conventional methods for remediating heavy metal contaminated soils. A subset of bacteria found in the rhizosphere has been found to increase the tolerance of plants to heavy metals in soil. These bacteria commonly known as plant growth promoting rhizobacteria or Plant Growth Promoting Rhizobacteria (PGPR) are showing promise as a bioremediation technique for the stabilisation and remediation of heavy metal contami-nated sites. PGPR can improve plant growth via a variety of mechanism including fixing atmospheric N to improve N status and making plants more tolerant of heavy metals. Scattered literature is harnessed to review the principles, advantages and disadvantages of the available technologies for remediating heavy metal contaminated soils and is presented.
Teager Energy Operation on Wavelet Packet Coefficients for Enhancing Noisy Speech Using a Hard Thresholding Function
Tahsina Farah Sanam,Celia Shahnaz
Signal Processing : An International Journal , 2012,
Abstract: In this paper a new thresholding based speech enhancement approach is presented, where thethreshold is statistically determined by employing the Teager energy operation on the Wavelet Packet(WP) coefficients of noisy speech. The threshold thus obtained is applied on the WP coefficients ofthe noisy speech by using a hard thresholding function in order to obtain an enhanced speech.Detailed simulations are carried out in the presence of white, car, pink, and babble noises to evaluatethe performance of the proposed method. Standard objective measures, spectrogram representationsand subjective listening tests show that the proposed method outperforms the existing state-of-the-artthresholding based speech enhancement approaches for noisy speech from high to low levels ofSNR.
Dissecting Emerging Aspects of Regulatory Circuitry in Man and Mice: Regulatory T Cell Biology  [PDF]
Tania Rahman, Md. Ferdous Seraj, Annelise Casellato
Advances in Bioscience and Biotechnology (ABB) , 2018, DOI: 10.4236/abb.2018.99031
Abstract: Regulatory T cells (Treg), a component of adaptive immunity, are well known for their immunosuppressive roles and their ability to maintain the balance between the immunological and pathological reactions. Treg have been shown to provide protective responses and their depletion has resulted severe pathology in some pathogen infections. The work presented here has unravelled the potential of regulatory cells in the immune system including different repertoir of Treg cell subsets, markers to distinguish them, Treg suppression mechanisms in the pathogenesis of various infections and summarize different mouse models depleting Tregs. These findings would help set up future avenues of research to elucidate a key mechanism of action of these cells and provide new therapeutic insights for pathogenesis and also for broader antibacterial/antiviral/antiproliferative immunity.
Unravelling the Functions of Regulatory T Cells during Infection  [PDF]
Tania Rahman, Md Ferdous Seraj, Annelise Casellato
Open Journal of Medical Microbiology (OJMM) , 2018, DOI: 10.4236/ojmm.2018.84011
Abstract: Accumulating evidences have suggested that Treg have an active role in the regulation of immunity to infection. Treg suppress not only autoimmune responses but also other immune responses for instance, during acute infections, against commensal microbes in inflammatory diseases or during chronic illness. Treg have been shown to limit exacerbated inflammation to avoid collateral tissue damage. Treg are also suggested to provide early protective responses in some viral infections as the permitting timely entry of effector cells in infected tissue. Furthermore, Treg have been shown to contribute to form memory pool after resolution of infection. In this review, we survey and analysis our current knowledge and relative dynamics of Treg in a wide range of infection settings and elaborate the examples in which these cells are of critical importance in conferring tolerance, suppressing pathogenesis, inducing protection and optimizing immunity to eliminate infection.
Lessons from Vibrio Pathogen and the Comparative Study of Vaccines Developed  [PDF]
Tania Rahman, Md Ferdous Seraj, Silvia Buroni
Advances in Microbiology (AiM) , 2018, DOI: 10.4236/aim.2018.812064
Abstract: Cholera continues to be one of the most common causes of morbidity and mortality among children and adults in developing countries. Vaccine against cholera is an approach in the control of this epidemic and pandemic disease. From the development of very early oral cholera vaccine, advances in vaccine development documented due to a good illustration of the epidemiology, outbreak strategy, and pathophysiology of the disease causing pathogen. The newer-generation oral cholera vaccines are safe and guarantee a high level of protection during outbreak settings for several years. Yet infants and young children in developing countries are hyporesponsive to vaccines and show poor protection against cholera. In this review, we survey and analyse our current knowledge on the etiology of cholera, its clinical manifestation, global epidemiology and elaborate the vaccine candidates, which are effective against the pathogen and the corresponding immune responses to the available vaccines. These reviews comprehensively cover the salient features of recent discoveries related to Vibrio cholerae virulence, past and present vaccine candidates and their advantages and disadvantages with their development strategies. We believe that the advances that have been included in this review will give a comprehensive insight to the prevention and control of cholera outbreaks and development of effective cholera vaccines.
Bio-Geo-Chemical Characterization of Bangladeshi Textile Effluents  [PDF]
Farjana Ahmed, Abdul Alim, Fahmida Alam, Tahsina Islam, Ali Azam Talukder
Advances in Microbiology (AiM) , 2015, DOI: 10.4236/aim.2015.55032
Abstract: Recently industrialization has become one of the most promising contributors for economic development of Bangladesh. However, at the same time, industrial pollution has turned into one of the major problems for human being as well as for the environment. In order to understand the effect of textile effluent (TE) on environmental pollution, TE samples collected from North-west part of the capital of Bangladesh, Dhaka (Savar, Ashulia and Tongi area) were characterized biologically, biochemically and biophysically. Eight potential microorganisms were isolated (3 bacteria and 5 fungi) from the collected TE and two of them were used to de-colorization of TE significantly by bioremediation process. Among the various parameters checked here, some physicochemical properties like TDS, COD, BOD, DO and heavy metals like Cd and Cr were detected in quite high amounts. Altogether, our results indicate that TE is one of the serious pollutants, which could damage environment as well as water body severely.
A Comprehensive Analysis of CBCDACP in Wireless Sensor Networks
Jannatul Ferdous,Mst. Jannatul Ferdous,Tanay Dey
Journal of Communications , 2010, DOI: 10.4304/jcm.5.8.627-636
Abstract: As wireless sensor networks are equipped with sensor nodes which have a limited energy and sensing capabilities, a good routing protocol must be designed to make the network energy efficient. In [1] we proposed a centralized routing protocol called Central Base Station Controlled Density Aware Clustering Protocol (CBCDACP) where the base station centrally performs the cluster formation task. In CBCDACP, an optimum set of cluster heads is selected by using a new cluster head selection algorithm focusing on both the density of the sensor nodes and the minimum distances among the cluster head and its neighbor nodes. It calculates the optimum set of cluster head by first selecting the candidate node, then calculating the minimum distance and also calculates the density and finally executing the main BS setup algorithm. In this paper, a comprehensive analysis of CBCDACP algorithm is stated varying the simulation parameters to demonstrate the robustness of this algorithm and explaining the algorithm blocks of CBCDACP. The simulation performance of CBCDACP is then compared with some clustering-based schemes such as Static-Clustering, Low Energy Adaptive Clustering Hierarchy (LEACH), Centralized LEACH (LEACH-C). Simulation results show that CBCDACP can improve system life time and energy efficiency in terms of different simulation performance metrics over its comparatives.
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