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Search Results: 1 - 10 of 713656 matches for " M. A. Baig "
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Diagnostic Study of Nickel Plasma Produced by Fundamental (1064 nm) and Second Harmonics (532 nm) of an Nd: YAG Laser  [PDF]
M. Hanif, M. Salik, M. A. Baig
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.330203
Abstract: In the present work, we have studied the spatial evolution of the nickel alloy plasma produced by the fundamental (1064 nm) and second (532 nm) harmonics of a Q-switched Nd: YAG laser by placing the target material in air at atmospheric pressure. The four Ni I lines at 335.10 nm, 394.61 nm, 481.19 nm and 515.57 nm are used for the determination of electron temperature (Te) using Boltzmann plot method. The electron temperature is calculated as a function of distance from the target surface for both modes of Nd: YAG laser. In case of fundamental (1064 nm) mode of laser, the temperature varies from 13700 - 10270 K as the distance is varied from 0 to 2 mm. Whereas, in the case of second (532 nm) mode of laser it varies from 13270 - 9660 K for the same distance variation. The electron temperature has also been determined by varying the energy of the laser from 90 to 116 mJ, for the fundamental (1064 nm) harmonic and from 58 to 79 mJ for the second (532 nm) harmonics of the laser. The temperature increases from 14192 to 15765 K in the first case and from 13170 to 14800 K for the second case. We have also studied the spatial behavior of the electron number density in the plasma plume. The electron number density (Ne) in the case of fundamental (1064 nm) harmonic of the laser having pulse energy 125 mJ varies from 2.81 × 1016 to 9.81 × 1015 cm-3 at distances of 0 mm to 2.0 mm, whereas, in the case of second (532 nm) harmonic, with pulse energy 75 mJ it varies from 3.67 × 1016 to 1.48 × 1016 cm-3 for the same distance variation by taking Ni I line at 227.20 nm in both the cases.
Cryptanalysis of Keystream Reuse in Stream Ciphered Digitized Speech using HMM based ASR Techniques
L. A. Khan,M.S. Baig
Lecture Notes in Engineering and Computer Science , 2007,
Automated Cryptanalysis of Plaintext XORs of Waveform Encoded Speech
L. A. Khan,M. S. Baig
IAENG International Journal of Computer Science , 2008,
Numerical simulation of random paths with a curvature dependent action
M. Baig,J. Clua,A. Jaramillo
Physics , 1996, DOI: 10.1142/S0217732398002254
Abstract: We study an ensemble of closed random paths, embedded in R^3, with a curvature dependent action. Previous analytical results indicate that there is no crumpling transition for any finite value of the curvature coupling. Nevertheless, in a high statistics numerical simulation, we observe two different regimes for the specific heat separated by a rather smooth structure. The analysis of this fact warns us about the difficulties in the interpretation of numerical results obtained in cases where theoretical results are absent and a high statistics simulation is unreachable. This may be the case of random surfaces.
Development of thermochromic strips as a water pasteurization indicator
Ishtiaq AQazi,MAli Awan,MAnwar Baig,
Ishtiaq A. Qazi
,M. Ali Awan,M. Anwar Baig

环境科学学报(英文版) , 2003,
Abstract: Boiling of water, for purification, commonly practiced in the world, has many problems associated with it like danger of scalding, scaling in the vessels, removal of useful minerals and blandness of taste etc. Water can be made safe for drinking simply by heating at 65 degrees C for 6 minutes. A colour indicating strip was developed which changes colour from red to purple at 67 degrees C. Use of this strip can help in pasteurizing water without the above problems and with considerable energy saving.
Distribution patterns and trophic characteristics of salmonids and native species inhabiting high altitude rivers of Pampa de Achala region, Argentina
Ferriz, Ricardo A.;Baigún, Claudio R. M.;Dominino, Jael;
Neotropical Ichthyology , 2010, DOI: 10.1590/S1679-62252010000400015
Abstract: the pampa de achala in central argentina is an area with low fish species richness where salmonids were first introduced at the beginning of the twentieth century. a total of 19 rivers of different order were sampled during the low water period by using portable electrofishing equipment. we covered different identified macrohabitats (pools, riffles, glides and cascades) in reaches of 300-500 m length. the native species trichomycterus corduvensis and two exotic salmonids such as salvelinus fontinalis and oncorhynchus mykiss represented the most common species, showing allopatric and sympatric distribution in some streams. stomach contents and diet overlapping were also analyzed. cluster results showed a first main group comprised those streams with high diet similitude between t. corduvensis and o. mykiss whereas a second main group consisted of streams with high diet similitude between o. mykiss and s. fontinalis. mean niche width was similar among all these species but t. corduvensis showed that widest range whereas s. fontinalis exhibited the narrowest trophic niche. we were able to document a direct predation on t. corduvensis by o. mykiss in two stream although distribution overlapping among native and exotic species were low. in turn diet overlapping among species were negligible. trophic niche amplitude of s. fontinalis was inversely related to stream order, providing clues that geomorphology and hydrology may exert also influence of trophic characteristics and can be used for predicting the potential for food competition with native species. analysis by tokeshi plot revealed that t. corduvensis ranged from specialist to generalist whereas both salmonids showed generalist feeding habits with a heterogeneous and homogeneous diet.
Finite size analysis of the 3D gonihedric Ising model with k=0
M. Baig,J. Clua,D. A. Johnston,R. Villanova
Physics , 1998,
Abstract: This paper has been withdrawn
Fixed boundary conditions analysis of the 3d Gonihedric Ising model with $κ=0$
M. Baig,J. Clua,D. A. Johnston,R. Villanova
Physics , 2004, DOI: 10.1016/j.physletb.2004.02.002
Abstract: The Gonihedric Ising model is a particular case of the class of models defined by Savvidy and Wegner intended as discrete versions of string theories on cubic lattices. In this paper we perform a high statistics analysis of the phase transition exhibited by the 3d Gonihedric Ising model with $k=0$ in the light of a set of recently stated scaling laws applicable to first order phase transitions with fixed boundary conditions. Even though qualitative evidence was presented in a previous paper to support the existence of a first order phase transition at $k=0$, only now are we capable of pinpointing the transition inverse temperature at $\beta_c = 0.54757(63)$ and of checking the scaling of standard observables.
Collective vs local measurements in qubit mixed state estimation
E. Bagan,M. Baig,R. Munoz-Tapia,A. Rodriguez
Physics , 2003, DOI: 10.1103/PhysRevA.69.010304
Abstract: We discuss the problem of estimating a general (mixed) qubit state. We give the optimal guess that can be inferred from any given set of measurements. For collective measurements and for a large number $N$ of copies, we show that the error in the estimation goes as 1/N. For local measurements we focus on the simpler case of states lying on the equatorial plane of the Bloch sphere. We show that standard tomographic techniques lead to an error proportional to $1/N^{1/4}$, while with our optimal data processing it is proportional to $1/N^{3/4}$.
Optimal reconstruction of a pure qubit state with local measurements
E. Bagan,M. Baig,A. Monras,R. Munoz-Tapia
Physics , 2003,
Abstract: We analyse the reconstruction of an unknown pure qubit state. We derive the optimal guess that can be inferred from any set of measurements on N identical copies of the system with the fidelity as a figure of merit. We study in detail the estimation process with individual von Neumann measurements and demonstrate that they are very competitive as compared to (complicated) collective measurements. We compute the expressions of the fidelity for large $N$ and show that individual measurement schemes can perform optimally in the asymptotic regime.
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