In today's internet era, with the fast progression of digital data exchange in electronic way, securing information has become a challenge. Cryptography plays an important role in information security systems. It is a process of making... more
In today's internet era, with the fast progression of digital data exchange in electronic way, securing information has become a challenge. Cryptography plays an important role in information security systems. It is a process of making information indecipherable to an unauthorized person. There are various cryptographic algorithms that can be used. Although security is important, but on the other side these algorithms consume a significant amount of computing resources such as CPU time, memory and computation time. This paper provides an analysis and comparison of some symmetric key cryptographic ciphers (DES, Triple DES, AES, Blowfish) on the basis of encryption and decryption time with text files and image files using Java as the programming language.
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Abstract It is well known that adaptive beamformers can suffer significant performance degradation when the array response vector for the desired signal is not known exactly. Diagonal loading of the correlation matrix is a popular... more
Abstract It is well known that adaptive beamformers can suffer significant performance degradation when the array response vector for the desired signal is not known exactly. Diagonal loading of the correlation matrix is a popular technique applied to the minimum ...
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ABSTRACT The performances of heterostructural devices are often limited by misfit dislocation. In this paper, a theoretical approach for misfit dislocation reduction of wurtzite InxGa1-xN/GaN is presented. The linear and exponential... more
ABSTRACT The performances of heterostructural devices are often limited by misfit dislocation. In this paper, a theoretical approach for misfit dislocation reduction of wurtzite InxGa1-xN/GaN is presented. The linear and exponential grading techniques have been modeled for the reduction of dislocation. An energy balance model has been taken into consideration and modified for wurtzite structure to evaluate the misfit dislocation density. The value of misfit dislocation has been reduced from 7.112×1010 cm-2 to 6.19×106 cm-2 and 7.039×1010 cm-2 to 6.121×106 cm-2 at the plane 1/3<> {} and 1/3<>{} respectively for linear grading. In case of exponential grading the dislocation density has been reduced to 2.762×105 cm-2 for both slip systems. Because of tapered grading coefficient a tapered dislocation profile has been reported in case of exponential grading technique. Finally, a comparative study has been shown among without graded, linear and exponential grading.
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ABSTRACT Suspended sediment transport and sedimentation dynamics in the sub-tropical Richmond River estuary were investigated between July 1994 and June 1996. During low flow months the estuary received net sediment inputs from the... more
ABSTRACT Suspended sediment transport and sedimentation dynamics in the sub-tropical Richmond River estuary were investigated between July 1994 and June 1996. During low flow months the estuary received net sediment inputs from the continental shelf; during high flow the estuary exported sediment to the continental shelf depending on the magnitude of floods. Flow-weighted sampling along with a one-dimensional unsteady flow hydrodynamic model of the estuary estimated that about fifty percent of the flood-borne suspended sediment was transported through the estuary to the continental shelf during two minor floods (with a 2-year return period), whereas, one hundred percent of the flood-borne sediment was transported to the continental shelf during a moderate flood (with a 5-year return period). Marker horizons confirmed a net accumulation of sediment in the Richmond River estuary at the salt-fresh water interface during all post flood recovery stages.
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Reported herein are measured absolute single, double, and triple charge exchange (CE) cross sections for the highly charged ions (HCIs) Cq+ (q=5,6) , Oq+ (q=6,7,8) , and Neq+ (q=7,8) colliding with the molecular species H2O , CO, and CO2... more
Reported herein are measured absolute single, double, and triple charge exchange (CE) cross sections for the highly charged ions (HCIs) Cq+ (q=5,6) , Oq+ (q=6,7,8) , and Neq+ (q=7,8) colliding with the molecular species H2O , CO, and CO2 . Present data can be applied to interpreting observations of x-ray emissions from comets as they interact with the solar wind. As such, the ion impact energies of 7.0qkeV (1.62-3.06keV/amu) are representative of the fast solar wind, and data at 1.5qkeV for O6+ (0.56keV/amu) on CO and CO2 and 3.5qkeV for O5+ (1.09keV/amu) on CO provide checks of the energy dependence of the cross sections at intermediate and typical slow solar wind velocities. The HCIs are generated within a 14GHz electron cyclotron resonance ion source. Absolute CE measurements are made using a retarding potential energy analyzer, with measurement of the target gas cell pressure and incident and final ion currents. Trends in the cross sections are discussed in light of the classical overbarrier model (OBM), extended OBM, and with recent results of the classical trajectory Monte Carlo theory.
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Abstract] Nitrogen and phosphorus concentrations were measured and exports were calculated in the subtropical Richmond River catchment between July 0883 and June 0885[ A strati_ed sampling approach was adopted owing to the extreme and... more
Abstract] Nitrogen and phosphorus concentrations were measured and exports were calculated in the subtropical Richmond River catchment between July 0883 and June 0885[ A strati_ed sampling approach was adopted owing to the extreme and rapid changes in riverine ...
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ABSTRACT In this paper, lightning induced overvoltage on DC cables of solar power panel, which was laid on the ground and an underground level with proper insulation thickness, was investigated when a lightning strike at a nearby place... more
ABSTRACT In this paper, lightning induced overvoltage on DC cables of solar power panel, which was laid on the ground and an underground level with proper insulation thickness, was investigated when a lightning strike at a nearby place and its proper protection scheme was verified. The result shows that on ground cable voltage is approximately 28.83% more than that of the underground cable having soil resistivity 100Ω-m. Moreover, when soil resistivity increases to 1000Ω-m then the underground cable voltage is less about 48.50% than that of the on ground cable. The induced voltage caused by lightning electromagnetic interference on DC cables of solar power system at power conditioning subsystem (PCS) is analysed using electromagnetic field analysis approach. The FDTD method was applied to calculate induced voltage. Virtual Surge Test Lab (VSTL) is used for FDTD calculations, which solve Maxwell's electromagnetic equations with least approximations. The model of solar power system was represented with thin wires.
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... d. Dr. Abdul Khaleque Beg, FCPS (Anaesthesia), Professor, Department of Anaesthesiology, National Institute of Cardiovascular Diseases, Dhaka, Bangladesh. ... SVo2 (%) 98±1.38 Pco2 (mm Hg) 45±2 MAP (mm Hg) 115±25.2 Heart rate (beats/... more
... d. Dr. Abdul Khaleque Beg, FCPS (Anaesthesia), Professor, Department of Anaesthesiology, National Institute of Cardiovascular Diseases, Dhaka, Bangladesh. ... SVo2 (%) 98±1.38 Pco2 (mm Hg) 45±2 MAP (mm Hg) 115±25.2 Heart rate (beats/ min) 60±10 Epidural Solution(ml ...
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ABSTRACT Offering an alternative reading of the contested nature of access to public resources in Dhaka, this book argues that the contestation of access cannot be explained only by the city’s rapidly growing population; it rather... more
ABSTRACT Offering an alternative reading of the contested nature of access to public resources in Dhaka, this book argues that the contestation of access cannot be explained only by the city’s rapidly growing population; it rather describes it as a product of context-specific structures of power and dependency – "the politics of regulation". This study gives a detailed account of the large diversity of local arrangements and their underlying strategies for negotiation and legitimation in the process of claim making to water supply. It presents constellations of influential actors and their interests and explains how their negotiations in an unbalanced power structure determine the distribution of and access to public water supplies. The author followed an ethnographic research approach and applied a complex and innovative set of qualitative methods for investigation in a low income inner-city squatter area and in a growing peripheral settlement of Dhaka. Frequent participation inadda (casual talks), and personal access to the water supply authority enabled him to observe the routines of everyday life and the complexities of public decision making.
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Agriculture is the mainstay of Bangladesh economy. It plays important role to the growth and development of the economy of the country. Most of the farmers of Bangladesh are marginal and small farmers. They consume most part of their... more
Agriculture is the mainstay of Bangladesh economy. It plays important role to the growth and development of the economy of the country. Most of the farmers of Bangladesh are marginal and small farmers. They consume most part of their produced commodities. The market participation rate of them with surplus production is very low. Therefore, the main objective of the present study is to estimate the level of commercialization of smallholder farmers. The study also examines the welfare outcomes of commercialization of these farmers. This study is mainly based on primary data that are collected from Durgapur Upazila of Rajshahi District of Bangladesh. The required data have been collected from 100 smallholder farmers in the study area. A multi-stage random sampling technique is applied to select the sample farmers. The present study uses household commercialization index to estimate the level of commercialization of smallholder farmers. It also applies one-way ANOVA analysis to examine ...
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This study was undertaken to find out the efficacy of oral premedication with ondansetron to prevent post-operative nausea and vomiting in diagnostic gynaecological laparoscopy assisted surgery and to compare it with metoclopramide. We... more
This study was undertaken to find out the efficacy of oral premedication with ondansetron to prevent post-operative nausea and vomiting in diagnostic gynaecological laparoscopy assisted surgery and to compare it with metoclopramide. We studied fifty patients of ASA physical status I & II, aged between 18-30 years and body weight between 50-60 kgs. The patients were randomized in equal numbers
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A bivariate Type II Gumbel Probability Model belonging to Farlie-Gumbel-Morgenstern family has been proposed and studied. We obtain the distribution of the product of the components, distribution of the ratio of the components and the... more
A bivariate Type II Gumbel Probability Model belonging to Farlie-Gumbel-Morgenstern family has been proposed and studied. We obtain the distribution of the product of the components, distribution of the ratio of the components and the reliability of the model. We also obtain different types of moments.
ABSTRACT This paper presents the process of the translation and instrumentalisation of colonial urban planning principles into contemporary urban planning laws and instruments in Dar es Salaam. Based on a historical reading of the urban... more
ABSTRACT This paper presents the process of the translation and instrumentalisation of colonial urban planning principles into contemporary urban planning laws and instruments in Dar es Salaam. Based on a historical reading of the urban planning institutions and empirical references about current urban planning practices in this city it develops three main claims. First, there is a continuation of colonial planning institutions in the post-colonial Dar es Salaam. The shift of power from the colonial authority to the national state of Tanzania did not greatly impact on the planning institutions and practices in this city. Second, colonial urban planning legacies still dominate the planning institutions and practices in the post-colonial Dar es Salaam, however in different forms. They are now shaped by different sets of actors, follow economic logics, benefit only small groups of the economically privileged at the cost of the majority, and support the accumulation of power of the nation-state authorities. Third, the urban consequences and the urban planning institutions and practices of Dar es Salaam are interrelated; each is a result of the process of translation and instrumentalisation of colonial urban planning principles in the post-colonial setting accompanied by poor management and governance processes as well as the contradictions in the land tenure system that characterise this city. Acknowledging the urban consequences as being conditioned by the intense interplay between planning institutions and practice, and urban management and governance, this paper shows how the continued presence of colonial planning principles in the shaping of post-colonial planning practices may contribute to present-day urban consequences in Dar es Salaam.
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Abstract: Milk production profile in Baghabarighat Milk Shed Area (BMSA) of Bangladesh was studied from July 1991 to June 1996 to identify the development and production pattern of milk throughout the year. Data collected based on active... more
Abstract: Milk production profile in Baghabarighat Milk Shed Area (BMSA) of Bangladesh was studied from July 1991 to June 1996 to identify the development and production pattern of milk throughout the year. Data collected based on active primary society, number of ...