There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

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Electronic Transport In Mesoscopic Systems

Time-Frequency Analysis.

Antenna Theory And Design

The nephrotic syndrome

Automatic speaker recognition is the use of a machine (i.e. software or hardware) to recognize a person from a spoken phrase. This is done by identifying characteristic acoustic
features of their voice which is unique. This makes it possible to use the speaker's voice to verify their identity and can be used to control access to services such as voice dialing, banking by telephone, database access service, security control for confidential information
area and remote access to computers. Basically prior to a verification or identification session, users that are authorized to use the system will need to undergo enrollment session, where they provide speech samples that will be processed and stored in the database in order
to be used later during the identification process. Here only certain important features that are unique to individuals are extracted while other redundancies are discarded

Speaker recognition using mel frequency cepstrum

An analytical study has been carried out to evaluate the quantitative amount of strain and its distribution in bulk InxGa1–xAs crystals grown by the two-step multi-component zone melting (MCZM) method. With the combination of Raman scattering, photoluminescence and energy dispersive X-ray experiments, it has been confirmed that there exists large amount of strain in bulk InxGa1–xAs crystals grown by the two-step MCZM method due to approximately exponential variation of composition from 0.06 to 0.29 in the first step growth process. Using an axially symmetrical strain model, the quantitative amount of strain and its distribution have been studied for various compositional profiles including the currently used profile. It has been found that the strain and its distribution are strongly dependent on the shape of the compositional profile. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Approach to reduce the residual strain in bulk InGaAs crystals grown by the multi-component zone melting method

Introduction: Persons with SCI experience limitations of activity and inabilities in their early age in comparison with non-injured individual and also experience difficulties in participation in personal and social life. The participation has significant relationship with environment that’s why improving participation in the socio-cultural context can advance their personal satisfaction adequately for people with spinal cord injury. Disability, individual and environmental factors are considered as indicators of participation. Objectives: To explore the perceive impact of environmental barriers on participation of community dwelling individuals with spinal cord injury in Bangladesh. Methodology: A qualitative study design was selected by the researcher to carry out the research. All dimensions of each individual were completed at one theme in time. Data were collected within a short period of time. The target population was the persons with spinal cord injury discharged from a rehabilitation center and living in the community and data collected by purposive sampling. Results: From the transcriptions, researcher identified 15 environmental factors that influenced participation among individuals with SCI. Approximately there are some causes which straightly influence the participation and some causes through others. Conclusion: Participation have to ensure throw ensure accessibility and removing barrier. The participation of persons with disabilities in the formulation and application of public strategy is perceived as indispensable in dropping poverty and confirming their rights. Exclusionary guidelines not only put burden on the country socio-economically, but also create psychological barricades for people with disabilities to explore full potential. 

Influence of Environmental Barrier on Participation Among Persons with Spinal Cord Injury in Bangladesh

Recently, semiconductor photocatalysts for green hydrogen (H2) fuel require two-dimensional (2D) material with semiconducting direct bandgap and enhanced visible light absorptions. In this study, the first-principles calculation of the 2D layered nanostructure of SnGe2N4 is presented for photocatalysis applications, which has a direct bandgap of 1.73 eV/2.64 eV (Perdew–Burke–Ernzerhof/Heyd–Scuseria–Ernzerhof with generalized gradient approximation) with enhanced optical absorptions. The structure is checked to confirm the chemical formidability and dynamical steadiness by formation energy calculations and phonon dispersions. To attain the tunability of electronic and optical properties, biaxial strains, together with tensile and compressive strains, are incorporated, and it is found that compressive strain widens the bandgap, whereas tensile strain causes bandgap reduction. Biaxial strains also improve the optical absorption and the highest absorption coefficient is obtained at ∼1.47 ⨯ 105 cm−1 for 6% compressive strain, comparable to conventional perovskite materials. However, in the visible spectrum, the highest absorption coefficient is obtained for 6% tensile strain. The calculated photocatalytic band edges suggest that this material has sufficient kinetic overpotential for photo redox at compressive strains in both pH = 7 and pH = 0. In addition, the spatial carrier separation is achieved due to having a large intralayer effective potential deviation of ∼6.96 eV, as well as intralayer spatial atomic group contribution in the valance band maximum and conduction band minimum. Conclusively, the analysis in this study can be a theoretical background of this layered nanostructure as a potent photocatalyst for water splitting.

Intralayer spatial carrier separation capability for visible light driven photocatalytic properties of SnGe2N4-layered nanostructure: A first-principles study

The ballistic performance of Si and Ge nanowire (NW) is compared in this study. Current–voltage characteristic is obtained by self-consistently solving the nonequilibrium Green’s function (NEGF) transport equation with Poisson’s equation. The result is obtained at ⟨001⟩ channel orientation. Simulation result shows Ge NW gives higher ON-state current than Si NW, when OFF-state current is made equal by gate metal work function engineering. However, at subthreshold region, performance of NW FET for both material is almost identical. The intravalley and intervalley electron–phonon scattering effect is also calculated using the deformation potential theory and the self-consistent Born approximation. It is found that electron–phonon scattering effect is more pronounced at ON-state of Si NW FET. The ballistic current decreases with the decrease in diameter of the Si NW FET due to electron–phonon scattering.

Md. Rafiqul Islam

Papers

Speaker recognition using mel frequency cepstrum

Approach to reduce the residual strain in bulk InGaAs crystals grown by the multi-component zone melting method

Influence of Environmental Barrier on Participation Among Persons with Spinal Cord Injury in Bangladesh

Intralayer spatial carrier separation capability for visible light driven photocatalytic properties of SnGe2N4-layered nanostructure: A first-principles study

Ballistic Performance Study of Nanowire FET: Effect of Channel Materials and Phonon Scattering