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Search Results: 1 - 10 of 513 matches for " Naseem Ghani "
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Redescription of Macrophthalmus (Ventius) latreillei Desmarest, 1822 with a Note on its Identification
Naseem Ghani
Pakistan Journal of Biological Sciences , 2002,
Abstract: The species Macrophthalmus (Ventius) latreillei (Desmarest, 1822) is described from the Northern Arabian Sea. The species is widespread in the Indian Ocean. Where it is probably endemic. It is described and illustrated for the first time from Pakistan.
Crustacean Parasites of Pampus argenteus Euphrasen from Karachi Waters
Naseem Ghani,Qadeer Mohammad Ali
Pakistan Journal of Biological Sciences , 2003,
Sphaeroma walkeri Stebbing, 1905 in the coastal waters of Karachi (Northern Arabian Sea)
Naseem Ghani,Qadeer Mohammad Ali
Journal of Biological Sciences , 2001,
Abstract: Sphaeroma walkeri Stebbing, 1905 is a new record from the northern Arabian sea. A brief description and some illustrations are given.
Visco-Elastic Boundary Layer Flow past a Stretching Plate and Heat Transfer with Variable Thermal Conductivity  [PDF]
Naseem Ahmad
World Journal of Mechanics (WJM) , 2011, DOI: 10.4236/wjm.2011.12003
Abstract: In the present paper, the boundary layer flow of Walters Liquid B Model over a stretching plate has been considered to solve heat flow problem with variable conductivity. First, using similarity transformation, the velocity components of velocity have been obtained. Then, the heat flow problem has been considered in two ways: 1) prescribed surface temperature (PST), and 2) prescribed stretching plate heat flux (PHF) in case of variable conductivity. Due to variable conductivity, temperature profile has its two part- one mean tempera-ture and other temperature profile induced due to variable conductivity. The related results have been dis-cussed with the help of graphs.
Fixed Interest Player v/s Floating Interest Player: Tug of War  [PDF]
Naseem Ahamed
Theoretical Economics Letters (TEL) , 2015, DOI: 10.4236/tel.2015.54055
Abstract: Swaps have been one of the most widely used derivatives since 1970s and for good reasons. Interest rate swap is a mutual agreement between two parties to pay each other the differential amount of up and above the fixed v/s LIBOR. This paper tries to answer the long standing question of what should have been the range around which the fixed rate should have hovered with respect to fluctuating LIBOR over the years to attain break-even and not to be worse off. This paper analyses for the difference in the average LIBOR of various periods (1 month, 3 months, 6 months and 12 months) with respect to different maturity dates (5 years, 10 years, 15 years, 20 years and 23 years). It looks for the presence of structural change in the trend of LIBOR beginning from 1990 to 2013. This paper will draw the attraction of academic as well as market participants. Fixed rate player refers to the party which agrees to pay the existing floating rate (LIBOR) in the market in exchange of an agreed upon fixed rate from the counter party and vice-versa.
Mathematical Modelling for the Diffusional Release of a Dispersed Solute from a Cylindrical Polymer Matrix into Finite External Volume  [PDF]
Thekkethil Shefeeq, Naseem Ahmad
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.31006
Abstract: An exact solution has been obtained for the release kinetics of a solute from a cylindrical non-erodible polymeric matrix into a finite external volume when the initial solute loading is greater than the solubility limit in the matrix. The moving boundary solution is derived based on the combination of variable method. The formulas of the moving boundary and the fractional solute release are given. The moving boundary and the fractional solute release profiles have been calculated at various solute loading levels and different external volumes. The obtained results show that as the external fluid volume increases, the fractional release at any time and the maximum fractional release increase. In addition, for a given external volume, as initial drug loading increases, the fractional release at any time decreases.
On the Performance of ISFET-based Device for Water Quality Monitoring  [PDF]
Pawan Whig, Syed Naseem Ahmad
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2011, DOI: 10.4236/ijcns.2011.411087
Abstract: A new configuration realizing water quality monitoring device using ISFET involving low power CMOS Integrated “Ion Sensitive Field Effect transistor (ISFET) – Operational Amplifier is presented. The study’s main focus is on simulation of power and performance analysis of ISFET device, which is used for water quality monitoring. This approach can improve calibration of device to a fairly wide range without the use of a high speed digital processor. The conventional device has a drawback of slow slew rate but in this novel design, the device has a better slew rate. A new slew rate enhancement (SRE) incorporated into a ISFET, which does not affect the small signal frequency response. The functionality of the circuit is tested using Tanner simulator version 15 for a 70nm CMOS process model also the transfer function realization is done on MATLAB R2011a version, the Very high speed integrated circuit Hardware description language(VHDL) code for the same scheme is simulated on Xilinx ISE 10.1 and various simulation results are obtained. Simulation results are included to demonstrate the results.
Boundary Layer Flow past a Stretching Cylinder and Heat Transfer with Variable Thermal Conductivity  [PDF]
Rekha R. Rangi, Naseem Ahmad
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.33032
Abstract: The boundary layer flow of viscous incompressible fluid over a stretching cylinder has been considered to study flow field and temperature field. Due to non-linearity, a numerical approach called Keller-box technique has been used to compute the values of velocity function f and temperature field at different points of dynamic region. The expressions for skin friction and Nusselt number have also been obtained. The dependence of velocity profile and temperature profile on the dimensionless parameter of practical interest has been analyzed in detail by graphs. The dependence of Skin friction and Nusselt number has been seen through tables.
Realization of a New Current Mode Second-Order Biquad Using Two Current Follower Transconductance Amplifiers (CFTAs)  [PDF]
Nisha Walde, Syed Naseem Ahmad
Circuits and Systems (CS) , 2015, DOI: 10.4236/cs.2015.65012
Abstract: A new circuit for realization of universal current-mode filter using current Follower Transconductance Amplifiers (CFTAs) is presented. The proposed circuit realizes current-mode low pass, high pass and band pass filter functions simultaneously with a single current source at the input. The band reject and all pass filters can also be obtained from the proposed circuit without any extra hardware. The proposed circuit employs three passive grounded elements and two CFTAs. Linear electronic control of natural frequency ω0 is available in the proposed circuit. The quality factor can be independently adjusted through grounded resistor. The proposed circuit employs two grounded capacitors and a grounded resistor along with two CFTAs. The grounded resistor can be replaced by an OTA based circuit for linear electronic control of quality factor Q0. The circuit exhibits low active and passive sensitivities for ω0 and Q0. Simulation results are obtained using PSPICE software which is in conformity with the theoretical findings.
New Voltage Mode Sinusoidal Oscillator Using Voltage Differencing Transconductance Amplifiers (VDTAs)  [PDF]
Nisha Walde, Syed Naseem Ahmad
Circuits and Systems (CS) , 2015, DOI: 10.4236/cs.2015.68018
Abstract: The purpose of this paper is to introduce a new electronically controlled voltage mode sinusoidal oscillator (VMSO) using Voltage Differencing Transconductance Amplifiers (VDTA). The proposed circuit provides electronic control of ω0 and independent condition of oscillation (CO). It is found that the oscillator works very satisfactorily and pure sinusoidal waveforms are available at the outputs. The PSPICE simulation confirms the theoretical results. The proposed oscillator circuit employs only two VDTAs, along with two grounded capacitor and single grounded resistor. The circuit exhibits low active and passive sensitivities for ω0. Simulation results are obtained by using PSPICE software with TSMC CMOS 0.18 um process parameters.
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