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Search Results: 1 - 10 of 325413 matches for " Naseem S "
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BER Performance of Space-Time Coded MMSE DFE for Wideband Code Division Multiple Access (WCDMA)  [PDF]
Sanjay Kumar SHARMA, S. Naseem AHMAD
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2009, DOI: 10.4236/ijcns.2009.24030
Abstract: In recent times, there has been growing interests in integration of voice, data and video traffic in wireless communication networks. With these growing interests, WCDMA has immerged as an attractive access technique. The performance of WCDMA system is deteriorated in presence of multipath fading environment. The paper presents space-time coded minimum mean square error (MMSE) Decision Feedback Equalizer (DFE) for wideband code division multiple access (WCDMA) in a frequency selective channel. The filter coefficients in MMSE DFE are optimized to suppress noise, intersymbol interference (ISI), and multiple access interference (MAI) with reasonable system complexity. For the above structure, we have presented the estimation of BER for a MMSE DFE using computer simulation experiments. The simulation includes the effects of additive white Gaussian noise, multipath fading and multiple access interference (MAI). Furthermore, the performance is compared with standard linear equalizer (LE) and RAKE receiver. Numerical and simulation results show that the MMSE DFE exhibits significant performance improvement over the standard linear equalizer (LE) and RAKE receiver.
Comparative Immunohistochemical Expression of Chromogranin A and Histidine Decarboxylase in Pulmonary Neuroendocrine Carcinomas
Nadia Naseem,A. H. Nagi,Sobia S. Naseem,Waqas Sami
Turk Toraks Dergisi , 2010,
Abstract: Objective: Neuroendocrine (NE) differentiation has been detected and suggested as an indicator of poor prognosis in a subgroup of a variety of carcinomas, including the pulmonary neuroendocrine carcinomas (PNECs) which express multiple NE cell markers. With the hypothesis that histidine decarboxylase (HDC) and its mechanism of releasing and regulating biogenic amines and peptides, may outline a significant link between NE differentiation of any malignancy, we studied the immunohistochemical expression of this marker, along with chromogranin A (CgA), in various subtypes of PNECs. Material and Method: A cross-sectional descriptive study was carried out comprising 125 patients of PNECs, with the formalin fixed, paraffin embedded tissue blocks which, after H/E staining, were subjected to immunohistochemistry (IHC) with monoclonal anti-HDC and anti CgA antibodies. Positive staining was asserted following the criterion proposed in the previous literature. Results: Our findings of the study revealed that HDC immunostaining in the PNECs demonstrated much better positivity, i-e 88%, as compared to CgA which was positive in only 57.6% cases (P<0.001). The association of positive HDC and CgA immunostaining with the histological grades of PNECSs, showed a notably enhanced positivity by the latter in PD tumours, of which 89.3% were strongly positive as compared to CgA, which was positive in 54.3% cases (P<0.001). Conclusion: HDC may be applied as a reasonably reliable marker for demonstrating NE differentiation in PNECs, regardless of their degree of differentiation as compared to the dependence of CgA positivity on the differentiation of a particular malignancy.
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.
Oral Submucous Fibrosis a Distressing Disease with Malignant Potential
Afroz N,Hasan SA,Naseem S
Indian Journal of Community Medicine , 2006,
Selective Cytotoxic Action and DNA Damage by Calcitriol-Cu(II) Interaction: Putative Mechanism of Cancer Prevention
Asim Rizvi, S. Saif Hasan, Imrana Naseem
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0076191
Abstract: Background Vitamin D is known to play an important role in cancer-prevention. One of the features associated with the onset of malignancy is the elevation of Cu (II) levels. The mode of cancer-prevention mediated by calcitriol, the biologically active form of vitamin D, remain largely unknown. Methods Using exogenously added Cu (II) to stimulate a malignancy like condition in a novel cellular system of rabbit calcitriol overloaded lymphocytes, we assessed lipid peroxidation, protein carbonylation, DNA damage and consequent apoptosis. Free radical mediators were identified using free radical scavengers and the role of Cu (II) in the reaction was elucidated using chelators of redox active cellular metal ions. Results Lipid peroxidation and protein carbonylation (markers of oxidative stress), consequent DNA fragmentation and apoptosis were observed due to calcitriol-Cu (II) interaction. Hydroxyl radicals, hydrogen peroxide and superoxide anions mediate oxidative stress produced during this interaction. Amongst cellular redox active metals, copper was found to be responsible for this reaction. Conclusion This is the first report implicating Cu (II) and calcitriol interaction as the cause of selective cytotoxic action of calcitriol against malignant cells. We show that this interaction leads to the production of oxidative stress due to free radical production and consequent DNA fragmentation, which leads to apoptosis. A putative mechanism is presented to explain this biological effect.
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.
Bacteriological Analysis of Water Collected from Different Dams of Rawalpindi / Islamabad Region in Pakistan
Toqeer Ahmed,Rashida Kanwal,S.S. Tahir,Naseem Rauf
Pakistan Journal of Biological Sciences , 2004,
Abstract: In present study, drinking surface water of different dams, located in Rawalpindi / Islamabad region, was analyzed. Water samples were observed bacteriologically for total viable count and total coliform count by heterotrophic plate count and MPN method. Pathogenic bacteria were isolated from water samples collected from different dams and related filtration plants and identified by different bio-chemical tests. Water samples contain different pathogenic bacteria like Bacillus cereus, E. aerogens, S. aureus, E. coli, Salmonella spp., Shigella spp. and Streptobacillus spp. In all filtration plants, chlorine, a sterilizing agent and the main co-agulant, Alum sulphate, was used. Growth of Coliforms was observed after chlorination in water samples, collected from Rawal dam filtration plant. While no growth of any microorganisms was observed after chlorination in case of Simly dam and Khanpur dam filtration plants but water sample taken from storage of Khanpur filtration plant after filtration and chlorination, was also contaminated. The objective of this study was to check the quality of drinking water and comparative analysis of different dams (Rawal, Simly and Khanpur) and related filtration plants which supplying water for drinking and other purposes to different inhabitants of Rawalpindi and Islamabad after filtration and chlorination.
Incidence of Tuberculosis from Study of Fine-Needle Aspiration Cytology
Ahmad SS,Akhtar S,Akhtar K,Naseem S
Indian Journal of Community Medicine , 2005,
Synthesis of new biologically active compounds containing linked thiazolyl-thiazolidinone heterocycles
Nagaraj Adki,Ravi G,Naseem,Sharath Kumar S
Organic Communications , 2012,
Abstract: A new series of 1,3-benzothiazol-2-yl)-1,3-thiazolan-4-one 5a-j has been synthesized by the reaction of 2-(4-methylphenyl)-3-(5,5,7-trimethyl-4,5,6,7-tetrahydro-1,3-benzothiazol-2-yl)-1,3-thiazolan-4-one 4 with aryl aldehydes. Chemical structures of all the new compounds were established by IR, 1H, 13C NMR, MS and elemental data. The compounds 5a-j were evaluated for their antibacterial activity against Gram-positive bacteria viz. Bacillus subtilis (MTCC 441), Bacillus sphaericus (MTCC 11), Staphylococcus aureus (MTCC 96) and Gram-negative bacteria viz. Pseudomonas aeruginosa (MTCC 741), Klebsiella aerogenes (MTCC 39), Chromobacterium violaceum (MTCC 2656). Amongst them, compounds containing [(4-chlorophenyl)methyli- dene] moiety 5b, [(3-nitrophenyl)methylidene] moiety 5d and [(2-thienyl)methylidene] moiety 5j showed significant antibacterial activity, almost equal/more than the activity of the standard drug Streptomycin. Further, the compounds 5a-j were also screened for their antifungal activity against Candida albicans (ATCC 10231), Aspergillus fumigatus (HIC 6094), Trichophyton rubrum (IFO 9185), and Trichophyton mentagrophytes (IFO 40996). Most of these new compounds showed appreciable activity against test bacteria and fungi and emerged as potential molecules for further development.
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